10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, DC 20549

 ______________________________________

FORM 10-Q

______________________________________ 

(Mark One)

x QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the quarterly period ended March 31, 2018

OR

¨ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the transition period from            To                

Commission file number 0-12508

______________________________________ 

S&T BANCORP, INC.

(Exact name of registrant as specified in its charter)

______________________________________ 

Pennsylvania	25-1434426
(State or other jurisdiction of incorporation or organization)	(IRS Employer Identification No.)
800 Philadelphia Street, Indiana, PA	15701
(Address of principal executive offices)	(zip code)

800-325-2265

(Registrant’s telephone number, including area code)

Not Applicable

(Former name, former address, and former fiscal year, if changed since last report)

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  x    No  ¨

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 (Section 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  x    No  ¨

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a 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.

Large accelerated filer	x	Accelerated filer	¨
Non-accelerated filer	¨ (Do not check if a smaller reporting company)	Smaller reporting company	¨
		Emerging growth 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. ¨

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

APPLICABLE ONLY TO CORPORATE ISSUERS:

Indicate the number of shares outstanding of each of the issuer’s classes of common stock, as of the latest practical date.

Common Stock, $2.50 Par Value - 35,000,681 shares as of May 3, 2018

S&T BANCORP, INC. AND SUBSIDIARIES

INDEX

S&T BANCORP, INC. AND SUBSIDIARIES

		Page No.
PART I. FINANCIAL INFORMATION
Item 1.	Financial Statements
	Consolidated Balance Sheets - March 31, 2018 and December 31, 2017	2
	Consolidated Statements of Comprehensive Income - Three Months Ended March 31, 2018 and 2017	3
	Consolidated Statements of Changes in Shareholders' Equity - Three Months Ended March 31, 2018 and 2017	4
	Consolidated Statements of Cash Flows - Three Months Ended March 31, 2018 and 2017	5
	Notes to Consolidated Financial Statements	6
Item 2.	Management's Discussion and Analysis of Financial Condition and Results of Operations	34
Item 3.	Quantitative and Qualitative Disclosures About Market Risk	49
Item 4.	Controls and Procedures	50
PART II. OTHER INFORMATION
Item 1.	Legal Proceedings	52
Item 1A.	Risk Factors	52
Item 2.	Unregistered Sales of Equity Securities and Use of Proceeds	52
Item 3.	Defaults Upon Senior Securities	52
Item 4.	Mine Safety Disclosures	52
Item 5.	Other Information	52
Item 6.	Exhibits	53
	Signatures	54

1

S&T BANCORP, INC. AND SUBSIDIARIES

CONSOLIDATED BALANCE SHEETS

(Unaudited)

	March 31, 2018			December 31, 2017
(dollars in thousands, except per share data)	(Unaudited)			(Audited)
ASSETS
Cash and due from banks, including interest-bearing deposits of $67,831 and $61,965 at March 31, 2018 and December 31, 2017	$	112,849		$	117,152
Securities, at fair value	687,650			698,291
Loans held for sale	3,283			4,485
Portfolio loans, net of unearned income	5,730,613			5,761,449
Allowance for loan losses	(59,046		)	(56,390		)
Portfolio loans, net	5,671,567			5,705,059
Bank owned life insurance	72,629			72,150
Premises and equipment, net	41,635			42,702
Federal Home Loan Bank and other restricted stock, at cost	29,769			29,270
Goodwill	287,446			291,670
Other intangible assets, net	3,126			3,677
Other assets	95,375			95,799
Total Assets	$	7,005,329		$	7,060,255
LIABILITIES
Deposits:
Noninterest-bearing demand	$	1,368,350		$	1,387,712
Interest-bearing demand	560,711			603,141
Money market	1,239,400			1,146,156
Savings	876,459			893,119
Certificates of deposit	1,342,174			1,397,763
Total Deposits	5,387,094			5,427,891
Securities sold under repurchase agreements	44,617			50,161
Short-term borrowings	525,000			540,000
Long-term borrowings	46,684			47,301
Junior subordinated debt securities	45,619			45,619
Other liabilities	60,908			65,252
Total Liabilities	6,109,922			6,176,224
SHAREHOLDERS’ EQUITY
Common stock ($2.50 par value) Authorized—50,000,000 shares Issued—36,130,480 shares at March 31, 2018 and December 31, 2017 Outstanding— 35,000,502 shares at March 31, 2018 and 34,971,929 shares at December 31, 2017	90,326			90,326
Additional paid-in capital	216,618			216,106
Retained earnings	649,925			628,107
Accumulated other comprehensive (loss) income	(29,953		)	(18,427		)
Treasury stock (1,129,978 shares at March 31, 2018 and 1,158,551 shares at December 31, 2017, at cost)	(31,509		)	(32,081		)
Total Shareholders’ Equity	895,407			884,031
Total Liabilities and Shareholders’ Equity	$	7,005,329		$	7,060,255

See Notes to Consolidated Financial Statements

2

S&T BANCORP, INC. AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME

(Unaudited)

	Three Months Ended March 31,
(dollars in thousands, except per share data)	2018		2017
INTEREST INCOME
Loans, including fees	$	63,055	$	56,900
Investment Securities:
Taxable	3,429		2,848
Tax-exempt	874		920
Dividends	671		482
Total Interest Income	68,029		61,150
INTEREST EXPENSE
Deposits	7,846		5,379
Borrowings and junior subordinated debt securities	3,251		1,893
Total Interest Expense	11,097		7,272
NET INTEREST INCOME	56,932		53,878
Provision for loan losses	2,472		5,183
Net Interest Income After Provision for Loan Losses	54,460		48,695
NONINTEREST INCOME
Net gain (loss) on sale of securities	—		370
Service charges on deposit accounts	3,241		3,014
Debit and credit card	3,037		2,843
Wealth management	2,682		2,403
Gain on sale of a majority interest of insurance business	1,873		—
Mortgage banking	602		733
Insurance	169		1,457
Other	2,188		2,176
Total Noninterest Income	13,792		12,996
NONINTEREST EXPENSE
Salaries and employee benefits	18,815		20,541
Net occupancy	2,873		2,815
Data processing	2,325		2,223
Furniture, equipment and software	1,957		2,047
Other taxes	1,848		976
FDIC insurance	1,108		1,123
Professional services and legal	1,051		1,068
Marketing	702		754
Other	5,403		5,261
Total Noninterest Expense	36,082		36,808
Income Before Taxes	32,170		24,883
Provision for income taxes	6,007		6,695
Net Income	$	26,163	$	18,188
Earnings per share—basic	$	0.75	$	0.52
Earnings per share—diluted	$	0.75	$	0.52
Dividends declared per share	$	0.22	$	0.20
Comprehensive Income	$	14,637	$	19,376

See Notes to Consolidated Financial Statements

3

S&T BANCORP, INC. AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY

(Unaudited)

(dollars in thousands, except share and per share data)	Common Stock		Additional Paid-in Capital		Retained Earnings			Accumulated Other Comprehensive (Loss)/Income			Treasury Stock			Total
Balance at January 1, 2017	$	90,326	$	213,098	$	585,891		$	(13,784	)	$	(33,575	)	$	841,956
Net income for three months ended March 31, 2017	—		—		18,188			—			—			18,188
Other comprehensive income (loss), net of tax	—		—		—			1,188			—			1,188
Cash dividends declared ($0.20 per share)	—		—		(6,960		)	—			—			(6,960		)
Treasury stock issued for restricted awards (74,903 shares, net of 7,370 forfeitures)	—		—		(2,014		)	—			1,820			(194		)
Recognition of restricted stock compensation expense	—		1,002		—			—			—			1,002
Balance at March 31, 2017	$	90,326	$	214,100	$	595,105		$	(12,596	)	$	(31,755	)	$	855,180
Balance at January 1, 2018	$	90,326	$	216,106	$	628,107		$	(18,427	)	$	(32,081	)	$	884,031
Net income for three months ended March 31, 2018	—		—		26,163			—			—			26,163
Other comprehensive income (loss), net of tax	—		—		—			(6,973		)	—			(6,973		)
Reclassification of tax effects from the Tax Act(1)	—		—		3,691			(3,691		)	—			—
Reclassification of net unrealized gains on equity securities(2)	—		—		862			(862		)	—			—
Cash dividends declared ($0.22 per share)	—		—		(7,669		)	—			—			(7,669		)
Treasury stock issued for restricted awards (66,165 shares, net of 37,592 forfeitures)	—		—		(1,229		)	—			572			(657		)
Recognition of restricted stock compensation expense	—		512		—			—			—			512
Balance at March 31, 2018	$	90,326	$	216,618	$	649,925		$	(29,953	)	$	(31,509	)	$	895,407

See Notes to Consolidated Financial Statements

⁽¹⁾Reclassification due to the adoption of ASU No. 2018-02 - $(3,924) relates to funded status of pension and $233 relates to net unrealized gains on available-for-sale securities.

⁽²⁾Reclassification due to the adoption of ASU No. 2016-01

4

S&T BANCORP, INC. AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF CASH FLOWS

(Unaudited)

	Three Months Ended March 31,
(dollars in thousands)	2018			2017
OPERATING ACTIVITIES
Net income	$	26,163		$	18,188
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for loan losses	2,472			5,183
Recovery for unfunded loan commitments	(71		)	(458		)
Net depreciation, amortization and accretion	1,017			369
Net amortization of discounts and premiums on securities	796			1,030
Stock-based compensation expense	512			1,002
Securities gains, net	—			(370		)
Mortgage loans originated for sale	(16,827		)	(15,694		)
Proceeds from the sale of mortgage loans	18,326			16,575
Gain on the sale of mortgage loans, net	(296		)	(193		)
Gain on the sale of majority interest of insurance business	(1,873		)	—
Net decrease (increase) in interest receivable	336			(62		)
Net decrease in interest payable	(720		)	(435		)
Net decrease in other assets	4,120			3,404
Net increase in other liabilities	3,836			1,768
Net Cash Provided by Operating Activities	37,791			30,307
INVESTING ACTIVITIES
Purchases of securities	(27,565		)	(36,604		)
Proceeds from maturities, prepayments and calls of securities	22,104			16,942
Proceeds from sales of securities	—			582
Net (purchases) sales of Federal Home Loan Bank stock	(499		)	2,078
Net decrease (increase) in loans	27,717			(151,438		)
Proceeds from sale of loans not originated for resale	2,060			2,657
Purchases of premises and equipment	(309		)	(745		)
Proceeds from the sale of premises and equipment	109			16
Proceeds from the sale of majority interest of insurance business	4,540			—
Net Cash Provided by (Used in) Investing Activities	28,157			(166,512		)
FINANCING ACTIVITIES
Net increase in core deposits	14,793			62,219
Net (decrease) increase in certificates of deposit	(55,557		)	100,799
Net decrease in securities sold under repurchase agreements	(5,544		)	(3,845		)
Net increase in short-term borrowings	(15,000		)	(50,000		)
Repayments of long-term borrowings	(617		)	(595		)
Treasury shares issued-net	(657		)	(194		)
Cash dividends paid to common shareholders	(7,669		)	(6,960		)
Net Cash (Used in) Provided by Financing Activities	(70,251		)	101,424
Net decrease in cash and cash equivalents	(4,303		)	(34,781		)
Cash and cash equivalents at beginning of period	117,152			139,486
Cash and Cash Equivalents at End of Period	$	112,849		$	104,705
Supplemental Disclosures
Loans transferred to held for sale	$	2,060		$	—
Loans transferred to portfolio from held for sale	$	—		$	250
Interest paid	$	11,817		$	7,706
Income taxes paid, net of refunds	$	108		$	172
Transfer net assets to investment in insurance company partnership	$	1,917		$	—
Transfers to other real estate owned and other repossessed assets	$	2,599		$	397

See Notes to Consolidated Financial Statements

5

S&T BANCORP, INC. AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

NOTE 1. BASIS OF PRESENTATION

Principles of Consolidation

The interim Consolidated Financial Statements include the accounts of S&T Bancorp, Inc., or S&T, and its wholly owned subsidiaries. All significant intercompany transactions have been eliminated in consolidation. Investments of 20 percent to 50 percent of the outstanding common stock of investees are accounted for using the equity method of accounting.

Basis of Presentation

The accompanying unaudited interim Consolidated Financial Statements of S&T have been prepared in accordance with generally accepted accounting principles, or GAAP, in the United States for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by GAAP for complete financial statements and should be read in conjunction with the audited consolidated financial statements included in our annual report on Form 10-K for the year ended December 31, 2017, filed with the Securities and Exchange Commission, or SEC, on March 1, 2018. In the opinion of management, the accompanying interim financial information reflects all adjustments, consisting of normal recurring adjustments, necessary to present fairly our financial position and the results of operations for each of the interim periods presented. Results of operations for interim periods are not necessarily indicative of the results of operations that may be expected for a full year or any future period.

On January 1, 2018, we sold a 70 percent majority interest in the assets of our wholly-owned subsidiary S&T Evergreen Insurance, LLC. We transferred our remaining ownership interest in the net assets of S&T Evergreen Insurance, LLC for a 30 percent ownership interest in a new partnership entity. We will use the equity-method of accounting to recognize our partial ownership interest in the new entity.

Reclassification

Amounts in prior period financial statements and footnotes are reclassified whenever necessary to conform to the current period presentation. Reclassifications had no effect on our results of operations or financial condition.

Use of Estimates

The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosures of contingent assets and liabilities at the date of the financial statements. Actual results could differ from those estimates.

Recently Adopted Accounting Standards Updates, or ASU or Update

Income Taxes - Amendments to SEC Paragraphs Pursuant to SEC Staff Accounting Bulletin No. 118

In March 2018, the FASB issued ASU No. 2018-05 Income Taxes - Amendments to SEC Paragraphs Pursuant to SEC Staff Accounting Bulletin No. 118. The amendments in this ASU add various SEC paragraphs pursuant to the issuance of the SEC Staff Accounting Bulletin to the Accounting Standards Codification Subtopic 740-10. We adopted the amendments in this ASU in conjunction with ASU 2018-02 Reclassification of Certain Tax Effects from AOCI. This ASU had no impact to our Balance Sheets or Statements of Comprehensive Income.

Investments - Debt Securities and Regulated Operations - Amendments to SEC Paragraphs Pursuant to SEC Staff Accounting Bulletin No. 117 and SEC Release No. 33-9273

In March 2018, the FASB issued ASU No. 2018-04 Investments - Debt Securities and Regulated Operations - Amendments to SEC Paragraphs Pursuant to SEC Staff Accounting Bulletin No. 117 and SEC Release No. 33-9273. The amendments in this ASU add various SEC paragraphs pursuant to the issuance of the SEC Staff Accounting Bulletin to the Accounting Standards Codification Subtopics 320 and 980. We adopted the amendments in this ASU in conjunction with ASU 2016-01 as it relates to equity securities.

6

S&T BANCORP, INC. AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS – continued

NOTE 1. BASIS OF PRESENTATION - continued

Income Statement -- Reporting Comprehensive Income - Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income

In February 2018, the FASB issued ASU No. 2018-02, Income Statement - Reporting Comprehensive Income (Topic 220), Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income. The amendments in this Update allow a reclassification from accumulated other comprehensive income to retained earnings for stranded tax effects resulting from the Tax Cuts and Jobs Act, or Tax Act. The amendments eliminate the stranded tax effects resulting from the Tax Act and will improve the usefulness of information reported to financial statement users and will require certain disclosures about the stranded tax effects. This Update is effective for all entities for fiscal years beginning after December 15, 2018 and interim periods within those fiscal years. Early adoption is permitted, including adoption in any interim period, for public business entities for reporting periods for which financial statements have not been issued or made available for issuance. We have elected to reclassify all tax effects related to the Tax Act from accumulated other comprehensive income, or AOCI, to retained earnings as of January 1, 2018. As such, we have early adopted this Update and reclassified $3.7 million for the release of stranded income tax effects relating to unrealized gains and losses on our securities portfolio and our pension plan from AOCI, to retained earnings as of March 31, 2018. The adoption of this ASU had no impact on our Statements of Comprehensive Income. Our policy for releasing income tax effects from AOCI is to release them as investments are sold or mature and liabilities are extinguished.

Compensation - Retirement Benefits - Improving the Presentation of Net Periodic Pension Costs and Net Periodic Post Retirement Benefit Costs

In March 2017, the FASB issued ASU No. 2017-07, Compensation Retirement Benefits - Improving the Presentation of Net Periodic Pension Costs and Net Periodic Post Retirement Benefit Costs (Topic 715). The main objective of this ASU is to provide financial statement users with clearer and disaggregated information related to the components of net periodic benefit cost and improve transparency of the presentation of net periodic benefit cost in the financial statements. This Update is effective for interim and annual reporting periods in fiscal years beginning after December 15, 2017. Early adoption is permitted as of the beginning of an annual period for which financial statements have not been issued or made available for issuance. Effective March 31, 2016, our qualified and nonqualified defined benefit plans were amended to freeze benefit accruals for all persons entitled to benefits under the plan; as such, the adoption of this ASU had no impact on our Consolidated Balance Sheets or Consolidated Statements of Comprehensive Income.

Other Income - Gains and Losses from the Derecognition of Nonfinancial Assets - Clarifying the Scope of Assets Derecognition Guidance and Accounting for Partial Sales of Nonfinancial Assets

In February 2017, the FASB issued ASU No. 2017-05, Other Income - Gains and Losses from the Derecognition of Nonfinancial Assets (Subtopic 610-20). The main objective of this ASU is intended to provide greater detail on what types of transactions should be accounted for as partial sales of nonfinancial assets. The scope of this ASU, as originally issued in ASU No. 2014-09, is intended to reduce the complexity of current GAAP requirements by clarifying which accounting guidance applies to various types of contracts that transfer assets or ownership interest to another entity. This Update was effective for interim and annual reporting periods in fiscal years beginning after December 15, 2017 and at the same time that ASU No. 2014-09 was effective. Early adoption was permitted, but only as of annual reporting periods beginning after December 15, 2016, including interim reporting periods within that reporting period. The adoption of this ASU was applied to the partial sale of our insurance subsidiary. As such, the subsidiary is no longer included in our consolidated financial statements and we recognized a $1.9 million gain on the transaction.

Business Combinations - Clarifying the Definition of a Business

In January 2017, the FASB issued ASU No. 2017-01, Business Combinations - Clarifying the Definition of a Business (Topic 805). The main objective of this ASU is to help financial statement preparers evaluate whether a set of transferred assets and activities (either acquired or disposed of) is a business under Topic 805, Business Combinations by changing the definition of a business. The revised definition will result in fewer acquisitions being accounted for as business combinations than under existing guidance. The definition of a business is significant because it affects the accounting for acquisitions, the identification of reporting units, consolidation evaluations and the accounting for dispositions. This Update was effective for interim and annual reporting periods in fiscal years beginning after December 15, 2017. Early adoption was permitted for transactions not yet reflected in financial statements that have been issued or made available for issuance. The adoption of this ASU had no impact on our Balance Sheets or Statements of Comprehensive Income.

7

S&T BANCORP, INC. AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS – continued

NOTE 1. BASIS OF PRESENTATION - continued

Income Taxes - Intra-Entity Transfers of Assets Other Than Inventory

In October 2016, the FASB issued ASU No. 2016-16, Intra-Entity Transfers of Assets Other Than Inventory. The main objective of this ASU is to require companies to recognize the income tax effects of intercompany sales and transfers of assets other than inventory in the period in which the transfer occurs. This represents a change from existing guidance, which requires companies to defer the income tax effects of intercompany transfers of assets until the asset has been sold to an outside party or otherwise recognized. The new guidance will require companies to defer the income tax effects only of intercompany transfers of inventory. This Update is effective for annual periods beginning after December 15, 2017. Early adoption is permitted as of the beginning of an annual period. If an entity chooses to early adopt the amendments in the ASU, it must do so in the first interim period of its annual financial statements. That is, an entity cannot adopt the amendments in the ASU in a later interim period and apply them as if they were in effect as of the beginning of the year. The adoption of this ASU had no impact on our Balance Sheets or Statements of Comprehensive Income.

Statement of Cash Flows - Classification of Certain Cash Receipts and Cash Payments

In August 2016, the FASB issued ASU No. 2016-15, Classification of Certain Cash Receipts and Cash Payments. The main objective of this ASU is to reduce diversity in practice in how certain transactions are classified in the statement of cash flows. The amendments in this Update provide guidance on the following eight specific cash flow issues: debt prepayment or debt extinguishment costs, settlement of zero-coupon debt instruments, contingent consideration payments made after a business combination, proceeds from the settlement of insurance claims, proceeds from the settlement of bank-owned life insurance (BOLI) policies, distributions received from equity method investments, beneficial interests in securitization transactions, and separately identifiable cash flows and application of the predominance principle. This Update was effective for interim and annual reporting periods in fiscal years beginning after December 15, 2017. Early adoption was permitted, provided that all of the amendments are adopted in the same period. The adoption of this ASU had no material impact to the presentation of activities in our Statements of Cash Flows.

Revenue from Contracts with Customers

In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers (Topic 606). The new revenue pronouncement creates a single source of revenue guidance for all companies in all industries and is more principles-based than current revenue guidance. The pronouncement provides a five-step model for a company to recognize revenue when it transfers control of goods or services to customers at an amount that reflects the consideration to which it expects to be entitled in exchange for those goods or services. The five steps are: 1. identify the contract with the customer; 2. identify the separate performance obligations in the contract; 3. determine the transaction price; 4. allocate the transaction price to the separate performance obligations; and 5. recognize revenue when each performance obligation is satisfied. In August 2015, the FASB issued ASU No. 2015-14, Revenue from Contracts with Customers (Topic 606): Deferral of the Effective Date. This ASU defers the effective date of ASU No. 2014-09 for all entities by one year.

In March 2016, the FASB issued ASU No. 2016-08, Principal versus Agent Considerations (Reporting Revenue Gross versus Net), as an amendment to ASU No. 2014-09 to improve Topic 606, Revenue from Contracts with Customers, by reducing: 1. the potential for diversity in practice arising from inconsistent application of the principal versus agent guidance, and; 2. the cost and complexity of applying Topic 606 both at transition and on an ongoing basis.

In April 2016, the FASB issued ASU No. 2016-10, Identifying Performance Obligations and Licensing, as an amendment to ASU No. 2014-09 to improve Topic 606, Revenue from Contracts with Customers, by reducing: 1. the potential for diversity in practice at initial application and; 2. the cost and complexity of applying Topic 606 both at transition and on an ongoing basis.

In May 2016, the FASB issued ASU No. 2016-12, Narrow-scope Improvements and Practical Expedients. The amendments in this ASU do not change the core principles of Topic 606, Revenue from Contracts with Customers. These amendments affect only the narrow aspects of Topic 606: 1. Collectibility Criterion; 2. Presentation of Sales Taxes and Other Similar Taxes Collected from Customers; 3. Noncash Consideration; 4. Contract Modifications at Transition and; 5. Completed Contracts at Transition.

ASU 2014-09, including transition requirements for all amendments, was effective for interim and annual reporting periods in fiscal years beginning after December 15, 2017. Early adoption was permitted as of the original effective date for interim and annual reporting periods in fiscal years beginning after December 15, 2016. As of January 1, 2018, we adopted ASU 2014-09 Revenue from Contracts with Customers — Topic 606 and all subsequent ASUs that modified Topic 606. The ASU requires that we identify the contract with a customer, identity the performance obligations in the contract, determine the transaction price, allocate the transaction price to the performance obligations in the contract and recognize revenue when we satisfy a performance obligation. We generally satisfy our performance obligations on our contracts with customers as services are

8

S&T BANCORP, INC. AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS – continued

NOTE 1. BASIS OF PRESENTATION - continued

rendered and the transaction prices are typically fixed; charged whether on a periodic basis or based on activity. Because performance obligations are satisfied as services are rendered and the transaction prices are fixed, there is little judgment involved in applying Topic 606 that significantly affects the determination of the amount and timing of revenue from contracts with customers.

Significant revenue has not been recognized in the current reporting period that results from performance obligations satisfied in previous periods. The implementation guidance had no material impact on the measurement or timing of revenue recognition.

Our primary sources of revenue are derived from interest and dividends earned on loans, investment securities and other financial instruments that are not within the scope of Topic 606. We have evaluated the nature of our contracts with customers and related revenue streams, including services charges on deposit accounts, debit and credit cards and wealth management and determined that further disaggregation of revenue from contracts with customers into more granular categories beyond what is presented in the Consolidated Statements of Comprehensive Income was not necessary. We have also completed our evaluation of certain costs related to these revenue streams to determine whether such costs should be presented as expenses or contra-revenue. The adoption of this ASU had no material impact on our Balance Sheets or Statements of Comprehensive Income.

Accounting for Financial Instruments - Overall: Classification and Measurement

In January 2016, the FASB issued ASU No. 2016-01, Accounting for Financial Instruments - Overall: Classification and Measurement (Subtopic 825-10). The amendments in this ASU address the following: 1. require equity investments to be measured at fair value with changes in fair value recognized in net income; 2. simplify the impairment assessment of equity investments without readily-determinable fair values by requiring a qualitative assessment to identify impairment; 3. eliminate the requirement to disclose the method(s) and significant assumptions used to estimate the fair value that is required to be disclosed for financial instruments measured at amortized cost on the balance sheet; 4. require entities to use the exit price notion when measuring the fair value of financial instruments for disclosure purposes; 5. require separate presentation in other comprehensive income for the portion of the total change in the fair value of a liability resulting from a change in the instrument-specific credit risk when the entity has elected to measure the liability at fair value in accordance with the fair value option for financial instruments; 6. require separate presentation of financial assets and financial liabilities by measurement category and form of financial asset (that is, securities or loans and receivables) on the balance sheet or in the accompanying notes to the financial statements; and 7. clarify that an entity should evaluate the need for a valuation allowance on a deferred tax asset related to available-for-sale securities in combination with the entity's other deferred tax assets. This ASU was effective for annual and interim periods in fiscal years beginning after December 15, 2017. We adopted ASU No. 2016-01 January 1, 2018 and have concluded that the provisions of this ASU did not materially impact our Balance Sheets or Statements of Comprehensive Income. The new guidance resulted in a change in the fair value measurement of our loan portfolio as of March 31, 2018 using an exit price notion (see Note 3: Fair Value Measurements). The new guidance also resulted in a cumulative-effect adjustment of $0.9 million from AOCI, to retained earnings at January 1, 2018 for net unrealized gains on our marketable equities portfolio. As a result of the new guidance we recognized $0.1 million of net unrealized gains in our Statements of Comprehensive Income during the three months ended March 31, 2018 on our marketable equity securities portfolio.

Recently Issued Accounting Standards

Leases - Land Easement Practical Expedient for Transition to Topic 842

In January 2018, the FASB issued ASU No. 2018-01 Leases - Land Easement Practical Expedient for Transition to Topic 842. The amendments in this ASU permit an entity to elect an optional transition practical expedient to not evaluate under Topic 842 land easements, that exist or expired before the entity's adoption of Topic 842 and that were not previously accounted for as leases under Topic 840. We are evaluating the amendments in this ASU; however, we do not anticipate that these amendments will materially impact to our Balance Sheets or Statements of Comprehensive Income.

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS – continued

NOTE 1. BASIS OF PRESENTATION - continued

Intangibles - Goodwill and Other - Simplifying the Test for Goodwill Impairment

In January 2017, the FASB issued ASU No. 2017-04, Intangibles - Goodwill and Other - Simplifying the Test for Goodwill Impairment (Topic 350). The main objective in this ASU is intended to simplify the current requirements for testing goodwill for impairment by eliminating step two from the goodwill impairment test. The amendments are expected to reduce the complexity and costs associated with performing the goodwill impairment test, which could result in recording impairment charges sooner than under the current guidance. This Update is effective for any interim and annual impairment tests in reporting periods in fiscal years beginning after December 15, 2019. Early adoption is permitted for interim or annual goodwill impairment tests performed on testing dates after January 1, 2017. We are evaluating the provisions of this ASU; however, we do not anticipate that this ASU will materially impact our Balance Sheets or Statements of Comprehensive Income.

Financial Instruments - Credit Losses

In June 2016, the FASB issued ASU No. 2016-13, Measurement of Credit Losses on Financial Instruments. The main objective of this ASU is to provide financial statement users with more decision-useful information about the expected credit losses on financial instruments and other commitments to extend credit held by a reporting entity at each reporting date. The amendments of this Update replace the incurred loss impairment methodology in current GAAP with a methodology that reflects expected credit losses and requires consideration of a broader range of reasonable and supportable information to inform credit loss estimates. The collective changes to the recognition and measurement accounting standards for financial instruments and their anticipated impact on the allowance for credit losses modeling have been universally referred to as the CECL, or current expected credit loss, model. This Update is effective for interim and annual reporting periods in fiscal years beginning after December 15, 2019. Early adoption is permitted as of fiscal years beginning after December 15, 2018, including interim periods within those fiscal years. We have created a CECL Committee to govern the implementation of these amendments consisting of key stakeholders from Credit Administration, Finance, Risk Management and Audit. We have engaged a third-party to assist us in developing our CECL methodology. We continue to evaluate the provisions of this ASU to determine the potential impact on our Balance Sheets and Statements of Comprehensive Income.

Leases - Section A-Amendments to the FASB Accounting Standards Codification, Section B-Conforming Amendments Related to Leases and Section C-Background Information and Basis for Conclusions

In February 2016, the FASB issued ASU No. 2016-02, Leases, which requires lessees to recognize a right-to-use asset and a lease obligation for all leases on the balance sheet. Lessor accounting remains substantially similar to current GAAP. ASU 2016-02 supersedes Topic 840, Leases. This ASU is effective for annual and interim periods in fiscal years beginning after December 15, 2018. ASU 2016-02 mandates a modified retrospective transition method for all entities. Early adoption of this ASU is permitted. We anticipate that this ASU will impact our financial statements as it relates to the recognition of right-to-use assets and lease obligations on our Consolidated Balance Sheets. We have numerous lease agreements for our branch and loan production offices, which are currently accounted for as operating leases. We expect the new guidance will require these lease agreements to be included on our Balance Sheets as right-to-use assets with a corresponding lease liability. We expect that these changes to our Balance Sheets will impact our regulatory capital ratios. We have compiled a preliminary inventory of our leases and continue to evaluate the standard. We anticipate that this ASU will impact total assets and total liabilities presented on our Balance Sheets; however, we do not believe that it will materially impact our Statements of Comprehensive Income.

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS – continued

NOTE 2. EARNINGS PER SHARE

The following table reconciles the numerators and denominators of basic and diluted earnings per share for the periods presented:

	Three Months Ended March 31,
(in thousands, except share and per share data)	2018		2017
Numerator for Earnings per Share—Basic:
Net income	$	26,163	$	18,188
Less: Income allocated to participating shares	80		60
Net Income Allocated to Shareholders	$	26,083	$	18,128
Numerator for Earnings per Share—Diluted:
Net income	$	26,163	$	18,188
Net Income Available to Shareholders	$	26,163	$	18,188
Denominators for Earnings per Share:
Weighted Average Shares Outstanding—Basic	34,756,726		34,690,250
Add: Potentially dilutive shares	242,439		222,011
Denominator for Treasury Stock Method—Diluted	34,999,165		34,912,261
Weighted Average Shares Outstanding—Basic	34,756,726		34,690,250
Add: Average participating shares outstanding	106,722		115,395
Denominator for Two-Class Method—Diluted	34,863,448		34,805,645
Earnings per share—basic	$	0.75	$	0.52
Earnings per share—diluted	$	0.75	$	0.52
Warrants considered anti-dilutive excluded from potentially dilutive shares - exercise price $31.53 per share, expires January 2019	400,722		447,103
Restricted stock considered anti-dilutive excluded from potentially dilutive shares	90,298		79,544

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS – continued

NOTE 3. FAIR VALUE MEASUREMENTS

We use fair value measurements when recording and disclosing certain financial assets and liabilities. Debt securities, equity securities, trading assets and derivative financial instruments are recorded at fair value on a recurring basis. Additionally, from time to time, we may be required to record other assets at fair value on a nonrecurring basis, such as loans held for sale, impaired loans, other real estate owned, or OREO, and other repossessed assets, mortgage servicing rights, or MSRs, and certain other assets.

Fair value is the price that would be received to sell an asset or paid to transfer a liability in the principal or most advantageous market in an orderly transaction between market participants at the measurement date. An orderly transaction is a transaction that assumes exposure to the market for a period prior to the measurement date to allow for marketing activities that are usual and customary for transactions involving such assets or liabilities; it is not a forced transaction. In determining fair value, we use various valuation approaches, including market, income and cost approaches. The fair value standard establishes a hierarchy for inputs used in measuring fair value that maximizes the use of observable inputs and minimizes the use of unobservable inputs by requiring that observable inputs be used when available. Observable inputs are inputs that market participants would use in pricing an asset or liability, which are developed based on market data that we have obtained from independent sources. Unobservable inputs reflect our estimates of assumptions that market participants would use in pricing an asset or liability, which are developed based on the best information available in the circumstances.

The fair value hierarchy gives the highest priority to unadjusted quoted market prices in active markets for identical assets or liabilities (Level 1 measurement) and the lowest priority to unobservable inputs (Level 3 measurement). The fair value hierarchy is broken down into three levels based on the reliability of inputs as follows:

Level 1: valuation is based upon unadjusted quoted market prices for identical instruments traded in active markets.

Level 2: valuation is based upon quoted market prices for similar instruments traded in active markets, quoted market prices for identical or similar instruments traded in markets that are not active and model-based valuation techniques for which all significant assumptions are observable in the market or can be corroborated by market data.

Level 3: valuation is derived from other valuation methodologies, including discounted cash flow models and similar techniques that use significant assumptions not observable in the market. These unobservable assumptions reflect estimates of assumptions that market participants would use in determining fair value.

A financial instrument’s level within the fair value hierarchy is based on the lowest level of input that is significant to the fair value measurement. Our policy is to recognize transfers between any of the fair value hierarchy levels at the end of the reporting period in which the transfer occurred.

The following are descriptions of the valuation methodologies that we use for financial instruments recorded at fair value on either a recurring or nonrecurring basis.

Recurring Basis

Debt Securities Available-for-Sale

We obtain fair values for debt securities from a third-party pricing service which utilizes several sources for valuing fixed-income securities. We validate prices received from our pricing service through comparison to a secondary pricing service and broker quotes. We review the methodologies of the pricing service which provides us with a sufficient understanding of the valuation models, assumptions, inputs and pricing to reasonably measure the fair value of our debt securities. The market evaluation sources for debt securities include observable inputs rather than significant unobservable inputs and are classified as Level 2. The service provider utilizes pricing models that vary by asset class and include available trade, bid and other market information. Generally, the methodologies include broker quotes, proprietary models, and vast descriptive terms and conditions databases, and extensive quality control programs.

Equity Securities

Marketable equity securities that have an active, quotable market are classified as Level 1. Marketable equity securities that are quotable, but are thinly traded or inactive, are classified as Level 2. Marketable equity securities that are not readily traded and do not have a quotable market are classified as Level 3.

Trading Assets

We use quoted market prices to determine the fair value of our trading assets. Our trading assets are held in a Rabbi Trust under a deferred compensation plan and are invested in readily quoted mutual funds. Accordingly, these assets are classified as Level 1. Rabbi Trust assets are reported in other assets in the Consolidated Balance Sheets.

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS – continued

NOTE 3. FAIR VALUE MEASUREMENTS – continued

Derivative Financial Instruments

We use derivative instruments, including interest rate swaps for commercial loans with our customers, interest rate lock commitments and the sale of mortgage loans in the secondary market. We calculate the fair value for derivatives using widely accepted valuation techniques, including discounted cash flow analysis on the expected cash flows of each derivative. Each valuation considers the contractual terms of the derivative, including the period to maturity, and uses observable market-based inputs, such as interest rate curves and implied volatilities. Accordingly, derivatives are classified as Level 2. We incorporate credit valuation adjustments into the valuation models to appropriately reflect both our own nonperformance risk and the respective counterparties' nonperformance risk in calculating fair value measurements. In adjusting the fair value of our derivative contracts for the effect of nonperformance risk, we have considered the impact of netting and any applicable credit enhancements and collateral postings.

Nonrecurring Basis

Loans Held for Sale

Loans held for sale consist of 1-4 family residential loans originated for sale in the secondary market and, from time to time, certain loans transferred from the loan portfolio to loans held for sale, all of which are carried at the lower of cost or fair value. The fair value of 1-4 family residential loans is based on the principal or most advantageous market currently offered for similar loans using observable market data. The fair value of the loans transferred from the loan portfolio is based on the amounts offered for these loans in currently pending sales transactions. Loans held for sale carried at fair value are classified as Level 3.

Impaired Loans

Impaired loans are carried at the lower of carrying value or fair value. Fair value is determined as the recorded investment balance less any specific reserve. We establish specific reserves based on the following three impairment methods: 1) the present value of expected future cash flows discounted at the loan’s original effective interest rate; 2) the loan’s observable market price; or 3) the fair value of the collateral less estimated selling costs when the loan is collateral dependent and we expect to liquidate the collateral. However, if repayment is expected to come from the operation of the collateral, rather than liquidation, then we do not consider estimated selling costs in determining the fair value of the collateral. Collateral values are generally based upon appraisals by approved, independent state certified appraisers. Appraisals may be discounted based on our historical knowledge, changes in market conditions from the time of appraisal or our knowledge of the borrower and the borrower’s business. Impaired loans carried at fair value are classified as Level 3.

OREO and Other Repossessed Assets

OREO and other repossessed assets obtained in partial or total satisfaction of a loan are recorded at the lower of recorded investment in the loan or fair value less cost to sell. Subsequent to foreclosure, these assets are carried at the lower of the amount recorded at acquisition date or fair value less cost to sell. Accordingly, it may be necessary to record nonrecurring fair value adjustments. Fair value, when recorded, is generally based upon appraisals by approved, independent state certified appraisers. Like impaired loans, appraisals on OREO may be discounted based on our historical knowledge, changes in market conditions from the time of appraisal or other information available to us. OREO and other repossessed assets carried at fair value are classified as Level 3.

Mortgage Servicing Rights

The fair value of MSRs is determined by calculating the present value of estimated future net servicing cash flows, considering expected mortgage loan prepayment rates, discount rates, servicing costs and other economic factors, which are determined based on current market conditions. The expected rate of mortgage loan prepayments is the most significant factor driving the value of MSRs. MSRs are considered impaired if the carrying value exceeds fair value. The valuation model includes significant unobservable inputs; therefore, MSRs are classified as Level 3. MSRs are reported in other assets in the Consolidated Balance Sheets and are amortized into noninterest income in the Consolidated Statements of Comprehensive Income.

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS – continued

NOTE 3. FAIR VALUE MEASUREMENTS – continued

Other Assets

We measure certain other assets at fair value on a nonrecurring basis. Fair value is based on the application of lower of cost or fair value accounting, or write-downs of individual assets. Valuation methodologies used to measure fair value are consistent with overall principles of fair value accounting and consistent with those described above.

Financial Instruments

In addition to financial instruments recorded at fair value in our financial statements, fair value accounting guidance requires disclosure of the fair value of all of an entity’s assets and liabilities that are considered financial instruments. The majority of our assets and liabilities are considered financial instruments. Many of these instruments lack an available trading market as characterized by a willing buyer and willing seller engaged in an exchange transaction. Also, it is our general practice and intent to hold our financial instruments to maturity and to not engage in trading or sales activities with respect to such financial instruments. For fair value disclosure purposes, we substantially utilize the fair value measurement criteria as required and explained above. In cases where quoted fair values are not available, we use present value methods to determine the fair value of our financial instruments.

Cash and Cash Equivalents

The carrying amounts reported in the Consolidated Balance Sheets for cash and due from banks, including interest-bearing deposits, approximate fair value.

Loans

With the adoption of ASU 2016-01 on January 1, 2018, we refined our methodology to estimate the fair value of our loan portfolio to use the exit price notion as required by the standard. The guidance was applied on a prospective basis resulting in prior-periods no longer being comparable.

The fair value of variable rate loans that may reprice frequently at short-term market rates is based on carrying values adjusted for liquidity and credit risk. The fair value of variable rate loans that reprice at intervals of one year or longer, such as adjustable rate mortgage products, is estimated using discounted cash flow analyses that utilize interest rates currently being offered for similar loans and adjusted for liquidity and credit risk. The fair value of fixed rate loans is estimated using a discounted cash flow analysis that utilizes interest rates currently being offered for similar loans adjusted for liquidity and credit risk.

Bank Owned Life Insurance

Fair value approximates net cash surrender value of bank owned life insurance, or BOLI.

Federal Home Loan Bank, or FHLB, and Other Restricted Stock

It is not practical to determine the fair value of our FHLB and other restricted stock due to the restrictions placed on the transferability of these stocks; it is presented at carrying value.

Deposits

The fair values disclosed for deposits without defined maturities (e.g., noninterest and interest-bearing demand, money market and savings accounts) are by definition equal to the amounts payable on demand. The carrying amounts for variable rate, fixed-term time deposits approximate their fair values. Estimated fair values for fixed rate and other time deposits are based on discounted cash flow analysis using interest rates currently offered for time deposits with similar terms. The carrying amount of accrued interest approximates fair value.

Short-Term Borrowings

The carrying amounts of securities sold under repurchase agreements, or REPOs, and other short-term borrowings approximate their fair values.

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS – continued

NOTE 3. FAIR VALUE MEASUREMENTS – continued

Long-Term Borrowings

The fair values disclosed for fixed rate long-term borrowings are determined by discounting their contractual cash flows using current interest rates for long-term borrowings of similar remaining maturities. The carrying amounts of variable rate long-term borrowings approximate their fair values.

Junior Subordinated Debt Securities

The interest rate on the variable rate junior subordinated debt securities is reset quarterly; therefore, the carrying values approximate their fair values.

Loan Commitments and Standby Letters of Credit

Off-balance sheet financial instruments consist of commitments to extend credit and letters of credit. Except for interest rate lock commitments, estimates of the fair value of these off-balance sheet items are not made because of the short-term nature of these arrangements and the credit standing of the counterparties.

Other

Estimates of fair value are not made for items that are not defined as financial instruments, including such items as our core deposit intangibles and the value of our trust operations.

Assets and Liabilities Recorded at Fair Value on a Recurring Basis

The following tables present our assets and liabilities that are measured at fair value on a recurring basis by fair value hierarchy level at March 31, 2018 and December 31, 2017. There were no transfers between Level 1 and Level 2 for items measured at fair value on a recurring basis during the periods presented.

	March 31, 2018
(dollars in thousands)	Level 1		Level 2		Level 3		Total
ASSETS
Debt securities available-for-sale:
U.S. Treasury securities	$	—	$	14,661	$	—	$	14,661
Obligations of U.S. government corporations and agencies	—		160,589		—		160,589
Collateralized mortgage obligations of U.S. government corporations and agencies	—		102,582		—		102,582
Residential mortgage-backed securities of U.S. government corporations and agencies	—		30,683		—		30,683
Commercial mortgage-backed securities of U.S. government corporations and agencies	—		248,798		—		248,798
Obligations of states and political subdivisions	—		125,141		—		125,141
Total Debt Securities Available-for-Sale	—		682,454		—		682,454
Marketable equity securities(1)	—		5,196		—		5,196
Total Securities	—		687,650		—		687,650
Trading securities held in a Rabbi Trust	5,048		—		—		5,048
Derivative financial assets:
Interest rate swaps	—		4,669		—		4,669
Interest rate lock commitments	—		271		—		271
Total Assets	$	5,048	$	692,590	$	—	$	697,638
LIABILITIES
Derivative financial liabilities:
Interest rate swaps	$	—	$	4,765	$	—	$	4,765
Forward sale contracts	—		24		—		24
Total Liabilities	$	—	$	4,789	$	—	$	4,789

⁽¹⁾ASU 2016-01 was adopted January 1, 2018, resulting in separate classification of our marketable equity securities previously included in available-for-sale securities.

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS – continued

NOTE 3. FAIR VALUE MEASUREMENTS – continued

	December 31, 2017
(dollars in thousands)	Level 1		Level 2		Level 3		Total
ASSETS
Debt securities available-for-sale:
U.S. Treasury securities	$	—	$	19,789	$	—	$	19,789
Obligations of U.S. government corporations and agencies	—		162,193		—		162,193
Collateralized mortgage obligations of U.S. government corporations and agencies	—		108,688		—		108,688
Residential mortgage-backed securities of U.S. government corporations and agencies	—		32,854		—		32,854
Commercial mortgage-backed securities of U.S. government corporations and agencies	—		242,221		—		242,221
Obligations of states and political subdivisions	—		127,402		—		127,402
Marketable equity securities	—		5,144		—		5,144
Total Debt Securities Available-for-Sale	—		698,291		—		698,291
Total Securities	—		698,291		—		698,291
Trading securities held in a Rabbi Trust	5,080		—		—		5,080
Derivative financial assets:
Interest rate swaps	—		3,074		—		3,074
Interest rate lock commitments	—		226		—		226
Total Assets	$	5,080	$	701,591	$	—	$	706,671
LIABILITIES
Derivative financial liabilities:
Interest rate swaps	$	—	$	3,055	$	—	$	3,055
Forward sale contracts	—		5		—		5
Total Liabilities	$	—	$	3,060	$	—	$	3,060

We classify financial instruments as Level 3 when valuation models are used because significant inputs are not observable in the market.     

We may be required to measure certain assets and liabilities at fair value on a nonrecurring basis. Nonrecurring assets are recorded at the lower of cost or fair value in our financial statements. There were no liabilities measured at fair value on a nonrecurring basis at either March 31, 2018 or December 31, 2017.

The following table presents our assets that are measured at fair value on a nonrecurring basis by the fair value hierarchy level as of the dates presented:

	March 31, 2018								December 31, 2017
(dollars in thousands)	Level 1		Level 2		Level 3		Total		Level 1		Level 2		Level 3		Total
ASSETS(1)
Loans held for sale	$	—	$	—	$	—	$	—	$	—	$	—	$	—	$	—
Impaired loans	—		—		6,551		6,551		—		—		6,759		6,759
Other real estate owned	—		—		2,880		2,880		—		—		444		444
Mortgage servicing rights	—		—		106		106		—		—		178		178
Total Assets	$	—	$	—	$	9,537	$	9,537	$	—	$	—	$	7,381	$	7,381
(1)This table presents only the nonrecurring items that are recorded at fair value in our financial statements.

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS – continued

NOTE 3. FAIR VALUE MEASUREMENTS – continued

The carrying values and fair values of our financial instruments at March 31, 2018 and December 31, 2017 are presented in the following tables:

	Carrying Value(1)		Fair Value Measurements at March 31, 2018
(dollars in thousands)			Total		Level 1		Level 2		Level 3
ASSETS
Cash and due from banks, including interest-bearing deposits	$	112,849	$	112,849	$	112,849	$	—	$	—
Securities	687,650		687,650		—		687,650		—
Loans held for sale	3,283		3,377		—		—		3,377
Portfolio loans, net	5,671,567		5,530,443		—		—		5,530,443
Bank owned life insurance	72,629		72,629		—		72,629		—
FHLB and other restricted stock	29,769		29,769		—		—		29,769
Trading securities held in a Rabbi Trust	5,048		5,048		5,048		—		—
Mortgage servicing rights	4,182		5,023		—		—		5,023
Interest rate swaps	4,669		4,669		—		4,669		—
Interest rate lock commitments	271		271		—		271		—
LIABILITIES
Deposits	$	5,387,094	$	5,372,506	$	—	$	—	$	5,372,506
Securities sold under repurchase agreements	44,617		44,617		—		—		44,617
Short-term borrowings	525,000		525,000		—		—		525,000
Long-term borrowings	46,684		46,892		—		—		46,892
Junior subordinated debt securities	45,619		45,619		—		—		45,619
Interest rate swaps	4,765		4,765		—		4,765		—
Interest rate lock commitments	24		24		—		24		—
(1) As reported in the Consolidated Balance Sheets

	Carrying Value(1)		Fair Value Measurements at December 31, 2017
(dollars in thousands)			Total		Level 1		Level 2		Level 3
ASSETS
Cash and due from banks, including interest-bearing deposits	$	117,152	$	117,152	$	117,152	$	—	$	—
Securities	698,291		698,291		—		698,291		—
Loans held for sale	4,485		4,583		—		—		4,583
Portfolio loans, net	5,705,059		5,690,292		—		—		5,690,292
Bank owned life insurance	72,150		72,150		—		72,150		—
FHLB and other restricted stock	29,270		29,270		—		—		29,270
Trading securities held in a Rabbi Trust	5,080		5,080		5,080		—		—
Mortgage servicing rights	4,133		4,571		—		—		4,571
Interest rate swaps	3,074		3,074		—		3,074		—
Interest rate lock commitments	226		226		—		226		—
LIABILITIES
Deposits	$	5,427,891	$	5,426,928	$	—	$	—	$	5,426,928
Securities sold under repurchase agreements	50,161		50,161		—		—		50,161
Short-term borrowings	540,000		540,000		—		—		540,000
Long-term borrowings	47,301		47,618		—		—		47,618
Junior subordinated debt securities	45,619		45,619		—		—		45,619
Interest rate swaps	3,055		3,055		—		3,055		—
Interest rate lock commitments	5		5		—		5		—
(1) As reported in the Consolidated Balance Sheets

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS – continued

NOTE 4. SECURITIES

The following table presents the fair values of our securities portfolio at the dates presented:

(dollars in thousands)	March 31, 2018	December 31, 2017
Debt securities available for sale	682,454	693,147
Marketable equity securities	5,196	5,144
Total Securities	687,650	698,291

Debt Securities Available for Sale

The following tables present the amortized cost and fair value of debt securities available for sale as of March 31, 2018 and debt and equity securities available for sale as of December 31, 2017:

	March 31, 2018									December 31, 2017
(dollars in thousands)	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value		Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
U.S. Treasury securities	$	14,951	$	—	$	(290	)	$	14,661	$	19,943	$	—	$	(154	)	$	19,789
Obligations of U.S. government corporations and agencies	161,844		62		(1,317		)	160,589		162,045		341		(193		)	162,193
Collateralized mortgage obligations of U.S. government corporations and agencies	105,063		2		(2,483		)	102,582		109,916		93		(1,321		)	108,688
Residential mortgage-backed securities of U.S. government corporations and agencies	30,700		443		(460		)	30,683		32,388		679		(213		)	32,854
Commercial mortgage-backed securities of U.S. government corporations and agencies (1)	255,043		—		(6,245		)	248,798		244,018		247		(2,044		)	242,221
Obligations of states and political subdivisions	122,650		2,563		(72		)	125,141		123,159		4,285		(42		)	127,402
Total Debt Securities Available-for-Sale	690,251		3,070		(10,867		)	682,454		691,469		5,645		(3,967		)	693,147
Total equity securities (2)	—		—		—			—		3,815		1,330		(1		)	5,144
Total Securities	$	690,251	$	3,070	$	(10,867	)	$	682,454	$	695,284	$	6,975	$	(3,968	)	$	698,291

⁽¹⁾ Includes a $5.9 million security purchase that was pending settlement as of December 31, 2017.

⁽²⁾ ASU 2016-01 was adopted January 1, 2018, resulting in separate classification of our marketable equity securities previously included in available-for-sale securities.

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S&T BANCORP, INC. AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS – continued

NOTE 4. SECURITIES – continued

The following tables present the fair value and the age of gross unrealized losses on debt securities available for sale by investment category as of the dates presented:

	March 31, 2018
	Less Than 12 Months						12 Months or More						Total
(dollars in thousands)	Number of Securities	Fair Value		Unrealized Losses			Number of Securities	Fair Value		Unrealized Losses			Number of Securities	Fair Value		Unrealized Losses
U.S. Treasury securities	2	$	14,661	$	(290	)	—	$	—	$	—		2	$	14,661	$	(290	)
Obligations of U.S. government corporations and agencies	16	130,823		(1,274		)	1	10,000		(43		)	17	140,823		(1,317		)
Collateralized mortgage obligations of U.S. government corporations and agencies	8	55,695		(800		)	7	43,184		(1,683		)	15	98,879		(2,483		)
Residential mortgage-backed securities of U.S. government corporations and agencies	3	4,861		(106		)	2	7,976		(354		)	5	12,837		(460		)
Commercial mortgage-backed securities of U.S. government corporations and agencies	22	201,051		(4,170		)	5	47,747		(2,075		)	27	248,798		(6,245		)
Obligations of states and political subdivisions	5	23,700		(72		)	—	—		—			5	23,700		(72		)
Total Temporarily Impaired Debt Securities	56	$	430,791	$	(6,712	)	15	$	108,907	$	(4,155	)	71	$	539,698	$	(10,867	)

	December 31, 2017
	Less Than 12 Months						12 Months or More						Total
(dollars in thousands)	Number of Securities	Fair Value		Unrealized Losses			Number of Securities	Fair Value		Unrealized Losses			Number of Securities	Fair Value		Unrealized Losses
U.S. Treasury securities	3	$	19,789	$	(154	)	—	$	—	$	—		3	$	19,789	$	(154	)
Obligations of U.S. government corporations and agencies	9	63,635		(144		)	1	10,017		(49		)	10	73,652		(193		)
Collateralized mortgage obligations of U.S. government corporations and agencies	7	47,465		(248		)	7	45,809		(1,073		)	14	93,274		(1,321		)
Residential mortgage-backed securities of U.S. government corporations and agencies	1	2,333		(10		)	2	8,638		(203		)	3	10,971		(213		)
Commercial mortgage-backed securities of U.S. government corporations and agencies	14	128,300		(775		)	5	48,746		(1,269		)	19	177,046		(2,044		)
Obligations of states and political subdivisions	2	10,330		(42		)	—	—		—			2	10,330		(42		)
Total Temporarily Impaired Debt Securities	36	$	271,852	$	(1,373	)	15	$	113,210	$	(2,594	)	51	$	385,062	$	(3,967	)

We do not believe any individual unrealized loss as of March 31, 2018 represents an other than temporary impairment, or OTTI. At March 31, 2018 there were 71 debt securities and at December 31, 2017 there were 51 debt securities in an unrealized loss position. The unrealized losses on debt securities were primarily attributable to changes in interest rates and not related to the credit quality of these securities. All debt securities are determined to be investment grade and are paying principal and interest according to the contractual terms of the security. We do not intend to sell and it is more likely than not that we will not be required to sell any of the securities in an unrealized loss position before recovery of their amortized cost.

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS – continued

NOTE 4. SECURITIES – continued

The following table presents net unrealized gains and losses, net of tax, on debt securities available-for-sale included in accumulated other comprehensive income/(loss), for the periods presented:

	March 31, 2018									December 31, 2017
(dollars in thousands)	Gross Unrealized Gains			Gross Unrealized Losses			Net Unrealized Gains/ (Losses)			Gross Unrealized Gains			Gross Unrealized Losses			Net Unrealized Gains/ (Losses)
Total unrealized gains(losses) on debt securities available-for-sale	$	3,070		$	(10,867	)	$	(7,797	)	$	5,645		$	(3,967	)	$	1,678
Income tax (expense)benefit	(652		)	2,308			1,656			(1,982		)	1,393			(589		)
Net Unrealized Gains/(losses), Net of Tax Included in Accumulated Other Comprehensive Income/(Loss)	$	2,418		$	(8,559	)	$	(6,141	)	$	3,663		$	(2,574	)	$	1,089

The amortized cost and fair value of debt securities available-for-sale at March 31, 2018 by contractual maturity are included in the table below. Actual maturities may differ from contractual maturities because issuers may have the right to call or prepay obligations with or without call or prepayment penalties.

	March 31, 2018
(dollars in thousands)	Amortized Cost		Fair Value
Obligations of the U.S. Treasury, U.S. government corporations and agencies, and obligations of states and political subdivisions
Due in one year or less	$	43,472	$	43,372
Due after one year through five years	148,616		148,787
Due after five years through ten years	78,565		78,767
Due after ten years	28,792		29,465
	299,445		300,391
Collateralized mortgage obligations of U.S. government corporations and agencies	105,063		102,582
Residential mortgage-backed securities of U.S. government corporations and agencies	30,700		30,683
Commercial mortgage-backed securities of U.S. government corporations and agencies	255,043		248,798
Total Debt Securities Available-for-Sale	$	690,251	$	682,454

At March 31, 2018 and December 31, 2017, debt securities with carrying values of $221 million and $249 million were pledged for various regulatory and legal requirements.

Marketable Equity Securities

The following table presents realized and unrealized net gains and losses for our marketable equity securities for the periods presented:

	Three months ended March 31,
(dollars in thousands)	2018		2017
Marketable Equity Securities
Net gains/losses recognized during the period	$	52	$	733
Less: Net gains/losses recognized for equity securities sold during the period	—		370
Unrealized Gains/Losses Recognized on Equity Securities Still Held	$	52	$	363

Prior to January 1, 2018, net unrealized gains and losses, net of tax, on marketable equity securities were included in AOCI for the periods presented. Net unrealized gains and losses, net of tax on marketable equity securities of $0.9 million were reclassified from AOCI to retained earnings at January 1, 2018.

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS – continued

NOTE 5. LOANS AND LOANS HELD FOR SALE

Loans are presented net of unearned income of $5.1 million and $5.2 million at March 31, 2018 and December 31, 2017.

The following table indicates the composition of loans as of the dates presented:

(dollars in thousands)	March 31, 2018		December 31, 2017
Commercial
Commercial real estate	$	2,760,891	$	2,685,994
Commercial and industrial	1,406,950		1,433,266
Commercial construction	324,141		384,334
Total Commercial Loans	4,491,982		4,503,594
Consumer
Residential mortgage	692,385		698,774
Home equity	474,850		487,326
Installment and other consumer	66,890		67,204
Consumer construction	4,506		4,551
Total Consumer Loans	1,238,631		1,257,855
Total Portfolio Loans	5,730,613		5,761,449
Loans held for sale	3,283		4,485
Total Loans	$	5,733,896	$	5,765,934

We attempt to limit our exposure to credit risk by diversifying our loan portfolio by segment, geography, collateral and industry and actively managing concentrations.When concentrations exist in certain segments, we mitigate this risk by reviewing the relevant economic indicators and internal risk rating trends and through stress testing of the loans in these segments.Total commercial loans represented 78 percent of total portfolio loans at both March 31, 2018 and December 31, 2017. Within our commercial portfolio, the CRE and Commercial Construction portfolios combined comprised $3.1 billion or 69 percent of total commercial loans and 54 percent of total portfolio loans at March 31, 2018 and comprised of $3.1 billion or 68 percent of total commercial loans and 53 percent of total portfolio loans at December 31, 2017. Further segmentation of the CRE and Commercial Construction portfolios by collateral type reveals no concentration in excess of 13 percent of both total CRE and Commercial Construction loans at March 31, 2018 and 14 percent at December 31, 2017.

Our market area includes Pennsylvania and the contiguous states of Ohio, West Virginia, New York and Maryland. The majority of our commercial and consumer loans are made to businesses and individuals in this market area, resulting in a geographic concentration. We believe our knowledge and familiarity with customers and conditions locally outweighs this geographic concentration risk. The conditions of the local and regional economies are monitored closely through publicly available data and information supplied by our customers. Our CRE and Commercial Construction portfolios have out-of-market exposure of 5.0 percent of their combined portfolios and 2.7 percent of total portfolio loans at March 31, 2018. This compares to 5.2 percent of their combined portfolios and 2.8 percent of total portfolio loans at December 31, 2017.

We individually evaluate all substandard commercial loans that have experienced a forbearance or change in terms agreement, and all substandard consumer and residential mortgage loans that entered into an agreement to modify their existing loan, to determine if they should be designated as troubled debt restructurings, or TDRs.

All TDRs are considered to be impaired loans and will be reported as impaired loans for the remaining life of the loan, unless the restructuring agreement specifies an interest rate equal to or greater than the rate that would be accepted at the time of the restructuring for a new loan with comparable risk and it is fully expected that the remaining principal and interest will be collected according to the restructured agreement. Further, all impaired loans are reported as nonaccrual loans unless the loan is a TDR that has met the requirements to be returned to accruing status. TDRs can be returned to accruing status if the ultimate collectability of all contractual amounts due, according to the restructured agreement, is not in doubt and there is a period of a minimum of six months of satisfactory payment performance by the borrower either immediately before or after the restructuring.

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS – continued

NOTE 5. LOANS AND LOANS HELD FOR SALE - continued

The following table summarizes restructured loans as of the dates presented:

	March 31, 2018						December 31, 2017
(dollars in thousands)	Performing TDRs		Nonperforming TDRs		Total TDRs		Performing TDRs		Nonperforming TDRs		Total TDRs
Commercial real estate	$	2,298	$	944	$	3,242	$	2,579	$	967	$	3,546
Commercial and industrial	9,403		3,036		12,439		3,946		3,197		7,143
Commercial construction	2,400		414		2,814		2,420		2,413		4,833
Residential mortgage	2,178		2,640		4,818		2,039		3,585		5,624
Home equity	3,713		1,520		5,233		3,885		979		4,864
Installment and other consumer	43		6		49		32		9		41
Total	$	20,035	$	8,560	$	28,595	$	14,901	$	11,150	$	26,051

There were no TDRs returned to accruing status during the three months ended March 31, 2018 and March 31, 2017.

The following tables present the restructured loans by loan segment and by type of concession for the three months ended March 31, 2018 and 2017:

	Three Months Ended March 31, 2018								Three Months Ended March 31, 2017
(dollars in thousands)	Number of Loans	Pre-Modification Outstanding Recorded Investment(1)		Post-Modification Outstanding Recorded Investment(1)		Total  Difference in Recorded Investment			Number of Loans	Pre-Modification Outstanding Recorded Investment(1)		Post-Modification Outstanding Recorded Investment(1)		Total  Difference in Recorded Investment
Totals by Loan Segment
Commercial real estate
Commercial and industrial
Maturity date extension	2	$	768	$	708	$	(60	)	—	$	—	$	—	$	—
Principal deferral	6	5,355		5,333		(22		)	—	—		—		—
Total Commercial and Industrial	8	6,123		6,041		(82		)	—	—		—		—
Commercial Construction		.
Chapter 7 bankruptcy(2)	2	158		157		(1		)	—	—		—		—
Total Commercial Construction	2	158		157		(1		)	—	—		—		—
Home equity
Chapter 7 bankruptcy(2)	9	578		555		(23		)	6	269		266		(3		)
Maturity date extension and interest rate reduction	—	—		—		—			1	173		172		(1		)
Total Home Equity	9	578		555		(23		)	7	442		438		(4		)
Installment and other consumer
Chapter 7 bankruptcy(2)	2	17		17		—			—	—		—		—
Total Installment and Other Consumer	2	17		17		—			—	—		—		—
Totals by Concession Type
Chapter 7 bankruptcy(2)	13	$	753	$	729	$	(24	)	6	$	269	$	266	$	(3	)
Maturity date extension	2	768		708		(60		)	—	—		—		—
Maturity date extension and interest rate reduction	—	—		—		—			1	173		172		(1		)
Principal deferral	6	5,355		5,333		(22		)	—	—		—		—
Total	21	$	6,876	$	6,770	$	(106	)	7	$	442	$	438	$	(4	)
(1) Excludes loans that were fully paid off or fully charged-off by period end. The pre-modification balance represents the balance outstanding prior to modification. The post-modification balance represents the outstanding balance at period end. (2) Chapter 7 bankruptcy loans where the debt has been legally discharged through the bankruptcy court and not reaffirmed.

As of March 31, 2018, we had no commitments to lend additional funds on TDRs. Defaulted TDRs are defined as loans having a payment default of 90 days or more after the restructuring takes place. There were no TDRs that defaulted during the three months ended March 31, 2018 and 2017 that were restructured within the last 12 months prior to defaulting.

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS – continued

NOTE 5. LOANS AND LOANS HELD FOR SALE - continued

The following table is a summary of nonperforming assets as of the dates presented:

	Nonperforming Assets
(dollars in thousands)	March 31, 2018		December 31, 2017
Nonperforming Assets
Nonaccrual loans	$	12,775	$	12,788
Nonaccrual TDRs	8,560		11,150
Total Nonaccrual Loans	21,335		23,938
OREO	2,920		469
Total Nonperforming Assets	$	24,255	$	24,407

NOTE 6. ALLOWANCE FOR LOAN LOSSES

We maintain an allowance for loan losses, or ALL, at a level determined to be adequate to absorb estimated probable credit losses inherent within the loan portfolio as of the balance sheet date. We develop and document a systematic ALL methodology based on the following portfolio segments: 1) CRE, 2) C&I, 3) Commercial Construction, 4) Consumer Real Estate and 5) Other Consumer.

The following are key risks within each portfolio segment:

CRE—Loans secured by commercial purpose real estate, including both owner-occupied properties and investment properties for various purposes such as hotels, strip malls and apartments. Operations of the individual projects and global cash flows of the debtors are the primary sources of repayment for these loans. The condition of the local economy is an important indicator of risk, but there are also more specific risks depending on the collateral type and the business prospects of the lessee, if the project is not owner-occupied.

C&I—Loans made to operating companies or manufacturers for the purpose of production, operating capacity, accounts receivable, inventory or equipment financing. Cash flow from the operations of the company is the primary source of repayment for these loans. The condition of the local economy is an important indicator of risk, but there are also more specific risks depending on the industry of the company. Collateral for these types of loans often do not have sufficient value in a distressed or liquidation scenario to satisfy the outstanding debt.

Commercial Construction—Loans made to finance construction of buildings or other structures, as well as to finance the acquisition and development of raw land for various purposes. While the risk of these loans is generally confined to the construction period, if there are problems, the project may not be completed, and as such, may not provide sufficient cash flow on its own to service the debt or have sufficient value in a liquidation to cover the outstanding principal. The condition of the local economy is an important indicator of risk, but there are also more specific risks depending on the type of project and the experience and resources of the developer.

Consumer Real Estate—Loans secured by first and second liens such as home equity loans, home equity lines of credit and 1-4 family residential mortgages, including purchase money mortgages. The primary source of repayment for these loans is the income and assets of the borrower. The condition of the local economy, in particular the unemployment rate, is an important indicator of risk for this segment. The state of the local housing market can also have a significant impact on this segment because low demand and/or declining home values can limit the ability of borrowers to sell a property and satisfy the debt.

Other Consumer—Loans made to individuals that may be secured by assets other than 1-4 family residences, as well as unsecured loans. This segment includes auto loans, unsecured loans and lines and credit cards. The primary source of repayment for these loans is the income and assets of the borrower. The condition of the local economy, in particular the unemployment rate, is an important indicator of risk for this segment. The value of the collateral, if there is any, is less likely to be a source of repayment due to less certain collateral values.

We further assess risk within each portfolio segment by pooling loans with similar risk characteristics. For the commercial loan classes, the most important indicator of risk is the internally assigned risk rating, including pass, special mention and substandard. Consumer loans are pooled by type of collateral, lien position and loan to value, or LTV, for Consumer Real Estate loans. Historical loss rates are applied to these loan pools to determine the reserve for loans collectively evaluated for impairment.

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS – continued

NOTE 6. ALLOWANCE FOR LOAN LOSSES – continued

The ALL methodology for groups of loans collectively evaluated for impairment is comprised of both a quantitative and qualitative analysis. A key assumption in the quantitative component of the reserve is the loss emergence period, or LEP. The LEP is an estimate of the average amount of time from the point at which a loss is incurred on a loan to the point at which the loss is confirmed. Another key assumption is the look-back period, or LBP, which represents the historical data period utilized to calculate loss rates.

Management monitors various credit quality indicators for both the commercial and consumer loan portfolios, including delinquency, nonperforming status and changes in risk ratings on a monthly basis.

The following tables present the age analysis of past due loans segregated by class of loans as of the dates presented:

	March 31, 2018
(dollars in thousands)	Current		30-59 Days Past Due		60-89 Days Past Due		Non - performing		Total Past Due Loans		Total Loans
Commercial real estate	$	2,755,336	$	1,162	$	441	$	3,952	$	5,555	$	2,760,891
Commercial and industrial	1,401,154		1,059		120		4,617		5,796		1,406,950
Commercial construction	321,900		368		—		1,873		2,241		324,141
Residential mortgage	682,092		3,125		453		6,715		10,293		692,385
Home equity	468,762		1,603		376		4,109		6,088		474,850
Installment and other consumer	66,551		189		81		69		339		66,890
Consumer construction	4,506		—		—		—		—		4,506
Loans held for sale	3,283		—		—		—		—		3,283
Total	$	5,703,584	$	7,506	$	1,471	$	21,335	$	30,312	$	5,733,896

	December 31, 2017
(dollars in thousands)	Current		30-59 Days Past Due		60-89 Days Past Due		Non - performing		Total Past Due Loans		Total Loans
Commercial real estate	$	2,681,395	$	997	$	134	$	3,468	$	4,599	$	2,685,994
Commercial and industrial	1,426,754		420		446		5,646		6,512		1,433,266
Commercial construction	377,968		2,473		20		3,873		6,366		384,334
Residential mortgage	687,195		2,975		1,439		7,165		11,579		698,774
Home equity	480,956		2,065		590		3,715		6,370		487,326
Installment and other consumer	66,770		193		170		71		434		67,204
Consumer construction	4,551		—		—		—		—		4,551
Loans held for sale	4,485		—		—		—		—		4,485
Total	$	5,730,074	$	9,123	$	2,799	$	23,938	$	35,860	$	5,765,934

We continually monitor the commercial loan portfolio through an internal risk rating system. Loan risk ratings are assigned based upon the creditworthiness of the borrower and are reviewed on an ongoing basis according to our internal policies. Loans within the pass rating generally have a lower risk of loss than loans risk rated as special mention or substandard.

Our risk ratings are consistent with regulatory guidance and are as follows:

Pass—The loan is currently performing and is of high quality.

Special Mention—A special mention loan has potential weaknesses that warrant management’s close attention. If left uncorrected, these potential weaknesses may result in deterioration of the repayment prospects or in the strength of our credit position at some future date. Economic and market conditions, beyond the borrower’s control, may in the future necessitate this classification.

Substandard—A substandard loan is not adequately protected by the net worth and/or paying capacity of the borrower or by the collateral pledged, if any. Substandard loans have a well-defined weakness or weaknesses that jeopardize the liquidation of the debt. These loans are characterized by the distinct possibility that we will sustain some loss if the deficiencies are not corrected.

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS – continued

NOTE 6. ALLOWANCE FOR LOAN LOSSES – continued

The following tables present the recorded investment in commercial loan classes by internally assigned risk ratings as of the dates presented:

	March 31, 2018
(dollars in thousands)	Commercial Real Estate		% of Total		Commercial and Industrial		% of Total		Commercial Construction		% of Total		Total		% of Total
Pass	$	2,625,232	95.1	%	$	1,294,478	92.0	%	$	303,985	93.8	%	$	4,223,695	94.0	%
Special mention	68,204		2.5	%	65,557		4.7	%	14,919		4.6	%	148,680		3.3	%
Substandard	67,455		2.4	%	46,915		3.3	%	5,237		1.6	%	119,607		2.7	%
Total	$	2,760,891	100.0	%	$	1,406,950	100.0	%	$	324,141	100.0	%	$	4,491,982	100.0	%
	December 31, 2017
(dollars in thousands)	Commercial Real Estate		% of Total		Commercial and Industrial		% of Total		Commercial Construction		% of Total		Total		% of Total
Pass	$	2,588,847	96.4	%	$	1,345,810	93.9	%	$	368,105	95.8	%	$	4,302,762	95.5	%
Special mention	66,436		2.5	%	54,320		3.8	%	9,345		2.4	%	130,101		2.9	%
Substandard	30,711		1.1	%	33,136		2.3	%	6,884		1.8	%	70,731		1.6	%
Total	$	2,685,994	100.0	%	$	1,433,266	100.0	%	$	384,334	100.0	%	$	4,503,594	100.0	%

We monitor the delinquent status of the consumer portfolio on a monthly basis. Loans are considered nonperforming when interest and principal are 90 days or more past due or management has determined that a material deterioration in the borrower’s financial condition exists. The risk of loss is generally highest for nonperforming loans.

The following tables present the recorded investment in consumer loan classes by performing and nonperforming status as of the dates presented:

	March 31, 2018
(dollars in thousands)	Residential Mortgage		% of Total		Home Equity		% of Total		Installment and other consumer		% of Total		Consumer Construction		% of Total		Total		% of Total
Performing	$	685,670	99.0	%	$	470,741	99.1	%	$	66,821	99.9	%	$	4,506	100.0	%	$	1,227,738	99.1	%
Nonperforming	6,715		1.0	%	4,109		0.9	%	69		0.1	%	—		—	%	10,893		0.9	%
Total	$	692,385	100.0	%	$	474,850	100.0	%	$	66,890	100.0	%	$	4,506	100.0	%	$	1,238,631	100.0	%
	December 31, 2017
(dollars in thousands)	Residential Mortgage		% of Total		Home Equity		% of Total		Installment and other consumer		% of Total		Consumer Construction		% of Total		Total		% of Total
Performing	$	691,609	99.0	%	$	483,611	99.2	%	$	67,133	99.9	%	$	4,551	100.0	%	$	1,246,904	99.1	%
Nonperforming	7,165		1.0	%	3,715		0.8	%	71		0.1	%	—		—	%	10,951		0.9	%
Total	$	698,774	100.0	%	$	487,326	100.0	%	$	67,204	100.0	%	$	4,551	100.0	%	$	1,257,855	100.0	%

We individually evaluate all substandard and nonaccrual commercial loans greater than $0.5 million for impairment. Loans are considered to be impaired when based upon current information and events it is probable that we will be unable to collect all principal and interest payments due according to the original contractual terms of the loan agreement. All TDRs will be reported as an impaired loan for the remaining life of the loan, unless the restructuring agreement specifies an interest rate equal to or greater than the rate that would be accepted at the time of the restructuring for a new loan with comparable risk and it is expected that the remaining principal and interest will be fully collected according to the restructured agreement. For all TDRs, regardless of size, all other impaired loans, we conduct further analysis to determine the probable loss and assign a specific reserve to the loan if deemed appropriate.

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS – continued

NOTE 6. ALLOWANCE FOR LOAN LOSSES – continued

The following tables summarize investments in loans considered to be impaired and related information on those impaired loans as of the dates presented:

	March 31, 2018						December 31, 2017
(dollars in thousands)	Recorded Investment		Unpaid Principal Balance		Related Allowance		Recorded Investment		Unpaid Principal Balance		Related Allowance
With a related allowance recorded:
Commercial real estate	$	—	$	—	$	—	$	—	$	—	$	—
Commercial and industrial	656		671		537		1,735		1,787		29
Commercial construction	—		—		—		—		—		—
Consumer real estate	—		—		—		21		21		21
Other consumer	39		39		39		27		27		27
Total with a Related Allowance Recorded	695		710		576		1,783		1,835		77
Without a related allowance recorded:
Commercial real estate	3,774		4,034		—		3,546		3,811		—
Commercial and industrial	11,917		13,972		—		5,549		7,980		—
Commercial construction	3,444		4,954		—		5,464		8,132		—
Consumer real estate	10,052		10,987		—		10,467		11,357		—
Other consumer	10		17		—		14		22		—
Total without a Related Allowance Recorded	29,197		33,964		—		25,040		31,302		—
Total:
Commercial real estate	3,774		4,034		—		3,546		3,811		—
Commercial and industrial	12,573		14,643		537		7,284		9,767		29
Commercial construction	3,444		4,954		—		5,464		8,132		—
Consumer real estate	10,052		10,987		—		10,488		11,378		21
Other consumer	49		56		39		41		49		27
Total	$	29,892	$	34,674	$	576	$	26,823	$	33,137	$	77

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S&T BANCORP, INC. AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS – continued

NOTE 6. ALLOWANCE FOR LOAN LOSSES – continued

The following table summarizes average recorded investment in and interest income recognized on loans considered to be impaired for the periods presented:

	Three Months Ended
	March 31, 2018				March 31, 2017
(dollars in thousands)	Average Recorded Investment		Interest Income Recognized		Average Recorded Investment		Interest Income Recognized
With a related allowance recorded:
Commercial real estate	$	—	$	—	$	—	$	—
Commercial and industrial	586		11		10,008		72
Commercial construction	—		—		—		—
Consumer real estate	—		—		26		—
Other consumer	42		1		1		—
Total with a Related Allowance Recorded	628		12		10,035		72
Without a related allowance recorded:
Commercial real estate	3,817		43		8,581		33
Commercial and industrial	6,688		110		11,410		43
Commercial construction	3,446		36		6,239		37
Consumer real estate	10,816		138		11,692		129
Other consumer	12		—		22		—
Total without a Related Allowance Recorded	24,779		327		37,944		242
Total:
Commercial real estate	3,817		43		8,581		33
Commercial and industrial	7,274		121		21,418		115
Commercial construction	3,446		36		6,239		37
Consumer real estate	10,816		138		11,718		129
Other consumer	54		1		23		—
Total	$	25,407	$	339	$	47,979	$	314

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S&T BANCORP, INC. AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS – continued

NOTE 6. ALLOWANCE FOR LOAN LOSSES – continued

The following tables detail activity in the ALL for the periods presented:

	Three Months Ended March 31, 2018
(dollars in thousands)	Commercial Real Estate			Commercial and Industrial			Commercial Construction			Consumer Real Estate			Other Consumer			Total Loans
Balance at beginning of period	$	27,235		$	8,966		$	13,167		$	5,479		$	1,543		$	56,390
Charge-offs	—			(829		)	—			(161		)	(460		)	(1,450		)
Recoveries	49			117			1,129			238			101			1,634
Net (Charge-offs)/ Recoveries	49			(712		)	1,129			77			(359		)	184
Provision for loan losses	3,679			2,218			(3,575		)	(138		)	288			2,472
Balance at End of Period	$	30,963		$	10,472		$	10,721		$	5,418		$	1,472		$	59,046
	Three Months Ended March 31, 2017
(dollars in thousands)	Commercial Real Estate			Commercial and Industrial			Commercial Construction			Consumer Real Estate			Other Consumer			Total Loans
Balance at beginning of period	$	19,976		$	10,810		$	13,999		$	6,095		$	1,895		$	52,775
Charge-offs	(390		)	(715		)	(644		)	(759		)	(434		)	(2,942		)
Recoveries	78			187			256			103			176			800
Net (Charge-offs)/ Recoveries	(312		)	(528		)	(388		)	(656		)	(258		)	(2,142		)
Provision for loan losses	906			2,962			491			517			307			5,183
Balance at End of Period	$	20,570		$	13,244		$	14,102		$	5,956		$	1,944		$	55,816

The following tables present the ALL and recorded investments in loans by category as of the periods presented:

	March 31, 2018
	Allowance for Loan Losses						Portfolio Loans
(dollars in thousands)	Individually Evaluated for Impairment		Collectively Evaluated for Impairment		Total		Individually Evaluated for Impairment		Collectively Evaluated for Impairment		Total
Commercial real estate	$	—	$	30,963	$	30,963	$	3,774	$	2,757,117	$	2,760,891
Commercial and industrial	537		9,935		10,472		12,573		1,394,377		1,406,950
Commercial construction	—		10,721		10,721		3,444		320,697		324,141
Consumer real estate	—		5,418		5,418		10,052		1,161,689		1,171,741
Other consumer	39		1,433		1,472		49		66,841		66,890
Total	$	576	$	58,470	$	59,046	$	29,892	$	5,700,721	$	5,730,613
	December 31, 2017
	Allowance for Loan Losses						Portfolio Loans
(dollars in thousands)	Individually Evaluated for Impairment		Collectively Evaluated for Impairment		Total		Individually Evaluated for Impairment		Collectively Evaluated for Impairment		Total
Commercial real estate	$	—	$	27,235	$	27,235	$	3,546	$	2,682,448	$	2,685,994
Commercial and industrial	29		8,937		8,966		7,284		1,425,982		1,433,266
Commercial construction	—		13,167		13,167		5,464		378,870		384,334
Consumer real estate	21		5,458		5,479		10,488		1,180,163		1,190,651
Other consumer	27		1,516		1,543		41		67,163		67,204
Total	$	77	$	56,313	$	56,390	$	26,823	$	5,734,626	$	5,761,449

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS – continued

NOTE 7. DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES

Interest Rate Swaps

In accordance with applicable accounting guidance for derivatives and hedging, all derivatives are recognized as either assets or liabilities on the balance sheet at fair value. Interest rate swaps are contracts in which a series of interest rate flows (fixed and variable) are exchanged over a prescribed period. The notional amounts on which the interest payments are based are not exchanged. These derivative positions relate to transactions in which we enter into an interest rate swap with a commercial customer while at the same time entering into an offsetting interest rate swap with another financial institution. In connection with each transaction, we agree to pay interest to the customer on a notional amount at a variable interest rate and receive interest from the customer on the same notional amount at a fixed rate. At the same time, we agree to pay another financial institution the same fixed interest rate on the same notional amount and receive the same variable interest rate on the same notional amount. The transaction allows our customer to effectively convert a variable rate loan to a fixed rate loan with us receiving a variable rate. These agreements could have floors or caps on the contracted interest rates.

Pursuant to our agreements with various financial institutions, we may receive collateral or may be required to post collateral based upon mark-to-market positions. Beyond unsecured threshold levels, collateral in the form of cash or securities may be made available to counterparties of interest rate swap transactions. Based upon our current positions and related future collateral requirements relating to them, we believe any effect on our cash flow or liquidity position to be immaterial.

Derivatives contain an element of credit risk, the possibility that we will incur a loss because a counterparty, which may be a financial institution or a customer, fails to meet its contractual obligations. All derivative contracts with financial institutions may be executed only with counterparties approved by our Asset and Liability Committee, or ALCO, and derivatives with customers may only be executed with customers within credit exposure limits approved by our Senior Loan Committee. Interest rate swaps are considered derivatives, but are not accounted for using hedge accounting. As such, changes in the estimated fair value of the derivatives are recorded in current earnings and included in other noninterest income in the Consolidated Statements of Comprehensive Income.

Interest Rate Lock Commitments and Forward Sale Contracts

In the normal course of business, we sell originated mortgage loans into the secondary mortgage loan market. We also offer interest rate lock commitments to potential borrowers. The commitments are generally for a period of 60 days and guarantee a specified interest rate for a loan if underwriting standards are met, but the commitment does not obligate the potential borrower to close on the loan. Accordingly, some commitments expire prior to becoming loans. We may encounter pricing risks if interest rates increase significantly before the loan can be closed and sold. We may utilize forward sale contracts in order to mitigate this pricing risk. Whenever a customer desires these products, a mortgage originator quotes a secondary market rate guaranteed for that day by the investor. The rate lock is executed between the mortgagee and us and in turn a forward sale contract may be executed between us and the investor. Both the rate lock commitment and the corresponding forward sale contract for each customer are considered derivatives, but are not accounted for using hedge accounting. As such, changes in the estimated fair value of the derivatives during the commitment period are recorded in current earnings and included in mortgage banking in the Consolidated Statements of Comprehensive Income.

The following tables indicate the amounts representing the value of derivative assets and derivative liabilities as of the dates presented:

	Derivatives (included in Other Assets)				Derivatives (included in Other Liabilities)
(dollars in thousands)	March 31, 2018		December 31, 2017		March 31, 2018		December 31, 2017
Derivatives not Designated as Hedging Instruments:
Interest Rate Swap Contracts- Commercial Loans
Fair value	$	4,669	$	3,074	$	4,765	$	3,055
Notional amount	253,580		263,841		253,580		263,841
Net collateral received/posted	2,011		—		—		1,448
Interest Rate Lock Commitments- Mortgage Loans
Fair value	271		226		—		—
Notional amount	9,710		6,860		—		—
Forward Sale Contracts- Mortgage Loans
Fair value	—		—		24		5
Notional amount	$	—	$	—	$	9,165	$	6,580

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS – continued

NOTE 7. DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES – continued

Presenting offsetting derivatives that are subject to legally enforceable netting arrangements with the same party is permitted. For example, we may have a derivative asset and a derivative liability with the same counterparty to a swap transaction and are permitted to offset the asset position and the liability position resulting in a net presentation.

The following tables indicate the gross amounts of commercial loan swap derivative assets and derivative liabilities, the amounts offset and the carrying values in the Consolidated Balance Sheets as of the dates presented:

	Derivatives (included in Other Assets)						Derivatives (included in Other Liabilities)
(dollars in thousands)	March 31, 2018			December 31, 2017			March 31, 2018			December 31, 2017
Derivatives not Designated as Hedging Instruments:
Gross amounts recognized	$	5,818		$	4,974		$	5,914		$	4,955
Gross amounts offset	(1,149		)	(1,900		)	(1,149		)	(1,900		)
Net Amounts Presented in the Consolidated Balance Sheets	4,669			3,074			4,765			3,055
Gross amounts not offset(1)	(2,011		)	—			—			(1,448		)
Net Amount	$	2,658		$	3,074		$	4,765		$	1,607

⁽¹⁾ Amounts represent received/posted collateral.

The following tables indicate the gain or loss recognized in income on derivatives for the periods presented:

	Three Months Ended March 31,
(dollars in thousands)	2018			2017
Derivatives not Designated as Hedging Instruments
Interest rate swap contracts—commercial loans	$	115		$	24
Interest rate lock commitments—mortgage loans	45			233
Forward sale contracts—mortgage loans	(19		)	(36		)
Total Derivatives (Loss)/Gain	$	141		$	221

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S&T BANCORP, INC. AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS – continued

NOTE 8. BORROWINGS

Short-term borrowings are for terms under or equal to one year and are comprised of securities sold under repurchase agreements, or REPOs, and Federal Home Loan Bank, or FHLB, advances. All REPOs are overnight short-term investments and are not insured by the Federal Deposit Insurance Corporation. Securities pledged as collateral under these REPO financing arrangements cannot be sold or repledged by the secured party and therefore, the REPOs are accounted for as a secured borrowing. Mortgage-backed securities with a total carrying value of $49.2 million at March 31, 2018 and $56.8 million at December 31, 2017 were pledged as collateral for these secured transactions. The pledged securities are held in safekeeping at the Federal Reserve. Due to the overnight short-term nature of REPOs, potential risk due to a decline in the value of the pledged collateral is low. Collateral pledging requirements with REPOs are monitored daily. FHLB advances are for various terms and are secured by a blanket lien on residential mortgages and other real estate secured loans.

Long-term borrowings are for original terms greater than one year and are comprised of FHLB advances, a capital lease and junior subordinated debt securities. Long-term FHLB advances are secured by the same loans as short-term FHLB advances. We had total long-term borrowings outstanding of $8.5 million at a fixed rate and $38.1 million at a variable rate at March 31, 2018, excluding our capital lease.

Information pertaining to borrowings is summarized in the table below as of the dates presented:

	March 31, 2018				December 31, 2017
(dollars in thousands)	Balance		Weighted Average Rate		Balance		Weighted Average Rate
Short-term Borrowings
Securities sold under repurchase agreements	$	44,617	0.42	%	$	50,161	0.39	%
Short-term borrowings	525,000		1.86	%	540,000		1.47	%
Total Short-term Borrowings	569,617		1.75	%	590,161		1.38	%
Long-term Borrowings
Long-term borrowings	46,684		2.09	%	47,301		1.88	%
Junior subordinated debt securities	45,619		4.58	%	45,619		3.78	%
Total Long-term Borrowings	92,303		3.32	%	92,920		2.81	%
Total Borrowings	$	661,920	1.97	%	$	683,081	1.57	%

We had total borrowings at March 31, 2018 and December 31, 2017 at the FHLB of Pittsburgh of $572 million and $587 million. The $572 million at March 31, 2018 consisted of $525 million in short-term borrowings and $46.7 million in long-term borrowings. Our maximum borrowing capacity with the FHLB of Pittsburgh was $2.5 billion at March 31, 2018. We utilized $709 million of our borrowing capacity at March 31, 2018 consisting of $572 million for borrowings and $137 million for letters of credit to collateralize public funds. Our remaining borrowing availability at March 31, 2018 is $1.8 billion.

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS – continued

NOTE 9. COMMITMENTS AND CONTINGENCIES

Commitments

In the normal course of business, we offer off-balance sheet credit arrangements to enable our customers to meet their financing objectives. These instruments involve, to varying degrees, elements of credit and interest rate risk in excess of the amount recognized in the financial statements. Our exposure to credit loss, in the event the customer does not satisfy the terms of the agreement, equals the contractual amount of the obligation less the value of any collateral. We apply the same credit policies in making commitments and standby letters of credit that are used for the underwriting of loans to customers. Commitments generally have fixed expiration dates, annual renewals or other termination clauses and may require payment of a fee. Because many of the commitments are expected to expire without being drawn upon, the total commitment amounts do not necessarily represent future cash requirements. Our allowance for unfunded commitments totaled $2.1 million at March 31, 2018 and $2.2 million at December 31, 2017. The allowance for unfunded commitments is included in other liabilities in the Consolidated Balance Sheets. The allowance for unfunded commitments is determined using a similar methodology as our ALL methodology. The reserve is calculated by applying historical loss rates and qualitative adjustments to our unfunded commitments.

Estimates of the fair value of these off-balance sheet items were not made because of the short-term nature of these arrangements and the credit standing of the counterparties.

The following table sets forth our commitments and letters of credit as of the dates presented:

(dollars in thousands)	March 31, 2018		December 31, 2017
Commitments to extend credit	$	1,454,312	$	1,420,428
Standby letters of credit	78,985		80,918
Total	$	1,533,297	$	1,501,346

Litigation

In the normal course of business, we are subject to various legal and administrative proceedings and claims. While any type of litigation contains a level of uncertainty, we believe that the outcome of such proceedings or claims pending will not have a material adverse effect on our consolidated financial position or results of operations.

NOTE 10. OTHER COMPREHENSIVE INCOME

The following tables present the change in components of other comprehensive income (loss) for the periods presented, net of tax effects.

	Three Months Ended March 31, 2018									Three months ended March 31, 2017
(dollars in thousands)	Pre-Tax Amount			Tax (Expense) Benefit			Net of Tax Amount			Pre-Tax Amount			Tax (Expense) Benefit			Net of Tax Amount
Change in net unrealized gains/(losses) on debt securities available-for-sale (2)	$	(9,474	)	$	2,012		$	(7,462	)	$	1,662		$	(584	)	$	1,078
Reclassification adjustment for net (gains)/losses on debt securities available-for-sale included in net income (1)	—			—			—			(370		)	130			(240		)
Adjustment to funded status of employee benefit plans	621			(132		)	489			539			(189		)	350
Other Comprehensive Income/(Loss)	$	(8,853	)	$	1,880		$	(6,973	)	$	1,831		$	(643	)	$	1,188
(1) Reclassification adjustments are comprised of realized security gains or losses. The realized gains or losses have been reclassified out of accumulated other comprehensive income/(loss) and have affected certain lines in the Consolidated Statements of Comprehensive Income as follows; the pre-tax amount is included in securities gains/losses-net, the tax expense amount is included in the provision for income taxes and the net of tax amount is included in net income.
(2) Due to the adoption of ASU 2016-01, net unrealized gains on marketable equity securities were reclassified from Accumulated Other Comprehensive Income to Retained Earnings during the three months ended March 31, 2018. The prior period data was not restated; as such, the change in unrealized gains on marketable securities is combined with the change in net unrealized gains on debit securities for the period ended March 31, 2017.

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS – continued

NOTE 11. EMPLOYEE BENEFITS

Our qualified and nonqualified defined benefit plans were amended to freeze benefit accruals for all persons entitled to benefits under the plan in 2016. We will continue recording pension expense related to these plans, primarily representing interest costs on the accumulated benefit obligation and amortization of actuarial losses accumulated in the plan, as well as income from expected investment returns on pension assets. The expected long-term rate of return on plan assets is 7.50 percent.

The following table summarizes the components of net periodic pension cost for the periods presented:

	Three Months Ended March 31,
(dollars in thousands)	2018			2017
Components of Net Periodic Pension Cost
Service cost—benefits earned during the period	$	—		$	—
Interest cost on projected benefit obligation	967			1,025
Expected return on plan assets	(1,567		)	(1,582		)
Amortization of prior service credit	544			474
Recognized net actuarial loss	—			—
Net Periodic Pension Expense	$	(56	)	$	(83	)

NOTE 12. QUALIFIED AFFORDABLE HOUSING PROJECTS

We invest in affordable housing projects primarily to satisfy our Community Reinvestment Act requirements. As a limited partner in these operating partnerships, we receive tax credits and tax deductions for losses incurred by the underlying properties. We use the cost method to account for these partnerships. Our total investment in qualified affordable housing projects was $8.0 million at March 31, 2018 and $8.7 million at December 31, 2017. Amortization expense, included in other noninterest expense in the Consolidated Statements of Comprehensive Income, was $0.7 million for the three months ended March 31, 2018 and $0.8 million for the three months ended March 31, 2017. The amortization expense was offset by tax credits of $0.8 million for the three months ended March 31, 2018 and $0.9 million for the three months ended March 31, 2017, a reduction to our federal tax provision.

NOTE 13. SALE OF A MAJORITY INTEREST OF INSURANCE BUSINESS

On November 9, 2017, we entered into an asset purchase agreement to sell a 70 percent ownership interest in the assets of our subsidiary, S&T Evergreen Insurance, LLC. The partial sale was accounted for as the sale of a business. At the date of the sale, January 1, 2018, we ceased to have a controlling financial interest, deconsolidated the subsidiary and recognized a gain of $1.9 million. We transferred our 30 percent share of net assets from S&T Evergreen Insurance, LLC to the new entity for a 30 percent partnership interest in a new insurance entity. We will use the equity-method of accounting to recognize changes in the value of our investment in the new insurance entity for our proportional share of income and losses of the new insurance entity.

NOTE 14. SHARE REPURCHASE PLAN

On March 19, 2018, our Board of Directors authorized a $50 million share repurchase plan. This repurchase authorization, which is effective through August 31, 2019, permits us to repurchase from time to time up to $50 million in aggregate value of shares of our common stock through a combination of open market and privately negotiated repurchases. The specific timing, price and quantity of repurchases will be at our discretion and will depend on a variety of factors, including general market conditions, the trading price of the common stock, legal and contractual requirements and our financial performance. The repurchase plan does not obligate us to repurchase any particular number of shares. We expect to fund any repurchases from cash on hand and internally generated funds.

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Item 2. MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

Management’s Discussion and Analysis of Financial Condition and Results of Operations, or MD&A, represents an overview of our consolidated results of operations and financial condition and highlights material changes in our financial condition and results of operations at and for the three month periods ended March 31, 2018 and 2017. Our MD&A should be read in conjunction with our Consolidated Financial Statements and notes. The results of operations reported in the accompanying Consolidated Financial Statements are not necessarily indicative of results to be expected in future periods.

Important Note Regarding Forward-Looking Statements

This quarterly report on Form 10-Q contains or incorporates statements that we believe are “forward-looking statements” within the meaning of the Private Securities Litigation Reform Act of 1995. Forward-looking statements generally relate to our financial condition, results of operations, plans, objectives, outlook for earnings, revenues, expenses, capital and liquidity levels and ratios, asset levels, asset quality, financial position, and other matters regarding or affecting S&T and its future business and operations. Forward looking statements are typically identified by words or phrases such as “will likely result”, “expect”, “anticipate”, “estimate”, “forecast”, “project”, “intend”, “ believe”, “assume”, “strategy”, “trend”, “plan”, “outlook”, “outcome”, “continue”, “remain”, “potential”, “opportunity”, “believe”, “comfortable”, “current”, “position”, “maintain”, “sustain”, “seek”, “achieve” and variations of such words and similar expressions, or future or conditional verbs such as will, would, should, could or may. Although we believe the assumptions upon which these forward-looking statements are based are reasonable, any of these assumptions could prove to be inaccurate and the forward-looking statements based on these assumptions could be incorrect. The matters discussed in these forward-looking statements are subject to various risks, uncertainties and other factors that could cause actual results and trends to differ materially from those made, projected, or implied in or by the forward-looking statements depending on a variety of uncertainties or other factors including, but not limited to: credit losses; cyber-security concerns; rapid technological developments and changes; sensitivity to the interest rate environment including a prolonged period of low interest rates, a rapid increase in interest rates or a change in the shape of the yield curve; a change in spreads on interest-earning assets and interest-bearing liabilities; regulatory supervision and oversight; legislation affecting the financial services industry as a whole, and S&T, in particular; the outcome of pending and future litigation and governmental proceedings; increasing price and product/service competition; the ability to continue to introduce competitive new products and services on a timely, cost-effective basis; managing our internal growth and acquisitions; the possibility that the anticipated benefits from acquisitions cannot be fully realized in a timely manner or at all, or that integrating the acquired operations will be more difficult, disruptive or costly than anticipated; containing costs and expenses; reliance on significant customer relationships; general economic or business conditions; deterioration of the housing market and reduced demand for mortgages; deterioration in the overall macroeconomic conditions or the state of the banking industry that could warrant further analysis of the carrying value of goodwill and could result in an adjustment to its carrying value resulting in a non-cash charge to net income; re-emergence of turbulence in significant portions of the global financial and real estate markets that could impact our performance, both directly, by affecting our revenues and the value of our assets and liabilities and indirectly, by affecting the economy generally and access to capital in the amounts, at the times and on the terms required to support our future businesses. Many of these factors, as well as other factors, are described in our Annual Report on Form 10-K for the year ended December 31, 2017, including Part I, Item 1A, Risk Factors and any of our subsequent filings with the SEC. Forward-looking statements are based on beliefs and assumptions using information available at the time the statements are made. We caution you not to unduly rely on forward-looking statements because the assumptions, beliefs, expectations and projections about future events may and often do, differ materially from actual results. Any forward-looking statement speaks only as to the date on which it is made and we undertake no obligation to update any forward-looking statement to reflect developments occurring after the statement is made.

Critical Accounting Policies and Estimates

Our critical accounting policies involving significant judgments and assumptions used in the preparation of the Consolidated Financial Statements as of March 31, 2018 have remained unchanged from the disclosures presented in our Annual Report on Form 10-K for the year ended December 31, 2017 under the section “Management’s Discussion and Analysis of Financial Condition and Results of Operations.”

Overview

We are a bank holding company headquartered in Indiana, Pennsylvania with assets of $7.0 billion at March 31, 2018.  We operate bank branches in Pennsylvania and Ohio and loan production offices in Pennsylvania, Ohio and New York. We provide

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a full range of financial services with retail and commercial banking products, cash management services and trust and brokerage services. Our common stock trades on the NASDAQ Global Select Market under the symbol “STBA.”

We earn revenue primarily from interest on loans and securities and fees charged for financial services provided to our customers. We incur expenses for the cost of deposits and other funding sources, provision for loan losses and other operating costs such as salaries and employee benefits, data processing, occupancy and tax expense.

Our mission is to become the financial services provider of choice within the markets that we serve. We strive to do this by delivering exceptional service and value, one customer at a time. Our strategic plan focuses on organic growth, which includes both growth within our current footprint and growth through market expansion. We also actively evaluate acquisition opportunities as another source of growth. Our strategic plan includes a collaborative model that combines expertise from all areas of our business and focuses on satisfying each customer’s individual financial objectives.

Our focus continues to be on organic loan and deposit growth and implementing opportunities to increase fee income while closely managing our operating expenses and asset quality. We are focused on executing our strategy to successfully build our brand and grow our business in all of our markets. We have benefited from recent increases in short-term interest rates and expect to benefit from any future increases. Our performance has also benefited from the Tax Cuts and Jobs Act (Tax Act) which lowered the federal corporate tax rate from 35 percent to 21 percent effective January 1, 2018.

Earnings Summary

Net income increased $8.0 million, or 43.8 percent, for the three months ended March 31, 2018 compared to the same period in 2017. Net income for the three months ended March 31, 2018 was $26.2 million, or $0.75 diluted earnings per share, as compared to net income of $18.2 million, or $0.52 diluted earnings per share, for the same period in 2017. The increase in net income was due to increases in net interest income of $3.1 million and noninterest income of $0.8 million and decreases in provision for loan losses of $2.7 million, noninterest expense of $0.7 million and income taxes of $0.7 million.

Net interest income increased $3.1 million, or 5.7 percent, to $57.0 million for the three months ended March 31, 2018 compared to $53.9 million for the same period in 2017. The increases in short-term interest rates over the past year positively impacted both net interest income and net interest margin. Average interest-earning assets increased $74.1 million and average interest-bearing liabilities decreased $61.6 million, for the three months ended 2018 compared to the same period in 2017. The increase in average interest-earning assets primarily related to organic growth with average loans increasing $96.1 million for the first three months of the 2018. This growth was in our commercial loan portfolio. The decrease in average interest-bearing liabilities was mainly due to declines in both interest-bearing deposits and borrowings. Average interest-bearing deposits decreased $17.3 million and average borrowings decreased $44.3 million for the three months ended 2018 compared to the same period in 2017. Net interest margin, on a fully taxable-equivalent, or FTE, basis (non-GAAP), increased nine basis points to 3.59 percent in the three months ended 2018 compared to 3.50 percent for the same period in 2017.

The provision for loan losses decreased $2.7 million to $2.5 million for the three months ended March 31, 2018 compared to $5.2 million for the same period in 2017. For the three months ended March 31, 2018, we had net recoveries of $0.2 million compared to $2.1 million of charge-offs for the same period in 2017. Annualized net loan charge-offs to average loans was negative 0.01 percent for the first quarter 2018 compared to 0.15 percent for the same period in 2017. Specific reserves on impaired loans decreased $3.0 million to $0.6 million at March 31, 2018 compared to $3.6 million at March 31, 2017. Nonperforming loans decreased $24.7 million to $21.3 million compared to $46.0 million for the same periods in 2017.

Noninterest income increased $0.8 million to $13.8 million for the three months ended March 31, 2018 compared to $13.0 million for the same period in 2017. The increase in noninterest income was primarily due to a $1.9 million gain on the sale of a majority interest of our insurance business offset by $1.3 million decrease in insurance fees related to that sale.

Noninterest expense decreased $0.7 million to $36.1 million for the three months ended March 31, 2018 compared to $36.8 million for the same period in 2017. The decrease in noninterest expense was primarily due to a $1.7 million decrease in salaries and employee benefits expense offset by a $0.9 million increase in other taxes. The decrease in salaries and employee benefits is due to lower restricted stock, incentive and commission costs and fewer employees due to the sale of a branch in the fourth quarter of 2017 and the sale of our insurance business in the first quarter of 2018. The increase in other taxes primarily related to a state sales tax assessment.

The provision for income taxes decreased $0.7 million to $6.0 million for the three months ended March 31, 2018 compared to the same period in 2017. The decrease was primarily due to the Tax Act which lowered the federal corporate tax rate from 35 percent to 21 percent effective January 1, 2018. As a result our effective tax rate declined to 18.7 percent for the three months ended March 31, 2018 compared to 26.9 percent for the same period in 2017. Included in the effective tax rate for the three months ended 2018 were non-recurring discrete tax expense items of $0.9 million, primarily related to the sale of a majority interest of our insurance business.

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Explanation of Use of Non-GAAP Financial Measures

In addition to the results of operations presented in accordance with generally accepted accounting principles, or GAAP, in the United States, management uses, and this quarterly report references, net interest income on a fully taxable equivalent, or FTE, basis, which is a non-GAAP financial measure. Management believes this measure provides information useful to investors in understanding our underlying business, operational performance and performance trends as it facilitates comparisons with the performance of other companies in the financial services industry. Although management believes that this non-GAAP financial measure enhances investors’ understanding of our business and performance, this non-GAAP financial measure should not be considered an alternative to GAAP or considered to be more important than financial results determined in accordance with GAAP, nor is it necessarily comparable with non-GAAP measures which may be presented by other companies.

We believe the presentation of net interest income on an FTE basis ensures the comparability of net interest income arising from both taxable and tax-exempt sources and is consistent with industry practice. Interest income per the Consolidated Statements of Comprehensive Income is reconciled to net interest income adjusted to an FTE basis in the Net Interest Income section of the "Results of Operations - Three Months Ended March 31, 2018 Compared to Three Months Ended March 31, 2017."

RESULTS OF OPERATIONS

Three Months Ended March 31, 2018 Compared to

Three Months Ended March 31, 2017

Net Interest Income

Our principal source of revenue is net interest income. Net interest income represents the difference between the interest and fees earned on interest-earning assets and the interest paid on interest-bearing liabilities. Net interest income is affected by changes in the average balance of interest-earning assets and interest-bearing liabilities and changes in interest rates and spreads. The level and mix of interest-earning assets and interest-bearing liabilities is managed by our Asset and Liability Committee, or ALCO, in order to mitigate interest rate and liquidity risks of the balance sheet. A variety of ALCO strategies were implemented, within prescribed ALCO risk parameters, to produce what we believe is an acceptable level of net interest income.

The interest income on interest-earning assets and the net interest margin are presented on an FTE basis. The FTE basis adjusts for the tax benefit of income on certain tax-exempt loans and securities using the federal statutory tax rate of 21 percent for the three months ended March 31, 2018 and the federal statutory tax rate of 35 percent for the three months ended March 31, 2017 and the dividend-received deduction for equity securities. We believe this to be the preferred industry measurement of net interest income that provides a relevant comparison between taxable and non-taxable sources of interest income.

The following table reconciles interest income per the Consolidated Statements of Comprehensive Income to net interest income and rates on an FTE basis for the periods presented:

	Three months ended March 31,
(dollars in thousands)	2018			2017
Total interest income	$	68,029		$	61,150
Total interest expense	11,097			7,272
Net Interest Income per Consolidated Statements of Comprehensive Income	56,932			53,878
Adjustment to FTE basis	940			1,871
Net Interest Income on an FTE Basis (Non-GAAP)	$	57,872		$	55,749
Net interest margin	3.53		%	3.38		%
Adjustment to FTE basis	0.06		%	0.12		%
Net Interest Margin on an FTE Basis (Non-GAAP)	3.59		%	3.50		%

Income amounts are annualized for rate calculations.

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Average Balance Sheet and Net Interest Income Analysis (FTE)

The following table provides information regarding the average balances, interest and rates earned on interest-earning assets and the average balances, interest and rates paid on interest-bearing liabilities for the periods presented:

	Three months ended March 31, 2018						Three months ended March 31, 2017
(dollars in thousands)	Average Balance		Interest		Rate		Average Balance		Interest		Rate
ASSETS
Interest-bearing deposits with banks	$	56,008	$	230	1.65	%	$	66,173	$	140	0.85	%
Securities, at fair value(2)	686,912		4,353		2.53	%	697,327		4,260		2.44	%
Loans held for sale	1,949		28		5.65	%	2,211		25		4.44	%
Commercial real estate	2,690,990		30,307		4.57	%	2,524,859		26,462		4.25	%
Commercial and industrial	1,431,588		15,560		4.41	%	1,413,801		14,491		4.16	%
Commercial construction	375,129		4,176		4.51	%	454,886		4,155		3.70	%
Total Commercial Loans	4,497,707		50,043		4.51	%	4,393,546		45,108		4.16	%
Residential mortgage	694,303		7,241		4.19	%	699,849		7,060		4.05	%
Home equity	481,053		5,299		4.47	%	480,411		4,905		4.14	%
Installment and other consumer	66,861		1,103		6.69	%	68,164		1,091		6.49	%
Consumer construction	3,810		44		4.69	%	5,374		49		3.67	%
Total Consumer Loans	1,246,027		13,687		4.43	%	1,253,798		13,105		4.22	%
Total Portfolio Loans	5,743,734		63,730		4.50	%	5,647,344		58,213		4.18	%
Total Loans(1)(2)	5,745,683		63,758		4.50	%	5,649,555		58,238		4.18	%
Federal Home Loan Bank and other restricted stock	31,216		628		8.05	%	32,690		383		4.68	%
Total Interest-earning Assets	6,519,819		68,969		4.28	%	6,445,745		63,021		3.96	%
Noninterest-earning assets	488,808						511,125
Total Assets	$	7,008,627					$	6,956,870
LIABILITIES AND SHAREHOLDERS’ EQUITY
Interest-bearing demand	$	575,377	$	368	0.26	%	$	633,232	$	275	0.18	%
Money market	1,194,053		3,232		1.10	%	938,014		1,406		0.61	%
Savings	874,318		437		0.20	%	1,041,647		536		0.21	%
Certificates of deposit	1,355,617		3,808		1.14	%	1,403,796		3,162		0.91	%
Total Interest-bearing Deposits	3,999,365		7,845		0.80	%	4,016,689		5,379		0.54	%
Securities sold under repurchase agreements	47,774		46		0.39	%	48,896		1		0.01	%
Short-term borrowings	596,014		2,508		1.71	%	671,784		1,399		0.84	%
Long-term borrowings	46,938		232		1.99	%	14,362		105		2.91	%
Junior subordinated debt securities	45,619		466		4.14	%	45,619		388		3.45	%
Total Borrowings	736,345		3,252		1.79	%	780,661		1,893		0.98	%
Total Interest-bearing Liabilities	4,735,710		11,097		0.95	%	4,797,350		7,272		0.61	%
Noninterest-bearing liabilities:
Noninterest-bearing liabilities	1,383,109						1,309,401
Shareholders’ equity	889,808						850,119
Total Liabilities and Shareholders’ Equity	$	7,008,627					$	6,956,870
Net Interest Income(2)(3)			$	57,872					$	55,749
Net Interest Margin(2) (3)					3.59	%					3.50	%

⁽¹⁾ Nonaccruing loans are included in the daily average loan amounts outstanding.

⁽²⁾ Tax-exempt income is on an FTE basis using the statutory federal corporate income tax rate of 21 percent for 2018 and 35 percent for 2017

⁽³⁾ Taxable investment income is adjusted for the dividend-received deduction for equity securities.

Net interest income on an FTE basis increased $2.1 million, or 3.8 percent, for the three months ended March 31, 2018 compared to the same period in 2017. The net interest margin on an FTE basis increased nine basis points to 3.59 percent for the three months ended March 31, 2018 compared to 3.50 percent for the same period in 2017. The increases were primarily

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due to higher short-term rates, offset by the impact of the statutory federal corporate income tax rate decrease, which negatively impacts the March 31, 2018 net interest margin on an FTE basis by 6 basis points.

Interest income on a FTE basis increased $5.9 million, or 9.4 percent, for the three months ended March 31, 2018 compared to the same period in 2017. The increase is primarily due an increase in average interest-earning assets of $74.1 million and higher short-term interest rates. Average loan balances increased $96.1 million due to organic loan growth, primarily in the commercial loan portfolio. The average rate earned on loans increased 32 basis points primarily due to higher short-term interest rates. Average interest-bearing deposits with banks, which is primarily cash at the Federal Reserve, decreased $10.2 million and the average rate earned increased 80 basis points due to higher short-term interest rates. Average securities decreased $10.4 million with no significant change to the rate. The average rate earned on the Federal Home Loan Bank (FHLB) and other restricted stock improved due an increase in the quarterly dividend rate from the FHLB. Overall, the FTE rate on interest-earning assets increased 32 basis points compared to the same period in 2017.

Interest expense increased $3.8 million for the three months ended March 31, 2018 compared to the same period in 2017. The increase is primarily due to higher short-term interest rates. Average interest-bearing deposits decreased $17.3 million. Average money market balances increased $256 million and the average rate paid increased 49 basis points due to higher short-term interest rates. The money market balance increase is partially attributable to a shift in deposit mix, as average interest-bearing demand, savings, and certificates of deposit balances declined. The overall decline in average interest-bearing liabilities is favorably offset by increased average noninterest-bearing demand deposit balances of $73.7 million. Average total borrowings decreased $44.3 million due to the overall increase in average deposit balances. Short-term borrowings decreased $75.8 million and the average rate paid increased 87 basis points due to higher short-term interest rates. Long-term borrowings increased $32.6 million and the average rate paid decreased 92 basis points due to the addition of a longer term variable rate borrowing. Overall, the cost of interest-bearing liabilities increased 34 basis points compared to same period in 2017.

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The following table sets forth for the periods presented a summary of the changes in interest earned and interest paid resulting from changes in volume and changes in rates:

	Three Months Ended March 31, 2018 compared to March 31, 2017
(dollars in thousands)	Volume (4)			Rate (4)			Total
Interest earned on:
Interest-bearing deposits with banks	$	(22	)	$	112		$	90
Securities, at fair value(2)(3)	(64		)	157			93
Loans held for sale	(3		)	6			3
Commercial real estate	1,741			2,104			3,845
Commercial and industrial	182			887			1,069
Commercial construction	(729		)	750			21
Total Commercial Loans	1,195			3,740			4,935
Residential mortgage	(56		)	237			181
Home equity	7			387			394
Installment and other consumer	(21		)	33			12
Consumer construction	(14		)	9			(5		)
Total Consumer Loans	(85		)	667			582
Total Portfolio Loans	1,110			4,407			5,517
Total Loans(1)(2)	1,107			4,413			5,520
Federal Home Loan Bank and other restricted stock	(17		)	262			245
Change in Interest Earned on Interest-earning Assets	$	1,005		$	4,943		$	5,948
Interest paid on:
Interest-bearing demand	$	(25	)	$	118		$	93
Money market	384			1,442			1,826
Savings	(86		)	(13		)	(99		)
Certificates of deposit	(109		)	755			646
Total Interest-bearing Deposits	164			2,302			2,466
Securities sold under repurchase agreements	—			45			45
Short-term borrowings	(158		)	1,267			1,109
Long-term borrowings	238			(111		)	127
Junior subordinated debt securities	—			78			78
Total Borrowings	80			1,279			1,359
Change in Interest Paid on Interest-bearing Liabilities	244			3,581			3,825
Change in Net Interest Income	$	761		$	1,362		$	2,123

⁽¹⁾ Nonaccruing loans are included in the daily average loan amounts outstanding.

⁽²⁾ Tax-exempt income is on an FTE basis using the statutory federal corporate income tax rate of 21 percent for 2018 and 35 percent for 2017.

⁽³⁾ Taxable investment income is adjusted for the dividend-received deduction for equity securities.

⁽⁴⁾ Changes to rate/volume are allocated to both rate and volume on a proportionate dollar basis.

Provision for Loan Losses

The provision for loan losses is the amount to be added to the allowance for loan losses, or ALL, after considering loan charge-offs and recoveries to bring the ALL to a level determined to be appropriate in management's judgment to absorb probable losses inherent in the loan portfolio. The provision for loan losses decreased $2.7 million to $2.5 million for the three months ended March 31, 2018 compared to $5.2 million for the same period in 2017. The lower provision for loan losses was mainly due to a decrease in loan charge-offs and lower specific reserves compared to the same period in the prior year. For the three months ended March 31, 2018, there was a net recovery of $0.2 million compared to net charge-offs of $2.1 million for the same period in 2017. The net recovery was due to a $1.0 million recovery of a commercial construction loan during the three months ended March 31, 2018. Annualized net loan charge-offs to average loans were a negative 0.01 percent compared to 0.15 percent for the three months ended March 31, 2017. Impaired loans decreased $16.9 million to $29.9 million and specific reserves on impaired loans decreased $3.0 million compared to the same period in the prior year.

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The ALL at March 31, 2018 was $59.0 million compared to $55.8 million at March 31, 2017. The ALL as a percent of total portfolio loans was 1.03 percent at March 31, 2018 and 0.97 percent at March 31, 2017. Refer to “Financial Condition - Allowance for Loan Losses” in this MD&A for additional information.

Noninterest Income

	Three Months Ended March 31,
(dollars in thousands)	2018		2017		$ Change			% Change
Net gain (loss) on sale of securities	$	—	$	370	$	(370	)	—	%
Service charges on deposit accounts	3,241		3,014		227			7.5
Debit and credit card	3,037		2,843		194			6.8
Wealth management	2,682		2,403		279			11.6
Gain on sale of a majority interest of insurance business	1,873		—		1,873			—
Mortgage banking	602		733		(131		)	(17.9	)
Insurance	169		1,457		(1,288		)	(88.4	)
Other	2,188		2,176		12			0.6
Total Noninterest Income	$	13,792	$	12,996	$	796		6.1	%
NM- Not meaningful

Noninterest income increased $0.8 million, or 6.1 percent, to $13.8 million for the three months ended March 31, 2018 compared to the same period in 2017. The increase in noninterest income primarily related to a $1.9 million gain on the sale of a majority interest in S&T Evergreen Insurance, LLC, which occurred in the first quarter of 2018. This increase was offset in part by a decrease of $1.3 in insurance fees related primarily to the sale. The $0.2 million increase in debit and credit card fees is related to increased debit card usage. Wealth management fees increased $0.3 million due to improvement in market conditions. Service charges on deposit accounts increased $0.2 million due to program changes. These increases were offset by decreases in securities gains of $0.4 million related to the sale of an equity security in the first quarter of 2017.

Noninterest Expense

	Three Months Ended March 31,
(dollars in thousands)	2018		2017		$ Change			% Change
Salaries and employee benefits	$	18,815	$	20,541	$	(1,726	)	(8.4	)%
Net occupancy	2,873		2,815		58			2.1
Data processing	2,325		2,223		102			4.6
Furniture, equipment and software	1,957		2,047		(90		)	(4.4	)
Other taxes	1,848		976		872			89.3
FDIC insurance	1,108		1,123		(15		)	(1.3	)
Professional services and legal	1,051		1,068		(17		)	(1.6	)
Marketing	702		754		(52		)	(6.9	)
Other	5,403		5,261		142			2.7
Total Noninterest Expense	$	36,082	$	36,808	$	(726	)	(2.0	)%

NM - not meaningful

Noninterest expense decreased $0.7 million, or 2.0 percent, to $36.1 million for the three months ended March 31, 2018 compared to the same period in 2017. Salaries and employee benefits expense decreased $1.7 million due to lower restricted stock, incentive and commission costs and fewer employees due to the sale of a branch in the fourth quarter of 2017 and the sale of our insurance business in the first quarter 2018. This decrease was offset by an increase in other taxes of $0.8 million due to a state sales tax assessment.

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Provision for Income Taxes

The provision for income taxes decreased $0.7 million for the three months ended March 31, 2018 compared to the same period in 2017. The decrease was primarily due to the Tax Act which lowered the federal corporate tax rate from 35 percent to 21 percent effective January 1, 2018. As a result, our effective tax rate declined to 18.7 percent for the three months ended March 31, 2018 compared to 26.9 percent in the same period of the prior year. Included in the effective tax rate for the three months ended 2018 were non-recurring discrete tax expense items of $0.9 million, primarily related to the sale of a majority interest of our insurance business.

Financial Condition

March 31, 2018

Total assets were relatively unchanged at $7.0 billion at March 31, 2018 compared to December 31, 2017. Total portfolio loans decreased slightly to $5.7 billion with decreases in all categories except the Commercial Real Estate, or CRE portfolio. Higher than usual historical pay-offs in commercial loans combined with lower seasonal demand resulted in this decrease of $30.8 million. Securities decreased $10.6 million to $688 million from $698 million at December 31, 2017 primarily due to normal investing activity.

Our deposits decreased slightly but remained at $5.4 billion at both March 31, 2018 and December 31, 2017. The decrease of $40.8 million is primarily due to the competition for customer funds which resulted in declines in all categories except money market accounts compared to December 31, 2017.

Total borrowings also decreased $21.2 million from December 31, 2017 due to reduced funding needs.

Total shareholders’ equity increased by $11.4 million at March 31, 2018 compared to December 31, 2017. The increase was primarily due to net income of $26.2 million offset partially by dividends of $7.7 million. The $7.0 million decrease in other comprehensive income was due to a $7.5 million decrease in unrealized losses on our available-for-sale investment securities and a $0.5 million change in the funded status of our employee benefit plans.

Securities Activity

(dollars in thousands)	March 31, 2018		December 31, 2017		$ Change
U.S. treasury securities	$	14,661	$	19,789	$	(5,128	)
Obligations of U.S. government corporations and agencies	160,589		162,193		(1,604		)
Collateralized mortgage obligations of U.S. government corporations and agencies	102,582		108,688		(6,106		)
Residential mortgage-backed securities of U.S. government corporations and agencies	30,683		32,854		(2,171		)
Commercial mortgage-backed securities of U.S. government corporations and agencies	248,798		242,221		6,577
Obligations of states and political subdivisions	125,141		127,402		(2,261		)
Debt Securities Available-for-Sale	682,454		693,147		(10,693		)
Marketable equity securities	5,196		5,144		52
Total Securities	$	687,650	$	698,291	$	(10,641	)

We invest in various securities in order to maintain a source of liquidity, to satisfy various pledging requirements, to increase net interest income and as a tool of ALCO to reposition the balance sheet for interest rate risk purposes. Securities are subject to market risks that could negatively affect the level of liquidity available to us. Security purchases are subject to an investment policy approved annually by our Board of Directors and administered through ALCO and our treasury function. Securities decreased $10.6 million to $688 million from $698 million at December 31, 2017 primarily due to a decrease in market value of the bond portfolio.

At March 31, 2018 our bond portfolio was in a net unrealized loss position of $7.8 million compared to a net unrealized gain position of $1.7 million at December 31, 2017. At March 31, 2018 total gross unrealized gains in the bond portfolio were $3.1 million offset by $10.9 million of gross unrealized losses, compared to December 31, 2017, when total gross unrealized gains were $5.6 million offset by gross unrealized losses of $3.9 million. Management evaluates the securities portfolio for other than temporary impairment, or OTTI, on a quarterly basis. During the three months ended March 31, 2018 and 2017, we did not record any OTTI. The performance of the debt securities market could generate impairments in future periods requiring realized losses to be reported.

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Loan Composition

	March 31, 2018				December 31, 2017
(dollars in thousands)	Amount		% of Loans		Amount		% of Loans
Commercial
Commercial real estate	$	2,760,891	48.18	%	$	2,685,994	46.62	%
Commercial and industrial	1,406,950		24.55		1,433,266		24.88
Construction	324,141		5.66		384,334		6.67
Total Commercial Loans	4,491,982		78.39	%	4,503,594		78.17	%
Consumer
Residential mortgage	692,385		11.98	%	698,774		12.13	%
Home equity	474,850		8.29		487,326		8.46
Installment and other consumer	66,890		1.17		67,204		1.17
Construction	4,506		0.08		4,551		0.08
Total Consumer Loans	1,238,631		21.61	%	1,257,855		21.83	%
Total Portfolio Loans	5,730,613		100.00	%	5,761,449		100.00	%
Loans Held for Sale	3,283				4,485
Total Loans	$	5,733,896			$	5,765,934

Our loan portfolio represents our most significant source of interest income. The risk that borrowers will be unable to pay such obligations is inherent in the loan portfolio. Other conditions such as downturns in the borrower's industry or the overall economic climate can significantly impact the borrower’s ability to pay.

Total portfolio loans decreased by $30.8 million to $5.7 billion at March 31, 2018 compared to $5.8 billion at December 31, 2017. We experienced a decline in all loan portfolios primarily due to higher than usual historical payoffs combined with lower seasonal demand.

Allowance for Loan Losses

We maintain an ALL at a level determined to be adequate to absorb estimated probable credit losses inherent within the loan portfolio as of the balance sheet date, and it is presented as a reserve against loans in the Consolidated Balance Sheets. Determination of an adequate ALL is inherently subjective and may be subject to significant changes from period to period. The methodology for determining the ALL has two main components: evaluation and impairment tests of individual loans and evaluation and impairment tests of certain groups of homogeneous loans with similar risk characteristics.

An inherent risk to the loan portfolio as a whole is the condition of the economy in our markets. In addition, each loan segment carries with it risks specific to the segment. We develop and document a systematic ALL methodology based on the following portfolio segments: 1. CRE, 2. C&I, 3. Commercial Construction, 4. Consumer Real Estate and 5. Other Consumer. The following is a discussion of the key risks by portfolio segment that management assesses in preparing the ALL.

CRE loans are secured by commercial purpose real estate, including both owner occupied properties and investment properties, for various purposes such as hotels, strip malls and apartments. Operations of the individual projects as well as global cash flows of the debtors are the primary sources of repayment for these loans. The condition of the local economy is an important indicator of risk, but there are also more specific risks depending on the collateral type as well as the business prospects of the lessee, if the project is not owner occupied.

C&I loans are made to operating companies or manufacturers for the purpose of production, operating capacity, accounts receivable, inventory or equipment financing. Cash flow from the operations of the company is the primary source of repayment for these loans. The condition of the local economy is an important indicator of risk, but there are also more specific risks depending on the industry of the company. Collateral for these types of loans often does not have sufficient value in a distressed or liquidation scenario to satisfy the outstanding debt.

Commercial Construction loans are made to finance construction of buildings or other structures, as well as to finance the acquisition and development of raw land for various purposes. While the risk of these loans is generally confined to the construction period, if there are problems, the project may not be completed, and as such, may not provide sufficient cash flow on its own to service the debt or have sufficient value in a liquidation to cover the outstanding principal. The condition of the local economy is an important indicator of risk, but there are also more specific risks depending on the type of project and the experience and resources of the developer.

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Item 2. MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS - continued

Consumer Real Estate loans are secured by first and second liens such as home equity loans, home equity lines of credit and 1-4 family residential mortgages, including purchase money mortgages. The primary source of repayment for these loans is the income and assets of the borrower. The condition of the local economy, in particular the unemployment rate, is an important indicator of risk for this segment. The state of the local housing markets can also have a significant impact on this segment because low demand and/or declining home values can limit the ability of borrowers to sell a property and satisfy the debt.

Other Consumer loans are made to individuals and may be secured by assets other than 1-4 family residences, as well as unsecured loans. This segment includes auto loans and unsecured loans and lines. The primary source of repayment for these loans is the income and assets of the borrower. The condition of the local economy, in particular the unemployment rate, is an important indicator of risk for this segment. The value of the collateral, if there is any, is less likely to be a source of repayment due to less certain collateral values.

The following tables summarize the ALL and recorded investments in loans by category for the dates presented:

	March 31, 2018
	Allowance for Loan Losses						Portfolio Loans
(dollars in thousands)	Individually Evaluated for Impairment		Collectively Evaluated for Impairment		Total		Individually Evaluated for Impairment		Collectively Evaluated for Impairment		Total
Commercial real estate	$	—	$	30,963	$	30,963	$	3,774	$	2,757,117	$	2,760,891
Commercial and industrial	537		9,935		10,472		12,573		1,394,377		1,406,950
Commercial construction	—		10,721		10,721		3,444		320,697		324,141
Consumer real estate	—		5,418		5,418		10,052		1,161,689		1,171,741
Other consumer	39		1,433		1,472		49		66,841		66,890
Total	$	576	$	58,470	$	59,046	$	29,892	$	5,700,721	$	5,730,613

	December 31, 2017
	Allowance for Loan Losses						Portfolio Loans
(dollars in thousands)	Individually Evaluated for Impairment		Collectively Evaluated for Impairment		Total		Individually Evaluated for Impairment		Collectively Evaluated for Impairment		Total
Commercial real estate	$	—	$	27,235	$	27,235	$	3,546	$	2,682,448	$	2,685,994
Commercial and industrial	29		8,937		8,966		7,284		1,425,982		1,433,266
Commercial construction	—		13,167		13,167		5,464		378,870		384,334
Consumer real estate	21		5,458		5,479		10,488		1,180,163		1,190,651
Other consumer	27		1,516		1,543		41		67,163		67,204
Total	$	77	$	56,313	$	56,390	$	26,823	$	5,734,626	$	5,761,449

	March 31, 2018			December 31, 2017
Ratio of net charge-offs to average loans outstanding	(0.01	)%	*	0.18	%
Allowance for loan losses as a percentage of total loans	1.03	%		0.98	%
Allowance for loan losses to nonperforming loans	277	%		236	%

^* Annualized

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Item 2. MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS - continued

The ALL was $59.0 million, or 1.03 percent of total portfolio loans at March 31, 2018 compared to $56.4 million, or 0.98 percent of total portfolio loans at December 31, 2017. The increase in the ALL of $2.7 million was primarily due to a $2.2 million increase in the reserve for loans collectively evaluated for impairment and an increase of $0.5 million in specific reserves for loans individually evaluated for impairment at March 31, 2018 compared to December 31, 2017. Commercial special mention, substandard and doubtful loans increased $67.5 million to $268 million compared to $201 million at December 31, 2017, with an increase of $18.6 million in special mention and an increase of $48.9 million in substandard. Impaired loans increased $3.1 million, or 11.4 percent, from December 31, 2017 to $29.9 million at March 31, 2018. The increase was primarily due to two C&I impaired loans totaling $6.0 million offset by a $2.0 million commercial construction loan that paid off in the first quarter of 2018. We had net loan recoveries of $0.2 million for the three months ended March 31, 2018 comprised primarily of one commercial construction loan that paid off and resulted in a $1.0 million recovery.

We individually evaluate all substandard and nonaccrual commercial loans greater than $0.5 million for impairment. A loan is impaired when, based on current information and events, it is probable that we will be unable to collect all amounts due according to the contractual terms of the loan agreement. Our methodology for evaluating whether a loan is impaired includes risk-rating credits on an individual basis and consideration of the borrower’s overall financial condition, payment history and available cash resources. In measuring impairment, we primarily utilize fair market value of the collateral; however, we also use discounted cash flow when warranted.

Troubled debt restructurings, or TDRs, whether on accrual or nonaccrual status, are also classified as impaired loans. TDRs are loans where we, for economic or legal reasons related to a borrower’s financial difficulties, grant a concession to the borrower that we would not otherwise grant. We strive to identify borrowers in financial difficulty early and work with them to modify the terms before their loan reaches nonaccrual status. These modified terms generally include extensions of maturity dates at a stated interest rate lower than the current market rate for a new loan with similar risk characteristics, reductions in contractual interest rates or principal deferment. While unusual, there may be instances of principal forgiveness. These modifications are generally for longer term periods that would not be considered insignificant. Additionally, we classify loans where the debt obligation has been discharged through a Chapter 7 Bankruptcy and not reaffirmed by the borrower as TDRs.

An accruing loan that is modified into a TDR can remain in accrual status if, based on a current credit analysis, collection of principal and interest in accordance with the modified terms is reasonably assured, and the borrower has demonstrated sustained historical repayment performance for a reasonable period before the modification. All TDRs are considered to be impaired loans and will be reported as impaired loans for their remaining lives, unless the restructuring agreement specifies an interest rate equal to or greater than the rate that would be accepted at the time of the restructuring for a new loan with comparable risk and we fully expect that the remaining principal and interest will be collected according to the restructured agreement. For all TDRs, regardless of size, as well as all other impaired loans, we conduct further analysis to determine the probable loss and assign a specific reserve to the loan if deemed appropriate. Further, all impaired loans are reported as nonaccrual loans unless the loan is a TDR that has met the requirements to be returned to accruing status. TDRs can be returned to accruing status if the ultimate collectability of all contractual amounts due, according to the restructured agreement, is not in doubt and there is a period of a minimum of six months of satisfactory payment performance by the borrower either immediately before or after the restructuring.

As an example, consider a substandard commercial construction loan that is currently 90 days past due where the loan is restructured to extend the maturity date for a period longer than would be considered an insignificant period of time. The post-modification interest rate given to the borrower is considered to be lower than the current market rate for new debt with similar risk and all other terms remain the same according to the original loan agreement. This loan will be considered a TDR as the borrower is experiencing financial difficulty and a concession has been granted due to the long extension, resulting in payment delay as well as the rate being lower than current market rate for new debt with similar risk. The loan will be reported as a nonaccrual TDR and an impaired loan. In addition, the loan could be charged down to the fair value of the collateral if a confirmed loss exists. If the loan subsequently performs, by means of making on-time principal and interest payments according to the newly restructured terms for a period of six months, and it is expected that all remaining principal and interest will be collected according to the terms of the restructured agreement, the loan will be returned to accrual status and reported as an accruing TDR. The loan will remain an impaired loan for the remaining life of the loan because the interest rate was not adjusted to be equal to or greater than the rate that would be accepted at the time of the restructuring for a new loan with comparable risk.

TDRs increased $2.5 million to $28.6 million at March 31, 2018 compared to $26.1 million at December 31, 2017. The increase is primarily due to new TDRs totaling $6.8 million, which were offset by principal reductions and charge-offs. Total TDRs of $28.6 million at March 31, 2018 included $20.0 million, or 70.1 percent, that were accruing and $8.6 million, or 29.9 percent, that were nonaccrual.

Our charge-off policy for commercial loans requires that loans and other obligations that are not collectible be promptly charged-off when the loss becomes probable, regardless of the delinquency status of the loan. We may elect to recognize a

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Item 2. MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS - continued

partial charge-off when management has determined that the value of collateral is less than the remaining investment in the loan. A loan or obligation does not need to be charged-off, regardless of delinquency status, if (i) management has determined there exists sufficient collateral to protect the remaining loan balance and (ii) there exists a strategy to liquidate the collateral. Management may also consider a number of other factors to determine when a charge-off is appropriate. These factors may include, but are not limited to:

•The status of a bankruptcy proceeding

•The value of collateral and probability of successful liquidation; and/or

•The status of adverse proceedings or litigation that may result in collection

Consumer unsecured loans and secured loans are evaluated for charge-off after the loan becomes 90 days past due. Unsecured loans are fully charged-off and secured loans are charged-off to the estimated fair value of the collateral less the cost to sell.

Our allowance for lending-related commitments is determined using a methodology similar to that used for the ALL. Amounts are added to the allowance for lending-related commitments by a charge to current earnings through noninterest expense. The reserve is calculated by applying historical loss rates to unfunded commitments and considering qualitative factors. The allowance for unfunded loan commitments was $2.1 million at March 31, 2018 compared to $2.2 million at December 31, 2017. The decrease primarily related to a decline in the historic loss rate for C&I commitments and a decrease in the balance of total unfunded commitments. The allowance for unfunded commitments is included in other liabilities in the Consolidated Balance Sheets.

Nonperforming assets consist of nonaccrual loans, nonaccrual TDRs and OREO. The following table summarizes nonperforming assets for the dates presented:

(dollars in thousands)	March 31, 2018			December 31, 2017			$ Change
Nonperforming Loans
Commercial real estate	$	3,008		$	2,501		$	507
Commercial and industrial	1,581			2,449			(868		)
Commercial construction	1,459			1,460			(1		)
Residential mortgage	4,075			3,580			495
Home equity	2,589			2,736			(147		)
Installment and other consumer	63			62			1
Consumer construction	—			—			—
Total Nonperforming Loans	12,775			12,788			(13		)
Nonperforming Troubled Debt Restructurings
Commercial real estate	944			967			(23		)
Commercial and industrial	3,036			3,197			(161		)
Commercial construction	414			2,413			(1,999		)
Residential mortgage	2,640			3,585			(945		)
Home equity	1,520			979			541
Installment and other consumer	6			9			(3		)
Total Nonperforming Troubled Debt Restructurings	8,560			11,150			(2,590		)
Total Nonperforming Loans	21,335			23,938			(2,603		)
OREO	2,920			469			2,451
Total Nonperforming Assets	$	24,255		$	24,407		$	(152	)
Asset Quality Ratios:
Nonperforming loans as a percent of total loans	0.37		%	0.42		%
Nonperforming assets as a percent of total loans plus OREO	0.42		%	0.42		%

Our policy is to place loans in all categories in nonaccrual status when collection of interest or principal is doubtful, or generally when interest or principal payments are 90 days or more past due.

Nonperforming assets, or NPAs, decreased $0.2 million to $24.2 million at March 31, 2018 compared to $24.4 million at December 31, 2017. The decrease was due to a $2.6 million decline in nonperforming loans offset by an increase of $2.4 million in other real estate owned, or OREO. The $2.6 million decrease in nonperforming loans was due to the payoff of a

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Item 2. MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS - continued

commercial construction loan for $2.0 million and the increase in OREO related to two land lots that are no longer intended to be future branch locations.

During the three months ended March 31, 2018 there were net loan recoveries of $0.2 million compared to net charge-offs of $2.1 million for the same period in 2017. The provision for loan loss was $2.5 million compared to $5.2 million for the three months ended March 31, 2017. The allowance for loan losses, or ALLL, to total portfolio loans was 1.03 percent at March 31, 2018 compared to 0.98 percent at December 31, 2017. The increase in the ALLL is primarily due to an increase in special mention and substandard loans compared to December 31, 2017.

Deposits

(dollars in thousands)	March 31, 2018		December 31, 2017		$ Change
Customer Deposits
Noninterest-bearing demand	$	1,368,350	$	1,387,712	$	(19,362	)
Interest-bearing demand	555,319		599,986		(44,667		)
Money market	985,793		880,330		105,463
Savings	876,459		893,119		(16,660		)
Certificates of deposit	1,238,539		1,286,988		(48,449		)
Total Customer Deposits	5,024,460		5,048,135		(23,675		)
Brokered Deposits
Interest-bearing demand	5,392		3,155		2,237
Money market	253,607		265,826		(12,219		)
Certificates of deposit	103,635		110,775		(7,140		)
Total Brokered Deposits	362,634		379,756		(17,122		)
Total Deposits	$	5,387,094	$	5,427,891	$	(40,797	)

Deposits are our primary source of funds. We believe that our deposit base is stable and that we have the ability to attract new deposits. Total deposits at March 31, 2018 decreased $40.8 million from December 31, 2017. Total customer deposits decreased $23.7 million from December 31, 2017. Noninterest-bearing demand and interest-bearing demand balances decreased $19.4 million and $44.7 million, respectively. These decreases were a result of outflows due to normal repositioning by our customers combined with some seasonality in a number of sectors, including public funds. The money market increase of $105 million is related to a competitively-priced, indexed product that was a major factor behind the savings decrease of $16.7 million and the certificates of deposits decrease of $48.4 million. Total brokered deposits decreased $17.1 million from December 31, 2017. Brokered deposits are an additional source of funds utilized by the ALCO as a way to diversify funding sources, as well as manage our funding costs and structure.

Borrowings

(dollars in thousands)	March 31, 2018		December 31, 2017		$ Change
Securities sold under repurchase agreements	$	44,617	$	50,161	$	(5,544	)
Short-term borrowings	525,000		540,000		(15,000		)
Long-term borrowings	46,684		47,301		(617		)
Junior subordinated debt securities	45,619		45,619		—
Total Borrowings	$	661,920	$	683,081	$	(21,161	)

Borrowings are an additional source of funding for us. Total borrowings decreased $21.2 million from December 31, 2017 due to reduced funding needs.

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Item 2. MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS - continued

Information pertaining to short-term borrowings is summarized in the tables below for the three and twelve months period ended March 31, 2018 and December 31, 2017.

	Securities Sold Under Repurchase Agreements
(dollars in thousands)	March 31, 2018			December 31, 2017
Balance at the period end	$	44,617		$	50,161
Average balance during the period	47,774			46,662
Average interest rate during the period	0.39		%	0.12		%
Maximum month-end balance during the period	$	49,867		$	53,609
Average interest rate at the period end	0.42		%	0.39		%
	Short-Term Borrowings
(dollars in thousands)	March 31, 2018			December 31, 2017
Balance at the period end	$	525,000		$	540,000
Average balance during the period	596,014			644,864
Average interest rate during the period	1.71		%	1.15		%
Maximum month-end balance during the period	$	665,000		$	734,600
Average interest rate at the period end	1.86		%	1.47		%

Information pertaining to long-term borrowings is summarized in the tables below for three and twelve month periods ended March 31, 2018 and December 31, 2017.

	Long-Term Borrowings
(dollars in thousands)	March 31, 2018			December 31, 2017
Balance at the period end	$	46,684		$	47,301
Average balance during the period	46,938			18,057
Average interest rate during the period	1.99		%	2.57		%
Maximum month-end balance during the period	$	47,096		$	47,505
Average interest rate at the period end	2.09		%	1.88		%
	Junior Subordinated Debt Securities
(dollars in thousands)	March 31, 2018			December 31, 2017
Balance at the period end	$	45,619		$	45,619
Average balance during the period	45,619			45,619
Average interest rate during the period	4.14		%	3.65		%
Maximum month-end balance during the period	$	45,619		$	45,619
Average interest rate at the period end	4.58		%	3.78		%

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Item 2. MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS - continued

Liquidity and Capital Resources

Liquidity is defined as a financial institution’s ability to meet its cash and collateral obligations at a reasonable cost. This includes the ability to satisfy the financial needs of depositors who want to withdraw funds or of borrowers needing to access funds to meet their credit needs. In order to manage liquidity risk our Board of Directors has delegated authority to the ALCO for formulation, implementation, and oversight of liquidity risk management for S&T. The ALCO’s goal is to maintain adequate levels of liquidity at a reasonable cost to meet funding needs in both a normal operating environment and for potential liquidity stress events. The ALCO monitors and manages liquidity through various ratios, reviewing cash flow projections, performing stress tests, and by having a detailed contingency funding plan.The ALCO policy guidelines define graduated risk tolerance levels. If our liquidity position moves to a level that has been defined as high risk, specific actions are required, such as increased monitoring or the development of an action plan to reduce the risk position.

Our primary funding and liquidity source is a stable customer deposit base. We believe S&T has the ability to retain existing and attract new deposits, mitigating any funding dependency on other more volatile sources. Refer to the Financial Condition - Deposits Section of this MD&A, for additional discussion on deposits. Although deposits are the primary source of funds, we have identified various other funding sources that can be used as part of our normal funding program when either a structure or cost efficiency has been identified. Additional funding sources accessible to S&T include borrowing availability at the FHLB of Pittsburgh, Federal Funds lines with other financial institutions, the brokered deposit market, and borrowing availability through the Federal Reserve Borrower-In-Custody program.

An important component of our ability to effectively respond to potential liquidity stress events is maintaining a cushion of highly liquid assets. Highly liquid assets are those that can be converted to cash quickly, with little or no loss in value, to meet financial obligations. ALCO policy guidelines define a ratio of highly liquid assets to total assets by graduated risk tolerance levels of minimal, moderate, and high. At March 31, 2018, we had $531 million in highly liquid assets, which consisted of $65.7 million in interest-bearing deposits with banks, $462 million in unpledged securities and $3.3 million in loans held for sale. This resulted in a highly liquid assets to total assets ratio of 7.6 percent at March 31, 2018. Also, at March 31, 2018, we had a remaining borrowing availability of $1.8 billion with the FHLB of Pittsburgh. Refer to Note 8 Borrowings in the Notes to Consolidated Financial Statements and the Financial Condition - Borrowings section of this MD&A for more details.

The following table summarizes capital amounts and ratios for S&T and S&T Bank for the dates presented:

(dollars in thousands)	Adequately Capitalized		Well- Capitalized		March 31, 2018				December 31, 2017
					Amount		Ratio		Amount		Ratio
S&T Bancorp, Inc.
Tier 1 leverage	4.00	%	5.00	%	$	655,939	9.72	%	$	628,876	9.17	%
Common equity tier 1 to risk-weighted assets	4.50	%	6.50	%	635,939		11.02	%	608,876		10.71	%
Tier 1 capital to risk-weighted assets	6.00	%	8.00	%	655,939		11.36	%	628,876		11.06	%
Total capital to risk-weighted assets	8.00	%	10.00	%	742,106		12.85	%	713,056		12.55	%
S&T Bank
Tier 1 leverage	4.00	%	5.00	%	$	610,305	9.07	%	$	582,929	8.52	%
Common equity tier 1 to risk-weighted assets	4.50	%	6.50	%	610,305		10.60	%	582,929		10.29	%
Tier 1 capital to risk-weighted assets	6.00	%	8.00	%	610,305		10.60	%	582,929		10.29	%
Total capital to risk-weighted assets	8.00	%	10.00	%	696,472		12.09	%	666,560		11.76	%

We have filed a shelf registration statement on Form S-3 under the Securities Act of 1933 as amended, with the SEC, which allows for the issuance of a variety of securities including debt and capital securities, preferred and common stock and warrants. We may use the proceeds from the sale of securities for general corporate purposes, which could include investments at the holding company level, investing in, or extending credit to subsidiaries, possible acquisitions and stock repurchases. As of March 31, 2018, we had not issued any securities pursuant to this shelf registration statement.

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Item 3. QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

Market risk is defined as the degree to which changes in interest rates, foreign exchange rates, commodity prices, or equity prices can adversely affect a financial institution’s earnings or capital. For most financial institutions, including S&T, market risk primarily reflects exposures to changes in interest rates. Interest rate fluctuations affect earnings by changing net interest income and other interest-sensitive income and expense levels. Interest rate changes also affect capital by changing the net present value of a bank’s future cash flows, and the cash flows themselves, as rates change. Accepting this risk is a normal part of banking and can be an important source of profitability and enhancing shareholder value. However, excessive interest rate risk can threaten a bank’s earnings, capital, liquidity and solvency. Our sensitivity to changes in interest rate movements is continually monitored by the ALCO. The ALCO monitors and manages market risk through rate shock analyses, economic value of equity, or EVE, analyses and by performing stress tests and simulations in order to mitigate earnings and market value fluctuations due to changes in interest rates.

Rate shock analyses results are compared to a base case to provide an estimate of the impact that market rate changes may have on 12 and 24 months of pretax net interest income. The base case and rate shock analyses are performed on a static balance sheet. A static balance sheet is a no growth balance sheet in which all maturing and/or repricing cash flows are reinvested in the same product at the existing product spread. Rate shock analyses assume an immediate parallel shift in market interest rates and also include management assumptions regarding the impact of interest rate changes on non-maturity deposit products (noninterest-bearing demand, interest-bearing demand, money market and savings) and changes in the prepayment behavior of loans and securities with optionality. S&T policy guidelines limit the change in pretax net interest income over 12 and 24 month horizons using rate shocks in increments of +/- 100 basis points. Policy guidelines define the percentage change in pretax net interest income by graduated risk tolerance levels of minimal, moderate and high. We have temporarily suspended the analyses on downward rate shocks of 200 basis points or more. Due to the low interest rate environment, we believe the impact to net interest income when evaluating these basis point rate shock scenarios does not provide meaningful insight into our interest rate risk position.

In order to monitor interest rate risk beyond the 24 month time horizon of rate shocks on pretax net interest income, we also perform EVE analyses. EVE represents the present value of all asset cash flows minus the present value of all liability cash flows. EVE change results are compared to a base case to determine the impact that market rate changes may have on our EVE. As with rate shock analyses on pretax net interest income, EVE analyses incorporate management assumptions regarding prepayment behavior of fixed rate loans and securities with optionality and the behavior and value of non-maturity deposit products.S&T policy guidelines limit the change in EVE using rate shocks in increments of +/- 100 basis points. Policy guidelines define the percentage change in EVE by graduated risk tolerance levels of minimal, moderate and high. We have also temporarily suspended the downward rate shocks of 200 basis points or more for EVE due to the low interest rate environment.

The table below reflects the rate shock analyses results for the 1 - 12 and 13 - 24 month periods of pretax net interest income and EVE. All results are in the minimal risk tolerance level.

	March 31, 2018						December 31, 2017
	1 - 12 Months		13 - 24 Months		% Change            in EVE		1 - 12 Months		13 - 24 Months		% Change            in EVE
Change in Interest Rate (basis points)	% Change in       Pretax Net Interest Income		% Change in       Pretax Net Interest Income				% Change in       Pretax Net Interest Income		% Change in       Pretax Net Interest Income
400	7.7	%	12.0	%	(11.6	)%	5.5	%	12.4	%	(9.2	)%
300	5.7		8.9		(5.9	)	4.2		9.3		(3.6	)
200	3.5		5.7		(1.7	)	2.4		5.9		0.3
100	1.8		3.0		0.7		1.3		3.2		1.9
(100)	(3.6	)	(5.5	)	(6.7	)	(3.6	)	(6.5	)	(8.0	)

The results from the rate shock analyses on net interest income are consistent with having an asset sensitive balance sheet.Having an asset sensitive balance sheet means more assets than liabilities will reprice during the measured time frames. The implications of an asset sensitive balance sheet will differ depending upon the change in market interest rates. For example, with an asset sensitive balance sheet in a declining interest rate environment, more assets than liabilities will decrease in rate. This situation could result in a decrease in net interest income and operating income. Conversely, with an asset sensitive balance sheet in a rising interest rate environment, more assets than liabilities will increase in rate. This situation could result in an increase in net interest income and operating income.

49

Item 3. QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

Our rate shock analyses show an improvement in the percentage change in pretax net interest income in the rates up scenarios in months 1 - 12 and no change in the rates down when comparing March 31, 2018 to December 31, 2017. The improvement is mainly a result of becoming more asset sensitive due to less rate sensitivity in our wholesale funding portfolio. In months 13 - 24 the percentage change in pretax net interest income increased in the rates down scenario and declined only slightly in all rates up scenarios when comparing March 31, 2018 and December 31, 2017. These changes are mostly due to model enhancements. All rate shock analyses for both the 1 - 12 and 13 - 24 month periods continue to remain within minimal risk tolerance levels.

Our EVE analyses show a decline in the percentage change in EVE in the rates up scenarios and an improvement in the rates down scenario when comparing March 31, 2018 to December 31, 2017. The changes are mainly a result of deposit valuation enhancements and the change in value of our core deposits.

In addition to rate shocks and EVE analyses, we perform a market risk stress test at least annually. The market risk stress test includes sensitivity analyses and simulations. Sensitivity analyses are performed to help us identify which model assumptions cause the greatest impact on pretax net interest income. Sensitivity analyses may include changing prepayment behavior of loans and securities with optionality and the impact of interest rate changes on non-maturity deposit products.Simulation analyses may include the potential impact of rate changes other than the policy guidelines , yield curve shape changes, significant balance mix changes and various growth scenarios. For example, simulations indicate that an increase in rates, particularly if the yield curve steepens, will most likely result in an improvement in pretax net interest income. We realize that some of the benefit reflected in our scenarios may be offset by a change in the competitive environment and a change in product preference by our customers.

Item 4. CONTROLS AND PROCEDURES

Evaluation of Disclosure Controls and Procedures

Under the supervision and with the participation of S&T’s Chief Executive Officer, or CEO, and Chief Financial Officer, or CFO (its principal executive officer and principal financial officer, respectively), management has evaluated the effectiveness of the design and operation of S&T’s disclosure controls and procedures as of March 31, 2018. In designing and evaluating the disclosure controls and procedures, management recognizes that any controls and procedures, no matter how well designed and operated, can provide only reasonable assurance of achieving the desired control objectives.

We maintain disclosure controls and procedures that are designed to ensure that information required to be disclosed by us in the reports that we file or submit under the Securities Exchange Act of 1934, as amended, or the Exchange Act, is recorded, processed, summarized and reported within the time periods required by the Securities and Exchange Commission, or the SEC, and that such information is accumulated and communicated to S&T’s management, including our CEO and CFO, as appropriate to allow timely decisions regarding required disclosure.

Based on and as of the date of such evaluation, our CEO and CFO concluded that the design and operation of our disclosure controls and procedures were not effective as of March 31, 2018 due to a material weakness in S&T’s internal control over financial reporting as previously described in our Annual Report on Form 10-K for the period ended December 31, 2017.

A material weakness is a deficiency, or a combination of deficiencies, in internal control over financial reporting, such that there is a reasonable possibility that a material misstatement of the company’s annual or interim financial statements will not be prevented or detected on a timely basis.

The material weakness is due to a control deficiency that exists related to the inconsistent assessment of internally assigned risk ratings, which is one of several factors used to estimate the allowance for loan losses. In some instances where performing borrowers had experienced a deteriorating financial position or cash flows, our internal Loan Review Department relied upon credit risk mitigants, including guarantor support and/or more recent borrower financial performance when that information did not adequately support the loan risk rating.

Notwithstanding the material weakness discussed above, the company's management, including the CEO and CFO, has concluded that the company's financial statements included in this Form 10-Q present fairly, in all material respects, the company's financial position, results of operations and cash flows for the periods presented in accordance with U.S. generally accepted accounting principles.

Remediation Plan

Management is in the process of remediating this material weakness and has engaged an independent third-party to evaluate our policies, procedures and resources related to the assessment of risk ratings. We intend to provide additional training and improve our documentation to strengthen the support for the judgments applied to risk rating conclusions by our internal Loan Review Department.

50

S&T BANCORP, INC. AND SUBSIDIARIES

Changes in Internal Control Over Financial Reporting

There have been no other changes in S&T’s internal control over financial reporting that occurred during the quarter ended March 31, 2018 that have materially affected, or are reasonably likely to materially affect, S&T’s internal control over financial reporting, other than as described above under "Remediation Plan".

51

S&T BANCORP, INC. AND SUBSIDIARIES

PART II

OTHER INFORMATION

Item 1. Legal Proceedings

None

Item 1A. Risk Factors

There have been no material changes to the risk factors that we have previously disclosed in Item 1A – “Risk Factors” in our Annual Report on Form 10-K for the year ended December 31, 2017, as filed with the SEC on March 1, 2018.

Item 2. Unregistered Sales of Equity Securities and Use of Proceeds

The following table presents information in connection with purchases of our common stock made by, or, on behalf of us, during the first quarter of 2018.

Period	Total Number of Shares Purchased	Average Price Paid per Share		Total Number of Shares Purchased as Part of Publicly Announced Plans or Programs	Maximum Dollar Value that May Yet be Purchased under the Plan or Programs
January 1, 2018 to January 31, 2018
Open market repurchases	—	$	—	—
Other transactions(1)	—	$	—	—
February 1, 2018 to February 28, 2018
Open market repurchases	—	$	—	—
Other transactions(1)	—	$	—	—
March 1, 2018 to March 31, 2018
Open market repurchases	—	$	—	—	$	50,000,000
Other transactions(1)	15,474	$	42.41	—
Total	15.474	$	42.41	—	$	50,000,000

⁽¹⁾During the three months ended March 31, 2018, pursuant to the terms of our restricted stock program, we purchased 15,474 shares at the then market value of the shares in connection with the vesting of restricted shares of employees under such program to satisfy certain tax withholding requirements through the delivery of shares to us instead of cash.

On March 19, 2018, the Board of Directors of S&T Bancorp, Inc. authorized a $50 million share repurchase plan. This purchase authorization, which is effective through August 31, 2019, permits S&T to repurchase from time to time up to $50 million in aggregate value of shares of S&T's common stock through a combination of open market and privately negotiated repurchases. The specific timing, price and quantity of repurchases will be at the discretion of S&T and will depend on a variety of factors, including general market conditions, the trading price of the common stock, legal and contractual requirements and S&T’s financial performance. The repurchase plan does not obligate S&T to repurchase any particular number of shares. S&T expects to fund any repurchases from cash on hand and internally generated funds. There were no open market repurchases during the three months ended March 31, 2018.

Item 3. Defaults Upon Senior Securities

None

Item 4. Mine Safety Disclosures

Not Applicable

Item 5. Other Information

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S&T BANCORP, INC. AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS – continued

NOTE 14. REVENUE FROM CONTRACTS WITH CUSTOMERS

None

Item 6. Exhibits

10.1	Employment Agreement of Thomas John Sposito II	Filed herewith
10.2	Change in Control Severance Agreement for John Sposito II	Filed herewith
31.1	Rule 13a-14(a) Certification of the Chief Executive Officer.	Filed herewith
31.2	Rule 13a-14(a) Certification of the Chief Financial Officer.	Filed herewith
32	Rule 13a-14(b) Certification of the Chief Executive Officer and Chief Financial Officer.	Filed herewith
101	The following financial information from the Registrant's Quarterly Report on Form 10-Q for the quarter ended March 31, 2018 is formatted in eXtensible Business Reporting Language (XBRL): (i) Unaudited Consolidated Balance Sheet at March 31, 2018 and Audited Consolidated Balance Sheet at December 31, 2017, (ii) Unaudited Consolidated Statements of Comprehensive Income for the Three Months ended March 31, 2018 and 2017, (iii) Unaudited Consolidated Statements of Changes in Shareholders’ Equity for the Three Months ended March 31, 2018 and 2017, (iv) Unaudited Consolidated Statements of Cash Flows for the Three Months ended March 31, 2018 and 2017 and (v) Notes to Unaudited Consolidated Financial Statements.	Filed herewith

53

S&T BANCORP, INC. AND SUBSIDIARIES

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, as amended, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.

	S&T Bancorp, Inc. (Registrant)
May 3, 2018	/s/ Mark Kochvar
	Mark Kochvar Senior Executive Vice President and Chief Financial Officer (Principal Financial Officer and Duly Authorized Signatory)

54

EX-31.1

Exhibit 31.1

CERTIFICATION

I, Todd D. Brice, certify that:

1. I have reviewed this quarterly report on Form 10-Q of S&T Bancorp, 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;

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.

Date: May 3, 2018

/s/ Todd D. Brice

Todd D. Brice, Chief Executive Officer (Principal Executive Officer)

EX-31.2

Exhibit 31.2

CERTIFICATION

I, Mark Kochvar, certify that:

1. I have reviewed this quarterly report on Form 10-Q of S&T Bancorp, 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;

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.

Date: May 3, 2018

/s/ Mark Kochvar

Mark Kochvar, Chief Financial Officer (Principal Financial Officer)

EX-32

Exhibit 32

CERTIFICATION OF THE CHIEF EXECUTIVE OFFICER

AND CHIEF FINANCIAL OFFICER

SARBANES-OXLEY ACT SECTION 906

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 S&T Bancorp, Inc. (the “Company”) Quarterly Report on Form 10-Q for the period ended March 31, 2018 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Todd D. Brice, Chief Executive Officer of the Company, and I, Mark Kochvar, Chief Financial Officer of the Company, certify, pursuant to 18 U.S.C. 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, to the best of my knowledge that:

1. The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended; and

2. The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company for the dates and period covered by the report.

This certificate is being made for the exclusive purpose of compliance by the Chief Executive Officer and Chief Financial Officer of the Company with the requirements of Section 906 of the Sarbanes-Oxley Act of 2002, and may not be disclosed, distributed or used by any person or for any reason other than as specifically required by law.

Date: May 3, 2018

/s/ Todd D. Brice	/s/ Mark Kochvar
Todd D. Brice, Chief Executive Officer (Principal Executive Officer)	Mark Kochvar, Chief Financial Officer (Principal Financial Officer)

EX-10.1

EMPLOYMENT AGREEMENT This EMPLOYMENT AGREEMENT (this “Agreement”), dated as of October 29, 2014 by and between Integrity Bank, a Pennsylvania Corporation (the “Bank”), and Thomas John Sposito II (the “Executive”). WHEREAS, contemporaneously herewith, Integrity Bancshares, Inc. (the “Company”), of which the Bank is a wholly-owned subsidiary, is entering into an Agreement and Plan of Merger, dated as of October 29, 2014, by and between S&T Bancorp, Inc. (“S&T”) and the Company (the “Merger Agreement”) pursuant to which the Company will be merged with and into S&T and the Bank will become a wholly-owned subsidiary of S&T (the “Merger”); and WHEREAS, it is contemplated that, after the closing date of the Merger and subject to applicable regulatory approvals, the Bank will be merged with and into S&T’s wholly owned subsidiary, S&T Bank, and will become a division of S&T Bank, in accordance with, and subject to, the terms of the Merger Agreement; and WHEREAS, the Bank desires to continue to retain the Executive on the terms and conditions set forth in this Agreement, and the Executive desires to provide such services on such terms and conditions; and NOW, THEREFORE, in consideration of the terms and mutual covenants herein and for other good and valuable consideration (the receipt of which is hereby acknowledged by the parties hereto), the parties agree as follows: 1. Services, Duties and Responsibilities. (a) The Bank hereby agrees to employ the Executive as a Senior Executive Vice President during the service period fixed by Section 3 hereof (the “Service Period”). The Executive shall report to the Bank’s President and Chief Executive Officer and shall have such duties and responsibilities as are assigned by the Board of Directors of the Bank (the “Board”) or the Bank’s Chief Executive Officer and consistent with such position (the “Services”). The Executive’s principal work location shall be at the Bank’s principal executive offices; provided that the Executive may be required to travel as reasonably necessary in order to perform the Executive’s duties and responsibilities hereunder. (b) During the Service Period, excluding any periods of vacation and sick leave to which the Executive is entitled, the Executive shall devote substantially all of the Executive’s working time, energy and attention to the performance of his duties and responsibilities hereunder and shall faithfully and diligently endeavor to promote the business of the Bank. During the Service Period, the Executive may not, without the prior written consent of the Board, directly or indirectly, operate, participate in the management, operations or control of, or act as an executive, officer, consultant, agent or representative of, any type of competitive business or service; provided that the Executive may, to the extent not otherwise prohibited by this Agreement, devote such amount of time as does not interfere with the performance of the Executive’s duties under this Agreement to engaging in community and charitable activities.

2 2. Compensation. (a) Base Salary. During the Service Period, the Executive shall be paid an annual base salary of $300,000 for the Executive’s services hereunder, payable in accordance with the normal and customary payroll procedures applicable to the Bank’s senior executives. The Executive’s base salary shall be subject to increase but not decrease, as determined by the Board in its discretion (such base salary, as in effect from time to time, the “Base Salary”). (b) Incentive Compensation. Executive shall be eligible for annual incentive awards under and in accordance with the terms of any incentive bonus plan that may be established by the Bank or S&T for the benefit of its senior executives, based on achievement of performance goals and other criteria set forth in such incentive plan. Executive will also be eligible to participate in any stock option, stock bonus, or other incentive plan available generally to other senior executives of the Bank from time to time. (c) Automobile. During the Service Period, the Bank shall provide the Executive with an automobile (of the same or equivalent model to the automobile provided by Bank as of the date of this Agreement) for the Executive’s business and personal use. The Bank shall be responsible for all title, insurance and maintenance costs with respect to such vehicle, and all gasoline expenses excluding those for personal use. (d) Club Membership. During the Service Period, the Bank shall pay the dues and assessments for Executive to be a member of the Hershey Country Club and reimburse Executive for all ordinary, necessary, and reasonable business-related expenses incurred by Executive on Bank business at said club. As a condition to receiving such reimbursements, Executive shall submit to the Bank on a timely basis business expense reports in accordance with the expense reimbursement policies of the Bank in effect from time to time. (e) Other Benefits. The Executive shall be eligible to participate in all employee benefit plans and arrangements of the Bank applicable to other senior executives of the Bank (including, without limitation, medical, life, and disability insurance programs). (f) Vacation. The Executive shall be entitled paid vacation in accordance with the Bank’s vacation policy, provided that the Executive shall be entitled to not less than three (3) weeks of vacation in each calendar year (prorated for partial years). (g) Effective Time Bonus; Retention Payment. Within thirty (30) days after the Effective Time (as defined in the Merger Agreement), the Bank shall pay to the Executive a bonus in the amount of $15,000 (the “Effective Time Bonus”). If the Executive remains in the continuous employ of the Bank and its affiliates until the close of business on the date that is thirty (30) months after the Closing Date (as defined in the Merger Agreement) (the “Initial Term Completion Date”) and a Section 409A Change in Control (as defined below) has not previously occurred, the Bank shall pay to the Executive within thirty (30) days after such date a lump sum payment in an amount equal to the Executive’s Base Salary in effect immediately prior to the Initial Term Completion Date reduced by the amount of the Effective Time Bonus (the “Retention Payment”); provided, however that if the Executive has been in the continuous employ of the Bank and its affiliates until immediately prior to the occurrence of a Change in

3 Control that is a “change in control event” within the meaning of Treasury Regulation Section 1.409A-3(i)(5) (a “Section 409A Change in Control”), the Retention Payment (unless previously paid) shall instead be paid within five (5) business days after the date of such Section 409A Change in Control and shall be determined based on the Executive’s Base Salary in effect immediately prior such Section 409A Change in Control. (h) 2014 Bonus. The Bank shall pay to the Executive within five business days after the date of this Agreement a bonus (the “2014 Bonus”) in respect of calendar year 2014 services in the amount of $10,000. The Executive acknowledges and agrees that such bonus shall be taken into account in determining the amount of any annual bonus that may be paid to the Executive in respect of calendar year 2014. (i) Reimbursement of Business Expenses. The Bank shall promptly reimburse the Executive for all reasonable out-of-pocket business expenses (including mobile telephone expenses) and travel expenses incurred by the Executive in connection with the carrying out of the Executive’s responsibilities under this Agreement during the Service Period upon presentation of appropriate vouchers or other satisfactory evidence thereof and otherwise in accordance with applicable Bank policies. 3. Effective Time of Agreement; Service Period. (a) Effective Date of Agreement: Except with respect to Sections 2(h), 7, 8, 9, and 10(d) through 10(f) hereof, which shall be effective as of the date hereof, this Agreement shall become effective as of the Effective Time. If the Merger Agreement terminates in accordance with Section VIII thereof, this Agreement shall thereupon immediately terminate and be of no force or effect. (b) Term. The Service Period during which the Executive shall perform the Services for the Bank pursuant to this Agreement shall commence at the Effective Time, and shall expire on the Initial Term Completion Date, provided that nothing herein shall bar the parties from (a) extending the Service Period under this Agreement by mutual agreement or (b) continuing Executive’s employment by the Bank without extension of this Agreement. (c) Termination of Service Period. Notwithstanding the foregoing, the Service Period may be terminated at any time upon the earliest to occur of the following events or any of the events identified in Section 6: (i) Death or Disability. The Service Period shall terminate upon the Executive’s death or Disability. For this purpose, “Disability” means that either (A) the Executive is deemed disabled for purposes of any group or individual long-term disability policy maintained by the Bank that covers the Executive, or (B) in the good faith judgment of the Board, the Executive is substantially unable to perform the Executive’s duties under this Agreement for more than ninety (90) days, whether or not consecutive, in any twelve (12) month period, by reason of a physical or mental illness or injury. (ii) Termination for Cause by the Bank. The Bank may terminate the Service Period for Cause at any time effective upon written notice to the Executive. For purposes of this Agreement, the term “Cause” shall mean the termination of the Service Period

4 on account of (A) the Executive’s failure to substantially perform the Executive’s duties hereunder or as reasonably assigned to the Executive (other than by reason of Disability), after reasonable written demand for substantial performance has been delivered by the Board specifically identifying the manner in which the Board believes the Executive has not performed the Executive’s duties; (B) the Executive’s material breach of this Agreement or any material written policy of the Bank or S&T and Executive shall not have cured such breach (as determined in the reasonable judgment of the Board (or its designee) and only to the extent the breach can be cured) within fifteen (15) days after written notice from the Board (or its designee); (C) the Executive’s willful violation of any law, rule, or regulation (other than traffic violations or similar offenses) or final cease-and-desist order; or (D) an act or acts on the Executive’s part constituting (x) a felony or (y) a misdemeanor involving (i) fraud, moral turpitude, dishonesty, breach of trust or fiduciary duties, organized crime or racketeering; (ii) willful violation of securities or commodities laws or regulations; (iii) willful violation of depository institution laws or regulations; (iv) willful violation of housing authority laws or regulations; or (v) willful violation of the Bank’s or S&T’s code of conduct. (iii) Termination without Cause by the Bank. The Bank may terminate the Service Period without Cause. (iv) Termination by the Executive for Good Reason. The Executive may terminate the Service Period for Good Reason within ninety (90) days following the initial existence of the circumstances giving rise to Good Reason, subject to the terms and conditions of this Section 3(c)(iv). For purposes of this Agreement, the term “Good Reason” shall mean, unless the Executive shall have consented in writing thereto, (i) a material diminution in the Executive’s Base Salary, (ii) a material diminution in the Executive’s title, duties and responsibilities; (iii) a relocation of the Executive’s primary work location more than fifty (50) miles from Camp Hill, Pennsylvania; or (iv) any material breach of this Agreement by the Bank; provided that the Executive shall have delivered written notice to the Bank, within thirty (30) days of the initial existence of the circumstances giving rise to Good Reason, of the Executive’s intention to terminate the Service Period for Good Reason, which notice specifies in reasonable detail the circumstances claimed to give rise to the Executive’s right to terminate the Service Period for Good Reason, and the Bank shall not have cured such circumstances within thirty (30) days following the Bank’s receipt of such notice. If, following such thirty (30) day period, the Bank has not cured such circumstances and the Executive decides to proceed with the termination of the Service Period for Good Reason, such a termination will be effected by providing the Bank with a Notice of Termination. (v) Voluntary Termination by the Executive. The Executive may voluntarily terminate the Service Period (other than for Good Reason); provided that the Executive provides the Bank with notice of the Executive’s intent to terminate the Service Period at least sixty (60) days in advance of the Date of Termination. (d) Golden Parachute Limit. Notwithstanding any other provision of this Agreement, in the event that any portion of the Severance Payments or any other payment or benefit received or to be received by the Executive (whether pursuant to the terms of this Agreement or any other plan, arrangement or agreement) (collectively, the “Total Benefits”) would be subject to the excise tax imposed under Section 4999 of the Internal Revenue Code of

5 1986, as amended (the “Code”) (the “Excise Tax”), the Total Benefits shall be reduced to the extent necessary so that no portion of the Total Benefits is subject to the Excise Tax. All amounts payable in consideration of Executive’s covenants pursuant to Section 7, 8, and 9, as determined by a valuation firm selected by S&T and reasonably acceptable to the Executive, shall, for purposes of the determinations made under this Section 3(d), be excluded from the amounts considered “parachute payments” to the maximum extent permitted under Section 280G of the Code. All determinations required to be made under this Section 3(d) shall be made by tax counsel selected by S&T and reasonably acceptable to the Executive (“Tax Counsel”), which determinations shall be conclusive and binding on the Executive and S&T absent manifest error. All fees and expenses of Tax Counsel shall be borne solely by S&T. In the event any such reduction is required, the Total Benefits shall be reduced in a manner determined by S&T (by the minimum possible amounts) that is consistent with the requirements of Section 409A of the Code. The parties hereto hereby elect to use the Applicable Federal Rate that is in effect on the date this Agreement is entered into for purposes of determining the present value of any payments provided for hereunder for purposes of Section 280G of the Code. 4. Termination Procedure. (a) Notice of Termination. Any termination of the Service Period by the Bank or by the Executive (other than a termination on account of the Executive’s death) shall be communicated by written “Notice of Termination” to the other party in accordance with Section 10(c). (b) Date of Termination. “Date of Termination” shall mean (i) if the Service Period expires pursuant to Section 3(b) hereof, the date on which the expiration of the Service Period occurs; (ii) if the Service Period is terminated due to the Executive’s death or Disability, the date of the Executive’s death or Disability; (iii) if the Bank terminates the Service Period for Cause, the date on which the Notice of Termination is given; (iv) if the Executive terminates the Service Period for Good Reason, the date on which the Notice of Termination is given (or such other date as may be agreed to by the Bank); (v) if the Executive voluntarily terminates the Service Period (other than for Good Reason), the date specified in the Notice of Termination, which date shall be no earlier than sixty (60) days after the date such notice is given pursuant to Section 3(c)(v) hereof, unless otherwise agreed to by the parties; and (vi) if the Service Period is terminated for any other reason, the date on which a Notice of Termination is given or any later date (within thirty (30) days, or any alternative time period agreed upon by the parties, after the giving of such notice) as set forth in such Notice of Termination. 5. Rights and Obligations Upon Termination of the Service Period. (a) Termination by the Bank without Cause or by the Executive for Good Reason. In the event of the termination of the Service Period by the Bank without Cause or by the Executive for Good Reason (such termination being a “Qualifying Termination”), the Executive shall be entitled to the following: (i) any unpaid portion of the Base Salary through the Date of Termination (payable in accordance with the Bank’s normal payroll practices) and any vested benefits to which the Executive is entitled under the terms of the Bank’s employee benefit plans

6 and programs, subject to the terms of such plans and programs (collectively, the “Accrued Obligations”); (ii) the Executive shall continue to be paid the Executive’s Base Salary from the Termination Date through and until the Initial Term Completion Date, payable in accordance with the Company’s normal payroll practices; and (iii) if the Qualifying Termination occurs before the Initial Term Completion Date and before the occurrence of a Section 409A Change in Control, the Bank shall pay to Executive within thirty (30) days after the Initial Term Completion Date the Retention Payment that would have been paid to the Executive if the Executive had remained continuously employed by the Bank and/or its affiliates until the Initial Term Completion Date, calculated using the Executive’s Base Salary in effect immediately prior to the Qualifying Termination (such payment, together with the payments provided for by the preceding clause (ii), being the “Severance Payments”). Notwithstanding the foregoing provisions of this Section 5(a): (i) the Executive’s entitlement to the Severance Payments shall be subject to and conditioned upon the Executive providing to the Company an Irrevocable Release not later than sixty (60) days after the date of the Executive’s termination of employment; (ii) if the 60-day period following the Executive’s termination of employment begins in one calendar year and ends in another, the Severance Payments shall, to the extent required in order to comply with Section 409A of the Internal Revenue Code of 1986, as amended (the “Code”), commence on the first payroll date following the later of (A) the end of the calendar year in which the Executive’s termination of employment occurs or (B) the date the Executive satisfies the Irrevocable Release requirement; and (iii) the Executive’s entitlement to the Severance Payments shall be subject to and conditioned upon the Executive complying with Sections 7 and 8 of this Agreement. “Irrevocable Release” means a general release of claims in such customary form as shall be specified by the Bank that has been executed by the Executive and for which the revocation period under Age Discrimination in Employment Act of 1967, as amended, and the terms of the release have expired. (b) Death or Disability. If the Service Period is terminated as a result of the Executive’s Disability or death, the Executive or the Executive’s estate or beneficiaries, as the case may be, shall be entitled to (i) the Accrued Obligations and (ii) a pro-rated portion of the Retention Payment equal to the Retention Payment that would have been paid to the Executive if the Executive had remained continuously employed by the Bank and/or its affiliates until the Initial Term Completion Date times a fraction, the numerator which shall be the number of full calendar months from the Closing Date until the date of the termination of the Service Period and the denominator which shall be thirty (30). (c) Termination Upon the Expiration of the Service Period or by the Bank for Cause or by the Executive Voluntarily. If the Service Period expires pursuant to Section 3(b) hereof or is terminated by the Bank for Cause or voluntarily by the Executive (other than for Good Reason), the Executive shall be entitled to solely the Accrued Obligations. (d) Severance Benefits In Respect of March 2014 Employment Agreement. If the Service Period expires for any reason, the Bank shall pay to the Executive within thirty

7 (30) days after the Executive’s termination of employment (i) a lump sum cash payment in the amount of $650,000 and (ii) pay or provide the benefits described in the second and third sentences of Section 11(b) of the Executive Employment Agreement, dated March 20, 2014, between the Bank and the Executive (the “March 2014 Agreement”) (regardless of prior termination of such Agreement). The Executive acknowledges and agrees that such payments and benefits constitute full payment and satisfaction of any and all amounts and benefits to which the Executive has, had, or may have any claim or entitlement to under Sections 11 and 12 of the March 2014 Agreement. Notwithstanding the foregoing, no payments or benefits shall be paid or provided under this Section 5(d) to the extent that the Executive has previously received such payments and/or benefits under the terms of the March 2014 Agreement or otherwise and in no event shall there be any duplication of such payments or benefits. 6. Other Termination Provisions. (a) If the Executive is suspended and/or temporarily prohibited from participating in the conduct of the Bank’s affairs by a notice served under Section 8(e)(3) or (g)(1) of the Federal Deposit Insurance Act (12 U.S.C. § 1818(e)(3) or (g)(1)), the Bank’s obligations under this Agreement shall be suspended as of the date of service unless stayed by appropriate proceedings. If the charges in the notice are dismissed, the Bank shall (but subject in all events to the requirements of Section 409A of the Code and applicable law) (i) pay the Executive all or part of the compensation withheld while its obligations under this Agreement were suspended, and (ii) reinstate (in whole or in part) any of its obligations which were suspended. (b) If the Executive is removed and/or permanently prohibited from participating in the conduct of the Bank’s affairs by an order issued under Section 8(e)(4) or (g)(1) of the Federal Deposit Insurance Act (12 U.S.C. § 1818(e)(4) or (g)(1)), all obligations of the Bank under this Agreement shall terminate as of the effective date of the order. (c) If the Bank is in default (as defined in section 3(x)(1) of the Federal Deposit Insurance Act, 12 U.S.C. 1813(x)(1)), all obligations under this Agreement shall terminate as of the date of default. 7. Non-Solicitation and Non-Competition. (a) Until the date that is the earlier of (x) thirty (30) months after the Closing Date or (y) the date of a Change in Control (and for sake of clarity regardless of whether the Executive’s employment by the Bank and its affiliates has terminated prior to such date and regardless of whether the Executive was eligible for any Severance Payments in connection with any such termination of employment), the Executive will not, without the written consent of the Bank, directly or indirectly: (i) own any interest in, manage, operate, control, be employed by, render consulting or advisory services to, or participate in or be connected with the management or control of any business that is then engaged, or proposing to engage, in the operation of a Competing Business in the Territory. For purposes of this Agreement, “Competing Business” means banking and other financial services businesses, including commercial banks, savings

8 banks, credit unions, mortgage companies, savings and loan associations, trust companies, investment advisory or sales businesses, any similar financial institutions, or any other business in which the Bank or any of its affiliates is engaged, or is contemplating becoming engaged, at the time of termination of the Executive’s employment; and “Territory” means the counties within Pennsylvania in which the Company, the Bank or any of their affiliates conducts operations as of the Effective Date and any other counties in Pennsylvania or other state in which the Company, the Bank or any of their affiliates conducts operations during the period of the Executive’s employment with the Company or the Bank or any of their affiliates; provided, however, that the Executive may, without violating this Agreement, own as a passive investment not in excess of one percent (1%) of the outstanding capital stock or other equity interests of a corporation or other entity whose shares or other equity interests are publicly traded on an established securities market; (ii) influence or attempt to influence any customer of the Bank or any of its affiliates to discontinue its use of the Bank’s (or such affiliate’s) services or to divert such business to any other person, firm or corporation; or (iii) interfere with, disrupt or attempt to disrupt the relationship, contractual or otherwise, between the Bank or any of its affiliates and any of its respective employees, customers, suppliers, principals, distributors, lessors or licensors. Efforts by the Executive, whether direct or indirect, (A) to solicit or assist any other person or entity in soliciting any employee of the Bank or any of its affiliates to perform services for any entity (other than the Bank or any of its affiliates) or (B) to encourage any employee of the Bank, or any of its affiliates to leave their employment with the Bank or any of its affiliates shall be in violation of this Section 7. A person’s response to a broad and general advertisement or solicitation not specifically targeting or intending to target employees of the Bank or any of its affiliates shall not be deemed a violation of this Section 7. (b) In the event the Executive breaches any of the provisions contained in Section 7(a) and the Bank seeks compliance with such provisions by judicial proceedings, the time period during which the Executive is restricted by such provisions shall be extended by the time during which the Executive has actually competed with the Bank or any of its affiliates or been in violation of any such provision and any period of litigation required to enforce the Executive’s obligations under this Agreement. (c) The Executive and the Bank intend that Section 7 of this Agreement be enforced as written. However, if one or more of the provisions contained in Section 7 shall for any reason be held to be unenforceable because of the duration or scope of such provision or the area covered thereby, the Executive and the Bank agree that the court making such determination shall have the full power to reform, by “blue penciling” or any other means, the duration, scope and/or area of such provision and in its reformed form such provision shall then be enforceable and shall be binding on the parties. (d) The provisions of this Section 7 and Sections 8 and 9 shall be immediately effective as of date first written above. The Executive acknowledges and agrees that the Effective Time Bonus, the 2014 Bonus, the right to the Severance Payments (if any) and the other covenants of the Bank hereunder represent adequate and additional consideration for the

9 Executive’s covenants pursuant to Sections 7, 8 and 9. For the avoidance of doubt, in no event shall the provisions of this Section 7 and Sections 8 and 9 apply beyond the date that is thirty (30) months after the Closing Date. 8. Confidentiality; Non-Disclosure. (a) The Executive hereby agrees that, during the Service Period and thereafter, he will hold in strict confidence any proprietary or Confidential Information related to the Bank or any of its affiliates. For purposes of this Agreement, the term “Confidential Information” shall mean all information of the Bank or any of its affiliates (in whatever form) that is not generally known to the public, including without limitation any inventions, processes, methods of distribution, customer lists or trade secrets. (b) The Executive hereby agrees that upon the termination of the Service Period, the Executive shall not take, without the prior written consent of the Bank, any business plans, strategic plans or reports or other document (in whatever form) of the Bank or any of its affiliates, which is of a confidential nature relating to the Bank or any of its affiliates. 9. Injunctive Relief. It is impossible to measure in money the damages that will accrue to the Bank and its affiliates in the event that the Executive breaches any of the restrictive covenants set forth in Sections 7 and 8 (the “Restrictive Covenants”). In the event that the Executive breaches any of the Restrictive Covenants, the Bank shall be entitled to an injunction restraining the Executive from violating such Restrictive Covenant. If the Bank shall institute any action or proceeding to enforce any such Restrictive Covenant, the Executive hereby waives the claim or defense that the Bank or any of its affiliates has an adequate remedy at law and agrees not to assert in any such action or proceeding the claim or defense that the Bank or any of its affiliates has an adequate remedy at law. 10. Miscellaneous. (a) Notwithstanding anything herein to the contrary: (i) any payments made to the Executive pursuant to this Agreement or otherwise are subject to and conditioned upon their compliance with 12 U.S.C. § 1828(k) and 12 C.F.R. Part 359 regarding golden parachute and indemnification payments. (b) This Agreement is intended to comply with the requirements of Section 409A of the Code (including the exceptions thereto), to the extent applicable, and this Agreement shall be interpreted in accordance with such requirements. If any provision contained in the Agreement conflicts with the requirements of Section 409A of the Code (or the exemptions intended to apply under the Agreement), the Agreement shall be deemed to be reformed to comply with the requirements of Section 409A of the Code (or the applicable exemptions thereto). Notwithstanding anything to the contrary herein, for purposes of determining the Executive’s entitlement to the Severance Payments, (i) the Service Period shall not be deemed to have terminated and the Executive’s employment shall not be treated as having terminated unless and until the Executive incurs a “separation from service” as defined in Section 409A of the Code, and (ii) the term “Date of Termination” shall mean the effective date of the Executive’s

10 separation from service. Reimbursement of any expenses provided for in this Agreement shall be made promptly upon presentation of documentation in accordance with the Bank’s policies (as applicable) with respect thereto as in effect from time to time (but in no event later than the end of calendar year following the year such expenses were incurred); provided, however, that in no event shall the amount of expenses eligible for reimbursement hereunder during a calendar year affect the expenses eligible for reimbursement in any other taxable year. Notwithstanding anything to the contrary herein, if a payment or benefit under this Agreement is due to a “separation from service” for purposes of the rules under Treas. Reg. § 1.409A-3(i)(2) (payments to specified employees upon a separation from service) and the Executive is determined to be a “specified employee” (as determined under Treas. Reg. § 1.409A-1(i) and related Bank procedures), such payment shall, to the extent necessary to comply with the requirements of Section 409A of the Code, be made on the later of (x) the date specified by the foregoing provisions of this Agreement or (y) the date that is six (6) months after the date of the Executive’s separation from service (or, if earlier, the date of the Executive’s death). Notwithstanding anything to the contrary herein, to the extent permitted under Section 409A of the Code, each severance payment or benefit provided for herein shall be deemed to be a separate payment for purposes of Section 409A of the Code. Any installment payments that are delayed pursuant to this Section 10(b) shall be accumulated and paid in a lump sum on the first day of the seventh month following the Date of Termination (or, if earlier, upon the Executive’s death) and the remaining installment payments shall begin on such date in accordance with the schedule provided in this Agreement. The Severance Payments are intended not to constitute deferred compensation subject to Section 409A of the Code to the extent such Severance Payments are covered by (i) the “short-term deferral exception” set forth in Treas. Reg. § 1.409A-1(b)(4), (ii) the “two times severance exception” set forth in Treas. Reg. § 1.409A- 1(b)(9)(iii), or (iii) the “limited payments exception” set forth in Treas. Reg. § 1.409A- 1(b)(9)(v)(D). (c) Any notice or other communication required or permitted under this Agreement shall be effective only if it is in writing and shall be deemed to be given when delivered personally or four (4) days after it is mailed by registered or certified mail, postage prepaid, return receipt requested or one day after it is sent by a reputable overnight courier service. All such notices or communications to the Bank shall be sent to the Bank at its primary headquarters office location (to the attention of the Board). All such notices or communications to the Executive shall be sent to the Executive at the Executive’s address as listed on the Bank’s payroll records, or at such other address as the Bank or the Executive may designate by ten (10) days advance written notice to the other. (d) The March 2014 Agreement shall remain in full force and effect, subject to the terms thereof, until the Effective Time, and, other than with respect to the payments provided under Section 5(d) of this Agreement, at the Effective Time shall immediately terminate and be of no force or effect. (e) This Agreement shall constitute the entire agreement between the parties hereto with respect to the subject matter hereof, and supersedes and is in full substitution for any and all prior understandings or agreements with respect to the subject matter hereof; provided, however, that the March 2014 Agreement shall continue in effect to the extent provided in Section 10(d).

11 (f) Section 10(b) of this Agreement is hereby incorporated by reference into the March 2014 Agreement, and the March 2014 Agreement shall be deemed to be amended effective as of the date of this Agreement to include the provisions thereof. For purposes of Section 10(b) as incorporated by reference into the March 2014 Agreement, references to “Severance Benefits shall be deemed to be references to the payments and benefits provided under Section 11 of the March 2014 Agreement and “Service Period” shall be deemed to refer to the Executive’s period of employment under the March 2014 Agreement. (g) Only an instrument in writing signed by the parties hereto may amend this Agreement, and any provision hereof may be waived only by an instrument in writing signed by the party or parties against whom or which enforcement of such waiver is sought. The failure of any party hereto at any time to require the performance by any other party hereto of any provision hereof shall in no way affect the full right to require such performance at any time thereafter, nor shall the waiver by any party hereto of a breach of any provision hereof be taken or held to be a waiver of any succeeding breach of such provision or a waiver of the provision itself or a waiver of any other provision of this Agreement. (h) This Agreement is binding on and is for the benefit of the parties hereto and their respective successors, assigns, heirs, executors, administrators and other legal representatives. Neither this Agreement nor any right or obligation hereunder may be assigned by the Executive. (i) The Bank shall require any successor (whether direct or indirect, by purchase, merger, consolidation or otherwise) to all or substantially all of the business and/or assets of the Bank to assume this Agreement in the same manner and to the same extent that the Bank would have been required to perform it if no such succession had taken place. As used in this Agreement, “Bank” shall mean the Bank and any such successor (or successors) that assumes this Agreement, by operation of law or otherwise. (j) The Bank may withhold from any amounts payable to the Executive hereunder all federal, state, city or other taxes that the Bank may reasonably determine are required to be withheld pursuant to any applicable law or regulation (it being understood, that the Executive shall be responsible for payment of all taxes in respect of the payments and benefits provided herein). (k) This Agreement shall be governed by and construed in accordance with the laws of the Commonwealth of Pennsylvania, without reference to its principles of conflicts of law. (l) This Agreement may be executed in several counterparts, each of which shall be deemed an original, but all of which shall constitute one and the same instrument. A facsimile of a signature shall be deemed to be and have the effect of an original signature. (m) The headings in this Agreement are inserted for convenience of reference only and shall not be a part of or control or affect the meaning of any provision hereof. 11. Certain Definitions.

12 (a) Change in Control. “Change in Control” means the occurrence of any of the following: (i) Any “person” (as such term is used in Sections 13(d) and 14(d) of the Exchange Act in effect on the date first written above), other than a pension, profit-sharing or other employee benefit plan established by S&T or the Bank or any of its affiliates, is or becomes the “beneficial owner” (as defined in Rule 13d- 3 under the Exchange Act in effect as of the date first written above), directly or indirectly, of securities of S&T representing 25% or more of the combined voting power of S&T’s then outstanding securities; (ii) During any period of two consecutive years, individuals who at the beginning of such period constitute the Board of Directors of S&T cease for any reason to constitute at least a majority thereof, unless the election of each director who was not a director at the beginning of such period has been approved in advance by directors representing at least a majority of the directors then in office who were directors at the beginning of the period; (iii) The stockholders of S&T approve a merger or consolidation of S&T with any other corporation, other than a merger or consolidation which would result in the voting securities of S&T outstanding immediately prior thereto continuing to represent (either by remaining outstanding or by being converted into voting securities of the surviving entity) at least fifty percent (50%) of the total voting power represented by the voting securities of S&T or such surviving entity outstanding immediately after such merger or consolidation; (iv) The stockholders of S&T or the Board of Directors of S&T or of the Bank approve a plan of complete liquidation or an agreement for the sale of or disposition (in one transaction or a series of transactions) of all or substantially all of S&T’s or the Bank’s assets; or (v) Any other event that constitutes a change in control of a nature that would be required to be reported by S&T in response to Item 6(e) of Schedule 14A of Regulation 14A promulgated under the Exchange Act or any successor provision (whether or not S&T then in subject to the requirements of the Exchange Act). For sake of clarity, neither the Merger nor any of the transactions contemplated by the Merger Agreement shall constitute a Change in Control. A Change in Control shall exclude a public stock offering by S&T or a convertible debt offering by S&T. (b) Exchange Act. “Exchange Act” means the Securities and Exchange Act of 1934, as amended, or any successor statute. * * * * *

EX-10.2

XML

Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2018	Apr. 30, 2018
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2018
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	Q1
Entity Registrant Name	S&T BANCORP INC
Entity Central Index Key	0000719220
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		35,000,681

XML

Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
ASSETS
Cash and due from banks, including interest-bearing deposits of $67,831 and $61,965 at March 31, 2018 and December 31, 2017	$ 112,849	$ 117,152
Securities, at fair value	687,650	698,291
Loans held for sale	3,283	4,485
Portfolio loans, net of unearned income	5,730,613	5,761,449
Allowance for loan losses	(59,046)	(56,390)
Portfolio loans, net	5,671,567	5,705,059
Bank owned life insurance	72,629	72,150
Premises and equipment, net	41,635	42,702
Federal Home Loan Bank and other restricted stock, at cost	29,769	29,270
Goodwill	287,446	291,670
Other intangible assets, net	3,126	3,677
Other assets	95,375	95,799
Total Assets	7,005,329	7,060,255
Deposits:
Noninterest-bearing demand	1,368,350	1,387,712
Interest-bearing demand	560,711	603,141
Money market	1,239,400	1,146,156
Savings	876,459	893,119
Certificates of deposit	1,342,174	1,397,763
Total Deposits	5,387,094	5,427,891
Securities sold under repurchase agreements	44,617	50,161
Short-term borrowings	525,000	540,000
Long-term borrowings	46,684	47,301
Junior subordinated debt securities	45,619	45,619
Other liabilities	60,908	65,252
Total Liabilities	6,109,922	6,176,224
SHAREHOLDERS’ EQUITY
Common stock ($2.50 par value) Authorized—50,000,000 shares Issued—36,130,480 shares at March 31, 2018 and December 31, 2017 Outstanding— 35,000,502 shares at March 31, 2018 and 34,971,929 shares at December 31, 2017	90,326	90,326
Additional paid-in capital	216,618	216,106
Retained earnings	649,925	628,107
Accumulated other comprehensive (loss) income	(29,953)	(18,427)
Treasury stock (1,129,978 shares at March 31, 2018 and 1,158,551 shares at December 31, 2017, at cost)	(31,509)	(32,081)
Total Shareholders’ Equity	895,407	884,031
Total Liabilities and Shareholders’ Equity	$ 7,005,329	$ 7,060,255

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Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Statement of Financial Position [Abstract]
Cash and due from banks, interest-bearing amounts	$ 67,831	$ 61,965
Common stock, par value (in dollars per share)	$ 2.50	$ 2.50
Common stock, shares authorized (in shares)	50,000,000	50,000,000
Common stock, shares issued (in shares)	36,130,480	36,130,480
Common stock, shares outstanding (in shares)	35,000,502	34,971,929
Treasury stock, shares (in shares)	1,129,978	1,158,551

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Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
INTEREST INCOME
Loans, including fees	$ 63,055	$ 56,900
Investment Securities:
Taxable	3,429	2,848
Tax-exempt	874	920
Dividends	671	482
Total Interest Income	68,029	61,150
INTEREST EXPENSE
Deposits	7,846	5,379
Borrowings and junior subordinated debt securities	3,251	1,893
Total Interest Expense	11,097	7,272
NET INTEREST INCOME	56,932	53,878
Provision for loan losses	2,472	5,183
Net Interest Income After Provision for Loan Losses	54,460	48,695
NONINTEREST INCOME
Net gain (loss) on sale of securities	0	370
Service charges on deposit accounts	3,241	3,014
Debit and credit card	3,037	2,843
Wealth management	2,682	2,403
Gain on sale of a majority interest of insurance business	1,873	0
Mortgage banking	602	733
Insurance	169	1,457
Other	2,188	2,176
Total Noninterest Income	13,792	12,996
NONINTEREST EXPENSE
Salaries and employee benefits	18,815	20,541
Net occupancy	2,873	2,815
Data processing	2,325	2,223
Furniture, equipment and software	1,957	2,047
Other taxes	1,848	976
FDIC insurance	1,108	1,123
Professional services and legal	1,051	1,068
Marketing	702	754
Other	5,403	5,261
Total Noninterest Expense	36,082	36,808
Income Before Taxes	32,170	24,883
Provision for income taxes	6,007	6,695
Net Income	$ 26,163	$ 18,188
Earnings per share—basic (in dollars per share)	$ 0.75	$ 0.52
Earnings per share—diluted (in dollars per share)	0.75	0.52
Dividends declared per share (in dollars per share)	$ 0.22	$ 0.20
Comprehensive Income	$ 14,637	$ 19,376

XML

Consolidated Statements of Changes in Shareholders' Equity (Unaudited) - USD ($) $ in Thousands		Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive (Loss)/Income	Reclassifications Related to Funded Status of Pension	Reclassifications Related to Unrealized Gains on Available for Sale Securities	Treasury Stock
Beginning Balance at Dec. 31, 2016		$ 841,956	$ 90,326	$ 213,098	$ 585,891	$ (13,784)			$ (33,575)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		18,188			18,188
Other comprehensive income (loss), net of tax		1,188				1,188
Cash dividends declared ($0.22 and $0.20) (in dollars per share)		(6,960)			(6,960)
Treasury stock issued for restricted awards (66,615 shares, net of 37,592 forfeitures, and 74,903 shares, net of 7,370 forfeitures)		(194)			(2,014)				1,820
Recognition of restricted stock compensation expense		1,002		1,002
Ending Balance at Mar. 31, 2017		855,180	90,326	214,100	595,105	(12,596)			(31,755)
Beginning Balance at Dec. 31, 2017		884,031	90,326	216,106	628,107	(18,427)			(32,081)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		26,163			26,163
Other comprehensive income (loss), net of tax		(6,973)				(6,973)
Reclassification of tax effects from the Tax Act		(3,700)
Reclassification of tax effects from the Tax Act | Accounting Standards Update 2018-02	[1]				3,691	(3,691)	$ (3,924)	$ 233
Cash dividends declared ($0.22 and $0.20) (in dollars per share)		(7,669)			(7,669)
Treasury stock issued for restricted awards (66,615 shares, net of 37,592 forfeitures, and 74,903 shares, net of 7,370 forfeitures)		(657)			(1,229)				572
Recognition of restricted stock compensation expense		512		512
Ending Balance at Mar. 31, 2018		$ 895,407	$ 90,326	$ 216,618	$ 649,925	$ (29,953)			$ (31,509)

[1] Reclassification due to the adoption of ASU No. 2018-02 - $(3,924) relates to funded status of pension and $233 relates to net unrealized gains on available-for-sale securities.

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Consolidated Statements of Changes in Shareholders' Equity (Unaudited) (Parenthetical) - $ / shares	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Statement of Stockholders' Equity [Abstract]
Dividends declared per share (in dollars per share)	$ 0.22	$ 0.20
Treasury stock issued for restricted awards, net of forfeitures (in shares)	66,615	74,903
Forfeitures of restricted stock (in shares)	37,592	7,370

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Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
OPERATING ACTIVITIES
Net income	$ 26,163	$ 18,188
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for loan losses	2,472	5,183
Recovery for unfunded loan commitments	(71)	(458)
Net depreciation, amortization and accretion	1,017	369
Net amortization of discounts and premiums on securities	796	1,030
Stock-based compensation expense	512	1,002
Securities gains, net	0	(370)
Mortgage loans originated for sale	(16,827)	(15,694)
Proceeds from the sale of mortgage loans	18,326	16,575
Gain on the sale of mortgage loans, net	(296)	(193)
Gain on the sale of majority interest of insurance business	(1,873)	0
Net (increase) decrease in interest receivable	336	(62)
Net decrease in interest payable	(720)	(435)
Net decrease in other assets	4,120	3,404
Net increase in other liabilities	3,836	1,768
Net Cash Provided by Operating Activities	37,791	30,307
INVESTING ACTIVITIES
Purchases of securities	(27,565)	(36,604)
Proceeds from maturities, prepayments and calls of securities	22,104	16,942
Proceeds from sales of securities	0	582
Net (purchases) sales of Federal Home Loan Bank stock	(499)	2,078
Net decrease (increase) in loans	27,717	(151,438)
Proceeds from sale of loans not originated for resale	2,060	2,657
Purchases of premises and equipment	(309)	(745)
Proceeds from the sale of premises and equipment	109	16
Proceeds from the sale of majority interest of insurance business	4,540	0
Net Cash Provided by (Used in) Investing Activities	28,157	(166,512)
FINANCING ACTIVITIES
Net increase in core deposits	14,793	62,219
Net (decrease) increase in certificates of deposit	(55,557)	100,799
Net decrease in securities sold under repurchase agreements	(5,544)	(3,845)
Net increase in short-term borrowings	(15,000)	(50,000)
Repayments of long-term borrowings	(617)	(595)
Treasury shares issued-net	(657)	(194)
Cash dividends paid to common shareholders	(7,669)	(6,960)
Net Cash (Used in) Provided by Financing Activities	(70,251)	101,424
Net decrease in cash and cash equivalents	(4,303)	(34,781)
Cash and cash equivalents at beginning of period	117,152	139,486
Cash and Cash Equivalents at End of Period	112,849	104,705
Supplemental Disclosures
Loans transferred to held for sale	2,060	0
Loans transferred to portfolio from held for sale	0	250
Interest paid	11,817	7,706
Income taxes paid, net of refunds	108	172
Transfer net assets to investment in insurance company partnership	1,917	0
Transfers to other real estate owned and other repossessed assets	$ 2,599	$ 397

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Basis of Presentation

3 Months Ended

Mar. 31, 2018

Accounting Policies [Abstract]

BASIS OF PRESENTATION

BASIS OF PRESENTATION

Principles of Consolidation

The interim Consolidated Financial Statements include the accounts of S&T Bancorp, Inc., or S&T, and its wholly owned subsidiaries. All significant intercompany transactions have been eliminated in consolidation. Investments of 20 percent to 50 percent of the outstanding common stock of investees are accounted for using the equity method of accounting.

Basis of Presentation

The accompanying unaudited interim Consolidated Financial Statements of S&T have been prepared in accordance with generally accepted accounting principles, or GAAP, in the United States for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by GAAP for complete financial statements and should be read in conjunction with the audited consolidated financial statements included in our annual report on Form 10-K for the year ended December 31, 2017, filed with the Securities and Exchange Commission, or SEC, on March 1, 2018. In the opinion of management, the accompanying interim financial information reflects all adjustments, consisting of normal recurring adjustments, necessary to present fairly our financial position and the results of operations for each of the interim periods presented. Results of operations for interim periods are not necessarily indicative of the results of operations that may be expected for a full year or any future period.

On January 1, 2018, we sold a 70 percent majority interest in the assets of our wholly-owned subsidiary S&T Evergreen Insurance, LLC. We transferred our remaining ownership interest in the net assets of S&T Evergreen Insurance, LLC for a 30 percent ownership interest in a new partnership entity. We will use the equity-method of accounting to recognize our partial ownership interest in the new entity.

Reclassification

Amounts in prior period financial statements and footnotes are reclassified whenever necessary to conform to the current period presentation. Reclassifications had no effect on our results of operations or financial condition.

Use of Estimates

The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosures of contingent assets and liabilities at the date of the financial statements. Actual results could differ from those estimates.

Recently Adopted Accounting Standards Updates, or ASU or Update

Income Taxes - Amendments to SEC Paragraphs Pursuant to SEC Staff Accounting Bulletin No. 118

In March 2018, the FASB issued ASU No. 2018-05 Income Taxes - Amendments to SEC Paragraphs Pursuant to SEC Staff Accounting Bulletin No. 118. The amendments in this ASU add various SEC paragraphs pursuant to the issuance of the SEC Staff Accounting Bulletin to the Accounting Standards Codification Subtopic 740-10. We adopted the amendments in this ASU in conjunction with ASU 2018-02 Reclassification of Certain Tax Effects from AOCI. This ASU had no impact to our Balance Sheets or Statements of Comprehensive Income.

Investments - Debt Securities and Regulated Operations - Amendments to SEC Paragraphs Pursuant to SEC Staff Accounting Bulletin No. 117 and SEC Release No. 33-9273

In March 2018, the FASB issued ASU No. 2018-04 Investments - Debt Securities and Regulated Operations - Amendments to SEC Paragraphs Pursuant to SEC Staff Accounting Bulletin No. 117 and SEC Release No. 33-9273. The amendments in this ASU add various SEC paragraphs pursuant to the issuance of the SEC Staff Accounting Bulletin to the Accounting Standards Codification Subtopics 320 and 980. We adopted the amendments in this ASU in conjunction with ASU 2016-01 as it relates to equity securities.

Income Statement -- Reporting Comprehensive Income - Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income

In February 2018, the FASB issued ASU No. 2018-02, Income Statement - Reporting Comprehensive Income (Topic 220), Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income. The amendments in this Update allow a reclassification from accumulated other comprehensive income to retained earnings for stranded tax effects resulting from the Tax Cuts and Jobs Act, or Tax Act. The amendments eliminate the stranded tax effects resulting from the Tax Act and will improve the usefulness of information reported to financial statement users and will require certain disclosures about the stranded tax effects. This Update is effective for all entities for fiscal years beginning after December 15, 2018 and interim periods within those fiscal years. Early adoption is permitted, including adoption in any interim period, for public business entities for reporting periods for which financial statements have not been issued or made available for issuance. We have elected to reclassify all tax effects related to the Tax Act from accumulated other comprehensive income, or AOCI, to retained earnings as of January 1, 2018. As such, we have early adopted this Update and reclassified $3.7 million for the release of stranded income tax effects relating to unrealized gains and losses on our securities portfolio and our pension plan from AOCI, to retained earnings as of March 31, 2018. The adoption of this ASU had no impact on our Statements of Comprehensive Income. Our policy for releasing income tax effects from AOCI is to release them as investments are sold or mature and liabilities are extinguished.

Compensation - Retirement Benefits - Improving the Presentation of Net Periodic Pension Costs and Net Periodic Post Retirement Benefit Costs

In March 2017, the FASB issued ASU No. 2017-07, Compensation Retirement Benefits - Improving the Presentation of Net Periodic Pension Costs and Net Periodic Post Retirement Benefit Costs (Topic 715). The main objective of this ASU is to provide financial statement users with clearer and disaggregated information related to the components of net periodic benefit cost and improve transparency of the presentation of net periodic benefit cost in the financial statements. This Update is effective for interim and annual reporting periods in fiscal years beginning after December 15, 2017. Early adoption is permitted as of the beginning of an annual period for which financial statements have not been issued or made available for issuance. Effective March 31, 2016, our qualified and nonqualified defined benefit plans were amended to freeze benefit accruals for all persons entitled to benefits under the plan; as such, the adoption of this ASU had no impact on our Consolidated Balance Sheets or Consolidated Statements of Comprehensive Income.

Other Income - Gains and Losses from the Derecognition of Nonfinancial Assets - Clarifying the Scope of Assets Derecognition Guidance and Accounting for Partial Sales of Nonfinancial Assets

In February 2017, the FASB issued ASU No. 2017-05, Other Income - Gains and Losses from the Derecognition of Nonfinancial Assets (Subtopic 610-20). The main objective of this ASU is intended to provide greater detail on what types of transactions should be accounted for as partial sales of nonfinancial assets. The scope of this ASU, as originally issued in ASU No. 2014-09, is intended to reduce the complexity of current GAAP requirements by clarifying which accounting guidance applies to various types of contracts that transfer assets or ownership interest to another entity. This Update was effective for interim and annual reporting periods in fiscal years beginning after December 15, 2017 and at the same time that ASU No. 2014-09 was effective. Early adoption was permitted, but only as of annual reporting periods beginning after December 15, 2016, including interim reporting periods within that reporting period. The adoption of this ASU was applied to the partial sale of our insurance subsidiary. As such, the subsidiary is no longer included in our consolidated financial statements and we recognized a $1.9 million gain on the transaction.

Business Combinations - Clarifying the Definition of a Business

In January 2017, the FASB issued ASU No. 2017-01, Business Combinations - Clarifying the Definition of a Business (Topic 805). The main objective of this ASU is to help financial statement preparers evaluate whether a set of transferred assets and activities (either acquired or disposed of) is a business under Topic 805, Business Combinations by changing the definition of a business. The revised definition will result in fewer acquisitions being accounted for as business combinations than under existing guidance. The definition of a business is significant because it affects the accounting for acquisitions, the identification of reporting units, consolidation evaluations and the accounting for dispositions. This Update was effective for interim and annual reporting periods in fiscal years beginning after December 15, 2017. Early adoption was permitted for transactions not yet reflected in financial statements that have been issued or made available for issuance. The adoption of this ASU had no impact on our Balance Sheets or Statements of Comprehensive Income.

Income Taxes - Intra-Entity Transfers of Assets Other Than Inventory

In October 2016, the FASB issued ASU No. 2016-16, Intra-Entity Transfers of Assets Other Than Inventory. The main objective of this ASU is to require companies to recognize the income tax effects of intercompany sales and transfers of assets other than inventory in the period in which the transfer occurs. This represents a change from existing guidance, which requires companies to defer the income tax effects of intercompany transfers of assets until the asset has been sold to an outside party or otherwise recognized. The new guidance will require companies to defer the income tax effects only of intercompany transfers of inventory. This Update is effective for annual periods beginning after December 15, 2017. Early adoption is permitted as of the beginning of an annual period. If an entity chooses to early adopt the amendments in the ASU, it must do so in the first interim period of its annual financial statements. That is, an entity cannot adopt the amendments in the ASU in a later interim period and apply them as if they were in effect as of the beginning of the year. The adoption of this ASU had no impact on our Balance Sheets or Statements of Comprehensive Income.

Statement of Cash Flows - Classification of Certain Cash Receipts and Cash Payments

In August 2016, the FASB issued ASU No. 2016-15, Classification of Certain Cash Receipts and Cash Payments. The main objective of this ASU is to reduce diversity in practice in how certain transactions are classified in the statement of cash flows. The amendments in this Update provide guidance on the following eight specific cash flow issues: debt prepayment or debt extinguishment costs, settlement of zero-coupon debt instruments, contingent consideration payments made after a business combination, proceeds from the settlement of insurance claims, proceeds from the settlement of bank-owned life insurance (BOLI) policies, distributions received from equity method investments, beneficial interests in securitization transactions, and separately identifiable cash flows and application of the predominance principle. This Update was effective for interim and annual reporting periods in fiscal years beginning after December 15, 2017. Early adoption was permitted, provided that all of the amendments are adopted in the same period. The adoption of this ASU had no material impact to the presentation of activities in our Statements of Cash Flows.

Revenue from Contracts with Customers

In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers (Topic 606). The new revenue pronouncement creates a single source of revenue guidance for all companies in all industries and is more principles-based than current revenue guidance. The pronouncement provides a five-step model for a company to recognize revenue when it transfers control of goods or services to customers at an amount that reflects the consideration to which it expects to be entitled in exchange for those goods or services. The five steps are: 1. identify the contract with the customer; 2. identify the separate performance obligations in the contract; 3. determine the transaction price; 4. allocate the transaction price to the separate performance obligations; and 5. recognize revenue when each performance obligation is satisfied. In August 2015, the FASB issued ASU No. 2015-14, Revenue from Contracts with Customers (Topic 606): Deferral of the Effective Date. This ASU defers the effective date of ASU No. 2014-09 for all entities by one year.

In March 2016, the FASB issued ASU No. 2016-08, Principal versus Agent Considerations (Reporting Revenue Gross versus Net), as an amendment to ASU No. 2014-09 to improve Topic 606, Revenue from Contracts with Customers, by reducing: 1. the potential for diversity in practice arising from inconsistent application of the principal versus agent guidance, and; 2. the cost and complexity of applying Topic 606 both at transition and on an ongoing basis.

In April 2016, the FASB issued ASU No. 2016-10, Identifying Performance Obligations and Licensing, as an amendment to ASU No. 2014-09 to improve Topic 606, Revenue from Contracts with Customers, by reducing: 1. the potential for diversity in practice at initial application and; 2. the cost and complexity of applying Topic 606 both at transition and on an ongoing basis.

In May 2016, the FASB issued ASU No. 2016-12, Narrow-scope Improvements and Practical Expedients. The amendments in this ASU do not change the core principles of Topic 606, Revenue from Contracts with Customers. These amendments affect only the narrow aspects of Topic 606: 1. Collectibility Criterion; 2. Presentation of Sales Taxes and Other Similar Taxes Collected from Customers; 3. Noncash Consideration; 4. Contract Modifications at Transition and; 5. Completed Contracts at Transition.

ASU 2014-09, including transition requirements for all amendments, was effective for interim and annual reporting periods in fiscal years beginning after December 15, 2017. Early adoption was permitted as of the original effective date for interim and annual reporting periods in fiscal years beginning after December 15, 2016. As of January 1, 2018, we adopted ASU 2014-09 Revenue from Contracts with Customers — Topic 606 and all subsequent ASUs that modified Topic 606. The ASU requires that we identify the contract with a customer, identity the performance obligations in the contract, determine the transaction price, allocate the transaction price to the performance obligations in the contract and recognize revenue when we satisfy a performance obligation. We generally satisfy our performance obligations on our contracts with customers as services are rendered and the transaction prices are typically fixed; charged whether on a periodic basis or based on activity. Because performance obligations are satisfied as services are rendered and the transaction prices are fixed, there is little judgment involved in applying Topic 606 that significantly affects the determination of the amount and timing of revenue from contracts with customers.

Significant revenue has not been recognized in the current reporting period that results from performance obligations satisfied in previous periods. The implementation guidance had no material impact on the measurement or timing of revenue recognition.

Our primary sources of revenue are derived from interest and dividends earned on loans, investment securities and other financial instruments that are not within the scope of Topic 606. We have evaluated the nature of our contracts with customers and related revenue streams, including services charges on deposit accounts, debit and credit cards and wealth management and determined that further disaggregation of revenue from contracts with customers into more granular categories beyond what is presented in the Consolidated Statements of Comprehensive Income was not necessary. We have also completed our evaluation of certain costs related to these revenue streams to determine whether such costs should be presented as expenses or contra-revenue. The adoption of this ASU had no material impact on our Balance Sheets or Statements of Comprehensive Income.

Accounting for Financial Instruments - Overall: Classification and Measurement

In January 2016, the FASB issued ASU No. 2016-01, Accounting for Financial Instruments - Overall: Classification and Measurement (Subtopic 825-10). The amendments in this ASU address the following: 1. require equity investments to be measured at fair value with changes in fair value recognized in net income; 2. simplify the impairment assessment of equity investments without readily-determinable fair values by requiring a qualitative assessment to identify impairment; 3. eliminate the requirement to disclose the method(s) and significant assumptions used to estimate the fair value that is required to be disclosed for financial instruments measured at amortized cost on the balance sheet; 4. require entities to use the exit price notion when measuring the fair value of financial instruments for disclosure purposes; 5. require separate presentation in other comprehensive income for the portion of the total change in the fair value of a liability resulting from a change in the instrument-specific credit risk when the entity has elected to measure the liability at fair value in accordance with the fair value option for financial instruments; 6. require separate presentation of financial assets and financial liabilities by measurement category and form of financial asset (that is, securities or loans and receivables) on the balance sheet or in the accompanying notes to the financial statements; and 7. clarify that an entity should evaluate the need for a valuation allowance on a deferred tax asset related to available-for-sale securities in combination with the entity's other deferred tax assets. This ASU was effective for annual and interim periods in fiscal years beginning after December 15, 2017. We adopted ASU No. 2016-01 January 1, 2018 and have concluded that the provisions of this ASU did not materially impact our Balance Sheets or Statements of Comprehensive Income. The new guidance resulted in a change in the fair value measurement of our loan portfolio as of March 31, 2018 using an exit price notion (see Note 3: Fair Value Measurements). The new guidance also resulted in a cumulative-effect adjustment of $0.9 million from AOCI, to retained earnings at January 1, 2018 for net unrealized gains on our marketable equities portfolio. As a result of the new guidance we recognized $0.1 million of net unrealized gains in our Statements of Comprehensive Income during the three months ended March 31, 2018 on our marketable equity securities portfolio.

Recently Issued Accounting Standards

Leases - Land Easement Practical Expedient for Transition to Topic 842

In January 2018, the FASB issued ASU No. 2018-01 Leases - Land Easement Practical Expedient for Transition to Topic 842. The amendments in this ASU permit an entity to elect an optional transition practical expedient to not evaluate under Topic 842 land easements, that exist or expired before the entity's adoption of Topic 842 and that were not previously accounted for as leases under Topic 840. We are evaluating the amendments in this ASU; however, we do not anticipate that these amendments will materially impact to our Balance Sheets or Statements of Comprehensive Income.

Intangibles - Goodwill and Other - Simplifying the Test for Goodwill Impairment

In January 2017, the FASB issued ASU No. 2017-04, Intangibles - Goodwill and Other - Simplifying the Test for Goodwill Impairment (Topic 350). The main objective in this ASU is intended to simplify the current requirements for testing goodwill for impairment by eliminating step two from the goodwill impairment test. The amendments are expected to reduce the complexity and costs associated with performing the goodwill impairment test, which could result in recording impairment charges sooner than under the current guidance. This Update is effective for any interim and annual impairment tests in reporting periods in fiscal years beginning after December 15, 2019. Early adoption is permitted for interim or annual goodwill impairment tests performed on testing dates after January 1, 2017. We are evaluating the provisions of this ASU; however, we do not anticipate that this ASU will materially impact our Balance Sheets or Statements of Comprehensive Income.

Financial Instruments - Credit Losses

In June 2016, the FASB issued ASU No. 2016-13, Measurement of Credit Losses on Financial Instruments. The main objective of this ASU is to provide financial statement users with more decision-useful information about the expected credit losses on financial instruments and other commitments to extend credit held by a reporting entity at each reporting date. The amendments of this Update replace the incurred loss impairment methodology in current GAAP with a methodology that reflects expected credit losses and requires consideration of a broader range of reasonable and supportable information to inform credit loss estimates. The collective changes to the recognition and measurement accounting standards for financial instruments and their anticipated impact on the allowance for credit losses modeling have been universally referred to as the CECL, or current expected credit loss, model. This Update is effective for interim and annual reporting periods in fiscal years beginning after December 15, 2019. Early adoption is permitted as of fiscal years beginning after December 15, 2018, including interim periods within those fiscal years. We have created a CECL Committee to govern the implementation of these amendments consisting of key stakeholders from Credit Administration, Finance, Risk Management and Audit. We have engaged a third-party to assist us in developing our CECL methodology. We continue to evaluate the provisions of this ASU to determine the potential impact on our Balance Sheets and Statements of Comprehensive Income.

Leases - Section A-Amendments to the FASB Accounting Standards Codification, Section B-Conforming Amendments Related to Leases and Section C-Background Information and Basis for Conclusions

In February 2016, the FASB issued ASU No. 2016-02, Leases, which requires lessees to recognize a right-to-use asset and a lease obligation for all leases on the balance sheet. Lessor accounting remains substantially similar to current GAAP. ASU 2016-02 supersedes Topic 840, Leases. This ASU is effective for annual and interim periods in fiscal years beginning after December 15, 2018. ASU 2016-02 mandates a modified retrospective transition method for all entities. Early adoption of this ASU is permitted. We anticipate that this ASU will impact our financial statements as it relates to the recognition of right-to-use assets and lease obligations on our Consolidated Balance Sheets. We have numerous lease agreements for our branch and loan production offices, which are currently accounted for as operating leases. We expect the new guidance will require these lease agreements to be included on our Balance Sheets as right-to-use assets with a corresponding lease liability. We expect that these changes to our Balance Sheets will impact our regulatory capital ratios. We have compiled a preliminary inventory of our leases and continue to evaluate the standard. We anticipate that this ASU will impact total assets and total liabilities presented on our Balance Sheets; however, we do not believe that it will materially impact our Statements of Comprehensive Income.

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Earnings Per Share

3 Months Ended

Mar. 31, 2018

Earnings Per Share [Abstract]

EARNINGS PER SHARE

The following table reconciles the numerators and denominators of basic and diluted earnings per share for the periods presented:

	Three Months Ended March 31,
(in thousands, except share and per share data)	2018		2017
Numerator for Earnings per Share—Basic:
Net income	$	26,163	$	18,188
Less: Income allocated to participating shares	80		60
Net Income Allocated to Shareholders	$	26,083	$	18,128
Numerator for Earnings per Share—Diluted:
Net income	$	26,163	$	18,188
Net Income Available to Shareholders	$	26,163	$	18,188
Denominators for Earnings per Share:
Weighted Average Shares Outstanding—Basic	34,756,726		34,690,250
Add: Potentially dilutive shares	242,439		222,011
Denominator for Treasury Stock Method—Diluted	34,999,165		34,912,261
Weighted Average Shares Outstanding—Basic	34,756,726		34,690,250
Add: Average participating shares outstanding	106,722		115,395
Denominator for Two-Class Method—Diluted	34,863,448		34,805,645
Earnings per share—basic	$	0.75	$	0.52
Earnings per share—diluted	$	0.75	$	0.52
Warrants considered anti-dilutive excluded from potentially dilutive shares - exercise price $31.53 per share, expires January 2019	400,722		447,103
Restricted stock considered anti-dilutive excluded from potentially dilutive shares	90,298		79,544

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Fair Value Measurement

3 Months Ended

Mar. 31, 2018

Fair Value Disclosures [Abstract]

FAIR VALUE MEASUREMENT

We use fair value measurements when recording and disclosing certain financial assets and liabilities. Debt securities, equity securities, trading assets and derivative financial instruments are recorded at fair value on a recurring basis. Additionally, from time to time, we may be required to record other assets at fair value on a nonrecurring basis, such as loans held for sale, impaired loans, other real estate owned, or OREO, and other repossessed assets, mortgage servicing rights, or MSRs, and certain other assets.

Fair value is the price that would be received to sell an asset or paid to transfer a liability in the principal or most advantageous market in an orderly transaction between market participants at the measurement date. An orderly transaction is a transaction that assumes exposure to the market for a period prior to the measurement date to allow for marketing activities that are usual and customary for transactions involving such assets or liabilities; it is not a forced transaction. In determining fair value, we use various valuation approaches, including market, income and cost approaches. The fair value standard establishes a hierarchy for inputs used in measuring fair value that maximizes the use of observable inputs and minimizes the use of unobservable inputs by requiring that observable inputs be used when available. Observable inputs are inputs that market participants would use in pricing an asset or liability, which are developed based on market data that we have obtained from independent sources. Unobservable inputs reflect our estimates of assumptions that market participants would use in pricing an asset or liability, which are developed based on the best information available in the circumstances.

The fair value hierarchy gives the highest priority to unadjusted quoted market prices in active markets for identical assets or liabilities (Level 1 measurement) and the lowest priority to unobservable inputs (Level 3 measurement). The fair value hierarchy is broken down into three levels based on the reliability of inputs as follows:

Level 1: valuation is based upon unadjusted quoted market prices for identical instruments traded in active markets.

Level 2: valuation is based upon quoted market prices for similar instruments traded in active markets, quoted market prices for identical or similar instruments traded in markets that are not active and model-based valuation techniques for which all significant assumptions are observable in the market or can be corroborated by market data.

Level 3: valuation is derived from other valuation methodologies, including discounted cash flow models and similar techniques that use significant assumptions not observable in the market. These unobservable assumptions reflect estimates of assumptions that market participants would use in determining fair value.

A financial instrument’s level within the fair value hierarchy is based on the lowest level of input that is significant to the fair value measurement. Our policy is to recognize transfers between any of the fair value hierarchy levels at the end of the reporting period in which the transfer occurred.

The following are descriptions of the valuation methodologies that we use for financial instruments recorded at fair value on either a recurring or nonrecurring basis.

Recurring Basis

Debt Securities Available-for-Sale

We obtain fair values for debt securities from a third-party pricing service which utilizes several sources for valuing fixed-income securities. We validate prices received from our pricing service through comparison to a secondary pricing service and broker quotes. We review the methodologies of the pricing service which provides us with a sufficient understanding of the valuation models, assumptions, inputs and pricing to reasonably measure the fair value of our debt securities. The market evaluation sources for debt securities include observable inputs rather than significant unobservable inputs and are classified as Level 2. The service provider utilizes pricing models that vary by asset class and include available trade, bid and other market information. Generally, the methodologies include broker quotes, proprietary models, and vast descriptive terms and conditions databases, and extensive quality control programs.

Equity Securities

Marketable equity securities that have an active, quotable market are classified as Level 1. Marketable equity securities that are quotable, but are thinly traded or inactive, are classified as Level 2. Marketable equity securities that are not readily traded and do not have a quotable market are classified as Level 3.

Trading Assets

We use quoted market prices to determine the fair value of our trading assets. Our trading assets are held in a Rabbi Trust under a deferred compensation plan and are invested in readily quoted mutual funds. Accordingly, these assets are classified as Level 1. Rabbi Trust assets are reported in other assets in the Consolidated Balance Sheets.

Derivative Financial Instruments

We use derivative instruments, including interest rate swaps for commercial loans with our customers, interest rate lock commitments and the sale of mortgage loans in the secondary market. We calculate the fair value for derivatives using widely accepted valuation techniques, including discounted cash flow analysis on the expected cash flows of each derivative. Each valuation considers the contractual terms of the derivative, including the period to maturity, and uses observable market-based inputs, such as interest rate curves and implied volatilities. Accordingly, derivatives are classified as Level 2. We incorporate credit valuation adjustments into the valuation models to appropriately reflect both our own nonperformance risk and the respective counterparties' nonperformance risk in calculating fair value measurements. In adjusting the fair value of our derivative contracts for the effect of nonperformance risk, we have considered the impact of netting and any applicable credit enhancements and collateral postings.

Nonrecurring Basis

Loans Held for Sale

Loans held for sale consist of 1-4 family residential loans originated for sale in the secondary market and, from time to time, certain loans transferred from the loan portfolio to loans held for sale, all of which are carried at the lower of cost or fair value. The fair value of 1-4 family residential loans is based on the principal or most advantageous market currently offered for similar loans using observable market data. The fair value of the loans transferred from the loan portfolio is based on the amounts offered for these loans in currently pending sales transactions. Loans held for sale carried at fair value are classified as Level 3.

Impaired Loans

Impaired loans are carried at the lower of carrying value or fair value. Fair value is determined as the recorded investment balance less any specific reserve. We establish specific reserves based on the following three impairment methods: 1) the present value of expected future cash flows discounted at the loan’s original effective interest rate; 2) the loan’s observable market price; or 3) the fair value of the collateral less estimated selling costs when the loan is collateral dependent and we expect to liquidate the collateral. However, if repayment is expected to come from the operation of the collateral, rather than liquidation, then we do not consider estimated selling costs in determining the fair value of the collateral. Collateral values are generally based upon appraisals by approved, independent state certified appraisers. Appraisals may be discounted based on our historical knowledge, changes in market conditions from the time of appraisal or our knowledge of the borrower and the borrower’s business. Impaired loans carried at fair value are classified as Level 3.

OREO and Other Repossessed Assets

OREO and other repossessed assets obtained in partial or total satisfaction of a loan are recorded at the lower of recorded investment in the loan or fair value less cost to sell. Subsequent to foreclosure, these assets are carried at the lower of the amount recorded at acquisition date or fair value less cost to sell. Accordingly, it may be necessary to record nonrecurring fair value adjustments. Fair value, when recorded, is generally based upon appraisals by approved, independent state certified appraisers. Like impaired loans, appraisals on OREO may be discounted based on our historical knowledge, changes in market conditions from the time of appraisal or other information available to us. OREO and other repossessed assets carried at fair value are classified as Level 3.

Mortgage Servicing Rights

The fair value of MSRs is determined by calculating the present value of estimated future net servicing cash flows, considering expected mortgage loan prepayment rates, discount rates, servicing costs and other economic factors, which are determined based on current market conditions. The expected rate of mortgage loan prepayments is the most significant factor driving the value of MSRs. MSRs are considered impaired if the carrying value exceeds fair value. The valuation model includes significant unobservable inputs; therefore, MSRs are classified as Level 3. MSRs are reported in other assets in the Consolidated Balance Sheets and are amortized into noninterest income in the Consolidated Statements of Comprehensive Income.

Other Assets

We measure certain other assets at fair value on a nonrecurring basis. Fair value is based on the application of lower of cost or fair value accounting, or write-downs of individual assets. Valuation methodologies used to measure fair value are consistent with overall principles of fair value accounting and consistent with those described above.

Financial Instruments

In addition to financial instruments recorded at fair value in our financial statements, fair value accounting guidance requires disclosure of the fair value of all of an entity’s assets and liabilities that are considered financial instruments. The majority of our assets and liabilities are considered financial instruments. Many of these instruments lack an available trading market as characterized by a willing buyer and willing seller engaged in an exchange transaction. Also, it is our general practice and intent to hold our financial instruments to maturity and to not engage in trading or sales activities with respect to such financial instruments. For fair value disclosure purposes, we substantially utilize the fair value measurement criteria as required and explained above. In cases where quoted fair values are not available, we use present value methods to determine the fair value of our financial instruments.

Cash and Cash Equivalents

The carrying amounts reported in the Consolidated Balance Sheets for cash and due from banks, including interest-bearing deposits, approximate fair value.

Loans

With the adoption of ASU 2016-01 on January 1, 2018, we refined our methodology to estimate the fair value of our loan portfolio to use the exit price notion as required by the standard. The guidance was applied on a prospective basis resulting in prior-periods no longer being comparable.

The fair value of variable rate loans that may reprice frequently at short-term market rates is based on carrying values adjusted for liquidity and credit risk. The fair value of variable rate loans that reprice at intervals of one year or longer, such as adjustable rate mortgage products, is estimated using discounted cash flow analyses that utilize interest rates currently being offered for similar loans and adjusted for liquidity and credit risk. The fair value of fixed rate loans is estimated using a discounted cash flow analysis that utilizes interest rates currently being offered for similar loans adjusted for liquidity and credit risk.

Bank Owned Life Insurance

Fair value approximates net cash surrender value of bank owned life insurance, or BOLI.

Federal Home Loan Bank, or FHLB, and Other Restricted Stock

It is not practical to determine the fair value of our FHLB and other restricted stock due to the restrictions placed on the transferability of these stocks; it is presented at carrying value.

Deposits

The fair values disclosed for deposits without defined maturities (e.g., noninterest and interest-bearing demand, money market and savings accounts) are by definition equal to the amounts payable on demand. The carrying amounts for variable rate, fixed-term time deposits approximate their fair values. Estimated fair values for fixed rate and other time deposits are based on discounted cash flow analysis using interest rates currently offered for time deposits with similar terms. The carrying amount of accrued interest approximates fair value.

Short-Term Borrowings

The carrying amounts of securities sold under repurchase agreements, or REPOs, and other short-term borrowings approximate their fair values.

Long-Term Borrowings

The fair values disclosed for fixed rate long-term borrowings are determined by discounting their contractual cash flows using current interest rates for long-term borrowings of similar remaining maturities. The carrying amounts of variable rate long-term borrowings approximate their fair values.

Junior Subordinated Debt Securities

The interest rate on the variable rate junior subordinated debt securities is reset quarterly; therefore, the carrying values approximate their fair values.

Loan Commitments and Standby Letters of Credit

Off-balance sheet financial instruments consist of commitments to extend credit and letters of credit. Except for interest rate lock commitments, estimates of the fair value of these off-balance sheet items are not made because of the short-term nature of these arrangements and the credit standing of the counterparties.

Other

Estimates of fair value are not made for items that are not defined as financial instruments, including such items as our core deposit intangibles and the value of our trust operations.

Assets and Liabilities Recorded at Fair Value on a Recurring Basis

The following tables present our assets and liabilities that are measured at fair value on a recurring basis by fair value hierarchy level at March 31, 2018 and December 31, 2017. There were no transfers between Level 1 and Level 2 for items measured at fair value on a recurring basis during the periods presented.

	March 31, 2018
(dollars in thousands)	Level 1		Level 2		Level 3		Total
ASSETS
Debt securities available-for-sale:
U.S. Treasury securities	$	—	$	14,661	$	—	$	14,661
Obligations of U.S. government corporations and agencies	—		160,589		—		160,589
Collateralized mortgage obligations of U.S. government corporations and agencies	—		102,582		—		102,582
Residential mortgage-backed securities of U.S. government corporations and agencies	—		30,683		—		30,683
Commercial mortgage-backed securities of U.S. government corporations and agencies	—		248,798		—		248,798
Obligations of states and political subdivisions	—		125,141		—		125,141
Total Debt Securities Available-for-Sale	—		682,454		—		682,454
Marketable equity securities(1)	—		5,196		—		5,196
Total Securities	—		687,650		—		687,650
Trading securities held in a Rabbi Trust	5,048		—		—		5,048
Derivative financial assets:
Interest rate swaps	—		4,669		—		4,669
Interest rate lock commitments	—		271		—		271
Total Assets	$	5,048	$	692,590	$	—	$	697,638
LIABILITIES
Derivative financial liabilities:
Interest rate swaps	$	—	$	4,765	$	—	$	4,765
Forward sale contracts	—		24		—		24
Total Liabilities	$	—	$	4,789	$	—	$	4,789

⁽¹⁾ASU 2016-01 was adopted January 1, 2018, resulting in separate classification of our marketable equity securities previously included in available-for-sale securities.

	December 31, 2017
(dollars in thousands)	Level 1		Level 2		Level 3		Total
ASSETS
Debt securities available-for-sale:
U.S. Treasury securities	$	—	$	19,789	$	—	$	19,789
Obligations of U.S. government corporations and agencies	—		162,193		—		162,193
Collateralized mortgage obligations of U.S. government corporations and agencies	—		108,688		—		108,688
Residential mortgage-backed securities of U.S. government corporations and agencies	—		32,854		—		32,854
Commercial mortgage-backed securities of U.S. government corporations and agencies	—		242,221		—		242,221
Obligations of states and political subdivisions	—		127,402		—		127,402
Marketable equity securities	—		5,144		—		5,144
Total Debt Securities Available-for-Sale	—		698,291		—		698,291
Total Securities	—		698,291		—		698,291
Trading securities held in a Rabbi Trust	5,080		—		—		5,080
Derivative financial assets:
Interest rate swaps	—		3,074		—		3,074
Interest rate lock commitments	—		226		—		226
Total Assets	$	5,080	$	701,591	$	—	$	706,671
LIABILITIES
Derivative financial liabilities:
Interest rate swaps	$	—	$	3,055	$	—	$	3,055
Forward sale contracts	—		5		—		5
Total Liabilities	$	—	$	3,060	$	—	$	3,060

We classify financial instruments as Level 3 when valuation models are used because significant inputs are not observable in the market.     

We may be required to measure certain assets and liabilities at fair value on a nonrecurring basis. Nonrecurring assets are recorded at the lower of cost or fair value in our financial statements. There were no liabilities measured at fair value on a nonrecurring basis at either March 31, 2018 or December 31, 2017.

The following table presents our assets that are measured at fair value on a nonrecurring basis by the fair value hierarchy level as of the dates presented:

	March 31, 2018								December 31, 2017
(dollars in thousands)	Level 1		Level 2		Level 3		Total		Level 1		Level 2		Level 3		Total
ASSETS(1)
Loans held for sale	$	—	$	—	$	—	$	—	$	—	$	—	$	—	$	—
Impaired loans	—		—		6,551		6,551		—		—		6,759		6,759
Other real estate owned	—		—		2,880		2,880		—		—		444		444
Mortgage servicing rights	—		—		106		106		—		—		178		178
Total Assets	$	—	$	—	$	9,537	$	9,537	$	—	$	—	$	7,381	$	7,381
(1)This table presents only the nonrecurring items that are recorded at fair value in our financial statements.

The carrying values and fair values of our financial instruments at March 31, 2018 and December 31, 2017 are presented in the following tables:

	Carrying Value(1)		Fair Value Measurements at March 31, 2018
(dollars in thousands)			Total		Level 1		Level 2		Level 3
ASSETS
Cash and due from banks, including interest-bearing deposits	$	112,849	$	112,849	$	112,849	$	—	$	—
Securities	687,650		687,650		—		687,650		—
Loans held for sale	3,283		3,377		—		—		3,377
Portfolio loans, net	5,671,567		5,530,443		—		—		5,530,443
Bank owned life insurance	72,629		72,629		—		72,629		—
FHLB and other restricted stock	29,769		29,769		—		—		29,769
Trading securities held in a Rabbi Trust	5,048		5,048		5,048		—		—
Mortgage servicing rights	4,182		5,023		—		—		5,023
Interest rate swaps	4,669		4,669		—		4,669		—
Interest rate lock commitments	271		271		—		271		—
LIABILITIES
Deposits	$	5,387,094	$	5,372,506	$	—	$	—	$	5,372,506
Securities sold under repurchase agreements	44,617		44,617		—		—		44,617
Short-term borrowings	525,000		525,000		—		—		525,000
Long-term borrowings	46,684		46,892		—		—		46,892
Junior subordinated debt securities	45,619		45,619		—		—		45,619
Interest rate swaps	4,765		4,765		—		4,765		—
Interest rate lock commitments	24		24		—		24		—
(1) As reported in the Consolidated Balance Sheets

	Carrying Value(1)		Fair Value Measurements at December 31, 2017
(dollars in thousands)			Total		Level 1		Level 2		Level 3
ASSETS
Cash and due from banks, including interest-bearing deposits	$	117,152	$	117,152	$	117,152	$	—	$	—
Securities	698,291		698,291		—		698,291		—
Loans held for sale	4,485		4,583		—		—		4,583
Portfolio loans, net	5,705,059		5,690,292		—		—		5,690,292
Bank owned life insurance	72,150		72,150		—		72,150		—
FHLB and other restricted stock	29,270		29,270		—		—		29,270
Trading securities held in a Rabbi Trust	5,080		5,080		5,080		—		—
Mortgage servicing rights	4,133		4,571		—		—		4,571
Interest rate swaps	3,074		3,074		—		3,074		—
Interest rate lock commitments	226		226		—		226		—
LIABILITIES
Deposits	$	5,427,891	$	5,426,928	$	—	$	—	$	5,426,928
Securities sold under repurchase agreements	50,161		50,161		—		—		50,161
Short-term borrowings	540,000		540,000		—		—		540,000
Long-term borrowings	47,301		47,618		—		—		47,618
Junior subordinated debt securities	45,619		45,619		—		—		45,619
Interest rate swaps	3,055		3,055		—		3,055		—
Interest rate lock commitments	5		5		—		5		—
(1) As reported in the Consolidated Balance Sheets

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Securities

3 Months Ended

Mar. 31, 2018

Investments, Debt and Equity Securities [Abstract]

SECURITIES

The following table presents the fair values of our securities portfolio at the dates presented:

(dollars in thousands)	March 31, 2018	December 31, 2017
Debt securities available for sale	682,454	693,147
Marketable equity securities	5,196	5,144
Total Securities	687,650	698,291

Debt Securities Available for Sale

The following tables present the amortized cost and fair value of debt securities available for sale as of March 31, 2018 and debt and equity securities available for sale as of December 31, 2017:

	March 31, 2018									December 31, 2017
(dollars in thousands)	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value		Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
U.S. Treasury securities	$	14,951	$	—	$	(290	)	$	14,661	$	19,943	$	—	$	(154	)	$	19,789
Obligations of U.S. government corporations and agencies	161,844		62		(1,317		)	160,589		162,045		341		(193		)	162,193
Collateralized mortgage obligations of U.S. government corporations and agencies	105,063		2		(2,483		)	102,582		109,916		93		(1,321		)	108,688
Residential mortgage-backed securities of U.S. government corporations and agencies	30,700		443		(460		)	30,683		32,388		679		(213		)	32,854
Commercial mortgage-backed securities of U.S. government corporations and agencies (1)	255,043		—		(6,245		)	248,798		244,018		247		(2,044		)	242,221
Obligations of states and political subdivisions	122,650		2,563		(72		)	125,141		123,159		4,285		(42		)	127,402
Total Debt Securities Available-for-Sale	690,251		3,070		(10,867		)	682,454		691,469		5,645		(3,967		)	693,147
Total equity securities (2)	—		—		—			—		3,815		1,330		(1		)	5,144
Total Securities	$	690,251	$	3,070	$	(10,867	)	$	682,454	$	695,284	$	6,975	$	(3,968	)	$	698,291

⁽¹⁾ Includes a $5.9 million security purchase that was pending settlement as of December 31, 2017.

⁽²⁾ ASU 2016-01 was adopted January 1, 2018, resulting in separate classification of our marketable equity securities previously included in available-for-sale securities.

The following tables present the fair value and the age of gross unrealized losses on debt securities available for sale by investment category as of the dates presented:

	March 31, 2018
	Less Than 12 Months						12 Months or More						Total
(dollars in thousands)	Number of Securities	Fair Value		Unrealized Losses			Number of Securities	Fair Value		Unrealized Losses			Number of Securities	Fair Value		Unrealized Losses
U.S. Treasury securities	2	$	14,661	$	(290	)	—	$	—	$	—		2	$	14,661	$	(290	)
Obligations of U.S. government corporations and agencies	16	130,823		(1,274		)	1	10,000		(43		)	17	140,823		(1,317		)
Collateralized mortgage obligations of U.S. government corporations and agencies	8	55,695		(800		)	7	43,184		(1,683		)	15	98,879		(2,483		)
Residential mortgage-backed securities of U.S. government corporations and agencies	3	4,861		(106		)	2	7,976		(354		)	5	12,837		(460		)
Commercial mortgage-backed securities of U.S. government corporations and agencies	22	201,051		(4,170		)	5	47,747		(2,075		)	27	248,798		(6,245		)
Obligations of states and political subdivisions	5	23,700		(72		)	—	—		—			5	23,700		(72		)
Total Temporarily Impaired Debt Securities	56	$	430,791	$	(6,712	)	15	$	108,907	$	(4,155	)	71	$	539,698	$	(10,867	)

	December 31, 2017
	Less Than 12 Months						12 Months or More						Total
(dollars in thousands)	Number of Securities	Fair Value		Unrealized Losses			Number of Securities	Fair Value		Unrealized Losses			Number of Securities	Fair Value		Unrealized Losses
U.S. Treasury securities	3	$	19,789	$	(154	)	—	$	—	$	—		3	$	19,789	$	(154	)
Obligations of U.S. government corporations and agencies	9	63,635		(144		)	1	10,017		(49		)	10	73,652		(193		)
Collateralized mortgage obligations of U.S. government corporations and agencies	7	47,465		(248		)	7	45,809		(1,073		)	14	93,274		(1,321		)
Residential mortgage-backed securities of U.S. government corporations and agencies	1	2,333		(10		)	2	8,638		(203		)	3	10,971		(213		)
Commercial mortgage-backed securities of U.S. government corporations and agencies	14	128,300		(775		)	5	48,746		(1,269		)	19	177,046		(2,044		)
Obligations of states and political subdivisions	2	10,330		(42		)	—	—		—			2	10,330		(42		)
Total Temporarily Impaired Debt Securities	36	$	271,852	$	(1,373	)	15	$	113,210	$	(2,594	)	51	$	385,062	$	(3,967	)

We do not believe any individual unrealized loss as of March 31, 2018 represents an other than temporary impairment, or OTTI. At March 31, 2018 there were 71 debt securities and at December 31, 2017 there were 51 debt securities in an unrealized loss position. The unrealized losses on debt securities were primarily attributable to changes in interest rates and not related to the credit quality of these securities. All debt securities are determined to be investment grade and are paying principal and interest according to the contractual terms of the security. We do not intend to sell and it is more likely than not that we will not be required to sell any of the securities in an unrealized loss position before recovery of their amortized cost.

The following table presents net unrealized gains and losses, net of tax, on debt securities available-for-sale included in accumulated other comprehensive income/(loss), for the periods presented:

	March 31, 2018									December 31, 2017
(dollars in thousands)	Gross Unrealized Gains			Gross Unrealized Losses			Net Unrealized Gains/ (Losses)			Gross Unrealized Gains			Gross Unrealized Losses			Net Unrealized Gains/ (Losses)
Total unrealized gains(losses) on debt securities available-for-sale	$	3,070		$	(10,867	)	$	(7,797	)	$	5,645		$	(3,967	)	$	1,678
Income tax (expense)benefit	(652		)	2,308			1,656			(1,982		)	1,393			(589		)
Net Unrealized Gains/(losses), Net of Tax Included in Accumulated Other Comprehensive Income/(Loss)	$	2,418		$	(8,559	)	$	(6,141	)	$	3,663		$	(2,574	)	$	1,089

The amortized cost and fair value of debt securities available-for-sale at March 31, 2018 by contractual maturity are included in the table below. Actual maturities may differ from contractual maturities because issuers may have the right to call or prepay obligations with or without call or prepayment penalties.

	March 31, 2018
(dollars in thousands)	Amortized Cost		Fair Value
Obligations of the U.S. Treasury, U.S. government corporations and agencies, and obligations of states and political subdivisions
Due in one year or less	$	43,472	$	43,372
Due after one year through five years	148,616		148,787
Due after five years through ten years	78,565		78,767
Due after ten years	28,792		29,465
	299,445		300,391
Collateralized mortgage obligations of U.S. government corporations and agencies	105,063		102,582
Residential mortgage-backed securities of U.S. government corporations and agencies	30,700		30,683
Commercial mortgage-backed securities of U.S. government corporations and agencies	255,043		248,798
Total Debt Securities Available-for-Sale	$	690,251	$	682,454

At March 31, 2018 and December 31, 2017, debt securities with carrying values of $221 million and $249 million were pledged for various regulatory and legal requirements.

Marketable Equity Securities

The following table presents realized and unrealized net gains and losses for our marketable equity securities for the periods presented:

	Three months ended March 31,
(dollars in thousands)	2018		2017
Marketable Equity Securities
Net gains/losses recognized during the period	$	52	$	733
Less: Net gains/losses recognized for equity securities sold during the period	—		370
Unrealized Gains/Losses Recognized on Equity Securities Still Held	$	52	$	363

Prior to January 1, 2018, net unrealized gains and losses, net of tax, on marketable equity securities were included in AOCI for the periods presented. Net unrealized gains and losses, net of tax on marketable equity securities of $0.9 million were reclassified from AOCI to retained earnings at January 1, 2018.

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Loans and Loans Held for Sale

3 Months Ended

Mar. 31, 2018

Receivables [Abstract]

LOANS AND LOANS HELD FOR SALE

Loans are presented net of unearned income of $5.1 million and $5.2 million at March 31, 2018 and December 31, 2017.

The following table indicates the composition of loans as of the dates presented:

(dollars in thousands)	March 31, 2018		December 31, 2017
Commercial
Commercial real estate	$	2,760,891	$	2,685,994
Commercial and industrial	1,406,950		1,433,266
Commercial construction	324,141		384,334
Total Commercial Loans	4,491,982		4,503,594
Consumer
Residential mortgage	692,385		698,774
Home equity	474,850		487,326
Installment and other consumer	66,890		67,204
Consumer construction	4,506		4,551
Total Consumer Loans	1,238,631		1,257,855
Total Portfolio Loans	5,730,613		5,761,449
Loans held for sale	3,283		4,485
Total Loans	$	5,733,896	$	5,765,934

We attempt to limit our exposure to credit risk by diversifying our loan portfolio by segment, geography, collateral and industry and actively managing concentrations.When concentrations exist in certain segments, we mitigate this risk by reviewing the relevant economic indicators and internal risk rating trends and through stress testing of the loans in these segments.Total commercial loans represented 78 percent of total portfolio loans at both March 31, 2018 and December 31, 2017. Within our commercial portfolio, the CRE and Commercial Construction portfolios combined comprised $3.1 billion or 69 percent of total commercial loans and 54 percent of total portfolio loans at March 31, 2018 and comprised of $3.1 billion or 68 percent of total commercial loans and 53 percent of total portfolio loans at December 31, 2017. Further segmentation of the CRE and Commercial Construction portfolios by collateral type reveals no concentration in excess of 13 percent of both total CRE and Commercial Construction loans at March 31, 2018 and 14 percent at December 31, 2017.

Our market area includes Pennsylvania and the contiguous states of Ohio, West Virginia, New York and Maryland. The majority of our commercial and consumer loans are made to businesses and individuals in this market area, resulting in a geographic concentration. We believe our knowledge and familiarity with customers and conditions locally outweighs this geographic concentration risk. The conditions of the local and regional economies are monitored closely through publicly available data and information supplied by our customers. Our CRE and Commercial Construction portfolios have out-of-market exposure of 5.0 percent of their combined portfolios and 2.7 percent of total portfolio loans at March 31, 2018. This compares to 5.2 percent of their combined portfolios and 2.8 percent of total portfolio loans at December 31, 2017.

We individually evaluate all substandard commercial loans that have experienced a forbearance or change in terms agreement, and all substandard consumer and residential mortgage loans that entered into an agreement to modify their existing loan, to determine if they should be designated as troubled debt restructurings, or TDRs.

All TDRs are considered to be impaired loans and will be reported as impaired loans for the remaining life of the loan, unless the restructuring agreement specifies an interest rate equal to or greater than the rate that would be accepted at the time of the restructuring for a new loan with comparable risk and it is fully expected that the remaining principal and interest will be collected according to the restructured agreement. Further, all impaired loans are reported as nonaccrual loans unless the loan is a TDR that has met the requirements to be returned to accruing status. TDRs can be returned to accruing status if the ultimate collectability of all contractual amounts due, according to the restructured agreement, is not in doubt and there is a period of a minimum of six months of satisfactory payment performance by the borrower either immediately before or after the restructuring.

The following table summarizes restructured loans as of the dates presented:

	March 31, 2018						December 31, 2017
(dollars in thousands)	Performing TDRs		Nonperforming TDRs		Total TDRs		Performing TDRs		Nonperforming TDRs		Total TDRs
Commercial real estate	$	2,298	$	944	$	3,242	$	2,579	$	967	$	3,546
Commercial and industrial	9,403		3,036		12,439		3,946		3,197		7,143
Commercial construction	2,400		414		2,814		2,420		2,413		4,833
Residential mortgage	2,178		2,640		4,818		2,039		3,585		5,624
Home equity	3,713		1,520		5,233		3,885		979		4,864
Installment and other consumer	43		6		49		32		9		41
Total	$	20,035	$	8,560	$	28,595	$	14,901	$	11,150	$	26,051

There were no TDRs returned to accruing status during the three months ended March 31, 2018 and March 31, 2017.

The following tables present the restructured loans by loan segment and by type of concession for the three months ended March 31, 2018 and 2017:

	Three Months Ended March 31, 2018								Three Months Ended March 31, 2017
(dollars in thousands)	Number of Loans	Pre-Modification Outstanding Recorded Investment(1)		Post-Modification Outstanding Recorded Investment(1)		Total  Difference in Recorded Investment			Number of Loans	Pre-Modification Outstanding Recorded Investment(1)		Post-Modification Outstanding Recorded Investment(1)		Total  Difference in Recorded Investment
Totals by Loan Segment
Commercial real estate
Commercial and industrial
Maturity date extension	2	$	768	$	708	$	(60	)	—	$	—	$	—	$	—
Principal deferral	6	5,355		5,333		(22		)	—	—		—		—
Total Commercial and Industrial	8	6,123		6,041		(82		)	—	—		—		—
Commercial Construction		.
Chapter 7 bankruptcy(2)	2	158		157		(1		)	—	—		—		—
Total Commercial Construction	2	158		157		(1		)	—	—		—		—
Home equity
Chapter 7 bankruptcy(2)	9	578		555		(23		)	6	269		266		(3		)
Maturity date extension and interest rate reduction	—	—		—		—			1	173		172		(1		)
Total Home Equity	9	578		555		(23		)	7	442		438		(4		)
Installment and other consumer
Chapter 7 bankruptcy(2)	2	17		17		—			—	—		—		—
Total Installment and Other Consumer	2	17		17		—			—	—		—		—
Totals by Concession Type
Chapter 7 bankruptcy(2)	13	$	753	$	729	$	(24	)	6	$	269	$	266	$	(3	)
Maturity date extension	2	768		708		(60		)	—	—		—		—
Maturity date extension and interest rate reduction	—	—		—		—			1	173		172		(1		)
Principal deferral	6	5,355		5,333		(22		)	—	—		—		—
Total	21	$	6,876	$	6,770	$	(106	)	7	$	442	$	438	$	(4	)
(1) Excludes loans that were fully paid off or fully charged-off by period end. The pre-modification balance represents the balance outstanding prior to modification. The post-modification balance represents the outstanding balance at period end. (2) Chapter 7 bankruptcy loans where the debt has been legally discharged through the bankruptcy court and not reaffirmed.

As of March 31, 2018, we had no commitments to lend additional funds on TDRs. Defaulted TDRs are defined as loans having a payment default of 90 days or more after the restructuring takes place. There were no TDRs that defaulted during the three months ended March 31, 2018 and 2017 that were restructured within the last 12 months prior to defaulting.

The following table is a summary of nonperforming assets as of the dates presented:

	Nonperforming Assets
(dollars in thousands)	March 31, 2018		December 31, 2017
Nonperforming Assets
Nonaccrual loans	$	12,775	$	12,788
Nonaccrual TDRs	8,560		11,150
Total Nonaccrual Loans	21,335		23,938
OREO	2,920		469
Total Nonperforming Assets	$	24,255	$	24,407

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Allowance for Loan Losses

3 Months Ended

Mar. 31, 2018

Receivables [Abstract]

ALLOWANCE FOR LOAN LOSSES

ALLOWANCE FOR LOAN LOSSES

We maintain an allowance for loan losses, or ALL, at a level determined to be adequate to absorb estimated probable credit losses inherent within the loan portfolio as of the balance sheet date. We develop and document a systematic ALL methodology based on the following portfolio segments: 1) CRE, 2) C&I, 3) Commercial Construction, 4) Consumer Real Estate and 5) Other Consumer.

The following are key risks within each portfolio segment:

CRE—Loans secured by commercial purpose real estate, including both owner-occupied properties and investment properties for various purposes such as hotels, strip malls and apartments. Operations of the individual projects and global cash flows of the debtors are the primary sources of repayment for these loans. The condition of the local economy is an important indicator of risk, but there are also more specific risks depending on the collateral type and the business prospects of the lessee, if the project is not owner-occupied.

C&I—Loans made to operating companies or manufacturers for the purpose of production, operating capacity, accounts receivable, inventory or equipment financing. Cash flow from the operations of the company is the primary source of repayment for these loans. The condition of the local economy is an important indicator of risk, but there are also more specific risks depending on the industry of the company. Collateral for these types of loans often do not have sufficient value in a distressed or liquidation scenario to satisfy the outstanding debt.

Commercial Construction—Loans made to finance construction of buildings or other structures, as well as to finance the acquisition and development of raw land for various purposes. While the risk of these loans is generally confined to the construction period, if there are problems, the project may not be completed, and as such, may not provide sufficient cash flow on its own to service the debt or have sufficient value in a liquidation to cover the outstanding principal. The condition of the local economy is an important indicator of risk, but there are also more specific risks depending on the type of project and the experience and resources of the developer.

Consumer Real Estate—Loans secured by first and second liens such as home equity loans, home equity lines of credit and 1-4 family residential mortgages, including purchase money mortgages. The primary source of repayment for these loans is the income and assets of the borrower. The condition of the local economy, in particular the unemployment rate, is an important indicator of risk for this segment. The state of the local housing market can also have a significant impact on this segment because low demand and/or declining home values can limit the ability of borrowers to sell a property and satisfy the debt.

Other Consumer—Loans made to individuals that may be secured by assets other than 1-4 family residences, as well as unsecured loans. This segment includes auto loans, unsecured loans and lines and credit cards. The primary source of repayment for these loans is the income and assets of the borrower. The condition of the local economy, in particular the unemployment rate, is an important indicator of risk for this segment. The value of the collateral, if there is any, is less likely to be a source of repayment due to less certain collateral values.

We further assess risk within each portfolio segment by pooling loans with similar risk characteristics. For the commercial loan classes, the most important indicator of risk is the internally assigned risk rating, including pass, special mention and substandard. Consumer loans are pooled by type of collateral, lien position and loan to value, or LTV, for Consumer Real Estate loans. Historical loss rates are applied to these loan pools to determine the reserve for loans collectively evaluated for impairment.

The ALL methodology for groups of loans collectively evaluated for impairment is comprised of both a quantitative and qualitative analysis. A key assumption in the quantitative component of the reserve is the loss emergence period, or LEP. The LEP is an estimate of the average amount of time from the point at which a loss is incurred on a loan to the point at which the loss is confirmed. Another key assumption is the look-back period, or LBP, which represents the historical data period utilized to calculate loss rates.

Management monitors various credit quality indicators for both the commercial and consumer loan portfolios, including delinquency, nonperforming status and changes in risk ratings on a monthly basis.

The following tables present the age analysis of past due loans segregated by class of loans as of the dates presented:

	March 31, 2018
(dollars in thousands)	Current		30-59 Days Past Due		60-89 Days Past Due		Non - performing		Total Past Due Loans		Total Loans
Commercial real estate	$	2,755,336	$	1,162	$	441	$	3,952	$	5,555	$	2,760,891
Commercial and industrial	1,401,154		1,059		120		4,617		5,796		1,406,950
Commercial construction	321,900		368		—		1,873		2,241		324,141
Residential mortgage	682,092		3,125		453		6,715		10,293		692,385
Home equity	468,762		1,603		376		4,109		6,088		474,850
Installment and other consumer	66,551		189		81		69		339		66,890
Consumer construction	4,506		—		—		—		—		4,506
Loans held for sale	3,283		—		—		—		—		3,283
Total	$	5,703,584	$	7,506	$	1,471	$	21,335	$	30,312	$	5,733,896

	December 31, 2017
(dollars in thousands)	Current		30-59 Days Past Due		60-89 Days Past Due		Non - performing		Total Past Due Loans		Total Loans
Commercial real estate	$	2,681,395	$	997	$	134	$	3,468	$	4,599	$	2,685,994
Commercial and industrial	1,426,754		420		446		5,646		6,512		1,433,266
Commercial construction	377,968		2,473		20		3,873		6,366		384,334
Residential mortgage	687,195		2,975		1,439		7,165		11,579		698,774
Home equity	480,956		2,065		590		3,715		6,370		487,326
Installment and other consumer	66,770		193		170		71		434		67,204
Consumer construction	4,551		—		—		—		—		4,551
Loans held for sale	4,485		—		—		—		—		4,485
Total	$	5,730,074	$	9,123	$	2,799	$	23,938	$	35,860	$	5,765,934

We continually monitor the commercial loan portfolio through an internal risk rating system. Loan risk ratings are assigned based upon the creditworthiness of the borrower and are reviewed on an ongoing basis according to our internal policies. Loans within the pass rating generally have a lower risk of loss than loans risk rated as special mention or substandard.

Our risk ratings are consistent with regulatory guidance and are as follows:

Pass—The loan is currently performing and is of high quality.

Special Mention—A special mention loan has potential weaknesses that warrant management’s close attention. If left uncorrected, these potential weaknesses may result in deterioration of the repayment prospects or in the strength of our credit position at some future date. Economic and market conditions, beyond the borrower’s control, may in the future necessitate this classification.

Substandard—A substandard loan is not adequately protected by the net worth and/or paying capacity of the borrower or by the collateral pledged, if any. Substandard loans have a well-defined weakness or weaknesses that jeopardize the liquidation of the debt. These loans are characterized by the distinct possibility that we will sustain some loss if the deficiencies are not corrected.

The following tables present the recorded investment in commercial loan classes by internally assigned risk ratings as of the dates presented:

	March 31, 2018
(dollars in thousands)	Commercial Real Estate		% of Total		Commercial and Industrial		% of Total		Commercial Construction		% of Total		Total		% of Total
Pass	$	2,625,232	95.1	%	$	1,294,478	92.0	%	$	303,985	93.8	%	$	4,223,695	94.0	%
Special mention	68,204		2.5	%	65,557		4.7	%	14,919		4.6	%	148,680		3.3	%
Substandard	67,455		2.4	%	46,915		3.3	%	5,237		1.6	%	119,607		2.7	%
Total	$	2,760,891	100.0	%	$	1,406,950	100.0	%	$	324,141	100.0	%	$	4,491,982	100.0	%
	December 31, 2017
(dollars in thousands)	Commercial Real Estate		% of Total		Commercial and Industrial		% of Total		Commercial Construction		% of Total		Total		% of Total
Pass	$	2,588,847	96.4	%	$	1,345,810	93.9	%	$	368,105	95.8	%	$	4,302,762	95.5	%
Special mention	66,436		2.5	%	54,320		3.8	%	9,345		2.4	%	130,101		2.9	%
Substandard	30,711		1.1	%	33,136		2.3	%	6,884		1.8	%	70,731		1.6	%
Total	$	2,685,994	100.0	%	$	1,433,266	100.0	%	$	384,334	100.0	%	$	4,503,594	100.0	%

We monitor the delinquent status of the consumer portfolio on a monthly basis. Loans are considered nonperforming when interest and principal are 90 days or more past due or management has determined that a material deterioration in the borrower’s financial condition exists. The risk of loss is generally highest for nonperforming loans.

The following tables present the recorded investment in consumer loan classes by performing and nonperforming status as of the dates presented:

	March 31, 2018
(dollars in thousands)	Residential Mortgage		% of Total		Home Equity		% of Total		Installment and other consumer		% of Total		Consumer Construction		% of Total		Total		% of Total
Performing	$	685,670	99.0	%	$	470,741	99.1	%	$	66,821	99.9	%	$	4,506	100.0	%	$	1,227,738	99.1	%
Nonperforming	6,715		1.0	%	4,109		0.9	%	69		0.1	%	—		—	%	10,893		0.9	%
Total	$	692,385	100.0	%	$	474,850	100.0	%	$	66,890	100.0	%	$	4,506	100.0	%	$	1,238,631	100.0	%
	December 31, 2017
(dollars in thousands)	Residential Mortgage		% of Total		Home Equity		% of Total		Installment and other consumer		% of Total		Consumer Construction		% of Total		Total		% of Total
Performing	$	691,609	99.0	%	$	483,611	99.2	%	$	67,133	99.9	%	$	4,551	100.0	%	$	1,246,904	99.1	%
Nonperforming	7,165		1.0	%	3,715		0.8	%	71		0.1	%	—		—	%	10,951		0.9	%
Total	$	698,774	100.0	%	$	487,326	100.0	%	$	67,204	100.0	%	$	4,551	100.0	%	$	1,257,855	100.0	%

We individually evaluate all substandard and nonaccrual commercial loans greater than $0.5 million for impairment. Loans are considered to be impaired when based upon current information and events it is probable that we will be unable to collect all principal and interest payments due according to the original contractual terms of the loan agreement. All TDRs will be reported as an impaired loan for the remaining life of the loan, unless the restructuring agreement specifies an interest rate equal to or greater than the rate that would be accepted at the time of the restructuring for a new loan with comparable risk and it is expected that the remaining principal and interest will be fully collected according to the restructured agreement. For all TDRs, regardless of size, all other impaired loans, we conduct further analysis to determine the probable loss and assign a specific reserve to the loan if deemed appropriate.

The following tables summarize investments in loans considered to be impaired and related information on those impaired loans as of the dates presented:

	March 31, 2018						December 31, 2017
(dollars in thousands)	Recorded Investment		Unpaid Principal Balance		Related Allowance		Recorded Investment		Unpaid Principal Balance		Related Allowance
With a related allowance recorded:
Commercial real estate	$	—	$	—	$	—	$	—	$	—	$	—
Commercial and industrial	656		671		537		1,735		1,787		29
Commercial construction	—		—		—		—		—		—
Consumer real estate	—		—		—		21		21		21
Other consumer	39		39		39		27		27		27
Total with a Related Allowance Recorded	695		710		576		1,783		1,835		77
Without a related allowance recorded:
Commercial real estate	3,774		4,034		—		3,546		3,811		—
Commercial and industrial	11,917		13,972		—		5,549		7,980		—
Commercial construction	3,444		4,954		—		5,464		8,132		—
Consumer real estate	10,052		10,987		—		10,467		11,357		—
Other consumer	10		17		—		14		22		—
Total without a Related Allowance Recorded	29,197		33,964		—		25,040		31,302		—
Total:
Commercial real estate	3,774		4,034		—		3,546		3,811		—
Commercial and industrial	12,573		14,643		537		7,284		9,767		29
Commercial construction	3,444		4,954		—		5,464		8,132		—
Consumer real estate	10,052		10,987		—		10,488		11,378		21
Other consumer	49		56		39		41		49		27
Total	$	29,892	$	34,674	$	576	$	26,823	$	33,137	$	77

The following table summarizes average recorded investment in and interest income recognized on loans considered to be impaired for the periods presented:

	Three Months Ended
	March 31, 2018				March 31, 2017
(dollars in thousands)	Average Recorded Investment		Interest Income Recognized		Average Recorded Investment		Interest Income Recognized
With a related allowance recorded:
Commercial real estate	$	—	$	—	$	—	$	—
Commercial and industrial	586		11		10,008		72
Commercial construction	—		—		—		—
Consumer real estate	—		—		26		—
Other consumer	42		1		1		—
Total with a Related Allowance Recorded	628		12		10,035		72
Without a related allowance recorded:
Commercial real estate	3,817		43		8,581		33
Commercial and industrial	6,688		110		11,410		43
Commercial construction	3,446		36		6,239		37
Consumer real estate	10,816		138		11,692		129
Other consumer	12		—		22		—
Total without a Related Allowance Recorded	24,779		327		37,944		242
Total:
Commercial real estate	3,817		43		8,581		33
Commercial and industrial	7,274		121		21,418		115
Commercial construction	3,446		36		6,239		37
Consumer real estate	10,816		138		11,718		129
Other consumer	54		1		23		—
Total	$	25,407	$	339	$	47,979	$	314

The following tables detail activity in the ALL for the periods presented:

	Three Months Ended March 31, 2018
(dollars in thousands)	Commercial Real Estate			Commercial and Industrial			Commercial Construction			Consumer Real Estate			Other Consumer			Total Loans
Balance at beginning of period	$	27,235		$	8,966		$	13,167		$	5,479		$	1,543		$	56,390
Charge-offs	—			(829		)	—			(161		)	(460		)	(1,450		)
Recoveries	49			117			1,129			238			101			1,634
Net (Charge-offs)/ Recoveries	49			(712		)	1,129			77			(359		)	184
Provision for loan losses	3,679			2,218			(3,575		)	(138		)	288			2,472
Balance at End of Period	$	30,963		$	10,472		$	10,721		$	5,418		$	1,472		$	59,046
	Three Months Ended March 31, 2017
(dollars in thousands)	Commercial Real Estate			Commercial and Industrial			Commercial Construction			Consumer Real Estate			Other Consumer			Total Loans
Balance at beginning of period	$	19,976		$	10,810		$	13,999		$	6,095		$	1,895		$	52,775
Charge-offs	(390		)	(715		)	(644		)	(759		)	(434		)	(2,942		)
Recoveries	78			187			256			103			176			800
Net (Charge-offs)/ Recoveries	(312		)	(528		)	(388		)	(656		)	(258		)	(2,142		)
Provision for loan losses	906			2,962			491			517			307			5,183
Balance at End of Period	$	20,570		$	13,244		$	14,102		$	5,956		$	1,944		$	55,816

The following tables present the ALL and recorded investments in loans by category as of the periods presented:

	March 31, 2018
	Allowance for Loan Losses						Portfolio Loans
(dollars in thousands)	Individually Evaluated for Impairment		Collectively Evaluated for Impairment		Total		Individually Evaluated for Impairment		Collectively Evaluated for Impairment		Total
Commercial real estate	$	—	$	30,963	$	30,963	$	3,774	$	2,757,117	$	2,760,891
Commercial and industrial	537		9,935		10,472		12,573		1,394,377		1,406,950
Commercial construction	—		10,721		10,721		3,444		320,697		324,141
Consumer real estate	—		5,418		5,418		10,052		1,161,689		1,171,741
Other consumer	39		1,433		1,472		49		66,841		66,890
Total	$	576	$	58,470	$	59,046	$	29,892	$	5,700,721	$	5,730,613
	December 31, 2017
	Allowance for Loan Losses						Portfolio Loans
(dollars in thousands)	Individually Evaluated for Impairment		Collectively Evaluated for Impairment		Total		Individually Evaluated for Impairment		Collectively Evaluated for Impairment		Total
Commercial real estate	$	—	$	27,235	$	27,235	$	3,546	$	2,682,448	$	2,685,994
Commercial and industrial	29		8,937		8,966		7,284		1,425,982		1,433,266
Commercial construction	—		13,167		13,167		5,464		378,870		384,334
Consumer real estate	21		5,458		5,479		10,488		1,180,163		1,190,651
Other consumer	27		1,516		1,543		41		67,163		67,204
Total	$	77	$	56,313	$	56,390	$	26,823	$	5,734,626	$	5,761,449

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Derivative Instruments and Hedging Activities

3 Months Ended

Mar. 31, 2018

Derivative Instruments and Hedging Activities Disclosure [Abstract]

DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES

Interest Rate Swaps

In accordance with applicable accounting guidance for derivatives and hedging, all derivatives are recognized as either assets or liabilities on the balance sheet at fair value. Interest rate swaps are contracts in which a series of interest rate flows (fixed and variable) are exchanged over a prescribed period. The notional amounts on which the interest payments are based are not exchanged. These derivative positions relate to transactions in which we enter into an interest rate swap with a commercial customer while at the same time entering into an offsetting interest rate swap with another financial institution. In connection with each transaction, we agree to pay interest to the customer on a notional amount at a variable interest rate and receive interest from the customer on the same notional amount at a fixed rate. At the same time, we agree to pay another financial institution the same fixed interest rate on the same notional amount and receive the same variable interest rate on the same notional amount. The transaction allows our customer to effectively convert a variable rate loan to a fixed rate loan with us receiving a variable rate. These agreements could have floors or caps on the contracted interest rates.

Pursuant to our agreements with various financial institutions, we may receive collateral or may be required to post collateral based upon mark-to-market positions. Beyond unsecured threshold levels, collateral in the form of cash or securities may be made available to counterparties of interest rate swap transactions. Based upon our current positions and related future collateral requirements relating to them, we believe any effect on our cash flow or liquidity position to be immaterial.

Derivatives contain an element of credit risk, the possibility that we will incur a loss because a counterparty, which may be a financial institution or a customer, fails to meet its contractual obligations. All derivative contracts with financial institutions may be executed only with counterparties approved by our Asset and Liability Committee, or ALCO, and derivatives with customers may only be executed with customers within credit exposure limits approved by our Senior Loan Committee. Interest rate swaps are considered derivatives, but are not accounted for using hedge accounting. As such, changes in the estimated fair value of the derivatives are recorded in current earnings and included in other noninterest income in the Consolidated Statements of Comprehensive Income.

Interest Rate Lock Commitments and Forward Sale Contracts

In the normal course of business, we sell originated mortgage loans into the secondary mortgage loan market. We also offer interest rate lock commitments to potential borrowers. The commitments are generally for a period of 60 days and guarantee a specified interest rate for a loan if underwriting standards are met, but the commitment does not obligate the potential borrower to close on the loan. Accordingly, some commitments expire prior to becoming loans. We may encounter pricing risks if interest rates increase significantly before the loan can be closed and sold. We may utilize forward sale contracts in order to mitigate this pricing risk. Whenever a customer desires these products, a mortgage originator quotes a secondary market rate guaranteed for that day by the investor. The rate lock is executed between the mortgagee and us and in turn a forward sale contract may be executed between us and the investor. Both the rate lock commitment and the corresponding forward sale contract for each customer are considered derivatives, but are not accounted for using hedge accounting. As such, changes in the estimated fair value of the derivatives during the commitment period are recorded in current earnings and included in mortgage banking in the Consolidated Statements of Comprehensive Income.

The following tables indicate the amounts representing the value of derivative assets and derivative liabilities as of the dates presented:

	Derivatives (included in Other Assets)				Derivatives (included in Other Liabilities)
(dollars in thousands)	March 31, 2018		December 31, 2017		March 31, 2018		December 31, 2017
Derivatives not Designated as Hedging Instruments:
Interest Rate Swap Contracts- Commercial Loans
Fair value	$	4,669	$	3,074	$	4,765	$	3,055
Notional amount	253,580		263,841		253,580		263,841
Net collateral received/posted	2,011		—		—		1,448
Interest Rate Lock Commitments- Mortgage Loans
Fair value	271		226		—		—
Notional amount	9,710		6,860		—		—
Forward Sale Contracts- Mortgage Loans
Fair value	—		—		24		5
Notional amount	$	—	$	—	$	9,165	$	6,580

Presenting offsetting derivatives that are subject to legally enforceable netting arrangements with the same party is permitted. For example, we may have a derivative asset and a derivative liability with the same counterparty to a swap transaction and are permitted to offset the asset position and the liability position resulting in a net presentation.

The following tables indicate the gross amounts of commercial loan swap derivative assets and derivative liabilities, the amounts offset and the carrying values in the Consolidated Balance Sheets as of the dates presented:

	Derivatives (included in Other Assets)						Derivatives (included in Other Liabilities)
(dollars in thousands)	March 31, 2018			December 31, 2017			March 31, 2018			December 31, 2017
Derivatives not Designated as Hedging Instruments:
Gross amounts recognized	$	5,818		$	4,974		$	5,914		$	4,955
Gross amounts offset	(1,149		)	(1,900		)	(1,149		)	(1,900		)
Net Amounts Presented in the Consolidated Balance Sheets	4,669			3,074			4,765			3,055
Gross amounts not offset(1)	(2,011		)	—			—			(1,448		)
Net Amount	$	2,658		$	3,074		$	4,765		$	1,607

⁽¹⁾ Amounts represent received/posted collateral.

The following tables indicate the gain or loss recognized in income on derivatives for the periods presented:

	Three Months Ended March 31,
(dollars in thousands)	2018			2017
Derivatives not Designated as Hedging Instruments
Interest rate swap contracts—commercial loans	$	115		$	24
Interest rate lock commitments—mortgage loans	45			233
Forward sale contracts—mortgage loans	(19		)	(36		)
Total Derivatives (Loss)/Gain	$	141		$	221

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Borrowings

3 Months Ended

Mar. 31, 2018

Debt Disclosure [Abstract]

BORROWINGS

BORROWINGS

Short-term borrowings are for terms under or equal to one year and are comprised of securities sold under repurchase agreements, or REPOs, and Federal Home Loan Bank, or FHLB, advances. All REPOs are overnight short-term investments and are not insured by the Federal Deposit Insurance Corporation. Securities pledged as collateral under these REPO financing arrangements cannot be sold or repledged by the secured party and therefore, the REPOs are accounted for as a secured borrowing. Mortgage-backed securities with a total carrying value of $49.2 million at March 31, 2018 and $56.8 million at December 31, 2017 were pledged as collateral for these secured transactions. The pledged securities are held in safekeeping at the Federal Reserve. Due to the overnight short-term nature of REPOs, potential risk due to a decline in the value of the pledged collateral is low. Collateral pledging requirements with REPOs are monitored daily. FHLB advances are for various terms and are secured by a blanket lien on residential mortgages and other real estate secured loans.

Long-term borrowings are for original terms greater than one year and are comprised of FHLB advances, a capital lease and junior subordinated debt securities. Long-term FHLB advances are secured by the same loans as short-term FHLB advances. We had total long-term borrowings outstanding of $8.5 million at a fixed rate and $38.1 million at a variable rate at March 31, 2018, excluding our capital lease.

Information pertaining to borrowings is summarized in the table below as of the dates presented:

	March 31, 2018				December 31, 2017
(dollars in thousands)	Balance		Weighted Average Rate		Balance		Weighted Average Rate
Short-term Borrowings
Securities sold under repurchase agreements	$	44,617	0.42	%	$	50,161	0.39	%
Short-term borrowings	525,000		1.86	%	540,000		1.47	%
Total Short-term Borrowings	569,617		1.75	%	590,161		1.38	%
Long-term Borrowings
Long-term borrowings	46,684		2.09	%	47,301		1.88	%
Junior subordinated debt securities	45,619		4.58	%	45,619		3.78	%
Total Long-term Borrowings	92,303		3.32	%	92,920		2.81	%
Total Borrowings	$	661,920	1.97	%	$	683,081	1.57	%

We had total borrowings at March 31, 2018 and December 31, 2017 at the FHLB of Pittsburgh of $572 million and $587 million. The $572 million at March 31, 2018 consisted of $525 million in short-term borrowings and $46.7 million in long-term borrowings. Our maximum borrowing capacity with the FHLB of Pittsburgh was $2.5 billion at March 31, 2018. We utilized $709 million of our borrowing capacity at March 31, 2018 consisting of $572 million for borrowings and $137 million for letters of credit to collateralize public funds. Our remaining borrowing availability at March 31, 2018 is $1.8 billion.

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Commitments and Contingencies

3 Months Ended

Mar. 31, 2018

Commitments and Contingencies Disclosure [Abstract]

COMMITMENTS AND CONTINGENCIES

Commitments

In the normal course of business, we offer off-balance sheet credit arrangements to enable our customers to meet their financing objectives. These instruments involve, to varying degrees, elements of credit and interest rate risk in excess of the amount recognized in the financial statements. Our exposure to credit loss, in the event the customer does not satisfy the terms of the agreement, equals the contractual amount of the obligation less the value of any collateral. We apply the same credit policies in making commitments and standby letters of credit that are used for the underwriting of loans to customers. Commitments generally have fixed expiration dates, annual renewals or other termination clauses and may require payment of a fee. Because many of the commitments are expected to expire without being drawn upon, the total commitment amounts do not necessarily represent future cash requirements. Our allowance for unfunded commitments totaled $2.1 million at March 31, 2018 and $2.2 million at December 31, 2017. The allowance for unfunded commitments is included in other liabilities in the Consolidated Balance Sheets. The allowance for unfunded commitments is determined using a similar methodology as our ALL methodology. The reserve is calculated by applying historical loss rates and qualitative adjustments to our unfunded commitments.

Estimates of the fair value of these off-balance sheet items were not made because of the short-term nature of these arrangements and the credit standing of the counterparties.

The following table sets forth our commitments and letters of credit as of the dates presented:

(dollars in thousands)	March 31, 2018		December 31, 2017
Commitments to extend credit	$	1,454,312	$	1,420,428
Standby letters of credit	78,985		80,918
Total	$	1,533,297	$	1,501,346

Litigation

In the normal course of business, we are subject to various legal and administrative proceedings and claims. While any type of litigation contains a level of uncertainty, we believe that the outcome of such proceedings or claims pending will not have a material adverse effect on our consolidated financial position or results of operations.

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Other Comprehensive Income

3 Months Ended

Mar. 31, 2018

Equity [Abstract]

OTHER COMPREHENSIVE INCOME

OTHER COMPREHENSIVE INCOME

The following tables present the change in components of other comprehensive income (loss) for the periods presented, net of tax effects.

	Three Months Ended March 31, 2018									Three months ended March 31, 2017
(dollars in thousands)	Pre-Tax Amount			Tax (Expense) Benefit			Net of Tax Amount			Pre-Tax Amount			Tax (Expense) Benefit			Net of Tax Amount
Change in net unrealized gains/(losses) on debt securities available-for-sale (2)	$	(9,474	)	$	2,012		$	(7,462	)	$	1,662		$	(584	)	$	1,078
Reclassification adjustment for net (gains)/losses on debt securities available-for-sale included in net income (1)	—			—			—			(370		)	130			(240		)
Adjustment to funded status of employee benefit plans	621			(132		)	489			539			(189		)	350
Other Comprehensive Income/(Loss)	$	(8,853	)	$	1,880		$	(6,973	)	$	1,831		$	(643	)	$	1,188
(1) Reclassification adjustments are comprised of realized security gains or losses. The realized gains or losses have been reclassified out of accumulated other comprehensive income/(loss) and have affected certain lines in the Consolidated Statements of Comprehensive Income as follows; the pre-tax amount is included in securities gains/losses-net, the tax expense amount is included in the provision for income taxes and the net of tax amount is included in net income.
(2) Due to the adoption of ASU 2016-01, net unrealized gains on marketable equity securities were reclassified from Accumulated Other Comprehensive Income to Retained Earnings during the three months ended March 31, 2018. The prior period data was not restated; as such, the change in unrealized gains on marketable securities is combined with the change in net unrealized gains on debit securities for the period ended March 31, 2017.

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Employee Benefits

3 Months Ended

Mar. 31, 2018

Retirement Benefits [Abstract]

EMPLOYEE BENEFITS

Our qualified and nonqualified defined benefit plans were amended to freeze benefit accruals for all persons entitled to benefits under the plan in 2016. We will continue recording pension expense related to these plans, primarily representing interest costs on the accumulated benefit obligation and amortization of actuarial losses accumulated in the plan, as well as income from expected investment returns on pension assets. The expected long-term rate of return on plan assets is 7.50 percent.

The following table summarizes the components of net periodic pension cost for the periods presented:

	Three Months Ended March 31,
(dollars in thousands)	2018			2017
Components of Net Periodic Pension Cost
Service cost—benefits earned during the period	$	—		$	—
Interest cost on projected benefit obligation	967			1,025
Expected return on plan assets	(1,567		)	(1,582		)
Amortization of prior service credit	544			474
Recognized net actuarial loss	—			—
Net Periodic Pension Expense	$	(56	)	$	(83	)

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Qualified Affordable Housing Projects

3 Months Ended

Mar. 31, 2018

Investments in Affordable Housing Projects [Abstract]

QUALIFIED AFFORDABLE HOUSING PROJECTS

QUALIFIED AFFORDABLE HOUSING PROJECTS

We invest in affordable housing projects primarily to satisfy our Community Reinvestment Act requirements. As a limited partner in these operating partnerships, we receive tax credits and tax deductions for losses incurred by the underlying properties. We use the cost method to account for these partnerships. Our total investment in qualified affordable housing projects was $8.0 million at March 31, 2018 and $8.7 million at December 31, 2017. Amortization expense, included in other noninterest expense in the Consolidated Statements of Comprehensive Income, was $0.7 million for the three months ended March 31, 2018 and $0.8 million for the three months ended March 31, 2017. The amortization expense was offset by tax credits of $0.8 million for the three months ended March 31, 2018 and $0.9 million for the three months ended March 31, 2017, a reduction to our federal tax provision.

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Sale of a Majority Interest of Insurance Business

3 Months Ended

Mar. 31, 2018

Disposal Group, Not Discontinued Operation, Disposal Disclosures [Abstract]

SALE OF A MAJORITY INTEREST OF INSURANCE BUSINESS

SALE OF A MAJORITY INTEREST OF INSURANCE BUSINESS

On November 9, 2017, we entered into an asset purchase agreement to sell a 70 percent ownership interest in the assets of our subsidiary, S&T Evergreen Insurance, LLC. The partial sale was accounted for as the sale of a business. At the date of the sale, January 1, 2018, we ceased to have a controlling financial interest, deconsolidated the subsidiary and recognized a gain of $1.9 million. We transferred our 30 percent share of net assets from S&T Evergreen Insurance, LLC to the new entity for a 30 percent partnership interest in a new insurance entity. We will use the equity-method of accounting to recognize changes in the value of our investment in the new insurance entity for our proportional share of income and losses of the new insurance entity.

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Share Repurchase Plan

3 Months Ended

Mar. 31, 2018

Equity [Abstract]

SHARE REPURCHASE PLAN

SHARE REPURCHASE PLAN

On March 19, 2018, our Board of Directors authorized a $50 million share repurchase plan. This repurchase authorization, which is effective through August 31, 2019, permits us to repurchase from time to time up to $50 million in aggregate value of shares of our common stock through a combination of open market and privately negotiated repurchases. The specific timing, price and quantity of repurchases will be at our discretion and will depend on a variety of factors, including general market conditions, the trading price of the common stock, legal and contractual requirements and our financial performance. The repurchase plan does not obligate us to repurchase any particular number of shares. We expect to fund any repurchases from cash on hand and internally generated funds.

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Basis of Presentation (Policies)

3 Months Ended

Mar. 31, 2018

Accounting Policies [Abstract]

Principles of Consolidation

Principles of Consolidation

The interim Consolidated Financial Statements include the accounts of S&T Bancorp, Inc., or S&T, and its wholly owned subsidiaries. All significant intercompany transactions have been eliminated in consolidation. Investments of 20 percent to 50 percent of the outstanding common stock of investees are accounted for using the equity method of accounting.

Basis of Presentation

Basis of Presentation

The accompanying unaudited interim Consolidated Financial Statements of S&T have been prepared in accordance with generally accepted accounting principles, or GAAP, in the United States for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by GAAP for complete financial statements and should be read in conjunction with the audited consolidated financial statements included in our annual report on Form 10-K for the year ended December 31, 2017, filed with the Securities and Exchange Commission, or SEC, on March 1, 2018. In the opinion of management, the accompanying interim financial information reflects all adjustments, consisting of normal recurring adjustments, necessary to present fairly our financial position and the results of operations for each of the interim periods presented. Results of operations for interim periods are not necessarily indicative of the results of operations that may be expected for a full year or any future period.

Reclassification

Reclassification

Amounts in prior period financial statements and footnotes are reclassified whenever necessary to conform to the current period presentation. Reclassifications had no effect on our results of operations or financial condition.

Use of Estimates

Use of Estimates

The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosures of contingent assets and liabilities at the date of the financial statements. Actual results could differ from those estimates.

Recently Adopted Accounting Standards Updates, or ASU or Update

Recently Adopted Accounting Standards Updates, or ASU or Update

Income Taxes - Amendments to SEC Paragraphs Pursuant to SEC Staff Accounting Bulletin No. 118

In March 2018, the FASB issued ASU No. 2018-05 Income Taxes - Amendments to SEC Paragraphs Pursuant to SEC Staff Accounting Bulletin No. 118. The amendments in this ASU add various SEC paragraphs pursuant to the issuance of the SEC Staff Accounting Bulletin to the Accounting Standards Codification Subtopic 740-10. We adopted the amendments in this ASU in conjunction with ASU 2018-02 Reclassification of Certain Tax Effects from AOCI. This ASU had no impact to our Balance Sheets or Statements of Comprehensive Income.

Investments - Debt Securities and Regulated Operations - Amendments to SEC Paragraphs Pursuant to SEC Staff Accounting Bulletin No. 117 and SEC Release No. 33-9273

In March 2018, the FASB issued ASU No. 2018-04 Investments - Debt Securities and Regulated Operations - Amendments to SEC Paragraphs Pursuant to SEC Staff Accounting Bulletin No. 117 and SEC Release No. 33-9273. The amendments in this ASU add various SEC paragraphs pursuant to the issuance of the SEC Staff Accounting Bulletin to the Accounting Standards Codification Subtopics 320 and 980. We adopted the amendments in this ASU in conjunction with ASU 2016-01 as it relates to equity securities.

Income Statement -- Reporting Comprehensive Income - Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income

In February 2018, the FASB issued ASU No. 2018-02, Income Statement - Reporting Comprehensive Income (Topic 220), Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income. The amendments in this Update allow a reclassification from accumulated other comprehensive income to retained earnings for stranded tax effects resulting from the Tax Cuts and Jobs Act, or Tax Act. The amendments eliminate the stranded tax effects resulting from the Tax Act and will improve the usefulness of information reported to financial statement users and will require certain disclosures about the stranded tax effects. This Update is effective for all entities for fiscal years beginning after December 15, 2018 and interim periods within those fiscal years. Early adoption is permitted, including adoption in any interim period, for public business entities for reporting periods for which financial statements have not been issued or made available for issuance. We have elected to reclassify all tax effects related to the Tax Act from accumulated other comprehensive income, or AOCI, to retained earnings as of January 1, 2018. As such, we have early adopted this Update and reclassified $3.7 million for the release of stranded income tax effects relating to unrealized gains and losses on our securities portfolio and our pension plan from AOCI, to retained earnings as of March 31, 2018. The adoption of this ASU had no impact on our Statements of Comprehensive Income. Our policy for releasing income tax effects from AOCI is to release them as investments are sold or mature and liabilities are extinguished.

Compensation - Retirement Benefits - Improving the Presentation of Net Periodic Pension Costs and Net Periodic Post Retirement Benefit Costs

In March 2017, the FASB issued ASU No. 2017-07, Compensation Retirement Benefits - Improving the Presentation of Net Periodic Pension Costs and Net Periodic Post Retirement Benefit Costs (Topic 715). The main objective of this ASU is to provide financial statement users with clearer and disaggregated information related to the components of net periodic benefit cost and improve transparency of the presentation of net periodic benefit cost in the financial statements. This Update is effective for interim and annual reporting periods in fiscal years beginning after December 15, 2017. Early adoption is permitted as of the beginning of an annual period for which financial statements have not been issued or made available for issuance. Effective March 31, 2016, our qualified and nonqualified defined benefit plans were amended to freeze benefit accruals for all persons entitled to benefits under the plan; as such, the adoption of this ASU had no impact on our Consolidated Balance Sheets or Consolidated Statements of Comprehensive Income.

Other Income - Gains and Losses from the Derecognition of Nonfinancial Assets - Clarifying the Scope of Assets Derecognition Guidance and Accounting for Partial Sales of Nonfinancial Assets

In February 2017, the FASB issued ASU No. 2017-05, Other Income - Gains and Losses from the Derecognition of Nonfinancial Assets (Subtopic 610-20). The main objective of this ASU is intended to provide greater detail on what types of transactions should be accounted for as partial sales of nonfinancial assets. The scope of this ASU, as originally issued in ASU No. 2014-09, is intended to reduce the complexity of current GAAP requirements by clarifying which accounting guidance applies to various types of contracts that transfer assets or ownership interest to another entity. This Update was effective for interim and annual reporting periods in fiscal years beginning after December 15, 2017 and at the same time that ASU No. 2014-09 was effective. Early adoption was permitted, but only as of annual reporting periods beginning after December 15, 2016, including interim reporting periods within that reporting period. The adoption of this ASU was applied to the partial sale of our insurance subsidiary. As such, the subsidiary is no longer included in our consolidated financial statements and we recognized a $1.9 million gain on the transaction.

Business Combinations - Clarifying the Definition of a Business

In January 2017, the FASB issued ASU No. 2017-01, Business Combinations - Clarifying the Definition of a Business (Topic 805). The main objective of this ASU is to help financial statement preparers evaluate whether a set of transferred assets and activities (either acquired or disposed of) is a business under Topic 805, Business Combinations by changing the definition of a business. The revised definition will result in fewer acquisitions being accounted for as business combinations than under existing guidance. The definition of a business is significant because it affects the accounting for acquisitions, the identification of reporting units, consolidation evaluations and the accounting for dispositions. This Update was effective for interim and annual reporting periods in fiscal years beginning after December 15, 2017. Early adoption was permitted for transactions not yet reflected in financial statements that have been issued or made available for issuance. The adoption of this ASU had no impact on our Balance Sheets or Statements of Comprehensive Income.

Income Taxes - Intra-Entity Transfers of Assets Other Than Inventory

In October 2016, the FASB issued ASU No. 2016-16, Intra-Entity Transfers of Assets Other Than Inventory. The main objective of this ASU is to require companies to recognize the income tax effects of intercompany sales and transfers of assets other than inventory in the period in which the transfer occurs. This represents a change from existing guidance, which requires companies to defer the income tax effects of intercompany transfers of assets until the asset has been sold to an outside party or otherwise recognized. The new guidance will require companies to defer the income tax effects only of intercompany transfers of inventory. This Update is effective for annual periods beginning after December 15, 2017. Early adoption is permitted as of the beginning of an annual period. If an entity chooses to early adopt the amendments in the ASU, it must do so in the first interim period of its annual financial statements. That is, an entity cannot adopt the amendments in the ASU in a later interim period and apply them as if they were in effect as of the beginning of the year. The adoption of this ASU had no impact on our Balance Sheets or Statements of Comprehensive Income.

Statement of Cash Flows - Classification of Certain Cash Receipts and Cash Payments

In August 2016, the FASB issued ASU No. 2016-15, Classification of Certain Cash Receipts and Cash Payments. The main objective of this ASU is to reduce diversity in practice in how certain transactions are classified in the statement of cash flows. The amendments in this Update provide guidance on the following eight specific cash flow issues: debt prepayment or debt extinguishment costs, settlement of zero-coupon debt instruments, contingent consideration payments made after a business combination, proceeds from the settlement of insurance claims, proceeds from the settlement of bank-owned life insurance (BOLI) policies, distributions received from equity method investments, beneficial interests in securitization transactions, and separately identifiable cash flows and application of the predominance principle. This Update was effective for interim and annual reporting periods in fiscal years beginning after December 15, 2017. Early adoption was permitted, provided that all of the amendments are adopted in the same period. The adoption of this ASU had no material impact to the presentation of activities in our Statements of Cash Flows.

Revenue from Contracts with Customers

In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers (Topic 606). The new revenue pronouncement creates a single source of revenue guidance for all companies in all industries and is more principles-based than current revenue guidance. The pronouncement provides a five-step model for a company to recognize revenue when it transfers control of goods or services to customers at an amount that reflects the consideration to which it expects to be entitled in exchange for those goods or services. The five steps are: 1. identify the contract with the customer; 2. identify the separate performance obligations in the contract; 3. determine the transaction price; 4. allocate the transaction price to the separate performance obligations; and 5. recognize revenue when each performance obligation is satisfied. In August 2015, the FASB issued ASU No. 2015-14, Revenue from Contracts with Customers (Topic 606): Deferral of the Effective Date. This ASU defers the effective date of ASU No. 2014-09 for all entities by one year.

In March 2016, the FASB issued ASU No. 2016-08, Principal versus Agent Considerations (Reporting Revenue Gross versus Net), as an amendment to ASU No. 2014-09 to improve Topic 606, Revenue from Contracts with Customers, by reducing: 1. the potential for diversity in practice arising from inconsistent application of the principal versus agent guidance, and; 2. the cost and complexity of applying Topic 606 both at transition and on an ongoing basis.

In April 2016, the FASB issued ASU No. 2016-10, Identifying Performance Obligations and Licensing, as an amendment to ASU No. 2014-09 to improve Topic 606, Revenue from Contracts with Customers, by reducing: 1. the potential for diversity in practice at initial application and; 2. the cost and complexity of applying Topic 606 both at transition and on an ongoing basis.

In May 2016, the FASB issued ASU No. 2016-12, Narrow-scope Improvements and Practical Expedients. The amendments in this ASU do not change the core principles of Topic 606, Revenue from Contracts with Customers. These amendments affect only the narrow aspects of Topic 606: 1. Collectibility Criterion; 2. Presentation of Sales Taxes and Other Similar Taxes Collected from Customers; 3. Noncash Consideration; 4. Contract Modifications at Transition and; 5. Completed Contracts at Transition.

ASU 2014-09, including transition requirements for all amendments, was effective for interim and annual reporting periods in fiscal years beginning after December 15, 2017. Early adoption was permitted as of the original effective date for interim and annual reporting periods in fiscal years beginning after December 15, 2016. As of January 1, 2018, we adopted ASU 2014-09 Revenue from Contracts with Customers — Topic 606 and all subsequent ASUs that modified Topic 606. The ASU requires that we identify the contract with a customer, identity the performance obligations in the contract, determine the transaction price, allocate the transaction price to the performance obligations in the contract and recognize revenue when we satisfy a performance obligation. We generally satisfy our performance obligations on our contracts with customers as services are rendered and the transaction prices are typically fixed; charged whether on a periodic basis or based on activity. Because performance obligations are satisfied as services are rendered and the transaction prices are fixed, there is little judgment involved in applying Topic 606 that significantly affects the determination of the amount and timing of revenue from contracts with customers.

Significant revenue has not been recognized in the current reporting period that results from performance obligations satisfied in previous periods. The implementation guidance had no material impact on the measurement or timing of revenue recognition.

Our primary sources of revenue are derived from interest and dividends earned on loans, investment securities and other financial instruments that are not within the scope of Topic 606. We have evaluated the nature of our contracts with customers and related revenue streams, including services charges on deposit accounts, debit and credit cards and wealth management and determined that further disaggregation of revenue from contracts with customers into more granular categories beyond what is presented in the Consolidated Statements of Comprehensive Income was not necessary. We have also completed our evaluation of certain costs related to these revenue streams to determine whether such costs should be presented as expenses or contra-revenue. The adoption of this ASU had no material impact on our Balance Sheets or Statements of Comprehensive Income.

Accounting for Financial Instruments - Overall: Classification and Measurement

In January 2016, the FASB issued ASU No. 2016-01, Accounting for Financial Instruments - Overall: Classification and Measurement (Subtopic 825-10). The amendments in this ASU address the following: 1. require equity investments to be measured at fair value with changes in fair value recognized in net income; 2. simplify the impairment assessment of equity investments without readily-determinable fair values by requiring a qualitative assessment to identify impairment; 3. eliminate the requirement to disclose the method(s) and significant assumptions used to estimate the fair value that is required to be disclosed for financial instruments measured at amortized cost on the balance sheet; 4. require entities to use the exit price notion when measuring the fair value of financial instruments for disclosure purposes; 5. require separate presentation in other comprehensive income for the portion of the total change in the fair value of a liability resulting from a change in the instrument-specific credit risk when the entity has elected to measure the liability at fair value in accordance with the fair value option for financial instruments; 6. require separate presentation of financial assets and financial liabilities by measurement category and form of financial asset (that is, securities or loans and receivables) on the balance sheet or in the accompanying notes to the financial statements; and 7. clarify that an entity should evaluate the need for a valuation allowance on a deferred tax asset related to available-for-sale securities in combination with the entity's other deferred tax assets. This ASU was effective for annual and interim periods in fiscal years beginning after December 15, 2017. We adopted ASU No. 2016-01 January 1, 2018 and have concluded that the provisions of this ASU did not materially impact our Balance Sheets or Statements of Comprehensive Income. The new guidance resulted in a change in the fair value measurement of our loan portfolio as of March 31, 2018 using an exit price notion (see Note 3: Fair Value Measurements). The new guidance also resulted in a cumulative-effect adjustment of $0.9 million from AOCI, to retained earnings at January 1, 2018 for net unrealized gains on our marketable equities portfolio. As a result of the new guidance we recognized $0.1 million of net unrealized gains in our Statements of Comprehensive Income during the three months ended March 31, 2018 on our marketable equity securities portfolio.

Recently Issued Accounting Standards

Leases - Land Easement Practical Expedient for Transition to Topic 842

In January 2018, the FASB issued ASU No. 2018-01 Leases - Land Easement Practical Expedient for Transition to Topic 842. The amendments in this ASU permit an entity to elect an optional transition practical expedient to not evaluate under Topic 842 land easements, that exist or expired before the entity's adoption of Topic 842 and that were not previously accounted for as leases under Topic 840. We are evaluating the amendments in this ASU; however, we do not anticipate that these amendments will materially impact to our Balance Sheets or Statements of Comprehensive Income.

Intangibles - Goodwill and Other - Simplifying the Test for Goodwill Impairment

In January 2017, the FASB issued ASU No. 2017-04, Intangibles - Goodwill and Other - Simplifying the Test for Goodwill Impairment (Topic 350). The main objective in this ASU is intended to simplify the current requirements for testing goodwill for impairment by eliminating step two from the goodwill impairment test. The amendments are expected to reduce the complexity and costs associated with performing the goodwill impairment test, which could result in recording impairment charges sooner than under the current guidance. This Update is effective for any interim and annual impairment tests in reporting periods in fiscal years beginning after December 15, 2019. Early adoption is permitted for interim or annual goodwill impairment tests performed on testing dates after January 1, 2017. We are evaluating the provisions of this ASU; however, we do not anticipate that this ASU will materially impact our Balance Sheets or Statements of Comprehensive Income.

Financial Instruments - Credit Losses

In June 2016, the FASB issued ASU No. 2016-13, Measurement of Credit Losses on Financial Instruments. The main objective of this ASU is to provide financial statement users with more decision-useful information about the expected credit losses on financial instruments and other commitments to extend credit held by a reporting entity at each reporting date. The amendments of this Update replace the incurred loss impairment methodology in current GAAP with a methodology that reflects expected credit losses and requires consideration of a broader range of reasonable and supportable information to inform credit loss estimates. The collective changes to the recognition and measurement accounting standards for financial instruments and their anticipated impact on the allowance for credit losses modeling have been universally referred to as the CECL, or current expected credit loss, model. This Update is effective for interim and annual reporting periods in fiscal years beginning after December 15, 2019. Early adoption is permitted as of fiscal years beginning after December 15, 2018, including interim periods within those fiscal years. We have created a CECL Committee to govern the implementation of these amendments consisting of key stakeholders from Credit Administration, Finance, Risk Management and Audit. We have engaged a third-party to assist us in developing our CECL methodology. We continue to evaluate the provisions of this ASU to determine the potential impact on our Balance Sheets and Statements of Comprehensive Income.

Leases - Section A-Amendments to the FASB Accounting Standards Codification, Section B-Conforming Amendments Related to Leases and Section C-Background Information and Basis for Conclusions

In February 2016, the FASB issued ASU No. 2016-02, Leases, which requires lessees to recognize a right-to-use asset and a lease obligation for all leases on the balance sheet. Lessor accounting remains substantially similar to current GAAP. ASU 2016-02 supersedes Topic 840, Leases. This ASU is effective for annual and interim periods in fiscal years beginning after December 15, 2018. ASU 2016-02 mandates a modified retrospective transition method for all entities. Early adoption of this ASU is permitted. We anticipate that this ASU will impact our financial statements as it relates to the recognition of right-to-use assets and lease obligations on our Consolidated Balance Sheets. We have numerous lease agreements for our branch and loan production offices, which are currently accounted for as operating leases. We expect the new guidance will require these lease agreements to be included on our Balance Sheets as right-to-use assets with a corresponding lease liability. We expect that these changes to our Balance Sheets will impact our regulatory capital ratios. We have compiled a preliminary inventory of our leases and continue to evaluate the standard. We anticipate that this ASU will impact total assets and total liabilities presented on our Balance Sheets; however, we do not believe that it will materially impact our Statements of Comprehensive Income.

Fair Value Measurements

We use fair value measurements when recording and disclosing certain financial assets and liabilities. Debt securities, equity securities, trading assets and derivative financial instruments are recorded at fair value on a recurring basis. Additionally, from time to time, we may be required to record other assets at fair value on a nonrecurring basis, such as loans held for sale, impaired loans, other real estate owned, or OREO, and other repossessed assets, mortgage servicing rights, or MSRs, and certain other assets.

Fair value is the price that would be received to sell an asset or paid to transfer a liability in the principal or most advantageous market in an orderly transaction between market participants at the measurement date. An orderly transaction is a transaction that assumes exposure to the market for a period prior to the measurement date to allow for marketing activities that are usual and customary for transactions involving such assets or liabilities; it is not a forced transaction. In determining fair value, we use various valuation approaches, including market, income and cost approaches. The fair value standard establishes a hierarchy for inputs used in measuring fair value that maximizes the use of observable inputs and minimizes the use of unobservable inputs by requiring that observable inputs be used when available. Observable inputs are inputs that market participants would use in pricing an asset or liability, which are developed based on market data that we have obtained from independent sources. Unobservable inputs reflect our estimates of assumptions that market participants would use in pricing an asset or liability, which are developed based on the best information available in the circumstances.

The fair value hierarchy gives the highest priority to unadjusted quoted market prices in active markets for identical assets or liabilities (Level 1 measurement) and the lowest priority to unobservable inputs (Level 3 measurement). The fair value hierarchy is broken down into three levels based on the reliability of inputs as follows:

Level 1: valuation is based upon unadjusted quoted market prices for identical instruments traded in active markets.

Level 2: valuation is based upon quoted market prices for similar instruments traded in active markets, quoted market prices for identical or similar instruments traded in markets that are not active and model-based valuation techniques for which all significant assumptions are observable in the market or can be corroborated by market data.

Level 3: valuation is derived from other valuation methodologies, including discounted cash flow models and similar techniques that use significant assumptions not observable in the market. These unobservable assumptions reflect estimates of assumptions that market participants would use in determining fair value.

A financial instrument’s level within the fair value hierarchy is based on the lowest level of input that is significant to the fair value measurement. Our policy is to recognize transfers between any of the fair value hierarchy levels at the end of the reporting period in which the transfer occurred.

The following are descriptions of the valuation methodologies that we use for financial instruments recorded at fair value on either a recurring or nonrecurring basis.

Recurring Basis

Debt Securities Available-for-Sale

We obtain fair values for debt securities from a third-party pricing service which utilizes several sources for valuing fixed-income securities. We validate prices received from our pricing service through comparison to a secondary pricing service and broker quotes. We review the methodologies of the pricing service which provides us with a sufficient understanding of the valuation models, assumptions, inputs and pricing to reasonably measure the fair value of our debt securities. The market evaluation sources for debt securities include observable inputs rather than significant unobservable inputs and are classified as Level 2. The service provider utilizes pricing models that vary by asset class and include available trade, bid and other market information. Generally, the methodologies include broker quotes, proprietary models, and vast descriptive terms and conditions databases, and extensive quality control programs.

Equity Securities

Marketable equity securities that have an active, quotable market are classified as Level 1. Marketable equity securities that are quotable, but are thinly traded or inactive, are classified as Level 2. Marketable equity securities that are not readily traded and do not have a quotable market are classified as Level 3.

Trading Assets

We use quoted market prices to determine the fair value of our trading assets. Our trading assets are held in a Rabbi Trust under a deferred compensation plan and are invested in readily quoted mutual funds. Accordingly, these assets are classified as Level 1. Rabbi Trust assets are reported in other assets in the Consolidated Balance Sheets.

Derivative Financial Instruments

We use derivative instruments, including interest rate swaps for commercial loans with our customers, interest rate lock commitments and the sale of mortgage loans in the secondary market. We calculate the fair value for derivatives using widely accepted valuation techniques, including discounted cash flow analysis on the expected cash flows of each derivative. Each valuation considers the contractual terms of the derivative, including the period to maturity, and uses observable market-based inputs, such as interest rate curves and implied volatilities. Accordingly, derivatives are classified as Level 2. We incorporate credit valuation adjustments into the valuation models to appropriately reflect both our own nonperformance risk and the respective counterparties' nonperformance risk in calculating fair value measurements. In adjusting the fair value of our derivative contracts for the effect of nonperformance risk, we have considered the impact of netting and any applicable credit enhancements and collateral postings.

Nonrecurring Basis

Loans Held for Sale

Loans held for sale consist of 1-4 family residential loans originated for sale in the secondary market and, from time to time, certain loans transferred from the loan portfolio to loans held for sale, all of which are carried at the lower of cost or fair value. The fair value of 1-4 family residential loans is based on the principal or most advantageous market currently offered for similar loans using observable market data. The fair value of the loans transferred from the loan portfolio is based on the amounts offered for these loans in currently pending sales transactions. Loans held for sale carried at fair value are classified as Level 3.

Impaired Loans

Impaired loans are carried at the lower of carrying value or fair value. Fair value is determined as the recorded investment balance less any specific reserve. We establish specific reserves based on the following three impairment methods: 1) the present value of expected future cash flows discounted at the loan’s original effective interest rate; 2) the loan’s observable market price; or 3) the fair value of the collateral less estimated selling costs when the loan is collateral dependent and we expect to liquidate the collateral. However, if repayment is expected to come from the operation of the collateral, rather than liquidation, then we do not consider estimated selling costs in determining the fair value of the collateral. Collateral values are generally based upon appraisals by approved, independent state certified appraisers. Appraisals may be discounted based on our historical knowledge, changes in market conditions from the time of appraisal or our knowledge of the borrower and the borrower’s business. Impaired loans carried at fair value are classified as Level 3.

OREO and Other Repossessed Assets

OREO and other repossessed assets obtained in partial or total satisfaction of a loan are recorded at the lower of recorded investment in the loan or fair value less cost to sell. Subsequent to foreclosure, these assets are carried at the lower of the amount recorded at acquisition date or fair value less cost to sell. Accordingly, it may be necessary to record nonrecurring fair value adjustments. Fair value, when recorded, is generally based upon appraisals by approved, independent state certified appraisers. Like impaired loans, appraisals on OREO may be discounted based on our historical knowledge, changes in market conditions from the time of appraisal or other information available to us. OREO and other repossessed assets carried at fair value are classified as Level 3.

Mortgage Servicing Rights

The fair value of MSRs is determined by calculating the present value of estimated future net servicing cash flows, considering expected mortgage loan prepayment rates, discount rates, servicing costs and other economic factors, which are determined based on current market conditions. The expected rate of mortgage loan prepayments is the most significant factor driving the value of MSRs. MSRs are considered impaired if the carrying value exceeds fair value. The valuation model includes significant unobservable inputs; therefore, MSRs are classified as Level 3. MSRs are reported in other assets in the Consolidated Balance Sheets and are amortized into noninterest income in the Consolidated Statements of Comprehensive Income.

Other Assets

We measure certain other assets at fair value on a nonrecurring basis. Fair value is based on the application of lower of cost or fair value accounting, or write-downs of individual assets. Valuation methodologies used to measure fair value are consistent with overall principles of fair value accounting and consistent with those described above.

Financial Instruments

In addition to financial instruments recorded at fair value in our financial statements, fair value accounting guidance requires disclosure of the fair value of all of an entity’s assets and liabilities that are considered financial instruments. The majority of our assets and liabilities are considered financial instruments. Many of these instruments lack an available trading market as characterized by a willing buyer and willing seller engaged in an exchange transaction. Also, it is our general practice and intent to hold our financial instruments to maturity and to not engage in trading or sales activities with respect to such financial instruments. For fair value disclosure purposes, we substantially utilize the fair value measurement criteria as required and explained above. In cases where quoted fair values are not available, we use present value methods to determine the fair value of our financial instruments.

Cash and Cash Equivalents

The carrying amounts reported in the Consolidated Balance Sheets for cash and due from banks, including interest-bearing deposits, approximate fair value.

Loans

With the adoption of ASU 2016-01 on January 1, 2018, we refined our methodology to estimate the fair value of our loan portfolio to use the exit price notion as required by the standard. The guidance was applied on a prospective basis resulting in prior-periods no longer being comparable.

The fair value of variable rate loans that may reprice frequently at short-term market rates is based on carrying values adjusted for liquidity and credit risk. The fair value of variable rate loans that reprice at intervals of one year or longer, such as adjustable rate mortgage products, is estimated using discounted cash flow analyses that utilize interest rates currently being offered for similar loans and adjusted for liquidity and credit risk. The fair value of fixed rate loans is estimated using a discounted cash flow analysis that utilizes interest rates currently being offered for similar loans adjusted for liquidity and credit risk.

Bank Owned Life Insurance

Fair value approximates net cash surrender value of bank owned life insurance, or BOLI.

Federal Home Loan Bank, or FHLB, and Other Restricted Stock

It is not practical to determine the fair value of our FHLB and other restricted stock due to the restrictions placed on the transferability of these stocks; it is presented at carrying value.

Deposits

The fair values disclosed for deposits without defined maturities (e.g., noninterest and interest-bearing demand, money market and savings accounts) are by definition equal to the amounts payable on demand. The carrying amounts for variable rate, fixed-term time deposits approximate their fair values. Estimated fair values for fixed rate and other time deposits are based on discounted cash flow analysis using interest rates currently offered for time deposits with similar terms. The carrying amount of accrued interest approximates fair value.

Short-Term Borrowings

The carrying amounts of securities sold under repurchase agreements, or REPOs, and other short-term borrowings approximate their fair values.

Long-Term Borrowings

The fair values disclosed for fixed rate long-term borrowings are determined by discounting their contractual cash flows using current interest rates for long-term borrowings of similar remaining maturities. The carrying amounts of variable rate long-term borrowings approximate their fair values.

Junior Subordinated Debt Securities

The interest rate on the variable rate junior subordinated debt securities is reset quarterly; therefore, the carrying values approximate their fair values.

Loan Commitments and Standby Letters of Credit

Off-balance sheet financial instruments consist of commitments to extend credit and letters of credit. Except for interest rate lock commitments, estimates of the fair value of these off-balance sheet items are not made because of the short-term nature of these arrangements and the credit standing of the counterparties.

Other

Estimates of fair value are not made for items that are not defined as financial instruments, including such items as our core deposit intangibles and the value of our trust operations.

Allowance for Loans Losses

We maintain an allowance for loan losses, or ALL, at a level determined to be adequate to absorb estimated probable credit losses inherent within the loan portfolio as of the balance sheet date. We develop and document a systematic ALL methodology based on the following portfolio segments: 1) CRE, 2) C&I, 3) Commercial Construction, 4) Consumer Real Estate and 5) Other Consumer.

The following are key risks within each portfolio segment:

CRE—Loans secured by commercial purpose real estate, including both owner-occupied properties and investment properties for various purposes such as hotels, strip malls and apartments. Operations of the individual projects and global cash flows of the debtors are the primary sources of repayment for these loans. The condition of the local economy is an important indicator of risk, but there are also more specific risks depending on the collateral type and the business prospects of the lessee, if the project is not owner-occupied.

C&I—Loans made to operating companies or manufacturers for the purpose of production, operating capacity, accounts receivable, inventory or equipment financing. Cash flow from the operations of the company is the primary source of repayment for these loans. The condition of the local economy is an important indicator of risk, but there are also more specific risks depending on the industry of the company. Collateral for these types of loans often do not have sufficient value in a distressed or liquidation scenario to satisfy the outstanding debt.

Commercial Construction—Loans made to finance construction of buildings or other structures, as well as to finance the acquisition and development of raw land for various purposes. While the risk of these loans is generally confined to the construction period, if there are problems, the project may not be completed, and as such, may not provide sufficient cash flow on its own to service the debt or have sufficient value in a liquidation to cover the outstanding principal. The condition of the local economy is an important indicator of risk, but there are also more specific risks depending on the type of project and the experience and resources of the developer.

Consumer Real Estate—Loans secured by first and second liens such as home equity loans, home equity lines of credit and 1-4 family residential mortgages, including purchase money mortgages. The primary source of repayment for these loans is the income and assets of the borrower. The condition of the local economy, in particular the unemployment rate, is an important indicator of risk for this segment. The state of the local housing market can also have a significant impact on this segment because low demand and/or declining home values can limit the ability of borrowers to sell a property and satisfy the debt.

Other Consumer—Loans made to individuals that may be secured by assets other than 1-4 family residences, as well as unsecured loans. This segment includes auto loans, unsecured loans and lines and credit cards. The primary source of repayment for these loans is the income and assets of the borrower. The condition of the local economy, in particular the unemployment rate, is an important indicator of risk for this segment. The value of the collateral, if there is any, is less likely to be a source of repayment due to less certain collateral values.

We further assess risk within each portfolio segment by pooling loans with similar risk characteristics. For the commercial loan classes, the most important indicator of risk is the internally assigned risk rating, including pass, special mention and substandard. Consumer loans are pooled by type of collateral, lien position and loan to value, or LTV, for Consumer Real Estate loans. Historical loss rates are applied to these loan pools to determine the reserve for loans collectively evaluated for impairment.

The ALL methodology for groups of loans collectively evaluated for impairment is comprised of both a quantitative and qualitative analysis. A key assumption in the quantitative component of the reserve is the loss emergence period, or LEP. The LEP is an estimate of the average amount of time from the point at which a loss is incurred on a loan to the point at which the loss is confirmed. Another key assumption is the look-back period, or LBP, which represents the historical data period utilized to calculate loss rates.

Management monitors various credit quality indicators for both the commercial and consumer loan portfolios, including delinquency, nonperforming status and changes in risk ratings on a monthly basis.

Loans Credit Risk Rating

We continually monitor the commercial loan portfolio through an internal risk rating system. Loan risk ratings are assigned based upon the creditworthiness of the borrower and are reviewed on an ongoing basis according to our internal policies. Loans within the pass rating generally have a lower risk of loss than loans risk rated as special mention or substandard.

Our risk ratings are consistent with regulatory guidance and are as follows:

Pass—The loan is currently performing and is of high quality.

Special Mention—A special mention loan has potential weaknesses that warrant management’s close attention. If left uncorrected, these potential weaknesses may result in deterioration of the repayment prospects or in the strength of our credit position at some future date. Economic and market conditions, beyond the borrower’s control, may in the future necessitate this classification.

Substandard—A substandard loan is not adequately protected by the net worth and/or paying capacity of the borrower or by the collateral pledged, if any. Substandard loans have a well-defined weakness or weaknesses that jeopardize the liquidation of the debt. These loans are characterized by the distinct possibility that we will sustain some loss if the deficiencies are not corrected.

Derivative Financial Instruments

Interest Rate Swaps

In accordance with applicable accounting guidance for derivatives and hedging, all derivatives are recognized as either assets or liabilities on the balance sheet at fair value. Interest rate swaps are contracts in which a series of interest rate flows (fixed and variable) are exchanged over a prescribed period. The notional amounts on which the interest payments are based are not exchanged. These derivative positions relate to transactions in which we enter into an interest rate swap with a commercial customer while at the same time entering into an offsetting interest rate swap with another financial institution. In connection with each transaction, we agree to pay interest to the customer on a notional amount at a variable interest rate and receive interest from the customer on the same notional amount at a fixed rate. At the same time, we agree to pay another financial institution the same fixed interest rate on the same notional amount and receive the same variable interest rate on the same notional amount. The transaction allows our customer to effectively convert a variable rate loan to a fixed rate loan with us receiving a variable rate. These agreements could have floors or caps on the contracted interest rates.

Pursuant to our agreements with various financial institutions, we may receive collateral or may be required to post collateral based upon mark-to-market positions. Beyond unsecured threshold levels, collateral in the form of cash or securities may be made available to counterparties of interest rate swap transactions. Based upon our current positions and related future collateral requirements relating to them, we believe any effect on our cash flow or liquidity position to be immaterial.

Derivatives contain an element of credit risk, the possibility that we will incur a loss because a counterparty, which may be a financial institution or a customer, fails to meet its contractual obligations. All derivative contracts with financial institutions may be executed only with counterparties approved by our Asset and Liability Committee, or ALCO, and derivatives with customers may only be executed with customers within credit exposure limits approved by our Senior Loan Committee. Interest rate swaps are considered derivatives, but are not accounted for using hedge accounting. As such, changes in the estimated fair value of the derivatives are recorded in current earnings and included in other noninterest income in the Consolidated Statements of Comprehensive Income.

Interest Rate Lock Commitments and Forward Sale Contracts

In the normal course of business, we sell originated mortgage loans into the secondary mortgage loan market. We also offer interest rate lock commitments to potential borrowers. The commitments are generally for a period of 60 days and guarantee a specified interest rate for a loan if underwriting standards are met, but the commitment does not obligate the potential borrower to close on the loan. Accordingly, some commitments expire prior to becoming loans. We may encounter pricing risks if interest rates increase significantly before the loan can be closed and sold. We may utilize forward sale contracts in order to mitigate this pricing risk. Whenever a customer desires these products, a mortgage originator quotes a secondary market rate guaranteed for that day by the investor. The rate lock is executed between the mortgagee and us and in turn a forward sale contract may be executed between us and the investor. Both the rate lock commitment and the corresponding forward sale contract for each customer are considered derivatives, but are not accounted for using hedge accounting. As such, changes in the estimated fair value of the derivatives during the commitment period are recorded in current earnings and included in mortgage banking in the Consolidated Statements of Comprehensive Income.

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Earnings Per Share (Tables)

3 Months Ended

Mar. 31, 2018

Earnings Per Share [Abstract]

Reconciles Numerators and Denominators of Basic Earnings Per Share with Diluted Earnings Per Share

The following table reconciles the numerators and denominators of basic and diluted earnings per share for the periods presented:

	Three Months Ended March 31,
(in thousands, except share and per share data)	2018		2017
Numerator for Earnings per Share—Basic:
Net income	$	26,163	$	18,188
Less: Income allocated to participating shares	80		60
Net Income Allocated to Shareholders	$	26,083	$	18,128
Numerator for Earnings per Share—Diluted:
Net income	$	26,163	$	18,188
Net Income Available to Shareholders	$	26,163	$	18,188
Denominators for Earnings per Share:
Weighted Average Shares Outstanding—Basic	34,756,726		34,690,250
Add: Potentially dilutive shares	242,439		222,011
Denominator for Treasury Stock Method—Diluted	34,999,165		34,912,261
Weighted Average Shares Outstanding—Basic	34,756,726		34,690,250
Add: Average participating shares outstanding	106,722		115,395
Denominator for Two-Class Method—Diluted	34,863,448		34,805,645
Earnings per share—basic	$	0.75	$	0.52
Earnings per share—diluted	$	0.75	$	0.52
Warrants considered anti-dilutive excluded from potentially dilutive shares - exercise price $31.53 per share, expires January 2019	400,722		447,103
Restricted stock considered anti-dilutive excluded from potentially dilutive shares	90,298		79,544

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Fair Value Measurement (Tables)

3 Months Ended

Mar. 31, 2018

Fair Value Disclosures [Abstract]

Assets and Liabilities Measured at Fair Value on Recurring Basis

The following tables present our assets and liabilities that are measured at fair value on a recurring basis by fair value hierarchy level at March 31, 2018 and December 31, 2017. There were no transfers between Level 1 and Level 2 for items measured at fair value on a recurring basis during the periods presented.

	March 31, 2018
(dollars in thousands)	Level 1		Level 2		Level 3		Total
ASSETS
Debt securities available-for-sale:
U.S. Treasury securities	$	—	$	14,661	$	—	$	14,661
Obligations of U.S. government corporations and agencies	—		160,589		—		160,589
Collateralized mortgage obligations of U.S. government corporations and agencies	—		102,582		—		102,582
Residential mortgage-backed securities of U.S. government corporations and agencies	—		30,683		—		30,683
Commercial mortgage-backed securities of U.S. government corporations and agencies	—		248,798		—		248,798
Obligations of states and political subdivisions	—		125,141		—		125,141
Total Debt Securities Available-for-Sale	—		682,454		—		682,454
Marketable equity securities(1)	—		5,196		—		5,196
Total Securities	—		687,650		—		687,650
Trading securities held in a Rabbi Trust	5,048		—		—		5,048
Derivative financial assets:
Interest rate swaps	—		4,669		—		4,669
Interest rate lock commitments	—		271		—		271
Total Assets	$	5,048	$	692,590	$	—	$	697,638
LIABILITIES
Derivative financial liabilities:
Interest rate swaps	$	—	$	4,765	$	—	$	4,765
Forward sale contracts	—		24		—		24
Total Liabilities	$	—	$	4,789	$	—	$	4,789

⁽¹⁾ASU 2016-01 was adopted January 1, 2018, resulting in separate classification of our marketable equity securities previously included in available-for-sale securities.

	December 31, 2017
(dollars in thousands)	Level 1		Level 2		Level 3		Total
ASSETS
Debt securities available-for-sale:
U.S. Treasury securities	$	—	$	19,789	$	—	$	19,789
Obligations of U.S. government corporations and agencies	—		162,193		—		162,193
Collateralized mortgage obligations of U.S. government corporations and agencies	—		108,688		—		108,688
Residential mortgage-backed securities of U.S. government corporations and agencies	—		32,854		—		32,854
Commercial mortgage-backed securities of U.S. government corporations and agencies	—		242,221		—		242,221
Obligations of states and political subdivisions	—		127,402		—		127,402
Marketable equity securities	—		5,144		—		5,144
Total Debt Securities Available-for-Sale	—		698,291		—		698,291
Total Securities	—		698,291		—		698,291
Trading securities held in a Rabbi Trust	5,080		—		—		5,080
Derivative financial assets:
Interest rate swaps	—		3,074		—		3,074
Interest rate lock commitments	—		226		—		226
Total Assets	$	5,080	$	701,591	$	—	$	706,671
LIABILITIES
Derivative financial liabilities:
Interest rate swaps	$	—	$	3,055	$	—	$	3,055
Forward sale contracts	—		5		—		5
Total Liabilities	$	—	$	3,060	$	—	$	3,060

Assets Measured at Estimated Fair Value on Nonrecurring Basis by Fair Value Hierarchy

The following table presents our assets that are measured at fair value on a nonrecurring basis by the fair value hierarchy level as of the dates presented:

	March 31, 2018								December 31, 2017
(dollars in thousands)	Level 1		Level 2		Level 3		Total		Level 1		Level 2		Level 3		Total
ASSETS(1)
Loans held for sale	$	—	$	—	$	—	$	—	$	—	$	—	$	—	$	—
Impaired loans	—		—		6,551		6,551		—		—		6,759		6,759
Other real estate owned	—		—		2,880		2,880		—		—		444		444
Mortgage servicing rights	—		—		106		106		—		—		178		178
Total Assets	$	—	$	—	$	9,537	$	9,537	$	—	$	—	$	7,381	$	7,381
(1)This table presents only the nonrecurring items that are recorded at fair value in our financial statements.

Carrying Values and Fair Values of Financial Instruments

The carrying values and fair values of our financial instruments at March 31, 2018 and December 31, 2017 are presented in the following tables:

	Carrying Value(1)		Fair Value Measurements at March 31, 2018
(dollars in thousands)			Total		Level 1		Level 2		Level 3
ASSETS
Cash and due from banks, including interest-bearing deposits	$	112,849	$	112,849	$	112,849	$	—	$	—
Securities	687,650		687,650		—		687,650		—
Loans held for sale	3,283		3,377		—		—		3,377
Portfolio loans, net	5,671,567		5,530,443		—		—		5,530,443
Bank owned life insurance	72,629		72,629		—		72,629		—
FHLB and other restricted stock	29,769		29,769		—		—		29,769
Trading securities held in a Rabbi Trust	5,048		5,048		5,048		—		—
Mortgage servicing rights	4,182		5,023		—		—		5,023
Interest rate swaps	4,669		4,669		—		4,669		—
Interest rate lock commitments	271		271		—		271		—
LIABILITIES
Deposits	$	5,387,094	$	5,372,506	$	—	$	—	$	5,372,506
Securities sold under repurchase agreements	44,617		44,617		—		—		44,617
Short-term borrowings	525,000		525,000		—		—		525,000
Long-term borrowings	46,684		46,892		—		—		46,892
Junior subordinated debt securities	45,619		45,619		—		—		45,619
Interest rate swaps	4,765		4,765		—		4,765		—
Interest rate lock commitments	24		24		—		24		—
(1) As reported in the Consolidated Balance Sheets

	Carrying Value(1)		Fair Value Measurements at December 31, 2017
(dollars in thousands)			Total		Level 1		Level 2		Level 3
ASSETS
Cash and due from banks, including interest-bearing deposits	$	117,152	$	117,152	$	117,152	$	—	$	—
Securities	698,291		698,291		—		698,291		—
Loans held for sale	4,485		4,583		—		—		4,583
Portfolio loans, net	5,705,059		5,690,292		—		—		5,690,292
Bank owned life insurance	72,150		72,150		—		72,150		—
FHLB and other restricted stock	29,270		29,270		—		—		29,270
Trading securities held in a Rabbi Trust	5,080		5,080		5,080		—		—
Mortgage servicing rights	4,133		4,571		—		—		4,571
Interest rate swaps	3,074		3,074		—		3,074		—
Interest rate lock commitments	226		226		—		226		—
LIABILITIES
Deposits	$	5,427,891	$	5,426,928	$	—	$	—	$	5,426,928
Securities sold under repurchase agreements	50,161		50,161		—		—		50,161
Short-term borrowings	540,000		540,000		—		—		540,000
Long-term borrowings	47,301		47,618		—		—		47,618
Junior subordinated debt securities	45,619		45,619		—		—		45,619
Interest rate swaps	3,055		3,055		—		3,055		—
Interest rate lock commitments	5		5		—		5		—
(1) As reported in the Consolidated Balance Sheets

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Securities (Tables)

3 Months Ended

Mar. 31, 2018

Investments, Debt and Equity Securities [Abstract]

Composition of Securities

The following table presents the fair values of our securities portfolio at the dates presented:

(dollars in thousands)	March 31, 2018	December 31, 2017
Debt securities available for sale	682,454	693,147
Marketable equity securities	5,196	5,144
Total Securities	687,650	698,291

Debt Securities Available for Sale

The following tables present the amortized cost and fair value of debt securities available for sale as of March 31, 2018 and debt and equity securities available for sale as of December 31, 2017:

	March 31, 2018									December 31, 2017
(dollars in thousands)	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value		Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
U.S. Treasury securities	$	14,951	$	—	$	(290	)	$	14,661	$	19,943	$	—	$	(154	)	$	19,789
Obligations of U.S. government corporations and agencies	161,844		62		(1,317		)	160,589		162,045		341		(193		)	162,193
Collateralized mortgage obligations of U.S. government corporations and agencies	105,063		2		(2,483		)	102,582		109,916		93		(1,321		)	108,688
Residential mortgage-backed securities of U.S. government corporations and agencies	30,700		443		(460		)	30,683		32,388		679		(213		)	32,854
Commercial mortgage-backed securities of U.S. government corporations and agencies (1)	255,043		—		(6,245		)	248,798		244,018		247		(2,044		)	242,221
Obligations of states and political subdivisions	122,650		2,563		(72		)	125,141		123,159		4,285		(42		)	127,402
Total Debt Securities Available-for-Sale	690,251		3,070		(10,867		)	682,454		691,469		5,645		(3,967		)	693,147
Total equity securities (2)	—		—		—			—		3,815		1,330		(1		)	5,144
Total Securities	$	690,251	$	3,070	$	(10,867	)	$	682,454	$	695,284	$	6,975	$	(3,968	)	$	698,291

⁽¹⁾ Includes a $5.9 million security purchase that was pending settlement as of December 31, 2017.

⁽²⁾ ASU 2016-01 was adopted January 1, 2018, resulting in separate classification of our marketable equity securities previously included in available-for-sale securities.

Schedule of Temporally Impaired Debt Securities

The following tables present the fair value and the age of gross unrealized losses on debt securities available for sale by investment category as of the dates presented:

	March 31, 2018
	Less Than 12 Months						12 Months or More						Total
(dollars in thousands)	Number of Securities	Fair Value		Unrealized Losses			Number of Securities	Fair Value		Unrealized Losses			Number of Securities	Fair Value		Unrealized Losses
U.S. Treasury securities	2	$	14,661	$	(290	)	—	$	—	$	—		2	$	14,661	$	(290	)
Obligations of U.S. government corporations and agencies	16	130,823		(1,274		)	1	10,000		(43		)	17	140,823		(1,317		)
Collateralized mortgage obligations of U.S. government corporations and agencies	8	55,695		(800		)	7	43,184		(1,683		)	15	98,879		(2,483		)
Residential mortgage-backed securities of U.S. government corporations and agencies	3	4,861		(106		)	2	7,976		(354		)	5	12,837		(460		)
Commercial mortgage-backed securities of U.S. government corporations and agencies	22	201,051		(4,170		)	5	47,747		(2,075		)	27	248,798		(6,245		)
Obligations of states and political subdivisions	5	23,700		(72		)	—	—		—			5	23,700		(72		)
Total Temporarily Impaired Debt Securities	56	$	430,791	$	(6,712	)	15	$	108,907	$	(4,155	)	71	$	539,698	$	(10,867	)

	December 31, 2017
	Less Than 12 Months						12 Months or More						Total
(dollars in thousands)	Number of Securities	Fair Value		Unrealized Losses			Number of Securities	Fair Value		Unrealized Losses			Number of Securities	Fair Value		Unrealized Losses
U.S. Treasury securities	3	$	19,789	$	(154	)	—	$	—	$	—		3	$	19,789	$	(154	)
Obligations of U.S. government corporations and agencies	9	63,635		(144		)	1	10,017		(49		)	10	73,652		(193		)
Collateralized mortgage obligations of U.S. government corporations and agencies	7	47,465		(248		)	7	45,809		(1,073		)	14	93,274		(1,321		)
Residential mortgage-backed securities of U.S. government corporations and agencies	1	2,333		(10		)	2	8,638		(203		)	3	10,971		(213		)
Commercial mortgage-backed securities of U.S. government corporations and agencies	14	128,300		(775		)	5	48,746		(1,269		)	19	177,046		(2,044		)
Obligations of states and political subdivisions	2	10,330		(42		)	—	—		—			2	10,330		(42		)
Total Temporarily Impaired Debt Securities	36	$	271,852	$	(1,373	)	15	$	113,210	$	(2,594	)	51	$	385,062	$	(3,967	)

Unrealized Gains and Losses, Net of Tax, of Debt Securities Available for Sale

The following table presents net unrealized gains and losses, net of tax, on debt securities available-for-sale included in accumulated other comprehensive income/(loss), for the periods presented:

	March 31, 2018									December 31, 2017
(dollars in thousands)	Gross Unrealized Gains			Gross Unrealized Losses			Net Unrealized Gains/ (Losses)			Gross Unrealized Gains			Gross Unrealized Losses			Net Unrealized Gains/ (Losses)
Total unrealized gains(losses) on debt securities available-for-sale	$	3,070		$	(10,867	)	$	(7,797	)	$	5,645		$	(3,967	)	$	1,678
Income tax (expense)benefit	(652		)	2,308			1,656			(1,982		)	1,393			(589		)
Net Unrealized Gains/(losses), Net of Tax Included in Accumulated Other Comprehensive Income/(Loss)	$	2,418		$	(8,559	)	$	(6,141	)	$	3,663		$	(2,574	)	$	1,089

Contractual Maturity of Debt Securities Available-for-Sale Securities

The amortized cost and fair value of debt securities available-for-sale at March 31, 2018 by contractual maturity are included in the table below. Actual maturities may differ from contractual maturities because issuers may have the right to call or prepay obligations with or without call or prepayment penalties.

	March 31, 2018
(dollars in thousands)	Amortized Cost		Fair Value
Obligations of the U.S. Treasury, U.S. government corporations and agencies, and obligations of states and political subdivisions
Due in one year or less	$	43,472	$	43,372
Due after one year through five years	148,616		148,787
Due after five years through ten years	78,565		78,767
Due after ten years	28,792		29,465
	299,445		300,391
Collateralized mortgage obligations of U.S. government corporations and agencies	105,063		102,582
Residential mortgage-backed securities of U.S. government corporations and agencies	30,700		30,683
Commercial mortgage-backed securities of U.S. government corporations and agencies	255,043		248,798
Total Debt Securities Available-for-Sale	$	690,251	$	682,454

Unrealized Gains and Losses on Marketable Securities

The following table presents realized and unrealized net gains and losses for our marketable equity securities for the periods presented:

	Three months ended March 31,
(dollars in thousands)	2018		2017
Marketable Equity Securities
Net gains/losses recognized during the period	$	52	$	733
Less: Net gains/losses recognized for equity securities sold during the period	—		370
Unrealized Gains/Losses Recognized on Equity Securities Still Held	$	52	$	363

XML

Loans and Loans Held for Sale (Tables)

3 Months Ended

Mar. 31, 2018

Receivables [Abstract]

Composition of Loans

The following table indicates the composition of loans as of the dates presented:

(dollars in thousands)	March 31, 2018		December 31, 2017
Commercial
Commercial real estate	$	2,760,891	$	2,685,994
Commercial and industrial	1,406,950		1,433,266
Commercial construction	324,141		384,334
Total Commercial Loans	4,491,982		4,503,594
Consumer
Residential mortgage	692,385		698,774
Home equity	474,850		487,326
Installment and other consumer	66,890		67,204
Consumer construction	4,506		4,551
Total Consumer Loans	1,238,631		1,257,855
Total Portfolio Loans	5,730,613		5,761,449
Loans held for sale	3,283		4,485
Total Loans	$	5,733,896	$	5,765,934

Restructured Loans for Periods Presented

The following tables present the restructured loans by loan segment and by type of concession for the three months ended March 31, 2018 and 2017:

	Three Months Ended March 31, 2018								Three Months Ended March 31, 2017
(dollars in thousands)	Number of Loans	Pre-Modification Outstanding Recorded Investment(1)		Post-Modification Outstanding Recorded Investment(1)		Total  Difference in Recorded Investment			Number of Loans	Pre-Modification Outstanding Recorded Investment(1)		Post-Modification Outstanding Recorded Investment(1)		Total  Difference in Recorded Investment
Totals by Loan Segment
Commercial real estate
Commercial and industrial
Maturity date extension	2	$	768	$	708	$	(60	)	—	$	—	$	—	$	—
Principal deferral	6	5,355		5,333		(22		)	—	—		—		—
Total Commercial and Industrial	8	6,123		6,041		(82		)	—	—		—		—
Commercial Construction		.
Chapter 7 bankruptcy(2)	2	158		157		(1		)	—	—		—		—
Total Commercial Construction	2	158		157		(1		)	—	—		—		—
Home equity
Chapter 7 bankruptcy(2)	9	578		555		(23		)	6	269		266		(3		)
Maturity date extension and interest rate reduction	—	—		—		—			1	173		172		(1		)
Total Home Equity	9	578		555		(23		)	7	442		438		(4		)
Installment and other consumer
Chapter 7 bankruptcy(2)	2	17		17		—			—	—		—		—
Total Installment and Other Consumer	2	17		17		—			—	—		—		—
Totals by Concession Type
Chapter 7 bankruptcy(2)	13	$	753	$	729	$	(24	)	6	$	269	$	266	$	(3	)
Maturity date extension	2	768		708		(60		)	—	—		—		—
Maturity date extension and interest rate reduction	—	—		—		—			1	173		172		(1		)
Principal deferral	6	5,355		5,333		(22		)	—	—		—		—
Total	21	$	6,876	$	6,770	$	(106	)	7	$	442	$	438	$	(4	)
(1) Excludes loans that were fully paid off or fully charged-off by period end. The pre-modification balance represents the balance outstanding prior to modification. The post-modification balance represents the outstanding balance at period end. (2) Chapter 7 bankruptcy loans where the debt has been legally discharged through the bankruptcy court and not reaffirmed.

The following table summarizes restructured loans as of the dates presented:

	March 31, 2018						December 31, 2017
(dollars in thousands)	Performing TDRs		Nonperforming TDRs		Total TDRs		Performing TDRs		Nonperforming TDRs		Total TDRs
Commercial real estate	$	2,298	$	944	$	3,242	$	2,579	$	967	$	3,546
Commercial and industrial	9,403		3,036		12,439		3,946		3,197		7,143
Commercial construction	2,400		414		2,814		2,420		2,413		4,833
Residential mortgage	2,178		2,640		4,818		2,039		3,585		5,624
Home equity	3,713		1,520		5,233		3,885		979		4,864
Installment and other consumer	43		6		49		32		9		41
Total	$	20,035	$	8,560	$	28,595	$	14,901	$	11,150	$	26,051

Summary of Nonperforming Assets

The following table is a summary of nonperforming assets as of the dates presented:

	Nonperforming Assets
(dollars in thousands)	March 31, 2018		December 31, 2017
Nonperforming Assets
Nonaccrual loans	$	12,775	$	12,788
Nonaccrual TDRs	8,560		11,150
Total Nonaccrual Loans	21,335		23,938
OREO	2,920		469
Total Nonperforming Assets	$	24,255	$	24,407

XML

Allowance for Loan Losses (Tables)

3 Months Ended

Mar. 31, 2018

Receivables [Abstract]

Age Analysis of Past Due Loans Segregated by Class of Loans

The following tables present the age analysis of past due loans segregated by class of loans as of the dates presented:

	March 31, 2018
(dollars in thousands)	Current		30-59 Days Past Due		60-89 Days Past Due		Non - performing		Total Past Due Loans		Total Loans
Commercial real estate	$	2,755,336	$	1,162	$	441	$	3,952	$	5,555	$	2,760,891
Commercial and industrial	1,401,154		1,059		120		4,617		5,796		1,406,950
Commercial construction	321,900		368		—		1,873		2,241		324,141
Residential mortgage	682,092		3,125		453		6,715		10,293		692,385
Home equity	468,762		1,603		376		4,109		6,088		474,850
Installment and other consumer	66,551		189		81		69		339		66,890
Consumer construction	4,506		—		—		—		—		4,506
Loans held for sale	3,283		—		—		—		—		3,283
Total	$	5,703,584	$	7,506	$	1,471	$	21,335	$	30,312	$	5,733,896

	December 31, 2017
(dollars in thousands)	Current		30-59 Days Past Due		60-89 Days Past Due		Non - performing		Total Past Due Loans		Total Loans
Commercial real estate	$	2,681,395	$	997	$	134	$	3,468	$	4,599	$	2,685,994
Commercial and industrial	1,426,754		420		446		5,646		6,512		1,433,266
Commercial construction	377,968		2,473		20		3,873		6,366		384,334
Residential mortgage	687,195		2,975		1,439		7,165		11,579		698,774
Home equity	480,956		2,065		590		3,715		6,370		487,326
Installment and other consumer	66,770		193		170		71		434		67,204
Consumer construction	4,551		—		—		—		—		4,551
Loans held for sale	4,485		—		—		—		—		4,485
Total	$	5,730,074	$	9,123	$	2,799	$	23,938	$	35,860	$	5,765,934

Recorded Investment in Commercial Loan Classes by Internally Assigned Risk Ratings

The following tables present the recorded investment in commercial loan classes by internally assigned risk ratings as of the dates presented:

	March 31, 2018
(dollars in thousands)	Commercial Real Estate		% of Total		Commercial and Industrial		% of Total		Commercial Construction		% of Total		Total		% of Total
Pass	$	2,625,232	95.1	%	$	1,294,478	92.0	%	$	303,985	93.8	%	$	4,223,695	94.0	%
Special mention	68,204		2.5	%	65,557		4.7	%	14,919		4.6	%	148,680		3.3	%
Substandard	67,455		2.4	%	46,915		3.3	%	5,237		1.6	%	119,607		2.7	%
Total	$	2,760,891	100.0	%	$	1,406,950	100.0	%	$	324,141	100.0	%	$	4,491,982	100.0	%
	December 31, 2017
(dollars in thousands)	Commercial Real Estate		% of Total		Commercial and Industrial		% of Total		Commercial Construction		% of Total		Total		% of Total
Pass	$	2,588,847	96.4	%	$	1,345,810	93.9	%	$	368,105	95.8	%	$	4,302,762	95.5	%
Special mention	66,436		2.5	%	54,320		3.8	%	9,345		2.4	%	130,101		2.9	%
Substandard	30,711		1.1	%	33,136		2.3	%	6,884		1.8	%	70,731		1.6	%
Total	$	2,685,994	100.0	%	$	1,433,266	100.0	%	$	384,334	100.0	%	$	4,503,594	100.0	%

Recorded Investment in Consumer Loan Classes by Performing and Nonperforming Status

The following tables present the recorded investment in consumer loan classes by performing and nonperforming status as of the dates presented:

	March 31, 2018
(dollars in thousands)	Residential Mortgage		% of Total		Home Equity		% of Total		Installment and other consumer		% of Total		Consumer Construction		% of Total		Total		% of Total
Performing	$	685,670	99.0	%	$	470,741	99.1	%	$	66,821	99.9	%	$	4,506	100.0	%	$	1,227,738	99.1	%
Nonperforming	6,715		1.0	%	4,109		0.9	%	69		0.1	%	—		—	%	10,893		0.9	%
Total	$	692,385	100.0	%	$	474,850	100.0	%	$	66,890	100.0	%	$	4,506	100.0	%	$	1,238,631	100.0	%
	December 31, 2017
(dollars in thousands)	Residential Mortgage		% of Total		Home Equity		% of Total		Installment and other consumer		% of Total		Consumer Construction		% of Total		Total		% of Total
Performing	$	691,609	99.0	%	$	483,611	99.2	%	$	67,133	99.9	%	$	4,551	100.0	%	$	1,246,904	99.1	%
Nonperforming	7,165		1.0	%	3,715		0.8	%	71		0.1	%	—		—	%	10,951		0.9	%
Total	$	698,774	100.0	%	$	487,326	100.0	%	$	67,204	100.0	%	$	4,551	100.0	%	$	1,257,855	100.0	%

Investments in Loans Considered to be Impaired and Related Information on Impaired Loans

The following tables summarize investments in loans considered to be impaired and related information on those impaired loans as of the dates presented:

	March 31, 2018						December 31, 2017
(dollars in thousands)	Recorded Investment		Unpaid Principal Balance		Related Allowance		Recorded Investment		Unpaid Principal Balance		Related Allowance
With a related allowance recorded:
Commercial real estate	$	—	$	—	$	—	$	—	$	—	$	—
Commercial and industrial	656		671		537		1,735		1,787		29
Commercial construction	—		—		—		—		—		—
Consumer real estate	—		—		—		21		21		21
Other consumer	39		39		39		27		27		27
Total with a Related Allowance Recorded	695		710		576		1,783		1,835		77
Without a related allowance recorded:
Commercial real estate	3,774		4,034		—		3,546		3,811		—
Commercial and industrial	11,917		13,972		—		5,549		7,980		—
Commercial construction	3,444		4,954		—		5,464		8,132		—
Consumer real estate	10,052		10,987		—		10,467		11,357		—
Other consumer	10		17		—		14		22		—
Total without a Related Allowance Recorded	29,197		33,964		—		25,040		31,302		—
Total:
Commercial real estate	3,774		4,034		—		3,546		3,811		—
Commercial and industrial	12,573		14,643		537		7,284		9,767		29
Commercial construction	3,444		4,954		—		5,464		8,132		—
Consumer real estate	10,052		10,987		—		10,488		11,378		21
Other consumer	49		56		39		41		49		27
Total	$	29,892	$	34,674	$	576	$	26,823	$	33,137	$	77

The following table summarizes average recorded investment in and interest income recognized on loans considered to be impaired for the periods presented:

	Three Months Ended
	March 31, 2018				March 31, 2017
(dollars in thousands)	Average Recorded Investment		Interest Income Recognized		Average Recorded Investment		Interest Income Recognized
With a related allowance recorded:
Commercial real estate	$	—	$	—	$	—	$	—
Commercial and industrial	586		11		10,008		72
Commercial construction	—		—		—		—
Consumer real estate	—		—		26		—
Other consumer	42		1		1		—
Total with a Related Allowance Recorded	628		12		10,035		72
Without a related allowance recorded:
Commercial real estate	3,817		43		8,581		33
Commercial and industrial	6,688		110		11,410		43
Commercial construction	3,446		36		6,239		37
Consumer real estate	10,816		138		11,692		129
Other consumer	12		—		22		—
Total without a Related Allowance Recorded	24,779		327		37,944		242
Total:
Commercial real estate	3,817		43		8,581		33
Commercial and industrial	7,274		121		21,418		115
Commercial construction	3,446		36		6,239		37
Consumer real estate	10,816		138		11,718		129
Other consumer	54		1		23		—
Total	$	25,407	$	339	$	47,979	$	314

Summary of Allowance for Loan Losses

The following tables detail activity in the ALL for the periods presented:

	Three Months Ended March 31, 2018
(dollars in thousands)	Commercial Real Estate			Commercial and Industrial			Commercial Construction			Consumer Real Estate			Other Consumer			Total Loans
Balance at beginning of period	$	27,235		$	8,966		$	13,167		$	5,479		$	1,543		$	56,390
Charge-offs	—			(829		)	—			(161		)	(460		)	(1,450		)
Recoveries	49			117			1,129			238			101			1,634
Net (Charge-offs)/ Recoveries	49			(712		)	1,129			77			(359		)	184
Provision for loan losses	3,679			2,218			(3,575		)	(138		)	288			2,472
Balance at End of Period	$	30,963		$	10,472		$	10,721		$	5,418		$	1,472		$	59,046
	Three Months Ended March 31, 2017
(dollars in thousands)	Commercial Real Estate			Commercial and Industrial			Commercial Construction			Consumer Real Estate			Other Consumer			Total Loans
Balance at beginning of period	$	19,976		$	10,810		$	13,999		$	6,095		$	1,895		$	52,775
Charge-offs	(390		)	(715		)	(644		)	(759		)	(434		)	(2,942		)
Recoveries	78			187			256			103			176			800
Net (Charge-offs)/ Recoveries	(312		)	(528		)	(388		)	(656		)	(258		)	(2,142		)
Provision for loan losses	906			2,962			491			517			307			5,183
Balance at End of Period	$	20,570		$	13,244		$	14,102		$	5,956		$	1,944		$	55,816

Summary of Allowance for Loan Losses and Recorded Investments

The following tables present the ALL and recorded investments in loans by category as of the periods presented:

	March 31, 2018
	Allowance for Loan Losses						Portfolio Loans
(dollars in thousands)	Individually Evaluated for Impairment		Collectively Evaluated for Impairment		Total		Individually Evaluated for Impairment		Collectively Evaluated for Impairment		Total
Commercial real estate	$	—	$	30,963	$	30,963	$	3,774	$	2,757,117	$	2,760,891
Commercial and industrial	537		9,935		10,472		12,573		1,394,377		1,406,950
Commercial construction	—		10,721		10,721		3,444		320,697		324,141
Consumer real estate	—		5,418		5,418		10,052		1,161,689		1,171,741
Other consumer	39		1,433		1,472		49		66,841		66,890
Total	$	576	$	58,470	$	59,046	$	29,892	$	5,700,721	$	5,730,613
	December 31, 2017
	Allowance for Loan Losses						Portfolio Loans
(dollars in thousands)	Individually Evaluated for Impairment		Collectively Evaluated for Impairment		Total		Individually Evaluated for Impairment		Collectively Evaluated for Impairment		Total
Commercial real estate	$	—	$	27,235	$	27,235	$	3,546	$	2,682,448	$	2,685,994
Commercial and industrial	29		8,937		8,966		7,284		1,425,982		1,433,266
Commercial construction	—		13,167		13,167		5,464		378,870		384,334
Consumer real estate	21		5,458		5,479		10,488		1,180,163		1,190,651
Other consumer	27		1,516		1,543		41		67,163		67,204
Total	$	77	$	56,313	$	56,390	$	26,823	$	5,734,626	$	5,761,449

XML

Derivative Instruments and Hedging Activities (Tables)

3 Months Ended

Mar. 31, 2018

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Value of Derivative Assets and Derivative Liabilities

The following tables indicate the amounts representing the value of derivative assets and derivative liabilities as of the dates presented:

	Derivatives (included in Other Assets)				Derivatives (included in Other Liabilities)
(dollars in thousands)	March 31, 2018		December 31, 2017		March 31, 2018		December 31, 2017
Derivatives not Designated as Hedging Instruments:
Interest Rate Swap Contracts- Commercial Loans
Fair value	$	4,669	$	3,074	$	4,765	$	3,055
Notional amount	253,580		263,841		253,580		263,841
Net collateral received/posted	2,011		—		—		1,448
Interest Rate Lock Commitments- Mortgage Loans
Fair value	271		226		—		—
Notional amount	9,710		6,860		—		—
Forward Sale Contracts- Mortgage Loans
Fair value	—		—		24		5
Notional amount	$	—	$	—	$	9,165	$	6,580

Schedule of Offsetting Derivative Assets

The following tables indicate the gross amounts of commercial loan swap derivative assets and derivative liabilities, the amounts offset and the carrying values in the Consolidated Balance Sheets as of the dates presented:

	Derivatives (included in Other Assets)						Derivatives (included in Other Liabilities)
(dollars in thousands)	March 31, 2018			December 31, 2017			March 31, 2018			December 31, 2017
Derivatives not Designated as Hedging Instruments:
Gross amounts recognized	$	5,818		$	4,974		$	5,914		$	4,955
Gross amounts offset	(1,149		)	(1,900		)	(1,149		)	(1,900		)
Net Amounts Presented in the Consolidated Balance Sheets	4,669			3,074			4,765			3,055
Gross amounts not offset(1)	(2,011		)	—			—			(1,448		)
Net Amount	$	2,658		$	3,074		$	4,765		$	1,607

⁽¹⁾ Amounts represent received/posted collateral.

Schedule of Offsetting Liabilities

The following tables indicate the gross amounts of commercial loan swap derivative assets and derivative liabilities, the amounts offset and the carrying values in the Consolidated Balance Sheets as of the dates presented:

	Derivatives (included in Other Assets)						Derivatives (included in Other Liabilities)
(dollars in thousands)	March 31, 2018			December 31, 2017			March 31, 2018			December 31, 2017
Derivatives not Designated as Hedging Instruments:
Gross amounts recognized	$	5,818		$	4,974		$	5,914		$	4,955
Gross amounts offset	(1,149		)	(1,900		)	(1,149		)	(1,900		)
Net Amounts Presented in the Consolidated Balance Sheets	4,669			3,074			4,765			3,055
Gross amounts not offset(1)	(2,011		)	—			—			(1,448		)
Net Amount	$	2,658		$	3,074		$	4,765		$	1,607

⁽¹⁾ Amounts represent received/posted collateral.

Amount of Gain or Loss Recognized in Income on Derivatives

The following tables indicate the gain or loss recognized in income on derivatives for the periods presented:

	Three Months Ended March 31,
(dollars in thousands)	2018			2017
Derivatives not Designated as Hedging Instruments
Interest rate swap contracts—commercial loans	$	115		$	24
Interest rate lock commitments—mortgage loans	45			233
Forward sale contracts—mortgage loans	(19		)	(36		)
Total Derivatives (Loss)/Gain	$	141		$	221

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Borrowings (Tables)

3 Months Ended

Mar. 31, 2018

Debt Disclosure [Abstract]

Summary of Information Pertaining to Borrowings

Information pertaining to borrowings is summarized in the table below as of the dates presented:

	March 31, 2018				December 31, 2017
(dollars in thousands)	Balance		Weighted Average Rate		Balance		Weighted Average Rate
Short-term Borrowings
Securities sold under repurchase agreements	$	44,617	0.42	%	$	50,161	0.39	%
Short-term borrowings	525,000		1.86	%	540,000		1.47	%
Total Short-term Borrowings	569,617		1.75	%	590,161		1.38	%
Long-term Borrowings
Long-term borrowings	46,684		2.09	%	47,301		1.88	%
Junior subordinated debt securities	45,619		4.58	%	45,619		3.78	%
Total Long-term Borrowings	92,303		3.32	%	92,920		2.81	%
Total Borrowings	$	661,920	1.97	%	$	683,081	1.57	%

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Commitments and Contingencies (Tables)

3 Months Ended

Mar. 31, 2018

Commitments and Contingencies Disclosure [Abstract]

Commitments and Letters of Credit

The following table sets forth our commitments and letters of credit as of the dates presented:

(dollars in thousands)	March 31, 2018		December 31, 2017
Commitments to extend credit	$	1,454,312	$	1,420,428
Standby letters of credit	78,985		80,918
Total	$	1,533,297	$	1,501,346

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Other Comprehensive Income (Tables)

3 Months Ended

Mar. 31, 2018

Equity [Abstract]

Tax Effects of Components of Other Comprehensive Income

The following tables present the change in components of other comprehensive income (loss) for the periods presented, net of tax effects.

	Three Months Ended March 31, 2018									Three months ended March 31, 2017
(dollars in thousands)	Pre-Tax Amount			Tax (Expense) Benefit			Net of Tax Amount			Pre-Tax Amount			Tax (Expense) Benefit			Net of Tax Amount
Change in net unrealized gains/(losses) on debt securities available-for-sale (2)	$	(9,474	)	$	2,012		$	(7,462	)	$	1,662		$	(584	)	$	1,078
Reclassification adjustment for net (gains)/losses on debt securities available-for-sale included in net income (1)	—			—			—			(370		)	130			(240		)
Adjustment to funded status of employee benefit plans	621			(132		)	489			539			(189		)	350
Other Comprehensive Income/(Loss)	$	(8,853	)	$	1,880		$	(6,973	)	$	1,831		$	(643	)	$	1,188
(1) Reclassification adjustments are comprised of realized security gains or losses. The realized gains or losses have been reclassified out of accumulated other comprehensive income/(loss) and have affected certain lines in the Consolidated Statements of Comprehensive Income as follows; the pre-tax amount is included in securities gains/losses-net, the tax expense amount is included in the provision for income taxes and the net of tax amount is included in net income.
(2) Due to the adoption of ASU 2016-01, net unrealized gains on marketable equity securities were reclassified from Accumulated Other Comprehensive Income to Retained Earnings during the three months ended March 31, 2018. The prior period data was not restated; as such, the change in unrealized gains on marketable securities is combined with the change in net unrealized gains on debit securities for the period ended March 31, 2017.

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Employee Benefits (Tables)

3 Months Ended

Mar. 31, 2018

Retirement Benefits [Abstract]

Components of Net Periodic Pension Cost and Other Changes in Plan Assets and Benefit

The following table summarizes the components of net periodic pension cost for the periods presented:

	Three Months Ended March 31,
(dollars in thousands)	2018			2017
Components of Net Periodic Pension Cost
Service cost—benefits earned during the period	$	—		$	—
Interest cost on projected benefit obligation	967			1,025
Expected return on plan assets	(1,567		)	(1,582		)
Amortization of prior service credit	544			474
Recognized net actuarial loss	—			—
Net Periodic Pension Expense	$	(56	)	$	(83	)

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Basis of Presentation (Details) - USD ($) $ in Thousands			3 Months Ended
		Jan. 01, 2018	Mar. 31, 2018	Mar. 31, 2017
Schedule of Equity Method Investments [Line Items]
Gain on sale of a majority interest of insurance business			$ 1,873	$ 0
Unrealized Gains/losses Recognized on Equity Securities Still Held			52	$ 363
Provisional estimate for reclassification of AOCI to retain earnings for other income tax effects of Tax Act			$ 3,700
Accounting Standards Update 2016-01 | AOCI
Schedule of Equity Method Investments [Line Items]
Reclassification of net unrealized gains on equity securities	[1]	$ (862)
Accounting Standards Update 2016-01 | Retained Earnings
Schedule of Equity Method Investments [Line Items]
Reclassification of net unrealized gains on equity securities	[1]	$ 862
New Partnership
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage		30.00%
Subsidiaries | S&T Evergreen Insurance LLC
Schedule of Equity Method Investments [Line Items]
Percentage of ownership in subsidiary sold		70.00%
Gain on sale of a majority interest of insurance business		$ 1,900

[1] Reclassification due to the adoption of ASU No. 2016-01

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Earnings Per Share - Reconciles Numerators and Denominators of Basic Earnings Per Share with Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Numerator for Earnings per Share Basic and Diluted:
Net income	$ 26,163	$ 18,188
Less: Income allocated to participating shares	80	60
Net Income Allocated to Shareholders	26,083	18,128
Net Income Available to Shareholders	$ 26,163	$ 18,188
Denominators for Earnings per Share:
Weighted Average Shares Outstanding—Basic (in shares)	34,756,726	34,690,250
Add: Potentially dilutive shares (in shares)	242,439	222,011
Denominator for Treasury Stock Method—Diluted (in shares)	34,999,165	34,912,261
Weighted Average Shares Outstanding—Basic (in shares)	34,756,726	34,690,250
Add: Average participating shares outstanding (in shares)	106,722	115,395
Denominator for Two-Class Method—Diluted (in shares)	34,863,448	34,805,645
Earnings per share—basic (in dollars per share)	$ 0.75	$ 0.52
Earnings per share—diluted (in dollars per share)	0.75	0.52
Anti-dilutive warrants—exercise price (in dollars per share)	$ 31.53	$ 31.53
Warrants
Denominators for Earnings per Share:
Anti-dilutive excluded from potentially dilutive shares (in shares)	400,722	447,103
Restricted Stock
Denominators for Earnings per Share:
Anti-dilutive excluded from potentially dilutive shares (in shares)	90,298	79,544

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Fair Value Measurement - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($)		Mar. 31, 2018	Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Transfers between Level 1 to Level 2		$ 0	$ 0
ASSETS
Debt securities available-for-sale:		682,454,000	693,147,000
Marketable equity securities		5,196,000	5,144,000
U.S. Treasury securities
ASSETS
Debt securities available-for-sale:		14,661,000	19,789,000
Obligations of U.S. government corporations and agencies
ASSETS
Debt securities available-for-sale:		160,589,000	162,193,000
Collateralized mortgage obligations of U.S. government corporations and agencies
ASSETS
Debt securities available-for-sale:		102,582,000	108,688,000
Residential mortgage-backed securities of U.S. government corporations and agencies
ASSETS
Debt securities available-for-sale:		30,683,000	32,854,000
Commercial mortgage-backed securities of U.S. government corporations and agencies
ASSETS
Debt securities available-for-sale:		248,798,000	242,221,000	[1]
Obligations of states and political subdivisions
ASSETS
Debt securities available-for-sale:		125,141,000	127,402,000
Marketable equity securities
ASSETS
Marketable equity securities	[2]	0	5,144,000
Fair Value Measurements, Recurring
ASSETS
Debt securities available-for-sale:		682,454,000	698,291,000
Marketable equity securities	[3]	5,196,000
Total securities		687,650,000	698,291,000
Trading securities held in a Rabbi Trust		5,048,000	5,080,000
Total Assets		697,638,000	706,671,000
LIABILITIES
Total Liabilities		4,789,000	3,060,000
Fair Value Measurements, Recurring | U.S. Treasury securities
ASSETS
Debt securities available-for-sale:		14,661,000	19,789,000
Fair Value Measurements, Recurring | Obligations of U.S. government corporations and agencies
ASSETS
Debt securities available-for-sale:		160,589,000	162,193,000
Fair Value Measurements, Recurring | Collateralized mortgage obligations of U.S. government corporations and agencies
ASSETS
Debt securities available-for-sale:		102,582,000	108,688,000
Fair Value Measurements, Recurring | Residential mortgage-backed securities of U.S. government corporations and agencies
ASSETS
Debt securities available-for-sale:		30,683,000	32,854,000
Fair Value Measurements, Recurring | Commercial mortgage-backed securities of U.S. government corporations and agencies
ASSETS
Debt securities available-for-sale:		248,798,000	242,221,000
Fair Value Measurements, Recurring | Obligations of states and political subdivisions
ASSETS
Debt securities available-for-sale:		125,141,000	127,402,000
Fair Value Measurements, Recurring | Marketable equity securities
ASSETS
Debt securities available-for-sale:			5,144,000
Fair Value Measurements, Recurring | Interest rate swaps
ASSETS
Derivative financial assets		4,669,000	3,074,000
LIABILITIES
Derivative financial liabilities		4,765,000	3,055,000
Fair Value Measurements, Recurring | Interest rate lock commitments
ASSETS
Derivative financial assets		271,000	226,000
Fair Value Measurements, Recurring | Forward sale contracts
LIABILITIES
Derivative financial liabilities		24,000	5,000
Fair Value Measurements, Recurring | Level 1
ASSETS
Debt securities available-for-sale:		0	0
Marketable equity securities	[3]	0
Total securities		0	0
Trading securities held in a Rabbi Trust		5,048,000	5,080,000
Total Assets		5,048,000	5,080,000
LIABILITIES
Total Liabilities		0	0
Fair Value Measurements, Recurring | Level 1 | U.S. Treasury securities
ASSETS
Debt securities available-for-sale:		0	0
Fair Value Measurements, Recurring | Level 1 | Obligations of U.S. government corporations and agencies
ASSETS
Debt securities available-for-sale:		0	0
Fair Value Measurements, Recurring | Level 1 | Collateralized mortgage obligations of U.S. government corporations and agencies
ASSETS
Debt securities available-for-sale:		0	0
Fair Value Measurements, Recurring | Level 1 | Residential mortgage-backed securities of U.S. government corporations and agencies
ASSETS
Debt securities available-for-sale:		0	0
Fair Value Measurements, Recurring | Level 1 | Commercial mortgage-backed securities of U.S. government corporations and agencies
ASSETS
Debt securities available-for-sale:		0	0
Fair Value Measurements, Recurring | Level 1 | Obligations of states and political subdivisions
ASSETS
Debt securities available-for-sale:		0	0
Fair Value Measurements, Recurring | Level 1 | Marketable equity securities
ASSETS
Debt securities available-for-sale:			0
Fair Value Measurements, Recurring | Level 1 | Interest rate swaps
ASSETS
Derivative financial assets		0	0
LIABILITIES
Derivative financial liabilities		0	0
Fair Value Measurements, Recurring | Level 1 | Interest rate lock commitments
ASSETS
Derivative financial assets		0	0
Fair Value Measurements, Recurring | Level 1 | Forward sale contracts
LIABILITIES
Derivative financial liabilities		0	0
Fair Value Measurements, Recurring | Level 2
ASSETS
Debt securities available-for-sale:		682,454,000	698,291,000
Marketable equity securities	[3]	5,196,000
Total securities		687,650,000	698,291,000
Trading securities held in a Rabbi Trust		0	0
Total Assets		692,590,000	701,591,000
LIABILITIES
Total Liabilities		4,789,000	3,060,000
Fair Value Measurements, Recurring | Level 2 | U.S. Treasury securities
ASSETS
Debt securities available-for-sale:		14,661,000	19,789,000
Fair Value Measurements, Recurring | Level 2 | Obligations of U.S. government corporations and agencies
ASSETS
Debt securities available-for-sale:		160,589,000	162,193,000
Fair Value Measurements, Recurring | Level 2 | Collateralized mortgage obligations of U.S. government corporations and agencies
ASSETS
Debt securities available-for-sale:		102,582,000	108,688,000
Fair Value Measurements, Recurring | Level 2 | Residential mortgage-backed securities of U.S. government corporations and agencies
ASSETS
Debt securities available-for-sale:		30,683,000	32,854,000
Fair Value Measurements, Recurring | Level 2 | Commercial mortgage-backed securities of U.S. government corporations and agencies
ASSETS
Debt securities available-for-sale:		248,798,000	242,221,000
Fair Value Measurements, Recurring | Level 2 | Obligations of states and political subdivisions
ASSETS
Debt securities available-for-sale:		125,141,000	127,402,000
Fair Value Measurements, Recurring | Level 2 | Marketable equity securities
ASSETS
Debt securities available-for-sale:			5,144,000
Fair Value Measurements, Recurring | Level 2 | Interest rate swaps
ASSETS
Derivative financial assets		4,669,000	3,074,000
LIABILITIES
Derivative financial liabilities		4,765,000	3,055,000
Fair Value Measurements, Recurring | Level 2 | Interest rate lock commitments
ASSETS
Derivative financial assets		271,000	226,000
Fair Value Measurements, Recurring | Level 2 | Forward sale contracts
LIABILITIES
Derivative financial liabilities		24,000	5,000
Fair Value Measurements, Recurring | Level 3
ASSETS
Debt securities available-for-sale:		0	0
Marketable equity securities	[3]	0
Total securities		0	0
Trading securities held in a Rabbi Trust		0	0
Total Assets		0	0
LIABILITIES
Total Liabilities		0	0
Fair Value Measurements, Recurring | Level 3 | U.S. Treasury securities
ASSETS
Debt securities available-for-sale:		0	0
Fair Value Measurements, Recurring | Level 3 | Obligations of U.S. government corporations and agencies
ASSETS
Debt securities available-for-sale:		0	0
Fair Value Measurements, Recurring | Level 3 | Collateralized mortgage obligations of U.S. government corporations and agencies
ASSETS
Debt securities available-for-sale:		0	0
Fair Value Measurements, Recurring | Level 3 | Residential mortgage-backed securities of U.S. government corporations and agencies
ASSETS
Debt securities available-for-sale:		0	0
Fair Value Measurements, Recurring | Level 3 | Commercial mortgage-backed securities of U.S. government corporations and agencies
ASSETS
Debt securities available-for-sale:		0	0
Fair Value Measurements, Recurring | Level 3 | Obligations of states and political subdivisions
ASSETS
Debt securities available-for-sale:		0	0
Fair Value Measurements, Recurring | Level 3 | Marketable equity securities
ASSETS
Debt securities available-for-sale:			0
Fair Value Measurements, Recurring | Level 3 | Interest rate swaps
ASSETS
Derivative financial assets		0	0
LIABILITIES
Derivative financial liabilities		0	0
Fair Value Measurements, Recurring | Level 3 | Interest rate lock commitments
ASSETS
Derivative financial assets		0	0
Fair Value Measurements, Recurring | Level 3 | Forward sale contracts
LIABILITIES
Derivative financial liabilities		$ 0	$ 0

[1] Includes a $5.9 million security purchase that was pending settlement as of December 31, 2017.

[2] ASU 2016-01 was adopted January 1, 2018, resulting in separate classification of our marketable equity securities previously included in available-for-sale securities

[3] ASU 2016-01 was adopted January 1, 2018, resulting in separate classification of our marketable equity securities previously included in available-for-sale securities.

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Fair Value Measurement - Assets Measured at Estimated Fair Value on Nonrecurring Basis by Fair Value Hierarchy (Details) - Fair Value, Measurements, Nonrecurring - USD ($)		Mar. 31, 2018	Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liabilities measured at fair value on a nonrecurring basis		$ 0	$ 0
ASSETS
Loans held for sale	[1]	0	0
Impaired loans	[1]	6,551,000	6,759,000
Other real estate owned	[1]	2,880,000	444,000
Mortgage servicing rights	[1]	106,000	178,000
Total Assets	[1]	9,537,000	7,381,000
Level 1
ASSETS
Loans held for sale	[1]	0	0
Impaired loans	[1]	0	0
Other real estate owned	[1]	0	0
Mortgage servicing rights	[1]	0	0
Total Assets	[1]	0	0
Level 2
ASSETS
Loans held for sale	[1]	0	0
Impaired loans	[1]	0	0
Other real estate owned	[1]	0	0
Mortgage servicing rights	[1]	0	0
Total Assets	[1]	0	0
Level 3
ASSETS
Loans held for sale	[1]	0	0
Impaired loans	[1]	6,551,000	6,759,000
Other real estate owned	[1]	2,880,000	444,000
Mortgage servicing rights	[1]	106,000	178,000
Total Assets	[1]	$ 9,537,000	$ 7,381,000

[1] This table represents only the nonrecurring items that are recorded at fair value in our financial statements.

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Fair Value Measurement - Carrying Values and Fair Values of Financial Instruments (Details) - USD ($) $ in Thousands		Mar. 31, 2018	Dec. 31, 2017
ASSETS
Securities, at fair value		$ 687,650	$ 698,291
Portfolio loans, net		5,730,613	5,761,449
FHLB and other restricted stock		29,769	29,270
Carrying Value
ASSETS
Cash and due from banks, including interest-bearing deposits	[1]	112,849	117,152
Securities, at fair value	[1]	687,650	698,291
Loans held for sale	[1]	3,283	4,485
Portfolio loans, net	[1]	5,671,567	5,705,059
Bank owned life insurance	[1]	72,629	72,150
FHLB and other restricted stock	[1]	29,769	29,270
Trading securities held in a Rabbi Trust	[1]	5,048	5,080
Mortgage servicing rights	[1]	4,182	4,133
LIABILITIES
Deposits	[1]	5,387,094	5,427,891
Securities sold under repurchase agreements	[1]	44,617	50,161
Short-term borrowings	[1]	525,000	540,000
Long-term borrowings	[1]	46,684	47,301
Junior subordinated debt securities	[1]	45,619	45,619
Carrying Value | Interest rate swaps
ASSETS
Derivative financial assets	[1]	4,669	3,074
LIABILITIES
Derivative financial liabilities	[1]	4,765	3,055
Carrying Value | Interest rate lock commitments
ASSETS
Derivative financial assets	[1]	271	226
Carrying Value | Forward sale contracts
LIABILITIES
Derivative financial liabilities	[1]	24	5
Fair Value Measurements
ASSETS
Cash and due from banks, including interest-bearing deposits		112,849	117,152
Securities, at fair value		687,650	698,291
Loans held for sale		3,377	4,583
Portfolio loans, net		5,530,443	5,690,292
Bank owned life insurance		72,629	72,150
FHLB and other restricted stock		29,769	29,270
Trading securities held in a Rabbi Trust		5,048	5,080
Mortgage servicing rights		5,023	4,571
LIABILITIES
Deposits		5,372,506	5,426,928
Securities sold under repurchase agreements		44,617	50,161
Short-term borrowings		525,000	540,000
Long-term borrowings		46,892	47,618
Junior subordinated debt securities		45,619	45,619
Fair Value Measurements | Interest rate swaps
ASSETS
Derivative financial assets		4,669	3,074
LIABILITIES
Derivative financial liabilities		4,765	3,055
Fair Value Measurements | Interest rate lock commitments
ASSETS
Derivative financial assets		271	226
Fair Value Measurements | Forward sale contracts
LIABILITIES
Derivative financial liabilities		24	5
Fair Value Measurements | Level 1
ASSETS
Cash and due from banks, including interest-bearing deposits		112,849	117,152
Securities, at fair value		0	0
Loans held for sale		0	0
Portfolio loans, net		0	0
Bank owned life insurance		0	0
FHLB and other restricted stock		0	0
Trading securities held in a Rabbi Trust		5,048	5,080
Mortgage servicing rights		0	0
LIABILITIES
Deposits		0	0
Securities sold under repurchase agreements		0	0
Short-term borrowings		0	0
Long-term borrowings		0	0
Junior subordinated debt securities		0	0
Fair Value Measurements | Level 1 | Interest rate swaps
ASSETS
Derivative financial assets		0	0
LIABILITIES
Derivative financial liabilities		0	0
Fair Value Measurements | Level 1 | Interest rate lock commitments
ASSETS
Derivative financial assets		0	0
Fair Value Measurements | Level 1 | Forward sale contracts
LIABILITIES
Derivative financial liabilities		0	0
Fair Value Measurements | Level 2
ASSETS
Cash and due from banks, including interest-bearing deposits		0	0
Securities, at fair value		687,650	698,291
Loans held for sale		0	0
Portfolio loans, net		0	0
Bank owned life insurance		72,629	72,150
FHLB and other restricted stock		0	0
Trading securities held in a Rabbi Trust		0	0
Mortgage servicing rights		0	0
LIABILITIES
Deposits		0	0
Securities sold under repurchase agreements		0	0
Short-term borrowings		0	0
Long-term borrowings		0	0
Junior subordinated debt securities		0	0
Fair Value Measurements | Level 2 | Interest rate swaps
ASSETS
Derivative financial assets		4,669	3,074
LIABILITIES
Derivative financial liabilities		4,765	3,055
Fair Value Measurements | Level 2 | Interest rate lock commitments
ASSETS
Derivative financial assets		271	226
Fair Value Measurements | Level 2 | Forward sale contracts
LIABILITIES
Derivative financial liabilities		24	5
Fair Value Measurements | Level 3
ASSETS
Cash and due from banks, including interest-bearing deposits		0	0
Securities, at fair value		0	0
Loans held for sale		3,377	4,583
Portfolio loans, net		5,530,443	5,690,292
Bank owned life insurance		0	0
FHLB and other restricted stock		29,769	29,270
Trading securities held in a Rabbi Trust		0	0
Mortgage servicing rights		5,023	4,571
LIABILITIES
Deposits		5,372,506	5,426,928
Securities sold under repurchase agreements		44,617	50,161
Short-term borrowings		525,000	540,000
Long-term borrowings		46,892	47,618
Junior subordinated debt securities		45,619	45,619
Fair Value Measurements | Level 3 | Interest rate swaps
ASSETS
Derivative financial assets		0	0
LIABILITIES
Derivative financial liabilities		0	0
Fair Value Measurements | Level 3 | Interest rate lock commitments
ASSETS
Derivative financial assets		0	0
Fair Value Measurements | Level 3 | Forward sale contracts
LIABILITIES
Derivative financial liabilities		$ 0	$ 0

[1] As reported in the Consolidated Balance Sheets.

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Securities - Fair Values and Amortized Costs Securities (Details) - USD ($) $ in Thousands		Mar. 31, 2018	Dec. 31, 2017
Schedule of Available-for-sale Securities [Line Items]
Debt Securities, Amortized Cost		$ 690,251
Debt Securities, Gross Unrealized Gains		3,070	$ 5,645
Debt Securities, Gross Unrealized Losses		(10,867)	(3,967)
Debt Securities, Fair Value		682,454	693,147
Equity Securities, Fair Value		5,196	5,144
Total Securities, Amortized Cost			695,284
Total Securities, Gross Unrealized Gains			6,975
Total Securities, Gross Unrealized Losses			(3,968)
Total Securities, Fair Value		687,650	698,291
U.S. Treasury securities
Schedule of Available-for-sale Securities [Line Items]
Debt Securities, Amortized Cost		14,951	19,943
Debt Securities, Gross Unrealized Gains		0	0
Debt Securities, Gross Unrealized Losses		(290)	(154)
Debt Securities, Fair Value		14,661	19,789
Obligations of U.S. government corporations and agencies
Schedule of Available-for-sale Securities [Line Items]
Debt Securities, Amortized Cost		161,844	162,045
Debt Securities, Gross Unrealized Gains		62	341
Debt Securities, Gross Unrealized Losses		(1,317)	(193)
Debt Securities, Fair Value		160,589	162,193
Collateralized mortgage obligations of U.S. government corporations and agencies
Schedule of Available-for-sale Securities [Line Items]
Debt Securities, Amortized Cost		105,063	109,916
Debt Securities, Gross Unrealized Gains		2	93
Debt Securities, Gross Unrealized Losses		(2,483)	(1,321)
Debt Securities, Fair Value		102,582	108,688
Residential mortgage-backed securities of U.S. government corporations and agencies
Schedule of Available-for-sale Securities [Line Items]
Debt Securities, Amortized Cost		30,700	32,388
Debt Securities, Gross Unrealized Gains		443	679
Debt Securities, Gross Unrealized Losses		(460)	(213)
Debt Securities, Fair Value		30,683	32,854
Commercial mortgage-backed securities of U.S. government corporations and agencies
Schedule of Available-for-sale Securities [Line Items]
Debt Securities, Amortized Cost		255,043	244,018	[1]
Debt Securities, Gross Unrealized Gains		0	247	[1]
Debt Securities, Gross Unrealized Losses		(6,245)	(2,044)	[1]
Debt Securities, Fair Value		248,798	242,221	[1]
Securities purchased pending settlement			5,900
Obligations of states and political subdivisions
Schedule of Available-for-sale Securities [Line Items]
Debt Securities, Amortized Cost		122,650	123,159
Debt Securities, Gross Unrealized Gains		2,563	4,285
Debt Securities, Gross Unrealized Losses		(72)	(42)
Debt Securities, Fair Value		125,141	127,402
Total Debt Securities Available-for-Sale
Schedule of Available-for-sale Securities [Line Items]
Debt Securities, Amortized Cost		690,251	691,469
Debt Securities, Gross Unrealized Gains		3,070	5,645
Debt Securities, Gross Unrealized Losses		(10,867)	(3,967)
Debt Securities, Fair Value		682,454	693,147
Total equity securities
Schedule of Available-for-sale Securities [Line Items]
Equity Securities, FV-NI, Cost	[2]	0	3,815
Equity Securities, FV-NI, Unrealized Gain	[2]	0	1,330
Equity Securities, FV-NI, Unrealized Loss	[2]	0	(1)
Equity Securities, Fair Value	[2]	$ 0	$ 5,144

[1] Includes a $5.9 million security purchase that was pending settlement as of December 31, 2017.

[2] ASU 2016-01 was adopted January 1, 2018, resulting in separate classification of our marketable equity securities previously included in available-for-sale securities

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Securities - Fair Value and Age of Gross Unrealized Losses of Debt Securities (Details) $ in Thousands	Mar. 31, 2018 USD ($) security	Dec. 31, 2017 USD ($) security
Schedule of Available-for-sale Securities [Line Items]
Temporarily Impaired Debt Securities, Less Than 12 Months, Number of Securities | security	56	36
Temporarily Impaired Debt Securities, Less Than 12 Months, Fair Value	$ 430,791	$ 271,852
Temporarily Impaired Debt Securities, Less Than 12 Months, Unrealized Losses	$ (6,712)	$ (1,373)
Temporarily Impaired Debt Securities, 12 Months or More, Number of Securities | security	15	15
Temporarily Impaired Debt Securities, 12 Months or More, Fair Value	$ 108,907	$ 113,210
Temporarily Impaired Debt Securities, 12 Months or More, Unrealized Losses	$ (4,155)	$ (2,594)
Temporarily Impaired Debt Securities, Number of Securities | security	71	51
Temporarily Impaired Debt Securities, Fair Value, Total	$ 539,698	$ 385,062
Temporarily Impaired Debt Securities, Continuous Unrealized Loss Position, Accumulated Loss	$ (10,867)	$ (3,967)
U.S. Treasury securities
Schedule of Available-for-sale Securities [Line Items]
Temporarily Impaired Debt Securities, Less Than 12 Months, Number of Securities | security	2	3
Temporarily Impaired Debt Securities, Less Than 12 Months, Fair Value	$ 14,661	$ 19,789
Temporarily Impaired Debt Securities, Less Than 12 Months, Unrealized Losses	$ (290)	$ (154)
Temporarily Impaired Debt Securities, 12 Months or More, Number of Securities | security	0	0
Temporarily Impaired Debt Securities, 12 Months or More, Fair Value	$ 0	$ 0
Temporarily Impaired Debt Securities, 12 Months or More, Unrealized Losses	$ 0	$ 0
Temporarily Impaired Debt Securities, Number of Securities | security	2	3
Temporarily Impaired Debt Securities, Fair Value, Total	$ 14,661	$ 19,789
Temporarily Impaired Debt Securities, Continuous Unrealized Loss Position, Accumulated Loss	$ (290)	$ (154)
Obligations of U.S. government corporations and agencies
Schedule of Available-for-sale Securities [Line Items]
Temporarily Impaired Debt Securities, Less Than 12 Months, Number of Securities | security	16	9
Temporarily Impaired Debt Securities, Less Than 12 Months, Fair Value	$ 130,823	$ 63,635
Temporarily Impaired Debt Securities, Less Than 12 Months, Unrealized Losses	$ (1,274)	$ (144)
Temporarily Impaired Debt Securities, 12 Months or More, Number of Securities | security	1	1
Temporarily Impaired Debt Securities, 12 Months or More, Fair Value	$ 10,000	$ 10,017
Temporarily Impaired Debt Securities, 12 Months or More, Unrealized Losses	$ (43)	$ (49)
Temporarily Impaired Debt Securities, Number of Securities | security	17	10
Temporarily Impaired Debt Securities, Fair Value, Total	$ 140,823	$ 73,652
Temporarily Impaired Debt Securities, Continuous Unrealized Loss Position, Accumulated Loss	$ (1,317)	$ (193)
Collateralized mortgage obligations of U.S. government corporations and agencies
Schedule of Available-for-sale Securities [Line Items]
Temporarily Impaired Debt Securities, Less Than 12 Months, Number of Securities | security	8	7
Temporarily Impaired Debt Securities, Less Than 12 Months, Fair Value	$ 55,695	$ 47,465
Temporarily Impaired Debt Securities, Less Than 12 Months, Unrealized Losses	$ (800)	$ (248)
Temporarily Impaired Debt Securities, 12 Months or More, Number of Securities | security	7	7
Temporarily Impaired Debt Securities, 12 Months or More, Fair Value	$ 43,184	$ 45,809
Temporarily Impaired Debt Securities, 12 Months or More, Unrealized Losses	$ (1,683)	$ (1,073)
Temporarily Impaired Debt Securities, Number of Securities | security	15	14
Temporarily Impaired Debt Securities, Fair Value, Total	$ 98,879	$ 93,274
Temporarily Impaired Debt Securities, Continuous Unrealized Loss Position, Accumulated Loss	$ (2,483)	$ (1,321)
Residential mortgage-backed securities of U.S. government corporations and agencies
Schedule of Available-for-sale Securities [Line Items]
Temporarily Impaired Debt Securities, Less Than 12 Months, Number of Securities | security	3	1
Temporarily Impaired Debt Securities, Less Than 12 Months, Fair Value	$ 4,861	$ 2,333
Temporarily Impaired Debt Securities, Less Than 12 Months, Unrealized Losses	$ (106)	$ (10)
Temporarily Impaired Debt Securities, 12 Months or More, Number of Securities | security	2	2
Temporarily Impaired Debt Securities, 12 Months or More, Fair Value	$ 7,976	$ 8,638
Temporarily Impaired Debt Securities, 12 Months or More, Unrealized Losses	$ (354)	$ (203)
Temporarily Impaired Debt Securities, Number of Securities | security	5	3
Temporarily Impaired Debt Securities, Fair Value, Total	$ 12,837	$ 10,971
Temporarily Impaired Debt Securities, Continuous Unrealized Loss Position, Accumulated Loss	$ (460)	$ (213)
Commercial mortgage-backed securities of U.S. government corporations and agencies
Schedule of Available-for-sale Securities [Line Items]
Temporarily Impaired Debt Securities, Less Than 12 Months, Number of Securities | security	22	14
Temporarily Impaired Debt Securities, Less Than 12 Months, Fair Value	$ 201,051	$ 128,300
Temporarily Impaired Debt Securities, Less Than 12 Months, Unrealized Losses	$ (4,170)	$ (775)
Temporarily Impaired Debt Securities, 12 Months or More, Number of Securities | security	5	5
Temporarily Impaired Debt Securities, 12 Months or More, Fair Value	$ 47,747	$ 48,746
Temporarily Impaired Debt Securities, 12 Months or More, Unrealized Losses	$ (2,075)	$ (1,269)
Temporarily Impaired Debt Securities, Number of Securities | security	27	19
Temporarily Impaired Debt Securities, Fair Value, Total	$ 248,798	$ 177,046
Temporarily Impaired Debt Securities, Continuous Unrealized Loss Position, Accumulated Loss	$ (6,245)	$ (2,044)
Obligations of states and political subdivisions
Schedule of Available-for-sale Securities [Line Items]
Temporarily Impaired Debt Securities, Less Than 12 Months, Number of Securities | security	5	2
Temporarily Impaired Debt Securities, Less Than 12 Months, Fair Value	$ 23,700	$ 10,330
Temporarily Impaired Debt Securities, Less Than 12 Months, Unrealized Losses	$ (72)	$ (42)
Temporarily Impaired Debt Securities, 12 Months or More, Number of Securities | security	0	0
Temporarily Impaired Debt Securities, 12 Months or More, Fair Value	$ 0	$ 0
Temporarily Impaired Debt Securities, 12 Months or More, Unrealized Losses	$ 0	$ 0
Temporarily Impaired Debt Securities, Number of Securities | security	5	2
Temporarily Impaired Debt Securities, Fair Value, Total	$ 23,700	$ 10,330
Temporarily Impaired Debt Securities, Continuous Unrealized Loss Position, Accumulated Loss	$ (72)	$ (42)

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Securities - Additional Information (Details) $ in Thousands		Mar. 31, 2018 USD ($) security	Jan. 01, 2018 USD ($)	Dec. 31, 2017 USD ($) security
Schedule of Available-for-sale Securities [Line Items]
Number of debt securities in unrealized loss position | security		71		51
Securities pledged for regulatory and legal requirements		$ 221,000		$ 249,000
Accounting Standards Update 2016-01 | AOCI
Schedule of Available-for-sale Securities [Line Items]
Net unrealized gains and losses, net of tax, reclassified from AOCI to retained earnings on marketable equity securities	[1]		$ (862)
Accounting Standards Update 2016-01 | Retained Earnings
Schedule of Available-for-sale Securities [Line Items]
Net unrealized gains and losses, net of tax, reclassified from AOCI to retained earnings on marketable equity securities	[1]		$ 862

[1] Reclassification due to the adoption of ASU No. 2016-01

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Securities - Unrealized Gains (Losses) of Debt Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Investments, Debt and Equity Securities [Abstract]
Total unrealized gains (losses) on debt securities available-for-sale, Gross Unrealized Losses	$ 3,070	$ 5,645
Total unrealized gains (losses) on debt securities available-for-sale, Gross Unrealized Losses	(10,867)	(3,967)
Total unrealized gains (losses) on debt securities available-for-sale, Net Unrealized Gains/(Losses)	(7,797)	1,678
Accumulated Other Comprehensive Income (Loss), Debt Securities Available For Sale Gross Unrealized Gain Adjustment, Tax Expense (Benefit)	(652)	(1,982)
Accumulated Other Comprehensive Income (Loss), Debt Securities Available For Sale Gross Unrealized Loss Adjustment, Tax Expense (Benefit)	2,308	1,393
Accumulated Other Comprehensive Income (Loss), Debt Securities Available-for-sale Adjustment, Tax Expense (Benefit)	1,656	(589)
Accumulated Other Comprehensive Income (Loss), Debt Securities Available For Sale Gross Unrealized Gain Adjustment Net Of Tax	2,418	3,663
Accumulated Other Comprehensive Income (Loss), Debt Securities Available For Sale Gross Unrealized Losses Adjustment Net Of Tax	(8,559)	(2,574)
Accumulated Other Comprehensive Income (Loss), Debt Securities Available-for-sale Securities Adjustment, Net of Tax	$ (6,141)	$ 1,089

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Securities - Contractual Maturities of Debt Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Schedule of Available-for-sale Securities [Line Items]
Debt Securities, Amortized Cost	$ 690,251
Debt Securities, Fair Value	682,454	$ 693,147
Obligations of the U.S. Treasury, U.S. government corporations and agencies, and obligations of states and political subdivisions
Schedule of Available-for-sale Securities [Line Items]
Due in one year or less, Amortized Cost	43,472
Due after one year through five years, Amortized Cost	148,616
Due after five years through ten years, Amortized Cost	78,565
Due after ten years, Amortized Cost	28,792
Debt Securities, Amortized Cost	299,445
Due in one year or less, Fair Value	43,372
Due after one year through five years, Fair Value	148,787
Due after five years through ten years, Fair Value	78,767
Due after ten years, Fair Value	29,465
Debt Securities, Fair Value	300,391
Collateralized mortgage obligations of U.S. government corporations and agencies
Schedule of Available-for-sale Securities [Line Items]
Debt Securities, Amortized Cost	105,063	109,916
Debt Securities, Fair Value	102,582	108,688
Residential mortgage-backed securities of U.S. government corporations and agencies
Schedule of Available-for-sale Securities [Line Items]
Debt Securities, Amortized Cost	30,700	32,388
Debt Securities, Fair Value	30,683	32,854
Commercial mortgage-backed securities of U.S. government corporations and agencies
Schedule of Available-for-sale Securities [Line Items]
Debt Securities, Amortized Cost	255,043	244,018	[1]
Debt Securities, Fair Value	$ 248,798	$ 242,221	[1]

[1] Includes a $5.9 million security purchase that was pending settlement as of December 31, 2017.

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Securities - Unrealized Gains (Losses) on Marketable Securities (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Investments, Debt and Equity Securities [Abstract]
Net gains/losses recognized during the period	$ 52	$ 733
Less: Net gains/losses recognized for equity securities sold during the period	0	370
Unrealized Gains/losses Recognized on Equity Securities Still Held	$ 52	$ 363

XML

Loans and Loans Held for Sale - Additional Information (Details)	3 Months Ended		12 Months Ended
	Mar. 31, 2018 USD ($) loan tdr	Mar. 31, 2017 loan tdr	Dec. 31, 2017 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	$ 5,100,000		$ 5,200,000
Threshold period of satisfactory performance for troubled debt restructuring to be restored to accruing status	6 months
Number of troubled debt restructuring loans returned back to accruing status | tdr	0	0
Commitment to lend additional funds on troubled debt restructuring	$ 0
Minimum period of loan payment defaults following restructure for TDRs to be in default	90 days
Number of defaulted troubled debt restructuring loans restructured within twelve months prior to defaulting | loan	0	0
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of commercial loans in total portfolio loans	78.00%		78.00%
Commercial loans	$ 4,491,982,000		$ 4,503,594,000
Commercial real estate | Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loans	2,760,891,000		2,685,994,000
Commercial and industrial | Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loans	1,406,950,000		1,433,266,000
Commercial construction | Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loans	324,141,000		384,334,000
Commercial real estate and commercial construction | Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loans	$ 3,100,000,000		$ 3,100,000,000
Combined percentage of commercial real estate and commercial construction in total commercial loans	69.00%		68.00%
Combined percentage of commercial real estate and commercial construction in total portfolio loans	54.00%		53.00%
Concentration risk percentage of commercial real estate and commercial construction	0.00%		0.00%
Maximum concentration of commercial real estate and commercial construction portfolio in loans (in excess of)	13.00%		14.00%
Out of market exposure of combined portfolio (percent)	5.00%		5.20%
Percentage of total loans out-of-state excluding contiguous states	2.70%		2.80%

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Loans and Loans Held for Sale - Composition of Loans (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Composition of the loans
Portfolio loans, net of unearned income	$ 5,730,613	$ 5,761,449
Loans held for sale	3,283	4,485
Total Loans	5,733,896	5,765,934
Commercial real estate
Composition of the loans
Portfolio loans, net of unearned income	2,760,891	2,685,994
Total Loans	2,760,891	2,685,994
Commercial and industrial
Composition of the loans
Portfolio loans, net of unearned income	1,406,950	1,433,266
Total Loans	1,406,950	1,433,266
Commercial construction
Composition of the loans
Portfolio loans, net of unearned income	324,141	384,334
Total Loans	324,141	384,334
Residential mortgage
Composition of the loans
Total Loans	692,385	698,774
Home equity
Composition of the loans
Total Loans	474,850	487,326
Consumer construction
Composition of the loans
Total Loans	4,506	4,551
Commercial
Composition of the loans
Portfolio loans, net of unearned income	4,491,982	4,503,594
Commercial | Commercial real estate
Composition of the loans
Portfolio loans, net of unearned income		2,685,994
Commercial | Commercial and industrial
Composition of the loans
Portfolio loans, net of unearned income		1,433,266
Commercial | Commercial construction
Composition of the loans
Portfolio loans, net of unearned income		384,334
Consumer
Composition of the loans
Portfolio loans, net of unearned income	1,238,631	1,257,855
Consumer | Residential mortgage
Composition of the loans
Portfolio loans, net of unearned income	692,385	698,774
Consumer | Home equity
Composition of the loans
Portfolio loans, net of unearned income	474,850	487,326
Consumer | Installment and other consumer
Composition of the loans
Portfolio loans, net of unearned income		67,204
Consumer | Consumer construction
Composition of the loans
Portfolio loans, net of unearned income	$ 4,506	$ 4,551

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Loans and Loans Held for Sale - Summary of Restructured Loans (Details) - USD ($) $ in Thousands		3 Months Ended		12 Months Ended
		Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Financing Receivable, Modifications [Line Items]
Restructured loans	[1]	$ 6,770	$ 438
Commercial and industrial
Financing Receivable, Modifications [Line Items]
Restructured loans	[1]	6,041	0
Commercial construction
Financing Receivable, Modifications [Line Items]
Restructured loans	[1]	157	0
Home equity
Financing Receivable, Modifications [Line Items]
Restructured loans	[1]	555	438
Installment and other consumer
Financing Receivable, Modifications [Line Items]
Restructured loans		17	$ 0
Performing TDRs
Financing Receivable, Modifications [Line Items]
Restructured loans		20,035		$ 14,901
Performing TDRs | Commercial real estate
Financing Receivable, Modifications [Line Items]
Restructured loans		2,298		2,579
Performing TDRs | Commercial and industrial
Financing Receivable, Modifications [Line Items]
Restructured loans		9,403		3,946
Performing TDRs | Commercial construction
Financing Receivable, Modifications [Line Items]
Restructured loans		2,400		2,420
Performing TDRs | Residential mortgage
Financing Receivable, Modifications [Line Items]
Restructured loans		2,178		2,039
Performing TDRs | Home equity
Financing Receivable, Modifications [Line Items]
Restructured loans		3,713		3,885
Performing TDRs | Installment and other consumer
Financing Receivable, Modifications [Line Items]
Restructured loans		43		32
Nonperforming TDRs
Financing Receivable, Modifications [Line Items]
Restructured loans		8,560		11,150
Nonperforming TDRs | Commercial real estate
Financing Receivable, Modifications [Line Items]
Restructured loans		944		967
Nonperforming TDRs | Commercial and industrial
Financing Receivable, Modifications [Line Items]
Restructured loans		3,036		3,197
Nonperforming TDRs | Commercial construction
Financing Receivable, Modifications [Line Items]
Restructured loans		414		2,413
Nonperforming TDRs | Residential mortgage
Financing Receivable, Modifications [Line Items]
Restructured loans		2,640		3,585
Nonperforming TDRs | Home equity
Financing Receivable, Modifications [Line Items]
Restructured loans		1,520		979
Nonperforming TDRs | Installment and other consumer
Financing Receivable, Modifications [Line Items]
Restructured loans		6		9
Total TDRs
Financing Receivable, Modifications [Line Items]
Restructured loans		28,595		26,051
Total TDRs | Commercial real estate
Financing Receivable, Modifications [Line Items]
Restructured loans		3,242		3,546
Total TDRs | Commercial and industrial
Financing Receivable, Modifications [Line Items]
Restructured loans		12,439		7,143
Total TDRs | Commercial construction
Financing Receivable, Modifications [Line Items]
Restructured loans		2,814		4,833
Total TDRs | Residential mortgage
Financing Receivable, Modifications [Line Items]
Restructured loans		4,818		5,624
Total TDRs | Home equity
Financing Receivable, Modifications [Line Items]
Restructured loans		5,233		4,864
Total TDRs | Installment and other consumer
Financing Receivable, Modifications [Line Items]
Restructured loans		$ 49		$ 41

[1] Excludes loans that were fully paid off or fully charged-off by period end. The pre-modification balance represents the balance outstanding prior to modification. The post-modification balance represents the outstanding balance at period end.

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Loans and Loans Held for Sale - Restructured Loans By Segment and Type of Concession (Details) $ in Thousands		3 Months Ended
		Mar. 31, 2018 USD ($) loan	Mar. 31, 2017 USD ($) loan
Financing Receivable, Modifications [Line Items]
Number of Loans | loan		21	7
Pre-Modification Outstanding Recorded Investment	[1]	$ 6,876	$ 442
Post-Modification Outstanding Recorded Investment	[1]	6,770	438
Total Difference in Recorded Investment		$ (106)	$ (4)
Maturity date extension
Financing Receivable, Modifications [Line Items]
Number of Loans | loan		2	0
Pre-Modification Outstanding Recorded Investment	[1]	$ 768	$ 0
Post-Modification Outstanding Recorded Investment	[1]	708	0
Total Difference in Recorded Investment		$ (60)	$ 0
Principal deferral
Financing Receivable, Modifications [Line Items]
Number of Loans | loan		6	0
Pre-Modification Outstanding Recorded Investment	[1]	$ 5,355	$ 0
Post-Modification Outstanding Recorded Investment	[1]	5,333	0
Total Difference in Recorded Investment		$ (22)	$ 0
Chapter 7 bankruptcy
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	[2]	13	6
Pre-Modification Outstanding Recorded Investment	[1],[2]	$ 753	$ 269
Post-Modification Outstanding Recorded Investment	[1],[2]	729	266
Total Difference in Recorded Investment	[2]	$ (24)	$ (3)
Maturity date extension and interest rate reduction
Financing Receivable, Modifications [Line Items]
Number of Loans | loan		0	1
Pre-Modification Outstanding Recorded Investment	[1]	$ 0	$ 173
Post-Modification Outstanding Recorded Investment	[1]	0	172
Total Difference in Recorded Investment		$ 0	$ (1)
Commercial and industrial
Financing Receivable, Modifications [Line Items]
Number of Loans | loan		8	0
Pre-Modification Outstanding Recorded Investment	[1]	$ 6,123	$ 0
Post-Modification Outstanding Recorded Investment	[1]	6,041	0
Total Difference in Recorded Investment		$ (82)	$ 0
Commercial and industrial | Maturity date extension
Financing Receivable, Modifications [Line Items]
Number of Loans | loan		2	0
Pre-Modification Outstanding Recorded Investment	[1]	$ 768	$ 0
Post-Modification Outstanding Recorded Investment	[1]	708	0
Total Difference in Recorded Investment		$ (60)	$ 0
Commercial and industrial | Principal deferral
Financing Receivable, Modifications [Line Items]
Number of Loans | loan		6	0
Pre-Modification Outstanding Recorded Investment	[1]	$ 5,355	$ 0
Post-Modification Outstanding Recorded Investment	[1]	5,333	0
Total Difference in Recorded Investment		$ (22)	$ 0
Commercial construction
Financing Receivable, Modifications [Line Items]
Number of Loans | loan		2	0
Pre-Modification Outstanding Recorded Investment	[1]	$ 158	$ 0
Post-Modification Outstanding Recorded Investment	[1]	157	0
Total Difference in Recorded Investment		$ (1)	$ 0
Commercial construction | Chapter 7 bankruptcy
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	[2]	2	0
Pre-Modification Outstanding Recorded Investment	[2]	$ 158	$ 0
Post-Modification Outstanding Recorded Investment	[2]	157	0	[1]
Total Difference in Recorded Investment	[2]	$ (1)	$ 0
Home equity
Financing Receivable, Modifications [Line Items]
Number of Loans | loan		9	7
Pre-Modification Outstanding Recorded Investment	[1]	$ 578	$ 442
Post-Modification Outstanding Recorded Investment	[1]	555	438
Total Difference in Recorded Investment		$ (23)	$ (4)
Home equity | Chapter 7 bankruptcy
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	[2]	9	6
Pre-Modification Outstanding Recorded Investment	[1],[2]	$ 578	$ 269
Post-Modification Outstanding Recorded Investment	[1],[2]	555	266
Total Difference in Recorded Investment	[2]	$ (23)	$ (3)
Home equity | Maturity date extension and interest rate reduction
Financing Receivable, Modifications [Line Items]
Number of Loans | loan		0	1
Pre-Modification Outstanding Recorded Investment	[1]	$ 0	$ 173
Post-Modification Outstanding Recorded Investment	[1]	0	172
Total Difference in Recorded Investment		$ 0	$ (1)
Installment and other consumer
Financing Receivable, Modifications [Line Items]
Number of Loans | loan		2	0
Pre-Modification Outstanding Recorded Investment	[1]	$ 17	$ 0
Post-Modification Outstanding Recorded Investment		17	0
Total Difference in Recorded Investment		$ 0	$ 0
Installment and other consumer | Chapter 7 bankruptcy
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	[2]	2	0
Pre-Modification Outstanding Recorded Investment	[1],[2]	$ 17	$ 0
Post-Modification Outstanding Recorded Investment	[2]	17	0
Total Difference in Recorded Investment	[2]	$ 0	$ 0

[1] Excludes loans that were fully paid off or fully charged-off by period end. The pre-modification balance represents the balance outstanding prior to modification. The post-modification balance represents the outstanding balance at period end.

[2] Chapter 7 bankruptcy loans where the debt has been legally discharged through the bankruptcy court and not reaffirmed.

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Loans and Loans Held for Sale - Nonperforming Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Nonperforming Assets
Nonaccrual loans	$ 12,775	$ 12,788
Nonaccrual TDRs	8,560	11,150
Total Nonaccrual Loans	21,335	23,938
OREO	2,920	469
Total Nonperforming Assets	$ 24,255	$ 24,407

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Allowance for Loan Losses - Age Analysis of Past Due Loans Segregated by Class of Loans (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	$ 5,703,584	$ 5,730,074
Non - performing	21,335	23,938
Past due	30,312	35,860
Total Loans	5,733,896	5,765,934
Commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	2,755,336	2,681,395
Non - performing	3,952	3,468
Past due	5,555	4,599
Total Loans	2,760,891	2,685,994
Commercial and industrial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	1,401,154	1,426,754
Non - performing	4,617	5,646
Past due	5,796	6,512
Total Loans	1,406,950	1,433,266
Commercial construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	321,900	377,968
Non - performing	1,873	3,873
Past due	2,241	6,366
Total Loans	324,141	384,334
Residential mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	682,092	687,195
Non - performing	6,715	7,165
Past due	10,293	11,579
Total Loans	692,385	698,774
Home equity
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	468,762	480,956
Non - performing	4,109	3,715
Past due	6,088	6,370
Total Loans	474,850	487,326
Installment and Other Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	66,551	66,770
Non - performing	69	71
Past due	339	434
Total Loans	66,890	67,204
Consumer construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	4,506	4,551
Non - performing	0	0
Past due	0	0
Total Loans	4,506	4,551
Loans Held for Sale
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	3,283	4,485
Non - performing	0	0
Past due	0	0
Total Loans	3,283	4,485
30 to 59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	7,506	9,123
30 to 59 Days Past Due | Commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	1,162	997
30 to 59 Days Past Due | Commercial and industrial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	1,059	420
30 to 59 Days Past Due | Commercial construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	368	2,473
30 to 59 Days Past Due | Residential mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	3,125	2,975
30 to 59 Days Past Due | Home equity
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	1,603	2,065
30 to 59 Days Past Due | Installment and Other Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	189	193
30 to 59 Days Past Due | Consumer construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	0	0
30 to 59 Days Past Due | Loans Held for Sale
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	0	0
60 to 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	1,471	2,799
60 to 89 Days Past Due | Commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	441	134
60 to 89 Days Past Due | Commercial and industrial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	120	446
60 to 89 Days Past Due | Commercial construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	0	20
60 to 89 Days Past Due | Residential mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	453	1,439
60 to 89 Days Past Due | Home equity
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	376	590
60 to 89 Days Past Due | Installment and Other Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	81	170
60 to 89 Days Past Due | Consumer construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	0	0
60 to 89 Days Past Due | Loans Held for Sale
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	$ 0	$ 0

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Allowance for Loan Losses - Recorded Investment in Commercial Loan Classes by Internally Assigned Risk Ratings (Details) - Commercial - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Financing Receivable, Recorded Investment [Line Items]
Loans and leases receivables, recorded investment	$ 4,491,982	$ 4,503,594
Total percentage of recorded investment in commercial loan	100.00%	100.00%
Pass
Financing Receivable, Recorded Investment [Line Items]
Loans and leases receivables, recorded investment	$ 4,223,695	$ 4,302,762
Total percentage of recorded investment in commercial loan	94.00%	95.50%
Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans and leases receivables, recorded investment	$ 148,680	$ 130,101
Total percentage of recorded investment in commercial loan	3.30%	2.90%
Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans and leases receivables, recorded investment	$ 119,607	$ 70,731
Total percentage of recorded investment in commercial loan	2.70%	1.60%
Commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Loans and leases receivables, recorded investment	$ 2,760,891	$ 2,685,994
Total percentage of recorded investment in commercial loan	100.00%	100.00%
Commercial real estate | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans and leases receivables, recorded investment	$ 2,625,232	$ 2,588,847
Total percentage of recorded investment in commercial loan	95.10%	96.40%
Commercial real estate | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans and leases receivables, recorded investment	$ 68,204	$ 66,436
Total percentage of recorded investment in commercial loan	2.50%	2.50%
Commercial real estate | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans and leases receivables, recorded investment	$ 67,455	$ 30,711
Total percentage of recorded investment in commercial loan	2.40%	1.10%
Commercial and industrial
Financing Receivable, Recorded Investment [Line Items]
Loans and leases receivables, recorded investment	$ 1,406,950	$ 1,433,266
Total percentage of recorded investment in commercial loan	100.00%	100.00%
Commercial and industrial | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans and leases receivables, recorded investment	$ 1,294,478	$ 1,345,810
Total percentage of recorded investment in commercial loan	92.00%	93.90%
Commercial and industrial | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans and leases receivables, recorded investment	$ 65,557	$ 54,320
Total percentage of recorded investment in commercial loan	4.70%	3.80%
Commercial and industrial | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans and leases receivables, recorded investment	$ 46,915	$ 33,136
Total percentage of recorded investment in commercial loan	3.30%	2.30%
Commercial construction
Financing Receivable, Recorded Investment [Line Items]
Loans and leases receivables, recorded investment	$ 324,141	$ 384,334
Total percentage of recorded investment in commercial loan	99.99%	100.00%
Commercial construction | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans and leases receivables, recorded investment	$ 303,985	$ 368,105
Total percentage of recorded investment in commercial loan	93.80%	95.80%
Commercial construction | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans and leases receivables, recorded investment	$ 14,919	$ 9,345
Total percentage of recorded investment in commercial loan	4.60%	2.40%
Commercial construction | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans and leases receivables, recorded investment	$ 5,237	$ 6,884
Total percentage of recorded investment in commercial loan	1.60%	1.80%

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Allowance for Loan Losses - Additional Information (Details)	3 Months Ended
	Mar. 31, 2018 USD ($)
Receivables [Abstract]
Loans considered nonperforming (in days)	90 days
Evaluation for impairment of substandard and nonaccrual commercial loans	$ 500,000.0

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Allowance for Loan Losses - Recorded Investment in Consumer Loan Classes by Performing and Nonperforming Status (Details) - Consumer - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Financing Receivable, Recorded Investment [Line Items]
Loans and leases receivables, recorded investment	$ 1,238,631	$ 1,257,855
Percentage of Total	100.00%	100.00%
Performing
Financing Receivable, Recorded Investment [Line Items]
Loans and leases receivables, recorded investment	$ 1,227,738	$ 1,246,904
Percentage of Total	99.10%	99.10%
Nonperforming
Financing Receivable, Recorded Investment [Line Items]
Loans and leases receivables, recorded investment	$ 10,893	$ 10,951
Percentage of Total	0.90%	0.90%
Residential mortgage
Financing Receivable, Recorded Investment [Line Items]
Loans and leases receivables, recorded investment	$ 692,385	$ 698,774
Percentage of Total	100.00%	100.00%
Residential mortgage | Performing
Financing Receivable, Recorded Investment [Line Items]
Loans and leases receivables, recorded investment	$ 685,670	$ 691,609
Percentage of Total	99.00%	99.00%
Residential mortgage | Nonperforming
Financing Receivable, Recorded Investment [Line Items]
Loans and leases receivables, recorded investment	$ 6,715	$ 7,165
Percentage of Total	1.00%	1.00%
Home equity
Financing Receivable, Recorded Investment [Line Items]
Loans and leases receivables, recorded investment	$ 474,850	$ 487,326
Percentage of Total	100.00%	100.00%
Home equity | Performing
Financing Receivable, Recorded Investment [Line Items]
Loans and leases receivables, recorded investment	$ 470,741	$ 483,611
Percentage of Total	99.10%	99.20%
Home equity | Nonperforming
Financing Receivable, Recorded Investment [Line Items]
Loans and leases receivables, recorded investment	$ 4,109	$ 3,715
Percentage of Total	0.90%	0.80%
Installment and other consumer
Financing Receivable, Recorded Investment [Line Items]
Loans and leases receivables, recorded investment	$ 66,890	$ 67,204
Percentage of Total	100.00%	100.00%
Installment and other consumer | Performing
Financing Receivable, Recorded Investment [Line Items]
Loans and leases receivables, recorded investment	$ 66,821	$ 67,133
Percentage of Total	99.90%	99.90%
Installment and other consumer | Nonperforming
Financing Receivable, Recorded Investment [Line Items]
Loans and leases receivables, recorded investment	$ 69	$ 71
Percentage of Total	0.10%	0.10%
Consumer construction
Financing Receivable, Recorded Investment [Line Items]
Loans and leases receivables, recorded investment	$ 4,506	$ 4,551
Percentage of Total	100.00%	100.00%
Consumer construction | Performing
Financing Receivable, Recorded Investment [Line Items]
Loans and leases receivables, recorded investment	$ 4,506	$ 4,551
Percentage of Total	100.00%	100.00%
Consumer construction | Nonperforming
Financing Receivable, Recorded Investment [Line Items]
Loans and leases receivables, recorded investment	$ 0	$ 0
Percentage of Total	0.00%	0.00%

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Allowance for Loan Losses - Investments in Loans Considered to be Impaired and Related Information on Impaired Loans (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Financing Receivable, Impaired [Line Items]
With a related allowance recorded, Recorded Investment	$ 695		$ 1,783
With a related allowance recorded, Unpaid Principal Balance	710		1,835
Impaired Financing Receivable, Related Allowance	576		77
Without a related allowance recorded, Recorded Investment	29,197		25,040
Without a related allowance, Unpaid Principal Balance	33,964		31,302
Impaired Financing Receivable, Recorded Investment	29,892		26,823
Impaired Financing Receivable, Unpaid Principal Balance, Total	34,674		33,137
With a related allowance recorded, Average Recorded Investment	628	$ 10,035
With a related allowance recorded, Interest Income Recognized	12	72
Without a related allowance recorded, Average Recorded Investment	24,779	37,944
Without a related allowance recorded, Interest Income Recognized	327	242
Impaired Financing Receivable, Average Recorded Investment, Total	25,407	47,979
Impaired Financing Receivable, Interest Income Recognized, Total	339	314
Commercial real estate
Financing Receivable, Impaired [Line Items]
With a related allowance recorded, Recorded Investment	0		0
With a related allowance recorded, Unpaid Principal Balance	0		0
Impaired Financing Receivable, Related Allowance	0		0
Without a related allowance recorded, Recorded Investment	3,774		3,546
Without a related allowance, Unpaid Principal Balance	4,034		3,811
Impaired Financing Receivable, Recorded Investment	3,774		3,546
Impaired Financing Receivable, Unpaid Principal Balance, Total	4,034		3,811
With a related allowance recorded, Average Recorded Investment	0	0
With a related allowance recorded, Interest Income Recognized	0	0
Without a related allowance recorded, Average Recorded Investment	3,817	8,581
Without a related allowance recorded, Interest Income Recognized	43	33
Impaired Financing Receivable, Average Recorded Investment, Total	3,817	8,581
Impaired Financing Receivable, Interest Income Recognized, Total	43	33
Commercial and industrial
Financing Receivable, Impaired [Line Items]
With a related allowance recorded, Recorded Investment	656		1,735
With a related allowance recorded, Unpaid Principal Balance	671		1,787
Impaired Financing Receivable, Related Allowance	537		29
Without a related allowance recorded, Recorded Investment	11,917		5,549
Without a related allowance, Unpaid Principal Balance	13,972		7,980
Impaired Financing Receivable, Recorded Investment	12,573		7,284
Impaired Financing Receivable, Unpaid Principal Balance, Total	14,643		9,767
With a related allowance recorded, Average Recorded Investment	586	10,008
With a related allowance recorded, Interest Income Recognized	11	72
Without a related allowance recorded, Average Recorded Investment	6,688	11,410
Without a related allowance recorded, Interest Income Recognized	110	43
Impaired Financing Receivable, Average Recorded Investment, Total	7,274	21,418
Impaired Financing Receivable, Interest Income Recognized, Total	121	115
Commercial construction
Financing Receivable, Impaired [Line Items]
With a related allowance recorded, Recorded Investment	0		0
With a related allowance recorded, Unpaid Principal Balance	0		0
Impaired Financing Receivable, Related Allowance	0		0
Without a related allowance recorded, Recorded Investment	3,444		5,464
Without a related allowance, Unpaid Principal Balance	4,954		8,132
Impaired Financing Receivable, Recorded Investment	3,444		5,464
Impaired Financing Receivable, Unpaid Principal Balance, Total	4,954		8,132
With a related allowance recorded, Average Recorded Investment	0	0
With a related allowance recorded, Interest Income Recognized	0	0
Without a related allowance recorded, Average Recorded Investment	3,446	6,239
Without a related allowance recorded, Interest Income Recognized	36	37
Impaired Financing Receivable, Average Recorded Investment, Total	3,446	6,239
Impaired Financing Receivable, Interest Income Recognized, Total	36	37
Consumer real estate
Financing Receivable, Impaired [Line Items]
With a related allowance recorded, Recorded Investment	0		21
With a related allowance recorded, Unpaid Principal Balance	0		21
Impaired Financing Receivable, Related Allowance	0		21
Without a related allowance recorded, Recorded Investment	10,052		10,467
Without a related allowance, Unpaid Principal Balance	10,987		11,357
Impaired Financing Receivable, Recorded Investment	10,052		10,488
Impaired Financing Receivable, Unpaid Principal Balance, Total	10,987		11,378
With a related allowance recorded, Average Recorded Investment	0	26
With a related allowance recorded, Interest Income Recognized	0	0
Without a related allowance recorded, Average Recorded Investment	10,816	11,692
Without a related allowance recorded, Interest Income Recognized	138	129
Impaired Financing Receivable, Average Recorded Investment, Total	10,816	11,718
Impaired Financing Receivable, Interest Income Recognized, Total	138	129
Other consumer
Financing Receivable, Impaired [Line Items]
With a related allowance recorded, Recorded Investment	39		27
With a related allowance recorded, Unpaid Principal Balance	39		27
Impaired Financing Receivable, Related Allowance	39		27
Without a related allowance recorded, Recorded Investment	10		14
Without a related allowance, Unpaid Principal Balance	17		22
Impaired Financing Receivable, Recorded Investment	49		41
Impaired Financing Receivable, Unpaid Principal Balance, Total	56		$ 49
With a related allowance recorded, Average Recorded Investment	42	1
With a related allowance recorded, Interest Income Recognized	1	0
Without a related allowance recorded, Average Recorded Investment	12	22
Without a related allowance recorded, Interest Income Recognized	0	0
Impaired Financing Receivable, Average Recorded Investment, Total	54	23
Impaired Financing Receivable, Interest Income Recognized, Total	$ 1	$ 0

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Allowance for Loan Losses - Summary of Allowance for Loan Losses (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	$ 56,390	$ 52,775
Charge-offs	(1,450)	(2,942)
Recoveries	1,634	800
Net (Charge-offs)/ Recoveries	184	(2,142)
Provision for loan losses	2,472	5,183
Balance at End of Period	59,046	55,816
Commercial real estate
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	27,235	19,976
Charge-offs	0	(390)
Recoveries	49	78
Net (Charge-offs)/ Recoveries	49	(312)
Provision for loan losses	3,679	906
Balance at End of Period	30,963	20,570
Commercial and industrial
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	8,966	10,810
Charge-offs	(829)	(715)
Recoveries	117	187
Net (Charge-offs)/ Recoveries	(712)	(528)
Provision for loan losses	2,218	2,962
Balance at End of Period	10,472	13,244
Commercial construction
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	13,167	13,999
Charge-offs	0	(644)
Recoveries	1,129	256
Net (Charge-offs)/ Recoveries	1,129	(388)
Provision for loan losses	(3,575)	491
Balance at End of Period	10,721	14,102
Consumer real estate
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	5,479	6,095
Charge-offs	(161)	(759)
Recoveries	238	103
Net (Charge-offs)/ Recoveries	77	(656)
Provision for loan losses	(138)	517
Balance at End of Period	5,418	5,956
Other consumer
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	1,543	1,895
Charge-offs	(460)	(434)
Recoveries	101	176
Net (Charge-offs)/ Recoveries	(359)	(258)
Provision for loan losses	288	307
Balance at End of Period	$ 1,472	$ 1,944

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Allowance for Loan Losses - Summary of Allowance for Loan Losses and Recorded Investments (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017	Dec. 31, 2016
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan Losses, Individually Evaluated for Impairment	$ 576	$ 77
Allowance for Loan Losses, Collectively Evaluated for Impairment	58,470	56,313
Total Allowance for Loan Losses	59,046	56,390	$ 55,816	$ 52,775
Portfolio Loans, Individually Evaluated for Impairment	29,892	26,823
Portfolio Loans, Collectively Evaluated for Impairment	5,700,721	5,734,626
Total Portfolio Loans	5,730,613	5,761,449
Commercial real estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan Losses, Individually Evaluated for Impairment	0	0
Allowance for Loan Losses, Collectively Evaluated for Impairment	30,963	27,235
Total Allowance for Loan Losses	30,963	27,235	20,570	19,976
Portfolio Loans, Individually Evaluated for Impairment	3,774	3,546
Portfolio Loans, Collectively Evaluated for Impairment	2,757,117	2,682,448
Total Portfolio Loans	2,760,891	2,685,994
Commercial and industrial
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan Losses, Individually Evaluated for Impairment	537	29
Allowance for Loan Losses, Collectively Evaluated for Impairment	9,935	8,937
Total Allowance for Loan Losses	10,472	8,966	13,244	10,810
Portfolio Loans, Individually Evaluated for Impairment	12,573	7,284
Portfolio Loans, Collectively Evaluated for Impairment	1,394,377	1,425,982
Total Portfolio Loans	1,406,950	1,433,266
Commercial construction
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan Losses, Individually Evaluated for Impairment	0	0
Allowance for Loan Losses, Collectively Evaluated for Impairment	10,721	13,167
Total Allowance for Loan Losses	10,721	13,167	14,102	13,999
Portfolio Loans, Individually Evaluated for Impairment	3,444	5,464
Portfolio Loans, Collectively Evaluated for Impairment	320,697	378,870
Total Portfolio Loans	324,141	384,334
Consumer real estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan Losses, Individually Evaluated for Impairment	0	21
Allowance for Loan Losses, Collectively Evaluated for Impairment	5,418	5,458
Total Allowance for Loan Losses	5,418	5,479	5,956	6,095
Portfolio Loans, Individually Evaluated for Impairment	10,052	10,488
Portfolio Loans, Collectively Evaluated for Impairment	1,161,689	1,180,163
Total Portfolio Loans	1,171,741	1,190,651
Other consumer
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan Losses, Individually Evaluated for Impairment	39	27
Allowance for Loan Losses, Collectively Evaluated for Impairment	1,433	1,516
Total Allowance for Loan Losses	1,472	1,543	$ 1,944	$ 1,895
Portfolio Loans, Individually Evaluated for Impairment	49	41
Portfolio Loans, Collectively Evaluated for Impairment	66,841	67,163
Total Portfolio Loans	$ 66,890	$ 67,204

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Derivative Instruments and Hedging Activities - Additional Information (Details)	3 Months Ended
	Mar. 31, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Period for commitments	60 days

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Derivative Instruments and Hedging Activities - Value of Derivative Assets and Derivative Liabilities (Details) - Not Designated as Hedging Instruments - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Other Assets
Derivatives not Designated as Hedging Instruments
Fair value, Derivatives (included in Other Assets)	$ 4,669	$ 3,074
Other Assets | Interest rate swaps
Derivatives not Designated as Hedging Instruments
Fair value, Derivatives (included in Other Assets)	4,669	3,074
Notional amount, Derivatives (included in Other Assets)	253,580	263,841
Net collateral received/posted, Derivatives	2,011	0
Other Assets | Interest rate lock commitments
Derivatives not Designated as Hedging Instruments
Fair value, Derivatives (included in Other Assets)	271	226
Notional amount, Derivatives (included in Other Assets)	9,710	6,860
Other Assets | Forward sale contracts
Derivatives not Designated as Hedging Instruments
Fair value, Derivatives (included in Other Assets)	0	0
Notional amount, Derivatives (included in Other Assets)	0	0
Other Liabilities
Derivatives not Designated as Hedging Instruments
Fair value, Derivatives (included in Other Liabilities)	4,765	3,055
Other Liabilities | Interest rate swaps
Derivatives not Designated as Hedging Instruments
Fair value, Derivatives (included in Other Liabilities)	4,765	3,055
Notional amount, Derivatives (included in Other Liabilities)	253,580	263,841
Net collateral received/posted, Derivatives	0	1,448
Other Liabilities | Interest rate lock commitments
Derivatives not Designated as Hedging Instruments
Fair value, Derivatives (included in Other Liabilities)	0	0
Notional amount, Derivatives (included in Other Liabilities)	0	0
Other Liabilities | Forward sale contracts
Derivatives not Designated as Hedging Instruments
Fair value, Derivatives (included in Other Liabilities)	24	5
Notional amount, Derivatives (included in Other Liabilities)	$ 9,165	$ 6,580

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Derivative Instruments and Hedging Activities - Schedule of Gross Amounts of Derivative Assets and Derivative Liabilities (Details) - Not Designated as Hedging Instruments - USD ($) $ in Thousands		Mar. 31, 2018	Dec. 31, 2017
Other Assets
Derivatives (included in Other Assets)
Gross amounts recognized		$ 5,818	$ 4,974
Gross amounts offset		(1,149)	(1,900)
Net Amounts Presented in the Consolidated Balance Sheets		4,669	3,074
Gross amounts not offset	[1]	(2,011)	0
Net Amount		2,658	3,074
Other Liabilities
Derivatives (included in Other Liabilities)
Gross amounts recognized		5,914	4,955
Gross amounts offset		(1,149)	(1,900)
Net Amounts Presented in the Consolidated Balance Sheets		4,765	3,055
Gross amounts not offset	[1]	0	(1,448)
Net Amount		$ 4,765	$ 1,607

[1] Amounts represent received/posted collateral.

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Derivative Instruments and Hedging Activities - Amount of Gain or Loss Recognized in Income on Derivatives (Details) - Not Designated as Hedging Instruments - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Derivative Instruments, Gain (Loss) [Line Items]
Derivatives (Loss)/Gain	$ 141	$ 221
Interest rate swap contracts—commercial loans
Derivative Instruments, Gain (Loss) [Line Items]
Derivatives (Loss)/Gain	115	24
Interest rate lock commitments—mortgage loans
Derivative Instruments, Gain (Loss) [Line Items]
Derivatives (Loss)/Gain	45	233
Forward sale contracts—mortgage loans
Derivative Instruments, Gain (Loss) [Line Items]
Derivatives (Loss)/Gain	$ (19)	$ (36)

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Borrowings - Additional Information (Details) - USD ($)	Mar. 31, 2018	Dec. 31, 2017
Long Term And Short Term Debt [Line Items]
Total long-term debt outstanding at a fixed rate	$ 8,500,000
Total long-term debt outstanding at a variable rate	38,100,000
Federal Home Loan Bank Advance
Long Term And Short Term Debt [Line Items]
Total borrowings	572,000,000	$ 587,000,000
Short-term borrowings	525,000,000
Long-term borrowings	46,700,000
Maximum borrowing capacity	2,500,000,000.0
Borrowing capacity utilized	709,000,000
Letter of credit to collateralize public funds	137,000,000
Remaining borrowing capacity	1,800,000,000
Mortgage Backed Securities
Long Term And Short Term Debt [Line Items]
Mortgage backed securities pledged as collateral	$ 49,200,000	$ 56,800,000

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Borrowings - Summary of Information Pertaining to Borrowings (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Long Term And Short Term Debt [Line Items]
Short-term borrowings, Balance	$ 569,617	$ 590,161
Long-term borrowings, Balance	92,303	92,920
Total Borrowings, Balance	$ 661,920	$ 683,081
Short-term borrowings, Weighted Average Rate	1.75%	1.38%
Long-term borrowings, Weighted Average Rate	3.32%	2.81%
Total Borrowings, Weighted Average Rate	1.97%	1.57%
Securities sold under repurchase agreements
Long Term And Short Term Debt [Line Items]
Short-term borrowings, Balance	$ 44,617	$ 50,161
Short-term borrowings, Weighted Average Rate	0.42%	0.39%
Short-term borrowings
Long Term And Short Term Debt [Line Items]
Short-term borrowings, Balance	$ 525,000	$ 540,000
Short-term borrowings, Weighted Average Rate	1.86%	1.47%
Long-term borrowings
Long Term And Short Term Debt [Line Items]
Long-term borrowings, Balance	$ 46,684	$ 47,301
Long-term borrowings, Weighted Average Rate	2.09%	1.88%
Junior subordinated debt securities
Long Term And Short Term Debt [Line Items]
Long-term borrowings, Balance	$ 45,619	$ 45,619
Long-term borrowings, Weighted Average Rate	4.58%	3.78%

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Commitments and Contingencies - Additional Information (Details) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Commitments to extend credit
Other Commitments [Line Items]
Allowance for unfunded commitments	$ 2.1	$ 2.2

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Commitments and Contingencies - Commitments and Letters of Credit (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Other Commitments [Line Items]
Commitments and letters of credit	$ 1,533,297	$ 1,501,346
Commitments to extend credit
Other Commitments [Line Items]
Commitments and letters of credit	1,454,312	1,420,428
Standby letters of credit
Other Commitments [Line Items]
Commitments and letters of credit	$ 78,985	$ 80,918

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Other Comprehensive Income (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2018	Mar. 31, 2017
Pre-Tax Amount
Other comprehensive income (loss), before tax		$ (8,853)	$ 1,831
Tax (Expense) Benefit
Other comprehensive income (loss), tax		1,880	(643)
Net of Tax Amount
Other Comprehensive Income/(Loss)		(6,973)	1,188
Accumulated Net Investment Gain (Loss) Attributable to Parent
Pre-Tax Amount
Change in net unrealized gains/(losses) on debt securities available-for-sale		(9,474)	1,662
Reclassification adjustment for net (gains)/losses on securities available-for-sale included in net income	[1]	0	(370)
Tax (Expense) Benefit
Change in net unrealized gains/(losses) on debt securities available-for-sale		2,012	(584)
Reclassification adjustment for net (gains)/losses on securities available-for-sale included in net income	[1]	0	130
Net of Tax Amount
Change in net unrealized gains/(losses) on debt securities available-for-sale		(7,462)	1,078
Reclassification adjustment for net (gains)/losses on securities available-for-sale included in net income	[1]	0	(240)
Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent
Pre-Tax Amount
Other comprehensive income (loss), before tax		621	539
Tax (Expense) Benefit
Other comprehensive income (loss), tax		(132)	(189)
Net of Tax Amount
Other Comprehensive Income/(Loss)		$ 489	$ 350

[1] Reclassification adjustments are comprised of realized security gains or losses. The realized gains or losses have been reclassified out of accumulated other comprehensive income/(loss) and have affected certain lines in the Consolidated Statements of Comprehensive Income as follows; the pre-tax amount is included in securities gains/losses-net, the tax expense amount is included in the provision for income taxes and the net of tax amount is included in net income.

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Employee Benefits - Additional Information (Details)	3 Months Ended
	Mar. 31, 2018
Retirement Benefits [Abstract]
Expected long-term rate of return on plan assets	7.50%

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Employee Benefits - Components of Net Periodic Pension Cost and Other Changes in Plan Assets and Benefit (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Components of Net Periodic Pension Cost
Service cost—benefits earned during the period	$ 0	$ 0
Interest cost on projected benefit obligation	967	1,025
Expected return on plan assets	(1,567)	(1,582)
Amortization of prior service credit	544	474
Recognized net actuarial loss	0	0
Net Periodic Pension Expense	$ (56)	$ (83)

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Qualified Affordable Housing Projects (Details)	3 Months Ended
	Mar. 31, 2018 USD ($) commitment	Mar. 31, 2017 USD ($)	Dec. 31, 2017 USD ($) commitment
Other Commitments [Line Items]
Qualified Affordable Housing Project Investments, Commitment			$ 0
Investment in qualified affordable housing projects	$ 8,000,000		8,700,000
Amortization expense included in noninterest expense	700,000	$ 800,000
Tax credits	800,000	$ 900,000
Federal Historic Tax Credit Project
Other Commitments [Line Items]
Investment in qualified affordable housing projects	$ 800,000		$ 800,000
Number of open commitments to fund future investments | commitment	1		1

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Sale of a Majority Interest of Insurance Business (Details) - USD ($) $ in Thousands		3 Months Ended
	Jan. 01, 2018	Mar. 31, 2018	Mar. 31, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain on sale of a majority interest of insurance business		$ 1,873	$ 0
New Partnership
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Equity method investment, ownership percentage	30.00%
Subsidiaries | S&T Evergreen Insurance LLC
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Percentage of ownership in subsidiary sold	70.00%
Gain on sale of a majority interest of insurance business	$ 1,900

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Share Repurchase Plan (Details)	Mar. 19, 2018 USD ($)
Equity [Abstract]
Stock repurchase program, authorized amount	$ 50,000,000