10-K

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-K

ANNUAL REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE

SECURITIES EXCHANGE ACT OF 1934

For the Fiscal Year Ended December 31, 2017 — Commission File No. 0-2989

COMMERCE BANCSHARES, INC.

(Exact name of registrant as specified in its charter)

Missouri	43-0889454
(State of Incorporation)	(IRS Employer Identification No.)
1000 Walnut,
Kansas City, MO	64106 (Zip Code)
(Address of principal executive offices)	(Zip Code)
(816) 234-2000
(Registrant’s telephone number, including area code)

Securities registered pursuant to Section 12(b) of the Act:
Title of class	Name of exchange on which registered
$5 Par Value Common Stock	NASDAQ Global Select Market
Depositary Shares, each representing a 1/1000th interest in a share of 6.0% Series B Non-Cumulative Perpetual Preferred Stock	NASDAQ Global Select Market
Securities registered pursuant to Section 12(g) of the Act:

NONE

Indicate by check mark if the Registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act. Yes þNo o

Indicate by check mark if the Registrant is not required to file reports pursuant to Section 13 or 15(d) of the Act. Yes oNo þ

Indicate by check mark whether the Registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the Registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days. Yes þ No o

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files). Yes þ No o

Indicate by check mark if disclosure of delinquent filers pursuant to Item 405 of Regulation S-K (§229.405 of this chapter) is not contained herein, and will not be contained, to the best of Registrant’s knowledge, in definitive proxy or information statements incorporated by reference in Part III of this Form 10-K or any amendment to this Form 10-K. o

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, smaller reporting company, or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company,” and "emerging growth company" in Rule 12b-2 of the Exchange Act. (Check one):

Large accelerated filer þ	Accelerated filer o	Non-accelerated filer o	Smaller reporting company o	Emerging growth company o
		(Do not check if a smaller reporting company)

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. o

Indicate by check mark whether the Registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act). Yes o No þ

As of June 30, 2017, the aggregate market value of the voting stock held by non-affiliates of the Registrant was approximately $5,271,000,000.

As of February 9, 2018, there were 106,710,134 shares of Registrant’s $5 Par Value Common Stock outstanding.

DOCUMENTS INCORPORATED BY REFERENCE

Portions of the Registrant’s definitive proxy statement for its 2018 annual meeting of shareholders, which will be filed within 120 days of December 31, 2017, are incorporated by reference into Part III of this Report.

Commerce Bancshares, Inc.
Form 10-K
INDEX			Page
PART I	Item 1.	Business	3
	Item 1a.	Risk Factors	8
	Item 1b.	Unresolved Staff Comments	12
	Item 2.	Properties	12
	Item 3.	Legal Proceedings	12
	Item 4.	Mine Safety Disclosures	12
PART II	Item 5.	Market for Registrant’s Common Equity, Related Stockholder Matters and Issuer Purchases of Equity Securities	14
	Item 6.	Selected Financial Data	15
	Item 7.	Management’s Discussion and Analysis of Financial Condition and Results of Operations	16
	Item 7a.	Quantitative and Qualitative Disclosures about Market Risk	60
	Item 8.	Financial Statements and Supplementary Data	60
	Item 9.	Changes in and Disagreements with Accountants on Accounting and Financial Disclosure	119
	Item 9a.	Controls and Procedures	119
	Item 9b.	Other Information	121
PART III	Item 10.	Directors, Executive Officers and Corporate Governance	121
	Item 11.	Executive Compensation	121
	Item 12.	Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters	121
	Item 13.	Certain Relationships and Related Transactions, and Director Independence	121
	Item 14.	Principal Accounting Fees and Services	121
PART IV	Item 15.	Exhibits and Financial Statement Schedules	122
	Item 16.	Form 10-K Summary	123
Signatures			124

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PART I

Item 1. BUSINESS

General

Commerce Bancshares, Inc., a bank holding company as defined in the Bank Holding Company Act of 1956, as amended, was incorporated under the laws of Missouri on August 4, 1966. Through a second tier wholly-owned bank holding company, it owns all of the outstanding capital stock of Commerce Bank (the “Bank”), which is headquartered in Missouri. The Bank engages in general banking business, providing a broad range of retail, mortgage banking, corporate, investment, trust, and asset management products and services to individuals and businesses. Commerce Bancshares, Inc. also owns, directly or through the Bank, various non-banking subsidiaries. Their activities include private equity investment, securities brokerage, insurance agency, and leasing activities. A list of Commerce Bancshares, Inc.'s subsidiaries is included as Exhibit 21.

Commerce Bancshares, Inc. and its subsidiaries (collectively, the "Company") is one of the nation’s top 50 bank holding companies, based on asset size. At December 31, 2017, the Company had consolidated assets of $24.8 billion, loans of $14.0 billion, deposits of $20.4 billion, and equity of $2.7 billion. All of the Company’s operations conducted by its subsidiaries are consolidated for purposes of preparing the Company’s consolidated financial statements. The Company's principal markets, which are served by 176 branch facilities, are located throughout Missouri, Kansas, and central Illinois, as well as Tulsa and Oklahoma City, Oklahoma and Denver, Colorado. Its two largest markets include St. Louis and Kansas City, which serve as the central hubs for the entire Company. The Company also has commercial loan production offices in Dallas, Nashville, Cincinnati, Des Moines, Grand Rapids, and Indianapolis, and operates a national payments business with sales representatives covering 48 states.

The Company’s goal is to be the preferred provider of targeted financial services in its communities, based on strong customer relationships. It believes in building long-term relationships based on top quality service, a strong risk management culture, and a strong balance sheet with industry-leading capital levels. The Company operates under a super-community banking format which incorporates large bank product offerings coupled with deep local market knowledge, augmented by experienced, centralized support in select critical areas. The Company’s focus on local markets is supported by an experienced team of managers assigned to each market and is also reflected in its financial centers and regional advisory boards, which are comprised of local business persons, professionals and other community representatives, who assist the Company in responding to local banking needs. In addition to this local market, community-based focus, the Company offers sophisticated financial products available at much larger financial institutions.

The markets the Bank serves, being mainly located in the lower Midwest, provide natural sites for production and distribution facilities and also serve as transportation hubs. The economy has been well-diversified in these markets with many major industries represented, including telecommunications, automobile, technology, financial services, aircraft and general manufacturing, health care, numerous service industries, and food and agricultural production. The real estate lending operations of the Bank are centered in its lower Midwestern markets. Historically, these markets have tended to be less volatile than in other parts of the country. Management believes the diversity and nature of the Bank’s markets has a mitigating effect on real estate loan losses in these markets.

From time to time, the Company evaluates the potential acquisition of various financial institutions. In addition, the Company regularly considers the potential disposition of certain assets and branches. The Company seeks merger or acquisition partners that are culturally similar, have experienced management and either possess significant market presence or have potential for improved profitability through financial management, economies of scale and expanded services. The Company has not completed any significant transactions or sales during the past several years.

Employees

The Company employed 4,502 persons on a full-time basis and 355 persons on a part-time basis at December 31, 2017. The Company provides a variety of benefit programs including a 401(k) savings plan with a company matching contribution, as well as group life, health, accident, and other insurance. The Company also maintains training and educational programs designed to address the significant and changing regulations facing the financial services industry and prepare employees for positions of increasing responsibility. None of the Company's employees are represented by collective bargaining agreements.

Competition

The Company faces intense competition from hundreds of financial service providers in its markets and around the United States. It competes with national and state banks for deposits, loans and trust accounts, and with savings and loan associations and credit unions for deposits and consumer lending products. In addition, the Company competes with other financial intermediaries such as securities brokers and dealers, personal loan companies, insurance companies, finance companies, and

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certain governmental agencies. Some of these competitors are not subject to the same regulatory restrictions as domestic banks and bank holding companies. The Company generally competes by providing sophisticated financial products with a strong commitment to customer service, convenience of locations, reputation, and price of service, including interest rates on loan and deposit products. In its two largest markets, the Company has approximately 13% of the deposit market share in Kansas City and approximately 7% of the deposit market share in St. Louis.

Operating Segments

The Company is managed in three operating segments. The Consumer segment includes the retail branch network, consumer installment lending, personal mortgage banking, and consumer debit and credit bank card activities. It provides services through a network of 176 full-service branches, a widespread ATM network of 376 machines, and the use of alternative delivery channels such as extensive online banking, mobile, and telephone banking services. In 2017, this retail segment contributed 21% of total segment pre-tax income. The Commercial segment provides a full array of corporate lending, merchant and commercial bank card products, leasing, and international services, as well as business and government deposit and cash management services. Fixed-income investments are sold to individuals and institutional investors through the Capital Markets Group, which is also included in this segment. In 2017, the Commercial segment contributed 58% of total segment pre-tax income. The Wealth segment provides traditional trust and estate planning services, brokerage services, and advisory and discretionary investment portfolio management services to both personal and institutional corporate customers and contributed 21% of total segment 2017 pre-tax income. At December 31, 2017, the Trust group managed investments with a market value of $30.0 billion and administered an additional $18.8 billion in non-managed assets. This segment also manages the Company’s family of proprietary mutual funds, which are available for sale to both trust and general retail customers. Additional information relating to operating segments can be found on pages 48 and 95.

Government Policies

The Company's operations are affected by federal and state legislative changes, by the United States government, and by policies of various regulatory authorities, including those of the numerous states in which they operate. These include, for example, the statutory minimum legal lending rates, domestic monetary policies of the Board of Governors of the Federal Reserve System, United States fiscal policy, international currency regulations and monetary policies, the U.S. Patriot Act, and capital adequacy and liquidity constraints imposed by federal and state bank regulatory agencies.

Supervision and Regulation

The following information summarizes existing laws and regulations that materially affect the Company's operations. It does not discuss all provisions of these laws and regulations, and it does not include all laws and regulations that affect the Company presently or may affect the Company in the future.

General

The Company, as a bank holding company, is primarily regulated by the Board of Governors of the Federal Reserve System under the Bank Holding Company Act of 1956, as amended (BHC Act). Under the BHC Act, the Federal Reserve Board’s prior approval is required in any case in which the Company proposes to acquire all or substantially all of the assets of any bank, acquire direct or indirect ownership or control of more than 5% of the voting shares of any bank, or merge or consolidate with any other bank holding company. With certain exceptions, the BHC Act also prohibits the Company from acquiring direct or indirect ownership or control of more than 5% of any class of voting shares of any non-banking company. Under the BHC Act, the Company may not engage in any business other than managing and controlling banks or furnishing certain specified services to subsidiaries and may not acquire voting control of non-banking companies unless the Federal Reserve Board determines such businesses and services to be closely related to banking. When reviewing bank acquisition applications for approval, the Federal Reserve Board considers, among other things, the Bank’s record in meeting the credit needs of the communities it serves in accordance with the Community Reinvestment Act of 1977, as amended (CRA). Under the terms of the CRA, banks have a continuing obligation, consistent with safe and sound operation, to help meet the credit needs of their communities, including providing credit to individuals residing in low- and moderate-income areas. The Bank has a current CRA rating of “outstanding”.

The Company is required to file with the Federal Reserve Board various reports and additional information the Federal Reserve Board may require. The Federal Reserve Board also makes regular examinations of the Company and its subsidiaries. The Company’s banking subsidiary is a state chartered Federal Reserve member bank and is subject to regulation, supervision and examination by the Federal Reserve Bank of Kansas City and the State of Missouri Division of Finance. The Bank is also subject to regulation by the Federal Deposit Insurance Corporation (FDIC). In addition, there are numerous other federal and state laws and regulations which control the activities of the Company and the Bank, including requirements and limitations relating to capital and reserve requirements, permissible investments and lines of business, transactions with affiliates, loan limits, mergers and acquisitions, issuance of securities, dividend payments, and extensions of credit. The Bank is subject to a number of federal and

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state consumer protection laws, including laws designed to protect customers and promote lending to various sectors of the economy and population. These laws include the Equal Credit Opportunity Act, the Fair Credit Reporting Act, the Truth in Lending Act, the Home Mortgage Disclosure Act, the Real Estate Settlement Procedures Act, and their respective state law counterparts. If the Company fails to comply with these or other applicable laws and regulations, it may be subject to civil monetary penalties, imposition of cease and desist orders or other written directives, removal of management and, in certain circumstances, criminal penalties. This regulatory framework is intended primarily for the protection of depositors and the preservation of the federal deposit insurance funds, not for the protection of security holders. Statutory and regulatory controls increase a bank holding company’s cost of doing business and limit the options of its management to employ assets and maximize income.

In addition to its regulatory powers, the Federal Reserve Bank affects the conditions under which the Company operates by its influence over the national supply of bank credit. The Federal Reserve Board employs open market operations in U.S. government securities and oversees changes in the discount rate on bank borrowings, changes in the federal funds rate on overnight inter-bank borrowings, and changes in reserve requirements on bank deposits in implementing its monetary policy objectives. These methods are used in varying combinations to influence the overall level of the interest rates charged on loans and paid for deposits, the price of the dollar in foreign exchange markets, and the level of inflation. The monetary policies of the Federal Reserve have a significant effect on the operating results of financial institutions, most notably on the interest rate environment. In view of changing conditions in the national economy and in the money markets, as well as the effect of credit policies of monetary and fiscal authorities, no prediction can be made as to possible future changes in interest rates, deposit levels or loan demand, or their effect on the financial statements of the Company.

The financial industry operates under laws and regulations that are under constant review by various agencies and legislatures and are subject to sweeping change. The Company currently operates as a bank holding company, as defined by the Gramm-Leach-Bliley Financial Modernization Act of 1999 (GLB Act), and the Bank qualifies as a financial subsidiary under the GLB Act, which allows it to engage in investment banking, insurance agency, brokerage, and underwriting activities that were not available to banks prior to the GLB Act. The GLB Act also included privacy provisions that limit banks’ abilities to disclose non-public information about customers to non-affiliated entities.

The Company must also comply with the requirements of the Bank Secrecy Act (BSA). The BSA is designed to help fight drug trafficking, money laundering, and other crimes. Compliance is monitored by the Federal Reserve. The BSA was enacted to prevent banks and other financial service providers from being used as intermediaries for, or to hide the transfer or deposit of money derived from, criminal activity. Since its passage, the BSA has been amended several times. These amendments include the Money Laundering Control Act of 1986 which made money laundering a criminal act, as well as the Money Laundering Suppression Act of 1994 which required regulators to develop enhanced examination procedures and increased examiner training to improve the identification of money laundering schemes in financial institutions.

The USA PATRIOT Act, established in 2001, substantially broadened the scope of U.S. anti-money laundering laws and regulations by imposing significant new compliance and due diligence obligations, creating new crimes and penalties and expanding the extra-territorial jurisdiction of the United States. The regulations impose obligations on financial institutions to maintain appropriate policies, procedures and controls to detect, prevent, and report money laundering and terrorist financing. The regulations include significant penalties for non-compliance.

The Dodd-Frank Wall Street Reform and Consumer Protection Act of 2011 (Dodd-Frank Act) was sweeping legislation intended to overhaul regulation of the financial services industry. Among its many provisions, the Dodd-Frank Act established a new council of “systemic risk” regulators, empowers the Federal Reserve to supervise the largest, most complex financial companies, allows the government to seize and liquidate failing financial companies, and gives regulators new powers to oversee the derivatives market. The Dodd-Frank Act also established the Consumer Financial Protection Bureau (CFPB) and authorized it to supervise certain consumer financial services companies and large depository institutions and their affiliates for consumer protection purposes. Subject to the provisions of the Dodd-Frank Act, the CFPB has responsibility to implement, examine for compliance with, and enforce “Federal consumer financial law.” As a depository institution, the Company is subject to examinations by the CFPB, which focus on the Company’s ability to detect, prevent, and correct practices that present a significant risk of violating the law and causing consumer harm. Title VI of the Dodd-Frank Act, commonly known as the Volcker Rule, placed trading restrictions on financial institutions and separated investment banking, private equity and proprietary trading (hedge fund) sections of financial institutions from their consumer lending arms. Key provisions restrict banks from simultaneously entering into advisory and creditor roles with their clients, such as with private equity firms. The Volcker Rule also restricts financial institutions from investing in and sponsoring certain types of investments, and required divestment by July 21, 2017. In 2016, the Company withdrew from a private equity fund investment to comply with the Volcker Rule requirement and realized a gain of $1.8 million upon divestiture. The Company did not hold other significant investments requiring disposal.

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While the Company remains subject to regulation under the Dodd-Frank Act and related regulatory requirements, the current presidential administration has instructed federal agencies to consider ways to reduce the impact of federal regulation on financial institutions. It is not possible at this time to determine the extent to which this goal will be accomplished nor its impact on the Company.

Subsidiary Bank

Under Federal Reserve policy, the bank holding company, Commerce Bancshares, Inc. (the "Parent"), is expected to act as a source of financial strength to its bank subsidiary and to commit resources to support it in circumstances when it might not otherwise do so. In addition, loans by a bank holding company to any of its subsidiary banks are subordinate in right of payment to deposits and to certain other indebtedness of such subsidiary banks. In the event of a bank holding company’s bankruptcy, any commitment by the bank holding company to a federal bank regulatory agency to maintain the capital of a subsidiary bank will be assumed by the bankruptcy trustee and entitled to a priority of payment.

Deposit Insurance

Substantially all of the deposits of the Bank are insured up to the applicable limits by the Deposit Insurance Fund of the FDIC, generally up to $250,000 per depositor, for each account ownership category. The Bank pays deposit insurance premiums to the FDIC based on an assessment rate established by the FDIC for Deposit Insurance Fund member institutions. The FDIC classifies institutions under a risk-based assessment system based on their perceived risk to the federal deposit insurance funds. The current assessment base is defined as average total assets minus average tangible equity, with other adjustments for heavy use of unsecured liabilities, secured liabilities, brokered deposits, and holdings of unsecured bank debt. For banks with more than $10 billion in assets, the FDIC uses a scorecard designed to measure financial performance and ability to withstand stress, in addition to measuring the FDIC’s exposure should the bank fail. FDIC insurance expense also includes assessments to fund the interest on outstanding bonds issued in the 1980s in connection with the failures in the thrift industry. The Company's FDIC insurance expense was $14.0 million in 2017, $13.3 million in 2016, and $12.1 million in 2015.

Payment of Dividends

The Federal Reserve Board may prohibit the payment of cash dividends to shareholders by bank holding companies if their actions constitute unsafe or unsound practices. The principal source of the Parent's cash revenues is cash dividends paid by the Bank. The amount of dividends paid by the Bank in any calendar year is limited to the net profit of the current year combined with the retained net profits of the preceding two years, and permission must be obtained from the Federal Reserve Board for dividends exceeding these amounts. The payment of dividends by the Bank may also be affected by factors such as the maintenance of adequate capital.

Capital Adequacy

The Company is required to comply with the capital adequacy standards established by the Federal Reserve, which are based on the risk levels of assets and off-balance sheet financial instruments. Capital adequacy guidelines and prompt corrective action regulations involve quantitative measures of assets, liabilities, and certain off-balance sheet items calculated under regulatory accounting practices. Capital amounts and classifications are also subject to judgments by regulators regarding qualitative components, risk weightings, and other factors.

A new comprehensive capital framework was established by the Basel Committee on Banking Supervision, which was effective for banks and bank holding companies on January 1, 2015. A key goal of the new framework, known as "Basel III" was to strengthen the capital resources of banking organizations during normal and challenging business environments. Basel III increased minimum requirements for both the quantity and quality of capital held by banking organizations. The rule includes a new minimum ratio of common equity Tier 1 capital to risk-weighted assets of 4.5% and a common equity Tier 1 capital conservation buffer of 2.5% of risk-weighted assets. The capital conservation buffer, which is being phased in during 2016-2019, is intended to absorb losses during periods of economic stress. Failure to maintain the buffer will result in constraints on dividends, equity repurchases and executive compensation. The rule also adjusted the methodology for calculating risk-weighted assets to enhance risk sensitivity. At December 31, 2017, the Company met all capital adequacy requirements under Basel III on a fully phased-in basis as if such requirements had been in effect.

The Federal Deposit Insurance Corporation Improvement Act (FDICIA) requires each federal banking agency to take prompt corrective action to resolve the problems of insured depository institutions, including but not limited to those that fall below one or more prescribed minimum capital ratios. Pursuant to FDICIA, the FDIC promulgated regulations defining the following five categories in which an insured depository institution will be placed, based on the level of its capital ratios: well-capitalized, adequately capitalized, undercapitalized, significantly undercapitalized, and critically undercapitalized. Under the prompt

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corrective action provisions of FDICIA, an insured depository institution generally will be classified as well-capitalized (under the Basel III rules mentioned above) if it has a Tier 1 capital ratio of at least 8%, a common equity Tier 1 capital ratio of at least 6.5%, a Total capital ratio of at least 10% and a Tier 1 leverage ratio of at least 5%. An institution that, based upon its capital levels, is classified as “well-capitalized,” “adequately capitalized,” or “undercapitalized,” may be treated as though it were in the next lower capital category if the appropriate federal banking agency, after notice and opportunity for hearing, determines that an unsafe or unsound condition or an unsafe or unsound practice warrants such treatment. At each successive lower capital category, an insured depository institution is subject to more restrictions and prohibitions, including restrictions on growth, restrictions on interest rates paid on deposits, restrictions or prohibitions on payment of dividends and restrictions on the acceptance of brokered deposits. Furthermore, if a bank is classified in one of the undercapitalized categories, it is required to submit a capital restoration plan to the federal bank regulator, and the holding company must guarantee the performance of that plan. The Bank has consistently maintained regulatory capital ratios at or above the “well-capitalized” standards.

Stress Testing

As required by the Dodd-Frank Act, the Federal Reserve published capital stress testing regulations applicable to certain financial companies with total consolidated assets of more than $10 billion but less than $50 billion. The rule requires that these financial companies, including the Company, conduct annual stress tests based on factors provided by the Federal Reserve, supplemented by institution-specific factors. The stress test is designed to assess the potential impact of different economic scenarios on earnings, credit losses and capital over a set time period. In accordance with the Dodd-Frank Act, the Company began submitting its stress test results to the Federal Reserve in March 2014 and publicly disclosed the results of its stress testing for the first time in June 2015. In 2017, the Company submitted its stress test report to the Federal Reserve in July and publicly disclosed the results in October.

Executive and Incentive Compensation

Guidelines adopted by federal banking agencies prohibit excessive compensation as an unsafe and unsound practice and describe compensation as excessive when the amounts paid are unreasonable or disproportionate to the services performed by an executive officer, employee, director or principal shareholder. The Federal Reserve Board has issued comprehensive guidance on incentive compensation intended to ensure that the incentive compensation policies do not undermine safety and soundness by encouraging excessive risk taking. This guidance covers all employees that have the ability to materially affect the risk profile of an organization, either individually or as part of a group, based on key principles that (i) incentives do not encourage risk-taking beyond the organization's ability to identify and manage risk, (ii) compensation arrangements are compatible with effective internal controls and risk management, and (iii) compensation arrangements are supported by strong corporate governance, including active and effective board oversight. Deficiencies in compensation practices may affect supervisory ratings and enforcement actions may be taken if incentive compensation arrangements pose a risk to safety and soundness.

Transactions with Affiliates

The Federal Reserve Board regulates transactions between the Company and its subsidiaries. Generally, the Federal Reserve Act and Regulation W, as amended by the Dodd-Frank Act, limit the Company’s banking subsidiary and its subsidiaries to lending and other “covered transactions” with affiliates. The aggregate amount of covered transactions a banking subsidiary or its subsidiaries may enter into with an affiliate may not exceed 10% of the capital stock and surplus of the banking subsidiary. The aggregate amount of covered transactions with all affiliates may not exceed 20% of the capital stock and surplus of the banking subsidiary.

Covered transactions with affiliates are also subject to collateralization requirements and must be conducted on arm’s length terms. Covered transactions include (a) a loan or extension of credit by the banking subsidiary, including derivative contracts, (b) a purchase of securities issued to a banking subsidiary, (c) a purchase of assets by the banking subsidiary unless otherwise exempted by the Federal Reserve, (d) acceptance of securities issued by an affiliate to the banking subsidiary as collateral for a loan, and (e) the issuance of a guarantee, acceptance or letter of credit by the banking subsidiary on behalf of an affiliate.

Certain transactions with our directors, officers or controlling persons are also subject to conflicts of interest regulations. Among other things, these regulations require that loans to such persons and their related interests be made on terms substantially the same as for loans to unaffiliated individuals and must not create an abnormal risk of repayment or other unfavorable features for the financial institution. See Note 2 to the consolidated financial statements for additional information on loans to related parties.

Available Information

The Company’s principal offices are located at 1000 Walnut, Kansas City, Missouri (telephone number 816-234-2000). The Company makes available free of charge, through its Web site at www.commercebank.com, reports filed with the Securities and

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Exchange Commission as soon as reasonably practicable after the electronic filing. These filings include the annual report on Form 10-K, quarterly reports on Form 10-Q, current reports on Form 8-K, and all amendments to those reports.

Statistical Disclosure

The information required by Securities Act Guide 3 — “Statistical Disclosure by Bank Holding Companies” is located on the pages noted below.

		Page
I.	Distribution of Assets, Liabilities and Stockholders’ Equity; Interest Rates and Interest Differential	22, 56-59
II.	Investment Portfolio	39-40, 80-84
III.	Loan Portfolio
	Types of Loans	28
	Maturities and Sensitivities of Loans to Changes in Interest Rates	29
	Risk Elements	34-38
IV.	Summary of Loan Loss Experience	31-34
V.	Deposits	56, 86
VI.	Return on Equity and Assets	17
VII.	Short-Term Borrowings	86

Item 1a. RISK FACTORS

Making or continuing an investment in securities issued by Commerce Bancshares, Inc., including its common and preferred stock, involves certain risks that you should carefully consider. If any of the following risks actually occur, its business, financial condition or results of operations could be negatively affected, the market price for your securities could decline, and you could lose all or a part of your investment. Further, to the extent that any of the information contained in this Annual Report on Form 10-K constitutes forward-looking statements, the risk factors set forth below also are cautionary statements identifying important factors that could cause the Company’s actual results to differ materially from those expressed in any forward-looking statements made by or on behalf of Commerce Bancshares, Inc.

Difficult market conditions may affect the Company’s industry.

The concentration of the Company’s banking business in the United States particularly exposes it to downturns in the U.S. economy. While current economic conditions are favorable, there remain risks in that environment.

In particular, the Company may face the following risks in connection with market conditions:     

• In the current national environment, positive trends in job growth, unemployment levels, consumer confidence, and credit conditions are expected to continue. However, the U.S. economy is also affected by foreign economic events and conditions. Although the Company does not hold foreign debt, the global economy, the strength of the U.S. dollar, and oil prices may ultimately affect interest rates, business export activity, capital expenditures by businesses, and investor confidence. Unfavorable changes in these factors may result in declines in consumer credit usage, adverse changes in payment patterns, reduced loan demand, and higher loan delinquencies and default rates. These could impact the Company’s future loan losses and provision for loan losses, as a significant part of the Company’s business includes consumer and credit card lending.

• In addition to the results above, reduced levels of economic activity may cause declines in financial services activity, including declines in bank card, corporate cash management and other fee businesses, as well as the fees earned by the Company on such transactions.

• The process used to estimate losses inherent in the Company’s loan portfolio requires difficult, subjective, and complex judgments, including forecasts of economic conditions and how these economic predictions might impair the ability of its borrowers to repay their loans. If an instance occurs that renders these predictions no longer capable of accurate estimation, this may in turn impact the reliability of the process.

• Competition in the industry could intensify as a result of the increasing consolidation of financial services companies in connection with current market conditions, thereby reducing market prices for various products and services which could in turn reduce Company revenues.

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The performance of the Company is dependent on the economic conditions of the markets in which the Company operates.

The Company’s success is heavily influenced by the general economic conditions of the specific markets in which it operates. Unlike larger national or other regional banks that are more geographically diversified, the Company provides financial services primarily throughout the states of Missouri, Kansas, and central Illinois, and in its expansion markets in Oklahoma, Colorado and other surrounding states. As the Company does not have a significant banking presence in other parts of the country, a prolonged economic downturn in these markets could have a material adverse effect on the Company’s financial condition and results of operations.

The Company operates in a highly competitive industry and market area.

The Company operates in the financial services industry and has numerous competitors including other banks and insurance companies, securities dealers, brokers, trust and investment companies and mortgage bankers. Consolidation among financial service providers and new changes in technology, product offerings and regulation continue to challenge the Company's marketplace position. As consolidation occurs, larger regional and national banks may enter our markets and add to existing competition. Large national financial institutions have substantial capital, technology and marketing resources. These new banks may lower fees in an effort to grow market share, which could result in a loss of customers and lower fee revenue for the Company. They may have greater access to capital at a lower cost than the Company, which may adversely affect the Company’s ability to compete effectively. The Company must continue to make investments in its products and delivery systems to stay competitive with the industry as a whole, or its financial performance may suffer.

The soundness of other financial institutions could adversely affect the Company.

The Company’s ability to engage in routine funding transactions could be adversely affected by the actions and commercial soundness of other financial institution counterparties. Financial services institutions are interrelated as a result of trading, clearing, counterparty or other relationships. The Company has exposure to many different industries and counterparties and routinely executes transactions with counterparties in the financial industry, including brokers and dealers, commercial banks, investment banks, mutual funds, and other institutional clients. Transactions with these institutions include overnight and term borrowings, interest rate swap agreements, securities purchased and sold, short-term investments, and other such transactions. As a result of this exposure, defaults by, or rumors or questions about, one or more financial services institutions or the financial services industry in general, could lead to market-wide liquidity problems and defaults by other institutions. Many of these transactions expose the Company to credit risk in the event of default of its counterparty or client, while other transactions expose the Company to liquidity risks should funding sources quickly disappear. In addition, the Company’s credit risk may be exacerbated when the collateral held cannot be realized or is liquidated at prices not sufficient to recover the full amount of the exposure due to the Company. Any such losses could materially and adversely affect results of operations.

The Company is subject to increasingly extensive government regulation and supervision.

As part of the financial services industry, the Company has been subject to increasingly extensive federal and state regulation and supervision over the past several years. Banking regulations are primarily intended to protect depositors’ funds, federal deposit insurance funds, and the banking system as a whole, not shareholders. These regulations affect the Company’s lending practices, capital structure, investment practices, dividend policy, and growth, among other things. Congress and federal regulatory agencies continually review banking laws, regulations, and policies for possible changes. Changes to statutes, regulations, or regulatory policies, including changes in interpretation or implementation of statutes, regulations, or policies, could affect the Company in substantial and unpredictable ways. Such changes could subject the Company to additional costs, limit the types of financial services and products it may offer, and / or increase the ability of nonbanks to offer competing financial services and products, among other things. Failure to comply with laws, regulations, or policies could result in sanctions by regulatory agencies, civil money penalties, and / or reputation damage, which could have a material adverse effect on the Company’s business, financial condition, and results of operations. While the Company has policies and procedures designed to prevent any such violations, there can be no assurance that such violations will not occur.

Significant changes in federal monetary policy could materially affect the Company’s business.

The Federal Reserve System regulates the supply of money and credit in the United States. Its policies determine in large part the cost of funds for lending and interest rates earned on loans and paid on borrowings and interest bearing deposits. Credit conditions are influenced by its open market operations in U.S. government securities, changes in the member bank discount rate, and bank reserve requirements. Changes in Federal Reserve Board policies are beyond the Company’s control and difficult to predict, and such changes may result in lower interest margins and a continued lack of demand for credit products.

9

The Company is subject to both interest rate and liquidity risk.

With oversight from its Asset-Liability Management Committee, the Company devotes substantial resources to monitoring its liquidity and interest rate risk on a monthly basis. The Company's net interest income is the largest source of overall revenue to the Company, representing 59% of total revenue for the year ended at December 31, 2017. The interest rate environment in which the Company operates fluctuates in response to general economic conditions and policies of various governmental and regulatory agencies, particularly the Federal Reserve Board. Changes in monetary policy, including changes in interest rates, will influence loan originations, deposit generation, demand for investments and revenues and costs for earning assets and liabilities.

The Federal Reserve Board raised the benchmark interest rate three times during 2017 for a total of 75 basis points. Further rate increases are expected in 2018. The Company saw only a slight decline in period end deposit balances; however, additional rate increases may result in customer deposit withdrawals which, if significant, may affect the Company’s source of funds for future loan growth. These actions may include reductions in its investment portfolio or higher borrowings, and could reduce net interest income and related margins.

The Company’s asset valuation may include methodologies, models, estimations and assumptions which are subject to differing interpretations and could result in changes to asset valuations that may materially adversely affect its results of operations or financial condition.

The Company uses estimates, assumptions, and judgments when certain financial assets and liabilities are measured and reported at fair value. Assets and liabilities carried at fair value inherently result in a higher degree of financial statement volatility. Fair values and the information used to record valuation adjustments for certain assets and liabilities are based on quoted market prices and/or other observable inputs provided by independent third-party sources, when available. When such third-party information is not available, fair value is estimated primarily by using cash flow and other financial modeling techniques utilizing assumptions such as credit quality, liquidity, interest rates and other relevant inputs. Changes in underlying factors, assumptions, or estimates in any of these areas could materially impact the Company’s future financial condition and results of operations.

During periods of market disruption, including periods of significantly rising or high interest rates, rapidly widening credit spreads or illiquidity, it may be difficult to value certain assets if trading becomes less frequent and/or market data becomes less observable. There may be certain asset classes in active markets with significant observable data that become illiquid due to the current financial environment. In such cases, certain asset valuations may require more subjectivity and management judgment. As such, valuations may include inputs and assumptions that are less observable or require greater estimation. Further, rapidly changing and unprecedented credit and equity market conditions could materially impact the valuation of assets as reported within the Company’s consolidated financial statements, and the period-to-period changes in value could vary significantly. Decreases in value may have a material adverse effect on results of operations or financial condition.

The processes the Company uses to estimate the fair value of financial instruments, as well as the processes used to estimate the effects of changing interest rates and other market measures on the Company’s financial condition and results of operations, depend upon the use of analytical and forecasting models. If these models are inadequate or inaccurate due to flaws in their design or implementation, the fair value of such financial instruments may not accurately reflect what the Company could realize upon sale or settlement of such financial instruments, or the Company may incur increased or unexpected losses upon changes in market interest rates or other market measures. Any such failure in the Company's analytical or forecasting models could have a material adverse effect on the Company business, financial condition and results of operations.

The Company’s investment portfolio values may be adversely impacted by deterioration in the credit quality of underlying collateral within the various categories of investment securities it owns.

The Company generally invests in securities issued by municipal entities, government-backed agencies or privately issued securities that are highly rated and evaluated at the time of purchase, however, these securities are subject to changes in market value due to changing interest rates and implied credit spreads. While the Company maintains rigorous risk management practices over bonds issued by municipalities, credit deterioration in these bonds could occur and result in losses. Certain mortgage and asset-backed securities (which are collateralized by residential mortgages, credit cards, automobiles, mobile homes or other assets) may decline in value due to actual or expected deterioration in the underlying collateral. Under accounting rules, when the impairment is due to declining expected cash flows, some portion of the impairment, depending on the Company’s intent to sell and the likelihood of being required to sell before recovery, must be recognized in current earnings. This could result in significant non-cash losses.

Future loan losses could increase.

The Company maintains an allowance for loan losses that represents management’s best estimate of probable losses that have been incurred at the balance sheet date within the existing portfolio of loans. The level of the allowance reflects management’s continuing evaluation of industry concentrations, specific credit risks, loan loss experience including emergence periods, current loan portfolio quality, present economic, political and regulatory conditions and unidentified losses inherent in the current loan

10

portfolio. Although the loan losses have been stable during the past several years, an unforeseen deterioration of financial market conditions could result in larger loan losses, which may negatively affect the Company's results of operations and could further increase levels of its allowance. In addition, the Company’s allowance level is subject to review by regulatory agencies, and that review could result in adjustments to the allowance. See the section captioned “Allowance for Loan Losses” in Item 7, Management’s Discussion and Analysis of Financial Condition and Results of Operations, of this report for further discussion related to the Company’s process for determining the appropriate level of the allowance for probable loan loss.

New lines of business or new products and services may subject the Company to additional risk.

From time to time, the Company may implement new lines of business or offer new products and services within existing lines of business. There are substantial risks and uncertainties associated with these efforts, particularly in instances where the markets are not fully developed. In developing and marketing new lines of business and new products or services, the Company may invest significant time and resources. Initial timetables for the introduction and development of new lines of business and new products or services may not be achieved and price and profitability targets may not prove feasible. External factors, such as compliance with regulations, competitive alternatives and shifting market preferences may also impact the successful implementation of a new line of business or a new product or service. Furthermore, any new line of business or new product or service could have a significant impact on the effectiveness of the Company’s system of internal controls. Failure to successfully manage these risks in the development and implementation of new lines of business and new products or services could have a material adverse effect on the Company’s financial condition and results of operations.

The Company’s reputation and future growth prospects could be impaired if cyber-security attacks or other computer system breaches occur.

The Company relies heavily on communications and information systems to conduct its business, and as part of its business, the Company maintains significant amounts of data about its customers and the products they use. Information security risks for financial institutions have increased recently due to new technologies, the use of the Internet and telecommunications technologies (including mobile devices) to conduct financial and other business transactions, and the increased sophistication and activities of organized crime, perpetrators of fraud, hackers, and others. While the Company has policies and procedures and safeguards designed to prevent or limit the effect of failure, interruption or security breach of its information systems, there can be no assurances that any such failures, interruptions or security breaches will not occur; or if they do occur, that they will be adequately addressed. In addition to unauthorized access, denial-of-service attacks could overwhelm Company Web sites and prevent the Company from adequately serving customers. Should any of the Company's systems become compromised, the reputation of the Company could be damaged, relationships with existing customers may be impaired, and the Company could be subject to lawsuits, all of which could result in lost business, and as a result, the Company could incur significant expenses trying to remedy the incident.

The Company’s operations rely on certain external vendors.

The Company relies on third-party vendors to provide products and services necessary to maintain day-to-day operations. For example, the Company outsources a portion of its information systems, communication, data management and transaction processing to third parties. Accordingly, the Company is exposed to the risk that these vendors might not perform in accordance with the contracted arrangements or service level agreements because of changes in the vendor’s organizational structure, financial condition, support for existing products and services, or strategic focus. Such failure to perform could be disruptive to the Company’s operations, which could have a materially adverse impact on its business, results of operations and financial condition. These third parties are also sources of risk associated with operational errors, system interruptions or breaches and unauthorized disclosure of confidential information. If the vendors encounter any of these issues, the Company could be exposed to disruption of service, damage to reputation and litigation. Because the Company is an issuer of both debit and credit cards, it is periodically exposed to losses related to security breaches which occur at retailers that are unaffiliated with the Company (e.g., customer card data being compromised at retail stores).  These losses include, but are not limited to, costs and expenses for card reissuance as well as losses resulting from fraudulent card transactions.

The Company continually encounters technological change.

The financial services industry is continually undergoing rapid technological change with frequent introductions of new technology-driven products and services, including the entrance of financial technology companies offering new financial service products. The effective use of technology increases efficiency and enables financial institutions to better serve customers and to reduce costs. The Company’s future success depends, in part, upon its ability to address the needs of its customers by using technology to provide products and services that will satisfy customer demands, as well as to create additional efficiencies in the Company’s operations. Many of the Company’s competitors have substantially greater resources to invest in technological improvements. The Company may not be able to effectively implement new technology-driven products and services or be successful in marketing these products and services to its customers. Failure to successfully keep pace with technological change affecting the financial services industry could have a material adverse effect on the Company’s business, financial condition and results of operations.

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Commerce Bancshares, Inc. relies on dividends from its subsidiary bank for most of its revenue.

Commerce Bancshares, Inc. is a separate and distinct legal entity from its banking and other subsidiaries. It receives substantially all of its revenue from dividends from its subsidiary bank. These dividends, which are limited by various federal and state regulations, are the principal source of funds to pay dividends on its preferred and common stock and to meet its other cash needs. In the event the subsidiary bank is unable to pay dividends to it, Commerce Bancshares, Inc. may not be able to pay dividends or other obligations, which would have a material adverse effect on the Company's financial condition and results of operations.

The Company may not attract and retain skilled employees.

The Company’s success depends, in large part, on its ability to attract and retain key people. Competition for the best people can be intense, and the Company spends considerable time and resources attracting and hiring qualified people for its various business lines and support units. The unexpected loss of the services of one or more of the Company’s key personnel could have a material adverse impact on the Company’s business because of their skills, knowledge of the Company’s market, and years of industry experience, as well as the difficulty of promptly finding qualified replacement personnel.

The Tax Cuts and Jobs Act of 2017 may have unexpected consequences for the Company.

In December 2017, the Tax Cuts and Jobs Act of 2017 ("the Act") was passed. Among other elements, the Act reduces income tax rates for businesses and individuals. While the Act significantly lowers the Company's income tax expense, the effect of lower tax rates on customer behavior remains uncertain. Lowering the business and individual income tax rates may reduce demand for loans and impact deposit balances, which may negatively affect the Company's financial position.

Item 1b. UNRESOLVED STAFF COMMENTS

None

Item 2. PROPERTIES

The main offices of the Bank are located in the larger metropolitan areas of its markets in various multi-story office buildings. The Bank owns its main offices and leases unoccupied premises to the public. The larger office buildings include:

Building	Net rentable square footage	% occupied in total		% occupied by Bank
922 Walnut Kansas City, MO	256,000	95	%	93	%
1000 Walnut Kansas City, MO	391,000	86		45
811 Main Kansas City, MO	237,000	100		100
8000 Forsyth Clayton, MO	178,000	100		100
1551 N. Waterfront Pkwy Wichita, KS	124,000	96		34

The Company has an additional 171 branch locations in Missouri, Illinois, Kansas, Oklahoma and Colorado which are owned or leased, and 151 off-site ATM locations.

Item 3. LEGAL PROCEEDINGS

The information required by this item is set forth in Item 8 under Note 19, Commitments, Contingencies and Guarantees on page 113.

Item 4. MINE SAFETY DISCLOSURES

Not applicable

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Executive Officers of the Registrant

The following are the executive officers of the Company as of February 22, 2018, each of whom is designated annually. There are no arrangements or understandings between any of the persons so named and any other person pursuant to which such person was designated an executive officer.

Name and Age	Positions with Registrant
Jeffery D. Aberdeen, 63	Controller of the Company since December 1995. He is also Controller of the Company's subsidiary bank, Commerce Bank.
Kevin G. Barth, 57	Executive Vice President of the Company since April 2005, and Community President and Chief Executive Officer of Commerce Bank since October 1998. Senior Vice President of the Company and Officer of Commerce Bank prior thereto.
Jeffrey M. Burik, 59	Senior Vice President of the Company since February 2013. Executive Vice President of Commerce Bank since November 2007.
Daniel D. Callahan, 61	Executive Vice President and Chief Credit Officer of the Company since December 2010 and Senior Vice President of the Company prior thereto. Executive Vice President of Commerce Bank since May 2003.
Sara E. Foster, 57	Executive Vice President of the Company since February 2012 and Senior Vice President of the Company prior thereto. Executive Vice President of Commerce Bank since January 2016 and Senior Vice President of Commerce Bank prior thereto.
John K. Handy, 55	Executive Vice President of the Company since January 2018 and Senior Vice President of the Company prior thereto. Community President and Chief Executive Officer of Commerce Bank since January 2018 and Senior Vice President of Commerce Bank prior thereto.
Robert S. Holmes, 54	Executive Vice President of the Company since April 2015, and Community President and Chief Executive Officer of Commerce Bank since January 2016. Prior to his employment with Commerce Bank in March 2015, he was employed at a Midwest regional bank where he served as managing director and head of Regional Banking.
Patricia R. Kellerhals, 60	Senior Vice President of the Company since February 2016 and Vice President of the Company prior thereto. Executive Vice President of Commerce Bank since 2005.
David W. Kemper, 67	Chairman of the Board of Directors of the Company since November 1991, and Chief Executive Officer of the Company since June 1986. He was President of the Company from April 1982 until February 2013. He is Chairman of the Board and Chief Executive Officer of Commerce Bank. He is the brother of Jonathan M. Kemper, Vice Chairman of the Company, and father of John W. Kemper, President and Chief Operating Officer of the Company.
John W. Kemper, 40	President and Chief Operating Officer of the Company since February 2013, and President of Commerce Bank since March 2013. Prior thereto, and since October 2010, he was Executive Vice President and Chief Administrative Officer of the Company and Senior Vice President of Commerce Bank. Member of Board of Directors since September 2015. He is the son of David W. Kemper, Chairman and Chief Executive Officer of the Company and nephew of Jonathan M. Kemper, Vice Chairman of the Company.
Jonathan M. Kemper, 64	Vice Chairman of the Company since November 1991 and Vice Chairman of Commerce Bank since December 1997. Prior thereto, he was Chairman of the Board, Chief Executive Officer, and President of Commerce Bank. He is the brother of David W. Kemper, Chairman and Chief Executive Officer of the Company, and uncle of John W. Kemper, President and Chief Operating Officer of the Company.
Charles G. Kim, 57	Chief Financial Officer of the Company since July 2009. Executive Vice President of the Company since April 1995 and Executive Vice President of Commerce Bank since January 2004. Prior thereto, he was Senior Vice President of Commerce Bank.
Paula S. Petersen, 51	Senior Vice President of the Company since July 2016 and Executive Vice President of Commerce Bank since March 2012.
Michael J. Petrie, 61	Senior Vice President of the Company since April 1995. Prior thereto, he was Vice President of the Company.
David L. Roller, 47	Senior Vice President of the Company since July 2016 and Senior Vice President of Commerce Bank since September 2010.

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PART II

Item 5. MARKET FOR REGISTRANT’S COMMON EQUITY, RELATED STOCKHOLDER MATTERS AND ISSUER PURCHASES OF EQUITY SECURITIES

Commerce Bancshares, Inc.

Common Stock Data

The following table sets forth the high and low prices of actual transactions in the Company’s common stock and cash dividends paid for the periods indicated (restated for the 5% stock dividend distributed in December 2017).

	Quarter	High		Low		Cash Dividends
2017	First	$	57.72	$	50.62	$	.214
	Second	55.18		49.54		.214
	Third	56.42		49.43		.214
	Fourth	57.91		52.07		.214
2016	First	$	41.69	$	33.96	$	.204
	Second	44.82		38.98		.204
	Third	46.53		41.49		.204
	Fourth	56.40		43.21		.204
2015	First	$	37.97	$	34.15	$	.194
	Second	41.46		35.88		.194
	Third	42.07		36.67		.194
	Fourth	42.72		37.55		.194

Commerce Bancshares, Inc. common shares are listed on the Nasdaq Global Select Market (NASDAQ) under the symbol CBSH. The Company had 3,750 common shareholders of record as of December 31, 2017. Certain of the Company's shares are held in "nominee" or "street" name and the number of beneficial owners of such shares is approximately 60,000.

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Performance Graph

The following graph presents a comparison of Company (CBSH) performance to the indices named below. It assumes $100 invested on December 31, 2012 with dividends invested on a cumulative total shareholder return basis.

	2012	2013	2014	2015	2016	2017
Commerce (CBSH)	100.00	137.30	142.35	149.14	216.71	223.28
NASDAQ OMX Global-Bank	100.00	136.62	152.78	156.15	197.60	233.94
S&P 500	100.00	132.37	150.48	152.55	170.73	207.99

The following table sets forth information about the Company’s purchases of its $5 par value common stock, its only class of common stock registered pursuant to Section 12 of the Exchange Act, during the fourth quarter of 2017.

Period	Total Number of Shares Purchased	Average Price Paid per Share		Total Number of Shares Purchased as Part of Publicly Announced Program	Maximum Number that May Yet Be Purchased Under the Program
October 1—31, 2017	11,331		$57.91	11,331	3,547,014
November 1—30, 2017	55,600		$56.96	55,600	3,491,414
December 1—31, 2017	47,891		$54.86	47,891	3,443,523
Total	114,822		$56.18	114,822	3,443,523

The Company’s stock purchases shown above were made under authorizations by the Board of Directors. Under the most recent authorization in October 2015 of 5,000,000 shares, 3,443,523 shares remained available for purchase at December 31, 2017.

Item 6. SELECTED FINANCIAL DATA

The required information is set forth below in Item 7.

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Item 7. MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

Forward-Looking Statements

This report may contain “forward-looking statements” that are subject to risks and uncertainties and include information about possible or assumed future results of operations. Many possible events or factors could affect the future financial results and performance of Commerce Bancshares, Inc. and its subsidiaries (the "Company"). This could cause results or performance to differ materially from those expressed in the forward-looking statements. Words such as “expects”, “anticipates”, “believes”, “estimates”, variations of such words and other similar expressions are intended to identify such forward-looking statements. These statements are not guarantees of future performance and involve certain risks, uncertainties and assumptions which are difficult to predict. Therefore, actual outcomes and results may differ materially from what is expressed or forecasted in, or implied by, such forward-looking statements. Readers should not rely solely on the forward-looking statements and should consider all uncertainties and risks discussed throughout this report. Forward-looking statements speak only as of the date they are made. The Company does not undertake to update forward-looking statements to reflect circumstances or events that occur after the date the forward-looking statements are made or to reflect the occurrence of unanticipated events. Such possible events or factors include the risk factors identified in Item 1a Risk Factors and the following: changes in economic conditions in the Company’s market area; changes in policies by regulatory agencies, governmental legislation and regulation; fluctuations in interest rates; changes in liquidity requirements; demand for loans in the Company’s market area; changes in accounting and tax principles; estimates made on income taxes; failure of litigation settlement agreements to become final in accordance with their terms; and competition with other entities that offer financial services.

Overview

The Company operates as a super-community bank and offers a broad range of financial products to consumer and commercial customers, delivered with a focus on high-quality, personalized service. It is the largest bank holding company headquartered in Missouri, with its principal offices in Kansas City and St. Louis, Missouri. Customers are served from 327 locations in Missouri, Kansas, Illinois, Oklahoma and Colorado and commercial offices throughout the nation's midsection. A variety of delivery platforms are utilized, including an extensive network of branches and ATM machines, full-featured online banking, and a central contact center.

The core of the Company’s competitive advantage is its focus on the local markets in which it operates, its offering of competitive, sophisticated financial products, and its concentration on relationship banking and high-touch service. In order to enhance shareholder value, the Company targets core revenue growth. To achieve this growth, the Company focuses on strategies that will expand new and existing customer relationships, offer opportunities for controlled expansion in additional markets, utilize improved technology, and enhance customer satisfaction.

Various indicators are used by management in evaluating the Company’s financial condition and operating performance. Among these indicators are the following:

• Net income and earnings per share — Net income attributable to Commerce Bancshares, Inc. was $319.4 million, an increase of 16.0% compared to the previous year. The return on average assets was 1.28% in 2017, and the return on average common equity was 12.46%. Diluted earnings per share increased 16.1% in 2017 compared to 2016.

• Total revenue — Total revenue is comprised of net interest income and non-interest income. Total revenue in 2017 increased $65.8 million over 2016, driven by growth in both net interest income and non-interest income of $53.6 million and $12.2 million, respectively. Net interest income increased over 2016 due in part to higher average loan balances, which grew 5.2%, as well as higher average rates earned on loans, as average rates earned during 2017 increased 21 basis points over 2016. Higher average rates earned on investment securities, which increased 9 basis points over 2016, also contributed to the growth in net interest income. The growth was partly offset by higher average rates paid on deposits and borrowings. Overall, the net interest margin (tax equivalent) increased to 3.20% in 2017, a 16 basis point increase over 2016. Growth in non-interest income resulted principally from increases in trust fees, deposit fees, and loan fees and sales.

• Non-interest expense — Total non-interest expense grew 7.3% this year compared to 2016, mainly as a result of higher costs for salaries and employee benefits and due to donations of $32.0 million to a related foundation during 2017. Excluding the current year donations, total non-interest expense grew 2.9% over the prior year.

• Asset quality — Net loan charge-offs in 2017 increased $9.7 million over those recorded in 2016 and averaged .31% of loans compared to .25% in the previous year. Total non-performing assets, which include non-accrual loans and foreclosed

16

real estate, amounted to $12.7 million at December 31, 2017, a decrease of $2.0 million from balances at the previous year end, and represented .09% of loans outstanding.

• Shareholder return — Total shareholder return, including the change in stock price and dividend reinvestment, was 3.0% over the past year and 17.4% over the past five years. The Company's shareholder return was 10.1% over the past 10 years compared to the KBW Bank Index return of 4.1%. During 2017, the Company paid cash dividends of $.857 per share on its common stock, representing an increase of 5% over the previous year, and paid dividends of 6% on its preferred stock. In 2017, the Company issued its 24th consecutive annual 5% common stock dividend, and in January 2018, the Company's Board of Directors authorized an increase of nearly 10% in the common cash dividend, which is its 50th consecutive annual increase.

The following discussion and analysis should be read in conjunction with the consolidated financial statements and related notes. The historical trends reflected in the financial information presented below are not necessarily reflective of anticipated future results.

Key Ratios

	2017		2016		2015		2014		2013
(Based on average balances)
Return on total assets	1.28	%	1.12	%	1.11	%	1.15	%	1.19	%
Return on common equity	12.46		11.33		11.43		11.65		11.99
Equity to total assets	10.53		10.16		10.00		10.10		9.95
Loans to deposits (1)	66.18		63.71		61.44		59.91		57.12
Non-interest bearing deposits to total deposits	34.85		34.67		35.12		33.73		33.01
Net yield on interest earning assets (tax equivalent basis)	3.20		3.04		2.94		3.00		3.11
(Based on end of period data)
Non-interest income to revenue(2)	39.88		41.09		41.40		41.31		40.34
Efficiency ratio(3)	62.97		61.98		62.34		61.96		60.42
Tier I common risk-based capital ratio (4)	12.65		11.62		11.52		NA		NA
Tier I risk-based capital ratio(4)	13.41		12.38		12.33		13.74		14.06
Total risk-based capital ratio (4)	14.35		13.32		13.28		14.86		15.28
Tier I leverage ratio (4)	10.39		9.55		9.23		9.36		9.43
Tangible common equity to tangible assets ratio(5)	9.84		8.66		8.48		8.55		9.00
Common cash dividend payout ratio	29.52		32.69		33.35		32.69		31.46

(1) Includes loans held for sale.

(2) Revenue includes net interest income and non-interest income.

(3) The efficiency ratio is calculated as non-interest expense (excluding intangibles amortization) as a percent of revenue.

(4) Risk-based capital information at December 31, 2017, 2016 and 2015 was prepared under Basel III requirements, which were effective January 1, 2015. Risk-based capital information for prior years was prepared under Basel I requirements.

(5) The tangible common equity to tangible assets ratio is a measurement which management believes is a useful indicator of capital adequacy and utilization. It provides a meaningful basis for period to period and company to company comparisons, and also assist regulators, investors and analysts in analyzing the financial position of the Company. Tangible common equity and tangible assets are non-GAAP measures and should not be viewed as substitutes for, or superior to, data prepared in accordance with GAAP.

17

The following table is a reconciliation of the GAAP financial measures of total equity and total assets to the non-GAAP measures of total tangible common equity and total tangible assets.

(Dollars in thousands)	2017			2016			2015			2014			2013
Total equity	$	2,718,184		$	2,501,132		$	2,367,418		$	2,334,246		$	2,214,397
Less non-controlling interest	1,624			5,349			5,428			4,053			3,755
Less preferred stock	144,784			144,784			144,784			144,784			—
Less goodwill	138,921			138,921			138,921			138,921			138,921
Less core deposit premium	2,965			3,841			5,031			6,572			8,489
Total tangible common equity (a)	$	2,429,890		$	2,208,237		$	2,073,254		$	2,039,916		$	2,063,232
Total assets	$	24,833,415		$	25,641,424		$	24,604,962		$	23,994,280		$	23,072,036
Less goodwill	138,921			138,921			138,921			138,921			138,921
Less core deposit premium	2,965			3,841			5,031			6,572			8,489
Total tangible assets (b)	$	24,691,529		$	25,498,662		$	24,461,010		$	23,848,787		$	22,924,626
Tangible common equity to tangible assets ratio (a)/(b)	9.84		%	8.66		%	8.48		%	8.55		%	9.00		%

Selected Financial Data

(In thousands, except per share data)	2017		2016			2015		2014		2013
Net interest income	$	733,679	$	680,049		$	634,320	$	620,204	$	619,372
Provision for loan losses	45,244		36,318			28,727		29,531		20,353
Non-interest income	486,604		474,392			448,139		436,506		418,865
Investment securities gains (losses), net	25,051		(53		)	6,320		14,124		(4,425		)
Non-interest expense	769,684		717,065			676,487		656,870		629,147
Net income attributable to Commerce Bancshares, Inc.	319,383		275,391			263,730		261,754		260,961
Net income available to common shareholders	310,383		266,391			254,730		257,704		260,961
Net income per common share-basic*	2.90		2.50			2.33		2.27		2.24
Net income per common share-diluted*	2.89		2.49			2.32		2.26		2.23
Cash dividends on common stock	91,619		87,070			84,961		84,241		82,104
Cash dividends per common share*	.857		.816			.777		.740		.705
Market price per common share*	55.84		55.06			38.59		37.57		36.95
Book value per common share*	24.14		22.12			20.74		19.63		19.00
Common shares outstanding*	106,615		106,534			107,192		111,511		116,544
Total assets	24,833,415		25,641,424			24,604,962		23,994,280		23,072,036
Loans, including held for sale	14,005,072		13,427,192			12,444,299		11,469,238		10,956,836
Investment securities	8,893,307		9,770,986			9,901,680		9,645,792		9,042,997
Deposits	20,425,446		21,101,095			19,978,853		19,475,778		19,047,348
Long-term debt	1,758		102,049			103,818		104,058		455,310
Equity	2,718,184		2,501,132			2,367,418		2,334,246		2,214,397
Non-performing assets	12,664		14,649			29,394		46,251		55,439

* Restated for the 5% stock dividend distributed in December 2017.

18

Results of Operations

										$ Change						% Change
(Dollars in thousands)	2017			2016			2015			'17-'16			'16-'15			'17-'16		'16-'15
Net interest income	$	733,679		$	680,049		$	634,320		$	53,630		$	45,729		7.9	%	7.2	%
Provision for loan losses	(45,244		)	(36,318		)	(28,727		)	8,926			7,591			24.6		26.4
Non-interest income	486,604			474,392			448,139			12,212			26,253			2.6		5.9
Investment securities gains (losses), net	25,051			(53		)	6,320			25,104			(6,373		)	N.M.		N.M.
Non-interest expense	(769,684		)	(717,065		)	(676,487		)	52,619			40,578			7.3		6.0
Income taxes	(110,506		)	(124,151		)	(116,590		)	(13,645		)	7,561			(11.0	)	6.5
Non-controlling interest expense	(517		)	(1,463		)	(3,245		)	(946		)	(1,782		)	(64.7	)	(54.9	)
Net income attributable to Commerce Bancshares, Inc.	319,383			275,391			263,730			43,992			11,661			16.0		4.4
Preferred stock dividends	(9,000		)	(9,000		)	(9,000		)	—			—			N.M.		N.M.
Net income available to common shareholders	$	310,383		$	266,391		$	254,730		$	43,992		$	11,661		16.5	%	4.6	%

Net income attributable to Commerce Bancshares, Inc. for 2017 was $319.4 million, an increase of $44.0 million, or 16.0%, compared to $275.4 million in 2016. Diluted income per common share increased 16.1% to $2.89 in 2017, compared to $2.49 in 2016. The increase in net income resulted from increases of $53.6 million in net interest income, $12.2 million in non-interest income, and $25.1 million in investment securities gains, as well as a decrease of $13.6 million in income tax expense. These increases in net income were partly offset by increases of $52.6 million in non-interest expense and $8.9 million in the provision for loan losses. The return on average assets was 1.28% in 2017 compared to 1.12% in 2016, and the return on average common equity was 12.46% in 2017 compared to 11.33% in 2016. At December 31, 2017, the ratio of tangible common equity to assets increased to 9.84%, compared to 8.66% at year end 2016.

During 2017, net interest income increased $53.6 million compared to 2016. This increase reflected growth of $53.9 million in interest on loans, resulting from higher average balances and loan yields. In addition, interest on investment securities grew by $7.5 million due to higher rates earned, which included $2.0 million in additional inflation income earned on the Company's portfolio of U.S. Treasury inflation-protected securities (TIPS). Interest expense on deposits and borrowings rose by $10.7 million largely due to higher average rates paid. The provision for loan losses increased $8.9 million over the previous year, totaling $45.2 million in 2017, and was $3.6 million higher than net loan charge-offs. Net charge-offs increased by $9.7 million in 2017 compared to 2016, mainly due to higher net charge-offs on consumer credit card loans and lower net recoveries on construction and business real estate loans.

Non-interest income in 2017 was $486.6 million, an increase of $12.2 million, or 2.6%, compared to $474.4 million in 2016. This increase resulted mainly from growth in trust fees, deposit account fees, and loan fees and sales, which increased $13.4 million, $3.7 million, and $2.5 million, respectively. Non-interest expense in 2017 was $769.7 million, an increase of $52.6 million over $717.1 million in 2016. The increase in non-interest expense included a $21.0 million, or 4.9%, increase in salaries and benefits expense due to higher full-time salaries, incentive compensation, and payroll taxes. Current period expense also included $32.0 million of contribution expense resulting from the donation of appreciated securities to a charitable foundation, as mentioned earlier. Investment securities net gains in 2017 totaled $25.1 million, largely resulting from these donations.

Net income attributable to Commerce Bancshares, Inc. for 2016 was $275.4 million, an increase of $11.7 million, or 4.4%, compared to $263.7 million in 2015. Diluted income per common share increased 7.3% to $2.49 in 2016, compared to $2.32 in 2015. The increase in net income resulted from increases of $45.7 million in net interest income and $26.3 million in non-interest income. These increases in net income were partly offset by increases of $40.6 million in non-interest expense, $7.6 million in the provision for loan losses, and $7.6 million in income tax expense, as well as a decrease of $6.4 million in investment securities gains. The return on average assets was 1.12% in 2016 compared to 1.11% in 2015, and the return on average common equity was 11.33% in 2016 compared to 11.43% in 2015. At December 31, 2016, the ratio of tangible common equity to assets increased to 8.66%, compared to 8.48% at year end 2015.

During 2016, net interest income increased $45.7 million compared to 2015. This increase reflected growth of $33.3 million in interest on loans, resulting from higher average balances. In addition, interest on investment securities grew by $15.4 million due to higher rates earned, which included $6.4 million in additional inflation income earned on the Company's portfolio of TIPS. Interest expense on deposits rose by $3.1 million due to higher balances and a slight increase in overall rates paid. The provision for loan losses increased $7.6 million over the previous year, totaling $36.3 million in 2016, and was $4.4 million higher than net

19

loan charge-offs. Net charge-offs decreased by $1.8 million in 2016 compared to 2015, mainly due to higher recoveries in construction and business real estate loans.

Non-interest income in 2016 was $474.4 million, an increase of $26.3 million, or 5.9%, compared to $448.1 million in 2015. This increase resulted mainly from growth in deposit account fees, trust fees, loan fees and sales, and bank card fees, which increased $6.0 million, $3.4 million, $3.2 million, and $3.0 million, respectively. Non-interest expense in 2016 was $717.1 million, an increase of $40.6 million over $676.5 million in 2015. The increase in non-interest expense included a $26.6 million, or 6.6%, increase in salaries and benefits expense due to higher full-time salaries, incentives, and medical plan costs. The net loss on investment securities transactions in 2016 was minimal, while a net gain of $6.3 million was recorded in 2015 that resulted from sales of available for sale securities and fair value adjustments and dispositions of private equity investments.

The Company distributed a 5% stock dividend for the 24th consecutive year on December 18, 2017. All per share and average share data in this report has been restated for the 2017 stock dividend.

Critical Accounting Policies

The Company's consolidated financial statements are prepared based on the application of certain accounting policies, the most significant of which are described in Note 1 to the consolidated financial statements. Certain of these policies require numerous estimates and strategic or economic assumptions that may prove inaccurate or be subject to variations which may significantly affect the Company's reported results and financial position for the current period or future periods. The use of estimates, assumptions, and judgments are necessary when financial assets and liabilities are required to be recorded at, or adjusted to reflect, fair value. Current economic conditions may require the use of additional estimates, and some estimates may be subject to a greater degree of uncertainty due to the current instability of the economy. The Company has identified several policies as being critical because they require management to make particularly difficult, subjective and/or complex judgments about matters that are inherently uncertain and because of the likelihood that materially different amounts would be reported under different conditions or using different assumptions. These policies relate to the allowance for loan losses, the valuation of certain investment securities, and accounting for income taxes.

Allowance for Loan Losses

The Company performs periodic and systematic detailed reviews of its loan portfolio to assess overall collectability. The level of the allowance for loan losses reflects the Company's estimate of the losses inherent in the loan portfolio at any point in time. While these estimates are based on substantive methods for determining allowance requirements, actual outcomes may differ significantly from estimated results, especially when determining allowances for business, construction and business real estate loans. These loans are normally larger and more complex, and their collection rates are harder to predict. Personal banking loans, including personal real estate, credit card and consumer loans, are individually smaller and perform in a more homogenous manner, making loss estimates more predictable. Further discussion of the methodology used in establishing the allowance is provided in the Allowance for Loan Losses section of Item 7 and in Note 1 to the consolidated financial statements.

Valuation of Investment Securities

The Company carries its investment securities at fair value and employs valuation techniques which utilize observable inputs when those inputs are available. These observable inputs reflect assumptions market participants would use in pricing the security and are developed based on market data obtained from sources independent of the Company. When such information is not available, the Company employs valuation techniques which utilize unobservable inputs, or those which reflect the Company’s own assumptions about market participants, based on the best information available in the circumstances. These valuation methods typically involve cash flow and other financial modeling techniques. Changes in underlying factors, assumptions, estimates, or other inputs to the valuation techniques could have a material impact on the Company's future financial condition and results of operations. Assets and liabilities carried at fair value inherently result in more financial statement volatility. Under the fair value measurement hierarchy, fair value measurements are classified as Level 1 (quoted prices), Level 2 (based on observable inputs) or Level 3 (based on unobservable, internally-derived inputs), as discussed in more detail in Note 15 on Fair Value Measurements. Most of the available for sale investment portfolio is priced utilizing industry-standard models that consider various assumptions observable in the marketplace or which can be derived from observable data. Such securities totaled approximately $7.8 billion, or 89.1%, of the available for sale portfolio at December 31, 2017, and were classified as Level 2 measurements. The Company also holds $17.0 million in auction rate securities. These were classified as Level 3 measurements, as no liquid market currently exists for these securities, and fair values were derived from internally generated cash flow valuation models which used unobservable inputs significant to the overall measurement.

Changes in the fair value of available for sale securities, excluding credit losses relating to other-than-temporary impairment, are reported in other comprehensive income. The Company periodically evaluates the available for sale portfolio for other-than-

20

temporary impairment. Evaluation for other-than-temporary impairment is based on the Company’s intent to sell the security and whether it is likely that it will be required to sell the security before the anticipated recovery of its amortized cost basis. If either of these conditions is met, the entire loss (the amount by which the amortized cost exceeds the fair value) must be recognized in current earnings. If neither condition is met, but the Company does not expect to recover the amortized cost basis, the Company must determine whether a credit loss has occurred. This credit loss is the amount by which the amortized cost basis exceeds the present value of cash flows expected to be collected from the security. The credit loss, if any, must be recognized in current earnings, while the remainder of the loss, related to all other factors, is recognized in other comprehensive income.

The estimation of whether a credit loss exists and the period over which the security is expected to recover requires significant judgment. The Company must consider available information about the collectability of the security, including information about past events, current conditions, and reasonable forecasts, which includes payment structure, prepayment speeds, expected defaults, and collateral values. Changes in these factors could result in additional impairment, recorded in current earnings, in future periods.

At December 31, 2017, certain non-agency guaranteed mortgage-backed securities with a fair value of $26.2 million were identified as other-than-temporarily impaired. The cumulative credit-related impairment loss recorded on these securities amounted to $14.2 million, which was recorded in the consolidated statements of income.

The Company, through its direct holdings and its private equity subsidiaries, has numerous private equity investments, categorized as non-marketable securities in the accompanying consolidated balance sheets. These investments are reported at fair value and totaled $57.2 million at December 31, 2017. Changes in fair value are reflected in current earnings and reported in investment securities gains (losses), net, in the consolidated statements of income. Because there is no observable market data for these securities, fair values are internally developed using available information and management’s judgment, and the securities are classified as Level 3 measurements. Although management believes its estimates of fair value reasonably reflect the fair value of these securities, key assumptions regarding the projected financial performance of these companies, the evaluation of the investee company’s management team, and other economic and market factors may affect the amounts that will ultimately be realized from these investments.

Accounting for Income Taxes

Accrued income taxes represent the net amount of current income taxes which are expected to be paid attributable to operations as of the balance sheet date. Deferred income taxes represent the expected future tax consequences of events that have been recognized in the financial statements or income tax returns. Deferred tax assets and liabilities are measured using the enacted tax rates that are expected to apply to taxable income when such assets and liabilities are anticipated to be settled or realized. Current and deferred income taxes are reported as either a component of other assets or other liabilities in the consolidated balance sheets, depending on whether the balances are assets or liabilities. Judgment is required in applying generally accepted accounting principles in accounting for income taxes. The Company regularly monitors taxing authorities for changes in laws and regulations and their interpretations by the judicial systems. The aforementioned changes, as well as any changes that may result from the resolution of income tax examinations by federal and state taxing authorities, may impact the estimate of accrued income taxes and could materially impact the Company’s financial position and results of operations.

21

Net Interest Income

Net interest income, the largest source of revenue, results from the Company’s lending, investing, borrowing, and deposit gathering activities. It is affected by both changes in the level of interest rates and changes in the amounts and mix of interest earning assets and interest bearing liabilities. The following table summarizes the changes in net interest income on a fully taxable equivalent basis, by major category of interest earning assets and interest bearing liabilities, identifying changes related to volumes and rates. Changes not solely due to volume or rate changes are allocated to rate.

	2017									2016
	Change due to									Change due to
(In thousands)	Average Volume			Average Rate			Total			Average Volume			Average Rate			Total
Interest income, fully taxable equivalent basis
Loans:
Business	$	5,190		$	15,053		$	20,243		$	13,067		$	4,916		$	17,983
Real estate- construction and land	3,628			6,235			9,863			10,794			(417		)	10,377
Real estate - business	9,284			3,420			12,704			5,502			(1,948		)	3,554
Real estate - personal	3,114			(264		)	2,850			1,402			(651		)	751
Consumer	3,441			2,548			5,989			4,661			(2,210		)	2,451
Revolving home equity	(669		)	1,388			719			(479		)	14			(465		)
Consumer credit card	(654		)	2,975			2,321			356			(510		)	(154		)
Total interest on loans	23,334			31,355			54,689			35,303			(806		)	34,497
Loans held for sale	(368		)	51			(317		)	1,175			(49		)	1,126
Investment securities:
U.S. government and federal agency obligations	3,831			238			4,069			2,985			7,463			10,448
Government-sponsored enterprise obligations	(3,108		)	(2,744		)	(5,852		)	(6,416		)	2,270			(4,146		)
State and municipal obligations	(1,191		)	3			(1,188		)	(1,148		)	1,355			207
Mortgage-backed securities	7,771			(1,036		)	6,735			7,587			(5,635		)	1,952
Asset-backed securities	(4,884		)	6,295			1,411			(3,798		)	9,586			5,788
Other securities	(1,151		)	4,199			3,048			1,993			(398		)	1,595
Total interest on investment securities	1,268			6,955			8,223			1,203			14,641			15,844
Federal funds sold and short-term securities purchased    under agreements to resell	36			116			152			(13		)	31			18
Long-term securities purchased under agreements to    resell	(1,765		)	3,661			1,896			(2,760		)	3,132			372
Interest earning deposits with banks	97			1,153			1,250			(46		)	491			445
Total interest income	22,602			43,291			65,893			34,862			17,440			52,302
Interest expense
Interest bearing deposits:
Savings	53			5			58			55			(8		)	47
Interest checking and money market	235			2,650			2,885			546			399			945
Time open and C.D.’s of less than $100,000	(272		)	108			(164		)	(318		)	(109		)	(427		)
Time open and C.D.’s of $100,000 and over	(439		)	2,753			2,314			264			2,230			2,494
Federal funds purchased and securities sold under agreements to repurchase	463			6,051			6,514			(447)			1,901			1,454
Other borrowings	(1,955		)	1,073			(882		)	2,347			(1,953		)	394
Total interest expense	(1,915		)	12,640			10,725			2,447			2,460			4,907
Net interest income, fully taxable equivalent basis	$	24,517		$	30,651		$	55,168		$	32,415		$	14,980		$	47,395

Net interest income totaled $733.7 million in 2017, increasing $53.6 million, or 7.9%, compared to $680.0 million in 2016. On a tax equivalent (T/E) basis, net interest income totaled $766.6 million, and increased $55.2 million over 2016. This increase included growth of $54.7 million in loan interest, resulting from higher average loan balances and higher rates earned. In addition, interest earned on investment securities increased $8.2 million, mainly due to higher rates earned. Interest expense on deposits and borrowings combined was $43.7 million, and increased $10.7 million compared to 2016 largely due to higher rates paid. The net yield on earning assets (T/E) was 3.20% in 2017 compared with 3.04% in 2016.

During 2017, loan interest income (T/E) grew $54.7 million over 2016 due to average loan growth of $683.9 million, or 5.3%. The average tax equivalent rate earned on the loan portfolio was 4.07% in 2017 compared to 3.86% in 2016. The higher rates

22

earned on the loan portfolio were partly related to actions taken by the Federal Reserve during 2017 to increase interest rate levels, which caused the Company's portfolio to re-price. The largest increase in loan interest occurred in business loans, which was higher by $20.2 million as a result of growth in the average rate earned of 31 basis points. Also contributing to the increase were higher average business loan balances of $179.5 million, or 3.9%, as growth trends continued in commercial and industrial, tax-free, and lease loans. Construction and land loan interest grew $9.9 million due to a 71 basis point increase in average rates and a $103.1 million, or 13.2%, increase in average balances. Business real estate interest was higher by $12.7 million as a result of an increase in average balances of $253.7 million, or 10.4%, along with an increase in average rates of 13 basis points. Interest earned on consumer loans increased $6.0 million over the prior year as the average rate increased 12 basis points and average balances increased $89.2 million. Personal real estate loan interest was higher by $2.9 million and resulted from growth in average balances of $83.3 million. Interest on consumer credit card loans rose $2.3 million due to a 40 basis point increase in the average rate earned.

Tax equivalent interest income on total investment securities increased $8.2 million during 2017, as the average rate earned increased nine basis points, while total average balances declined slightly. The average rate earned on the total investment portfolio was 2.52% in 2017 compared to 2.43% in 2016, while the average balance of the total investment securities portfolio (at amortized cost) was approximately $9.4 billion during both years. The increase in interest income was mainly due to higher interest earned on U.S. government obligations, mortgage-backed securities, and other non-marketable investments. Interest earned on U.S. government securities grew $4.1 million, which included growth of $2.0 million in inflation-adjusted interest on TIPS. In addition, average balances rose $179.9 million, or 24.5%. Interest income on mortgage-backed securities increased $6.7 million, due to an increase in average balances of $323.8 million, partly offset by a decline of three basis points in the average rate earned. Interest earned on asset-backed securities increased $1.4 million, mainly due to an increase of 30 basis points in the average rate earned, partly offset by a decline in average balances of $334.5 million. Interest income on non-marketable securities increased $3.1 million, largely due to one-time interest payments received on a private equity investment in 2017. Partly offsetting these increases in interest income were declines of $5.9 million and $1.2 million in interest on government-sponsored enteprise (GSE) and state and municipal securities, respectively. The decline in GSE interest resulted from a $139.4 million decline in average balances coupled with a rate decrease of 61 basis points, while state and municipal interest was lower due to a decrease of $33.0 million in average balances. Interest earned on deposits with banks increased $1.3 million mainly due to a 55 basis point increase in average rates earned. Interest on long-term securities purchased under resell agreements increased $1.9 million in 2017 compared to the prior year due to an increase in the average rate of 53 basis points, partly offset by a $103.2 million decrease in the average balances of these instruments.

During 2017, interest expense on deposits increased $5.1 million over 2016. This growth was comprised of higher interest expense on money market and interest checking accounts of $2.9 million and higher interest expense on certificates of deposit of $2.2 million. The increase in money market and interest checking interest expense resulted mainly from higher average rates paid, which rose three basis points. The growth in certificate of deposit interest expense was largely due to higher rates paid on certificates of deposit over $100,000, which increased 19 basis points, partly offset by lower total average certificate of deposit balances, which fell $139.6 million, or 6.3%. The overall rate paid on total deposits increased from .19% in 2016 to .23% in the current year. Interest expense on borrowings increased $5.6 million, due to higher average rates paid on repurchase agreements during 2017, partly offset by lower Federal Home Loan Bank (FHLB) borrowings. The overall average rate incurred on all interest bearing liabilities was .29% in 2017, compared to .22% in 2016.

During 2016, net interest income totaled $680.0 million, increasing $45.7 million, or 7.2%, compared to $634.3 million in 2015. On a tax equivalent (T/E) basis, net interest income totaled $711.4 million, and increased $47.4 million over 2015. This increase included growth of $34.5 million in loan interest, resulting from higher loan balances. In addition, interest earned on investment securities increased $15.8 million, due mainly to higher average rates earned. Interest expense on deposits and borrowings combined was $33.0 million in 2016, an increase of $4.9 million over 2015. The net yield on earning assets (T/E) was 3.04% in 2016 compared with 2.94% in 2015.

During 2016, loan interest income (T/E) grew $34.5 million over 2015 due to average loan growth of $1.1 billion, or 8.9%. The average tax equivalent rate earned on the loan portfolio was 3.86% in 2016 compared to 3.92% in 2015. The largest increase in loan interest occurred in business loans, which was higher by $18.0 million as a result of growth in average balances of $466.4 million, or 11.1%, further increased by higher average rates of 11 basis points. Construction and land loan interest grew $10.4 million due to a $301.5 million, or 63.2%, increase in average balances, partly offset by a six basis point decline in average rates. Business real estate interest was higher by $3.6 million as a result of an increase in average balances of $147.1 million, or 6.4%, partly offset by a decrease in average rates of eight basis points. Higher levels of interest were earned on consumer and personal real estate loans, which increased $2.5 million and $751 thousand, respectively. These increases were due to higher average balances, which increased 6.4% in consumer loans and 2.0% in personal real estate loans, partly offset by lower average rates earned. Partially offsetting the increases in interest earned, interest on revolving home equity loans decreased $465 thousand due

23

to lower average balances, while interest on consumer credit card loans decreased slightly due to a seven basis point decline in rates.

Tax equivalent interest income on total investment securities increased $15.8 million during 2016, as the average rate earned increased 19 basis points, while average balances declined $91.3 million, or 1.0%, from 2015. The average balance of the total investment securities portfolio (at amortized cost) was $9.4 billion and the average rate earned was 2.43% in 2016, compared to an average balance of $9.5 billion and an average rate earned of 2.24% in 2015. The increase in interest income was mainly due to higher interest earned on most security types, except for a decline of $4.1 million in interest on GSE obligations. Interest earned on U.S. government securities grew by $10.4 million, which included growth of $6.4 million in inflation-adjusted interest on TIPS. In addition, average balances rose $268.9 million, or 57.7%. Interest earned on asset-backed securities increased $5.8 million, mainly due to an increase of 39 basis points in the average rate earned, partly offset by a decline in the average balance of $355.0 million. Interest income on corporate debt securities increased $2.2 million, mainly due to growth of $75.7 million in average balances. Interest income on mortgage-backed securities increased $2.0 million, due to an increase in average balances of $296.4 million, partly offset by a decline of 16 basis points in average rates. Partly offsetting these increases in interest was the decline in GSE interest, resulting from a $346.8 million decline in average balances, but partly offset by a rate increase of 38 basis points. Interest earned on deposits with banks increased $445 thousand mainly due to a 26 basis point increase in average rates earned. Interest on long-term securities purchased under resell agreements increased $372 thousand in 2016 compared to 2015 due to an increase in the average rate of 40 basis points, partly offset by a $210.7 million decrease in average balances.

During 2016, interest expense on deposits increased $3.1 million over 2015. This growth was largely due to higher interest on certificates of deposit of $2.1 million and higher interest expense on money market and interest checking accounts of $945 thousand. The growth in certificate of deposit interest expense was largely due to higher rates paid on certificates of deposit over $100,000, which increased nine basis points. The increase in money market and interest checking interest expense resulted from both higher balances and rates paid. The overall rate paid on total deposits increased from .18% in 2015 to .19% in 2016. Interest expense on borrowings increased $1.8 million, due to higher average rates paid on repurchase agreements during 2016 and higher FHLB borrowings during the first quarter of 2016. The overall average rate incurred on all interest bearing liabilities was .22% in 2016, compared to .20% in 2015.

Provision for Loan Losses

The provision for loan losses totaled $45.2 million in 2017, an increase of $8.9 million over the 2016 provision of $36.3 million. The increase in the provision resulted mainly from a higher allowance for loan losses associated with loan portfolio growth and an increase in net loan charge-offs compared to the prior year.

Net loan charge-offs for the year totaled $41.6 million and increased $9.7 million compared to net loan charge-offs of $31.9 million in 2016. The increase in net loan charge-offs over the previous year was mainly the result of lower recoveries on commercial portfolio loans, which decreased $5.1 million, and higher net charge-offs on consumer credit card and consumer loans, which increased $4.8 million and $932 thousand, respectively. Partly offsetting these increases in net charge-offs were lower net loan charge-offs on revolving home equity and personal real estate loans. The allowance for loan losses totaled $159.5 million at December 31, 2017, an increase of $3.6 million compared to the prior year, and represented 1.14% of outstanding loans at year end 2017, compared to 1.16% at year end 2016. The provision for loan losses is recorded to bring the allowance for loan losses to a level deemed adequate by management based on the factors mentioned in the following “Allowance for Loan Losses” section of this discussion.

24

Non-Interest Income

										% Change
(Dollars in thousands)	2017			2016			2015			'17-'16		'16-'15
Bank card transaction fees	$	180,441		$	181,879		$	178,926		(.8	)%	1.7	%
Trust fees	135,159			121,795			118,437			11.0		2.8
Deposit account charges and other fees	90,060			86,394			80,416			4.2		7.4
Capital market fees	7,996			10,655			11,476			(25.0	)	(7.2	)
Consumer brokerage services	14,630			13,784			13,784			6.1		—
Loan fees and sales	13,948			11,412			8,228			22.2		38.7
Other	44,370			48,473			36,872			(8.5	)	31.5
Total non-interest income	$	486,604		$	474,392		$	448,139		2.6	%	5.9	%
Non-interest income as a % of total revenue*	39.9		%	41.1		%	41.4		%
Total revenue per full-time equivalent employee	$	254.2		$	241.3		$	226.9

* Total revenue is calculated as net interest income plus non-interest income.

Non-interest income totaled $486.6 million, an increase of $12.2 million, or 2.6%, compared to $474.4 million in 2016. Bank card fees decreased $1.4 million, or .8%, compared to the prior year, largely due to a decline in merchant fees of $4.2 million, resulting from the loss of several large customers over the last twelve months. This decline was partly offset by growth in debit card fees of $704 thousand, credit card fees of $625 thousand, and corporate card fees of $1.4 million. The table below is a summary of bank card transaction fees for the last three years.

							% Change
(Dollars in thousands)	2017		2016		2015		'17-'16		'16-'15
Debit card fees	$	40,134	$	39,430	$	38,330	1.8	%	2.9	%
Credit card fees	25,275		24,650		24,202		2.5		1.9
Merchant fees	23,680		27,840		26,784		(14.9	)	3.9
Corporate card fees	91,352		89,959		89,610		1.5		.4
Total bank card transaction fees	$	180,441	$	181,879	$	178,926	(.8	)%	1.7	%

Trust fee income increased $13.4 million, or 11.0%, as a result of continued growth in both personal (up 10.3%) and institutional (up 11.9%) trust fees. The market value of total customer trust assets totaled $48.7 billion at year end 2017, which was an increase of 13.1% over year end 2016 balances. Deposit account fees increased $3.7 million, or 4.2%, mainly due to growth in service charges on deposits of $2.5 million, or 12.1%. In addition, overdraft fees increased $1.2 million, or 4.2%, while corporate cash management fees were flat. In 2017, overdraft fees comprised 34.0% of total deposit fees, while corporate cash management fees comprised 40.0% of total deposit fees. Capital market fees declined $2.7 million, or 25.0%, due to continued lower sales volumes, while consumer brokerage services revenue increased $846 thousand, or 6.1%, due to a growth in advisory fees. Loan fees and sales increased $2.5 million this year mainly due to higher mortgage banking revenue related to the Company's fixed rate residential mortgage sale program. Total mortgage banking revenue totaled $9.2 million in 2017 compared to $6.6 million in 2016. Other non-interest income decreased $4.1 million, or 8.5%, from the prior year. This decrease was due in part to a decline in interest rate swap fees of $3.9 million due to lower origination volume. In addition, a large gain on a branch sale and a trust settlement were recorded in 2016 (mentioned below) which did not recur in 2017. These declines in current income were partly offset by higher gains of $1.2 million on sales of leased assets to customers upon lease termination.

During 2016, non-interest income increased $26.3 million, or 5.9%, compared to $448.1 million in 2015. Bank card fees increased $3.0 million, or 1.7%, over 2015. This growth included increases of $1.1 million, or 2.9%, in debit card fees, $1.1 million, or 3.9%, in merchant fees, and smaller increases in credit card and corporate card fees. Trust fee income increased $3.4 million, or 2.8%, as a result of growth in both personal (up 2.0%) and institutional (up 3.7%) trust fees. The market value of total customer trust assets totaled $43.1 billion at year end 2016, which was an increase of 12.2% over year end 2015 balances. Deposit account fees increased $6.0 million, or 7.4%, mainly due to growth in service charges on deposits of $4.4 million, or 26.3%. In addition, corporate cash management fees increased $1.4 million, or 4.1%, and overdraft fees increased $206 thousand. Capital market fees declined $821 thousand, or 7.2%, due to lower sales volumes, while consumer brokerage services revenue was unchanged. Loan fees and sales increased $3.2 million in 2016 compared to 2015, mainly due to $2.7 million in higher mortgage banking revenue. Other non-interest income increased $11.6 million, or 31.5%, over 2015. This increase was due in part to a gain of $3.3 million on the sale of a former branch property recorded in 2016. In addition, an accrual for a trust related settlement of $897 thousand was recorded in 2016. Cash sweep commissions, interest rate swap fees, and fees from sales of tax credits

25

increased $4.8 million, $1.5 million, and $942 thousand, respectively, over 2015. The increases were partly offset by lower operating lease revenue of $1.1 million.

Investment Securities Gains (Losses), Net

(In thousands)	2017			2016			2015
Net gains (losses) on sales of available for sale bonds	$	(9,695	)	$	109		$	2,925
Loss on called bond	(254		)	—			—
Net gains on sales of available for sale stock	10,054			—			—
Gains on donations of available for sale stock	31,074			—			—
Net gains (losses) on sales and fair value adjustments of private equity investments	(5,743		)	108			3,878
Other	(385		)	(270		)	(483		)
Total investment securities gains (losses), net	$	25,051		$	(53	)	$	6,320

Net gains and losses on investment securities during 2017, 2016 and 2015 are shown in the table above. Included in these amounts are gains and losses arising from sales of securities from the Company’s available for sale portfolio, including credit-related losses on debt securities identified as other-than-temporarily impaired. Also shown are gains and losses relating to non-marketable private equity investments, which are primarily held by the Parent’s majority-owned private equity subsidiaries. These include fair value adjustments, in addition to gains and losses realized upon disposition. The portions of private equity investment gains and losses that are attributable to minority interests are reported as non-controlling interest in the consolidated statements of income, and resulted in income of $575 thousand in 2017, compared to expense of $573 thousand and $2.3 million in 2016 and 2015, respectively.

Net securities gains of $25.1 million were recorded in 2017, which included $31.1 million in gains realized upon donation of available for sale stock, in addition to $10.1 million in gains on stock sales. These gains were offset by net losses in fair value totaling $5.8 million on private equity investments, in addition to net losses of $9.7 million on bond sales. The Company sold approximately $790 million of bonds, mainly mortgage and asset-backed securities, as part of a strategy to extend the duration of the securities portfolio and improve net interest margins. During 2017, credit-related impairment losses of $385 thousand were recorded on certain non-agency guaranteed mortgage-backed securities which have been identified as other-than-temporarily impaired. These identified securities had a total fair value of $26.2 million at December 31, 2017, compared to $31.2 million at December 31, 2016.

Net securities losses of $53 thousand were recorded in 2016, compared to net gains of $6.3 million in 2015. The 2016 net loss included $3.8 million in gains realized upon dispositions of private equity investments, including a $1.8 million gain resulting from the Parent's withdrawal from a private equity fund as required under the Volcker Rule investment prohibitions. These gains were offset by net losses in fair value totaling $3.7 million.

In 2015, the Company sold asset-backed securities, municipal securities, and TIPs from the portfolio, realizing gains of $2.8 million. Most of these sales were also part of a plan to extend the portfolio duration. In addition, net gains of $3.9 million on dispositions and fair value adjustments were recognized on private equity investments.

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Non-Interest Expense

										% Change
(Dollars in thousands)	2017			2016			2015			'17-'16		'16-'15
Salaries	$	380,945		$	360,840		$	340,521		5.6	%	6.0	%
Employee benefits	67,376			66,470			60,180			1.4		10.5
Net occupancy	45,612			46,290			44,788			(1.5	)	3.4
Equipment	18,568			19,141			19,086			(3.0	)	.3
Supplies and communication	22,790			24,135			22,970			(5.6	)	5.1
Data processing and software	92,246			92,722			83,944			(.5	)	10.5
Marketing	16,325			16,032			16,107			1.8		(.5	)
Deposit insurance	13,986			13,327			12,146			4.9		9.7
Community service	34,377			3,906			3,180			N.M.		22.8
Other	77,459			74,202			73,565			4.4		.9
Total non-interest expense	$	769,684		$	717,065		$	676,487		7.3	%	6.0	%
Efficiency ratio	63.0		%	62.0		%	62.3		%
Salaries and benefits as a % of total non-interest expense	58.2		%	59.6		%	59.2		%
Number of full-time equivalent employees	4,800			4,784			4,770

Non-interest expense was $769.7 million in 2017, an increase of $52.6 million, or 7.3%, over the previous year. Salaries and benefits expense increased $21.0 million, or 4.9%, mainly due to higher full-time salaries, incentive compensation, and payroll taxes. Incentive compensation included the accrual of a discretionary bonus of $3.3 million in December 2017 that will be paid to approximately 75% of all employees. Growth in salaries expense resulted partly from staffing additions in commercial and consumer, information technology, and other support units. Full-time equivalent employees totaled 4,800 at December 31, 2017, an increase of .3% over 2016. Occupancy expense decreased $678 thousand, mainly due to higher net rental income and lower demolition costs on a branch replacement project. Supplies and communication expense decreased by $1.3 million, or 5.6%, mainly due to reissuance costs for new chip cards distributed to customers in 2016 and lower office supplies expense. Data processing and software expense decreased $476 thousand, or .5%, mainly due to lower bank card processing costs resulting from a new vendor contract negotiated in the third quarter of 2017. This effect was partly offset by higher online subscription services and outsourced data provider fees. Equipment expense decreased by $573 thousand, or 3.0%, while deposit insurance expense was higher by $659 thousand, or 4.9%, due to higher insurance rates that were effective July 1, 2016. Costs for marketing increased slightly compared to the prior year. Community service costs increased $30.5 million due to the contribution of $32.0 million of appreciated securities to a related foundation during the current year. Other non-interest expense increased $3.3 million, or 4.4%, over the prior year mainly due to higher costs for legal and professional fees (up $1.2 million), bank card rewards expense (up $1.5 million), impairment losses on surplus branch sites (up $1.2 million), and lower deferred origination costs (down $1.5 million). These increases were partly offset by lower bank card operating costs of $2.2 million, also due to the new contract.

In 2016, non-interest expense was $717.1 million, an increase of $40.6 million, or 6.0%, over 2015. Salaries and benefits expense increased $26.6 million, or 6.6%, mainly due to higher full-time salaries, incentives, stock-based compensation, payroll taxes, and medical plan costs. Growth in salaries expense resulted partly from staffing additions in commercial banking, commercial card, residential mortgage, trust, and other support units. Full-time equivalent employees totaled 4,784 at December 31, 2016, an increase of .3% over 2015. Occupancy expense increased $1.5 million, mainly due to lower net rental income and the demolition costs associated with a branch building which was being replaced. Supplies and communication expense increased by $1.2 million, or 5.1%, mainly due to reissuance costs for new chip cards distributed to customers and higher data network expense. Data processing and software expense increased $8.8 million, or 10.5%, mainly due to higher software license costs, outsourced data provider fees, online subscription services, and bank card processing costs. Deposit insurance expense was higher by $1.2 million, or 9.7%, due to higher average assets and higher insurance rates that were effective July 1, 2016. Costs for marketing and equipment were relatively flat compared to 2015. Community service expense grew $726 thousand over 2015, mainly due to higher foundation contributions. Other non-interest expense increased $637 thousand in 2016 compared to 2015, partly due to a recovery of $2.8 million in 2015 related to a letter of credit exposure which had been drawn upon and subsequently paid off. In addition, higher costs were recorded for bank card rewards expense (up $2.4 million), loan collection fees (up $1.8 million), and legal and professional fees (up $1.2 million). These increases were partly offset by lower bank card fraud losses (down $3.8 million), lease asset depreciation expense (down $1.3 million), and higher deferred origination costs (up $2.6 million) in 2016.

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Income Taxes

Income tax expense was $110.5 million in 2017, compared to $124.2 million in 2016 and $116.6 million in 2015. The effective tax rate, including the effect of non-controlling interest, was 25.7% in 2017 compared to 31.1% in 2016 and 30.7% in 2015. The declines in tax expense and the effective tax rate in 2017 compared to 2016 and 2015 were largely due to the items mentioned below.

The Company adopted ASU 2016-09, "Improvements to Employee Share-Based Payment Accounting," on January 1, 2017, which requires all excess tax benefits (net of tax deficiencies) to be recognized as income tax expense or benefit in the income statement. The amount of excess tax benefits (net of tax deficiencies) recognized as a reduction to income tax expense totaled $7.3 million in 2017. In addition, income tax benefits of $11.8 million were recorded in 2017, resulting from the contribution of $32.0 million of appreciated securities to a charitable foundation.

New federal tax reform legislation was enacted in December 2017, which reduced income tax rates applied to the Company's deferred tax assets and liabilities at December 31, 2017. As part of the enactment, tax benefits of $6.8 million were recorded as a reduction of income tax expense in 2017, mostly as a result of revaluing deferred tax assets and liabilities at the new lower tax rates. The Company’s effective tax rate in 2018 is likely to be reduced to a range of 19-21% as a result of this new tax legislation. Additional information about income tax expense is provided in Note 8 to the consolidated financial statements.

Financial Condition

Loan Portfolio Analysis

Classifications of consolidated loans by major category at December 31 for each of the past five years are shown in the table below. This portfolio consists of loans which were acquired or originated with the intent of holding to their maturity. Loans held for sale are separately discussed in a following section. A schedule of average balances invested in each loan category below appears on page 56.

	Balance at December 31
(In thousands)	2017		2016		2015		2014		2013
Commercial:
Business	$	4,958,554	$	4,776,365	$	4,397,893	$	3,969,952	$	3,715,319
Real estate — construction and land	968,820		791,236		624,070		403,507		406,197
Real estate — business	2,697,452		2,643,374		2,355,544		2,288,215		2,313,550
Personal banking:
Real estate — personal	2,062,787		2,010,397		1,915,953		1,883,092		1,787,626
Consumer	2,104,487		1,990,801		1,924,365		1,705,134		1,512,716
Revolving home equity	400,587		413,634		432,981		430,873		420,589
Consumer credit card	783,864		776,465		779,744		782,370		796,228
Overdrafts	7,123		10,464		6,142		6,095		4,611
Total loans	$	13,983,674	$	13,412,736	$	12,436,692	$	11,469,238	$	10,956,836

The contractual maturities of business and real estate loan categories at December 31, 2017, and a breakdown of those loans between fixed rate and floating rate loans are as follows.

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	Principal Payments Due
(In thousands)	In One Year or Less			After One Year Through Five Years			After Five Years			Total
Business	$	2,581,850		$	1,943,129		$	433,575		$	4,958,554
Real estate — construction and land	383,983			550,930			33,907			968,820
Real estate — business	598,587			1,507,896			590,969			2,697,452
Real estate — personal	181,223			506,033			1,375,531			2,062,787
Total business and real estate loans	$	3,745,643		$	4,507,988		$	2,433,982		10,687,613
Business and real estate loans:
Loans with fixed rates	24.3		%	49.6		%	58.2		%	42.7		%
Loans with floating rates	75.7		%	50.4		%	41.8		%	57.3		%
Total business and real estate loans	100.0		%	100.0		%	100.0		%	100.0		%

The following table shows loan balances at December 31, 2017, segregated between those with fixed interest rates and those with variable rates that fluctuate with an index.

(In thousands)	Fixed Rate Loans		Variable Rate Loans		Total		% Variable Rate Loans
Business	$	1,727,430	$	3,231,124	$	4,958,554	65.2	%
Real estate — construction and land	64,884		903,936		968,820		93.3
Real estate — business	1,275,537		1,421,915		2,697,452		52.7
Real estate — personal	1,497,030		565,757		2,062,787		27.4
Consumer	1,561,174		543,313		2,104,487		25.8
Revolving home equity	7,830		392,757		400,587		98.0
Consumer credit card	70,392		713,472		783,864		91.0
Overdrafts	7,123		—		7,123		—
Total loans	$	6,211,400	$	7,772,274	$	13,983,674	55.6	%

Total loans at December 31, 2017 were $14.0 billion, an increase of $570.9 million, or 4.3%, over balances at December 31, 2016. The growth in loans during 2017 occurred in all loan categories, with the exception of revolving home equity loans and overdrafts, which declined from the prior year. Business loans increased $182.2 million, or 3.8%, reflecting growth in commercial and industrial loans, commercial card loans and tax-advantaged lending. Business real estate loans increased $54.1 million, or 2.0%, due to continued demand for commercial real estate loans during 2017. Construction loans increased $177.6 million, or 22.4% due to continued growth in commercial construction projects and advances on existing projects.Personal real estate loans retained by the Company increased $52.4 million, or 2.6%, on solid origination growth. The Company sells certain long-term fixed rate mortgage loans to the secondary market, and these loan sales totaled $199.8 million in 2017.Consumer loans were higher by $113.7 million, or 5.7%, which was largely driven by growth in patient health care, automobile and other consumer loans, while motorcycle and fixed rate home equity loans declined and marine and recreational vehicle loan balances continued to run off during the year. Consumer credit card loans increased $7.4 million, while revolving home equity loan balances declined $13.0 million, compared to balances at year end 2016.

The Company currently holds approximately 29% of its loan portfolio in the St. Louis market, 31% in the Kansas City market, and 40% in other regional markets. The portfolio is diversified from a business and retail standpoint, with 62% in loans to businesses and 38% in loans to consumers. A balanced approach to loan portfolio management and an historical aversion toward credit concentrations, from an industry, geographic and product perspective, have contributed to low levels of problem loans and loan losses.

The Company participates in credits of large, publicly traded companies which are defined by regulation as shared national credits, or SNCs. Regulations define SNCs as loans exceeding $20 million that are shared by three or more financial institutions. The Company typically participates in these loans when business operations are maintained in the local communities or regional markets and opportunities to provide other banking services are present. At December 31, 2017, the balance of SNC loans totaled approximately $1.1 billion, with an additional $1.4 billion in unfunded commitments, compared to $836.1 million in loans and $1.4 billion in unfunded commitments at December 31, 2016.

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Commercial Loans

Business

Total business loans amounted to $5.0 billion at December 31, 2017 and include loans used mainly to fund customer accounts receivable, inventories, and capital expenditures. The business loan portfolio includes tax-advantaged financings which carry tax free interest rates. These loans totaled $728.9 million at December 31, 2017, which was a $53.5 million, or 7.9%, increase over December 31, 2016 balances, and comprised 5.2% of the Company's total loan portfolio. The business loan portfolio also includes direct financing and sales type leases totaling $737.7 million, which are used by commercial and tax-exempt customers to finance capital purchases ranging from computer equipment to office and transportation equipment. These leases increased $12.4 million, or 1.7%, over 2016 and comprised 5.3% of the Company’s total loan portfolio. The Company has outstanding energy-related loans totaling $134.5 million at December 31, 2017, which are further discussed on page 38. Also included in the business portfolio are corporate card loans, which totaled $300.8 million at December 31, 2017 and increased $76.6 million, or 34.1%, over the prior year. These loans are made in conjunction with the Company’s corporate card business. They are generally for corporate trade purchases and are short-term, with outstanding balances averaging between 7 to 30 days in duration, which helps to limit risk in these loans.

Business loans, excluding corporate card loans, are made primarily to customers in the regional trade area of the Company, generally the central Midwest, encompassing the states of Missouri, Kansas, Illinois, and nearby Midwestern markets, including Iowa, Oklahoma, Colorado, Texas and Ohio. This portfolio is diversified from an industry standpoint and includes businesses engaged in manufacturing, wholesaling, retailing, agribusiness, insurance, financial services, public utilities, health care, and other service businesses. Emphasis is upon middle-market and community businesses with known local management and financial stability. Consistent with management’s strategy and emphasis upon relationship banking, most borrowing customers also maintain deposit accounts and utilize other banking services. Net loan charge-offs in this category totaled $1.4 million in 2017, compared to net loan charge-offs of $616 thousand recorded in 2016. Non-accrual business loans were $5.9 million (.1% of business loans) at December 31, 2017 compared to $8.7 million at December 31, 2016.

Real Estate-Construction and Land

The portfolio of loans in this category amounted to $968.8 million at December 31, 2017, which was an increase of $177.6 million, or 22.4%, over the prior year and comprised 6.9% of the Company’s total loan portfolio. Commercial construction and land development loans totaled $765.8 million, or 79.0% of total construction loans at December 31, 2017. These loans increased $193.3 million over 2016 year end balances; driving the growth in the total construction portfolio. Commercial construction loans are made during the construction phase for small and medium-sized office and medical buildings, manufacturing and warehouse facilities, apartment complexes, shopping centers, hotels and motels, and other commercial properties. Commercial land development loans relate to land owned or developed for use in conjunction with business properties. Residential construction and land development loans at December 31, 2017 totaled $203.0 million, or 21.0% of total construction loans. A stable construction market has contributed to improved loss trends, with net loan recoveries of $1.2 million and $3.7 million recorded in 2017 and 2016, respectively. Construction and land loans on non-accrual status declined to $5 thousand at year end 2017 compared to $564 thousand at year end 2016.

Real Estate-Business

Total business real estate loans were $2.7 billion at December 31, 2017 and comprised 19.3% of the Company’s total loan portfolio. This category includes mortgage loans for small and medium-sized office and medical buildings, manufacturing and warehouse facilities, shopping centers, hotels and motels, churches, and other commercial properties. Emphasis is placed on owner-occupied lending (37.5% of this portfolio), which presents lower risk levels. The borrowers and/or the properties are generally located in local and regional markets. Additional information about loans by category is presented on page 36. At December 31, 2017, non-accrual balances amounted to $2.7 million, or .1% of the loans in this category, up from $1.6 million at year end 2016. The Company experienced net loan recoveries of $203 thousand in 2017, compared to net loan recoveries of $1.3 million in 2016.

Personal Banking Loans

Real Estate-Personal

At December 31, 2017, there were $2.1 billion in outstanding personal real estate loans, which comprised 14.8% of the Company’s total loan portfolio. The mortgage loans in this category are mainly for owner-occupied residential properties. The Company originates both adjustable rate and fixed rate mortgage loans, and at December 31, 2017, 27% of the portfolio was comprised of adjustable rate loans and 73% was comprised of fixed rate loans. The Company does not purchase any loans from outside parties or brokers, and has never maintained or promoted subprime or reduced-document products. Levels of mortgage loan origination activity decreased in 2017 compared to 2016, with originations of $560.8 million in 2017 compared with $574.7

30

million in 2016. Net loans retained by the Company increased $52.4 million and loans sold to the secondary market increased $50.2 million. The loan sales were made under a 2015 initiative to originate and sell certain long term fixed rate loans, resulting in sales of $149.6 million in 2016 and $199.8 million in 2017. The Company has experienced lower loan losses in this category than many others in the industry and believes this is partly because of its conservative underwriting culture, stable markets, and the fact that it does not offer subprime lending products or purchase loans from brokers. Net loan recoveries for 2017 amounted to $305 thousand, compared to net loan recoveries of $6 thousand in the previous year. The non-accrual balances of loans in this category decreased to $2.5 million at December 31, 2017, compared to $3.4 million at year end 2016.

Consumer

Consumer loans consist of automobile, motorcycle, marine, tractor/trailer, recreational vehicle (RV), fixed rate home equity, patient health care financing and other types of consumer loans. These loans totaled $2.1 billion at year end 2017. Approximately 48% of the consumer portfolio consists of automobile loans, 6% in motorcycle loans, 15% in fixed rate home equity loans, 7% in heathcare financing loans and 3% in marine and RV loans. Total consumer loans increased by $113.7 million at year end in 2017 compared to year end 2016. Growth of $69.6 million in patient health care financing and $37.3 million in automobile loan originations was partly offset by the run-off of $30.6 million in marine and RV loans and lower motorcycle and fixed rate home equity loans of $10.9 million and $8.7 million, respectively. Loans for other general consumer purposes increased $57.0 million over year end 2016. Net charge-offs on total consumer loans were $10.0 million in 2017, compared to $9.0 million in 2016, averaging .5% of consumer loans in both years. Consumer loan net charge-offs included marine and RV loan net charge-offs of $1.2 million, which were 1.4% of average marine and RV loans in 2017, compared to .9% in 2016.

Revolving Home Equity

Revolving home equity loans, of which 98% are adjustable rate loans, totaled $400.6 million at year end 2017. An additional $698.6 million was available in unused lines of credit, which can be drawn at the discretion of the borrower. Home equity loans are secured mainly by second mortgages (and less frequently, first mortgages) on residential property of the borrower. The underwriting terms for the home equity line product permit borrowing availability, in the aggregate, generally up to 80% or 90% of the appraised value of the collateral property at the time of origination. Net charge-offs totaled $185 thousand in 2017, compared to $485 thousand in 2016.

Consumer Credit Card

Total consumer credit card loans amounted to $783.9 million at December 31, 2017 and comprised 5.6% of the Company’s total loan portfolio. The credit card portfolio is concentrated within regional markets served by the Company. The Company offers a variety of credit card products, including affinity cards, rewards cards, and standard and premium credit cards, and emphasizes its credit card relationship product, Special Connections. Approximately 42% of the households that own a Commerce credit card product also maintain a deposit relationship with the subsidiary bank. At December 31, 2017, approximately 91% of the outstanding credit card loan balances had a floating interest rate, compared to 90% in the prior year. Net charge-offs amounted to $30.3 million in 2017, an increase of $4.8 million over $25.4 million in 2016. The ratio of credit card loan net charge-offs to total average credit card loans was 4.1% in 2017 and 3.4% in 2016.

Loans Held for Sale

At December 31, 2017, loans held for sale were comprised of certain long-term fixed rate personal real estate loans and loans extended to students while attending colleges and universities. The personal real estate loans are carried at fair value and totaled $15.3 million at December 31, 2017. The student loans, carried at the lower of cost or fair value, totaled $6.1 million at December 31, 2017. Both of these portfolios are further discussed in Note 2 to the consolidated financial statements.

Allowance for Loan Losses

The Company has an established process to determine the amount of the allowance for loan losses which assesses the risks and losses inherent in its portfolio. This process provides an allowance consisting of a specific allowance component based on certain individually evaluated loans and a general component based on estimates of reserves needed for pools of loans.

Loans subject to individual evaluation generally consist of business, construction, business real estate and personal real estate loans on non-accrual status, and include troubled debt restructurings that are on non-accrual status. These non-accrual loans are evaluated individually for impairment based on factors such as payment history, borrower financial condition and collateral. For collateral dependent loans, appraisals of collateral (including exit costs) are normally obtained annually but discounted based on date last received and market conditions. From these evaluations of expected cash flows and collateral values, specific allowances are determined.

31

Loans which are not individually evaluated are segregated by loan type and sub-type and are collectively evaluated. These loans include commercial loans (business, construction and business real estate) which have been graded pass, special mention or substandard, and all personal banking loans except personal real estate loans on non-accrual status. Collectively-evaluated loans include certain troubled debt restructurings with similar risk characteristics. Allowances for both personal banking and commercial loans use methods which consider historical and current loss trends, loss emergence periods, delinquencies, industry concentrations and unique risks. Economic conditions throughout the Company's market place, as monitored by Company credit officers, are also considered in the allowance determination process.

The Company’s estimate of the allowance for loan losses and the corresponding provision for loan losses rest upon various judgments and assumptions made by management. In addition to past loan loss experience, various qualitative factors are considered, such as current loan portfolio composition and characteristics, trends in delinquencies, portfolio risk ratings, levels of non-performing assets, credit concentrations, collateral values, and prevailing regional and national economic conditions. The Company has internal credit administration and loan review staff that continuously review loan quality and report the results of their reviews and examinations to the Company’s senior management and Board of Directors. Such reviews also assist management in establishing the level of the allowance. In using this process and the information available, management must consider various assumptions and exercise considerable judgment to determine the overall level of the allowance for loan losses. Because of these subjective factors, actual outcomes of inherent losses can differ from original estimates. The Company’s subsidiary bank continues to be subject to examination by several regulatory agencies, and examinations are conducted throughout the year, targeting various segments of the loan portfolio for review. Refer to Note 1 to the consolidated financial statements for additional discussion on the allowance and charge-off policies.

At December 31, 2017, the allowance for loan losses was $159.5 million compared to $155.9 million at December 31, 2016. The percentage of allowance to loans decreased slightly to 1.14% at December 31, 2017 compared to 1.16% at year end 2016. Total loans delinquent 90 days or more and still accruing were $18.1 million at December 31, 2017, an increase of $1.7 million compared to year end 2016, mainly driven by a $1.2 million increase in personal real estate loans delinquent 90 days or more. Non-accrual loans at December 31, 2017 were $12.0 million, a decrease of $2.3 million from the prior year, mainly comprised of decreases in business and personal real estate non-accrual loans of $2.7 million and $942 thousand, respectively. These decreases were partially offset by an increase in business real estate non-accrual loans of $1.1 million. The 2017 year end balance of non-accrual loans was comprised of $5.9 million of business loans, $2.7 million of business real estate loans, $2.5 million of personal real estate loans, and $834 thousand of consumer loans.

Net loan charge-offs totaled $41.6 million in 2017, representing a $9.7 million increase compared to net charge-offs of $31.9 million in 2016. The increase was largely due to lower recoveries on commercial loans, which saw $5.1 million fewer recoveries in 2017 compared to 2016, as well as $4.8 million and $932 thousand higher net charge-offs on consumer credit card and consumer loans, respectively. Partly offsetting these increases in net charge-offs were lower net loan charge-offs on revolving home equity and personal real estate loans. Consumer credit card net charge-offs were 4.07% of average consumer credit card loans in 2017 compared to 3.39% in 2016. Consumer credit card loan net charge-offs as a percentage of total net charge-offs decreased to 72.6% in 2017 compared to 79.7% in 2016. Consumer loan net charge-offs were .49% of average consumer loans in 2017, compared to .46% in 2016, and represented 24.0% of total net loan charge-offs in 2017.

The ratio of net charge-offs to total average loans outstanding in 2017 was .31%, compared to .25% in 2016 and .28% in 2015. The provision for loan losses in 2017 was $45.2 million, compared to provisions of $36.3 million in 2016 and $28.7 million in 2015.

The Company considers the allowance for loan losses of $159.5 million adequate to cover losses inherent in the loan portfolio at December 31, 2017.

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The schedules which follow summarize the relationship between loan balances and activity in the allowance for loan losses:

	Years Ended December 31
(Dollars in thousands)	2017			2016			2015			2014			2013
Loans outstanding at end of year(A)	$	13,983,674		$	13,412,736		$	12,436,692		$	11,469,238		$	10,956,836
Average loans outstanding(A)	$	13,611,699		$	12,927,778		$	11,869,276		$	11,260,233		$	10,311,654
Allowance for loan losses:
Balance at beginning of year	$	155,932		$	151,532		$	156,532		$	161,532		$	172,532
Additions to allowance through charges to expense	45,244			36,318			28,727			29,531			20,353
Loans charged off:
Business	2,410			2,549			2,295			2,646			1,869
Real estate — construction and land	1			515			499			794			621
Real estate — business	127			194			1,263			1,108			2,680
Real estate — personal	417			556			1,037			844			1,570
Consumer	13,415			12,711			11,708			12,214			11,029
Revolving home equity	488			860			722			783			1,200
Consumer credit card	36,114			31,616			31,326			32,424			33,206
Overdrafts	2,207			1,977			2,200			1,960			2,024
Total loans charged off	55,179			50,978			51,050			52,773			54,199
Recoveries of loans previously charged off:
Business	1,032			1,933			2,683			2,181			2,736
Real estate — construction and land	1,192			4,227			1,761			2,323			5,313
Real estate — business	330			1,475			1,396			681			1,728
Real estate — personal	722			562			596			317			343
Consumer	3,436			3,664			3,430			3,409			3,489
Revolving home equity	303			375			320			743			214
Consumer credit card	5,861			6,186			6,287			7,702			8,085
Overdrafts	659			638			850			886			938
Total recoveries	13,535			19,060			17,323			18,242			22,846
Net loans charged off	41,644			31,918			33,727			34,531			31,353
Balance at end of year	$	159,532		$	155,932		$	151,532		$	156,532		$	161,532
Ratio of allowance to loans at end of year	1.14		%	1.16		%	1.22		%	1.36		%	1.47		%
Ratio of provision to average loans outstanding	.33		%	.28		%	.24		%	.26		%	.20		%

(A) Net of unearned income, before deducting allowance for loan losses, excluding loans held for sale.

	Years Ended December 31
	2017		2016		2015		2014		2013
Ratio of net charge-offs (recoveries) to average loans outstanding, by loan category:
Business	.03	%	.01	%	(.01	)%	.01	%	(.03	)%
Real estate — construction and land	(.14	)	(.48	)	(.26	)	(.37	)	(1.24	)
Real estate — business	(.01	)	(.05	)	(.01	)	.02		.04
Real estate — personal	(.02	)	—		.02		.03		.07
Consumer	.49		.46		.45		.54		.52
Revolving home equity	.05		.12		.09		.01		.23
Consumer credit card	4.07		3.39		3.35		3.28		3.34
Overdrafts	33.71		28.42		24.93		21.97		18.04
Ratio of total net charge-offs to total average loans outstanding	.31	%	.25	%	.28	%	.31	%	.30	%

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The following schedule provides a breakdown of the allowance for loan losses by loan category and the percentage of each loan category to total loans outstanding at year end.

(Dollars in thousands)	2017				2016				2015				2014				2013
	Loan Loss Allowance Allocation		% of Loans to Total Loans		Loan Loss Allowance Allocation		% of Loans to Total Loans		Loan Loss Allowance Allocation		% of Loans to Total Loans		Loan Loss Allowance Allocation		% of Loans to Total Loans		Loan Loss Allowance Allocation		% of Loans to Total Loans
Business	$	44,462	35.4	%	$	43,910	35.6	%	$	43,617	35.4	%	$	40,881	34.6	%	$	43,146	33.9	%
RE — construction and land	24,432		6.9		21,841		5.9		16,312		5.0		13,584		3.5		18,617		3.7
RE — business	24,810		19.3		25,610		19.7		22,157		18.9		35,157		20.0		32,426		21.1
RE — personal	4,201		14.8		4,110		15.0		6,680		15.4		7,343		16.4		4,490		16.3
Consumer	19,509		15.0		18,935		14.8		21,717		15.5		16,822		14.9		15,440		13.8
Revolving home equity	1,189		2.9		1,164		3.1		1,393		3.5		2,472		3.7		3,152		3.8
Consumer credit card	40,052		5.6		39,530		5.8		38,764		6.3		39,541		6.8		43,360		7.3
Overdrafts	877		.1		832		.1		892		—		732		.1		901		.1
Total	$	159,532	100.0	%	$	155,932	100.0	%	$	151,532	100.0	%	$	156,532	100.0	%	$	161,532	100.0	%

Risk Elements of Loan Portfolio

Management reviews the loan portfolio continuously for evidence of problem loans. During the ordinary course of business, management becomes aware of borrowers that may not be able to meet the contractual requirements of loan agreements. Such loans are placed under close supervision with consideration given to placing the loan on non-accrual status, the need for an additional allowance for loan loss, and (if appropriate) partial or full loan charge-off. Loans are placed on non-accrual status when management does not expect to collect payments consistent with acceptable and agreed upon terms of repayment. After a loan is placed on non-accrual status, any interest previously accrued but not yet collected is reversed against current income. Interest is included in income only as received and only after all previous loan charge-offs have been recovered, so long as management is satisfied there is no impairment of collateral values. The loan is returned to accrual status only when the borrower has brought all past due principal and interest payments current, and, in the opinion of management, the borrower has demonstrated the ability to make future payments of principal and interest as scheduled. Loans that are 90 days past due as to principal and/or interest payments are generally placed on non-accrual, unless they are both well-secured and in the process of collection, or they are comprised of those personal banking loans that are exempt under regulatory rules from being classified as non-accrual. Consumer installment loans and related accrued interest are normally charged down to the fair value of related collateral (or are charged off in full if no collateral) once the loans are more than 120 days delinquent. Credit card loans and the related accrued interest are charged off when the receivable is more than 180 days past due.

The following schedule shows non-performing assets and loans past due 90 days and still accruing interest.

	December 31
(Dollars in thousands)	2017			2016			2015			2014			2013
Total non-accrual loans	$	11,983		$	14,283		$	26,575		$	40,775		$	48,814
Real estate acquired in foreclosure	681			366			2,819			5,476			6,625
Total non-performing assets	$	12,664		$	14,649		$	29,394		$	46,251		$	55,439
Non-performing assets as a percentage of total loans	.09		%	.11		%	.24		%	.40		%	.51		%
Non-performing assets as a percentage of total assets	.05		%	.06		%	.12		%	.19		%	.24		%
Loans past due 90 days and still accruing interest	$	18,127		$	16,396		$	16,467		$	13,658		$	13,966

The table below shows the effect on interest income in 2017 of loans on non-accrual status at year end.

(In thousands)
Gross amount of interest that would have been recorded at original rate	$	1,067
Interest that was reflected in income	58
Interest income not recognized	$	1,009

Non-accrual loans, which are also classified as impaired, totaled $12.0 million at year end 2017, a decrease of $2.3 million from the balance at year end 2016. The decline from December 31, 2016 occurred mainly in business, personal real estate, and construction loans, which decreased $2.7 million, $942 thousand, and $559 thousand, respectively, but was partially offset by increases in business real estate and consumer non-accrual loans. At December 31, 2017, non-accrual loans were comprised primarily of business (49.6%), business real estate (22.8%), and personal real estate (20.5%) loans. Foreclosed real estate totaled $681 thousand at December 31, 2017, an increase of $315 thousand when compared to December 31, 2016. Total non-performing

34

assets remain low compared to the overall banking industry in 2017, with the non-performing loans to total loans ratio at .09% at December 31, 2017. Total loans past due 90 days or more and still accruing interest were $18.1 million as of December 31, 2017, an increase of $1.7 million when compared to December 31, 2016. Balances by class for non-accrual loans and loans past due 90 days and still accruing interest are shown in the "Delinquent and non-accrual loans" section of Note 2 to the consolidated financial statements.

In addition to the non-performing and past due loans mentioned above, the Company also has identified loans for which management has concerns about the ability of the borrowers to meet existing repayment terms. They are classified as substandard under the Company’s internal rating system. The loans are generally secured by either real estate or other borrower assets, reducing the potential for loss should they become non-performing. Although these loans are generally identified as potential problem loans, they may never become non-performing. Such loans totaled $213.4 million at December 31, 2017, compared with $99.5 million at December 31, 2016, resulting in an increase of $113.9 million. The change in potential problem loans was largely comprised of an increase of $110.0 million in business loans, mainly due to the downgrade of several large commercial and industrial and lease loans.

	December 31
(In thousands)	2017		2016
Potential problem loans:
Business	$	153,417	$	43,438
Real estate – construction and land	2,702		1,172
Real estate – business	51,134		52,913
Real estate – personal	6,121		1,955
Total potential problem loans	$	213,374	$	99,478

At December 31, 2017, the Company had $110.6 million of loans whose terms have been modified or restructured under a troubled debt restructuring. These loans have been extended to borrowers who are experiencing financial difficulty and who have been granted a concession, as defined by accounting guidance, and are further discussed in the "Troubled debt restructurings" section in Note 2 to the consolidated financial statements. This balance includes certain commercial loans totaling $88.6 million which are classified as substandard and included in the table above because of this classification.

Loans with Special Risk Characteristics

Management relies primarily on an internal risk rating system, in addition to delinquency status, to assess risk in the loan portfolio, and these statistics are presented in Note 2 to the consolidated financial statements. However, certain types of loans are considered at high risk of loss due to their terms, location, or special conditions. Construction and land loans and business real estate loans are subject to higher risk because of the impact that volatile interest rates and a changing economy can have on real estate value, and because of the potential volatility of the real estate industry. Certain personal real estate products (residential first mortgages and home equity loans) have contractual features that could increase credit exposure in a market of declining real estate prices, when interest rates are steadily increasing, or when a geographic area experiences an economic downturn. For these personal real estate loans, higher risks could exist when 1) loan terms require a minimum monthly payment that covers only interest, or 2) loan-to-collateral value (LTV) ratios at origination are above 80%, with no private mortgage insurance. Information presented below for personal real estate and home equity loans is based on LTV ratios which were calculated with valuations at loan origination date. The Company does not attempt to obtain updated appraisals or valuations unless the loans become significantly delinquent or are in the process of being foreclosed upon. For credit monitoring purposes, the Company relies on delinquency monitoring along with obtaining refreshed FICO scores, and in the case of home equity loans, reviewing line utilization and credit bureau information annually. This has remained an effective means of evaluating credit trends and identifying problem loans, partly because the Company offers standard, conservative lending products.

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Real Estate - Construction and Land Loans

The Company’s portfolio of construction loans, as shown in the table below, amounted to 6.9% of total loans outstanding at December 31, 2017. The largest component of construction and land loans was commercial construction, which grew $213.9 million during the year ended December 31, 2017. At December 31, 2017, multi-family residential construction loans totaled approximately $252.8 million, or 35.2%, of the commercial construction loan portfolio.

(Dollars in thousands)	December 31, 2017		% of Total		% of Total Loans		December 31, 2016		% of Total		% of Total Loans
Residential land  and land development	$	81,859	8.5	%	.6	%	$	86,373	10.9	%	.6	%
Residential construction	121,138		12.5		.9		132,334		16.8		1.0
Commercial land  and land development	48,474		5.0		.3		69,057		8.7		.5
Commercial construction	717,349		74.0		5.1		503,472		63.6		3.8
Total real estate – construction and land loans	$	968,820	100.0	%	6.9	%	$	791,236	100.0	%	5.9	%

Real Estate – Business Loans

Total business real estate loans were $2.7 billion at December 31, 2017 and comprised 19.3% of the Company’s total loan portfolio. These loans include properties such as manufacturing and warehouse buildings, small office and medical buildings, churches, hotels and motels, shopping centers, and other commercial properties. Approximately 37.5% of these loans were for owner-occupied real estate properties, which present lower risk profiles.

(Dollars in thousands)	December 31, 2017		% of Total		% of Total Loans		December 31, 2016		% of Total		% of Total Loans
Owner-occupied	$	1,010,786	37.5	%	7.2	%	$	1,004,238	38.0	%	7.5	%
Office	373,301		13.8		2.7		319,638		12.1		2.4
Retail	338,937		12.6		2.4		344,221		13.0		2.5
Multi-family	298,605		11.1		2.1		255,369		9.7		1.9
Hotels	181,704		6.7		1.3		174,207		6.6		1.3
Farm	161,972		6.0		1.2		173,210		6.6		1.3
Industrial	73,078		2.7		.5		122,940		4.6		.9
Other	259,069		9.6		1.9		249,551		9.4		1.9
Total real estate - business loans	$	2,697,452	100.0	%	19.3	%	$	2,643,374	100.0	%	19.7	%

Real Estate - Personal Loans

The Company’s $2.1 billion personal real estate loan portfolio is composed mainly of residential first mortgage real estate loans. The majority of this portfolio is comprised of approximately $1.9 billion of loans made to the retail customer base and includes both adjustable rate and fixed rate mortgage loans. As shown in Note 2 to the consolidated financial statements, 3.4% of this portfolio has FICO scores of less than 660, and delinquency levels have been low. Loans of approximately $29.9 million in this personal real estate portfolio were structured with interest only payments. Interest only loans are typically made to high net-worth borrowers and generally have low LTV ratios at origination or have additional collateral pledged to secure the loan. Therefore, they are not perceived to represent above normal credit risk. Loans originated with interest only payments were not made to "qualify" the borrower for a lower payment amount.  A small portion of the total portfolio is comprised of personal real estate loans made to individuals employed by commercial customers which totaled $219.2 million at December 31, 2017.

36

The following table presents information about the retail-based personal real estate loan portfolio for 2017 and 2016.

	2017				2016
(Dollars in thousands)	Principal Outstanding at December 31		% of Loan Portfolio		Principal Outstanding at December 31		% of Loan Portfolio
Loans with interest only payments	$	29,919	1.6	%	$	22,185	1.2	%
Loans with no insurance and LTV:
Between 80% and 90%	110,272		5.9		95,708		5.4
Between 90% and 95%	28,774		1.6		29,323		1.6
Over 95%	44,529		2.4		33,778		1.9
Over 80% LTV with no insurance	183,575		9.9		158,809		8.9
Total loan portfolio from which above loans were identified	1,855,779				1,783,674

Revolving Home Equity Loans

The Company also has revolving home equity loans that are generally collateralized by residential real estate. Most of these loans (92.3%) are written with terms requiring interest only monthly payments. These loans are offered in three main product lines: LTV up to 80%, 80% to 90%, and 90% to 100%. As shown in the following tables, the percentage of loans with LTV ratios greater than 80% has remained a small segment of this portfolio, and delinquencies have been low and stable. The weighted average FICO score for the total current portfolio balance is 794. At maturity, the accounts are re-underwritten and if they qualify under the Company's credit, collateral and capacity policies, the borrower is given the option to renew the line of credit or to convert the outstanding balance to an amortizing loan.  If criteria are not met, amortization is required, or the borrower may pay off the loan. Over the next three years, approximately 14% of the Company's current outstanding balances are expected to mature. Of these balances, 92% have a FICO score above 700. The Company does not expect a significant increase in losses as these loans mature, due to their high FICO scores, low LTVs, and low historical loss levels.

(Dollars in thousands)	Principal Outstanding at December 31, 2017		*		New Lines Originated During 2017		*		Unused Portion of Available Lines at December 31, 2017		*		Balances Over 30 Days Past Due		*
Loans with interest only payments	$	369,846	92.3	%		$160,111	40.0	%		$680,826	170.0	%		$2,977	.7	%
Loans with LTV:
Between 80% and 90%	43,493		10.9		19,537		4.9		40,750		10.2		514		.1
Over 90%	7,849		1.9		—		—		5,452		1.3		85		—
Over 80% LTV	51,342		12.8		19,537		4.9		46,202		11.5		599		.1
Total loan portfolio from which above loans were identified	400,587				172,511				713,934

* Percentage of total principal outstanding of $400.6 million at December 31, 2017.

(Dollars in thousands)	Principal Outstanding at December 31, 2016		*		New Lines Originated During 2016		*		Unused Portion of Available Lines at December 31, 2016		*		Balances Over 30 Days Past Due		*
Loans with interest only payments	$	385,617	93.2	%		$174,892	42.3	%		$663,594	160.4	%		$1,912	.5	%
Loans with LTV:
Between 80% and 90%	46,633		11.3		21,263		5.1		39,069		9.4		540		.1
Over 90%	8,443		2.0		2,036		.5		7,251		1.8		106		.1
Over 80% LTV	55,076		13.3		23,299		5.6		46,320		11.2		646		.2
Total loan portfolio from which above loans were identified	413,634				184,250				694,767

* Percentage of total principal outstanding of $413.6 million at December 31, 2016.

37

Other Consumer Loans

Within the consumer loan portfolio are several direct and indirect product lines comprised mainly of loans secured by automobiles, motorcycles, marine, and RVs. Outstanding balances for auto loans were $1.0 billion and $972.5 million at December 31, 2017 and 2016, respectively. The balances over 30 days past due amounted to $18.4 million at December 31, 2017, compared to $13.8 million at the end of 2016, and comprised 1.8% of the outstanding balances of these loans at December 31, 2017 compared to 1.4% at December 31, 2016. For the year ended December 31, 2017, $464.3 million of new auto loans were originated, compared to $431.0 million during 2016. At December 31, 2017, the automobile loan portfolio had a weighted average FICO score of 751.

Outstanding balances for motorcycle loans were $129.5 million at December 31, 2017, compared to $140.4 million at December 31, 2016. The balances over 30 days past due amounted to $2.5 million and $2.2 million at December 31, 2017 and 2016, respectively, and comprised 1.9% of the outstanding balances of these loans at December 31, 2017, compared to 1.5% at December 31, 2016. For the year ended December 31, 2017, $55.3 million of new motorcycle loans were originated, compared to $76.4 million during 2016.

Marine and RV loan production has been significantly curtailed since 2008 with few new originations. While loss rates have remained low over the last five years, the loss ratios experienced for marine and RV loans in 2017 increased over the prior year and have been higher than for other consumer loan products, at 1.4% and .9% in 2017 and 2016, respectively. Balances over 30 days past due for marine and RV loans decreased $3.3 million at year end 2017 compared to 2016. The table below provides the total outstanding principal and other data for this group of direct and indirect lending products at December 31, 2017 and 2016.

	2017						2016
(In thousands)	Principal Outstanding at December 31		New Loans Originated		Balances Over 30 Days Past Due		Principal Outstanding at December 31		New Loans Originated		Balances Over 30 Days Past Due
Automobiles	$	1,009,880	$	464,253	$	18,396	$	972,536	$	431,048	$	13,839
Motorcycles	129,530		55,253		2,496		140,408		76,364		2,155
Marine	17,776		997		846		26,187		1,629		953
RV	54,070		29		109		76,254		1,187		3,307
Total	$	1,211,256	$	520,532	$	21,847	$	1,215,385	$	510,228	$	20,254

Additionally, the Company offers low promotional rates on selected consumer credit card products. Out of a portfolio atDecember 31, 2017 of $783.9 million in consumer credit card loans outstanding, approximately $167.9 million, or 21.4%, carried a low promotional rate. Within the next six months, $50.2 million of these loans are scheduled to convert to the ongoing higher contractual rate. To mitigate some of the risk involved with this credit card product, the Company performs credit checks and detailed analysis of the customer borrowing profile before approving the loan application. Management believes that the risks in the consumer loan portfolio are reasonable and the anticipated loss ratios are within acceptable parameters.

Energy Lending

The Company's energy lending portfolio was comprised of lending to the petroleum and natural gas sectors and totaled $134.5 million at December 31, 2017, a decrease of $37.0 million from year end 2016, as shown in the table below.

(In thousands)	December 31, 2017		December 31, 2016		Unfunded commitments at December 31, 2017
Extraction	$	86,040	$	103,011	$	51,647
Downstream distribution and refining	25,329		30,231		18,247
Mid-stream shipping and storage	9,310		22,985		72,149
Support activities	13,811		15,296		23,651
Total energy lending portfolio	$	134,490	$	171,523	$	165,694

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Investment Securities Analysis

Investment securities are comprised of securities which are classified as available for sale, non-marketable, or trading. Total investment securities (excluding unrealized gains/losses in fair value) decreased 9.1% during 2017 to $8.8 billion at year end 2017. During 2017, securities of $1.9 billion were purchased in the available for sale and non-marketable portfolios, which included $407.8 million in asset-backed securities, $995.9 million in agency mortgage-backed securities and $169.1 million in non-agency mortgage-backed securities. Total sales, maturities and pay downs in these portfolios were $2.7 billion during 2017. During 2018, maturities and pay downs of approximately $1.4 billion are expected to occur. The average tax equivalent yield earned on total investment securities was 2.52% in 2017 and 2.43% in 2016.

At December 31, 2017, the fair value of available for sale securities was $8.8 billion, including a net unrealized gain in fair value of $54.4 million, compared to a net unrealized gain of $48.9 million at December 31, 2016. The overall unrealized gain in fair value at December 31, 2017 included net gains of $18.7 million in state and municipal securities and $44.3 million in equity securities held by the Parent, partially offset by net losses of $5.8 million in agency mortgage-backed securities.

Available for sale investment securities at year end for the past two years are shown below:

	December 31
(In thousands)	2017		2016
Amortized Cost
U.S. government and federal agency obligations	$	917,494	$	919,904
Government-sponsored enterprise obligations	408,266		450,448
State and municipal obligations	1,592,707		1,778,684
Agency mortgage-backed securities	3,046,701		2,674,964
Non-agency mortgage-backed securities	903,920		1,054,446
Asset-backed securities	1,495,380		2,389,176
Other debt securities	350,988		327,030
Equity securities	4,411		5,678
Total available for sale investment securities	$	8,719,867	$	9,600,330
Fair Value
U.S. government and federal agency obligations	$	917,147	$	920,904
Government-sponsored enterprise obligations	406,363		449,998
State and municipal obligations	1,611,366		1,778,214
Agency mortgage-backed securities	3,040,913		2,685,931
Non-agency mortgage-backed securities	905,793		1,055,639
Asset-backed securities	1,492,800		2,381,301
Other debt securities	351,060		325,953
Equity securities	48,838		51,263
Total available for sale investment securities	$	8,774,280	$	9,649,203

The available for sale portfolio includes agency mortgage-backed securities, which are collateralized bonds issued by agencies, including FNMA, GNMA, FHLMC, FHLB, Federal Farm Credit Banks and FDIC. Non-agency mortgage-backed securities totaled $905.8 million, at fair value, at December 31, 2017, and included $582.4 million collateralized by commercial mortgages and $323.4 million collateralized by residential mortgages. Certain non-agency mortgage-backed securities are other-than-temporarily impaired, and the processes for determining impairment and the related losses are discussed in Note 3 to the consolidated financial statements.

At December 31, 2017, U.S. government obligations included $442.1 million in TIPS, and state and municipal obligations included $17.0 million in auction rate securities, at fair value. Other debt securities include corporate bonds, notes and commercial paper. Available for sale equity securities are mainly comprised of common stock held by the Parent which totaled $45.9 million at December 31, 2017.

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The types of debt securities held in the available for sale security portfolio at year end 2017 are presented in the table below. Additional detail by maturity category is provided in Note 3 to the consolidated financial statements.

	December 31, 2017
	Percent of Total Debt Securities		Weighted Average Yield		Estimated Average Maturity*
Available for sale debt securities:
U.S. government and federal agency obligations	10.5	%	1.24	%	4.2	years
Government-sponsored enterprise obligations	4.7		1.79		2.9
State and municipal obligations	18.4		2.39		5.0
Agency mortgage-backed securities	34.9		2.62		4.1
Non-agency mortgage-backed securities	10.4		2.54		2.9
Asset-backed securities	17.1		2.03		2.4
Other debt securities	4.0		2.59		4.6

*Based on call provisions and estimated prepayment speeds.

Non-marketable securities totaled $100.8 million at December 31, 2017 and $99.6 million at December 31, 2016. These include Federal Reserve Bank stock and Federal Home Loan Bank (Des Moines) stock held by the bank subsidiary in accordance with debt and regulatory requirements. These are restricted securities and are carried at cost. Also included are private equity investments, most of which are held by a subsidiary qualified as a Small Business Investment Company. These investments are carried at estimated fair value, but are not readily marketable. While the nature of these investments carries a higher degree of risk than the normal lending portfolio, this risk is mitigated by the overall size of the investments and oversight provided by management, and management believes the potential for long-term gains in these investments outweighs the potential risks.

Non-marketable securities at year end for the past two years are shown below:

	December 31
(In thousands)	2017		2016
Federal Reserve Bank stock	$	33,253	$	32,929
Federal Home Loan Bank stock	10,000		14,000
Private equity investments in debt securities	31,734		27,258
Private equity investments in equity securities	25,474		25,076
Other equity securities	297		295
Total non-marketable investment securities	$	100,758	$	99,558

In addition to its holdings in the investment securities portfolio, the Company invests in long-term securities purchased under agreements to resell, which totaled $700.0 million at December 31, 2017 and $725.0 million at December 31, 2016. These investments mature in 2019 through 2021 and have fixed rates or variable rates that fluctuate with published indices. The counterparties to these agreements are other financial institutions from whom the Company has accepted collateral of $712.9 million in marketable investment securities at December 31, 2017. The average rate earned on these agreements during 2017 was 1.72%.

The Company also holds offsetting repurchase and resale agreements totaling $650.0 million at December 31, 2017 and $550.0 million at December 31, 2016, which are further discussed in Note 18 to the consolidated financial statements. These agreements involve the exchange of collateral under simultaneous repurchase and resale agreements with the same financial institution counterparty. These repurchase and resale agreements have been offset against each other in the balance sheet, as permitted under current accounting guidance. The agreements mature in 2018 through 2019 and earned an average of 53 basis points during 2017.

Deposits and Borrowings

Deposits are the primary funding source for the Bank and are acquired from a broad base of local markets, including both individual and corporate customers. Total deposits were $20.4 billion at December 31, 2017, compared to $21.1 billion last year, reflecting a decrease of $675.6 million, or 3.2%. Most of this decline occurred in the second and third quarters of 2017.

Average deposits grew by $263.9 million, or 1.3%, in 2017 compared to 2016, with most of this growth occurring in money market deposits, which grew $196.5 million, or 2.0%. Interest checking and savings deposits also increased over the prior year, while total certificates of deposits declined $139.6 million, or 6.3%. Non-interest bearing deposits increased on average by $126.6

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million, or 1.8%, driven by growth in government and personal demand deposits but partially offset by a decline in business demand deposits.

The following table shows year end deposits by type as a percentage of total deposits.

	December 31
	2017		2016
Non-interest bearing	35.1	%	35.2	%
Savings, interest checking and money market	56.3		54.2
Time open and C.D.’s of less than $100,000	3.1		3.4
Time open and C.D.’s of $100,000 and over	5.5		7.2
Total deposits	100.0	%	100.0	%

Core deposits, which include non-interest bearing, interest checking, savings, and money market deposits, supported 77% of average earning assets in both 2017 and 2016. Average balances by major deposit category for the last six years appear on page 56. A maturity schedule of time deposits outstanding at December 31, 2017 is included in Note 6 on Deposits in the consolidated financial statements.

The Company’s primary sources of overnight borrowings are federal funds purchased and securities sold under agreements to repurchase (repurchase agreements). Balances in these accounts can fluctuate significantly on a day-to-day basis and generally have one day maturities. Total balances of federal funds purchased and repurchase agreements outstanding at December 31, 2017 were $1.5 billion, a $216.8 million decrease from the $1.7 billion balance outstanding at year end 2016. On an average basis, these borrowings increased $196.3 million, or 15.5%, during 2017, mainly due to an increase of $201.8 million in repurchase agreements. The average rate paid on total federal funds purchased and repurchase agreements was .67% during 2017 and .26% during 2016.

The majority of the Company’s long-term debt has been comprised of fixed rate advances from the FHLB. These advances, which totaled $100.0 million at December 31, 2016, were repaid by the Company in November 2017. The average rate paid on FHLB advances was 3.55% and 2.32% during 2017 and 2016, respectively.

Liquidity and Capital Resources

Liquidity Management

Liquidity is managed within the Company in order to satisfy cash flow requirements of deposit and borrowing customers while at the same time meeting its own cash flow needs. The Company has taken numerous steps to address liquidity risk and has developed a variety of liquidity sources which it believes will provide the necessary funds for future growth. The Company manages its liquidity position through a variety of sources including:

• A portfolio of liquid assets including marketable investment securities and overnight investments,

• A large customer deposit base and limited exposure to large, volatile certificates of deposit,

• Lower long-term borrowings that might place demands on Company cash flow,

• Relatively low loan to deposit ratio promoting strong liquidity,

• Excellent debt ratings from both Standard & Poor’s and Moody’s national rating services, and

• Available borrowing capacity from outside sources.

The Company’s most liquid assets include available for sale marketable investment securities, federal funds sold, balances at the Federal Reserve Bank, and securities purchased under agreements to resell. At December 31, 2017 and 2016, such assets were as follows:

(In thousands)	2017		2016
Available for sale investment securities	$	8,774,280	$	9,649,203
Federal funds sold	42,775		15,470
Long-term securities purchased under agreements to resell	700,000		725,000
Balances at the Federal Reserve Bank	30,631		272,275
Total	$	9,547,686	$	10,661,948

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Federal funds sold are funds lent to the Company’s correspondent bank customers with overnight maturities, and totaled $42.8 million at December 31, 2017. At December 31, 2017, the Company had lent funds totaling $700.0 million under long-term resale agreements to other large financial institutions. The agreements mature in years 2019 through 2021. Under these agreements, the Company holds marketable securities, safekept by a third-party custodian, as collateral. This collateral totaled $712.9 million in fair value at December 31, 2017. Interest earning balances at the Federal Reserve Bank, which have overnight maturities and are used for general liquidity purposes, totaled $30.6 million at December 31, 2017. The Company’s available for sale investment portfolio includes scheduled maturities and expected pay downs of approximately $1.4 billion during 2018, and these funds offer substantial resources to meet either new loan demand or help offset reductions in the Company’s deposit funding base. The Company pledges portions of its investment securities portfolio to secure public fund deposits, repurchase agreements, trust funds, letters of credit issued by the FHLB, and borrowing capacity at the Federal Reserve Bank. At December 31, 2017 and 2016, total investment securities pledged for these purposes were as follows:

(In thousands)	2017		2016
Investment securities pledged for the purpose of securing:
Federal Reserve Bank borrowings	$	84,946	$	115,858
FHLB borrowings and letters of credit	13,332		17,781
Repurchase agreements *	2,001,401		2,447,835
Other deposits	1,679,024		1,773,017
Total pledged securities	3,778,703		4,354,491
Unpledged and available for pledging	3,346,826		3,516,648
Ineligible for pledging	1,648,751		1,778,064
Total available for sale securities, at fair value	$	8,774,280	$	9,649,203

* Includes securities pledged for collateral swaps, as discussed in Note 18 to the consolidated financial statements

Liquidity is also available from the Company’s large base of core customer deposits, defined as non-interest bearing, interest checking, savings, and money market deposit accounts. At December 31, 2017, such deposits totaled $18.7 billion and represented 91.3% of the Company’s total deposits. These core deposits are normally less volatile, often with customer relationships tied to other products offered by the Company promoting long lasting relationships and stable funding sources. Total core deposits decreased $201.6 million at year end 2017 compared to year end 2016, with declines of $108.7 million in corporate core deposits and $251.6 million in private banking deposits, offset by growth of $194.0 million in consumer deposits. The Company does not consider the decline in core deposits to be significant, but should the decline in deposits continue in 2018, future funding requirements will be met by the liquidity supplied by investment security maturities and pay downs, expected to total $1.4 billion over the next year, as noted above. In addition, as shown on page 43, the Company has borrowing capacity of $3.4 billion through advances from the FHLB and the Federal Reserve.

(In thousands)	2017		2016
Core deposit base:
Non-interest bearing	$	7,158,962	$	7,429,398
Interest checking	1,533,904		1,275,899
Savings and money market	9,965,716		10,154,890
Total	$	18,658,582	$	18,860,187

Time open and certificates of deposit of $100,000 or greater totaled $1.1 billion at December 31, 2017. These deposits are normally considered more volatile and higher costing, and comprised 5.5% of total deposits at December 31, 2017.

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Other important components of liquidity are the level of borrowings from third party sources and the availability of future credit. The Company’s outside borrowings are mainly comprised of federal funds purchased, repurchase agreements, and advances from the FHLB, as follows:

(In thousands)	2017		2016
Borrowings:
Federal funds purchased	$	202,370	$	52,840
Repurchase agreements	1,304,768		1,671,065
FHLB advances	—		100,000
Other long-term debt	1,758		2,049
Total	$	1,508,896	$	1,825,954

Federal funds purchased, which totaled $202.3 million at December 31, 2017, are unsecured overnight borrowings obtained mainly from upstream correspondent banks with which the Company maintains approved lines of credit. Retail repurchase agreements are offered to customers wishing to earn interest in highly liquid balances and are used by the Company as a funding source considered to be stable, but short-term in nature. Repurchase agreements are collateralized by securities in the Company’s investment portfolio. Total repurchase agreements at December 31, 2017 were comprised of non-insured customer funds totaling $1.3 billion, and securities pledged for these retail agreements totaled $1.3 billion. The Company's remaining FHLB advances matured in 2017, bringing the long-term debt position to nearly zero.

The Company pledges certain assets, including loans and investment securities, to both the Federal Reserve Bank and the FHLB as security to establish lines of credit and borrow from these entities. Based on the amount and type of collateral pledged, the FHLB establishes a collateral value from which the Company may draw advances against the collateral. Additionally, this collateral is used to enable the FHLB to issue letters of credit in favor of public fund depositors of the Company. The Federal Reserve Bank also establishes a collateral value of assets pledged and permits borrowings from the discount window. The following table reflects the collateral value of assets pledged, borrowings, and letters of credit outstanding, in addition to the estimated future funding capacity available to the Company at December 31, 2017.

	December 31, 2017
(In thousands)	FHLB			Federal Reserve		Total
Total collateral value pledged	$	2,566,135		$	1,347,778	$	3,913,913
Advances outstanding	—			—		—
Letters of credit issued	(498,410		)	—		(498,410		)
Available for future advances	$	2,067,725		$	1,347,778	$	3,415,503

The Company’s average loans to deposits ratio was 66.2% at December 31, 2017, which is considered in the banking industry to be a measure of strong liquidity. Also, the Company receives outside ratings from both Standard & Poor’s and Moody’s on both the consolidated company and its subsidiary bank, Commerce Bank. These ratings are as follows:

	Standard & Poor’s	Moody’s
Commerce Bancshares, Inc.
Issuer rating	A-
Preferred stock	BBB-	Baa1
Rating outlook	Stable	Stable
Commerce Bank
Issuer rating	A	A2
Baseline credit assessment		a1
Short-term rating	A-1	P-1
Rating outlook	Stable	Stable

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The Company considers these ratings to be indications of a sound capital base and strong liquidity and believes that these ratings would help ensure the ready marketability of its commercial paper, should the need arise. No commercial paper has been outstanding during the past ten years. The Company has no subordinated or hybrid debt instruments which would affect future borrowing capacity. Because of its lack of significant long-term debt, the Company believes that, through its Capital Markets Group or in other public debt markets, it could generate additional liquidity from sources such as jumbo certificates of deposit, privately-placed corporate notes or other forms of debt.

The cash flows from the operating, investing and financing activities of the Company resulted in a net decrease in cash and cash equivalents of $270.6 million in 2017, as reported in the consolidated statements of cash flows on page 64 of this report. Operating activities, consisting mainly of net income adjusted for certain non-cash items, provided cash flow of $433.2 million and has historically been a stable source of funds. Investing activities provided total cash of $220.7 million, mainly from sales and maturities (net of purchases) of available for sale investment securities, offset by an increase in the loan portfolio. Activity in the investment securities portfolio provided cash of $838.2 million, while growth in the loan portfolio used cash of $614.8 million. Net repayments of long-term resale agreements provided additional cash of $25.0 million. Investing activities are somewhat unique to financial institutions in that, while large sums of cash flow are normally used to fund growth in investment securities, loans, or other bank assets, they are normally dependent on the financing activities described below.

During 2017, financing activities used total cash of $924.5 million, primarily resulting from a $489.1 million decrease in deposits, a $216.8 decrease in borrowings of federal funds purchased and repurchase agreements, and a $100.0 million decline in FHLB borrowings. Cash dividend payments of $100.6 million were paid on common and preferred stock, while treasury stock purchases totaled $17.8 million. Future short-term liquidity needs for daily operations are not expected to vary significantly, and the Company believes it maintains adequate liquidity to meet these cash flows. The Company’s sound equity base, along with its low debt level, common and preferred stock availability, and excellent debt ratings, provide several alternatives for future financing. Future acquisitions may utilize partial funding through one or more of these options.

Cash flows resulting from the Company’s transactions in its common and preferred stock were as follows:

(In millions)	2017			2016			2015
Exercise of stock-based awards	$	—		$	—		$	1.9
Purchases of treasury stock	(17.8		)	(39.4		)	(23.2		)
Accelerated share repurchase agreements	—			—			(100.0		)
Common cash dividends paid	(91.6		)	(87.1		)	(85.0		)
Preferred cash dividends paid	(9.0		)	(9.0		)	(9.0		)
Cash used	$	(118.4	)	$	(135.5	)	$	(215.3	)

The Parent faces unique liquidity constraints due to legal limitations on its ability to borrow funds from its bank subsidiary. The Parent obtains funding to meet its obligations from two main sources: dividends received from bank and non-bank subsidiaries (within regulatory limitations) and management fees charged to subsidiaries as reimbursement for services provided by the Parent, as presented below:

(In millions)	2017		2016		2015
Dividends received from subsidiaries	$	160.0	$	160.0	$	160.0
Management fees	30.4		31.0		25.7
Total	$	190.4	$	191.0	$	185.7

These sources of funds are used mainly to pay cash dividends on outstanding stock, pay general operating expenses, and purchase treasury stock. At December 31, 2017, the Parent’s available for sale investment securities totaled $53.3 million at fair value, consisting of common and preferred stock and non-agency backed collateralized mortgage obligations. To support its various funding commitments, the Parent maintains a $20.0 million line of credit with its subsidiary bank. There were no borrowings outstanding under the line during 2017 or 2016.

Company senior management is responsible for measuring and monitoring the liquidity profile of the organization with oversight by the Company’s Asset/Liability Committee. This is done through a series of controls, including a written Contingency Funding Policy and risk monitoring procedures, which include daily, weekly and monthly reporting. In addition, the Company prepares forecasts to project changes in the balance sheet affecting liquidity and to allow the Company to better plan for forecasted changes.

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Capital Management

Under Basel III capital guidelines, at December 31, 2017 and 2016, the Company met all capital adequacy requirements and had regulatory capital ratios in excess of the levels established for well-capitalized institutions, as shown in the following table.

(Dollars in thousands)	2017			2016			Minimum Ratios under Capital Adequacy Guidelines*		Minimum Ratios for Well-Capitalized Banks**
Risk-adjusted assets	$	19,149,949		$	18,994,730
Tier I common risk-based capital	2,422,480			2,207,370
Tier I risk-based capital	2,567,264			2,352,154
Total risk-based capital	2,747,863			2,529,675
Tier I common risk-based capital ratio	12.65		%	11.62		%	7.00	%	6.50	%
Tier I risk-based capital ratio	13.41			12.38			8.50		8.00
Total risk-based capital ratio	14.35			13.32			10.50		10.00
Tier I leverage ratio	10.39			9.55			4.00		5.00
Tangible common equity to tangible assets	9.84			8.66
Dividend payout ratio	29.52			32.69

* as of the fully phased-in date of Jan. 1, 2019, including capital conservation buffer

**under Prompt Corrective Action requirements

The Company maintains a treasury stock buyback program under authorizations by its Board of Directors and periodically purchases stock in the open market. During 2015, the Company purchased 4.2 million shares, comprised of 3.6 million shares purchased under accelerated share repurchase agreements and 535 thousand shares acquired through market purchases. During 2016 and 2017, respectively, the Company purchased 959 thousand and 315 thousand shares through market purchases. At December 31, 2017, 3.4 million shares remained available for purchase under the current Board authorization.

The Company’s common stock dividend policy reflects its earnings outlook, desired payout ratios, the need to maintain adequate capital levels and alternative investment options. Per share cash dividends paid by the Company increased 5% in 2017 compared with 2016, and the Company increased its first quarter 2018 cash dividend by nearly 10%. The Company also distributed its 24th consecutive annual 5% stock dividend in December 2017.

Commitments, Contractual Obligations, and Off-Balance Sheet Arrangements

In the normal course of business, various commitments and contingent liabilities arise which are not required to be recorded on the balance sheet. The most significant of these are loan commitments totaling $10.8 billion (including approximately $5.1 billion in unused approved credit card lines) and the contractual amount of standby letters of credit totaling $387.8 million at December 31, 2017. As many commitments expire unused or only partially used, these totals do not necessarily reflect future cash requirements. Management does not anticipate any material losses arising from commitments or contingent liabilities and believes there are no material commitments to extend credit that represent risks of an unusual nature.

A table summarizing contractual cash obligations of the Company at December 31, 2017 and the expected timing of these payments follows:

	Payments Due by Period
(In thousands)	In One Year or Less		After One Year Through Three Years		After Three Years Through Five Years		After Five Years		Total
Long-term debt obligations*	$	300	$	633	$	668	$	157	$	1,758
Operating lease obligations	6,196		8,844		5,854		13,383		34,277
Purchase obligations	69,273		107,859		62,837		5,471		245,440
Time open and C.D.’s *	1,414,554		290,754		59,504		2,052		1,766,864
Total	$	1,490,323	$	408,090	$	128,863	$	21,063	$	2,048,339

* Includes principal payments only.

The Company funds a defined benefit pension plan for a portion of its employees. Under the funding policy for the plan, contributions are made as necessary to provide for current service and for any unfunded accrued actuarial liabilities over a reasonable

45

period. During 2017, the Company made a discretionary contribution of $5.5 million to its defined benefit pension plan in order to reduce pension guarantee premiums. However, the Company is not required nor does it expect to make a contribution in 2018.

The Company has investments in several low-income housing partnerships within the areas it serves. These partnerships supply funds for the construction and operation of apartment complexes that provide affordable housing to that segment of the population with lower family income. If these developments successfully attract a specified percentage of residents falling in that lower income range, federal (and sometimes state) income tax credits are made available to the partners. The tax credits are normally recognized over ten years, and they play an important part in the anticipated yield from these investments. In order to continue receiving the tax credits each year over the life of the partnership, the low-income residency targets must be maintained. Under the terms of the partnership agreements, the Company has a commitment to fund a specified amount that will be due in installments over the life of the agreements, which ranges from 10 to 15 years. At December 31, 2017, the investments totaled $36.5 million and are recorded as other assets in the Company’s consolidated balance sheet. Unfunded commitments, which are recorded as liabilities, amounted to $27.4 million at December 31, 2017.

The Company regularly purchases various state tax credits arising from third-party property redevelopment. These credits are either resold to third parties or retained for use by the Company. During 2017, purchases and sales of tax credits amounted to $70.9 million and $47.1 million, respectively. Fees from the sales of tax credits were $3.3 million, $3.1 million and $2.2 million in 2017, 2016 and 2015, respectively. At December 31, 2017, the Company had outstanding purchase commitments totaling $114.9 million that it expects to fund in 2018.

Interest Rate Sensitivity

The Company’s Asset/Liability Management Committee (ALCO) measures and manages the Company’s interest rate risk on a monthly basis to identify trends and establish strategies to maintain stability in net interest income throughout various rate environments. Analytical modeling techniques provide management insight into the Company’s exposure to changing rates. These techniques include net interest income simulations and market value analysis. Management has set guidelines specifying acceptable limits within which net interest income and market value may change under various rate change scenarios. These measurement tools indicate that the Company is currently within acceptable risk guidelines as set by management.

The Company’s main interest rate measurement tool, income simulations, projects net interest income under various rate change scenarios in order to quantify the magnitude and timing of potential rate-related changes. Income simulations are able to capture option risks within the balance sheet where expected cash flows may be altered under various rate environments. Modeled rate movements include “shocks, ramps and twists.” Shocks are intended to capture interest rate risk under extreme conditions by immediately shifting rates up and down, while ramps measure the impact of gradual changes and twists measure yield curve risk. The size of the balance sheet is assumed to remain constant so that results are not influenced by growth predictions.

The Company also employs a sophisticated simulation technique known as a stochastic income simulation. This technique allows management to see a range of results from hundreds of income simulations. The stochastic simulation creates a vector of potential rate paths around the market’s best guess (forward rates) concerning the future path of interest rates and allows rates to randomly follow paths throughout the vector. This allows for the modeling of non-biased rate forecasts around the market consensus. Results give management insight into a likely range of rate-related risk as well as worst and best-case rate scenarios.

Additionally, the Company uses market value analyses to help identify longer-term risks that may reside on the balance sheet. This is considered a secondary risk measurement tool by management. The Company measures the market value of equity as the net present value of all asset and liability cash flows discounted along the current swap curve plus appropriate market risk spreads. It is the change in the market value of equity under different rate environments, or effective duration, that gives insight into the magnitude of risk to future earnings due to rate changes. Market value analyses also help management understand the price sensitivity of non-marketable bank products under different rate environments.

The tables below compute the effects of gradual rising interest rates over a twelve month period on the Company’s net interest income, assuming a static balance sheet with the exception of deposit attrition. The difference between the two simulations is the amount of deposit attrition incorporated, which is shown in the tables below. In both simulations, three rising rate scenarios were selected as shown in the tables, and net interest income was calculated and compared to a base scenario in which assets, liabilities and rates remained constant over a twelve month period.  For each of the simulations, interest rates applicable to each interest earning asset or interest bearing liability were ratably increased during the year (by either 100, 200 or 300 basis points).  The balances contained in the balance sheet were assumed not to change over the twelve month period, except that as presented in the tables below, it was assumed certain non-maturity type deposit attrition would occur, as a result of higher interest rates, and would be replaced with short-term federal funds borrowings. 

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The simulations reflect two different assumptions related to deposit attrition. The Company utilizes these simulations both for monitoring interest rate risk and for liquidity planning purposes. While the future effects of rising rates on deposit balances cannot be known, the Company maintains a practice of running multiple rate scenarios to better understand interest rate risk and its effect on the Company’s performance.  The Company believes that its approach to interest rate risk has appropriately considered its susceptibility to both rising rates and falling rates and has adopted strategies which minimize impacts to overall interest rate risk.

Simulation A	December 31, 2017							September 30, 2017
(Dollars in millions)	$ Change in Net Interest Income		% Change in Net Interest Income		Assumed Deposit Attrition			$ Change in Net Interest Income		% Change in Net Interest Income		Assumed Deposit Attrition
300 basis points rising	$	3.4	.45	%	$	(346.2	)	$	10.4	1.41	%	$	(356.9	)
200 basis points rising	6.2		.82		(241.8		)	10.7		1.45		(246.5		)
100 basis points rising	4.9		.65		(124.3		)	7.1		.96		(125.7		)

Simulation B	December 31, 2017								September 30, 2017
(Dollars in millions)	$ Change in Net Interest Income			% Change in Net Interest Income		Assumed Deposit Attrition			$ Change in Net Interest Income			% Change in Net Interest Income		Assumed Deposit Attrition
300 basis points rising	$	(18.0	)	(2.36	)%	$	(1,060.3	)	$	(10.8	)	(1.45	)%	$	(1,122.0	)
200 basis points rising	(12.3		)	(1.62	)	(956.9		)	(7.3		)	(.98	)	(1,013.2		)
100 basis points rising	(10.7		)	(1.40	)	(841.5		)	(7.6		)	(1.03	)	(895.2		)

The difference in these two simulations is the degree to which deposits are modeled to decline as noted in the above table. Both simulations assume that a decline in deposits would be offset by increased short-term borrowings, which are more rate sensitive and can result in higher interest costs in a rising rate environment.  Under Simulation A, a gradual increase in interest rates of 100 basis points is expected to increase net interest income from the base calculation by $4.9 million, while a gradual increase in rates of 200 basis points would increase net interest income by $6.2 million.  An increase in rates of 300 basis points would result in an increase in net interest income of $3.4 million. As rates rise, the increase in net interest income from the base calculation at December 31, 2017 was lower than projections made at September 30, 2017 largely due to higher rates and balances of federal funds purchased and repurchase agreements and higher rates on deposits, which increased interest expense and lowered net interest income projections for the fourth quarter of 2017 compared to the prior quarter. In addition, interest income projected on investment securities at December 31, 2017 declined when compared to projections at September 30, 2017, due to lower investment securities balances and fewer variable rate securities, making the portfolio less rate sensitive in a rising rate environment.

Under Simulation B, the same assumptions utilized in Simulation A were applied. However, in Simulation B, deposit attrition was accelerated to consider the effects that large deposit outflows might have on net interest income and liquidity planning purposes.  The effect of higher deposit attrition was that greater reliance was placed on short-term borrowings at higher rates, which are more rate sensitive.  As shown in the table, under these assumptions, net interest income in Simulation B was significantly lower than in Simulation A, reflecting higher costs for short-term borrowings.

Projecting deposit activity in a historically low interest rate environment is difficult, and the Company cannot predict how deposits will react to rising rates.  The comparison provided above provides insight into potential effects of changes in rates and deposit levels on net interest income.

Derivative Financial Instruments

The Company maintains an overall interest rate risk management strategy that permits the use of derivative instruments to modify exposure to interest rate risk. The Company’s interest rate risk management strategy includes the ability to modify the re-pricing characteristics of certain assets and liabilities so that changes in interest rates do not adversely affect the net interest margin and cash flows. Interest rate swaps may be used on a limited basis as part of this strategy. The Company also sells interest rate swap contracts to customers who wish to modify their interest rate sensitivity. The Company offsets the interest rate risk of these swaps by purchasing matching contracts with offsetting pay/receive rates from other financial institutions. These paired swap contracts comprised the Company's swap portfolio at December 31, 2017 with a total notional amount of $1.7 billion.

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Credit risk participation agreements arise when the Company contracts, as a guarantor or beneficiary, with other financial institutions to share credit risk associated with certain interest rate swaps. These agreements provide for reimbursement of losses resulting from a third party default on the underlying swap.

The Company enters into foreign exchange derivative instruments as an accommodation to customers and offsets the related foreign exchange risk by entering into offsetting third-party forward contracts with approved, reputable counterparties. This trading activity is managed within a policy of specific controls and limits. The foreign exchange contracts outstanding at December 31, 2017 mature within the next one to nine months.

The Company began selling new originations of certain long-term residential mortgage loans in early 2015. Derivative instruments arising from this activity include mortgage loan commitments and forward loan sale contracts. Changes in the fair values of the loan commitments and funded loans prior to sale that are due to changes in interest rates are economically hedged with forward contracts to sell residential mortgage-backed securities in the to-be-announced (TBA) market. These TBA forward contracts, which are settled in cash at the security settlement date, are also derivatives.

In all of these contracts, the Company is exposed to credit risk in the event of nonperformance by counterparties, who may be bank customers or other financial institutions. The Company controls the credit risk of its financial contracts through credit approvals, limits and monitoring procedures. Because the Company generally enters into transactions only with high quality counterparties, there have been no losses associated with counterparty nonperformance on derivative financial instruments.

The following table summarizes the notional amounts and estimated fair values of the Company’s derivative instruments at December 31, 2017 and 2016. Notional amount, along with the other terms of the derivative, is used to determine the amounts to be exchanged between the counterparties. Because the notional amount does not represent amounts exchanged by the parties, it is not a measure of loss exposure related to the use of derivatives nor of exposure to liquidity risk.

	2017							2016
(In thousands)	Notional Amount		Positive Fair Value		Negative Fair Value			Notional Amount		Positive Fair Value		Negative Fair Value
Interest rate swaps	$	1,741,412	$	7,674	$	(7,857	)	$	1,685,099	$	12,987	$	(12,987	)
Interest rate caps	31,776		16		(16		)	59,379		78		(78		)
Credit risk participation agreements	133,488		46		(123		)	121,514		65		(156		)
Foreign exchange contracts	11,826		21		(40		)	4,046		66		(4		)
Mortgage loan commitments	17,110		580		—			12,429		355		(6		)
Mortgage loan forward sale contracts	2,566		8		(7		)	6,626		—		(63		)
Forward TBA contracts	25,000		4		(31		)	15,000		15		(45		)
Total at December 31	$	1,963,178	$	8,349	$	(8,074	)	$	1,904,093	$	13,566	$	(13,339	)

Operating Segments

The Company segregates financial information for use in assessing its performance and allocating resources among three operating segments. The results are determined based on the Company’s management accounting process, which assigns balance sheet and income statement items to each responsible segment. These segments are defined by customer base and product type. The management process measures the performance of the operating segments based on the management structure of the Company and is not necessarily comparable with similar information for any other financial institution. Each segment is managed by executives who, in conjunction with the Chief Executive Officer, make strategic business decisions regarding that segment. The three reportable operating segments are Consumer, Commercial and Wealth. Additional information is presented in Note 12 on Segments in the consolidated financial statements.

The Company uses a funds transfer pricing method to value funds used (e.g., loans, fixed assets, cash, etc.) and funds provided (deposits, borrowings, and equity) by the business segments and their components. This process assigns a specific value to each new source or use of funds with a maturity, based on current swap rates, thus determining an interest spread at the time of the transaction. Non-maturity assets and liabilities are valued using weighted average pools. The funds transfer pricing process attempts to remove interest rate risk from valuation, allowing management to compare profitability under various rate environments. The Company also assigns loan charge-offs and recoveries (labeled in the table below as “provision for loan losses”) directly to each operating segment instead of allocating an estimated loan loss provision. The operating segments also include a number of allocations of income and expense from various support and overhead centers within the Company.

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The table below is a summary of segment pre-tax income results for the past three years.

(Dollars in thousands)	Consumer			Commercial			Wealth			Segment Totals			Other/Elimination			Consolidated Totals
Year ended December 31, 2017:
Net interest income	$	279,031		$	328,345		$	47,264		$	654,640		$	79,039		$	733,679
Provision for loan losses	(41,829		)	205			(41		)	(41,665		)	(3,579		)	(45,244		)
Non-interest income	136,554			194,581			158,175			489,310			(2,706		)	486,604
Investment securities gains, net	—			—			—			—			25,051			25,051
Non-interest expense	(290,905		)	(290,874		)	(120,458		)	(702,237		)	(67,447		)	(769,684		)
Income before income taxes	$	82,851		$	232,257		$	84,940		$	400,048		$	30,358		$	430,406
Year ended December 31, 2016:
Net interest income	$	268,654		$	311,704		$	44,113		$	624,471		$	55,578		$	680,049
Provision for loan losses	(36,042		)	4,378			(122		)	(31,786		)	(4,532		)	(36,318		)
Non-interest income	131,988			199,384			144,661			476,033			(1,641		)	474,392
Investment securities losses, net	—			—			—			—			(53		)	(53		)
Non-interest expense	(282,061		)	(284,432		)	(113,888		)	(680,381		)	(36,684		)	(717,065		)
Income before income taxes	$	82,539		$	231,034		$	74,764		$	388,337		$	12,668		$	401,005
2017 vs 2016
Increase in income before income taxes:
Amount	$	312		$	1,223		$	10,176		$	11,711		$	17,690		$	29,401
Percent	.4		%	.5		%	13.6		%	3.0		%	N.M.			7.3		%
Year ended December 31, 2015:
Net interest income	$	266,328		$	296,510		$	42,653		$	605,491		$	28,829		$	634,320
Provision for loan losses	(34,864		)	1,032			75			(33,757		)	5,030			(28,727		)
Non-interest income	119,561			194,133			136,374			450,068			(1,929		)	448,139
Investment securities gains, net	—			—			—			—			6,320			6,320
Non-interest expense	(273,378		)	(267,343		)	(108,755		)	(649,476		)	(27,011		)	(676,487		)
Income before income taxes	$	77,647		$	224,332		$	70,347		$	372,326		$	11,239		$	383,565
2016 vs 2015
Increase in income before income taxes:
Amount	$	4,892		$	6,702		$	4,417		$	16,011		$	1,429		$	17,440
Percent	6.3		%	3.0		%	6.3		%	4.3		%	12.7		%	4.5		%

Consumer

The Consumer segment includes consumer deposits, consumer finance, and consumer debit and credit cards. During 2017, income before income taxes for the Consumer segment increased $312 thousand, or .4%, compared to 2016. This increase was mainly due to growth of $10.4 million, or 3.9%, in net interest income and an increase in non-interest income of $4.6 million, or 3.5%. Net interest income increased due to a $9.7 million increase in net allocated funding credits assigned to the Consumer segment's loan and deposit portfolios and a $670 thousand increase in loan interest income. Non-interest income increased mainly due to growth in deposit fees (mainly deposit account service fees and overdraft and return item fees) and bank card fees. These increases to income were partly offset by growth of $8.8 million, or 3.1%, in non-interest expense and $5.8 million in the provision for loan losses. Non-interest expense increased over the prior year due to an increase in full-time salaries expense and higher allocated support costs, mainly administrative, online banking and information technology. These increases were partly offset by lower bank card processing costs, mainly the result of a new vendor contract negotiated in the third quarter of 2017, while bank card rewards expense was higher. In addition, supplies expense decreased due to higher chip card reissue costs last year that have now declined. The provision for loan losses totaled $41.8 million, a $5.8 million increase over the prior year, which was mainly due to higher net charge-offs on consumer credit card loans. Total average loans in this segment decreased $62.0 million, or 2.4%, in 2017 compared to the prior year mainly due to a decline in marine and RV loans. Average deposits increased $234.3 million, or 2.4%, over the prior year, resulting from growth in money market deposit accounts, partly offset by a decline in certificate of deposit balances.

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Pre-tax profitability for 2016 was $82.5 million, an increase of $4.9 million, or 6.3%, compared to 2015. This increase was mainly due to growth of $2.3 million in net interest income and an increase in non-interest income of $12.4 million, or 10.4%. Net interest income increased due to a $4.3 million increase in net allocated funding credits, partly offset by a $2.2 million decline in loan interest income. Non-interest income increased due to growth in mortgage banking revenue, deposit account service fees and bank card fees. These increases to income were partly offset by growth of $8.7 million, or 3.2%, in non-interest expense and $1.2 million in the provision for loan losses. Non-interest expense increased over the prior year due to higher bank card processing costs, bank card rewards expense, and supplies expense. Supplies expense increased over the prior year largely due to higher reissuance costs for new chip cards distributed to customers. In addition, higher costs were incurred for allocated support and servicing, while bank card fraud losses declined from the prior year. The provision for loan losses totaled $36.0 million, a $1.2 million increase over the prior year, which was mainly due to higher net charge-offs on credit card and other consumer loans, partly offset by lower marine and RV loan net charge-offs. Total average loans in this segment increased $33.5 million, or 1.3%, in 2016 compared to the prior year due to growth in auto lending, partly offset by declines in marine and RV loans. Average deposits increased $288.4 million, or 3.0%, over the prior year, resulting from growth in money market deposit accounts, partly offset by lower balances in certificates of deposit.

Commercial

The Commercial segment provides corporate lending (including the Small Business Banking product line within the branch network), leasing, international services, and business, government deposit, and related commercial cash management services, as well as merchant and commercial bank card products. The segment includes the Capital Markets Group, which sells fixed-income securities to individuals, corporations, correspondent banks, public institutions, and municipalities, and also provides investment safekeeping and bond accounting services. Pre-tax income for 2017 increased $1.2 million, or .5%, compared to 2016, mainly due to an increase in net interest income, partly offset by lower non-interest income, higher non-interest expense and an increase in the provision for loan losses. Net interest income increased $16.6 million, or 5.3%, due to growth of $45.9 million in loan interest income, partly offset by a decrease of $18.5 million in net allocated funding credits. In addition, customer repurchase agreement interest expense increased $5.5 million and deposit interest expense increased $5.2 million. The provision for loan losses increased $4.2 million over last year, as construction loan and business real estate loan net recoveries were lower by $2.5 million and $1.1 million, respectively. Non-interest income decreased $4.8 million, or 2.4%, from the previous year due to lower interest rate swap fees and capital market fees. Non-interest expense increased $6.4 million, or 2.3%, during 2017, mainly due to increases in full-time salaries expense and allocated support costs, partly offset by lower bank card processing costs. Average segment loans increased $562.5 million, or 7.0%, compared to 2016, with growth occurring in commercial and industrial, construction, and business real estate loans. Average deposits increased $57.6 million, or .7%, due to growth in governmental demand deposit accounts, partly offset by declines in certificates of deposit, money market deposit accounts, and business demand deposits.

In 2016, pre-tax income increased $6.7 million, or 3.0%, compared to 2015, mainly due to increases in net interest income and non-interest income, partly offset by higher non-interest expense. Net interest income increased $15.2 million, or 5.1%, due to growth of $34.6 million in loan interest income, partly offset by a decrease of $14.3 million in net allocated funding credits and higher deposit interest expense of $3.7 million. The provision for loan losses decreased $3.3 million from last year, as construction loan and business real estate loan net recoveries were higher by $2.5 million and $1.1 million, respectively, while business loan net charge-offs increased $1.0 million. Non-interest income increased $5.3 million, or 2.7%, over the previous year due to growth in bank card fees, corporate cash management fees, swap fees, and cash sweep commissions. These increases were partly offset by declines in operating lease revenue and capital market fees. Non-interest expense increased $17.1 million, or 6.4%, during 2016, mainly due to higher full-time and incentive salary costs and allocated support costs. Also contributing to higher non-interest expense was a recovery of $2.8 million in 2015 related to a letter of credit exposure which had been drawn upon and subsequently paid off. These increases were partly offset by a decline in operating lease asset depreciation. Average segment loans increased $947.2 million, or 13.3%, compared to 2015, with most of the growth in commercial and industrial, construction, business real estate and tax-advantaged loans. Average deposits increased $692.8 million, or 9.2.%, due to growth in business and governmental demand deposit accounts, money market deposit accounts and certificates of deposit greater than $100,000.

Wealth

The Wealth segment provides traditional trust and estate planning, advisory and discretionary investment management services, brokerage services, and includes Private Banking accounts. At December 31, 2017, the Trust group managed investments with a market value of $30.0 billion and administered an additional $18.8 billion in non-managed assets. It also provides investment management services to The Commerce Funds, a series of mutual funds with $2.5 billion in total assets at December 31, 2017. In 2017, pre-tax income for the Wealth segment was $84.9 million, compared to $74.8 million in 2016, an increase of $10.2 million, or 13.6%. Net interest income increased $3.2 million, or 7.1%, due to a $5.1 million increase in loan interest income, partly offset by a $2.1 million decline in net allocated funding credits. Non-interest income increased $13.5 million, or 9.3%, over the prior

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year largely due to higher personal and institutional trust fees, brokerage revenue and cash sweep fees, partly offset by a trust related settlement recorded in 2016. Non-interest expense increased $6.6 million, or 5.8%, resulting from higher incentive compensation and allocated support costs. The provision for loan losses decreased $81 thousand, mainly due to lower charge-offs on revolving home equity loans. Average assets increased $101.6 million, or 9.1%, during 2017 mainly due to higher personal real estate and consumer loans. Average deposits increased $5.6 million, or .3%, due to growth in money market deposit accounts and business demand deposits, partly offset by a decline in long-term certificates of deposit over $100,000.

In 2016, pre-tax income for the Wealth segment was $74.8 million, compared to $70.3 million in 2015, an increase of $4.4 million, or 6.3%. Net interest income increased $1.5 million, or 3.4%, due to a $2.5 million increase in loan interest income and a decline of $412 thousand in deposit interest expense, partly offset by a $1.4 million decline in net allocated funding credits. Non-interest income increased $8.3 million, or 6.1%, over the prior year largely due to higher personal and institutional trust fees, cash sweep fees and a trust related settlement. Non-interest expense increased $5.1 million, or 4.7%, resulting from higher full-time salary costs and incentive compensation. The provision for loan losses increased $197 thousand, mainly due to higher charge-offs on revolving home equity loans. Average assets increased $78.9 million, or 7.6%, during 2016 mainly due to higher personal real estate and consumer loans. Average deposits increased $28.8 million, or 1.4%, due to growth in money market deposit accounts, partly offset by a decline in long-term certificates of deposit over $100,000.

The segment activity, as shown above, includes both direct and allocated items. Amounts in the “Other/Elimination” column include activity not related to the segments, such as certain administrative functions, the investment securities portfolio, and the effect of certain expense allocations to the segments. Also included in this category is the difference between the Company’s provision for loan losses and net loan charge-offs, which are generally assigned directly to the segments. In 2017, the pre-tax income in this category was $30.4 million, compared to $12.7 million in 2016. This increase was due to higher unallocated net interest income of $23.5 million, which was offset by higher unallocated non-interest expense of $30.8 million. Non-interest expense included contributions to a related charitable foundation, which are not allocated to the segments. These contributions totaled $32.0 million in 2017 compared to $1.4 million in 2016. Unallocated securities gains were $25.1 million in 2017, compared to securities losses of $53 thousand in 2016. Also, the unallocated loan loss provision decreased $953 thousand, as the total provision was $4.4 million in excess of charge-offs in 2016 compared to $3.6 million in excess of charge-offs in 2017.

Impact of Recently Issued Accounting Standards

Derivatives In March 2016, the FASB issued ASU 2016-05, "Effect of Derivative Contract Novations on Existing Hedge Accounting Relationships", which clarifies that a change in the counterparty to a derivative instrument that has been designated as the hedging instrument does not, in and of itself, require dedesignation of that hedging relationship provided that all other hedge accounting criteria continue to be met. The amendments were effective January 1, 2017 and did not have a significant effect on the Company's consolidated financial statements.

The FASB issued ASU 2016-06, "Contingent Put and Call Options in Debt Instruments", in March 2016. The ASU clarifies the requirements for assessing whether contingent call (put) options that can accelerate the payment of principal on debt instruments are clearly and closely related to their debt hosts. Under the new guidance, the embedded options should be assessed solely in accordance with a four-step decision sequence, with no additional assessment of whether the triggering event is indexed to interest rates or credit risk. The amendments were effective January 1, 2017 and did not have a significant effect on the Company's consolidated financial statements.

The FASB issued ASU 2017-12, "Targeted Improvements to Accounting for Hedging Activities", in August 2017. The ASU improves the financial reporting of hedging relationships to better portray the economic results of an entity's risk management activities in its financial statements. These improvements allow the hedging of risk components, ease restrictions on the measurement of the change in fair value of the hedged item, aligns the recognition and presentation of the effects of the hedging instrument and the hedged item, and otherwise simplify hedge accounting guidance. The amendments are effective January 1, 2019 but may be adopted early in any interim period. The Company adopted the ASU on January 1, 2018, but as the Company does not currently apply hedge accounting, the Company's consolidated financial statements were not affected by the adoption. The hedging improvements in the new guidance will be considered in the development of risk management strategies in the future.

Investments The FASB issued ASU 2016-07, "Equity Method and Joint Ventures", in March 2016, which eliminates the requirement that an entity retroactively adopt the equity method of accounting if an investment qualifies for use of the equity method as a result of an increase in ownership or influence. Instead, the cost of acquiring the additional interest should be added to the current basis of the previously held interest, and equity method accounting applied prospectively. The amendments were effective January 1, 2017 and did not have a significant effect on the Company's consolidated financial statements.

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Stock Compensation The FASB issued ASU 2016-09, "Improvements to Employee Share-Based Payment Accounting", in March 2016, in order to reduce complexity in this area and improve the usefulness of information provided to users. Amendments which affected public companies included the recognition of excess tax benefits and deficiencies in income tax expense or benefit in the income statement, guidance as to the classification of excess tax benefits on the statement of cash flows, an election to account for award forfeitures as they occur, and the ability to withhold taxes up to the maximum statutory rate in the applicable jurisdictions without triggering liability classification of the award. The amendments were effective January 1, 2017. As further discussed in Note 10 to the consolidated financial statements, the Company elected to account for forfeitures as they occur.

Consolidation The FASB issued ASU 2016-17, "Interests Held through Related Parties That Are under Common Control", in October 2016. The ASU amends current guidance on how a reporting entity that is the single decision maker of a variable interest entity (VIE) should treat indirect interests in the entity held through related parties that are under common control with the reporting entity when determining whether it is the primary beneficiary of that VIE. Current GAAP requires a single decision maker to attribute indirect interests held by certain of its related parties entirely to itself, while the amendments require inclusion of those interests on a proportionate basis consistent with indirect interests held through other related parties. The amendments were effective January 1, 2017 and did not have a significant effect on the Company's consolidated financial statements.

Revenue from Contracts with Customers The FASB issued ASU 2014-09, "Revenue from Contracts with Customers", in May 2014, which has been followed by additional clarifying guidance on specified implementation issues. The ASU supersedes revenue recognition requirements in Topic 605, Revenue Recognition, including most industry specific revenue recognition guidance in the FASB Accounting Standards Codification. The core principle of the new guidance is that an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. The guidance identifies specific steps that entities should apply in order to achieve this principle. Under the ASU and related amendments, the guidance is effective for interim and annual periods beginning January 1, 2018 and must be applied retrospectively, whether through a full restatement of prior periods or a cumulative adjustment upon adoption of the ASU.

Approximately 60% of the Company’s revenue is comprised of net interest income on financial assets and financial liabilities, and is explicitly out of scope of the guidance. The Company has identified the primary contracts in scope as those relating to brokerage commissions, trust fees, deposit account fees, real estate sales, and credit card revenues.  The Company has completed an extensive review of these areas and has concluded that the new guidance does not require any significant change in the revenue recognition process. However, as a result of the review, the Company believes it appropriate to classify certain charges, currently classified as expense, as a reduction of revenue. These are primarily network charges and rewards expense that relate to the Company's bank card products, which approximated $25 million during 2017. In order to provide comparability between periods, the Company plans to adopt the ASU in 2018 on a full retrospective basis, with the only change to prior periods being the reclassification of these charges. Prior period net income will not be affected by the adoption. In future periods, expanded disclosures will be required in order to provide additional understanding of these revenue streams, including disaggregation of total revenue and information about performance obligations, key judgments, estimates and policy decisions regarding revenue recognition.

Liabilities The FASB issued ASU 2016-04, "Recognition of Breakage for Certain Prepaid Stored-Value Products", in March 2016, in order to address current and potential future diversity in practice related to the derecognition of a prepaid stored-value product liability. Such products include prepaid gift cards issued on a specific payment network and redeemable at network-accepting merchant locations, prepaid telecommunication cards, and traveler's checks. The amendments require that the portion of the dollar value of prepaid stored-value products that is ultimately unredeemed (that is, the breakage) be accounted for consistent with the breakage guidance for stored-value product transactions provided in ASC Topic 606 - Revenue from Contracts with Customers. These amendments are effective for interim and annual periods beginning January 1, 2018 and are not expected to have a significant effect on the Company's consolidated financial statements.

Income Taxes The FASB issued ASU 2016-16, "Intra-Entity Transfers of Assets Other Than Inventory", in October 2016. Current GAAP prohibits the recognition of current and deferred income taxes for an intra-entity asset transfer until the asset has been sold to an outside party. The amendments require the recognition of income tax consequences of an intra-entity transfer of an asset (other than inventory) when the transfer occurs. This change removes the current exception to the principal of comprehensive recognition of current and deferred income taxes in GAAP (except for inventory). These amendments are effective for reporting periods beginning January 1, 2018 and are not expected to have a significant effect on the Company's consolidated financial statements.

Financial Instruments The FASB issued ASU 2016-01, "Recognition and Measurement of Financial Assets and Financial Liabilities", in January 2016. Upon adoption, the amendments require all equity investments to be measured at fair value with changes in the fair value recognized through net income, other than those accounted for under the equity method of accounting

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or those that result in the consolidation of the investee. The Company adopted the ASU on January 1, 2018, and as required by the new guidance, recorded a cumulative-effect adjustment on that date which reclassified net unrealized gains/losses on equity securities from accumulated other comprehensive income to retained earnings. This amount of the reclassification totaled approximately $33.3 million, net of tax. As also required by the new guidance, disclosures of the fair value of the Company's loan portfolio will be based on the exit-price concept, beginning in the first quarter of 2018.

Statement of Cash Flows The FASB issued ASU 2016-15, "Classification of Certain Cash Receipts and Cash Payments", in August 2016. The ASU addresses the presentation and classification in the Statement of Cash Flows of several specific cash flow issues. These include cash payments for debt prepayment or extinguishment costs, settlement of zero-coupon debt instruments, distributions received from equity method investees, and separately identifiable cash flows and application of the predominance principle. The amendments are effective January 1, 2018 and are not expected to have a significant effect on the Company's consolidated financial statements.

The FASB issued ASU 2016-18, "Restricted Cash", in November 2016. The ASU addresses the current diversity in the classification and presentation of changes in restricted cash on the statement of cash flows. The ASU requires that amounts described as restricted cash and restricted cash equivalents be included with cash and cash equivalents when reconciling the beginning and end of period amounts shown on the statement of cash flows. Disclosures are to be provided on the nature of restrictions on cash and cash equivalents. When presented in more than one line item within the statement of financial position, the entity shall disclose the amounts, disaggregated by line item, of cash, cash equivalents, restricted cash, and restricted cash equivalents reported within the statement of financial position. The amendments are effective January 1, 2018 and are not expected to have a significant effect on the Company's consolidated financial statements.

Retirement Benefits The FASB issued ASU 2017-07, "Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost", in March 2017. Under current guidance, the different components comprising net benefit cost are aggregated for reporting in the financial statements. Because these components are heterogeneous, the current presentation reduces the transparency and usefulness of the financial statements. The ASU requires that an employer report the service cost component of net benefit cost in the same line item as other compensation costs arising from services rendered during the period. The other components of net benefit cost are required to be presented separately from the servicing cost component. Only service cost is eligible for capitalization when applicable. The amendments are effective January 1, 2018 and are not expected to have a significant effect on the Company's consolidated financial statements.

Leases In February 2016, the FASB issued ASU 2016-02, "Leases", in order to increase transparency and comparability by recognizing lease assets and lease liabilities on the balance sheet and disclosing key information about leasing arrangements. The ASU primarily affects lessee accounting, which requires the lessee to recognize a right-of-use asset and a liability to make lease payments for those leases classified as operating leases under previous GAAP. For leases with a term of 12 months or less, an election by class of underlying asset not to recognize lease assets and lease liabilities is permitted. The ASU also provides additional guidance as to the definition of a lease, identification of lease components, and sale and leaseback transactions. The amendments in the ASU are effective for interim and annual periods beginning January 1, 2019. The Company is the lessee in approximately 200 lease agreements that are subject to this ASU. The Company has formed a working group to assess the changes required and is working with its current software vendor to review a newly created software module designed to comply with the new accounting requirements.

Premium Amortization The FASB issued ASU 2017-08, "Premium Amortization on Purchased Callable Debt Securities", in March 2017. Under current guidance, many entities amortize the premium on purchased callable debt securities over the contractual life of the instrument. As a result, upon the exercise of a call on a callable debt security held at a premium, the unamortized premium is recorded as a loss in earnings. The amendments in this ASU shorten the amortization period for certain callable debt securities held at a premium to the earliest call date, and more closely align the amortization period to expectations incorporated in market pricing of the instrument. The amendments are effective January 1, 2019 and are not expected to have a significant effect on the Company's consolidated financial statements.

Financial Instruments ASU 2016-13, "Measurement of Credit Losses on Financial Instruments", was issued in June 2016. Its implementation will result in a new loan loss accounting framework, also known as the current expected credit loss (CECL) model. CECL requires credit losses expected throughout the life of the asset portfolio on loans and held-to-maturity securities to be recorded at the time of origination. Under the current incurred loss model, losses are recorded when it is probable that a loss event has occurred. The new standard will require significant operational changes, especially in data collection and analysis. The ASU is effective for interim and annual periods beginning January 1, 2020, and is expected to increase the allowance upon adoption. The Company has formed a working group to assess the standard and the data needs required. In the second quarter of 2017, the Company contracted with a software supplier to assist in the data collection and calculation of the allowance for loan losses under

53

the new model, and is currently collecting loan data to be supplied to the vendor to allow for pro-forma CECL calculations to begin by mid-2018.

Intangible Assets The FASB issued ASU 2017-04, "Simplifying the Test for Goodwill Impairment", in January 2017. Under current guidance, a goodwill impairment loss is measured by comparing the implied fair value of a reporting unit's goodwill with the carrying amount of that goodwill by following procedures that would be required in determining the fair value of assets acquired and liabilities assumed in a business combination. Under the new amendments, the goodwill impairment test compares the fair value of a reporting unit with its carrying amount and an impairment charge is measured as the amount by which the carrying amount exceeds the reporting unit's fair value. The amendments are effective for impairment tests beginning January 1, 2020 and are not expected to have a significant effect on the Company's consolidated financial statements.

Comprehensive Income The FASB issued ASU 2018-02, "Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income", in February 2018. The guidance allows a reclassification from accumulated other comprehensive income to retained earnings for stranded tax effects resulting from the Tax Cuts and Jobs Act. The amendments are effective for all entities effective January 1, 2019, but early adoption is permitted in certain circumstances. The Company adopted the ASU effective January 1, 2018 and recorded a reclassification which increased accumulated other comprehensive income and reduced retained earnings by $2.9 million. As these are both categories within equity, total equity was unchanged. The adoption did not have a significant effect on the Company's consolidated financial statements.

Corporate Governance

The Company has adopted a number of corporate governance measures. These include corporate governance guidelines, a code of ethics that applies to its senior financial officers and the charters for its audit committee, its committee on compensation and human resources, and its committee on governance/directors. This information is available on the Company’s Web site www.commercebank.com under Investor Relations.

54

SUMMARY OF QUARTERLY STATEMENTS OF INCOME

Year ended December 31, 2017	For the Quarter Ended
(In thousands, except per share data)	12/31/2017			9/30/2017			6/30/2017			3/31/2017
Interest income	$	201,572		$	194,244		$	193,594		$	187,997
Interest expense	(11,564		)	(11,653		)	(10,787		)	(9,724		)
Net interest income	190,008			182,591			182,807			178,273
Non-interest income	124,212			122,242			123,084			117,066
Investment securities gains (losses), net	27,209			(3,037		)	1,651			(772		)
Salaries and employee benefits	(115,741		)	(111,382		)	(108,829		)	(112,369		)
Other expense	(97,947		)	(73,190		)	(75,765		)	(74,461		)
Provision for loan losses	(12,654		)	(10,704		)	(10,758		)	(11,128		)
Income before income taxes	115,087			106,520			112,190			96,609
Income taxes	(20,104		)	(32,294		)	(33,201		)	(24,907		)
Non-controlling interest	(628		)	338			(29		)	(198		)
Net income attributable to Commerce Bancshares, Inc.	$	94,355		$	74,564		$	78,960		$	71,504
Net income per common share — basic*	$	.86		$	.68		$	.71		$	.65
Net income per common share — diluted*	$	.86		$	.67		$	.71		$	.65
Weighted average shares — basic*	105,619			105,628			105,583			105,389
Weighted average shares — diluted*	105,976			105,981			105,943			105,805

Year ended December 31, 2016	For the Quarter Ended
(In thousands, except per share data)	12/31/2016			9/30/2016			6/30/2016			3/31/2016
Interest income	$	181,498		$	179,361		$	180,065		$	172,128
Interest expense	(8,296		)	(8,118		)	(8,236		)	(8,353		)
Net interest income	173,202			171,243			171,829			163,775
Non-interest income	119,479			119,319			116,570			119,024
Investment securities gains (losses), net	3,651			(1,965		)	(744		)	(995		)
Salaries and employee benefits	(108,639		)	(107,004		)	(104,808		)	(106,859		)
Other expense	(72,622		)	(74,238		)	(72,281		)	(70,614		)
Provision for loan losses	(10,400		)	(7,263		)	(9,216		)	(9,439		)
Income before income taxes	104,671			100,092			101,350			94,892
Income taxes	(32,297		)	(30,942		)	(31,542		)	(29,370		)
Non-controlling interest	(795		)	(605		)	85			(148		)
Net income attributable to Commerce Bancshares, Inc.	$	71,579		$	68,545		$	69,893		$	65,374
Net income per common share — basic*	$	.65		$	.63		$	.63		$	.59
Net income per common share — diluted*	$	.65		$	.62		$	.63		$	.59
Weighted average shares — basic*	105,245			105,207			105,158			105,361
Weighted average shares — diluted*	105,586			105,476			105,433			105,600

Year ended December 31, 2015	For the Quarter Ended
(In thousands, except per share data)	12/31/2015			9/30/2015			6/30/2015			3/31/2015
Interest income	$	169,742		$	169,115		$	170,577		$	152,982
Interest expense	(7,255		)	(7,077		)	(6,920		)	(6,844		)
Net interest income	162,487			162,038			163,657			146,138
Non-interest income	116,042			111,288			114,235			106,574
Investment securities gains (losses), net	(1,480		)	(378		)	2,143			6,035
Salaries and employee benefits	(102,098		)	(100,874		)	(99,655		)	(98,074		)
Other expense	(73,679		)	(70,528		)	(65,808		)	(65,771		)
Provision for loan losses	(9,186		)	(8,364		)	(6,757		)	(4,420		)
Income before income taxes	92,086			93,182			107,815			90,482
Income taxes	(27,661		)	(27,969		)	(32,492		)	(28,468		)
Non-controlling interest	(715		)	(601		)	(970		)	(959		)
Net income attributable to Commerce Bancshares, Inc.	$	63,710		$	64,612		$	74,353		$	61,055
Net income per common share — basic*	$	.58		$	.58		$	.65		$	.52
Net income per common share — diluted*	$	.57		$	.58		$	.65		$	.52
Weighted average shares — basic*	106,074			106,489			109,257			110,309
Weighted average shares — diluted*	106,376			106,813			109,630			110,655

* Restated for the 5% stock dividend distributed in 2017.

55

AVERAGE BALANCE SHEETS — AVERAGE RATES AND YIELDS

	Years Ended December 31
	2017							2016							2015
(Dollars in thousands)	Average Balance			Interest Income/Expense		Average Rates Earned/Paid		Average Balance			Interest Income/Expense		Average Rates Earned/Paid		Average Balance			Interest Income/Expense		Average Rates Earned/Paid
ASSETS
Loans:(A)
Business(B)	$	4,832,045		$	154,681	3.20	%	$	4,652,526		$	134,438	2.89	%	$	4,186,101		$	116,455	2.78	%
Real estate – construction and land	881,879			37,315		4.23		778,822			27,452		3.52		477,320			17,075		3.58
Real estate – business	2,694,620			102,009		3.79		2,440,955			89,305		3.66		2,293,839			85,751		3.74
Real estate – personal	2,019,674			75,267		3.73		1,936,420			72,417		3.74		1,899,234			71,666		3.77
Consumer	2,036,393			81,065		3.98		1,947,240			75,076		3.86		1,829,830			72,625		3.97
Revolving home equity	398,611			15,516		3.89		417,514			14,797		3.54		431,033			15,262		3.54
Consumer credit card	743,885			88,329		11.87		749,589			86,008		11.47		746,503			86,162		11.54
Overdrafts	4,592			—		—		4,712			—		—		5,416			—		—
Total loans	13,611,699			554,182		4.07		12,927,778			499,493		3.86		11,869,276			464,996		3.92
Loans held for sale	17,452			1,000		5.73		25,710			1,317		5.12		4,115			191		4.64
Investment securities:
U.S. government & federal agency obligations	914,961			19,697		2.15		735,081			15,628		2.13		466,135			5,180		1.11
Government-sponsored enterprise obligations	452,422			7,321		1.62		591,785			13,173		2.23		938,589			17,319		1.85
State & municipal obligations(B)	1,720,723			62,073		3.61		1,753,727			63,261		3.61		1,786,235			63,054		3.53
Mortgage-backed securities	3,784,602			89,623		2.37		3,460,821			82,888		2.40		3,164,447			80,936		2.56
Asset-backed securities	2,083,611			36,757		1.76		2,418,118			35,346		1.46		2,773,069			29,558		1.07
Other marketable securities(B)	335,791			9,384		2.79		336,968			9,481		2.81		262,937			7,038		2.68
Trading securities(B)	21,929			583		2.66		19,722			489		2.48		20,517			562		2.74
Non-marketable securities(B)	100,805			11,816		11.72		115,778			8,765		7.57		111,380			9,540		8.57
Total investment securities	9,414,844			237,254		2.52		9,432,000			229,031		2.43		9,523,309			213,187		2.24
Federal funds sold and short-term securities purchased under agreements to resell	18,518			230		1.24		12,660			78		.62		16,184			60		.37
Long-term securities purchased under agreements to resell	688,147			15,440		2.24		791,392			13,544		1.71		1,002,053			13,172		1.31
Interest earning deposits with banks	207,269			2,223		1.07		188,581			973		.52		206,115			528		.26
Total interest earning assets	23,957,929			810,329		3.38		23,378,121			744,436		3.18		22,621,052			692,134		3.06
Allowance for loan losses	(156,572		)					(152,628		)					(152,690		)
Unrealized gain on investment securities	98,865							183,036							146,854
Cash and due from banks	361,414							381,822							378,803
Land, buildings and equipment - net	345,639							350,443							359,773
Other assets	424,333							415,677							383,810
Total assets	$	25,031,608						$	24,556,471						$	23,737,602
LIABILITIES AND EQUITY
Interest bearing deposits:
Savings	$	819,558		981		.12		$	775,121		923		.12		$	729,311		876		.12
Interest checking and money market	10,517,741			16,328		.16		10,285,288			13,443		.13		9,752,794			12,498		.13
Time open & C.D.’s of less than $100,000	676,272			2,645		.39		749,261			2,809		.37		832,343			3,236		.39
Time open & C.D.’s of $100,000 and over	1,404,960			10,859		.77		1,471,610			8,545		.58		1,224,402			6,051		.49
Total interest bearing deposits	13,418,531			30,813		.23		13,281,280			25,720		.19		12,538,850			22,661		.18
Borrowings:
Federal funds purchased and securities sold under agreements to repurchase	1,462,387			9,829		.67		1,266,093			3,315		.26		1,654,860			1,861		.11
Other borrowings	87,696			3,086		3.52		171,255			3,968		2.32		103,884			3,574		3.44
Total borrowings	1,550,083			12,915		.83		1,437,348			7,283		.51		1,758,744			5,435		.31
Total interest bearing liabilities	14,968,614			43,728		.29	%	14,718,628			33,003		.22	%	14,297,594			28,096		.20	%
Non-interest bearing deposits	7,176,255							7,049,633							6,786,741
Other liabilities	250,510							292,145							280,231
Equity	2,636,229							2,496,065							2,373,036
Total liabilities and equity	$	25,031,608						$	24,556,471						$	23,737,602
Net interest margin (T/E)				$	766,601						$	711,433						$	664,038
Net yield on interest earning assets						3.20	%						3.04	%						2.94	%
Percentage increase (decrease) in net interest margin (T/E) compared to the prior year						7.75	%						7.14	%						2.38	%

(A) Loans on non-accrual status are included in the computation of average balances. Included in interest income above are loan fees and late charges, net of amortization of deferred loan origination fees and costs, which are immaterial. Credit card income from merchant discounts and net interchange fees are not included in loan income.

AVERAGE BALANCE SHEETS — AVERAGE RATES AND YIELDS

56

Years Ended December 31
2014							2013							2012
Average Balance			Interest Income/Expense		Average Rates Earned/Paid		Average Balance			Interest Income/Expense		Average Rates Earned/Paid		Average Balance			Interest Income/Expense		Average Rates Earned/Paid		Average Balance Five Year Compound Growth Rate
$	3,919,421		$	110,791	2.83	%	$	3,366,564		$	102,847	3.05	%	$	2,962,699		$	102,013	3.44	%	10.28	%
418,702			15,826		3.78		378,896			15,036		3.97		356,425			15,146		4.25		19.86
2,300,855			88,206		3.83		2,251,113			92,555		4.11		2,193,271			98,693		4.50		4.20
1,818,125			69,054		3.80		1,694,955			66,353		3.91		1,503,357			65,642		4.37		6.08
1,617,039			68,434		4.23		1,437,270			67,299		4.68		1,180,538			66,402		5.62		11.52
426,720			16,188		3.79		424,358			16,822		3.96		446,204			18,586		4.17		(2.23	)
754,482			86,298		11.44		752,478			84,843		11.28		730,697			85,652		11.72		.36
4,889			—		—		6,020			—		—		6,125			—		—		(5.60	)
11,260,233			454,797		4.04		10,311,654			445,755		4.32		9,379,316			452,134		4.82		7.73
—			—		—		4,488			176		3.92		9,688			361		3.73		12.49
497,271			13,750		2.77		401,162			8,775		2.19		332,382			12,260		3.69		22.45
794,752			13,211		1.66		499,947			8,658		1.73		306,676			5,653		1.84		8.09
1,715,493			61,593		3.59		1,617,814			58,522		3.62		1,376,872			54,056		3.93		4.56
2,981,225			80,229		2.69		3,187,648			87,523		2.75		3,852,616			107,527		2.79		(.36	)
2,834,013			24,976		.88		3,061,415			27,475		.90		2,925,249			31,940		1.09		(6.56	)
150,379			3,928		2.61		182,323			5,625		3.09		139,499			6,556		4.70		19.21
18,423			411		2.23		20,986			472		2.25		25,107			637		2.54		(2.67	)
104,211			10,692		10.26		116,557			12,226		10.49		118,879			12,558		10.56		(3.24	)
9,095,767			208,790		2.30		9,087,852			209,276		2.30		9,077,280			231,187		2.55		.73
31,817			101		.32		24,669			106		.43		16,393			82		.50		2.47
985,205			12,473		1.27		1,174,589			21,119		1.80		892,624			19,174		2.15		(5.07	)
220,876			555		.25		155,885			387		.25		135,319			339		.25		8.90
21,593,898			676,716		3.13		20,759,137			676,819		3.26		19,510,620			703,277		3.60		4.19
(160,828		)					(166,846		)					(178,934		)					(2.63	)
126,314							157,910							257,511							(17.42	)
382,207							382,500							369,020							(.42	)
354,899							357,544							357,336							(.66	)
376,433							383,739							385,125							1.96
$	22,672,923						$	21,873,984						$	20,700,678						3.87
$	670,650		855		.13		$	625,517		766		.12		$	574,336		802		.14		7.37
9,477,947			12,667		.13		9,059,524			13,589		.15		8,430,559			17,880		.21		4.52
935,387			4,137		.44		1,034,991			6,002		.58		1,117,236			7,918		.71		(9.55	)
1,372,509			5,926		.43		1,380,003			6,383		.46		1,181,426			7,174		.61		3.53
12,456,493			23,585		.19		12,100,035			26,740		.22		11,303,557			33,774		.30		3.49
1,257,660			1,019		.08		1,294,691			809		.06		1,185,978			808		.07		4.28
104,896			3,484		3.32		103,901			3,364		3.24		108,916			3,481		3.20		(4.24	)
1,362,556			4,503		.33		1,398,592			4,173		.30		1,294,894			4,289		.33		3.66
13,819,049			28,088		.20	%	13,498,627			30,913		.23	%	12,598,451			38,063		.30	%	3.51
6,339,183							5,961,116							5,522,991							5.38
225,554							237,130							334,684							(5.63	)
2,289,137							2,177,111							2,244,552							3.27
$	22,672,923						$	21,873,984						$	20,700,678						3.87	%
			$	648,628						$	645,906						$	665,214
					3.00	%						3.11	%						3.41	%
					.42	%						(2.90	)%						(.64	)%

(B) Interest income and yields are presented on a fully-taxable equivalent basis using the Federal statutory income tax rate. Loan interest income includes tax free loan income (categorized as business loan income) which includes tax equivalent adjustments of $10,357,000 in 2017, $9,537,000 in 2016, $8,332,000 in 2015, $7,640,000 in 2014, $6,673,000 in 2013, and    $5,803,000 in 2012. Investment securities interest income includes tax equivalent adjustments of $22,565,000 in 2017, $21,847,000 in 2016, $21,386,000 in 2015, $20,784,000 in 2014, $19,861,000 in 2013, and $19,505,000 in 2012 . These adjustments relate to state and municipal obligations, other marketable securities, trading securities, and non-marketable securities.

57

QUARTERLY AVERAGE BALANCE SHEETS — AVERAGE RATES AND YIELDS

	Year ended December 31, 2017
	Fourth Quarter					Third Quarter					Second Quarter					First Quarter
(Dollars in millions)	Average Balance			Average Rates Earned/Paid		Average Balance			Average Rates Earned/Paid		Average Balance			Average Rates Earned/Paid		Average Balance			Average Rates Earned/Paid
ASSETS
Loans:
Business(A)	$	4,818		3.32	%	$	4,778		3.25	%	$	4,828		3.21	%	$	4,907		3.02	%
Real estate – construction and land	948			4.41		888			4.31		862			4.30		828			3.85
Real estate – business	2,720			3.90		2,710			3.85		2,701			3.74		2,646			3.63
Real estate – personal	2,045			3.72		2,017			3.72		2,004			3.72		2,012			3.74
Consumer	2,101			4.07		2,070			4.02		1,998			3.94		1,975			3.89
Revolving home equity	394			4.06		395			4.03		400			3.84		405			3.64
Consumer credit card	757			11.90		740			12.03		731			11.90		748			11.66
Overdrafts	5			—		4			—		5			—		4			—
Total loans	13,788			4.18		13,602			4.13		13,529			4.06		13,525			3.92
Loans held for sale	18			5.55		21			5.36		18			5.75		12			6.64
Investment securities:
U.S. government & federal agency obligations	918			2.60		918			1.40		912			2.52		913			2.09
Government-sponsored enterprise obligations	452			1.69		457			1.61		450			1.59		450			1.58
State & municipal obligations(A)	1,631			3.60		1,699			3.57		1,772			3.61		1,783			3.65
Mortgage-backed securities	3,950			2.38		3,719			2.36		3,708			2.35		3,760			2.38
Asset-backed securities	1,623			1.94		2,025			1.82		2,335			1.72		2,360			1.63
Other marketable securities(A)	356			2.86		328			2.73		326			2.76		333			2.82
Trading securities(A)	20			2.63		21			2.51		21			2.70		25			2.77
Non-marketable securities(A)	98			8.08		103			6.46		102			11.49		101			21.08
Total investment securities	9,048			2.59		9,270			2.39		9,626			2.52		9,725			2.58
Federal funds sold and short-term securities purchased under agreements to resell	27			1.35		24			1.30		13			1.13		10			.94
Long-term securities purchased under agreements to resell	700			2.36		662			2.28		666			2.22		725			2.12
Interest earning deposits with banks	270			1.18		211			1.24		139			1.04		208			.77
Total interest earning assets	23,851			3.48		23,790			3.37		23,991			3.37		24,205			3.30
Allowance for loan losses	(157		)			(157		)			(157		)			(155		)
Unrealized gain on investment securities	112					117					103					63
Cash and due from banks	372					349					349					376
Land, buildings and equipment – net	347					345					344					346
Other assets	438					429					413					417
Total assets	$	24,963				$	24,873				$	25,043				$	25,252
LIABILITIES AND EQUITY
Interest bearing deposits:
Savings	$	822		.12		$	829		.12		$	831		.12		$	796		.13
Interest checking and money market	10,416			.17		10,387			.16		10,667			.15		10,604			.14
Time open & C.D.’s under $100,000	645			.40		668			.40		688			.39		705			.37
Time open & C.D.’s $100,000 & over	1,119			.88		1,326			.83		1,510			.75		1,671			.67
Total interest bearing deposits	13,002			.24		13,210			.24		13,696			.23		13,776			.21
Borrowings:
Federal funds purchased and securities sold under agreements to repurchase	1,626			.83		1,501			.75		1,363			.60		1,356			.46
Other borrowings	42			3.59		102			3.53		106			3.47		102			3.53
Total borrowings	1,668			.90		1,603			.93		1,469			.81		1,458			.67
Total interest bearing liabilities	14,670			.31	%	14,813			.31	%	15,165			.29	%	15,234			.26	%
Non-interest bearing deposits	7,257					7,136					7,066					7,247
Other liabilities	312					252					203					234
Equity	2,724					2,672					2,609					2,537
Total liabilities and equity	$	24,963				$	24,873				$	25,043				$	25,252
Net interest margin (T/E)	$	198				$	190				$	191				$	187
Net yield on interest earning assets				3.29	%				3.18	%				3.19	%				3.14	%

(A) Includes tax equivalent calculations.

58

QUARTERLY AVERAGE BALANCE SHEETS — AVERAGE RATES AND YIELDS

	Year ended December 31, 2016
	Fourth Quarter					Third Quarter					Second Quarter					First Quarter
(Dollars in millions)	Average Balance			Average Rates Earned/Paid		Average Balance			Average Rates Earned/Paid		Average Balance			Average Rates Earned/Paid		Average Balance			Average Rates Earned/Paid
ASSETS
Loans:
Business(A)	$	4,731		2.91	%	$	4,695		2.87	%	$	4,692		2.90	%	$	4,492		2.87	%
Real estate – construction and land	821			3.64		821			3.48		789			3.46		683			3.51
Real estate – business	2,559			3.61		2,432			3.63		2,389			3.69		2,382			3.70
Real estate – personal	1,986			3.69		1,944			3.73		1,906			3.76		1,909			3.77
Consumer	1,978			3.85		1,948			3.91		1,928			3.80		1,935			3.87
Revolving home equity	415			3.50		412			3.56		413			3.59		429			3.52
Consumer credit card	758			11.38		750			11.56		738			11.54		752			11.42
Overdrafts	6			—		5			—		4			—		5			—
Total loans	13,254			3.85		13,007			3.86		12,859			3.86		12,587			3.89
Loans held for sale	11			5.77		27			5.00		56			4.95		9			5.80
Investment securities:
U.S. government & federal agency obligations	812			2.18		726			2.43		698			3.48		703			.40
Government-sponsored enterprise obligations	446			1.54		482			2.24		666			3.03		777			1.93
State & municipal obligations(A)	1,784			3.57		1,748			3.60		1,764			3.60		1,719			3.66
Mortgage-backed securities	3,657			2.40		3,366			2.38		3,394			2.36		3,425			2.45
Asset-backed securities	2,417			1.52		2,341			1.48		2,378			1.45		2,537			1.39
Other marketable securities(A)	333			2.95		335			2.74		338			2.77		342			2.79
Trading securities(A)	22			2.40		18			2.42		21			2.27		18			2.87
Non-marketable securities(A)	105			5.42		114			10.24		116			8.03		128			6.54
Total investment securities	9,576			2.39		9,130			2.49		9,375			2.58		9,649			2.26
Federal funds sold and short-term securities purchased under agreements to resell	8			.72		13			.61		12			.64		17			.56
Long-term securities purchased under agreements to resell	725			1.86		766			1.73		825			1.64		850			1.64
Interest earning deposits with banks	201			.56		208			.51		125			.49		220			.49
Total interest earning assets	23,775			3.17		23,151			3.22		23,252			3.25		23,332			3.10
Allowance for loan losses	(154		)			(154		)			(152		)			(151		)
Unrealized gain on investment securities	156					235					192					149
Cash and due from banks	372					362					372					421
Land, buildings and equipment – net	346					348					351					357
Other assets	436					442					390					395
Total assets	$	24,931				$	24,384				$	24,405				$	24,503
LIABILITIES AND EQUITY
Interest bearing deposits:
Savings	$	773		.12		$	779		.12		$	787		.11		$	761		.12
Interest checking and money market	10,512			.13		10,211			.13		10,288			.13		10,129			.13
Time open & C.D.’s under $100,000	723			.37		741			.37		759			.38		775			.38
Time open & C.D.’s $100,000 & over	1,334			.60		1,434			.61		1,636			.58		1,484			.54
Total interest bearing deposits	13,342			.19		13,165			.20		13,470			.20		13,149			.19
Borrowings:
Federal funds purchased and securities sold under agreements to repurchase	1,285			.30		1,164			.25		1,212			.24		1,404			.25
Other borrowings	101			3.54		103			3.51		105			3.49		378			1.33
Total borrowings	1,386			.54		1,267			.51		1,317			.50		1,782			.48
Total interest bearing liabilities	14,728			.22	%	14,432			.22	%	14,787			.22	%	14,931			.23	%
Non-interest bearing deposits	7,308					7,096					6,886					6,906
Other liabilities	347					306					260					254
Equity	2,548					2,550					2,472					2,412
Total liabilities and equity	$	24,931				$	24,384				$	24,405				$	24,503
Net interest margin (T/E)	$	181				$	179				$	180				$	171
Net yield on interest earning assets				3.03	%				3.08	%				3.11	%				2.95	%

(A) Includes tax equivalent calculations.

59

Item 7a. QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

The information required by this item is set forth on pages 46 through 47 of Management’s Discussion and Analysis of Financial Condition and Results of Operations.

Item 8. FINANCIAL STATEMENTS AND SUPPLEMENTARY DATA

REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

To the Stockholders and Board of Directors

Commerce Bancshares, Inc.:

Opinion on the Consolidated Financial Statements

We have audited the accompanying consolidated balance sheets of Commerce Bancshares, Inc. and subsidiaries (the “Company”) as of December 31, 2017 and 2016, the related consolidated statements of income, comprehensive income, cash flows, and changes in equity for each of the years in the three-year period ended December 31, 2017, and the related notes (collectively, the “consolidated financial statements”). In our opinion, the consolidated financial statements present fairly, in all material respects, the financial position of the Company as of December 31, 2017 and 2016, and the results of its operations and its cash flows for each of the years in the three-year period ended December 31, 2017, in conformity with U.S. generally accepted accounting principles.

We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States) (“PCAOB”), the Company’s internal control over financial reporting as of December 31, 2017, based on criteria established in Internal Control - Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission, and our report dated February 22, 2018 expressed an unqualified opinion on the effectiveness of the Company’s internal control over financial reporting.

Basis for Opinion

These consolidated financial statements are the responsibility of the Company’s management. Our responsibility is to express an opinion on these consolidated financial statements based on our audits. We are a public accounting firm registered with the PCAOB and are required to be independent with respect to the Company in accordance with the U.S. federal securities laws and the applicable rules and regulations of the Securities and Exchange Commission and the PCAOB.

We conducted our audits in accordance with the standards of the PCAOB. Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the consolidated financial statements are free of material misstatement, whether due to error or fraud. Our audits included performing procedures to assess the risks of material misstatement of the consolidated financial statements, whether due to error or fraud, and performing procedures that respond to those risks. Such procedures included examining, on a test basis, evidence regarding the amounts and disclosures in the consolidated financial statements. Our audits also included evaluating the accounting principles used and significant estimates made by management, as well as evaluating the overall presentation of the consolidated financial statements. We believe that our audits provide a reasonable basis for our opinion.

We have served as the Company’s auditor since 1971.

Kansas City, Missouri

February 22, 2018

60

Commerce Bancshares, Inc. and Subsidiaries

CONSOLIDATED BALANCE SHEETS

	December 31
	2017			2016
	(In thousands)
ASSETS
Loans	$	13,983,674		$	13,412,736
Allowance for loan losses	(159,532		)	(155,932		)
Net loans	13,824,142			13,256,804
Loans held for sale (including $15,327,000 and $9,263,000 of residential mortgage loans carried at fair value at December 31, 2017 and 2016, respectively)	21,398			14,456
Investment securities:
Available for sale ($662,515,000 and $568,553,000 pledged at December 31, 2017 and    2016, respectively, to secure swap and repurchase agreements)	8,774,280			9,649,203
Trading	18,269			22,225
Non-marketable	100,758			99,558
Total investment securities	8,893,307			9,770,986
Federal funds sold and short-term securities purchased under agreements to resell	42,775			15,470
Long-term securities purchased under agreements to resell	700,000			725,000
Interest earning deposits with banks	30,631			272,275
Cash and due from banks	438,439			494,690
Land, buildings and equipment – net	335,110			337,705
Goodwill	138,921			138,921
Other intangible assets – net	7,618			6,709
Other assets	401,074			608,408
Total assets	$	24,833,415		$	25,641,424
LIABILITIES AND STOCKHOLDERS’ EQUITY
Deposits:
Non-interest bearing	$	7,158,962		$	7,429,398
Savings, interest checking and money market	11,499,620			11,430,789
Time open and C.D.’s of less than $100,000	634,646			713,075
Time open and C.D.’s of $100,000 and over	1,132,218			1,527,833
Total deposits	20,425,446			21,101,095
Federal funds purchased and securities sold under agreements to repurchase	1,507,138			1,723,905
Other borrowings	1,758			102,049
Other liabilities	180,889			213,243
Total liabilities	22,115,231			23,140,292
Commerce Bancshares, Inc. stockholders’ equity:
Preferred stock, $1 par value    Authorized 2,000,000 shares; issued 6,000 shares	144,784			144,784
Common stock, $5 par value    Authorized 120,000,000 shares; issued 107,081,397 shares at December 31, 2017 and 102,003,046 shares at December 31, 2016	535,407			510,015
Capital surplus	1,815,360			1,552,454
Retained earnings	221,374			292,849
Treasury stock of 276,968 shares at December 31, 2017 and 364,711 shares at December 31, 2016, at cost	(14,473		)	(15,294		)
Accumulated other comprehensive income	14,108			10,975
Total Commerce Bancshares, Inc. stockholders’ equity	2,716,560			2,495,783
Non-controlling interest	1,624			5,349
Total equity	2,718,184			2,501,132
Total liabilities and equity	$	24,833,415		$	25,641,424

See accompanying notes to consolidated financial statements.

61

Commerce Bancshares, Inc. and Subsidiaries

CONSOLIDATED STATEMENTS OF INCOME

	For the Years Ended December 31
(In thousands, except per share data)	2017		2016			2015
INTEREST INCOME
Interest and fees on loans	$	543,825	$	489,956		$	456,664
Interest on loans held for sale	1,000		1,317			191
Interest on investment securities	214,689		207,184			191,801
Interest on federal funds sold and short-term securities purchased under agreements to resell	230		78			60
Interest on long-term securities purchased under agreements to resell	15,440		13,544			13,172
Interest on deposits with banks	2,223		973			528
Total interest income	777,407		713,052			662,416
INTEREST EXPENSE
Interest on deposits:
Savings, interest checking and money market	17,309		14,366			13,374
Time open and C.D.’s of less than $100,000	2,645		2,809			3,236
Time open and C.D.’s of $100,000 and over	10,859		8,545			6,051
Interest on federal funds purchased and securities sold under agreements to repurchase	9,829		3,315			1,861
Interest on other borrowings	3,086		3,968			3,574
Total interest expense	43,728		33,003			28,096
Net interest income	733,679		680,049			634,320
Provision for loan losses	45,244		36,318			28,727
Net interest income after provision for loan losses	688,435		643,731			605,593
NON-INTEREST INCOME
Bank card transaction fees	180,441		181,879			178,926
Trust fees	135,159		121,795			118,437
Deposit account charges and other fees	90,060		86,394			80,416
Capital market fees	7,996		10,655			11,476
Consumer brokerage services	14,630		13,784			13,784
Loan fees and sales	13,948		11,412			8,228
Other	44,370		48,473			36,872
Total non-interest income	486,604		474,392			448,139
INVESTMENT SECURITIES GAINS (LOSSES), NET	25,051		(53		)	6,320
NON-INTEREST EXPENSE
Salaries and employee benefits	448,321		427,310			400,701
Net occupancy	45,612		46,290			44,788
Equipment	18,568		19,141			19,086
Supplies and communication	22,790		24,135			22,970
Data processing and software	92,246		92,722			83,944
Marketing	16,325		16,032			16,107
Deposit insurance	13,986		13,327			12,146
Community service	34,377		3,906			3,180
Other	77,459		74,202			73,565
Total non-interest expense	769,684		717,065			676,487
Income before income taxes	430,406		401,005			383,565
Less income taxes	110,506		124,151			116,590
Net income	319,900		276,854			266,975
Less non-controlling interest expense	517		1,463			3,245
Net income attributable to Commerce Bancshares, Inc.	319,383		275,391			263,730
Less preferred stock dividends	9,000		9,000			9,000
Net income available to common shareholders	$	310,383	$	266,391		$	254,730
Net income per common share - basic	$	2.90	$	2.50		$	2.33
Net income per common share - diluted	$	2.89	$	2.49		$	2.32

See accompanying notes to consolidated financial statements.

62

Commerce Bancshares, Inc. and Subsidiaries

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME

	For the Years Ended December 31
(In thousands)	2017			2016			2015
Net income	$	319,900		$	276,854		$	266,975
Other comprehensive income (loss):
Net unrealized gains (losses) on securities for which a portion of an other-than-temporary impairment has been recorded in earnings	412			(341		)	(518		)
Net unrealized gains (losses) on other securities	3,022			(22,422		)	(31,517		)
Change in pension loss	(301		)	1,268			2,412
Other comprehensive income (loss)	3,133			(21,495		)	(29,623		)
Comprehensive income	323,033			255,359			237,352
Less non-controlling interest expense	517			1,463			3,245
Comprehensive income attributable to Commerce Bancshares, Inc.	$	322,516		$	253,896		$	234,107

See accompanying notes to consolidated financial statements.

63

Commerce Bancshares, Inc. and Subsidiaries

CONSOLIDATED STATEMENTS OF CASH FLOWS

	For the Years Ended December 31
(In thousands)	2017			2016			2015
OPERATING ACTIVITIES
Net income	$	319,900		$	276,854		$	266,975
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for loan losses	45,244			36,318			28,727
Provision for depreciation and amortization	39,732			40,929			42,803
Amortization of investment security premiums, net	35,423			31,493			32,618
Deferred income tax (benefit) expense	13,617			(2,059		)	7,432
Investment securities (gains) losses, net	(25,051		)	53			(6,320		)
Net gains on sales of loans held for sale	(8,008		)	(5,850		)	(3,076		)
Proceeds from sales of loans held for sale	215,373			160,875			97,813
Originations of loans held for sale	(216,064		)	(163,469		)	(103,199		)
Net (increase) decrease in trading securities, excluding unsettled transactions	7,585			73,780			(86,045		)
Stock-based compensation	12,105			11,525			10,147
Increase in interest receivable	(4,459		)	(3,642		)	(4,992		)
Increase in interest payable	38			1,107			336
Increase (decrease) in income taxes payable	(27,685		)	4,509			11,733
Donation of securities	32,036			—			—
Other changes, net	(6,560		)	(26,666		)	(3,757		)
Net cash provided by operating activities	433,226			435,757			291,195
INVESTING ACTIVITIES
Proceeds from sales of investment securities	792,380			24,380			689,031
Proceeds from maturities/pay downs of investment securities	1,899,640			2,032,397			2,515,113
Purchases of investment securities	(1,853,817		)	(1,988,101		)	(3,542,537		)
Net increase in loans	(614,849		)	(1,009,523		)	(1,005,657		)
Long-term securities purchased under agreements to resell	(75,000		)	(250,000		)	—
Repayments of long-term securities purchased under agreements to resell	100,000			400,000			175,000
Purchases of land, buildings and equipment	(30,824		)	(24,478		)	(31,897		)
Sales of land, buildings and equipment	3,190			10,112			5,545
Net cash provided by (used in) investing activities	220,720			(805,213		)	(1,195,402		)
FINANCING ACTIVITIES
Net increase (decrease) in non-interest bearing, savings, interest checking and money market deposits	(15,036		)	782,846			545,147
Net increase (decrease) in time open and C.D.’s	(474,044		)	243,199			(124,509		)
Net increase (decrease) in federal funds purchased and short-term securities sold under agreements to repurchase	(216,767		)	(239,647		)	101,034
Net decrease in other borrowings	(100,291		)	(1,769		)	(240		)
Purchases of treasury stock	(17,771		)	(39,381		)	(23,176		)
Accelerated share repurchase agreements	—			—			(100,000		)
Issuance of stock under equity compensation plans	(8		)	(6		)	1,914
Cash dividends paid on common stock	(91,619		)	(87,070		)	(84,961		)
Cash dividends paid on preferred stock	(9,000		)	(9,000		)	(9,000		)
Net cash provided by (used in) financing activities	(924,536		)	649,172			306,209
Increase (decrease) in cash and cash equivalents	(270,590		)	279,716			(597,998		)
Cash and cash equivalents at beginning of year	782,435			502,719			1,100,717
Cash and cash equivalents at end of year	$	511,845		$	782,435		$	502,719
Income tax payments, net	$	120,744		$	119,596		$	95,341
Interest paid on deposits and borrowings	43,690			31,896			27,760
Loans transferred to foreclosed real estate	2,063			1,122			3,778
Settlement of accelerated share repurchase agreement and receipt of treasury stock	—			—			60,000
Loans transferred from held for investment to held for sale, net	—			42,688			—

See accompanying notes to consolidated financial statements.

64

Commerce Bancshares, Inc. and Subsidiaries

CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY

			Commerce Bancshares, Inc. Shareholders
(In thousands, except per share data)	Preferred Stock		Common Stock		Capital Surplus			Retained Earnings			Treasury Stock			Accumulated Other Comprehensive Income (Loss)			Non-Controlling Interest			Total
Balance, December 31, 2014	$	144,784	$	484,155	$	1,229,075		$	426,648		$	(16,562	)	$	62,093		$	4,053		$	2,334,246
Net income								263,730									3,245			266,975
Other comprehensive loss														(29,623		)				(29,623		)
Distributions to non-controlling interest																	(1,870		)	(1,870		)
Purchases of treasury stock											(23,176		)							(23,176		)
Accelerated share repurchase agreements					60,000						(160,000		)							(100,000		)
Cash dividends paid on common stock ($.777 per share)								(84,961		)										(84,961		)
Cash dividends paid on preferred stock ($1.500 per depositary share)								(9,000		)										(9,000		)
Excess tax benefit related to equity compensation plans					2,132															2,132
Stock-based compensation					10,147															10,147
Issuance under stock purchase and equity compensation plans					(16,615		)				19,503									2,888
5% stock dividend, net			5,707		52,938			(213,104		)	154,119									(340		)
Balance, December 31, 2015	144,784		489,862		1,337,677			383,313			(26,116		)	32,470			5,428			2,367,418
Net income								275,391									1,463			276,854
Other comprehensive loss														(21,495		)				(21,495		)
Distributions to non-controlling interest																	(1,542		)	(1,542		)
Purchases of treasury stock											(39,381		)							(39,381		)
Cash dividends paid on common stock ($.816 per share)								(87,070		)										(87,070		)
Cash dividends paid on preferred stock ($1.500 per depositary share)								(9,000		)										(9,000		)
Excess tax benefit related to equity compensation plans					3,390															3,390
Stock-based compensation					11,525															11,525
Issuance under stock purchase and equity compensation plans					(15,810		)				16,721									911
5% stock dividend, net			20,153		215,672			(269,785		)	33,482									(478		)
Balance, December 31, 2016	144,784		510,015		1,552,454			292,849			(15,294		)	10,975			5,349			2,501,132
Adoption of ASU 2016-09					3,441			(2,144		)										1,297
Net income								319,383									517			319,900
Other comprehensive income														3,133						3,133
Distributions to non-controlling interest																	(1,293		)	(1,293		)
Sale of non-controlling interest of subsidiary					2,950												(2,949		)	1
Purchases of treasury stock											(17,771		)							(17,771		)
Cash dividends paid on common stock ($.857 per share)								(91,619		)										(91,619		)
Cash dividends paid on preferred stock ($1.500 per depositary share)								(9,000		)										(9,000		)
Stock-based compensation					12,105															12,105
Issuance under stock purchase and equity compensation plans					(17,734		)				18,592									858
5% stock dividend, net			25,392		262,144			(288,095		)										(559		)
Balance, December 31, 2017	$	144,784	$	535,407	$	1,815,360		$	221,374		$	(14,473	)	$	14,108		$	1,624		$	2,718,184

See accompanying notes to consolidated financial statements.

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Commerce Bancshares, Inc. and Subsidiaries

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

1. Summary of Significant Accounting Policies

Nature of Operations

Commerce Bancshares, Inc. and its subsidiaries (the Company) conducts its principal activities from approximately 330 locations throughout Missouri, Illinois, Kansas, Oklahoma and Colorado. Principal activities include retail and commercial banking, investment management, securities brokerage, mortgage banking, credit related insurance and private equity investment activities.

Basis of Presentation

The Company follows accounting principles generally accepted in the United States of America (GAAP) and reporting practices applicable to the banking industry. The preparation of financial statements under GAAP requires management to make estimates and assumptions that affect the amounts reported in the financial statements and notes. These estimates are based on information available to management at the time the estimates are made. While the consolidated financial statements reflect management’s best estimates and judgments, actual results could differ from those estimates. The consolidated financial statements include the accounts of the Company and its majority-owned subsidiaries (after elimination of all material intercompany balances and transactions). Certain prior year amounts have been reclassified to conform to the current year presentation. Such reclassifications had no effect on net income or total assets. Management has evaluated subsequent events for potential recognition or disclosure through the date these consolidated financial statements were issued.

The Company, in the normal course of business, engages in a variety of activities that involve variable interest entities (VIEs). A VIE is a legal entity that lacks equity investors or whose equity investors do not have a controlling financial interest in the entity through their equity investments. However, an enterprise is deemed to have a controlling financial interest and is the primary beneficiary of a VIE if it has both the power to direct the activities of the VIE that most significantly impact the VIE’s economic performance and an obligation to absorb losses or the right to receive benefits that could potentially be significant to the VIE. An enterprise that is the primary beneficiary must consolidate the VIE. The Company’s interests in VIEs are evaluated to determine if the Company is the primary beneficiary both at inception and when there is a change in circumstances that requires a reconsideration.

The Company is considered to be the primary beneficiary in a rabbi trust related to a deferred compensation plan offered to certain employees. The assets and liabilities of this trust, which are included in the accompanying consolidated balance sheets, are not significant. The Company also has variable interests in certain entities in which it is not the primary beneficiary. These entities are not consolidated. These interests include affordable housing limited partnership interests, holdings in its investment portfolio of various asset and mortgage-backed bonds that are issued by securitization trusts, and managed discretionary trust assets that are not included in the accompanying consolidated balance sheets.

Cash and Cash Equivalents

In the accompanying consolidated statements of cash flows, cash and cash equivalents include “Cash and due from banks”, “Federal funds sold and short-term securities purchased under agreements to resell”, and “Interest earning deposits with banks” as segregated in the accompanying consolidated balance sheets.

Regulations of the Federal Reserve System require cash balances to be maintained at the Federal Reserve Bank, based on certain deposit levels. The minimum reserve requirement for the Bank at December 31, 2017 totaled $126.1 million, while cash held at the Federal Reserve Bank totaled $30.6 million. Additionally, as of December 31, 2017, the Company had $12.5 million in cash collateral on deposit with another financial institution relating to interest rate swap transactions.

Loans and Related Earnings

Loans that management has the intent and ability to hold for the foreseeable future or until maturity or pay-off are reported at their outstanding principal balances, net of undisbursed loan proceeds, the allowance for loan losses, and any deferred fees and costs on originated loans. Origination fee income received on loans and amounts representing the estimated direct costs of origination are deferred and amortized to interest income over the life of the loan using the interest method.

Interest on loans is accrued based upon the principal amount outstanding. Interest income is recognized primarily on the level yield method. Loan and commitment fees, net of costs, are deferred and recognized in income over the term of the loan or commitment as an adjustment of yield. Annual fees charged on credit card loans are capitalized to principal and amortized over

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12 months to loan fees and sales. Other credit card fees, such as cash advance fees and late payment fees, are recognized in income as an adjustment of yield when charged to the cardholder’s account.

Non-Accrual Loans

Loans are placed on non-accrual status when management does not expect to collect payments consistent with acceptable and agreed upon terms of repayment. Business, construction real estate, business real estate, and personal real estate loans that are contractually 90 days past due as to principal and/or interest payments are generally placed on non-accrual, unless they are both well-secured and in the process of collection. Consumer, revolving home equity and credit card loans are exempt under regulatory rules from being classified as non-accrual. When a loan is placed on non-accrual status, any interest previously accrued but not collected is reversed against current income, and the loan is charged off to the extent uncollectible. Principal and interest payments received on non-accrual loans are generally applied to principal.Interest is included in income only after all previous loan charge-offs have been recovered and is recorded only as received. The loan is returned to accrual status only when the borrower has brought all past due principal and interest payments current, and, in the opinion of management, the borrower has demonstrated the ability to make future payments of principal and interest as scheduled. A six month history of sustained payment performance is generally required before reinstatement of accrual status.

Restructured Loans

A loan is accounted for as a troubled debt restructuring if the Company, for economic or legal reasons related to the borrowers’ financial difficulties, grants a concession to the borrower that it would not otherwise consider. A troubled debt restructuring typically involves (1) modification of terms such as a reduction of the stated interest rate, loan principal, or accrued interest, (2) a loan renewal at a stated interest rate lower than the current market rate for a new loan with similar risk, or (3) debt that was not reaffirmed in bankruptcy. Business, business real estate, construction real estate and personal real estate troubled debt restructurings with impairment charges are placed on non-accrual status. The Company measures the impairment loss of a troubled debt restructuring in the same manner as described below. Troubled debt restructurings which are performing under their contractual terms continue to accrue interest which is recognized in current earnings.

Impaired Loans

Loans are evaluated regularly by management for impairment. Included in impaired loans are all non-accrual loans, as well as loans that have been classified as troubled debt restructurings. Once a loan has been identified as impaired, impairment is measured based on either the present value of the expected future cash flows at the loan’s initial effective interest rate or the fair value of the collateral if collateral dependent. Factors considered in determining impairment include delinquency status, cash flow analysis, credit analysis, and collateral value and availability.

Loans Held For Sale

Loans held for sale include student loans and certain fixed rate residential mortgage loans. These loans are typically classified as held for sale upon origination based upon management's intent to sell the production of these loans. The student loans are carried at the lower of aggregate cost or fair value, and their fair value is determined based on sale contract prices. The mortgage loans are carried at fair value under the elected fair value option. Their fair value is based on secondary market prices for loans with similar characteristics, including an adjustment for embedded servicing value. Changes in fair value and gains and losses on sales are included in loan fees and sales. Deferred fees and costs related to these loans are not amortized but are recognized as part of the cost basis of the loan at the time it is sold. Interest income related to loans held for sale is accrued based on the principal amount outstanding and the loan's contractual interest rate.

Occasionally, other types of loans may be classified as held for sale in order to manage credit concentration. These loans are carried at the lower of cost or fair value with gains and losses on sales recognized in loan fees and sales.

Allowance/Provision for Loan Losses

The allowance for loan losses is maintained at a level believed to be appropriate by management to provide for probable loan losses inherent in the portfolio as of the balance sheet date, including losses on known or anticipated problem loans as well as for loans which are not currently known to require specific allowances. Management has established a process to determine the amount of the allowance for loan losses which assesses the risks and losses inherent in its portfolio. Business, construction real estate and business real estate loans are normally larger and more complex, and their collection rates are harder to predict. These loans are more likely to be collateral dependent and are allocated a larger reserve, due to their potential volatility. Personal real estate, credit card, consumer and revolving home equity loans are individually smaller and perform in a more homogenous manner, making loss estimates more predictable. Management’s process provides an allowance consisting of a specific allowance component based on certain individually evaluated loans and a general component based on estimates of reserves needed for pools of loans.

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Loans subject to individual evaluation generally consist of business, construction real estate, business real estate and personal real estate loans on non-accrual status. These impaired loans are evaluated individually for the impairment of repayment potential and collateral adequacy. Other impaired loans identified as performing troubled debt restructurings are collectively evaluated because they have similar risk characteristics. Loans which have not been identified as impaired are segregated by loan type and sub-type and are collectively evaluated. Reserves calculated for these loan pools are estimated using a consistent methodology that considers historical loan loss experience by loan type, loss emergence periods, delinquencies, current economic factors, loan risk ratings and industry concentrations.

The Company’s estimate of the allowance for loan losses and the corresponding provision for loan losses is based on various judgments and assumptions made by management. The amount of the allowance for loan losses is influenced by several qualitative factors which include collateral valuation, evaluation of performance and status, current loan portfolio composition and characteristics, trends in delinquencies, portfolio risk ratings, levels of non-performing assets, and prevailing regional and national economic and business conditions.

The estimates, appraisals, evaluations, and cash flows utilized by management may be subject to frequent adjustments due to changing economic prospects of borrowers or properties. These estimates are reviewed periodically and adjustments, if necessary, are recorded in the provision for loan losses in the periods in which they become known.

Loans, or portions of loans, are charged off to the extent deemed uncollectible. Loan charge-offs reduce the allowance for loan losses, and recoveries of loans previously charged off are added back to the allowance. Business, business real estate, construction real estate and personal real estate loans are generally charged down to estimated collectible balances when they are placed on non-accrual status. Consumer loans and related accrued interest are normally charged down to the fair value of related collateral (or are charged off in full if no collateral) once the loans are more than 120 days delinquent. Credit card loans are charged off against the allowance for loan losses when the receivable is more than 180 days past due. The interest and fee income previously capitalized but not collected on credit card charge-offs is reversed against interest income.

Operating, Direct Financing and Sales Type Leases

The net investment in direct financing and sales type leases is included in loans on the Company’s consolidated balance sheets and consists of the present values of the sum of the future minimum lease payments and estimated residual value of the leased asset. Revenue consists of interest earned on the net investment and is recognized over the lease term as a constant percentage return thereon. The net investment in operating leases is included in other assets on the Company’s consolidated balance sheets. It is carried at cost, less the amount depreciated to date. Depreciation is recognized, on the straight-line basis, over the lease term to the estimated residual value. Operating lease revenue consists of the contractual lease payments and is recognized over the lease term in other non-interest income. Estimated residual values are established at lease inception utilizing contract terms, past customer experience, and general market data and are reviewed and adjusted, if necessary, on an annual basis.

Investments in Debt and Equity Securities

The Company has classified the majority of its investment portfolio as available for sale. From time to time, the Company sells securities and utilizes the proceeds to reduce borrowings, fund loan growth, or modify its interest rate profile. Securities classified as available for sale are carried at fair value. Changes in fair value, excluding certain losses associated with other-than-temporary impairment (OTTI), are reported in other comprehensive income (loss), a component of stockholders’ equity. Securities are periodically evaluated for OTTI in accordance with guidance provided in ASC 320-10-35. For securities with OTTI, the entire loss in fair value is required to be recognized in current earnings if the Company intends to sell the securities or believes it likely that it will be required to sell the security before the anticipated recovery. If neither condition is met, but the Company does not expect to recover the amortized cost basis, the Company determines whether a credit loss has occurred, and the loss is then recognized in current earnings. The noncredit-related portion of the overall loss is reported in other comprehensive income (loss). Gains and losses realized upon sales of securities are calculated using the specific identification method and are included in investment securities gains (losses), net, in the consolidated statements of income. Purchase premiums and discounts are amortized to interest income using a level yield method over the estimated lives of the securities. For mortgage and asset-backed securities, prepayment experience is evaluated quarterly to determine the appropriate estimate of the future rate of prepayment. When a change in a bond's estimated remaining life is necessary, a corresponding adjustment is made in the related amortization of premium or discount accretion.

Non-marketable securities include certain private equity investments, consisting of both debt and equity instruments. These securities are carried at fair value in accordance with ASC 946-10-15, with changes in fair value reported in current earnings. In the absence of readily ascertainable market values, fair value is estimated using internally developed models. Changes in fair value and gains and losses from sales are included in investment securities gains (losses), net in the consolidated statements of

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income. Other non-marketable securities acquired for debt and regulatory purposes are carried at cost and periodically evaluated for other-than-temporary impairment.

Trading account securities, which are bought and held principally for the purpose of resale in the near term, are carried at fair value. Gains and losses, both realized and unrealized, are recorded in non-interest income.

Purchases and sales of securities are recognized on a trade date basis. A receivable or payable is recognized for pending transaction settlements.    

Securities Purchased under Agreements to Resell and Securities Sold under Agreements to Repurchase

Securities purchased under agreements to resell and securities sold under agreements to repurchase are treated as collateralized financing transactions, not as purchases and sales of the underlying securities. The agreements are recorded at the amount of cash advanced or received.

The Company periodically enters into securities purchased under agreements to resell with large financial institutions. Securities pledged by the counterparties to secure these agreements are delivered to a third party custodian.

Securities sold under agreements to repurchase are a source of funding to the Company and are offered to cash management customers as an automated, collateralized investment account. From time to time, securities sold may also be used by the Bank to obtain additional borrowed funds at favorable rates. These borrowings are secured by a portion of the Company's investment security portfolio and delivered either to the dealer custody account at the FRB or to the applicable counterparty.

The fair value of collateral either received from or provided to a counterparty is monitored daily, and additional collateral is obtained, returned, or provided by the Company in order to maintain full collateralization for these transactions.

As permitted by current accounting guidance, the Company offsets certain securities purchased under agreements to resell against securities sold under agreements to repurchase in its balance sheet presentation. These agreements are further discussed in Note 18, Resale and Repurchase Agreements.

Land, Buildings and Equipment

Land is stated at cost, and buildings and equipment are stated at cost, including capitalized interest when appropriate, less accumulated depreciation. Depreciation is computed using a straight-line method, utilizing estimated useful lives; generally 30 years for buildings, 10 years for building improvements, and 3 to 10 years for equipment. Leasehold improvements are amortized over the shorter of 10 years or the remaining lease term. Maintenance and repairs are charged to non-interest expense as incurred.

Foreclosed Assets

Foreclosed assets consist of property that has been repossessed and is comprised of commercial and residential real estate and other non-real estate property, including auto and recreational and marine vehicles. The assets are initially recorded at fair value less estimated selling costs, establishing a new cost basis. Initial valuation adjustments are charged to the allowance for loan losses. Fair values are estimated primarily based on appraisals, third-party price opinions, or internally developed pricing models. After initial recognition, fair value estimates are updated periodically. Declines in fair value below cost are recognized through valuation allowances which may be reversed when supported by future increases in fair value. These valuation adjustments, in addition to gains and losses realized on sales and net operating expenses, are recorded in other non-interest expense.

Goodwill and Intangible Assets

Goodwill is not amortized but is assessed for impairment on an annual basis or more frequently in certain circumstances. When testing for goodwill impairment, the Company may initially perform a qualitative assessment. Based on the results of this qualitative assessment, if the Company concludes it is more likely than not that a reporting unit's fair value is less than its carrying amount, a quantitative analysis is performed. Quantitative valuation methodologies include a combination of formulas using current market multiples, based on recent sales of financial institutions within the Company's geographic marketplace. If the fair value of a reporting unit is less than the carrying amount, additional analysis is required to measure the amount of impairment. The Company has not recorded impairment resulting from goodwill impairment tests. However, adverse changes in the economic environment, operations of the reporting unit, or other factors could result in a decline in fair value.

Intangible assets that have finite useful lives, such as core deposit intangibles and mortgage servicing rights, are amortized over their estimated useful lives. Core deposit intangibles are amortized over periods of 8 to 14 years, representing their estimated lives, using accelerated methods. Mortgage servicing rights are amortized in proportion to and over the period of estimated net

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servicing income, considering appropriate prepayment assumptions. Core deposit intangibles are reviewed for impairment whenever events or changes in circumstances indicate their carrying amount may not be recoverable. Impairment is indicated if the sum of the undiscounted estimated future net cash flows is less than the carrying value of the intangible asset. Mortgage servicing rights, while initially recorded at fair value, are subsequently amortized and carried at the lower of the initial capitalized amount (net of accumulated amortization), or estimated fair value. The Company evaluates its mortgage servicing rights for impairment on a quarterly basis, using estimated prepayment speeds of the underlying mortgage loans serviced and stratifications based on the risk characteristics of the underlying loans. A valuation allowance has been established, through a charge to earnings, to the extent the amortized cost exceeds the estimated fair value. However, the Company has not recorded other-than-temporary impairment losses on either of these types of intangible assets.

Income Taxes

Amounts provided for income tax expense are based on income reported for financial statement purposes and do not necessarily represent amounts currently payable under tax laws. Deferred income taxes are provided for temporary differences between the financial reporting bases and income tax bases of the Company’s assets and liabilities, net operating losses, and tax credit carryforwards. Deferred tax assets and liabilities are measured using the enacted tax rates that are expected to apply to taxable income when such assets and liabilities are anticipated to be settled or realized. The effect on deferred tax assets and liabilities of a change in tax rates is recognized as tax expense or benefit in the period that includes the enactment date of the change. In determining the amount of deferred tax assets to recognize in the financial statements, the Company evaluates the likelihood of realizing such benefits in future periods. A valuation allowance is established if it is more likely than not that all or some portion of the deferred tax asset will not be realized. The Company recognizes interest and penalties related to income taxes within income tax expense in the consolidated statements of income.

The Company and its eligible subsidiaries file a consolidated federal income tax return. State and local income tax returns are filed on a combined, consolidated or separate return basis based upon each jurisdiction’s laws and regulations.

In December 2017, tax reform legislation was enacted which changed the maximum corporate tax rate for years 2018 and beyond. As such, deferred tax assets and liabilities were revalued in 2017 to account for the change in future tax rates. Additional information about current and deferred income taxes is provided in Note 8, Income Taxes.

Derivatives

While the Company’s interest rate risk management policy permits the use of hedge accounting for derivatives, all of the derivatives held by the Company during the past several years have been accounted for as free-standing instruments. These instruments are carried at fair value, and changes in fair value are recognized in current earnings. They include interest rate swaps and caps, which are offered to customers to assist in managing their risks of adverse changes in interest rates. Each contract between the Company and a customer is offset by a contract between the Company and an institutional counterparty, thus minimizing the Company's exposure to rate changes. The Company also enters into certain contracts, known as credit risk participation agreements, to buy or sell credit protection on specific interest rate swaps. It also purchases and sells forward foreign exchange contracts, either in connection with customer transactions, or for its own trading purposes. In 2015, the Company began an origination and sales program of certain personal real estate mortgages. Derivative instruments under this program include mortgage loan commitments, forward loan sale contracts, and forward contracts to sell certain to-be-announced (TBA) securities.

The Company has master netting arrangements with various counterparties but does not offset derivative assets and liabilities under these arrangements in its consolidated balance sheets. However, interest rate swaps that are executed under central clearing requirements are presented on a net basis as mandated by the statutory terms of the Company's contract with its clearing counterparty.

Additional information about derivatives held by the Company and valuation methods employed is provided in Note 15, Fair Value Measurements and Note 17, Derivative Instruments.

Pension Plan

The Company’s pension plan is described in Note 9, Employee Benefit Plans. The funded status of the plan is recognized as an asset or liability in the consolidated balance sheets, and changes in that funded status are recognized in the year in which the changes occur through other comprehensive income. Plan assets and benefit obligations are measured as of fiscal year end. The measurement of the projected benefit obligation and pension expense involve actuarial valuation methods and the use of various actuarial and economic assumptions. The Company monitors the assumptions and updates them periodically. Due to the long-term nature of the pension plan obligation, actual results may differ significantly from estimations. Such differences are adjusted over time as the assumptions are replaced by facts and values are recalculated.

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Stock-Based Compensation

The Company’s stock-based employee compensation plan is described in Note 10, Stock-Based Compensation and Directors Stock Purchase Plan. In accordance with the requirements of ASC 718-10-30-3 and 35-2, the Company measures the cost of stock-based compensation based on the grant-date fair value of the award, recognizing the cost over the requisite service period, which is generally the vesting period. The fair value of an option award is estimated using the Black-Scholes option-pricing model while the fair value of a nonvested stock award is the common stock (CBSH) market price. The expense recognized is reduced for estimated forfeitures over the vesting period and adjusted for actual forfeitures as they occurred, and was included in salaries and employee benefits in the accompanying consolidated statements of income. As further discussed in Note 10, effective January 1, 2017, the Company recognized forfeitures as a reduction to expense only when they have occurred, as allowed under the provisions of ASU 2016-09.

Comprehensive Income

Comprehensive income includes all changes in stockholders’ equity during a period, except those resulting from transactions with stockholders. In addition to net income, other components of the Company’s comprehensive income include the after tax effect of changes in net unrealized gain / loss on securities available for sale and changes in net actuarial gain / loss on defined benefit post-retirement plans. Comprehensive income is reported in the accompanying consolidated statements of comprehensive income. See Note 11 for additional information on accumulated other comprehensive income (loss).

Treasury Stock

Purchases of the Company’s common stock are recorded at cost. Upon re-issuance for acquisitions, exercises of stock-based awards or other corporate purposes, treasury stock is reduced based upon the average cost basis of shares held.

Income per Share

Basic income per share is computed using the weighted average number of common shares outstanding during each year. Diluted income per share includes the effect of all dilutive potential common shares (primarily stock options and stock appreciation rights) outstanding during each year. The Company applies the two-class method of computing income per share. The two-class method is an earnings allocation formula that determines income per share for common stock and for participating securities, according to dividends declared and participation rights in undistributed earnings. The Company’s nonvested stock awards are considered to be a class of participating security. All per share data has been restated to reflect the 5% stock dividend distributed in December 2017.

2. Loans and Allowance for Loan Losses

Major classifications within the Company’s held for investment loan portfolio at December 31, 2017 and 2016 are as follows:

(In thousands)	2017		2016
Commercial:
Business	$	4,958,554	$	4,776,365
Real estate — construction and land	968,820		791,236
Real estate — business	2,697,452		2,643,374
Personal Banking:
Real estate — personal	2,062,787		2,010,397
Consumer	2,104,487		1,990,801
Revolving home equity	400,587		413,634
Consumer credit card	783,864		776,465
Overdrafts	7,123		10,464
Total loans	$	13,983,674	$	13,412,736

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Loans to directors and executive officers of the Parent and the Bank, and to their associates, are summarized as follows:

(In thousands)
Balance at January 1, 2017	$	62,991
Additions	655,544
Amounts collected	(639,920		)
Amounts written off	—
Balance, December 31, 2017	$	78,615

Management believes all loans to directors and executive officers have been made in the ordinary course of business with normal credit terms, including interest rate and collateral considerations, and do not represent more than a normal risk of collection. The activity in the table above includes draws and repayments on several lines of credit with business entities. There were no outstanding loans at December 31, 2017 to principal holders (over 10% ownership) of the Company’s common stock.

The Company’s lending activity is generally centered in Missouri, Illinois, Kansas and other nearby states including Oklahoma, Colorado, Iowa, Ohio, Texas, and others. The Company maintains a diversified portfolio with limited industry concentrations of credit risk. Loans and loan commitments are extended under the Company’s normal credit standards, controls, and monitoring features. Most loan commitments are short or intermediate term in nature. Commercial loan maturities generally range from three to seven years. Collateral is commonly required and would include such assets as marketable securities and cash equivalent assets, accounts receivable and inventory, equipment, other forms of personal property, and real estate. At December 31, 2017, unfunded loan commitments totaled $10.8 billion (which included $5.1 billion in unused approved lines of credit related to credit card loan agreements) which could be drawn by customers subject to certain review and terms of agreement. At December 31, 2017, loans totaling $3.8 billion were pledged at the FHLB as collateral for borrowings and letters of credit obtained to secure public deposits. Additional loans of $1.7 billion were pledged at the Federal Reserve Bank as collateral for discount window borrowings.

The Company has a net investment in direct financing and sales type leases to commercial and industrial and tax-exempt entities of $737.7 million and $725.3 million at December 31, 2017 and 2016, respectively, which is included in business loans on the Company’s consolidated balance sheets. This investment includes deferred income of $52.1 million and $49.9 million at December 31, 2017 and 2016, respectively. The net investment in operating leases amounted to $17.4 million and $19.0 million at December 31, 2017 and 2016, respectively, and is included in other assets on the Company’s consolidated balance sheets.

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Allowance for loan losses

A summary of the activity in the allowance for losses during the previous three years follows:

(In thousands)	Commercial			Personal Banking		Total
Balance at December 31, 2014	$	89,622		$	66,910	$	156,532
Provision for loan losses	(9,319		)	38,046		28,727
Deductions:
Loans charged off	4,057			46,993		51,050
Less recoveries	5,840			11,483		17,323
Net loans charged off (recoveries)	(1,783		)	35,510		33,727
Balance at December 31, 2015	82,086			69,446		151,532
Provision for loan losses	4,898			31,420		36,318
Deductions:
Loans charged off	3,258			47,720		50,978
Less recoveries	7,635			11,425		19,060
Net loans charged off (recoveries)	(4,377		)	36,295		31,918
Balance at December 31, 2016	91,361			64,571		155,932
Provision for loan losses	2,327			42,917		45,244
Deductions:
Loans charged off	2,538			52,641		55,179
Less recoveries	2,554			10,981		13,535
Net loans charged off (recoveries)	(16		)	41,660		41,644
Balance at December 31, 2017	$	93,704		$	65,828	$	159,532

The following table shows the balance in the allowance for loan losses and the related loan balance at December 31, 2017 and 2016, disaggregated on the basis of impairment methodology. Impaired loans evaluated under ASC 310-10-35 include loans on non-accrual status which are individually evaluated for impairment and other impaired loans deemed to have similar risk characteristics, which are collectively evaluated. All other loans are collectively evaluated for impairment under ASC 450-20.

	Impaired Loans				All Other Loans
(In thousands)	Allowance for Loan Losses		Loans Outstanding		Allowance for Loan Losses		Loans Outstanding
December 31, 2017
Commercial	$	3,067	$	92,613	$	90,637	$	8,532,213
Personal Banking	1,176		22,182		64,652		5,336,666
Total	$	4,243	$	114,795	$	155,289	$	13,868,879
December 31, 2016
Commercial	$	1,817	$	44,795	$	89,544	$	8,166,180
Personal Banking	1,292		19,737		63,279		5,182,024
Total	$	3,109	$	64,532	$	152,823	$	13,348,204

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Impaired loans

The table below shows the Company’s investment in impaired loans at December 31, 2017 and 2016. These loans consist of all loans on non-accrual status and other restructured loans whose terms have been modified and classified as troubled debt restructurings under current accounting guidance. These restructured loans are performing in accordance with their modified terms, and because the Company believes it probable that all amounts due under the modified terms of the agreements will be collected, interest on these loans is being recognized on an accrual basis. They are discussed further in the "Troubled debt restructurings" section on page 78.

(In thousands)	2017		2016
Non-accrual loans	$	11,983	$	14,283
Restructured loans (accruing)	102,812		50,249
Total impaired loans	$	114,795	$	64,532

The following table provides additional information about impaired loans held by the Company at December 31, 2017 and 2016, segregated between loans for which an allowance for credit losses has been provided and loans for which no allowance has been provided.

(In thousands)	Recorded Investment		Unpaid Principal Balance		Related Allowance
December 31, 2017
With no related allowance recorded:
Business	$	5,356	$	9,000	$	—
Real estate – business	1,299		1,303		—
Consumer	779		817		—
	$	7,434	$	11,120	$	—
With an allowance recorded:
Business	$	72,589	$	73,168	$	2,455
Real estate – construction and land	837		841		27
Real estate – business	12,532		13,071		585
Real estate – personal	9,126		11,914		532
Consumer	5,388		5,426		67
Revolving home equity	204		204		11
Consumer credit card	6,685		6,685		566
	$	107,361	$	111,309	$	4,243
Total	$	114,795	$	122,429	$	4,243
December 31, 2016
With no related allowance recorded:
Business	$	7,375	$	10,470	$	—
Real estate – construction and land	557		752		—
	$	7,932	$	11,222	$	—
With an allowance recorded:
Business	$	29,924	$	31,795	$	1,318
Real estate – construction and land	69		72		3
Real estate – business	6,870		8,072		496
Real estate – personal	6,394		9,199		642
Consumer	5,281		5,281		57
Revolving home equity	584		584		1
Consumer credit card	7,478		7,478		592
	$	56,600	$	62,481	$	3,109
Total	$	64,532	$	73,703	$	3,109

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Total average impaired loans during 2017 and 2016 are shown in the table below.

	2017						2016
(In thousands)	Commercial		Personal Banking		Total		Commercial		Personal Banking		Total
Average impaired loans:
Non-accrual loans	$	9,658	$	3,989	$	13,647	$	17,294	$	4,135	$	21,429
Restructured loans (accruing)	49,070		17,539		66,609		32,295		17,058		49,353
Total	$	58,728	$	21,528	$	80,256	$	49,589	$	21,193	$	70,782

The table below shows interest income recognized during the years ended December 31, 2017, 2016 and 2015 for impaired loans held at the end of each respective period. This interest relates to accruing restructured loans, as discussed previously.

	Years Ended December 31
(In thousands)	2017		2016		2015
Interest income recognized on impaired loans:
Business	$	3,135	$	1,064	$	495
Real estate – construction and land	41		2		80
Real estate – business	514		171		122
Real estate – personal	402		152		187
Consumer	307		339		348
Revolving home equity	10		31		20
Consumer credit card	673		722		750
Total	$	5,082	$	2,481	$	2,002

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Delinquent and non-accrual loans

The following table provides aging information on the Company’s past due and accruing loans, in addition to the balances of loans on non-accrual status, at December 31, 2017 and 2016.

(In thousands)	Current or Less Than 30 Days Past Due		30 – 89 Days Past Due		90 Days Past Due and Still Accruing		Non-accrual		Total
December 31, 2017
Commercial:
Business	$	4,949,148	$	3,085	$	374	$	5,947	$	4,958,554
Real estate – construction and land	967,321		1,473		21		5		968,820
Real estate – business	2,694,234		482		—		2,736		2,697,452
Personal Banking:
Real estate – personal	2,050,787		6,218		3,321		2,461		2,062,787
Consumer	2,067,025		32,674		3,954		834		2,104,487
Revolving home equity	397,349		1,962		1,276		—		400,587
Consumer credit card	764,568		10,115		9,181		—		783,864
Overdrafts	6,840		283		—		—		7,123
Total	$	13,897,272	$	56,292	$	18,127	$	11,983	$	13,983,674
December 31, 2016
Commercial:
Business	$	4,763,274	$	3,735	$	674	$	8,682	$	4,776,365
Real estate – construction and land	789,633		1,039		—		564		791,236
Real estate – business	2,639,586		2,154		—		1,634		2,643,374
Personal Banking:
Real estate – personal	1,995,724		9,162		2,108		3,403		2,010,397
Consumer	1,957,358		29,783		3,660		—		1,990,801
Revolving home equity	411,483		1,032		1,119		—		413,634
Consumer credit card	757,443		10,187		8,835		—		776,465
Overdrafts	10,014		450		—		—		10,464
Total	$	13,324,515	$	57,542	$	16,396	$	14,283	$	13,412,736

Credit quality

The following table provides information about the credit quality of the Commercial loan portfolio, using the Company’s internal rating system as an indicator. The internal rating system is a series of grades reflecting management’s risk assessment, based on its analysis of the borrower’s financial condition. The “pass” category consists of a range of loan grades that reflect increasing, though still acceptable, risk. Movement of risk through the various grade levels in the “pass” category is monitored for early identification of credit deterioration. The “special mention” rating is attached to loans where the borrower exhibits material negative financial trends due to borrower specific or systemic conditions that, if left uncorrected, threaten its capacity to meet its debt obligations. The borrower is believed to have sufficient financial flexibility to react to and resolve its negative financial situation. It is a transitional grade that is closely monitored for improvement or deterioration. The “substandard” rating is applied to loans where the borrower exhibits well-defined weaknesses that jeopardize its continued performance and are of a severity that the distinct possibility of default exists. Loans are placed on “non-accrual” when management does not expect to collect payments consistent with acceptable and agreed upon terms of repayment, as discussed in Note 1.

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	Commercial Loans
(In thousands)	Business		Real Estate -Construction		Real Estate - Business		Total
December 31, 2017
Pass	$	4,740,013	$	955,499	$	2,593,005	$	8,288,517
Special mention	59,177		10,614		50,577		120,368
Substandard	153,417		2,702		51,134		207,253
Non-accrual	5,947		5		2,736		8,688
Total	$	4,958,554	$	968,820	$	2,697,452	$	8,624,826
December 31, 2016
Pass	$	4,607,553	$	788,778	$	2,543,348	$	7,939,679
Special mention	116,642		722		45,479		162,843
Substandard	43,488		1,172		52,913		97,573
Non-accrual	8,682		564		1,634		10,880
Total	$	4,776,365	$	791,236	$	2,643,374	$	8,210,975

The credit quality of Personal Banking loans is monitored primarily on the basis of aging/delinquency, and this information is provided in the table in the above section on "Delinquent and non-accrual loans". In addition, FICO scores are obtained and updated on a quarterly basis for most of the loans in the Personal Banking portfolio. This is a published credit score designed to measure the risk of default by taking into account various factors from a person's financial history. The bank normally obtains a FICO score at the loan's origination and renewal dates, and updates are obtained on a quarterly basis. Excluded from the table below are certain personal real estate loans for which FICO scores are not obtained because the loans are related to commercial activity. These loans totaled $219.2 million at December 31, 2017 and $237.2 million at December 31, 2016. The table also excludes consumer loans related to the Company's patient healthcare loan program, which totaled $145.0 million at December 31, 2017 and $75.4 million at December 31, 2016. As the healthcare loans are guaranteed by the hospital, FICO scores are not considered relevant for this program. The personal real estate loans and consumer loans excluded below totaled less than 7% of the Personal Banking portfolio. For the remainder of loans in the Personal Banking portfolio, the table below shows the percentage of balances outstanding at December 31, 2017 and 2016 by FICO score.

	Personal Banking Loans
	% of Loan Category
	Real Estate - Personal		Consumer		Revolving Home Equity		Consumer Credit Card
December 31, 2017
FICO score:
Under 600	1.3	%	3.3	%	1.1	%	4.7	%
600 – 659	2.1		5.5		1.7		14.4
660 – 719	10.5		17.3		9.5		34.4
720 – 779	25.6		26.8		21.4		26.0
780 and over	60.5		47.1		66.3		20.5
Total	100.0	%	100.0	%	100.0	%	100.0	%
December 31, 2016
FICO score:
Under 600	1.3	%	3.4	%	1.0	%	4.9	%
600 – 659	2.6		6.4		1.8		15.5
660 – 719	10.4		19.7		9.7		34.9
720 – 779	25.4		26.3		21.1		25.1
780 and over	60.3		44.2		66.4		19.6
Total	100.0	%	100.0	%	100.0	%	100.0	%

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Troubled debt restructurings

As mentioned previously, the Company's impaired loans include loans which have been classified as troubled debt restructurings. Restructured loans are those extended to borrowers who are experiencing financial difficulty and who have been granted a concession. Restructured loans are placed on non-accrual status if the Company does not believe it probable that amounts due under the contractual terms will be collected. Other performing restructured loans are comprised of certain business, construction and business real estate loans classified as substandard. Upon maturity, the loans renewed at interest rates judged not to be market rates for new debt with similar risk and as a result were classified as troubled debt restructurings. These loans are performing in accordance with their modified terms, and because the Company believes it probable that all amounts due under the modified terms of the agreements will be collected, interest on these loans is being recognized on an accrual basis. Performing restructured loans at rates judged to be below market increased $54.1 million at year end 2017 compared to year end 2016 due to several large loan renewals in 2017, including a single business loan of $31.9 million.

Troubled debt restructurings also include certain credit card loans under various debt management and assistance programs. Modifications to credit card loans generally involve removing the available line of credit, placing loans on amortizing status, and lowering the contractual interest rate. The Company also classified certain loans as troubled debt restructurings because they were not reaffirmed by the borrower in bankruptcy proceedings. These loans are comprised of personal real estate, revolving home equity and consumer loans. Interest on these loans is being recognized on an accrual basis, as the borrowers are continuing to make payments.

The table below summarizes the troubled debt restructurings outstanding by type of modification, as described above.

		December 31
(In thousands)		2017		2016
Accruing loans:
	Non-market interest rates	$	88,588	$	34,531
	Assistance programs	6,685		7,478
	Bankruptcy non-affirmation	7,283		7,937
	Other	256		303
Non-accrual loans		7,796		8,825
Total restructured loans		$	110,608	$	59,074

The table below shows the balance of troubled debt restructurings by loan classification at December 31, 2017, in addition to the period end balances of restructured loans which the Company considers to have been in default at any time during the past twelve months. For purposes of this disclosure, the Company considers "default" to mean 90 days or more past due as to interest or principal.

(In thousands)	December 31, 2017		Balance 90 days past due at any time during previous 12 months
Commercial:
Business	$	77,400	$	—
Real estate – construction and land	776		—
Real estate – business	12,394		—
Personal Banking:
Real estate – personal	7,760		278
Consumer	5,389		81
Revolving home equity	204		42
Consumer credit card	6,685		630
Total restructured loans	$	110,608	$	1,031

For those loans on non-accrual status also classified as restructured, the modification did not create any further financial effect on the Company as those loans were already recorded at net realizable value. For those performing commercial loans classified as restructured, there were no concessions involving forgiveness of principal or interest and, therefore, there was no financial impact to the Company as a result of modification to these loans. No financial impact resulted from those performing loans where

78

the debt was not reaffirmed in bankruptcy, as no changes to loan terms occurred in that process. However, the effects of modifications to consumer credit card loans were estimated to decrease interest income by approximately $1.0 million on an annual, pre-tax basis, compared to amounts contractually owed.

The allowance for loan losses related to troubled debt restructurings on non-accrual status is determined by individual evaluation, including collateral adequacy, using the same process as loans on non-accrual status which are not classified as troubled debt restructurings. Those performing loans classified as troubled debt restructurings are accruing loans which management expects to collect under contractual terms. Performing commercial loans have had no other concessions granted other than being renewed at an interest rate judged not to be market. As such, they have similar risk characteristics as non-troubled debt commercial loans and are collectively evaluated based on internal risk rating, loan type, delinquency, historical experience and current economic factors. Performing personal banking loans classified as troubled debt restructurings resulted from the borrower not reaffirming the debt during bankruptcy and have had no other concession granted, other than the Bank's future limitations on collecting payment deficiencies or in pursuing foreclosure actions. As such, they have similar risk characteristics as non-troubled debt personal banking loans and are evaluated collectively based on loan type, delinquency, historical experience and current economic factors.

If a troubled debt restructuring defaults and is already on non-accrual status, the allowance for loan losses continues to be based on individual evaluation, using discounted expected cash flows or the fair value of collateral. If an accruing, troubled debt restructuring defaults, the loan's risk rating is downgraded to non-accrual status and the loan's related allowance for loan losses is determined based on individual evaluation, or if necessary, the loan is charged off and collection efforts begin.

The Company had commitments of $7.6 million at December 31, 2017 to lend additional funds to borrowers with restructured loans, compared to $10.3 million at December 31, 2016.

Loans held for sale

The Company designates certain long-term fixed rate personal real estate loan originations as held for sale, and the Company has elected the fair value option for these loans. The election of the fair value option aligns the accounting for these loans with the related economic hedges discussed in Note 17. The loans are primarily sold to FNMA, FHLMC, and GNMA. At December 31, 2017, the fair value of these loans was $15.3 million, and the unpaid principal balance was $14.8 million.

The Company also designates certain student loan originations as held for sale. The borrowers are credit-worthy students who are attending colleges and universities. The loans are intended to be sold in the secondary market, and the Company maintains contracts with Sallie Mae to sell the loans within 210 days after the last disbursement to the student. These loans are carried at lower of cost or fair value, which at December 31, 2017 totaled $6.1 million.

At December 31, 2017, none of the loans held for sale were past due or on non-accrual status.

Foreclosed real estate/repossessed assets

The Company’s holdings of foreclosed real estate totaled $681 thousand and $366 thousand at December 31, 2017 and 2016, respectively. Personal property acquired in repossession, generally autos and marine and recreational vehicles, totaled $2.7 million and $2.2 million at December 31, 2017 and 2016, respectively. Upon acquisition, these assets are recorded at fair value less estimated selling costs at the date of foreclosure, establishing a new cost basis. They are subsequently carried at the lower of this cost basis or fair value less estimated selling costs.

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3. Investment Securities

Investment securities, at fair value, consisted of the following at December 31, 2017 and 2016.

(In thousands)	2017		2016
Available for sale:
U.S. government and federal agency obligations	$	917,147	$	920,904
Government-sponsored enterprise obligations	406,363		449,998
State and municipal obligations	1,611,366		1,778,214
Agency mortgage-backed securities	3,040,913		2,685,931
Non-agency mortgage-backed securities	905,793		1,055,639
Asset-backed securities	1,492,800		2,381,301
Other debt securities	351,060		325,953
Equity securities	48,838		51,263
Total available for sale	8,774,280		9,649,203
Trading	18,269		22,225
Non-marketable	100,758		99,558
Total investment securities	$	8,893,307	$	9,770,986

Most of the Company’s investment securities are classified as available for sale, and this portfolio is discussed in more detail below. Securities which are classified as non-marketable include Federal Home Loan Bank (FHLB) stock and Federal Reserve Bank stock held for borrowing and regulatory purposes, which totaled $43.3 million and $46.9 million at December 31, 2017 and 2016, respectively. Investment in Federal Reserve Bank stock is based on the capital structure of the investing bank, and investment in FHLB stock is mainly tied to the level of borrowings from the FHLB. These holdings are carried at cost. Non-marketable securities also include private equity investments, which amounted to $57.2 million and $52.3 million at December 31, 2017 and 2016, respectively. In the absence of readily ascertainable market values, these securities are carried at estimated fair value.

A summary of the available for sale investment securities by maturity groupings as of December 31, 2017 is shown in the following table. The weighted average yield for each range of maturities was calculated using the yield on each security within that range weighted by the amortized cost of each security at December 31, 2017. Yields on tax exempt securities have not been adjusted for tax exempt status. The investment portfolio includes agency mortgage-backed securities, which are guaranteed by agencies such as FHLMC, FNMA, GNMA and FDIC, in addition to non-agency mortgage-backed securities which have no guarantee, but are collateralized by residential and commercial mortgages. Also included are certain other asset-backed securities, primarily collateralized by credit cards, automobiles and commercial loans. The Company does not have exposure to subprime-originated mortgage-backed or collateralized debt obligation instruments, and does not hold any trust preferred securities.

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(Dollars in thousands)	Amortized Cost		Fair Value		Weighted Average Yield
U.S. government and federal agency obligations:
Within 1 year	$	57,983	$	58,347	1.71
After 1 but within 5 years	641,114		639,192		1.45
After 5 but within 10 years	149,589		149,927		.43
After 10 years	68,808		69,681		.59
Total U.S. government and federal agency obligations	917,494		917,147		1.24
Government-sponsored enterprise obligations:
Within 1 year	215,763		215,434		1.35
After 1 but within 5 years	121,575		121,199		1.93
After 5 but within 10 years	34,983		34,870		2.71
After 10 years	35,945		34,860		3.00
Total government-sponsored enterprise obligations	408,266		406,363		1.79
State and municipal obligations:
Within 1 year	164,756		165,638		2.65
After 1 but within 5 years	665,351		670,953		2.21
After 5 but within 10 years	709,248		721,181		2.46
After 10 years	53,352		53,594		3.01
Total state and municipal obligations	1,592,707		1,611,366		2.39
Mortgage and asset-backed securities:
Agency mortgage-backed securities	3,046,701		3,040,913		2.62
Non-agency mortgage-backed securities	903,920		905,793		2.54
Asset-backed securities	1,495,380		1,492,800		2.03
Total mortgage and asset-backed securities	5,446,001		5,439,506		2.45
Other debt securities:
Within 1 year	10,390		10,389
After 1 but within 5 years	247,181		247,626
After 5 but within 10 years	93,417		93,045
Total other debt securities	350,988		351,060
Equity securities	4,411		48,838
Total available for sale investment securities	$	8,719,867	$	8,774,280

* Rate does not reflect inflation adjustment on inflation-protected securities

Investments in U.S. government securities include U.S. Treasury inflation-protected securities, which totaled $442.1 million, at fair value, at December 31, 2017. Interest paid on these securities increases with inflation and decreases with deflation, as measured by the Consumer Price Index. At maturity, the principal paid is the greater of an inflation-adjusted principal or the original principal. Included in state and municipal obligations are $17.0 million, at fair value, of auction rate securities, which were purchased from bank customers in 2008. Interest on these bonds is currently being paid at the maximum failed auction rates. Equity securities are primarily comprised of investments in common stock held by the Parent, which totaled $45.9 million, at fair value, at December 31, 2017.

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For securities classified as available for sale, the following table shows the unrealized gains and losses (pre-tax) in accumulated other comprehensive income, by security type.

(In thousands)	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
December 31, 2017
U.S. government and federal agency obligations	$	917,494	$	4,096	$	(4,443	)	$	917,147
Government-sponsored enterprise obligations	408,266		26		(1,929		)	406,363
State and municipal obligations	1,592,707		21,413		(2,754		)	1,611,366
Mortgage and asset-backed securities:
Agency mortgage-backed securities	3,046,701		17,956		(23,744		)	3,040,913
Non-agency mortgage-backed securities	903,920		6,710		(4,837		)	905,793
Asset-backed securities	1,495,380		2,657		(5,237		)	1,492,800
Total mortgage and asset-backed securities	5,446,001		27,323		(33,818		)	5,439,506
Other debt securities	350,988		1,250		(1,178		)	351,060
Equity securities	4,411		44,427		—			48,838
Total	$	8,719,867	$	98,535	$	(44,122	)	$	8,774,280
December 31, 2016
U.S. government and federal agency obligations	$	919,904	$	7,312	$	(6,312	)	$	920,904
Government-sponsored enterprise obligations	450,448		1,126		(1,576		)	449,998
State and municipal obligations	1,778,684		12,223		(12,693		)	1,778,214
Mortgage and asset-backed securities:
Agency mortgage-backed securities	2,674,964		31,610		(20,643		)	2,685,931
Non-agency mortgage-backed securities	1,054,446		7,686		(6,493		)	1,055,639
Asset-backed securities	2,389,176		3,338		(11,213		)	2,381,301
Total mortgage and asset-backed securities	6,118,586		42,634		(38,349		)	6,122,871
Other debt securities	327,030		935		(2,012		)	325,953
Equity securities	5,678		45,585		—			51,263
Total	$	9,600,330	$	109,815	$	(60,942	)	$	9,649,203

The Company’s impairment policy requires a review of all securities for which fair value is less than amortized cost. Special emphasis and analysis is placed on securities whose credit rating has fallen below Baa3 (Moody's) or BBB- (Standard & Poor's), whose fair values have fallen more than 20% below purchase price for an extended period of time, or have been identified based on management’s judgment. These securities are placed on a watch list, and for all such securities, detailed cash flow models are prepared which use inputs specific to each security. Inputs to these models include factors such as cash flow received, contractual payments required, and various other information related to the underlying collateral (including current delinquencies), collateral loss severity rates (including loan to values), expected delinquency rates, credit support from other tranches, and prepayment speeds. Stress tests are performed at varying levels of delinquency rates, prepayment speeds and loss severities in order to gauge probable ranges of credit loss. At December 31, 2017, the fair value of securities on this watch list was $68.0 million compared to $79.6 million at December 31, 2016.

As of December 31, 2017, the Company had recorded OTTI on certain non-agency mortgage-backed securities, part of the watch list mentioned above, which had an aggregate fair value of $26.2 million. The cumulative credit-related portion of the impairment on these securities, which was recorded in earnings, totaled $14.2 million. The Company does not intend to sell these securities and believes it is not likely that it will be required to sell the securities before the recovery of their amortized cost.

The credit-related portion of the loss on these securities was based on the cash flows projected to be received over the estimated life of the securities, discounted to present value, and compared to the current amortized cost bases of the securities. Significant inputs to the cash flow models used to calculate the credit losses on these securities included the following:

Significant Inputs	Range
Prepayment CPR	0%	-	25%
Projected cumulative default	14%	-	50%
Credit support	0%	-	54%
Loss severity	15%	-	63%

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The following table presents a rollforward of the cumulative OTTI credit losses recognized in earnings on all available for sale debt securities.

(In thousands)	2017			2016			2015
Cumulative OTTI credit losses at January 1	$	14,080		$	14,129		$	13,734
Credit losses on debt securities for which impairment was not previously recognized	111			—			76
Credit losses on debt securities for which impairment was previously recognized	274			270			407
Increase in expected cash flows that are recognized over remaining life of security	(266		)	(319		)	(88		)
Cumulative OTTI credit losses at December 31	$	14,199		$	14,080		$	14,129

Securities with unrealized losses recorded in accumulated other comprehensive income are shown in the table below, along with the length of the impairment period.

	Less than 12 months				12 months or longer				Total
(In thousands)	Fair Value		Unrealized Losses		Fair Value		Unrealized Losses		Fair Value		Unrealized Losses
December 31, 2017
U.S. government and federal agency obligations	$	618,617	$	4,443	$	—	$	—	$	618,617	$	4,443
Government-sponsored enterprise obligations	286,393		1,712		49,766		217		336,159		1,929
State and municipal obligations	282,843		1,752		49,339		1,002		332,182		2,754
Mortgage and asset-backed securities:
Agency mortgage-backed securities	1,320,689		9,433		619,300		14,311		1,939,989		23,744
Non-agency mortgage-backed securities	577,017		2,966		153,813		1,871		730,830		4,837
Asset-backed securities	786,048		3,168		264,295		2,069		1,050,343		5,237
Total mortgage and asset-backed securities	2,683,754		15,567		1,037,408		18,251		3,721,162		33,818
Other debt securities	144,090		727		20,202		451		164,292		1,178
Total	$	4,015,697	$	24,201	$	1,156,715	$	19,921	$	5,172,412	$	44,122
December 31, 2016
U.S. government and federal agency obligations	$	349,538	$	2,823	$	32,208	$	3,489	$	381,746	$	6,312
Government-sponsored enterprise obligations	190,441		1,576		—		—		190,441		1,576
State and municipal obligations	700,779		12,164		15,195		529		715,974		12,693
Mortgage and asset-backed securities:
Agency mortgage-backed securities	1,147,416		20,638		2,150		5		1,149,566		20,643
Non-agency mortgage-backed securities	688,131		6,373		34,946		120		723,077		6,493
Asset-backed securities	780,209		5,277		358,778		5,936		1,138,987		11,213
Total mortgage and asset-backed securities	2,615,756		32,288		395,874		6,061		3,011,630		38,349
Other debt securities	179,639		1,986		975		26		180,614		2,012
Total	$	4,036,153	$	50,837	$	444,252	$	10,105	$	4,480,405	$	60,942

The total available for sale portfolio consisted of approximately 2,000 individual securities at December 31, 2017. The portfolio included 635 securities, having an aggregate fair value of $5.2 billion, that were in a loss position at December 31, 2017, compared to 771 securities, with a fair value of $4.5 billion, at December 31, 2016. The total amount of unrealized loss on these securities was $44.1 million at December 31, 2017, a decrease of $16.8 million compared to the loss at December 31, 2016. At December 31, 2017, the fair value of securities in an unrealized loss position for 12 months or longer totaled $1.2 billion, or 13.2% of the total portfolio value.

The Company’s holdings of state and municipal obligations included gross unrealized losses of $2.8 million at December 31, 2017. The state and municipal portfolio totaled $1.6 billion at fair value, or 18.4% of total available for sale securities. The portfolio is diversified in order to reduce risk, and the Company has processes and procedures in place to monitor its state and municipal holdings, identify signs of financial distress and, if necessary, exit its positions in a timely manner.

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The credit ratings (Moody’s rating or equivalent) at December 31, 2017 in the state and municipal bond portfolio are shown in the following table. The average credit quality of the portfolio is Aa2 as rated by Moody’s.

	% of Portfolio
Aaa	6.0	%
Aa	76.9
A	16.4
Not rated	.7
	100.0	%

The following table presents proceeds from sales of securities and the components of investment securities gains and losses which have been recognized in earnings.

(In thousands)	2017			2016			2015
Proceeds from sales of available for sale securities	$	790,152		$	2,049		$	675,870
Proceeds from sales of non-marketable securities	2,228			22,331			13,161
Total proceeds	$	792,380		$	24,380		$	689,031
Available for sale:
Gains realized on sales	$	10,656		$	109		$	2,925
Losses realized on sales	(10,297		)	—			—
Losses realized on called bonds	(254		)	—			—
Gain realized on donation	31,074			—			—
Other-than-temporary impairment recognized on debt securities	(385		)	(270		)	(483		)
Non-marketable:
Gains realized on sales	970			4,349			2,516
Losses realized on sales	(880		)	(502		)	(40		)
Fair value adjustments, net	(5,833		)	(3,739		)	1,402
Investment securities gains (losses), net	$	25,051		$	(53	)	$	6,320

Investment securities with a fair value of $3.8 billion and $4.4 billion were pledged at December 31, 2017 and 2016, respectively, to secure public deposits, securities sold under repurchase agreements, trust funds, and borrowings at the Federal Reserve Bank. Securities pledged under agreements pursuant to which the collateral may be sold or re-pledged by the secured parties approximated $662.5 million, while the remaining securities were pledged under agreements pursuant to which the secured parties may not sell or re-pledge the collateral. Except for obligations of various government-sponsored enterprises such as FNMA, FHLB and FHLMC, no investment in a single issuer exceeds 10% of stockholders’ equity.

4. Land, Buildings and Equipment

Land, buildings and equipment consist of the following at December 31, 2017 and 2016:

(In thousands)	2017		2016
Land	$	94,992	$	98,221
Buildings and improvements	540,204		530,489
Equipment	216,876		258,030
Total	852,072		886,740
Less accumulated depreciation	516,962		549,035
Net land, buildings and equipment	$	335,110	$	337,705

Depreciation expense of $29.1 million in 2017 and $30.1 million in both 2016 and 2015, was included in occupancy expense and equipment expense in the consolidated statements of income. Repairs and maintenance expense of $16.4 million, $16.2 million and $16.3 million for 2017, 2016 and 2015, respectively, was included in occupancy expense and equipment expense. There has been no interest expense capitalized on construction projects in the past three years.

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5. Goodwill and Other Intangible Assets

The following table presents information about the Company's intangible assets which have estimable useful lives.

	December 31, 2017										December 31, 2016
(In thousands)	Gross Carrying Amount		Accumulated Amortization			Valuation Allowance			Net Amount		Gross Carrying Amount		Accumulated Amortization			Valuation Allowance			Net Amount
Amortizable intangible assets:
Core deposit premium	$	31,270	$	(28,305	)	$	—		$	2,965	$	31,270	$	(27,429	)	$	—		$	3,841
Mortgage servicing rights	7,906		(3,244		)	(9		)	4,653		5,672		(2,782		)	(22		)	2,868
Total	$	39,176	$	(31,549	)	$	(9	)	$	7,618	$	36,942	$	(30,211	)	$	(22	)	$	6,709

The carrying amount of goodwill and its allocation among segments at December 31, 2017 and 2016 is shown in the table below. As a result of ongoing assessments, no impairment of goodwill was recorded in 2017, 2016 or 2015. Further, the annual assessment of qualitative factors on January 1, 2018 revealed no likelihood of impairment as of that date.

(In thousands)	December 31, 2017		December 31, 2016
Consumer segment	$	70,721	$	70,721
Commercial segment	67,454		67,454
Wealth segment	746		746
Total goodwill	$	138,921	$	138,921

Changes in the net carrying amount of goodwill and other net intangible assets for the years ended December 31, 2017 and 2016 are shown in the following table.

(In thousands)	Goodwill		Core Deposit Premium			Mortgage Servicing Rights
Balance at December 31, 2015	$	138,921	$	5,031		$	1,638
Originations	—		—			1,539
Amortization	—		(1,190		)	(316		)
Impairment reversal	—		—			7
Balance at December 31, 2016	138,921		3,841			2,868
Originations	—		—			2,234
Amortization	—		(876		)	(462		)
Impairment reversal	—		—			13
Balance at December 31, 2017	$	138,921	$	2,965		$	4,653

Mortgage servicing rights (MSRs) are initially recorded at fair value and subsequently amortized over the period of estimated servicing income. They are periodically reviewed for impairment and if impairment is indicated, recorded at fair value. At December 31, 2017, temporary impairment of $9 thousand had been recognized. Temporary impairment, including impairment recovery, is effected through a change in a valuation allowance. The fair value of the MSRs is based on the present value of expected future cash flows, as further discussed in Note 15 on Fair Value Measurements.

Aggregate amortization expense on intangible assets for the years ended December 31, 2017, 2016 and 2015 was $1.3 million, $1.5 million and $1.8 million, respectively. The following table shows the estimated future amortization expense based on existing asset balances and the interest rate environment as of December 31, 2017. The Company’s actual amortization expense in any given period may be different from the estimated amounts depending upon the acquisition of intangible assets, changes in mortgage interest rates, prepayment rates and other market conditions.

(In thousands)
2018	$	1,213
2019	1,038
2020	878
2021	753
2022	653

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6. Deposits

At December 31, 2017, the scheduled maturities of total time open and certificates of deposit were as follows:

(In thousands)
Due in 2018	$	1,414,554
Due in 2019	217,562
Due in 2020	73,192
Due in 2021	41,313
Due in 2022	18,191
Thereafter	2,052
Total	$	1,766,864

The following table shows a detailed breakdown of the maturities of time open and certificates of deposit, by size category, at December 31, 2017.

(In thousands)	Certificates of Deposit under $100,000		Other Time Deposits under $100,000		Certificates of Deposit over $100,000		Other Time Deposits over $100,000		Total
Due in 3 months or less	$	115,126	$	24,019	$	484,168	$	3,744	$	627,057
Due in over 3 through 6 months	115,595		26,607		197,173		5,438		344,813
Due in over 6 through 12 months	180,447		36,573		216,459		9,205		442,684
Due in over 12 months	82,789		53,490		205,085		10,946		352,310
Total	$	493,957	$	140,689	$	1,102,885	$	29,333	$	1,766,864

The aggregate amount of time open and certificates of deposit that exceeded the $250,000 FDIC insurance limit totaled $880.9 million at December 31, 2017.

7. Borrowings

The following table sets forth selected information for short-term borrowings (borrowings with an original maturity of less than one year).

(Dollars in thousands)	Year End Weighted Rate		Average Weighted Rate		Average Balance Outstanding		Maximum Outstanding at any Month End		Balance at December 31
Federal funds purchased and repurchase agreements:
2017	.8	%	.7	%	$	1,462,387	$	1,984,071	$	1,507,138
2016	.4		.3		1,266,093		1,723,905		1,723,905
2015	.2		.1		1,654,860		2,193,197		1,963,552

Short-term borrowings consist primarily of federal funds purchased and securities sold under agreements to repurchase (repurchase agreements), which generally have one day maturities. At December 31, 2017, $1.3 billion of these borrowings were short-term repurchase agreements comprised of non-insured customer funds, which were secured by a portion of the Company's investment portfolio. Additional information about the securities pledged for repurchase agreements is provided in Note 18 on Resale and Repurchase Agreements.

The Bank is a member of the Des Moines FHLB and has access to term financing from the FHLB. These borrowings are secured under a blanket collateral agreement including primarily residential mortgages as well as all unencumbered assets and stock of the borrowing bank. In November 2017, the Bank repaid its remaining borrowings from the FHLB, which totaled $100.0 million. The FHLB also issues letters of credit to secure the Bank's obligations to certain depositors of public funds, which totaled $498.4 million at December 31, 2017. At December 31, 2017, the Bank had no outstanding advances from the FHLB, and its remaining outstanding debt, totaling $1.8 million, relates to leasing activities.

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8. Income Taxes

The components of income tax expense from operations for the years ended December 31, 2017, 2016 and 2015 were as follows:

(In thousands)	Current		Deferred			Total
Year ended December 31, 2017:
U.S. federal	$	89,154	$	12,190		$	101,344
State and local	7,735		1,427			9,162
Total	$	96,889	$	13,617		$	110,506
Year ended December 31, 2016:
U.S. federal	$	116,753	$	(2,036	)	$	114,717
State and local	9,457		(23		)	9,434
Total	$	126,210	$	(2,059	)	$	124,151
Year ended December 31, 2015:
U.S. federal	$	102,607	$	7,084		$	109,691
State and local	6,551		348			6,899
Total	$	109,158	$	7,432		$	116,590

The components of income tax (benefit) expense recorded directly to stockholders’ equity for the years ended December 31, 2017, 2016 and 2015 were as follows:

(In thousands)	2017			2016			2015
Unrealized gain (loss) on securities available for sale	$	2,104		$	(13,952	)	$	(19,634	)
Accumulated pension (benefit) loss	(184		)	778			1,478
Compensation expense for tax purposes in excess of amounts recognized for financial reporting purposes	—			(3,390		)	(2,132		)
Income tax (benefit) expense allocated to stockholders’ equity	$	1,920		$	(16,564	)	$	(20,288	)

Significant components of the Company’s deferred tax assets and liabilities at December 31, 2017 and 2016 were as follows:

(In thousands)	2017			2016
Deferred tax assets:
Loans, principally due to allowance for loan losses	$	40,341		$	61,233
Equity-based compensation	8,201			12,633
Deferred compensation	5,647			7,998
Private equity investments	5,473			9,667
Accrued expenses	5,245			16,638
Unearned fee income	3,701			3,819
Other	4,430			6,071
Total deferred tax assets	73,038			118,059
Deferred tax liabilities:
Equipment lease financing	45,825			71,355
Unrealized gain on securities available for sale	13,603			18,572
Land, buildings and equipment	8,592			10,375
Undistributed earnings of subsidiaries	7,094			23
Intangibles	5,732			9,105
Other	6,569			8,765
Total deferred tax liabilities	87,415			118,195
Net deferred tax liabilities	$	(14,377	)	$	(136	)

Management believes it is more likely than not that the results of future operations will generate sufficient taxable income to realize the total deferred tax assets.

As a result of the Tax Cuts and Jobs Act enacted on December 22, 2017, the Company revalued its deferred tax assets and liabilities using the highest maximum corporate tax rate of 21%. This change was reported as a reduction of deferred tax expense. The Company also adopted ASU 2016-09, "Improvements to Employee Share-Based Payment Accounting," on January 1, 2017.

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This adoption requires all excess tax benefits and tax deficiencies arising from share-based award payments to be recognized as income tax expense or benefit in the statements of income, while in previous periods these benefits and deficiencies were recognized in equity. In 2017, net excess tax benefits resulted from share-based award payments. The effects on federal tax expense of both of these items are shown in the reconciliation below.

A reconciliation between the expected federal income tax expense using the federal statutory tax rate of 35% and the Company’s actual income tax expense for 2017, 2016 and 2015 is provided in the table below. The effective tax rate is calculated by dividing income taxes by income before income taxes less the non-controlling interest expense.

(In thousands)	2017			2016			2015
Computed “expected” tax expense	$	150,461		$	139,840		$	133,112
Increase (decrease) in income taxes resulting from:
Tax-exempt interest, net of cost to carry	(20,295		)	(20,033		)	(19,083		)
Contribution of appreciated securities	(10,864		)	—			—
Tax reform enactment	(6,753		)	—			—
Share-based award payments	(6,613		)	—			—
State and local income taxes, net of federal tax benefit	5,955			6,132			4,484
Tax deductible dividends on allocated shares held by the Company’s ESOP	(966		)	(1,044		)	(1,093		)
Other	(419		)	(744		)	(830		)
Total income tax expense	$	110,506		$	124,151		$	116,590

The gross amount of unrecognized tax benefits was $1.2 million at both December 31, 2017 and 2016, and the total amount of unrecognized tax benefits that would impact the effective tax rate, if recognized, was $785 thousand and $798 thousand, respectively. The activity in the accrued liability for unrecognized tax benefits for the years ended December 31, 2017 and 2016 was as follows:

(In thousands)	2017			2016
Unrecognized tax benefits at beginning of year	$	1,228		$	1,278
Gross increases – tax positions in prior period	5			—
Gross decreases – tax positions in prior period	—			(1		)
Gross increases – current-period tax positions	268			269
Lapse of statute of limitations	(293		)	(318		)
Unrecognized tax benefits at end of year	$	1,208		$	1,228

The Company and its subsidiaries are subject to income tax by federal, state and local government taxing authorities. Tax years 2014 through 2017 remain open to examination for U.S. federal income tax as well as income tax in major state taxing jurisdictions.

9. Employee Benefit Plans

Employee benefits charged to operating expenses are summarized in the table below. Substantially all of the Company’s employees are covered by a defined contribution (401(k)) plan, under which the Company makes matching contributions.

(In thousands)	2017		2016		2015
Payroll taxes	$	24,402	$	23,210	$	22,235
Medical plans	25,143		25,497		20,659
401(k) plan	14,244		13,562		12,841
Pension plans	704		987		1,495
Other	2,883		3,214		2,950
Total employee benefits	$	67,376	$	66,470	$	60,180

A portion of the Company’s employees are covered by a noncontributory defined benefit pension plan, however, participation in the pension plan is not available to employees hired after June 30, 2003. All participants are fully vested in their benefit payable upon normal retirement date, which is based on years of participation and compensation. Certain key executives also participate in a supplemental executive retirement plan (the CERP) that the Company funds only as retirement benefits are disbursed. The CERP carries no segregated assets. Since January 2011, all benefits accrued under the pension plan have been frozen. However, the accounts continue to accrue interest at a stated annual rate. The CERP continues to provide credits based on hypothetical

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contributions in excess of those permitted under the 401(k) plan. In the tables presented below, the pension plan and the CERP are presented on a combined basis.

Under the Company’s funding policy for the defined benefit pension plan, contributions are made to a trust as necessary to satisfy the statutory minimum required contribution as defined by the Pension Protection Act, which is intended to provide for current service accruals and for any unfunded accrued actuarial liabilities over a reasonable period. To the extent that these requirements are fully covered by assets in the trust, a contribution might not be made in a particular year. No contributions to the defined benefit plan were made in 2016. The Company made a discretionary contribution of $5.5 million to its defined benefit pension plan in 2017 in order to reduce pension guarantee premiums. The minimum required contribution for 2018 is expected to be zero. The Company does not expect to make any further contributions in 2018 other than the necessary funding contributions to the CERP. Contributions to the CERP were $439 thousand, $21 thousand and $20 thousand during 2017, 2016 and 2015, respectively.

The following items are components of the net pension cost for the years ended December 31, 2017, 2016 and 2015.

(In thousands)	2017			2016			2015
Service cost-benefits earned during the year	$	621		$	500		$	503
Interest cost on projected benefit obligation	3,826			3,944			4,762
Expected return on plan assets	(5,785		)	(5,751		)	(6,092		)
Amortization of prior service cost	(271		)	(271		)	(271		)
Amortization of unrecognized net loss	2,313			2,565			2,593
Net periodic pension cost	$	704		$	987		$	1,495

The following table sets forth the pension plans’ funded status, using valuation dates of December 31, 2017 and 2016.

(In thousands)	2017			2016
Change in projected benefit obligation
Projected benefit obligation at prior valuation date	$	116,695		$	117,562
Service cost	621			500
Interest cost	3,826			3,944
Benefits paid	(6,780		)	(6,322		)
Actuarial (gain) loss	6,305			1,011
Projected benefit obligation at valuation date	120,667			116,695
Change in plan assets
Fair value of plan assets at prior valuation date	99,537			99,325
Actual return on plan assets	9,564			6,513
Employer contributions	5,939			21
Benefits paid	(6,780		)	(6,322		)
Fair value of plan assets at valuation date	108,260			99,537
Funded status and net amount recognized at valuation date	$	(12,407	)	$	(17,158	)

The accumulated benefit obligation, which represents the liability of a plan using only benefits as of the measurement date, was $120.7 million and $116.7 million for the combined plans on December 31, 2017 and 2016, respectively.

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Amounts not yet reflected in net periodic benefit cost and included in accumulated other comprehensive income (loss) at December 31, 2017 and 2016 are shown below, including amounts recognized in other comprehensive income during the periods. All amounts are shown on a pre-tax basis.

(In thousands)	2017			2016
Prior service cost	$	1,806		$	2,077
Accumulated loss	(33,499		)	(33,285		)
Accumulated other comprehensive loss	(31,693		)	(31,208		)
Cumulative employer contributions in excess of net periodic benefit cost	19,286			14,050
Net amount recognized as an accrued benefit liability on the December 31 balance sheet	$	(12,407	)	$	(17,158	)
Net loss arising during period	(2,527		)	(248		)
Amortization of net loss	2,313			2,565
Amortization of prior service cost	(271		)	(271		)
Total recognized in other comprehensive income	$	(485	)	$	2,046
Total income (expense) recognized in net periodic pension cost and other comprehensive income	$	(1,189	)	$	1,059

The estimated net loss and prior service cost to be amortized from accumulated other comprehensive income into net periodic pension cost in 2018 is $2.1 million.

The following assumptions, on a weighted average basis, were used in accounting for the plans.

	2017		2016		2015
Determination of benefit obligation at year end:
Effective discount rate for benefit obligations	3.57	%	4.05	%	4.15	%
Assumed credit on cash balance accounts	5.00	%	5.00	%	5.00	%
Determination of net periodic benefit cost for year ended:
Effective discount rate for benefit obligations	3.95	%	4.16	%	3.95	%
Effective rate for interest on benefit obligations	3.28	%	3.38	%	NA
Long-term rate of return on assets	6.00	%	6.00	%	6.00	%
Assumed credit on cash balance accounts	5.00	%	5.00	%	5.00	%

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The following table shows the fair values of the Company’s pension plan assets by asset category at December 31, 2017 and 2016. Information about the valuation techniques and inputs used to measure fair value are provided in Note 15 on Fair Value Measurements.

			Fair Value Measurements
(In thousands)	Total Fair Value		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
December 31, 2017
Assets:
U.S. government obligations	$	3,719	$	3,719	$	—	$	—
Government-sponsored enterprise obligations (a)	1,282		—		1,282		—
State and municipal obligations	8,527		—		8,527		—
Agency mortgage-backed securities (b)	7,896		—		7,896		—
Non-agency mortgage-backed securities	4,891		—		4,891		—
Asset-backed securities	3,833		—		3,833		—
Corporate bonds (c)	37,457		—		37,457		—
Equity securities and mutual funds: (d)
Mutual funds	6,979		6,979		—		—
Common stocks	23,744		23,744		—		—
International developed markets funds	7,870		7,870		—		—
Emerging markets funds	2,062		2,062		—		—
Total	$	108,260	$	44,374	$	63,886	$	—
December 31, 2016
Assets:
U.S. government obligations	$	3,621	$	3,621	$	—	$	—
Government-sponsored enterprise obligations (a)	1,215		—		1,215		—
State and municipal obligations	9,148		—		9,148		—
Agency mortgage-backed securities (b)	4,073		—		4,073		—
Non-agency mortgage-backed securities	5,437		—		5,437		—
Asset-backed securities	5,275		—		5,275		—
Corporate bonds (c)	34,037		—		34,037		—
Equity securities and mutual funds: (d)
Mutual funds	10,393		10,393		—		—
Common stocks	20,141		20,141		—		—
International developed markets funds	5,100		5,100		—		—
Emerging markets funds	1,097		1,097		—		—
Total	$	99,537	$	40,352	$	59,185	$	—

(a) This category represents bonds (excluding mortgage-backed securities) issued by agencies such as the Federal Home Loan Bank, the Federal Home Loan Mortgage Corp and the Federal National Mortgage Association.

(b) This category represents mortgage-backed securities issued by the agencies mentioned in (a).

(c) This category represents investment grade bonds issued in the U.S., primarily by domestic issuers, representing diverse industries.

(d) This category represents investments in individual common stocks and equity funds. These holdings are diversified, largely across the financial services, consumer goods, healthcare, electronic technology and technology services industries.

The investment policy of the pension plan is designed for growth in principal, within limits designed to safeguard against significant losses within the portfolio. The policy sets guidelines, which may change from time to time, regarding the types and percentages of investments held. Currently, the policy includes guidelines such as holding bonds rated investment grade or better and prohibiting investment in Company stock. The plan does not utilize derivatives. Management believes there are no significant concentrations of risk within the plan asset portfolio at December 31, 2017. Under the current policy, the long-term investment target mix for the plan is 35% equity securities and 65% fixed income securities. The Company regularly reviews its policies on investment mix and may make changes depending on economic conditions and perceived investment risk.

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Effective January 1, 2016, the Company changed the method used to estimate the interest cost component of net periodic pension cost for its defined benefit pension plan. Prior to the change, the interest cost component was estimated by utilizing a single weighted average discount rate derived from the yield curve used to measure the projected benefit obligation. Under the new method, the interest cost component is estimated by applying the specific annual spot rates along the yield curve used in the determination of the projected benefit obligation to the relevant projected cash flows. This change provides a more precise measurement of the interest cost by improving the correlation between projected benefit cash flows and the corresponding spot yield curve rates. The Company accounted for this change prospectively as a change in accounting estimate. The change resulted in a decrease of approximately $900 thousand in the interest cost component of the estimated annual net periodic pension cost for 2016.

The assumed overall expected long-term rate of return on pension plan assets used in calculating 2017 pension plan expense was 6.0%. Determination of the plan’s expected rate of return is based upon historical and anticipated returns of the asset classes invested in by the pension plan and the allocation strategy currently in place among those classes. The rate used in plan calculations may be adjusted by management for current trends in the economic environment. The 10-year annualized return for the Company’s pension plan was 6.3%. During 2017, the plan’s rate of return was 9.6%, compared to 7.2% in 2016. Returns for any plan year may be affected by changes in the stock market and interest rates. The Company expects to incur pension expense of $761 thousand in 2018, compared to $704 thousand in 2017.

The Company utilizes mortality tables published by the Society of Actuaries to incorporate mortality assumptions into the measurement of the pension benefit obligation. At December 31, 2017, the Company utilized an updated mortality projection scale and recently finalized mortality tables. In addition, various other assumptions were changed as the result of a recent experience study. The combined effect of all assumption changes decreased the pension benefit obligation on that date by approximately $300 thousand.

The following future benefit payments are expected to be paid:

(In thousands)
2018	$	7,133
2019	7,231
2020	7,413
2021	7,534
2022	7,473
2023 - 2027	37,421

10. Stock-Based Compensation and Directors Stock Purchase Plan*

The Company’s stock-based compensation is provided under a stockholder-approved plan which allows for issuance of various types of awards, including stock options, stock appreciation rights, restricted stock and restricted stock units, performance awards and stock-based awards. During the past three years, stock-based compensation has been issued in the form of nonvested stock awards and stock appreciation rights. At December 31, 2017, 2,776,076 shares remained available for issuance under the plan. The stock-based compensation expense that was charged against income was $12.1 million, $11.5 million and $10.1 million for the years ended December 31, 2017, 2016 and 2015, respectively. The total income tax benefit recognized in the income statement for share-based compensation arrangements was $4.5 million, $4.3 million and $3.8 million for the years ended December 31, 2017, 2016 and 2015, respectively.

The Company adopted ASU 2016-09, "Improvements to Employee Share-Based Payment Accounting," on January 1, 2017. The Company elected to change its method of accounting for forfeitures, as allowed by this guidance. In 2016 and prior years, accruals of compensation cost were reduced by an estimate of awards not expected to vest and further adjusted when actual forfeitures occurred. In 2017 and subsequent years, forfeitures will be accounted for when they occur and recognized in compensation cost at that time. The effect of this change, which was recognized as a cumulative-effect adjustment on January 1, 2017, increased equity and increased deferred tax assets by approximately $1.3 million.

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Nonvested Restricted Stock Awards

Nonvested stock is awarded to key employees by action of the Company's Compensation and Human Resources Committee and Board of Directors. These awards generally vest after 4 to 7 years of continued employment, but vesting terms may vary according to the specifics of the individual grant agreement. There are restrictions as to transferability, sale, pledging, or assigning, among others, prior to the end of the vesting period. Dividend and voting rights are conferred upon grant of restricted stock awards. A summary of the status of the Company’s nonvested share awards as of December 31, 2017 and changes during the year then ended is presented below.

	Shares		Weighted Average Grant Date Fair Value
Nonvested at January 1, 2017	1,461,713		$	33.02
Granted	263,123		54.56
Vested	(442,435	)	29.41
Forfeited	(27,883	)	39.12
Canceled	—		—
Nonvested at December 31, 2017	1,254,518		$	38.67

The total fair value (at vest date) of shares vested during 2017, 2016 and 2015 was $23.8 million, $10.9 million and $6.0 million, respectively.

Stock Appreciation Rights

Stock appreciation rights (SARs) are granted with exercise prices equal to the market price of the Company’s stock at the date of grant. SARs vest ratably over four years of continuous service and have 10-year contractual terms. All SARs must be settled in stock under provisions of the plan. A summary of SAR activity during 2017 is presented below.

(Dollars in thousands, except per share data)	Shares		Weighted Average Exercise Price		Weighted Average Remaining Contractual Term		Aggregate Intrinsic Value
Outstanding at January 1, 2017	1,390,782		$	32.89
Granted	173,740		54.79
Forfeited	(13,325	)	42.19
Expired	(878	)	34.75
Exercised	(371,033	)	29.30
Outstanding at December 31, 2017	1,179,286		$	37.13	6.2	years	$	22,073
Exercisable at December 31, 2017	630,135		$	32.60	4.6	years	$	14,645

In determining compensation cost, the Black-Scholes option-pricing model is used to estimate the fair value of SARs on date of grant. The Black-Scholes model is a closed-end model that uses various assumptions as shown in the following table. Expected volatility is based on historical volatility of the Company’s stock. The Company uses historical exercise behavior and other factors to estimate the expected term of the SARs, which represents the period of time that the SARs granted are expected to be outstanding. The risk-free rate for the expected term is based on the U.S. Treasury zero coupon spot rates in effect at the time of grant. The per share average fair value and the model assumptions for SARs granted during the past three years are shown in the table below.

	2017			2016			2015
Weighted per share average fair value at grant date		$11.94			$6.79			$6.55
Assumptions:
Dividend yield	1.6		%	2.2		%	2.2		%
Volatility	21.1		%	21.2		%	21.3		%
Risk-free interest rate	2.4		%	1.8		%	1.8		%
Expected term	7.0 years			7.2 years			7.2 years

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Additional information about stock options and SARs exercised is presented below.

(In thousands)	2017		2016		2015
Intrinsic value of options and SARs exercised	$	9,310	$	8,854	$	7,541
Cash received from options and SARs exercised	$	—	$	—	$	1,914
Tax benefit realized from options and SARs exercised	$	2,698	$	1,781	$	1,041

As of December 31, 2017, there was $24.0 million of unrecognized compensation cost related to unvested SARs and stock awards. This cost is expected to be recognized over a weighted average period of approximately 3.0 years.

Directors Stock Purchase Plan

The Company has a directors stock purchase plan whereby outside directors of the Company and its subsidiaries may elect to use their directors’ fees to purchase Company stock at market value each month end. Remaining shares available for issuance under this plan were 80,377 at December 31, 2017. In 2017, 15,873 shares were purchased at an average price of $54.55, and in 2016, 21,568 shares were purchased at an average price of $42.50.

* All share and per share amounts in this note have been restated for the 5% common stock dividend distributed in 2017.

11. Accumulated Other Comprehensive Income

The table below shows the activity and accumulated balances for components of other comprehensive income. The largest component is the unrealized holding gains and losses on available for sale securities. Unrealized gains and losses on debt securities for which an other-than-temporary impairment (OTTI) has been recorded in current earnings are shown separately below. The other component is amortization from other comprehensive income of losses associated with pension benefits, which occurs as the amortization is included in current net periodic benefit cost.

	Unrealized Gains (Losses) on Securities (1)						Pension Loss (2)			Total Accumulated Other Comprehensive Income
(In thousands)	OTTI			Other
Balance January 1, 2017	$	2,975		$	27,328		$	(19,328	)		$	10,975
Other comprehensive income (loss) before reclassifications	279			36,307			(2,527		)		34,059
Amounts reclassified from accumulated other comprehensive income	385			(31,433		)	2,042				(29,006		)
Current period other comprehensive income (loss), before tax	664			4,874			(485		)		5,053
Income tax (expense) benefit	(252		)	(1,852		)	184				(1,920		)
Current period other comprehensive income (loss), net of tax	412			3,022			(301		)		3,133
Transfer of unrealized gain on securities for which impairment was not previously recognized	24			(24		)	—				—
Balance December 31, 2017	$	3,411		$	30,326		$	(19,629	)		$	14,108
Balance January 1, 2016	$	3,316		$	49,750		$	(20,596	)		$	32,470
Other comprehensive loss before reclassifications	(820		)	(36,057		)	(248		)		(37,125		)
Amounts reclassified from accumulated other comprehensive income	270			(108		)	2,294				2,456
Current period other comprehensive income (loss), before tax	(550		)	(36,165		)	2,046				(34,669		)
Income tax (expense) benefit	209			13,743			(778		)		13,174
Current period other comprehensive income (loss), net of tax	(341		)	(22,422		)	1,268				(21,495		)
Balance December 31, 2016	$	2,975		$	27,328		$	(19,328	)		$	10,975

(1) The pre-tax amounts reclassified from accumulated other comprehensive income are included in "investment securities gains (losses), net" in the consolidated statements of income.

(2) The pre-tax amounts reclassified from accumulated other comprehensive income are included in the computation of net periodic pension cost as "amortization of prior service cost" and "amortization of unrecognized net loss" (see Note 9), for inclusion in the consolidated statements of income.

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12. Segments

The Company segregates financial information for use in assessing its performance and allocating resources among three operating segments: Consumer, Commercial and Wealth. The Consumer segment includes the consumer portion of the retail branch network (loans, deposits and other personal banking services), indirect and other consumer financing, and consumer debit and credit card loan and fee businesses. Residential mortgage origination, sales and servicing functions are included in this consumer segment, but residential mortgage loans retained by the Company are not considered part of this segment. The Commercial segment provides corporate lending (including the Small Business Banking product line within the branch network), leasing, international services, and business, government deposit, and related commercial cash management services, as well as merchant and commercial bank card products. The Commercial segment also includes the Capital Markets Group, which sells fixed income securities and provides investment safekeeping and bond accounting services. The Wealth segment provides traditional trust and estate planning, advisory and discretionary investment management, and brokerage services. This segment also provides various loan and deposit related services to its private banking customers.

The Company’s business line reporting system derives segment information from the internal profitability reporting system used by management to monitor and manage the financial performance of the Company. This information is based on internal management accounting procedures and methods, which have been developed to reflect the underlying economics of the businesses. These methodologies are applied in connection with funds transfer pricing and assignment of overhead costs among segments. Funds transfer pricing was used in the determination of net interest income by assigning a standard cost (credit) for funds used (provided) by assets and liabilities based on their maturity, prepayment and/or repricing characteristics. Income and expense that directly relate to segment operations are recorded in the segment when incurred. Expenses that indirectly support the segments are allocated based on the most appropriate method available.

The Company uses a funds transfer pricing method to value funds used (e.g., loans, fixed assets, and cash) and funds provided (e.g., deposits, borrowings, and equity) by the business segments and their components. This process assigns a specific value to each new source or use of funds with a maturity, based on current swap rates, thus determining an interest spread at the time of the transaction. Non-maturity assets and liabilities are valued using weighted average pools. The funds transfer pricing process attempts to remove interest rate risk from valuation, allowing management to compare profitability under various rate environments.

The following tables present selected financial information by segment and reconciliations of combined segment totals to consolidated totals. There were no material intersegment revenues between the three segments. Management periodically makes changes to methods of assigning costs and income to its business segments to better reflect operating results. If appropriate, these changes are reflected in prior year information presented below.

Segment Income Statement Data

(In thousands)	Consumer			Commercial			Wealth			Segment Totals			Other/Elimination			Consolidated Totals
Year ended December 31, 2017:
Net interest income	$	279,031		$	328,345		$	47,264		$	654,640		$	79,039		$	733,679
Provision for loan losses	(41,829		)	205			(41		)	(41,665		)	(3,579		)	(45,244		)
Non-interest income	136,554			194,581			158,175			489,310			(2,706		)	486,604
Investment securities gains, net	—			—			—			—			25,051			25,051
Non-interest expense	(290,905		)	(290,874		)	(120,458		)	(702,237		)	(67,447		)	(769,684		)
Income before income taxes	$	82,851		$	232,257		$	84,940		$	400,048		$	30,358		$	430,406
Year ended December 31, 2016:
Net interest income	$	268,654		$	311,704		$	44,113		$	624,471		$	55,578		$	680,049
Provision for loan losses	(36,042		)	4,378			(122		)	(31,786		)	(4,532		)	(36,318		)
Non-interest income	131,988			199,384			144,661			476,033			(1,641		)	474,392
Investment securities losses, net	—			—			—			—			(53		)	(53		)
Non-interest expense	(282,061		)	(284,432		)	(113,888		)	(680,381		)	(36,684		)	(717,065		)
Income before income taxes	$	82,539		$	231,034		$	74,764		$	388,337		$	12,668		$	401,005
Year ended December 31, 2015:
Net interest income	$	266,328		$	296,510		$	42,653		$	605,491		$	28,829		$	634,320
Provision for loan losses	(34,864		)	1,032			75			(33,757		)	5,030			(28,727		)
Non-interest income	119,561			194,133			136,374			450,068			(1,929		)	448,139
Investment securities gains, net	—			—			—			—			6,320			6,320
Non-interest expense	(273,378		)	(267,343		)	(108,755		)	(649,476		)	(27,011		)	(676,487		)
Income before income taxes	$	77,647		$	224,332		$	70,347		$	372,326		$	11,239		$	383,565

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The segment activity, as shown above, includes both direct and allocated items. Amounts in the “Other/Elimination” column include activity not related to the segments, such as that relating to administrative functions, the investment securities portfolio, and the effect of certain expense allocations to the segments. The provision for loan losses in this category contains the difference between net loan charge-offs assigned directly to the segments and the recorded provision for loan loss expense. Included in this category’s net interest income are earnings of the investment portfolio, which are not allocated to a segment.

Segment Balance Sheet Data

(In thousands)	Consumer		Commercial		Wealth		Segment Totals		Other/Elimination		Consolidated Totals
Average balances for 2017:
Assets	$	2,610,045	$	8,830,584	$	1,218,598	$	12,659,227	$	12,372,381	$	25,031,608
Loans, including held for sale	2,471,578		8,635,035		1,209,792		12,316,405		1,312,746		13,629,151
Goodwill and other intangible assets	76,734		68,538		746		146,018		—		146,018
Deposits	10,190,613		8,301,004		2,090,582		20,582,199		12,587		20,594,786
Average balances for 2016:
Assets	$	2,673,915	$	8,267,963	$	1,116,969	$	12,058,847	$	12,497,624	$	24,556,471
Loans, including held for sale	2,533,528		8,072,528		1,108,211		11,714,267		1,239,221		12,953,488
Goodwill and other intangible assets	75,971		68,848		746		145,565		—		145,565
Deposits	9,956,327		8,243,394		2,084,940		20,284,661		46,252		20,330,913

The above segment balances include only those items directly associated with the segment. The “Other/Elimination” column includes unallocated bank balances not associated with a segment (such as investment securities and federal funds sold), balances relating to certain other administrative and corporate functions, and eliminations between segment and non-segment balances. This column also includes the resulting effect of allocating such items as float, deposit reserve and capital for the purpose of computing the cost or credit for funds used/provided.

The Company’s reportable segments are strategic lines of business that offer different products and services. They are managed separately because each line services a specific customer need, requiring different performance measurement analyses and marketing strategies. The performance measurement of the segments is based on the management structure of the Company and is not necessarily comparable with similar information for any other financial institution. The information is also not necessarily indicative of the segments’ financial condition and results of operations if they were independent entities.

13. Common and Preferred Stock*

On December 18, 2017, the Company distributed a 5% stock dividend on its $5 par common stock for the 24th consecutive year. All per common share data in this report has been restated to reflect the stock dividend.

The Company applies the two-class method of computing income per share, as nonvested share-based awards that pay nonforfeitable common stock dividends are considered securities which participate in undistributed earnings with common stock. The two-class method requires the calculation of separate income per share amounts for the nonvested share-based awards and for common stock. Income per share attributable to common stock is shown in the following table. Nonvested share-based awards are further discussed in Note 10 on Stock-Based Compensation.

Basic income per share is based on the weighted average number of common shares outstanding during the year. Diluted income per share gives effect to all dilutive potential common shares that were outstanding during the year. Presented below is a summary of the components used to calculate basic and diluted income per common share, which have been restated for all stock dividends.

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(In thousands, except per share data)	2017		2016		2015
Basic income per common share:
Net income attributable to Commerce Bancshares, Inc.	$	319,383	$	275,391	$	263,730
Less preferred stock dividends	9,000		9,000		9,000
Net income available to common shareholders	310,383		266,391		254,730
Less income allocated to nonvested restricted stock	3,848		3,698		3,548
Net income allocated to common stock	$	306,535	$	262,693	$	251,182
Weighted average common shares outstanding	105,555		105,243		108,016
Basic income per common share	$	2.90	$	2.50	$	2.33
Diluted income per common share:
Net income available to common shareholders	$	310,383	$	266,391	$	254,730
Less income allocated to nonvested restricted stock	3,838		3,692		3,541
Net income allocated to common stock	$	306,545	$	262,699	$	251,189
Weighted average common shares outstanding	105,555		105,243		108,016
Net effect of the assumed exercise of stock-based awards -- based on the treasury stock method using the average market price for the respective periods	372		281		336
Weighted average diluted common shares outstanding	105,927		105,524		108,352
Diluted income per common share	$	2.89	$	2.49	$	2.32

Unexercised stock options and stock appreciation rights of 152 thousand, 99 thousand and 443 thousand were excluded from the computation of diluted income per share for the years ended December 31, 2017, 2016 and 2015, respectively, because their inclusion would have been anti-dilutive.

The Company has 6,000,000 depositary shares outstanding, representing 6,000 shares of 6.00% Series B Non-Cumulative Perpetual Preferred Stock, par value $1.00 per share, having an aggregate liquidation preference of $150.0 million (“Series B Preferred Stock”). Each depositary share has a liquidation preference of $25 per share. Dividends on the Series B Preferred Stock, if declared, accrue and are payable quarterly, in arrears, at a rate of 6.00%. The Series B Preferred Stock qualifies as Tier 1 capital for the purposes of the regulatory capital calculations. In the event that the Company does not declare and pay dividends on the Series B Preferred Stock for the most recent dividend period, the ability of the Company to declare or pay dividends on, purchase, redeem or otherwise acquire shares of its common stock or any securities of the Company that rank junior to the Series B Preferred Stock is subject to certain restrictions under the terms of the Series B Preferred Stock.

The Company entered into accelerated share repurchase programs in 2014 and 2015 for $200.0 million and $100.0 million, respectively. Final settlement of the programs occurred in mid-2015, and a total of 7.9 million shares of common stock were received by the Company under the programs. Shares purchased under these programs were part of the Company's stock repurchase program, as authorized by its Board of Directors. The most recent authorization in October 2015 approved future purchases of 5,000,000 shares of the Company's common stock. At December 31, 2017, 3,443,523 shares of common stock remained available for purchase under the current authorization.

The table below shows activity in the outstanding shares of the Company’s common stock during the past three years. Shares in the table below are presented on an historical basis and have not been restated for the annual 5% stock dividends.

	Years Ended December 31
(In thousands)	2017		2016		2015
Shares outstanding at January 1	101,461		97,226		96,327
Issuance of stock:
Awards and sales under employee and director plans	403		397		435
5% stock dividend	5,078		4,831		4,641
Purchases of treasury stock under accelerated share repurchase programs	—		—		(3,635	)
Other purchases of treasury stock	(315	)	(959	)	(535	)
Other	(12	)	(34	)	(7	)
Shares outstanding at December 31	106,615		101,461		97,226

* Except as noted in the above table, all share and per share amounts in this note have been restated for the 5% common stock dividend distributed in 2017.

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14. Regulatory Capital Requirements

The Company is subject to various regulatory capital requirements administered by the federal banking agencies. Failure to meet minimum capital requirements can initiate certain mandatory and additional discretionary actions by regulators that could have a direct material effect on the Company’s financial statements. The regulations require the Company to meet specific capital adequacy guidelines that involve quantitative measures of the Company’s assets, liabilities and certain off-balance sheet items as calculated under regulatory accounting practices. The Company’s capital classification is also subject to qualitative judgments by the regulators about components, risk weightings and other factors.

The following tables show the capital amounts and ratios for the Company (on a consolidated basis) and the Bank, together with the minimum capital adequacy and well-capitalized capital requirements, at the last two year ends.

	Actual				Minimum Capital Adequacy Requirement				Well-Capitalized Capital Requirement
(Dollars in thousands)	Amount		Ratio		Amount		Ratio		Amount		Ratio
December 31, 2017
Total Capital (to risk-weightedassets):
Commerce Bancshares, Inc. (consolidated)	$	2,747,863	14.35	%	$	1,531,996	8.00	%	N.A.		N.A.
Commerce Bank	2,428,789		12.76		1,522,361		8.00		$	1,902,951	10.00	%
Tier I Capital (to risk-weightedassets):
Commerce Bancshares, Inc. (consolidated)	$	2,567,264	13.41	%	$	1,148,997	6.00	%	N.A.		N.A.
Commerce Bank	2,268,131		11.92		1,141,771		6.00		$	1,522,361	8.00	%
Tier I Common Capital (to risk-weightedassets):
Commerce Bancshares, Inc. (consolidated)	$	2,422,480	12.65	%	$	861,748	4.50	%	N.A.		N.A.
Commerce Bank	2,268,131		11.92		856,328		4.50		$	1,236,918	6.50	%
Tier I Capital (to adjusted quarterly average assets):
(Leverage Ratio)
Commerce Bancshares, Inc. (consolidated)	$	2,567,264	10.39	%	$	988,653	4.00	%	N.A.		N.A.
Commerce Bank	2,268,131		9.20		986,240		4.00		$	1,232,800	5.00	%
December 31, 2016
Total Capital (to risk-weightedassets):
Commerce Bancshares, Inc. (consolidated)	$	2,529,675	13.32	%	$	1,519,578	8.00	%	N.A.		N.A.
Commerce Bank	2,268,845		12.00		1,512,471		8.00		$	1,890,589	10.00	%
Tier I Capital (to risk-weightedassets):
Commerce Bancshares, Inc. (consolidated)	$	2,352,154	12.38	%	$	1,139,684	6.00	%	N.A.		N.A.
Commerce Bank	2,111,797		11.17		1,134,353		6.00		$	1,512,471	8.00	%
Tier I Common Capital (to risk-weightedassets):
Commerce Bancshares, Inc. (consolidated)	$	2,207,370	11.62	%	$	854,763	4.50	%	N.A.		N.A.
Commerce Bank	2,111,797		11.17		850,765		4.50		$	1,228,883	6.50	%
Tier I Capital (to adjusted quarterly average assets):
(Leverage Ratio)
Commerce Bancshares, Inc. (consolidated)	$	2,352,154	9.55	%	$	985,698	4.00	%	N.A.		N.A.
Commerce Bank	2,111,797		8.59		983,081		4.00		$	1,228,851	5.00	%

The minimum required ratios for well-capitalized banks (under prompt corrective action provisions) are 6.5% for Tier I common capital, 8.0% for Tier I capital, 10.0% for Total capital and 5.0% for the leverage ratio.

At December 31, 2017 and 2016, the Company met all capital requirements to which it is subject, and the Bank’s capital position exceeded the regulatory definition of well-capitalized.

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15. Fair Value Measurements

The Company uses fair value measurements to record fair value adjustments to certain financial and nonfinancial assets and liabilities and to determine fair value disclosures. Various financial instruments such as available for sale and trading securities, certain non-marketable securities relating to private equity activities, and derivatives are recorded at fair value on a recurring basis. Additionally, from time to time, the Company may be required to record at fair value other assets and liabilities on a nonrecurring basis, such as loans held for sale, mortgage servicing rights and certain other investment securities. These nonrecurring fair value adjustments typically involve lower of cost or fair value accounting, or write-downs of individual assets.

Fair value is the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. Depending on the nature of the asset or liability, the Company uses various valuation techniques and assumptions when estimating fair value. For accounting disclosure purposes, a three-level valuation hierarchy of fair value measurements has been established. The valuation hierarchy is based upon the transparency of inputs to the valuation of an asset or liability as of the measurement date. The three levels are defined as follows:

• Level 1 – inputs to the valuation methodology are quoted prices for identical assets or liabilities in active markets.

• Level 2 – inputs to the valuation methodology include quoted prices for similar assets and liabilities in active markets, quoted prices for identical or similar assets and liabilities in markets that are not active, and inputs that are observable for the assets or liabilities, either directly or indirectly (such as interest rates, yield curves, and prepayment speeds).

• Level 3 – inputs to the valuation methodology are unobservable and significant to the fair value. These may be internally developed, using the Company’s best information and assumptions that a market participant would consider.

When determining the fair value measurements for assets and liabilities required or permitted to be recorded or disclosed at fair value, the Company considers the principal or most advantageous market in which it would transact and considers assumptions that market participants would use when pricing the asset or liability. When possible, the Company looks to active and observable markets to price identical assets or liabilities. When identical assets and liabilities are not traded in active markets, the Company looks to observable market data for similar assets and liabilities. Nevertheless, certain assets and liabilities are not actively traded in observable markets, and the Company must use alternative valuation techniques to derive an estimated fair value measurement.

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Instruments Measured at Fair Value on a Recurring Basis

The table below presents the carrying values of assets and liabilities measured at fair value on a recurring basis at December 31, 2017 and 2016. There were no transfers among levels during these years.

			Fair Value Measurements Using
(In thousands)	Total Fair Value		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs  (Level 3)
December 31, 2017
Assets:
Residential mortgage loans held for sale	$	15,327	$	—	$	15,327	$	—
Available for sale securities:
U.S. government and federal agency obligations	917,147		917,147		—		—
Government-sponsored enterprise obligations	406,363		—		406,363		—
State and municipal obligations	1,611,366		—		1,594,350		17,016
Agency mortgage-backed securities	3,040,913		—		3,040,913		—
Non-agency mortgage-backed securities	905,793		—		905,793		—
Asset-backed securities	1,492,800		—		1,492,800		—
Other debt securities	351,060		—		351,060		—
Equity securities	48,838		19,864		28,974		—
Trading securities	18,269		—		18,269		—
Private equity investments	55,752		—		—		55,752
Derivatives *	8,349		—		7,723		626
Assets held in trust for deferred compensation plan	12,843		12,843		—		—
Total assets	8,884,820		949,854		7,861,572		73,394
Liabilities:
Derivatives *	8,074		—		7,951		123
Liabilities held in trust for deferred compensation plan	12,843		12,843		—		—
Total liabilities	$	20,917	$	12,843	$	7,951	$	123
December 31, 2016
Assets:
Residential mortgage loans held for sale	$	9,263	$	—	$	9,263	$	—
Available for sale securities:
U.S. government and federal agency obligations	920,904		920,904		—		—
Government-sponsored enterprise obligations	449,998		—		449,998		—
State and municipal obligations	1,778,214		—		1,761,532		16,682
Agency mortgage-backed securities	2,685,931		—		2,685,931		—
Non-agency mortgage-backed securities	1,055,639		—		1,055,639		—
Asset-backed securities	2,381,301		—		2,381,301		—
Other debt securities	325,953		—		325,953		—
Equity securities	51,263		24,967		26,296		—
Trading securities	22,225		—		22,225		—
Private equity investments	50,820		—		—		50,820
Derivatives *	13,566		—		13,146		420
Assets held in trust for deferred compensation plan	10,261		10,261		—		—
Total assets	9,755,338		956,132		8,731,284		67,922
Liabilities:
Derivatives *	13,339		—		13,177		162
Liabilities held in trust for deferred compensation plan	10,261		10,261		—		—
Total liabilities	$	23,600	$	10,261	$	13,177	$	162

* The fair value of each class of derivative is shown in Note 17.

.

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Valuation methods for instruments measured at fair value on a recurring basis

Following is a description of the Company’s valuation methodologies used for instruments measured at fair value on a recurring basis:

Residential mortgage loans held for sale

The Company originates fixed rate, first lien residential mortgage loans that are intended for sale in the secondary market. Fair value is based on quoted secondary market prices for loans with similar characteristics, which are adjusted to include the embedded servicing value in the loans. This adjustment represents an unobservable input to the valuation but is not considered significant given the relative insensitivity of the valuation to changes in this input. Accordingly, these loan measurements are classified as Level 2.

Available for sale investment securities

For available for sale securities, changes in fair value, including that portion of other-than-temporary impairment unrelated to credit loss, are recorded in other comprehensive income. As mentioned in Note 3 on Investment Securities, the Company records the credit-related portion of other-than-temporary impairment in current earnings. This portfolio comprises the majority of the assets which the Company records at fair value. Most of the portfolio, which includes government-sponsored enterprise, mortgage-backed and asset-backed securities, are priced utilizing industry-standard models that consider various assumptions, including time value, yield curves, volatility factors, prepayment speeds, default rates, loss severity, current market and contractual prices for the underlying financial instruments, as well as other relevant economic measures. Substantially all of these assumptions are observable in the marketplace, can be derived from observable data, or are supported by observable levels at which transactions are executed in the marketplace. These measurements are classified as Level 2 in the fair value hierarchy. Where quoted prices are available in an active market, the measurements are classified as Level 1. Most of the Level 1 measurements apply to equity securities and U.S. Treasury obligations.

The fair values of Level 1 and 2 securities (excluding equity securities) in the available for sale portfolio are prices provided by a third-party pricing service. The prices provided by the third-party pricing service are based on observable market inputs, as described in the sections below. On a quarterly basis, the Company compares a sample of these prices to other independent sources for the same and similar securities. Variances are analyzed, and, if appropriate, additional research is conducted with the third-party pricing service. Based on this research, the pricing service may affirm or revise its quoted price. No significant adjustments have been made to the prices provided by the pricing service. The pricing service also provides documentation on an ongoing basis that includes reference data, inputs and methodology by asset class, which is reviewed to ensure that security placement within the fair value hierarchy is appropriate.

Valuation methods and inputs, by class of security:

• U.S. government and federal agency obligations

U.S. treasury bills, bonds and notes, including inflation-protected securities, are valued using live data from active market makers and inter-dealer brokers. Valuations for stripped coupon and principal issues are derived from yield curves generated from various dealer contacts and live data sources.

• Government-sponsored enterprise obligations

Government-sponsored enterprise obligations are evaluated using cash flow valuation models. Inputs used are live market data, cash settlements, Treasury market yields, and floating rate indices such as LIBOR, CMT, and Prime.

• State and municipal obligations, excluding auction rate securities

A yield curve is generated and applied to bond sectors, and individual bond valuations are extrapolated. Inputs used to generate the yield curve are bellwether issue levels, established trading spreads between similar issuers or credits, historical trading spreads over widely accepted market benchmarks, new issue scales, and verified bid information. Bid information is verified by corroborating the data against external sources such as broker-dealers, trustees/paying agents, issuers, or non-affiliated bondholders.

• Mortgage and asset-backed securities

Collateralized mortgage obligations and other asset-backed securities are valued at the tranche level. For each tranche valuation, the process generates predicted cash flows for the tranche, applies a market based (or benchmark) yield/spread for each tranche, and incorporates deal collateral performance and tranche level attributes to determine tranche-specific spreads to adjust the benchmark yield. Tranche cash flows are generated from new deal files and prepayment/default assumptions. Tranche spreads are based on tranche characteristics such as average life, type, volatility, ratings, underlying

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collateral and performance, and prevailing market conditions. The appropriate tranche spread is applied to the corresponding benchmark, and the resulting value is used to discount the cash flows to generate an evaluated price.

Valuation of agency pass-through securities, typically issued under GNMA, FNMA, FHLMC, and SBA programs, are primarily derived from information from the To Be Announced (TBA) market. This market consists of generic mortgage pools which have not been received for settlement. Snapshots of the TBA market, using live data feeds distributed by multiple electronic platforms, are used in conjunction with other indices to compute a price based on discounted cash flow models.

• Other debt securities

Other debt securities are valued using active markets and inter-dealer brokers as well as bullet spread scales and option adjusted spreads. The spreads and models use yield curves, terms and conditions of the bonds, and any special features (e.g., call or put options and redemption features).

• Equity securities

Equity securities are priced using the market prices for each security from the major stock exchanges or other electronic quotation systems. These are generally classified as Level 1 measurements. Stocks which trade infrequently are classified as Level 2.

The available for sale portfolio includes certain auction rate securities. The auction process by which the auction rate securities are normally priced has not functioned in recent years, and due to the illiquidity in the market, the fair value of these securities cannot be based on observable market prices. The fair values of these securities are estimated using a discounted cash flows analysis which is discussed more fully in the Level 3 Inputs section of this note. Because many of the inputs significant to the measurement are not observable, these measurements are classified as Level 3 measurements.

Trading securities

The securities in the Company’s trading portfolio are priced by averaging several broker quotes for similar instruments and are classified as Level 2 measurements.

Private equity investments

These securities are held by the Company’s private equity subsidiaries and are included in non-marketable investment securities in the consolidated balance sheets. Due to the absence of quoted market prices, valuation of these nonpublic investments requires significant management judgment. These fair value measurements, which are discussed in the Level 3 Inputs section of this note, are classified as Level 3.

Derivatives

The Company’s derivative instruments include interest rate swaps, foreign exchange forward contracts, and certain credit risk guarantee agreements. When appropriate, the impact of credit standing as well as any potential credit enhancements, such as collateral, has been considered in the fair value measurement.

• Valuations for interest rate swaps are derived from a proprietary model whose significant inputs are readily observable market parameters, primarily yield curves used to calculate current exposure. Counterparty credit risk is incorporated into the model and calculated by applying a net credit spread over LIBOR to the swap's total expected exposure over time. The net credit spread is comprised of spreads for both the Company and its counterparty, derived from probability of default and other loss estimate information obtained from a third party credit data provider or from the Company's Credit Department when not otherwise available. The credit risk component is not significant compared to the overall fair value of the swaps. The results of the model are constantly validated through comparison to active trading in the marketplace.

Parties to swaps requiring central clearing are required to post collateral (generally in the form of cash or marketable securities) to an authorized clearing agency that holds and monitors the collateral. In January 2017, the Company's clearing counterparty made rule changes to characterize a component of this collateral as a legal settlement of the derivative contract exposure. As a result, this component, known as variation margin, is no longer accounted for separately from the derivative as collateral, but is considered in determining the fair value of the derivative.

The fair value measurements of interest rate swaps are classified as Level 2.

• Fair value measurements for foreign exchange contracts are derived from a model whose primary inputs are quotations from global market makers and are classified as Level 2.

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• The Company’s contracts related to credit risk guarantees are valued under a proprietary model which uses unobservable inputs and assumptions about the creditworthiness of the counterparty (generally a Bank customer). Customer credit spreads, which are based on probability of default and other loss estimates, are calculated internally by the Company's Credit Department, as mentioned above, and are based on the Company's internal risk rating for each customer. Because these inputs are significant to the measurements, they are classified as Level 3.

• Derivatives relating to residential mortgage loan sale activity include commitments to originate mortgage loans held for sale, forward loan sale contracts, and forward commitments to sell TBA securities. The fair values of loan commitments and sale contracts are estimated using quoted market prices for loans similar to the underlying loans in these instruments. The valuations of loan commitments are further adjusted to include embedded servicing value and the probability of funding. These assumptions are considered Level 3 inputs and are significant to the loan commitment valuation; accordingly, the measurement of loan commitments is classified as Level 3. The fair value measurement of TBA contracts is based on security prices published on trading platforms and is classified as Level 2.

Assets held in trust

Assets held in an outside trust for the Company’s deferred compensation plan consist of investments in mutual funds. The fair value measurements are based on quoted prices in active markets and classified as Level 1. The Company has recorded an asset representing the total investment amount. The Company has also recorded a corresponding liability, representing the Company’s liability to the plan participants.

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The changes in Level 3 assets and liabilities measured at fair value on a recurring basis are summarized as follows:

	Fair Value Measurements Using Significant Unobservable Inputs (Level 3)
(In thousands)	State and Municipal Obligations			Private Equity Investments			Derivatives			Total
Year ended December 31, 2017:
Balance at January 1, 2017	$	16,682		$	50,820		$	258		$	67,760
Total gains or losses (realized/unrealized):
Included in earnings	—			(5,833		)	266			(5,567		)
Included in other comprehensive income	882			—			—			882
Investment securities called	(600		)	—			—			(600		)
Discount accretion	52			—			—			52
Purchases of private equity securities	—			13,352			—			13,352
Sale / pay down of private equity securities	—			(2,621		)	—			(2,621		)
Capitalized interest/dividends	—			34			—			34
Purchase of risk participation agreement	—			—			70			70
Sale of risk participation agreement	—			—			(91		)	(91		)
Balance at December 31, 2017	$	17,016		$	55,752		$	503		$	73,271
Total gains or losses for the year included in earnings attributable to the change in unrealized gains or losses relating to assets still held at December 31, 2017	$	—		$	(5,658	)	$	615		$	(5,043	)
Year ended December 31, 2016:
Balance at January 1, 2016	$	17,195		$	63,032		$	69		$	80,296
Total gains or losses (realized/unrealized):
Included in earnings	—			(3,739		)	43			(3,696		)
Included in other comprehensive income	583			—			—			583
Investment securities called	(1,200		)	—			—			(1,200		)
Discount accretion	104			—			—			104
Purchases of private equity securities	—			9,906			—			9,906
Sale / pay down of private equity securities	—			(18,471		)	—			(18,471		)
Capitalized interest/dividends	—			92			—			92
Purchase of risk participation agreement	—			—			404			404
Sale of risk participation agreement	—			—			(258		)	(258		)
Balance at December 31, 2016	$	16,682		$	50,820		$	258		$	67,760
Total gains or losses for the year included in earnings attributable to the change in unrealized gains or losses relating to assets still held at December 31, 2016	$	—		$	(5,914	)	$	306		$	(5,608	)

Gains and losses on the Level 3 assets and liabilities in the table above are reported in the following income categories:

(In thousands)	Loan Fees and Sales		Other Non-Interest Income			Investment Securities Gains (Losses), Net			Total
Year ended December 31, 2017:
Total gains or losses included in earnings	$	231	$	35		$	(5,833	)	$	(5,567	)
Change in unrealized gains or losses relating to assets still held at December 31, 2017	$	580	$	35		$	(5,658	)	$	(5,043	)
Year ended December 31, 2016:
Total gains or losses included in earnings	$	87	$	(44	)	$	(3,739	)	$	(3,696	)
Change in unrealized gains or losses relating to assets still held at December 31, 2016	$	350	$	(44	)	$	(5,914	)	$	(5,608	)

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Level 3 Inputs

As shown above, the Company's significant Level 3 measurements which employ unobservable inputs that are readily quantifiable pertain to auction rate securities (ARS) held by the Bank, investments in portfolio concerns held by the Company's private equity subsidiaries, and held for sale residential mortgage loan commitments. ARS are included in state and municipal securities and totaled $17.0 million at December 31, 2017, while private equity investments, included in non-marketable securities, totaled $55.8 million.

Information about these inputs is presented in the table and discussions below.

Quantitative Information about Level 3 Fair Value Measurements						Weighted
	Valuation Technique	Unobservable Input	Range			Average
Auction rate securities	Discounted cash flow	Estimated market recovery period			5 years
		Estimated market rate	3.1%	-	4.5%
Private equity investments	Market comparable companies	EBITDA multiple	4.0	-	6.0
Mortgage loan commitments	Discounted cash flow	Probability of funding	50.4%	-	100.0%	76.0%
		Embedded servicing value	(.3)%	-	2.0%	1.1%

The fair values of ARS are estimated using a discounted cash flows analysis in which estimated cash flows are based on mandatory interest rates paid under failing auctions and projected over an estimated market recovery period. Under normal conditions, ARS traded in weekly auctions and were considered liquid investments. The Company's estimate of when these auctions might resume is highly judgmental and subject to variation depending on current and projected market conditions. Few auctions of these securities have been successful in recent years, and most secondary transactions have been privately arranged. Estimated cash flows during the period over which the Company expects to hold the securities are discounted at an estimated market rate. These securities are comprised of bonds issued by various states and municipalities for healthcare and student lending purposes, and market rates are derived for each type. Market rates are calculated at each valuation date using a LIBOR or Treasury based rate plus spreads representing adjustments for liquidity premium and nonperformance risk. The spreads are developed internally by employees in the Company's bond department. An increase in the holding period alone would result in a higher fair value measurement, while an increase in the estimated market rate (the discount rate) alone would result in a lower fair value measurement. The valuation of the ARS portfolio is reviewed on a quarterly basis by the Company's chief investment officers.

The fair values of the Company's private equity investments are based on a determination of fair value of the investee company less preference payments assuming the sale of the investee company.  Investee companies are normally non-public entities.  The fair value of the investee company is determined by reference to the investee's total earnings before interest, depreciation/amortization, and income taxes (EBITDA) multiplied by an EBITDA factor.  EBITDA is normally determined based on a trailing prior period adjusted for specific factors including current economic outlook, investee management, and specific unique circumstances such as sales order information, major customer status, regulatory changes, etc.  The EBITDA multiple is based on management's review of published trading multiples for recent private equity transactions and other judgments and is derived for each individual investee.  The fair value of the Company's investment (which is usually a partial interest in the investee company) is then calculated based on its ownership percentage in the investee company. On a quarterly basis, these fair value analyses are reviewed by a valuation committee consisting of investment managers and senior Company management.

The significant unobservable inputs used in the fair value measurement of the Company’s derivative commitments to originate residential mortgage loans are the percentage of commitments that are actually funded and the mortgage servicing value that is inherent in the underlying loan value. A significant increase in the rate of loans that fund would result in a larger derivative asset or liability. A significant increase in the inherent mortgage servicing value would result in an increase in the derivative asset or a reduction in the derivative liability. The probability of funding and the inherent mortgage servicing values are directly impacted by changes in market rates and will generally move in the same direction as interest rates.

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Instruments Measured at Fair Value on a Nonrecurring Basis

For assets measured at fair value on a nonrecurring basis during 2017 and 2016, and still held as of December 31, 2017 and 2016, the following table provides the adjustments to fair value recognized during the respective periods, the level of valuation assumptions used to determine each adjustment, and the carrying value of the related individual assets or portfolios at December 31, 2017 and 2016.

			Fair Value Measurements Using
(In thousands)	Fair Value		Quoted Prices in Active Markets for Identical Assets  (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs  (Level 3)		Total Gains (Losses)
Balance at December 31, 2017
Collateral dependent impaired loans	$	1,236	$	—	$	—	$	1,236	$	(617	)
Mortgage servicing rights	4,653		—		—		4,653		13
Foreclosed assets	—		—		—		—		(9		)
Long-lived assets	3,378		—		—		3,378		(724		)
Balance at December 31, 2016
Collateral dependent impaired loans	$	1,331	$	—	$	—	$	1,331	$	(1,700	)
Mortgage servicing rights	2,868		—		—		2,868		7
Foreclosed assets	18		—		—		18		(20		)
Long-lived assets	2,408		—		—		2,408		(1,054		)

Valuation methods for instruments measured at fair value on a nonrecurring basis

Following is a description of the Company’s valuation methodologies used for other financial and nonfinancial instruments measured at fair value on a nonrecurring basis.

Collateral dependent impaired loans

While the overall loan portfolio is not carried at fair value, the Company periodically records nonrecurring adjustments to the carrying value of loans based on fair value measurements for partial charge-offs of the uncollectible portions of those loans. Nonrecurring adjustments also include certain impairment amounts for collateral dependent loans when establishing the allowance for loan losses. Such amounts are generally based on the fair value of the underlying collateral supporting the loan. In determining the value of real estate collateral, the Company relies on external and internal appraisals of property values depending on the size and complexity of the real estate collateral. The Company maintains a staff of qualified appraisers who also review third party appraisal reports for reasonableness. In the case of non-real estate collateral, reliance is placed on a variety of sources, including external estimates of value and judgments based on the experience and expertise of internal specialists. Values of all loan collateral are regularly reviewed by credit administration. Unobservable inputs to these measurements, which include estimates and judgments often used in conjunction with appraisals, are not readily quantifiable. These measurements are classified as Level 3. Changes in fair value recognized for partial charge-offs of loans and loan impairment reserves on loans held by the Company at December 31, 2017 and 2016 are shown in the table above.

Private equity investments and restricted stock

These assets are included in non-marketable investment securities in the consolidated balance sheets.  They include certain investments in private equity concerns held by the Parent company which are carried at cost, reduced by other-than-temporary impairment. These investments are periodically evaluated for impairment based on their estimated fair value as determined by review of available information, most of which is provided as monthly or quarterly internal financial statements, annual audited financial statements, investee tax returns, and in certain situations, through research into and analysis of the assets and investments held by those private equity concerns.   Restricted stock consists of stock issued by the Federal Reserve Bank and FHLB which is held by the bank subsidiary as required for regulatory purposes.  Generally, there are restrictions on the sale and/or liquidation of these investments, and they are carried at cost, reduced by other-than-temporary impairment.  Fair value measurements for these securities are classified as Level 3.

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Mortgage servicing rights

The Company initially measures its mortgage servicing rights at fair value and amortizes them over the period of estimated net servicing income. They are periodically assessed for impairment based on fair value at the reporting date. Mortgage servicing rights do not trade in an active market with readily observable prices. Accordingly, the fair value is estimated based on a valuation model which calculates the present value of estimated future net servicing income. The model incorporates assumptions that market participants use in estimating future net servicing income, including estimates of prepayment speeds, market discount rates, cost to service, float earnings rates, and other ancillary income, including late fees. The fair value measurements are classified as Level 3.

Foreclosed assets

Foreclosed assets consist of loan collateral which has been repossessed through foreclosure. This collateral is comprised of commercial and residential real estate and other non-real estate property, including auto, marine and recreational vehicles. Foreclosed assets are initially recorded as held for sale at the lower of the loan balance or fair value of the collateral less estimated selling costs. Subsequent to foreclosure, valuations are updated periodically, and the assets may be marked down further, reflecting a new cost basis. Fair value measurements may be based upon appraisals, third-party price opinions, or internally developed pricing methods. These measurements are classified as Level 3.

Long-lived assets

When investments in branch facilities and various office buildings are determined to be impaired, their carrying values are written down to estimated fair value, or estimated fair value less cost to sell if the property is held for sale. Fair value is estimated in a process which considers current local commercial real estate market conditions and the judgment of the sales agent and often involves obtaining third party appraisals from certified real estate appraisers. The carrying amounts of these real estate holdings are regularly monitored by real estate professionals employed by the Company. These fair value measurements are classified as Level 3. Unobservable inputs to these measurements, which include estimates and judgments often used in conjunction with appraisals, are not readily quantifiable.

16. Fair Value of Financial Instruments

The carrying amounts and estimated fair values of financial instruments held by the Company, in addition to a discussion of the methods used and assumptions made in computing those estimates, are set forth below.

Loans

The fair values of loans are estimated by discounting the expected future cash flows using the current rates at which similar loans would be made to borrowers with similar credit ratings and for the same remaining terms. This method of estimating fair value does not incorporate the exit-price concept of fair value prescribed by ASC 820 “Fair Value Measurements and Disclosures”. Future cash flows for each individual loan are modeled using current rates and all contractual features, while adjusting for optionality such as prepayments. Loans with potential optionality are modeled under a multiple-rate path process. Each loan's expected future cash flows are discounted using the LIBOR/swap curve plus an appropriate spread. For business, construction and business real estate loans, internally-developed pricing spreads based on loan type, term and credit score are utilized. The spread for personal real estate loans is generally based on newly originated loans with similar characteristics. For consumer loans, the spread is calculated at loan origination as part of the Bank's funds transfer pricing process, which is indicative of individual borrower creditworthiness. All consumer credit card loans are discounted at the same spread, depending on whether the rate is variable or fixed.

Loans Held for Sale, Investment Securities and Derivative Instruments

Detailed descriptions of the fair value measurements of these instruments are provided in Note 15 on Fair Value Measurements.

Federal Funds Purchased and Sold, Interest Earning Deposits With Banks and Cash and Due From Banks

The carrying amounts of federal funds purchased and sold, interest earning deposits with banks, and cash and due from banks approximates fair value, as these instruments are payable on demand or mature overnight.

Securities Purchased/Sold under Agreements to Resell/Repurchase

The fair values of these investments and borrowings are estimated by discounting contractual cash flows using an estimate of the current market rate for similar instruments.

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Deposits

The fair value of deposits with no stated maturity is equal to the amount payable on demand. Such deposits include savings and interest and non-interest bearing demand deposits. These fair value estimates do not recognize any benefit the Company receives as a result of being able to administer, or control, the pricing of these accounts. Because they are payable on demand, they are classified as Level 1 in the fair value hierarchy. The fair value of time open and certificates of deposit is based on the discounted value of cash flows, taking early withdrawal optionality into account. Discount rates are based on the Company’s approximate cost of obtaining similar maturity funding in the market. Their fair value measurement is classified as Level 3.

Other Borrowings

The fair value of other borrowings, which consists mainly of long-term debt, is estimated by discounting contractual cash flows using an estimate of the current market rate for similar instruments.

The estimated fair values of the Company’s financial instruments are as follows:

	Fair Value Hierarchy Level	2017				2016
(In thousands)		Carrying Amount		Estimated Fair Value		Carrying Amount		Estimated Fair Value
Financial Assets
Loans:
Business	Level 3	$	4,958,554	$	4,971,401	$	4,776,365	$	4,787,469
Real estate - construction and land	Level 3	968,820		979,389		791,236		800,426
Real estate - business	Level 3	2,697,452		2,702,598		2,643,374		2,658,093
Real estate - personal	Level 3	2,062,787		2,060,443		2,010,397		2,005,227
Consumer	Level 3	2,104,487		2,074,129		1,990,801		1,974,784
Revolving home equity	Level 3	400,587		400,333		413,634		414,499
Consumer credit card	Level 3	783,864		798,093		776,465		794,856
Overdrafts	Level 3	7,123		7,123		10,464		10,464
Loans held for sale	Level 2	21,398		21,398		14,456		14,456
Investment securities:
Available for sale	Level 1	937,011		937,011		945,871		945,871
Available for sale	Level 2	7,820,253		7,820,253		8,686,650		8,686,650
Available for sale	Level 3	17,016		17,016		16,682		16,682
Trading	Level 2	18,269		18,269		22,225		22,225
Non-marketable	Level 3	100,758		100,758		99,558		99,558
Federal funds sold	Level 1	42,775		42,775		15,470		15,470
Securities purchased under agreements to resell	Level 3	700,000		695,194		725,000		728,179
Interest earning deposits with banks	Level 1	30,631		30,631		272,275		272,275
Cash and due from banks	Level 1	438,439		438,439		494,690		494,690
Derivative instruments	Level 2	7,723		7,723		13,146		13,146
Derivative instruments	Level 3	626		626		420		420
Assets held in trust for deferred compensation plan	Level 1	12,843		12,843		10,261		10,261
Financial Liabilities
Non-interest bearing deposits	Level 1	$	7,158,962	$	7,158,962	$	7,429,398	$	7,429,398
Savings, interest checking and money market deposits	Level 1	11,499,620		11,499,620		11,430,789		11,430,789
Time open and certificates of deposit	Level 3	1,766,864		1,768,780		2,240,908		2,235,218
Federal funds purchased	Level 1	202,370		202,370		52,840		52,840
Securities sold under agreements to repurchase	Level 3	1,304,768		1,305,375		1,671,065		1,671,227
Other borrowings	Level 3	1,758		1,758		102,049		104,298
Derivative instruments	Level 2	7,951		7,951		13,177		13,177
Derivative instruments	Level 3	123		123		162		162
Liabilities held in trust for deferred compensation plan	Level 1	12,843		12,843		10,261		10,261

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Off-Balance Sheet Financial Instruments

The fair value of letters of credit and commitments to extend credit is based on the fees currently charged to enter into similar agreements. The aggregate of these fees is not material. These instruments are also referenced in Note 19 on Commitments, Contingencies and Guarantees.

Limitations

Fair value estimates are made at a specific point in time based on relevant market information. They do not reflect any premium or discount that could result from offering for sale at one time the Company’s entire holdings of a particular financial instrument. Because no market exists for many of the Company’s financial instruments, fair value estimates are based on judgments regarding future expected loss experience, risk characteristics and economic conditions. These estimates are subjective, involve uncertainties and cannot be determined with precision. Changes in assumptions could significantly affect the estimates.

17. Derivative Instruments

The notional amounts of the Company’s derivative instruments are shown in the table below. These contractual amounts, along with other terms of the derivative, are used to determine amounts to be exchanged between counterparties and are not a measure of loss exposure. The Company's derivative instruments are accounted for as free-standing derivatives, and changes in their fair value are recorded in current earnings.

	December 31
(In thousands)	2017		2016
Interest rate swaps	$	1,741,412	$	1,685,099
Interest rate caps	31,776		59,379
Credit risk participation agreements	133,488		121,514
Foreign exchange contracts	11,826		4,046
Mortgage loan commitments	17,110		12,429
Mortgage loan forward sale contracts	2,566		6,626
Forward TBA contracts	25,000		15,000
Total notional amount	$	1,963,178	$	1,904,093

The largest group of notional amounts relate to interest rate swap contracts sold to commercial customers who wish to modify their interest rate sensitivity. The customers are engaged in a variety of businesses, including real estate, manufacturing, retail product distribution, education, and retirement communities. These customer swaps are offset by matching contracts purchased by the Company from other financial dealer institutions. Contracts with dealers that require central clearing are novated to a clearing agency who becomes the Company's counterparty. Because of the matching terms of the offsetting contracts, in addition to collateral provisions which mitigate the impact of non-performance risk, changes in fair value subsequent to initial recognition have a minimal effect on earnings.

Many of the Company’s interest rate swap arrangements with large financial institutions contain contingent features relating to debt ratings or capitalization levels. Under these provisions, if the Company’s debt rating falls below investment grade or if the Company ceases to be “well-capitalized” under risk-based capital guidelines, certain counterparties can require immediate and ongoing collateralization on interest rate swaps in net liability positions, or can require instant settlement of the contracts. The Company maintains debt ratings and capital well above these minimum requirements.

The Company’s foreign exchange activity involves the purchase and sale of forward foreign exchange contracts, which are commitments to purchase or deliver a specified amount of foreign currency at a specific future date. This activity enables customers involved in international business to hedge their exposure to foreign currency exchange rate fluctuations. The Company minimizes its related exposure arising from these customer transactions with offsetting contracts for the same currency and time frame. Risk arises from changes in the currency exchange rate and from the potential for counterparty nonperformance. These risks are controlled by adherence to a foreign exchange trading policy which contains control limits on currency amounts, open positions, maturities and losses, and procedures for approvals, record-keeping, monitoring and reporting. Hedge accounting has not been applied to these foreign exchange activities.

Credit risk participation agreements arise when the Company contracts, as a guarantor or beneficiary, with other financial institutions to share credit risk associated with certain interest rate swaps. The Company’s risks and responsibilities as guarantor are further discussed in Note 19 on Commitments, Contingencies and Guarantees.    

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Under its program to sell residential mortgage loans in the secondary market, the Company designates certain newly-originated residential mortgage loans as held for sale. Derivative instruments arising from this activity include mortgage loan commitments and forward loan sale contracts. Changes in the fair values of the loan commitments and funded loans prior to sale that are due to changes in interest rates are economically hedged with forward contracts to sell residential mortgage-backed securities in the to-be-announced (TBA) market. These forward TBA contracts are also considered to be derivatives and are settled in cash at the security settlement date.

The fair values of the Company’s derivative instruments are shown in the table below. Information about the valuation methods used to measure fair value is provided in Note 15 on Fair Value Measurements. Derivative instruments with a positive fair value (asset derivatives) are reported in other assets in the consolidated balance sheets while derivative instruments with a negative fair value (liability derivatives) are reported in other liabilities in the consolidated balance sheets. As mentioned in Note 15, effective January 2017, certain collateral posted to and from the Company's clearing counterparty has been offset against the fair values of cleared swaps, such that at December 31, 2017, the positive fair values of cleared swaps were reduced by $4.5 million and the negative fair values of cleared swaps were reduced by $4.3 million, as reflected in the table below.        

	Asset Derivatives				Liability Derivatives
	December 31				December 31
	2017		2016		2017			2016
(In thousands)	Fair Value				Fair Value
Derivative instruments:
Interest rate swaps	$	7,674	$	12,987	$	(7,857	)	$	(12,987	)
Interest rate caps	16		78		(16		)	(78		)
Credit risk participation agreements	46		65		(123		)	(156		)
Foreign exchange contracts	21		66		(40		)	(4		)
Mortgage loan commitments	580		355		—			(6		)
Mortgage loan forward sale contracts	8		—		(7		)	(63		)
Forward TBA contracts	4		15		(31		)	(45		)
Total	$	8,349	$	13,566	$	(8,074	)	$	(13,339	)

The effects of derivative instruments on the consolidated statements of income are shown in the table below.

	Location of Gain or (Loss) Recognized in Income on Derivative	Amount of Gain or (Loss) Recognized in Income on Derivative
		For the Years Ended December 31
(In thousands)		2017			2016			2015
Derivative instruments:
Interest rate swaps	Other non-interest income	$	1,978		$	5,927		$	4,309
Interest rate caps	Other non-interest income	—			—			32
Credit risk participation agreements	Other non-interest income	35			(44		)	57
Foreign exchange contracts:	Other non-interest income	(80		)	55			253
Mortgage loan commitments	Loan fees and sales	231			87			263
Mortgage loan forward sale contracts	Loan fees and sales	64			(63		)	—
Forward TBA contracts	Loan fees and sales	(648		)	79			82
Total		$	1,580		$	6,041		$	4,996

The following table shows the extent to which assets and liabilities relating to derivative instruments have been offset in the consolidated balance sheets. It also provides information about these instruments which are subject to an enforceable master netting arrangement, irrespective of whether they are offset, and the extent to which the instruments could potentially be offset. Also shown is collateral received or pledged in the form of other financial instruments, which is generally cash or marketable securities. The collateral amounts in this table are limited to the outstanding balance of the related asset or liability (after netting is applied); thus amounts of excess collateral are not shown. Most of the derivatives in the following table were transacted under master netting arrangements that contain a conditional right of offset, such as close-out netting, upon default.

The Company is party to master netting arrangements with most of its swap derivative counterparties; however, the Company does not offset derivative assets and liabilities under these arrangements on its consolidated balance sheet. Collateral, usually in

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the form of marketable securities, is exchanged between the Company and dealer bank counterparties and is generally subject to thresholds and transfer minimums. By contract, it may be sold or re-pledged by the secured party until recalled at a subsequent valuation date by the pledging party. For those swap transactions requiring central clearing, the Company posts cash and securities to its clearing agency. Collateral positions are valued daily, and adjustments to amounts received and pledged by the Company are made as appropriate to maintain proper collateralization for these transactions. Swap derivative transactions with customers are generally secured by rights to non-financial collateral, such as real and personal property, which is not shown in the table below.

							Gross Amounts Not Offset in the Balance Sheet
(In thousands)	Gross Amount Recognized		Gross Amounts Offset in the Balance Sheet		Net Amounts Presented in the Balance Sheet		Financial Instruments Available for Offset			Collateral Received/Pledged			Net Amount
December 31, 2017
Assets:
Derivatives subject to master netting agreements	$	7,726	$	—	$	7,726	$	(233	)	$	(824	)	$	6,669
Derivatives not subject to master netting agreements	623		—		623
Total derivatives	8,349		—		8,349
Liabilities:
Derivatives subject to master netting agreements	7,935		—		7,935		(233		)	(1,570		)	6,132
Derivatives not subject to master netting agreements	139		—		139
Total derivatives	8,074		—		8,074
December 31, 2016
Assets:
Derivatives subject to master netting agreements	$	13,111	$	—	$	13,111	$	(3,391	)	$	—		$	9,720
Derivatives not subject to master netting agreements	455		—		455
Total derivatives	13,566		—		13,566
Liabilities:
Derivatives subject to master netting agreements	13,124		—		13,124		(3,391		)	(5,292		)	4,441
Derivatives not subject to master netting agreements	215		—		215
Total derivatives	13,339		—		13,339

18. Resale and Repurchase Agreements

The following table shows the extent to which assets and liabilities relating to securities purchased under agreements to resell (resale agreements) and securities sold under agreements to repurchase (repurchase agreements) have been offset in the consolidated balance sheets, in addition to the extent to which they could potentially be offset. Also shown is collateral received or pledged, which consists of marketable securities. The collateral amounts in the table are limited to the outstanding balances of the related asset or liability (after netting is applied); thus amounts of excess collateral are not shown. The agreements in the following table were transacted under master netting arrangements that contain a conditional right of offset, such as close-out netting, upon default.

Resale and repurchase agreements are agreements to purchase/sell securities subject to an obligation to resell/repurchase the same or similar securities. They are accounted for as collateralized financing transactions, not as sales and purchases of the securities portfolio. The securities collateral accepted or pledged in resale and repurchase agreements with other financial institutions also may be sold or re-pledged by the secured party, but is usually delivered to and held by third party trustees. The Company generally retains custody of securities pledged for repurchase agreements with customers.

The Company is party to several agreements commonly known as collateral swaps. These agreements involve the exchange of collateral under simultaneous repurchase and resale agreements with the same financial institution counterparty. These repurchase

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and resale agreements have the same principal amounts, inception dates, and maturity dates and have been offset against each other in the balance sheet, having met the accounting requirements for this treatment. The collateral swaps totaled $650.0 million at December 31, 2017 and $550.0 million at December 31, 2016. At December 31, 2017, the Company had posted collateral of $661.4 million in marketable securities, consisting of agency mortgage-backed bonds and treasuries, and had accepted $661.3 million in investment grade asset-backed, commercial mortgage-backed, and corporate bonds.

								Gross Amounts Not Offset in the Balance Sheet
(In thousands)	Gross Amount Recognized		Gross Amounts Offset in the Balance Sheet			Net Amounts Presented in the Balance Sheet		Financial Instruments Available for Offset		Securities Collateral Received/Pledged			Net Amount
December 31, 2017
Total resale agreements, subject to master netting arrangements	$	1,350,000	$	(650,000	)	$	700,000	$	—	$	(700,000	)	$	—
Total repurchase agreements, subject to master netting arrangements	1,954,768		(650,000		)	1,304,768		—		(1,304,768		)	—
December 31, 2016
Total resale agreements, subject to master netting arrangements	$	1,275,000	$	(550,000	)	$	725,000	$	—	$	(725,000	)	$	—
Total repurchase agreements, subject to master netting arrangements	2,221,065		(550,000		)	1,671,065		—		(1,671,065		)	—

The table below shows the remaining contractual maturities of repurchase agreements outstanding at December 31, 2017 and 2016, in addition to the various types of marketable securities that have been pledged as collateral for these borrowings.

	Remaining Contractual Maturity of the Agreements
(In thousands)	Overnight and continuous		Up to 90 days		Greater than 90 days		Total
December 31, 2017
Repurchase agreements, secured by:
U.S. government and federal agency obligations	$	271,820	$	1,731	$	450,000	$	723,551
Government-sponsored enterprise obligations	149,111		—		—		149,111
Agency mortgage-backed securities	737,975		9,750		200,000		947,725
Asset-backed securities	89,601		30,000		—		119,601
Other debt securities	14,780		—		—		14,780
Total repurchase agreements, gross amount recognized	$	1,263,287	$	41,481	$	650,000	$	1,954,768
December 31, 2016
Repurchase agreements, secured by:
U.S. government and federal agency obligations	$	294,600	$	—	$	300,000	$	594,600
Government-sponsored enterprise obligations	147,694		—		3,237		150,931
Agency mortgage-backed securities	693,851		24,380		252,473		970,704
Asset-backed securities	474,830		30,000		—		504,830
Total repurchase agreements, gross amount recognized	$	1,610,975	$	54,380	$	555,710	$	2,221,065

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19. Commitments, Contingencies and Guarantees

The Company leases certain premises and equipment, all of which were classified as operating leases. The rent expense under such arrangements amounted to $7.3 million, $7.1 million and $6.8 million in 2017, 2016 and 2015, respectively. A summary of minimum lease commitments follows:

(In thousands)	Type of Property
Year Ended December 31	Real Property		Equipment		Total
2018	$	5,981	$	215	$	6,196
2019	4,876		75		4,951
2020	3,861		32		3,893
2021	3,162		14		3,176
2022	2,678		—		2,678
After	13,383		—		13,383
Total minimum lease payments					$	34,277

All leases expire prior to 2052. It is expected that in the normal course of business, leases that expire will be renewed or replaced by leases on other properties; thus, the future minimum lease commitments are not expected to be less than the amounts shown for 2018.

The Company engages in various transactions and commitments with off-balance sheet risk in the normal course of business to meet customer financing needs. The Company uses the same credit policies in making the commitments and conditional obligations described below as it does for on-balance sheet instruments. The following table summarizes these commitments at December 31:

(In thousands)	2017		2016
Commitments to extend credit:
Credit card	$	5,102,556	$	4,932,955
Other	5,737,181		5,508,686
Standby letters of credit, net of participations	387,811		391,899
Commercial letters of credit	4,498		2,962

Commitments to extend credit are legally binding agreements to lend to a borrower providing there are no violations of any conditions established in the contract. As many of the commitments are expected to expire without being drawn upon, the total commitment does not necessarily represent future cash requirements. Refer to Note 2 on Loans and Allowance for Loan Losses for further discussion.

Commercial letters of credit act as a means of ensuring payment to a seller upon shipment of goods to a buyer. The majority of commercial letters of credit issued are used to settle payments in international trade. Typically, letters of credit require presentation of documents which describe the commercial transaction, evidence shipment, and transfer title.

The Company, as a provider of financial services, routinely issues financial guarantees in the form of financial and performance standby letters of credit. Standby letters of credit are contingent commitments issued by the Company generally to guarantee the payment or performance obligation of a customer to a third party. While these represent a potential outlay by the Company, a significant amount of the commitments may expire without being drawn upon. The Company has recourse against the customer for any amount it is required to pay to a third party under a standby letter of credit. The letters of credit are subject to the same credit policies, underwriting standards and approval process as loans made by the Company. Most of the standby letters of credit are secured, and in the event of nonperformance by the customer, the Company has rights to the underlying collateral, which could include commercial real estate, physical plant and property, inventory, receivables, cash and marketable securities.

At December 31, 2017, the Company had recorded a liability in the amount of $2.5 million, representing the carrying value of the guarantee obligations associated with the standby letters of credit. This amount will be accreted into income over the remaining life of the respective commitments. Commitments outstanding under these letters of credit, which represent the maximum potential future payments guaranteed by the Company, were $387.8 million at December 31, 2017.

The Company regularly purchases various state tax credits arising from third-party property redevelopment. These credits are either resold to third parties or retained for use by the Company. During 2017, purchases and sales of tax credits amounted to

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$70.9 million and $47.1 million, respectively. At December 31, 2017, the Company had outstanding purchase commitments totaling $114.9 million that it expects to fund in 2018.

The Company periodically enters into risk participation agreements (RPAs) as a guarantor to other financial institutions, in order to mitigate those institutions’ credit risk associated with interest rate swaps with third parties. The RPA stipulates that, in the event of default by the third party on the interest rate swap, the Company will reimburse a portion of the loss borne by the financial institution. These interest rate swaps are normally collateralized (generally with real property, inventories and equipment) by the third party, which limits the credit risk associated with the Company’s RPAs. The third parties usually have other borrowing relationships with the Company. The Company monitors overall borrower collateral, and at December 31, 2017, believes sufficient collateral is available to cover potential swap losses. The RPAs are carried at fair value throughout their term, with all changes in fair value, including those due to a change in the third party’s creditworthiness, recorded in current earnings. The terms of the RPAs, which correspond to the terms of the underlying swaps, range from 2 to 11 years. At December 31, 2017, the fair value of the Company's guarantee liability RPAs was $123 thousand, and the notional amount of the underlying swaps was $84.1 million. The maximum potential future payment guaranteed by the Company cannot be readily estimated and is dependent upon the fair value of the interest rate swaps at the time of default.

The Company has various legal proceedings pending at December 31, 2017, arising in the normal course of business. While some matters pending against the Company specify damages claimed by plaintiffs, others do not seek a specified amount of damages or are at very early stages of the legal process. The Company records a loss accrual for all legal and regulatory matters for which it deems a loss is probable and can be reasonably estimated. Some matters, which are in the early stages, have not yet progressed to the point where a loss amount can be determined to be probable and estimable.

20. Related Parties

The Company’s Chief Executive Officer, its Vice Chairman, and its President are directors of Tower Properties Company (Tower) and, together with members of their immediate families, beneficially own approximately 66% of the outstanding stock of Tower. At December 31, 2017, Tower owned 270,646 shares of Company stock. Tower is primarily engaged in the business of owning, developing, leasing and managing real property.

Payments from the Company and its affiliates to Tower are summarized below. These payments, with the exception of dividend payments, relate to property management services, including construction oversight, on three Company-owned office buildings and related parking garages in downtown Kansas City.

(In thousands)	2017		2016		2015
Leasing agent fees	$	32	$	101	$	66
Operation of parking garages	82		184		75
Building management fees	1,954		1,832		1,850
Property construction management fees	146		147		322
Dividends paid on Company stock held by Tower	232		221		210
Total	$	2,446	$	2,485	$	2,523

Tower has a $13.5 million line of credit with the Bank which is subject to normal credit terms and has a variable interest rate. The line of credit is collateralized by Company stock and based on collateral value had a maximum borrowing amount of approximately $11.5 million at December 31, 2017. There were $5.2 million of borrowings under this line during 2017, and there was no balance outstanding at December 31, 2017. There were no borrowings outstanding during 2016, and the maximum borrowings outstanding during 2015 were $1.3 million. There was no balance outstanding at December 31, 2016 or 2015. Interest paid on these borrowings during the last three years was not significant. Letters of credit may be collateralized under this line of credit; however, there were no letters of credit outstanding during 2017, 2016 or 2015, and thus, no fees were received during these periods. From time to time, the Bank extends additional credit to Tower for construction and development projects. No construction loans were outstanding during 2017, 2016 and 2015.

Tower leases office space in the Kansas City bank headquarters building owned by the Company. Rent paid to the Company totaled $74 thousand in 2017, $72 thousand in 2016, and $69 thousand in 2015, at $15.75, $15.67 and $15.42 per square foot, respectively.

Directors of the Company and their beneficial interests have deposit accounts with the Bank and may be provided with cash management and other banking services, including loans, in the ordinary course of business. Such loans were made on substantially the same terms, including interest rates and collateral, as those prevailing at the time for comparable transactions with other unrelated persons and did not involve more than the normal risk of collectability.

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As discussed in Note 19 on Commitments, Contingencies, and Guarantees, the Company regularly purchases various state tax credits arising from third-party property redevelopment and resells the credits to third parties.  During 2017, the Company sold state tax credits to its Chief Executive Officer, its Vice Chairman, and its President, in the amount of $694 thousand, $598 thousand, and $67 thousand, respectively, for personal tax planning. During 2016, the Company sold state tax credits to its Chief Executive Officer, his father (a former Chief Executive Officer), its Vice Chairman, and its President, in the amount of $549 thousand, $191 thousand, $244 thousand, and $72 thousand, respectively. During 2015, the Company sold state tax credits to its Chief Executive Officer, his father, its Vice Chairman, and its President in the amount of $478 thousand, $40 thousand, $372 thousand, and $65 thousand, respectively. The terms of the sales and the amounts paid were the same as the terms and amounts paid for similar tax credits by persons not related to the Company.

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21. Parent Company Condensed Financial Statements

Following are the condensed financial statements of Commerce Bancshares, Inc. (Parent only) for the periods indicated:

Condensed Balance Sheets
	December 31
(In thousands)	2017		2016
Assets
Investment in consolidated subsidiaries:
Bank	$	2,409,098	$	2,246,060
Non-banks	52,479		51,816
Cash	151,607		51
Securities purchased under agreements to resell	—		155,775
Investment securities:
Available for sale	53,285		58,051
Non-marketable	655		718
Note receivable due from bank subsidiary	50,000		—
Advances to subsidiaries, net of borrowings	14,571		5,053
Income tax benefits	8,279		524
Other assets	19,951		17,716
Total assets	$	2,759,925	$	2,535,764
Liabilities and stockholders’ equity
Pension obligation	$	12,407	$	17,158
Other liabilities	30,958		22,823
Total liabilities	43,365		39,981
Stockholders’ equity	2,716,560		2,495,783
Total liabilities and stockholders’ equity	$	2,759,925	$	2,535,764

Condensed Statements of Income
	For the Years Ended December 31
(In thousands)	2017			2016			2015
Income
Dividends received from consolidated bank subsidiary	$	160,002		$	160,002		$	160,001
Earnings of consolidated subsidiaries, net of dividends	147,678			118,704			106,636
Interest and dividends on investment securities	2,099			2,364			2,272
Management fees charged to subsidiaries	30,431			30,965			25,713
Investment securities gains	41,717			1,880			—
Net interest income on advances and note to subsidiaries	514			21			4
Other	3,346			2,720			1,422
Total income	385,787			316,656			296,048
Expense
Salaries and employee benefits	33,714			29,116			22,167
Professional fees	2,036			1,951			1,833
Data processing fees paid to affiliates	3,512			3,226			3,186
Community service	32,093			1,620			991
Other	10,671			9,849			8,278
Total expense	82,026			45,762			36,455
Income tax benefit	(15,622		)	(4,497		)	(4,137		)
Net income	$	319,383		$	275,391		$	263,730

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Condensed Statements of Cash Flows
	For the Years Ended December 31
(In thousands)	2017			2016			2015
Operating Activities
Net income	$	319,383		$	275,391		$	263,730
Adjustments to reconcile net income to net cash provided by operating activities:
Earnings of consolidated subsidiaries, net of dividends	(147,678		)	(118,704		)	(106,636		)
Other adjustments, net	(11,268		)	9,541			(1,152		)
Net cash provided by operating activities	160,437			166,228			155,942
Investing Activities
(Increase) decrease in securities purchased under agreements to resell	155,775			(51,335		)	57,210
(Increase) decrease in investment in subsidiaries, net	11			4			(6		)
Proceeds from sales of investment securities	11,006			2,949			—
Proceeds from maturities/pay downs of investment securities	2,295			4,105			3,516
Purchases of investment securities	—			—			(2,500		)
Note receivable due from bank subsidiary	(50,000		)	—			—
(Increase) decrease in advances to subsidiaries, net	(9,518		)	13,507			1,171
Net purchases of building improvements and equipment	(52		)	(3		)	(113		)
Net cash provided by (used in) investing activities	109,517			(30,773		)	59,278
Financing Activities
Purchases of treasury stock	(17,771		)	(39,381		)	(23,176		)
Accelerated share repurchase agreements	—			—			(100,000		)
Issuance of stock under equity compensation plans	(8		)	(6		)	1,914
Cash dividends paid on common stock	(91,619		)	(87,070		)	(84,961		)
Cash dividends paid on preferred stock	(9,000		)	(9,000		)	(9,000		)
Net cash used in financing activities	(118,398		)	(135,457		)	(215,223		)
Increase (decrease) in cash	151,556			(2		)	(3		)
Cash at beginning of year	51			53			56
Cash at end of year	$	151,607		$	51		$	53
Income tax payments (receipts), net	$	(8,991	)	$	(8,958	)	$	1,278

Dividends paid by the Parent to its shareholders were substantially provided from Bank dividends. The Bank may distribute common dividends without prior regulatory approval, provided that the dividends do not exceed the sum of net income for the current year and retained net income for the preceding two years, subject to maintenance of minimum capital requirements. The Parent charges fees to its subsidiaries for management services provided, which are allocated to the subsidiaries based primarily on total average assets. The Parent makes cash advances to its private equity subsidiaries for general short-term cash flow purposes. Advances may be made to the Parent by its subsidiary bank holding company for temporary investment of idle funds. Interest on such advances is based on market rates.

In 2017, the Bank borrowed $50.0 million from the Parent as part of its strategy to reduce FDIC insurance premiums. The note has a rolling 13 month maturity, and the interest rate is a variable rate equal to the one year treasury rate.

For the past several years, the Parent has maintained a $20.0 million line of credit for general corporate purposes with the Bank. The line of credit is secured by investment securities. The Parent has not borrowed under this line during the past three years.

At December 31, 2017, the fair value of available for sale investment securities held by the Parent consisted of investments of $48.7 million in common and preferred stock and $4.6 million in non-agency mortgage-backed securities. The Parent’s unrealized net gain in fair value on its investments was $44.5 million at December 31, 2017. The corresponding net of tax unrealized gain included in the equity category of accumulated other comprehensive income was $27.6 million. Also included in accumulated

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other comprehensive income was an unrealized net of tax gain in fair value of investment securities held by subsidiaries, which amounted to $6.2 million at December 31, 2017.

During 2017, the Parent contributed appreciated common stock to a charitable foundation and recorded securities gains of $31.1 million and expense of $32.0 million in these transactions. The Parent also sold holdings of the same investment during the fourth quarter of 2017 for a total gain of $10.0 million. The Parent's remaining holdings of this stock, with a fair value of $45.9 million at December 31, 2017, are expected to be redeemed for cash in a third party merger transaction expected to occur in the first six months of 2018. The Company adopted new accounting guidance on January 1, 2018 which reclassified the unrealized gain in fair value on these holdings (net of tax) to retained earnings, as discussed in the Financial Instruments section on page 52.

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Item 9. CHANGES IN AND DISAGREEMENTS WITH ACCOUNTANTS ON ACCOUNTING AND FINANCIAL DISCLOSURE

There were no changes in or disagreements with accountants on accounting and financial disclosure.

Item 9a. CONTROLS AND PROCEDURES

Conclusion Regarding the Effectiveness of Disclosure Controls and Procedures

Under the supervision and with the participation of our management, including our principal executive officer and principal financial officer, we conducted an evaluation of our disclosure controls and procedures, as such term is defined in Rules 13a-15(e) and 15d-15(e) under the Securities Exchange Act of 1934. Based on this evaluation, our principal executive officer and our principal financial officer concluded that our disclosure controls and procedures were effective as of the end of the period covered by this annual report.

Management’s Report on Internal Control Over Financial Reporting

Our management is responsible for establishing and maintaining adequate internal control over financial reporting, as such term is defined in Exchange Act Rules 13a-15(f) and 15d-15(f). Under the supervision and with the participation of our management, including our principal executive officer and principal financial officer, we conducted an evaluation of the effectiveness of our internal control over financial reporting based on the framework in Internal Control — Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission. Based on our evaluation under the framework in Internal Control — Integrated Framework (2013), our management concluded that our internal control over financial reporting was effective as of December 31, 2017.

The Company’s internal control over financial reporting as of December 31, 2017 has been audited by KPMG LLP, an independent registered public accounting firm, as stated in their report which follows.

Changes in Internal Control Over Financial Reporting

 No change in the Company’s internal control over financial reporting occurred that has materially affected, or is reasonably likely to materially affect, such controls during the last quarter of the period covered by this report.

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REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

To the Stockholders and Board of Directors

Commerce Bancshares, Inc.:

Opinion on Internal Control Over Financial Reporting

We have audited Commerce Bancshares, Inc. and subsidiaries’ (the Company) internal control over financial reporting as of December 31, 2017, based on criteria established in Internal Control - Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission. In our opinion, the Company maintained, in all material respects, effective internal control over financial reporting as of December 31, 2017, based on criteria established in Internal Control - Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission.

We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States) (PCAOB), the consolidated balance sheets of the Company as of December 31, 2017 and 2016, the related consolidated statements of income, comprehensive income, cash flows, and changes in equity for each of the years in the three-year period ended December 31, 2017, and the related notes (collectively, the consolidated financial statements), and our report dated February 22, 2018 expressed an unqualified opinion on those consolidated financial statements.

Basis for Opinion

The Company’s management is responsible for maintaining effective internal control over financial reporting and for its assessment of the effectiveness of internal control over financial reporting, included in the accompanying Management’s Report on Internal Control over Financial Reporting. Our responsibility is to express an opinion on the Company’s internal control over financial reporting based on our audit. We are a public accounting firm registered with the PCAOB and are required to be independent with respect to the Company in accordance with the U.S. federal securities laws and the applicable rules and regulations of the Securities and Exchange Commission and the PCAOB.

We conducted our audit in accordance with the standards of the PCAOB. Those standards require that we plan and perform the audit to obtain reasonable assurance about whether effective internal control over financial reporting was maintained in all material respects. Our audit of internal control over financial reporting included obtaining an understanding of internal control over financial reporting, assessing the risk that a material weakness exists, and testing and evaluating the design and operating effectiveness of internal control based on the assessed risk. Our audit also included performing such other procedures as we considered necessary in the circumstances. We believe that our audit provides a reasonable basis for our opinion.

Definition and Limitations of Internal Control Over Financial Reporting

A company’s internal control over financial reporting is a process designed to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles. A company’s internal control over financial reporting includes those policies and procedures that (1) pertain to the maintenance of records that, in reasonable detail, accurately and fairly reflect the transactions and dispositions of the assets of the company; (2) provide reasonable assurance that transactions are recorded as necessary to permit preparation of financial statements in accordance with generally accepted accounting principles, and that receipts and expenditures of the company are being made only in accordance with authorizations of management and directors of the company; and (3) provide reasonable assurance regarding prevention or timely detection of unauthorized acquisition, use, or disposition of the company’s assets that could have a material effect on the financial statements.

Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Also, projections of any evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate.

Kansas City, Missouri

February 22, 2018

120

Item 9b. OTHER INFORMATION

None

PART III

Item 10. DIRECTORS, EXECUTIVE OFFICERS AND CORPORATE GOVERNANCE

The information required by Items 401, 405 and 407(c)(3), (d)(4) and (d)(5) of Regulation S-K regarding executive officers, directors, and corporate governance is included at the end of Part I of this Form 10-K under the caption “Executive Officers of the Registrant” and under the captions “Proposal One - Election of the 2021 Class of Directors”, “Section 16(a) Beneficial Ownership Reporting Compliance”, “Audit and Risk Committee Report”, “Committees of the Board" and "Shareholder Proposals and Nominations" in the definitive proxy statement, which is incorporated herein by reference.

The Company’s senior financial officer code of ethics for the chief executive officer and senior financial officers of the Company, including the chief financial officer, principal accounting officer or controller, or persons performing similar functions, is available at www.commercebank.com. Amendments to, and waivers of, the code of ethics are posted on this Web site.

Item 11. EXECUTIVE COMPENSATION

The information required by Items 402 and 407(e)(4) and (e)(5) of Regulation S-K regarding executive compensation is included under the captions “Compensation Discussion and Analysis”, “Executive Compensation”, “Director Compensation”, “Compensation and Human Resources Committee Report”, and “Compensation and Human Resources Committee Interlocks and Insider Participation” in the definitive proxy statement, which is incorporated herein by reference.

Item 12. SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND MANAGEMENT AND RELATED STOCKHOLDER MATTERS

The information required by Items 201(d) and 403 of Regulation S-K is included under the captions “Equity Compensation Plan Information” and “Security Ownership of Certain Beneficial Owners and Management” in the definitive proxy statement, which is incorporated herein by reference.

Item 13. CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS, AND DIRECTOR INDEPENDENCE

The information required by Items 404 and 407(a) of Regulation S-K is covered under the captions “Proposal One - Election of the 2021 Class of Directors” and “Corporate Governance” in the definitive proxy statement, which is incorporated herein by reference.

Item 14. PRINCIPAL ACCOUNTING FEES AND SERVICES

The information required by Item 9(e) of Schedule 14A is included under the captions “Pre-approval of Services by the External Auditor” and “Fees Paid to KPMG LLP” in the definitive proxy statement, which is incorporated herein by reference.

121

PART IV

Item 15. EXHIBITS AND FINANCIAL STATEMENT SCHEDULES

(a) The following documents are filed as a part of this report:
			Page
	(1)	Financial Statements:
		Consolidated Balance Sheets	61
		Consolidated Statements of Income	62
		Consolidated Statements of Comprehensive Income	63
		Consolidated Statements of Cash Flows	64
		Consolidated Statements of Changes in Equity	65
		Notes to Consolidated Financial Statements	66
		Summary of Quarterly Statements of Income	55
	(2)	Financial Statement Schedules:
		All schedules are omitted as such information is inapplicable or is included in the financial statements.
(b) The exhibits filed as part of this report and exhibits incorporated herein by reference to other documents are listed below.

3 —Articles of Incorporation and By-Laws:
	(a) Restated Articles of Incorporation, as amended, were filed in quarterly report on Form 10-Q (Commission file number 0-2989) dated May 7, 2014, and the same are hereby incorporated by reference.
	(b) Restated By-Laws, as amended, were filed in current report on Form 8-K (Commission file number 0-2989) dated February 14, 2013, and the same are hereby incorporated by reference.
4 — Instruments defining the rights of security holders, including indentures:
	(a) Pursuant to paragraph (b)(4)(iii) of Item 601 Regulation S-K, Registrant will furnish to the Commission upon request copies of long-term debt instruments.
10 — Material Contracts (Each of the following is a management contract or compensatory plan arrangement):
	(a) Commerce Bancshares, Inc. Executive Incentive Compensation Plan amended and restated as of January 1, 2009 was filed in quarterly report on Form 10-Q (Commission file number 0-2989) dated August 7, 2009, and the same is hereby incorporated by reference.
	(b) Commerce Bancshares, Inc. Stock Purchase Plan for Non-Employee Directors amended and restated as of April 17, 2013 was filed in current report on Form 8-K (Commission file number 0-2989) dated April 23, 2013, and the same is hereby incorporated by reference.
	(c) Commerce Executive Retirement Plan amended and restated as of January 28, 2011 was filed in annual report on Form 10-K (Commission file number 0-2989) dated February 25, 2011, and the same is hereby incorporated by reference.
	(d)(1) 2009 Form of Severance Agreement between Commerce Bancshares, Inc. and the persons listed at the end of such agreement was filed in annual report on Form 10-K (Commission file number 0-2989) dated February 24, 2015, and the same is hereby incorporated by reference.
	(d)(2) 2015 Form of Severance Agreement between Commerce Bancshares, Inc. and the persons listed at the end of such agreement was filed in annual report on Form 10-K (Commission file number 0-2989) dated February 24, 2015, and the same is hereby incorporated by reference.
	(e) Trust Agreement for the Commerce Bancshares, Inc. Executive Incentive Compensation Plan amended and restated as of January 1, 2001 was filed in quarterly report on Form 10-Q (Commission file number 0-2989) dated May 8, 2001, and the same is hereby incorporated by reference.

122

	(f) Commerce Bancshares, Inc. 2018 Compensatory Arrangements with CEO and Named Executive Officers were filed in amended current report on Form 8-K (Commission file number 0-2989) dated February 15, 2018, and the same is hereby incorporated by reference.
	(g) Commerce Bancshares, Inc. 2005 Equity Incentive Plan amended and restated as of April 17, 2013 was filed in current report on Form 8-K (Commission file number 0-2989) dated April 23, 2013, and the same is hereby incorporated by reference.
	(h) Commerce Bancshares, Inc. Stock Appreciation Rights Agreement and Commerce Bancshares, Inc. Restricted Stock Award Agreement, pursuant to the 2005 Equity Incentive Plan, were filed in current report on Form 8-K (Commission file number 0-2989) dated February 23, 2006, and the same are hereby incorporated by reference.
	(i) Commerce Bancshares, Inc. Stock Appreciation Rights Agreement, Commerce Bancshares, Inc. Restricted Stock Award Agreements for Executive Officers, and Commerce Bancshares, Inc. Restricted Stock Award Agreements for Employees other than Executive Officers, pursuant to the 2005 Equity Incentive Plan, were filed in quarterly report on Form 10-Q (Commission file number 0-2989) dated May 6, 2013, and the same are hereby incorporated by reference.
	(j) Form of Notice of Grant of Award and Award Agreement for Restricted Stock for Executive Officers, pursuant to the Commerce Bancshares, Inc. 2005 Equity Incentive Plan, was filed in quarterly report on Form 10-Q (Commission file number 0-2989) dated May 7, 2014, and the same is hereby incorporated by reference.
	(k) Form of Notice of Grant of Award and Award Agreement for Restricted Stock for Employees other than Executive Officers, pursuant to the Commerce Bancshares, Inc. 2005 Equity Incentive Plan, was filed in quarterly report on Form 10-Q (Commission file number 0-2989) dated May 7, 2014, and the same is hereby incorporated by reference.
	(l) Form of Notice of Grant of Award and Award Agreement for Stock Appreciation Rights, pursuant to the Commerce Bancshares, Inc. 2005 Equity Incentive Plan, was filed in quarterly report on Form 10-Q (Commission file number 0-2989) dated May 7, 2014, and the same is hereby incorporated by reference.
21 — Subsidiaries of the Registrant
23 — Consent of Independent Registered Public Accounting Firm
24 — Power of Attorney
31.1 — Certification of CEO pursuant to Section 302 of the Sarbanes-Oxley Act of 2002
31.2 — Certification of CFO pursuant to Section 302 of the Sarbanes-Oxley Act of 2002
32 — Certifications of CEO and CFO pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002
101 — Interactive data files pursuant to Rule 405 of Regulation S-T: (i) the Consolidated Balance Sheets, (ii) the Consolidated Statements of Income, (iii) the Consolidated Statements of Comprehensive Income, (iv) the Consolidated Statements of Changes in Equity, (v) the Consolidated Statements of Cash Flows and (vi) the Notes to Consolidated Financial Statements, tagged as blocks of text and in detail

Item 16. FORM 10-K SUMMARY

None.

123

SIGNATURES

Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized this 22nd day of February 2018.

COMMERCE BANCSHARES, INC.
By:	/s/ THOMAS J. NOACK
	Thomas J. Noack
	Vice President and Secretary

Pursuant to the requirements of the Securities Exchange Act of 1934, this report has been signed below by the following persons on behalf of the Registrant and in the capacities indicated on the 22nd day of February 2018.

By:	/s/ DAVID W. KEMPER
	David W. Kemper
	Chief Executive Officer
By:	/s/ CHARLES G. KIM
	Charles G. Kim
	Chief Financial Officer
By:	/s/ JEFFERY D. ABERDEEN
	Jeffery D. Aberdeen
	Controller
	(Chief Accounting Officer)

David W. Kemper
Terry D. Bassham
John R. Capps
Earl H. Devanny, III
W. Thomas Grant, II
James B. Hebenstreit
John W. Kemper		All the Directors on the Board of Directors*
Jonathan M. Kemper
Benjamin F. Rassieur, III
Todd R. Schnuck
Andrew C. Taylor
Kimberly G. Walker

____________

* The Directors of Registrant listed executed a power of attorney authorizing Thomas J. Noack, their attorney-in-fact, to sign this report on their behalf.

By:	/s/ THOMAS J. NOACK
	Thomas J. Noack
	Attorney-in-Fact

124

EX-21

Exhibit 21

The consolidated subsidiaries of the Registrant at February 1, 2018 were as follows:

Name	Location	State or Other Jurisdiction of Incorporation
CBI-Kansas, Inc.	Kansas City, MO	Kansas
Commerce Bank	Kansas City, MO	Missouri
Commerce Brokerage Services, Inc.	Clayton, MO	Missouri
Clayton Holdings, LLC	Kansas City, MO	Missouri
Clayton Financial Corp.	Clayton, MO	Missouri
Clayton Realty Corp.	Clayton, MO	Missouri
Illinois Financial, LLC	Peoria, IL	Delaware
Illinois Realty, LLC	Peoria, IL	Delaware
Commerce Insurance Services, Inc.	Fenton, MO	Missouri
Commerce Investment Advisors, Inc.	Kansas City, MO	Missouri
CBI Equipment Finance, Inc.	Kansas City, MO	Missouri
Mid-Am Acquisition, LLC	Clayton, MO	Missouri
Tower Redevelopment Corporation	Kansas City, MO	Missouri
CBI Insurance Company	Kansas City, MO	Arizona
CFB Partners, LLC	Clayton, MO	Delaware
CFB Venture Fund I, Inc.	Kansas City, MO	Missouri
CFB Venture Fund, L.P.	Clayton, MO	Delaware
Capital for Business, Inc.	Kansas City, MO	Missouri

EX-23

Exhibit 23

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

The Board of Directors

Commerce Bancshares, Inc.:

We consent to the incorporation by reference in the Registration Statements No. 33-28294, No. 33-82692, No. 33-8075, No. 33-78344, No. 333-14651, No. 333-186867, No. 333-188374, and No. 333-214495, each on Form S-8, and No. 333-140221 and No. 333-196689, each on Form S-3ASR of Commerce Bancshares, Inc. of our reports dated February 22, 2018, with respect to the consolidated balance sheets of Commerce Bancshares, Inc. and subsidiaries as of December 31, 2017 and 2016, and the related consolidated statements of income, comprehensive income, cash flows, and changes in equity for each of the years in the three-year period ended December 31, 2017, and the effectiveness of internal control over financial reporting as of December 31, 2017, which reports appear in the December 31, 2017 annual report on Form 10-K of Commerce Bancshares, Inc.

KPMG LLP

Kansas City, Missouri

February 22, 2018

EX-24

Exhibit 24

POWER OF ATTORNEY

KNOW ALL MEN BY THESE PRESENTS, that the undersigned do hereby appoint Thomas J. Noack and Jeffery D. Aberdeen, or either of them, attorney for the undersigned to sign the Annual Report on Form 10-K of Commerce Bancshares, Inc., for the fiscal year ended December 31, 2017, together with any and all amendments which might be required from time to time with respect thereto, to be filed with the Securities and Exchange Commission under the Securities Exchange Act of 1934, with respect to Commerce Bancshares, Inc., with full power and authority in either of said attorneys to do and perform in the name of and on behalf of the undersigned every act whatsoever necessary or desirable to be done in the premises as fully and to all intents and purposes as the undersigned might or could do in person.

IN WITNESS WHEREOF, the undersigned have executed these presents as of this 26th day of January, 2018.

/s/ TERRY D. BASSHAM

/s/ JOHN R. CAPPS

/s/ EARL H. DEVANNY, III

/s/ W. THOMAS GRANT, II

/s/ JAMES B. HEBENSTREIT

/s/ DAVID W. KEMPER

/s/ JOHN W. KEMPER

/s/ JONATHAN M. KEMPER                    

/s/ BENJAMIN F. RASSIEUR, III

/s/ TODD R. SCHNUCK

/s/ ANDREW C. TAYLOR                

/s/ KIMBERLY G. WALKER

EX-31.1

Exhibit 31.1

CERTIFICATION

I, David W. Kemper, certify that:

1. I have reviewed this annual report on Form 10-K of Commerce Bancshares, Inc.;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

(a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c) Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d) Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

(a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

(b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

	/s/ DAVID W. KEMPER
	David W. Kemper Chairman and Chief Executive Officer
February 22, 2018

EX-31.2

Exhibit 31.2

CERTIFICATION

I, Charles G. Kim, certify that:

1. I have reviewed this annual report on Form 10-K of Commerce Bancshares, Inc.;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

(a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c) Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d) Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

(a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

(b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

	/s/ CHARLES G. KIM
	Charles G. Kim Executive Vice President and Chief Financial Officer
February 22, 2018

EX-32

Exhibit 32

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Annual Report of Commerce Bancshares, Inc. (the “Company”) on Form 10-K for the year ended December 31, 2017 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), we, David W. Kemper and Charles G. Kim, Chief Executive Officer and Chief Financial Officer, respectively, of the Company, hereby certify, pursuant to 18 U.S.C. Section 1350 as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that, to the best of our knowledge:

(1) The Report fully complies with the requirements of section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(2) The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

	/s/ DAVID W. KEMPER
	David W. Kemper Chief Executive Officer
	/s/ CHARLES G. KIM
	Charles G. Kim Chief Financial Officer
February 22, 2018

A signed original of this written statement required by Section 906 has been provided to the Company and will be retained by the Company and furnished to the Securities and Exchange Commission or its staff upon request.

XML

Document And Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2017	Feb. 09, 2018	Jun. 30, 2017
Document And Entity Information [Abstract]
Document Period End Date	Dec. 31, 2017
Document Fiscal Year Focus	2017
Document Type	10-K
Amendment Flag	false
Document Fiscal Period Focus	FY
Entity Registrant Name	COMMERCE BANCSHARES INC /MO/
Entity Central Index Key	0000022356
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		106,710,134
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Public Float			$ 5,271,000,000

XML

Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
ASSETS
Loans	$ 13,983,674	$ 13,412,736
Allowance for loan losses	(159,532)	(155,932)
Net loans	13,824,142	13,256,804
Loans Receivable Held-for-sale, Amount	21,398	14,456
Investment securities:
Available for sale Securities	8,774,280	9,649,203
Trading	18,269	22,225
Non-marketable	100,758	99,558
Total investment securities	8,893,307	9,770,986
Federal funds sold and short-term securities purchased under agreements to resell	42,775	15,470
Long-term securities purchased under agreements to resell	700,000	725,000
Interest-bearing deposits with banks	30,631	272,275
Cash and due from banks	438,439	494,690
Land, buildings and equipment – net	335,110	337,705
Goodwill	138,921	138,921
Other intangible assets – net	7,618	6,709
Other assets	401,074	608,408
Total assets	24,833,415	25,641,424
LIABILITIES AND STOCKHOLDERS’ EQUITY
Non-interest bearing	7,158,962	7,429,398
Savings, interest checking and money market	11,499,620	11,430,789
Time open and C.D.’s of less than $100,000	634,646	713,075
Time open and C.D.'s of $100,000 and over	1,132,218	1,527,833
Total deposits	20,425,446	21,101,095
Federal funds purchased and securities sold under agreements to repurchase	1,507,138	1,723,905
Other borrowings	1,758	102,049
Other liabilities	180,889	213,243
Total liabilities	22,115,231	23,140,292
Commerce Bancshares, Inc. stockholders’ equity:
Preferred stock, $1 par value	144,784	144,784
Common stock, $5 par value	535,407	510,015
Capital surplus	1,815,360	1,552,454
Retained earnings	221,374	292,849
Treasury stock, at cost	(14,473)	(15,294)
Accumulated other comprehensive income	14,108	10,975
Total Commerce Bancshares, Inc. stockholders’ equity	2,716,560	2,495,783
Non-controlling interest	1,624	5,349
Total equity	2,718,184	2,501,132
Total liabilities and equity	$ 24,833,415	$ 25,641,424

XML

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Mortgage Loans:
Mortgages Held-for-sale, Fair Value Disclosure	$ 15,327	$ 9,263
Investment Securities:
Available for sale securities, pledged	$ 662,515	$ 568,553
Stockholders' Equity:
Preferred stock, par value	$ 1.00	$ 1.00
Preferred stock, shares authorized	2,000,000	2,000,000
Preferred stock, shares issued	6,000	6,000
Common stock, par value	$ 5.00	$ 5.00
Common stock, shares authorized	120,000,000	120,000,000
Common stock, shares issued	107,081,397	102,003,046
Treasury stock, shares	276,968	364,711

XML

Consolidated Statements Of Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
INTEREST INCOME
Interest and fees on loans	$ 543,825	$ 489,956	$ 456,664
Interest on loans held for sale	1,000	1,317	191
Interest on investment securities	214,689	207,184	191,801
Interest on federal funds sold and short-term securities purchased under agreements to resell	230	78	60
Interest on long-term securities purchased under agreements to resell	15,440	13,544	13,172
Interest on deposits with banks	2,223	973	528
Total interest income	777,407	713,052	662,416
INTEREST EXPENSE
Savings, interest checking and money market	17,309	14,366	13,374
Time open and C.D.’s of less than $100,000	2,645	2,809	3,236
Time open and C.D.’s of $100,000 and over	10,859	8,545	6,051
Interest on federal funds purchased and securities sold under agreements to repurchase	9,829	3,315	1,861
Interest on other borrowings	3,086	3,968	3,574
Total interest expense	43,728	33,003	28,096
Net interest income	733,679	680,049	634,320
Provision for loan losses	45,244	36,318	28,727
Net interest income after provision for loan losses	688,435	643,731	605,593
NON-INTEREST INCOME
Bank card transaction fees	180,441	181,879	178,926
Trust fees	135,159	121,795	118,437
Deposit account charges and other fees	90,060	86,394	80,416
Noninterest Income, Other	7,996	10,655	11,476
Capital market fees	14,630	13,784	13,784
Loan fees and sales	13,948	11,412	8,228
Other	44,370	48,473	36,872
Total non-interest income	486,604	474,392	448,139
INVESTMENT SECURITIES GAINS (LOSSES), NET
Investment securities gains (losses), net	25,051	(53)	6,320
NON-INTEREST EXPENSE
Salaries and employee benefits	448,321	427,310	400,701
Net occupancy	45,612	46,290	44,788
Equipment	18,568	19,141	19,086
Supplies and communication	22,790	24,135	22,970
Data processing and software	92,246	92,722	83,944
Marketing	16,325	16,032	16,107
Deposit insurance	13,986	13,327	12,146
Community Service	34,377	3,906	3,180
Other	77,459	74,202	73,565
Total non-interest expense	769,684	717,065	676,487
Income before income taxes	430,406	401,005	383,565
Less income taxes	110,506	124,151	116,590
Net income	319,900	276,854	266,975
Less non-controlling interest expense	517	1,463	3,245
NET INCOME ATTRIBUTABLE TO COMMERCE BANCSHARES, INC.	319,383	275,391	263,730
Preferred stock dividends	9,000	9,000	9,000
Net Income (Loss) Available to Common Stockholders, Basic	$ 310,383	$ 266,391	$ 254,730
Net income per common share - basic (in dollars per share)	$ 2.90	$ 2.50	$ 2.33
Net income per common share - diluted (in dollars per share)	$ 2.89	$ 2.49	$ 2.32

XML

Consolidated Statements Of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Statement of Comprehensive Income [Abstract]
Net income	$ 319,900	$ 276,854	$ 266,975
Other comprehensive income (loss):
Net unrealized gains (losses) on securities for which a portion of an other-than-temporary impairment has been recorded in earnings	412	(341)	(518)
Net unrealized gains (losses) on other securities	3,022	(22,422)	(31,517)
Change in pension loss	(301)	1,268	2,412
Other comprehensive income (loss)	3,133	(21,495)	(29,623)
Comprehensive income	323,033	255,359	237,352
Non-controlling interest expense	517	1,463	3,245
Comprehensive income attributable to Commerce Bancshares, Inc.	$ 322,516	$ 253,896	$ 234,107

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Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
OPERATING ACTIVITIES:
Net income	$ 319,900	$ 276,854	$ 266,975
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for loan losses	45,244	36,318	28,727
Provision for depreciation and amortization	39,732	40,929	42,803
Amortization of investment security premiums, net	35,423	31,493	32,618
Deferred income tax (benefit) expense	13,617	(2,059)	7,432
Investment securities (gains) losses, net	(25,051)	53	(6,320)
Net gains on sales of loans held for sale	(8,008)	(5,850)	(3,076)
Proceeds from sales of loans held for sale	215,373	160,875	97,813
Origination Of Loans Held For Sale	(216,064)	(163,469)	(103,199)
Net (increase) decrease in trading securities	7,585	73,780	(86,045)
Stock-based compensation	12,105	11,525	10,147
(Increase) decrease in interest receivable	(4,459)	(3,642)	(4,992)
Decrease in interest payable	38	1,107	336
Increase (decrease) in income taxes payable	(27,685)	4,509	11,733
Donation of securities	32,036	0	0
Other changes, net	(6,560)	(26,666)	(3,757)
Net cash provided by (used in) operating activities	433,226	435,757	291,195
INVESTING ACTIVITIES
Proceeds from sales of available for sale securities	792,380	24,380	689,031
Proceeds from maturities/pay downs of available for sale securities	1,899,640	2,032,397	2,515,113
Purchases of available for sale securities	(1,853,817)	(1,988,101)	(3,542,537)
Net (increase) decrease in loans	(614,849)	(1,009,523)	(1,005,657)
Repayments of long-term securities purchased under agreements to resell	(75,000)	(250,000)	0
Proceeds from Securities Purchased under Agreements to Resell	100,000	400,000	175,000
Purchases of land, buildings and equipment	(30,824)	(24,478)	(31,897)
Sales of land, buildings and equipment	3,190	10,112	5,545
Net cash provided by (used in) investing activities	220,720	(805,213)	(1,195,402)
FINANCING ACTIVITIES
Net increase (decrease) in non-interest bearing, savings, interest checking and money market deposits	(15,036)	782,846	545,147
Net increase (decrease) in time open and C.D.’s	(474,044)	243,199	(124,509)
Net increase (decrease) in short-term federal funds purchased and securities sold under agreements to repurchase	(216,767)	(239,647)	101,034
Repayment of other long-term borrowings	(100,291)	(1,769)	(240)
Purchases of treasury stock	(17,771)	(39,381)	(23,176)
Accelerated stock repurchase agreement net outflow	0	0	(100,000)
Issuance of stock under equity compensation plans	(8)	(6)
Proceeds from stock options exercised			1,914
Cash dividends paid on common stock	(91,619)	(87,070)	(84,961)
Cash dividends paid on preferred stock	(9,000)	(9,000)	(9,000)
Net cash provided by (used in) financing activities	(924,536)	649,172	306,209
Increase (decrease) in cash and cash equivalents	(270,590)	279,716	(597,998)
Cash and cash equivalents at beginning of year	782,435	502,719	1,100,717
Cash and cash equivalents at end of year	511,845	782,435	502,719
Supplemental Cash Flow Information:
Income tax payments, net	120,744	119,596	95,341
Interest paid on deposits and borrowings	43,690	31,896	27,760
Loans transferred to foreclosed real estate	2,063	1,122	3,778
Accelerated Share Repurchases, Settlement (Payment) or Receipt	0	0	60,000
Transfer of Portfolio Loans and Leases to Held-for-sale	$ 0	$ 42,688	$ 0

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Consolidated Statements Of Changes In Equity - USD ($) $ in Thousands	Total	Preferred Stock [Member]	Common Stock	Capital Surplus	Retained Earnings	Treasury Stock	Accumulated Other Comprehensive Income (Loss)	Non-Controlling Interest
Balance at Dec. 31, 2014	$ 2,334,246	$ 144,784	$ 484,155	$ 1,229,075	$ 426,648	$ (16,562)	$ 62,093	$ 4,053
Net income	266,975				263,730			3,245
Other comprehensive income	(29,623)						(29,623)
Distributions to non-controlling interest	(1,870)							(1,870)
Purchase of treasury stock	(23,176)					(23,176)
Accelerated share repurchase forward contract	(100,000)			60,000		(160,000)
Cash dividends paid on common stock	(84,961)				(84,961)
Cash dividends paid on preferred stock	(9,000)				(9,000)
Net tax benefit related to equity compensation plans	2,132			2,132
Stock-based compensation	10,147			10,147
Issuance under stock purchase and equity compensation plans, net	2,888			(16,615)		19,503
5% stock dividend, net	(340)		5,707	52,938	(213,104)	154,119
Balance at Dec. 31, 2015	2,367,418	144,784	489,862	1,337,677	383,313	(26,116)	32,470	5,428
Net income	276,854				275,391			1,463
Other comprehensive income	(21,495)						(21,495)
Distributions to non-controlling interest	(1,542)							(1,542)
Purchase of treasury stock	(39,381)					(39,381)
Cash dividends paid on common stock	(87,070)				(87,070)
Cash dividends paid on preferred stock	(9,000)				(9,000)
Net tax benefit related to equity compensation plans	3,390			3,390
Stock-based compensation	11,525			11,525
Issuance under stock purchase and equity compensation plans, net	911			(15,810)		16,721
5% stock dividend, net	(478)		20,153	215,672	(269,785)	33,482
Balance at Dec. 31, 2016	2,501,132		510,015	1,552,454	292,849	(15,294)	10,975	5,349
Adoption for ASU 2016-09	1,297			3,441	(2,144)
Net income	319,900				319,383			517
Other comprehensive income	3,133						3,133
Distributions to non-controlling interest	(1,293)							(1,293)
Sale of non-controlling interest in subsidiary	1			2,950				(2,949)
Purchase of treasury stock	(17,771)					(17,771)
Cash dividends paid on common stock	(91,619)				(91,619)
Cash dividends paid on preferred stock	(9,000)				(9,000)
Stock-based compensation	12,105			12,105
Issuance under stock purchase and equity compensation plans, net	858			(17,734)		18,592
5% stock dividend, net	(559)		25,392	262,144	(288,095)
Balance at Dec. 31, 2017	$ 2,718,184	$ 144,784	$ 535,407	$ 1,815,360	$ 221,374	$ (14,473)	$ 14,108	$ 1,624

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Consolidated Statements Of Changes In Equity (Parenthetical) - $ / shares	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Statement of Stockholders' Equity [Abstract]
Cash dividends paid on common stock (per share)	$ 0.857	$ 0.816	$ 0.777
Cash dividends paid on preferred stock (per share)	$ 1.500	$ 1.500	$ 1.500
Stock dividend rate (percent)	5.00%	5.00%	5.00%

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Summary of Significant Accounting Policies

12 Months Ended

Dec. 31, 2017

Accounting Policies [Abstract]

Summary of Significant Accounting Policies

Summary of Significant Accounting Policies

Nature of Operations

Commerce Bancshares, Inc. and its subsidiaries (the Company) conducts its principal activities from approximately 330 locations throughout Missouri, Illinois, Kansas, Oklahoma and Colorado. Principal activities include retail and commercial banking, investment management, securities brokerage, mortgage banking, credit related insurance and private equity investment activities.

Basis of Presentation

The Company follows accounting principles generally accepted in the United States of America (GAAP) and reporting practices applicable to the banking industry. The preparation of financial statements under GAAP requires management to make estimates and assumptions that affect the amounts reported in the financial statements and notes. These estimates are based on information available to management at the time the estimates are made. While the consolidated financial statements reflect management’s best estimates and judgments, actual results could differ from those estimates. The consolidated financial statements include the accounts of the Company and its majority-owned subsidiaries (after elimination of all material intercompany balances and transactions). Certain prior year amounts have been reclassified to conform to the current year presentation. Such reclassifications had no effect on net income or total assets. Management has evaluated subsequent events for potential recognition or disclosure through the date these consolidated financial statements were issued.

The Company, in the normal course of business, engages in a variety of activities that involve variable interest entities (VIEs). A VIE is a legal entity that lacks equity investors or whose equity investors do not have a controlling financial interest in the entity through their equity investments. However, an enterprise is deemed to have a controlling financial interest and is the primary beneficiary of a VIE if it has both the power to direct the activities of the VIE that most significantly impact the VIE’s economic performance and an obligation to absorb losses or the right to receive benefits that could potentially be significant to the VIE. An enterprise that is the primary beneficiary must consolidate the VIE. The Company’s interests in VIEs are evaluated to determine if the Company is the primary beneficiary both at inception and when there is a change in circumstances that requires a reconsideration.

The Company is considered to be the primary beneficiary in a rabbi trust related to a deferred compensation plan offered to certain employees. The assets and liabilities of this trust, which are included in the accompanying consolidated balance sheets, are not significant. The Company also has variable interests in certain entities in which it is not the primary beneficiary. These entities are not consolidated. These interests include affordable housing limited partnership interests, holdings in its investment portfolio of various asset and mortgage-backed bonds that are issued by securitization trusts, and managed discretionary trust assets that are not included in the accompanying consolidated balance sheets.

Cash and Cash Equivalents

In the accompanying consolidated statements of cash flows, cash and cash equivalents include “Cash and due from banks”, “Federal funds sold and short-term securities purchased under agreements to resell”, and “Interest earning deposits with banks” as segregated in the accompanying consolidated balance sheets.

Regulations of the Federal Reserve System require cash balances to be maintained at the Federal Reserve Bank, based on certain deposit levels. The minimum reserve requirement for the Bank at December 31, 2017 totaled $126.1 million, while cash held at the Federal Reserve Bank totaled $30.6 million. Additionally, as of December 31, 2017, the Company had $12.5 million in cash collateral on deposit with another financial institution relating to interest rate swap transactions.

Loans and Related Earnings

Loans that management has the intent and ability to hold for the foreseeable future or until maturity or pay-off are reported at their outstanding principal balances, net of undisbursed loan proceeds, the allowance for loan losses, and any deferred fees and costs on originated loans. Origination fee income received on loans and amounts representing the estimated direct costs of origination are deferred and amortized to interest income over the life of the loan using the interest method.

Interest on loans is accrued based upon the principal amount outstanding. Interest income is recognized primarily on the level yield method. Loan and commitment fees, net of costs, are deferred and recognized in income over the term of the loan or commitment as an adjustment of yield. Annual fees charged on credit card loans are capitalized to principal and amortized over 12 months to loan fees and sales. Other credit card fees, such as cash advance fees and late payment fees, are recognized in income as an adjustment of yield when charged to the cardholder’s account.

Non-Accrual Loans

Loans are placed on non-accrual status when management does not expect to collect payments consistent with acceptable and agreed upon terms of repayment. Business, construction real estate, business real estate, and personal real estate loans that are contractually 90 days past due as to principal and/or interest payments are generally placed on non-accrual, unless they are both well-secured and in the process of collection. Consumer, revolving home equity and credit card loans are exempt under regulatory rules from being classified as non-accrual. When a loan is placed on non-accrual status, any interest previously accrued but not collected is reversed against current income, and the loan is charged off to the extent uncollectible. Principal and interest payments received on non-accrual loans are generally applied to principal.Interest is included in income only after all previous loan charge-offs have been recovered and is recorded only as received. The loan is returned to accrual status only when the borrower has brought all past due principal and interest payments current, and, in the opinion of management, the borrower has demonstrated the ability to make future payments of principal and interest as scheduled. A six month history of sustained payment performance is generally required before reinstatement of accrual status.

Restructured Loans

A loan is accounted for as a troubled debt restructuring if the Company, for economic or legal reasons related to the borrowers’ financial difficulties, grants a concession to the borrower that it would not otherwise consider. A troubled debt restructuring typically involves (1) modification of terms such as a reduction of the stated interest rate, loan principal, or accrued interest, (2) a loan renewal at a stated interest rate lower than the current market rate for a new loan with similar risk, or (3) debt that was not reaffirmed in bankruptcy. Business, business real estate, construction real estate and personal real estate troubled debt restructurings with impairment charges are placed on non-accrual status. The Company measures the impairment loss of a troubled debt restructuring in the same manner as described below. Troubled debt restructurings which are performing under their contractual terms continue to accrue interest which is recognized in current earnings.

Impaired Loans

Loans are evaluated regularly by management for impairment. Included in impaired loans are all non-accrual loans, as well as loans that have been classified as troubled debt restructurings. Once a loan has been identified as impaired, impairment is measured based on either the present value of the expected future cash flows at the loan’s initial effective interest rate or the fair value of the collateral if collateral dependent. Factors considered in determining impairment include delinquency status, cash flow analysis, credit analysis, and collateral value and availability.

Loans Held For Sale

Loans held for sale include student loans and certain fixed rate residential mortgage loans. These loans are typically classified as held for sale upon origination based upon management's intent to sell the production of these loans. The student loans are carried at the lower of aggregate cost or fair value, and their fair value is determined based on sale contract prices. The mortgage loans are carried at fair value under the elected fair value option. Their fair value is based on secondary market prices for loans with similar characteristics, including an adjustment for embedded servicing value. Changes in fair value and gains and losses on sales are included in loan fees and sales. Deferred fees and costs related to these loans are not amortized but are recognized as part of the cost basis of the loan at the time it is sold. Interest income related to loans held for sale is accrued based on the principal amount outstanding and the loan's contractual interest rate.

Occasionally, other types of loans may be classified as held for sale in order to manage credit concentration. These loans are carried at the lower of cost or fair value with gains and losses on sales recognized in loan fees and sales.

Allowance/Provision for Loan Losses

The allowance for loan losses is maintained at a level believed to be appropriate by management to provide for probable loan losses inherent in the portfolio as of the balance sheet date, including losses on known or anticipated problem loans as well as for loans which are not currently known to require specific allowances. Management has established a process to determine the amount of the allowance for loan losses which assesses the risks and losses inherent in its portfolio. Business, construction real estate and business real estate loans are normally larger and more complex, and their collection rates are harder to predict. These loans are more likely to be collateral dependent and are allocated a larger reserve, due to their potential volatility. Personal real estate, credit card, consumer and revolving home equity loans are individually smaller and perform in a more homogenous manner, making loss estimates more predictable. Management’s process provides an allowance consisting of a specific allowance component based on certain individually evaluated loans and a general component based on estimates of reserves needed for pools of loans.

Loans subject to individual evaluation generally consist of business, construction real estate, business real estate and personal real estate loans on non-accrual status. These impaired loans are evaluated individually for the impairment of repayment potential and collateral adequacy. Other impaired loans identified as performing troubled debt restructurings are collectively evaluated because they have similar risk characteristics. Loans which have not been identified as impaired are segregated by loan type and sub-type and are collectively evaluated. Reserves calculated for these loan pools are estimated using a consistent methodology that considers historical loan loss experience by loan type, loss emergence periods, delinquencies, current economic factors, loan risk ratings and industry concentrations.

The Company’s estimate of the allowance for loan losses and the corresponding provision for loan losses is based on various judgments and assumptions made by management. The amount of the allowance for loan losses is influenced by several qualitative factors which include collateral valuation, evaluation of performance and status, current loan portfolio composition and characteristics, trends in delinquencies, portfolio risk ratings, levels of non-performing assets, and prevailing regional and national economic and business conditions.

The estimates, appraisals, evaluations, and cash flows utilized by management may be subject to frequent adjustments due to changing economic prospects of borrowers or properties. These estimates are reviewed periodically and adjustments, if necessary, are recorded in the provision for loan losses in the periods in which they become known.

Loans, or portions of loans, are charged off to the extent deemed uncollectible. Loan charge-offs reduce the allowance for loan losses, and recoveries of loans previously charged off are added back to the allowance. Business, business real estate, construction real estate and personal real estate loans are generally charged down to estimated collectible balances when they are placed on non-accrual status. Consumer loans and related accrued interest are normally charged down to the fair value of related collateral (or are charged off in full if no collateral) once the loans are more than 120 days delinquent. Credit card loans are charged off against the allowance for loan losses when the receivable is more than 180 days past due. The interest and fee income previously capitalized but not collected on credit card charge-offs is reversed against interest income.

Operating, Direct Financing and Sales Type Leases

The net investment in direct financing and sales type leases is included in loans on the Company’s consolidated balance sheets and consists of the present values of the sum of the future minimum lease payments and estimated residual value of the leased asset. Revenue consists of interest earned on the net investment and is recognized over the lease term as a constant percentage return thereon. The net investment in operating leases is included in other assets on the Company’s consolidated balance sheets. It is carried at cost, less the amount depreciated to date. Depreciation is recognized, on the straight-line basis, over the lease term to the estimated residual value. Operating lease revenue consists of the contractual lease payments and is recognized over the lease term in other non-interest income. Estimated residual values are established at lease inception utilizing contract terms, past customer experience, and general market data and are reviewed and adjusted, if necessary, on an annual basis.

Investments in Debt and Equity Securities

The Company has classified the majority of its investment portfolio as available for sale. From time to time, the Company sells securities and utilizes the proceeds to reduce borrowings, fund loan growth, or modify its interest rate profile. Securities classified as available for sale are carried at fair value. Changes in fair value, excluding certain losses associated with other-than-temporary impairment (OTTI), are reported in other comprehensive income (loss), a component of stockholders’ equity. Securities are periodically evaluated for OTTI in accordance with guidance provided in ASC 320-10-35. For securities with OTTI, the entire loss in fair value is required to be recognized in current earnings if the Company intends to sell the securities or believes it likely that it will be required to sell the security before the anticipated recovery. If neither condition is met, but the Company does not expect to recover the amortized cost basis, the Company determines whether a credit loss has occurred, and the loss is then recognized in current earnings. The noncredit-related portion of the overall loss is reported in other comprehensive income (loss). Gains and losses realized upon sales of securities are calculated using the specific identification method and are included in investment securities gains (losses), net, in the consolidated statements of income. Purchase premiums and discounts are amortized to interest income using a level yield method over the estimated lives of the securities. For mortgage and asset-backed securities, prepayment experience is evaluated quarterly to determine the appropriate estimate of the future rate of prepayment. When a change in a bond's estimated remaining life is necessary, a corresponding adjustment is made in the related amortization of premium or discount accretion.

Non-marketable securities include certain private equity investments, consisting of both debt and equity instruments. These securities are carried at fair value in accordance with ASC 946-10-15, with changes in fair value reported in current earnings. In the absence of readily ascertainable market values, fair value is estimated using internally developed models. Changes in fair value and gains and losses from sales are included in investment securities gains (losses), net in the consolidated statements of income. Other non-marketable securities acquired for debt and regulatory purposes are carried at cost and periodically evaluated for other-than-temporary impairment.

Trading account securities, which are bought and held principally for the purpose of resale in the near term, are carried at fair value. Gains and losses, both realized and unrealized, are recorded in non-interest income.

Purchases and sales of securities are recognized on a trade date basis. A receivable or payable is recognized for pending transaction settlements.    

Securities Purchased under Agreements to Resell and Securities Sold under Agreements to Repurchase

Securities purchased under agreements to resell and securities sold under agreements to repurchase are treated as collateralized financing transactions, not as purchases and sales of the underlying securities. The agreements are recorded at the amount of cash advanced or received.

The Company periodically enters into securities purchased under agreements to resell with large financial institutions. Securities pledged by the counterparties to secure these agreements are delivered to a third party custodian.

Securities sold under agreements to repurchase are a source of funding to the Company and are offered to cash management customers as an automated, collateralized investment account. From time to time, securities sold may also be used by the Bank to obtain additional borrowed funds at favorable rates. These borrowings are secured by a portion of the Company's investment security portfolio and delivered either to the dealer custody account at the FRB or to the applicable counterparty.

The fair value of collateral either received from or provided to a counterparty is monitored daily, and additional collateral is obtained, returned, or provided by the Company in order to maintain full collateralization for these transactions.

As permitted by current accounting guidance, the Company offsets certain securities purchased under agreements to resell against securities sold under agreements to repurchase in its balance sheet presentation. These agreements are further discussed in Note 18, Resale and Repurchase Agreements.

Land, Buildings and Equipment

Land is stated at cost, and buildings and equipment are stated at cost, including capitalized interest when appropriate, less accumulated depreciation. Depreciation is computed using a straight-line method, utilizing estimated useful lives; generally 30 years for buildings, 10 years for building improvements, and 3 to 10 years for equipment. Leasehold improvements are amortized over the shorter of 10 years or the remaining lease term. Maintenance and repairs are charged to non-interest expense as incurred.

Foreclosed Assets

Foreclosed assets consist of property that has been repossessed and is comprised of commercial and residential real estate and other non-real estate property, including auto and recreational and marine vehicles. The assets are initially recorded at fair value less estimated selling costs, establishing a new cost basis. Initial valuation adjustments are charged to the allowance for loan losses. Fair values are estimated primarily based on appraisals, third-party price opinions, or internally developed pricing models. After initial recognition, fair value estimates are updated periodically. Declines in fair value below cost are recognized through valuation allowances which may be reversed when supported by future increases in fair value. These valuation adjustments, in addition to gains and losses realized on sales and net operating expenses, are recorded in other non-interest expense.

Goodwill and Intangible Assets

Goodwill is not amortized but is assessed for impairment on an annual basis or more frequently in certain circumstances. When testing for goodwill impairment, the Company may initially perform a qualitative assessment. Based on the results of this qualitative assessment, if the Company concludes it is more likely than not that a reporting unit's fair value is less than its carrying amount, a quantitative analysis is performed. Quantitative valuation methodologies include a combination of formulas using current market multiples, based on recent sales of financial institutions within the Company's geographic marketplace. If the fair value of a reporting unit is less than the carrying amount, additional analysis is required to measure the amount of impairment. The Company has not recorded impairment resulting from goodwill impairment tests. However, adverse changes in the economic environment, operations of the reporting unit, or other factors could result in a decline in fair value.

Intangible assets that have finite useful lives, such as core deposit intangibles and mortgage servicing rights, are amortized over their estimated useful lives. Core deposit intangibles are amortized over periods of 8 to 14 years, representing their estimated lives, using accelerated methods. Mortgage servicing rights are amortized in proportion to and over the period of estimated net servicing income, considering appropriate prepayment assumptions. Core deposit intangibles are reviewed for impairment whenever events or changes in circumstances indicate their carrying amount may not be recoverable. Impairment is indicated if the sum of the undiscounted estimated future net cash flows is less than the carrying value of the intangible asset. Mortgage servicing rights, while initially recorded at fair value, are subsequently amortized and carried at the lower of the initial capitalized amount (net of accumulated amortization), or estimated fair value. The Company evaluates its mortgage servicing rights for impairment on a quarterly basis, using estimated prepayment speeds of the underlying mortgage loans serviced and stratifications based on the risk characteristics of the underlying loans. A valuation allowance has been established, through a charge to earnings, to the extent the amortized cost exceeds the estimated fair value. However, the Company has not recorded other-than-temporary impairment losses on either of these types of intangible assets.

Income Taxes

Amounts provided for income tax expense are based on income reported for financial statement purposes and do not necessarily represent amounts currently payable under tax laws. Deferred income taxes are provided for temporary differences between the financial reporting bases and income tax bases of the Company’s assets and liabilities, net operating losses, and tax credit carryforwards. Deferred tax assets and liabilities are measured using the enacted tax rates that are expected to apply to taxable income when such assets and liabilities are anticipated to be settled or realized. The effect on deferred tax assets and liabilities of a change in tax rates is recognized as tax expense or benefit in the period that includes the enactment date of the change. In determining the amount of deferred tax assets to recognize in the financial statements, the Company evaluates the likelihood of realizing such benefits in future periods. A valuation allowance is established if it is more likely than not that all or some portion of the deferred tax asset will not be realized. The Company recognizes interest and penalties related to income taxes within income tax expense in the consolidated statements of income.

The Company and its eligible subsidiaries file a consolidated federal income tax return. State and local income tax returns are filed on a combined, consolidated or separate return basis based upon each jurisdiction’s laws and regulations.

In December 2017, tax reform legislation was enacted which changed the maximum corporate tax rate for years 2018 and beyond. As such, deferred tax assets and liabilities were revalued in 2017 to account for the change in future tax rates. Additional information about current and deferred income taxes is provided in Note 8, Income Taxes.

Derivatives

While the Company’s interest rate risk management policy permits the use of hedge accounting for derivatives, all of the derivatives held by the Company during the past several years have been accounted for as free-standing instruments. These instruments are carried at fair value, and changes in fair value are recognized in current earnings. They include interest rate swaps and caps, which are offered to customers to assist in managing their risks of adverse changes in interest rates. Each contract between the Company and a customer is offset by a contract between the Company and an institutional counterparty, thus minimizing the Company's exposure to rate changes. The Company also enters into certain contracts, known as credit risk participation agreements, to buy or sell credit protection on specific interest rate swaps. It also purchases and sells forward foreign exchange contracts, either in connection with customer transactions, or for its own trading purposes. In 2015, the Company began an origination and sales program of certain personal real estate mortgages. Derivative instruments under this program include mortgage loan commitments, forward loan sale contracts, and forward contracts to sell certain to-be-announced (TBA) securities.

The Company has master netting arrangements with various counterparties but does not offset derivative assets and liabilities under these arrangements in its consolidated balance sheets. However, interest rate swaps that are executed under central clearing requirements are presented on a net basis as mandated by the statutory terms of the Company's contract with its clearing counterparty.

Additional information about derivatives held by the Company and valuation methods employed is provided in Note 15, Fair Value Measurements and Note 17, Derivative Instruments.

Pension Plan

The Company’s pension plan is described in Note 9, Employee Benefit Plans. The funded status of the plan is recognized as an asset or liability in the consolidated balance sheets, and changes in that funded status are recognized in the year in which the changes occur through other comprehensive income. Plan assets and benefit obligations are measured as of fiscal year end. The measurement of the projected benefit obligation and pension expense involve actuarial valuation methods and the use of various actuarial and economic assumptions. The Company monitors the assumptions and updates them periodically. Due to the long-term nature of the pension plan obligation, actual results may differ significantly from estimations. Such differences are adjusted over time as the assumptions are replaced by facts and values are recalculated.

Stock-Based Compensation

The Company’s stock-based employee compensation plan is described in Note 10, Stock-Based Compensation and Directors Stock Purchase Plan. In accordance with the requirements of ASC 718-10-30-3 and 35-2, the Company measures the cost of stock-based compensation based on the grant-date fair value of the award, recognizing the cost over the requisite service period, which is generally the vesting period. The fair value of an option award is estimated using the Black-Scholes option-pricing model while the fair value of a nonvested stock award is the common stock (CBSH) market price. The expense recognized is reduced for estimated forfeitures over the vesting period and adjusted for actual forfeitures as they occurred, and was included in salaries and employee benefits in the accompanying consolidated statements of income. As further discussed in Note 10, effective January 1, 2017, the Company recognized forfeitures as a reduction to expense only when they have occurred, as allowed under the provisions of ASU 2016-09.

Comprehensive Income

Comprehensive income includes all changes in stockholders’ equity during a period, except those resulting from transactions with stockholders. In addition to net income, other components of the Company’s comprehensive income include the after tax effect of changes in net unrealized gain / loss on securities available for sale and changes in net actuarial gain / loss on defined benefit post-retirement plans. Comprehensive income is reported in the accompanying consolidated statements of comprehensive income. See Note 11 for additional information on accumulated other comprehensive income (loss).

Treasury Stock

Purchases of the Company’s common stock are recorded at cost. Upon re-issuance for acquisitions, exercises of stock-based awards or other corporate purposes, treasury stock is reduced based upon the average cost basis of shares held.

Income per Share

Basic income per share is computed using the weighted average number of common shares outstanding during each year. Diluted income per share includes the effect of all dilutive potential common shares (primarily stock options and stock appreciation rights) outstanding during each year. The Company applies the two-class method of computing income per share. The two-class method is an earnings allocation formula that determines income per share for common stock and for participating securities, according to dividends declared and participation rights in undistributed earnings. The Company’s nonvested stock awards are considered to be a class of participating security. All per share data has been restated to reflect the 5% stock dividend distributed in December 2017.

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Loans And Allowance For Loan Losses

12 Months Ended

Dec. 31, 2017

Loans And Allowance For Loan Losses [Abstract]

Loans And Allowance For Loan Losses

Loans and Allowance for Loan Losses

Major classifications within the Company’s held for investment loan portfolio at December 31, 2017 and 2016 are as follows:

(In thousands)	2017		2016
Commercial:
Business	$	4,958,554	$	4,776,365
Real estate — construction and land	968,820		791,236
Real estate — business	2,697,452		2,643,374
Personal Banking:
Real estate — personal	2,062,787		2,010,397
Consumer	2,104,487		1,990,801
Revolving home equity	400,587		413,634
Consumer credit card	783,864		776,465
Overdrafts	7,123		10,464
Total loans	$	13,983,674	$	13,412,736

Loans to directors and executive officers of the Parent and the Bank, and to their associates, are summarized as follows:

(In thousands)
Balance at January 1, 2017	$	62,991
Additions	655,544
Amounts collected	(639,920		)
Amounts written off	—
Balance, December 31, 2017	$	78,615

Management believes all loans to directors and executive officers have been made in the ordinary course of business with normal credit terms, including interest rate and collateral considerations, and do not represent more than a normal risk of collection. The activity in the table above includes draws and repayments on several lines of credit with business entities. There were no outstanding loans at December 31, 2017 to principal holders (over 10% ownership) of the Company’s common stock.

The Company’s lending activity is generally centered in Missouri, Illinois, Kansas and other nearby states including Oklahoma, Colorado, Iowa, Ohio, Texas, and others. The Company maintains a diversified portfolio with limited industry concentrations of credit risk. Loans and loan commitments are extended under the Company’s normal credit standards, controls, and monitoring features. Most loan commitments are short or intermediate term in nature. Commercial loan maturities generally range from three to seven years. Collateral is commonly required and would include such assets as marketable securities and cash equivalent assets, accounts receivable and inventory, equipment, other forms of personal property, and real estate. At December 31, 2017, unfunded loan commitments totaled $10.8 billion (which included $5.1 billion in unused approved lines of credit related to credit card loan agreements) which could be drawn by customers subject to certain review and terms of agreement. At December 31, 2017, loans totaling $3.8 billion were pledged at the FHLB as collateral for borrowings and letters of credit obtained to secure public deposits. Additional loans of $1.7 billion were pledged at the Federal Reserve Bank as collateral for discount window borrowings.

The Company has a net investment in direct financing and sales type leases to commercial and industrial and tax-exempt entities of $737.7 million and $725.3 million at December 31, 2017 and 2016, respectively, which is included in business loans on the Company’s consolidated balance sheets. This investment includes deferred income of $52.1 million and $49.9 million at December 31, 2017 and 2016, respectively. The net investment in operating leases amounted to $17.4 million and $19.0 million at December 31, 2017 and 2016, respectively, and is included in other assets on the Company’s consolidated balance sheets.

Allowance for loan losses

A summary of the activity in the allowance for losses during the previous three years follows:

(In thousands)	Commercial			Personal Banking		Total
Balance at December 31, 2014	$	89,622		$	66,910	$	156,532
Provision for loan losses	(9,319		)	38,046		28,727
Deductions:
Loans charged off	4,057			46,993		51,050
Less recoveries	5,840			11,483		17,323
Net loans charged off (recoveries)	(1,783		)	35,510		33,727
Balance at December 31, 2015	82,086			69,446		151,532
Provision for loan losses	4,898			31,420		36,318
Deductions:
Loans charged off	3,258			47,720		50,978
Less recoveries	7,635			11,425		19,060
Net loans charged off (recoveries)	(4,377		)	36,295		31,918
Balance at December 31, 2016	91,361			64,571		155,932
Provision for loan losses	2,327			42,917		45,244
Deductions:
Loans charged off	2,538			52,641		55,179
Less recoveries	2,554			10,981		13,535
Net loans charged off (recoveries)	(16		)	41,660		41,644
Balance at December 31, 2017	$	93,704		$	65,828	$	159,532

The following table shows the balance in the allowance for loan losses and the related loan balance at December 31, 2017 and 2016, disaggregated on the basis of impairment methodology. Impaired loans evaluated under ASC 310-10-35 include loans on non-accrual status which are individually evaluated for impairment and other impaired loans deemed to have similar risk characteristics, which are collectively evaluated. All other loans are collectively evaluated for impairment under ASC 450-20.

	Impaired Loans				All Other Loans
(In thousands)	Allowance for Loan Losses		Loans Outstanding		Allowance for Loan Losses		Loans Outstanding
December 31, 2017
Commercial	$	3,067	$	92,613	$	90,637	$	8,532,213
Personal Banking	1,176		22,182		64,652		5,336,666
Total	$	4,243	$	114,795	$	155,289	$	13,868,879
December 31, 2016
Commercial	$	1,817	$	44,795	$	89,544	$	8,166,180
Personal Banking	1,292		19,737		63,279		5,182,024
Total	$	3,109	$	64,532	$	152,823	$	13,348,204

Impaired loans

The table below shows the Company’s investment in impaired loans at December 31, 2017 and 2016. These loans consist of all loans on non-accrual status and other restructured loans whose terms have been modified and classified as troubled debt restructurings under current accounting guidance. These restructured loans are performing in accordance with their modified terms, and because the Company believes it probable that all amounts due under the modified terms of the agreements will be collected, interest on these loans is being recognized on an accrual basis. They are discussed further in the "Troubled debt restructurings" section on page 78.

(In thousands)	2017		2016
Non-accrual loans	$	11,983	$	14,283
Restructured loans (accruing)	102,812		50,249
Total impaired loans	$	114,795	$	64,532

The following table provides additional information about impaired loans held by the Company at December 31, 2017 and 2016, segregated between loans for which an allowance for credit losses has been provided and loans for which no allowance has been provided.

(In thousands)	Recorded Investment		Unpaid Principal Balance		Related Allowance
December 31, 2017
With no related allowance recorded:
Business	$	5,356	$	9,000	$	—
Real estate – business	1,299		1,303		—
Consumer	779		817		—
	$	7,434	$	11,120	$	—
With an allowance recorded:
Business	$	72,589	$	73,168	$	2,455
Real estate – construction and land	837		841		27
Real estate – business	12,532		13,071		585
Real estate – personal	9,126		11,914		532
Consumer	5,388		5,426		67
Revolving home equity	204		204		11
Consumer credit card	6,685		6,685		566
	$	107,361	$	111,309	$	4,243
Total	$	114,795	$	122,429	$	4,243
December 31, 2016
With no related allowance recorded:
Business	$	7,375	$	10,470	$	—
Real estate – construction and land	557		752		—
	$	7,932	$	11,222	$	—
With an allowance recorded:
Business	$	29,924	$	31,795	$	1,318
Real estate – construction and land	69		72		3
Real estate – business	6,870		8,072		496
Real estate – personal	6,394		9,199		642
Consumer	5,281		5,281		57
Revolving home equity	584		584		1
Consumer credit card	7,478		7,478		592
	$	56,600	$	62,481	$	3,109
Total	$	64,532	$	73,703	$	3,109

Total average impaired loans during 2017 and 2016 are shown in the table below.

	2017						2016
(In thousands)	Commercial		Personal Banking		Total		Commercial		Personal Banking		Total
Average impaired loans:
Non-accrual loans	$	9,658	$	3,989	$	13,647	$	17,294	$	4,135	$	21,429
Restructured loans (accruing)	49,070		17,539		66,609		32,295		17,058		49,353
Total	$	58,728	$	21,528	$	80,256	$	49,589	$	21,193	$	70,782

The table below shows interest income recognized during the years ended December 31, 2017, 2016 and 2015 for impaired loans held at the end of each respective period. This interest relates to accruing restructured loans, as discussed previously.

	Years Ended December 31
(In thousands)	2017		2016		2015
Interest income recognized on impaired loans:
Business	$	3,135	$	1,064	$	495
Real estate – construction and land	41		2		80
Real estate – business	514		171		122
Real estate – personal	402		152		187
Consumer	307		339		348
Revolving home equity	10		31		20
Consumer credit card	673		722		750
Total	$	5,082	$	2,481	$	2,002

Delinquent and non-accrual loans

The following table provides aging information on the Company’s past due and accruing loans, in addition to the balances of loans on non-accrual status, at December 31, 2017 and 2016.

(In thousands)	Current or Less Than 30 Days Past Due		30 – 89 Days Past Due		90 Days Past Due and Still Accruing		Non-accrual		Total
December 31, 2017
Commercial:
Business	$	4,949,148	$	3,085	$	374	$	5,947	$	4,958,554
Real estate – construction and land	967,321		1,473		21		5		968,820
Real estate – business	2,694,234		482		—		2,736		2,697,452
Personal Banking:
Real estate – personal	2,050,787		6,218		3,321		2,461		2,062,787
Consumer	2,067,025		32,674		3,954		834		2,104,487
Revolving home equity	397,349		1,962		1,276		—		400,587
Consumer credit card	764,568		10,115		9,181		—		783,864
Overdrafts	6,840		283		—		—		7,123
Total	$	13,897,272	$	56,292	$	18,127	$	11,983	$	13,983,674
December 31, 2016
Commercial:
Business	$	4,763,274	$	3,735	$	674	$	8,682	$	4,776,365
Real estate – construction and land	789,633		1,039		—		564		791,236
Real estate – business	2,639,586		2,154		—		1,634		2,643,374
Personal Banking:
Real estate – personal	1,995,724		9,162		2,108		3,403		2,010,397
Consumer	1,957,358		29,783		3,660		—		1,990,801
Revolving home equity	411,483		1,032		1,119		—		413,634
Consumer credit card	757,443		10,187		8,835		—		776,465
Overdrafts	10,014		450		—		—		10,464
Total	$	13,324,515	$	57,542	$	16,396	$	14,283	$	13,412,736

Credit quality

The following table provides information about the credit quality of the Commercial loan portfolio, using the Company’s internal rating system as an indicator. The internal rating system is a series of grades reflecting management’s risk assessment, based on its analysis of the borrower’s financial condition. The “pass” category consists of a range of loan grades that reflect increasing, though still acceptable, risk. Movement of risk through the various grade levels in the “pass” category is monitored for early identification of credit deterioration. The “special mention” rating is attached to loans where the borrower exhibits material negative financial trends due to borrower specific or systemic conditions that, if left uncorrected, threaten its capacity to meet its debt obligations. The borrower is believed to have sufficient financial flexibility to react to and resolve its negative financial situation. It is a transitional grade that is closely monitored for improvement or deterioration. The “substandard” rating is applied to loans where the borrower exhibits well-defined weaknesses that jeopardize its continued performance and are of a severity that the distinct possibility of default exists. Loans are placed on “non-accrual” when management does not expect to collect payments consistent with acceptable and agreed upon terms of repayment, as discussed in Note 1.

	Commercial Loans
(In thousands)	Business		Real Estate -Construction		Real Estate - Business		Total
December 31, 2017
Pass	$	4,740,013	$	955,499	$	2,593,005	$	8,288,517
Special mention	59,177		10,614		50,577		120,368
Substandard	153,417		2,702		51,134		207,253
Non-accrual	5,947		5		2,736		8,688
Total	$	4,958,554	$	968,820	$	2,697,452	$	8,624,826
December 31, 2016
Pass	$	4,607,553	$	788,778	$	2,543,348	$	7,939,679
Special mention	116,642		722		45,479		162,843
Substandard	43,488		1,172		52,913		97,573
Non-accrual	8,682		564		1,634		10,880
Total	$	4,776,365	$	791,236	$	2,643,374	$	8,210,975

The credit quality of Personal Banking loans is monitored primarily on the basis of aging/delinquency, and this information is provided in the table in the above section on "Delinquent and non-accrual loans". In addition, FICO scores are obtained and updated on a quarterly basis for most of the loans in the Personal Banking portfolio. This is a published credit score designed to measure the risk of default by taking into account various factors from a person's financial history. The bank normally obtains a FICO score at the loan's origination and renewal dates, and updates are obtained on a quarterly basis. Excluded from the table below are certain personal real estate loans for which FICO scores are not obtained because the loans are related to commercial activity. These loans totaled $219.2 million at December 31, 2017 and $237.2 million at December 31, 2016. The table also excludes consumer loans related to the Company's patient healthcare loan program, which totaled $145.0 million at December 31, 2017 and $75.4 million at December 31, 2016. As the healthcare loans are guaranteed by the hospital, FICO scores are not considered relevant for this program. The personal real estate loans and consumer loans excluded below totaled less than 7% of the Personal Banking portfolio. For the remainder of loans in the Personal Banking portfolio, the table below shows the percentage of balances outstanding at December 31, 2017 and 2016 by FICO score.

	Personal Banking Loans
	% of Loan Category
	Real Estate - Personal		Consumer		Revolving Home Equity		Consumer Credit Card
December 31, 2017
FICO score:
Under 600	1.3	%	3.3	%	1.1	%	4.7	%
600 – 659	2.1		5.5		1.7		14.4
660 – 719	10.5		17.3		9.5		34.4
720 – 779	25.6		26.8		21.4		26.0
780 and over	60.5		47.1		66.3		20.5
Total	100.0	%	100.0	%	100.0	%	100.0	%
December 31, 2016
FICO score:
Under 600	1.3	%	3.4	%	1.0	%	4.9	%
600 – 659	2.6		6.4		1.8		15.5
660 – 719	10.4		19.7		9.7		34.9
720 – 779	25.4		26.3		21.1		25.1
780 and over	60.3		44.2		66.4		19.6
Total	100.0	%	100.0	%	100.0	%	100.0	%

Troubled debt restructurings

As mentioned previously, the Company's impaired loans include loans which have been classified as troubled debt restructurings. Restructured loans are those extended to borrowers who are experiencing financial difficulty and who have been granted a concession. Restructured loans are placed on non-accrual status if the Company does not believe it probable that amounts due under the contractual terms will be collected. Other performing restructured loans are comprised of certain business, construction and business real estate loans classified as substandard. Upon maturity, the loans renewed at interest rates judged not to be market rates for new debt with similar risk and as a result were classified as troubled debt restructurings. These loans are performing in accordance with their modified terms, and because the Company believes it probable that all amounts due under the modified terms of the agreements will be collected, interest on these loans is being recognized on an accrual basis. Performing restructured loans at rates judged to be below market increased $54.1 million at year end 2017 compared to year end 2016 due to several large loan renewals in 2017, including a single business loan of $31.9 million.

Troubled debt restructurings also include certain credit card loans under various debt management and assistance programs. Modifications to credit card loans generally involve removing the available line of credit, placing loans on amortizing status, and lowering the contractual interest rate. The Company also classified certain loans as troubled debt restructurings because they were not reaffirmed by the borrower in bankruptcy proceedings. These loans are comprised of personal real estate, revolving home equity and consumer loans. Interest on these loans is being recognized on an accrual basis, as the borrowers are continuing to make payments.

The table below summarizes the troubled debt restructurings outstanding by type of modification, as described above.

		December 31
(In thousands)		2017		2016
Accruing loans:
	Non-market interest rates	$	88,588	$	34,531
	Assistance programs	6,685		7,478
	Bankruptcy non-affirmation	7,283		7,937
	Other	256		303
Non-accrual loans		7,796		8,825
Total restructured loans		$	110,608	$	59,074

The table below shows the balance of troubled debt restructurings by loan classification at December 31, 2017, in addition to the period end balances of restructured loans which the Company considers to have been in default at any time during the past twelve months. For purposes of this disclosure, the Company considers "default" to mean 90 days or more past due as to interest or principal.

(In thousands)	December 31, 2017		Balance 90 days past due at any time during previous 12 months
Commercial:
Business	$	77,400	$	—
Real estate – construction and land	776		—
Real estate – business	12,394		—
Personal Banking:
Real estate – personal	7,760		278
Consumer	5,389		81
Revolving home equity	204		42
Consumer credit card	6,685		630
Total restructured loans	$	110,608	$	1,031

For those loans on non-accrual status also classified as restructured, the modification did not create any further financial effect on the Company as those loans were already recorded at net realizable value. For those performing commercial loans classified as restructured, there were no concessions involving forgiveness of principal or interest and, therefore, there was no financial impact to the Company as a result of modification to these loans. No financial impact resulted from those performing loans where the debt was not reaffirmed in bankruptcy, as no changes to loan terms occurred in that process. However, the effects of modifications to consumer credit card loans were estimated to decrease interest income by approximately $1.0 million on an annual, pre-tax basis, compared to amounts contractually owed.

The allowance for loan losses related to troubled debt restructurings on non-accrual status is determined by individual evaluation, including collateral adequacy, using the same process as loans on non-accrual status which are not classified as troubled debt restructurings. Those performing loans classified as troubled debt restructurings are accruing loans which management expects to collect under contractual terms. Performing commercial loans have had no other concessions granted other than being renewed at an interest rate judged not to be market. As such, they have similar risk characteristics as non-troubled debt commercial loans and are collectively evaluated based on internal risk rating, loan type, delinquency, historical experience and current economic factors. Performing personal banking loans classified as troubled debt restructurings resulted from the borrower not reaffirming the debt during bankruptcy and have had no other concession granted, other than the Bank's future limitations on collecting payment deficiencies or in pursuing foreclosure actions. As such, they have similar risk characteristics as non-troubled debt personal banking loans and are evaluated collectively based on loan type, delinquency, historical experience and current economic factors.

If a troubled debt restructuring defaults and is already on non-accrual status, the allowance for loan losses continues to be based on individual evaluation, using discounted expected cash flows or the fair value of collateral. If an accruing, troubled debt restructuring defaults, the loan's risk rating is downgraded to non-accrual status and the loan's related allowance for loan losses is determined based on individual evaluation, or if necessary, the loan is charged off and collection efforts begin.

The Company had commitments of $7.6 million at December 31, 2017 to lend additional funds to borrowers with restructured loans, compared to $10.3 million at December 31, 2016.

Loans held for sale

The Company designates certain long-term fixed rate personal real estate loan originations as held for sale, and the Company has elected the fair value option for these loans. The election of the fair value option aligns the accounting for these loans with the related economic hedges discussed in Note 17. The loans are primarily sold to FNMA, FHLMC, and GNMA. At December 31, 2017, the fair value of these loans was $15.3 million, and the unpaid principal balance was $14.8 million.

The Company also designates certain student loan originations as held for sale. The borrowers are credit-worthy students who are attending colleges and universities. The loans are intended to be sold in the secondary market, and the Company maintains contracts with Sallie Mae to sell the loans within 210 days after the last disbursement to the student. These loans are carried at lower of cost or fair value, which at December 31, 2017 totaled $6.1 million.

At December 31, 2017, none of the loans held for sale were past due or on non-accrual status.

Foreclosed real estate/repossessed assets

The Company’s holdings of foreclosed real estate totaled $681 thousand and $366 thousand at December 31, 2017 and 2016, respectively. Personal property acquired in repossession, generally autos and marine and recreational vehicles, totaled $2.7 million and $2.2 million at December 31, 2017 and 2016, respectively. Upon acquisition, these assets are recorded at fair value less estimated selling costs at the date of foreclosure, establishing a new cost basis. They are subsequently carried at the lower of this cost basis or fair value less estimated selling costs.

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Investment Securities

12 Months Ended

Dec. 31, 2017

Investments, Debt and Equity Securities [Abstract]

Investment Securities

Investment Securities

Investment securities, at fair value, consisted of the following at December 31, 2017 and 2016.

(In thousands)	2017		2016
Available for sale:
U.S. government and federal agency obligations	$	917,147	$	920,904
Government-sponsored enterprise obligations	406,363		449,998
State and municipal obligations	1,611,366		1,778,214
Agency mortgage-backed securities	3,040,913		2,685,931
Non-agency mortgage-backed securities	905,793		1,055,639
Asset-backed securities	1,492,800		2,381,301
Other debt securities	351,060		325,953
Equity securities	48,838		51,263
Total available for sale	8,774,280		9,649,203
Trading	18,269		22,225
Non-marketable	100,758		99,558
Total investment securities	$	8,893,307	$	9,770,986

Most of the Company’s investment securities are classified as available for sale, and this portfolio is discussed in more detail below. Securities which are classified as non-marketable include Federal Home Loan Bank (FHLB) stock and Federal Reserve Bank stock held for borrowing and regulatory purposes, which totaled $43.3 million and $46.9 million at December 31, 2017 and 2016, respectively. Investment in Federal Reserve Bank stock is based on the capital structure of the investing bank, and investment in FHLB stock is mainly tied to the level of borrowings from the FHLB. These holdings are carried at cost. Non-marketable securities also include private equity investments, which amounted to $57.2 million and $52.3 million at December 31, 2017 and 2016, respectively. In the absence of readily ascertainable market values, these securities are carried at estimated fair value.

A summary of the available for sale investment securities by maturity groupings as of December 31, 2017 is shown in the following table. The weighted average yield for each range of maturities was calculated using the yield on each security within that range weighted by the amortized cost of each security at December 31, 2017. Yields on tax exempt securities have not been adjusted for tax exempt status. The investment portfolio includes agency mortgage-backed securities, which are guaranteed by agencies such as FHLMC, FNMA, GNMA and FDIC, in addition to non-agency mortgage-backed securities which have no guarantee, but are collateralized by residential and commercial mortgages. Also included are certain other asset-backed securities, primarily collateralized by credit cards, automobiles and commercial loans. The Company does not have exposure to subprime-originated mortgage-backed or collateralized debt obligation instruments, and does not hold any trust preferred securities.

(Dollars in thousands)	Amortized Cost		Fair Value		Weighted Average Yield
U.S. government and federal agency obligations:
Within 1 year	$	57,983	$	58,347	1.71
After 1 but within 5 years	641,114		639,192		1.45
After 5 but within 10 years	149,589		149,927		.43
After 10 years	68,808		69,681		.59
Total U.S. government and federal agency obligations	917,494		917,147		1.24
Government-sponsored enterprise obligations:
Within 1 year	215,763		215,434		1.35
After 1 but within 5 years	121,575		121,199		1.93
After 5 but within 10 years	34,983		34,870		2.71
After 10 years	35,945		34,860		3.00
Total government-sponsored enterprise obligations	408,266		406,363		1.79
State and municipal obligations:
Within 1 year	164,756		165,638		2.65
After 1 but within 5 years	665,351		670,953		2.21
After 5 but within 10 years	709,248		721,181		2.46
After 10 years	53,352		53,594		3.01
Total state and municipal obligations	1,592,707		1,611,366		2.39
Mortgage and asset-backed securities:
Agency mortgage-backed securities	3,046,701		3,040,913		2.62
Non-agency mortgage-backed securities	903,920		905,793		2.54
Asset-backed securities	1,495,380		1,492,800		2.03
Total mortgage and asset-backed securities	5,446,001		5,439,506		2.45
Other debt securities:
Within 1 year	10,390		10,389
After 1 but within 5 years	247,181		247,626
After 5 but within 10 years	93,417		93,045
Total other debt securities	350,988		351,060
Equity securities	4,411		48,838
Total available for sale investment securities	$	8,719,867	$	8,774,280

* Rate does not reflect inflation adjustment on inflation-protected securities

Investments in U.S. government securities include U.S. Treasury inflation-protected securities, which totaled $442.1 million, at fair value, at December 31, 2017. Interest paid on these securities increases with inflation and decreases with deflation, as measured by the Consumer Price Index. At maturity, the principal paid is the greater of an inflation-adjusted principal or the original principal. Included in state and municipal obligations are $17.0 million, at fair value, of auction rate securities, which were purchased from bank customers in 2008. Interest on these bonds is currently being paid at the maximum failed auction rates. Equity securities are primarily comprised of investments in common stock held by the Parent, which totaled $45.9 million, at fair value, at December 31, 2017.

For securities classified as available for sale, the following table shows the unrealized gains and losses (pre-tax) in accumulated other comprehensive income, by security type.

(In thousands)	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
December 31, 2017
U.S. government and federal agency obligations	$	917,494	$	4,096	$	(4,443	)	$	917,147
Government-sponsored enterprise obligations	408,266		26		(1,929		)	406,363
State and municipal obligations	1,592,707		21,413		(2,754		)	1,611,366
Mortgage and asset-backed securities:
Agency mortgage-backed securities	3,046,701		17,956		(23,744		)	3,040,913
Non-agency mortgage-backed securities	903,920		6,710		(4,837		)	905,793
Asset-backed securities	1,495,380		2,657		(5,237		)	1,492,800
Total mortgage and asset-backed securities	5,446,001		27,323		(33,818		)	5,439,506
Other debt securities	350,988		1,250		(1,178		)	351,060
Equity securities	4,411		44,427		—			48,838
Total	$	8,719,867	$	98,535	$	(44,122	)	$	8,774,280
December 31, 2016
U.S. government and federal agency obligations	$	919,904	$	7,312	$	(6,312	)	$	920,904
Government-sponsored enterprise obligations	450,448		1,126		(1,576		)	449,998
State and municipal obligations	1,778,684		12,223		(12,693		)	1,778,214
Mortgage and asset-backed securities:
Agency mortgage-backed securities	2,674,964		31,610		(20,643		)	2,685,931
Non-agency mortgage-backed securities	1,054,446		7,686		(6,493		)	1,055,639
Asset-backed securities	2,389,176		3,338		(11,213		)	2,381,301
Total mortgage and asset-backed securities	6,118,586		42,634		(38,349		)	6,122,871
Other debt securities	327,030		935		(2,012		)	325,953
Equity securities	5,678		45,585		—			51,263
Total	$	9,600,330	$	109,815	$	(60,942	)	$	9,649,203

The Company’s impairment policy requires a review of all securities for which fair value is less than amortized cost. Special emphasis and analysis is placed on securities whose credit rating has fallen below Baa3 (Moody's) or BBB- (Standard & Poor's), whose fair values have fallen more than 20% below purchase price for an extended period of time, or have been identified based on management’s judgment. These securities are placed on a watch list, and for all such securities, detailed cash flow models are prepared which use inputs specific to each security. Inputs to these models include factors such as cash flow received, contractual payments required, and various other information related to the underlying collateral (including current delinquencies), collateral loss severity rates (including loan to values), expected delinquency rates, credit support from other tranches, and prepayment speeds. Stress tests are performed at varying levels of delinquency rates, prepayment speeds and loss severities in order to gauge probable ranges of credit loss. At December 31, 2017, the fair value of securities on this watch list was $68.0 million compared to $79.6 million at December 31, 2016.

As of December 31, 2017, the Company had recorded OTTI on certain non-agency mortgage-backed securities, part of the watch list mentioned above, which had an aggregate fair value of $26.2 million. The cumulative credit-related portion of the impairment on these securities, which was recorded in earnings, totaled $14.2 million. The Company does not intend to sell these securities and believes it is not likely that it will be required to sell the securities before the recovery of their amortized cost.

The credit-related portion of the loss on these securities was based on the cash flows projected to be received over the estimated life of the securities, discounted to present value, and compared to the current amortized cost bases of the securities. Significant inputs to the cash flow models used to calculate the credit losses on these securities included the following:

Significant Inputs	Range
Prepayment CPR	0%	-	25%
Projected cumulative default	14%	-	50%
Credit support	0%	-	54%
Loss severity	15%	-	63%

The following table presents a rollforward of the cumulative OTTI credit losses recognized in earnings on all available for sale debt securities.

(In thousands)	2017			2016			2015
Cumulative OTTI credit losses at January 1	$	14,080		$	14,129		$	13,734
Credit losses on debt securities for which impairment was not previously recognized	111			—			76
Credit losses on debt securities for which impairment was previously recognized	274			270			407
Increase in expected cash flows that are recognized over remaining life of security	(266		)	(319		)	(88		)
Cumulative OTTI credit losses at December 31	$	14,199		$	14,080		$	14,129

Securities with unrealized losses recorded in accumulated other comprehensive income are shown in the table below, along with the length of the impairment period.

	Less than 12 months				12 months or longer				Total
(In thousands)	Fair Value		Unrealized Losses		Fair Value		Unrealized Losses		Fair Value		Unrealized Losses
December 31, 2017
U.S. government and federal agency obligations	$	618,617	$	4,443	$	—	$	—	$	618,617	$	4,443
Government-sponsored enterprise obligations	286,393		1,712		49,766		217		336,159		1,929
State and municipal obligations	282,843		1,752		49,339		1,002		332,182		2,754
Mortgage and asset-backed securities:
Agency mortgage-backed securities	1,320,689		9,433		619,300		14,311		1,939,989		23,744
Non-agency mortgage-backed securities	577,017		2,966		153,813		1,871		730,830		4,837
Asset-backed securities	786,048		3,168		264,295		2,069		1,050,343		5,237
Total mortgage and asset-backed securities	2,683,754		15,567		1,037,408		18,251		3,721,162		33,818
Other debt securities	144,090		727		20,202		451		164,292		1,178
Total	$	4,015,697	$	24,201	$	1,156,715	$	19,921	$	5,172,412	$	44,122
December 31, 2016
U.S. government and federal agency obligations	$	349,538	$	2,823	$	32,208	$	3,489	$	381,746	$	6,312
Government-sponsored enterprise obligations	190,441		1,576		—		—		190,441		1,576
State and municipal obligations	700,779		12,164		15,195		529		715,974		12,693
Mortgage and asset-backed securities:
Agency mortgage-backed securities	1,147,416		20,638		2,150		5		1,149,566		20,643
Non-agency mortgage-backed securities	688,131		6,373		34,946		120		723,077		6,493
Asset-backed securities	780,209		5,277		358,778		5,936		1,138,987		11,213
Total mortgage and asset-backed securities	2,615,756		32,288		395,874		6,061		3,011,630		38,349
Other debt securities	179,639		1,986		975		26		180,614		2,012
Total	$	4,036,153	$	50,837	$	444,252	$	10,105	$	4,480,405	$	60,942

The total available for sale portfolio consisted of approximately 2,000 individual securities at December 31, 2017. The portfolio included 635 securities, having an aggregate fair value of $5.2 billion, that were in a loss position at December 31, 2017, compared to 771 securities, with a fair value of $4.5 billion, at December 31, 2016. The total amount of unrealized loss on these securities was $44.1 million at December 31, 2017, a decrease of $16.8 million compared to the loss at December 31, 2016. At December 31, 2017, the fair value of securities in an unrealized loss position for 12 months or longer totaled $1.2 billion, or 13.2% of the total portfolio value.

The Company’s holdings of state and municipal obligations included gross unrealized losses of $2.8 million at December 31, 2017. The state and municipal portfolio totaled $1.6 billion at fair value, or 18.4% of total available for sale securities. The portfolio is diversified in order to reduce risk, and the Company has processes and procedures in place to monitor its state and municipal holdings, identify signs of financial distress and, if necessary, exit its positions in a timely manner.

The credit ratings (Moody’s rating or equivalent) at December 31, 2017 in the state and municipal bond portfolio are shown in the following table. The average credit quality of the portfolio is Aa2 as rated by Moody’s.

	% of Portfolio
Aaa	6.0	%
Aa	76.9
A	16.4
Not rated	.7
	100.0	%

The following table presents proceeds from sales of securities and the components of investment securities gains and losses which have been recognized in earnings.

(In thousands)	2017			2016			2015
Proceeds from sales of available for sale securities	$	790,152		$	2,049		$	675,870
Proceeds from sales of non-marketable securities	2,228			22,331			13,161
Total proceeds	$	792,380		$	24,380		$	689,031
Available for sale:
Gains realized on sales	$	10,656		$	109		$	2,925
Losses realized on sales	(10,297		)	—			—
Losses realized on called bonds	(254		)	—			—
Gain realized on donation	31,074			—			—
Other-than-temporary impairment recognized on debt securities	(385		)	(270		)	(483		)
Non-marketable:
Gains realized on sales	970			4,349			2,516
Losses realized on sales	(880		)	(502		)	(40		)
Fair value adjustments, net	(5,833		)	(3,739		)	1,402
Investment securities gains (losses), net	$	25,051		$	(53	)	$	6,320

Investment securities with a fair value of $3.8 billion and $4.4 billion were pledged at December 31, 2017 and 2016, respectively, to secure public deposits, securities sold under repurchase agreements, trust funds, and borrowings at the Federal Reserve Bank. Securities pledged under agreements pursuant to which the collateral may be sold or re-pledged by the secured parties approximated $662.5 million, while the remaining securities were pledged under agreements pursuant to which the secured parties may not sell or re-pledge the collateral. Except for obligations of various government-sponsored enterprises such as FNMA, FHLB and FHLMC, no investment in a single issuer exceeds 10% of stockholders’ equity.

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Land, Buildings And Equipment

12 Months Ended

Dec. 31, 2017

Property, Plant and Equipment [Abstract]

Land, Buildings And Equipment

Land, Buildings and Equipment

Land, buildings and equipment consist of the following at December 31, 2017 and 2016:

(In thousands)	2017		2016
Land	$	94,992	$	98,221
Buildings and improvements	540,204		530,489
Equipment	216,876		258,030
Total	852,072		886,740
Less accumulated depreciation	516,962		549,035
Net land, buildings and equipment	$	335,110	$	337,705

Depreciation expense of $29.1 million in 2017 and $30.1 million in both 2016 and 2015, was included in occupancy expense and equipment expense in the consolidated statements of income. Repairs and maintenance expense of $16.4 million, $16.2 million and $16.3 million for 2017, 2016 and 2015, respectively, was included in occupancy expense and equipment expense. There has been no interest expense capitalized on construction projects in the past three years.

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Goodwill And Other Intangible Assets

12 Months Ended

Dec. 31, 2017

Goodwill and Intangible Assets Disclosure [Abstract]

Goodwill And Other Intangible Assets

Goodwill and Other Intangible Assets

The following table presents information about the Company's intangible assets which have estimable useful lives.

	December 31, 2017										December 31, 2016
(In thousands)	Gross Carrying Amount		Accumulated Amortization			Valuation Allowance			Net Amount		Gross Carrying Amount		Accumulated Amortization			Valuation Allowance			Net Amount
Amortizable intangible assets:
Core deposit premium	$	31,270	$	(28,305	)	$	—		$	2,965	$	31,270	$	(27,429	)	$	—		$	3,841
Mortgage servicing rights	7,906		(3,244		)	(9		)	4,653		5,672		(2,782		)	(22		)	2,868
Total	$	39,176	$	(31,549	)	$	(9	)	$	7,618	$	36,942	$	(30,211	)	$	(22	)	$	6,709

The carrying amount of goodwill and its allocation among segments at December 31, 2017 and 2016 is shown in the table below. As a result of ongoing assessments, no impairment of goodwill was recorded in 2017, 2016 or 2015. Further, the annual assessment of qualitative factors on January 1, 2018 revealed no likelihood of impairment as of that date.

(In thousands)	December 31, 2017		December 31, 2016
Consumer segment	$	70,721	$	70,721
Commercial segment	67,454		67,454
Wealth segment	746		746
Total goodwill	$	138,921	$	138,921

Changes in the net carrying amount of goodwill and other net intangible assets for the years ended December 31, 2017 and 2016 are shown in the following table.

(In thousands)	Goodwill		Core Deposit Premium			Mortgage Servicing Rights
Balance at December 31, 2015	$	138,921	$	5,031		$	1,638
Originations	—		—			1,539
Amortization	—		(1,190		)	(316		)
Impairment reversal	—		—			7
Balance at December 31, 2016	138,921		3,841			2,868
Originations	—		—			2,234
Amortization	—		(876		)	(462		)
Impairment reversal	—		—			13
Balance at December 31, 2017	$	138,921	$	2,965		$	4,653

Mortgage servicing rights (MSRs) are initially recorded at fair value and subsequently amortized over the period of estimated servicing income. They are periodically reviewed for impairment and if impairment is indicated, recorded at fair value. At December 31, 2017, temporary impairment of $9 thousand had been recognized. Temporary impairment, including impairment recovery, is effected through a change in a valuation allowance. The fair value of the MSRs is based on the present value of expected future cash flows, as further discussed in Note 15 on Fair Value Measurements.

Aggregate amortization expense on intangible assets for the years ended December 31, 2017, 2016 and 2015 was $1.3 million, $1.5 million and $1.8 million, respectively. The following table shows the estimated future amortization expense based on existing asset balances and the interest rate environment as of December 31, 2017. The Company’s actual amortization expense in any given period may be different from the estimated amounts depending upon the acquisition of intangible assets, changes in mortgage interest rates, prepayment rates and other market conditions.

(In thousands)
2018	$	1,213
2019	1,038
2020	878
2021	753
2022	653

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Deposits

12 Months Ended

Dec. 31, 2017

Deposits [Abstract]

Deposits

Deposits

At December 31, 2017, the scheduled maturities of total time open and certificates of deposit were as follows:

(In thousands)
Due in 2018	$	1,414,554
Due in 2019	217,562
Due in 2020	73,192
Due in 2021	41,313
Due in 2022	18,191
Thereafter	2,052
Total	$	1,766,864

The following table shows a detailed breakdown of the maturities of time open and certificates of deposit, by size category, at December 31, 2017.

(In thousands)	Certificates of Deposit under $100,000		Other Time Deposits under $100,000		Certificates of Deposit over $100,000		Other Time Deposits over $100,000		Total
Due in 3 months or less	$	115,126	$	24,019	$	484,168	$	3,744	$	627,057
Due in over 3 through 6 months	115,595		26,607		197,173		5,438		344,813
Due in over 6 through 12 months	180,447		36,573		216,459		9,205		442,684
Due in over 12 months	82,789		53,490		205,085		10,946		352,310
Total	$	493,957	$	140,689	$	1,102,885	$	29,333	$	1,766,864

The aggregate amount of time open and certificates of deposit that exceeded the $250,000 FDIC insurance limit totaled $880.9 million at December 31, 2017.

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Borrowings

12 Months Ended

Dec. 31, 2017

Debt Disclosure [Abstract]

Borrowings

Borrowings

The following table sets forth selected information for short-term borrowings (borrowings with an original maturity of less than one year).

(Dollars in thousands)	Year End Weighted Rate		Average Weighted Rate		Average Balance Outstanding		Maximum Outstanding at any Month End		Balance at December 31
Federal funds purchased and repurchase agreements:
2017	.8	%	.7	%	$	1,462,387	$	1,984,071	$	1,507,138
2016	.4		.3		1,266,093		1,723,905		1,723,905
2015	.2		.1		1,654,860		2,193,197		1,963,552

Short-term borrowings consist primarily of federal funds purchased and securities sold under agreements to repurchase (repurchase agreements), which generally have one day maturities. At December 31, 2017, $1.3 billion of these borrowings were short-term repurchase agreements comprised of non-insured customer funds, which were secured by a portion of the Company's investment portfolio. Additional information about the securities pledged for repurchase agreements is provided in Note 18 on Resale and Repurchase Agreements.

The Bank is a member of the Des Moines FHLB and has access to term financing from the FHLB. These borrowings are secured under a blanket collateral agreement including primarily residential mortgages as well as all unencumbered assets and stock of the borrowing bank. In November 2017, the Bank repaid its remaining borrowings from the FHLB, which totaled $100.0 million. The FHLB also issues letters of credit to secure the Bank's obligations to certain depositors of public funds, which totaled $498.4 million at December 31, 2017. At December 31, 2017, the Bank had no outstanding advances from the FHLB, and its remaining outstanding debt, totaling $1.8 million, relates to leasing activities.

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Income Taxes

12 Months Ended

Dec. 31, 2017

Income Tax Disclosure [Abstract]

Income Taxes

Income Taxes

The components of income tax expense from operations for the years ended December 31, 2017, 2016 and 2015 were as follows:

(In thousands)	Current		Deferred			Total
Year ended December 31, 2017:
U.S. federal	$	89,154	$	12,190		$	101,344
State and local	7,735		1,427			9,162
Total	$	96,889	$	13,617		$	110,506
Year ended December 31, 2016:
U.S. federal	$	116,753	$	(2,036	)	$	114,717
State and local	9,457		(23		)	9,434
Total	$	126,210	$	(2,059	)	$	124,151
Year ended December 31, 2015:
U.S. federal	$	102,607	$	7,084		$	109,691
State and local	6,551		348			6,899
Total	$	109,158	$	7,432		$	116,590

The components of income tax (benefit) expense recorded directly to stockholders’ equity for the years ended December 31, 2017, 2016 and 2015 were as follows:

(In thousands)	2017			2016			2015
Unrealized gain (loss) on securities available for sale	$	2,104		$	(13,952	)	$	(19,634	)
Accumulated pension (benefit) loss	(184		)	778			1,478
Compensation expense for tax purposes in excess of amounts recognized for financial reporting purposes	—			(3,390		)	(2,132		)
Income tax (benefit) expense allocated to stockholders’ equity	$	1,920		$	(16,564	)	$	(20,288	)

Significant components of the Company’s deferred tax assets and liabilities at December 31, 2017 and 2016 were as follows:

(In thousands)	2017			2016
Deferred tax assets:
Loans, principally due to allowance for loan losses	$	40,341		$	61,233
Equity-based compensation	8,201			12,633
Deferred compensation	5,647			7,998
Private equity investments	5,473			9,667
Accrued expenses	5,245			16,638
Unearned fee income	3,701			3,819
Other	4,430			6,071
Total deferred tax assets	73,038			118,059
Deferred tax liabilities:
Equipment lease financing	45,825			71,355
Unrealized gain on securities available for sale	13,603			18,572
Land, buildings and equipment	8,592			10,375
Undistributed earnings of subsidiaries	7,094			23
Intangibles	5,732			9,105
Other	6,569			8,765
Total deferred tax liabilities	87,415			118,195
Net deferred tax liabilities	$	(14,377	)	$	(136	)

Management believes it is more likely than not that the results of future operations will generate sufficient taxable income to realize the total deferred tax assets.

As a result of the Tax Cuts and Jobs Act enacted on December 22, 2017, the Company revalued its deferred tax assets and liabilities using the highest maximum corporate tax rate of 21%. This change was reported as a reduction of deferred tax expense. The Company also adopted ASU 2016-09, "Improvements to Employee Share-Based Payment Accounting," on January 1, 2017. This adoption requires all excess tax benefits and tax deficiencies arising from share-based award payments to be recognized as income tax expense or benefit in the statements of income, while in previous periods these benefits and deficiencies were recognized in equity. In 2017, net excess tax benefits resulted from share-based award payments. The effects on federal tax expense of both of these items are shown in the reconciliation below.

A reconciliation between the expected federal income tax expense using the federal statutory tax rate of 35% and the Company’s actual income tax expense for 2017, 2016 and 2015 is provided in the table below. The effective tax rate is calculated by dividing income taxes by income before income taxes less the non-controlling interest expense.

(In thousands)	2017			2016			2015
Computed “expected” tax expense	$	150,461		$	139,840		$	133,112
Increase (decrease) in income taxes resulting from:
Tax-exempt interest, net of cost to carry	(20,295		)	(20,033		)	(19,083		)
Contribution of appreciated securities	(10,864		)	—			—
Tax reform enactment	(6,753		)	—			—
Share-based award payments	(6,613		)	—			—
State and local income taxes, net of federal tax benefit	5,955			6,132			4,484
Tax deductible dividends on allocated shares held by the Company’s ESOP	(966		)	(1,044		)	(1,093		)
Other	(419		)	(744		)	(830		)
Total income tax expense	$	110,506		$	124,151		$	116,590

The gross amount of unrecognized tax benefits was $1.2 million at both December 31, 2017 and 2016, and the total amount of unrecognized tax benefits that would impact the effective tax rate, if recognized, was $785 thousand and $798 thousand, respectively. The activity in the accrued liability for unrecognized tax benefits for the years ended December 31, 2017 and 2016 was as follows:

(In thousands)	2017			2016
Unrecognized tax benefits at beginning of year	$	1,228		$	1,278
Gross increases – tax positions in prior period	5			—
Gross decreases – tax positions in prior period	—			(1		)
Gross increases – current-period tax positions	268			269
Lapse of statute of limitations	(293		)	(318		)
Unrecognized tax benefits at end of year	$	1,208		$	1,228

The Company and its subsidiaries are subject to income tax by federal, state and local government taxing authorities. Tax years 2014 through 2017 remain open to examination for U.S. federal income tax as well as income tax in major state taxing jurisdictions.

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Employee Benefit Plans

12 Months Ended

Dec. 31, 2017

Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract]

Employee Benefit Plans

Employee Benefit Plans

Employee benefits charged to operating expenses are summarized in the table below. Substantially all of the Company’s employees are covered by a defined contribution (401(k)) plan, under which the Company makes matching contributions.

(In thousands)	2017		2016		2015
Payroll taxes	$	24,402	$	23,210	$	22,235
Medical plans	25,143		25,497		20,659
401(k) plan	14,244		13,562		12,841
Pension plans	704		987		1,495
Other	2,883		3,214		2,950
Total employee benefits	$	67,376	$	66,470	$	60,180

A portion of the Company’s employees are covered by a noncontributory defined benefit pension plan, however, participation in the pension plan is not available to employees hired after June 30, 2003. All participants are fully vested in their benefit payable upon normal retirement date, which is based on years of participation and compensation. Certain key executives also participate in a supplemental executive retirement plan (the CERP) that the Company funds only as retirement benefits are disbursed. The CERP carries no segregated assets. Since January 2011, all benefits accrued under the pension plan have been frozen. However, the accounts continue to accrue interest at a stated annual rate. The CERP continues to provide credits based on hypothetical contributions in excess of those permitted under the 401(k) plan. In the tables presented below, the pension plan and the CERP are presented on a combined basis.

Under the Company’s funding policy for the defined benefit pension plan, contributions are made to a trust as necessary to satisfy the statutory minimum required contribution as defined by the Pension Protection Act, which is intended to provide for current service accruals and for any unfunded accrued actuarial liabilities over a reasonable period. To the extent that these requirements are fully covered by assets in the trust, a contribution might not be made in a particular year. No contributions to the defined benefit plan were made in 2016. The Company made a discretionary contribution of $5.5 million to its defined benefit pension plan in 2017 in order to reduce pension guarantee premiums. The minimum required contribution for 2018 is expected to be zero. The Company does not expect to make any further contributions in 2018 other than the necessary funding contributions to the CERP. Contributions to the CERP were $439 thousand, $21 thousand and $20 thousand during 2017, 2016 and 2015, respectively.

The following items are components of the net pension cost for the years ended December 31, 2017, 2016 and 2015.

(In thousands)	2017			2016			2015
Service cost-benefits earned during the year	$	621		$	500		$	503
Interest cost on projected benefit obligation	3,826			3,944			4,762
Expected return on plan assets	(5,785		)	(5,751		)	(6,092		)
Amortization of prior service cost	(271		)	(271		)	(271		)
Amortization of unrecognized net loss	2,313			2,565			2,593
Net periodic pension cost	$	704		$	987		$	1,495

The following table sets forth the pension plans’ funded status, using valuation dates of December 31, 2017 and 2016.

(In thousands)	2017			2016
Change in projected benefit obligation
Projected benefit obligation at prior valuation date	$	116,695		$	117,562
Service cost	621			500
Interest cost	3,826			3,944
Benefits paid	(6,780		)	(6,322		)
Actuarial (gain) loss	6,305			1,011
Projected benefit obligation at valuation date	120,667			116,695
Change in plan assets
Fair value of plan assets at prior valuation date	99,537			99,325
Actual return on plan assets	9,564			6,513
Employer contributions	5,939			21
Benefits paid	(6,780		)	(6,322		)
Fair value of plan assets at valuation date	108,260			99,537
Funded status and net amount recognized at valuation date	$	(12,407	)	$	(17,158	)

The accumulated benefit obligation, which represents the liability of a plan using only benefits as of the measurement date, was $120.7 million and $116.7 million for the combined plans on December 31, 2017 and 2016, respectively.

Amounts not yet reflected in net periodic benefit cost and included in accumulated other comprehensive income (loss) at December 31, 2017 and 2016 are shown below, including amounts recognized in other comprehensive income during the periods. All amounts are shown on a pre-tax basis.

(In thousands)	2017			2016
Prior service cost	$	1,806		$	2,077
Accumulated loss	(33,499		)	(33,285		)
Accumulated other comprehensive loss	(31,693		)	(31,208		)
Cumulative employer contributions in excess of net periodic benefit cost	19,286			14,050
Net amount recognized as an accrued benefit liability on the December 31 balance sheet	$	(12,407	)	$	(17,158	)
Net loss arising during period	(2,527		)	(248		)
Amortization of net loss	2,313			2,565
Amortization of prior service cost	(271		)	(271		)
Total recognized in other comprehensive income	$	(485	)	$	2,046
Total income (expense) recognized in net periodic pension cost and other comprehensive income	$	(1,189	)	$	1,059

The estimated net loss and prior service cost to be amortized from accumulated other comprehensive income into net periodic pension cost in 2018 is $2.1 million.

The following assumptions, on a weighted average basis, were used in accounting for the plans.

	2017		2016		2015
Determination of benefit obligation at year end:
Effective discount rate for benefit obligations	3.57	%	4.05	%	4.15	%
Assumed credit on cash balance accounts	5.00	%	5.00	%	5.00	%
Determination of net periodic benefit cost for year ended:
Effective discount rate for benefit obligations	3.95	%	4.16	%	3.95	%
Effective rate for interest on benefit obligations	3.28	%	3.38	%	NA
Long-term rate of return on assets	6.00	%	6.00	%	6.00	%
Assumed credit on cash balance accounts	5.00	%	5.00	%	5.00	%

The following table shows the fair values of the Company’s pension plan assets by asset category at December 31, 2017 and 2016. Information about the valuation techniques and inputs used to measure fair value are provided in Note 15 on Fair Value Measurements.

			Fair Value Measurements
(In thousands)	Total Fair Value		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
December 31, 2017
Assets:
U.S. government obligations	$	3,719	$	3,719	$	—	$	—
Government-sponsored enterprise obligations (a)	1,282		—		1,282		—
State and municipal obligations	8,527		—		8,527		—
Agency mortgage-backed securities (b)	7,896		—		7,896		—
Non-agency mortgage-backed securities	4,891		—		4,891		—
Asset-backed securities	3,833		—		3,833		—
Corporate bonds (c)	37,457		—		37,457		—
Equity securities and mutual funds: (d)
Mutual funds	6,979		6,979		—		—
Common stocks	23,744		23,744		—		—
International developed markets funds	7,870		7,870		—		—
Emerging markets funds	2,062		2,062		—		—
Total	$	108,260	$	44,374	$	63,886	$	—
December 31, 2016
Assets:
U.S. government obligations	$	3,621	$	3,621	$	—	$	—
Government-sponsored enterprise obligations (a)	1,215		—		1,215		—
State and municipal obligations	9,148		—		9,148		—
Agency mortgage-backed securities (b)	4,073		—		4,073		—
Non-agency mortgage-backed securities	5,437		—		5,437		—
Asset-backed securities	5,275		—		5,275		—
Corporate bonds (c)	34,037		—		34,037		—
Equity securities and mutual funds: (d)
Mutual funds	10,393		10,393		—		—
Common stocks	20,141		20,141		—		—
International developed markets funds	5,100		5,100		—		—
Emerging markets funds	1,097		1,097		—		—
Total	$	99,537	$	40,352	$	59,185	$	—

(a) This category represents bonds (excluding mortgage-backed securities) issued by agencies such as the Federal Home Loan Bank, the Federal Home Loan Mortgage Corp and the Federal National Mortgage Association.

(b) This category represents mortgage-backed securities issued by the agencies mentioned in (a).

(c) This category represents investment grade bonds issued in the U.S., primarily by domestic issuers, representing diverse industries.

(d) This category represents investments in individual common stocks and equity funds. These holdings are diversified, largely across the financial services, consumer goods, healthcare, electronic technology and technology services industries.

The investment policy of the pension plan is designed for growth in principal, within limits designed to safeguard against significant losses within the portfolio. The policy sets guidelines, which may change from time to time, regarding the types and percentages of investments held. Currently, the policy includes guidelines such as holding bonds rated investment grade or better and prohibiting investment in Company stock. The plan does not utilize derivatives. Management believes there are no significant concentrations of risk within the plan asset portfolio at December 31, 2017. Under the current policy, the long-term investment target mix for the plan is 35% equity securities and 65% fixed income securities. The Company regularly reviews its policies on investment mix and may make changes depending on economic conditions and perceived investment risk.

Effective January 1, 2016, the Company changed the method used to estimate the interest cost component of net periodic pension cost for its defined benefit pension plan. Prior to the change, the interest cost component was estimated by utilizing a single weighted average discount rate derived from the yield curve used to measure the projected benefit obligation. Under the new method, the interest cost component is estimated by applying the specific annual spot rates along the yield curve used in the determination of the projected benefit obligation to the relevant projected cash flows. This change provides a more precise measurement of the interest cost by improving the correlation between projected benefit cash flows and the corresponding spot yield curve rates. The Company accounted for this change prospectively as a change in accounting estimate. The change resulted in a decrease of approximately $900 thousand in the interest cost component of the estimated annual net periodic pension cost for 2016.

The assumed overall expected long-term rate of return on pension plan assets used in calculating 2017 pension plan expense was 6.0%. Determination of the plan’s expected rate of return is based upon historical and anticipated returns of the asset classes invested in by the pension plan and the allocation strategy currently in place among those classes. The rate used in plan calculations may be adjusted by management for current trends in the economic environment. The 10-year annualized return for the Company’s pension plan was 6.3%. During 2017, the plan’s rate of return was 9.6%, compared to 7.2% in 2016. Returns for any plan year may be affected by changes in the stock market and interest rates. The Company expects to incur pension expense of $761 thousand in 2018, compared to $704 thousand in 2017.

The Company utilizes mortality tables published by the Society of Actuaries to incorporate mortality assumptions into the measurement of the pension benefit obligation. At December 31, 2017, the Company utilized an updated mortality projection scale and recently finalized mortality tables. In addition, various other assumptions were changed as the result of a recent experience study. The combined effect of all assumption changes decreased the pension benefit obligation on that date by approximately $300 thousand.

The following future benefit payments are expected to be paid:

(In thousands)
2018	$	7,133
2019	7,231
2020	7,413
2021	7,534
2022	7,473
2023 - 2027	37,421

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Stock-Based Compensation and Directors Stock Purchase Plan

12 Months Ended

Dec. 31, 2017

Share-based Compensation [Abstract]

Stock-Based Compensation

Stock-Based Compensation and Directors Stock Purchase Plan*

The Company’s stock-based compensation is provided under a stockholder-approved plan which allows for issuance of various types of awards, including stock options, stock appreciation rights, restricted stock and restricted stock units, performance awards and stock-based awards. During the past three years, stock-based compensation has been issued in the form of nonvested stock awards and stock appreciation rights. At December 31, 2017, 2,776,076 shares remained available for issuance under the plan. The stock-based compensation expense that was charged against income was $12.1 million, $11.5 million and $10.1 million for the years ended December 31, 2017, 2016 and 2015, respectively. The total income tax benefit recognized in the income statement for share-based compensation arrangements was $4.5 million, $4.3 million and $3.8 million for the years ended December 31, 2017, 2016 and 2015, respectively.

The Company adopted ASU 2016-09, "Improvements to Employee Share-Based Payment Accounting," on January 1, 2017. The Company elected to change its method of accounting for forfeitures, as allowed by this guidance. In 2016 and prior years, accruals of compensation cost were reduced by an estimate of awards not expected to vest and further adjusted when actual forfeitures occurred. In 2017 and subsequent years, forfeitures will be accounted for when they occur and recognized in compensation cost at that time. The effect of this change, which was recognized as a cumulative-effect adjustment on January 1, 2017, increased equity and increased deferred tax assets by approximately $1.3 million.

Nonvested Restricted Stock Awards

Nonvested stock is awarded to key employees by action of the Company's Compensation and Human Resources Committee and Board of Directors. These awards generally vest after 4 to 7 years of continued employment, but vesting terms may vary according to the specifics of the individual grant agreement. There are restrictions as to transferability, sale, pledging, or assigning, among others, prior to the end of the vesting period. Dividend and voting rights are conferred upon grant of restricted stock awards. A summary of the status of the Company’s nonvested share awards as of December 31, 2017 and changes during the year then ended is presented below.

	Shares		Weighted Average Grant Date Fair Value
Nonvested at January 1, 2017	1,461,713		$	33.02
Granted	263,123		54.56
Vested	(442,435	)	29.41
Forfeited	(27,883	)	39.12
Canceled	—		—
Nonvested at December 31, 2017	1,254,518		$	38.67

The total fair value (at vest date) of shares vested during 2017, 2016 and 2015 was $23.8 million, $10.9 million and $6.0 million, respectively.

Stock Appreciation Rights

Stock appreciation rights (SARs) are granted with exercise prices equal to the market price of the Company’s stock at the date of grant. SARs vest ratably over four years of continuous service and have 10-year contractual terms. All SARs must be settled in stock under provisions of the plan. A summary of SAR activity during 2017 is presented below.

(Dollars in thousands, except per share data)	Shares		Weighted Average Exercise Price		Weighted Average Remaining Contractual Term		Aggregate Intrinsic Value
Outstanding at January 1, 2017	1,390,782		$	32.89
Granted	173,740		54.79
Forfeited	(13,325	)	42.19
Expired	(878	)	34.75
Exercised	(371,033	)	29.30
Outstanding at December 31, 2017	1,179,286		$	37.13	6.2	years	$	22,073
Exercisable at December 31, 2017	630,135		$	32.60	4.6	years	$	14,645

In determining compensation cost, the Black-Scholes option-pricing model is used to estimate the fair value of SARs on date of grant. The Black-Scholes model is a closed-end model that uses various assumptions as shown in the following table. Expected volatility is based on historical volatility of the Company’s stock. The Company uses historical exercise behavior and other factors to estimate the expected term of the SARs, which represents the period of time that the SARs granted are expected to be outstanding. The risk-free rate for the expected term is based on the U.S. Treasury zero coupon spot rates in effect at the time of grant. The per share average fair value and the model assumptions for SARs granted during the past three years are shown in the table below.

	2017			2016			2015
Weighted per share average fair value at grant date		$11.94			$6.79			$6.55
Assumptions:
Dividend yield	1.6		%	2.2		%	2.2		%
Volatility	21.1		%	21.2		%	21.3		%
Risk-free interest rate	2.4		%	1.8		%	1.8		%
Expected term	7.0 years			7.2 years			7.2 years

Additional information about stock options and SARs exercised is presented below.

(In thousands)	2017		2016		2015
Intrinsic value of options and SARs exercised	$	9,310	$	8,854	$	7,541
Cash received from options and SARs exercised	$	—	$	—	$	1,914
Tax benefit realized from options and SARs exercised	$	2,698	$	1,781	$	1,041

As of December 31, 2017, there was $24.0 million of unrecognized compensation cost related to unvested SARs and stock awards. This cost is expected to be recognized over a weighted average period of approximately 3.0 years.

Directors Stock Purchase Plan

The Company has a directors stock purchase plan whereby outside directors of the Company and its subsidiaries may elect to use their directors’ fees to purchase Company stock at market value each month end. Remaining shares available for issuance under this plan were 80,377 at December 31, 2017. In 2017, 15,873 shares were purchased at an average price of $54.55, and in 2016, 21,568 shares were purchased at an average price of $42.50.

* All share and per share amounts in this note have been restated for the 5% common stock dividend distributed in 2017.

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Accumulated Other Comprehensive Income

12 Months Ended

Dec. 31, 2017

Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]

Accumulated Other Comprehensive Income

Accumulated Other Comprehensive Income

The table below shows the activity and accumulated balances for components of other comprehensive income. The largest component is the unrealized holding gains and losses on available for sale securities. Unrealized gains and losses on debt securities for which an other-than-temporary impairment (OTTI) has been recorded in current earnings are shown separately below. The other component is amortization from other comprehensive income of losses associated with pension benefits, which occurs as the amortization is included in current net periodic benefit cost.

	Unrealized Gains (Losses) on Securities (1)						Pension Loss (2)			Total Accumulated Other Comprehensive Income
(In thousands)	OTTI			Other
Balance January 1, 2017	$	2,975		$	27,328		$	(19,328	)		$	10,975
Other comprehensive income (loss) before reclassifications	279			36,307			(2,527		)		34,059
Amounts reclassified from accumulated other comprehensive income	385			(31,433		)	2,042				(29,006		)
Current period other comprehensive income (loss), before tax	664			4,874			(485		)		5,053
Income tax (expense) benefit	(252		)	(1,852		)	184				(1,920		)
Current period other comprehensive income (loss), net of tax	412			3,022			(301		)		3,133
Transfer of unrealized gain on securities for which impairment was not previously recognized	24			(24		)	—				—
Balance December 31, 2017	$	3,411		$	30,326		$	(19,629	)		$	14,108
Balance January 1, 2016	$	3,316		$	49,750		$	(20,596	)		$	32,470
Other comprehensive loss before reclassifications	(820		)	(36,057		)	(248		)		(37,125		)
Amounts reclassified from accumulated other comprehensive income	270			(108		)	2,294				2,456
Current period other comprehensive income (loss), before tax	(550		)	(36,165		)	2,046				(34,669		)
Income tax (expense) benefit	209			13,743			(778		)		13,174
Current period other comprehensive income (loss), net of tax	(341		)	(22,422		)	1,268				(21,495		)
Balance December 31, 2016	$	2,975		$	27,328		$	(19,328	)		$	10,975

(1) The pre-tax amounts reclassified from accumulated other comprehensive income are included in "investment securities gains (losses), net" in the consolidated statements of income.

(2) The pre-tax amounts reclassified from accumulated other comprehensive income are included in the computation of net periodic pension cost as "amortization of prior service cost" and "amortization of unrecognized net loss" (see Note 9), for inclusion in the consolidated statements of income.

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Segments

12 Months Ended

Dec. 31, 2017

Segment Reporting [Abstract]

Segments

Segments

The Company segregates financial information for use in assessing its performance and allocating resources among three operating segments: Consumer, Commercial and Wealth. The Consumer segment includes the consumer portion of the retail branch network (loans, deposits and other personal banking services), indirect and other consumer financing, and consumer debit and credit card loan and fee businesses. Residential mortgage origination, sales and servicing functions are included in this consumer segment, but residential mortgage loans retained by the Company are not considered part of this segment. The Commercial segment provides corporate lending (including the Small Business Banking product line within the branch network), leasing, international services, and business, government deposit, and related commercial cash management services, as well as merchant and commercial bank card products. The Commercial segment also includes the Capital Markets Group, which sells fixed income securities and provides investment safekeeping and bond accounting services. The Wealth segment provides traditional trust and estate planning, advisory and discretionary investment management, and brokerage services. This segment also provides various loan and deposit related services to its private banking customers.

The Company’s business line reporting system derives segment information from the internal profitability reporting system used by management to monitor and manage the financial performance of the Company. This information is based on internal management accounting procedures and methods, which have been developed to reflect the underlying economics of the businesses. These methodologies are applied in connection with funds transfer pricing and assignment of overhead costs among segments. Funds transfer pricing was used in the determination of net interest income by assigning a standard cost (credit) for funds used (provided) by assets and liabilities based on their maturity, prepayment and/or repricing characteristics. Income and expense that directly relate to segment operations are recorded in the segment when incurred. Expenses that indirectly support the segments are allocated based on the most appropriate method available.

The Company uses a funds transfer pricing method to value funds used (e.g., loans, fixed assets, and cash) and funds provided (e.g., deposits, borrowings, and equity) by the business segments and their components. This process assigns a specific value to each new source or use of funds with a maturity, based on current swap rates, thus determining an interest spread at the time of the transaction. Non-maturity assets and liabilities are valued using weighted average pools. The funds transfer pricing process attempts to remove interest rate risk from valuation, allowing management to compare profitability under various rate environments.

The following tables present selected financial information by segment and reconciliations of combined segment totals to consolidated totals. There were no material intersegment revenues between the three segments. Management periodically makes changes to methods of assigning costs and income to its business segments to better reflect operating results. If appropriate, these changes are reflected in prior year information presented below.

Segment Income Statement Data

(In thousands)	Consumer			Commercial			Wealth			Segment Totals			Other/Elimination			Consolidated Totals
Year ended December 31, 2017:
Net interest income	$	279,031		$	328,345		$	47,264		$	654,640		$	79,039		$	733,679
Provision for loan losses	(41,829		)	205			(41		)	(41,665		)	(3,579		)	(45,244		)
Non-interest income	136,554			194,581			158,175			489,310			(2,706		)	486,604
Investment securities gains, net	—			—			—			—			25,051			25,051
Non-interest expense	(290,905		)	(290,874		)	(120,458		)	(702,237		)	(67,447		)	(769,684		)
Income before income taxes	$	82,851		$	232,257		$	84,940		$	400,048		$	30,358		$	430,406
Year ended December 31, 2016:
Net interest income	$	268,654		$	311,704		$	44,113		$	624,471		$	55,578		$	680,049
Provision for loan losses	(36,042		)	4,378			(122		)	(31,786		)	(4,532		)	(36,318		)
Non-interest income	131,988			199,384			144,661			476,033			(1,641		)	474,392
Investment securities losses, net	—			—			—			—			(53		)	(53		)
Non-interest expense	(282,061		)	(284,432		)	(113,888		)	(680,381		)	(36,684		)	(717,065		)
Income before income taxes	$	82,539		$	231,034		$	74,764		$	388,337		$	12,668		$	401,005
Year ended December 31, 2015:
Net interest income	$	266,328		$	296,510		$	42,653		$	605,491		$	28,829		$	634,320
Provision for loan losses	(34,864		)	1,032			75			(33,757		)	5,030			(28,727		)
Non-interest income	119,561			194,133			136,374			450,068			(1,929		)	448,139
Investment securities gains, net	—			—			—			—			6,320			6,320
Non-interest expense	(273,378		)	(267,343		)	(108,755		)	(649,476		)	(27,011		)	(676,487		)
Income before income taxes	$	77,647		$	224,332		$	70,347		$	372,326		$	11,239		$	383,565

The segment activity, as shown above, includes both direct and allocated items. Amounts in the “Other/Elimination” column include activity not related to the segments, such as that relating to administrative functions, the investment securities portfolio, and the effect of certain expense allocations to the segments. The provision for loan losses in this category contains the difference between net loan charge-offs assigned directly to the segments and the recorded provision for loan loss expense. Included in this category’s net interest income are earnings of the investment portfolio, which are not allocated to a segment.

Segment Balance Sheet Data

(In thousands)	Consumer		Commercial		Wealth		Segment Totals		Other/Elimination		Consolidated Totals
Average balances for 2017:
Assets	$	2,610,045	$	8,830,584	$	1,218,598	$	12,659,227	$	12,372,381	$	25,031,608
Loans, including held for sale	2,471,578		8,635,035		1,209,792		12,316,405		1,312,746		13,629,151
Goodwill and other intangible assets	76,734		68,538		746		146,018		—		146,018
Deposits	10,190,613		8,301,004		2,090,582		20,582,199		12,587		20,594,786
Average balances for 2016:
Assets	$	2,673,915	$	8,267,963	$	1,116,969	$	12,058,847	$	12,497,624	$	24,556,471
Loans, including held for sale	2,533,528		8,072,528		1,108,211		11,714,267		1,239,221		12,953,488
Goodwill and other intangible assets	75,971		68,848		746		145,565		—		145,565
Deposits	9,956,327		8,243,394		2,084,940		20,284,661		46,252		20,330,913

The above segment balances include only those items directly associated with the segment. The “Other/Elimination” column includes unallocated bank balances not associated with a segment (such as investment securities and federal funds sold), balances relating to certain other administrative and corporate functions, and eliminations between segment and non-segment balances. This column also includes the resulting effect of allocating such items as float, deposit reserve and capital for the purpose of computing the cost or credit for funds used/provided.

The Company’s reportable segments are strategic lines of business that offer different products and services. They are managed separately because each line services a specific customer need, requiring different performance measurement analyses and marketing strategies. The performance measurement of the segments is based on the management structure of the Company and is not necessarily comparable with similar information for any other financial institution. The information is also not necessarily indicative of the segments’ financial condition and results of operations if they were independent entities.

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Common and Preferred Stock

12 Months Ended

Dec. 31, 2017

Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract]

Common Stock

Common and Preferred Stock*

On December 18, 2017, the Company distributed a 5% stock dividend on its $5 par common stock for the 24th consecutive year. All per common share data in this report has been restated to reflect the stock dividend.

The Company applies the two-class method of computing income per share, as nonvested share-based awards that pay nonforfeitable common stock dividends are considered securities which participate in undistributed earnings with common stock. The two-class method requires the calculation of separate income per share amounts for the nonvested share-based awards and for common stock. Income per share attributable to common stock is shown in the following table. Nonvested share-based awards are further discussed in Note 10 on Stock-Based Compensation.

Basic income per share is based on the weighted average number of common shares outstanding during the year. Diluted income per share gives effect to all dilutive potential common shares that were outstanding during the year. Presented below is a summary of the components used to calculate basic and diluted income per common share, which have been restated for all stock dividends.

(In thousands, except per share data)	2017		2016		2015
Basic income per common share:
Net income attributable to Commerce Bancshares, Inc.	$	319,383	$	275,391	$	263,730
Less preferred stock dividends	9,000		9,000		9,000
Net income available to common shareholders	310,383		266,391		254,730
Less income allocated to nonvested restricted stock	3,848		3,698		3,548
Net income allocated to common stock	$	306,535	$	262,693	$	251,182
Weighted average common shares outstanding	105,555		105,243		108,016
Basic income per common share	$	2.90	$	2.50	$	2.33
Diluted income per common share:
Net income available to common shareholders	$	310,383	$	266,391	$	254,730
Less income allocated to nonvested restricted stock	3,838		3,692		3,541
Net income allocated to common stock	$	306,545	$	262,699	$	251,189
Weighted average common shares outstanding	105,555		105,243		108,016
Net effect of the assumed exercise of stock-based awards -- based on the treasury stock method using the average market price for the respective periods	372		281		336
Weighted average diluted common shares outstanding	105,927		105,524		108,352
Diluted income per common share	$	2.89	$	2.49	$	2.32

Unexercised stock options and stock appreciation rights of 152 thousand, 99 thousand and 443 thousand were excluded from the computation of diluted income per share for the years ended December 31, 2017, 2016 and 2015, respectively, because their inclusion would have been anti-dilutive.

The Company has 6,000,000 depositary shares outstanding, representing 6,000 shares of 6.00% Series B Non-Cumulative Perpetual Preferred Stock, par value $1.00 per share, having an aggregate liquidation preference of $150.0 million (“Series B Preferred Stock”). Each depositary share has a liquidation preference of $25 per share. Dividends on the Series B Preferred Stock, if declared, accrue and are payable quarterly, in arrears, at a rate of 6.00%. The Series B Preferred Stock qualifies as Tier 1 capital for the purposes of the regulatory capital calculations. In the event that the Company does not declare and pay dividends on the Series B Preferred Stock for the most recent dividend period, the ability of the Company to declare or pay dividends on, purchase, redeem or otherwise acquire shares of its common stock or any securities of the Company that rank junior to the Series B Preferred Stock is subject to certain restrictions under the terms of the Series B Preferred Stock.

The Company entered into accelerated share repurchase programs in 2014 and 2015 for $200.0 million and $100.0 million, respectively. Final settlement of the programs occurred in mid-2015, and a total of 7.9 million shares of common stock were received by the Company under the programs. Shares purchased under these programs were part of the Company's stock repurchase program, as authorized by its Board of Directors. The most recent authorization in October 2015 approved future purchases of 5,000,000 shares of the Company's common stock. At December 31, 2017, 3,443,523 shares of common stock remained available for purchase under the current authorization.

The table below shows activity in the outstanding shares of the Company’s common stock during the past three years. Shares in the table below are presented on an historical basis and have not been restated for the annual 5% stock dividends.

	Years Ended December 31
(In thousands)	2017		2016		2015
Shares outstanding at January 1	101,461		97,226		96,327
Issuance of stock:
Awards and sales under employee and director plans	403		397		435
5% stock dividend	5,078		4,831		4,641
Purchases of treasury stock under accelerated share repurchase programs	—		—		(3,635	)
Other purchases of treasury stock	(315	)	(959	)	(535	)
Other	(12	)	(34	)	(7	)
Shares outstanding at December 31	106,615		101,461		97,226

* Except as noted in the above table, all share and per share amounts in this note have been restated for the 5% common stock dividend distributed in 2017.

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Regulatory Capital Requirements

12 Months Ended

Dec. 31, 2017

Regulatory Capital Requirements [Abstract]

Regulatory Capital Requirements

Regulatory Capital Requirements

The Company is subject to various regulatory capital requirements administered by the federal banking agencies. Failure to meet minimum capital requirements can initiate certain mandatory and additional discretionary actions by regulators that could have a direct material effect on the Company’s financial statements. The regulations require the Company to meet specific capital adequacy guidelines that involve quantitative measures of the Company’s assets, liabilities and certain off-balance sheet items as calculated under regulatory accounting practices. The Company’s capital classification is also subject to qualitative judgments by the regulators about components, risk weightings and other factors.

The following tables show the capital amounts and ratios for the Company (on a consolidated basis) and the Bank, together with the minimum capital adequacy and well-capitalized capital requirements, at the last two year ends.

	Actual				Minimum Capital Adequacy Requirement				Well-Capitalized Capital Requirement
(Dollars in thousands)	Amount		Ratio		Amount		Ratio		Amount		Ratio
December 31, 2017
Total Capital (to risk-weightedassets):
Commerce Bancshares, Inc. (consolidated)	$	2,747,863	14.35	%	$	1,531,996	8.00	%	N.A.		N.A.
Commerce Bank	2,428,789		12.76		1,522,361		8.00		$	1,902,951	10.00	%
Tier I Capital (to risk-weightedassets):
Commerce Bancshares, Inc. (consolidated)	$	2,567,264	13.41	%	$	1,148,997	6.00	%	N.A.		N.A.
Commerce Bank	2,268,131		11.92		1,141,771		6.00		$	1,522,361	8.00	%
Tier I Common Capital (to risk-weightedassets):
Commerce Bancshares, Inc. (consolidated)	$	2,422,480	12.65	%	$	861,748	4.50	%	N.A.		N.A.
Commerce Bank	2,268,131		11.92		856,328		4.50		$	1,236,918	6.50	%
Tier I Capital (to adjusted quarterly average assets):
(Leverage Ratio)
Commerce Bancshares, Inc. (consolidated)	$	2,567,264	10.39	%	$	988,653	4.00	%	N.A.		N.A.
Commerce Bank	2,268,131		9.20		986,240		4.00		$	1,232,800	5.00	%
December 31, 2016
Total Capital (to risk-weightedassets):
Commerce Bancshares, Inc. (consolidated)	$	2,529,675	13.32	%	$	1,519,578	8.00	%	N.A.		N.A.
Commerce Bank	2,268,845		12.00		1,512,471		8.00		$	1,890,589	10.00	%
Tier I Capital (to risk-weightedassets):
Commerce Bancshares, Inc. (consolidated)	$	2,352,154	12.38	%	$	1,139,684	6.00	%	N.A.		N.A.
Commerce Bank	2,111,797		11.17		1,134,353		6.00		$	1,512,471	8.00	%
Tier I Common Capital (to risk-weightedassets):
Commerce Bancshares, Inc. (consolidated)	$	2,207,370	11.62	%	$	854,763	4.50	%	N.A.		N.A.
Commerce Bank	2,111,797		11.17		850,765		4.50		$	1,228,883	6.50	%
Tier I Capital (to adjusted quarterly average assets):
(Leverage Ratio)
Commerce Bancshares, Inc. (consolidated)	$	2,352,154	9.55	%	$	985,698	4.00	%	N.A.		N.A.
Commerce Bank	2,111,797		8.59		983,081		4.00		$	1,228,851	5.00	%

The minimum required ratios for well-capitalized banks (under prompt corrective action provisions) are 6.5% for Tier I common capital, 8.0% for Tier I capital, 10.0% for Total capital and 5.0% for the leverage ratio.

At December 31, 2017 and 2016, the Company met all capital requirements to which it is subject, and the Bank’s capital position exceeded the regulatory definition of well-capitalized.

XML

Fair Value Measurements

12 Months Ended

Dec. 31, 2017

Fair Value Disclosures [Abstract]

Fair Value Measurements

Fair Value Measurements

The Company uses fair value measurements to record fair value adjustments to certain financial and nonfinancial assets and liabilities and to determine fair value disclosures. Various financial instruments such as available for sale and trading securities, certain non-marketable securities relating to private equity activities, and derivatives are recorded at fair value on a recurring basis. Additionally, from time to time, the Company may be required to record at fair value other assets and liabilities on a nonrecurring basis, such as loans held for sale, mortgage servicing rights and certain other investment securities. These nonrecurring fair value adjustments typically involve lower of cost or fair value accounting, or write-downs of individual assets.

Fair value is the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. Depending on the nature of the asset or liability, the Company uses various valuation techniques and assumptions when estimating fair value. For accounting disclosure purposes, a three-level valuation hierarchy of fair value measurements has been established. The valuation hierarchy is based upon the transparency of inputs to the valuation of an asset or liability as of the measurement date. The three levels are defined as follows:

• Level 1 – inputs to the valuation methodology are quoted prices for identical assets or liabilities in active markets.

• Level 2 – inputs to the valuation methodology include quoted prices for similar assets and liabilities in active markets, quoted prices for identical or similar assets and liabilities in markets that are not active, and inputs that are observable for the assets or liabilities, either directly or indirectly (such as interest rates, yield curves, and prepayment speeds).

• Level 3 – inputs to the valuation methodology are unobservable and significant to the fair value. These may be internally developed, using the Company’s best information and assumptions that a market participant would consider.

When determining the fair value measurements for assets and liabilities required or permitted to be recorded or disclosed at fair value, the Company considers the principal or most advantageous market in which it would transact and considers assumptions that market participants would use when pricing the asset or liability. When possible, the Company looks to active and observable markets to price identical assets or liabilities. When identical assets and liabilities are not traded in active markets, the Company looks to observable market data for similar assets and liabilities. Nevertheless, certain assets and liabilities are not actively traded in observable markets, and the Company must use alternative valuation techniques to derive an estimated fair value measurement.

Instruments Measured at Fair Value on a Recurring Basis

The table below presents the carrying values of assets and liabilities measured at fair value on a recurring basis at December 31, 2017 and 2016. There were no transfers among levels during these years.

			Fair Value Measurements Using
(In thousands)	Total Fair Value		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs  (Level 3)
December 31, 2017
Assets:
Residential mortgage loans held for sale	$	15,327	$	—	$	15,327	$	—
Available for sale securities:
U.S. government and federal agency obligations	917,147		917,147		—		—
Government-sponsored enterprise obligations	406,363		—		406,363		—
State and municipal obligations	1,611,366		—		1,594,350		17,016
Agency mortgage-backed securities	3,040,913		—		3,040,913		—
Non-agency mortgage-backed securities	905,793		—		905,793		—
Asset-backed securities	1,492,800		—		1,492,800		—
Other debt securities	351,060		—		351,060		—
Equity securities	48,838		19,864		28,974		—
Trading securities	18,269		—		18,269		—
Private equity investments	55,752		—		—		55,752
Derivatives *	8,349		—		7,723		626
Assets held in trust for deferred compensation plan	12,843		12,843		—		—
Total assets	8,884,820		949,854		7,861,572		73,394
Liabilities:
Derivatives *	8,074		—		7,951		123
Liabilities held in trust for deferred compensation plan	12,843		12,843		—		—
Total liabilities	$	20,917	$	12,843	$	7,951	$	123
December 31, 2016
Assets:
Residential mortgage loans held for sale	$	9,263	$	—	$	9,263	$	—
Available for sale securities:
U.S. government and federal agency obligations	920,904		920,904		—		—
Government-sponsored enterprise obligations	449,998		—		449,998		—
State and municipal obligations	1,778,214		—		1,761,532		16,682
Agency mortgage-backed securities	2,685,931		—		2,685,931		—
Non-agency mortgage-backed securities	1,055,639		—		1,055,639		—
Asset-backed securities	2,381,301		—		2,381,301		—
Other debt securities	325,953		—		325,953		—
Equity securities	51,263		24,967		26,296		—
Trading securities	22,225		—		22,225		—
Private equity investments	50,820		—		—		50,820
Derivatives *	13,566		—		13,146		420
Assets held in trust for deferred compensation plan	10,261		10,261		—		—
Total assets	9,755,338		956,132		8,731,284		67,922
Liabilities:
Derivatives *	13,339		—		13,177		162
Liabilities held in trust for deferred compensation plan	10,261		10,261		—		—
Total liabilities	$	23,600	$	10,261	$	13,177	$	162

* The fair value of each class of derivative is shown in Note 17.

.

Valuation methods for instruments measured at fair value on a recurring basis

Following is a description of the Company’s valuation methodologies used for instruments measured at fair value on a recurring basis:

Residential mortgage loans held for sale

The Company originates fixed rate, first lien residential mortgage loans that are intended for sale in the secondary market. Fair value is based on quoted secondary market prices for loans with similar characteristics, which are adjusted to include the embedded servicing value in the loans. This adjustment represents an unobservable input to the valuation but is not considered significant given the relative insensitivity of the valuation to changes in this input. Accordingly, these loan measurements are classified as Level 2.

Available for sale investment securities

For available for sale securities, changes in fair value, including that portion of other-than-temporary impairment unrelated to credit loss, are recorded in other comprehensive income. As mentioned in Note 3 on Investment Securities, the Company records the credit-related portion of other-than-temporary impairment in current earnings. This portfolio comprises the majority of the assets which the Company records at fair value. Most of the portfolio, which includes government-sponsored enterprise, mortgage-backed and asset-backed securities, are priced utilizing industry-standard models that consider various assumptions, including time value, yield curves, volatility factors, prepayment speeds, default rates, loss severity, current market and contractual prices for the underlying financial instruments, as well as other relevant economic measures. Substantially all of these assumptions are observable in the marketplace, can be derived from observable data, or are supported by observable levels at which transactions are executed in the marketplace. These measurements are classified as Level 2 in the fair value hierarchy. Where quoted prices are available in an active market, the measurements are classified as Level 1. Most of the Level 1 measurements apply to equity securities and U.S. Treasury obligations.

The fair values of Level 1 and 2 securities (excluding equity securities) in the available for sale portfolio are prices provided by a third-party pricing service. The prices provided by the third-party pricing service are based on observable market inputs, as described in the sections below. On a quarterly basis, the Company compares a sample of these prices to other independent sources for the same and similar securities. Variances are analyzed, and, if appropriate, additional research is conducted with the third-party pricing service. Based on this research, the pricing service may affirm or revise its quoted price. No significant adjustments have been made to the prices provided by the pricing service. The pricing service also provides documentation on an ongoing basis that includes reference data, inputs and methodology by asset class, which is reviewed to ensure that security placement within the fair value hierarchy is appropriate.

Valuation methods and inputs, by class of security:

• U.S. government and federal agency obligations

U.S. treasury bills, bonds and notes, including inflation-protected securities, are valued using live data from active market makers and inter-dealer brokers. Valuations for stripped coupon and principal issues are derived from yield curves generated from various dealer contacts and live data sources.

• Government-sponsored enterprise obligations

Government-sponsored enterprise obligations are evaluated using cash flow valuation models. Inputs used are live market data, cash settlements, Treasury market yields, and floating rate indices such as LIBOR, CMT, and Prime.

• State and municipal obligations, excluding auction rate securities

A yield curve is generated and applied to bond sectors, and individual bond valuations are extrapolated. Inputs used to generate the yield curve are bellwether issue levels, established trading spreads between similar issuers or credits, historical trading spreads over widely accepted market benchmarks, new issue scales, and verified bid information. Bid information is verified by corroborating the data against external sources such as broker-dealers, trustees/paying agents, issuers, or non-affiliated bondholders.

• Mortgage and asset-backed securities

Collateralized mortgage obligations and other asset-backed securities are valued at the tranche level. For each tranche valuation, the process generates predicted cash flows for the tranche, applies a market based (or benchmark) yield/spread for each tranche, and incorporates deal collateral performance and tranche level attributes to determine tranche-specific spreads to adjust the benchmark yield. Tranche cash flows are generated from new deal files and prepayment/default assumptions. Tranche spreads are based on tranche characteristics such as average life, type, volatility, ratings, underlying collateral and performance, and prevailing market conditions. The appropriate tranche spread is applied to the corresponding benchmark, and the resulting value is used to discount the cash flows to generate an evaluated price.

Valuation of agency pass-through securities, typically issued under GNMA, FNMA, FHLMC, and SBA programs, are primarily derived from information from the To Be Announced (TBA) market. This market consists of generic mortgage pools which have not been received for settlement. Snapshots of the TBA market, using live data feeds distributed by multiple electronic platforms, are used in conjunction with other indices to compute a price based on discounted cash flow models.

• Other debt securities

Other debt securities are valued using active markets and inter-dealer brokers as well as bullet spread scales and option adjusted spreads. The spreads and models use yield curves, terms and conditions of the bonds, and any special features (e.g., call or put options and redemption features).

• Equity securities

Equity securities are priced using the market prices for each security from the major stock exchanges or other electronic quotation systems. These are generally classified as Level 1 measurements. Stocks which trade infrequently are classified as Level 2.

The available for sale portfolio includes certain auction rate securities. The auction process by which the auction rate securities are normally priced has not functioned in recent years, and due to the illiquidity in the market, the fair value of these securities cannot be based on observable market prices. The fair values of these securities are estimated using a discounted cash flows analysis which is discussed more fully in the Level 3 Inputs section of this note. Because many of the inputs significant to the measurement are not observable, these measurements are classified as Level 3 measurements.

Trading securities

The securities in the Company’s trading portfolio are priced by averaging several broker quotes for similar instruments and are classified as Level 2 measurements.

Private equity investments

These securities are held by the Company’s private equity subsidiaries and are included in non-marketable investment securities in the consolidated balance sheets. Due to the absence of quoted market prices, valuation of these nonpublic investments requires significant management judgment. These fair value measurements, which are discussed in the Level 3 Inputs section of this note, are classified as Level 3.

Derivatives

The Company’s derivative instruments include interest rate swaps, foreign exchange forward contracts, and certain credit risk guarantee agreements. When appropriate, the impact of credit standing as well as any potential credit enhancements, such as collateral, has been considered in the fair value measurement.

• Valuations for interest rate swaps are derived from a proprietary model whose significant inputs are readily observable market parameters, primarily yield curves used to calculate current exposure. Counterparty credit risk is incorporated into the model and calculated by applying a net credit spread over LIBOR to the swap's total expected exposure over time. The net credit spread is comprised of spreads for both the Company and its counterparty, derived from probability of default and other loss estimate information obtained from a third party credit data provider or from the Company's Credit Department when not otherwise available. The credit risk component is not significant compared to the overall fair value of the swaps. The results of the model are constantly validated through comparison to active trading in the marketplace.

Parties to swaps requiring central clearing are required to post collateral (generally in the form of cash or marketable securities) to an authorized clearing agency that holds and monitors the collateral. In January 2017, the Company's clearing counterparty made rule changes to characterize a component of this collateral as a legal settlement of the derivative contract exposure. As a result, this component, known as variation margin, is no longer accounted for separately from the derivative as collateral, but is considered in determining the fair value of the derivative.

The fair value measurements of interest rate swaps are classified as Level 2.

• Fair value measurements for foreign exchange contracts are derived from a model whose primary inputs are quotations from global market makers and are classified as Level 2.

• The Company’s contracts related to credit risk guarantees are valued under a proprietary model which uses unobservable inputs and assumptions about the creditworthiness of the counterparty (generally a Bank customer). Customer credit spreads, which are based on probability of default and other loss estimates, are calculated internally by the Company's Credit Department, as mentioned above, and are based on the Company's internal risk rating for each customer. Because these inputs are significant to the measurements, they are classified as Level 3.

• Derivatives relating to residential mortgage loan sale activity include commitments to originate mortgage loans held for sale, forward loan sale contracts, and forward commitments to sell TBA securities. The fair values of loan commitments and sale contracts are estimated using quoted market prices for loans similar to the underlying loans in these instruments. The valuations of loan commitments are further adjusted to include embedded servicing value and the probability of funding. These assumptions are considered Level 3 inputs and are significant to the loan commitment valuation; accordingly, the measurement of loan commitments is classified as Level 3. The fair value measurement of TBA contracts is based on security prices published on trading platforms and is classified as Level 2.

Assets held in trust

Assets held in an outside trust for the Company’s deferred compensation plan consist of investments in mutual funds. The fair value measurements are based on quoted prices in active markets and classified as Level 1. The Company has recorded an asset representing the total investment amount. The Company has also recorded a corresponding liability, representing the Company’s liability to the plan participants.

The changes in Level 3 assets and liabilities measured at fair value on a recurring basis are summarized as follows:

	Fair Value Measurements Using Significant Unobservable Inputs (Level 3)
(In thousands)	State and Municipal Obligations			Private Equity Investments			Derivatives			Total
Year ended December 31, 2017:
Balance at January 1, 2017	$	16,682		$	50,820		$	258		$	67,760
Total gains or losses (realized/unrealized):
Included in earnings	—			(5,833		)	266			(5,567		)
Included in other comprehensive income	882			—			—			882
Investment securities called	(600		)	—			—			(600		)
Discount accretion	52			—			—			52
Purchases of private equity securities	—			13,352			—			13,352
Sale / pay down of private equity securities	—			(2,621		)	—			(2,621		)
Capitalized interest/dividends	—			34			—			34
Purchase of risk participation agreement	—			—			70			70
Sale of risk participation agreement	—			—			(91		)	(91		)
Balance at December 31, 2017	$	17,016		$	55,752		$	503		$	73,271
Total gains or losses for the year included in earnings attributable to the change in unrealized gains or losses relating to assets still held at December 31, 2017	$	—		$	(5,658	)	$	615		$	(5,043	)
Year ended December 31, 2016:
Balance at January 1, 2016	$	17,195		$	63,032		$	69		$	80,296
Total gains or losses (realized/unrealized):
Included in earnings	—			(3,739		)	43			(3,696		)
Included in other comprehensive income	583			—			—			583
Investment securities called	(1,200		)	—			—			(1,200		)
Discount accretion	104			—			—			104
Purchases of private equity securities	—			9,906			—			9,906
Sale / pay down of private equity securities	—			(18,471		)	—			(18,471		)
Capitalized interest/dividends	—			92			—			92
Purchase of risk participation agreement	—			—			404			404
Sale of risk participation agreement	—			—			(258		)	(258		)
Balance at December 31, 2016	$	16,682		$	50,820		$	258		$	67,760
Total gains or losses for the year included in earnings attributable to the change in unrealized gains or losses relating to assets still held at December 31, 2016	$	—		$	(5,914	)	$	306		$	(5,608	)

Gains and losses on the Level 3 assets and liabilities in the table above are reported in the following income categories:

(In thousands)	Loan Fees and Sales		Other Non-Interest Income			Investment Securities Gains (Losses), Net			Total
Year ended December 31, 2017:
Total gains or losses included in earnings	$	231	$	35		$	(5,833	)	$	(5,567	)
Change in unrealized gains or losses relating to assets still held at December 31, 2017	$	580	$	35		$	(5,658	)	$	(5,043	)
Year ended December 31, 2016:
Total gains or losses included in earnings	$	87	$	(44	)	$	(3,739	)	$	(3,696	)
Change in unrealized gains or losses relating to assets still held at December 31, 2016	$	350	$	(44	)	$	(5,914	)	$	(5,608	)

Level 3 Inputs

As shown above, the Company's significant Level 3 measurements which employ unobservable inputs that are readily quantifiable pertain to auction rate securities (ARS) held by the Bank, investments in portfolio concerns held by the Company's private equity subsidiaries, and held for sale residential mortgage loan commitments. ARS are included in state and municipal securities and totaled $17.0 million at December 31, 2017, while private equity investments, included in non-marketable securities, totaled $55.8 million.

Information about these inputs is presented in the table and discussions below.

Quantitative Information about Level 3 Fair Value Measurements						Weighted
	Valuation Technique	Unobservable Input	Range			Average
Auction rate securities	Discounted cash flow	Estimated market recovery period			5 years
		Estimated market rate	3.1%	-	4.5%
Private equity investments	Market comparable companies	EBITDA multiple	4.0	-	6.0
Mortgage loan commitments	Discounted cash flow	Probability of funding	50.4%	-	100.0%	76.0%
		Embedded servicing value	(.3)%	-	2.0%	1.1%

The fair values of ARS are estimated using a discounted cash flows analysis in which estimated cash flows are based on mandatory interest rates paid under failing auctions and projected over an estimated market recovery period. Under normal conditions, ARS traded in weekly auctions and were considered liquid investments. The Company's estimate of when these auctions might resume is highly judgmental and subject to variation depending on current and projected market conditions. Few auctions of these securities have been successful in recent years, and most secondary transactions have been privately arranged. Estimated cash flows during the period over which the Company expects to hold the securities are discounted at an estimated market rate. These securities are comprised of bonds issued by various states and municipalities for healthcare and student lending purposes, and market rates are derived for each type. Market rates are calculated at each valuation date using a LIBOR or Treasury based rate plus spreads representing adjustments for liquidity premium and nonperformance risk. The spreads are developed internally by employees in the Company's bond department. An increase in the holding period alone would result in a higher fair value measurement, while an increase in the estimated market rate (the discount rate) alone would result in a lower fair value measurement. The valuation of the ARS portfolio is reviewed on a quarterly basis by the Company's chief investment officers.

The fair values of the Company's private equity investments are based on a determination of fair value of the investee company less preference payments assuming the sale of the investee company.  Investee companies are normally non-public entities.  The fair value of the investee company is determined by reference to the investee's total earnings before interest, depreciation/amortization, and income taxes (EBITDA) multiplied by an EBITDA factor.  EBITDA is normally determined based on a trailing prior period adjusted for specific factors including current economic outlook, investee management, and specific unique circumstances such as sales order information, major customer status, regulatory changes, etc.  The EBITDA multiple is based on management's review of published trading multiples for recent private equity transactions and other judgments and is derived for each individual investee.  The fair value of the Company's investment (which is usually a partial interest in the investee company) is then calculated based on its ownership percentage in the investee company. On a quarterly basis, these fair value analyses are reviewed by a valuation committee consisting of investment managers and senior Company management.

The significant unobservable inputs used in the fair value measurement of the Company’s derivative commitments to originate residential mortgage loans are the percentage of commitments that are actually funded and the mortgage servicing value that is inherent in the underlying loan value. A significant increase in the rate of loans that fund would result in a larger derivative asset or liability. A significant increase in the inherent mortgage servicing value would result in an increase in the derivative asset or a reduction in the derivative liability. The probability of funding and the inherent mortgage servicing values are directly impacted by changes in market rates and will generally move in the same direction as interest rates.

Instruments Measured at Fair Value on a Nonrecurring Basis

For assets measured at fair value on a nonrecurring basis during 2017 and 2016, and still held as of December 31, 2017 and 2016, the following table provides the adjustments to fair value recognized during the respective periods, the level of valuation assumptions used to determine each adjustment, and the carrying value of the related individual assets or portfolios at December 31, 2017 and 2016.

			Fair Value Measurements Using
(In thousands)	Fair Value		Quoted Prices in Active Markets for Identical Assets  (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs  (Level 3)		Total Gains (Losses)
Balance at December 31, 2017
Collateral dependent impaired loans	$	1,236	$	—	$	—	$	1,236	$	(617	)
Mortgage servicing rights	4,653		—		—		4,653		13
Foreclosed assets	—		—		—		—		(9		)
Long-lived assets	3,378		—		—		3,378		(724		)
Balance at December 31, 2016
Collateral dependent impaired loans	$	1,331	$	—	$	—	$	1,331	$	(1,700	)
Mortgage servicing rights	2,868		—		—		2,868		7
Foreclosed assets	18		—		—		18		(20		)
Long-lived assets	2,408		—		—		2,408		(1,054		)

Valuation methods for instruments measured at fair value on a nonrecurring basis

Following is a description of the Company’s valuation methodologies used for other financial and nonfinancial instruments measured at fair value on a nonrecurring basis.

Collateral dependent impaired loans

While the overall loan portfolio is not carried at fair value, the Company periodically records nonrecurring adjustments to the carrying value of loans based on fair value measurements for partial charge-offs of the uncollectible portions of those loans. Nonrecurring adjustments also include certain impairment amounts for collateral dependent loans when establishing the allowance for loan losses. Such amounts are generally based on the fair value of the underlying collateral supporting the loan. In determining the value of real estate collateral, the Company relies on external and internal appraisals of property values depending on the size and complexity of the real estate collateral. The Company maintains a staff of qualified appraisers who also review third party appraisal reports for reasonableness. In the case of non-real estate collateral, reliance is placed on a variety of sources, including external estimates of value and judgments based on the experience and expertise of internal specialists. Values of all loan collateral are regularly reviewed by credit administration. Unobservable inputs to these measurements, which include estimates and judgments often used in conjunction with appraisals, are not readily quantifiable. These measurements are classified as Level 3. Changes in fair value recognized for partial charge-offs of loans and loan impairment reserves on loans held by the Company at December 31, 2017 and 2016 are shown in the table above.

Private equity investments and restricted stock

These assets are included in non-marketable investment securities in the consolidated balance sheets.  They include certain investments in private equity concerns held by the Parent company which are carried at cost, reduced by other-than-temporary impairment. These investments are periodically evaluated for impairment based on their estimated fair value as determined by review of available information, most of which is provided as monthly or quarterly internal financial statements, annual audited financial statements, investee tax returns, and in certain situations, through research into and analysis of the assets and investments held by those private equity concerns.   Restricted stock consists of stock issued by the Federal Reserve Bank and FHLB which is held by the bank subsidiary as required for regulatory purposes.  Generally, there are restrictions on the sale and/or liquidation of these investments, and they are carried at cost, reduced by other-than-temporary impairment.  Fair value measurements for these securities are classified as Level 3.

Mortgage servicing rights

The Company initially measures its mortgage servicing rights at fair value and amortizes them over the period of estimated net servicing income. They are periodically assessed for impairment based on fair value at the reporting date. Mortgage servicing rights do not trade in an active market with readily observable prices. Accordingly, the fair value is estimated based on a valuation model which calculates the present value of estimated future net servicing income. The model incorporates assumptions that market participants use in estimating future net servicing income, including estimates of prepayment speeds, market discount rates, cost to service, float earnings rates, and other ancillary income, including late fees. The fair value measurements are classified as Level 3.

Foreclosed assets

Foreclosed assets consist of loan collateral which has been repossessed through foreclosure. This collateral is comprised of commercial and residential real estate and other non-real estate property, including auto, marine and recreational vehicles. Foreclosed assets are initially recorded as held for sale at the lower of the loan balance or fair value of the collateral less estimated selling costs. Subsequent to foreclosure, valuations are updated periodically, and the assets may be marked down further, reflecting a new cost basis. Fair value measurements may be based upon appraisals, third-party price opinions, or internally developed pricing methods. These measurements are classified as Level 3.

Long-lived assets

When investments in branch facilities and various office buildings are determined to be impaired, their carrying values are written down to estimated fair value, or estimated fair value less cost to sell if the property is held for sale. Fair value is estimated in a process which considers current local commercial real estate market conditions and the judgment of the sales agent and often involves obtaining third party appraisals from certified real estate appraisers. The carrying amounts of these real estate holdings are regularly monitored by real estate professionals employed by the Company. These fair value measurements are classified as Level 3. Unobservable inputs to these measurements, which include estimates and judgments often used in conjunction with appraisals, are not readily quantifiable.

XML

Fair Value Of Financial Instruments

12 Months Ended

Dec. 31, 2017

Fair Value Disclosures [Abstract]

Fair Value Of Financial Instruments

Fair Value of Financial Instruments

The carrying amounts and estimated fair values of financial instruments held by the Company, in addition to a discussion of the methods used and assumptions made in computing those estimates, are set forth below.

Loans

The fair values of loans are estimated by discounting the expected future cash flows using the current rates at which similar loans would be made to borrowers with similar credit ratings and for the same remaining terms. This method of estimating fair value does not incorporate the exit-price concept of fair value prescribed by ASC 820 “Fair Value Measurements and Disclosures”. Future cash flows for each individual loan are modeled using current rates and all contractual features, while adjusting for optionality such as prepayments. Loans with potential optionality are modeled under a multiple-rate path process. Each loan's expected future cash flows are discounted using the LIBOR/swap curve plus an appropriate spread. For business, construction and business real estate loans, internally-developed pricing spreads based on loan type, term and credit score are utilized. The spread for personal real estate loans is generally based on newly originated loans with similar characteristics. For consumer loans, the spread is calculated at loan origination as part of the Bank's funds transfer pricing process, which is indicative of individual borrower creditworthiness. All consumer credit card loans are discounted at the same spread, depending on whether the rate is variable or fixed.

Loans Held for Sale, Investment Securities and Derivative Instruments

Detailed descriptions of the fair value measurements of these instruments are provided in Note 15 on Fair Value Measurements.

Federal Funds Purchased and Sold, Interest Earning Deposits With Banks and Cash and Due From Banks

The carrying amounts of federal funds purchased and sold, interest earning deposits with banks, and cash and due from banks approximates fair value, as these instruments are payable on demand or mature overnight.

Securities Purchased/Sold under Agreements to Resell/Repurchase

The fair values of these investments and borrowings are estimated by discounting contractual cash flows using an estimate of the current market rate for similar instruments.

Deposits

The fair value of deposits with no stated maturity is equal to the amount payable on demand. Such deposits include savings and interest and non-interest bearing demand deposits. These fair value estimates do not recognize any benefit the Company receives as a result of being able to administer, or control, the pricing of these accounts. Because they are payable on demand, they are classified as Level 1 in the fair value hierarchy. The fair value of time open and certificates of deposit is based on the discounted value of cash flows, taking early withdrawal optionality into account. Discount rates are based on the Company’s approximate cost of obtaining similar maturity funding in the market. Their fair value measurement is classified as Level 3.

Other Borrowings

The fair value of other borrowings, which consists mainly of long-term debt, is estimated by discounting contractual cash flows using an estimate of the current market rate for similar instruments.

The estimated fair values of the Company’s financial instruments are as follows:

	Fair Value Hierarchy Level	2017				2016
(In thousands)		Carrying Amount		Estimated Fair Value		Carrying Amount		Estimated Fair Value
Financial Assets
Loans:
Business	Level 3	$	4,958,554	$	4,971,401	$	4,776,365	$	4,787,469
Real estate - construction and land	Level 3	968,820		979,389		791,236		800,426
Real estate - business	Level 3	2,697,452		2,702,598		2,643,374		2,658,093
Real estate - personal	Level 3	2,062,787		2,060,443		2,010,397		2,005,227
Consumer	Level 3	2,104,487		2,074,129		1,990,801		1,974,784
Revolving home equity	Level 3	400,587		400,333		413,634		414,499
Consumer credit card	Level 3	783,864		798,093		776,465		794,856
Overdrafts	Level 3	7,123		7,123		10,464		10,464
Loans held for sale	Level 2	21,398		21,398		14,456		14,456
Investment securities:
Available for sale	Level 1	937,011		937,011		945,871		945,871
Available for sale	Level 2	7,820,253		7,820,253		8,686,650		8,686,650
Available for sale	Level 3	17,016		17,016		16,682		16,682
Trading	Level 2	18,269		18,269		22,225		22,225
Non-marketable	Level 3	100,758		100,758		99,558		99,558
Federal funds sold	Level 1	42,775		42,775		15,470		15,470
Securities purchased under agreements to resell	Level 3	700,000		695,194		725,000		728,179
Interest earning deposits with banks	Level 1	30,631		30,631		272,275		272,275
Cash and due from banks	Level 1	438,439		438,439		494,690		494,690
Derivative instruments	Level 2	7,723		7,723		13,146		13,146
Derivative instruments	Level 3	626		626		420		420
Assets held in trust for deferred compensation plan	Level 1	12,843		12,843		10,261		10,261
Financial Liabilities
Non-interest bearing deposits	Level 1	$	7,158,962	$	7,158,962	$	7,429,398	$	7,429,398
Savings, interest checking and money market deposits	Level 1	11,499,620		11,499,620		11,430,789		11,430,789
Time open and certificates of deposit	Level 3	1,766,864		1,768,780		2,240,908		2,235,218
Federal funds purchased	Level 1	202,370		202,370		52,840		52,840
Securities sold under agreements to repurchase	Level 3	1,304,768		1,305,375		1,671,065		1,671,227
Other borrowings	Level 3	1,758		1,758		102,049		104,298
Derivative instruments	Level 2	7,951		7,951		13,177		13,177
Derivative instruments	Level 3	123		123		162		162
Liabilities held in trust for deferred compensation plan	Level 1	12,843		12,843		10,261		10,261

Off-Balance Sheet Financial Instruments

The fair value of letters of credit and commitments to extend credit is based on the fees currently charged to enter into similar agreements. The aggregate of these fees is not material. These instruments are also referenced in Note 19 on Commitments, Contingencies and Guarantees.

Limitations

Fair value estimates are made at a specific point in time based on relevant market information. They do not reflect any premium or discount that could result from offering for sale at one time the Company’s entire holdings of a particular financial instrument. Because no market exists for many of the Company’s financial instruments, fair value estimates are based on judgments regarding future expected loss experience, risk characteristics and economic conditions. These estimates are subjective, involve uncertainties and cannot be determined with precision. Changes in assumptions could significantly affect the estimates.

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Derivative Instruments

12 Months Ended

Dec. 31, 2017

Derivative Instrument Detail [Abstract]

Derivative Instruments

Derivative Instruments

The notional amounts of the Company’s derivative instruments are shown in the table below. These contractual amounts, along with other terms of the derivative, are used to determine amounts to be exchanged between counterparties and are not a measure of loss exposure. The Company's derivative instruments are accounted for as free-standing derivatives, and changes in their fair value are recorded in current earnings.

	December 31
(In thousands)	2017		2016
Interest rate swaps	$	1,741,412	$	1,685,099
Interest rate caps	31,776		59,379
Credit risk participation agreements	133,488		121,514
Foreign exchange contracts	11,826		4,046
Mortgage loan commitments	17,110		12,429
Mortgage loan forward sale contracts	2,566		6,626
Forward TBA contracts	25,000		15,000
Total notional amount	$	1,963,178	$	1,904,093

The largest group of notional amounts relate to interest rate swap contracts sold to commercial customers who wish to modify their interest rate sensitivity. The customers are engaged in a variety of businesses, including real estate, manufacturing, retail product distribution, education, and retirement communities. These customer swaps are offset by matching contracts purchased by the Company from other financial dealer institutions. Contracts with dealers that require central clearing are novated to a clearing agency who becomes the Company's counterparty. Because of the matching terms of the offsetting contracts, in addition to collateral provisions which mitigate the impact of non-performance risk, changes in fair value subsequent to initial recognition have a minimal effect on earnings.

Many of the Company’s interest rate swap arrangements with large financial institutions contain contingent features relating to debt ratings or capitalization levels. Under these provisions, if the Company’s debt rating falls below investment grade or if the Company ceases to be “well-capitalized” under risk-based capital guidelines, certain counterparties can require immediate and ongoing collateralization on interest rate swaps in net liability positions, or can require instant settlement of the contracts. The Company maintains debt ratings and capital well above these minimum requirements.

The Company’s foreign exchange activity involves the purchase and sale of forward foreign exchange contracts, which are commitments to purchase or deliver a specified amount of foreign currency at a specific future date. This activity enables customers involved in international business to hedge their exposure to foreign currency exchange rate fluctuations. The Company minimizes its related exposure arising from these customer transactions with offsetting contracts for the same currency and time frame. Risk arises from changes in the currency exchange rate and from the potential for counterparty nonperformance. These risks are controlled by adherence to a foreign exchange trading policy which contains control limits on currency amounts, open positions, maturities and losses, and procedures for approvals, record-keeping, monitoring and reporting. Hedge accounting has not been applied to these foreign exchange activities.

Credit risk participation agreements arise when the Company contracts, as a guarantor or beneficiary, with other financial institutions to share credit risk associated with certain interest rate swaps. The Company’s risks and responsibilities as guarantor are further discussed in Note 19 on Commitments, Contingencies and Guarantees.    

Under its program to sell residential mortgage loans in the secondary market, the Company designates certain newly-originated residential mortgage loans as held for sale. Derivative instruments arising from this activity include mortgage loan commitments and forward loan sale contracts. Changes in the fair values of the loan commitments and funded loans prior to sale that are due to changes in interest rates are economically hedged with forward contracts to sell residential mortgage-backed securities in the to-be-announced (TBA) market. These forward TBA contracts are also considered to be derivatives and are settled in cash at the security settlement date.

The fair values of the Company’s derivative instruments are shown in the table below. Information about the valuation methods used to measure fair value is provided in Note 15 on Fair Value Measurements. Derivative instruments with a positive fair value (asset derivatives) are reported in other assets in the consolidated balance sheets while derivative instruments with a negative fair value (liability derivatives) are reported in other liabilities in the consolidated balance sheets. As mentioned in Note 15, effective January 2017, certain collateral posted to and from the Company's clearing counterparty has been offset against the fair values of cleared swaps, such that at December 31, 2017, the positive fair values of cleared swaps were reduced by $4.5 million and the negative fair values of cleared swaps were reduced by $4.3 million, as reflected in the table below.        

	Asset Derivatives				Liability Derivatives
	December 31				December 31
	2017		2016		2017			2016
(In thousands)	Fair Value				Fair Value
Derivative instruments:
Interest rate swaps	$	7,674	$	12,987	$	(7,857	)	$	(12,987	)
Interest rate caps	16		78		(16		)	(78		)
Credit risk participation agreements	46		65		(123		)	(156		)
Foreign exchange contracts	21		66		(40		)	(4		)
Mortgage loan commitments	580		355		—			(6		)
Mortgage loan forward sale contracts	8		—		(7		)	(63		)
Forward TBA contracts	4		15		(31		)	(45		)
Total	$	8,349	$	13,566	$	(8,074	)	$	(13,339	)

The effects of derivative instruments on the consolidated statements of income are shown in the table below.

	Location of Gain or (Loss) Recognized in Income on Derivative	Amount of Gain or (Loss) Recognized in Income on Derivative
		For the Years Ended December 31
(In thousands)		2017			2016			2015
Derivative instruments:
Interest rate swaps	Other non-interest income	$	1,978		$	5,927		$	4,309
Interest rate caps	Other non-interest income	—			—			32
Credit risk participation agreements	Other non-interest income	35			(44		)	57
Foreign exchange contracts:	Other non-interest income	(80		)	55			253
Mortgage loan commitments	Loan fees and sales	231			87			263
Mortgage loan forward sale contracts	Loan fees and sales	64			(63		)	—
Forward TBA contracts	Loan fees and sales	(648		)	79			82
Total		$	1,580		$	6,041		$	4,996

The following table shows the extent to which assets and liabilities relating to derivative instruments have been offset in the consolidated balance sheets. It also provides information about these instruments which are subject to an enforceable master netting arrangement, irrespective of whether they are offset, and the extent to which the instruments could potentially be offset. Also shown is collateral received or pledged in the form of other financial instruments, which is generally cash or marketable securities. The collateral amounts in this table are limited to the outstanding balance of the related asset or liability (after netting is applied); thus amounts of excess collateral are not shown. Most of the derivatives in the following table were transacted under master netting arrangements that contain a conditional right of offset, such as close-out netting, upon default.

The Company is party to master netting arrangements with most of its swap derivative counterparties; however, the Company does not offset derivative assets and liabilities under these arrangements on its consolidated balance sheet. Collateral, usually in the form of marketable securities, is exchanged between the Company and dealer bank counterparties and is generally subject to thresholds and transfer minimums. By contract, it may be sold or re-pledged by the secured party until recalled at a subsequent valuation date by the pledging party. For those swap transactions requiring central clearing, the Company posts cash and securities to its clearing agency. Collateral positions are valued daily, and adjustments to amounts received and pledged by the Company are made as appropriate to maintain proper collateralization for these transactions. Swap derivative transactions with customers are generally secured by rights to non-financial collateral, such as real and personal property, which is not shown in the table below.

							Gross Amounts Not Offset in the Balance Sheet
(In thousands)	Gross Amount Recognized		Gross Amounts Offset in the Balance Sheet		Net Amounts Presented in the Balance Sheet		Financial Instruments Available for Offset			Collateral Received/Pledged			Net Amount
December 31, 2017
Assets:
Derivatives subject to master netting agreements	$	7,726	$	—	$	7,726	$	(233	)	$	(824	)	$	6,669
Derivatives not subject to master netting agreements	623		—		623
Total derivatives	8,349		—		8,349
Liabilities:
Derivatives subject to master netting agreements	7,935		—		7,935		(233		)	(1,570		)	6,132
Derivatives not subject to master netting agreements	139		—		139
Total derivatives	8,074		—		8,074
December 31, 2016
Assets:
Derivatives subject to master netting agreements	$	13,111	$	—	$	13,111	$	(3,391	)	$	—		$	9,720
Derivatives not subject to master netting agreements	455		—		455
Total derivatives	13,566		—		13,566
Liabilities:
Derivatives subject to master netting agreements	13,124		—		13,124		(3,391		)	(5,292		)	4,441
Derivatives not subject to master netting agreements	215		—		215
Total derivatives	13,339		—		13,339

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Resale and Repurchase Agreements Resale and Repurchase Agreements

12 Months Ended

Dec. 31, 2017

Offsetting [Abstract]

Resale and Repurchase Agreements [Text Block]

Resale and Repurchase Agreements

The following table shows the extent to which assets and liabilities relating to securities purchased under agreements to resell (resale agreements) and securities sold under agreements to repurchase (repurchase agreements) have been offset in the consolidated balance sheets, in addition to the extent to which they could potentially be offset. Also shown is collateral received or pledged, which consists of marketable securities. The collateral amounts in the table are limited to the outstanding balances of the related asset or liability (after netting is applied); thus amounts of excess collateral are not shown. The agreements in the following table were transacted under master netting arrangements that contain a conditional right of offset, such as close-out netting, upon default.

Resale and repurchase agreements are agreements to purchase/sell securities subject to an obligation to resell/repurchase the same or similar securities. They are accounted for as collateralized financing transactions, not as sales and purchases of the securities portfolio. The securities collateral accepted or pledged in resale and repurchase agreements with other financial institutions also may be sold or re-pledged by the secured party, but is usually delivered to and held by third party trustees. The Company generally retains custody of securities pledged for repurchase agreements with customers.

The Company is party to several agreements commonly known as collateral swaps. These agreements involve the exchange of collateral under simultaneous repurchase and resale agreements with the same financial institution counterparty. These repurchase and resale agreements have the same principal amounts, inception dates, and maturity dates and have been offset against each other in the balance sheet, having met the accounting requirements for this treatment. The collateral swaps totaled $650.0 million at December 31, 2017 and $550.0 million at December 31, 2016. At December 31, 2017, the Company had posted collateral of $661.4 million in marketable securities, consisting of agency mortgage-backed bonds and treasuries, and had accepted $661.3 million in investment grade asset-backed, commercial mortgage-backed, and corporate bonds.

								Gross Amounts Not Offset in the Balance Sheet
(In thousands)	Gross Amount Recognized		Gross Amounts Offset in the Balance Sheet			Net Amounts Presented in the Balance Sheet		Financial Instruments Available for Offset		Securities Collateral Received/Pledged			Net Amount
December 31, 2017
Total resale agreements, subject to master netting arrangements	$	1,350,000	$	(650,000	)	$	700,000	$	—	$	(700,000	)	$	—
Total repurchase agreements, subject to master netting arrangements	1,954,768		(650,000		)	1,304,768		—		(1,304,768		)	—
December 31, 2016
Total resale agreements, subject to master netting arrangements	$	1,275,000	$	(550,000	)	$	725,000	$	—	$	(725,000	)	$	—
Total repurchase agreements, subject to master netting arrangements	2,221,065		(550,000		)	1,671,065		—		(1,671,065		)	—

The table below shows the remaining contractual maturities of repurchase agreements outstanding at December 31, 2017 and 2016, in addition to the various types of marketable securities that have been pledged as collateral for these borrowings.

	Remaining Contractual Maturity of the Agreements
(In thousands)	Overnight and continuous		Up to 90 days		Greater than 90 days		Total
December 31, 2017
Repurchase agreements, secured by:
U.S. government and federal agency obligations	$	271,820	$	1,731	$	450,000	$	723,551
Government-sponsored enterprise obligations	149,111		—		—		149,111
Agency mortgage-backed securities	737,975		9,750		200,000		947,725
Asset-backed securities	89,601		30,000		—		119,601
Other debt securities	14,780		—		—		14,780
Total repurchase agreements, gross amount recognized	$	1,263,287	$	41,481	$	650,000	$	1,954,768
December 31, 2016
Repurchase agreements, secured by:
U.S. government and federal agency obligations	$	294,600	$	—	$	300,000	$	594,600
Government-sponsored enterprise obligations	147,694		—		3,237		150,931
Agency mortgage-backed securities	693,851		24,380		252,473		970,704
Asset-backed securities	474,830		30,000		—		504,830
Total repurchase agreements, gross amount recognized	$	1,610,975	$	54,380	$	555,710	$	2,221,065

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Commitments, Contingencies And Guarantees

12 Months Ended

Dec. 31, 2017

Commitments and Contingencies Disclosure [Abstract]

Commitments, Contingencies And Guarantees

Commitments, Contingencies and Guarantees

The Company leases certain premises and equipment, all of which were classified as operating leases. The rent expense under such arrangements amounted to $7.3 million, $7.1 million and $6.8 million in 2017, 2016 and 2015, respectively. A summary of minimum lease commitments follows:

(In thousands)	Type of Property
Year Ended December 31	Real Property		Equipment		Total
2018	$	5,981	$	215	$	6,196
2019	4,876		75		4,951
2020	3,861		32		3,893
2021	3,162		14		3,176
2022	2,678		—		2,678
After	13,383		—		13,383
Total minimum lease payments					$	34,277

All leases expire prior to 2052. It is expected that in the normal course of business, leases that expire will be renewed or replaced by leases on other properties; thus, the future minimum lease commitments are not expected to be less than the amounts shown for 2018.

The Company engages in various transactions and commitments with off-balance sheet risk in the normal course of business to meet customer financing needs. The Company uses the same credit policies in making the commitments and conditional obligations described below as it does for on-balance sheet instruments. The following table summarizes these commitments at December 31:

(In thousands)	2017		2016
Commitments to extend credit:
Credit card	$	5,102,556	$	4,932,955
Other	5,737,181		5,508,686
Standby letters of credit, net of participations	387,811		391,899
Commercial letters of credit	4,498		2,962

Commitments to extend credit are legally binding agreements to lend to a borrower providing there are no violations of any conditions established in the contract. As many of the commitments are expected to expire without being drawn upon, the total commitment does not necessarily represent future cash requirements. Refer to Note 2 on Loans and Allowance for Loan Losses for further discussion.

Commercial letters of credit act as a means of ensuring payment to a seller upon shipment of goods to a buyer. The majority of commercial letters of credit issued are used to settle payments in international trade. Typically, letters of credit require presentation of documents which describe the commercial transaction, evidence shipment, and transfer title.

The Company, as a provider of financial services, routinely issues financial guarantees in the form of financial and performance standby letters of credit. Standby letters of credit are contingent commitments issued by the Company generally to guarantee the payment or performance obligation of a customer to a third party. While these represent a potential outlay by the Company, a significant amount of the commitments may expire without being drawn upon. The Company has recourse against the customer for any amount it is required to pay to a third party under a standby letter of credit. The letters of credit are subject to the same credit policies, underwriting standards and approval process as loans made by the Company. Most of the standby letters of credit are secured, and in the event of nonperformance by the customer, the Company has rights to the underlying collateral, which could include commercial real estate, physical plant and property, inventory, receivables, cash and marketable securities.

At December 31, 2017, the Company had recorded a liability in the amount of $2.5 million, representing the carrying value of the guarantee obligations associated with the standby letters of credit. This amount will be accreted into income over the remaining life of the respective commitments. Commitments outstanding under these letters of credit, which represent the maximum potential future payments guaranteed by the Company, were $387.8 million at December 31, 2017.

The Company regularly purchases various state tax credits arising from third-party property redevelopment. These credits are either resold to third parties or retained for use by the Company. During 2017, purchases and sales of tax credits amounted to $70.9 million and $47.1 million, respectively. At December 31, 2017, the Company had outstanding purchase commitments totaling $114.9 million that it expects to fund in 2018.

The Company periodically enters into risk participation agreements (RPAs) as a guarantor to other financial institutions, in order to mitigate those institutions’ credit risk associated with interest rate swaps with third parties. The RPA stipulates that, in the event of default by the third party on the interest rate swap, the Company will reimburse a portion of the loss borne by the financial institution. These interest rate swaps are normally collateralized (generally with real property, inventories and equipment) by the third party, which limits the credit risk associated with the Company’s RPAs. The third parties usually have other borrowing relationships with the Company. The Company monitors overall borrower collateral, and at December 31, 2017, believes sufficient collateral is available to cover potential swap losses. The RPAs are carried at fair value throughout their term, with all changes in fair value, including those due to a change in the third party’s creditworthiness, recorded in current earnings. The terms of the RPAs, which correspond to the terms of the underlying swaps, range from 2 to 11 years. At December 31, 2017, the fair value of the Company's guarantee liability RPAs was $123 thousand, and the notional amount of the underlying swaps was $84.1 million. The maximum potential future payment guaranteed by the Company cannot be readily estimated and is dependent upon the fair value of the interest rate swaps at the time of default.

The Company has various legal proceedings pending at December 31, 2017, arising in the normal course of business. While some matters pending against the Company specify damages claimed by plaintiffs, others do not seek a specified amount of damages or are at very early stages of the legal process. The Company records a loss accrual for all legal and regulatory matters for which it deems a loss is probable and can be reasonably estimated. Some matters, which are in the early stages, have not yet progressed to the point where a loss amount can be determined to be probable and estimable.

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Related Parties

12 Months Ended

Dec. 31, 2017

Related Party Transactions [Abstract]

Related Parties

Related Parties

The Company’s Chief Executive Officer, its Vice Chairman, and its President are directors of Tower Properties Company (Tower) and, together with members of their immediate families, beneficially own approximately 66% of the outstanding stock of Tower. At December 31, 2017, Tower owned 270,646 shares of Company stock. Tower is primarily engaged in the business of owning, developing, leasing and managing real property.

Payments from the Company and its affiliates to Tower are summarized below. These payments, with the exception of dividend payments, relate to property management services, including construction oversight, on three Company-owned office buildings and related parking garages in downtown Kansas City.

(In thousands)	2017		2016		2015
Leasing agent fees	$	32	$	101	$	66
Operation of parking garages	82		184		75
Building management fees	1,954		1,832		1,850
Property construction management fees	146		147		322
Dividends paid on Company stock held by Tower	232		221		210
Total	$	2,446	$	2,485	$	2,523

Tower has a $13.5 million line of credit with the Bank which is subject to normal credit terms and has a variable interest rate. The line of credit is collateralized by Company stock and based on collateral value had a maximum borrowing amount of approximately $11.5 million at December 31, 2017. There were $5.2 million of borrowings under this line during 2017, and there was no balance outstanding at December 31, 2017. There were no borrowings outstanding during 2016, and the maximum borrowings outstanding during 2015 were $1.3 million. There was no balance outstanding at December 31, 2016 or 2015. Interest paid on these borrowings during the last three years was not significant. Letters of credit may be collateralized under this line of credit; however, there were no letters of credit outstanding during 2017, 2016 or 2015, and thus, no fees were received during these periods. From time to time, the Bank extends additional credit to Tower for construction and development projects. No construction loans were outstanding during 2017, 2016 and 2015.

Tower leases office space in the Kansas City bank headquarters building owned by the Company. Rent paid to the Company totaled $74 thousand in 2017, $72 thousand in 2016, and $69 thousand in 2015, at $15.75, $15.67 and $15.42 per square foot, respectively.

Directors of the Company and their beneficial interests have deposit accounts with the Bank and may be provided with cash management and other banking services, including loans, in the ordinary course of business. Such loans were made on substantially the same terms, including interest rates and collateral, as those prevailing at the time for comparable transactions with other unrelated persons and did not involve more than the normal risk of collectability.

As discussed in Note 19 on Commitments, Contingencies, and Guarantees, the Company regularly purchases various state tax credits arising from third-party property redevelopment and resells the credits to third parties.  During 2017, the Company sold state tax credits to its Chief Executive Officer, its Vice Chairman, and its President, in the amount of $694 thousand, $598 thousand, and $67 thousand, respectively, for personal tax planning. During 2016, the Company sold state tax credits to its Chief Executive Officer, his father (a former Chief Executive Officer), its Vice Chairman, and its President, in the amount of $549 thousand, $191 thousand, $244 thousand, and $72 thousand, respectively. During 2015, the Company sold state tax credits to its Chief Executive Officer, his father, its Vice Chairman, and its President in the amount of $478 thousand, $40 thousand, $372 thousand, and $65 thousand, respectively. The terms of the sales and the amounts paid were the same as the terms and amounts paid for similar tax credits by persons not related to the Company.

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Parent Company Condensed Financial Statements

12 Months Ended

Dec. 31, 2017

Condensed Financial Information of Parent Company Only Disclosure [Abstract]

Parent Company Condensed Financial Statements

Parent Company Condensed Financial Statements

Following are the condensed financial statements of Commerce Bancshares, Inc. (Parent only) for the periods indicated:

Condensed Balance Sheets
	December 31
(In thousands)	2017		2016
Assets
Investment in consolidated subsidiaries:
Bank	$	2,409,098	$	2,246,060
Non-banks	52,479		51,816
Cash	151,607		51
Securities purchased under agreements to resell	—		155,775
Investment securities:
Available for sale	53,285		58,051
Non-marketable	655		718
Note receivable due from bank subsidiary	50,000		—
Advances to subsidiaries, net of borrowings	14,571		5,053
Income tax benefits	8,279		524
Other assets	19,951		17,716
Total assets	$	2,759,925	$	2,535,764
Liabilities and stockholders’ equity
Pension obligation	$	12,407	$	17,158
Other liabilities	30,958		22,823
Total liabilities	43,365		39,981
Stockholders’ equity	2,716,560		2,495,783
Total liabilities and stockholders’ equity	$	2,759,925	$	2,535,764

Condensed Statements of Income
	For the Years Ended December 31
(In thousands)	2017			2016			2015
Income
Dividends received from consolidated bank subsidiary	$	160,002		$	160,002		$	160,001
Earnings of consolidated subsidiaries, net of dividends	147,678			118,704			106,636
Interest and dividends on investment securities	2,099			2,364			2,272
Management fees charged to subsidiaries	30,431			30,965			25,713
Investment securities gains	41,717			1,880			—
Net interest income on advances and note to subsidiaries	514			21			4
Other	3,346			2,720			1,422
Total income	385,787			316,656			296,048
Expense
Salaries and employee benefits	33,714			29,116			22,167
Professional fees	2,036			1,951			1,833
Data processing fees paid to affiliates	3,512			3,226			3,186
Community service	32,093			1,620			991
Other	10,671			9,849			8,278
Total expense	82,026			45,762			36,455
Income tax benefit	(15,622		)	(4,497		)	(4,137		)
Net income	$	319,383		$	275,391		$	263,730

Condensed Statements of Cash Flows
	For the Years Ended December 31
(In thousands)	2017			2016			2015
Operating Activities
Net income	$	319,383		$	275,391		$	263,730
Adjustments to reconcile net income to net cash provided by operating activities:
Earnings of consolidated subsidiaries, net of dividends	(147,678		)	(118,704		)	(106,636		)
Other adjustments, net	(11,268		)	9,541			(1,152		)
Net cash provided by operating activities	160,437			166,228			155,942
Investing Activities
(Increase) decrease in securities purchased under agreements to resell	155,775			(51,335		)	57,210
(Increase) decrease in investment in subsidiaries, net	11			4			(6		)
Proceeds from sales of investment securities	11,006			2,949			—
Proceeds from maturities/pay downs of investment securities	2,295			4,105			3,516
Purchases of investment securities	—			—			(2,500		)
Note receivable due from bank subsidiary	(50,000		)	—			—
(Increase) decrease in advances to subsidiaries, net	(9,518		)	13,507			1,171
Net purchases of building improvements and equipment	(52		)	(3		)	(113		)
Net cash provided by (used in) investing activities	109,517			(30,773		)	59,278
Financing Activities
Purchases of treasury stock	(17,771		)	(39,381		)	(23,176		)
Accelerated share repurchase agreements	—			—			(100,000		)
Issuance of stock under equity compensation plans	(8		)	(6		)	1,914
Cash dividends paid on common stock	(91,619		)	(87,070		)	(84,961		)
Cash dividends paid on preferred stock	(9,000		)	(9,000		)	(9,000		)
Net cash used in financing activities	(118,398		)	(135,457		)	(215,223		)
Increase (decrease) in cash	151,556			(2		)	(3		)
Cash at beginning of year	51			53			56
Cash at end of year	$	151,607		$	51		$	53
Income tax payments (receipts), net	$	(8,991	)	$	(8,958	)	$	1,278

Dividends paid by the Parent to its shareholders were substantially provided from Bank dividends. The Bank may distribute common dividends without prior regulatory approval, provided that the dividends do not exceed the sum of net income for the current year and retained net income for the preceding two years, subject to maintenance of minimum capital requirements. The Parent charges fees to its subsidiaries for management services provided, which are allocated to the subsidiaries based primarily on total average assets. The Parent makes cash advances to its private equity subsidiaries for general short-term cash flow purposes. Advances may be made to the Parent by its subsidiary bank holding company for temporary investment of idle funds. Interest on such advances is based on market rates.

In 2017, the Bank borrowed $50.0 million from the Parent as part of its strategy to reduce FDIC insurance premiums. The note has a rolling 13 month maturity, and the interest rate is a variable rate equal to the one year treasury rate.

For the past several years, the Parent has maintained a $20.0 million line of credit for general corporate purposes with the Bank. The line of credit is secured by investment securities. The Parent has not borrowed under this line during the past three years.

At December 31, 2017, the fair value of available for sale investment securities held by the Parent consisted of investments of $48.7 million in common and preferred stock and $4.6 million in non-agency mortgage-backed securities. The Parent’s unrealized net gain in fair value on its investments was $44.5 million at December 31, 2017. The corresponding net of tax unrealized gain included in the equity category of accumulated other comprehensive income was $27.6 million. Also included in accumulated other comprehensive income was an unrealized net of tax gain in fair value of investment securities held by subsidiaries, which amounted to $6.2 million at December 31, 2017.

During 2017, the Parent contributed appreciated common stock to a charitable foundation and recorded securities gains of $31.1 million and expense of $32.0 million in these transactions. The Parent also sold holdings of the same investment during the fourth quarter of 2017 for a total gain of $10.0 million. The Parent's remaining holdings of this stock, with a fair value of $45.9 million at December 31, 2017, are expected to be redeemed for cash in a third party merger transaction expected to occur in the first six months of 2018. The Company adopted new accounting guidance on January 1, 2018 which reclassified the unrealized gain in fair value on these holdings (net of tax) to retained earnings, as discussed in the Financial Instruments section on page 52.

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Summary of Significant Accounting Policies (Policy)

12 Months Ended

Dec. 31, 2017

Accounting Policies [Abstract]

Nature Of Operations

Nature of Operations

Commerce Bancshares, Inc. and its subsidiaries (the Company) conducts its principal activities from approximately 330 locations throughout Missouri, Illinois, Kansas, Oklahoma and Colorado. Principal activities include retail and commercial banking, investment management, securities brokerage, mortgage banking, credit related insurance and private equity investment activities.

Basis Of Presentation

Basis of Presentation

The Company follows accounting principles generally accepted in the United States of America (GAAP) and reporting practices applicable to the banking industry. The preparation of financial statements under GAAP requires management to make estimates and assumptions that affect the amounts reported in the financial statements and notes. These estimates are based on information available to management at the time the estimates are made. While the consolidated financial statements reflect management’s best estimates and judgments, actual results could differ from those estimates. The consolidated financial statements include the accounts of the Company and its majority-owned subsidiaries (after elimination of all material intercompany balances and transactions). Certain prior year amounts have been reclassified to conform to the current year presentation. Such reclassifications had no effect on net income or total assets. Management has evaluated subsequent events for potential recognition or disclosure through the date these consolidated financial statements were issued.

The Company, in the normal course of business, engages in a variety of activities that involve variable interest entities (VIEs). A VIE is a legal entity that lacks equity investors or whose equity investors do not have a controlling financial interest in the entity through their equity investments. However, an enterprise is deemed to have a controlling financial interest and is the primary beneficiary of a VIE if it has both the power to direct the activities of the VIE that most significantly impact the VIE’s economic performance and an obligation to absorb losses or the right to receive benefits that could potentially be significant to the VIE. An enterprise that is the primary beneficiary must consolidate the VIE. The Company’s interests in VIEs are evaluated to determine if the Company is the primary beneficiary both at inception and when there is a change in circumstances that requires a reconsideration.

The Company is considered to be the primary beneficiary in a rabbi trust related to a deferred compensation plan offered to certain employees. The assets and liabilities of this trust, which are included in the accompanying consolidated balance sheets, are not significant. The Company also has variable interests in certain entities in which it is not the primary beneficiary. These entities are not consolidated. These interests include affordable housing limited partnership interests, holdings in its investment portfolio of various asset and mortgage-backed bonds that are issued by securitization trusts, and managed discretionary trust assets that are not included in the accompanying consolidated balance sheets.

Cash And Cash Equivalents

Cash and Cash Equivalents

In the accompanying consolidated statements of cash flows, cash and cash equivalents include “Cash and due from banks”, “Federal funds sold and short-term securities purchased under agreements to resell”, and “Interest earning deposits with banks” as segregated in the accompanying consolidated balance sheets.

Regulations of the Federal Reserve System require cash balances to be maintained at the Federal Reserve Bank, based on certain deposit levels. The minimum reserve requirement for the Bank at December 31, 2017 totaled $126.1 million, while cash held at the Federal Reserve Bank totaled $30.6 million. Additionally, as of December 31, 2017, the Company had $12.5 million in cash collateral on deposit with another financial institution relating to interest rate swap transactions.

Loans And Related Earnings

Loans and Related Earnings

Loans that management has the intent and ability to hold for the foreseeable future or until maturity or pay-off are reported at their outstanding principal balances, net of undisbursed loan proceeds, the allowance for loan losses, and any deferred fees and costs on originated loans. Origination fee income received on loans and amounts representing the estimated direct costs of origination are deferred and amortized to interest income over the life of the loan using the interest method.

Interest on loans is accrued based upon the principal amount outstanding. Interest income is recognized primarily on the level yield method. Loan and commitment fees, net of costs, are deferred and recognized in income over the term of the loan or commitment as an adjustment of yield. Annual fees charged on credit card loans are capitalized to principal and amortized over 12 months to loan fees and sales. Other credit card fees, such as cash advance fees and late payment fees, are recognized in income as an adjustment of yield when charged to the cardholder’s account.

Non-Accrual Loans

Non-Accrual Loans

Loans are placed on non-accrual status when management does not expect to collect payments consistent with acceptable and agreed upon terms of repayment. Business, construction real estate, business real estate, and personal real estate loans that are contractually 90 days past due as to principal and/or interest payments are generally placed on non-accrual, unless they are both well-secured and in the process of collection. Consumer, revolving home equity and credit card loans are exempt under regulatory rules from being classified as non-accrual. When a loan is placed on non-accrual status, any interest previously accrued but not collected is reversed against current income, and the loan is charged off to the extent uncollectible. Principal and interest payments received on non-accrual loans are generally applied to principal.Interest is included in income only after all previous loan charge-offs have been recovered and is recorded only as received. The loan is returned to accrual status only when the borrower has brought all past due principal and interest payments current, and, in the opinion of management, the borrower has demonstrated the ability to make future payments of principal and interest as scheduled. A six month history of sustained payment performance is generally required before reinstatement of accrual status.

Restructured Loans

Restructured Loans

A loan is accounted for as a troubled debt restructuring if the Company, for economic or legal reasons related to the borrowers’ financial difficulties, grants a concession to the borrower that it would not otherwise consider. A troubled debt restructuring typically involves (1) modification of terms such as a reduction of the stated interest rate, loan principal, or accrued interest, (2) a loan renewal at a stated interest rate lower than the current market rate for a new loan with similar risk, or (3) debt that was not reaffirmed in bankruptcy. Business, business real estate, construction real estate and personal real estate troubled debt restructurings with impairment charges are placed on non-accrual status. The Company measures the impairment loss of a troubled debt restructuring in the same manner as described below. Troubled debt restructurings which are performing under their contractual terms continue to accrue interest which is recognized in current earnings.

Impaired Loans

Impaired Loans

Loans are evaluated regularly by management for impairment. Included in impaired loans are all non-accrual loans, as well as loans that have been classified as troubled debt restructurings. Once a loan has been identified as impaired, impairment is measured based on either the present value of the expected future cash flows at the loan’s initial effective interest rate or the fair value of the collateral if collateral dependent. Factors considered in determining impairment include delinquency status, cash flow analysis, credit analysis, and collateral value and availability.

Loans Held For Sale

Loans Held For Sale

Loans held for sale include student loans and certain fixed rate residential mortgage loans. These loans are typically classified as held for sale upon origination based upon management's intent to sell the production of these loans. The student loans are carried at the lower of aggregate cost or fair value, and their fair value is determined based on sale contract prices. The mortgage loans are carried at fair value under the elected fair value option. Their fair value is based on secondary market prices for loans with similar characteristics, including an adjustment for embedded servicing value. Changes in fair value and gains and losses on sales are included in loan fees and sales. Deferred fees and costs related to these loans are not amortized but are recognized as part of the cost basis of the loan at the time it is sold. Interest income related to loans held for sale is accrued based on the principal amount outstanding and the loan's contractual interest rate.

Occasionally, other types of loans may be classified as held for sale in order to manage credit concentration. These loans are carried at the lower of cost or fair value with gains and losses on sales recognized in loan fees and sales.

Allowance/Provision For Loan Losses

Allowance/Provision for Loan Losses

The allowance for loan losses is maintained at a level believed to be appropriate by management to provide for probable loan losses inherent in the portfolio as of the balance sheet date, including losses on known or anticipated problem loans as well as for loans which are not currently known to require specific allowances. Management has established a process to determine the amount of the allowance for loan losses which assesses the risks and losses inherent in its portfolio. Business, construction real estate and business real estate loans are normally larger and more complex, and their collection rates are harder to predict. These loans are more likely to be collateral dependent and are allocated a larger reserve, due to their potential volatility. Personal real estate, credit card, consumer and revolving home equity loans are individually smaller and perform in a more homogenous manner, making loss estimates more predictable. Management’s process provides an allowance consisting of a specific allowance component based on certain individually evaluated loans and a general component based on estimates of reserves needed for pools of loans.

Loans subject to individual evaluation generally consist of business, construction real estate, business real estate and personal real estate loans on non-accrual status. These impaired loans are evaluated individually for the impairment of repayment potential and collateral adequacy. Other impaired loans identified as performing troubled debt restructurings are collectively evaluated because they have similar risk characteristics. Loans which have not been identified as impaired are segregated by loan type and sub-type and are collectively evaluated. Reserves calculated for these loan pools are estimated using a consistent methodology that considers historical loan loss experience by loan type, loss emergence periods, delinquencies, current economic factors, loan risk ratings and industry concentrations.

The Company’s estimate of the allowance for loan losses and the corresponding provision for loan losses is based on various judgments and assumptions made by management. The amount of the allowance for loan losses is influenced by several qualitative factors which include collateral valuation, evaluation of performance and status, current loan portfolio composition and characteristics, trends in delinquencies, portfolio risk ratings, levels of non-performing assets, and prevailing regional and national economic and business conditions.

The estimates, appraisals, evaluations, and cash flows utilized by management may be subject to frequent adjustments due to changing economic prospects of borrowers or properties. These estimates are reviewed periodically and adjustments, if necessary, are recorded in the provision for loan losses in the periods in which they become known.

Loans, or portions of loans, are charged off to the extent deemed uncollectible. Loan charge-offs reduce the allowance for loan losses, and recoveries of loans previously charged off are added back to the allowance. Business, business real estate, construction real estate and personal real estate loans are generally charged down to estimated collectible balances when they are placed on non-accrual status. Consumer loans and related accrued interest are normally charged down to the fair value of related collateral (or are charged off in full if no collateral) once the loans are more than 120 days delinquent. Credit card loans are charged off against the allowance for loan losses when the receivable is more than 180 days past due. The interest and fee income previously capitalized but not collected on credit card charge-offs is reversed against interest income.

Operating, Direct Financing And Sales Type Leases

Operating, Direct Financing and Sales Type Leases

The net investment in direct financing and sales type leases is included in loans on the Company’s consolidated balance sheets and consists of the present values of the sum of the future minimum lease payments and estimated residual value of the leased asset. Revenue consists of interest earned on the net investment and is recognized over the lease term as a constant percentage return thereon. The net investment in operating leases is included in other assets on the Company’s consolidated balance sheets. It is carried at cost, less the amount depreciated to date. Depreciation is recognized, on the straight-line basis, over the lease term to the estimated residual value. Operating lease revenue consists of the contractual lease payments and is recognized over the lease term in other non-interest income. Estimated residual values are established at lease inception utilizing contract terms, past customer experience, and general market data and are reviewed and adjusted, if necessary, on an annual basis.

Investments In Debt And Equity Securities

Investments in Debt and Equity Securities

The Company has classified the majority of its investment portfolio as available for sale. From time to time, the Company sells securities and utilizes the proceeds to reduce borrowings, fund loan growth, or modify its interest rate profile. Securities classified as available for sale are carried at fair value. Changes in fair value, excluding certain losses associated with other-than-temporary impairment (OTTI), are reported in other comprehensive income (loss), a component of stockholders’ equity. Securities are periodically evaluated for OTTI in accordance with guidance provided in ASC 320-10-35. For securities with OTTI, the entire loss in fair value is required to be recognized in current earnings if the Company intends to sell the securities or believes it likely that it will be required to sell the security before the anticipated recovery. If neither condition is met, but the Company does not expect to recover the amortized cost basis, the Company determines whether a credit loss has occurred, and the loss is then recognized in current earnings. The noncredit-related portion of the overall loss is reported in other comprehensive income (loss). Gains and losses realized upon sales of securities are calculated using the specific identification method and are included in investment securities gains (losses), net, in the consolidated statements of income. Purchase premiums and discounts are amortized to interest income using a level yield method over the estimated lives of the securities. For mortgage and asset-backed securities, prepayment experience is evaluated quarterly to determine the appropriate estimate of the future rate of prepayment. When a change in a bond's estimated remaining life is necessary, a corresponding adjustment is made in the related amortization of premium or discount accretion.

Non-marketable securities include certain private equity investments, consisting of both debt and equity instruments. These securities are carried at fair value in accordance with ASC 946-10-15, with changes in fair value reported in current earnings. In the absence of readily ascertainable market values, fair value is estimated using internally developed models. Changes in fair value and gains and losses from sales are included in investment securities gains (losses), net in the consolidated statements of income. Other non-marketable securities acquired for debt and regulatory purposes are carried at cost and periodically evaluated for other-than-temporary impairment.

Trading account securities, which are bought and held principally for the purpose of resale in the near term, are carried at fair value. Gains and losses, both realized and unrealized, are recorded in non-interest income.

Purchases and sales of securities are recognized on a trade date basis. A receivable or payable is recognized for pending transaction settlements.

Securities Purchased Under Agreements To Resell And Securities Sold Under Agreements To Repurchase

Securities Purchased under Agreements to Resell and Securities Sold under Agreements to Repurchase

Securities purchased under agreements to resell and securities sold under agreements to repurchase are treated as collateralized financing transactions, not as purchases and sales of the underlying securities. The agreements are recorded at the amount of cash advanced or received.

The Company periodically enters into securities purchased under agreements to resell with large financial institutions. Securities pledged by the counterparties to secure these agreements are delivered to a third party custodian.

Securities sold under agreements to repurchase are a source of funding to the Company and are offered to cash management customers as an automated, collateralized investment account. From time to time, securities sold may also be used by the Bank to obtain additional borrowed funds at favorable rates. These borrowings are secured by a portion of the Company's investment security portfolio and delivered either to the dealer custody account at the FRB or to the applicable counterparty.

The fair value of collateral either received from or provided to a counterparty is monitored daily, and additional collateral is obtained, returned, or provided by the Company in order to maintain full collateralization for these transactions.

As permitted by current accounting guidance, the Company offsets certain securities purchased under agreements to resell against securities sold under agreements to repurchase in its balance sheet presentation. These agreements are further discussed in Note 18, Resale and Repurchase Agreements.

Land, Buildings And Equipment

Land, Buildings and Equipment

Land is stated at cost, and buildings and equipment are stated at cost, including capitalized interest when appropriate, less accumulated depreciation. Depreciation is computed using a straight-line method, utilizing estimated useful lives; generally 30 years for buildings, 10 years for building improvements, and 3 to 10 years for equipment. Leasehold improvements are amortized over the shorter of 10 years or the remaining lease term. Maintenance and repairs are charged to non-interest expense as incurred.

Foreclosed Assets

Foreclosed Assets

Foreclosed assets consist of property that has been repossessed and is comprised of commercial and residential real estate and other non-real estate property, including auto and recreational and marine vehicles. The assets are initially recorded at fair value less estimated selling costs, establishing a new cost basis. Initial valuation adjustments are charged to the allowance for loan losses. Fair values are estimated primarily based on appraisals, third-party price opinions, or internally developed pricing models. After initial recognition, fair value estimates are updated periodically. Declines in fair value below cost are recognized through valuation allowances which may be reversed when supported by future increases in fair value. These valuation adjustments, in addition to gains and losses realized on sales and net operating expenses, are recorded in other non-interest expense.

Goodwill and Intangible Assets

Goodwill and Intangible Assets

Goodwill is not amortized but is assessed for impairment on an annual basis or more frequently in certain circumstances. When testing for goodwill impairment, the Company may initially perform a qualitative assessment. Based on the results of this qualitative assessment, if the Company concludes it is more likely than not that a reporting unit's fair value is less than its carrying amount, a quantitative analysis is performed. Quantitative valuation methodologies include a combination of formulas using current market multiples, based on recent sales of financial institutions within the Company's geographic marketplace. If the fair value of a reporting unit is less than the carrying amount, additional analysis is required to measure the amount of impairment. The Company has not recorded impairment resulting from goodwill impairment tests. However, adverse changes in the economic environment, operations of the reporting unit, or other factors could result in a decline in fair value.

Intangible assets that have finite useful lives, such as core deposit intangibles and mortgage servicing rights, are amortized over their estimated useful lives. Core deposit intangibles are amortized over periods of 8 to 14 years, representing their estimated lives, using accelerated methods. Mortgage servicing rights are amortized in proportion to and over the period of estimated net servicing income, considering appropriate prepayment assumptions. Core deposit intangibles are reviewed for impairment whenever events or changes in circumstances indicate their carrying amount may not be recoverable. Impairment is indicated if the sum of the undiscounted estimated future net cash flows is less than the carrying value of the intangible asset. Mortgage servicing rights, while initially recorded at fair value, are subsequently amortized and carried at the lower of the initial capitalized amount (net of accumulated amortization), or estimated fair value. The Company evaluates its mortgage servicing rights for impairment on a quarterly basis, using estimated prepayment speeds of the underlying mortgage loans serviced and stratifications based on the risk characteristics of the underlying loans. A valuation allowance has been established, through a charge to earnings, to the extent the amortized cost exceeds the estimated fair value. However, the Company has not recorded other-than-temporary impairment losses on either of these types of intangible assets.

Income Taxes

Income Taxes

Amounts provided for income tax expense are based on income reported for financial statement purposes and do not necessarily represent amounts currently payable under tax laws. Deferred income taxes are provided for temporary differences between the financial reporting bases and income tax bases of the Company’s assets and liabilities, net operating losses, and tax credit carryforwards. Deferred tax assets and liabilities are measured using the enacted tax rates that are expected to apply to taxable income when such assets and liabilities are anticipated to be settled or realized. The effect on deferred tax assets and liabilities of a change in tax rates is recognized as tax expense or benefit in the period that includes the enactment date of the change. In determining the amount of deferred tax assets to recognize in the financial statements, the Company evaluates the likelihood of realizing such benefits in future periods. A valuation allowance is established if it is more likely than not that all or some portion of the deferred tax asset will not be realized. The Company recognizes interest and penalties related to income taxes within income tax expense in the consolidated statements of income.

The Company and its eligible subsidiaries file a consolidated federal income tax return. State and local income tax returns are filed on a combined, consolidated or separate return basis based upon each jurisdiction’s laws and regulations.

Derivatives

Derivatives

While the Company’s interest rate risk management policy permits the use of hedge accounting for derivatives, all of the derivatives held by the Company during the past several years have been accounted for as free-standing instruments. These instruments are carried at fair value, and changes in fair value are recognized in current earnings. They include interest rate swaps and caps, which are offered to customers to assist in managing their risks of adverse changes in interest rates. Each contract between the Company and a customer is offset by a contract between the Company and an institutional counterparty, thus minimizing the Company's exposure to rate changes. The Company also enters into certain contracts, known as credit risk participation agreements, to buy or sell credit protection on specific interest rate swaps. It also purchases and sells forward foreign exchange contracts, either in connection with customer transactions, or for its own trading purposes. In 2015, the Company began an origination and sales program of certain personal real estate mortgages. Derivative instruments under this program include mortgage loan commitments, forward loan sale contracts, and forward contracts to sell certain to-be-announced (TBA) securities.

The Company has master netting arrangements with various counterparties but does not offset derivative assets and liabilities under these arrangements in its consolidated balance sheets. However, interest rate swaps that are executed under central clearing requirements are presented on a net basis as mandated by the statutory terms of the Company's contract with its clearing counterparty.

Additional information about derivatives held by the Company and valuation methods employed is provided in Note 15, Fair Value Measurements and Note 17, Derivative Instruments.

Pension Plan

Pension Plan

The Company’s pension plan is described in Note 9, Employee Benefit Plans. The funded status of the plan is recognized as an asset or liability in the consolidated balance sheets, and changes in that funded status are recognized in the year in which the changes occur through other comprehensive income. Plan assets and benefit obligations are measured as of fiscal year end. The measurement of the projected benefit obligation and pension expense involve actuarial valuation methods and the use of various actuarial and economic assumptions. The Company monitors the assumptions and updates them periodically. Due to the long-term nature of the pension plan obligation, actual results may differ significantly from estimations. Such differences are adjusted over time as the assumptions are replaced by facts and values are recalculated.

Stock-Based Compensation

Stock-Based Compensation

The Company’s stock-based employee compensation plan is described in Note 10, Stock-Based Compensation and Directors Stock Purchase Plan. In accordance with the requirements of ASC 718-10-30-3 and 35-2, the Company measures the cost of stock-based compensation based on the grant-date fair value of the award, recognizing the cost over the requisite service period, which is generally the vesting period. The fair value of an option award is estimated using the Black-Scholes option-pricing model while the fair value of a nonvested stock award is the common stock (CBSH) market price. The expense recognized is reduced for estimated forfeitures over the vesting period and adjusted for actual forfeitures as they occurred, and was included in salaries and employee benefits in the accompanying consolidated statements of income. As further discussed in Note 10, effective January 1, 2017, the Company recognized forfeitures as a reduction to expense only when they have occurred, as allowed under the provisions of ASU 2016-09.

Comprehensive Income

Comprehensive Income

Comprehensive income includes all changes in stockholders’ equity during a period, except those resulting from transactions with stockholders. In addition to net income, other components of the Company’s comprehensive income include the after tax effect of changes in net unrealized gain / loss on securities available for sale and changes in net actuarial gain / loss on defined benefit post-retirement plans. Comprehensive income is reported in the accompanying consolidated statements of comprehensive income. See Note 11 for additional information on accumulated other comprehensive income (loss).

Treasury Stock

Treasury Stock

Purchases of the Company’s common stock are recorded at cost. Upon re-issuance for acquisitions, exercises of stock-based awards or other corporate purposes, treasury stock is reduced based upon the average cost basis of shares held.

Income Per Share

Income per Share

Basic income per share is computed using the weighted average number of common shares outstanding during each year. Diluted income per share includes the effect of all dilutive potential common shares (primarily stock options and stock appreciation rights) outstanding during each year. The Company applies the two-class method of computing income per share. The two-class method is an earnings allocation formula that determines income per share for common stock and for participating securities, according to dividends declared and participation rights in undistributed earnings. The Company’s nonvested stock awards are considered to be a class of participating security. All per share data has been restated to reflect the 5% stock dividend distributed in December 2017.

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Loans And Allowance For Loan Losses (Tables)

12 Months Ended

Dec. 31, 2017

Loans And Allowance For Loan Losses [Abstract]

Summary Classification Of Held To Maturity Loan Portfolio

Major classifications within the Company’s held for investment loan portfolio at December 31, 2017 and 2016 are as follows:

(In thousands)	2017		2016
Commercial:
Business	$	4,958,554	$	4,776,365
Real estate — construction and land	968,820		791,236
Real estate — business	2,697,452		2,643,374
Personal Banking:
Real estate — personal	2,062,787		2,010,397
Consumer	2,104,487		1,990,801
Revolving home equity	400,587		413,634
Consumer credit card	783,864		776,465
Overdrafts	7,123		10,464
Total loans	$	13,983,674	$	13,412,736

Loans To Directors And Executive Officers

Loans to directors and executive officers of the Parent and the Bank, and to their associates, are summarized as follows:

(In thousands)
Balance at January 1, 2017	$	62,991
Additions	655,544
Amounts collected	(639,920		)
Amounts written off	—
Balance, December 31, 2017	$	78,615

Summary Of Activity In The Allowance For Loan Losses

A summary of the activity in the allowance for losses during the previous three years follows:

(In thousands)	Commercial			Personal Banking		Total
Balance at December 31, 2014	$	89,622		$	66,910	$	156,532
Provision for loan losses	(9,319		)	38,046		28,727
Deductions:
Loans charged off	4,057			46,993		51,050
Less recoveries	5,840			11,483		17,323
Net loans charged off (recoveries)	(1,783		)	35,510		33,727
Balance at December 31, 2015	82,086			69,446		151,532
Provision for loan losses	4,898			31,420		36,318
Deductions:
Loans charged off	3,258			47,720		50,978
Less recoveries	7,635			11,425		19,060
Net loans charged off (recoveries)	(4,377		)	36,295		31,918
Balance at December 31, 2016	91,361			64,571		155,932
Provision for loan losses	2,327			42,917		45,244
Deductions:
Loans charged off	2,538			52,641		55,179
Less recoveries	2,554			10,981		13,535
Net loans charged off (recoveries)	(16		)	41,660		41,644
Balance at December 31, 2017	$	93,704		$	65,828	$	159,532

Allowance For Loan Losses And Related Loan Balance Disaggregated On The Basis Of Impairment Methodology

The following table shows the balance in the allowance for loan losses and the related loan balance at December 31, 2017 and 2016, disaggregated on the basis of impairment methodology. Impaired loans evaluated under ASC 310-10-35 include loans on non-accrual status which are individually evaluated for impairment and other impaired loans deemed to have similar risk characteristics, which are collectively evaluated. All other loans are collectively evaluated for impairment under ASC 450-20.

	Impaired Loans				All Other Loans
(In thousands)	Allowance for Loan Losses		Loans Outstanding		Allowance for Loan Losses		Loans Outstanding
December 31, 2017
Commercial	$	3,067	$	92,613	$	90,637	$	8,532,213
Personal Banking	1,176		22,182		64,652		5,336,666
Total	$	4,243	$	114,795	$	155,289	$	13,868,879
December 31, 2016
Commercial	$	1,817	$	44,795	$	89,544	$	8,166,180
Personal Banking	1,292		19,737		63,279		5,182,024
Total	$	3,109	$	64,532	$	152,823	$	13,348,204

Investment In Impaired Loans

(In thousands)	2017		2016
Non-accrual loans	$	11,983	$	14,283
Restructured loans (accruing)	102,812		50,249
Total impaired loans	$	114,795	$	64,532

Additional Information About Impaired Loans Held

The following table provides additional information about impaired loans held by the Company at December 31, 2017 and 2016, segregated between loans for which an allowance for credit losses has been provided and loans for which no allowance has been provided.

(In thousands)	Recorded Investment		Unpaid Principal Balance		Related Allowance
December 31, 2017
With no related allowance recorded:
Business	$	5,356	$	9,000	$	—
Real estate – business	1,299		1,303		—
Consumer	779		817		—
	$	7,434	$	11,120	$	—
With an allowance recorded:
Business	$	72,589	$	73,168	$	2,455
Real estate – construction and land	837		841		27
Real estate – business	12,532		13,071		585
Real estate – personal	9,126		11,914		532
Consumer	5,388		5,426		67
Revolving home equity	204		204		11
Consumer credit card	6,685		6,685		566
	$	107,361	$	111,309	$	4,243
Total	$	114,795	$	122,429	$	4,243
December 31, 2016
With no related allowance recorded:
Business	$	7,375	$	10,470	$	—
Real estate – construction and land	557		752		—
	$	7,932	$	11,222	$	—
With an allowance recorded:
Business	$	29,924	$	31,795	$	1,318
Real estate – construction and land	69		72		3
Real estate – business	6,870		8,072		496
Real estate – personal	6,394		9,199		642
Consumer	5,281		5,281		57
Revolving home equity	584		584		1
Consumer credit card	7,478		7,478		592
	$	56,600	$	62,481	$	3,109
Total	$	64,532	$	73,703	$	3,109

Interest Income Recognized On Impaired Loans

The table below shows interest income recognized during the years ended December 31, 2017, 2016 and 2015 for impaired loans held at the end of each respective period. This interest relates to accruing restructured loans, as discussed previously.

	Years Ended December 31
(In thousands)	2017		2016		2015
Interest income recognized on impaired loans:
Business	$	3,135	$	1,064	$	495
Real estate – construction and land	41		2		80
Real estate – business	514		171		122
Real estate – personal	402		152		187
Consumer	307		339		348
Revolving home equity	10		31		20
Consumer credit card	673		722		750
Total	$	5,082	$	2,481	$	2,002

Aging Information On Past Due And Nonaccrual Loans

The following table provides aging information on the Company’s past due and accruing loans, in addition to the balances of loans on non-accrual status, at December 31, 2017 and 2016.

(In thousands)	Current or Less Than 30 Days Past Due		30 – 89 Days Past Due		90 Days Past Due and Still Accruing		Non-accrual		Total
December 31, 2017
Commercial:
Business	$	4,949,148	$	3,085	$	374	$	5,947	$	4,958,554
Real estate – construction and land	967,321		1,473		21		5		968,820
Real estate – business	2,694,234		482		—		2,736		2,697,452
Personal Banking:
Real estate – personal	2,050,787		6,218		3,321		2,461		2,062,787
Consumer	2,067,025		32,674		3,954		834		2,104,487
Revolving home equity	397,349		1,962		1,276		—		400,587
Consumer credit card	764,568		10,115		9,181		—		783,864
Overdrafts	6,840		283		—		—		7,123
Total	$	13,897,272	$	56,292	$	18,127	$	11,983	$	13,983,674
December 31, 2016
Commercial:
Business	$	4,763,274	$	3,735	$	674	$	8,682	$	4,776,365
Real estate – construction and land	789,633		1,039		—		564		791,236
Real estate – business	2,639,586		2,154		—		1,634		2,643,374
Personal Banking:
Real estate – personal	1,995,724		9,162		2,108		3,403		2,010,397
Consumer	1,957,358		29,783		3,660		—		1,990,801
Revolving home equity	411,483		1,032		1,119		—		413,634
Consumer credit card	757,443		10,187		8,835		—		776,465
Overdrafts	10,014		450		—		—		10,464
Total	$	13,324,515	$	57,542	$	16,396	$	14,283	$	13,412,736

Total Average Impaired Loans

Total average impaired loans during 2017 and 2016 are shown in the table below.

	2017						2016
(In thousands)	Commercial		Personal Banking		Total		Commercial		Personal Banking		Total
Average impaired loans:
Non-accrual loans	$	9,658	$	3,989	$	13,647	$	17,294	$	4,135	$	21,429
Restructured loans (accruing)	49,070		17,539		66,609		32,295		17,058		49,353
Total	$	58,728	$	21,528	$	80,256	$	49,589	$	21,193	$	70,782

Credit Quality Of Commercial Loan Portfolio

The following table provides information about the credit quality of the Commercial loan portfolio, using the Company’s internal rating system as an indicator. The internal rating system is a series of grades reflecting management’s risk assessment, based on its analysis of the borrower’s financial condition. The “pass” category consists of a range of loan grades that reflect increasing, though still acceptable, risk. Movement of risk through the various grade levels in the “pass” category is monitored for early identification of credit deterioration. The “special mention” rating is attached to loans where the borrower exhibits material negative financial trends due to borrower specific or systemic conditions that, if left uncorrected, threaten its capacity to meet its debt obligations. The borrower is believed to have sufficient financial flexibility to react to and resolve its negative financial situation. It is a transitional grade that is closely monitored for improvement or deterioration. The “substandard” rating is applied to loans where the borrower exhibits well-defined weaknesses that jeopardize its continued performance and are of a severity that the distinct possibility of default exists. Loans are placed on “non-accrual” when management does not expect to collect payments consistent with acceptable and agreed upon terms of repayment, as discussed in Note 1.

	Commercial Loans
(In thousands)	Business		Real Estate -Construction		Real Estate - Business		Total
December 31, 2017
Pass	$	4,740,013	$	955,499	$	2,593,005	$	8,288,517
Special mention	59,177		10,614		50,577		120,368
Substandard	153,417		2,702		51,134		207,253
Non-accrual	5,947		5		2,736		8,688
Total	$	4,958,554	$	968,820	$	2,697,452	$	8,624,826
December 31, 2016
Pass	$	4,607,553	$	788,778	$	2,543,348	$	7,939,679
Special mention	116,642		722		45,479		162,843
Substandard	43,488		1,172		52,913		97,573
Non-accrual	8,682		564		1,634		10,880
Total	$	4,776,365	$	791,236	$	2,643,374	$	8,210,975

Summary Of Loans In The Personal Banking Portfolio Percentage Of Balances Outstanding

The credit quality of Personal Banking loans is monitored primarily on the basis of aging/delinquency, and this information is provided in the table in the above section on "Delinquent and non-accrual loans". In addition, FICO scores are obtained and updated on a quarterly basis for most of the loans in the Personal Banking portfolio. This is a published credit score designed to measure the risk of default by taking into account various factors from a person's financial history. The bank normally obtains a FICO score at the loan's origination and renewal dates, and updates are obtained on a quarterly basis. Excluded from the table below are certain personal real estate loans for which FICO scores are not obtained because the loans are related to commercial activity. These loans totaled $219.2 million at December 31, 2017 and $237.2 million at December 31, 2016. The table also excludes consumer loans related to the Company's patient healthcare loan program, which totaled $145.0 million at December 31, 2017 and $75.4 million at December 31, 2016. As the healthcare loans are guaranteed by the hospital, FICO scores are not considered relevant for this program. The personal real estate loans and consumer loans excluded below totaled less than 7% of the Personal Banking portfolio. For the remainder of loans in the Personal Banking portfolio, the table below shows the percentage of balances outstanding at December 31, 2017 and 2016 by FICO score.

	Personal Banking Loans
	% of Loan Category
	Real Estate - Personal		Consumer		Revolving Home Equity		Consumer Credit Card
December 31, 2017
FICO score:
Under 600	1.3	%	3.3	%	1.1	%	4.7	%
600 – 659	2.1		5.5		1.7		14.4
660 – 719	10.5		17.3		9.5		34.4
720 – 779	25.6		26.8		21.4		26.0
780 and over	60.5		47.1		66.3		20.5
Total	100.0	%	100.0	%	100.0	%	100.0	%
December 31, 2016
FICO score:
Under 600	1.3	%	3.4	%	1.0	%	4.9	%
600 – 659	2.6		6.4		1.8		15.5
660 – 719	10.4		19.7		9.7		34.9
720 – 779	25.4		26.3		21.1		25.1
780 and over	60.3		44.2		66.4		19.6
Total	100.0	%	100.0	%	100.0	%	100.0	%

Additional Information about Troubled Debt Restructurings [Table Text Block]

Troubled debt restructurings also include certain credit card loans under various debt management and assistance programs. Modifications to credit card loans generally involve removing the available line of credit, placing loans on amortizing status, and lowering the contractual interest rate. The Company also classified certain loans as troubled debt restructurings because they were not reaffirmed by the borrower in bankruptcy proceedings. These loans are comprised of personal real estate, revolving home equity and consumer loans. Interest on these loans is being recognized on an accrual basis, as the borrowers are continuing to make payments.

The table below summarizes the troubled debt restructurings outstanding by type of modification, as described above.

		December 31
(In thousands)		2017		2016
Accruing loans:
	Non-market interest rates	$	88,588	$	34,531
	Assistance programs	6,685		7,478
	Bankruptcy non-affirmation	7,283		7,937
	Other	256		303
Non-accrual loans		7,796		8,825
Total restructured loans		$	110,608	$	59,074

Outstanding Balance Of Loans Classified As Troubled Debt Restructurings

The table below shows the balance of troubled debt restructurings by loan classification at December 31, 2017, in addition to the period end balances of restructured loans which the Company considers to have been in default at any time during the past twelve months. For purposes of this disclosure, the Company considers "default" to mean 90 days or more past due as to interest or principal.

(In thousands)	December 31, 2017		Balance 90 days past due at any time during previous 12 months
Commercial:
Business	$	77,400	$	—
Real estate – construction and land	776		—
Real estate – business	12,394		—
Personal Banking:
Real estate – personal	7,760		278
Consumer	5,389		81
Revolving home equity	204		42
Consumer credit card	6,685		630
Total restructured loans	$	110,608	$	1,031

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Investment Securities (Tables)

12 Months Ended

Dec. 31, 2017

Investments, Debt and Equity Securities [Abstract]

Investment Securities, At Fair Value

Investment securities, at fair value, consisted of the following at December 31, 2017 and 2016.

(In thousands)	2017		2016
Available for sale:
U.S. government and federal agency obligations	$	917,147	$	920,904
Government-sponsored enterprise obligations	406,363		449,998
State and municipal obligations	1,611,366		1,778,214
Agency mortgage-backed securities	3,040,913		2,685,931
Non-agency mortgage-backed securities	905,793		1,055,639
Asset-backed securities	1,492,800		2,381,301
Other debt securities	351,060		325,953
Equity securities	48,838		51,263
Total available for sale	8,774,280		9,649,203
Trading	18,269		22,225
Non-marketable	100,758		99,558
Total investment securities	$	8,893,307	$	9,770,986

Summary Of Available For Sale Investment Securities By Maturity Groupings

(Dollars in thousands)	Amortized Cost		Fair Value		Weighted Average Yield
U.S. government and federal agency obligations:
Within 1 year	$	57,983	$	58,347	1.71
After 1 but within 5 years	641,114		639,192		1.45
After 5 but within 10 years	149,589		149,927		.43
After 10 years	68,808		69,681		.59
Total U.S. government and federal agency obligations	917,494		917,147		1.24
Government-sponsored enterprise obligations:
Within 1 year	215,763		215,434		1.35
After 1 but within 5 years	121,575		121,199		1.93
After 5 but within 10 years	34,983		34,870		2.71
After 10 years	35,945		34,860		3.00
Total government-sponsored enterprise obligations	408,266		406,363		1.79
State and municipal obligations:
Within 1 year	164,756		165,638		2.65
After 1 but within 5 years	665,351		670,953		2.21
After 5 but within 10 years	709,248		721,181		2.46
After 10 years	53,352		53,594		3.01
Total state and municipal obligations	1,592,707		1,611,366		2.39
Mortgage and asset-backed securities:
Agency mortgage-backed securities	3,046,701		3,040,913		2.62
Non-agency mortgage-backed securities	903,920		905,793		2.54
Asset-backed securities	1,495,380		1,492,800		2.03
Total mortgage and asset-backed securities	5,446,001		5,439,506		2.45
Other debt securities:
Within 1 year	10,390		10,389
After 1 but within 5 years	247,181		247,626
After 5 but within 10 years	93,417		93,045
Total other debt securities	350,988		351,060
Equity securities	4,411		48,838
Total available for sale investment securities	$	8,719,867	$	8,774,280

Available For Sale Securities Unrealized Gains And Losses By Security Type

For securities classified as available for sale, the following table shows the unrealized gains and losses (pre-tax) in accumulated other comprehensive income, by security type.

(In thousands)	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
December 31, 2017
U.S. government and federal agency obligations	$	917,494	$	4,096	$	(4,443	)	$	917,147
Government-sponsored enterprise obligations	408,266		26		(1,929		)	406,363
State and municipal obligations	1,592,707		21,413		(2,754		)	1,611,366
Mortgage and asset-backed securities:
Agency mortgage-backed securities	3,046,701		17,956		(23,744		)	3,040,913
Non-agency mortgage-backed securities	903,920		6,710		(4,837		)	905,793
Asset-backed securities	1,495,380		2,657		(5,237		)	1,492,800
Total mortgage and asset-backed securities	5,446,001		27,323		(33,818		)	5,439,506
Other debt securities	350,988		1,250		(1,178		)	351,060
Equity securities	4,411		44,427		—			48,838
Total	$	8,719,867	$	98,535	$	(44,122	)	$	8,774,280
December 31, 2016
U.S. government and federal agency obligations	$	919,904	$	7,312	$	(6,312	)	$	920,904
Government-sponsored enterprise obligations	450,448		1,126		(1,576		)	449,998
State and municipal obligations	1,778,684		12,223		(12,693		)	1,778,214
Mortgage and asset-backed securities:
Agency mortgage-backed securities	2,674,964		31,610		(20,643		)	2,685,931
Non-agency mortgage-backed securities	1,054,446		7,686		(6,493		)	1,055,639
Asset-backed securities	2,389,176		3,338		(11,213		)	2,381,301
Total mortgage and asset-backed securities	6,118,586		42,634		(38,349		)	6,122,871
Other debt securities	327,030		935		(2,012		)	325,953
Equity securities	5,678		45,585		—			51,263
Total	$	9,600,330	$	109,815	$	(60,942	)	$	9,649,203

Cash Flow Model Inputs Used To Calculate Credit Losses

The credit-related portion of the loss on these securities was based on the cash flows projected to be received over the estimated life of the securities, discounted to present value, and compared to the current amortized cost bases of the securities. Significant inputs to the cash flow models used to calculate the credit losses on these securities included the following:

Significant Inputs	Range
Prepayment CPR	0%	-	25%
Projected cumulative default	14%	-	50%
Credit support	0%	-	54%
Loss severity	15%	-	63%

Changes In Recorded Credit Losses

The following table presents a rollforward of the cumulative OTTI credit losses recognized in earnings on all available for sale debt securities.

(In thousands)	2017			2016			2015
Cumulative OTTI credit losses at January 1	$	14,080		$	14,129		$	13,734
Credit losses on debt securities for which impairment was not previously recognized	111			—			76
Credit losses on debt securities for which impairment was previously recognized	274			270			407
Increase in expected cash flows that are recognized over remaining life of security	(266		)	(319		)	(88		)
Cumulative OTTI credit losses at December 31	$	14,199		$	14,080		$	14,129

Securities With Unrealized Losses And Length Of Impairment Period

Securities with unrealized losses recorded in accumulated other comprehensive income are shown in the table below, along with the length of the impairment period.

	Less than 12 months				12 months or longer				Total
(In thousands)	Fair Value		Unrealized Losses		Fair Value		Unrealized Losses		Fair Value		Unrealized Losses
December 31, 2017
U.S. government and federal agency obligations	$	618,617	$	4,443	$	—	$	—	$	618,617	$	4,443
Government-sponsored enterprise obligations	286,393		1,712		49,766		217		336,159		1,929
State and municipal obligations	282,843		1,752		49,339		1,002		332,182		2,754
Mortgage and asset-backed securities:
Agency mortgage-backed securities	1,320,689		9,433		619,300		14,311		1,939,989		23,744
Non-agency mortgage-backed securities	577,017		2,966		153,813		1,871		730,830		4,837
Asset-backed securities	786,048		3,168		264,295		2,069		1,050,343		5,237
Total mortgage and asset-backed securities	2,683,754		15,567		1,037,408		18,251		3,721,162		33,818
Other debt securities	144,090		727		20,202		451		164,292		1,178
Total	$	4,015,697	$	24,201	$	1,156,715	$	19,921	$	5,172,412	$	44,122
December 31, 2016
U.S. government and federal agency obligations	$	349,538	$	2,823	$	32,208	$	3,489	$	381,746	$	6,312
Government-sponsored enterprise obligations	190,441		1,576		—		—		190,441		1,576
State and municipal obligations	700,779		12,164		15,195		529		715,974		12,693
Mortgage and asset-backed securities:
Agency mortgage-backed securities	1,147,416		20,638		2,150		5		1,149,566		20,643
Non-agency mortgage-backed securities	688,131		6,373		34,946		120		723,077		6,493
Asset-backed securities	780,209		5,277		358,778		5,936		1,138,987		11,213
Total mortgage and asset-backed securities	2,615,756		32,288		395,874		6,061		3,011,630		38,349
Other debt securities	179,639		1,986		975		26		180,614		2,012
Total	$	4,036,153	$	50,837	$	444,252	$	10,105	$	4,480,405	$	60,942

State And Municipal Obligations, By State And Economic Sector

The Company’s holdings of state and municipal obligations included gross unrealized losses of $2.8 million at December 31, 2017. The state and municipal portfolio totaled $1.6 billion at fair value, or 18.4% of total available for sale securities. The portfolio is diversified in order to reduce risk, and the Company has processes and procedures in place to monitor its state and municipal holdings, identify signs of financial distress and, if necessary, exit its positions in a timely manner.

Credit Ratings In State And Municipal Bond Portfolio

The credit ratings (Moody’s rating or equivalent) at December 31, 2017 in the state and municipal bond portfolio are shown in the following table. The average credit quality of the portfolio is Aa2 as rated by Moody’s.

	% of Portfolio
Aaa	6.0	%
Aa	76.9
A	16.4
Not rated	.7
	100.0	%

Proceeds From Sales Of Securities And Components Of Investment Securities Gains And Losses

The following table presents proceeds from sales of securities and the components of investment securities gains and losses which have been recognized in earnings.

(In thousands)	2017			2016			2015
Proceeds from sales of available for sale securities	$	790,152		$	2,049		$	675,870
Proceeds from sales of non-marketable securities	2,228			22,331			13,161
Total proceeds	$	792,380		$	24,380		$	689,031
Available for sale:
Gains realized on sales	$	10,656		$	109		$	2,925
Losses realized on sales	(10,297		)	—			—
Losses realized on called bonds	(254		)	—			—
Gain realized on donation	31,074			—			—
Other-than-temporary impairment recognized on debt securities	(385		)	(270		)	(483		)
Non-marketable:
Gains realized on sales	970			4,349			2,516
Losses realized on sales	(880		)	(502		)	(40		)
Fair value adjustments, net	(5,833		)	(3,739		)	1,402
Investment securities gains (losses), net	$	25,051		$	(53	)	$	6,320

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Land, Buildings And Equipment (Tables)

12 Months Ended

Dec. 31, 2017

Property, Plant and Equipment [Abstract]

Schedule Of Land, Buildings And Equipment

Land, buildings and equipment consist of the following at December 31, 2017 and 2016:

(In thousands)	2017		2016
Land	$	94,992	$	98,221
Buildings and improvements	540,204		530,489
Equipment	216,876		258,030
Total	852,072		886,740
Less accumulated depreciation	516,962		549,035
Net land, buildings and equipment	$	335,110	$	337,705

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Goodwill And Other Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2017

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule Of Intangible Assets With Estimable Useful Lives

The following table presents information about the Company's intangible assets which have estimable useful lives.

	December 31, 2017										December 31, 2016
(In thousands)	Gross Carrying Amount		Accumulated Amortization			Valuation Allowance			Net Amount		Gross Carrying Amount		Accumulated Amortization			Valuation Allowance			Net Amount
Amortizable intangible assets:
Core deposit premium	$	31,270	$	(28,305	)	$	—		$	2,965	$	31,270	$	(27,429	)	$	—		$	3,841
Mortgage servicing rights	7,906		(3,244		)	(9		)	4,653		5,672		(2,782		)	(22		)	2,868
Total	$	39,176	$	(31,549	)	$	(9	)	$	7,618	$	36,942	$	(30,211	)	$	(22	)	$	6,709

Schedule Of Goodwill Allocated By Operating Segments

The carrying amount of goodwill and its allocation among segments at December 31, 2017 and 2016 is shown in the table below. As a result of ongoing assessments, no impairment of goodwill was recorded in 2017, 2016 or 2015. Further, the annual assessment of qualitative factors on January 1, 2018 revealed no likelihood of impairment as of that date.

(In thousands)	December 31, 2017		December 31, 2016
Consumer segment	$	70,721	$	70,721
Commercial segment	67,454		67,454
Wealth segment	746		746
Total goodwill	$	138,921	$	138,921

Schedule Of Changes In Carrying Amount Of Goodwill And Net Other Intangible Assets

Changes in the net carrying amount of goodwill and other net intangible assets for the years ended December 31, 2017 and 2016 are shown in the following table.

(In thousands)	Goodwill		Core Deposit Premium			Mortgage Servicing Rights
Balance at December 31, 2015	$	138,921	$	5,031		$	1,638
Originations	—		—			1,539
Amortization	—		(1,190		)	(316		)
Impairment reversal	—		—			7
Balance at December 31, 2016	138,921		3,841			2,868
Originations	—		—			2,234
Amortization	—		(876		)	(462		)
Impairment reversal	—		—			13
Balance at December 31, 2017	$	138,921	$	2,965		$	4,653

Schedule of Estimated Annual Amortization Expense

The following table shows the estimated future amortization expense based on existing asset balances and the interest rate environment as of December 31, 2017. The Company’s actual amortization expense in any given period may be different from the estimated amounts depending upon the acquisition of intangible assets, changes in mortgage interest rates, prepayment rates and other market conditions.

(In thousands)
2018	$	1,213
2019	1,038
2020	878
2021	753
2022	653

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Deposits (Tables)

12 Months Ended

Dec. 31, 2017

Deposits [Abstract]

Scheduled Maturities Of Total Time Open And Certificates Of Deposit

At December 31, 2017, the scheduled maturities of total time open and certificates of deposit were as follows:

(In thousands)
Due in 2018	$	1,414,554
Due in 2019	217,562
Due in 2020	73,192
Due in 2021	41,313
Due in 2022	18,191
Thereafter	2,052
Total	$	1,766,864

Maturities Of Time Open And Certificates Of Deposit Detailed Breakdown By Size Category

The following table shows a detailed breakdown of the maturities of time open and certificates of deposit, by size category, at December 31, 2017.

(In thousands)	Certificates of Deposit under $100,000		Other Time Deposits under $100,000		Certificates of Deposit over $100,000		Other Time Deposits over $100,000		Total
Due in 3 months or less	$	115,126	$	24,019	$	484,168	$	3,744	$	627,057
Due in over 3 through 6 months	115,595		26,607		197,173		5,438		344,813
Due in over 6 through 12 months	180,447		36,573		216,459		9,205		442,684
Due in over 12 months	82,789		53,490		205,085		10,946		352,310
Total	$	493,957	$	140,689	$	1,102,885	$	29,333	$	1,766,864

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Borrowings (Tables)

12 Months Ended

Dec. 31, 2017

Debt Disclosure [Abstract]

Short-Term Borrowings

The following table sets forth selected information for short-term borrowings (borrowings with an original maturity of less than one year).

(Dollars in thousands)	Year End Weighted Rate		Average Weighted Rate		Average Balance Outstanding		Maximum Outstanding at any Month End		Balance at December 31
Federal funds purchased and repurchase agreements:
2017	.8	%	.7	%	$	1,462,387	$	1,984,071	$	1,507,138
2016	.4		.3		1,266,093		1,723,905		1,723,905
2015	.2		.1		1,654,860		2,193,197		1,963,552

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Income Taxes (Tables)

12 Months Ended

Dec. 31, 2017

Income Tax Disclosure [Abstract]

Schedule Of Components Of Income Tax Expense (Benefit)

The components of income tax expense from operations for the years ended December 31, 2017, 2016 and 2015 were as follows:

(In thousands)	Current		Deferred			Total
Year ended December 31, 2017:
U.S. federal	$	89,154	$	12,190		$	101,344
State and local	7,735		1,427			9,162
Total	$	96,889	$	13,617		$	110,506
Year ended December 31, 2016:
U.S. federal	$	116,753	$	(2,036	)	$	114,717
State and local	9,457		(23		)	9,434
Total	$	126,210	$	(2,059	)	$	124,151
Year ended December 31, 2015:
U.S. federal	$	102,607	$	7,084		$	109,691
State and local	6,551		348			6,899
Total	$	109,158	$	7,432		$	116,590

Schedule Of Income Tax Expense Recorded Directly To Stockholders Equity

The components of income tax (benefit) expense recorded directly to stockholders’ equity for the years ended December 31, 2017, 2016 and 2015 were as follows:

(In thousands)	2017			2016			2015
Unrealized gain (loss) on securities available for sale	$	2,104		$	(13,952	)	$	(19,634	)
Accumulated pension (benefit) loss	(184		)	778			1,478
Compensation expense for tax purposes in excess of amounts recognized for financial reporting purposes	—			(3,390		)	(2,132		)
Income tax (benefit) expense allocated to stockholders’ equity	$	1,920		$	(16,564	)	$	(20,288	)

Components Of Deferred Tax Assets And Liabilities

Significant components of the Company’s deferred tax assets and liabilities at December 31, 2017 and 2016 were as follows:

(In thousands)	2017			2016
Deferred tax assets:
Loans, principally due to allowance for loan losses	$	40,341		$	61,233
Equity-based compensation	8,201			12,633
Deferred compensation	5,647			7,998
Private equity investments	5,473			9,667
Accrued expenses	5,245			16,638
Unearned fee income	3,701			3,819
Other	4,430			6,071
Total deferred tax assets	73,038			118,059
Deferred tax liabilities:
Equipment lease financing	45,825			71,355
Unrealized gain on securities available for sale	13,603			18,572
Land, buildings and equipment	8,592			10,375
Undistributed earnings of subsidiaries	7,094			23
Intangibles	5,732			9,105
Other	6,569			8,765
Total deferred tax liabilities	87,415			118,195
Net deferred tax liabilities	$	(14,377	)	$	(136	)

Schedule Of Company's Actual Income Tax Expense

A reconciliation between the expected federal income tax expense using the federal statutory tax rate of 35% and the Company’s actual income tax expense for 2017, 2016 and 2015 is provided in the table below. The effective tax rate is calculated by dividing income taxes by income before income taxes less the non-controlling interest expense.

(In thousands)	2017			2016			2015
Computed “expected” tax expense	$	150,461		$	139,840		$	133,112
Increase (decrease) in income taxes resulting from:
Tax-exempt interest, net of cost to carry	(20,295		)	(20,033		)	(19,083		)
Contribution of appreciated securities	(10,864		)	—			—
Tax reform enactment	(6,753		)	—			—
Share-based award payments	(6,613		)	—			—
State and local income taxes, net of federal tax benefit	5,955			6,132			4,484
Tax deductible dividends on allocated shares held by the Company’s ESOP	(966		)	(1,044		)	(1,093		)
Other	(419		)	(744		)	(830		)
Total income tax expense	$	110,506		$	124,151		$	116,590

Schedule Of Accrued Liability For Unrecognized Tax Benefit

The activity in the accrued liability for unrecognized tax benefits for the years ended December 31, 2017 and 2016 was as follows:

(In thousands)	2017			2016
Unrecognized tax benefits at beginning of year	$	1,228		$	1,278
Gross increases – tax positions in prior period	5			—
Gross decreases – tax positions in prior period	—			(1		)
Gross increases – current-period tax positions	268			269
Lapse of statute of limitations	(293		)	(318		)
Unrecognized tax benefits at end of year	$	1,208		$	1,228

The Company and its subsidiaries are subject to income tax by federal, state and local government taxing authorities. Tax years 2014 through 2017 remain open to examination for U.S. federal income tax as well as income tax in major state taxing jurisdictions.

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Employee Benefit Plans (Tables)

12 Months Ended

Dec. 31, 2017

Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract]

Employee Benefits Charged To Operating Expenses

Employee benefits charged to operating expenses are summarized in the table below. Substantially all of the Company’s employees are covered by a defined contribution (401(k)) plan, under which the Company makes matching contributions.

(In thousands)	2017		2016		2015
Payroll taxes	$	24,402	$	23,210	$	22,235
Medical plans	25,143		25,497		20,659
401(k) plan	14,244		13,562		12,841
Pension plans	704		987		1,495
Other	2,883		3,214		2,950
Total employee benefits	$	67,376	$	66,470	$	60,180

Components Of The Net Pension Cost

The following items are components of the net pension cost for the years ended December 31, 2017, 2016 and 2015.

(In thousands)	2017			2016			2015
Service cost-benefits earned during the year	$	621		$	500		$	503
Interest cost on projected benefit obligation	3,826			3,944			4,762
Expected return on plan assets	(5,785		)	(5,751		)	(6,092		)
Amortization of prior service cost	(271		)	(271		)	(271		)
Amortization of unrecognized net loss	2,313			2,565			2,593
Net periodic pension cost	$	704		$	987		$	1,495

Summary Of Pension Plans Funded Status

The following table sets forth the pension plans’ funded status, using valuation dates of December 31, 2017 and 2016.

(In thousands)	2017			2016
Change in projected benefit obligation
Projected benefit obligation at prior valuation date	$	116,695		$	117,562
Service cost	621			500
Interest cost	3,826			3,944
Benefits paid	(6,780		)	(6,322		)
Actuarial (gain) loss	6,305			1,011
Projected benefit obligation at valuation date	120,667			116,695
Change in plan assets
Fair value of plan assets at prior valuation date	99,537			99,325
Actual return on plan assets	9,564			6,513
Employer contributions	5,939			21
Benefits paid	(6,780		)	(6,322		)
Fair value of plan assets at valuation date	108,260			99,537
Funded status and net amount recognized at valuation date	$	(12,407	)	$	(17,158	)

Schedule Of Amounts Not Yet Reflected In Net Periodic Benefit Cost And Included In Accumulated Other Comprehensive Income (Loss), Pre-Tax Basis

Amounts not yet reflected in net periodic benefit cost and included in accumulated other comprehensive income (loss) at December 31, 2017 and 2016 are shown below, including amounts recognized in other comprehensive income during the periods. All amounts are shown on a pre-tax basis.

(In thousands)	2017			2016
Prior service cost	$	1,806		$	2,077
Accumulated loss	(33,499		)	(33,285		)
Accumulated other comprehensive loss	(31,693		)	(31,208		)
Cumulative employer contributions in excess of net periodic benefit cost	19,286			14,050
Net amount recognized as an accrued benefit liability on the December 31 balance sheet	$	(12,407	)	$	(17,158	)
Net loss arising during period	(2,527		)	(248		)
Amortization of net loss	2,313			2,565
Amortization of prior service cost	(271		)	(271		)
Total recognized in other comprehensive income	$	(485	)	$	2,046
Total income (expense) recognized in net periodic pension cost and other comprehensive income	$	(1,189	)	$	1,059

Assumptions On A Weighted Average Basis, Used In Accounting For Plans

The following assumptions, on a weighted average basis, were used in accounting for the plans.

	2017		2016		2015
Determination of benefit obligation at year end:
Effective discount rate for benefit obligations	3.57	%	4.05	%	4.15	%
Assumed credit on cash balance accounts	5.00	%	5.00	%	5.00	%
Determination of net periodic benefit cost for year ended:
Effective discount rate for benefit obligations	3.95	%	4.16	%	3.95	%
Effective rate for interest on benefit obligations	3.28	%	3.38	%	NA
Long-term rate of return on assets	6.00	%	6.00	%	6.00	%
Assumed credit on cash balance accounts	5.00	%	5.00	%	5.00	%

Fair Value Of Pension Plan Asset Category

The following table shows the fair values of the Company’s pension plan assets by asset category at December 31, 2017 and 2016. Information about the valuation techniques and inputs used to measure fair value are provided in Note 15 on Fair Value Measurements.

			Fair Value Measurements
(In thousands)	Total Fair Value		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
December 31, 2017
Assets:
U.S. government obligations	$	3,719	$	3,719	$	—	$	—
Government-sponsored enterprise obligations (a)	1,282		—		1,282		—
State and municipal obligations	8,527		—		8,527		—
Agency mortgage-backed securities (b)	7,896		—		7,896		—
Non-agency mortgage-backed securities	4,891		—		4,891		—
Asset-backed securities	3,833		—		3,833		—
Corporate bonds (c)	37,457		—		37,457		—
Equity securities and mutual funds: (d)
Mutual funds	6,979		6,979		—		—
Common stocks	23,744		23,744		—		—
International developed markets funds	7,870		7,870		—		—
Emerging markets funds	2,062		2,062		—		—
Total	$	108,260	$	44,374	$	63,886	$	—
December 31, 2016
Assets:
U.S. government obligations	$	3,621	$	3,621	$	—	$	—
Government-sponsored enterprise obligations (a)	1,215		—		1,215		—
State and municipal obligations	9,148		—		9,148		—
Agency mortgage-backed securities (b)	4,073		—		4,073		—
Non-agency mortgage-backed securities	5,437		—		5,437		—
Asset-backed securities	5,275		—		5,275		—
Corporate bonds (c)	34,037		—		34,037		—
Equity securities and mutual funds: (d)
Mutual funds	10,393		10,393		—		—
Common stocks	20,141		20,141		—		—
International developed markets funds	5,100		5,100		—		—
Emerging markets funds	1,097		1,097		—		—
Total	$	99,537	$	40,352	$	59,185	$	—

(a) This category represents bonds (excluding mortgage-backed securities) issued by agencies such as the Federal Home Loan Bank, the Federal Home Loan Mortgage Corp and the Federal National Mortgage Association.

(b) This category represents mortgage-backed securities issued by the agencies mentioned in (a).

(c) This category represents investment grade bonds issued in the U.S., primarily by domestic issuers, representing diverse industries.

(d) This category represents investments in individual common stocks and equity funds. These holdings are diversified, largely across the financial services, consumer goods, healthcare, electronic technology and technology servic

Future Benefit Payments

The following future benefit payments are expected to be paid:

(In thousands)
2018	$	7,133
2019	7,231
2020	7,413
2021	7,534
2022	7,473
2023 - 2027	37,421

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Stock-Based Compensation and Directors Stock Purchase Plan (Tables)

12 Months Ended

Dec. 31, 2017

Share-based Compensation [Abstract]

Summary Of The Status Of Nonvested Share Awards

A summary of the status of the Company’s nonvested share awards as of December 31, 2017 and changes during the year then ended is presented below.

	Shares		Weighted Average Grant Date Fair Value
Nonvested at January 1, 2017	1,461,713		$	33.02
Granted	263,123		54.56
Vested	(442,435	)	29.41
Forfeited	(27,883	)	39.12
Canceled	—		—
Nonvested at December 31, 2017	1,254,518		$	38.67

Schedule Of Share Based Payment Award Stock Options Valuation Assumptions [Table Text Block]

	2017			2016			2015
Weighted per share average fair value at grant date		$11.94			$6.79			$6.55
Assumptions:
Dividend yield	1.6		%	2.2		%	2.2		%
Volatility	21.1		%	21.2		%	21.3		%
Risk-free interest rate	2.4		%	1.8		%	1.8		%
Expected term	7.0 years			7.2 years			7.2 years

Summary Of SAR Activity

(Dollars in thousands, except per share data)	Shares		Weighted Average Exercise Price		Weighted Average Remaining Contractual Term		Aggregate Intrinsic Value
Outstanding at January 1, 2017	1,390,782		$	32.89
Granted	173,740		54.79
Forfeited	(13,325	)	42.19
Expired	(878	)	34.75
Exercised	(371,033	)	29.30
Outstanding at December 31, 2017	1,179,286		$	37.13	6.2	years	$	22,073
Exercisable at December 31, 2017	630,135		$	32.60	4.6	years	$	14,645

Schedule Of Additional Information About Stock Options and SARs Exercises

Additional information about stock options and SARs exercised is presented below.

(In thousands)	2017		2016		2015
Intrinsic value of options and SARs exercised	$	9,310	$	8,854	$	7,541
Cash received from options and SARs exercised	$	—	$	—	$	1,914
Tax benefit realized from options and SARs exercised	$	2,698	$	1,781	$	1,041

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Accumulated Other Comprehensive Income (Tables)

12 Months Ended

Dec. 31, 2017

Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]

Components Of Accumulated Other Comprehensive Income (Loss)

	Unrealized Gains (Losses) on Securities (1)						Pension Loss (2)			Total Accumulated Other Comprehensive Income
(In thousands)	OTTI			Other
Balance January 1, 2017	$	2,975		$	27,328		$	(19,328	)		$	10,975
Other comprehensive income (loss) before reclassifications	279			36,307			(2,527		)		34,059
Amounts reclassified from accumulated other comprehensive income	385			(31,433		)	2,042				(29,006		)
Current period other comprehensive income (loss), before tax	664			4,874			(485		)		5,053
Income tax (expense) benefit	(252		)	(1,852		)	184				(1,920		)
Current period other comprehensive income (loss), net of tax	412			3,022			(301		)		3,133
Transfer of unrealized gain on securities for which impairment was not previously recognized	24			(24		)	—				—
Balance December 31, 2017	$	3,411		$	30,326		$	(19,629	)		$	14,108
Balance January 1, 2016	$	3,316		$	49,750		$	(20,596	)		$	32,470
Other comprehensive loss before reclassifications	(820		)	(36,057		)	(248		)		(37,125		)
Amounts reclassified from accumulated other comprehensive income	270			(108		)	2,294				2,456
Current period other comprehensive income (loss), before tax	(550		)	(36,165		)	2,046				(34,669		)
Income tax (expense) benefit	209			13,743			(778		)		13,174
Current period other comprehensive income (loss), net of tax	(341		)	(22,422		)	1,268				(21,495		)
Balance December 31, 2016	$	2,975		$	27,328		$	(19,328	)		$	10,975

(1) The pre-tax amounts reclassified from accumulated other comprehensive income are included in "investment securities gains (losses), net" in the consolidated statements of income.

(2) The pre-tax amounts reclassified from accumulated other comprehensive income are included in the computation of net periodic pension cost as "amortization of prior service cost" and "amortization of unrecognized net loss" (see Note 9), for inclusion in the consolidated statements of income.

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Segments (Tables)

12 Months Ended

Dec. 31, 2017

Segment Reporting [Abstract]

Schedule Of Financial Information By Segment

Segment Income Statement Data

(In thousands)	Consumer			Commercial			Wealth			Segment Totals			Other/Elimination			Consolidated Totals
Year ended December 31, 2017:
Net interest income	$	279,031		$	328,345		$	47,264		$	654,640		$	79,039		$	733,679
Provision for loan losses	(41,829		)	205			(41		)	(41,665		)	(3,579		)	(45,244		)
Non-interest income	136,554			194,581			158,175			489,310			(2,706		)	486,604
Investment securities gains, net	—			—			—			—			25,051			25,051
Non-interest expense	(290,905		)	(290,874		)	(120,458		)	(702,237		)	(67,447		)	(769,684		)
Income before income taxes	$	82,851		$	232,257		$	84,940		$	400,048		$	30,358		$	430,406
Year ended December 31, 2016:
Net interest income	$	268,654		$	311,704		$	44,113		$	624,471		$	55,578		$	680,049
Provision for loan losses	(36,042		)	4,378			(122		)	(31,786		)	(4,532		)	(36,318		)
Non-interest income	131,988			199,384			144,661			476,033			(1,641		)	474,392
Investment securities losses, net	—			—			—			—			(53		)	(53		)
Non-interest expense	(282,061		)	(284,432		)	(113,888		)	(680,381		)	(36,684		)	(717,065		)
Income before income taxes	$	82,539		$	231,034		$	74,764		$	388,337		$	12,668		$	401,005
Year ended December 31, 2015:
Net interest income	$	266,328		$	296,510		$	42,653		$	605,491		$	28,829		$	634,320
Provision for loan losses	(34,864		)	1,032			75			(33,757		)	5,030			(28,727		)
Non-interest income	119,561			194,133			136,374			450,068			(1,929		)	448,139
Investment securities gains, net	—			—			—			—			6,320			6,320
Non-interest expense	(273,378		)	(267,343		)	(108,755		)	(649,476		)	(27,011		)	(676,487		)
Income before income taxes	$	77,647		$	224,332		$	70,347		$	372,326		$	11,239		$	383,565

Segment Balance Sheet Data

Segment Balance Sheet Data

(In thousands)	Consumer		Commercial		Wealth		Segment Totals		Other/Elimination		Consolidated Totals
Average balances for 2017:
Assets	$	2,610,045	$	8,830,584	$	1,218,598	$	12,659,227	$	12,372,381	$	25,031,608
Loans, including held for sale	2,471,578		8,635,035		1,209,792		12,316,405		1,312,746		13,629,151
Goodwill and other intangible assets	76,734		68,538		746		146,018		—		146,018
Deposits	10,190,613		8,301,004		2,090,582		20,582,199		12,587		20,594,786
Average balances for 2016:
Assets	$	2,673,915	$	8,267,963	$	1,116,969	$	12,058,847	$	12,497,624	$	24,556,471
Loans, including held for sale	2,533,528		8,072,528		1,108,211		11,714,267		1,239,221		12,953,488
Goodwill and other intangible assets	75,971		68,848		746		145,565		—		145,565
Deposits	9,956,327		8,243,394		2,084,940		20,284,661		46,252		20,330,913

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Common and Preferred Stock (Tables)

12 Months Ended

Dec. 31, 2017

Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract]

Summary Of Components Used To Calculate Basic And Diluted Income Per Share

(In thousands, except per share data)	2017		2016		2015
Basic income per common share:
Net income attributable to Commerce Bancshares, Inc.	$	319,383	$	275,391	$	263,730
Less preferred stock dividends	9,000		9,000		9,000
Net income available to common shareholders	310,383		266,391		254,730
Less income allocated to nonvested restricted stock	3,848		3,698		3,548
Net income allocated to common stock	$	306,535	$	262,693	$	251,182
Weighted average common shares outstanding	105,555		105,243		108,016
Basic income per common share	$	2.90	$	2.50	$	2.33
Diluted income per common share:
Net income available to common shareholders	$	310,383	$	266,391	$	254,730
Less income allocated to nonvested restricted stock	3,838		3,692		3,541
Net income allocated to common stock	$	306,545	$	262,699	$	251,189
Weighted average common shares outstanding	105,555		105,243		108,016
Net effect of the assumed exercise of stock-based awards -- based on the treasury stock method using the average market price for the respective periods	372		281		336
Weighted average diluted common shares outstanding	105,927		105,524		108,352
Diluted income per common share	$	2.89	$	2.49	$	2.32

Schedule Of Activity In The Outstanding Shares Of The Company's Common Stock

The table below shows activity in the outstanding shares of the Company’s common stock during the past three years. Shares in the table below are presented on an historical basis and have not been restated for the annual 5% stock dividends.

	Years Ended December 31
(In thousands)	2017		2016		2015
Shares outstanding at January 1	101,461		97,226		96,327
Issuance of stock:
Awards and sales under employee and director plans	403		397		435
5% stock dividend	5,078		4,831		4,641
Purchases of treasury stock under accelerated share repurchase programs	—		—		(3,635	)
Other purchases of treasury stock	(315	)	(959	)	(535	)
Other	(12	)	(34	)	(7	)
Shares outstanding at December 31	106,615		101,461		97,226

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Regulatory Capital Requirements (Tables)

12 Months Ended

Dec. 31, 2017

Regulatory Capital Requirements [Abstract]

Schedule Of Capital Amounts And Ratios On Consolidated Basis

The following tables show the capital amounts and ratios for the Company (on a consolidated basis) and the Bank, together with the minimum capital adequacy and well-capitalized capital requirements, at the last two year ends.

	Actual				Minimum Capital Adequacy Requirement				Well-Capitalized Capital Requirement
(Dollars in thousands)	Amount		Ratio		Amount		Ratio		Amount		Ratio
December 31, 2017
Total Capital (to risk-weightedassets):
Commerce Bancshares, Inc. (consolidated)	$	2,747,863	14.35	%	$	1,531,996	8.00	%	N.A.		N.A.
Commerce Bank	2,428,789		12.76		1,522,361		8.00		$	1,902,951	10.00	%
Tier I Capital (to risk-weightedassets):
Commerce Bancshares, Inc. (consolidated)	$	2,567,264	13.41	%	$	1,148,997	6.00	%	N.A.		N.A.
Commerce Bank	2,268,131		11.92		1,141,771		6.00		$	1,522,361	8.00	%
Tier I Common Capital (to risk-weightedassets):
Commerce Bancshares, Inc. (consolidated)	$	2,422,480	12.65	%	$	861,748	4.50	%	N.A.		N.A.
Commerce Bank	2,268,131		11.92		856,328		4.50		$	1,236,918	6.50	%
Tier I Capital (to adjusted quarterly average assets):
(Leverage Ratio)
Commerce Bancshares, Inc. (consolidated)	$	2,567,264	10.39	%	$	988,653	4.00	%	N.A.		N.A.
Commerce Bank	2,268,131		9.20		986,240		4.00		$	1,232,800	5.00	%
December 31, 2016
Total Capital (to risk-weightedassets):
Commerce Bancshares, Inc. (consolidated)	$	2,529,675	13.32	%	$	1,519,578	8.00	%	N.A.		N.A.
Commerce Bank	2,268,845		12.00		1,512,471		8.00		$	1,890,589	10.00	%
Tier I Capital (to risk-weightedassets):
Commerce Bancshares, Inc. (consolidated)	$	2,352,154	12.38	%	$	1,139,684	6.00	%	N.A.		N.A.
Commerce Bank	2,111,797		11.17		1,134,353		6.00		$	1,512,471	8.00	%
Tier I Common Capital (to risk-weightedassets):
Commerce Bancshares, Inc. (consolidated)	$	2,207,370	11.62	%	$	854,763	4.50	%	N.A.		N.A.
Commerce Bank	2,111,797		11.17		850,765		4.50		$	1,228,883	6.50	%
Tier I Capital (to adjusted quarterly average assets):
(Leverage Ratio)
Commerce Bancshares, Inc. (consolidated)	$	2,352,154	9.55	%	$	985,698	4.00	%	N.A.		N.A.
Commerce Bank	2,111,797		8.59		983,081		4.00		$	1,228,851	5.00	%

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Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2017

Fair Value Disclosures [Abstract]

Summary Of Assets And Liabilities Measured At Fair Value On A Recurring Basis

The table below presents the carrying values of assets and liabilities measured at fair value on a recurring basis at December 31, 2017 and 2016. There were no transfers among levels during these years.

			Fair Value Measurements Using
(In thousands)	Total Fair Value		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs  (Level 3)
December 31, 2017
Assets:
Residential mortgage loans held for sale	$	15,327	$	—	$	15,327	$	—
Available for sale securities:
U.S. government and federal agency obligations	917,147		917,147		—		—
Government-sponsored enterprise obligations	406,363		—		406,363		—
State and municipal obligations	1,611,366		—		1,594,350		17,016
Agency mortgage-backed securities	3,040,913		—		3,040,913		—
Non-agency mortgage-backed securities	905,793		—		905,793		—
Asset-backed securities	1,492,800		—		1,492,800		—
Other debt securities	351,060		—		351,060		—
Equity securities	48,838		19,864		28,974		—
Trading securities	18,269		—		18,269		—
Private equity investments	55,752		—		—		55,752
Derivatives *	8,349		—		7,723		626
Assets held in trust for deferred compensation plan	12,843		12,843		—		—
Total assets	8,884,820		949,854		7,861,572		73,394
Liabilities:
Derivatives *	8,074		—		7,951		123
Liabilities held in trust for deferred compensation plan	12,843		12,843		—		—
Total liabilities	$	20,917	$	12,843	$	7,951	$	123
December 31, 2016
Assets:
Residential mortgage loans held for sale	$	9,263	$	—	$	9,263	$	—
Available for sale securities:
U.S. government and federal agency obligations	920,904		920,904		—		—
Government-sponsored enterprise obligations	449,998		—		449,998		—
State and municipal obligations	1,778,214		—		1,761,532		16,682
Agency mortgage-backed securities	2,685,931		—		2,685,931		—
Non-agency mortgage-backed securities	1,055,639		—		1,055,639		—
Asset-backed securities	2,381,301		—		2,381,301		—
Other debt securities	325,953		—		325,953		—
Equity securities	51,263		24,967		26,296		—
Trading securities	22,225		—		22,225		—
Private equity investments	50,820		—		—		50,820
Derivatives *	13,566		—		13,146		420
Assets held in trust for deferred compensation plan	10,261		10,261		—		—
Total assets	9,755,338		956,132		8,731,284		67,922
Liabilities:
Derivatives *	13,339		—		13,177		162
Liabilities held in trust for deferred compensation plan	10,261		10,261		—		—
Total liabilities	$	23,600	$	10,261	$	13,177	$	162

* The fair value of each class of derivative is shown in Note 17.

.

Summary Of Changes In Level 3 Assets And Liabilities Measured At Fair Value On A Recurring Basis

The changes in Level 3 assets and liabilities measured at fair value on a recurring basis are summarized as follows:

	Fair Value Measurements Using Significant Unobservable Inputs (Level 3)
(In thousands)	State and Municipal Obligations			Private Equity Investments			Derivatives			Total
Year ended December 31, 2017:
Balance at January 1, 2017	$	16,682		$	50,820		$	258		$	67,760
Total gains or losses (realized/unrealized):
Included in earnings	—			(5,833		)	266			(5,567		)
Included in other comprehensive income	882			—			—			882
Investment securities called	(600		)	—			—			(600		)
Discount accretion	52			—			—			52
Purchases of private equity securities	—			13,352			—			13,352
Sale / pay down of private equity securities	—			(2,621		)	—			(2,621		)
Capitalized interest/dividends	—			34			—			34
Purchase of risk participation agreement	—			—			70			70
Sale of risk participation agreement	—			—			(91		)	(91		)
Balance at December 31, 2017	$	17,016		$	55,752		$	503		$	73,271
Total gains or losses for the year included in earnings attributable to the change in unrealized gains or losses relating to assets still held at December 31, 2017	$	—		$	(5,658	)	$	615		$	(5,043	)
Year ended December 31, 2016:
Balance at January 1, 2016	$	17,195		$	63,032		$	69		$	80,296
Total gains or losses (realized/unrealized):
Included in earnings	—			(3,739		)	43			(3,696		)
Included in other comprehensive income	583			—			—			583
Investment securities called	(1,200		)	—			—			(1,200		)
Discount accretion	104			—			—			104
Purchases of private equity securities	—			9,906			—			9,906
Sale / pay down of private equity securities	—			(18,471		)	—			(18,471		)
Capitalized interest/dividends	—			92			—			92
Purchase of risk participation agreement	—			—			404			404
Sale of risk participation agreement	—			—			(258		)	(258		)
Balance at December 31, 2016	$	16,682		$	50,820		$	258		$	67,760
Total gains or losses for the year included in earnings attributable to the change in unrealized gains or losses relating to assets still held at December 31, 2016	$	—		$	(5,914	)	$	306		$	(5,608	)

Summary Of Gains And Losses On Level 3 Assets And Liabilities

Gains and losses on the Level 3 assets and liabilities in the table above are reported in the following income categories:

(In thousands)	Loan Fees and Sales		Other Non-Interest Income			Investment Securities Gains (Losses), Net			Total
Year ended December 31, 2017:
Total gains or losses included in earnings	$	231	$	35		$	(5,833	)	$	(5,567	)
Change in unrealized gains or losses relating to assets still held at December 31, 2017	$	580	$	35		$	(5,658	)	$	(5,043	)
Year ended December 31, 2016:
Total gains or losses included in earnings	$	87	$	(44	)	$	(3,739	)	$	(3,696	)
Change in unrealized gains or losses relating to assets still held at December 31, 2016	$	350	$	(44	)	$	(5,914	)	$	(5,608	)

Summary Of Quantitative Information About Level 3 Fair Value Measurements

Level 3 Inputs

As shown above, the Company's significant Level 3 measurements which employ unobservable inputs that are readily quantifiable pertain to auction rate securities (ARS) held by the Bank, investments in portfolio concerns held by the Company's private equity subsidiaries, and held for sale residential mortgage loan commitments. ARS are included in state and municipal securities and totaled $17.0 million at December 31, 2017, while private equity investments, included in non-marketable securities, totaled $55.8 million.

Information about these inputs is presented in the table and discussions below.

Quantitative Information about Level 3 Fair Value Measurements						Weighted
	Valuation Technique	Unobservable Input	Range			Average
Auction rate securities	Discounted cash flow	Estimated market recovery period			5 years
		Estimated market rate	3.1%	-	4.5%
Private equity investments	Market comparable companies	EBITDA multiple	4.0	-	6.0
Mortgage loan commitments	Discounted cash flow	Probability of funding	50.4%	-	100.0%	76.0%
		Embedded servicing value	(.3)%	-	2.0%	1.1%

Schedule Of Fair Value Disclosures Measured On Nonrecurring Basis [Table Text Block]

Instruments Measured at Fair Value on a Nonrecurring Basis

For assets measured at fair value on a nonrecurring basis during 2017 and 2016, and still held as of December 31, 2017 and 2016, the following table provides the adjustments to fair value recognized during the respective periods, the level of valuation assumptions used to determine each adjustment, and the carrying value of the related individual assets or portfolios at December 31, 2017 and 2016.

			Fair Value Measurements Using
(In thousands)	Fair Value		Quoted Prices in Active Markets for Identical Assets  (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs  (Level 3)		Total Gains (Losses)
Balance at December 31, 2017
Collateral dependent impaired loans	$	1,236	$	—	$	—	$	1,236	$	(617	)
Mortgage servicing rights	4,653		—		—		4,653		13
Foreclosed assets	—		—		—		—		(9		)
Long-lived assets	3,378		—		—		3,378		(724		)
Balance at December 31, 2016
Collateral dependent impaired loans	$	1,331	$	—	$	—	$	1,331	$	(1,700	)
Mortgage servicing rights	2,868		—		—		2,868		7
Foreclosed assets	18		—		—		18		(20		)
Long-lived assets	2,408		—		—		2,408		(1,054		)

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Fair Value Of Financial Instruments (Tables)

12 Months Ended

Dec. 31, 2017

Fair Value Disclosures [Abstract]

Schedule Of Estimated Fair Value Of Financial Instruments

The estimated fair values of the Company’s financial instruments are as follows:

	Fair Value Hierarchy Level	2017				2016
(In thousands)		Carrying Amount		Estimated Fair Value		Carrying Amount		Estimated Fair Value
Financial Assets
Loans:
Business	Level 3	$	4,958,554	$	4,971,401	$	4,776,365	$	4,787,469
Real estate - construction and land	Level 3	968,820		979,389		791,236		800,426
Real estate - business	Level 3	2,697,452		2,702,598		2,643,374		2,658,093
Real estate - personal	Level 3	2,062,787		2,060,443		2,010,397		2,005,227
Consumer	Level 3	2,104,487		2,074,129		1,990,801		1,974,784
Revolving home equity	Level 3	400,587		400,333		413,634		414,499
Consumer credit card	Level 3	783,864		798,093		776,465		794,856
Overdrafts	Level 3	7,123		7,123		10,464		10,464
Loans held for sale	Level 2	21,398		21,398		14,456		14,456
Investment securities:
Available for sale	Level 1	937,011		937,011		945,871		945,871
Available for sale	Level 2	7,820,253		7,820,253		8,686,650		8,686,650
Available for sale	Level 3	17,016		17,016		16,682		16,682
Trading	Level 2	18,269		18,269		22,225		22,225
Non-marketable	Level 3	100,758		100,758		99,558		99,558
Federal funds sold	Level 1	42,775		42,775		15,470		15,470
Securities purchased under agreements to resell	Level 3	700,000		695,194		725,000		728,179
Interest earning deposits with banks	Level 1	30,631		30,631		272,275		272,275
Cash and due from banks	Level 1	438,439		438,439		494,690		494,690
Derivative instruments	Level 2	7,723		7,723		13,146		13,146
Derivative instruments	Level 3	626		626		420		420
Assets held in trust for deferred compensation plan	Level 1	12,843		12,843		10,261		10,261
Financial Liabilities
Non-interest bearing deposits	Level 1	$	7,158,962	$	7,158,962	$	7,429,398	$	7,429,398
Savings, interest checking and money market deposits	Level 1	11,499,620		11,499,620		11,430,789		11,430,789
Time open and certificates of deposit	Level 3	1,766,864		1,768,780		2,240,908		2,235,218
Federal funds purchased	Level 1	202,370		202,370		52,840		52,840
Securities sold under agreements to repurchase	Level 3	1,304,768		1,305,375		1,671,065		1,671,227
Other borrowings	Level 3	1,758		1,758		102,049		104,298
Derivative instruments	Level 2	7,951		7,951		13,177		13,177
Derivative instruments	Level 3	123		123		162		162
Liabilities held in trust for deferred compensation plan	Level 1	12,843		12,843		10,261		10,261

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Derivative Instruments (Tables)

12 Months Ended

Dec. 31, 2017

Derivative Instrument Detail [Abstract]

Schedule Of Notional Amounts Of Derivative Instruments

The notional amounts of the Company’s derivative instruments are shown in the table below. These contractual amounts, along with other terms of the derivative, are used to determine amounts to be exchanged between counterparties and are not a measure of loss exposure. The Company's derivative instruments are accounted for as free-standing derivatives, and changes in their fair value are recorded in current earnings.

	December 31
(In thousands)	2017		2016
Interest rate swaps	$	1,741,412	$	1,685,099
Interest rate caps	31,776		59,379
Credit risk participation agreements	133,488		121,514
Foreign exchange contracts	11,826		4,046
Mortgage loan commitments	17,110		12,429
Mortgage loan forward sale contracts	2,566		6,626
Forward TBA contracts	25,000		15,000
Total notional amount	$	1,963,178	$	1,904,093

Schedule Of Fair Values Of Derivative Instruments

The fair values of the Company’s derivative instruments are shown in the table below. Information about the valuation methods used to measure fair value is provided in Note 15 on Fair Value Measurements. Derivative instruments with a positive fair value (asset derivatives) are reported in other assets in the consolidated balance sheets while derivative instruments with a negative fair value (liability derivatives) are reported in other liabilities in the consolidated balance sheets. As mentioned in Note 15, effective January 2017, certain collateral posted to and from the Company's clearing counterparty has been offset against the fair values of cleared swaps, such that at December 31, 2017, the positive fair values of cleared swaps were reduced by $4.5 million and the negative fair values of cleared swaps were reduced by $4.3 million, as reflected in the table below.        

	Asset Derivatives				Liability Derivatives
	December 31				December 31
	2017		2016		2017			2016
(In thousands)	Fair Value				Fair Value
Derivative instruments:
Interest rate swaps	$	7,674	$	12,987	$	(7,857	)	$	(12,987	)
Interest rate caps	16		78		(16		)	(78		)
Credit risk participation agreements	46		65		(123		)	(156		)
Foreign exchange contracts	21		66		(40		)	(4		)
Mortgage loan commitments	580		355		—			(6		)
Mortgage loan forward sale contracts	8		—		(7		)	(63		)
Forward TBA contracts	4		15		(31		)	(45		)
Total	$	8,349	$	13,566	$	(8,074	)	$	(13,339	)

Summary Of The Effects Of Derivative Instruments On Consolidated Statements Of Income

The effects of derivative instruments on the consolidated statements of income are shown in the table below.

	Location of Gain or (Loss) Recognized in Income on Derivative	Amount of Gain or (Loss) Recognized in Income on Derivative
		For the Years Ended December 31
(In thousands)		2017			2016			2015
Derivative instruments:
Interest rate swaps	Other non-interest income	$	1,978		$	5,927		$	4,309
Interest rate caps	Other non-interest income	—			—			32
Credit risk participation agreements	Other non-interest income	35			(44		)	57
Foreign exchange contracts:	Other non-interest income	(80		)	55			253
Mortgage loan commitments	Loan fees and sales	231			87			263
Mortgage loan forward sale contracts	Loan fees and sales	64			(63		)	—
Forward TBA contracts	Loan fees and sales	(648		)	79			82
Total		$	1,580		$	6,041		$	4,996

The following table shows the extent to which assets and liabilities relating to derivative instruments have been offset in the consolidated balance sheets. It also provides information about these instruments which are subject to an enforceable master netting arrangement, irrespective of whether they are offset, and the extent to which the instruments could potentially be offset. Also shown is collateral received or pledged in the form of other financial instruments, which is generally cash or marketable securities. The collateral amounts in this table are limited to the outstanding balance of the related asset or liability (after netting is applied); thus amounts of excess collateral are not shown. Most of the derivatives in the following table were transacted under master netting arrangements that contain a conditional right of offset, such as close-out netting, upon default.

The Company is party to master netting arrangements with most of its swap derivative counterparties; however, the Company does not offset derivative assets and liabilities under these arrangements on its consolidated balance sheet. Collateral, usually in the form of marketable securities, is exchanged between the Company and dealer bank counterparties and is generally subject to thresholds and transfer minimums. By contract, it may be sold or re-pledged by the secured party until recalled at a subsequent valuation date by the pledging party. For those swap transactions requiring central clearing, the Company posts cash and securities to its clearing agency. Collateral positions are valued daily, and adjustments to amounts received and pledged by the Company are made as appropriate to maintain proper collateralization for these transactions. Swap derivative transactions with customers are generally secured by rights to non-financial collateral, such as real and personal property, which is not shown in the table below.

Balance Sheet Offsetting, Derivatives [Table Text Block]

							Gross Amounts Not Offset in the Balance Sheet
(In thousands)	Gross Amount Recognized		Gross Amounts Offset in the Balance Sheet		Net Amounts Presented in the Balance Sheet		Financial Instruments Available for Offset			Collateral Received/Pledged			Net Amount
December 31, 2017
Assets:
Derivatives subject to master netting agreements	$	7,726	$	—	$	7,726	$	(233	)	$	(824	)	$	6,669
Derivatives not subject to master netting agreements	623		—		623
Total derivatives	8,349		—		8,349
Liabilities:
Derivatives subject to master netting agreements	7,935		—		7,935		(233		)	(1,570		)	6,132
Derivatives not subject to master netting agreements	139		—		139
Total derivatives	8,074		—		8,074
December 31, 2016
Assets:
Derivatives subject to master netting agreements	$	13,111	$	—	$	13,111	$	(3,391	)	$	—		$	9,720
Derivatives not subject to master netting agreements	455		—		455
Total derivatives	13,566		—		13,566
Liabilities:
Derivatives subject to master netting agreements	13,124		—		13,124		(3,391		)	(5,292		)	4,441
Derivatives not subject to master netting agreements	215		—		215
Total derivatives	13,339		—		13,339

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Resale and Repurchase Agreements Resale and Repurchase Agreements (Tables)

12 Months Ended

Dec. 31, 2017

Offsetting [Abstract]

Offsetting, Resale and Repurchase Agreements [Table Text Block]

The following table shows the extent to which assets and liabilities relating to securities purchased under agreements to resell (resale agreements) and securities sold under agreements to repurchase (repurchase agreements) have been offset in the consolidated balance sheets, in addition to the extent to which they could potentially be offset. Also shown is collateral received or pledged, which consists of marketable securities. The collateral amounts in the table are limited to the outstanding balances of the related asset or liability (after netting is applied); thus amounts of excess collateral are not shown. The agreements in the following table were transacted under master netting arrangements that contain a conditional right of offset, such as close-out netting, upon default.

Resale and repurchase agreements are agreements to purchase/sell securities subject to an obligation to resell/repurchase the same or similar securities. They are accounted for as collateralized financing transactions, not as sales and purchases of the securities portfolio. The securities collateral accepted or pledged in resale and repurchase agreements with other financial institutions also may be sold or re-pledged by the secured party, but is usually delivered to and held by third party trustees. The Company generally retains custody of securities pledged for repurchase agreements with customers.

The Company is party to several agreements commonly known as collateral swaps. These agreements involve the exchange of collateral under simultaneous repurchase and resale agreements with the same financial institution counterparty. These repurchase and resale agreements have the same principal amounts, inception dates, and maturity dates and have been offset against each other in the balance sheet, having met the accounting requirements for this treatment. The collateral swaps totaled $650.0 million at December 31, 2017 and $550.0 million at December 31, 2016. At December 31, 2017, the Company had posted collateral of $661.4 million in marketable securities, consisting of agency mortgage-backed bonds and treasuries, and had accepted $661.3 million in investment grade asset-backed, commercial mortgage-backed, and corporate bonds.

								Gross Amounts Not Offset in the Balance Sheet
(In thousands)	Gross Amount Recognized		Gross Amounts Offset in the Balance Sheet			Net Amounts Presented in the Balance Sheet		Financial Instruments Available for Offset		Securities Collateral Received/Pledged			Net Amount
December 31, 2017
Total resale agreements, subject to master netting arrangements	$	1,350,000	$	(650,000	)	$	700,000	$	—	$	(700,000	)	$	—
Total repurchase agreements, subject to master netting arrangements	1,954,768		(650,000		)	1,304,768		—		(1,304,768		)	—
December 31, 2016
Total resale agreements, subject to master netting arrangements	$	1,275,000	$	(550,000	)	$	725,000	$	—	$	(725,000	)	$	—
Total repurchase agreements, subject to master netting arrangements	2,221,065		(550,000		)	1,671,065		—		(1,671,065		)	—

Schedule of Underlying Assets of Repurchase Agreements [Table Text Block]

The table below shows the remaining contractual maturities of repurchase agreements outstanding at December 31, 2017 and 2016, in addition to the various types of marketable securities that have been pledged as collateral for these borrowings.

	Remaining Contractual Maturity of the Agreements
(In thousands)	Overnight and continuous		Up to 90 days		Greater than 90 days		Total
December 31, 2017
Repurchase agreements, secured by:
U.S. government and federal agency obligations	$	271,820	$	1,731	$	450,000	$	723,551
Government-sponsored enterprise obligations	149,111		—		—		149,111
Agency mortgage-backed securities	737,975		9,750		200,000		947,725
Asset-backed securities	89,601		30,000		—		119,601
Other debt securities	14,780		—		—		14,780
Total repurchase agreements, gross amount recognized	$	1,263,287	$	41,481	$	650,000	$	1,954,768
December 31, 2016
Repurchase agreements, secured by:
U.S. government and federal agency obligations	$	294,600	$	—	$	300,000	$	594,600
Government-sponsored enterprise obligations	147,694		—		3,237		150,931
Agency mortgage-backed securities	693,851		24,380		252,473		970,704
Asset-backed securities	474,830		30,000		—		504,830
Total repurchase agreements, gross amount recognized	$	1,610,975	$	54,380	$	555,710	$	2,221,065

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Commitments, Contingencies And Guarantees (Tables)

12 Months Ended

Dec. 31, 2017

Commitments and Contingencies Disclosure [Abstract]

Summary Of Minimum Lease Commitments

A summary of minimum lease commitments follows:

(In thousands)	Type of Property
Year Ended December 31	Real Property		Equipment		Total
2018	$	5,981	$	215	$	6,196
2019	4,876		75		4,951
2020	3,861		32		3,893
2021	3,162		14		3,176
2022	2,678		—		2,678
After	13,383		—		13,383
Total minimum lease payments					$	34,277

Schedule Of Off-Balance Sheet Instruments Commitments

The following table summarizes these commitments at December 31:

(In thousands)	2017		2016
Commitments to extend credit:
Credit card	$	5,102,556	$	4,932,955
Other	5,737,181		5,508,686
Standby letters of credit, net of participations	387,811		391,899
Commercial letters of credit	4,498		2,962

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Related Parties (Tables)

12 Months Ended

Dec. 31, 2017

Related Party Transactions [Abstract]

Schedule Of Related Party Expenses

The Company’s Chief Executive Officer, its Vice Chairman, and its President are directors of Tower Properties Company (Tower) and, together with members of their immediate families, beneficially own approximately 66% of the outstanding stock of Tower. At December 31, 2017, Tower owned 270,646 shares of Company stock. Tower is primarily engaged in the business of owning, developing, leasing and managing real property.

Payments from the Company and its affiliates to Tower are summarized below. These payments, with the exception of dividend payments, relate to property management services, including construction oversight, on three Company-owned office buildings and related parking garages in downtown Kansas City.

(In thousands)	2017		2016		2015
Leasing agent fees	$	32	$	101	$	66
Operation of parking garages	82		184		75
Building management fees	1,954		1,832		1,850
Property construction management fees	146		147		322
Dividends paid on Company stock held by Tower	232		221		210
Total	$	2,446	$	2,485	$	2,523

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Parent Company Condensed Financial Statements (Tables)

12 Months Ended

Dec. 31, 2017

Condensed Financial Information of Parent Company Only Disclosure [Abstract]

Condensed Balance Sheets

Condensed Balance Sheets
	December 31
(In thousands)	2017		2016
Assets
Investment in consolidated subsidiaries:
Bank	$	2,409,098	$	2,246,060
Non-banks	52,479		51,816
Cash	151,607		51
Securities purchased under agreements to resell	—		155,775
Investment securities:
Available for sale	53,285		58,051
Non-marketable	655		718
Note receivable due from bank subsidiary	50,000		—
Advances to subsidiaries, net of borrowings	14,571		5,053
Income tax benefits	8,279		524
Other assets	19,951		17,716
Total assets	$	2,759,925	$	2,535,764
Liabilities and stockholders’ equity
Pension obligation	$	12,407	$	17,158
Other liabilities	30,958		22,823
Total liabilities	43,365		39,981
Stockholders’ equity	2,716,560		2,495,783
Total liabilities and stockholders’ equity	$	2,759,925	$	2,535,764

Condensed Statements Of Income

Condensed Statements of Income
	For the Years Ended December 31
(In thousands)	2017			2016			2015
Income
Dividends received from consolidated bank subsidiary	$	160,002		$	160,002		$	160,001
Earnings of consolidated subsidiaries, net of dividends	147,678			118,704			106,636
Interest and dividends on investment securities	2,099			2,364			2,272
Management fees charged to subsidiaries	30,431			30,965			25,713
Investment securities gains	41,717			1,880			—
Net interest income on advances and note to subsidiaries	514			21			4
Other	3,346			2,720			1,422
Total income	385,787			316,656			296,048
Expense
Salaries and employee benefits	33,714			29,116			22,167
Professional fees	2,036			1,951			1,833
Data processing fees paid to affiliates	3,512			3,226			3,186
Community service	32,093			1,620			991
Other	10,671			9,849			8,278
Total expense	82,026			45,762			36,455
Income tax benefit	(15,622		)	(4,497		)	(4,137		)
Net income	$	319,383		$	275,391		$	263,730

Condensed Statements Of Cash Flows

Condensed Statements of Cash Flows
	For the Years Ended December 31
(In thousands)	2017			2016			2015
Operating Activities
Net income	$	319,383		$	275,391		$	263,730
Adjustments to reconcile net income to net cash provided by operating activities:
Earnings of consolidated subsidiaries, net of dividends	(147,678		)	(118,704		)	(106,636		)
Other adjustments, net	(11,268		)	9,541			(1,152		)
Net cash provided by operating activities	160,437			166,228			155,942
Investing Activities
(Increase) decrease in securities purchased under agreements to resell	155,775			(51,335		)	57,210
(Increase) decrease in investment in subsidiaries, net	11			4			(6		)
Proceeds from sales of investment securities	11,006			2,949			—
Proceeds from maturities/pay downs of investment securities	2,295			4,105			3,516
Purchases of investment securities	—			—			(2,500		)
Note receivable due from bank subsidiary	(50,000		)	—			—
(Increase) decrease in advances to subsidiaries, net	(9,518		)	13,507			1,171
Net purchases of building improvements and equipment	(52		)	(3		)	(113		)
Net cash provided by (used in) investing activities	109,517			(30,773		)	59,278
Financing Activities
Purchases of treasury stock	(17,771		)	(39,381		)	(23,176		)
Accelerated share repurchase agreements	—			—			(100,000		)
Issuance of stock under equity compensation plans	(8		)	(6		)	1,914
Cash dividends paid on common stock	(91,619		)	(87,070		)	(84,961		)
Cash dividends paid on preferred stock	(9,000		)	(9,000		)	(9,000		)
Net cash used in financing activities	(118,398		)	(135,457		)	(215,223		)
Increase (decrease) in cash	151,556			(2		)	(3		)
Cash at beginning of year	51			53			56
Cash at end of year	$	151,607		$	51		$	53
Income tax payments (receipts), net	$	(8,991	)	$	(8,958	)	$	1,278

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Summary of Significant Accounting Policies (Details)	12 Months Ended
	Dec. 31, 2017
Buildings [Member]
Property, Plant and Equipment [Line Items]
Depreciable lives for asset, years	30 years
Building Improvements [Member]
Property, Plant and Equipment [Line Items]
Depreciable lives for asset, years	10 years
Equipment [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Depreciable lives for asset, years	3 years
Equipment [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Depreciable lives for asset, years	10 years
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Depreciable lives for asset, years	10 years
Core Deposits [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Core deposit intangibles amortized over useful life, years	8 years
Core Deposits [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Core deposit intangibles amortized over useful life, years	14 years

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Summary of Significant Accounting Policies Significant Accounting Policies (Narrative) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2017 USD ($) Locations
Derivative [Line Items]
Locations | Locations	330
Federal Reserve Bank Reserve Requirement	$ 126.1
Cash Held at Federal Reserve Bank	$ 30.6
Amortization period of annual fees on credit card loans, months	12 months
Period past due loans are placed on non-accrual, days	90 days
Consumer loans charged down to fair value, days delinquent	120 days
Period past due credit card loans are charged off, days	180 days
Common stock dividend rate percentage	5.00%
Swaps with Central Clearing Agency [Member] | Cash [Member]
Derivative [Line Items]
Value Of Collateral Posted	$ 12.5

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Loans And Allowance For Loan Losses (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Loans And Allowance For Loan Losses [Abstract]
Loans To Principal Holders (over 10% ownership in the Company's stock)	$ 0
Unfunded Loan Commitments	10,800,000,000
Unused Approved Credit Card Lines of Credit	5,100,000,000
Loans pledged at the Federal Home Loan Bank as collateral for borrowings and letters of credit obtained to secure public deposits	3,800,000,000
Loans pledged at the Federal Reserve Bank as collateral for discount window borrowings	1,700,000,000
Net Investment in Direct Financing and Sales Type Leases	737,700,000	$ 725,300,000
Capital Leases, Net Investment in Sales Type Leases, Deferred Income	52,100,000	49,900,000
Property Subject to or Available for Operating Lease, Net	17,400,000	19,000,000
Decrease in interest income resulting from modification to credit card loans	(1,000,000)
Commitments to lend additional funds to customers with restructured loans	7,600,000	10,300,000
Loans Held-for-sale, Fair Value Disclosure	15,300,000
Unpaid Principal Balance on Personal Real Estate Loans Held for Sale	14,800,000
Personal Real Estate Loans HFS Past Due	0
Personal Real Estate Loans HFS on Non-Accrual Status	0
Student Loans Held for Sale, Lower of Cost or Fair Value	6,100,000
HFS Student Loans on Non-Accrual Status	0
HFS Student Loans Past Due	0
Foreclosed real estate	681,000	366,000
Personal property acquired in repossession	$ 2,700,000	$ 2,200,000

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Loans And Allowance For Loan Losses (Summary Classification Of Held To Maturity Loan Portfolio) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Loans And Allowance For Loan Losses [Line Items]
Total loans	$ 13,983,674	$ 13,412,736
Business [Member]
Loans And Allowance For Loan Losses [Line Items]
Total loans	4,958,554	4,776,365
Real Estate - Construction And Land [Member]
Loans And Allowance For Loan Losses [Line Items]
Total loans	968,820	791,236
Real Estate - Business [Member]
Loans And Allowance For Loan Losses [Line Items]
Total loans	2,697,452	2,643,374
Real Estate - Personal [Member]
Loans And Allowance For Loan Losses [Line Items]
Total loans	2,062,787	2,010,397
Consumer [Member]
Loans And Allowance For Loan Losses [Line Items]
Total loans	2,104,487	1,990,801
Revolving Home Equity [Member]
Loans And Allowance For Loan Losses [Line Items]
Total loans	400,587	413,634
Consumer Credit Card [Member]
Loans And Allowance For Loan Losses [Line Items]
Total loans	783,864	776,465
Overdrafts [Member]
Loans And Allowance For Loan Losses [Line Items]
Total loans	$ 7,123	$ 10,464

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Loans And Allowance For Loan Losses Loans And Allowance For Loan Losses (Loans to Directors and Executive Officers) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2016 USD ($)
Loans and Leases Receivable, Related Parties [Roll Forward]
Loans to directors and executive officers, beginning balance	$ 62,991
Additions	655,544
Amounts collected	(639,920)
Amounts written off	0
Loans to directors and executive officers, ending balance	$ 78,615

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Loans And Allowance For Loan Losses (Summary Of Activity In The Allowance For Loan Losses) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of period	$ 155,932	$ 151,532	$ 156,532
Provision for Loan, Lease, and Other Losses	45,244	36,318	28,727
Loans charged off	55,179	50,978	51,050
Less recoveries	13,535	19,060	17,323
Allowance for Loan and Lease Losses Write-offs, Net	41,644	31,918	33,727
Balance at end of period	159,532	155,932	151,532
Commercial Portfolio Segment [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of period	91,361	82,086	89,622
Provision for Loan, Lease, and Other Losses	2,327	4,898	(9,319)
Loans charged off	2,538	3,258	4,057
Less recoveries	2,554	7,635	5,840
Allowance for Loan and Lease Losses Write-offs, Net	(16)	(4,377)	(1,783)
Balance at end of period	93,704	91,361	82,086
Personal Banking Portfolio Segment [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of period	64,571	69,446	66,910
Provision for Loan, Lease, and Other Losses	42,917	31,420	38,046
Loans charged off	52,641	47,720	46,993
Less recoveries	10,981	11,425	11,483
Allowance for Loan and Lease Losses Write-offs, Net	41,660	36,295	35,510
Balance at end of period	$ 65,828	$ 64,571	$ 69,446

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Loans And Allowance For Loan Losses (Allowance For Loan Losses And Related Loan Balance Disaggregated On The Basis Of Impairment Methodology) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Loans And Allowance For Loan Losses [Line Items]
Impaired loans, Allowance for loan losses	$ 4,243	$ 3,109
All other loans, Allowance for loan losses	155,289	152,823
Impaired loans, Loans outstanding	114,795	64,532
All other loans, Loans outstanding	13,868,879	13,348,204
Commercial Portfolio Segment [Member]
Loans And Allowance For Loan Losses [Line Items]
Impaired loans, Allowance for loan losses	3,067	1,817
All other loans, Allowance for loan losses	90,637	89,544
Impaired loans, Loans outstanding	92,613	44,795
All other loans, Loans outstanding	8,532,213	8,166,180
Personal Banking Portfolio Segment [Member]
Loans And Allowance For Loan Losses [Line Items]
Impaired loans, Allowance for loan losses	1,176	1,292
All other loans, Allowance for loan losses	64,652	63,279
Impaired loans, Loans outstanding	22,182	19,737
All other loans, Loans outstanding	$ 5,336,666	$ 5,182,024

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Loans And Allowance For Loan Losses (Investment In Impaired Loans) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Loans And Allowance For Loan Losses [Abstract]
Non-accrual loans	$ 11,983	$ 14,283
Restructured loans (accruing)	102,812	50,249
Total impaired loans	$ 114,795	$ 64,532

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Loans And Allowance For Loan Losses (Additional Information About Impaired Loans Held) (Details) - USD ($)	Dec. 31, 2017	Dec. 31, 2016
Loans And Allowance For Loan Losses [Line Items]
Impaired Financing Receivable, Recorded Investment	$ 114,795,000	$ 64,532,000
Impaired Financing Receivable, Unpaid Principal Balance	122,429,000	73,703,000
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	7,434,000	7,932,000
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	11,120,000	11,222,000
Impaired Financing Receivable, with No Related Allowance, Allowance	0	0
Impaired Financing Receivable, with Related Allowance, Recorded Investment	107,361,000	56,600,000
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	111,309,000	62,481,000
Impaired Financing Receivable, Related Allowance	4,243,000	3,109,000
Business [Member]
Loans And Allowance For Loan Losses [Line Items]
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	5,356,000	7,375,000
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	9,000,000	10,470,000
Impaired Financing Receivable, with No Related Allowance, Allowance	0	0
Impaired Financing Receivable, with Related Allowance, Recorded Investment	72,589,000	29,924,000
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	73,168,000	31,795,000
Impaired Financing Receivable, Related Allowance	2,455,000	1,318,000
Real Estate - Construction And Land [Member]
Loans And Allowance For Loan Losses [Line Items]
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	0	557,000
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	0	752,000
Impaired Financing Receivable, with No Related Allowance, Allowance	0	0
Impaired Financing Receivable, with Related Allowance, Recorded Investment	837,000	69,000
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	841,000	72,000
Impaired Financing Receivable, Related Allowance	27,000	3,000
Real Estate - Business [Member]
Loans And Allowance For Loan Losses [Line Items]
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	1,299,000	0
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	1,303,000	0
Impaired Financing Receivable, with No Related Allowance, Allowance	0	0
Impaired Financing Receivable, with Related Allowance, Recorded Investment	12,532,000	6,870,000
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	13,071,000	8,072,000
Impaired Financing Receivable, Related Allowance	585,000	496,000
Real Estate - Personal [Member]
Loans And Allowance For Loan Losses [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	9,126,000	6,394,000
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	11,914,000	9,199,000
Impaired Financing Receivable, Related Allowance	532,000	642,000
Consumer [Member]
Loans And Allowance For Loan Losses [Line Items]
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	779,000	0
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	817,000	0
Impaired Financing Receivable, with No Related Allowance, Allowance	0	0
Impaired Financing Receivable, with Related Allowance, Recorded Investment	5,388,000	5,281,000
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	5,426,000	5,281,000
Impaired Financing Receivable, Related Allowance	67,000	57,000
Revolving Home Equity [Member]
Loans And Allowance For Loan Losses [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	204,000	584,000
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	204,000	584,000
Impaired Financing Receivable, Related Allowance	11,000	1,000
Consumer Credit Card [Member]
Loans And Allowance For Loan Losses [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	6,685,000	7,478,000
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	6,685,000	7,478,000
Impaired Financing Receivable, Related Allowance	$ 566,000	$ 592,000

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Loans And Allowance For Loan Losses (Total Average Impaired Loans) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Loans And Allowance For Loan Losses [Line Items]
Non-accrual loans	$ 13,647	$ 21,429
Restructured loans (accruing)	66,609	49,353
Average impaired loans	80,256	70,782
Commercial Portfolio Segment [Member]
Loans And Allowance For Loan Losses [Line Items]
Non-accrual loans	9,658	17,294
Restructured loans (accruing)	49,070	32,295
Average impaired loans	58,728	49,589
Personal Banking Portfolio Segment [Member]
Loans And Allowance For Loan Losses [Line Items]
Non-accrual loans	3,989	4,135
Restructured loans (accruing)	17,539	17,058
Average impaired loans	$ 21,528	$ 21,193

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Loans And Allowance For Loan Losses (Interest Income Recognized on Impaired Loans) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Loans And Allowance For Loan Losses [Line Items]
Interest income recognized on impaired loans	$ 5,082	$ 2,481	$ 2,002
Business [Member]
Loans And Allowance For Loan Losses [Line Items]
Interest income recognized on impaired loans	3,135	1,064	495
Real Estate - Construction And Land [Member]
Loans And Allowance For Loan Losses [Line Items]
Interest income recognized on impaired loans	41	2	80
Real Estate - Business [Member]
Loans And Allowance For Loan Losses [Line Items]
Interest income recognized on impaired loans	514	171	122
Real Estate - Personal [Member]
Loans And Allowance For Loan Losses [Line Items]
Interest income recognized on impaired loans	402	152	187
Consumer [Member]
Loans And Allowance For Loan Losses [Line Items]
Interest income recognized on impaired loans	307	339	348
Revolving Home Equity [Member]
Loans And Allowance For Loan Losses [Line Items]
Interest income recognized on impaired loans	10	31	20
Consumer Credit Card [Member]
Loans And Allowance For Loan Losses [Line Items]
Interest income recognized on impaired loans	$ 673	$ 722	$ 750

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Loans And Allowance For Loan Losses (Aging Information On Past Due And Accruing Loans) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Loans And Allowance For Loan Losses [Line Items]
Current or Less than 30 days Past Due	$ 13,897,272	$ 13,324,515
30 – 89 Days Past Due	56,292	57,542
90 Days Past Due and Still Accruing	18,127	16,396
Non-accrual	11,983	14,283
Total	13,983,674	13,412,736
Business [Member]
Loans And Allowance For Loan Losses [Line Items]
Total	4,958,554	4,776,365
Real Estate - Construction And Land [Member]
Loans And Allowance For Loan Losses [Line Items]
Total	968,820	791,236
Real Estate - Business [Member]
Loans And Allowance For Loan Losses [Line Items]
Total	2,697,452	2,643,374
Real Estate - Personal [Member]
Loans And Allowance For Loan Losses [Line Items]
Total	2,062,787	2,010,397
Consumer [Member]
Loans And Allowance For Loan Losses [Line Items]
Total	2,104,487	1,990,801
Revolving Home Equity [Member]
Loans And Allowance For Loan Losses [Line Items]
Total	400,587	413,634
Consumer Credit Card [Member]
Loans And Allowance For Loan Losses [Line Items]
Total	783,864	776,465
Overdrafts [Member]
Loans And Allowance For Loan Losses [Line Items]
Total	7,123	10,464
Commercial Portfolio Segment [Member] | Business [Member]
Loans And Allowance For Loan Losses [Line Items]
Current or Less than 30 days Past Due	4,949,148	4,763,274
30 – 89 Days Past Due	3,085	3,735
90 Days Past Due and Still Accruing	374	674
Non-accrual	5,947	8,682
Commercial Portfolio Segment [Member] | Real Estate - Construction And Land [Member]
Loans And Allowance For Loan Losses [Line Items]
Current or Less than 30 days Past Due	967,321	789,633
30 – 89 Days Past Due	1,473	1,039
90 Days Past Due and Still Accruing	21	0
Non-accrual	5	564
Commercial Portfolio Segment [Member] | Real Estate - Business [Member]
Loans And Allowance For Loan Losses [Line Items]
Current or Less than 30 days Past Due	2,694,234	2,639,586
30 – 89 Days Past Due	482	2,154
90 Days Past Due and Still Accruing	0	0
Non-accrual	2,736	1,634
Personal Banking Portfolio Segment [Member] | Real Estate - Personal [Member]
Loans And Allowance For Loan Losses [Line Items]
Current or Less than 30 days Past Due	2,050,787	1,995,724
30 – 89 Days Past Due	6,218	9,162
90 Days Past Due and Still Accruing	3,321	2,108
Non-accrual	2,461	3,403
Personal Banking Portfolio Segment [Member] | Consumer [Member]
Loans And Allowance For Loan Losses [Line Items]
Current or Less than 30 days Past Due	2,067,025	1,957,358
30 – 89 Days Past Due	32,674	29,783
90 Days Past Due and Still Accruing	3,954	3,660
Non-accrual	834	0
Personal Banking Portfolio Segment [Member] | Revolving Home Equity [Member]
Loans And Allowance For Loan Losses [Line Items]
Current or Less than 30 days Past Due	397,349	411,483
30 – 89 Days Past Due	1,962	1,032
90 Days Past Due and Still Accruing	1,276	1,119
Non-accrual	0	0
Personal Banking Portfolio Segment [Member] | Consumer Credit Card [Member]
Loans And Allowance For Loan Losses [Line Items]
Current or Less than 30 days Past Due	764,568	757,443
30 – 89 Days Past Due	10,115	10,187
90 Days Past Due and Still Accruing	9,181	8,835
Non-accrual	0	0
Personal Banking Portfolio Segment [Member] | Overdrafts [Member]
Loans And Allowance For Loan Losses [Line Items]
Current or Less than 30 days Past Due	6,840	10,014
30 – 89 Days Past Due	283	450
90 Days Past Due and Still Accruing	0	0
Non-accrual	$ 0	$ 0

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Loans And Allowance For Loan Losses (Credit Quality Of Commercial Loan Portfolio) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Loans And Allowance For Loan Losses [Line Items]
Commercial Loan Portfolio Gross Carrying Amount	$ 8,624,826	$ 8,210,975
Pass [Member]
Loans And Allowance For Loan Losses [Line Items]
Commercial Loan Portfolio Gross Carrying Amount	8,288,517	7,939,679
Special Mention [Member]
Loans And Allowance For Loan Losses [Line Items]
Commercial Loan Portfolio Gross Carrying Amount	120,368	162,843
Substandard [Member]
Loans And Allowance For Loan Losses [Line Items]
Commercial Loan Portfolio Gross Carrying Amount	207,253	97,573
Non-Accrual [Member]
Loans And Allowance For Loan Losses [Line Items]
Commercial Loan Portfolio Gross Carrying Amount	8,688	10,880
Business [Member]
Loans And Allowance For Loan Losses [Line Items]
Commercial Loan Portfolio Gross Carrying Amount	4,958,554	4,776,365
Real Estate - Construction And Land [Member]
Loans And Allowance For Loan Losses [Line Items]
Commercial Loan Portfolio Gross Carrying Amount	968,820	791,236
Real Estate - Business [Member]
Loans And Allowance For Loan Losses [Line Items]
Commercial Loan Portfolio Gross Carrying Amount	2,697,452	2,643,374
Commercial Portfolio Segment [Member] | Business [Member] | Pass [Member]
Loans And Allowance For Loan Losses [Line Items]
Commercial Loan Portfolio Gross Carrying Amount	4,740,013	4,607,553
Commercial Portfolio Segment [Member] | Business [Member] | Special Mention [Member]
Loans And Allowance For Loan Losses [Line Items]
Commercial Loan Portfolio Gross Carrying Amount	59,177	116,642
Commercial Portfolio Segment [Member] | Business [Member] | Substandard [Member]
Loans And Allowance For Loan Losses [Line Items]
Commercial Loan Portfolio Gross Carrying Amount	153,417	43,488
Commercial Portfolio Segment [Member] | Business [Member] | Non-Accrual [Member]
Loans And Allowance For Loan Losses [Line Items]
Commercial Loan Portfolio Gross Carrying Amount	5,947	8,682
Commercial Portfolio Segment [Member] | Real Estate - Construction And Land [Member] | Pass [Member]
Loans And Allowance For Loan Losses [Line Items]
Commercial Loan Portfolio Gross Carrying Amount	955,499	788,778
Commercial Portfolio Segment [Member] | Real Estate - Construction And Land [Member] | Special Mention [Member]
Loans And Allowance For Loan Losses [Line Items]
Commercial Loan Portfolio Gross Carrying Amount	10,614	722
Commercial Portfolio Segment [Member] | Real Estate - Construction And Land [Member] | Substandard [Member]
Loans And Allowance For Loan Losses [Line Items]
Commercial Loan Portfolio Gross Carrying Amount	2,702	1,172
Commercial Portfolio Segment [Member] | Real Estate - Construction And Land [Member] | Non-Accrual [Member]
Loans And Allowance For Loan Losses [Line Items]
Commercial Loan Portfolio Gross Carrying Amount	5	564
Commercial Portfolio Segment [Member] | Real Estate - Business [Member] | Pass [Member]
Loans And Allowance For Loan Losses [Line Items]
Commercial Loan Portfolio Gross Carrying Amount	2,593,005	2,543,348
Commercial Portfolio Segment [Member] | Real Estate - Business [Member] | Special Mention [Member]
Loans And Allowance For Loan Losses [Line Items]
Commercial Loan Portfolio Gross Carrying Amount	50,577	45,479
Commercial Portfolio Segment [Member] | Real Estate - Business [Member] | Substandard [Member]
Loans And Allowance For Loan Losses [Line Items]
Commercial Loan Portfolio Gross Carrying Amount	51,134	52,913
Commercial Portfolio Segment [Member] | Real Estate - Business [Member] | Non-Accrual [Member]
Loans And Allowance For Loan Losses [Line Items]
Commercial Loan Portfolio Gross Carrying Amount	$ 2,736	$ 1,634

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Loans And Allowance For Loan Losses (Summary Of Loans In The Personal Banking Portfolio Percentage Of Balances Outstanding ) (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Loans And Allowance For Loan Losses [Abstract]
Credit Quality Personal Real Estate Loans Excluded	$ 219.2	$ 237.2
Consumer Healthcare Loans Excluded	$ 145.0	$ 75.4
Credit quality personal banking loan table percentage loans excluded	7.00%
Real Estate - Personal [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	100.00%	100.00%
Real Estate - Personal [Member] | Under 600 [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	1.30%	1.30%
Real Estate - Personal [Member] | 600 - 659 [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	2.10%	2.60%
Real Estate - Personal [Member] | 660 - 719 [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	10.50%	10.40%
Real Estate - Personal [Member] | 720 - 779 [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	25.60%	25.40%
Real Estate - Personal [Member] | 780 and over [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	60.50%	60.30%
Consumer [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	100.00%	100.00%
Consumer [Member] | Under 600 [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	3.30%	3.40%
Consumer [Member] | 600 - 659 [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	5.50%	6.40%
Consumer [Member] | 660 - 719 [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	17.30%	19.70%
Consumer [Member] | 720 - 779 [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	26.80%	26.30%
Consumer [Member] | 780 and over [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	47.10%	44.20%
Revolving Home Equity [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	100.00%	100.00%
Revolving Home Equity [Member] | Under 600 [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	1.10%	1.00%
Revolving Home Equity [Member] | 600 - 659 [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	1.70%	1.80%
Revolving Home Equity [Member] | 660 - 719 [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	9.50%	9.70%
Revolving Home Equity [Member] | 720 - 779 [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	21.40%	21.10%
Revolving Home Equity [Member] | 780 and over [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	66.30%	66.40%
Consumer Credit Card [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	100.00%	100.00%
Consumer Credit Card [Member] | Under 600 [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	4.70%	4.90%
Consumer Credit Card [Member] | 600 - 659 [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	14.40%	15.50%
Consumer Credit Card [Member] | 660 - 719 [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	34.40%	34.90%
Consumer Credit Card [Member] | 720 - 779 [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	26.00%	25.10%
Consumer Credit Card [Member] | 780 and over [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	20.50%	19.60%

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Loans And Allowance For Loan Losses (Outstanding Balance Of Loans Classified As Troubled Debt Restructurings) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Loans And Allowance For Loan Losses [Line Items]
Restructured loans	$ 110,608	$ 59,074
Balance 90 days past due at any time during previous 12 months	1,031
Commercial Portfolio Segment [Member] | Business [Member]
Loans And Allowance For Loan Losses [Line Items]
Restructured loans	77,400
Balance 90 days past due at any time during previous 12 months	0
Commercial Portfolio Segment [Member] | Real Estate - Construction And Land [Member]
Loans And Allowance For Loan Losses [Line Items]
Restructured loans	776
Balance 90 days past due at any time during previous 12 months	0
Commercial Portfolio Segment [Member] | Real Estate - Business [Member]
Loans And Allowance For Loan Losses [Line Items]
Restructured loans	12,394
Balance 90 days past due at any time during previous 12 months	0
Personal Banking Portfolio Segment [Member] | Real Estate - Personal [Member]
Loans And Allowance For Loan Losses [Line Items]
Restructured loans	7,760
Balance 90 days past due at any time during previous 12 months	278
Personal Banking Portfolio Segment [Member] | Consumer [Member]
Loans And Allowance For Loan Losses [Line Items]
Restructured loans	5,389
Balance 90 days past due at any time during previous 12 months	81
Personal Banking Portfolio Segment [Member] | Revolving Home Equity [Member]
Loans And Allowance For Loan Losses [Line Items]
Restructured loans	204
Balance 90 days past due at any time during previous 12 months	42
Personal Banking Portfolio Segment [Member] | Consumer Credit Card [Member]
Loans And Allowance For Loan Losses [Line Items]
Restructured loans	6,685
Balance 90 days past due at any time during previous 12 months	$ 630

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Loans And Allowance For Loan Losses Troubled Debt Restructurings by Type of Modification (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Troubled Debt Restructuring by Type of Modification [Abstract]
Change in troubled debt restructured non-market interest rate loan balance	$ 54,100
Large business loan renewed in current year at non-market rate	31,900
Financing Receivable, Modifications [Line Items]
Restructured loans	110,608	$ 59,074
TDR Non-market interest rates [Member]
Financing Receivable, Modifications [Line Items]
Restructured loans	88,588	34,531
TDR Assistance programs [Member]
Financing Receivable, Modifications [Line Items]
Restructured loans	6,685	7,478
TDR-Bankruptcy non-affirmation [Member]
Financing Receivable, Modifications [Line Items]
Restructured loans	7,283	7,937
TDR Other [Member]
Financing Receivable, Modifications [Line Items]
Restructured loans	256	303
TDR Non-accrual loans [Member]
Financing Receivable, Modifications [Line Items]
Restructured loans	$ 7,796	$ 8,825

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Investment Securities (Narrative) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2017 USD ($) Securities Investments_In_Single_Issuer	Dec. 31, 2016 USD ($) Securities	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Investment [Line Items]
Non-marketable FHLB and FRB stock held for debt and regulatory purposes	$ 43,300	$ 46,900
Non-marketable private equity investments held	57,200	52,300
U.S. Treasury inflation-protected securities held	$ 442,100
Percentage decrease requiring a review for impairment	20.00%
Fair value of securities on other-than-temporary impairment watch list	$ 68,000	79,600
Cumulative, credit-related portion of impairment (recorded in earnings) on the certain non-agency mortgage-backed securities on the watch list	$ 14,199	$ 14,080	$ 14,129	$ 13,734
Number of individual securities held in the available for sale portfolio | Securities	2,000
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | Securities	635	771
Portfolio securities aggregate fair value loss position	$ 5,172,412	$ 4,480,405
Available for sale securities in loss position at period end, change in unrealized loss	(16,800)
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	44,122	60,942
Fair value of securities in loss position for twelve months or longer	$ 1,156,715	444,252
Fair value of securities in a loss position for 12 months or longer, as a percentage of total available for sale portfolio	13.20%
Available for sale securities	$ 8,774,280	9,649,203
Securities pledged as collateral	3,800,000	4,400,000
Securities pledged and may be sold or re-pledged	$ 662,500
Number of investments in a single issuer that exceed 10% of stockholder's equity | Investments_In_Single_Issuer	0
No investment in a single issuer exceeds this percentage of stockholder's equity	10.00%
State and municipal obligations [Member]
Investment [Line Items]
Auction rate securities held at fair value	$ 17,000
Portfolio securities aggregate fair value loss position	332,182	715,974
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	2,754	12,693
Fair value of securities in loss position for twelve months or longer	49,339	15,195
Available for sale securities	$ 1,611,366	1,778,214
State and municipal obligation portfolio, as a percentage of total available for sale securities	18.40%
Equity securities [Member]
Investment [Line Items]
Common stock classified as equity securities held by the holding company	$ 45,900
Available for sale securities	48,838	51,263
Non-agency mortgage-backed securities [Member]
Investment [Line Items]
Fair value of securities on other-than-temporary impairment watch list	26,200
Cumulative, credit-related portion of impairment (recorded in earnings) on the certain non-agency mortgage-backed securities on the watch list	14,200
Portfolio securities aggregate fair value loss position	730,830	723,077
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	4,837	6,493
Fair value of securities in loss position for twelve months or longer	153,813	34,946
Available for sale securities	$ 905,793	$ 1,055,639

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Investment Securities (Investment Securities, At Fair Value) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]
Available for sale securities	$ 8,774,280	$ 9,649,203
Trading securities	18,269	22,225
Non-marketable securities	100,758	99,558
Total investment securities	8,893,307	9,770,986
U.S. government and federal agency obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale securities	917,147	920,904
US Government-sponsored Enterprise Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale securities	406,363	449,998
State and municipal obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale securities	1,611,366	1,778,214
Agency mortgage-backed securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale securities	3,040,913	2,685,931
Non-agency mortgage-backed securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale securities	905,793	1,055,639
Asset-backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale securities	1,492,800	2,381,301
Other Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale securities	351,060	325,953
Equity securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale securities	$ 48,838	$ 51,263

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Investment Securities (Summary Of Available For Sale Investment Securities By Maturity Groupings) (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016
Investment [Line Items]
Amortized Cost		$ 8,719,867	$ 9,600,330
Fair Value		8,774,280	9,649,203
U.S. Government And Federal Agency Obligations [Member]
Investment [Line Items]
Amortized Cost		917,494	919,904
Fair Value		$ 917,147	920,904
Weighted Average Yield	[1]	1.24%
U.S. Government And Federal Agency Obligations [Member] | Maturity Within 1 Year [Member]
Investment [Line Items]
Amortized Cost		$ 57,983
Fair Value		$ 58,347
Weighted Average Yield	[1]	1.71%
U.S. Government And Federal Agency Obligations [Member] | Maturity After 1 But Within 5 Years [Member]
Investment [Line Items]
Amortized Cost		$ 641,114
Fair Value		$ 639,192
Weighted Average Yield	[1]	1.45%
U.S. Government And Federal Agency Obligations [Member] | Maturity After 5 But Within 10 Years [Member]
Investment [Line Items]
Amortized Cost		$ 149,589
Fair Value		$ 149,927
Weighted Average Yield	[1]	0.43%
U.S. Government And Federal Agency Obligations [Member] | Maturity After 10 Years [Member]
Investment [Line Items]
Amortized Cost		$ 68,808
Fair Value		$ 69,681
Weighted Average Yield	[1]	0.59%
US Government-sponsored Enterprise Debt Securities [Member]
Investment [Line Items]
Amortized Cost		$ 408,266	450,448
Fair Value		$ 406,363	449,998
Weighted Average Yield		1.79%
US Government-sponsored Enterprise Debt Securities [Member] | Maturity Within 1 Year [Member]
Investment [Line Items]
Amortized Cost		$ 215,763
Fair Value		$ 215,434
Weighted Average Yield		1.35%
US Government-sponsored Enterprise Debt Securities [Member] | Maturity After 1 But Within 5 Years [Member]
Investment [Line Items]
Amortized Cost		$ 121,575
Fair Value		$ 121,199
Weighted Average Yield		1.93%
US Government-sponsored Enterprise Debt Securities [Member] | Maturity After 5 But Within 10 Years [Member]
Investment [Line Items]
Amortized Cost		$ 34,983
Fair Value		$ 34,870
Weighted Average Yield		2.71%
US Government-sponsored Enterprise Debt Securities [Member] | Maturity After 10 Years [Member]
Investment [Line Items]
Amortized Cost		$ 35,945
Fair Value		$ 34,860
Weighted Average Yield		3.00%
State and municipal obligations [Member]
Investment [Line Items]
Amortized Cost		$ 1,592,707	1,778,684
Fair Value		$ 1,611,366	1,778,214
Weighted Average Yield		2.39%
State and municipal obligations [Member] | Maturity Within 1 Year [Member]
Investment [Line Items]
Amortized Cost		$ 164,756
Fair Value		$ 165,638
Weighted Average Yield		2.65%
State and municipal obligations [Member] | Maturity After 1 But Within 5 Years [Member]
Investment [Line Items]
Amortized Cost		$ 665,351
Fair Value		$ 670,953
Weighted Average Yield		2.21%
State and municipal obligations [Member] | Maturity After 5 But Within 10 Years [Member]
Investment [Line Items]
Amortized Cost		$ 709,248
Fair Value		$ 721,181
Weighted Average Yield		2.46%
State and municipal obligations [Member] | Maturity After 10 Years [Member]
Investment [Line Items]
Amortized Cost		$ 53,352
Fair Value		$ 53,594
Weighted Average Yield		3.01%
Agency mortgage-backed securities [Member]
Investment [Line Items]
Amortized Cost		$ 3,046,701	2,674,964
Fair Value		$ 3,040,913	2,685,931
Weighted Average Yield		2.62%
Non-agency mortgage-backed securities [Member]
Investment [Line Items]
Amortized Cost		$ 903,920	1,054,446
Fair Value		$ 905,793	1,055,639
Weighted Average Yield		2.54%
Asset-backed Securities [Member]
Investment [Line Items]
Amortized Cost		$ 1,495,380	2,389,176
Fair Value		$ 1,492,800	2,381,301
Weighted Average Yield		2.03%
Total mortgage and asset-backed securities [Member]
Investment [Line Items]
Amortized Cost		$ 5,446,001	6,118,586
Fair Value		$ 5,439,506	6,122,871
Weighted Average Yield		2.45%
Other Debt Securities [Member]
Investment [Line Items]
Amortized Cost		$ 350,988	327,030
Fair Value		351,060	325,953
Other Debt Securities [Member] | Maturity Within 1 Year [Member]
Investment [Line Items]
Amortized Cost		10,390
Fair Value		10,389
Other Debt Securities [Member] | Maturity After 1 But Within 5 Years [Member]
Investment [Line Items]
Amortized Cost		247,181
Fair Value		247,626
Other Debt Securities [Member] | Maturity After 5 But Within 10 Years [Member]
Investment [Line Items]
Amortized Cost		93,417
Fair Value		93,045
Equity securities [Member]
Investment [Line Items]
Amortized Cost		4,411	5,678
Fair Value		$ 48,838	$ 51,263

[1] Rate does not reflect inflation adjustment on inflation-protected securities

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Investment Securities (Available For Sale Securities Unrealized Gains And Losses, By Security Type) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Investment [Line Items]
Amortized Cost	$ 8,719,867	$ 9,600,330
Available For Sale Securities, Gross Unreailzed Gain at Period End	98,535	109,815
Available For Sale Securities, Gross Unrealized Loss at Period End	(44,122)	(60,942)
Fair Value	8,774,280	9,649,203
U.S. Government And Federal Agency Obligations [Member]
Investment [Line Items]
Amortized Cost	917,494	919,904
Available For Sale Securities, Gross Unreailzed Gain at Period End	4,096	7,312
Available For Sale Securities, Gross Unrealized Loss at Period End	(4,443)	(6,312)
Fair Value	917,147	920,904
US Government-sponsored Enterprise Debt Securities [Member]
Investment [Line Items]
Amortized Cost	408,266	450,448
Available For Sale Securities, Gross Unreailzed Gain at Period End	26	1,126
Available For Sale Securities, Gross Unrealized Loss at Period End	(1,929)	(1,576)
Fair Value	406,363	449,998
State and municipal obligations [Member]
Investment [Line Items]
Amortized Cost	1,592,707	1,778,684
Available For Sale Securities, Gross Unreailzed Gain at Period End	21,413	12,223
Available For Sale Securities, Gross Unrealized Loss at Period End	(2,754)	(12,693)
Fair Value	1,611,366	1,778,214
Agency mortgage-backed securities [Member]
Investment [Line Items]
Amortized Cost	3,046,701	2,674,964
Available For Sale Securities, Gross Unreailzed Gain at Period End	17,956	31,610
Available For Sale Securities, Gross Unrealized Loss at Period End	(23,744)	(20,643)
Fair Value	3,040,913	2,685,931
Non-agency mortgage-backed securities [Member]
Investment [Line Items]
Amortized Cost	903,920	1,054,446
Available For Sale Securities, Gross Unreailzed Gain at Period End	6,710	7,686
Available For Sale Securities, Gross Unrealized Loss at Period End	(4,837)	(6,493)
Fair Value	905,793	1,055,639
Asset-backed Securities [Member]
Investment [Line Items]
Amortized Cost	1,495,380	2,389,176
Available For Sale Securities, Gross Unreailzed Gain at Period End	2,657	3,338
Available For Sale Securities, Gross Unrealized Loss at Period End	(5,237)	(11,213)
Fair Value	1,492,800	2,381,301
Total mortgage and asset-backed securities [Member]
Investment [Line Items]
Amortized Cost	5,446,001	6,118,586
Available For Sale Securities, Gross Unreailzed Gain at Period End	27,323	42,634
Available For Sale Securities, Gross Unrealized Loss at Period End	(33,818)	(38,349)
Fair Value	5,439,506	6,122,871
Other Debt Securities [Member]
Investment [Line Items]
Amortized Cost	350,988	327,030
Available For Sale Securities, Gross Unreailzed Gain at Period End	1,250	935
Available For Sale Securities, Gross Unrealized Loss at Period End	(1,178)	(2,012)
Fair Value	351,060	325,953
Equity securities [Member]
Investment [Line Items]
Amortized Cost	4,411	5,678
Available For Sale Securities, Gross Unreailzed Gain at Period End	44,427	45,585
Available For Sale Securities, Gross Unrealized Loss at Period End	0	0
Fair Value	$ 48,838	$ 51,263

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Investment Securities (Cash Flow Model Inputs Used To Calculate Credit Losses) (Details)	Dec. 31, 2017
Minimum [Member]
Investment [Line Items]
Prepayment CPR	0.00%
Projected cumulative default	14.00%
Credit support	0.00%
Loss severity	15.00%
Maximum [Member]
Investment [Line Items]
Prepayment CPR	25.00%
Projected cumulative default	50.00%
Credit support	54.00%
Loss severity	63.00%

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Investment Securities (Changes In Recorded Credit Losses) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward]
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Credit Losses on Debt Securities Held	$ 14,199	$ 14,080	$ 14,129	$ 13,734
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Additions, No Previous Impairment	111	0	76
Credit losses on debt securities for which impairment was previously recognized	274	270	407
Increase in expected cash flows that are recognized over the remaining life of the security	$ (266)	$ (319)	$ (88)

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Investment Securities (Securities With Unrealized Losses And Length Of Impairment Period) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Investment [Line Items]
Less than 12 months, Fair Value	$ 4,015,697	$ 4,036,153
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	24,201	50,837
12 months or longer, Fair Value	1,156,715	444,252
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	19,921	10,105
Total, Fair Value	5,172,412	4,480,405
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	44,122	60,942
US Treasury and Government [Member]
Investment [Line Items]
Less than 12 months, Fair Value	618,617	349,538
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	4,443	2,823
12 months or longer, Fair Value	0	32,208
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0	3,489
Total, Fair Value	618,617	381,746
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	4,443	6,312
US Government-sponsored Enterprise Debt Securities [Member]
Investment [Line Items]
Less than 12 months, Fair Value	286,393	190,441
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	1,712	1,576
12 months or longer, Fair Value	49,766	0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	217	0
Total, Fair Value	336,159	190,441
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	1,929	1,576
State and municipal obligations [Member]
Investment [Line Items]
Less than 12 months, Fair Value	282,843	700,779
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	1,752	12,164
12 months or longer, Fair Value	49,339	15,195
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	1,002	529
Total, Fair Value	332,182	715,974
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	2,754	12,693
Agency mortgage-backed securities [Member]
Investment [Line Items]
Less than 12 months, Fair Value	1,320,689	1,147,416
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	9,433	20,638
12 months or longer, Fair Value	619,300	2,150
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	14,311	5
Total, Fair Value	1,939,989	1,149,566
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	23,744	20,643
Non-agency mortgage-backed securities [Member]
Investment [Line Items]
Less than 12 months, Fair Value	577,017	688,131
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	2,966	6,373
12 months or longer, Fair Value	153,813	34,946
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	1,871	120
Total, Fair Value	730,830	723,077
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	4,837	6,493
Asset-backed Securities [Member]
Investment [Line Items]
Less than 12 months, Fair Value	786,048	780,209
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	3,168	5,277
12 months or longer, Fair Value	264,295	358,778
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	2,069	5,936
Total, Fair Value	1,050,343	1,138,987
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	5,237	11,213
Total mortgage and asset-backed securities [Member]
Investment [Line Items]
Less than 12 months, Fair Value	2,683,754	2,615,756
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	15,567	32,288
12 months or longer, Fair Value	1,037,408	395,874
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	18,251	6,061
Total, Fair Value	3,721,162	3,011,630
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	33,818	38,349
Other debt securities [Member]
Investment [Line Items]
Less than 12 months, Fair Value	144,090	179,639
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	727	1,986
12 months or longer, Fair Value	20,202	975
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	451	26
Total, Fair Value	164,292	180,614
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	$ 1,178	$ 2,012

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Investment Securities Investment Securities (Credit Ratings In State And Municipal Bond Portfolio) (Details)	Dec. 31, 2017 Rate
Schedule of Available-for-sale Securities [Line Items]
Percentage of State and Municipal Bond Portfolio, by credit rating	100.00%
Moody's, Aaa Rating [Member]
Schedule of Available-for-sale Securities [Line Items]
Percentage of State and Municipal Bond Portfolio, by credit rating	6.00%
Moody's Aa Rating [Member]
Schedule of Available-for-sale Securities [Line Items]
Percentage of State and Municipal Bond Portfolio, by credit rating	76.90%
Moody's A Rating [Member]
Schedule of Available-for-sale Securities [Line Items]
Percentage of State and Municipal Bond Portfolio, by credit rating	16.40%
Moody's Not Rated [Member]
Schedule of Available-for-sale Securities [Line Items]
Percentage of State and Municipal Bond Portfolio, by credit rating	0.70%

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Investment Securities (Proceeds From Sales Of Securities And Components Of Investment Securities Gains And Losses) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Investment [Line Items]
Proceeds from sales of available for sale securities	$ 790,152	$ 2,049	$ 675,870
Proceeds from sales of non-marketable securities	2,228	22,331	13,161
Total proceeds	792,380	24,380	689,031
Investment securities gains (losses), net	25,051	(53)	6,320
Available-for-sale Securities [Member]
Investment [Line Items]
Gains realized on sales	10,656	109	2,925
Loss realized on sales	(10,297)	0	0
Loss Realized on Called Bond	(254)	0	0
Gain realized on donation	31,074	0	0
Other-than-temporary impairment recognized on debt securities	(385)	(270)	(483)
Non-Marketable [Member]
Investment [Line Items]
Gains realized on sales	970	4,349	2,516
Losses realized on sales	(880)	(502)	(40)
Fair value adjustments, net	$ (5,833)	$ (3,739)	$ 1,402

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Land, Buildings And Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Property, Plant and Equipment [Line Items]
Gross land, buildings and equipment	$ 852,072	$ 886,740
Less accumulated depreciation and amortization	516,962	549,035
Net land, buildings and equipment	335,110	337,705
Depreciation expense	29,100	30,100	$ 30,100
Repairs and maintenance expense	16,400	16,200	16,300
Interest Expense Capitalized on Construction Projects	0	0	$ 0
Land [Member]
Property, Plant and Equipment [Line Items]
Gross land, buildings and equipment	94,992	98,221
Building and improvements [Member]
Property, Plant and Equipment [Line Items]
Gross land, buildings and equipment	540,204	530,489
Equipment [Member]
Property, Plant and Equipment [Line Items]
Gross land, buildings and equipment	$ 216,876	$ 258,030

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Goodwill And Other Intangible Assets (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items]
Impairment of goodwill	$ 0	$ 0	$ 0
Aggregate amortization expense for intangible assets	1,300	1,500	$ 1,800
Goodwill [Member]
Finite-Lived Intangible Assets [Line Items]
Aggregate amortization expense for intangible assets	0	0
Core Deposits [Member]
Finite-Lived Intangible Assets [Line Items]
Aggregate amortization expense for intangible assets	876	1,190
Mortgage Servicing Rights [Member]
Finite-Lived Intangible Assets [Line Items]
Recognized temporary impairment	9
Aggregate amortization expense for intangible assets	$ 462	$ 316

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Goodwill And Other Intangible Assets (Schedule Of Intangible Assets With Estimable Useful Lives) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 39,176	$ 36,942
Accumulated Amortization	(31,549)	(30,211)
Valuation Allowance	(9)	(22)
Net Amount	7,618	6,709
Core Deposit Premium [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	31,270	31,270
Accumulated Amortization	(28,305)	(27,429)
Valuation Allowance	0	0
Net Amount	2,965	3,841
Mortgage Servicing Rights [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	7,906	5,672
Accumulated Amortization	(3,244)	(2,782)
Valuation Allowance	(9)	(22)
Net Amount	$ 4,653	$ 2,868

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Goodwill And Other Intangible Assets (Schedule Of Goodwill Allocated By Operating Segments) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Goodwill [Line Items]
Goodwill	$ 138,921	$ 138,921
Consumer Segment [Member]
Goodwill [Line Items]
Goodwill	70,721	70,721
Commercial Segment [Member]
Goodwill [Line Items]
Goodwill	67,454	67,454
Wealth Segment [Member]
Goodwill [Line Items]
Goodwill	$ 746	$ 746

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Goodwill And Other Intangible Assets (Schedule Of Changes In Carrying Amount Of Goodwill And Net Other Intangible Assets) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Goodwill [Roll Forward]
Amortization	$ (1,300)	$ (1,500)	$ (1,800)
Goodwill [Member]
Goodwill [Roll Forward]
Balance, beginning	138,921	138,921
Originations	0	0
Amortization	0	0
Impairment reversal	0	0
Balance, ending	138,921	138,921	138,921
Core Deposit Premium [Member]
Goodwill [Roll Forward]
Balance, beginning	3,841	5,031
Originations	0	0
Amortization	(876)	(1,190)
Impairment reversal	0	0
Balance, ending	2,965	3,841	5,031
Mortgage Servicing Rights [Member]
Goodwill [Roll Forward]
Balance, beginning	2,868	1,638
Originations	2,234	1,539
Amortization	(462)	(316)
Impairment reversal	13	7
Balance, ending	$ 4,653	$ 2,868	$ 1,638

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Goodwill And Other Intangible Assets (Schedule Of Estimated Annual Amortization Expense) (Details) $ in Thousands	Dec. 31, 2017 USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]
2018	$ 1,213
2019	1,038
2020	878
2021	753
2022	$ 653

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Deposits (Scheduled Maturities Of Total Time Open And Certificates Of Deposit) (Details) $ in Thousands	Dec. 31, 2017 USD ($)
Deposits [Abstract]
Due in 2018	$ 1,414,554
Due in 2019	217,562
Due in 2020	73,192
Due in 2021	41,313
Due in 2022	18,191
Thereafter	2,052
Total	$ 1,766,864

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Deposits (Maturities Of Time Open And Certificates Of Deposit Detailed Breakdown By Size Category) (Details) $ in Thousands	Dec. 31, 2017 USD ($)
Deposits [Abstract]
Certificates Of Deposit under $100,000, Due in 3 months or less	$ 115,126
Certificates Of Deposit under $100,000, Due in over 3 through 6 months	115,595
Certificates Of Deposit under $100,000, Due in over 6 through 12 months	180,447
Certificates Of Deposit under $100,000, Due in over 12 months	82,789
Certificates Of Deposit under $100,000	493,957
Other Time Deposits under $100,000, Due in 3 months or less	24,019
Other Time Deposits under $100,000, Due in over 3 through 6 months	26,607
Other Time Deposits under $100,000, Due in over 6 through 12 months	36,573
Other Time Deposits under $100,000, Due in over 12 months	53,490
Other Time Deposits under $100,000	140,689
Certificates Of Deposit over $100,000, Due in 3 months or less	484,168
Certificates Of Deposit over $100,000, Due in over 3 through 6 months	197,173
Certificates Of Deposit over $100,000, Due in over 6 through 12 months	216,459
Certificates Of Deposit over $100,000, Due in over 12 months	205,085
Certificates Of Deposit over $100,000	1,102,885
Other Time Deposits over $100,000, Due in 3 months or less	3,744
Other Time Deposits over $100,000, Due in over 3 through 6 months	5,438
Other Time Deposits over $100,000, Due in over 6 through 12 months	9,205
Other Time Deposits other $100,000, Due in over 12 months	10,946
Other Time Deposits over $100,000	29,333
Due in 3 months or less, Total	627,057
Due in over 3 through 6 months, Total	344,813
Due in over 6 through 12 months, Total	442,684
Due in over 12 months, Total	352,310
Total	1,766,864
Aggregate amount of time open and certificates of deposit that exceed the $250,000 FDIC insurance limit	$ 880,900

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Borrowings (Narrative) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2017 USD ($)
Debt Disclosure [Abstract]
FHLB borrowings repaid	$ 100.0
FHLB issued letters of credit	498.4
Long-term Debt and Capital Lease Obligations	$ 1.8

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Borrowings (Short-Term Borrowings) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Short-term Debt [Line Items]
Short-term repurchase agreement comprised of non-insured customer funds	$ 1,300,000
Federal Funds Purchased And Repurchase Agreements [Member]
Short-term Debt [Line Items]
Year End Weighted Rate	0.80%	0.40%	0.20%
Average Weighted Rate	0.70%	0.30%	0.10%
Average Balance Outstanding	$ 1,462,387	$ 1,266,093	$ 1,654,860
Maximum Outstanding at any Month End	1,984,071	1,723,905	2,193,197
Balance at December 31	$ 1,507,138	$ 1,723,905	$ 1,963,552

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Income Taxes (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Enacted Tax Rate Used to Revalue Deferred Tax Assets and Liabilities	21.00%
Effective income tax rate reconciliation, at federal statutory income tax rate	35.00%	35.00%	35.00%
Unrecognized Tax Benefits	$ 1,208	$ 1,228	$ 1,278
Unrecognized tax benefits impact the effective tax rate	$ 785	$ 798

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Income Taxes (Schedule Of Components Of Income Tax Expense (Benefit)) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
U.S. federal, Current	$ 89,154	$ 116,753	$ 102,607
State and local, Current	7,735	9,457	6,551
Current, income tax expense (benefit)	96,889	126,210	109,158
U.S. federal, Deferred	12,190	(2,036)	7,084
State and local, Deferred	1,427	(23)	348
Deferred, income tax expense (benefit)	13,617	(2,059)	7,432
U.S. federal, Total	101,344	114,717	109,691
State and local, Total	9,162	9,434	6,899
Total income tax expense	$ 110,506	$ 124,151	$ 116,590

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Income Taxes (Components Of Income Tax Expense Recorded Directly To Stockholders Equity) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Unrealized gain (loss) on securities available for sale	$ 2,104	$ (13,952)	$ (19,634)
Compensation expense for tax purposes in excess of amounts recognized for financial reporting purposes	(184)	778	1,478
Accumulated pension (benefit) loss	0	(3,390)	(2,132)
Income tax expense (benefit) allocated to stockholders’ equity	$ 1,920	$ (16,564)	$ (20,288)

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Income Taxes (Components Of Deferred Tax Assets And Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Loans, principally due to allowance for loan losses	$ 40,341	$ 61,233
Equity-based compensation	8,201	12,633
Deferred compensation	5,647	7,998
Private equity investments	5,473	9,667
Accrued expenses	5,245	16,638
Unearned fee income	3,701	3,819
Deferred tax assets, Other	4,430	6,071
Total deferred tax assets	73,038	118,059
Equipment lease financing	45,825	71,355
Unrealized gain on securities available for sale	13,603	18,572
Land, buildings and equipment	8,592	10,375
Undistributed earnings of subsidiaries	7,094	23
Intangibles	5,732	9,105
Deferred tax liabilities, Other	6,569	8,765
Total deferred tax liabilities	87,415	118,195
Net deferred tax assets (liabilities)	$ (14,377)	$ (136)

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Income Taxes (Schedule Of Company's Actual Income Tax Expense) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Computed “expected” tax expense	$ 150,461	$ 139,840	$ 133,112
Tax-exempt interest, net of cost to carry	(20,295)	(20,033)	(19,083)
Effective Income Tax Rate Reconciliation, Contribution of Appreciated Securities, Amount	(10,864)	0	0
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount	(6,753)	0	0
Effective Income Tax Rate Reconciliation, Share-based Award Payments, Amount	(6,613)	0	0
State and local income taxes, net of federal tax benefit	5,955	6,132	4,484
Tax deductible dividends on allocated shares held by the Company’s ESOP	(966)	(1,044)	(1,093)
Other	(419)	(744)	(830)
Total income tax expense	$ 110,506	$ 124,151	$ 116,590

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Income Taxes (Schedule Of Accrued Liability For Unrecognized Tax Benefit) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Reconciliation of Unrecognized Tax Benefits [Roll Forward]
Unrecognized tax benefits at beginning of year	$ 1,228	$ 1,278
Gross increases – tax positions in prior period	5	0
Gross decreases – tax positions in prior period	0	(1)
Gross increases – current-period tax positions	268	269
Lapse of statute of limitations	(293)	(318)
Unrecognized tax benefits at end of year	$ 1,208	$ 1,228

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Employee Benefit Plans (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined benefit plan, discretionary contribution by employer	$ 5,500,000	$ 0
Minimum required contribution for 2017	0
Contributions to the CERP	439,000	21,000	$ 20,000
Accumulated benefit obligation	120,700,000	116,700,000
Defined Benefit Plan, Amount to be Amortized from Accumulated Other Comprehensive Income (Loss) Next Fiscal Year	2,100,000
Interest cost on projected benefit obligation	$ 3,826,000	$ 3,944,000	$ 4,762,000
Expected long-term rate of return on pension plan assets	6.00%	6.00%	6.00%
Annualized 10-year return for pension plan	6.30%
Rate of return	9.60%	7.20%
Pension expense	$ 704,000
Expected pension expense for the upcoming fiscal year	$ 761,000
Equity securities [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Long-term investment target mix	35.00%
Fixed Income Securities [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Long-term investment target mix	65.00%
Change due to updated mortality projection scale [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Change in pension plan obligations due to change in mortality assumptions	$ (300,000)
Change in Accounting Estimate, Type [Domain]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Interest cost on projected benefit obligation		$ (900,000)

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Employee Benefit Plans (Employee Benefits Charged To Operating Expenses) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Total employee benefits	$ 67,376	$ 66,470	$ 60,180
Payroll Taxes [Member]
Total employee benefits	24,402	23,210	22,235
Medical Plans [Member]
Total employee benefits	25,143	25,497	20,659
401K Plan [Member]
Total employee benefits	14,244	13,562	12,841
Pension Plans [Member]
Total employee benefits	704	987	1,495
Other [Member]
Total employee benefits	$ 2,883	$ 3,214	$ 2,950

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Employee Benefit Plans (Components Of The Net Pension Cost) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract]
Service cost-benefits earned during the year	$ 621	$ 500	$ 503
Interest cost on projected benefit obligation	3,826	3,944	4,762
Expected return on plan assets	(5,785)	(5,751)	(6,092)
Amortization of Prior Service Cost (Credit)	(271)	(271)	(271)
Amortization of unrecognized net loss	2,313	2,565	2,593
Net periodic pension cost	$ 704	$ 987	$ 1,495

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Employee Benefit Plans (Summary Of Pension Plans Funded Status) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Projected benefit obligation at prior valuation date	$ 116,695	$ 117,562
Service cost	621	500	$ 503
Interest cost	3,826	3,944	4,762
Benefits paid	(6,780)	(6,322)
Actuarial (gain) loss	6,305	1,011
Projected benefit obligation at valuation date	120,667	116,695	117,562
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at prior valuation date	99,537	99,325
Actual return on plan assets	9,564	6,513
Employer contributions	5,939	21
Benefits paid	(6,780)	(6,322)
Fair value of plan assets at valuation date	108,260	99,537	$ 99,325
Funded status and net amount recognized at valuation date	$ (12,407)	$ (17,158)

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Employee Benefit Plans (Schedule Of Amounts Not Yet Reflected In Net Periodic Benefit Cost And Included In Accumulated Other Comprehensive Income (Loss), Pre-Tax Basis) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract]
Prior service credit (cost)	$ 1,806	$ 2,077
Accumulated loss	(33,499)	(33,285)
Accumulated other comprehensive loss	(31,693)	(31,208)
Cumulative employer contributions in excess of net periodic benefit cost	19,286	14,050
Net amount recognized as an accrued benefit liability on the December 31 balance sheet	(12,407)	(17,158)
Net loss arising during period	(2,527)	(248)
Amortization or settlement recognition of net loss	2,313	2,565
Amortization of Prior Service Cost (Credit)	(271)	(271)	$ (271)
Total recognized in other comprehensive income	(485)	2,046
Total expense recognized in net periodic pension cost and other comprehensive income	$ (1,189)	$ 1,059

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Employee Benefit Plans (Assumptions On A Weighted Average Basis, Used In Accounting For Plans) (Details)	12 Months Ended
	Dec. 31, 2017 Rate	Dec. 31, 2016 Rate	Dec. 31, 2015 Rate
Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract]
Determination of benefit obligation at year end, Discount rate	3.57%	4.05%	4.15%
Determination of benefit obligation at year end, Assumed credit on cash balance accounts	5.00%	5.00%	5.00%
Determination of net periodic benefit cost for year ended, Discount rate	3.95%	4.16%	3.95%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Effective Rate of Interest	3.28%	3.38%
Determination of net periodic benefit cost for year ended, Long-term rate of return on assets	6.00%	6.00%	6.00%
Determination of net periodic benefit cost for year ended, Assumed credit on cash balance accounts	5.00%	5.00%	5.00%

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Employee Benefit Plans (Fair Value Of Pension Plan Assets By Asset Category) (Details) - USD ($) $ in Thousands		Dec. 31, 2017	Dec. 31, 2016
U.S. government obligations		$ 917,147	$ 920,904
Government-sponsored enterprise obligations		406,363	449,998
State and municipal obligations		1,611,366	1,778,214
Agency mortgage-backed securities		3,040,913	2,685,931
Non-agency mortgage-backed securities		905,793	1,055,639
Asset-backed securities		1,492,800	2,381,301
Pension Plans [Member]
U.S. government obligations		3,719	3,621
Government-sponsored enterprise obligations	[1]	1,282	1,215
State and municipal obligations		8,527	9,148
Agency mortgage-backed securities	[2]	7,896	4,073
Non-agency mortgage-backed securities		4,891	5,437
Asset-backed securities		3,833	5,275
Corporate bonds	[3]	37,457	34,037
Mutual funds	[4]	6,979	10,393
Common stocks	[4]	23,744	20,141
International developed markets	[4]	7,870	5,100
Emerging markets	[4]	2,062	1,097
Total		108,260	99,537
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
U.S. government obligations		917,147	920,904
Government-sponsored enterprise obligations		0	0
State and municipal obligations		0	0
Agency mortgage-backed securities		0	0
Non-agency mortgage-backed securities		0	0
Asset-backed securities		0	0
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | Pension Plans [Member]
U.S. government obligations		3,719	3,621
Government-sponsored enterprise obligations	[1]	0	0
State and municipal obligations		0	0
Agency mortgage-backed securities	[2]	0	0
Non-agency mortgage-backed securities		0	0
Asset-backed securities		0	0
Corporate bonds	[3]	0	0
Mutual funds	[4]	6,979	10,393
Common stocks	[4]	23,744	20,141
International developed markets	[4]	7,870	5,100
Emerging markets	[4]	2,062	1,097
Total		44,374	40,352
Significant Other Observable Inputs (Level 2) [Member]
U.S. government obligations		0	0
Government-sponsored enterprise obligations		406,363	449,998
State and municipal obligations		1,594,350	1,761,532
Agency mortgage-backed securities		3,040,913	2,685,931
Non-agency mortgage-backed securities		905,793	1,055,639
Asset-backed securities		1,492,800	2,381,301
Significant Other Observable Inputs (Level 2) [Member] | Pension Plans [Member]
U.S. government obligations		0	0
Government-sponsored enterprise obligations	[1]	1,282	1,215
State and municipal obligations		8,527	9,148
Agency mortgage-backed securities	[2]	7,896	4,073
Non-agency mortgage-backed securities		4,891	5,437
Asset-backed securities		3,833	5,275
Corporate bonds	[3]	37,457	34,037
Mutual funds	[4]	0	0
Common stocks	[4]	0	0
International developed markets	[4]	0	0
Emerging markets	[4]	0	0
Total		63,886	59,185
Significant Unobservable Inputs (Level 3) [Member]
U.S. government obligations		0	0
Government-sponsored enterprise obligations		0	0
State and municipal obligations		17,016	16,682
Agency mortgage-backed securities		0	0
Non-agency mortgage-backed securities		0	0
Asset-backed securities		0	0
Significant Unobservable Inputs (Level 3) [Member] | Pension Plans [Member]
U.S. government obligations		0	0
Government-sponsored enterprise obligations	[1]	0	0
State and municipal obligations		0	0
Agency mortgage-backed securities	[2]	0	0
Non-agency mortgage-backed securities		0	0
Asset-backed securities		0	0
Corporate bonds	[3]	0	0
Mutual funds	[4]	0	0
Common stocks	[4]	0	0
International developed markets	[4]	0	0
Emerging markets	[4]	0	0
Total		$ 0	$ 0

[1] This category represents bonds (excluding mortgage-backed securities) issued by agencies such as the Federal Home Loan Bank, the Federal Home Loan Mortgage Corp and the Federal National Mortgage Association.

[2] This category represents mortgage-backed securities issued by the agencies mentioned in (a).

[3] This category represents investment grade bonds issued in the U.S., primarily by domestic issuers, representing diverse industries.

[4] This category represents investments in individual common stocks and equity funds. These holdings are diversified, largely across the financial services, consumer goods, healthcare, electronic technology and technology services industries.

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Employee Benefit Plans (Future Benefit Payments) (Details) $ in Thousands	Dec. 31, 2017 USD ($)
Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract]
2018	$ 7,133
2019	7,231
2020	7,413
2021	7,534
2022	7,473
2023 - 2027	$ 37,421

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Stock-Based Compensation and Directors Stock Purchase Plan (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Jan. 01, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Remaining number of shares available for issuance under the plan	2,776,076
Stock-based compensation	$ 12.1	$ 11.5	$ 10.1
Total tax benefit recognized from compensation arrangements	4.5	4.3	3.8
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets				$ 1.3
Fair value of shares vested during the period	23.8	$ 10.9	$ 6.0
Unrecognized compensation cost related to unvested options, SAR's and stock awards	$ 24.0
Compensation cost is expected to be recognized over a weighted average period, years	3 years
Common stock dividend rate percentage	5.00%
Nonvested Stock Award [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock awards vesting period (in years)	4 years
Nonvested Stock Award [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock awards vesting period (in years)	7 years
Stock Appreciation Rights (SARs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock awards vesting period (in years)	4 years
Contractual terms of awards granted (in years)	10 years
Directors Stock Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Remaining number of shares available for issuance under the plan	80,377
Number of shares purchased under stock option plan	15,873	21,568
Average price of shares purchased under stock option plan	$ 54.55	$ 42.50

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Stock-Based Compensation and Directors Stock Purchase Plan (Summary Of The Status Of Nonvested Share Awards) (Details)	12 Months Ended
	Dec. 31, 2017 $ / shares shares
Nonvested Share Awards [Roll Forward]
Nonvested, share awards, beginning balance | shares	1,461,713
Granted, Shares | shares	263,123
Vested, Shares | shares	(442,435)
Forfeited, Shares | shares	(27,883)
Canceled, Shares | shares	0
Nonvested, share awards, ending balance | shares	1,254,518
Nonvested Weighted Average Grant Date Fair Value [Roll Forward]
Nonvested, Weighted Average Grant Date Fair Value, Beginning Balance | $ / shares	$ 33.02
Granted, Weighted Average Grant Date Fair Value | $ / shares	54.56
Vested, Weighted Average Grant Date Fair Value | $ / shares	29.41
Forfeited, Weighted Average Grant Date Fair Value | $ / shares	39.12
Canceled, Weighted Average Grant Date Fair Value | $ / shares	0.00
Nonvested , Weighted Average Grant Date Fair Value, Ending Balance | $ / shares	$ 38.67

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Stock-Based Compensation and Directors Stock Purchase Plan (Summary Of SAR Activity) (Details) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2017 USD ($) $ / shares shares
Stock Appreciation Rights, Shares [Roll Forward]
Outstanding, Shares, Beginning Balance | shares	1,390,782
Granted, Shares | shares	173,740
Forfeited, Shares | shares	(13,325)
Expired, Shares | shares	(878)
Exercised, Shares | shares	(371,033)
Outstanding, Shares, Ending Balance | shares	1,179,286
Exercisable, Shares, Ending Balance | shares	630,135
Stock Appreciation Rights, Weighted Average Exercise Price [Roll Forward]
Outstanding, Weighted Average Exercise Price, Beginning Balance | $ / shares	$ 32.89
Granted, Weighted Average Exercise Price | $ / shares	54.79
Forfeited, Weighted Average Exercise Price | $ / shares	42.19
Expired, Weighted Average Exercise Price | $ / shares	34.75
Exercised, Weighted Average Exercise Price | $ / shares	29.30
Outstanding, Weighted Average Exercise Price, Ending Balance | $ / shares	37.13
Exercisable, Weighted Average Exercise Price, Ending Balance | $ / shares	$ 32.60
Outstanding, Weighted Average Remaining Contractual Term (in years)	6 years 2 months
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Outstanding | $	$ 22,073
Exercisable, Weighted Average Remaining Contractual Term (in years)	4 years 7 months
Exercisable, Aggregate Intrinsic Value, Ending Balance | $	$ 14,645

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Stock-Based Compensation and Directors Stock Purchase Plan Share Based Compensation Valuation Assumptions [Table] (Details) - $ / shares	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Schedule Of Share Based Payment Award Stock Options Valuation Assumptions [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value	$ 11.94	$ 6.79	$ 6.55
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate	1.60%	2.20%	2.20%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate	21.10%	21.20%	21.30%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate	2.40%	1.80%	1.80%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term	7 years	7 years 2 months	7 years 2 months

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Stock-Based Compensation and Directors Stock Purchase Plan Stock-Based Compensation and Directors Stock Purchase Plan (Additional Information About Stock Options and SARs Exercises) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Share-based Compensation [Abstract]
Intrinsic value of options and SARs exercised	$ 9,310	$ 8,854	$ 7,541
Cash received from options and SARs exercised	0	0	1,914
Tax benefit realized from options and SARs exercised	$ 2,698	$ 1,781	$ 1,041

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Accumulated Other Comprehensive Income (Schedule Of Accumulated Other Comprehensive Income) (Details) - USD ($)		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income		$ 14,108,000	$ 10,975,000	$ 32,470,000
Other Comprehensive Income (Loss), before Reclassifications, before Tax		34,059,000	(37,125,000)
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax		(29,006,000)	2,456,000
Other Comprehensive Income (Loss), before Tax		5,053,000	(34,669,000)
Other Comprehensive Income (Loss), Tax		(1,920,000)	13,174,000
Other comprehensive income (loss)		3,133,000	(21,495,000)	(29,623,000)
Reclassification Where Impairment Was Not Previously Recognized		0
Pension Loss [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income	[1]	(19,629,000)	(19,328,000)	(20,596,000)
Other Comprehensive Income (Loss), before Reclassifications, before Tax	[1]	(2,527,000)	(248,000)
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	[1]	2,042,000	2,294,000
Other Comprehensive Income (Loss), before Tax	[1]	(485,000)	2,046,000
Other Comprehensive Income (Loss), Tax	[1]	184,000	(778,000)
Other comprehensive income (loss)	[1]	(301,000)	1,268,000
Reclassification Where Impairment Was Not Previously Recognized	[1]	0	0
Unrealized Gain Loss on Securities Other [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income	[2]	30,326,000	27,328,000	49,750,000
Other Comprehensive Income (Loss), before Reclassifications, before Tax	[2]	36,307,000	(36,057,000)
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	[2]	(31,433,000)	(108,000)
Other Comprehensive Income (Loss), before Tax	[2]	4,874,000	(36,165,000)
Other Comprehensive Income (Loss), Tax	[2]	(1,852,000)	13,743,000
Other comprehensive income (loss)	[2]	3,022,000	(22,422,000)
Reclassification Where Impairment Was Not Previously Recognized	[2]	(24,000)	0
Unrealized Gain Loss on Securities OTTI [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income	[2]	3,411,000	2,975,000	$ 3,316,000
Other Comprehensive Income (Loss), before Reclassifications, before Tax	[2]	279,000	(820,000)
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	[2]	385,000	270,000
Other Comprehensive Income (Loss), before Tax	[2]	664,000	(550,000)
Other Comprehensive Income (Loss), Tax	[2]	(252,000)	209,000
Other comprehensive income (loss)	[2]	412,000	(341,000)
Reclassification Where Impairment Was Not Previously Recognized	[2]	$ 24,000	$ 0

[1] The pre-tax amounts reclassified from accumulated other comprehensive income are included in the computation of net periodic pension cost as "amortization of prior service cost" and "amortization of unrecognized net loss" (see Note 9), for inclusion in the consolidated statements of income.

[2] The pre-tax amounts reclassified from accumulated other comprehensive income are included in "investment securities gains (losses), net" in the consolidated statements of income.

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Segments (Schedule Of Financial Information By Segment) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2017 USD ($) Operating_Segments	Dec. 31, 2016 USD ($) Operating_Segments	Dec. 31, 2015 USD ($)
Segment Reporting Information [Line Items]
Number of operating segments | Operating_Segments	3	3
Net interest income	$ 733,679	$ 680,049	$ 634,320
Provision for loan losses	(45,244)	(36,318)	(28,727)
Non-interest income	486,604	474,392	448,139
Investment securities gains (losses), net	25,051	(53)	6,320
Non-interest expense	(769,684)	(717,065)	(676,487)
Income before income taxes	430,406	401,005	383,565
Consumer Segment [Member]
Segment Reporting Information [Line Items]
Net interest income	279,031	268,654	266,328
Provision for loan losses	(41,829)	(36,042)	(34,864)
Non-interest income	136,554	131,988	119,561
Investment securities gains (losses), net	0	0	0
Non-interest expense	(290,905)	(282,061)	(273,378)
Income before income taxes	82,851	82,539	77,647
Commercial Segment [Member]
Segment Reporting Information [Line Items]
Net interest income	328,345	311,704	296,510
Provision for loan losses	205	4,378	1,032
Non-interest income	194,581	199,384	194,133
Investment securities gains (losses), net	0	0	0
Non-interest expense	(290,874)	(284,432)	(267,343)
Income before income taxes	232,257	231,034	224,332
Wealth Segment [Member]
Segment Reporting Information [Line Items]
Net interest income	47,264	44,113	42,653
Provision for loan losses	(41)	(122)	75
Non-interest income	158,175	144,661	136,374
Investment securities gains (losses), net	0	0	0
Non-interest expense	(120,458)	(113,888)	(108,755)
Income before income taxes	84,940	74,764	70,347
Segment Totals [Member]
Segment Reporting Information [Line Items]
Net interest income	654,640	624,471	605,491
Provision for loan losses	(41,665)	(31,786)	(33,757)
Non-interest income	489,310	476,033	450,068
Investment securities gains (losses), net	0	0	0
Non-interest expense	(702,237)	(680,381)	(649,476)
Income before income taxes	400,048	388,337	372,326
Other/Elimination [Member]
Segment Reporting Information [Line Items]
Net interest income	79,039	55,578	28,829
Provision for loan losses	(3,579)	(4,532)	5,030
Non-interest income	(2,706)	(1,641)	(1,929)
Investment securities gains (losses), net	25,051	(53)	6,320
Non-interest expense	(67,447)	(36,684)	(27,011)
Income before income taxes	$ 30,358	$ 12,668	$ 11,239

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Segments Segments (Segment Balance Sheet Data) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Average Assets	$ 25,031,608	$ 24,556,471
Average Loans, including held for sale	13,629,151	12,953,488
Average Goodwill and other intangible assets	146,018	145,565
Average Deposits	20,594,786	20,330,913
Consumer Segment [Member]
Segment Reporting Information [Line Items]
Average Assets	2,610,045	2,673,915
Average Loans, including held for sale	2,471,578	2,533,528
Average Goodwill and other intangible assets	76,734	75,971
Average Deposits	10,190,613	9,956,327
Commercial Segment [Member]
Segment Reporting Information [Line Items]
Average Assets	8,830,584	8,267,963
Average Loans, including held for sale	8,635,035	8,072,528
Average Goodwill and other intangible assets	68,538	68,848
Average Deposits	8,301,004	8,243,394
Wealth Segment [Member]
Segment Reporting Information [Line Items]
Average Assets	1,218,598	1,116,969
Average Loans, including held for sale	1,209,792	1,108,211
Average Goodwill and other intangible assets	746	746
Average Deposits	2,090,582	2,084,940
Segment Totals [Member]
Segment Reporting Information [Line Items]
Average Assets	12,659,227	12,058,847
Average Loans, including held for sale	12,316,405	11,714,267
Average Goodwill and other intangible assets	146,018	145,565
Average Deposits	20,582,199	20,284,661
Other/Elimination [Member]
Segment Reporting Information [Line Items]
Average Assets	12,372,381	12,497,624
Average Loans, including held for sale	1,312,746	1,239,221
Average Goodwill and other intangible assets	0	0
Average Deposits	$ 12,587	$ 46,252

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Common and Preferred Stock (Narrative) (Details) - $ / shares	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract]
Common stock, shares authorized	120,000,000	120,000,000
Common stock dividend rate percentage	5.00%
Common stock, par value	$ 5.00	$ 5.00
Antidilutive Securities Excluded from Computation of Earnings Per Share (in shares)	152,000	99,000	443,000
Shares available for purchase under the current Board authorization			5,000,000
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased	3,443,523

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Common and Preferred Stock (Summary Of Components Used To Calculate Basic And Diluted Income Per Share) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net income attributable to Commerce Bancshares, Inc.	$ 319,383	$ 275,391	$ 263,730
Preferred Stock Dividends, Income Statement Impact	9,000	9,000	9,000
Net Income (Loss) Available to Common Stockholders, Basic	$ 310,383	$ 266,391	$ 254,730
Basic income per common share (in dollars per share)	$ 2.90	$ 2.50	$ 2.33
Diluted income per common share (in dollars per share)	$ 2.89	$ 2.49	$ 2.32
Basic Income Per Common Share [Member]
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net income attributable to Commerce Bancshares, Inc.	$ 319,383	$ 275,391	$ 263,730
Preferred Stock Dividends, Income Statement Impact	9,000	9,000	9,000
Net Income (Loss) Available to Common Stockholders, Basic	310,383	266,391	254,730
Less income allocated to nonvested restricted stockholders	3,848	3,698	3,548
Net income available to common stockholders	$ 306,535	$ 262,693	$ 251,182
Weighted average common shares outstanding	105,555	105,243	108,016
Basic income per common share (in dollars per share)	$ 2.90	$ 2.50	$ 2.33
Diluted Income Per Common Share [Member]
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net Income (Loss) Available to Common Stockholders, Diluted	$ 310,383	$ 266,391	$ 254,730
Less income allocated to nonvested restricted stockholders	3,838	3,692	3,541
Net income available to common stockholders	$ 306,545	$ 262,699	$ 251,189
Weighted average common shares outstanding	105,555	105,243	108,016
Net effect of the assumed exercise of stock-based awards -- based on the treasury stock method using the average market price for the respective periods	372	281	336
Weighted average diluted common shares outstanding	105,927	105,524	108,352
Diluted income per common share (in dollars per share)	$ 2.89	$ 2.49	$ 2.32

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Common and Preferred Stock Common and Preferred Stock (Schedule of Activity in the Outstanding Shares of the Company's Common Stock) (Details) - Common Stock [Member] - shares shares in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Increase (Decrease) in Common Stock [Roll Forward]
Shares outstanding, beginning balance	101,461	97,226	96,327
Awards and sales under employee and director plans	403	397	435
5% stock dividend	5,078	4,831	4,641
Purchases of treasury stock under accelerated share buyback programs	0	0	(3,635)
Other purchases of treasury stock	(315)	(959)	(535)
Other	(12)	(34)	(7)
Shares outstanding, ending balance	106,615	101,461	97,226

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Common and Preferred Stock Preferred Stock Issuance (Details) - USD ($) $ / shares in Units, $ in Millions	Dec. 31, 2017	Dec. 31, 2016	Jun. 19, 2014
Preferred Stock Issuance [Abstract]
Depositary shares issued	6,000,000
Preferred stock, shares issued	6,000	6,000	6,000
Preferred stock, par value	$ 1.00	$ 1.00	$ 1.00
Preferred Stock, Liquidation Preference, Value	$ 150.0
Preferred Stock, Liquidation Preference Per Share	$ 25

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Common and Preferred Stock Accelerated Share Repurchase (Details) - USD ($) shares in Millions, $ in Millions			12 Months Ended
	May 21, 2015	Jun. 20, 2014	Dec. 31, 2015
Accelerated Share Repurchase [Abstract]
Accelerated Share Repurchase Program Repurchase Amount	$ 100.0	$ 200.0
Shares received under accelerated share repurchase program			7.9

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Regulatory Capital Requirements (Schedule Of Capital Amounts And Ratios On Consolidated Basis) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Total Capital (to risk-weighted assets), Well-Capitalized Capital Requirement Ratio	10.00%
Tier I Capital (to risk-weighted assets), Well-Capitalized Capital Requirement Ratio	8.00%
Tier I Common Capital (to risk-weighted assets), Well-Capitalized Capital Requirement Ratio	6.50%
Tier I Capital (to adjusted quarterly average assets) (Leverage Ratio), Well-Capitalized Capital Requirement Ratio	5.00%
Commerce Bancshares, Inc. (Consolidated) [Member]
Total Capital (to risk-weighted assets), Actual Amount	$ 2,747,863	$ 2,529,675
Total Capital (to risk-weighted assets), Actual Ratio	14.35%	13.32%
Total Capital (to risk-weighted assets), Minimum Capital Requirement Amount	$ 1,531,996	$ 1,519,578
Total Capital (to risk-weighted assets), Minimum Capital Requirement Ratio	8.00%	8.00%
Tier I Capital (to risk-weighted assets), Actual Amount	$ 2,567,264	$ 2,352,154
Tier I Capital (to risk-weighted assets), Actual Ratio	13.41%	12.38%
Tier I Capital (to risk-weighted assets), Minimum Capital Requirement Amount	$ 1,148,997	$ 1,139,684
Tier I Capital (to risk-weighted assets), Minimum Capital Requirement Ratio	6.00%	6.00%
Tier I Common Capital (to risk-weighted assets), Actual Amount	$ 2,422,480	$ 2,207,370
Tier I Common Capital (to rIsk-weighted assets), Actual Rato	12.65%	11.62%
Tier I Common Capital (to risk-weighted assets), Minimum Capital Requirement Amount	$ 861,748	$ 854,763
Tier I Common Capital (to risk-weighted assets), Minimum Capital Requirement Ratio	4.50%	4.50%
Tier I Capital (to adjusted quarterly average assets) (Leverage Ratio), Actual Amount	$ 2,567,264	$ 2,352,154
Tier I Capital (to adjusted quarterly average assets) (Leverage Ratio), Actual Ratio	10.39%	9.55%
Tier I Capital (to adjusted quarterly average assets) (Leverage Ratio), Minimum Capital Requirement Amount	$ 988,653	$ 985,698
Tier I Capital (to adjusted quarterly average assets) (Leverage Ratio), Minimum Capital Requirement Ratio	4.00%	4.00%
Commerce Bank [Member]
Total Capital (to risk-weighted assets), Actual Amount	$ 2,428,789	$ 2,268,845
Total Capital (to risk-weighted assets), Actual Ratio	12.76%	12.00%
Total Capital (to risk-weighted assets), Minimum Capital Requirement Amount	$ 1,522,361	$ 1,512,471
Total Capital (to risk-weighted assets), Minimum Capital Requirement Ratio	8.00%	8.00%
Total Capital (to risk-weighted assets), Well-Capitalized Capital Requirement Amount	$ 1,902,951	$ 1,890,589
Total Capital (to risk-weighted assets), Well-Capitalized Capital Requirement Ratio	10.00%	10.00%
Tier I Capital (to risk-weighted assets), Actual Amount	$ 2,268,131	$ 2,111,797
Tier I Capital (to risk-weighted assets), Actual Ratio	11.92%	11.17%
Tier I Capital (to risk-weighted assets), Minimum Capital Requirement Amount	$ 1,141,771	$ 1,134,353
Tier I Capital (to risk-weighted assets), Minimum Capital Requirement Ratio	6.00%	6.00%
Tier I Capital (to risk-weighted assets), Well-Capitalized Capital Requirement Amount	$ 1,522,361	$ 1,512,471
Tier I Capital (to risk-weighted assets), Well-Capitalized Capital Requirement Ratio	8.00%	8.00%
Tier I Common Capital (to risk-weighted assets), Actual Amount	$ 2,268,131	$ 2,111,797
Tier I Common Capital (to rIsk-weighted assets), Actual Rato	11.92%	11.17%
Tier I Common Capital (to risk-weighted assets), Minimum Capital Requirement Amount	$ 856,328	$ 850,765
Tier I Common Capital (to risk-weighted assets), Minimum Capital Requirement Ratio	4.50%	4.50%
Tier I Common Capital (to risk-weighted assets), Well-Capitalized Capital Requirement Amount	$ 1,236,918	$ 1,228,883
Tier I Common Capital (to risk-weighted assets), Well-Capitalized Capital Requirement Ratio	6.50%	6.50%
Tier I Capital (to adjusted quarterly average assets) (Leverage Ratio), Actual Amount	$ 2,268,131	$ 2,111,797
Tier I Capital (to adjusted quarterly average assets) (Leverage Ratio), Actual Ratio	9.20%	8.59%
Tier I Capital (to adjusted quarterly average assets) (Leverage Ratio), Minimum Capital Requirement Amount	$ 986,240	$ 983,081
Tier I Capital (to adjusted quarterly average assets) (Leverage Ratio), Minimum Capital Requirement Ratio	4.00%	4.00%
Tier I Capital (to adjusted quarterly average assets) (Leverage Ratio), Well-Capitalized Capital Requirement Amount	$ 1,232,800	$ 1,228,851
Tier I Capital (to adjusted quarterly average assets) (Leverage Ratio), Well-Capitalized Capital Requirement Ratio	5.00%	5.00%

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Fair Value Measurements (Narrative) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Private equity investments, included in non-marketable securities	$ 55,752	$ 50,820
Fair Value Hierarchy, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Auction rate securities, available for sale	17,000
Private equity investments, included in non-marketable securities	$ 55,752	$ 50,820

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Fair Value Measurements (Summary Of Assets And Liabilities Measured At Fair Value On A Recurring Basis) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgages Held-for-sale, Fair Value Disclosure	$ 15,327	$ 9,263
U.S. government and federal agency obligations	917,147	920,904
Government-sponsored enterprise obligations	406,363	449,998
State and municipal obligations	1,611,366	1,778,214
Agency mortgage-backed securities	3,040,913	2,685,931
Non-agency mortgage-backed securities	905,793	1,055,639
Asset-backed securities	1,492,800	2,381,301
Other debt securities	351,060	325,953
Equity securities	48,838	51,263
Trading securities	18,269	22,225
Private equity investments	55,752	50,820
Derivative Assets	8,349	13,566
Deferred Compensation Plan Assets	12,843	10,261
Total assets	8,884,820	9,755,338
Derivative Liability	8,074	13,339
Deferred Compensation Liability, Current and Noncurrent	12,843	10,261
Total liabilities	20,917	23,600
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgages Held-for-sale, Fair Value Disclosure	0	0
U.S. government and federal agency obligations	917,147	920,904
Government-sponsored enterprise obligations	0	0
State and municipal obligations	0	0
Agency mortgage-backed securities	0	0
Non-agency mortgage-backed securities	0	0
Asset-backed securities	0	0
Other debt securities	0	0
Equity securities	19,864	24,967
Trading securities	0	0
Private equity investments	0	0
Derivative Assets	0	0
Deferred Compensation Plan Assets	12,843	10,261
Total assets	949,854	956,132
Derivative Liability	0	0
Deferred Compensation Liability, Current and Noncurrent	12,843	10,261
Total liabilities	12,843	10,261
Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgages Held-for-sale, Fair Value Disclosure	15,327	9,263
U.S. government and federal agency obligations	0	0
Government-sponsored enterprise obligations	406,363	449,998
State and municipal obligations	1,594,350	1,761,532
Agency mortgage-backed securities	3,040,913	2,685,931
Non-agency mortgage-backed securities	905,793	1,055,639
Asset-backed securities	1,492,800	2,381,301
Other debt securities	351,060	325,953
Equity securities	28,974	26,296
Trading securities	18,269	22,225
Private equity investments	0	0
Derivative Assets	7,723	13,146
Deferred Compensation Plan Assets	0	0
Total assets	7,861,572	8,731,284
Derivative Liability	7,951	13,177
Deferred Compensation Liability, Current and Noncurrent	0	0
Total liabilities	7,951	13,177
Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgages Held-for-sale, Fair Value Disclosure	0	0
U.S. government and federal agency obligations	0	0
Government-sponsored enterprise obligations	0	0
State and municipal obligations	17,016	16,682
Agency mortgage-backed securities	0	0
Non-agency mortgage-backed securities	0	0
Asset-backed securities	0	0
Other debt securities	0	0
Equity securities	0	0
Trading securities	0	0
Private equity investments	55,752	50,820
Derivative Assets	626	420
Deferred Compensation Plan Assets	0	0
Total assets	73,394	67,922
Derivative Liability	123	162
Deferred Compensation Liability, Current and Noncurrent	0	0
Total liabilities	$ 123	$ 162

XML

Fair Value Measurements (Summary of Changes in Level 3 Assets and Liabilities Measured at Fair Value on a Recurring Basis) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Beginning balance	$ 67,760	$ 80,296
Total gains or losses (realized/unrealized) included in earnings	(5,567)	(3,696)
Total gains losses (realized/unrealized) included in other comprehensive income	882	583
Investment securities called	(600)	(1,200)
Discount accretion	52	104
Purchases of private equity securities	13,352	9,906
Sale / paydown of private equity securities	(2,621)	(18,471)
Capitalized interest/dividends	34	92
Purchase of risk participation agreement	70	404
Sale of risk participation agreement	(91)	(258)
Ending balance	73,271	67,760
Total gains or losses for the annual period included in earnings attributable to the change in unrealized gains or losses relating to assets still held at period end	(5,043)	(5,608)
State and Municipal Obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Beginning balance	16,682	17,195
Total gains or losses (realized/unrealized) included in earnings	0	0
Total gains losses (realized/unrealized) included in other comprehensive income	882	583
Investment securities called	(600)	(1,200)
Discount accretion	52	104
Purchases of private equity securities	0	0
Sale / paydown of private equity securities	0	0
Capitalized interest/dividends	0	0
Purchase of risk participation agreement	0	0
Sale of risk participation agreement	0	0
Ending balance	17,016	16,682
Total gains or losses for the annual period included in earnings attributable to the change in unrealized gains or losses relating to assets still held at period end	0	0
Private Equity Investments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Beginning balance	50,820	63,032
Total gains or losses (realized/unrealized) included in earnings	(5,833)	(3,739)
Total gains losses (realized/unrealized) included in other comprehensive income	0	0
Investment securities called	0	0
Discount accretion	0	0
Purchases of private equity securities	13,352	9,906
Sale / paydown of private equity securities	(2,621)	(18,471)
Capitalized interest/dividends	34	92
Purchase of risk participation agreement	0	0
Sale of risk participation agreement	0	0
Ending balance	55,752	50,820
Total gains or losses for the annual period included in earnings attributable to the change in unrealized gains or losses relating to assets still held at period end	(5,658)	(5,914)
Derivatives [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Beginning balance	258	69
Total gains or losses (realized/unrealized) included in earnings	266	43
Total gains losses (realized/unrealized) included in other comprehensive income	0	0
Investment securities called	0	0
Discount accretion	0	0
Purchases of private equity securities	0	0
Sale / paydown of private equity securities	0	0
Capitalized interest/dividends	0	0
Purchase of risk participation agreement	70	404
Sale of risk participation agreement	(91)	(258)
Ending balance	503	258
Total gains or losses for the annual period included in earnings attributable to the change in unrealized gains or losses relating to assets still held at period end	$ 615	$ 306

XML

Fair Value Measurements (Summary of Gains and Losses on Level 3 Assets and Liabilities) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Trading Activity, Gains and Losses, Net [Line Items]
Total gains or losses included in earnings	$ (5,567)	$ (3,696)
Change in unrealized gains or losses relating to assets still held at period end	(5,043)	(5,608)
Loans Fees And Sales [Member]
Trading Activity, Gains and Losses, Net [Line Items]
Total gains or losses included in earnings	231	87
Change in unrealized gains or losses relating to assets still held at period end	580	350
Other Non-Interest Income [Member]
Trading Activity, Gains and Losses, Net [Line Items]
Total gains or losses included in earnings	35	(44)
Change in unrealized gains or losses relating to assets still held at period end	35	(44)
Investment Securities Gains (Losses), Net [Member]
Trading Activity, Gains and Losses, Net [Line Items]
Total gains or losses included in earnings	(5,833)	(3,739)
Change in unrealized gains or losses relating to assets still held at period end	$ (5,658)	$ (5,914)

XML

Fair Value Measurements (Summary of Quantitative Information About Level 3 Fair Value Measurements) (Details)	12 Months Ended
	Dec. 31, 2017
Auction Rate Securities [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, Discounted Cash Flow, Valuation Techniques	Discounted cash flow
Fair Value, Estimated Market Recovery Period, Years	5 years
Private Equity Funds [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, Market Comparable Companies, Valuation Techniques	Market comparable companies
Mortgage Loan Commitments [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, Discounted Cash Flow, Valuation Techniques	Discounted cash flow
Minimum [Member] | Auction Rate Securities [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, Estimated Market Rate, Percent	3.10%
Minimum [Member] | Private Equity Funds [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value Inputs, Earnings before Interest, Taxes, Depreciation, and Amortization Multiple	4.0
Minimum [Member] | Mortgage Loan Commitments [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Probability of Funding	50.40%
Embedded Servicing Value, Mortgage Loan Commitments, Discounted Cash Flow	(0.30%)
Maximum [Member] | Auction Rate Securities [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, Estimated Market Rate, Percent	4.50%
Maximum [Member] | Private Equity Funds [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value Inputs, Earnings before Interest, Taxes, Depreciation, and Amortization Multiple	6.0
Maximum [Member] | Mortgage Loan Commitments [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Probability of Funding	100.00%
Embedded Servicing Value, Mortgage Loan Commitments, Discounted Cash Flow	2.00%
Weighted Average [Member] | Mortgage Loan Commitments [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Weighted Average, Probability of Funding	76.00%
Weighted Average, Embedded Servicing Value	1.10%

XML

Fair Value Measurements (Schedule of Fair Value Disclosures Measured On Nonrecurring Basis) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Collateral dependent impaired loans, fair value	$ 1,236	$ 1,331
Collateral dependent impaired loans, Total Gains (Losses)	(617)	(1,700)
Mortgage servicing rights, fair value	4,653	2,868
Mortgage servicing rights, Total Gains (Losses)	13	7
Foreclosed assets, fair value	0	18
Foreclosed assets, Total Gains (Losses)	(9)	(20)
Long Lived Assets Nonrecurring Basis, fair value	3,378	2,408
Long Lived Assets Nonrecurring Basis Gains (Losses)	(724)	(1,054)
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Collateral dependent impaired loans, fair value	0	0
Mortgage servicing rights, fair value	0	0
Foreclosed assets, fair value	0	0
Long Lived Assets Nonrecurring Basis, fair value	0	0
Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Collateral dependent impaired loans, fair value	0	0
Mortgage servicing rights, fair value	0	0
Foreclosed assets, fair value	0	0
Long Lived Assets Nonrecurring Basis, fair value	0	0
Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Collateral dependent impaired loans, fair value	1,236	1,331
Mortgage servicing rights, fair value	4,653	2,868
Foreclosed assets, fair value	0	18
Long Lived Assets Nonrecurring Basis, fair value	$ 3,378	$ 2,408

XML

Fair Value Of Financial Instruments (Schedule Of Estimated Fair Value Of Financial Instruments) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans Held-for-sale, Fair Value Disclosure	$ 15,300
Available for sale securities	8,774,280	$ 9,649,203
Trading securities	18,269	22,225
Non-marketable	100,758	99,558
Securities Purchased under Agreements to Resell	700,000	725,000
Cash and due from banks	438,439	494,690
Derivative Assets	8,349	13,566
Deferred Compensation Plan Assets	12,843	10,261
Non-interest bearing deposits	7,158,962	7,429,398
Savings, interest checking and money market deposits	11,499,620	11,430,789
Time open and certificates of deposit	1,766,864
Derivative Liability	8,074	13,339
Deferred Compensation Liability, Current and Noncurrent	12,843	10,261
Fair Value Hierarchy, Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities	0	0
Derivative Assets	0	0
Deferred Compensation Plan Assets	12,843	10,261
Derivative Liability	0	0
Deferred Compensation Liability, Current and Noncurrent	12,843	10,261
Fair Value Hierarchy, Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities	18,269	22,225
Derivative Assets	7,723	13,146
Deferred Compensation Plan Assets	0	0
Derivative Liability	7,951	13,177
Deferred Compensation Liability, Current and Noncurrent	0	0
Fair Value Hierarchy, Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities	0	0
Derivative Assets	626	420
Deferred Compensation Plan Assets	0	0
Derivative Liability	123	162
Deferred Compensation Liability, Current and Noncurrent	0	0
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Fair Value Hierarchy, Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale securities	937,011	945,871
Federal funds sold	42,775	15,470
Interest earning deposits with banks	30,631	272,275
Cash and due from banks	438,439	494,690
Deferred Compensation Plan Assets	12,843	10,261
Non-interest bearing deposits	7,158,962	7,429,398
Savings, interest checking and money market deposits	11,499,620	11,430,789
Federal funds purchased	202,370	52,840
Deferred Compensation Liability, Current and Noncurrent	12,843	10,261
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Fair Value Hierarchy, Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans Held-for-sale, Fair Value Disclosure	21,398	14,456
Available for sale securities	7,820,253	8,686,650
Trading securities	18,269	22,225
Derivative Assets	7,723	13,146
Derivative Liability	7,951	13,177
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Fair Value Hierarchy, Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale securities	17,016	16,682
Non-marketable	100,758	99,558
Securities Purchased under Agreements to Resell	700,000	725,000
Derivative Assets	626	420
Time open and certificates of deposit	1,766,864	2,240,908
Securities sold under agreements to repurchase	1,304,768	1,671,065
Other borrowings	1,758	102,049
Derivative Liability	123	162
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Fair Value Hierarchy, Level 3 [Member] | Business [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	4,958,554	4,776,365
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Fair Value Hierarchy, Level 3 [Member] | Real Estate - Construction And Land [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	968,820	791,236
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Fair Value Hierarchy, Level 3 [Member] | Real Estate - Business [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	2,697,452	2,643,374
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Fair Value Hierarchy, Level 3 [Member] | Real Estate - Personal [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	2,062,787	2,010,397
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Fair Value Hierarchy, Level 3 [Member] | Consumer [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	2,104,487	1,990,801
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Fair Value Hierarchy, Level 3 [Member] | Revolving Home Equity [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	400,587	413,634
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Fair Value Hierarchy, Level 3 [Member] | Consumer Credit Card [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	783,864	776,465
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Fair Value Hierarchy, Level 3 [Member] | Overdrafts [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	7,123	10,464
Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value Hierarchy, Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale securities	937,011	945,871
Federal funds sold	42,775	15,470
Interest earning deposits with banks	30,631	272,275
Cash and due from banks	438,439	494,690
Deferred Compensation Plan Assets	12,843	10,261
Non-interest bearing deposits	7,158,962	7,429,398
Savings, interest checking and money market deposits	11,499,620	11,430,789
Federal funds purchased	202,370	52,840
Deferred Compensation Liability, Current and Noncurrent	12,843	10,261
Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value Hierarchy, Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans Held-for-sale, Fair Value Disclosure	21,398	14,456
Available for sale securities	7,820,253	8,686,650
Trading securities	18,269	22,225
Derivative Assets	7,723	13,146
Derivative Liability	7,951	13,177
Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value Hierarchy, Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale securities	17,016	16,682
Non-marketable	100,758	99,558
Securities Purchased under Agreements to Resell	695,194	728,179
Derivative Assets	626	420
Time open and certificates of deposit	1,768,780	2,235,218
Securities sold under agreements to repurchase	1,305,375	1,671,227
Other borrowings	1,758	104,298
Derivative Liability	123	162
Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value Hierarchy, Level 3 [Member] | Business [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	4,971,401	4,787,469
Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value Hierarchy, Level 3 [Member] | Real Estate - Construction And Land [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	979,389	800,426
Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value Hierarchy, Level 3 [Member] | Real Estate - Business [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	2,702,598	2,658,093
Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value Hierarchy, Level 3 [Member] | Real Estate - Personal [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	2,060,443	2,005,227
Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value Hierarchy, Level 3 [Member] | Consumer [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	2,074,129	1,974,784
Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value Hierarchy, Level 3 [Member] | Revolving Home Equity [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	400,333	414,499
Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value Hierarchy, Level 3 [Member] | Consumer Credit Card [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	798,093	794,856
Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value Hierarchy, Level 3 [Member] | Overdrafts [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	$ 7,123	$ 10,464

XML

Derivative Instruments (Narrative) (Details) $ in Millions	Dec. 31, 2017 USD ($)
Derivative [Line Items]
Variation Margin Impact to Positive Fair Values of Cleared Swaps	$ 4.5
Variation Margin Impact to Negative Fair Values of Cleared Swaps	$ 4.3

XML

Derivative Instruments (Schedule Of Notional Amounts Of Derivative Instruments) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Derivative [Line Items]
Notional Amount of Derivatives	$ 1,963,178	$ 1,904,093
Interest Rate Swaps [Member]
Derivative [Line Items]
Notional Amount of Derivatives	1,741,412	1,685,099
Interest Rate Caps [Member]
Derivative [Line Items]
Notional Amount of Derivatives	31,776	59,379
Credit Risk Participation Agreements [Member]
Derivative [Line Items]
Notional Amount of Derivatives	133,488	121,514
Foreign Exchange Contracts [Member]
Derivative [Line Items]
Notional Amount of Derivatives	11,826	4,046
Mortgage Loan Commitments [Member]
Derivative [Line Items]
Notional Amount of Derivatives	17,110	12,429
Mortgage Loan Forward Sale Contracts [Member]
Derivative [Line Items]
Notional Amount of Derivatives	2,566	6,626
Forward TBA Contracts [Member]
Derivative [Line Items]
Notional Amount of Derivatives	$ 25,000	$ 15,000

XML

Derivative Instruments (Schedule Of Fair Values Of Derivative Instruments) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Derivatives, Fair Value [Line Items]
Other assets	$ 8,349	$ 13,566
Other liabilities	(8,074)	(13,339)
Interest Rate Swaps [Member]
Derivatives, Fair Value [Line Items]
Other assets	7,674	12,987
Other liabilities	(7,857)	(12,987)
Interest Rate Caps [Member]
Derivatives, Fair Value [Line Items]
Other assets	16	78
Other liabilities	(16)	(78)
Credit Risk Participation Agreements [Member]
Derivatives, Fair Value [Line Items]
Other assets	46	65
Other liabilities	(123)	(156)
Foreign Exchange Contracts [Member]
Derivatives, Fair Value [Line Items]
Other assets	21	66
Other liabilities	(40)	(4)
Mortgage Loan Commitments [Member]
Derivatives, Fair Value [Line Items]
Other assets	580	355
Other liabilities	0	(6)
Mortgage Loan Forward Sale Contracts [Member]
Derivatives, Fair Value [Line Items]
Other assets	8	0
Other liabilities	(7)	(63)
Forward TBA Contracts [Member]
Derivatives, Fair Value [Line Items]
Other assets	4	15
Other liabilities	$ (31)	$ (45)

XML

Derivative Instruments (Summary Of The Effects Of Derivative Instruments On Consolidated Statements Of Income) (Details) - Not Designated as Hedging Instrument [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) on Derivative Instruments, Net, Pretax	$ 1,580	$ 6,041	$ 4,996
Other Non-Interest Income [Member] | Interest Rate Swaps [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) on Derivative Instruments, Net, Pretax	1,978	5,927	4,309
Other Non-Interest Income [Member] | Interest Rate Caps [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) on Derivative Instruments, Net, Pretax	0	0	32
Other Non-Interest Income [Member] | Credit Risk Participation Agreements [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) on Derivative Instruments, Net, Pretax	35	(44)	57
Other Non-Interest Income [Member] | Foreign Exchange Contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) on Derivative Instruments, Net, Pretax	(80)	55	253
Loans Fees And Sales [Member] | Mortgage Loan Commitments [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) on Derivative Instruments, Net, Pretax	231	87	263
Loans Fees And Sales [Member] | Mortgage Loan Forward Sale Contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) on Derivative Instruments, Net, Pretax	64	(63)	0
Loans Fees And Sales [Member] | Forward TBA Contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) on Derivative Instruments, Net, Pretax	$ (648)	$ 79	$ 82

XML

Derivative Instruments Derivative Instruments (Balance Sheet Offsetting) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Balance Sheet Offsetting [Line Items]
Derivative Assets	$ 8,349	$ 13,566
Derivative Asset, Amount Offset by Liabiilty	0	0
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement	8,349	13,566
Derivative Liability	8,074	13,339
Derivative Liability, Amount Offset by Asset	0	0
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement	8,074	13,339
Derivative Subject to Master Netting Agreement [Member]
Balance Sheet Offsetting [Line Items]
Derivative Asset, Fair Value, Gross Asset	7,726	13,111
Derivative Asset, Amount Offset by Liabiilty	0	0
Derivative Asset, Noncurrent	7,726	13,111
Derivative Asset, Not Offset, Policy Election Deduction	(233)	(3,391)
Derivative Asset, Fair Value of Collateral	(824)	0
Derivative Asset, Fair Value, Amount Offset Against Collateral	6,669	9,720
Derivative Liability, Fair Value, Gross Liability	7,935	13,124
Derivative Liability, Amount Offset by Asset	0	0
Derivative Liability, Noncurrent	7,935	13,124
Derivative Liability, Not Offset, Policy Election Deduction	(233)	(3,391)
Derivative Liability, Fair Value of Collateral	(1,570)	(5,292)
Derivative Liability, Fair Value, Amount Offset Against Collateral	6,132	4,441
Derivative Not Subject to Master Netting Agreement [Member]
Balance Sheet Offsetting [Line Items]
Derivative Asset, Fair Value, Gross Asset	623	455
Derivative Asset, Amount Offset by Liabiilty	0	0
Derivative Asset, Not Subject to Master Netting Arrangement	623	455
Derivative Liability, Fair Value, Gross Liability	139	215
Derivative Liability, Amount Offset by Asset	0	0
Derivative Liability, Not Subject to Master Netting Arrangement	$ 139	$ 215

XML

Resale and Repurchase Agreements (Details) - Collateral Swap [Member] - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Collateral swap agreements	$ 650.0	$ 550.0
Collateral Already Posted, Aggregate Fair Value	661.4
Collateral Accepted, Aggregate Fair Value	$ 661.3

XML

Resale and Repurchase Agreements Balance Sheet Offsetting (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Resale agreement [Member]
Balance Sheet Offsetting [Line Items]
Securities Purchased under Agreements to Resell, Gross	$ 1,350,000	$ 1,275,000
Securities Purchased under Agreements to Resell, Liability	(650,000)	(550,000)
Securities purchased under agreements to resell, net	700,000	725,000
Securities Purchased under Agreements to Resell, Not Subject to Master Netting Arrangement	0	0
Securities Purchased under Agreements to Resell, Collateral, Obligation to Return Securities	(700,000)	(725,000)
Securities Purchased under Agreements to Resell, Amount Offset Against Collateral	0	0
Repurchase agreement [Member]
Balance Sheet Offsetting [Line Items]
Securities Sold under Agreements to Repurchase, Gross	1,954,768	2,221,065
Securities Sold under Agreements to Repurchase, Asset	(650,000)	(550,000)
Securities sold under agreements to repurchase, net	1,304,768	1,671,065
Securities Sold under Agreements to Repurchase, Not Subject to Master Netting Arrangement	0	0
Securities Sold under Agreements to Repurchase, Collateral, Right to Reclaim Securities	(1,304,768)	(1,671,065)
Securities Sold under Agreements to Repurchase, Amount Offset Against Collateral	$ 0	$ 0

XML

Resale and Repurchase Agreements Schedule of Underlying Assets of Repurchase Agreements (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Maturity Overnight [Member] | US Treasury and Government [Member]
Schedule of Underlying Assets of Repurchase Agreements [Line Items]
Assets Sold under Agreements to Repurchase, Repurchase Liability	$ 271,820	$ 294,600
Maturity Overnight [Member] | US Government-sponsored Enterprise Debt Securities [Member]
Schedule of Underlying Assets of Repurchase Agreements [Line Items]
Assets Sold under Agreements to Repurchase, Repurchase Liability	149,111	147,694
Maturity Overnight [Member] | Agency mortgage-backed securities [Member]
Schedule of Underlying Assets of Repurchase Agreements [Line Items]
Assets Sold under Agreements to Repurchase, Repurchase Liability	737,975	693,851
Maturity Overnight [Member] | Asset-backed Securities [Member]
Schedule of Underlying Assets of Repurchase Agreements [Line Items]
Assets Sold under Agreements to Repurchase, Repurchase Liability	89,601	474,830
Maturity Overnight [Member] | Debt Securities [Member]
Schedule of Underlying Assets of Repurchase Agreements [Line Items]
Assets Sold under Agreements to Repurchase, Repurchase Liability	14,780	0
Maturity Overnight [Member] | Repurchase Agreements [Member]
Schedule of Underlying Assets of Repurchase Agreements [Line Items]
Assets Sold under Agreements to Repurchase, Repurchase Liability	1,263,287	1,610,975
Maturity up to 90 days [Member] | US Treasury and Government [Member]
Schedule of Underlying Assets of Repurchase Agreements [Line Items]
Assets Sold under Agreements to Repurchase, Repurchase Liability	1,731	0
Maturity up to 90 days [Member] | US Government-sponsored Enterprise Debt Securities [Member]
Schedule of Underlying Assets of Repurchase Agreements [Line Items]
Assets Sold under Agreements to Repurchase, Repurchase Liability	0	0
Maturity up to 90 days [Member] | Agency mortgage-backed securities [Member]
Schedule of Underlying Assets of Repurchase Agreements [Line Items]
Assets Sold under Agreements to Repurchase, Repurchase Liability	9,750	24,380
Maturity up to 90 days [Member] | Asset-backed Securities [Member]
Schedule of Underlying Assets of Repurchase Agreements [Line Items]
Assets Sold under Agreements to Repurchase, Repurchase Liability	30,000	30,000
Maturity up to 90 days [Member] | Debt Securities [Member]
Schedule of Underlying Assets of Repurchase Agreements [Line Items]
Assets Sold under Agreements to Repurchase, Repurchase Liability	0	0
Maturity up to 90 days [Member] | Repurchase Agreements [Member]
Schedule of Underlying Assets of Repurchase Agreements [Line Items]
Assets Sold under Agreements to Repurchase, Repurchase Liability	41,481	54,380
Maturity Greater than 90 Days [Member] | US Treasury and Government [Member]
Schedule of Underlying Assets of Repurchase Agreements [Line Items]
Assets Sold under Agreements to Repurchase, Repurchase Liability	450,000	300,000
Maturity Greater than 90 Days [Member] | US Government-sponsored Enterprise Debt Securities [Member]
Schedule of Underlying Assets of Repurchase Agreements [Line Items]
Assets Sold under Agreements to Repurchase, Repurchase Liability	0	3,237
Maturity Greater than 90 Days [Member] | Agency mortgage-backed securities [Member]
Schedule of Underlying Assets of Repurchase Agreements [Line Items]
Assets Sold under Agreements to Repurchase, Repurchase Liability	200,000	252,473
Maturity Greater than 90 Days [Member] | Asset-backed Securities [Member]
Schedule of Underlying Assets of Repurchase Agreements [Line Items]
Assets Sold under Agreements to Repurchase, Repurchase Liability	0	0
Maturity Greater than 90 Days [Member] | Debt Securities [Member]
Schedule of Underlying Assets of Repurchase Agreements [Line Items]
Assets Sold under Agreements to Repurchase, Repurchase Liability	0	0
Maturity Greater than 90 Days [Member] | Repurchase Agreements [Member]
Schedule of Underlying Assets of Repurchase Agreements [Line Items]
Assets Sold under Agreements to Repurchase, Repurchase Liability	650,000	555,710
Total Repurchase Agreements [Member] [Domain] | US Treasury and Government [Member]
Schedule of Underlying Assets of Repurchase Agreements [Line Items]
Assets Sold under Agreements to Repurchase, Repurchase Liability	723,551	594,600
Total Repurchase Agreements [Member] [Domain] | US Government-sponsored Enterprise Debt Securities [Member]
Schedule of Underlying Assets of Repurchase Agreements [Line Items]
Assets Sold under Agreements to Repurchase, Repurchase Liability	149,111	150,931
Total Repurchase Agreements [Member] [Domain] | Agency mortgage-backed securities [Member]
Schedule of Underlying Assets of Repurchase Agreements [Line Items]
Assets Sold under Agreements to Repurchase, Repurchase Liability	947,725	970,704
Total Repurchase Agreements [Member] [Domain] | Asset-backed Securities [Member]
Schedule of Underlying Assets of Repurchase Agreements [Line Items]
Assets Sold under Agreements to Repurchase, Repurchase Liability	119,601	504,830
Total Repurchase Agreements [Member] [Domain] | Debt Securities [Member]
Schedule of Underlying Assets of Repurchase Agreements [Line Items]
Assets Sold under Agreements to Repurchase, Repurchase Liability	14,780	0
Total Repurchase Agreements [Member] [Domain] | Repurchase Agreements [Member]
Schedule of Underlying Assets of Repurchase Agreements [Line Items]
Assets Sold under Agreements to Repurchase, Repurchase Liability	$ 1,954,768	$ 2,221,065

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Commitments, Contingencies And Guarantees (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Operating leases, rent expense	$ 7,300	$ 7,100	$ 6,800
Outstanding purchase commitments expected to fund in the next 12 months	114,900
Notional amount of underlying swaps	1,963,178	1,904,093
Financial Standby Letter of Credit [Member]
Carrying value of the guarantee obligations, liability	2,500
Commitments outstanding	387,811	$ 391,899
State Tax Credits [Member]
Purchases of state tax credits	70,900
Sales of state tax credits	47,100
Risk Participation Agreement [Member]
Carrying value of the guarantee obligations, liability	123
Notional amount of underlying swaps	$ 84,100
Risk Participation Agreement [Member] | Minimum [Member]
Risk Participation Agreements, Term	2 years
Risk Participation Agreement [Member] | Maximum [Member]
Risk Participation Agreements, Term	11 years

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Commitments, Contingencies And Guarantees (Summary Of Minimum Lease Commitments) (Details) $ in Thousands	Dec. 31, 2017 USD ($)
2018	$ 6,196
2019	4,951
2020	3,893
2021	3,176
2022	2,678
After	13,383
Total minimum lease payments	34,277
Real Property [Member]
2018	5,981
2019	4,876
2020	3,861
2021	3,162
2022	2,678
After	13,383
Equipment [Member]
2018	215
2019	75
2020	32
2021	14
2022	0
After	$ 0

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Commitments, Contingencies And Guarantees (Schedule Of Off-Balance Sheet Instruments Commitments) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Commercial letters of credit	$ 4,498	$ 2,962
Credit Card [Member]
Commitments to extend credit	5,102,556	4,932,955
Other [Member]
Commitments to extend credit	5,737,181	5,508,686
Financial Standby Letter of Credit [Member]
Standby letters of credit, net of participations	$ 387,811	$ 391,899

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Related Parties (Narrative) (Details)	12 Months Ended
	Dec. 31, 2017 USD ($) $ / Square_Foot Rate shares	Dec. 31, 2016 USD ($) $ / Square_Foot	Dec. 31, 2015 USD ($) $ / Square_Foot
Tower Property [Member]
Percentage of Tower stock owned by the Company's Executive Officers | Rate	66.00%
Company stock owned by Tower | shares	270,646
Tower's long-term line of credit with the Bank	$ 13,500,000
Tower's maximum amount outstanding on the line of credit during period	11,500,000	$ 0	$ 1,300,000
Tower's line of credit, amount borrowed and repaid during the year	5,200,000
Tower's line of credit, current balance	0	0	0
Tower's letters of credit outstanding, amount	0	0	0
Tower's line of credit facility, commitment fee amount	0	0	0
Tower's long-term construction loan	0	0	0
Rent paid to the Company by Tower	$ 74,000	$ 72,000	$ 69,000
Rent per square foot | $ / Square_Foot	15.75	15.67	15.42
Chief Executive Officer [Member]
State tax credits sold by the Company to related party	$ 694,000	$ 549,000	$ 478,000
Former Chief Executive Officer [Member]
State tax credits sold by the Company to related party	0	191,000	40,000
Vice Chairman [Member]
State tax credits sold by the Company to related party	598,000	244,000	372,000
President [Member]
State tax credits sold by the Company to related party	$ 67,000	$ 72,000	$ 65,000

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Related Parties (Schedule Of Related Party Expenses) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Total	$ 2,446	$ 2,485	$ 2,523
Leasing Agent Fees [Member]
Total	32	101	66
Operation Of Parking Garages [Member]
Total	82	184	75
Building Management Fees [Member]
Total	1,954	1,832	1,850
Property Construction Management Fees [Member]
Total	146	147	322
Dividends Paid On Company Stock Held By Tower [Member]
Total	$ 232	$ 221	$ 210

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Parent Company Condensed Financial Statements (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Investments in marketable common and preferred stock	$ 48,838,000	$ 51,263,000
Non-agency mortgage-backed securities	905,793,000	1,055,639,000
Donation of securities	32,036,000	0	$ 0
Commerce Bancshares, Inc. (Parent) [Member]
Note receivable due from bank subsidiary	50,000,000	0
Parent's line of credit facility with the Bank, maximum borrowing capacity	20,000,000
Parent line of credit with Bank, borrowings during period	0	$ 0	$ 0
Investments in marketable common and preferred stock	48,700,000
Non-agency mortgage-backed securities	4,600,000
Unrealized net gain in fair value Investment	44,500,000
Net of tax unrealized gain included in stockholders' equity	27,600,000
Unrealized net of tax gain in fair value of investment securities held by subsidiaries	6,200,000
Gain on donation of appreciated securities	31,100,000
Donation of securities	32,000,000
Gain (Loss) on Sale of Investments	10,000,000
Available for sale securities expected to be redeemed next year	$ 45,900,000

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Parent Company Condensed Financial Statements (Condensed Balance Sheets) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Available for sale securities	$ 8,774,280	$ 9,649,203
Non-marketable securities	100,758	99,558
Other assets	401,074	608,408
Total assets	24,833,415	25,641,424
Other liabilities	180,889	213,243
Total liabilities	22,115,231	23,140,292
Stockholders’ equity	2,716,560	2,495,783
Total liabilities and equity	24,833,415	25,641,424
Commerce Bancshares, Inc. (Parent) [Member]
Investment in consolidated subsidiary, Banks	2,409,098	2,246,060
Investment in consolidated subsidiaries, Non-banks	52,479	51,816
Cash	151,607	51
Securities purchased under agreements to resell	0	155,775
Available for sale securities	53,285	58,051
Non-marketable securities	655	718
Note receivable due from bank subsidiary	50,000	0
Advances to subsidiaries, net of borrowings	14,571	5,053
Income tax benefits	8,279	524
Other assets	19,951	17,716
Total assets	2,759,925	2,535,764
Pension obligation	12,407	17,158
Other liabilities	30,958	22,823
Total liabilities	43,365	39,981
Stockholders’ equity	2,716,560	2,495,783
Total liabilities and equity	$ 2,759,925	$ 2,535,764

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Parent Company Condensed Financial Statements (Condensed Statements Of Income) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Interest and dividends on investment securities	$ 214,689	$ 207,184	$ 191,801
Salaries and employee benefits	448,321	427,310	400,701
Data processing fees paid to affiliates	92,246	92,722	83,944
Community Service	34,377	3,906	3,180
Other	77,459	74,202	73,565
Total non-interest expense	769,684	717,065	676,487
Income tax expense (benefit)	110,506	124,151	116,590
NET INCOME ATTRIBUTABLE TO COMMERCE BANCSHARES, INC.	319,383	275,391	263,730
Commerce Bancshares, Inc. (Parent) [Member]
Dividends received from consolidated subsidiary banks	160,002	160,002	160,001
Earnings of consolidated subsidiaries, net of dividends	147,678	118,704	106,636
Interest and dividends on investment securities	2,099	2,364	2,272
Management fees charged subsidiaries	30,431	30,965	25,713
Investment securities gains (losses)	41,717	1,880	0
Net interest income on advances and note to subsidiaries	514	21	4
Other	3,346	2,720	1,422
Total income	385,787	316,656	296,048
Salaries and employee benefits	33,714	29,116	22,167
Professional fees	2,036	1,951	1,833
Data processing fees paid to affiliates	3,512	3,226	3,186
Community Service	32,093	1,620	991
Other	10,671	9,849	8,278
Total non-interest expense	82,026	45,762	36,455
Income tax expense (benefit)	(15,622)	(4,497)	(4,137)
NET INCOME ATTRIBUTABLE TO COMMERCE BANCSHARES, INC.	$ 319,383	$ 275,391	$ 263,730

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Parent Company Condensed Financial Statements (Condensed Statements Of Cash Flows) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
OPERATING ACTIVITIES:
Net income	$ 319,900	$ 276,854	$ 266,975
Other changes, net	(6,560)	(26,666)	(3,757)
Net cash provided by (used in) operating activities	433,226	435,757	291,195
INVESTING ACTIVITIES
Proceeds from sales of available for sale securities	792,380	24,380	689,031
Proceeds from maturities/pay downs of available for sale securities	1,899,640	2,032,397	2,515,113
Purchases of investment securities	(1,853,817)	(1,988,101)	(3,542,537)
Purchases of land, buildings and equipment	(30,824)	(24,478)	(31,897)
Net cash provided by (used in) investing activities	220,720	(805,213)	(1,195,402)
FINANCING ACTIVITIES
Purchases of treasury stock	(17,771)	(39,381)	(23,176)
Issuance of stock under equity compensation plans	8	6
Proceeds from stock options exercised			1,914
Cash dividends paid on common stock	(91,619)	(87,070)	(84,961)
Cash dividends paid on preferred stock	(9,000)	(9,000)	(9,000)
Net cash provided by (used in) financing activities	(924,536)	649,172	306,209
Increase (decrease) in cash and cash equivalents	(270,590)	279,716	(597,998)
Cash and cash equivalents at beginning of year	782,435	502,719	1,100,717
Cash and cash equivalents at end of year	511,845	782,435	502,719
Income tax payments (receipts), net	120,744	119,596	95,341
Commerce Bancshares, Inc. (Parent) [Member]
OPERATING ACTIVITIES:
Net income	319,383	275,391	263,730
Earnings of consolidated subsidiaries, net of dividends	(147,678)	(118,704)	(106,636)
Other changes, net	(11,268)	9,541	(1,152)
Net cash provided by (used in) operating activities	160,437	166,228	155,942
INVESTING ACTIVITIES
(Increase) decrease in securities purchased under agreements to resell	155,775	(51,335)	57,210
(Increase) decrease in investment in subsidiaries, net	11	4	(6)
Proceeds from sales of available for sale securities	11,006	2,949	0
Proceeds from maturities/pay downs of available for sale securities	2,295	4,105	3,516
Purchases of investment securities	0	0	2,500
Origination of Notes Receivable from Related Parties	(50,000)	0	0
(Increase) decrease in advances to subsidiaries, net	(9,518)	13,507	1,171
Purchases of land, buildings and equipment	(52)	(3)	(113)
Net cash provided by (used in) investing activities	109,517	(30,773)	59,278
FINANCING ACTIVITIES
Purchases of treasury stock	(17,771)	(39,381)	(23,176)
Accelerated stock repurchase agreement	0	0	(100,000)
Issuance of stock under equity compensation plans	(8)	(6)
Proceeds from stock options exercised			1,914
Cash dividends paid on common stock	(91,619)	(87,070)	(84,961)
Cash dividends paid on preferred stock	(9,000)	(9,000)	(9,000)
Net cash provided by (used in) financing activities	(118,398)	(135,457)	(215,223)
Increase (decrease) in cash and cash equivalents	151,556	(2)	(3)
Cash and cash equivalents at beginning of year	51	53	56
Cash and cash equivalents at end of year	151,607	51	53
Income tax payments (receipts), net	$ (8,991)	$ (8,958)	$ 1,278