10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, DC 20549

FORM 10-Q

(Mark One)

☒ 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: 001-38184

CAMBRIDGE BANCORP

(Exact Name of Registrant as Specified in its Charter)

Massachusetts	04-2777442
(State or other jurisdiction of incorporation or organization)	(I.R.S. Employer Identification No.)
1336 Massachusetts Avenue Cambridge, MA	02138
(Address of principal executive offices)	(Zip Code)

Registrant’s telephone number, including area code: (617) 876-5500

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  ☒    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 (§ 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  ☐    No  ☒

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

Large accelerated filer	☐		Accelerated filer	☐
Non-accelerated filer	☒	(Do not check if a small reporting company)	Small 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  ☒

As of April 30, 2018, the registrant had 4,099,865 shares of common stock, $1.00 par value per share, outstanding.

Table of Contents

CAMBRIDGE BANCORP AND SUBSIDIARIES

		Page
PART I.	FINANCIAL INFORMATION	1
Item 1.	Financial Statements (Unaudited)	1
	Unaudited Consolidated Balance Sheets	1
	Unaudited Consolidated Statements of Income	2
	Unaudited Consolidated Statements of Comprehensive Income (Loss)	3
	Unaudited Consolidated Statements of Changes in Shareholders’ Equity	4
	Unaudited Consolidated Statements of Cash Flows	5
	Notes to Unaudited Consolidated Financial Statements	6
Item 2.	Management’s Discussion and Analysis of Financial Condition and Results of Operations	30
Item 3.	Quantitative and Qualitative Disclosures About Market Risk	46
Item 4.	Controls and Procedures	47
PART II.	OTHER INFORMATION	48
Item 1.	Legal Proceedings	48
Item 1A.	Risk Factors	48
Item 2.	Unregistered Sales of Equity Securities and Use of Proceeds	48
Item 3.	Defaults Upon Senior Securities	48
Item 4.	Mine Safety Disclosures	48
Item 5.	Other Information	48
Item 6.	Exhibits	49
Signatures		50

i

PART I—FINANCIAL INFORMATION

Item 1. Financial Statements.

CAMBRIDGE BANCORP AND SUBSIDIARIES

UNAUDITED CONSOLIDATED BALANCE SHEETS

	March 31, 2018			December 31, 2017
	(dollars in thousands, except par value)
Assets
Cash and cash equivalents	$	56,265		$	103,591
Investment securities
Available for sale, at fair value (amortized cost $203,507 and $208,911, respectively)		197,935			205,017
Held to maturity, at amortized cost (fair value $262,432 and $233,554, respectively)		264,409			232,188
Total investment securities		462,344			437,205
Loans held for sale, at lower of cost or fair value		—			—
Loans
Residential mortgage		541,599			538,920
Commercial mortgage		656,289			633,649
Home equity		71,592			74,444
Commercial & Industrial		75,365			65,295
Consumer		36,909			38,591
Total loans		1,381,754			1,350,899
Less: allowance for loan losses		(15,732	)		(15,320	)
Net loans		1,366,022			1,335,579
Federal Home Loan Bank of Boston Stock, at cost		4,242			4,242
Bank owned life insurance		30,535			31,083
Banking premises and equipment, net		9,316			9,310
Deferred income taxes, net		7,910			8,273
Accrued interest receivable		5,059			5,128
Other assets		20,057			15,523
Total assets	$	1,961,750		$	1,949,934
Liabilities
Deposits
Demand	$	503,089		$	493,613
Interest bearing checking		436,841			462,957
Money market		63,508			69,259
Savings		632,707			589,741
Certificates of deposit		146,247			159,830
Total deposits		1,782,392			1,775,400
Short-term borrowings		—			—
Long-term borrowings		3,537			3,579
Other liabilities		24,948			22,998
Total liabilities		1,810,877			1,801,977
Shareholders’ Equity
Common stock, par value $1.00; Authorized 10,000,000 shares; Outstanding: 4,100,747    shares and 4,082,188 shares, respectively		4,101			4,082
Additional paid-in capital		36,065			35,663
Retained earnings		119,196			114,093
Accumulated other comprehensive loss		(8,489	)		(5,881	)
Total shareholders’ equity		150,873			147,957
Total liabilities and shareholders’ equity	$	1,961,750		$	1,949,934

The accompanying notes are an integral part of these unaudited consolidated financial statements.

1

CAMBRIDGE BANCORP AND SUBSIDIARIES

UNAUDITED CONSOLIDATED STATEMENTS OF INCOME

	Three Months Ended March 31,
	2018		2017
	(dollars in thousands, except share data)
Interest and dividend income
Interest on taxable loans	$	13,378	$	12,373
Interest on tax-exempt loans		96		131
Interest on taxable investment securities		1,714		1,394
Interest on tax-exempt investment securities		622		665
Dividends on FHLB of Boston stock		51		42
Interest on overnight investments		271		68
Total interest and dividend income		16,132		14,673
Interest expense
Interest on deposits		962		691
Interest on borrowed funds		17		21
Total interest expense		979		712
Net interest and dividend income		15,153		13,961
Provision for loan losses		409		30
Net interest and dividend income after provision for    loan losses		14,744		13,931
Noninterest income
Wealth management revenue		6,126		5,362
Deposit account fees		750		813
ATM/Debit card income		271		259
Bank owned life insurance income		128		162
(Loss) gain on disposition of investment securities		—		(2	)
Gain on loans held for sale		27		235
Loan related derivative income		472		188
Other income		404		310
Total noninterest income		8,178		7,327
Noninterest expense
Salaries and employee benefits		10,073		9,156
Occupancy and equipment		2,227		2,253
Data processing		1,230		1,323
Professional services		887		870
Marketing		438		270
FDIC Insurance		151		161
Other expenses		495		913
Total noninterest expense		15,501		14,946
Income before income taxes		7,421		6,312
Income tax expense		1,616		1,984
Net income	$	5,805	$	4,328
Share data
Weighted average number of shares outstanding, basic		4,053,355		4,011,925
Weighted average number of shares outstanding, diluted		4,071,975		4,050,791
Basic earnings per share	$	1.42	$	1.07
Diluted earnings per share	$	1.41	$	1.06

The accompanying notes are an integral part of these unaudited consolidated financial statements.

2

CAMBRIDGE BANCORP AND SUBSIDIARIES

UNAUDITED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME

	Three Months Ended March 31,
	2018			2017
	(dollars in thousands)
Net income	$	5,805		$	4,328
Other comprehensive income/(loss), net of tax:
Unrealized gains/(losses) on available for sale securities
Unrealized holding gains/(losses) arising during period		(1,352	)		189
Less: reclassification adjustment for losses/(gains) included in    net income		—			1
Total unrealized gains/(losses) on securities		(1,352	)		190
Defined benefit retirement plans
Change in retirement liabilities		10			132
Other comprehensive income/(loss)		(1,342	)		322
Comprehensive income	$	4,463		$	4,650

The accompanying notes are an integral part of these unaudited consolidated financial statements.

3

CAMBRIDGE BANCORP AND SUBSIDIARIES

UNAUDITED CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS’ EQUITY

	Common Stock		Additional Paid-In Capital		Retained Earnings			Accumulated Other Comprehensive (Loss ) / Income			Total Shareholders’ Equity
	(dollars in thousands, except per share data)
Balance at December 31, 2016	$	4,037	$	33,253	$	107,262		$	(9,881	)	$	134,671
Net income		—		—		4,328			—			4,328
Other comprehensive income		—		—		—			322			322
Share based compensation		34		1,343		(403	)		—			974
Dividends declared ($0.46 per share)		—		—		(1,868	)		—			(1,868	)
Balance at March 31, 2017	$	4,071	$	34,596	$	109,319		$	(9,559	)	$	138,427
Balance at December 31, 2017	$	4,082	$	35,663	$	114,093		$	(5,881	)	$	147,957
Cumulative effect of accounting changes		—		—		1,266			(1,266	)		—
Net income		—		—		5,805			—			5,805
Other comprehensive income		—		—		—			(1,342	)		(1,342	)
Share based compensation		19		402		—			—			421
Dividends declared ($0.48 per share)		—		—		(1,968	)		—			(1,968	)
Balance at March 31, 2018	$	4,101	$	36,065	$	119,196		$	(8,489	)	$	150,873

The accompanying notes are an integral part of these unaudited consolidated financial statements.

4

CAMBRIDGE BANCORP AND SUBSIDIARIES

UNAUDITED CONSOLIDATED STATEMENTS OF CASH FLOWS

	Three Months Ended March 31,
	2018			2017
	(dollars in thousands)
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$	5,805		$	4,328
Adjustments to reconcile net income to net cash provided by operating    activities:
Provision for loan losses		409			30
Amortization of deferred charges and fees, net		163			324
Depreciation and amortization		464			491
Bank owned life insurance income		(128	)		(162	)
Loss/(gain) on disposition of investment securities		—			2
Share based compensation		421			974
Change in accrued interest receivable		69			328
Deferred income tax expense (benefit)		770			818
Change in other assets, net		(4,944	)		(1,275	)
Change in other liabilities, net		2,371			(575	)
Change in loans held for sale		—			5,788
Net cash provided by operating activities		5,400			11,071
CASH FLOWS FROM INVESTING ACTIVITIES
Origination of loans		(131,953	)		(66,439	)
Proceeds from principal payments of loans		101,197			75,672
Proceeds from calls/maturities of securities available for sale		5,208			18,995
Proceeds from sales of securities available for sale		—			32,701
Purchase of securities available for sale		—			(5,091	)
Proceeds from calls/maturities of securities held to maturity		7,777			2,396
Purchase of securities held to maturity		(40,125	)		(84,425	)
Proceeds from settlement of bank owned life insurance policies		676			—
(Purchase) sale of FHLB of Boston stock		—			(553	)
Purchase of banking premises and equipment		(470	)		(289	)
Net cash used by investing activities		(57,690	)		(27,033	)
CASH FLOWS FROM FINANCING ACTIVITIES
Change in demand, interest bearing, money market and savings accounts		20,575			(7,330	)
Change in certificates of deposit		(13,601	)		(1,150	)
Change in short-term borrowings		—			—
Repayment of long-term borrowings		(42	)		(42	)
Cash dividends paid on common stock		(1,968	)		(1,868	)
Net cash provided by financing activities		4,964			(10,390	)
Net decrease in cash and cash equivalents		(47,326	)		(26,352	)
Cash and cash equivalents at beginning of period		103,591			54,050
Cash and cash equivalents at end of period	$	56,265		$	27,698
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION:
Cash paid during the period for:
Interest	$	975		$	709
Income taxes	$	—		$	840

The accompanying notes are an integral part of these unaudited consolidated financial statements.

5

CAMBRIDGE BANCORP AND SUBSIDIARIES

Notes to Unaudited Consolidated Financial Statements

1. BASIS OF PRESENTATION

The unaudited consolidated financial statements include the accounts of Cambridge Bancorp (the “Company”) and its wholly owned subsidiary, Cambridge Trust Company (the “Bank”), and the Bank’s wholly owned subsidiaries, Cambridge Trust Company of New Hampshire Inc., CTC Security Corporation, and CTC Security Corporation III. References to the Company herein relate to the consolidated group of companies. All significant intercompany accounts and transactions have been eliminated in preparation of the consolidated financial statements.

The Company is a state-chartered, federally registered bank holding company headquartered in Cambridge, Massachusetts and was incorporated in 1983. The Company is the sole shareholder of the Bank, a Massachusetts trust company chartered in 1890, which is a commercial bank.  We are a private bank offering a full range of private banking and wealth management services to our clients.  The private banking business, the Company’s only reportable operating segment is managed as a single strategic unit.  

The unaudited consolidated financial statements reflect all adjustments (consisting of normal recurring adjustments) and disclosures necessary to present fairly the Company’s financial position, as of March 31, 2018 and December 31, 2017, respectively, and the results of operations and cash flows for the interim periods presented in accordance with U.S. generally accepted accounting principles (“GAAP”). Interim results are not necessarily reflective of the results of the entire year.

For further information, refer to the consolidated financial statements and notes thereto included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2017, filed with the Securities and Exchange Commission.

2. 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 disclosure of contingent assets and liabilities at the date of the financial statements. Actual results could differ from those estimates. The allowance for loan losses, the fair values of financial instruments, and the valuation of deferred tax assets are particularly subject to change.

3. Subsequent Events

Management has reviewed events occurring through May 9, 2018, the date the unaudited consolidated financial statements were available to be issued, and determined that no other subsequent events occurred requiring adjustment to or disclosure in these financial statements.

4. Recently Issued and Adopted Accounting Guidance

Accounting Standards Update No. 2018-02 - Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income (“ASU 2018-02”). On February 14, 2018, the Financial Accounting Standards Board (the “FASB”) issued amended guidance to address certain stranded income tax effects in accumulated other comprehensive income (“AOCI”) resulting from the Tax Cuts and Jobs Act. The ASU requires the following:

• A description of the accounting policy for releasing income tax effects from AOCI,

• Whether we elect to reclassify the stranded income tax effects from the Tax Cuts and Jobs Act, and

• Information about the other income tax effects that are reclassified.

The amendments in this ASU affect any organization that is required to apply the provisions of Topic 220, Income Statement—Reporting Comprehensive Income, and has items of other comprehensive income for which the related tax effects are presented in accumulated other comprehensive income, as required by GAAP. ASU 2018-02 is effective for the Company’s reporting period beginning on January 1, 2019; early adoption is permitted. The Company elected to early adopt ASU 2018-02 during the first quarter of 2018, and reclassed $1.3 million from AOCI to retained earnings in the period of adoption on the consolidated balance sheet, with zero net effect on total shareholders’ equity. This amount represents the difference in the Company’s current federal tax rate of 21% and the previous rate of 35%.  The adoption of this guidance did not have an impact on our consolidated statements of income or cash flows.  

6

Accounting Standard Update No.2017-12 - Derivatives and Hedging: Targeted Improvements to Accounting for Hedging Activities (“ASU 2017-12”). OnAugust 28, 2017, theFASB issuedanewstandardthatallowscompaniestobetteraligntheir hedgeaccountingandriskmanagementactivities. The new standard will also reducethe costandcomplexityofapplyinghedgeaccounting. Thestandardrequires companiestochangetherecognitionandpresentation oftheeffectsofhedge accountingby:

• Eliminating therequirementtoseparatelymeasureandreporthedge ineffectiveness;and

• Requiringcompaniestopresentalloftheelementsofhedgeaccounting thataffectearningsinthesameincomestatementlineasthehedgeditem.

The standard also permits hedge accounting for strategies for which hedge accounting was not historically permitted today and includes new alternatives for measuring the hedged item for fair value hedges of interest rate risk. Furthermore, the standard eases the requirements for effectiveness testing, hedge documentation, applying the critical terms match method, and introduces new alternatives that will permit companies to reduce the risk of material error corrections if they misapply the shortcut method. The new accounting standard is effective for fiscal years beginning after December 15, 2018, and interim periods within those fiscal years. Early adoption is permitted.

The new standard requires a modified retrospective transition method in which the Company will recognize the cumulative effect of the change on the opening balance of each affected component of equity in the statement of financial position as of the date of adoption. We are currently assessing the impact the adoption of this guidance will have on our consolidated balance sheets, statements of income, and cash flows.

Accounting Standards Update No. 2017-08 - Premium Amortization on Purchased Callable Debt Securities (“ASU 2017-08”). On March 30, 2017, the FASB issued guidance to amend the amortization period for certain purchased callable debt securities held at a premium. The new guidance requires entities to amortize premium on callable debt securities to the earliest call date.  Shortening the amortization period is generally expected to more closely align the interest income recognition with the expectations incorporated in the market pricing on the underlying securities. Under GAAP, entities generally amortize the premium as an adjustment of yield over the contractual life of the instrument. Debt securities held at a discount will continue to be amortized to maturity. The amended guidance is effective for fiscal years beginning after December 15, 2018 and interim periods within those fiscal years.  Early adoption is permitted. This guidance should be applied using a modified retrospective basis as of the beginning of the period of adoption. Additionally, in the period of adoption, we will provide disclosures about a change in accounting principle. We are currently assessing the impact the adoption of this guidance will have on our consolidated balance sheets, statements of income, and cash flows.

Accounting Standards Update No. 2017-07 - Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost (“ASU 2017-07”). On March 10, 2017, the FASB issued amended guidance primarily to improve the presentation of net periodic pension cost and net periodic postretirement benefit cost, as discussed below. The new guidance requires that an employer report the service cost component in the same line item or items as other compensation costs arising from services rendered by the pertinent employees during the period and all other components of net periodic benefit cost in a separate line item(s) in the statement of income. The other components of net benefit cost will be required to be presented in a separate line item. The guidance also specifies that only the service cost component will be eligible for capitalization. The amendments in this ASU are effective for fiscal years beginning after December 15, 2017.  The amendments in this ASU were applied retrospectively for the presentation of the service cost component and the other components of net periodic pension cost and net periodic postretirement benefit cost in the income statement.See Note 9 – Pension and Retirement Plans for the required disclosures and impact to the consolidated statements of income.  

Accounting Standards Update No. 2016-18 - Restricted Cash (“ASU 2016-18”).  On November 17, 2016, the FASB issued amended guidance to require that a statement of cash flows explain the change during the period in the total of cash, cash equivalents, and amounts generally described as restricted cash or restricted cash equivalents. Therefore, amounts generally described as restricted cash and restricted cash equivalents should be included with cash and cash equivalents when reconciling the beginning-of-period and end-of-period total amounts shown on the statement of cash flows. The Company adopted this standard on January 1, 2018 and it did not have an impact on our statement of cash flows.  

Accounting Standards Update No. 2016-15 - Classification of Certain Cash Receipts and Cash Payments (“ASU 2016-15”).On August 26, 2016, the FASB issued amendments to clarify guidance on the classification of certain cash receipts and payments in the statement of cash flows. This guidance is intended to reduce existing diversity in practice in how certain cash receipts and cash payments are presented and classified on the statement of cash flows. This guidance should be applied using a retrospective transition method to each period presented. The Company adopted this standard on January 1, 2018 and it did not have a material impact on our statement of cash flows.  

7

Accounting Standards Update No. 2016-13 - Financial Instruments - Measurement of Credit Losses on Financial Instruments (“ASU 2016-13”). On June 16, 2016, the FASB issued ASU 2016-13, which will significantly change how entities measure and recognize credit impairment for many financial assets. Under this standard, the new current expected credit loss model will require entities to immediately recognize an estimate of credit losses expected to occur over the remaining life of the financial assets that are in the scope of the standard. This new guidance also made targeted amendments to the current impairment model for available for sale debt securities. This guidance will be effective for the Company for the fiscal years beginning after December 15, 2019, including interim periods within those fiscal years. Early adoption for fiscal years and interim periods beginning after December 15, 2018 is permitted. We are in the process of evaluating this guidance and its effect on our consolidated balance sheets, statements of income, and cash flows. We are developing an implementation plan which will include assessment of processes, portfolio segmentation, model development, system requirements and the identification of data and resource needs to implement this standard. We are also evaluating third-party vendor solutions to assist us in implementing the requirements of ASU 2016-13.

Accounting Standards Update No. 2016-02 - Leases (“ASU 2016-02”). On February 25, 2016, the FASB issued guidance that requires recognition of lease assets and lease liabilities on the statement of condition and disclosure of key information about leasing arrangements. In particular, this guidance requires a lessee of operating or finance leases to recognize on the statement of condition a liability to make lease payments and a right-of-use asset representing its right to use the underlying asset for the lease term. However, for leases with a term of 12 months or less, a lessee is permitted to make an accounting policy election not to recognize lease assets and lease liabilities. Under previous GAAP, a lessee was not required to recognize lease assets and lease liabilities arising from operating leases on the statement of condition. The guidance becomes effective for the Company on January 1, 2019, and early adoption is permitted. We are currently assessing the impact the adoption of this guidance will have on our consolidated balance sheets, statements of income, and cash flows. We have created a project team responsible for identifying the population of leases, evaluating the required accounting changes, and developing the processes and procedures needed to implement ASU 2016-02.

Accounting Standards Update No. 2016-01 - Recognition and Measurement of Financial Assets and Financial Liabilities (“ASU 2016-01”). On January 5, 2016, the FASB issued amended guidance on certain aspects of recognition, measurement, presentation, and disclosure of financial instruments. This guidance includes, but is not limited to the following:

• Requires equity investments (with certain exceptions) to be measured at fair value with changes in fair value recognized in net income.

• Requires an entity to present separately in other comprehensive income 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.

• Requires 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 statement of condition or the accompanying notes to the financial statements.

• Clarifies that an entity must assess valuation allowances on a deferred tax asset related to available for sale debt securities in combination with its other deferred tax assets.

• Require public business entities to use the exit price notion when measuring the fair value of financial instruments for disclosure purposes.

• Eliminates the requirement for public entities 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 statement of condition.

The amendments, in general, are required to be applied by means of a cumulative-effect adjustment on the statement of condition as of the beginning of the period of adoption. The Company adopted the standard on January 1, 2018, and it did not have a material impact on our consolidated balance sheets, statements of income, or cash flows.  

Accounting Standards Update No. 2014-09 – Revenue from Contracts with Customers (“ASU 2014-09”) Topic 606. On May 28, 2014, the FASB issued Accounting Standards Update (“ASU”) No. 2014-09, “Revenue from Contracts with Customers,” which requires an entity to recognize the amount of revenue to which it expects to be entitled for the transfer of promised goods or services to customers. The new guidance supersedes current U.S. GAAP guidance on revenue recognition and requires the use of more estimates and judgments than the current revenue standards. Topic 606 does not apply to revenue associated with financial instruments, including revenue from loans and securities. In addition, certain noninterest income streams such as fees associated with mortgage servicing rights, financial guarantees, derivatives, and certain credit card fees are also not in scope of the new guidance.

8

On January 1, 2018, the Company adopted ASU No. 2014-09 and all subsequent ASUs that modified Topic 606. Topic 606 is applicable to noninterest revenue streams such as trust and asset management income, deposit related fees, interchange fees, and merchant income.

The Company completed its overall assessment of revenue streams and review of related contracts potentially affected by the ASU, including trust and asset management fees, deposit related fees and other income within noninterest income.

Based on this assessment, the Company concluded that ASU 2014-09 did not materially change the method in which the Company currently recognizes revenue for these revenue streams. The Company adopted ASU 2014-09 and its related amendments utilizing the modified retrospective approach. Since there was no net income impact upon adoption of the new guidance, a cumulative effect adjustment to opening retained earnings was not deemed necessary. Noninterest income considered in-scope of Topic 606 is discussed below.

Wealth management and trust fees

Wealth management fees are earned for providing investment management, retirement plan advisory, family office, and financial planning services to clients. The Company’s performance obligation under these contracts is satisfied over time as the wealth management services are provided. Fees are recognized monthly based on the average monthly value of the assets under management and the applicable fee rate, depending on the terms of the contract. No performance based incentives are earned on wealth management contracts. Receivables are recorded on the consolidated balance sheet in the other assets line item.

Trust fees are earned when the Company is appointed as trustee for clients. As trustee, the Company administers the client’s trust and manages the assets of the trust including investments and property. The Company’s performance obligation under these agreements is satisfied over time as the administration and management services are provided. Fees are recognized monthly based on a percentage of the market value of the account as outlined in the agreement. Receivables are recorded on the consolidated balance sheet in the other assets line item. The Company also earned fees for trust related activities. The Company’s performance obligation under these agreements is satisfied at a point in time and recognized when these services have been performed.

All of the wealth management and trust fee income on the consolidated statement of operations for the three months ended March 31, 2018 is considered in-scope of Topic 606.

Other banking fee income

The Company charges a variety of fees to its clients for services provided on the deposit and deposit management related accounts. Each fee is either transaction-based or assessed monthly. The types of fees include service charges on accounts, overdraft fees, wire transfer fees, maintenance fees, ATM fee charges, and other miscellaneous charges related to the accounts. These fees are not governed by individual contracts with clients. They are charges to clients based on disclosures presented to clients upon opening these accounts along with updated disclosures when changes are made to the fee structures. The transaction-based fees are recognized in revenue when charged to the client based on specific activity on the client’s account. Monthly service and maintenance charges are recognized in the month they are earned and are charged directly to the client’s account.

5. Cash and Due from Banks

At March 31, 2018 and December 31, 2017, cash and due from banks totaled $56.3 million and $103.6 million, respectively. Of this amount, $15.4 million and $12.8 million, respectively, were maintained to satisfy the reserve requirements of the Federal Reserve Bank of Boston (“FRB Boston”). Additionally, at March 31, 2018 and December 31, 2017, the Company pledged $500,000 to the New Hampshire Banking Department relating to Cambridge Trust Company of New Hampshire, Inc.’s operations in that state.

9

6. Investment Securities

Investment securities have been classified in the unaudited consolidated balance sheets according to management’s intent. The carrying amounts of securities and their approximate fair values were as follows:

	March 31, 2018									December 31, 2017
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value		Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
	(dollars in thousands)
Available for sale securities
U.S. GSE obligations	$	90,017	$	—	$	(1,594	)	$	88,423	$	90,021	$	—	$	(1,230	)	$	88,791
Mortgage-backed securities		107,874		205		(4,099	)		103,980		113,184		248		(2,806	)		110,626
Corporate debt securities		5,029		—		(84	)		4,945		5,034		12		(45	)		5,001
Mutual funds		587		—		—			587		672		—		(73	)		599
Total available for sale securities	$	203,507	$	205	$	(5,777	)	$	197,935	$	208,911	$	260	$	(4,154	)	$	205,017
Held to maturity securities
U.S. GSE obligations	$	32,572	$	—	$	(326	)	$	32,246	$	32,572	$	—	$	(166	)	$	32,406
Mortgage-backed securities		146,316		11		(2,411	)		143,916		117,155		7		(906	)		116,256
Corporate debt securities		6,966		—		(104	)		6,862		1,998		4		—			2,002
Municipal securities		78,555		1,383		(530	)		79,408		80,463		2,544		(117	)		82,890
Total held to maturity securities	$	264,409	$	1,394	$	(3,371	)	$	262,432	$	232,188	$	2,555	$	(1,189	)	$	233,554
Total	$	467,916	$	1,599	$	(9,148	)	$	460,367	$	441,099	$	2,815	$	(5,343	)	$	438,571

All of the Company’s mortgage-backed securities have been issued by, or are collateralized by securities issued by, either Government National Mortgage Association (Ginnie Mae), Federal National Mortgage Association (Fannie Mae), or Federal Home Loan Mortgage Corporation (Freddie Mac).

The following tables show the Company’s securities with gross unrealized losses aggregated by investment category and length of time that individual securities have been in a continuous loss position:

	March 31, 2018
	Less than 12 months					12 months or longer					Total
	Fair Value		Unrealized Losses			Fair Value		Unrealized Losses			Fair Value		Unrealized Losses
	(dollars in thousands)
Temporarily Impaired Securities
Available for sale securities
U.S. GSE obligations	$	—	$	—		$	88,423	$	(1,594	)	$	88,423	$	(1,594	)
Mortgage-backed securities		11,765		(360	)		89,052		(3,739	)		100,817		(4,099	)
Corporate debt securities		998		(2	)		3,947		(82	)		4,945		(84	)
Total available for sale securities	$	12,763	$	(362	)	$	181,422	$	(5,415	)	$	194,185	$	(5,777	)
Held to maturity securities
U.S. GSE obligations	$	32,246	$	(326	)	$	—	$	—		$	32,246	$	(326	)
Mortgage-backed securities		129,538		(2,375	)		3,778		(36	)		133,316		(2,411	)
Corporate debt securities		6,862		(104	)		—		—			6,862		(104	)
Municipal securities		14,218		(236	)		6,257		(294	)		20,475		(530	)
Total held to maturity securities	$	182,864	$	(3,041	)	$	10,035	$	(330	)	$	192,899	$	(3,371	)
Total temporarily impaired securities	$	195,627	$	(3,403	)	$	191,457	$	(5,745	)	$	387,084	$	(9,148	)

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	December 31, 2017
	Less than 12 months					12 months or longer					Total
	Fair Value		Unrealized Losses			Fair Value		Unrealized Losses			Fair Value		Unrealized Losses
	(dollars in thousands)
Temporarily Impaired Securities
Available for sale securities
U.S. GSE obligations	$	4,979	$	(21	)	$	83,812	$	(1,209	)	$	88,791	$	(1,230	)
Mortgage-backed securities		12,526		(157	)		94,663		(2,649	)		107,189		(2,806	)
Corporate debt securities		—		—			3,990		(45	)		3,990		(45	)
Mutual funds		—		—			599		(73	)		599		(73	)
Total available for sale securities	$	17,505	$	(178	)	$	183,064	$	(3,976	)	$	200,569	$	(4,154	)
Held to maturity securities
U.S. GSE obligations	$	27,407	$	(166	)	$	—	$	—		$	27,407	$	(166	)
Mortgage-backed securities		115,926		(906	)		3		—			115,929		(906	)
Corporate debt securities		—		—			—		—			—		—
Municipal securities		2,041		(19	)		6,459		(98	)		8,500		(117	)
Total held to maturity securities	$	145,374	$	(1,091	)	$	6,462	$	(98	)	$	151,836	$	(1,189	)
Total temporarily impaired securities	$	162,879	$	(1,269	)	$	189,526	$	(4,074	)	$	352,405	$	(5,343	)

Management evaluates securities for other-than-temporary impairment on at least a quarterly basis, and more frequently, when economic or market conditions warrant such evaluation. Consideration is given to: (1) the length of time and the extent to which the fair value has been less than cost; (2) the financial condition and near-term prospects of the issuer; and (3) the intent and ability of the Company to retain its investment in the issuer for a period of time sufficient to allow for any anticipated recovery in fair value.

As of March 31, 2018, 151 debt securities had gross unrealized losses, with an aggregate depreciation of 2.31% from the Company’s amortized cost basis. The largest unrealized loss percentage of any single security was 9.25%, or $46,000 of its amortized cost. The largest unrealized dollar loss of any single security was $237,000, or 4.74% of its amortized cost.

As of December 31, 2017, 118 debt securities and one equity security had gross unrealized losses, with an aggregate depreciation of 1.49% from the Company’s amortized cost basis. The largest unrealized loss percentage of any single security was 10.90%, or $73,000 of its amortized cost. The largest unrealized dollar loss of any single security was $185,000, or 3.71% of its amortized cost.  

The Company believes that the nature and duration of impairment on its debt security positions are primarily a function of interest rate movements and changes in investment spreads, and does not consider full repayment of principal on the reported debt obligations to be at risk. Since nearly all of these securities are rated “investment grade” and (a) the Company does not intend to sell these securities before recovery and (b) that it is more likely than not that the Company will not be required to sell these securities before recovery, the Company does not consider these securities to be other-than-temporarily impaired as of March 31, 2018 and December 31, 2017.

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The amortized cost and fair value of debt securities, aggregated by the earlier of guaranteed call date or contractual maturity, are shown below. Maturities of mortgage-backed securities do not take into consideration scheduled amortization or prepayments. 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.

	Within One Year				After One, But Within Five Years				After Five, But Within Ten Years				After Ten Years				Total
	Amortized Cost		Fair Value		Amortized Cost		Fair Value		Amortized Cost		Fair Value		Amortized Cost		Fair Value		Amortized Cost		Fair Value
At March 31, 2018	(dollars in thousands)
Available for sale securities
U.S. GSE obligations	$	20,017	$	19,897	$	70,000	$	68,526	$	—	$	—	$	—	$	—	$	90,017	$	88,423
Mortgage-backed securities		40		40		116		120		38,868		37,492		68,850		66,328		107,874		103,980
Corporate debt securities		—		—		5,029		4,945		—		—		—		—		5,029		4,945
Total available for sale    securities	$	20,057	$	19,937	$	75,145	$	73,591	$	38,868	$	37,492	$	68,850	$	66,328	$	202,920	$	197,348
Held to maturity securities
U.S. GSE obligations	$	5,004	$	4,970	$	27,568	$	27,276	$	—	$	—	$	—	$	—	$	32,572	$	32,246
Mortgage-backed securities		3		3		190		192		34,891		34,384		111,232		109,337		146,316		143,916
Corporate debt securities		—		—		6,966		6,862		—		—		—		—		6,966		6,862
Municipal securities		4,326		4,364		12,611		12,835		35,076		35,604		26,542		26,605		78,555		79,408
Total held to maturity    securities	$	9,333	$	9,337	$	47,335	$	47,165	$	69,967	$	69,988	$	137,774	$	135,942	$	264,409	$	262,432
Total	$	29,390	$	29,274	$	122,480	$	120,756	$	108,835	$	107,480	$	206,624	$	202,270	$	467,329	$	459,780

The following table sets forth information regarding sales of investment securities and the resulting gains (losses) from such sales:

	Three Months Ended March 31,
	2018		2017
	(dollars in thousands)
Amortized cost of securities sold	$	—	$	32,703
Gain/(loss) realized on securities sold		—		(2	)
Net proceeds from securities sold	$	—	$	32,701

7. LOANS AND THE ALLOWANCE FOR LOAN LOSSES

The Company’s lending activities are conducted principally in Eastern Massachusetts. The Company grants single- and multi-family residential loans, commercial & industrial (“C&I”), commercial real estate (“CRE”), construction loans, and a variety of consumer loans.  Most of the loans granted by the Company are secured by real estate collateral. Repayment of the Company’s residential loans are generally dependent on the health of the employment market in the borrowers’ geographic areas and that of the general economy with liquidation of the underlying real estate collateral being typically viewed as the primary source of repayment in the event of borrower default. The repayment of C&I loans depends primarily on the cash flow and credit worthiness of the borrower and secondarily on the underlying collateral provided by the borrower.  As borrower cash flow may be difficult to predict, liquidation of the underlying collateral securing these loans is typically viewed as the primary source of repayment in the event of borrower default.  However, collateral typically consists of equipment, inventory, accounts receivable, or other business assets that may fluctuate in value, so the liquidation of collateral in the event of default is often an insufficient source of repayment. The Company’s CRE loans are primarily made based on the cash flow from the collateral property and secondarily on the underlying collateral provided by the borrower, with liquidation of the underlying real estate collateral typically being viewed as the primary source of repayment in the event of borrower default. The Company’s construction loans are primarily made based on the borrower’s expected ability to execute and the future completed value of the collateral property, with sale of the underlying real estate collateral typically being viewed as the primary source of repayment.

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Loans outstanding are detailed by category as follows:

	March 31, 2018		December 31, 2017
	(dollars in thousands)
Residential mortgage
Mortgages - fixed rate	$	299,182	$	298,851
Mortgages - adjustable rate		241,330		239,027
Deferred costs net of unearned fees		1,087		1,042
Total residential mortgages		541,599		538,920
Commercial mortgage
Mortgages - nonowner occupied		584,414		562,203
Mortgages - owner occupied		40,050		35,343
Construction		31,585		35,904
Deferred costs net of unearned fees		240		199
Total commercial mortgages		656,289		633,649
Home equity
Home equity - lines of credit		66,889		70,326
Home equity - term loans		4,452		3,863
Deferred costs net of unearned fees		251		255
Total home equity		71,592		74,444
Commercial & industrial
Commercial & industrial		75,354		65,305
Deferred costs (fees) net of unearned fees		11		(10	)
Total commercial & industrial		75,365		65,295
Consumer
Secured		35,705		37,272
Unsecured		1,188		1,303
Deferred costs net of unearned fees		16		16
Total consumer		36,909		38,591
Total loans	$	1,381,754	$	1,350,899

Directors and officers of the Company and their associates are customers of, and have other transactions with, the Company in the normal course of business. All loans and commitments included in such transactions were made on substantially the same terms, including interest rates and collateral, as those prevailing at the time for comparable transactions with other persons and do not involve more than normal risk of collection or present other unfavorable features.

At March 31, 2018 and December 31, 2017, total loans outstanding to such directors and officers were $429,000 and $516,000, respectively. During the three months ended March 31, 2018, $6,000 of additions and $93,000 of repayments were made to these loans. There were $124,000 of additions and $298,000 of repayments during the year ended December 31, 2017. At March 31, 2018 and December 31, 2017, all of the loans to directors and officers were performing according to their original terms.

The following tables set forth information regarding non-performing loans disaggregated by loan category:

	March 31, 2018
	Residential Mortgages		Commercial Mortgages		Home Equity		Commercial & Industrial		Consumer		Total
	(dollars in thousands)
Non-performing loans:
Non-accrual loans	$	1,177	$	213	$	15	$	—	$	—	$	1,405
Loans past due >90 days, but still accruing		—		—		—		—		—		—
Troubled debt restructurings		119		—		—		23		—		142
Total	$	1,296	$	213	$	15	$	23	$	—	$	1,547

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	December 31, 2017
	Residential Mortgages		Commercial Mortgages		Home Equity		Commercial & Industrial		Consumer		Total
	(dollars in thousands)
Non-performing loans:
Non-accrual loans	$	918	$	213	$	17	$	—	$	—	$	1,148
Loans past due >90 days, but still accruing		—		—		—		—		—		—
Troubled debt restructurings		121		—		—		29		—		150
Total	$	1,039	$	213	$	17	$	29	$	—	$	1,298

Troubled Debt Restructurings (“TDRs”)

Loans are considered restructured in a troubled debt restructuring when the Company has granted concessions to a borrower due to the borrower’s financial condition that it otherwise would not have considered. These concessions may include modifications of the terms of the debt such as deferral of payments, extension of maturity, reduction of principal balance, reduction of the stated interest rate other than normal market rate adjustments, or a combination of these concessions. Debt may be bifurcated with separate terms for each tranche of the restructured debt. Restructuring a loan in lieu of aggressively enforcing the collection of the loan may benefit the Company by increasing the ultimate probability of collection.

Restructured loans are classified as accruing or non-accruing based on management’s assessment of the collectability of the loan. Loans which are already on nonaccrual status at the time of the restructuring generally remain on nonaccrual status for approximately six months or longer before management considers such loans for return to accruing status. Accruing restructured loans are placed into nonaccrual status if and when the borrower fails to comply with the restructured terms and management deems it unlikely that the borrower will return to a status of compliance in the near term.

Troubled debt restructurings are classified as impaired loans. The Company identifies loss allocations for impaired loans on an individual loan basis.

There were no new TDRs during the three months ended March 31, 2018. At March 31, 2018, three loans were determined to be TDRs with a total carrying value of $142,000. There were no TDR defaults during the three months ended March 31, 2018.

During the year ended December 31, 2017, the Company modified one loan with a pre-modification carrying value (which consists of the unpaid principal balance, net of charge-offs and unamortized deferred loan origination fees and costs, at the time of the restructuring) of $65,000 and a post-modification carrying value of $48,000. At December 31, 2017, this loan had a carrying value of $29,000. At December 31, 2017, three loans were determined to be TDRs with a total carrying value of $150,000. Two loans designated as TDRs were charged-off during the fourth quarter of 2017.  There were no TDR defaults during the year ended December 31, 2017.

There were no specific allowances for TDRs at March 31, 2018 and December 31, 2017.

As of March 31, 2018, there were no significant commitments to lend additional funds to borrowers whose loans were restructured.

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Loans by Credit Quality Indicator.  The following tables contain period-end balances of loans receivable disaggregated by credit quality indicator:

	March 31, 2018
	Residential Mortgages		Home Equity		Consumer
	(dollars in thousands)
Credit risk profile based on payment activity:
Performing	$	540,303	$	71,577	$	36,909
Non-performing		1,296		15		—
Total	$	541,599	$	71,592	$	36,909
			Commercial Mortgages		Commercial & Industrial
Credit risk profile by internally assigned grade:
1-6 (Pass)			$	651,366	$	67,033
7 (Special Mention)				4,710		7,991
8 (Substandard)				213		341
9 (Doubtful)				—		—
10 (Loss)				—		—
Total			$	656,289	$	75,365

	December 31, 2017
	Residential Mortgages		Home Equity		Consumer
	(dollars in thousands)
Credit risk profile based on payment activity:
Performing	$	537,881	$	74,427	$	38,591
Non-performing		1,039		17		—
Total	$	538,920	$	74,444	$	38,591
			Commercial Mortgages		Commercial & Industrial
Credit risk profile by internally assigned grade:
1-6 (Pass)			$	629,852	$	56,755
7 (Special Mention)				3,584		8,126
8 (Substandard)				213		414
9 (Doubtful)				—		—
10 (Loss)				—		—
Total			$	633,649	$	65,295

With respect to residential mortgages, home equity, and consumer loans, the Bank utilizes the following categories as indicators of credit quality:

• Performing – These loans are accruing and are considered having low to moderate risk.

• Non-performing – These loans either have been placed on non-accrual, or are past due more than 90 days but are still accruing, and may contain greater than average risk.

With respect to commercial real estate mortgages and commercial loans, the Bank utilizes a 10 grade internal loan rating system as an indicator of credit quality. The grades are as follows:

• Loans rated 1-6 (Pass) – These loans are considered “pass” rated with low to moderate risk.

• Loans rated 7 (Special Mention) – These loans have potential weaknesses warranting close attention, which, if left uncorrected, may result in deterioration of the credit at some future date.

• Loans rated 8 (Substandard) – These loans have well-defined weaknesses that jeopardize the orderly liquidation of the debt under the original loan terms. Loss potential exists but is not identifiable in any one customer.

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• Loans rated 9 (Doubtful) – These loans have pronounced weaknesses that make full collection highly questionable and improbable.

• Loans rated 10 (Loss) – These loans are considered uncollectible and continuance as a bankable asset is not warranted.

Delinquencies

The past due status of a loan is determined in accordance with its contractual repayment terms. All loan types are reported past due when one scheduled payment is due and unpaid for 30 days or more. Loan delinquencies can be attributed to many factors, such as but not limited to a continuing weakness in, or deteriorating economic conditions in, the region in which the collateral is located, the loss of a tenant or lower lease rates for commercial borrowers, or the loss of income for consumers and the resulting liquidity impacts on the borrowers.

The following tables contain period-end balances of loans receivable disaggregated by past due status:

	March 31, 2018
	30-59 Days Past Due		60-89 Days Past Due		90 Days or Greater		Total Past Due		Current Loans		Total
	(dollars in thousands)
Residential Mortgages	$	1,908	$	423	$	686	$	3,017	$	538,582	$	541,599
Commercial Mortgages		—		—		213		213		656,076		656,289
Home Equity		44		—		—		44		71,548		71,592
Commercial & Industrial		25		—		—		25		75,340		75,365
Consumer loans		3		12		—		15		36,894		36,909
Total	$	1,980	$	435	$	899	$	3,314	$	1,378,440	$	1,381,754

	December 31, 2017
	30-59 Days Past Due		60-89 Days Past Due		90 Days or Greater		Total Past Due		Current Loans		Total
	(dollars in thousands)
Residential Mortgages	$	1,353	$	706	$	64	$	2,123	$	536,797	$	538,920
Commercial Mortgages		—		32		—		32		633,617		633,649
Home Equity		1		—		17		18		74,426		74,444
Commercial & Industrial		—		—		—		—		65,295		65,295
Consumer loans		176		—		—		176		38,415		38,591
Total	$	1,530	$	738	$	81	$	2,349	$	1,348,550	$	1,350,899

There were no significant commitments to lend additional funds to borrowers whose loans were on nonaccrual status at March 31, 2018 and December 31, 2017.

Foreclosure proceedings

As of March 31, 2018 and December 31, 2017, loans secured by one- to four-family residential property amounting to $63,000 and $64,000, respectively, were in process of foreclosure.

Impaired Loans

Impaired loans are loans for which it is probable that the Company will not be able to collect all amounts due according to the contractual terms of the loan agreements and loans restructured in a troubled debt restructuring. The recorded investment in impaired loans consists of unpaid principal balance, net of charge-offs, interest payments received applied to principal and unamortized deferred loan origination fees and costs.  

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The following tables present information pertaining to impaired loans:

	For the Three Months Ended March 31, 2018
	Carrying Value		Average Carrying Value		Unpaid Principal Balance		Related Allowance		Interest Income Recognized
	(dollars in thousands)
With no required reserve recorded:
Commercial and industrial	$	23	$	25	$	23	$	—	$	—
Commercial mortgage		213		213		227		—		—
Residential mortgage		1,157		1,164		1,360		—		—
Home equity		68		69		99		—		—
Total		1,461		1,471		1,709		—		—
With required reserve recorded:
Commercial and industrial		—		—		—		—		—
Commercial mortgage		—		—		—		—		—
Residential mortgage		63		63		63		90		—
Home equity		—		—		—		—		—
Total		63		63		63		90		—
Total:
Commercial and industrial		23		25		23		—		—
Commercial mortgage		213		213		227		—		—
Residential mortgage		1,220		1,227		1,423		90		—
Home equity		68		69		99		—		—
Total	$	1,524	$	1,534	$	1,772	$	90	$	—

	For the Three Months Ended March 31, 2017
	Carrying Value		Average Carrying Value		Unpaid Principal Balance		Related Allowance		Interest Income Recognized
	(dollars in thousands)
With no required reserve recorded:
Commercial and industrial	$	—	$	—	$	—	$	—	$	—
Commercial mortgage		232		232		232		—		—
Residential mortgage		693		701		874		—
Home equity		100		101		126		—		—
Consumer		—		—		—		—		—
Total		1,025		1,034		1,232		—		—
With required reserve recorded:
Commercial and industrial		283		285		291		108		—
Commercial mortgage		—		—		—		—		—
Residential mortgage		315		317		315		200		—
Home equity		—		—		—		—		—
Total		598		602		606		308		—
Total:
Commercial and industrial		283		285		291		108		—
Commercial mortgage		232		232		232		—		—
Residential mortgage		1,008		1,018		1,189		200		—
Home equity		100		101		126		—		—
Consumer		—		—		—		—		—
Total	$	1,623	$	1,636	$	1,838	$	308	$	—

Allowance for Loan Losses  

The Company maintains an allowance for loan losses in an amount determined by management on the basis of the character of the loans, loan performance, financial condition of borrowers, the value of collateral securing loans, and other relevant factors. We provide for loan losses based upon the consistent application of our documented allowance for loan loss methodology. All loan losses

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are charged to the allowance for loan losses and all recoveries are credited to it. Additions to the allowance for loan losses are provided by charges to income based on various factors which, in our judgment, deserve current recognition in estimating probable losses. We regularly review the loan portfolio, including a review of our classified assets, and make provisions for loan losses in order to maintain the allowance for loan losses in accordance with GAAP. The allowance for loan losses consists primarily of two components:

1. Specific allowances established for impaired loans, as defined by GAAP. The amount of impairment provided for as a specific allowance is measured based on the deficiency, if any, between the present value of expected future cash flows discounted at the loan’s effective interest rate at the time of impairment or, as a practical expedient, at the loan’s observable market price, or the fair value of the collateral if the loan is collateral-dependent, and the carrying value of the loan; and

2. General allowances established for loan losses on a portfolio basis for loans that do not meet the definition of impaired loans. The portfolio is grouped into homogenous pools by similar risk characteristics, primarily by loan type and regulatory classification. We apply an estimated incurred loss rate to each loan group. The loss rates applied are based upon our historical loss experience over a designated look back period adjusted, as appropriate, for the quantitative, qualitative, and environmental factors discussed below. This evaluation is inherently subjective, as it requires material estimates that may be susceptible to significant revisions based upon changes in economic and real estate market conditions.

Actual loan losses may be significantly more than the allowance for loan losses we have established, which could have a material negative effect on our financial results.

The adjustments to historical loss experience are based on our evaluation of several quantitative, qualitative, and environmental factors, including:

• the loss emergence period, which represents the average amount of time between when loss events occur for specific loan types and when such problem loans are identified and the related loss amounts are confirmed through charge-offs;

• changes in any concentration of credit (including, but not limited to, concentrations by geography, industry, or collateral type);

• changes in the number and amount of non-accrual loans and past due loans;

• changes in national, state, and local economic trends;

• changes in the types of loans in the loan portfolio;

• changes in the experience and ability of personnel;

• changes in lending strategies; and

• changes in lending policies and procedures.

In addition, we may establish an unallocated allowance to provide for probable losses that have been incurred as of the reporting date but are not reflected in the allocated allowance.

We evaluate the allowance for loan losses based upon the combined total of the specific and general components. Generally, when the loan portfolio increases, absent other factors, the allowance for loan loss methodology results in a higher dollar amount of estimated probable losses than would be the case without the increase. Generally, when the loan portfolio decreases, absent other factors, the allowance for loan losses methodology results in a lower dollar amount of estimated probable losses than would be the case without the decrease. Periodically, management conducts an analysis to estimate the loss emergence period for various loan categories based on samples of historical charge-offs. Model output by loan category is reviewed to evaluate the reasonableness of the reserve levels in comparison to the estimated loss emergence period applied to historical loss experience.

We evaluate the loan portfolio on a quarterly basis, and the allowance is adjusted accordingly. While we use the best information available to make evaluations, future adjustments to the allowance may be necessary if conditions differ substantially from the information used in making the evaluations. In addition, various regulatory agencies, as an integral part of their examination process, will periodically review the allowance for loan losses. Such agencies may require us to recognize additions to the allowance based on their analysis of information available to them at the time of their examination.

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The following tables contain changes in the allowance for loan losses disaggregated by loan category:

	For the Three Months Ended March 31, 2018
	Residential Mortgages			Commercial Mortgages		Home Equity			Commercial & Industrial			Consumer			Impaired			Total
	(dollars in thousands)
Allowance for loan losses:
Balance at December 31, 2017	$	5,047		$	8,289	$	630		$	946		$	315		$	93		$	15,320
Charge-offs		—			—		—			(5	)		(5	)		—			(10	)
Recoveries		—			—		—			11			2			—			13
Provision		(355	)		648		(60	)		193			(14	)		(3	)		409
Balance at March 31, 2018	$	4,692		$	8,937	$	570		$	1,145		$	298		$	90		$	15,732

	For the Three Months Ended March 31, 2017
	Residential Mortgages			Commercial Mortgages		Home Equity			Commercial & Industrial			Consumer			Impaired		Total
	(dollars in thousands)
Allowance for loan losses:
Balance at December 31, 2016	$	4,898		$	8,451	$	651		$	807		$	264		$	190	$	15,261
Charge-offs		—			—		—			—			(7	)		—		(7	)
Recoveries		—			—		—			3			2			—		5
Provision		(86	)		175		(35	)		(152	)		10			118		30
Balance at March 31, 2017	$	4,812		$	8,626	$	616		$	658		$	269		$	308	$	15,289

The following tables contain period-end balances of the allowance for loan losses and related loans receivable disaggregated by impairment method:

	March 31, 2018
	Residential Mortgages		Commercial Mortgages		Home Equity		Commercial & Industrial		Consumer		Total
	(dollars in thousands)
Allowance for loan losses
Individually evaluated for impairment	$	90	$	—	$	—	$	—	$	—	$	90
Collectively evaluated for impairment		4,692		8,937		570		1,145		298		15,642
Total	$	4,782	$	8,937	$	570	$	1,145	$	298	$	15,732
Loans receivable
Individually evaluated for impairment	$	1,220	$	213	$	68	$	23	$	—	$	1,524
Collectively evaluated for impairment		540,379		656,076		71,524		75,342		36,909		1,380,230
Total	$	541,599	$	656,289	$	71,592	$	75,365	$	36,909	$	1,381,754

	December 31, 2017
	Residential Mortgages		Commercial Mortgages		Home Equity		Commercial & Industrial		Consumer		Total
	(dollars in thousands)
Allowance for loan losses
Individually evaluated for impairment	$	93	$	—	$	—	$	—	$	—	$	93
Collectively evaluated for impairment		5,047		8,289		630		946		315		15,227
Total	$	5,140	$	8,289	$	630	$	946	$	315	$	15,320
Loans receivable
Individually evaluated for impairment	$	968	$	213	$	86	$	29	$	—	$	1,296
Collectively evaluated for impairment		537,952		633,436		74,358		65,266		38,591		1,349,603
Total	$	538,920	$	633,649	$	74,444	$	65,295	$	38,591	$	1,350,899

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8. Income Taxes

In accordance with the Tax Cuts and Jobs Act of 2017, the Company’s federal tax rate reduced from 35% to 21% effective January 1, 2018. The effective tax rate was 21.8% for the quarter ended March 31, 2018, as compared to 31.4% for the quarter ended March 31, 2017.

Net deferred tax assets totaled $7.9 million at March 31, 2018 and $8.3 million at December 31, 2017. The Company recorded no valuation allowance for deferred tax assets at March 31, 2018.

The components of income tax expense were as follows:

	Three Months Ended March 31,
	2018		2017
	(dollars in thousands)
Current
Federal	$	593	$	932
State		253		234
Total current expense		846		1,166
Deferred
Federal		524		637
State		246		181
Total deferred		770		818
Total income tax expense	$	1,616	$	1,984

9. Pension and Retirement Plans

The components of net periodic benefit cost (credit) were as follows:

	Three Months Ended March 31,
	Pension Plan						Supplemental Retirement Plan				Retirement Healthcare Plan
	2018			2017			2018		2017		2018		2017
	(dollars in thousands)
Net periodic benefit cost
Service cost	$	—		$	447		$	89	$	67	$	6	$	4
Interest cost		386			545			77		91		5		5
Expected return on assets		(723	)		(818	)		—		—		—		—
Amortization of prior service cost (credit)		(1	)		(1	)		—		—		—		—
Amortization of net actuarial loss		16			237			1		—		5		(2	)
Net periodic benefit cost (credit)	$	(322	)	$	410		$	167	$	158	$	16	$	7

The Company made no contributions to the qualified defined benefit pension plan during the three months ended March 31, 2018. We do not expect to make any contributions to the qualified defined benefit plan during the remainder of 2018.

The Company adopted Accounting Standards Update No. 2017-07 - Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost (“ASU 2017-07”) on January 1, 2018.  ASU 2017-07 requires that an employer report the service cost component in the same line item or items as other compensation costs arising from services rendered by the pertinent employees during the period and all other components of net periodic benefit cost in a separate line item(s) on the consolidated statements of income. The components of net periodic pension cost other than the service cost components are included in other expenses.  

Employee Profit Sharing Plan

The Company maintains a Profit Sharing Plan (“PSP”) that provides for deferral of federal and state income taxes on employee contributions allowed under Section 401(k) of federal law. The PSP plan was amended effective January 1, 2018.  The Company matches employee contributions up to 100% of the first 4% of each participant’s salary, up from 3% in 2017.  Each year, the Company may also make a discretionary contribution to the PSP. It is anticipated that the Company will make a discretionary contribution to the

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Plan of 4% of eligible compensation for plan participants. Employees are eligible to participate in the PSP on the first day of their initial date of service.  Additionally, employees will be eligible to participate in the discretionary contribution portion of the PSP if employed by the Company on the last day of the plan year.

Employee Stock Ownership Plan

The Company has an Employee Stock Ownership Plan (“ESOP”) for its eligible employees. Employees are eligible to participate upon the attainment of age 21 and the completion of 12 months of service consisting of at least 1,000 hours. The Company may make a discretionary contribution to the ESOP on an annual basis.  Shares of the Company’s common stock can then be purchased and allocated to eligible participant accounts at the then quoted market price.  Participants can elect to have cash dividends paid during the year re-invested to purchase additional shares.  

Total expenses related to the PSP and ESOP for the three months ended March 31, 2018 and March 31, 2017 amounted to approximately $823,000 and $238,000, respectively.

10. STOCK BASED COMPENSATION

Time Vested Restricted Stock Awards (RSAs) and Restricted Stock Units (RSUs)

During the three months ended March 31, 2018, the Company issued the following RSAs and RSUs from the 2017 Equity and Cash Incentive Plan.  The fair value of RSAs and RSUs is based upon the Company’s common stock closing share price on the date of the grant. The holders of RSAs participate fully in the rewards of stock ownership of the Company, including voting and dividend rights.

		Weighted-
		Average
Shares Granted		Fair Value at Grant Date		Type of Award
	11,838	$	76.71	RSAs
	7,839	$	76.56	RSUs

Performance-Based Restricted Stock Units

On January 22, 2018, the Company granted 23,511 performance-based restricted stock units. These performance-based restricted stock units were issued from the 2017 Equity and Cash Incentive Plan and had a grant date fair value per share of $76.56, as determined by the closing price on grant date. Performance-based restricted stock units are subject to a 3-year performance period and will be earned based on Return on Assets and diluted Earnings Per Share growth performance as compared to the Company’s peer group.  

The following table presents the pre-tax expense associated with all outstanding non-vested RSAs, RSUs, performance based restricted stock units, and the related tax benefits recognized:

	Three Months Ended March 31,
	2018		2017
	(dollars in thousands)
Stock based compensation expense	$	540	$	273
Related tax benefits	$	152	$	112

11. Financial Instruments with Off-Balance-Sheet Risk

To meet the financing needs of its customers, the Company is a party to financial instruments with off-balance-sheet risk in the normal course of business. These financial instruments are primarily comprised of commitments to extend credit, commitments to sell residential mortgage loans, derivatives contracts, risk participation agreements, and standby letters of credit. Those instruments involve, to varying degrees, elements of credit and interest rate risk in excess of the amounts recognized in the consolidated balance sheets.

The Company’s exposure to credit loss in the event of nonperformance by the other party to the financial instrument for loan commitments and standby letters of credit is represented by the contractual amount of those instruments assuming that the amounts are fully advanced and that collateral, or other security, is of no value. The Company uses the same credit policies in making commitments and conditional obligations as it does for on-balance-sheet instruments.

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Off-balance-sheet financial instruments with contractual amounts that present credit risk include the following:

	March 31, 2018		December 31, 2017
	(dollars in thousands)
Financial instruments whose contractual amount    represents credit risk:
Commitments to extend credit:
Unused portion of existing lines of credit	$	313,313	$	304,298
Origination of new loans		34,392		45,061
Standby letters of credit		8,669		8,322
Financial instruments whose notional amount exceeds    the amount of credit risk:
Commitments to sell residential mortgage loans		1,124		1,490
Customer related derivative contracts:
Interest rate swaps with customers		78,967		74,758
Mirror swaps with counterparties		78,967		74,758
Risk participation agreements with counterparties		39,095		38,494

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12. Shareholders’ Equity

As of March 31, 2018 and December 31, 2017, the Company and the Bank met all applicable minimum capital requirements and were considered “well-capitalized” by both the FRB and the FDIC.  

	Actual					Minimum Capital Required For Capital Adequacy					Minimum Capital Required For Capital Adequacy Plus Capital Conservation Buffer Basel III Phase-In Schedule					Minimum Capital Required For Capital Adequacy Plus Capital Conservation Buffer Basel III Fully Phased In					Minimum To Be Well-Capitalized Under Prompt Corrective Action Provisions
	Amount		Ratio			Amount		Ratio			Amount		Ratio			Amount		Ratio			Amount		Ratio
	(dollars in thousands)
At March 31, 2018
Cambridge Bancorp:
Total capital (to risk-weighted    assets)	$	174,684		13.9	%	$	100,692		8.0	%	$	124,292		9.875	%	$	132,159		10.5	%	N/A		N/A
Tier I capital (to risk-weighted    assets)		158,950		12.6	%		75,519		6.0	%		99,119		7.875	%		106,986		8.5	%	N/A		N/A
Common equity tier I capital    (to risk-weighted assets)		158,950		12.6	%		56,639		4.5	%		80,239		6.375	%		88,106		7.0	%	N/A		N/A
Tier I capital (to average    assets)		158,950		8.1	%		78,043		4.0	%		78,043		4.000	%		78,043		4.0	%	N/A		N/A
Cambridge Trust Company:
Total capital (to risk-weighted    assets)	$	170,546		13.5	%	$	100,692		8.0	%	$	124,292		9.875	%	$	132,159		10.5	%	$	125,866		10.0	%
Tier I capital (to risk-weighted    assets)		154,812		12.3	%		75,519		6.0	%		99,119		7.875	%		106,986		8.5	%		100,692		8.0	%
Common equity tier I capital    (to risk-weighted assets)		154,812		12.3	%		56,639		4.5	%		80,239		6.375	%		88,106		7.0	%		81,813		6.5	%
Tier I capital (to average    assets)		154,812		7.9	%		78,043		4.0	%		78,043		4.000	%		78,043		4.0	%		97,554		5.0	%
At December 31, 2017
Cambridge Bancorp:
Total capital (to risk-weighted    assets)	$	168,615		13.7	%	$	98,136		8.0	%	$	113,470		9.25	%	$	128,804		10.5	%	N/A		N/A
Tier I capital (to risk-weighted    assets)		153,281		12.5	%		73,602		6.0	%		88,936		7.25	%		104,270		8.5	%	N/A		N/A
Common equity tier I capital    (to risk-weighted assets)		153,281		12.5	%		55,202		4.5	%		70,535		5.75	%		85,869		7.0	%	N/A		N/A
Tier I capital (to average    assets)		153,281		8.1	%		76,026		4.0	%		76,026		4.00	%		76,026		4.0	%	N/A		N/A
Cambridge Trust Company:
Total capital (to risk-weighted    assets)	$	164,880		13.4	%	$	98,136		8.0	%	$	113,470		9.25	%	$	128,804		10.5	%	$	122,670		10.0	%
Tier I capital (to risk-weighted    assets)		149,546		12.2	%		73,602		6.0	%		88,936		7.25	%		104,270		8.5	%		98,136		8.0	%
Common equity tier I capital    (to risk-weighted assets)		149,546		12.2	%		55,202		4.5	%		70,535		5.75	%		85,869		7.0	%		79,736		6.5	%
Tier I capital (to average    assets)		149,546		7.9	%		76,026		4.0	%		76,026		4.00	%		76,026		4.0	%		95,033		5.0	%

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13. Other Comprehensive Income

The following table presents the changes in accumulated other comprehensive income (loss) during the period, by component, net of tax:

	Three Months Ended March 31, 2018									Three Months Ended March 31, 2017
	Before Tax Amount			Tax (Expense) or Benefit			Net-of-tax Amount			Before Tax Amount		Tax (Expense) or Benefit			Net-of-tax Amount
	(dollars in thousands)
Unrealized gains/(losses) on available for sale securities
Unrealized holding gains/(losses) arising during period	$	(1,678	)	$	326		$	(1,352	)	$	292	$	(103	)	$	189
Reclassification adjustment for (gains)/losses recognized in net income		—			—			—			2		(1	)		1
Defined benefit retirement plans
Change in retirement liability		14			(4	)		10			224		(92	)		132
Total Other Comprehensive Income (Loss)	$	(1,664	)	$	322		$	(1,342	)	$	518	$	(196	)	$	322

Reclassifications out of Accumulated Other Comprehensive Income (“AOCI”) that have an impact on net income are presented below:

Three Months Ended March 31,
Details about Accumulated Other Comprehensive Income Components	2018		2017			Affected Line Item in the Statement where Net Income is Presented
	(dollars in thousands)
Unrealized gains and losses on available    for sale securities	$	—	$	(2	)	(Loss) gain on disposition of    investment securities
Tax benefit or (expense)		—		1		Provision for income taxes
Net of tax	$	—	$	(1	)	Net income

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14. Earnings per Share

The following represents a reconciliation between basic and diluted earnings per share:

	Three Months Ended March 31,
	2018			2017
	(dollars in thousands, except per share data)
Earnings per common share - basic:
Numerator:
Net income	$	5,805		$	4,328
Less dividends and undistributed earnings allocated    to participating securities		(64	)		(47	)
Net income applicable to common shareholders	$	5,741		$	4,281
Denominator:
Weighted average common shares outstanding		4,053			4,012
Earnings per common share - basic	$	1.42		$	1.07
Earnings per common share - diluted:
Numerator:
Net income	$	5,805		$	4,328
Less dividends and undistributed earnings allocated    to participating securities		(64	)		(47	)
Net income applicable to common shareholders	$	5,741		$	4,281
Denominator:
Weighted average common shares outstanding		4,053			4,012
Dilutive effect of common stock equivalents		19			39
Weighted average diluted common shares outstanding		4,072			4,051
Earnings per common share - diluted	$	1.41		$	1.06

15. Derivative Financial Instruments

The Company enters into interest rate derivatives to accommodate the business requirements of its customers. Derivatives are recognized as either assets or liabilities on the balance sheet and are measured at fair value.  The accounting for changes in the fair value of derivatives depends on the intended use of the derivative and resulting designation.

Interest Rate Swaps

The Company has entered into interest rate swap contracts to help commercial loan borrowers manage their interest rate risk. The interest rate swap contracts with commercial loan borrowers allow them to convert floating-rate loan payments to fixed-rate loan payments. When the Bank enters into an interest rate swap contract with a commercial loan borrower, it simultaneously enters into a “mirror” swap contract with a third party. The third party exchanges the client’s fixed‑rate loan payments for floating-rate loan payments. 

As of March 31, 2018 and December 31, 2017, the Bank had interest rate swap contracts with commercial loan borrowers with notional amounts of $79.0 million and $74.8 million, respectively, and equal amounts of “mirror” swap contracts with third-party financial institutions. These derivatives are not designated as hedges and therefore, changes in fair value are recognized in earnings. Because these derivatives have mirror-image contractual terms, the changes in fair value substantially offset each other through earnings. Fees earned in connection with the execution of derivatives related to this program are recognized in earnings through loan related derivative income.

The credit risk associated with swap transactions is the risk of default by the counterparty. To minimize this risk, the Company enters into interest rate agreements only with highly rated counterparties that management believes to be creditworthy. The notional amounts of these agreements do not represent amounts exchanged by the parties under a collateral pledging agreement, and, thus, are not a measure of the potential loss exposure.

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Risk Participation Agreements

The Company has entered into risk participation agreements (“RPAs”) with other banks participating in commercial loan arrangements. Participating banks guarantee the performance on borrower-related interest rate swap contracts. RPAs are derivative financial instruments and are recorded at fair value and reported in other assets or other liabilities. These derivatives are not designated as hedges, and therefore, changes in fair value are recognized in earnings with a corresponding offset within other liabilities.

Under a risk participation-out agreement (a derivative asset), the Company participates out a portion of the credit risk associated with the interest rate swap position executed with the commercial borrower for a fee paid to the participating bank. Under a risk participation-in agreement (a derivative liability), the Company assumes, or participates in, a portion of the credit risk associated with the interest rate swap position with the commercial borrower for a fee received from the other bank.

As of March 31, 2018, the notional amounts of the risk participation-in agreements and risk participation-out agreements were $39.1 million and $0, respectively.  As of December 31, 2017, the notional amounts of the risk participation-in agreements and risk participation-out agreements were $38.5 million and $0, respectively.

The following table presents the fair values of derivative instruments in the Company’s unaudited consolidated balance sheets:

		Derivative Assets					Derivative Liabilities
	Balance Sheet Location	March 31, 2018		December 31, 2017		Balance Sheet Location	March 31, 2018		December 31, 2017
		(dollars in thousands)					(dollars in thousands)
Derivatives not Designated as Hedging Instruments
Loan related derivative contracts
Interest rate swaps with customers	Other Assets	$	3,253	$	1,859	Other Liabilities	$	—	$	—
Mirror swaps with counterparties	Other Assets		—		—	Other Liabilities		3,253		1,859
Risk participation agreements	Other Assets		—		—	Other Liabilities		54		81
Total		$	3,253	$	1,859		$	3,307	$	1,940

For the three months ended March 31, 2018 and March 31, 2017, the Company recorded $472,000 and $188,000, respectively, of loan related derivative income.

16. Fair Value Measurements

The Company follows ASC 820, “Fair Value Measurements and Disclosures,” for financial assets and liabilities. ASC 820 defines fair value, establishes a framework for measuring fair value, and expands disclosure requirements about fair value measurements. ASC 820, among other things, emphasizes that fair value is a market-based measurement, not an entity-specific measurement, and states that a fair value measurement should be determined based on the assumptions the market participants would use in pricing the asset or liability. In addition, ASC 820 specifies a hierarchy of valuation techniques based on whether the types of valuation information (“inputs”) are observable or unobservable. Observable inputs reflect market data obtained from independent sources, while unobservable inputs reflect the Company’s market assumptions. These two types of inputs have created the following fair value hierarchy:

• Level 1 – Quoted prices for identical assets or liabilities in active markets.

• Level 2 – Quoted prices for similar assets or liabilities in active markets; quoted prices for identical or similar assets or liabilities in inactive markets; and model-derived valuations in which all significant inputs and significant value drivers are observable in active markets.

• Level 3 – Valuations derived from techniques in which one or more significant inputs or significant value drivers are unobservable in the markets and which reflect the Company’s market assumptions.

The Company uses fair value measurements to record fair value adjustments to certain assets and liabilities and to determine fair value disclosures. Securities available for sale, derivative instruments, and hedges are recorded at fair value on a recurring basis. Additionally, from time to time, the Company may be required to record at fair value other assets on a nonrecurring basis, such as collateral dependent impaired loans.

In accordance with the requirements of ASU 2016-01, the Company uses an exit price notion for its fair value disclosures as of March 31, 2018.

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The following is a summary of the carrying values and estimated fair values of the Company’s significant financial instruments as of the dates indicated:

	March 31, 2018				December 31, 2017
	Carrying Value		Estimated Fair Value		Carrying Value		Estimated Fair Value
	(dollars in thousands)
Financial assets
Cash and cash equivalents	$	56,265	$	56,265	$	103,591	$	103,591
Securities available for sale		197,935		197,935		205,017		205,017
Securities held to maturity		264,409		262,432		232,188		233,554
Loans, net		1,366,022		1,320,509		1,335,579		1,304,719
Loans held for sale		—		—		—		—
FHLB Boston stock		4,242		4,242		4,242		4,242
Bank owned life insurance		30,535		30,535		31,083		31,083
Accrued interest receivable		5,059		5,059		5,128		5,128
Mortgage servicing rights		760		1,049		793		1,049
Loan level interest rate swaps		3,253		3,253		1,859		1,859
Financial liabilities
Deposits		1,782,392		1,779,459		1,775,400		1,772,838
Short-term borrowings		—		—		—		—
Long-term borrowings		3,537		3,486		3,579		3,559
Loan level interest rate swaps		3,253		3,253		1,859		1,859
Risk participation agreements		54		54		81		81

The following tables summarize certain assets reported at fair value on a recurring basis:

	Fair Value as of March 31, 2018
	Level 1		Level 2		Level 3		Total
	(dollars in thousands)
Measured on a recurring basis
Securities available for sale
U.S. GSE obligations	$	—	$	88,423	$	—	$	88,423
Mortgage-backed securities		—		103,980		—		103,980
Corporate debt securities		—		4,945		—		4,945
Mutual funds		587		—		—		587
Other assets
Interest rate swaps with customers		—		3,253		—		3,253
Other liabilities
Mirror swaps with counterparties		—		3,253		—		3,253
Risk participation agreements		—		54		—		54

	Fair Value as of December 31, 2017
	Level 1		Level 2		Level 3		Total
	(dollars in thousands)
Measured on a recurring basis
Securities available for sale
U.S. GSE obligations	$	—	$	88,791	$	—	$	88,791
Mortgage-backed securities		—		110,626		—		110,626
Corporate debt securities		—		5,001		—		5,001
Mutual funds		599		—		—		599
Other assets
Interest rate swaps with customers		—		1,859		—		1,859
Other liabilities
Mirror swaps with counterparties		—		1,859		—		1,859
Risk participation agreements		—		81		—		81

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There were no assets measured at fair value on a non-recurring basis during the quarter ended March 31, 2018 and at December 31, 2017.

There were no transfers between levels for the three months ended March 31, 2018 and the three months ended March 31, 2017.  

The following is a description of the principal valuation methodologies used by the Company to estimate the fair values of its financial instruments.

Investment Securities

For investment securities, fair values are primarily based upon valuations obtained from a national pricing service which uses matrix pricing with inputs that are observable in the market or can be derived from, or corroborated by, observable market data. When available, quoted prices in active markets for identical securities are utilized.

Loans Held for Sale

For loans held for sale, fair values are estimated using projected future cash flows, discounted at rates based upon either trades of similar loans or mortgage-backed securities, or at current rates at which similar loans would be made to borrowers with similar credit ratings and for similar remaining maturities.

Loans

For most categories of loans, fair values are estimated using projected future cash flows, discounted at rates based upon current rates at which similar loans would be made to borrowers with similar credit ratings, and for similar remaining maturities. Projected estimated cash flows are adjusted for prepayment assumptions, liquidity premium assumptions, and credit loss assumptions. Loans that are deemed to be impaired in accordance with ASC 310, “Receivables,” are valued based upon the lower of cost or fair value of the underlying collateral.

FHLB of Boston Stock

The fair value of FHLB of Boston stock equals its carrying value since such stock is only redeemable at its par value.

Deposits

The fair value of non-maturity deposit accounts is the amount payable on demand at the reporting date. This amount does not take into account the value of the Bank’s long-term relationships with core depositors. The fair value of fixed-maturity certificates of deposit is estimated using a replacement cost of funds approach and is based upon rates currently offered for deposits of similar remaining maturities.

Long-Term Borrowings

For long-term borrowings, fair values are estimated using future cash flows, discounted at rates based upon current costs for debt securities with similar terms and remaining maturities.

Other Financial Assets and Liabilities

Cash and cash equivalents, accrued interest receivable, and short-term borrowings have fair values which approximate their respective carrying values because these instruments are payable on demand or have short-term maturities and present relatively low credit risk and interest rate risk.

Derivative Instruments and Hedges

The valuation of these instruments is determined using widely accepted valuation techniques including discounted cash flow analysis on the expected cash flows of each derivative. This analysis reflects the contractual terms of the derivatives, including the period to maturity, and uses observable market-based inputs, including interest rate curves and implied volatilities. The Bank incorporates credit valuation adjustments to appropriately reflect nonperformance risk in the fair value measurements. In adjusting the fair value of its

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derivative contracts for the effect of nonperformance risk, the Bank has considered the impact of netting and any applicable credit enhancements, such as collateral postings.

Off-Balance-Sheet Financial Instruments

In the course of originating loans and extending credit, the Bank will charge fees in exchange for its commitment. While these commitment fees have value, the Bank has not estimated their value due to the short-term nature of the underlying commitments and their immateriality.

Values Not Determined

In accordance with ASC 820, the Company has not estimated fair values for non-financial assets such as banking premises and equipment, goodwill, the intangible value of the Bank’s portfolio of loans serviced for itself, and the intangible value inherent in the Bank’s deposit relationships (i.e., core deposits), among others. Accordingly, the aggregate fair value amounts presented do not represent the underlying value of the Company.

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Item 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations.

The following analysis discusses the changes in financial condition and results of operation of Cambridge Bancorp (together with its bank subsidiary, unless the context otherwise requires, the “Company”) and should be read in conjunction with Company’s Annual Report on Form 10-K for the fiscal year ended December 31, 2017, filed with the Securities and Exchange Commission.

Forward-Looking Statements

This report contains forward-looking statements as defined in the Private Securities Litigation Reform Act of 1995. Such forward-looking statements about the Company and its industry involve substantial risks and uncertainties. Statements other than statements of current or historical fact, including statements regarding the Company’s future financial condition, results of operations, business plans, liquidity, cash flows, projected costs, and the impact of any laws or regulations applicable to the Company, are forward-looking statements. Words such as “anticipates,” “believes,” “estimates,” “expects,” “forecasts,” “intends,” “plans,” “projects,” “may,” “will,” “should,” and other similar expressions are intended to identify these forward-looking statements. Such statements are subject to factors that could cause actual results to differ materially from anticipated results. Such factors include, but are not limited to, the following:

• national, regional and local economic conditions may be less favorable than expected, resulting in, among other things, increased charge offs of loans, higher provisions for credit losses and/or reduced demand for the Company’s services;

• disruptions to the credit and financial markets, either nationally or globally;

• weakness in the real estate market, including the secondary residential mortgage market, which can affect, among other things, the value of collateral securing mortgage loans, mortgage loan originations and delinquencies, and profits on sales of mortgage loans;

• legislative, regulatory or accounting changes, including changes resulting from the adoption and implementation of the Dodd-Frank Act, which may adversely affect our business and/or competitive position, impose additional costs on the Company or cause us to change our business practices;

• the Dodd-Frank Act’s consumer protection regulations which could adversely affect the Company’s business, financial condition or results of operations;

• disruptions in the Company’s ability to access capital markets which may adversely affect its capital resources and liquidity;

• the Company’s heavy reliance on communications and information systems to conduct its business and reliance on third parties and affiliates to provide key components of its business infrastructure, any disruptions of which could interrupt the Company's operations or increase the costs of doing business;

• that the Company’s financial reporting controls and procedures may not prevent or detect all errors or fraud;

• the Company’s dependence on the accuracy and completeness of information about clients and counterparties;

• the fiscal and monetary policies of the federal government and its agencies;

• the failure to satisfy capital adequacy and liquidity guidelines applicable to the Company;

• downgrades in the Company’s credit rating;

• changes in interest rates which could affect interest rate spreads and net interest income;

• costs and effects of litigation, regulatory investigations or similar matters;

• a failure by the Company to effectively manage the risks the Company faces, including credit, operational and cyber security risks;

• increased pressures from competitors (both banks and non-banks) and/or an inability by the Company to remain competitive in the financial services industry, particularly in the markets which the Company serves, and keep pace with technological changes;

• unpredictable natural or other disasters, which could impact the Company’s customers or operations;

• a loss of customer deposits, which could increase the Company’s funding costs;

• the disparate impact that can result from having loans concentrated by loan type, industry segment, borrower type or location of the borrower or collateral;

• changes in the creditworthiness of customers;

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• increased loan losses or impairment of goodwill and other intangibles;

• negative public opinion which could damage the Company’s reputation and adversely impact business and revenues;

• the Company depends on the expertise of key personnel, and if these individuals leave or change their roles without effective replacements, operations may suffer;

• the Company may not be able to hire or retain additional qualified personnel and recruiting and compensation costs may increase as a result of turnover, both of which may increase costs and reduce profitability and may adversely impact the Company’s ability to implement the Company’s business strategies; and

• changes in the Company’s accounting policies or in accounting standards which could materially affect how the Company reports financial results and condition.

The Company does not undertake, and specifically disclaims any obligation, to publicly release the result of any revisions which may be made to any forward-looking statements to reflect the occurrence of anticipated or unanticipated events or circumstances after the date of such statements. You are cautioned not to place undue reliance on these forward-looking statements.

OVERVIEW

Cambridge Bancorp (together with its bank subsidiary, unless the context otherwise requires, the “Company”) is a Massachusetts state-chartered, federally registered bank holding company headquartered in Cambridge, Massachusetts. The Company, is a Massachusetts corporation formed in 1983 and has one bank subsidiary: Cambridge Trust Company (the “Bank”) formed in 1890.  As of March 31, 2018, the Company had total assets of approximately $2.0 billion. The Bank operates 10 full-service banking offices in six cities and towns in Eastern Massachusetts. As a Private Bank, we focus on four core services that center around client needs. Our core services include Wealth Management, Commercial Banking, Residential Lending, and Personal Banking. The Bank’s customers consist primarily of consumers and small- and medium-sized businesses in these communities and surrounding areas throughout Massachusetts and New Hampshire. The Company’s Wealth Management Group has four offices, one in Boston, Massachusetts and three in New Hampshire in Concord, Manchester, and Portsmouth. As of March 31, 2018, the Company had Assets under Management and Administration of approximately $3.1 billion. The Wealth Management Group offers comprehensive investment management, as well as trust administration, estate settlement, and financial planning services. Our wealth management clients value personal service and depend on the commitment and expertise of our experienced banking, investment, and fiduciary professionals.  

The Wealth Management Group customizes its investment portfolios to help its clients meet their long-term financial goals while moderating short-term stock market volatility. Through careful monitoring of asset allocation and disciplined security selection, the Bank’s in-house investment team provides clients with long-term capital growth while minimizing risk. Our internally developed, research-driven process is managed by our team of portfolio managers and analysts. We build discretionary portfolios consisting of our best investment ideas, focusing on individual global equities, fixed income securities, exchange-traded funds, and mutual funds. Our team-oriented approach fosters spirited discussion and rigorous evaluation of investments.

The Company offers a wide range of services to commercial enterprises, non-profit organizations, and individuals. The Company emphasizes service to consumers and small- and medium-sized businesses in its market area. The Company makes commercial loans, commercial real estate loans, construction loans, consumer loans, and real estate loans (including one-to-four family and home equity lines of credit), and accepts savings, time, and demand deposits. In addition, the Company offers a wide range of commercial and personal banking services which include cash management, online banking, mobile banking, and global payments.  The Company has one trademark, “Thought Series.”

The Company’s results of operations are largely dependent on net interest income, which is the difference between the interest earned on loans and securities and interest paid on deposits and borrowings, and non-interest income largely from its wealth management services. The results of operations are affected by the level of income and fees from loans, deposits, as well as operating expenses, the provision for loan losses, the impact of federal and state income taxes, the relative levels of interest rates, and local and national economic activity.

Through the Bank, the Company focuses on wealth management, the commercial banking business and private banking for clients, including residential lending and personal banking. Within the commercial loan portfolio, the Company has traditionally been a commercial real estate lender and in recent years has diversified commercial operations within the areas of commercial and industrial lending to include Innovation Banking, which specializes in working with New England-based entrepreneurs, and asset based lending that helps companies throughout New England and New York grow by borrowing against existing assets. The Innovation Banking group has a narrow client focus for lending and provides a local banking option for technology and entrepreneurial companies within our market area that are primarily serviced by out-of-market institutions. Personal banking focuses on providing exceptional service to clients and in deepening relationships.

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Critical Accounting Policies

Accounting policies involving significant judgments and assumptions by management, which have, or could have, a material impact on the carrying value of certain assets and impact income, are considered critical accounting policies. The Company considers allowance for loan losses and income taxes to be its critical accounting policies. There have been no significant changes to the Company’s critical accounting policies and estimates from those disclosed in our Annual Report on Form 10-K for the fiscal year ended December 31, 2017.

Recent Accounting Developments

See Note 4 to the Unaudited Consolidated Financial Statements for details of recently issued and adopted accounting pronouncements and their expected impact on the Company’s financial statements.

Results of Operations

Results of Operations for the three months ended March 31, 2018 and March 31, 2017

General. Net income increased $1.5 million, or 34.1%, to $5.8 million for the quarter ended March 31, 2018, as compared to net income of $4.3 million for the quarter ended March 31, 2017, primarily due to an $813,000 increase in net interest and dividend income after the provision for loan losses, an $851,000 increase in non-interest income, and a $368,000 decrease in income tax expense.  Net income increases were partially offset by a $555,000 increase in noninterest expense. As previously reported, the Tax Cuts and Jobs Act reduced the statutory federal tax rate to 21% from 35% effective in 2018, contributing to the increase in net income.  

Net Interest and Dividend Income. Net interest and dividend income after the provision for loan losses increased by $813,000, or 5.8%, to $14.7 million for the quarter ended March 31, 2018, as compared to $13.9 million for the quarter ended March 31, 2017. The increase was due to a combination of higher average interest-earning assets and higher yields on these assets.  Average interest earning assets increased by $108.1 million, or 6.1%, to $1.9 billion as of March 31, 2018, from $1.8 billion as of March 31, 2017. The Company’s net interest margin, on a fully taxable equivalent basis, increased two basis points to 3.28% for the quarter ended March 31, 2018, as compared to 3.26% for the quarter ended March 31, 2017.  

Interest and Dividend Income. Total interest and dividend income increased $1.5 million, or 9.9%, to $16.1 million for the quarter ended March 31, 2018, as compared to $14.7 million for the quarter ended March 31, 2017, primarily due to a $970,000 increase in interest income from loans, a $277,000 increase in interest on investment securities, and a $203,000 increase in interest on overnight investments.

Interest Expense.Interest expense increased $267,000, or 37.5%, to $1.0 million for the quarter ended March 31, 2018, as compared to $712,000 for the quarter ended March 31, 2017. The increase was driven by a $47.1 million increase in average interest bearing liabilities, which contributed to a five basis points increase in the average cost of funds of 0.21% from 0.16%. The increase in average interest bearing liabilities was primarily driven by an increase in average savings balances of $54.6 million. We experienced an increase in the average cost of savings accounts for the quarter ended March 31, 2018, as compared to March 31, 2017 as the Company has been able to grow these products and attract new and deepen client relationships.

Provision for Loan Losses. The Company recorded a provision for loan losses of $409,000 for the quarter ended March 31, 2018, as compared to $30,000 for the quarter ended March 31, 2017. The increase in the provision is primarily driven by loan growth during the first quarter of 2018 as compared to the first quarter of 2017. We recorded net recoveries of $3,000 for the quarter ended March 31, 2018, as compared to net charge-offs of $2,000 in 2017. The allowance for loan losses was $15.7 million, or 1.14% of total loans at March 31, 2018, as compared to $15.3 million, or 1.17% of total loans at March 31, 2017.  

Noninterest Income. Total noninterest income increased by $851,000, or 11.6%, to $8.2 million for the quarter ended March 31, 2018, as compared to $7.3 million for the quarter ended March 31, 2017 primarily as a result of increased Wealth Management revenue. Noninterest income was 35.1% of total revenue for the quarter ended March 31, 2018. Wealth Management revenue increased by $764,000, or 14.2%, for the quarter ended March 31, 2018, primarily due to market appreciation. Wealth Management Assets under Management increased by $293.7 million, or 11.0%, to $3.0 billion as of March 31, 2018, as compared to $2.7 billion as of March 31, 2017. Loan related derivative income increased $284,000 for the quarter ended March 31, 2018, as compared to 2017 due to the volume of derivative transactions executed in the first quarter of 2018.

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The categories of Wealth Management revenues are shown in the following table:

	For the Three Months Ended March 31,
	2018		2017
	(dollars in thousands)
Wealth Management revenues:
Trust and investment advisory fees	$	5,932	$	5,172
Asset-based revenues		5,932		5,172
Financial planning fees and other service fees		194		190
Total wealth management revenues	$	6,126	$	5,362

The following table presents the changes in Wealth Management assets under management:

	For the Three Months Ended March 31,
	2018			2017
	(dollars in thousands)
Wealth Management assets under management
Balance at the beginning of the period	$	2,971,322		$	2,572,760
Gross client asset inflows		75,142			90,523
Gross client asset outflows		(74,730	)		(71,334	)
Net investment appreciation & income		3,064			89,153
Balance at the end of the period	$	2,974,798		$	2,681,102
Weighted average management fee		0.80	%		0.80	%

There were no significant changes to the average fee rates and fee structure for the three months ended March 31, 2018 and 2017.

Noninterest income increases were partially offset by lower gains on loans held for sale of $208,000 and lower deposit account fee income of $63,000 for the quarter ended March 31, 2018, as compared to the quarter ended March 31, 2017.

Noninterest Expense.Total noninterest expense increased by $555,000, or 3.7%, to $15.5 million for the quarter ended March 31, 2018, as compared to $14.9 million for the quarter ended March 31, 2017, primarily driven by higher salaries and employee benefits expense and higher marketing expense. The increase in salaries and employee benefits expense of $917,000 was driven by the combination of increased staffing to support business initiatives, higher employee benefit costs, and the adoption of new accounting guidance (“ASU 2017-07”) for the presentation of net periodic pension costs and net periodic postretirement benefit costs. The amount added to salaries and benefits expense from the adoption of ASU 2017-07 during the first quarter of 2018 was approximately $239,000, which was correspondingly recorded as a decrease in other expense during the first quarter of 2018. The adoption of ASU 2017-07 required that the Company represent the impacted line items for the first quarter of 2017. The result of this retrospective application for the first quarter of 2017 was a decrease in salaries and benefits expense of approximately $56,000 and a corresponding increase in other expense for the same amount. The increase of $168,000 in marketing expense was due to the increased focus of growing brand awareness within our markets.

Noninterest expense increases were partially offset by lower other expenses of $418,000, primarily resulting from the adoption of new accounting guidance for net periodic pension cost and net periodic postretirement benefit cost as discussed above, lower data processing costs of $93,000, and lower occupancy and equipment expenses of $26,000 for the quarter ended March 31, 2018, as compared to March 31, 2017.

Income Tax Expense. In accordance with the Tax Cuts and Jobs Act of 2017, the Company’s statutory federal tax rate decreased from 35% to 21% effective January 1, 2018. The Company recorded a provision for income taxes of $1.6 million for the quarter ended March 31, 2018, as compared to $2.0 million for the same quarter in 2017. The effective tax rate was 21.8% for the quarter ended March 31, 2018, as compared to 31.4% for the same quarter in 2017. Additionally, the Company recognized $148,000 of tax benefit resulting from the accounting for share-based payments during the first quarter of 2018.

Changes in Financial Condition

Total Assets. Total assets increased $11.8 million, or 0.6%, to $2.0 billion at March 31, 2018, from $1.9 billion at December 31, 2017. The increase was primarily the result of a $30.9 million increase in loans, a $25.1 million increase in investment securities partially offset by a decrease in cash and cash equivalents of $47.3 million.

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Cash and Cash Equivalents. Cash and cash equivalents decreased by $47.3 million to $56.3 million at March 31, 2018 from $103.6 million at December 31, 2017 as cash on hand was used to fund loan growth and investment securities purchases during the quarter.

Investment Securities. The carrying value of total investment securities increased by $25.1 million to $462.3 million at March 31, 2018, from $437.2 million at December 31, 2017. The increase in investment securities was primarily driven by an increase of $32.2 million in held to maturity investment securities, offset by a decrease of $7.1 million in available for sale investment securities.

Loans. Total loans increased $30.9 million, or 2.3%, from December 31, 2017 and stood at $1.4 billion as of March 31, 2018. The growth in total loans was primarily due to increases in commercial real estate loans of $22.6 million, or 3.6%, from $633.6 million at December 31, 2017 to $656.3 million at March 31, 2018 and increases in commercial and industrial loans of $10.1 million, or 15.4%, from $65.3 million at December 31, 2017 to $75.4 million at March 31, 2018. Net loan growth during the quarter was healthy despite continued payoffs and strong competition in the greater Boston area.

Bank-Owned Life Insurance. The Company invests in bank-owned life insurance to help offset the costs of our employee benefit plan obligations. Bank-owned life insurance also generally provides noninterest income that is nontaxable. At March 31, 2018, our investment in bank-owned life insurance was $30.5 million, representing a decrease of $548,000 from $31.1 million at December 31, 2017, primarily due to payment of death benefits recorded during the first quarter of 2018.

Deposits. Total deposits were $1.8 billion at March 31, 2018 and December 31, 2017. Core deposits, which the Company defines as all deposits other than certificates of deposit, increased by $20.6 million, or 1.3%, from December 31, 2017. The increase was primarily due to a $43.0 million increase in savings accounts, a $9.5 million increase in demand deposits, partially offset by a $26.1 million decrease in interest bearing checking and a $5.8 million decrease in money market accounts.  The Bank continues to run promotional saving campaigns to attract and deepen client relationships.  The cost of total deposits for the quarter ended March 31, 2018 was 0.22%, as compared to 0.17% for the quarter ended March 31, 2017 and is unchanged from the quarter ended December 31, 2017.

Borrowings. At March 31, 2018, borrowings consisted of advances from the FHLB of Boston. Total borrowings decreased slightly to $3.5 million at March 31, 2018, from $3.6 million at December 31, 2017.

Shareholders’ Equity. Total shareholders’ equity increased $2.9 million, or 2.0%, to $150.9 million at March 31, 2018, from $148.0 million at December 31, 2017. The increase was primarily the result of net income of $5.8 million and an increase of $402,000 in additional paid-in capital related to stock-based compensation, partially offset by increases in unrealized losses of $1.4 million in available for sale securities, and regular dividend payments of $2.0 million. The Company adopted ASU 2018-02 in the first quarter of 2018 and reclassed $1.3 million from accumulated other comprehensive income to retained earnings to reflect the stranded tax effects related to the Tax Cuts and Jobs Act of 2017.  

Investment Securities

The Company’s securities portfolio consists of securities available for sale (“AFS”) and securities held to maturity (“HTM”). The largest component of the securities portfolio is mortgage-backed securities, all of which are issued by U.S. government agencies or U.S. government-sponsored enterprises.

Securities available for sale consist of certain U.S. Government Sponsored Enterprises (“GSE”) and U.S. GSE mortgage-backed securities, corporate debt securities, and mutual funds. These securities are carried at fair value, and except for equity securities, unrealized gains and losses, net of applicable income taxes, are recognized as a separate component of shareholders’ equity. Changes in fair value for equity securities are recognized in earnings in accordance with ASU 2016-01.

The fair value of securities available for sale totaled $197.9 million and included gross unrealized gains of $205,000 and gross unrealized losses of $5.8 million at March 31, 2018.  At December 31, 2017, the fair value of securities available for sale totaled $205.0 million and included gross unrealized gains of $260,000 and gross unrealized losses of $4.2 million.

Securities classified as held to maturity consist of certain U.S. GSE and U.S. GSE mortgage-backed securities, corporate debt securities, and state, county, and municipal securities. Securities held to maturity as of March 31, 2018 are carried at their amortized cost of $264.4 million. At December 31, 2017, securities held to maturity totaled $232.2 million.

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The following table sets forth the fair value of available for sale investment securities, the amortized costs of held to maturity investment securities, and the percentage distribution at the dates indicated:

	March 31,					December 31,
	2018					2017
	Amount		Percent			Amount		Percent
	(dollars in thousands)
Available for sale securities
U.S. GSE obligations	$	88,423		45	%	$	88,791		43	%
Mortgage-backed securities		103,980		53	%		110,626		55	%
Corporate debt securities		4,945		2	%		5,001		2	%
Mutual funds		587		0	%		599		0	%
Total securities available for sale	$	197,935		100	%	$	205,017		100	%
Held to maturity securities
U.S. GSE obligations	$	32,572		12	%	$	32,572		14	%
Mortgage-backed securities		146,316		55	%		117,155		50	%
Corporate debt securities		6,966		3	%		1,998		1	%
Municipal securities		78,555		30	%		80,463		35	%
Total securities held to maturity	$	264,409		100	%	$	232,188		100	%
Total	$	462,344		100	%	$	437,205		100	%

The following tables set forth the composition and maturities of debt investment securities. Actual maturities may differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties.

	Within One Year					After One, But Within Five Years					After Five, But Within Ten Years					After Ten Years					Total
	Amortized Cost		Weighted Average Yield (1)			Amortized Cost		Weighted Average Yield (1)			Amortized Cost		Weighted Average Yield (1)			Amortized Cost		Weighted Average Yield (1)			Amortized Cost		Weighted Average Yield (1)
At March 31, 2018	(dollars in thousands)
Available for sale securities
U.S. GSE obligations	$	20,017		1.1	%	$	70,000		1.3	%	$	—		—		$	—		—		$	90,017		1.3	%
Mortgage-backed    securities		40		4.7	%		116		5.4	%		38,868		1.8	%		68,850		2.0	%		107,874		1.9	%
Corporate debt securities		—		—			5,029		2.0	%		—		—			—		—			5,029		2.0	%
Total available for    sale securities	$	20,057		1.1	%	$	75,145		1.4	%	$	38,868		1.8	%	$	68,850		2.0	%	$	202,920		1.6	%
Held to maturity securities
U.S. GSE obligations	$	5,004		1.4	%	$	27,568		2.4	%	$	—		—		$	—		—		$	32,572		2.3	%
Mortgage-backed    securities		3		6.0	%		190		4.4	%		34,891		2.3	%		111,232		2.5	%		146,316		2.5	%
Corporate debt securities		—		—			6,966		2.6	%		—		—			—		—			6,966		2.6	%
Municipal securities		4,326		5.0	%		12,611		4.6	%		35,076		3.8	%		26,542		3.8	%		78,555		4.0	%
Total held to maturity    securities	$	9,333		3.1	%	$	47,335		3.0	%	$	69,967		3.0	%	$	137,774		2.8	%	$	264,409		2.9	%
Total	$	29,390		1.7	%	$	122,480		2.0	%	$	108,835		2.6	%	$	206,624		2.5	%	$	467,329		2.3	%

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	Within One Year					After One, But Within Five Years					After Five, But Within Ten Years					After Ten Years					Total
	Amortized Cost		Weighted Average Yield (1)			Amortized Cost		Weighted Average Yield (1)			Amortized Cost		Weighted Average Yield (1)			Amortized Cost		Weighted Average Yield (1)			Amortized Cost		Weighted Average Yield (1)
At December 31, 2017	(dollars in thousands)
Available for sale securities
U.S. GSE obligations	$	14,999		1.1	%	$	75,022		1.3	%	$	—		—		$	—		—		$	90,021		1.3	%
Mortgage-backed securities		93		4.7	%		129		5.4	%		26,319		1.7	%		86,643		1.9	%		113,184		1.9	%
Corporate debt securities		—		—			4,034		1.7	%		1,000		2.6	%		—		—			5,034		1.8	%
Total available for    sale securities	$	15,092		1.1	%	$	79,185		1.3	%	$	27,319		1.8	%	$	86,643		1.9	%	$	208,239		1.6	%
Held to maturity securities
U.S. GSE obligations	$	—		—		$	32,572		2.2	%	$	—		—		$	—		—		$	32,572		2.2	%
Mortgage-backed securities		6		4.5	%		256		4.4	%		25,485		2.1	%		91,408		2.2	%		117,155		2.2	%
Corporate debt securities		—		—			1,998		2.5	%		—		—			—		—			1,998		2.5	%
Municipal securities		3,675		6.1	%		13,320		5.7	%		34,426		4.7	%		29,042		4.6	%		80,463		4.9	%
Total held to maturity    securities	$	3,681		6.1	%	$	48,146		3.2	%	$	59,911		3.5	%	$	120,450		2.8	%	$	232,188		3.1	%
Total	$	18,773		2.1	%	$	127,331		2.0	%	$	87,230		3.0	%	$	207,093		2.4	%	$	440,427		2.4	%

(1) Weighted Average Yield is shown on a fully taxable equivalent basis using a federal tax rate of 21% and 35% at March 31, 2018 and December 31, 2017, respectively.

Management evaluates securities for other-than-temporary impairment on at least a quarterly basis and more frequently when economic or market conditions warrant such evaluation. Consideration is given to: (1) the length of time and the extent to which the fair value has been less than cost; (2) the financial condition and near-term prospects of the issuer; and (3) the intent and ability of the Company to retain its investment in the issuer for a period of time sufficient to allow for any anticipated recovery in fair value.

Loans

The Company’s lending activities are conducted principally in Eastern Massachusetts. The Company grants single- and multi-family residential loans, commercial & industrial (“C&I”), commercial real estate (“CRE”), construction loans, and a variety of consumer loans.  Most of the loans granted by the Company are secured by real estate collateral. Repayment of the Company’s residential loans are generally dependent on the health of the employment market in the borrowers’ geographic areas and that of the general economy with liquidation of the underlying real estate collateral being typically viewed as the primary source of repayment in the event of borrower default. The repayment of C&I loans depends primarily on the cash flow and credit worthiness of the borrower and secondarily on the underlying collateral provided by the borrower.  As borrower cash flow may be difficult to predict, liquidation of the underlying collateral securing these loans is typically viewed as the primary source of repayment in the event of borrower default. However, collateral typically consists of equipment, inventory, accounts receivable, or other business assets that may fluctuate in value, so the liquidation of collateral in the event of default is often an insufficient source of repayment. The Company’s CRE loans are primarily made based on the cash flow from the collateral property and secondarily on the underlying collateral provided by the borrower, with liquidation of the underlying real estate collateral typically being viewed as the primary source of repayment in the event of borrower default. The Company’s construction loans are primarily made based on the borrower’s expected ability to execute and the future completed value of the collateral property, with sale of the underlying real estate collateral typically being viewed as the primary source of repayment.

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The following summary shows the composition of the loan portfolio at the dates indicated:

	March 31,					December 31,
	2018		% of Total			2017			% of Total
	(dollars in thousands)
Residential mortgage
Mortgages - fixed rate	$	299,182		22	%	$	298,851			22	%
Mortgages - adjustable rate		241,330		17	%		239,027			18	%
Deferred costs net of unearned fees		1,087		0	%		1,042			0	%
Total residential mortgages		541,599		39	%		538,920			40	%
Commercial mortgage
Mortgages - nonowner occupied		584,414		43	%		562,203			41	%
Mortgages - owner occupied		40,050		3	%		35,343			3	%
Construction		31,585		2	%		35,904			3	%
Deferred costs net of unearned fees		240		0	%		199			0	%
Total commercial mortgages		656,289		48	%		633,649			47	%
Home equity
Home equity - lines of credit		66,889		5	%		70,326			5	%
Home equity - term loans		4,452		0	%		3,863			0	%
Deferred costs net of unearned fees		251		0	%		255			0	%
Total home equity		71,592		5	%		74,444			5	%
Commercial & industrial
Commercial & industrial		75,354		5	%		65,305			5	%
Deferred costs net of unearned fees		11		0	%		(10	)		0	%
Total commercial & industrial		75,365		5	%		65,295			5	%
Consumer
Secured		35,705		3	%		37,272			3	%
Unsecured		1,188		0	%		1,303			0	%
Deferred costs net of unearned fees		16		0	%		16			0	%
Total consumer		36,909		3	%		38,591			3	%
Total loans	$	1,381,754		100	%	$	1,350,899			100	%

Residential Mortgage.Residential real estate loans held in portfolio amounted to $541.6 million at March 31, 2018, an increase of $2.7 million, or 0.5%, from $538.9 million at December 31, 2017, and consisted of one-to-four family residential mortgage loans. The residential mortgage portfolio represented 39% and 40% of total loans at March 31, 2018 and December 31, 2017, respectively.

The average loan balance outstanding in the residential portfolio was $366,000 and the largest individual residential mortgage loan outstanding was $4.2 million as of March 31, 2018. At March 31, 2018, this loan was performing in accordance with its original terms.

The Bank offers fixed and adjustable rate residential mortgage loans with maturities up to 30 years. One-to-four family residential mortgage loans are generally underwritten according to Freddie Mac guidelines, and we refer to loans that conform to such guidelines as “conforming loans.” The Bank generally originates and purchases both fixed and adjustable rate mortgage loans in amounts up to the maximum conforming loan limits as established by the Federal Housing Finance Agency, which increased to $453,100 in 2018 from $424,100 in 2017, for one-unit properties. In addition, the Bank also offers loans above conforming lending limits typically referred to as “jumbo” loans. These loans are typically underwritten to jumbo conforming guidelines; however, the Bank may choose to hold a jumbo loan within its portfolio with underwriting criteria that does not exactly match conforming guidelines. The Bank may also, from time to time, purchase residential loans that are either jumbo, conforming, or meet our Community Reinvestment Act (“CRA”) requirements. Purchases have historically been made to satisfy CRA requirements for lending to low and moderate income borrowers within the Bank’s CRA Assessment Area.

The Company does not offer reverse mortgages, nor do we offer loans that provide for negative amortization of principal, such as “Option ARM” loans, where the borrower can pay less than the interest owed on the loan, resulting in an increased principal balance during the life of the loan. We do not offer “subprime loans” (loans that are made with low down payments to borrowers with weakened credit histories typically characterized by payment delinquencies, previous charge-offs, judgments, bankruptcies, or borrowers with questionable repayment capacity as evidenced by low credit scores or high debt-burden ratios) or Alt-A loans (defined as loans having less than full documentation).    

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Residential real estate loans are originated both for sale to the secondary market, as well as for retention in the Bank’s loan portfolio. The decision to sell a loan to the secondary market or retain within the portfolio is determined based on a variety of factors including but not limited to the Bank’s asset/liability position, the current interest rate environment, and customer preference.

The Company is servicing mortgage loans sold to others without recourse of approximately $97.8 million at March 31, 2018 and $99.8 million at December 31, 2017.

The table below presents residential real estate loan origination activity for the periods indicated:

	March 31,		December 31,
	2018		2017
	(dollars in thousands)
Originations for retention in portfolio	$	20,441	$	101,307
Originations for sale to the secondary market		3,095		15,663
Total	$	23,536	$	116,970

Loans are sold with servicing retained or released.  The table below presents residential real estate loan sale activity for the periods indicated:

	March 31,		December 31,
	2018		2017
	(dollars in thousands)
Loans sold with servicing rights retained	$	—	$	10,338
Loans sold with servicing rights released		3,095		11,906
Total	$	3,095	$	22,244

Loans sold with the retention of servicing typically result in the capitalization of servicing rights. Loan servicing rights are included in other assets and are subsequently amortized as an offset to other income over the estimated period of servicing. The net balance of capitalized servicing rights amounted to $760,000 and $793,000 as of March 31, 2018 and December 31, 2017 respectively.

Commercial Mortgage.  The commercial real estate loans portfolio represented 48% and 47% of total loans at March 31, 2018 and December 31, 2017. Commercial real estate loans were $656.3 million as of March 31, 2018, an increase of $22.6 million, or 3.6% from $633.6 million at December 31, 2017.

Commercial real estate loans are secured by a variety of property types, with approximately 90.4% of the total at March 31, 2018 composed of multi-family dwellings, retail facilities, office buildings, commercial mixed use, lodging, and industrial and warehouse properties. The average loan balance outstanding in this portfolio was $1.6 million, and the largest individual commercial real estate loan outstanding was $16.8 million as of March 31, 2018. At March 31, 2018, this commercial mortgage was performing in accordance with its original terms.

Generally, our commercial real estate loans are for terms of up to ten years, with loan-to-values that generally do not exceed 75%.  Amortization schedules are long term, and thus, a balloon payment is generally due at maturity. Under most circumstances, the Bank will offer to rewrite or otherwise extend the loan at prevailing interest rates.

Home Equity.The home equity portfolio totaled $71.6 million and $74.4 million at March 31, 2018 and December 31, 2017, respectively.  The home equity portfolio represented 5% of total loans at March 31, 2018 and December 31, 2017.

Home equity lines of credit are extended as both first and second mortgages on owner-occupied residential and one-to-four family investment properties in the Bank’s market area. Home equity lines of credit are generally underwritten with the same criteria that we use to underwrite one-to-four family residential mortgage loans.

Our home equity lines of credit are revolving lines of credit which generally have a term between 15 and 20 years, with draws available for the first ten years. Our 15 year lines of credit are interest only during the first ten years and amortize on a five year basis thereafter. Our 20 year lines of credit are interest only during the first ten years and amortize on a ten year basis thereafter. We generally originate home equity lines of credit with loan-to-value ratios of up to 80% when combined with the principal balance of the existing first mortgage loan, although loan-to-value ratios may occasionally exceed 80% on a case by case basis. Maximum combined loan-to-values are determined based on an applicant’s loan/line amount and the estimated property value. Lines of credit above $1 million generally will not exceed combined loan-to-value of 75%. Rates are adjusted monthly based on changes in a designated market index.

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At March 31, 2018, the average loan balance outstanding in this portfolio was $69,000, and the largest home equity line of credit was a $2.2 million line of credit and had an outstanding balance of $2.2 million. At March 31, 2018, this line of credit was performing in accordance with its original terms.

We also offer home equity term loans which are extended as second mortgages on owner-occupied residential properties in our market area. Our home equity term loans are fixed-rate second mortgage loans, which generally have a term between 5 and 20 years.

Commercial and Industrial (C&I).  The commercial and industrial portfolio totaled $75.4 million and $65.3 million at March 31, 2018 and December 31, 2017, respectively.  The C&I portfolio represented 5% of total loans at March 31, 2018 and December 31, 2017. The average loan balance outstanding in this portfolio was $120,000 and the largest individual commercial and industrial loan outstanding was $14.1 million as of March 31, 2018. At March 31, 2018, this loan was performing in accordance with its original terms.

The Company’s C&I loan customers represent various small- and middle-market established businesses involved in professional services, accommodation and food services, health care, wholesale trade, manufacturing, distribution, retailing, and non-profits. Most clients are privately owned with markets that range from local to national in scope. Many of the loans to this segment are secured by liens on corporate assets and the personal guarantees of the principals. The Company also makes loans to entrepreneurial and technology businesses.  The regional economic strength or weakness impacts the relative risks in this loan category. There is little concentration in any one business sector, and loan risks are generally diversified among many borrowers.

Consumer Loans.  The consumer loan portfolio totaled $36.9 million at March 31, 2018 from $38.6 million at December 31, 2017.   Consumer loans represented 3% of the total loans portfolio at March 31, 2018 and December 31, 2017.  Consumer loans include secured and unsecured loans, lines of credit, and personal installment loans. Unsecured consumer loans generally have greater risk compared to longer-term loans secured by improved, owner-occupied real estate,particularly consumer loans that are secured by rapidly depreciable assets.  The secured consumer loans and lines portfolio are generally fully secured by pledged assets such as bank accounts or investments.

Loan Portfolio Maturities. The following table summarizes the dollar amount of loans maturing in the portfolio based on their loan type and contractual terms to maturity at March 31, 2018. The table does not include any estimate of prepayments, which can significantly shorten the average life of all loans and may cause our actual repayment experience to differ from that shown below. Demand loans, loans having no stated repayment schedule or maturity, and overdraft loans are reported as being due in one year or less.

	March 31, 2018
	One Year or Less		One to Five Years		Over Five Years		Total
	(dollars in thousands)
Residential mortgage	$	1,178	$	14,487	$	525,934	$	541,599
Commercial mortgage		23,212		175,536		457,541		656,289
Home equity		1,040		1,124		69,428		71,592
Commercial & Industrial		41,380		29,948		4,037		75,365
Consumer		36,853		56		—		36,909
Total	$	103,663	$	221,151	$	1,056,940	$	1,381,754

Loan Portfolio by Interest Rate Type. The following table summarizes the dollar amount of loans in our portfolio based on whether the loan has a fixed, adjustable or floating rate of interest at March 31, 2018. Floating rate loans are tied to a market index while adjustable rate loans are adjusted based on the contractual terms of the loan.

	March 31, 2018
	Fixed		Adjustable		Floating		Total
	(dollars in thousands)
Residential mortgage	$	299,784	$	241,815	$	—	$	541,599
Commercial mortgage		313,197		156,889		186,203		656,289
Home equity		4,692		37		66,863		71,592
Commercial & Industrial		20,475		443		54,447		75,365
Consumer		208		—		36,701		36,909
Total	$	638,356	$	399,184	$	344,214	$	1,381,754

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Nonperforming Loans and TROUBLED DEBT RESTRUCTURINGS (TDRs)

The composition of nonperforming assets is as follows:

	March 31,			December 31,
	2018			2017
	(dollars in thousands)
Nonaccruals	$	1,405		$	1,148
Loans past due > 90 days, but still accruing		—			—
Troubled debt restructurings		142			150
Total nonperforming loans	$	1,547		$	1,298
Accruing troubled debt restructured loans	$	23		$	29
Nonperforming loans as a percentage of gross loans		0.11	%		0.10	%
Nonperforming loans as a percentage of total assets		0.08	%		0.07	%

At March 31, 2018 and December 31, 2017, impaired loans had specific reserves of $90,000 and $93,000, respectively.  

Nonaccrual Loans.  Loans are typically placed on nonaccrual status when any payment of principal and/or interest is 90 days or more past due, unless the collateral is sufficient to cover both principal and interest and the loan is in the process of collection. The Company monitors closely the performance of its loan portfolio. In addition to the monitoring and review of loan performance internally, the Company has contracted with an independent organization to review the Company’s commercial and commercial real estate loan portfolios. This independent review was performed in each of the past five years. The status of delinquent loans, as well as situations identified as potential problems, is reviewed on a regular basis by senior management.

Troubled Debt Restructurings.Loans are considered restructured in a troubled debt restructuring when the Company has granted concessions to a borrower due to the borrower’s financial condition that it otherwise would not have considered. These concessions may include modifications of the terms of the debt such as deferral of payments, extension of maturity, reduction of principal balance, reduction of the stated interest rate other than normal market rate adjustments, or a combination of these concessions. Debt may be bifurcated with separate terms for each tranche of the restructured debt. Restructuring a loan in lieu of aggressively enforcing the collection of the loan may benefit the Company by increasing the ultimate probability of collection.

Restructured loans are classified as accruing or non-accruing based on management’s assessment of the collectability of the loan. Loans which are already on nonaccrual status at the time of the restructuring generally remain on nonaccrual status for approximately six months or longer before management considers such loans for return to accruing status. Accruing restructured loans are placed into nonaccrual status if and when the borrower fails to comply with the restructured terms and management deems it unlikely that the borrower will return to a status of compliance in the near term.

Troubled debt restructurings are classified as impaired loans. The Company identifies loss allocations for impaired loans on an individual loan basis.  

Total nonperforming loans increased slightly during the months ended March 31, 2018 as compared to December 31, 2017, primarily due to an increase in residential non-accrual loans.

The Company continues to monitor closely the portfolio of nonperforming loans for which management has concerns regarding the ability of the borrowers to perform. The majority of the loans are secured by real estate and are considered to have adequate collateral value to cover the loan balances at March 31, 2018 and December 31, 2017, although such values may fluctuate with changes in the economy and the real estate market.

Allowance for Loan Losses

The Company maintains an allowance for loan losses in an amount determined by management on the basis of the character of the loans, loan performance, financial condition of borrowers, the value of collateral securing loans, and other relevant factors. We provide for loan losses based upon the consistent application of our documented allowance for loan loss methodology. All loan losses are charged to the allowance for loan losses and all recoveries are credited to it. Additions to the allowance for loan losses are provided by charges to income based on various factors which, in our judgment, deserve current recognition in estimating probable losses. We regularly review the loan portfolio, including a review of our classified assets, and make provisions for loan losses in order to maintain the allowance for loan losses in accordance with GAAP.  See additional discussion regarding the allowance for loan losses, in Item 7 under the caption “Critical Accounting Policies” of the Company’s Annual Report on Form 10-K for the fiscal year ended December 31, 2017 and in Note 7 to the Unaudited Consolidated Financial Statements.

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The following table summarizes the changes in the Company’s allowance for loan losses for the periods indicated:

	March 31,			December 31,
	2018			2017
	(dollars in thousands)
Period-end loans outstanding (net of unearned    discount and deferred loan fees)	$	1,381,754		$	1,350,899
Average loans outstanding (net of unearned    discount and deferred loan fees)	$	1,363,601		$	1,333,341
Balance of allowance for loan losses at the    beginning of year	$	15,320		$	15,261
Loans charged-off:
Commercial and industrial		(5	)		(284	)
Commercial mortgage		—			—
Residential mortgage		—			—
Home Equity		—			—
Consumer		(5	)		(39	)
Total loans charged-off	$	(10	)	$	(323	)
Recovery of loans previously charged-off:
Commercial and industrial		11			13
Commercial mortgage		—			—
Residential mortgage		—			—
Home Equity		—			—
Consumer		2			7
Total recoveries of loans previously    charged-off:		13			20
Net loan (charge-offs) recoveries	$	3		$	(303	)
Provision charged to operating expense		409			362
Balance at end of period	$	15,732		$	15,320
Ratio of net (charge-offs) recoveries during    the year to average loans outstanding		0.00	%		(0.02	)%
Ratio of allowance for loan losses to loans    outstanding		1.14	%		1.13	%

The level of charge-offs depends on many factors, including the national and regional economy. Cyclical lagging factors may result in charge-offs being higher than historical levels. The dollar amount of the allowance for loan losses increased primarily as a result of loan growth and changes in the portfolio composition.  Although the allowance is allocated between categories, the entire allowance is available to absorb losses attributable to all loan categories. Management believes that the allowance for loan losses is adequate.

Sources of Funds

General. Deposits traditionally have been our primary source of funds for our investment and lending activities. The Company also borrows from the FHLB of Boston to supplement cash flow needs, to lengthen the maturities of liabilities for interest rate risk management purposes, and to manage our cost of funds. Our additional sources of funds are scheduled payments and prepayments of principal and interest on loans and investment securities and fee income and proceeds from the sales of loans and securities.

Deposits.  The Company accepts deposits primarily from customers in the communities in which our branches and offices are located, as well as from small- and medium-sized businesses and other customers throughout our lending area. We rely on our competitive pricing and products, convenient locations, and client service to attract and retain deposits. We offer a variety of deposit accounts with a range of interest rates and terms. Our deposit accounts consist of relationship checking for consumers and businesses, statement savings accounts, certificates of deposit, money market accounts, interest on lawyer trust accounts, commercial and regular checking accounts, and individual retirement accounts. Deposit rates and terms are based primarily on current business strategies, market interest rates, liquidity requirements, and our deposit growth goals. The Bank may also access the brokered deposit market for funding.

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At March 31, 2018, we had a total of $101.1 million in certificates of deposit, excluding brokered deposits, of which $60.1 million had remaining maturities of one year or less. Based on historical experience and our current pricing strategy, we believe we will retain a large portion of these accounts upon maturity. As of March 31, 2018, we had a total of $45.2 million of brokered deposits and $52.7 million of brokered deposits at December 31, 2017.

The following tables set forth the average balances of the Bank’s deposits for the periods indicated:

	March 31,								December 31,
	2018								2017
	Average Balance		Percent			Weighted Average Rate			Average Balance		Percent			Weighted Average Rate
	(dollars in thousands)
Demand deposits (non-interest    bearing)	$	504,016		28.5	%		—		$	470,871		28.2	%		—
Interest bearing checking		436,741		24.7	%		0.05	%		394,132		23.6	%		0.05	%
Money Market		65,749		3.7	%		0.16	%		68,891		4.1	%		0.15	%
Savings		611,258		34.4	%		0.38	%		571,659		34.2	%		0.35	%
Retail certificates of deposit under    $100,000		37,539		2.1	%		0.49	%		40,447		2.4	%		0.49	%
Retail certificates of deposit of    $100,000 or greater		66,464		3.8	%		0.63	%		71,030		4.2	%		0.64	%
Wholesale certificates of deposit		48,877		2.8	%		1.60	%		54,933		3.3	%		1.56	%
Total	$	1,770,644		100	%		0.23	%	$	1,671,963		100	%		0.23	%

Borrowings.  The Bank’s borrowings consisted primarily of FHLB of Boston advances collateralized by a blanket pledge agreement on the Bank’s FHLB of Boston stock and residential mortgages held in the Bank’s portfolios. The Bank’s borrowings with the FHLB of Boston totaled $3.5 million at March 31, 2018, a decrease of $42,000 compared to $3.6 million at December 31, 2017.  

Net Interest Margin

Net interest income represents the difference between interest earned, primarily on loans and investments, and interest paid on funding sources, primarily deposits and borrowings. Interest rate spread is the difference between the average rate earned on total interest-earning assets and the average rate paid on total interest-bearing liabilities. Net interest margin is the amount of net interest income, on a fully taxable-equivalent basis, expressed as a percentage of average interest-earning assets. The average rate earned on earning assets is the amount of annualized taxable equivalent interest income expressed as a percentage of average earning assets. The average rate paid on interest-bearing liabilities is equal to annualized interest expense as a percentage of average interest-bearing liabilities.

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The following table sets forth the distribution of the Company’s average assets, liabilities and shareholders’ equity, and average rates earned or paid on a fully taxable equivalent basis for each of the periods indicated:

	Three Months Ended
	March 31, 2018									March 31, 2017
	Average Balance			Interest Income/ Expenses(1)			Rate Earned/ Paid (1)			Average Balance			Interest Income/ Expenses (1)			Rate Earned/ Paid (1)
	(dollars in thousands)
ASSETS
Interest-earning assets
Loans (2)
Taxable	$	1,352,562		$	13,378			4.01	%	$	1,302,602		$	12,373			3.85	%
Tax-exempt		11,039			122			4.48			16,796			202			4.88
Securities available for sale (3)
Taxable		206,463			837			1.64			314,813			1,272			1.64
Securities held to maturity
Taxable		167,010			877			2.13			21,757			122			2.27
Tax-exempt		79,207			787			4.03			82,726			1,023			5.02
Cash and due from banks		76,931			271			1.43			46,427			68			0.59
Total interest-earning assets (4)		1,893,212			16,272			3.49	%		1,785,121			15,060			3.42	%
Non interest-earning assets		68,608									71,278
Allowance for loan losses		(15,479	)								(15,248	)
Total assets	$	1,946,341								$	1,841,151
LIABILITIES AND SHAREHOLDERS’ EQUITY
Interest-bearing deposits
Checking accounts	$	436,741		$	50			0.05	%	$	420,669		$	17			0.02	%
Savings accounts		611,258			546			0.36			556,686			294			0.21
Money market accounts		65,749			25			0.15			70,444			26			0.15
Certificates of deposit		152,880			341			0.90			170,338			354			0.84
Total interest-bearing deposits		1,266,628			962			0.31			1,218,137			691			0.23
Other borrowed funds		3,551			17			1.94			4,919			21			1.73
Total interest-bearing liabilities		1,270,179			979			0.31	%		1,223,056			712			0.24	%
Non-interest-bearing liabilities
Demand deposits		504,016									457,648
Other liabilities		23,165									24,708
Total liabilities		1,797,360									1,705,412
Shareholders’ equity		148,981									135,739
Total liabilities & shareholders’ equity	$	1,946,341								$	1,841,151
Net interest income on a fully taxable equivalent basis					15,293									14,348
Less taxable equivalent adjustment					(191	)								(429	)
Net interest income				$	15,102								$	13,919
Net interest spread (5)								3.17	%								3.19	%
Net interest margin (6)								3.28	%								3.26	%

(1) Annualized on a fully taxable equivalent basis calculated using a federal tax rate of 21% in 2018 and 35% in 2017.

(2) Non-accrual loans are included in average amounts outstanding.

(3) Average balances of securities available for sale calculated utilizing amortized cost.

(4) Federal Home Loan Bank stock balance and dividend income is excluded from interest-earning assets.

(5) Interest rate spread represents the difference between the weighted average yield on interest-earning assets and the weighted average cost of interest-bearing liabilities.

(6) Net interest margin represents net interest income on a fully tax equivalent basis as a percentage of average interest-earning assets.

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Rate/Volume Analysis

The following table describe the extent to which changes in interest rates and changes in the volume of interest-earning assets and interest-bearing liabilities have affected the Company’s interest income and interest expense during the periods indicated. Information is provided in each category with respect to: (i) changes attributable to changes in volumes (changes in average balance multiplied by prior year average rate) and (ii) changes attributable to changes in rate (change in average interest rate multiplied by prior year average balance), while (iii) changes attributable to the combined impact of volumes and rates have been allocated proportionately to separate volume and rate categories.

	Three Months Ended March 31, 2018
	Compared with
	Three Months Ended March 31, 2017
	Increase/(Decrease) Due to Change in
	Volume			Rate			Total
	(dollars in thousands)
Interest income
Loans
Taxable	$	484		$	521		$	1,005
Tax-exempt		(65	)		(15	)		(80	)
Securities available for sale
Taxable		(439	)		4			(435	)
Securities held to maturity
Taxable		763			(8	)		755
Tax-exempt		(42	)		(194	)		(236	)
Cash and due from banks		65			138			203
Total interest income	$	766		$	446		$	1,212
Interest expense
Deposits
Checking accounts		1			32			33
Savings accounts		31			221			252
Money market accounts		(2	)		1			(1	)
Certificates of deposit		(38	)		25			(13	)
Total interest-bearing deposits		(8	)		279			271
Other borrowed funds		(6	)		2			(4	)
Total interest expense	$	(14	)	$	281		$	267
Change in net interest income	$	780		$	165		$	945

Market Risk and Asset Liability Management

Market risk is the risk of loss from adverse changes in market prices and rates. The Company’s market risk arises primarily from interest rate risk inherent in its lending and deposit-taking activities. To that end, management actively monitors and manages its interest rate risk exposure.

The Company’s profitability is affected by fluctuations in interest rates. A sudden and substantial change in interest rates may adversely impact the Company’s earnings to the extent that the interest rates borne by assets and liabilities do not change at the same speed, to the same extent, or on the same basis. The Company monitors the impact of changes in interest rates on its net interest income using several tools.

The Company’s primary objective in managing interest rate risk is to minimize the adverse impact of changes in interest rates on the Company’s net interest income and capital, while structuring the Company’s asset-liability structure to obtain the maximum yield-cost spread on that structure. The Company relies primarily on its asset-liability structure to control interest rate risk.

44

Interest Rate Sensitivity. The Company actively manages its interest rate sensitivity position. The objectives of interest rate risk management are to control exposure of net interest income to risks associated with interest rate movements and to achieve sustainable growth in net interest income. The Company’s Asset Liability Committee (“ALCO”), using policies and procedures approved by the Company’s board of directors, is responsible for the management of the Company’s interest rate sensitivity position. The Company manages interest rate sensitivity by changing the mix, pricing, and re-pricing characteristics of its assets and liabilities, through the management of its investment portfolio, its offerings of loan and selected deposit terms, and through wholesale funding. Wholesale funding consists of, but is not limited to, multiple sources including borrowings with the FHLB of Boston, the Federal Reserve Bank of Boston’s discount window, and certificates of deposit from institutional brokers.  

The Company uses several tools to manage its interest rate risk including interest rate sensitivity analysis, or gap analysis, market value of portfolio equity analysis, interest rate simulations under various rate scenarios, and net interest margin reports. The results of these reports are compared to limits established by the Company’s ALCO policies and appropriate adjustments are made if the results are outside the established limits.

The following tables demonstrate the annualized result of an interest rate simulation and the estimated effect that a parallel interest rate shift, or “shock,” in the yield curve and subjective adjustments in deposit pricing might have on the Company’s projected net interest income over the next 12 months.

This simulation assumes that there is no growth in interest-earning assets or interest-bearing liabilities over the next 12 months. The changes to net interest income shown below are in compliance with the Company’s policy guidelines.

As of March 31, 2018:

Change in Interest Rates (in Basis Points)	Percentage Change in Net Interest Income
+400	1.5
+300	1.2
+200	1.0
+100	0.7
–100	(7.5)

Economic Value of Equity Analysis. The Company also analyzes the sensitivity of the Bank’s financial condition to changes in interest rates through our economic value of equity model. This analysis measures the difference between estimated changes in the present value of the Bank’s assets and estimated changes in the present value of the Bank’s liabilities assuming various changes in current interest rates. The Bank’s economic value of equity analysis as of March 31, 2018 estimated that, in the event of an instantaneous 200 basis point increase in interest rates, the Bank would experience a 7.8% increase in the economic value of equity. At the same date, our analysis estimated that, in the event of an instantaneous 100 basis point decrease in interest rates, the Bank would experience a 17.9% decrease in the economic value of equity. The estimates of changes in the economic value of our equity require us to make certain assumptions including loan-and mortgage-related investment prepayment speeds, reinvestment rates, and deposit maturities and decay rates. These assumptions are inherently uncertain and, as a result, we cannot precisely predict the impact of changes in interest rates on the economic value of our equity. Although our economic value of equity analysis provides an indication of our interest rate risk exposure at a particular point in time, such estimates are not intended to, and do not, provide a precise forecast of the effect of changes in market interest rates on the economic value of our equity and will differ from actual results.

LIQUIDITY AND CAPITAL RESOURCES

Impact of Inflation and Changing Prices.  Our Consolidated Financial Statements and related notes have been prepared in accordance with GAAP. GAAP generally requires the measurement of financial position and operating results in terms of historical dollars without consideration of changes in the relative purchasing power of money over time due to inflation. The impact of inflation is reflected in the increased cost of our operations. Unlike industrial companies, our assets and liabilities are primarily monetary in nature. As a result, changes in market interest rates have a greater impact on performance than the effects of inflation.

Liquidity.  Liquidity is defined as the Company’s ability to generate adequate cash to meet its needs for day-to-day operations and material long- and short-term commitments. Liquidity risk is the risk of potential loss if the Company were unable to meet its funding requirements at a reasonable cost. The Company manages its liquidity based on demand and specific events and uncertainties to meet current and future financial obligations of a short-term nature. The Company’s objective in managing liquidity is to respond to the needs of depositors and borrowers, as well as increase to earnings enhancement opportunities in a changing marketplace.

45

The Company’s liquidity position is managed on a daily basis as part of the daily settlement function and continuously as part of the formal asset liability management process. The Bank’s liquidity is maintained by managing its core deposits as the primary source, selling investment securities, selling loans in the secondary market, borrowing from the FHLB of Boston, and purchasing wholesale certificates of deposit as its secondary sources.

The sources of funds for dividends paid by the Company are dividends received from the Bank and liquid funds held by the Company. The Company and the Bank are regulated enterprises and their abilities to pay dividends are subject to regulatory review and restriction. Certain regulatory and statutory restrictions exist regarding dividends, loans, and advances from the Bank to the Company. Generally, the Bank has the ability to pay dividends to the Company subject to minimum regulatory capital requirements.

Quarterly, the ALCO reviews the Company’s liquidity needs and reports any findings (if required) to the Board of Directors.

Capital Adequacy.  Total shareholders’ equity was $150.9 million at March 31, 2018, compared to $148.0 million at December 31, 2017. The Company’s equity increased primarily as a result of an increase in earnings. The ratio of average total equity to average total assets amounted to 7.65% at March 31, 2018 and 7.55% at December 31, 2017.   Book value per share at March 31, 2018 and December 31, 2017 amounted to $36.79 and $36.24, respectively.

The Company and the Bank are subject to various regulatory capital requirements. As of March 31, 2018, the Company and the Bank exceeded the regulatory minimum levels to be considered “well-capitalized.” See Item 1 - Notes to Unaudited Consolidated Financial Statements – Note 12 – Shareholders’ Equity.  

Financial Instruments with Off-Balance-Sheet Risk

The Company is party to financial instruments with off-balance-sheet risk in the normal course of business to meet the financing needs of its customers. These financial instruments primarily include commitments to originate and sell loans, standby letters of credit, unused lines of credit, and unadvanced portions of construction loans. The instruments involve, to varying degrees, elements of credit and interest rate risk in excess of the amount recognized in the consolidated balance sheet. The contract or notional amounts of those instruments reflect the extent of involvement the Company has in these particular classes of financial instruments.

The Company’s exposure to credit loss in the event of nonperformance by the other party to the financial instrument for loan commitments, standby letters of credit and unadvanced portions of construction loans is represented by the contractual amount of those instruments. The Company uses the same credit policies in making commitments and conditional obligations as it does for on-balance-sheet instruments.

Off-Balance-Sheet Arrangements.  Our significant off-balance-sheet arrangements consist of the following:

• Commitments to originate and sell loans;

• Standby and commercial letters of credit;

• Unused lines of credit;

• Unadvanced portions of construction loans;

• Unadvanced portions of other loans;

• Loan related derivatives;

• Risk participation agreements;

• Loan related derivatives; and

• Risk participation agreements.

Off-balance-sheet arrangements are more fully discussed within Note 11 – Financial Instruments with Off-Balance-Sheet Risk.  

Item 3. Quantitative and Qualitative Disclosures about Market Risk.

The information required by this item is included in Item 2 of this report under “Market Risk and Liability Management.”

46

Item 4. Controls and Procedures.

Conclusion Regarding the Effectiveness of Disclosure Controls and Procedures.  As of March 31, 2018, the Company carried out an evaluation, under the supervision and with the participation of the Company's management, including its Chief Executive Officer and its Chief Financial Officer, of the effectiveness of the Company's disclosure controls and procedures (as defined in Rules 13a-15(e) or 15d-15(e) of the Securities Exchange Act of 1934). Based on this evaluation, the Company's Chief Executive Officer and Chief Financial Officer concluded that the Company's disclosure controls and procedures were effective as of March 31, 2018 for recording, processing, summarizing, and reporting the information the Company is required to disclose in the reports it files under the Securities Exchange Act of 1934, within the time periods specified in SEC rules and forms.

The effectiveness of a system of disclosure controls and procedures is subject to various inherent limitations, including cost limitations, judgments used in decision making, assumptions about the likelihood of future events, the soundness of our systems, the possibility of human error, and the risk of fraud. Moreover, projections of any evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate because of changes in conditions and the risk that the degree of compliance with policies or procedures may deteriorate over time. Due to such inherent limitations, there can be no assurance that any system of disclosure controls and procedures will be successful in preventing all errors or fraud, or in making all material information known in a timely manner to the appropriate levels of management.

Changes in Internal Controls over Financial Reporting.  During the period ended March 31, 2018, there were no changes in the Company’s internal control over financial reporting that have materially affected, or are reasonably likely to materially affect, the Company’s internal control over financial reporting.

47

PART II—OTHER INFORMATION

Item 1. Legal Proceedings.

From time to time, the Company and its subsidiaries may be parties to various claims and lawsuits arising in the ordinary course of their normal business activities. Although the ultimate outcome of these suits, if any, cannot be ascertained at this time, it is the opinion of management that none of these matters, even if it resolved adversely to the Company, will have a material adverse effect on the Company’s consolidated financial position. The Company is not currently party to any pending legal proceedings.  

Item 1A. Risk Factors.

Please read “Risk Factors” in the Company’s Annual Report on Form 10-K for the fiscal year ended December 31, 2017. There have been no material changes since this 10-K was filed. These risks are not the only ones facing the Company. Additional risks and uncertainties not currently known to the Company or that the Company currently deems to be immaterial also may materially adversely affect the Company’s business, financial condition, and operating results.

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

The following table sets forth the information regarding the Company’s repurchases of its common stock during the three months ended March 31, 2018:  

	Total Number of Shares Repurchased (1)		Average Price Paid Per Share
Period
January 1 to January 31, 2018		6,039	$	79.26
February 1 to February 28, 2018		183	$	78.62
March 1 to March 31, 2018		18	$	87.30
Total		6,240

(1) Shares repurchased by the Company relate to shares tendered by employees to exercise stock options or to pay their income tax liability on current period RSA vestings.

The Company does not currently have a stock repurchase program or plan in place.  

Item 3. Defaults Upon Senior Securities  

None.

Item 4. Mine Safety Disclosures.

Not applicable.

Item 5. Other Information.

None.

48

Item 6. Exhibits.

Furnish the exhibits required by Item 601 of Regulation S-K (§ 229.601 of this chapter).

Exhibit Number	Description
31.1*	Certification of Principal Executive Officer Pursuant to Rules 13a-14(a) and 15d-14(a) under the Securities Exchange Act of 1934, as Adopted Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.
31.2*	Certification of Principal Financial Officer Pursuant to Rules 13a-14(a) and 15d-14(a) under the Securities Exchange Act of 1934, as Adopted Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.
32.1*	Certification of Principal Executive Officer Pursuant to 18 U.S.C. Section 1350, as Adopted Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.
32.2*	Certification of Principal Financial Officer Pursuant to 18 U.S.C. Section 1350, as Adopted Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.
101.INS	XBRL Instance Document
101.SCH	XBRL Taxonomy Extension Schema Document
101.CAL	XBRL Taxonomy Extension Calculation Linkbase Document
101.DEF	XBRL Taxonomy Extension Definition Linkbase Document
101.LAB	XBRL Taxonomy Extension Label Linkbase Document
101.PRE	XBRL Taxonomy Extension Presentation Linkbase Document

* Filed herewith.

49

SIGNATURES

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

	CAMBRIDGE BANCORP
May 9, 2018	By:	/s/  Denis K. Sheahan
		Denis K. Sheahan
		Chairman, Chief Executive Officer (Principal Executive Officer)
May 9, 2018
	By:	/s/  Michael F. Carotenuto
		Michael F. Carotenuto
		Chief Financial Officer (Principal Financial Officer and Principal Accounting Officer)

50

EX-31.1

Exhibit 31.1

CERTIFICATION PURSUANT TO

RULES 13a-14(a) AND 15d-14(a) UNDER THE SECURITIES EXCHANGE ACT OF 1934,

AS ADOPTED PURSUANT TO SECTION 302 OF THE SARBANES-OXLEY ACT OF 2002

I, Denis K. Sheahan, Chief Executive Officer of Cambridge Bancorp, certify that:

1. I have reviewed this Quarterly Report on Form 10-Q, for the period ended March 31, 2018, of Cambridge Bancorp;

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

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

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

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

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

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

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

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

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

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

May 9, 2018	By:	/s/  Denis K. Sheahan
		Denis K. Sheahan
		Chairman, Chief Executive Officer (Principal Executive Officer)

EX-31.2

Exhibit 31.2

CERTIFICATION PURSUANT TO

RULES 13a-14(a) AND 15d-14(a) UNDER THE SECURITIES EXCHANGE ACT OF 1934,

AS ADOPTED PURSUANT TO SECTION 302 OF THE SARBANES-OXLEY ACT OF 2002

I, Michael F. Carotenuto, Chief Financial Officer of Cambridge Bancorp, certify that:

1. I have reviewed this Quarterly Report on Form 10-Q, for the period ended March 31, 2018, of Cambridge Bancorp;

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

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

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

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

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

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

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

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

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

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

May 9, 2018	By:	/s/  Michael F. Carotenuto
		Michael F. Carotenuto
		Chief Financial Officer (Principal Financial Officer and Principal Accounting Officer)

EX-32.1

Exhibit 32.1

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350, AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report on Form 10-Q of Cambridge Bancorp (the “Company”) for the period ending March 31, 2018 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I hereby certify, pursuant to 18 U.S.C. § 1350, as adopted pursuant to § 906 of the Sarbanes-Oxley Act of 2002, that:

(1) The Form 10-Q Report fully complies with the requirements of section 13(a) or 15(d)  as applicable, of the Securities Exchange Act of 1934, as amended; and

(2) The information contained in the Form 10-Q Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

May 9, 2018	By:	/s/  Denis K. Sheahan
		Denis K. Sheahan
		Chairman, Chief Executive Officer (Principal Executive Officer)

EX-32.2

Exhibit 32.2

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350, AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report on Form 10-Q of Cambridge Bancorp (the “Company”) for the period ending March 31, 2018 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I hereby certify, pursuant to 18 U.S.C. § 1350, as adopted pursuant to § 906 of the Sarbanes-Oxley Act of 2002, that:

(1) The Form 10-Q Report fully complies with the requirements of section 13(a) or 15(d)  as applicable, of the Securities Exchange Act of 1934, as amended; and

(2) The information contained in the Form 10-Q Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

May 9, 2018	By:	/s/  Michael F. Carotenuto
		Michael F. Carotenuto
		Chief Financial Officer (Principal Financial Officer and Principal Accounting Officer)

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
Trading Symbol	CATC
Entity Registrant Name	CAMBRIDGE BANCORP
Entity Central Index Key	0000711772
Current Fiscal Year End Date	--12-31
Entity Filer Category	Non-accelerated Filer
Entity Common Stock, Shares Outstanding		4,099,865

XML

CONSOLIDATED BALANCE SHEETS (UNAUDITED) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Assets
Cash and cash equivalents	$ 56,265	$ 103,591
Investment securities
Available for sale, at fair value (amortized cost $203,507 and $208,911, respectively)	197,935	205,017
Held to maturity, at amortized cost (fair value $262,432 and $233,554, respectively)	264,409	232,188
Total investment securities	462,344	437,205
Loans
Residential mortgage	541,599	538,920
Commercial mortgage	656,289	633,649
Home equity	71,592	74,444
Commercial & Industrial	75,365	65,295
Consumer	36,909	38,591
Total loans	1,381,754	1,350,899
Less: allowance for loan losses	(15,732)	(15,320)
Net loans	1,366,022	1,335,579
Federal Home Loan Bank of Boston Stock, at cost	4,242	4,242
Bank owned life insurance	30,535	31,083
Banking premises and equipment, net	9,316	9,310
Deferred income taxes, net	7,910	8,273
Accrued interest receivable	5,059	5,128
Other assets	20,057	15,523
Total assets	1,961,750	1,949,934
Deposits
Demand	503,089	493,613
Interest bearing checking	436,841	462,957
Money market	63,508	69,259
Savings	632,707	589,741
Certificates of deposit	146,247	159,830
Total deposits	1,782,392	1,775,400
Long-term borrowings	3,537	3,579
Other liabilities	24,948	22,998
Total liabilities	1,810,877	1,801,977
Shareholders’ Equity
Common stock, par value $1.00; Authorized 10,000,000 shares; Outstanding: 4,100,747 shares and 4,082,188 shares, respectively	4,101	4,082
Additional paid-in capital	36,065	35,663
Retained earnings	119,196	114,093
Accumulated other comprehensive loss	(8,489)	(5,881)
Total shareholders’ equity	150,873	147,957
Total liabilities and shareholders’ equity	$ 1,961,750	$ 1,949,934

XML

CONSOLIDATED BALANCE SHEETS (UNAUDITED) (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Statement Of Financial Position [Abstract]
Available for sale securities, amortized cost	$ 203,507	$ 208,911
Held-to-maturity securities, fair value	$ 262,432	$ 233,554
Common stock, par value	$ 1.00	$ 1.00
Common stock, shares authorized	10,000,000	10,000,000
Common stock, shares, outstanding	4,100,747	4,082,188

XML

CONSOLIDATED STATEMENTS OF INCOME (UNAUDITED) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Interest and dividend income
Interest on taxable loans	$ 13,378	$ 12,373
Interest on tax-exempt loans	96	131
Interest on taxable investment securities	1,714	1,394
Interest on tax-exempt investment securities	622	665
Dividends on FHLB of Boston stock	51	42
Interest on overnight investments	271	68
Total interest and dividend income	16,132	14,673
Interest expense
Interest on deposits	962	691
Interest on borrowed funds	17	21
Total interest expense	979	712
Net interest and dividend income	15,153	13,961
Provision for loan losses	409	30
Net interest and dividend income after provision for loan losses	14,744	13,931
Noninterest income
Wealth management revenue	6,126	5,362
Deposit account fees	750	813
ATM/Debit card income	271	259
Bank owned life insurance income	128	162
(Loss) gain on disposition of investment securities		(2)
Gain on loans held for sale	27	235
Loan related derivative income	472	188
Other income	404	310
Total noninterest income	8,178	7,327
Noninterest expense
Salaries and employee benefits	10,073	9,156
Occupancy and equipment	2,227	2,253
Data processing	1,230	1,323
Professional services	887	870
Marketing	438	270
FDIC Insurance	151	161
Other expenses	495	913
Total noninterest expense	15,501	14,946
Income before income taxes	7,421	6,312
Income tax expense	1,616	1,984
Net income	$ 5,805	$ 4,328
Share data
Weighted average number of shares outstanding, basic	4,053,355	4,011,925
Weighted average number of shares outstanding, diluted	4,071,975	4,050,791
Basic earnings per share	$ 1.42	$ 1.07
Diluted earnings per share	$ 1.41	$ 1.06

XML

UNAUDITED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 5,805	$ 4,328
Unrealized gains/(losses) on available for sale securities
Unrealized holding gains/(losses) arising during period	(1,352)	189
Less: reclassification adjustment for losses/(gains) included in net income		1
Total unrealized gains/(losses) on securities	(1,352)	190
Defined benefit retirement plans
Change in retirement liabilities	10	132
Other comprehensive income/(loss)	(1,342)	322
Comprehensive income	$ 4,463	$ 4,650

XML

UNAUDITED CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS EQUITY - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive (Loss) Income
Beginning balance at Dec. 31, 2016	$ 134,671	$ 4,037	$ 33,253	$ 107,262	$ (9,881)
Net income	4,328			4,328
Other comprehensive income	322				322
Share based compensation	974	34	1,343	(403)
Dividends declared	(1,868)			(1,868)
Ending balance at Mar. 31, 2017	138,427	4,071	34,596	109,319	(9,559)
Beginning balance at Dec. 31, 2017	147,957	4,082	35,663	114,093	(5,881)
Cumulative effect of accounting changes				1,266	(1,266)
Net income	5,805			5,805
Other comprehensive income	(1,342)				(1,342)
Share based compensation	421	19	402
Dividends declared	(1,968)			(1,968)
Ending balance at Mar. 31, 2018	$ 150,873	$ 4,101	$ 36,065	$ 119,196	$ (8,489)

XML

UNAUDITED CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS EQUITY (Parenthetical) - $ / shares	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Retained Earnings
Dividends declared, per share	$ 0.48	$ 0.46

XML

UNAUDITED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 5,805	$ 4,328
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for loan losses	409	30
Amortization of deferred charges and fees, net	163	324
Depreciation and amortization	464	491
Bank owned life insurance income	(128)	(162)
Loss/(gain) on disposition of investment securities		2
Share based compensation	421	974
Change in accrued interest receivable	69	328
Deferred income tax expense (benefit)	770	818
Change in other assets, net	(4,944)	(1,275)
Change in other liabilities, net	2,371	(575)
Change in loans held for sale		5,788
Net cash provided by operating activities	5,400	11,071
CASH FLOWS FROM INVESTING ACTIVITIES
Origination of loans	(131,953)	(66,439)
Proceeds from principal payments of loans	101,197	75,672
Proceeds from calls/maturities of securities available for sale	5,208	18,995
Proceeds from sales of securities available for sale		32,701
Purchase of securities available for sale		(5,091)
Proceeds from calls/maturities of securities held to maturity	7,777	2,396
Purchase of securities held to maturity	(40,125)	(84,425)
Proceeds from settlement of bank owned life insurance policies	676
(Purchase) sale of FHLB of Boston stock		(553)
Purchase of banking premises and equipment	(470)	(289)
Net cash used by investing activities	(57,690)	(27,033)
CASH FLOWS FROM FINANCING ACTIVITIES
Change in demand, interest bearing, money market and savings accounts	20,575	(7,330)
Change in certificates of deposit	(13,601)	(1,150)
Repayment of long-term borrowings	(42)	(42)
Cash dividends paid on common stock	(1,968)	(1,868)
Net cash provided by financing activities	4,964	(10,390)
Net decrease in cash and cash equivalents	(47,326)	(26,352)
Cash and cash equivalents at beginning of period	103,591	54,050
Cash and cash equivalents at end of period	56,265	27,698
Cash paid during the period for:
Interest	$ 975	709
Income taxes		$ 840

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Basis of Presentation

3 Months Ended

Mar. 31, 2018

Organization Consolidation And Presentation Of Financial Statements [Abstract]

Basis of Presentation

1. BASIS OF PRESENTATION

The unaudited consolidated financial statements include the accounts of Cambridge Bancorp (the “Company”) and its wholly owned subsidiary, Cambridge Trust Company (the “Bank”), and the Bank’s wholly owned subsidiaries, Cambridge Trust Company of New Hampshire Inc., CTC Security Corporation, and CTC Security Corporation III. References to the Company herein relate to the consolidated group of companies. All significant intercompany accounts and transactions have been eliminated in preparation of the consolidated financial statements.

The Company is a state-chartered, federally registered bank holding company headquartered in Cambridge, Massachusetts and was incorporated in 1983. The Company is the sole shareholder of the Bank, a Massachusetts trust company chartered in 1890, which is a commercial bank.  We are a private bank offering a full range of private banking and wealth management services to our clients.  The private banking business, the Company’s only reportable operating segment is managed as a single strategic unit.  

The unaudited consolidated financial statements reflect all adjustments (consisting of normal recurring adjustments) and disclosures necessary to present fairly the Company’s financial position, as of March 31, 2018 and December 31, 2017, respectively, and the results of operations and cash flows for the interim periods presented in accordance with U.S. generally accepted accounting principles (“GAAP”). Interim results are not necessarily reflective of the results of the entire year.

For further information, refer to the consolidated financial statements and notes thereto included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2017, filed with the Securities and Exchange Commission.

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Use of Estimates

3 Months Ended

Mar. 31, 2018

Use Of Estimates [Abstract]

Use of Estimates

2. 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 disclosure of contingent assets and liabilities at the date of the financial statements. Actual results could differ from those estimates. The allowance for loan losses, the fair values of financial instruments, and the valuation of deferred tax assets are particularly subject to change.

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Subsequent Events

3 Months Ended

Mar. 31, 2018

Subsequent Events [Abstract]

Subsequent Events

3. Subsequent Events

Management has reviewed events occurring through May 9, 2018, the date the unaudited consolidated financial statements were available to be issued, and determined that no other subsequent events occurred requiring adjustment to or disclosure in these financial statements.

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Recently Issued and Adopted Accounting Guidance

3 Months Ended

Mar. 31, 2018

New Accounting Pronouncements And Changes In Accounting Principles [Abstract]

Recently Issued and Adopted Accounting Guidance

4. Recently Issued and Adopted Accounting Guidance

Accounting Standards Update No. 2018-02 - Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income (“ASU 2018-02”). On February 14, 2018, the Financial Accounting Standards Board (the “FASB”) issued amended guidance to address certain stranded income tax effects in accumulated other comprehensive income (“AOCI”) resulting from the Tax Cuts and Jobs Act. The ASU requires the following:

• A description of the accounting policy for releasing income tax effects from AOCI,

• Whether we elect to reclassify the stranded income tax effects from the Tax Cuts and Jobs Act, and

• Information about the other income tax effects that are reclassified.

The amendments in this ASU affect any organization that is required to apply the provisions of Topic 220, Income Statement—Reporting Comprehensive Income, and has items of other comprehensive income for which the related tax effects are presented in accumulated other comprehensive income, as required by GAAP. ASU 2018-02 is effective for the Company’s reporting period beginning on January 1, 2019; early adoption is permitted. The Company elected to early adopt ASU 2018-02 during the first quarter of 2018, and reclassed $1.3 million from AOCI to retained earnings in the period of adoption on the consolidated balance sheet, with zero net effect on total shareholders’ equity. This amount represents the difference in the Company’s current federal tax rate of 21% and the previous rate of 35%.  The adoption of this guidance did not have an impact on our consolidated statements of income or cash flows.  

Accounting Standard Update No.2017-12 - Derivatives and Hedging: Targeted Improvements to Accounting for Hedging Activities (“ASU 2017-12”). OnAugust 28, 2017, theFASB issuedanewstandardthatallowscompaniestobetteraligntheir hedgeaccountingandriskmanagementactivities. The new standard will also reducethe costandcomplexityofapplyinghedgeaccounting. Thestandardrequires companiestochangetherecognitionandpresentation oftheeffectsofhedge accountingby:

• Eliminating therequirementtoseparatelymeasureandreporthedge ineffectiveness;and

• Requiringcompaniestopresentalloftheelementsofhedgeaccounting thataffectearningsinthesameincomestatementlineasthehedgeditem.

The standard also permits hedge accounting for strategies for which hedge accounting was not historically permitted today and includes new alternatives for measuring the hedged item for fair value hedges of interest rate risk. Furthermore, the standard eases the requirements for effectiveness testing, hedge documentation, applying the critical terms match method, and introduces new alternatives that will permit companies to reduce the risk of material error corrections if they misapply the shortcut method. The new accounting standard is effective for fiscal years beginning after December 15, 2018, and interim periods within those fiscal years. Early adoption is permitted.

The new standard requires a modified retrospective transition method in which the Company will recognize the cumulative effect of the change on the opening balance of each affected component of equity in the statement of financial position as of the date of adoption. We are currently assessing the impact the adoption of this guidance will have on our consolidated balance sheets, statements of income, and cash flows.

Accounting Standards Update No. 2017-08 - Premium Amortization on Purchased Callable Debt Securities (“ASU 2017-08”). On March 30, 2017, the FASB issued guidance to amend the amortization period for certain purchased callable debt securities held at a premium. The new guidance requires entities to amortize premium on callable debt securities to the earliest call date.  Shortening the amortization period is generally expected to more closely align the interest income recognition with the expectations incorporated in the market pricing on the underlying securities. Under GAAP, entities generally amortize the premium as an adjustment of yield over the contractual life of the instrument. Debt securities held at a discount will continue to be amortized to maturity. The amended guidance is effective for fiscal years beginning after December 15, 2018 and interim periods within those fiscal years.  Early adoption is permitted. This guidance should be applied using a modified retrospective basis as of the beginning of the period of adoption. Additionally, in the period of adoption, we will provide disclosures about a change in accounting principle. We are currently assessing the impact the adoption of this guidance will have on our consolidated balance sheets, statements of income, and cash flows.

Accounting Standards Update No. 2017-07 - Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost (“ASU 2017-07”). On March 10, 2017, the FASB issued amended guidance primarily to improve the presentation of net periodic pension cost and net periodic postretirement benefit cost, as discussed below. The new guidance requires that an employer report the service cost component in the same line item or items as other compensation costs arising from services rendered by the pertinent employees during the period and all other components of net periodic benefit cost in a separate line item(s) in the statement of income. The other components of net benefit cost will be required to be presented in a separate line item. The guidance also specifies that only the service cost component will be eligible for capitalization. The amendments in this ASU are effective for fiscal years beginning after December 15, 2017.  The amendments in this ASU were applied retrospectively for the presentation of the service cost component and the other components of net periodic pension cost and net periodic postretirement benefit cost in the income statement.See Note 9 – Pension and Retirement Plans for the required disclosures and impact to the consolidated statements of income.  

Accounting Standards Update No. 2016-18 - Restricted Cash (“ASU 2016-18”).  On November 17, 2016, the FASB issued amended guidance to require that a statement of cash flows explain the change during the period in the total of cash, cash equivalents, and amounts generally described as restricted cash or restricted cash equivalents. Therefore, amounts generally described as restricted cash and restricted cash equivalents should be included with cash and cash equivalents when reconciling the beginning-of-period and end-of-period total amounts shown on the statement of cash flows. The Company adopted this standard on January 1, 2018 and it did not have an impact on our statement of cash flows.  

Accounting Standards Update No. 2016-15 - Classification of Certain Cash Receipts and Cash Payments (“ASU 2016-15”).On August 26, 2016, the FASB issued amendments to clarify guidance on the classification of certain cash receipts and payments in the statement of cash flows. This guidance is intended to reduce existing diversity in practice in how certain cash receipts and cash payments are presented and classified on the statement of cash flows. This guidance should be applied using a retrospective transition method to each period presented. The Company adopted this standard on January 1, 2018 and it did not have a material impact on our statement of cash flows.  

Accounting Standards Update No. 2016-13 - Financial Instruments - Measurement of Credit Losses on Financial Instruments (“ASU 2016-13”). On June 16, 2016, the FASB issued ASU 2016-13, which will significantly change how entities measure and recognize credit impairment for many financial assets. Under this standard, the new current expected credit loss model will require entities to immediately recognize an estimate of credit losses expected to occur over the remaining life of the financial assets that are in the scope of the standard. This new guidance also made targeted amendments to the current impairment model for available for sale debt securities. This guidance will be effective for the Company for the fiscal years beginning after December 15, 2019, including interim periods within those fiscal years. Early adoption for fiscal years and interim periods beginning after December 15, 2018 is permitted. We are in the process of evaluating this guidance and its effect on our consolidated balance sheets, statements of income, and cash flows. We are developing an implementation plan which will include assessment of processes, portfolio segmentation, model development, system requirements and the identification of data and resource needs to implement this standard. We are also evaluating third-party vendor solutions to assist us in implementing the requirements of ASU 2016-13.

Accounting Standards Update No. 2016-02 - Leases (“ASU 2016-02”). On February 25, 2016, the FASB issued guidance that requires recognition of lease assets and lease liabilities on the statement of condition and disclosure of key information about leasing arrangements. In particular, this guidance requires a lessee of operating or finance leases to recognize on the statement of condition a liability to make lease payments and a right-of-use asset representing its right to use the underlying asset for the lease term. However, for leases with a term of 12 months or less, a lessee is permitted to make an accounting policy election not to recognize lease assets and lease liabilities. Under previous GAAP, a lessee was not required to recognize lease assets and lease liabilities arising from operating leases on the statement of condition. The guidance becomes effective for the Company on January 1, 2019, and early adoption is permitted. We are currently assessing the impact the adoption of this guidance will have on our consolidated balance sheets, statements of income, and cash flows. We have created a project team responsible for identifying the population of leases, evaluating the required accounting changes, and developing the processes and procedures needed to implement ASU 2016-02.

Accounting Standards Update No. 2016-01 - Recognition and Measurement of Financial Assets and Financial Liabilities (“ASU 2016-01”). On January 5, 2016, the FASB issued amended guidance on certain aspects of recognition, measurement, presentation, and disclosure of financial instruments. This guidance includes, but is not limited to the following:

• Requires equity investments (with certain exceptions) to be measured at fair value with changes in fair value recognized in net income.

• Requires an entity to present separately in other comprehensive income 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.

• Requires 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 statement of condition or the accompanying notes to the financial statements.

• Clarifies that an entity must assess valuation allowances on a deferred tax asset related to available for sale debt securities in combination with its other deferred tax assets.

• Require public business entities to use the exit price notion when measuring the fair value of financial instruments for disclosure purposes.

• Eliminates the requirement for public entities 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 statement of condition.

The amendments, in general, are required to be applied by means of a cumulative-effect adjustment on the statement of condition as of the beginning of the period of adoption. The Company adopted the standard on January 1, 2018, and it did not have a material impact on our consolidated balance sheets, statements of income, or cash flows.  

Accounting Standards Update No. 2014-09 – Revenue from Contracts with Customers (“ASU 2014-09”) Topic 606. On May 28, 2014, the FASB issued Accounting Standards Update (“ASU”) No. 2014-09, “Revenue from Contracts with Customers,” which requires an entity to recognize the amount of revenue to which it expects to be entitled for the transfer of promised goods or services to customers. The new guidance supersedes current U.S. GAAP guidance on revenue recognition and requires the use of more estimates and judgments than the current revenue standards. Topic 606 does not apply to revenue associated with financial instruments, including revenue from loans and securities. In addition, certain noninterest income streams such as fees associated with mortgage servicing rights, financial guarantees, derivatives, and certain credit card fees are also not in scope of the new guidance.

On January 1, 2018, the Company adopted ASU No. 2014-09 and all subsequent ASUs that modified Topic 606. Topic 606 is applicable to noninterest revenue streams such as trust and asset management income, deposit related fees, interchange fees, and merchant income.

The Company completed its overall assessment of revenue streams and review of related contracts potentially affected by the ASU, including trust and asset management fees, deposit related fees and other income within noninterest income.

Based on this assessment, the Company concluded that ASU 2014-09 did not materially change the method in which the Company currently recognizes revenue for these revenue streams. The Company adopted ASU 2014-09 and its related amendments utilizing the modified retrospective approach. Since there was no net income impact upon adoption of the new guidance, a cumulative effect adjustment to opening retained earnings was not deemed necessary. Noninterest income considered in-scope of Topic 606 is discussed below.

Wealth management and trust fees

Wealth management fees are earned for providing investment management, retirement plan advisory, family office, and financial planning services to clients. The Company’s performance obligation under these contracts is satisfied over time as the wealth management services are provided. Fees are recognized monthly based on the average monthly value of the assets under management and the applicable fee rate, depending on the terms of the contract. No performance based incentives are earned on wealth management contracts. Receivables are recorded on the consolidated balance sheet in the other assets line item.

Trust fees are earned when the Company is appointed as trustee for clients. As trustee, the Company administers the client’s trust and manages the assets of the trust including investments and property. The Company’s performance obligation under these agreements is satisfied over time as the administration and management services are provided. Fees are recognized monthly based on a percentage of the market value of the account as outlined in the agreement. Receivables are recorded on the consolidated balance sheet in the other assets line item. The Company also earned fees for trust related activities. The Company’s performance obligation under these agreements is satisfied at a point in time and recognized when these services have been performed.

All of the wealth management and trust fee income on the consolidated statement of operations for the three months ended March 31, 2018 is considered in-scope of Topic 606.

Other banking fee income

The Company charges a variety of fees to its clients for services provided on the deposit and deposit management related accounts. Each fee is either transaction-based or assessed monthly. The types of fees include service charges on accounts, overdraft fees, wire transfer fees, maintenance fees, ATM fee charges, and other miscellaneous charges related to the accounts. These fees are not governed by individual contracts with clients. They are charges to clients based on disclosures presented to clients upon opening these accounts along with updated disclosures when changes are made to the fee structures. The transaction-based fees are recognized in revenue when charged to the client based on specific activity on the client’s account. Monthly service and maintenance charges are recognized in the month they are earned and are charged directly to the client’s account.

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Cash and Due from Banks

3 Months Ended

Mar. 31, 2018

Cash And Due From Banks [Abstract]

Cash and due from Banks

5. Cash and Due from Banks

At March 31, 2018 and December 31, 2017, cash and due from banks totaled $56.3 million and $103.6 million, respectively. Of this amount, $15.4 million and $12.8 million, respectively, were maintained to satisfy the reserve requirements of the Federal Reserve Bank of Boston (“FRB Boston”). Additionally, at March 31, 2018 and December 31, 2017, the Company pledged $500,000 to the New Hampshire Banking Department relating to Cambridge Trust Company of New Hampshire, Inc.’s operations in that state.

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Investment Securities

3 Months Ended

Mar. 31, 2018

Investments Debt And Equity Securities [Abstract]

Investment Securities

6. Investment Securities

Investment securities have been classified in the unaudited consolidated balance sheets according to management’s intent. The carrying amounts of securities and their approximate fair values were as follows:

	March 31, 2018									December 31, 2017
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value		Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
	(dollars in thousands)
Available for sale securities
U.S. GSE obligations	$	90,017	$	—	$	(1,594	)	$	88,423	$	90,021	$	—	$	(1,230	)	$	88,791
Mortgage-backed securities		107,874		205		(4,099	)		103,980		113,184		248		(2,806	)		110,626
Corporate debt securities		5,029		—		(84	)		4,945		5,034		12		(45	)		5,001
Mutual funds		587		—		—			587		672		—		(73	)		599
Total available for sale securities	$	203,507	$	205	$	(5,777	)	$	197,935	$	208,911	$	260	$	(4,154	)	$	205,017
Held to maturity securities
U.S. GSE obligations	$	32,572	$	—	$	(326	)	$	32,246	$	32,572	$	—	$	(166	)	$	32,406
Mortgage-backed securities		146,316		11		(2,411	)		143,916		117,155		7		(906	)		116,256
Corporate debt securities		6,966		—		(104	)		6,862		1,998		4		—			2,002
Municipal securities		78,555		1,383		(530	)		79,408		80,463		2,544		(117	)		82,890
Total held to maturity securities	$	264,409	$	1,394	$	(3,371	)	$	262,432	$	232,188	$	2,555	$	(1,189	)	$	233,554
Total	$	467,916	$	1,599	$	(9,148	)	$	460,367	$	441,099	$	2,815	$	(5,343	)	$	438,571

All of the Company’s mortgage-backed securities have been issued by, or are collateralized by securities issued by, either Government National Mortgage Association (Ginnie Mae), Federal National Mortgage Association (Fannie Mae), or Federal Home Loan Mortgage Corporation (Freddie Mac).

The following tables show the Company’s securities with gross unrealized losses aggregated by investment category and length of time that individual securities have been in a continuous loss position:

	March 31, 2018
	Less than 12 months					12 months or longer					Total
	Fair Value		Unrealized Losses			Fair Value		Unrealized Losses			Fair Value		Unrealized Losses
	(dollars in thousands)
Temporarily Impaired Securities
Available for sale securities
U.S. GSE obligations	$	—	$	—		$	88,423	$	(1,594	)	$	88,423	$	(1,594	)
Mortgage-backed securities		11,765		(360	)		89,052		(3,739	)		100,817		(4,099	)
Corporate debt securities		998		(2	)		3,947		(82	)		4,945		(84	)
Total available for sale securities	$	12,763	$	(362	)	$	181,422	$	(5,415	)	$	194,185	$	(5,777	)
Held to maturity securities
U.S. GSE obligations	$	32,246	$	(326	)	$	—	$	—		$	32,246	$	(326	)
Mortgage-backed securities		129,538		(2,375	)		3,778		(36	)		133,316		(2,411	)
Corporate debt securities		6,862		(104	)		—		—			6,862		(104	)
Municipal securities		14,218		(236	)		6,257		(294	)		20,475		(530	)
Total held to maturity securities	$	182,864	$	(3,041	)	$	10,035	$	(330	)	$	192,899	$	(3,371	)
Total temporarily impaired securities	$	195,627	$	(3,403	)	$	191,457	$	(5,745	)	$	387,084	$	(9,148	)

	December 31, 2017
	Less than 12 months					12 months or longer					Total
	Fair Value		Unrealized Losses			Fair Value		Unrealized Losses			Fair Value		Unrealized Losses
	(dollars in thousands)
Temporarily Impaired Securities
Available for sale securities
U.S. GSE obligations	$	4,979	$	(21	)	$	83,812	$	(1,209	)	$	88,791	$	(1,230	)
Mortgage-backed securities		12,526		(157	)		94,663		(2,649	)		107,189		(2,806	)
Corporate debt securities		—		—			3,990		(45	)		3,990		(45	)
Mutual funds		—		—			599		(73	)		599		(73	)
Total available for sale securities	$	17,505	$	(178	)	$	183,064	$	(3,976	)	$	200,569	$	(4,154	)
Held to maturity securities
U.S. GSE obligations	$	27,407	$	(166	)	$	—	$	—		$	27,407	$	(166	)
Mortgage-backed securities		115,926		(906	)		3		—			115,929		(906	)
Corporate debt securities		—		—			—		—			—		—
Municipal securities		2,041		(19	)		6,459		(98	)		8,500		(117	)
Total held to maturity securities	$	145,374	$	(1,091	)	$	6,462	$	(98	)	$	151,836	$	(1,189	)
Total temporarily impaired securities	$	162,879	$	(1,269	)	$	189,526	$	(4,074	)	$	352,405	$	(5,343	)

Management evaluates securities for other-than-temporary impairment on at least a quarterly basis, and more frequently, when economic or market conditions warrant such evaluation. Consideration is given to: (1) the length of time and the extent to which the fair value has been less than cost; (2) the financial condition and near-term prospects of the issuer; and (3) the intent and ability of the Company to retain its investment in the issuer for a period of time sufficient to allow for any anticipated recovery in fair value.

As of March 31, 2018, 151 debt securities had gross unrealized losses, with an aggregate depreciation of 2.31% from the Company’s amortized cost basis. The largest unrealized loss percentage of any single security was 9.25%, or $46,000 of its amortized cost. The largest unrealized dollar loss of any single security was $237,000, or 4.74% of its amortized cost.

As of December 31, 2017, 118 debt securities and one equity security had gross unrealized losses, with an aggregate depreciation of 1.49% from the Company’s amortized cost basis. The largest unrealized loss percentage of any single security was 10.90%, or $73,000 of its amortized cost. The largest unrealized dollar loss of any single security was $185,000, or 3.71% of its amortized cost.  

The Company believes that the nature and duration of impairment on its debt security positions are primarily a function of interest rate movements and changes in investment spreads, and does not consider full repayment of principal on the reported debt obligations to be at risk. Since nearly all of these securities are rated “investment grade” and (a) the Company does not intend to sell these securities before recovery and (b) that it is more likely than not that the Company will not be required to sell these securities before recovery, the Company does not consider these securities to be other-than-temporarily impaired as of March 31, 2018 and December 31, 2017.

The amortized cost and fair value of debt securities, aggregated by the earlier of guaranteed call date or contractual maturity, are shown below. Maturities of mortgage-backed securities do not take into consideration scheduled amortization or prepayments. 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.

	Within One Year				After One, But Within Five Years				After Five, But Within Ten Years				After Ten Years				Total
	Amortized Cost		Fair Value		Amortized Cost		Fair Value		Amortized Cost		Fair Value		Amortized Cost		Fair Value		Amortized Cost		Fair Value
At March 31, 2018	(dollars in thousands)
Available for sale securities
U.S. GSE obligations	$	20,017	$	19,897	$	70,000	$	68,526	$	—	$	—	$	—	$	—	$	90,017	$	88,423
Mortgage-backed securities		40		40		116		120		38,868		37,492		68,850		66,328		107,874		103,980
Corporate debt securities		—		—		5,029		4,945		—		—		—		—		5,029		4,945
Total available for sale    securities	$	20,057	$	19,937	$	75,145	$	73,591	$	38,868	$	37,492	$	68,850	$	66,328	$	202,920	$	197,348
Held to maturity securities
U.S. GSE obligations	$	5,004	$	4,970	$	27,568	$	27,276	$	—	$	—	$	—	$	—	$	32,572	$	32,246
Mortgage-backed securities		3		3		190		192		34,891		34,384		111,232		109,337		146,316		143,916
Corporate debt securities		—		—		6,966		6,862		—		—		—		—		6,966		6,862
Municipal securities		4,326		4,364		12,611		12,835		35,076		35,604		26,542		26,605		78,555		79,408
Total held to maturity    securities	$	9,333	$	9,337	$	47,335	$	47,165	$	69,967	$	69,988	$	137,774	$	135,942	$	264,409	$	262,432
Total	$	29,390	$	29,274	$	122,480	$	120,756	$	108,835	$	107,480	$	206,624	$	202,270	$	467,329	$	459,780

The following table sets forth information regarding sales of investment securities and the resulting gains (losses) from such sales:

	Three Months Ended March 31,
	2018		2017
	(dollars in thousands)
Amortized cost of securities sold	$	—	$	32,703
Gain/(loss) realized on securities sold		—		(2	)
Net proceeds from securities sold	$	—	$	32,701

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Loans and the Allowance for Loan Losses

3 Months Ended

Mar. 31, 2018

Receivables [Abstract]

Loans and the Allowance for Loan Losses

7. LOANS AND THE ALLOWANCE FOR LOAN LOSSES

The Company’s lending activities are conducted principally in Eastern Massachusetts. The Company grants single- and multi-family residential loans, commercial & industrial (“C&I”), commercial real estate (“CRE”), construction loans, and a variety of consumer loans.  Most of the loans granted by the Company are secured by real estate collateral. Repayment of the Company’s residential loans are generally dependent on the health of the employment market in the borrowers’ geographic areas and that of the general economy with liquidation of the underlying real estate collateral being typically viewed as the primary source of repayment in the event of borrower default. The repayment of C&I loans depends primarily on the cash flow and credit worthiness of the borrower and secondarily on the underlying collateral provided by the borrower.  As borrower cash flow may be difficult to predict, liquidation of the underlying collateral securing these loans is typically viewed as the primary source of repayment in the event of borrower default.  However, collateral typically consists of equipment, inventory, accounts receivable, or other business assets that may fluctuate in value, so the liquidation of collateral in the event of default is often an insufficient source of repayment. The Company’s CRE loans are primarily made based on the cash flow from the collateral property and secondarily on the underlying collateral provided by the borrower, with liquidation of the underlying real estate collateral typically being viewed as the primary source of repayment in the event of borrower default. The Company’s construction loans are primarily made based on the borrower’s expected ability to execute and the future completed value of the collateral property, with sale of the underlying real estate collateral typically being viewed as the primary source of repayment.

Loans outstanding are detailed by category as follows:

	March 31, 2018		December 31, 2017
	(dollars in thousands)
Residential mortgage
Mortgages - fixed rate	$	299,182	$	298,851
Mortgages - adjustable rate		241,330		239,027
Deferred costs net of unearned fees		1,087		1,042
Total residential mortgages		541,599		538,920
Commercial mortgage
Mortgages - nonowner occupied		584,414		562,203
Mortgages - owner occupied		40,050		35,343
Construction		31,585		35,904
Deferred costs net of unearned fees		240		199
Total commercial mortgages		656,289		633,649
Home equity
Home equity - lines of credit		66,889		70,326
Home equity - term loans		4,452		3,863
Deferred costs net of unearned fees		251		255
Total home equity		71,592		74,444
Commercial & industrial
Commercial & industrial		75,354		65,305
Deferred costs (fees) net of unearned fees		11		(10	)
Total commercial & industrial		75,365		65,295
Consumer
Secured		35,705		37,272
Unsecured		1,188		1,303
Deferred costs net of unearned fees		16		16
Total consumer		36,909		38,591
Total loans	$	1,381,754	$	1,350,899

Directors and officers of the Company and their associates are customers of, and have other transactions with, the Company in the normal course of business. All loans and commitments included in such transactions were made on substantially the same terms, including interest rates and collateral, as those prevailing at the time for comparable transactions with other persons and do not involve more than normal risk of collection or present other unfavorable features.

At March 31, 2018 and December 31, 2017, total loans outstanding to such directors and officers were $429,000 and $516,000, respectively. During the three months ended March 31, 2018, $6,000 of additions and $93,000 of repayments were made to these loans. There were $124,000 of additions and $298,000 of repayments during the year ended December 31, 2017. At March 31, 2018 and December 31, 2017, all of the loans to directors and officers were performing according to their original terms.

The following tables set forth information regarding non-performing loans disaggregated by loan category:

	March 31, 2018
	Residential Mortgages		Commercial Mortgages		Home Equity		Commercial & Industrial		Consumer		Total
	(dollars in thousands)
Non-performing loans:
Non-accrual loans	$	1,177	$	213	$	15	$	—	$	—	$	1,405
Loans past due >90 days, but still accruing		—		—		—		—		—		—
Troubled debt restructurings		119		—		—		23		—		142
Total	$	1,296	$	213	$	15	$	23	$	—	$	1,547

	December 31, 2017
	Residential Mortgages		Commercial Mortgages		Home Equity		Commercial & Industrial		Consumer		Total
	(dollars in thousands)
Non-performing loans:
Non-accrual loans	$	918	$	213	$	17	$	—	$	—	$	1,148
Loans past due >90 days, but still accruing		—		—		—		—		—		—
Troubled debt restructurings		121		—		—		29		—		150
Total	$	1,039	$	213	$	17	$	29	$	—	$	1,298

Troubled Debt Restructurings (“TDRs”)

Loans are considered restructured in a troubled debt restructuring when the Company has granted concessions to a borrower due to the borrower’s financial condition that it otherwise would not have considered. These concessions may include modifications of the terms of the debt such as deferral of payments, extension of maturity, reduction of principal balance, reduction of the stated interest rate other than normal market rate adjustments, or a combination of these concessions. Debt may be bifurcated with separate terms for each tranche of the restructured debt. Restructuring a loan in lieu of aggressively enforcing the collection of the loan may benefit the Company by increasing the ultimate probability of collection.

Restructured loans are classified as accruing or non-accruing based on management’s assessment of the collectability of the loan. Loans which are already on nonaccrual status at the time of the restructuring generally remain on nonaccrual status for approximately six months or longer before management considers such loans for return to accruing status. Accruing restructured loans are placed into nonaccrual status if and when the borrower fails to comply with the restructured terms and management deems it unlikely that the borrower will return to a status of compliance in the near term.

Troubled debt restructurings are classified as impaired loans. The Company identifies loss allocations for impaired loans on an individual loan basis.

There were no new TDRs during the three months ended March 31, 2018. At March 31, 2018, three loans were determined to be TDRs with a total carrying value of $142,000. There were no TDR defaults during the three months ended March 31, 2018.

During the year ended December 31, 2017, the Company modified one loan with a pre-modification carrying value (which consists of the unpaid principal balance, net of charge-offs and unamortized deferred loan origination fees and costs, at the time of the restructuring) of $65,000 and a post-modification carrying value of $48,000. At December 31, 2017, this loan had a carrying value of $29,000. At December 31, 2017, three loans were determined to be TDRs with a total carrying value of $150,000. Two loans designated as TDRs were charged-off during the fourth quarter of 2017.  There were no TDR defaults during the year ended December 31, 2017.

There were no specific allowances for TDRs at March 31, 2018 and December 31, 2017.

As of March 31, 2018, there were no significant commitments to lend additional funds to borrowers whose loans were restructured.

Loans by Credit Quality Indicator.  The following tables contain period-end balances of loans receivable disaggregated by credit quality indicator:

	March 31, 2018
	Residential Mortgages		Home Equity		Consumer
	(dollars in thousands)
Credit risk profile based on payment activity:
Performing	$	540,303	$	71,577	$	36,909
Non-performing		1,296		15		—
Total	$	541,599	$	71,592	$	36,909
			Commercial Mortgages		Commercial & Industrial
Credit risk profile by internally assigned grade:
1-6 (Pass)			$	651,366	$	67,033
7 (Special Mention)				4,710		7,991
8 (Substandard)				213		341
9 (Doubtful)				—		—
10 (Loss)				—		—
Total			$	656,289	$	75,365

	December 31, 2017
	Residential Mortgages		Home Equity		Consumer
	(dollars in thousands)
Credit risk profile based on payment activity:
Performing	$	537,881	$	74,427	$	38,591
Non-performing		1,039		17		—
Total	$	538,920	$	74,444	$	38,591
			Commercial Mortgages		Commercial & Industrial
Credit risk profile by internally assigned grade:
1-6 (Pass)			$	629,852	$	56,755
7 (Special Mention)				3,584		8,126
8 (Substandard)				213		414
9 (Doubtful)				—		—
10 (Loss)				—		—
Total			$	633,649	$	65,295

With respect to residential mortgages, home equity, and consumer loans, the Bank utilizes the following categories as indicators of credit quality:

• Performing – These loans are accruing and are considered having low to moderate risk.

• Non-performing – These loans either have been placed on non-accrual, or are past due more than 90 days but are still accruing, and may contain greater than average risk.

With respect to commercial real estate mortgages and commercial loans, the Bank utilizes a 10 grade internal loan rating system as an indicator of credit quality. The grades are as follows:

• Loans rated 1-6 (Pass) – These loans are considered “pass” rated with low to moderate risk.

• Loans rated 7 (Special Mention) – These loans have potential weaknesses warranting close attention, which, if left uncorrected, may result in deterioration of the credit at some future date.

• Loans rated 8 (Substandard) – These loans have well-defined weaknesses that jeopardize the orderly liquidation of the debt under the original loan terms. Loss potential exists but is not identifiable in any one customer.

• Loans rated 9 (Doubtful) – These loans have pronounced weaknesses that make full collection highly questionable and improbable.

• Loans rated 10 (Loss) – These loans are considered uncollectible and continuance as a bankable asset is not warranted.

Delinquencies

The past due status of a loan is determined in accordance with its contractual repayment terms. All loan types are reported past due when one scheduled payment is due and unpaid for 30 days or more. Loan delinquencies can be attributed to many factors, such as but not limited to a continuing weakness in, or deteriorating economic conditions in, the region in which the collateral is located, the loss of a tenant or lower lease rates for commercial borrowers, or the loss of income for consumers and the resulting liquidity impacts on the borrowers.

The following tables contain period-end balances of loans receivable disaggregated by past due status:

	March 31, 2018
	30-59 Days Past Due		60-89 Days Past Due		90 Days or Greater		Total Past Due		Current Loans		Total
	(dollars in thousands)
Residential Mortgages	$	1,908	$	423	$	686	$	3,017	$	538,582	$	541,599
Commercial Mortgages		—		—		213		213		656,076		656,289
Home Equity		44		—		—		44		71,548		71,592
Commercial & Industrial		25		—		—		25		75,340		75,365
Consumer loans		3		12		—		15		36,894		36,909
Total	$	1,980	$	435	$	899	$	3,314	$	1,378,440	$	1,381,754

	December 31, 2017
	30-59 Days Past Due		60-89 Days Past Due		90 Days or Greater		Total Past Due		Current Loans		Total
	(dollars in thousands)
Residential Mortgages	$	1,353	$	706	$	64	$	2,123	$	536,797	$	538,920
Commercial Mortgages		—		32		—		32		633,617		633,649
Home Equity		1		—		17		18		74,426		74,444
Commercial & Industrial		—		—		—		—		65,295		65,295
Consumer loans		176		—		—		176		38,415		38,591
Total	$	1,530	$	738	$	81	$	2,349	$	1,348,550	$	1,350,899

There were no significant commitments to lend additional funds to borrowers whose loans were on nonaccrual status at March 31, 2018 and December 31, 2017.

Foreclosure proceedings

As of March 31, 2018 and December 31, 2017, loans secured by one- to four-family residential property amounting to $63,000 and $64,000, respectively, were in process of foreclosure.

Impaired Loans

Impaired loans are loans for which it is probable that the Company will not be able to collect all amounts due according to the contractual terms of the loan agreements and loans restructured in a troubled debt restructuring. The recorded investment in impaired loans consists of unpaid principal balance, net of charge-offs, interest payments received applied to principal and unamortized deferred loan origination fees and costs.  

The following tables present information pertaining to impaired loans:

	For the Three Months Ended March 31, 2018
	Carrying Value		Average Carrying Value		Unpaid Principal Balance		Related Allowance		Interest Income Recognized
	(dollars in thousands)
With no required reserve recorded:
Commercial and industrial	$	23	$	25	$	23	$	—	$	—
Commercial mortgage		213		213		227		—		—
Residential mortgage		1,157		1,164		1,360		—		—
Home equity		68		69		99		—		—
Total		1,461		1,471		1,709		—		—
With required reserve recorded:
Commercial and industrial		—		—		—		—		—
Commercial mortgage		—		—		—		—		—
Residential mortgage		63		63		63		90		—
Home equity		—		—		—		—		—
Total		63		63		63		90		—
Total:
Commercial and industrial		23		25		23		—		—
Commercial mortgage		213		213		227		—		—
Residential mortgage		1,220		1,227		1,423		90		—
Home equity		68		69		99		—		—
Total	$	1,524	$	1,534	$	1,772	$	90	$	—

	For the Three Months Ended March 31, 2017
	Carrying Value		Average Carrying Value		Unpaid Principal Balance		Related Allowance		Interest Income Recognized
	(dollars in thousands)
With no required reserve recorded:
Commercial and industrial	$	—	$	—	$	—	$	—	$	—
Commercial mortgage		232		232		232		—		—
Residential mortgage		693		701		874		—
Home equity		100		101		126		—		—
Consumer		—		—		—		—		—
Total		1,025		1,034		1,232		—		—
With required reserve recorded:
Commercial and industrial		283		285		291		108		—
Commercial mortgage		—		—		—		—		—
Residential mortgage		315		317		315		200		—
Home equity		—		—		—		—		—
Total		598		602		606		308		—
Total:
Commercial and industrial		283		285		291		108		—
Commercial mortgage		232		232		232		—		—
Residential mortgage		1,008		1,018		1,189		200		—
Home equity		100		101		126		—		—
Consumer		—		—		—		—		—
Total	$	1,623	$	1,636	$	1,838	$	308	$	—

Allowance for Loan Losses  

The Company maintains an allowance for loan losses in an amount determined by management on the basis of the character of the loans, loan performance, financial condition of borrowers, the value of collateral securing loans, and other relevant factors. We provide for loan losses based upon the consistent application of our documented allowance for loan loss methodology. All loan losses are charged to the allowance for loan losses and all recoveries are credited to it. Additions to the allowance for loan losses are provided by charges to income based on various factors which, in our judgment, deserve current recognition in estimating probable losses. We regularly review the loan portfolio, including a review of our classified assets, and make provisions for loan losses in order to maintain the allowance for loan losses in accordance with GAAP. The allowance for loan losses consists primarily of two components:

1. Specific allowances established for impaired loans, as defined by GAAP. The amount of impairment provided for as a specific allowance is measured based on the deficiency, if any, between the present value of expected future cash flows discounted at the loan’s effective interest rate at the time of impairment or, as a practical expedient, at the loan’s observable market price, or the fair value of the collateral if the loan is collateral-dependent, and the carrying value of the loan; and

2. General allowances established for loan losses on a portfolio basis for loans that do not meet the definition of impaired loans. The portfolio is grouped into homogenous pools by similar risk characteristics, primarily by loan type and regulatory classification. We apply an estimated incurred loss rate to each loan group. The loss rates applied are based upon our historical loss experience over a designated look back period adjusted, as appropriate, for the quantitative, qualitative, and environmental factors discussed below. This evaluation is inherently subjective, as it requires material estimates that may be susceptible to significant revisions based upon changes in economic and real estate market conditions.

Actual loan losses may be significantly more than the allowance for loan losses we have established, which could have a material negative effect on our financial results.

The adjustments to historical loss experience are based on our evaluation of several quantitative, qualitative, and environmental factors, including:

• the loss emergence period, which represents the average amount of time between when loss events occur for specific loan types and when such problem loans are identified and the related loss amounts are confirmed through charge-offs;

• changes in any concentration of credit (including, but not limited to, concentrations by geography, industry, or collateral type);

• changes in the number and amount of non-accrual loans and past due loans;

• changes in national, state, and local economic trends;

• changes in the types of loans in the loan portfolio;

• changes in the experience and ability of personnel;

• changes in lending strategies; and

• changes in lending policies and procedures.

In addition, we may establish an unallocated allowance to provide for probable losses that have been incurred as of the reporting date but are not reflected in the allocated allowance.

We evaluate the allowance for loan losses based upon the combined total of the specific and general components. Generally, when the loan portfolio increases, absent other factors, the allowance for loan loss methodology results in a higher dollar amount of estimated probable losses than would be the case without the increase. Generally, when the loan portfolio decreases, absent other factors, the allowance for loan losses methodology results in a lower dollar amount of estimated probable losses than would be the case without the decrease. Periodically, management conducts an analysis to estimate the loss emergence period for various loan categories based on samples of historical charge-offs. Model output by loan category is reviewed to evaluate the reasonableness of the reserve levels in comparison to the estimated loss emergence period applied to historical loss experience.

We evaluate the loan portfolio on a quarterly basis, and the allowance is adjusted accordingly. While we use the best information available to make evaluations, future adjustments to the allowance may be necessary if conditions differ substantially from the information used in making the evaluations. In addition, various regulatory agencies, as an integral part of their examination process, will periodically review the allowance for loan losses. Such agencies may require us to recognize additions to the allowance based on their analysis of information available to them at the time of their examination.

The following tables contain changes in the allowance for loan losses disaggregated by loan category :

	For the Three Months Ended March 31, 2018
	Residential Mortgages			Commercial Mortgages		Home Equity			Commercial & Industrial			Consumer			Impaired			Total
	(dollars in thousands)
Allowance for loan losses:
Balance at December 31, 2017	$	5,047		$	8,289	$	630		$	946		$	315		$	93		$	15,320
Charge-offs		—			—		—			(5	)		(5	)		—			(10	)
Recoveries		—			—		—			11			2			—			13
Provision		(355	)		648		(60	)		193			(14	)		(3	)		409
Balance at March 31, 2018	$	4,692		$	8,937	$	570		$	1,145		$	298		$	90		$	15,732

	For the Three Months Ended March 31, 2017
	Residential Mortgages			Commercial Mortgages		Home Equity			Commercial & Industrial			Consumer			Impaired		Total
	(dollars in thousands)
Allowance for loan losses:
Balance at December 31, 2016	$	4,898		$	8,451	$	651		$	807		$	264		$	190	$	15,261
Charge-offs		—			—		—			—			(7	)		—		(7	)
Recoveries		—			—		—			3			2			—		5
Provision		(86	)		175		(35	)		(152	)		10			118		30
Balance at March 31, 2017	$	4,812		$	8,626	$	616		$	658		$	269		$	308	$	15,289

The following tables contain period-end balances of the allowance for loan losses and related loans receivable disaggregated by impairment method:

	March 31, 2018
	Residential Mortgages		Commercial Mortgages		Home Equity		Commercial & Industrial		Consumer		Total
	(dollars in thousands)
Allowance for loan losses
Individually evaluated for impairment	$	90	$	—	$	—	$	—	$	—	$	90
Collectively evaluated for impairment		4,692		8,937		570		1,145		298		15,642
Total	$	4,782	$	8,937	$	570	$	1,145	$	298	$	15,732
Loans receivable
Individually evaluated for impairment	$	1,220	$	213	$	68	$	23	$	—	$	1,524
Collectively evaluated for impairment		540,379		656,076		71,524		75,342		36,909		1,380,230
Total	$	541,599	$	656,289	$	71,592	$	75,365	$	36,909	$	1,381,754

	December 31, 2017
	Residential Mortgages		Commercial Mortgages		Home Equity		Commercial & Industrial		Consumer		Total
	(dollars in thousands)
Allowance for loan losses
Individually evaluated for impairment	$	93	$	—	$	—	$	—	$	—	$	93
Collectively evaluated for impairment		5,047		8,289		630		946		315		15,227
Total	$	5,140	$	8,289	$	630	$	946	$	315	$	15,320
Loans receivable
Individually evaluated for impairment	$	968	$	213	$	86	$	29	$	—	$	1,296
Collectively evaluated for impairment		537,952		633,436		74,358		65,266		38,591		1,349,603
Total	$	538,920	$	633,649	$	74,444	$	65,295	$	38,591	$	1,350,899

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Income Taxes

3 Months Ended

Mar. 31, 2018

Income Tax Disclosure [Abstract]

Income Taxes

8. Income Taxes

In accordance with the Tax Cuts and Jobs Act of 2017, the Company’s federal tax rate reduced from 35% to 21% effective January 1, 2018. The effective tax rate was 21.8% for the quarter ended March 31, 2018, as compared to 31.4% for the quarter ended March 31, 2017.

Net deferred tax assets totaled $7.9 million at March 31, 2018 and $8.3 million at December 31, 2017. The Company recorded no valuation allowance for deferred tax assets at March 31, 2018.

The components of income tax expense were as follows:

	Three Months Ended March 31,
	2018		2017
	(dollars in thousands)
Current
Federal	$	593	$	932
State		253		234
Total current expense		846		1,166
Deferred
Federal		524		637
State		246		181
Total deferred		770		818
Total income tax expense	$	1,616	$	1,984

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Pension and Retirement Plans

3 Months Ended

Mar. 31, 2018

Compensation And Retirement Disclosure [Abstract]

Pension and Retirement Plans

9. Pension and Retirement Plans

The components of net periodic benefit cost (credit) were as follows:

	Three Months Ended March 31,
	Pension Plan						Supplemental Retirement Plan				Retirement Healthcare Plan
	2018			2017			2018		2017		2018		2017
	(dollars in thousands)
Net periodic benefit cost
Service cost	$	—		$	447		$	89	$	67	$	6	$	4
Interest cost		386			545			77		91		5		5
Expected return on assets		(723	)		(818	)		—		—		—		—
Amortization of prior service cost (credit)		(1	)		(1	)		—		—		—		—
Amortization of net actuarial loss		16			237			1		—		5		(2	)
Net periodic benefit cost (credit)	$	(322	)	$	410		$	167	$	158	$	16	$	7

The Company made no contributions to the qualified defined benefit pension plan during the three months ended March 31, 2018. We do not expect to make any contributions to the qualified defined benefit plan during the remainder of 2018.

The Company adopted Accounting Standards Update No. 2017-07 - Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost (“ASU 2017-07”) on January 1, 2018.  ASU 2017-07 requires that an employer report the service cost component in the same line item or items as other compensation costs arising from services rendered by the pertinent employees during the period and all other components of net periodic benefit cost in a separate line item(s) on the consolidated statements of income. The components of net periodic pension cost other than the service cost components are included in other expenses.  

Employee Profit Sharing Plan

The Company maintains a Profit Sharing Plan (“PSP”) that provides for deferral of federal and state income taxes on employee contributions allowed under Section 401(k) of federal law. The PSP plan was amended effective January 1, 2018.  The Company matches employee contributions up to 100% of the first 4% of each participant’s salary, up from 3% in 2017.  Each year, the Company may also make a discretionary contribution to the PSP. It is anticipated that the Company will make a discretionary contribution to the Plan of 4% of eligible compensation for plan participants. Employees are eligible to participate in the PSP on the first day of their initial date of service.  Additionally, employees will be eligible to participate in the discretionary contribution portion of the PSP if employed by the Company on the last day of the plan year.

Employee Stock Ownership Plan

The Company has an Employee Stock Ownership Plan (“ESOP”) for its eligible employees. Employees are eligible to participate upon the attainment of age 21 and the completion of 12 months of service consisting of at least 1,000 hours. The Company may make a discretionary contribution to the ESOP on an annual basis.  Shares of the Company’s common stock can then be purchased and allocated to eligible participant accounts at the then quoted market price.  Participants can elect to have cash dividends paid during the year re-invested to purchase additional shares.  

Total expenses related to the PSP and ESOP for the three months ended March 31, 2018 and March 31, 2017 amounted to approximately $823,000 and $238,000, respectively.

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Stock Based Compensation

3 Months Ended

Mar. 31, 2018

Share Based Compensation [Abstract]

Stock Based Compensation

10. STOCK BASED COMPENSATION

Time Vested Restricted Stock Awards (RSAs) and Restricted Stock Units (RSUs)

During the three months ended March 31, 2018, the Company issued the following RSAs and RSUs from the 2017 Equity and Cash Incentive Plan.  The fair value of RSAs and RSUs is based upon the Company’s common stock closing share price on the date of the grant. The holders of RSAs participate fully in the rewards of stock ownership of the Company, including voting and dividend rights.

		Weighted-
		Average
Shares Granted		Fair Value at Grant Date		Type of Award
	11,838	$	76.71	RSAs
	7,839	$	76.56	RSUs

Performance-Based Restricted Stock Units

On January 22, 2018, the Company granted 23,511 performance-based restricted stock units. These performance-based restricted stock units were issued from the 2017 Equity and Cash Incentive Plan and had a grant date fair value per share of $76.56, as determined by the closing price on grant date. Performance-based restricted stock units are subject to a 3-year performance period and will be earned based on Return on Assets and diluted Earnings Per Share growth performance as compared to the Company’s peer group.  

The following table presents the pre-tax expense associated with all outstanding non-vested RSAs, RSUs, performance based restricted stock units, and the related tax benefits recognized:

	Three Months Ended March 31,
	2018		2017
	(dollars in thousands)
Stock based compensation expense	$	540	$	273
Related tax benefits	$	152	$	112

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Financial Instruments with Off-Balance-Sheet Risk

3 Months Ended

Mar. 31, 2018

Fair Value Disclosures [Abstract]

Financial Instruments with Off-Balance-Sheet Risk

11. Financial Instruments with Off-Balance-Sheet Risk

To meet the financing needs of its customers, the Company is a party to financial instruments with off-balance-sheet risk in the normal course of business. These financial instruments are primarily comprised of commitments to extend credit, commitments to sell residential mortgage loans, derivatives contracts, risk participation agreements, and standby letters of credit. Those instruments involve, to varying degrees, elements of credit and interest rate risk in excess of the amounts recognized in the consolidated balance sheets.

The Company’s exposure to credit loss in the event of nonperformance by the other party to the financial instrument for loan commitments and standby letters of credit is represented by the contractual amount of those instruments assuming that the amounts are fully advanced and that collateral, or other security, is of no value. The Company uses the same credit policies in making commitments and conditional obligations as it does for on-balance-sheet instruments.

Off-balance-sheet financial instruments with contractual amounts that present credit risk include the following:

	March 31, 2018		December 31, 2017
	(dollars in thousands)
Financial instruments whose contractual amount    represents credit risk:
Commitments to extend credit:
Unused portion of existing lines of credit	$	313,313	$	304,298
Origination of new loans		34,392		45,061
Standby letters of credit		8,669		8,322
Financial instruments whose notional amount exceeds    the amount of credit risk:
Commitments to sell residential mortgage loans		1,124		1,490
Customer related derivative contracts:
Interest rate swaps with customers		78,967		74,758
Mirror swaps with counterparties		78,967		74,758
Risk participation agreements with counterparties		39,095		38,494

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Shareholders' Equity

3 Months Ended

Mar. 31, 2018

Equity [Abstract]

Shareholders’ Equity

12. Shareholders’ Equity

As of March 31, 2018 and December 31, 2017, the Company and the Bank met all applicable minimum capital requirements and were considered “well-capitalized” by both the FRB and the FDIC.  

	Actual					Minimum Capital Required For Capital Adequacy					Minimum Capital Required For Capital Adequacy Plus Capital Conservation Buffer Basel III Phase-In Schedule					Minimum Capital Required For Capital Adequacy Plus Capital Conservation Buffer Basel III Fully Phased In					Minimum To Be Well-Capitalized Under Prompt Corrective Action Provisions
	Amount		Ratio			Amount		Ratio			Amount		Ratio			Amount		Ratio			Amount		Ratio
	(dollars in thousands)
At March 31, 2018
Cambridge Bancorp:
Total capital (to risk-weighted    assets)	$	174,684		13.9	%	$	100,692		8.0	%	$	124,292		9.875	%	$	132,159		10.5	%	N/A		N/A
Tier I capital (to risk-weighted    assets)		158,950		12.6	%		75,519		6.0	%		99,119		7.875	%		106,986		8.5	%	N/A		N/A
Common equity tier I capital    (to risk-weighted assets)		158,950		12.6	%		56,639		4.5	%		80,239		6.375	%		88,106		7.0	%	N/A		N/A
Tier I capital (to average    assets)		158,950		8.1	%		78,043		4.0	%		78,043		4.000	%		78,043		4.0	%	N/A		N/A
Cambridge Trust Company:
Total capital (to risk-weighted    assets)	$	170,546		13.5	%	$	100,692		8.0	%	$	124,292		9.875	%	$	132,159		10.5	%	$	125,866		10.0	%
Tier I capital (to risk-weighted    assets)		154,812		12.3	%		75,519		6.0	%		99,119		7.875	%		106,986		8.5	%		100,692		8.0	%
Common equity tier I capital    (to risk-weighted assets)		154,812		12.3	%		56,639		4.5	%		80,239		6.375	%		88,106		7.0	%		81,813		6.5	%
Tier I capital (to average    assets)		154,812		7.9	%		78,043		4.0	%		78,043		4.000	%		78,043		4.0	%		97,554		5.0	%
At December 31, 2017
Cambridge Bancorp:
Total capital (to risk-weighted    assets)	$	168,615		13.7	%	$	98,136		8.0	%	$	113,470		9.25	%	$	128,804		10.5	%	N/A		N/A
Tier I capital (to risk-weighted    assets)		153,281		12.5	%		73,602		6.0	%		88,936		7.25	%		104,270		8.5	%	N/A		N/A
Common equity tier I capital    (to risk-weighted assets)		153,281		12.5	%		55,202		4.5	%		70,535		5.75	%		85,869		7.0	%	N/A		N/A
Tier I capital (to average    assets)		153,281		8.1	%		76,026		4.0	%		76,026		4.00	%		76,026		4.0	%	N/A		N/A
Cambridge Trust Company:
Total capital (to risk-weighted    assets)	$	164,880		13.4	%	$	98,136		8.0	%	$	113,470		9.25	%	$	128,804		10.5	%	$	122,670		10.0	%
Tier I capital (to risk-weighted    assets)		149,546		12.2	%		73,602		6.0	%		88,936		7.25	%		104,270		8.5	%		98,136		8.0	%
Common equity tier I capital    (to risk-weighted assets)		149,546		12.2	%		55,202		4.5	%		70,535		5.75	%		85,869		7.0	%		79,736		6.5	%
Tier I capital (to average    assets)		149,546		7.9	%		76,026		4.0	%		76,026		4.00	%		76,026		4.0	%		95,033		5.0	%

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Other Comprehensive Income

3 Months Ended

Mar. 31, 2018

Equity [Abstract]

Other Comprehensive Income

13. Other Comprehensive Income

The following table presents the changes in accumulated other comprehensive income (loss) during the period, by component, net of tax:

	Three Months Ended March 31, 2018									Three Months Ended March 31, 2017
	Before Tax Amount			Tax (Expense) or Benefit			Net-of-tax Amount			Before Tax Amount		Tax (Expense) or Benefit			Net-of-tax Amount
	(dollars in thousands)
Unrealized gains/(losses) on available for sale securities
Unrealized holding gains/(losses) arising during period	$	(1,678	)	$	326		$	(1,352	)	$	292	$	(103	)	$	189
Reclassification adjustment for (gains)/losses recognized in net income		—			—			—			2		(1	)		1
Defined benefit retirement plans
Change in retirement liability		14			(4	)		10			224		(92	)		132
Total Other Comprehensive Income (Loss)	$	(1,664	)	$	322		$	(1,342	)	$	518	$	(196	)	$	322

Reclassifications out of Accumulated Other Comprehensive Income (“AOCI”) that have an impact on net income are presented below:

Three Months Ended March 31,
Details about Accumulated Other Comprehensive Income Components	2018		2017			Affected Line Item in the Statement where Net Income is Presented
	(dollars in thousands)
Unrealized gains and losses on available    for sale securities	$	—	$	(2	)	(Loss) gain on disposition of    investment securities
Tax benefit or (expense)		—		1		Provision for income taxes
Net of tax	$	—	$	(1	)	Net income

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Earnings Per Share

3 Months Ended

Mar. 31, 2018

Earnings Per Share [Abstract]

Earnings Per Share

14. Earnings per Share

The following represents a reconciliation between basic and diluted earnings per share:

	Three Months Ended March 31,
	2018			2017
	(dollars in thousands, except per share data)
Earnings per common share - basic:
Numerator:
Net income	$	5,805		$	4,328
Less dividends and undistributed earnings allocated    to participating securities		(64	)		(47	)
Net income applicable to common shareholders	$	5,741		$	4,281
Denominator:
Weighted average common shares outstanding		4,053			4,012
Earnings per common share - basic	$	1.42		$	1.07
Earnings per common share - diluted:
Numerator:
Net income	$	5,805		$	4,328
Less dividends and undistributed earnings allocated    to participating securities		(64	)		(47	)
Net income applicable to common shareholders	$	5,741		$	4,281
Denominator:
Weighted average common shares outstanding		4,053			4,012
Dilutive effect of common stock equivalents		19			39
Weighted average diluted common shares outstanding		4,072			4,051
Earnings per common share - diluted	$	1.41		$	1.06

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Derivative Financial Instruments

3 Months Ended

Mar. 31, 2018

Derivative Instruments Not Designated As Hedging Instruments [Abstract]

Derivative Financial Instruments

15. Derivative Financial Instruments

The Company enters into interest rate derivatives to accommodate the business requirements of its customers. Derivatives are recognized as either assets or liabilities on the balance sheet and are measured at fair value.  The accounting for changes in the fair value of derivatives depends on the intended use of the derivative and resulting designation.

Interest Rate Swaps

The Company has entered into interest rate swap contracts to help commercial loan borrowers manage their interest rate risk. The interest rate swap contracts with commercial loan borrowers allow them to convert floating-rate loan payments to fixed-rate loan payments. When the Bank enters into an interest rate swap contract with a commercial loan borrower, it simultaneously enters into a “mirror” swap contract with a third party. The third party exchanges the client’s fixed‑rate loan payments for floating-rate loan payments. 

As of March 31, 2018 and December 31, 2017, the Bank had interest rate swap contracts with commercial loan borrowers with notional amounts of $79.0 million and $74.8 million, respectively, and equal amounts of “mirror” swap contracts with third-party financial institutions. These derivatives are not designated as hedges and therefore, changes in fair value are recognized in earnings. Because these derivatives have mirror-image contractual terms, the changes in fair value substantially offset each other through earnings. Fees earned in connection with the execution of derivatives related to this program are recognized in earnings through loan related derivative income.

The credit risk associated with swap transactions is the risk of default by the counterparty. To minimize this risk, the Company enters into interest rate agreements only with highly rated counterparties that management believes to be creditworthy. The notional amounts of these agreements do not represent amounts exchanged by the parties under a collateral pledging agreement, and, thus, are not a measure of the potential loss exposure.

Risk Participation Agreements

The Company has entered into risk participation agreements (“RPAs”) with other banks participating in commercial loan arrangements. Participating banks guarantee the performance on borrower-related interest rate swap contracts. RPAs are derivative financial instruments and are recorded at fair value and reported in other assets or other liabilities. These derivatives are not designated as hedges, and therefore, changes in fair value are recognized in earnings with a corresponding offset within other liabilities.

Under a risk participation-out agreement (a derivative asset), the Company participates out a portion of the credit risk associated with the interest rate swap position executed with the commercial borrower for a fee paid to the participating bank. Under a risk participation-in agreement (a derivative liability), the Company assumes, or participates in, a portion of the credit risk associated with the interest rate swap position with the commercial borrower for a fee received from the other bank.

As of March 31, 2018, the notional amounts of the risk participation-in agreements and risk participation-out agreements were $39.1 million and $0, respectively.  As of December 31, 2017, the notional amounts of the risk participation-in agreements and risk participation-out agreements were $38.5 million and $0, respectively.

The following table presents the fair values of derivative instruments in the Company’s unaudited consolidated balance sheets:

		Derivative Assets					Derivative Liabilities
	Balance Sheet Location	March 31, 2018		December 31, 2017		Balance Sheet Location	March 31, 2018		December 31, 2017
		(dollars in thousands)					(dollars in thousands)
Derivatives not Designated as Hedging Instruments
Loan related derivative contracts
Interest rate swaps with customers	Other Assets	$	3,253	$	1,859	Other Liabilities	$	—	$	—
Mirror swaps with counterparties	Other Assets		—		—	Other Liabilities		3,253		1,859
Risk participation agreements	Other Assets		—		—	Other Liabilities		54		81
Total		$	3,253	$	1,859		$	3,307	$	1,940

For the three months ended March 31, 2018 and March 31, 2017, the Company recorded $472,000 and $188,000, respectively, of loan related derivative income.

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Fair Value Measurements

3 Months Ended

Mar. 31, 2018

Fair Value Disclosures [Abstract]

Fair Value Measurements

16. Fair Value Measurements

The Company follows ASC 820, “Fair Value Measurements and Disclosures,” for financial assets and liabilities. ASC 820 defines fair value, establishes a framework for measuring fair value, and expands disclosure requirements about fair value measurements. ASC 820, among other things, emphasizes that fair value is a market-based measurement, not an entity-specific measurement, and states that a fair value measurement should be determined based on the assumptions the market participants would use in pricing the asset or liability. In addition, ASC 820 specifies a hierarchy of valuation techniques based on whether the types of valuation information (“inputs”) are observable or unobservable. Observable inputs reflect market data obtained from independent sources, while unobservable inputs reflect the Company’s market assumptions. These two types of inputs have created the following fair value hierarchy:

• Level 1 – Quoted prices for identical assets or liabilities in active markets.

• Level 2 – Quoted prices for similar assets or liabilities in active markets; quoted prices for identical or similar assets or liabilities in inactive markets; and model-derived valuations in which all significant inputs and significant value drivers are observable in active markets.

• Level 3 – Valuations derived from techniques in which one or more significant inputs or significant value drivers are unobservable in the markets and which reflect the Company’s market assumptions.

The Company uses fair value measurements to record fair value adjustments to certain assets and liabilities and to determine fair value disclosures. Securities available for sale, derivative instruments, and hedges are recorded at fair value on a recurring basis. Additionally, from time to time, the Company may be required to record at fair value other assets on a nonrecurring basis, such as collateral dependent impaired loans.

In accordance with the requirements of ASU 2016-01, the Company uses an exit price notion for its fair value disclosures as of March 31, 2018.

The following is a summary of the carrying values and estimated fair values of the Company’s significant financial instruments as of the dates indicated:

	March 31, 2018				December 31, 2017
	Carrying Value		Estimated Fair Value		Carrying Value		Estimated Fair Value
	(dollars in thousands)
Financial assets
Cash and cash equivalents	$	56,265	$	56,265	$	103,591	$	103,591
Securities available for sale		197,935		197,935		205,017		205,017
Securities held to maturity		264,409		262,432		232,188		233,554
Loans, net		1,366,022		1,320,509		1,335,579		1,304,719
Loans held for sale		—		—		—		—
FHLB Boston stock		4,242		4,242		4,242		4,242
Bank owned life insurance		30,535		30,535		31,083		31,083
Accrued interest receivable		5,059		5,059		5,128		5,128
Mortgage servicing rights		760		1,049		793		1,049
Loan level interest rate swaps		3,253		3,253		1,859		1,859
Financial liabilities
Deposits		1,782,392		1,779,459		1,775,400		1,772,838
Short-term borrowings		—		—		—		—
Long-term borrowings		3,537		3,486		3,579		3,559
Loan level interest rate swaps		3,253		3,253		1,859		1,859
Risk participation agreements		54		54		81		81

The following tables summarize certain assets reported at fair value on a recurring basis:

	Fair Value as of March 31, 2018
	Level 1		Level 2		Level 3		Total
	(dollars in thousands)
Measured on a recurring basis
Securities available for sale
U.S. GSE obligations	$	—	$	88,423	$	—	$	88,423
Mortgage-backed securities		—		103,980		—		103,980
Corporate debt securities		—		4,945		—		4,945
Mutual funds		587		—		—		587
Other assets
Interest rate swaps with customers		—		3,253		—		3,253
Other liabilities
Mirror swaps with counterparties		—		3,253		—		3,253
Risk participation agreements		—		54		—		54

	Fair Value as of December 31, 2017
	Level 1		Level 2		Level 3		Total
	(dollars in thousands)
Measured on a recurring basis
Securities available for sale
U.S. GSE obligations	$	—	$	88,791	$	—	$	88,791
Mortgage-backed securities		—		110,626		—		110,626
Corporate debt securities		—		5,001		—		5,001
Mutual funds		599		—		—		599
Other assets
Interest rate swaps with customers		—		1,859		—		1,859
Other liabilities
Mirror swaps with counterparties		—		1,859		—		1,859
Risk participation agreements		—		81		—		81

There were no assets measured at fair value on a non-recurring basis during the quarter ended March 31, 2018 and at December 31, 2017.

There were no transfers between levels for the three months ended March 31, 2018 and the three months ended March 31, 2017.  

The following is a description of the principal valuation methodologies used by the Company to estimate the fair values of its financial instruments.

Investment Securities

For investment securities, fair values are primarily based upon valuations obtained from a national pricing service which uses matrix pricing with inputs that are observable in the market or can be derived from, or corroborated by, observable market data. When available, quoted prices in active markets for identical securities are utilized.

Loans Held for Sale

For loans held for sale, fair values are estimated using projected future cash flows, discounted at rates based upon either trades of similar loans or mortgage-backed securities, or at current rates at which similar loans would be made to borrowers with similar credit ratings and for similar remaining maturities.

Loans

For most categories of loans, fair values are estimated using projected future cash flows, discounted at rates based upon current rates at which similar loans would be made to borrowers with similar credit ratings, and for similar remaining maturities. Projected estimated cash flows are adjusted for prepayment assumptions, liquidity premium assumptions, and credit loss assumptions. Loans that are deemed to be impaired in accordance with ASC 310, “Receivables,” are valued based upon the lower of cost or fair value of the underlying collateral.

FHLB of Boston Stock

The fair value of FHLB of Boston stock equals its carrying value since such stock is only redeemable at its par value.

Deposits

The fair value of non-maturity deposit accounts is the amount payable on demand at the reporting date. This amount does not take into account the value of the Bank’s long-term relationships with core depositors. The fair value of fixed-maturity certificates of deposit is estimated using a replacement cost of funds approach and is based upon rates currently offered for deposits of similar remaining maturities.

Long-Term Borrowings

For long-term borrowings, fair values are estimated using future cash flows, discounted at rates based upon current costs for debt securities with similar terms and remaining maturities.

Other Financial Assets and Liabilities

Cash and cash equivalents, accrued interest receivable, and short-term borrowings have fair values which approximate their respective carrying values because these instruments are payable on demand or have short-term maturities and present relatively low credit risk and interest rate risk.

Derivative Instruments and Hedges

The valuation of these instruments is determined using widely accepted valuation techniques including discounted cash flow analysis on the expected cash flows of each derivative. This analysis reflects the contractual terms of the derivatives, including the period to maturity, and uses observable market-based inputs, including interest rate curves and implied volatilities. The Bank incorporates credit valuation adjustments to appropriately reflect nonperformance risk in the fair value measurements. In adjusting the fair value of its derivative contracts for the effect of nonperformance risk, the Bank has considered the impact of netting and any applicable credit enhancements, such as collateral postings.

Off-Balance-Sheet Financial Instruments

In the course of originating loans and extending credit, the Bank will charge fees in exchange for its commitment. While these commitment fees have value, the Bank has not estimated their value due to the short-term nature of the underlying commitments and their immateriality.

Values Not Determined

In accordance with ASC 820, the Company has not estimated fair values for non-financial assets such as banking premises and equipment, goodwill, the intangible value of the Bank’s portfolio of loans serviced for itself, and the intangible value inherent in the Bank’s deposit relationships (i.e., core deposits), among others. Accordingly, the aggregate fair value amounts presented do not represent the underlying value of the Company.

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Basis of Presentation (Policies)

3 Months Ended

Mar. 31, 2018

Accounting Policies [Abstract]

Use of Estimates

2. 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 disclosure of contingent assets and liabilities at the date of the financial statements. Actual results could differ from those estimates. The allowance for loan losses, the fair values of financial instruments, and the valuation of deferred tax assets are particularly subject to change.

Recently Issued and Adopted Accounting Guidance

Recently Issued and Adopted Accounting Guidance

Accounting Standards Update No. 2018-02 - Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income (“ASU 2018-02”). On February 14, 2018, the Financial Accounting Standards Board (the “FASB”) issued amended guidance to address certain stranded income tax effects in accumulated other comprehensive income (“AOCI”) resulting from the Tax Cuts and Jobs Act. The ASU requires the following:

• A description of the accounting policy for releasing income tax effects from AOCI,

• Whether we elect to reclassify the stranded income tax effects from the Tax Cuts and Jobs Act, and

• Information about the other income tax effects that are reclassified.

The amendments in this ASU affect any organization that is required to apply the provisions of Topic 220, Income Statement—Reporting Comprehensive Income, and has items of other comprehensive income for which the related tax effects are presented in accumulated other comprehensive income, as required by GAAP. ASU 2018-02 is effective for the Company’s reporting period beginning on January 1, 2019; early adoption is permitted. The Company elected to early adopt ASU 2018-02 during the first quarter of 2018, and reclassed $1.3 million from AOCI to retained earnings in the period of adoption on the consolidated balance sheet, with zero net effect on total shareholders’ equity. This amount represents the difference in the Company’s current federal tax rate of 21% and the previous rate of 35%.  The adoption of this guidance did not have an impact on our consolidated statements of income or cash flows.  

Accounting Standard Update No.2017-12 - Derivatives and Hedging: Targeted Improvements to Accounting for Hedging Activities (“ASU 2017-12”). OnAugust 28, 2017, theFASB issuedanewstandardthatallowscompaniestobetteraligntheir hedgeaccountingandriskmanagementactivities. The new standard will also reducethe costandcomplexityofapplyinghedgeaccounting. Thestandardrequires companiestochangetherecognitionandpresentation oftheeffectsofhedge accountingby:

• Eliminating therequirementtoseparatelymeasureandreporthedge ineffectiveness;and

• Requiringcompaniestopresentalloftheelementsofhedgeaccounting thataffectearningsinthesameincomestatementlineasthehedgeditem.

The standard also permits hedge accounting for strategies for which hedge accounting was not historically permitted today and includes new alternatives for measuring the hedged item for fair value hedges of interest rate risk. Furthermore, the standard eases the requirements for effectiveness testing, hedge documentation, applying the critical terms match method, and introduces new alternatives that will permit companies to reduce the risk of material error corrections if they misapply the shortcut method. The new accounting standard is effective for fiscal years beginning after December 15, 2018, and interim periods within those fiscal years. Early adoption is permitted.

The new standard requires a modified retrospective transition method in which the Company will recognize the cumulative effect of the change on the opening balance of each affected component of equity in the statement of financial position as of the date of adoption. We are currently assessing the impact the adoption of this guidance will have on our consolidated balance sheets, statements of income, and cash flows.

Accounting Standards Update No. 2017-08 - Premium Amortization on Purchased Callable Debt Securities (“ASU 2017-08”). On March 30, 2017, the FASB issued guidance to amend the amortization period for certain purchased callable debt securities held at a premium. The new guidance requires entities to amortize premium on callable debt securities to the earliest call date.  Shortening the amortization period is generally expected to more closely align the interest income recognition with the expectations incorporated in the market pricing on the underlying securities. Under GAAP, entities generally amortize the premium as an adjustment of yield over the contractual life of the instrument. Debt securities held at a discount will continue to be amortized to maturity. The amended guidance is effective for fiscal years beginning after December 15, 2018 and interim periods within those fiscal years.  Early adoption is permitted. This guidance should be applied using a modified retrospective basis as of the beginning of the period of adoption. Additionally, in the period of adoption, we will provide disclosures about a change in accounting principle. We are currently assessing the impact the adoption of this guidance will have on our consolidated balance sheets, statements of income, and cash flows.

Accounting Standards Update No. 2017-07 - Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost (“ASU 2017-07”). On March 10, 2017, the FASB issued amended guidance primarily to improve the presentation of net periodic pension cost and net periodic postretirement benefit cost, as discussed below. The new guidance requires that an employer report the service cost component in the same line item or items as other compensation costs arising from services rendered by the pertinent employees during the period and all other components of net periodic benefit cost in a separate line item(s) in the statement of income. The other components of net benefit cost will be required to be presented in a separate line item. The guidance also specifies that only the service cost component will be eligible for capitalization. The amendments in this ASU are effective for fiscal years beginning after December 15, 2017.  The amendments in this ASU were applied retrospectively for the presentation of the service cost component and the other components of net periodic pension cost and net periodic postretirement benefit cost in the income statement.See Note 9 – Pension and Retirement Plans for the required disclosures and impact to the consolidated statements of income.  

Accounting Standards Update No. 2016-18 - Restricted Cash (“ASU 2016-18”).  On November 17, 2016, the FASB issued amended guidance to require that a statement of cash flows explain the change during the period in the total of cash, cash equivalents, and amounts generally described as restricted cash or restricted cash equivalents. Therefore, amounts generally described as restricted cash and restricted cash equivalents should be included with cash and cash equivalents when reconciling the beginning-of-period and end-of-period total amounts shown on the statement of cash flows. The Company adopted this standard on January 1, 2018 and it did not have an impact on our statement of cash flows.  

Accounting Standards Update No. 2016-15 - Classification of Certain Cash Receipts and Cash Payments (“ASU 2016-15”).On August 26, 2016, the FASB issued amendments to clarify guidance on the classification of certain cash receipts and payments in the statement of cash flows. This guidance is intended to reduce existing diversity in practice in how certain cash receipts and cash payments are presented and classified on the statement of cash flows. This guidance should be applied using a retrospective transition method to each period presented. The Company adopted this standard on January 1, 2018 and it did not have a material impact on our statement of cash flows.  

Accounting Standards Update No. 2016-13 - Financial Instruments - Measurement of Credit Losses on Financial Instruments (“ASU 2016-13”). On June 16, 2016, the FASB issued ASU 2016-13, which will significantly change how entities measure and recognize credit impairment for many financial assets. Under this standard, the new current expected credit loss model will require entities to immediately recognize an estimate of credit losses expected to occur over the remaining life of the financial assets that are in the scope of the standard. This new guidance also made targeted amendments to the current impairment model for available for sale debt securities. This guidance will be effective for the Company for the fiscal years beginning after December 15, 2019, including interim periods within those fiscal years. Early adoption for fiscal years and interim periods beginning after December 15, 2018 is permitted. We are in the process of evaluating this guidance and its effect on our consolidated balance sheets, statements of income, and cash flows. We are developing an implementation plan which will include assessment of processes, portfolio segmentation, model development, system requirements and the identification of data and resource needs to implement this standard. We are also evaluating third-party vendor solutions to assist us in implementing the requirements of ASU 2016-13.

Accounting Standards Update No. 2016-02 - Leases (“ASU 2016-02”). On February 25, 2016, the FASB issued guidance that requires recognition of lease assets and lease liabilities on the statement of condition and disclosure of key information about leasing arrangements. In particular, this guidance requires a lessee of operating or finance leases to recognize on the statement of condition a liability to make lease payments and a right-of-use asset representing its right to use the underlying asset for the lease term. However, for leases with a term of 12 months or less, a lessee is permitted to make an accounting policy election not to recognize lease assets and lease liabilities. Under previous GAAP, a lessee was not required to recognize lease assets and lease liabilities arising from operating leases on the statement of condition. The guidance becomes effective for the Company on January 1, 2019, and early adoption is permitted. We are currently assessing the impact the adoption of this guidance will have on our consolidated balance sheets, statements of income, and cash flows. We have created a project team responsible for identifying the population of leases, evaluating the required accounting changes, and developing the processes and procedures needed to implement ASU 2016-02.

Accounting Standards Update No. 2016-01 - Recognition and Measurement of Financial Assets and Financial Liabilities (“ASU 2016-01”). On January 5, 2016, the FASB issued amended guidance on certain aspects of recognition, measurement, presentation, and disclosure of financial instruments. This guidance includes, but is not limited to the following:

• Requires equity investments (with certain exceptions) to be measured at fair value with changes in fair value recognized in net income.

• Requires an entity to present separately in other comprehensive income 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.

• Requires 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 statement of condition or the accompanying notes to the financial statements.

• Clarifies that an entity must assess valuation allowances on a deferred tax asset related to available for sale debt securities in combination with its other deferred tax assets.

• Require public business entities to use the exit price notion when measuring the fair value of financial instruments for disclosure purposes.

• Eliminates the requirement for public entities 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 statement of condition.

The amendments, in general, are required to be applied by means of a cumulative-effect adjustment on the statement of condition as of the beginning of the period of adoption. The Company adopted the standard on January 1, 2018, and it did not have a material impact on our consolidated balance sheets, statements of income, or cash flows.  

Accounting Standards Update No. 2014-09 – Revenue from Contracts with Customers (“ASU 2014-09”) Topic 606. On May 28, 2014, the FASB issued Accounting Standards Update (“ASU”) No. 2014-09, “Revenue from Contracts with Customers,” which requires an entity to recognize the amount of revenue to which it expects to be entitled for the transfer of promised goods or services to customers. The new guidance supersedes current U.S. GAAP guidance on revenue recognition and requires the use of more estimates and judgments than the current revenue standards. Topic 606 does not apply to revenue associated with financial instruments, including revenue from loans and securities. In addition, certain noninterest income streams such as fees associated with mortgage servicing rights, financial guarantees, derivatives, and certain credit card fees are also not in scope of the new guidance.

On January 1, 2018, the Company adopted ASU No. 2014-09 and all subsequent ASUs that modified Topic 606. Topic 606 is applicable to noninterest revenue streams such as trust and asset management income, deposit related fees, interchange fees, and merchant income.

The Company completed its overall assessment of revenue streams and review of related contracts potentially affected by the ASU, including trust and asset management fees, deposit related fees and other income within noninterest income.

Based on this assessment, the Company concluded that ASU 2014-09 did not materially change the method in which the Company currently recognizes revenue for these revenue streams. The Company adopted ASU 2014-09 and its related amendments utilizing the modified retrospective approach. Since there was no net income impact upon adoption of the new guidance, a cumulative effect adjustment to opening retained earnings was not deemed necessary. Noninterest income considered in-scope of Topic 606 is discussed below.

Wealth management and trust fees

Wealth management fees are earned for providing investment management, retirement plan advisory, family office, and financial planning services to clients. The Company’s performance obligation under these contracts is satisfied over time as the wealth management services are provided. Fees are recognized monthly based on the average monthly value of the assets under management and the applicable fee rate, depending on the terms of the contract. No performance based incentives are earned on wealth management contracts. Receivables are recorded on the consolidated balance sheet in the other assets line item.

Trust fees are earned when the Company is appointed as trustee for clients. As trustee, the Company administers the client’s trust and manages the assets of the trust including investments and property. The Company’s performance obligation under these agreements is satisfied over time as the administration and management services are provided. Fees are recognized monthly based on a percentage of the market value of the account as outlined in the agreement. Receivables are recorded on the consolidated balance sheet in the other assets line item. The Company also earned fees for trust related activities. The Company’s performance obligation under these agreements is satisfied at a point in time and recognized when these services have been performed.

All of the wealth management and trust fee income on the consolidated statement of operations for the three months ended March 31, 2018 is considered in-scope of Topic 606.

Other banking fee income

The Company charges a variety of fees to its clients for services provided on the deposit and deposit management related accounts. Each fee is either transaction-based or assessed monthly. The types of fees include service charges on accounts, overdraft fees, wire transfer fees, maintenance fees, ATM fee charges, and other miscellaneous charges related to the accounts. These fees are not governed by individual contracts with clients. They are charges to clients based on disclosures presented to clients upon opening these accounts along with updated disclosures when changes are made to the fee structures. The transaction-based fees are recognized in revenue when charged to the client based on specific activity on the client’s account. Monthly service and maintenance charges are recognized in the month they are earned and are charged directly to the client’s account.

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Investment Securities (Tables)

3 Months Ended

Mar. 31, 2018

Investments Debt And Equity Securities [Abstract]

Summary of Carrying Amounts of Securities and Their Approximate Fair Values

Investment securities have been classified in the unaudited consolidated balance sheets according to management’s intent. The carrying amounts of securities and their approximate fair values were as follows:

	March 31, 2018									December 31, 2017
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value		Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
	(dollars in thousands)
Available for sale securities
U.S. GSE obligations	$	90,017	$	—	$	(1,594	)	$	88,423	$	90,021	$	—	$	(1,230	)	$	88,791
Mortgage-backed securities		107,874		205		(4,099	)		103,980		113,184		248		(2,806	)		110,626
Corporate debt securities		5,029		—		(84	)		4,945		5,034		12		(45	)		5,001
Mutual funds		587		—		—			587		672		—		(73	)		599
Total available for sale securities	$	203,507	$	205	$	(5,777	)	$	197,935	$	208,911	$	260	$	(4,154	)	$	205,017
Held to maturity securities
U.S. GSE obligations	$	32,572	$	—	$	(326	)	$	32,246	$	32,572	$	—	$	(166	)	$	32,406
Mortgage-backed securities		146,316		11		(2,411	)		143,916		117,155		7		(906	)		116,256
Corporate debt securities		6,966		—		(104	)		6,862		1,998		4		—			2,002
Municipal securities		78,555		1,383		(530	)		79,408		80,463		2,544		(117	)		82,890
Total held to maturity securities	$	264,409	$	1,394	$	(3,371	)	$	262,432	$	232,188	$	2,555	$	(1,189	)	$	233,554
Total	$	467,916	$	1,599	$	(9,148	)	$	460,367	$	441,099	$	2,815	$	(5,343	)	$	438,571

Gross Unrealized Losses of Aggregated by Investment Category and Length of Time that Individual Securities have been in Continuous Loss Position

The following tables show the Company’s securities with gross unrealized losses aggregated by investment category and length of time that individual securities have been in a continuous loss position:

	March 31, 2018
	Less than 12 months					12 months or longer					Total
	Fair Value		Unrealized Losses			Fair Value		Unrealized Losses			Fair Value		Unrealized Losses
	(dollars in thousands)
Temporarily Impaired Securities
Available for sale securities
U.S. GSE obligations	$	—	$	—		$	88,423	$	(1,594	)	$	88,423	$	(1,594	)
Mortgage-backed securities		11,765		(360	)		89,052		(3,739	)		100,817		(4,099	)
Corporate debt securities		998		(2	)		3,947		(82	)		4,945		(84	)
Total available for sale securities	$	12,763	$	(362	)	$	181,422	$	(5,415	)	$	194,185	$	(5,777	)
Held to maturity securities
U.S. GSE obligations	$	32,246	$	(326	)	$	—	$	—		$	32,246	$	(326	)
Mortgage-backed securities		129,538		(2,375	)		3,778		(36	)		133,316		(2,411	)
Corporate debt securities		6,862		(104	)		—		—			6,862		(104	)
Municipal securities		14,218		(236	)		6,257		(294	)		20,475		(530	)
Total held to maturity securities	$	182,864	$	(3,041	)	$	10,035	$	(330	)	$	192,899	$	(3,371	)
Total temporarily impaired securities	$	195,627	$	(3,403	)	$	191,457	$	(5,745	)	$	387,084	$	(9,148	)

	December 31, 2017
	Less than 12 months					12 months or longer					Total
	Fair Value		Unrealized Losses			Fair Value		Unrealized Losses			Fair Value		Unrealized Losses
	(dollars in thousands)
Temporarily Impaired Securities
Available for sale securities
U.S. GSE obligations	$	4,979	$	(21	)	$	83,812	$	(1,209	)	$	88,791	$	(1,230	)
Mortgage-backed securities		12,526		(157	)		94,663		(2,649	)		107,189		(2,806	)
Corporate debt securities		—		—			3,990		(45	)		3,990		(45	)
Mutual funds		—		—			599		(73	)		599		(73	)
Total available for sale securities	$	17,505	$	(178	)	$	183,064	$	(3,976	)	$	200,569	$	(4,154	)
Held to maturity securities
U.S. GSE obligations	$	27,407	$	(166	)	$	—	$	—		$	27,407	$	(166	)
Mortgage-backed securities		115,926		(906	)		3		—			115,929		(906	)
Corporate debt securities		—		—			—		—			—		—
Municipal securities		2,041		(19	)		6,459		(98	)		8,500		(117	)
Total held to maturity securities	$	145,374	$	(1,091	)	$	6,462	$	(98	)	$	151,836	$	(1,189	)
Total temporarily impaired securities	$	162,879	$	(1,269	)	$	189,526	$	(4,074	)	$	352,405	$	(5,343	)

Schedule of Amortized Cost and Fair Value of Debt Securities, Aggregated By Earlier of Guaranteed Call Date or Contractual Maturity

The amortized cost and fair value of debt securities, aggregated by the earlier of guaranteed call date or contractual maturity, are shown below. Maturities of mortgage-backed securities do not take into consideration scheduled amortization or prepayments. 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.

	Within One Year				After One, But Within Five Years				After Five, But Within Ten Years				After Ten Years				Total
	Amortized Cost		Fair Value		Amortized Cost		Fair Value		Amortized Cost		Fair Value		Amortized Cost		Fair Value		Amortized Cost		Fair Value
At March 31, 2018	(dollars in thousands)
Available for sale securities
U.S. GSE obligations	$	20,017	$	19,897	$	70,000	$	68,526	$	—	$	—	$	—	$	—	$	90,017	$	88,423
Mortgage-backed securities		40		40		116		120		38,868		37,492		68,850		66,328		107,874		103,980
Corporate debt securities		—		—		5,029		4,945		—		—		—		—		5,029		4,945
Total available for sale    securities	$	20,057	$	19,937	$	75,145	$	73,591	$	38,868	$	37,492	$	68,850	$	66,328	$	202,920	$	197,348
Held to maturity securities
U.S. GSE obligations	$	5,004	$	4,970	$	27,568	$	27,276	$	—	$	—	$	—	$	—	$	32,572	$	32,246
Mortgage-backed securities		3		3		190		192		34,891		34,384		111,232		109,337		146,316		143,916
Corporate debt securities		—		—		6,966		6,862		—		—		—		—		6,966		6,862
Municipal securities		4,326		4,364		12,611		12,835		35,076		35,604		26,542		26,605		78,555		79,408
Total held to maturity    securities	$	9,333	$	9,337	$	47,335	$	47,165	$	69,967	$	69,988	$	137,774	$	135,942	$	264,409	$	262,432
Total	$	29,390	$	29,274	$	122,480	$	120,756	$	108,835	$	107,480	$	206,624	$	202,270	$	467,329	$	459,780

Summary of Gains (Losses) from Sale of Investment Securities

The following table sets forth information regarding sales of investment securities and the resulting gains (losses) from such sales:

	Three Months Ended March 31,
	2018		2017
	(dollars in thousands)
Amortized cost of securities sold	$	—	$	32,703
Gain/(loss) realized on securities sold		—		(2	)
Net proceeds from securities sold	$	—	$	32,701

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Loans and the Allowance for Loan Losses (Tables)

3 Months Ended

Mar. 31, 2018

Receivables [Abstract]

Loans Outstanding by Category

Loans outstanding are detailed by category as follows:

	March 31, 2018		December 31, 2017
	(dollars in thousands)
Residential mortgage
Mortgages - fixed rate	$	299,182	$	298,851
Mortgages - adjustable rate		241,330		239,027
Deferred costs net of unearned fees		1,087		1,042
Total residential mortgages		541,599		538,920
Commercial mortgage
Mortgages - nonowner occupied		584,414		562,203
Mortgages - owner occupied		40,050		35,343
Construction		31,585		35,904
Deferred costs net of unearned fees		240		199
Total commercial mortgages		656,289		633,649
Home equity
Home equity - lines of credit		66,889		70,326
Home equity - term loans		4,452		3,863
Deferred costs net of unearned fees		251		255
Total home equity		71,592		74,444
Commercial & industrial
Commercial & industrial		75,354		65,305
Deferred costs (fees) net of unearned fees		11		(10	)
Total commercial & industrial		75,365		65,295
Consumer
Secured		35,705		37,272
Unsecured		1,188		1,303
Deferred costs net of unearned fees		16		16
Total consumer		36,909		38,591
Total loans	$	1,381,754	$	1,350,899

Non-performing Loans Disaggregated by Loan Category

The following tables set forth information regarding non-performing loans disaggregated by loan category:

	March 31, 2018
	Residential Mortgages		Commercial Mortgages		Home Equity		Commercial & Industrial		Consumer		Total
	(dollars in thousands)
Non-performing loans:
Non-accrual loans	$	1,177	$	213	$	15	$	—	$	—	$	1,405
Loans past due >90 days, but still accruing		—		—		—		—		—		—
Troubled debt restructurings		119		—		—		23		—		142
Total	$	1,296	$	213	$	15	$	23	$	—	$	1,547

	December 31, 2017
	Residential Mortgages		Commercial Mortgages		Home Equity		Commercial & Industrial		Consumer		Total
	(dollars in thousands)
Non-performing loans:
Non-accrual loans	$	918	$	213	$	17	$	—	$	—	$	1,148
Loans past due >90 days, but still accruing		—		—		—		—		—		—
Troubled debt restructurings		121		—		—		29		—		150
Total	$	1,039	$	213	$	17	$	29	$	—	$	1,298

Loans Receivable Disaggregated by Credit Quality Indicator

.  The following tables contain period-end balances of loans receivable disaggregated by credit quality indicator:

	March 31, 2018
	Residential Mortgages		Home Equity		Consumer
	(dollars in thousands)
Credit risk profile based on payment activity:
Performing	$	540,303	$	71,577	$	36,909
Non-performing		1,296		15		—
Total	$	541,599	$	71,592	$	36,909
			Commercial Mortgages		Commercial & Industrial
Credit risk profile by internally assigned grade:
1-6 (Pass)			$	651,366	$	67,033
7 (Special Mention)				4,710		7,991
8 (Substandard)				213		341
9 (Doubtful)				—		—
10 (Loss)				—		—
Total			$	656,289	$	75,365

	December 31, 2017
	Residential Mortgages		Home Equity		Consumer
	(dollars in thousands)
Credit risk profile based on payment activity:
Performing	$	537,881	$	74,427	$	38,591
Non-performing		1,039		17		—
Total	$	538,920	$	74,444	$	38,591
			Commercial Mortgages		Commercial & Industrial
Credit risk profile by internally assigned grade:
1-6 (Pass)			$	629,852	$	56,755
7 (Special Mention)				3,584		8,126
8 (Substandard)				213		414
9 (Doubtful)				—		—
10 (Loss)				—		—
Total			$	633,649	$	65,295

Schedule of Loans Receivable Disaggregated by Past Due Status

The following tables contain period-end balances of loans receivable disaggregated by past due status:

	March 31, 2018
	30-59 Days Past Due		60-89 Days Past Due		90 Days or Greater		Total Past Due		Current Loans		Total
	(dollars in thousands)
Residential Mortgages	$	1,908	$	423	$	686	$	3,017	$	538,582	$	541,599
Commercial Mortgages		—		—		213		213		656,076		656,289
Home Equity		44		—		—		44		71,548		71,592
Commercial & Industrial		25		—		—		25		75,340		75,365
Consumer loans		3		12		—		15		36,894		36,909
Total	$	1,980	$	435	$	899	$	3,314	$	1,378,440	$	1,381,754

	December 31, 2017
	30-59 Days Past Due		60-89 Days Past Due		90 Days or Greater		Total Past Due		Current Loans		Total
	(dollars in thousands)
Residential Mortgages	$	1,353	$	706	$	64	$	2,123	$	536,797	$	538,920
Commercial Mortgages		—		32		—		32		633,617		633,649
Home Equity		1		—		17		18		74,426		74,444
Commercial & Industrial		—		—		—		—		65,295		65,295
Consumer loans		176		—		—		176		38,415		38,591
Total	$	1,530	$	738	$	81	$	2,349	$	1,348,550	$	1,350,899

Information Pertaining to Impaired Loans

The following tables present information pertaining to impaired loans:

	For the Three Months Ended March 31, 2018
	Carrying Value		Average Carrying Value		Unpaid Principal Balance		Related Allowance		Interest Income Recognized
	(dollars in thousands)
With no required reserve recorded:
Commercial and industrial	$	23	$	25	$	23	$	—	$	—
Commercial mortgage		213		213		227		—		—
Residential mortgage		1,157		1,164		1,360		—		—
Home equity		68		69		99		—		—
Total		1,461		1,471		1,709		—		—
With required reserve recorded:
Commercial and industrial		—		—		—		—		—
Commercial mortgage		—		—		—		—		—
Residential mortgage		63		63		63		90		—
Home equity		—		—		—		—		—
Total		63		63		63		90		—
Total:
Commercial and industrial		23		25		23		—		—
Commercial mortgage		213		213		227		—		—
Residential mortgage		1,220		1,227		1,423		90		—
Home equity		68		69		99		—		—
Total	$	1,524	$	1,534	$	1,772	$	90	$	—

	For the Three Months Ended March 31, 2017
	Carrying Value		Average Carrying Value		Unpaid Principal Balance		Related Allowance		Interest Income Recognized
	(dollars in thousands)
With no required reserve recorded:
Commercial and industrial	$	—	$	—	$	—	$	—	$	—
Commercial mortgage		232		232		232		—		—
Residential mortgage		693		701		874		—
Home equity		100		101		126		—		—
Consumer		—		—		—		—		—
Total		1,025		1,034		1,232		—		—
With required reserve recorded:
Commercial and industrial		283		285		291		108		—
Commercial mortgage		—		—		—		—		—
Residential mortgage		315		317		315		200		—
Home equity		—		—		—		—		—
Total		598		602		606		308		—
Total:
Commercial and industrial		283		285		291		108		—
Commercial mortgage		232		232		232		—		—
Residential mortgage		1,008		1,018		1,189		200		—
Home equity		100		101		126		—		—
Consumer		—		—		—		—		—
Total	$	1,623	$	1,636	$	1,838	$	308	$	—

Summary of Changes in Allowance for Loan Losses Disaggregated by Loan Type

The following tables contain changes in the allowance for loan losses disaggregated by loan category :

	For the Three Months Ended March 31, 2018
	Residential Mortgages			Commercial Mortgages		Home Equity			Commercial & Industrial			Consumer			Impaired			Total
	(dollars in thousands)
Allowance for loan losses:
Balance at December 31, 2017	$	5,047		$	8,289	$	630		$	946		$	315		$	93		$	15,320
Charge-offs		—			—		—			(5	)		(5	)		—			(10	)
Recoveries		—			—		—			11			2			—			13
Provision		(355	)		648		(60	)		193			(14	)		(3	)		409
Balance at March 31, 2018	$	4,692		$	8,937	$	570		$	1,145		$	298		$	90		$	15,732

	For the Three Months Ended March 31, 2017
	Residential Mortgages			Commercial Mortgages		Home Equity			Commercial & Industrial			Consumer			Impaired		Total
	(dollars in thousands)
Allowance for loan losses:
Balance at December 31, 2016	$	4,898		$	8,451	$	651		$	807		$	264		$	190	$	15,261
Charge-offs		—			—		—			—			(7	)		—		(7	)
Recoveries		—			—		—			3			2			—		5
Provision		(86	)		175		(35	)		(152	)		10			118		30
Balance at March 31, 2017	$	4,812		$	8,626	$	616		$	658		$	269		$	308	$	15,289

Summary of Allowance for Loan Losses and Related Loans Receivable Disaggregated by Impairment Method

The following tables contain period-end balances of the allowance for loan losses and related loans receivable disaggregated by impairment method:

	March 31, 2018
	Residential Mortgages		Commercial Mortgages		Home Equity		Commercial & Industrial		Consumer		Total
	(dollars in thousands)
Allowance for loan losses
Individually evaluated for impairment	$	90	$	—	$	—	$	—	$	—	$	90
Collectively evaluated for impairment		4,692		8,937		570		1,145		298		15,642
Total	$	4,782	$	8,937	$	570	$	1,145	$	298	$	15,732
Loans receivable
Individually evaluated for impairment	$	1,220	$	213	$	68	$	23	$	—	$	1,524
Collectively evaluated for impairment		540,379		656,076		71,524		75,342		36,909		1,380,230
Total	$	541,599	$	656,289	$	71,592	$	75,365	$	36,909	$	1,381,754

	December 31, 2017
	Residential Mortgages		Commercial Mortgages		Home Equity		Commercial & Industrial		Consumer		Total
	(dollars in thousands)
Allowance for loan losses
Individually evaluated for impairment	$	93	$	—	$	—	$	—	$	—	$	93
Collectively evaluated for impairment		5,047		8,289		630		946		315		15,227
Total	$	5,140	$	8,289	$	630	$	946	$	315	$	15,320
Loans receivable
Individually evaluated for impairment	$	968	$	213	$	86	$	29	$	—	$	1,296
Collectively evaluated for impairment		537,952		633,436		74,358		65,266		38,591		1,349,603
Total	$	538,920	$	633,649	$	74,444	$	65,295	$	38,591	$	1,350,899

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Income Taxes (Tables)

3 Months Ended

Mar. 31, 2018

Income Tax Disclosure [Abstract]

Components of Income Tax Expense

The components of income tax expense were as follows:

	Three Months Ended March 31,
	2018		2017
	(dollars in thousands)
Current
Federal	$	593	$	932
State		253		234
Total current expense		846		1,166
Deferred
Federal		524		637
State		246		181
Total deferred		770		818
Total income tax expense	$	1,616	$	1,984

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Pension and Retirement Plans (Tables)

3 Months Ended

Mar. 31, 2018

Compensation And Retirement Disclosure [Abstract]

Components of Net Periodic Benefit Cost (Credit)

The components of net periodic benefit cost (credit) were as follows:

	Three Months Ended March 31,
	Pension Plan						Supplemental Retirement Plan				Retirement Healthcare Plan
	2018			2017			2018		2017		2018		2017
	(dollars in thousands)
Net periodic benefit cost
Service cost	$	—		$	447		$	89	$	67	$	6	$	4
Interest cost		386			545			77		91		5		5
Expected return on assets		(723	)		(818	)		—		—		—		—
Amortization of prior service cost (credit)		(1	)		(1	)		—		—		—		—
Amortization of net actuarial loss		16			237			1		—		5		(2	)
Net periodic benefit cost (credit)	$	(322	)	$	410		$	167	$	158	$	16	$	7

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Stock Based Compensation (Tables)

3 Months Ended

Mar. 31, 2018

Share Based Compensation [Abstract]

Schedule of Shares Issued and Fair Value of RSAs and RSUs

During the three months ended March 31, 2018, the Company issued the following RSAs and RSUs from the 2017 Equity and Cash Incentive Plan.  The fair value of RSAs and RSUs is based upon the Company’s common stock closing share price on the date of the grant. The holders of RSAs participate fully in the rewards of stock ownership of the Company, including voting and dividend rights.

		Weighted-
		Average
Shares Granted		Fair Value at Grant Date		Type of Award
	11,838	$	76.71	RSAs
	7,839	$	76.56	RSUs

Schedule of Pre-tax Expense Associated with All Outstanding Non-vested RSAs, RSUs, Performance Based Restricted Stock Units and Related Tax Benefits

The following table presents the pre-tax expense associated with all outstanding non-vested RSAs, RSUs, performance based restricted stock units, and the related tax benefits recognized:

	Three Months Ended March 31,
	2018		2017
	(dollars in thousands)
Stock based compensation expense	$	540	$	273
Related tax benefits	$	152	$	112

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Financial Instruments with Off-Balance-Sheet Risk (Tables)

3 Months Ended

Mar. 31, 2018

Fair Value Disclosures [Abstract]

Summary of Off-Balance-Sheet Financial Instruments with Contractual Amounts Include Present Credit Risk

Off-balance-sheet financial instruments with contractual amounts that present credit risk include the following:

	March 31, 2018		December 31, 2017
	(dollars in thousands)
Financial instruments whose contractual amount    represents credit risk:
Commitments to extend credit:
Unused portion of existing lines of credit	$	313,313	$	304,298
Origination of new loans		34,392		45,061
Standby letters of credit		8,669		8,322
Financial instruments whose notional amount exceeds    the amount of credit risk:
Commitments to sell residential mortgage loans		1,124		1,490
Customer related derivative contracts:
Interest rate swaps with customers		78,967		74,758
Mirror swaps with counterparties		78,967		74,758
Risk participation agreements with counterparties		39,095		38,494

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Shareholders' Equity (Tables)

3 Months Ended

Mar. 31, 2018

Equity [Abstract]

Schedule of Minimum Capital Requirements Considered Well Capitalized by FRB and FDIC

As of March 31, 2018 and December 31, 2017, the Company and the Bank met all applicable minimum capital requirements and were considered “well-capitalized” by both the FRB and the FDIC.  

	Actual					Minimum Capital Required For Capital Adequacy					Minimum Capital Required For Capital Adequacy Plus Capital Conservation Buffer Basel III Phase-In Schedule					Minimum Capital Required For Capital Adequacy Plus Capital Conservation Buffer Basel III Fully Phased In					Minimum To Be Well-Capitalized Under Prompt Corrective Action Provisions
	Amount		Ratio			Amount		Ratio			Amount		Ratio			Amount		Ratio			Amount		Ratio
	(dollars in thousands)
At March 31, 2018
Cambridge Bancorp:
Total capital (to risk-weighted    assets)	$	174,684		13.9	%	$	100,692		8.0	%	$	124,292		9.875	%	$	132,159		10.5	%	N/A		N/A
Tier I capital (to risk-weighted    assets)		158,950		12.6	%		75,519		6.0	%		99,119		7.875	%		106,986		8.5	%	N/A		N/A
Common equity tier I capital    (to risk-weighted assets)		158,950		12.6	%		56,639		4.5	%		80,239		6.375	%		88,106		7.0	%	N/A		N/A
Tier I capital (to average    assets)		158,950		8.1	%		78,043		4.0	%		78,043		4.000	%		78,043		4.0	%	N/A		N/A
Cambridge Trust Company:
Total capital (to risk-weighted    assets)	$	170,546		13.5	%	$	100,692		8.0	%	$	124,292		9.875	%	$	132,159		10.5	%	$	125,866		10.0	%
Tier I capital (to risk-weighted    assets)		154,812		12.3	%		75,519		6.0	%		99,119		7.875	%		106,986		8.5	%		100,692		8.0	%
Common equity tier I capital    (to risk-weighted assets)		154,812		12.3	%		56,639		4.5	%		80,239		6.375	%		88,106		7.0	%		81,813		6.5	%
Tier I capital (to average    assets)		154,812		7.9	%		78,043		4.0	%		78,043		4.000	%		78,043		4.0	%		97,554		5.0	%
At December 31, 2017
Cambridge Bancorp:
Total capital (to risk-weighted    assets)	$	168,615		13.7	%	$	98,136		8.0	%	$	113,470		9.25	%	$	128,804		10.5	%	N/A		N/A
Tier I capital (to risk-weighted    assets)		153,281		12.5	%		73,602		6.0	%		88,936		7.25	%		104,270		8.5	%	N/A		N/A
Common equity tier I capital    (to risk-weighted assets)		153,281		12.5	%		55,202		4.5	%		70,535		5.75	%		85,869		7.0	%	N/A		N/A
Tier I capital (to average    assets)		153,281		8.1	%		76,026		4.0	%		76,026		4.00	%		76,026		4.0	%	N/A		N/A
Cambridge Trust Company:
Total capital (to risk-weighted    assets)	$	164,880		13.4	%	$	98,136		8.0	%	$	113,470		9.25	%	$	128,804		10.5	%	$	122,670		10.0	%
Tier I capital (to risk-weighted    assets)		149,546		12.2	%		73,602		6.0	%		88,936		7.25	%		104,270		8.5	%		98,136		8.0	%
Common equity tier I capital    (to risk-weighted assets)		149,546		12.2	%		55,202		4.5	%		70,535		5.75	%		85,869		7.0	%		79,736		6.5	%
Tier I capital (to average    assets)		149,546		7.9	%		76,026		4.0	%		76,026		4.00	%		76,026		4.0	%		95,033		5.0	%

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Other Comprehensive Income (Tables)

3 Months Ended

Mar. 31, 2018

Equity [Abstract]

Summary of Other Comprehensive Income

The following table presents the changes in accumulated other comprehensive income (loss) during the period, by component, net of tax:

	Three Months Ended March 31, 2018									Three Months Ended March 31, 2017
	Before Tax Amount			Tax (Expense) or Benefit			Net-of-tax Amount			Before Tax Amount		Tax (Expense) or Benefit			Net-of-tax Amount
	(dollars in thousands)
Unrealized gains/(losses) on available for sale securities
Unrealized holding gains/(losses) arising during period	$	(1,678	)	$	326		$	(1,352	)	$	292	$	(103	)	$	189
Reclassification adjustment for (gains)/losses recognized in net income		—			—			—			2		(1	)		1
Defined benefit retirement plans
Change in retirement liability		14			(4	)		10			224		(92	)		132
Total Other Comprehensive Income (Loss)	$	(1,664	)	$	322		$	(1,342	)	$	518	$	(196	)	$	322

Summary of Reclassifications out of Accumulated Other Comprehensive Income (“AOCI”)

Reclassifications out of Accumulated Other Comprehensive Income (“AOCI”) that have an impact on net income are presented below:

Three Months Ended March 31,
Details about Accumulated Other Comprehensive Income Components	2018		2017			Affected Line Item in the Statement where Net Income is Presented
	(dollars in thousands)
Unrealized gains and losses on available    for sale securities	$	—	$	(2	)	(Loss) gain on disposition of    investment securities
Tax benefit or (expense)		—		1		Provision for income taxes
Net of tax	$	—	$	(1	)	Net income

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Earnings Per Share (Tables)

3 Months Ended

Mar. 31, 2018

Earnings Per Share [Abstract]

Summary of Reconciliation Between Basic and Diluted Earnings Per Share

The following represents a reconciliation between basic and diluted earnings per share:

	Three Months Ended March 31,
	2018			2017
	(dollars in thousands, except per share data)
Earnings per common share - basic:
Numerator:
Net income	$	5,805		$	4,328
Less dividends and undistributed earnings allocated    to participating securities		(64	)		(47	)
Net income applicable to common shareholders	$	5,741		$	4,281
Denominator:
Weighted average common shares outstanding		4,053			4,012
Earnings per common share - basic	$	1.42		$	1.07
Earnings per common share - diluted:
Numerator:
Net income	$	5,805		$	4,328
Less dividends and undistributed earnings allocated    to participating securities		(64	)		(47	)
Net income applicable to common shareholders	$	5,741		$	4,281
Denominator:
Weighted average common shares outstanding		4,053			4,012
Dilutive effect of common stock equivalents		19			39
Weighted average diluted common shares outstanding		4,072			4,051
Earnings per common share - diluted	$	1.41		$	1.06

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Derivative Financial Instruments (Tables)

3 Months Ended

Mar. 31, 2018

Derivative Instruments Not Designated As Hedging Instruments [Abstract]

Summary of Fair Values of Derivative Instruments in the Company's Unaudited Consolidated Balance Sheets

The following table presents the fair values of derivative instruments in the Company’s unaudited consolidated balance sheets:

		Derivative Assets					Derivative Liabilities
	Balance Sheet Location	March 31, 2018		December 31, 2017		Balance Sheet Location	March 31, 2018		December 31, 2017
		(dollars in thousands)					(dollars in thousands)
Derivatives not Designated as Hedging Instruments
Loan related derivative contracts
Interest rate swaps with customers	Other Assets	$	3,253	$	1,859	Other Liabilities	$	—	$	—
Mirror swaps with counterparties	Other Assets		—		—	Other Liabilities		3,253		1,859
Risk participation agreements	Other Assets		—		—	Other Liabilities		54		81
Total		$	3,253	$	1,859		$	3,307	$	1,940

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Fair Value Measurements (Tables)

3 Months Ended

Mar. 31, 2018

Fair Value Disclosures [Abstract]

Summary of Carrying Values and Estimated Fair Values of Financial Instruments

The following is a summary of the carrying values and estimated fair values of the Company’s significant financial instruments as of the dates indicated:

	March 31, 2018				December 31, 2017
	Carrying Value		Estimated Fair Value		Carrying Value		Estimated Fair Value
	(dollars in thousands)
Financial assets
Cash and cash equivalents	$	56,265	$	56,265	$	103,591	$	103,591
Securities available for sale		197,935		197,935		205,017		205,017
Securities held to maturity		264,409		262,432		232,188		233,554
Loans, net		1,366,022		1,320,509		1,335,579		1,304,719
Loans held for sale		—		—		—		—
FHLB Boston stock		4,242		4,242		4,242		4,242
Bank owned life insurance		30,535		30,535		31,083		31,083
Accrued interest receivable		5,059		5,059		5,128		5,128
Mortgage servicing rights		760		1,049		793		1,049
Loan level interest rate swaps		3,253		3,253		1,859		1,859
Financial liabilities
Deposits		1,782,392		1,779,459		1,775,400		1,772,838
Short-term borrowings		—		—		—		—
Long-term borrowings		3,537		3,486		3,579		3,559
Loan level interest rate swaps		3,253		3,253		1,859		1,859
Risk participation agreements		54		54		81		81

Summary of Certain Assets Reported at Fair Value on a Recurring Basis

The following tables summarize certain assets reported at fair value on a recurring basis:

	Fair Value as of March 31, 2018
	Level 1		Level 2		Level 3		Total
	(dollars in thousands)
Measured on a recurring basis
Securities available for sale
U.S. GSE obligations	$	—	$	88,423	$	—	$	88,423
Mortgage-backed securities		—		103,980		—		103,980
Corporate debt securities		—		4,945		—		4,945
Mutual funds		587		—		—		587
Other assets
Interest rate swaps with customers		—		3,253		—		3,253
Other liabilities
Mirror swaps with counterparties		—		3,253		—		3,253
Risk participation agreements		—		54		—		54

	Fair Value as of December 31, 2017
	Level 1		Level 2		Level 3		Total
	(dollars in thousands)
Measured on a recurring basis
Securities available for sale
U.S. GSE obligations	$	—	$	88,791	$	—	$	88,791
Mortgage-backed securities		—		110,626		—		110,626
Corporate debt securities		—		5,001		—		5,001
Mutual funds		599		—		—		599
Other assets
Interest rate swaps with customers		—		1,859		—		1,859
Other liabilities
Mirror swaps with counterparties		—		1,859		—		1,859
Risk participation agreements		—		81		—		81

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Recently Issued and Adopted Accounting Guidance - Additional Information (Details) - USD ($)	3 Months Ended	12 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Federal tax rate	21.00%	35.00%
Accounting Standards Update 2018-02
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Reclassification from AOCI to retained earnings	$ 1,300,000
Reclassification effect on shareholder equity	$ 0

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Cash and Due from Banks - Additional Information (Details) - USD ($)	Mar. 31, 2018	Dec. 31, 2017
Cash And Due From Banks [Line Items]
Cash and due from banks	$ 56,300,000	$ 103,600,000
FRB Boston
Cash And Due From Banks [Line Items]
Reserve balance of cash and due from banks	15,400,000	12,800,000
New Hampshire
Cash And Due From Banks [Line Items]
Pledged amount to federal banking department	$ 500,000	$ 500,000

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Investment Securities - Summary of Carrying Amounts of Securities and Their Approximate Fair Values (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Schedule of Available for Sale Securities and Held to Maturity Securities [Line Items]
Available for sale securities, Amortized Cost	$ 203,507	$ 208,911
Available for sale securities, Gross Unrealized Gains	205	260
Available for sale securities, Gross Unrealized Losses	(5,777)	(4,154)
Available for sale securities, Fair Value	197,935	205,017
Held to maturity securities, Amortized Cost	264,409	232,188
Held to maturity securities, Gross Unrealized Gains	1,394	2,555
Held to maturity securities, Gross Unrealized Losses	(3,371)	(1,189)
Held to maturity securities, Fair Value	262,432	233,554
Total, Amortized Cost	467,916	441,099
Total, Gross Unrealized Gains	1,599	2,815
Total, Gross Unrealized Losses	(9,148)	(5,343)
Total, Fair Value	460,367	438,571
U.S. GSE Obligations
Schedule of Available for Sale Securities and Held to Maturity Securities [Line Items]
Available for sale securities, Amortized Cost	90,017	90,021
Available for sale securities, Gross Unrealized Losses	(1,594)	(1,230)
Available for sale securities, Fair Value	88,423	88,791
Held to maturity securities, Amortized Cost	32,572	32,572
Held to maturity securities, Gross Unrealized Losses	(326)	(166)
Held to maturity securities, Fair Value	32,246	32,406
Corporate Debt Securities
Schedule of Available for Sale Securities and Held to Maturity Securities [Line Items]
Available for sale securities, Amortized Cost	5,029	5,034
Available for sale securities, Gross Unrealized Gains		12
Available for sale securities, Gross Unrealized Losses	(84)	(45)
Available for sale securities, Fair Value	4,945	5,001
Held to maturity securities, Amortized Cost	6,966	1,998
Held to maturity securities, Gross Unrealized Gains		4
Held to maturity securities, Gross Unrealized Losses	(104)
Held to maturity securities, Fair Value	6,862	2,002
Mortgage Backed Securities
Schedule of Available for Sale Securities and Held to Maturity Securities [Line Items]
Available for sale securities, Amortized Cost	107,874	113,184
Available for sale securities, Gross Unrealized Gains	205	248
Available for sale securities, Gross Unrealized Losses	(4,099)	(2,806)
Available for sale securities, Fair Value	103,980	110,626
Held to maturity securities, Amortized Cost	146,316	117,155
Held to maturity securities, Gross Unrealized Gains	11	7
Held to maturity securities, Gross Unrealized Losses	(2,411)	(906)
Held to maturity securities, Fair Value	143,916	116,256
Mutual Funds
Schedule of Available for Sale Securities and Held to Maturity Securities [Line Items]
Available for sale securities, Amortized Cost	587	672
Available for sale securities, Gross Unrealized Losses		(73)
Available for sale securities, Fair Value	587	599
Municipal Securities
Schedule of Available for Sale Securities and Held to Maturity Securities [Line Items]
Held to maturity securities, Amortized Cost	78,555	80,463
Held to maturity securities, Gross Unrealized Gains	1,383	2,544
Held to maturity securities, Gross Unrealized Losses	(530)	(117)
Held to maturity securities, Fair Value	$ 79,408	$ 82,890

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Investment Securities - Gross Unrealized Losses of Aggregated by Investment Category and Length of Time that Individual Securities have been in Continuous Loss Position (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Schedule of Available for Sale Securities and Held to Maturity Securities [Line Items]
Temporarily Impaired Securities, Available for sale securities, Fair Value, Less than 12 months	$ 12,763	$ 17,505
Temporarily Impaired Securities, Available for sale securities, Unrealized Losses, Less than 12 months	(362)	(178)
Temporarily Impaired Securities, Available for sale securities, Fair Value, 12 months or longer	181,422	183,064
Temporarily Impaired Securities, Available for sale securities, Unrealized Losses, 12 months or longer	(5,415)	(3,976)
Temporarily Impaired Securities, Available for sale securities, Fair Value	194,185	200,569
Temporarily Impaired Securities, Available for sale securities, Unrealized Losses	(5,777)	(4,154)
Temporarily Impaired Securities, Held to maturity securities, Fair Value, Less than 12 months	182,864	145,374
Temporarily Impaired Securities, Held to maturity securities, Unrealized Losses, Less than 12 months	(3,041)	(1,091)
Temporarily Impaired Securities, Held to maturity securities, Fair Value, 12 months or longer	10,035	6,462
Temporarily Impaired Securities, Held to maturity securities, Unrealized Losses, 12 months or longer	(330)	(98)
Temporarily Impaired Securities, Held to maturity securities, Fair Value	192,899	151,836
Temporarily Impaired Securities, Held to maturity securities, Unrealized Losses	(3,371)	(1,189)
Temporarily Impaired Securities, Fair Value, Less than 12 months	195,627	162,879
Temporarily Impaired Securities, Unrealized Losses, Less than 12 months	(3,403)	(1,269)
Temporarily Impaired Securities, Fair Value, 12 months or longer	191,457	189,526
Temporarily Impaired Securities, Unrealized Losses, 12 months or longer	(5,745)	(4,074)
Temporarily Impaired Securities, Fair Value	387,084	352,405
Temporarily Impaired Securities, Unrealized Losses	(9,148)	(5,343)
U.S. GSE Obligations
Schedule of Available for Sale Securities and Held to Maturity Securities [Line Items]
Temporarily Impaired Securities, Available for sale securities, Fair Value, Less than 12 months		4,979
Temporarily Impaired Securities, Available for sale securities, Unrealized Losses, Less than 12 months		(21)
Temporarily Impaired Securities, Available for sale securities, Fair Value, 12 months or longer	88,423	83,812
Temporarily Impaired Securities, Available for sale securities, Unrealized Losses, 12 months or longer	(1,594)	(1,209)
Temporarily Impaired Securities, Available for sale securities, Fair Value	88,423	88,791
Temporarily Impaired Securities, Available for sale securities, Unrealized Losses	(1,594)	(1,230)
Temporarily Impaired Securities, Held to maturity securities, Fair Value, Less than 12 months	32,246	27,407
Temporarily Impaired Securities, Held to maturity securities, Unrealized Losses, Less than 12 months	(326)	(166)
Temporarily Impaired Securities, Held to maturity securities, Fair Value	32,246	27,407
Temporarily Impaired Securities, Held to maturity securities, Unrealized Losses	(326)	(166)
Mortgage Backed Securities
Schedule of Available for Sale Securities and Held to Maturity Securities [Line Items]
Temporarily Impaired Securities, Available for sale securities, Fair Value, Less than 12 months	11,765	12,526
Temporarily Impaired Securities, Available for sale securities, Unrealized Losses, Less than 12 months	(360)	(157)
Temporarily Impaired Securities, Available for sale securities, Fair Value, 12 months or longer	89,052	94,663
Temporarily Impaired Securities, Available for sale securities, Unrealized Losses, 12 months or longer	(3,739)	(2,649)
Temporarily Impaired Securities, Available for sale securities, Fair Value	100,817	107,189
Temporarily Impaired Securities, Available for sale securities, Unrealized Losses	(4,099)	(2,806)
Temporarily Impaired Securities, Held to maturity securities, Fair Value, Less than 12 months	129,538	115,926
Temporarily Impaired Securities, Held to maturity securities, Unrealized Losses, Less than 12 months	(2,375)	(906)
Temporarily Impaired Securities, Held to maturity securities, Fair Value, 12 months or longer	3,778	3
Temporarily Impaired Securities, Held to maturity securities, Unrealized Losses, 12 months or longer	(36)
Temporarily Impaired Securities, Held to maturity securities, Fair Value	133,316	115,929
Temporarily Impaired Securities, Held to maturity securities, Unrealized Losses	(2,411)	(906)
Corporate Debt Securities
Schedule of Available for Sale Securities and Held to Maturity Securities [Line Items]
Temporarily Impaired Securities, Available for sale securities, Fair Value, Less than 12 months	998
Temporarily Impaired Securities, Available for sale securities, Unrealized Losses, Less than 12 months	(2)
Temporarily Impaired Securities, Available for sale securities, Fair Value, 12 months or longer	3,947	3,990
Temporarily Impaired Securities, Available for sale securities, Unrealized Losses, 12 months or longer	(82)	(45)
Temporarily Impaired Securities, Available for sale securities, Fair Value	4,945	3,990
Temporarily Impaired Securities, Available for sale securities, Unrealized Losses	(84)	(45)
Temporarily Impaired Securities, Held to maturity securities, Fair Value, Less than 12 months	6,862
Temporarily Impaired Securities, Held to maturity securities, Unrealized Losses, Less than 12 months	(104)
Temporarily Impaired Securities, Held to maturity securities, Fair Value	6,862
Temporarily Impaired Securities, Held to maturity securities, Unrealized Losses	(104)
Mutual Funds
Schedule of Available for Sale Securities and Held to Maturity Securities [Line Items]
Temporarily Impaired Securities, Available for sale securities, Fair Value, 12 months or longer		599
Temporarily Impaired Securities, Available for sale securities, Unrealized Losses, 12 months or longer		(73)
Temporarily Impaired Securities, Available for sale securities, Fair Value		599
Temporarily Impaired Securities, Available for sale securities, Unrealized Losses		(73)
Municipal Securities
Schedule of Available for Sale Securities and Held to Maturity Securities [Line Items]
Temporarily Impaired Securities, Held to maturity securities, Fair Value, Less than 12 months	14,218	2,041
Temporarily Impaired Securities, Held to maturity securities, Unrealized Losses, Less than 12 months	(236)	(19)
Temporarily Impaired Securities, Held to maturity securities, Fair Value, 12 months or longer	6,257	6,459
Temporarily Impaired Securities, Held to maturity securities, Unrealized Losses, 12 months or longer	(294)	(98)
Temporarily Impaired Securities, Held to maturity securities, Fair Value	20,475	8,500
Temporarily Impaired Securities, Held to maturity securities, Unrealized Losses	$ (530)	$ (117)

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Investment Securities - Additional Information (Details)	Mar. 31, 2018 USD ($) Security	Dec. 31, 2017 USD ($) Security
Schedule of Available for Sale Securities and Held to Maturity Securities [Line Items]
Number of debt securities with unrealized losses | Security	151	118
Aggregate depreciation percentage of gross unrealized losses from amortized cost	2.31%	1.49%
Number of equity securities with unrealized losses | Security		1
Maximum
Schedule of Available for Sale Securities and Held to Maturity Securities [Line Items]
Percentage of unrealized loss on amortized cost	9.25%	10.90%
Unrealized loss of amortized cost basis | $	$ 46,000	$ 73,000
Unrealized dollar loss of amortized cost basis | $	$ 237,000	$ 185,000
Percentage of unrealized dollar loss on amortized cost	4.74%	3.71%

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Investment Securities - Schedule of Amortized Cost and Fair Value of Debt Securities, Aggregated By Earlier of Guaranteed Call Date or Contractual Maturity (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Schedule of Available for Sale Securities and Held to Maturity Securities [Line Items]
Available for sale securities, Within One Year, Amortized Cost	$ 20,057
Available for sale securities, Within One Year, Fair Value	19,937
Available for sale securities, After One, But Within Five Years, Amortized Cost	75,145
Available for sale securities, After One, But Within Five Years, Fair Value	73,591
Available for sale securities, After Five, But Within Ten Years, Amortized Cost	38,868
Available for sale securities, After Five, But Within Ten Years, Fair Value	37,492
Available for sale securities, After Ten Years, Amortized Cost	68,850
Available for sale securities, After Ten Years, Fair Value	66,328
Available for sale securities, Total, Amortized Cost	202,920
Available for sale securities, Total, Fair Value	197,348
Held to maturity securities, Within One Year, Amortized Cost	9,333
Held to maturity securities, Within One Year, Fair Value	9,337
Held to maturity securities, After One, But Within Five Years, Amortized Cost	47,335
Held to maturity securities, After One, But Within Five Years, Fair Value	47,165
Held to maturity securities, After Five, But Within Ten Years, Amortized Cost	69,967
Held to maturity securities, After Five, But Within Ten Years, Fair Value	69,988
Held to maturity securities, After Ten Years, Amortized Cost	137,774
Held to maturity securities, After Ten Years, Fair Value	135,942
Held to maturity securities, Amortized Cost	264,409	$ 232,188
Held to maturity securities, Fair Value	262,432	233,554
Available for sale securities and Held to maturity securities, Within One Year, Amortized Cost	29,390
Available for sale securities and Held to maturity securities, Within One Year, Fair Value	29,274
Available for sale securities and Held to maturity securities, After One, But Within Five Years, Amortized Cost	122,480
Available for sale securities and Held to maturity securities, After One, But Within Five Years, Fair Value	120,756
Available for sale securities and Held to maturity securities, After Five, But Within Ten Years, Amortized Cost	108,835
Available for sale securities and Held to maturity securities, After Five, But Within Ten Years, Fair Value	107,480
Available for sale securities and Held to maturity securities, After Ten Years, Amortized Cost	206,624
Available for sale securities and Held to maturity securities, After Ten Years, Fair Value	202,270
Available for sale securities and Held to maturity securities, Total, Amortized Cost	467,329
Available for sale securities and Held to maturity securities, Total, Fair Value	459,780
U.S. GSE Obligations
Schedule of Available for Sale Securities and Held to Maturity Securities [Line Items]
Available for sale securities, Within One Year, Amortized Cost	20,017
Available for sale securities, Within One Year, Fair Value	19,897
Available for sale securities, After One, But Within Five Years, Amortized Cost	70,000
Available for sale securities, After One, But Within Five Years, Fair Value	68,526
Available for sale securities, Total, Amortized Cost	90,017
Available for sale securities, Total, Fair Value	88,423
Held to maturity securities, Within One Year, Amortized Cost	5,004
Held to maturity securities, Within One Year, Fair Value	4,970
Held to maturity securities, After One, But Within Five Years, Amortized Cost	27,568
Held to maturity securities, After One, But Within Five Years, Fair Value	27,276
Held to maturity securities, Amortized Cost	32,572
Held to maturity securities, Fair Value	32,246
Mortgage Backed Securities
Schedule of Available for Sale Securities and Held to Maturity Securities [Line Items]
Available for sale securities, Within One Year, Amortized Cost	40
Available for sale securities, Within One Year, Fair Value	40
Available for sale securities, After One, But Within Five Years, Amortized Cost	116
Available for sale securities, After One, But Within Five Years, Fair Value	120
Available for sale securities, After Five, But Within Ten Years, Amortized Cost	38,868
Available for sale securities, After Five, But Within Ten Years, Fair Value	37,492
Available for sale securities, After Ten Years, Amortized Cost	68,850
Available for sale securities, After Ten Years, Fair Value	66,328
Available for sale securities, Total, Amortized Cost	107,874
Available for sale securities, Total, Fair Value	103,980
Held to maturity securities, Within One Year, Amortized Cost	3
Held to maturity securities, Within One Year, Fair Value	3
Held to maturity securities, After One, But Within Five Years, Amortized Cost	190
Held to maturity securities, After One, But Within Five Years, Fair Value	192
Held to maturity securities, After Five, But Within Ten Years, Amortized Cost	34,891
Held to maturity securities, After Five, But Within Ten Years, Fair Value	34,384
Held to maturity securities, After Ten Years, Amortized Cost	111,232
Held to maturity securities, After Ten Years, Fair Value	109,337
Held to maturity securities, Amortized Cost	146,316
Held to maturity securities, Fair Value	143,916
Corporate Debt Securities
Schedule of Available for Sale Securities and Held to Maturity Securities [Line Items]
Available for sale securities, After One, But Within Five Years, Amortized Cost	5,029
Available for sale securities, After One, But Within Five Years, Fair Value	4,945
Available for sale securities, Total, Amortized Cost	5,029
Available for sale securities, Total, Fair Value	4,945
Held to maturity securities, After One, But Within Five Years, Amortized Cost	6,966
Held to maturity securities, After One, But Within Five Years, Fair Value	6,862
Held to maturity securities, Amortized Cost	6,966
Held to maturity securities, Fair Value	6,862
Municipal Securities
Schedule of Available for Sale Securities and Held to Maturity Securities [Line Items]
Held to maturity securities, Within One Year, Amortized Cost	4,326
Held to maturity securities, Within One Year, Fair Value	4,364
Held to maturity securities, After One, But Within Five Years, Amortized Cost	12,611
Held to maturity securities, After One, But Within Five Years, Fair Value	12,835
Held to maturity securities, After Five, But Within Ten Years, Amortized Cost	35,076
Held to maturity securities, After Five, But Within Ten Years, Fair Value	35,604
Held to maturity securities, After Ten Years, Amortized Cost	26,542
Held to maturity securities, After Ten Years, Fair Value	26,605
Held to maturity securities, Amortized Cost	78,555	80,463
Held to maturity securities, Fair Value	$ 79,408	$ 82,890

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Investment Securities - Summary of Gains (Losses) from Sale of Investment Securities (Detail) $ in Thousands	3 Months Ended
	Mar. 31, 2017 USD ($)
Investments Debt And Equity Securities [Abstract]
Amortized cost of securities sold	$ 32,703
Gain/(loss) realized on securities sold	(2)
Net proceeds from securities sold	$ 32,701

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Loans and the Allowance for Loan Losses - Loans Outstanding by Category (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Loans And Leases Receivable Disclosure [Line Items]
Total loans	$ 1,381,754	$ 1,350,899
Residential Mortgage
Loans And Leases Receivable Disclosure [Line Items]
Deferred costs (fees) net of unearned fees	1,087	1,042
Total loans	541,599	538,920
Residential Mortgage | Mortgages - Fixed Rate
Loans And Leases Receivable Disclosure [Line Items]
Loans outstanding by category gross	299,182	298,851
Residential Mortgage | Mortgages - Adjustable Rate
Loans And Leases Receivable Disclosure [Line Items]
Loans outstanding by category gross	241,330	239,027
Commercial Mortgage
Loans And Leases Receivable Disclosure [Line Items]
Deferred costs (fees) net of unearned fees	240	199
Total loans	656,289	633,649
Commercial Mortgage | Construction
Loans And Leases Receivable Disclosure [Line Items]
Loans outstanding by category gross	31,585	35,904
Commercial Mortgage | Mortgages - Nonowner Occupied
Loans And Leases Receivable Disclosure [Line Items]
Loans outstanding by category gross	584,414	562,203
Commercial Mortgage | Mortgages - Owner Occupied
Loans And Leases Receivable Disclosure [Line Items]
Loans outstanding by category gross	40,050	35,343
Home Equity
Loans And Leases Receivable Disclosure [Line Items]
Deferred costs (fees) net of unearned fees	251	255
Total loans	71,592	74,444
Home Equity | Home Equity - Lines of Credit
Loans And Leases Receivable Disclosure [Line Items]
Loans outstanding by category gross	66,889	70,326
Home Equity | Home Equity - Term Loans
Loans And Leases Receivable Disclosure [Line Items]
Loans outstanding by category gross	4,452	3,863
Commercial & Industrial
Loans And Leases Receivable Disclosure [Line Items]
Loans outstanding by category gross	75,354	65,305
Deferred costs (fees) net of unearned fees	11	(10)
Total loans	75,365	65,295
Consumer
Loans And Leases Receivable Disclosure [Line Items]
Deferred costs (fees) net of unearned fees	16	16
Total loans	36,909	38,591
Consumer | Secured
Loans And Leases Receivable Disclosure [Line Items]
Loans outstanding by category gross	35,705	37,272
Consumer | Unsecured
Loans And Leases Receivable Disclosure [Line Items]
Loans outstanding by category gross	$ 1,188	$ 1,303

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Loans and the Allowance for Loan Losses - Additional Information (Details)	3 Months Ended	12 Months Ended
	Mar. 31, 2018 USD ($) Loan	Dec. 31, 2017 USD ($) Loan
Financing Receivable Modifications [Line Items]
Loans outstanding to directors and officers	$ 429,000	$ 516,000
Loans to directors and officers, additions	6,000	124,000
Loans to directors and officers, repayments	$ 93,000	$ 298,000
Number of loans modified as troubled debt restructuring | Loan	0	1
Number of loans determined to be troubled debt restructurings | Loan	3	3
Troubled debt restructuring carrying value	$ 142,000	$ 150,000
Number of TDRs defaulted during the period | Loan	0	0
Pre-modification carrying value		$ 65,000
Post-modification carrying value		$ 48,000
Number of loans designated to be troubled debt restructurings | Loan		2
Specific allowances for troubled debt restructurings	$ 0	$ 0
Commitments to lend additional funds to borrowers whose loans were on non-accrual status	0	0
Loans secured by one- to-four family residential properties in process of foreclosure	$ 63,000,000	64,000,000
Troubled Debt Restructurings
Financing Receivable Modifications [Line Items]
Troubled debt restructuring carrying value		$ 29,000

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Loans and the Allowance for Loan Losses - Non-performing Loans Disaggregated by Loan Category (Details) - USD ($)	Mar. 31, 2018	Dec. 31, 2017
Financing Receivable Recorded Investment Past Due [Line Items]
Troubled debt restructurings	$ 142,000	$ 150,000
Non-Performing Loans
Financing Receivable Recorded Investment Past Due [Line Items]
Non-accrual loans	1,405,000	1,148,000
Troubled debt restructurings	142,000	150,000
Total	1,547,000	1,298,000
Non-Performing Loans | Residential Mortgage
Financing Receivable Recorded Investment Past Due [Line Items]
Non-accrual loans	1,177,000	918,000
Troubled debt restructurings	119,000	121,000
Total	1,296,000	1,039,000
Non-Performing Loans | Commercial Mortgage
Financing Receivable Recorded Investment Past Due [Line Items]
Non-accrual loans	213,000	213,000
Total	213,000	213,000
Non-Performing Loans | Home Equity
Financing Receivable Recorded Investment Past Due [Line Items]
Non-accrual loans	15,000	17,000
Total	15,000	17,000
Non-Performing Loans | Commercial & Industrial
Financing Receivable Recorded Investment Past Due [Line Items]
Troubled debt restructurings	23,000	29,000
Total	$ 23,000	$ 29,000

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Loans and the Allowance for Loan Losses - Loans Receivable Disaggregated by Credit Quality Indicator (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Financing Receivable Recorded Investment [Line Items]
Loans receivable	$ 1,381,754	$ 1,350,899
Residential Mortgage
Financing Receivable Recorded Investment [Line Items]
Loans receivable	541,599	538,920
Residential Mortgage | Performing
Financing Receivable Recorded Investment [Line Items]
Loans receivable	540,303	537,881
Residential Mortgage | Non-Performing Loans
Financing Receivable Recorded Investment [Line Items]
Loans receivable	1,296	1,039
Home Equity
Financing Receivable Recorded Investment [Line Items]
Loans receivable	71,592	74,444
Home Equity | Performing
Financing Receivable Recorded Investment [Line Items]
Loans receivable	71,577	74,427
Home Equity | Non-Performing Loans
Financing Receivable Recorded Investment [Line Items]
Loans receivable	15	17
Consumer
Financing Receivable Recorded Investment [Line Items]
Loans receivable	36,909	38,591
Consumer | Performing
Financing Receivable Recorded Investment [Line Items]
Loans receivable	36,909	38,591
Commercial Mortgage
Financing Receivable Recorded Investment [Line Items]
Loans receivable	656,289	633,649
Commercial Mortgage | 1-6 (Pass)
Financing Receivable Recorded Investment [Line Items]
Loans receivable	651,366	629,852
Commercial Mortgage | 7 (Special Mention)
Financing Receivable Recorded Investment [Line Items]
Loans receivable	4,710	3,584
Commercial Mortgage | 8 (Substandard)
Financing Receivable Recorded Investment [Line Items]
Loans receivable	213	213
Commercial & Industrial
Financing Receivable Recorded Investment [Line Items]
Loans receivable	75,365	65,295
Commercial & Industrial | 1-6 (Pass)
Financing Receivable Recorded Investment [Line Items]
Loans receivable	67,033	56,755
Commercial & Industrial | 7 (Special Mention)
Financing Receivable Recorded Investment [Line Items]
Loans receivable	7,991	8,126
Commercial & Industrial | 8 (Substandard)
Financing Receivable Recorded Investment [Line Items]
Loans receivable	$ 341	$ 414

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Loans and the Allowance for Loan Losses - Schedule of Loans Receivable Disaggregated by Past Due Status (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Financing Receivable Allowance For Credit Losses [Line Items]
Total Past Due	$ 3,314	$ 2,349
Current Loans	1,378,440	1,348,550
Total	1,381,754	1,350,899
30-59 Days Past Due
Financing Receivable Allowance For Credit Losses [Line Items]
Total Past Due	1,980	1,530
60-89 Days Past Due
Financing Receivable Allowance For Credit Losses [Line Items]
Total Past Due	435	738
90 Days or Greater
Financing Receivable Allowance For Credit Losses [Line Items]
Total Past Due	899	81
Residential Mortgage
Financing Receivable Allowance For Credit Losses [Line Items]
Total Past Due	3,017	2,123
Current Loans	538,582	536,797
Total	541,599	538,920
Residential Mortgage | 30-59 Days Past Due
Financing Receivable Allowance For Credit Losses [Line Items]
Total Past Due	1,908	1,353
Residential Mortgage | 60-89 Days Past Due
Financing Receivable Allowance For Credit Losses [Line Items]
Total Past Due	423	706
Residential Mortgage | 90 Days or Greater
Financing Receivable Allowance For Credit Losses [Line Items]
Total Past Due	686	64
Commercial Mortgage
Financing Receivable Allowance For Credit Losses [Line Items]
Total Past Due	213	32
Current Loans	656,076	633,617
Total	656,289	633,649
Commercial Mortgage | 60-89 Days Past Due
Financing Receivable Allowance For Credit Losses [Line Items]
Total Past Due		32
Commercial Mortgage | 90 Days or Greater
Financing Receivable Allowance For Credit Losses [Line Items]
Total Past Due	213
Commercial & Industrial
Financing Receivable Allowance For Credit Losses [Line Items]
Total Past Due	25
Current Loans	75,340	65,295
Total	75,365	65,295
Commercial & Industrial | 30-59 Days Past Due
Financing Receivable Allowance For Credit Losses [Line Items]
Total Past Due	25
Consumer loans
Financing Receivable Allowance For Credit Losses [Line Items]
Total Past Due	15	176
Current Loans	36,894	38,415
Total	36,909	38,591
Consumer loans | 30-59 Days Past Due
Financing Receivable Allowance For Credit Losses [Line Items]
Total Past Due	3	176
Consumer loans | 60-89 Days Past Due
Financing Receivable Allowance For Credit Losses [Line Items]
Total Past Due	12
Home Equity
Financing Receivable Allowance For Credit Losses [Line Items]
Total Past Due	44	18
Current Loans	71,548	74,426
Total	71,592	74,444
Home Equity | 30-59 Days Past Due
Financing Receivable Allowance For Credit Losses [Line Items]
Total Past Due	$ 44	1
Home Equity | 90 Days or Greater
Financing Receivable Allowance For Credit Losses [Line Items]
Total Past Due		$ 17

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Loans and the Allowance for Loan Losses - Information Pertaining to Impaired Loans (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Financing Receivable Allowance For Credit Losses [Line Items]
With no required reserve recorded, Carrying Value	$ 1,461	$ 1,025
With no required reserve recorded, Average Carrying Value	1,471	1,034
With no required reserve recorded, Unpaid Principal Balance	1,709	1,232
With required reserve recorded, Carrying Value	63	598
With required reserve recorded, Average Carrying Value	63	602
With required reserve recorded, Unpaid Principal Balance	63	606
With required reserve recorded, Related Allowance	90	308
Carrying Value	1,524	1,623
Average Carrying Value	1,534	1,636
Unpaid Principal Balance	1,772	1,838
Related Allowance	90	308
Commercial and Industrial
Financing Receivable Allowance For Credit Losses [Line Items]
With no required reserve recorded, Carrying Value	23
With no required reserve recorded, Average Carrying Value	25
With no required reserve recorded, Unpaid Principal Balance	23
With required reserve recorded, Carrying Value		283
With required reserve recorded, Average Carrying Value		285
With required reserve recorded, Unpaid Principal Balance		291
With required reserve recorded, Related Allowance		108
Carrying Value	23	283
Average Carrying Value	25	285
Unpaid Principal Balance	23	291
Related Allowance		108
Commercial Mortgage
Financing Receivable Allowance For Credit Losses [Line Items]
With no required reserve recorded, Carrying Value	213	232
With no required reserve recorded, Average Carrying Value	213	232
With no required reserve recorded, Unpaid Principal Balance	227	232
Carrying Value	213	232
Average Carrying Value	213	232
Unpaid Principal Balance	227	232
Residential Mortgage
Financing Receivable Allowance For Credit Losses [Line Items]
With no required reserve recorded, Carrying Value	1,157	693
With no required reserve recorded, Average Carrying Value	1,164	701
With no required reserve recorded, Unpaid Principal Balance	1,360	874
With required reserve recorded, Carrying Value	63	315
With required reserve recorded, Average Carrying Value	63	317
With required reserve recorded, Unpaid Principal Balance	63	315
With required reserve recorded, Related Allowance	90	200
Carrying Value	1,220	1,008
Average Carrying Value	1,227	1,018
Unpaid Principal Balance	1,423	1,189
Related Allowance	90	200
Home Equity
Financing Receivable Allowance For Credit Losses [Line Items]
With no required reserve recorded, Carrying Value	68	100
With no required reserve recorded, Average Carrying Value	69	101
With no required reserve recorded, Unpaid Principal Balance	99	126
Carrying Value	68	100
Average Carrying Value	69	101
Unpaid Principal Balance	$ 99	$ 126

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Loans and the Allowance for Loan Losses - Summary of Changes in Allowance for Loan Losses Disaggregated by Loan Type (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for loan losses, Beginning balance	$ 15,320	$ 15,261
Charge-offs	(10)	(7)
Recoveries	13	5
Provision	409	30
Allowance for loan losses, Ending balance	15,732	15,289
Residential Mortgage
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for loan losses, Beginning balance	5,047	4,898
Provision	(355)	(86)
Allowance for loan losses, Ending balance	4,692	4,812
Commercial Mortgage
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for loan losses, Beginning balance	8,289	8,451
Provision	648	175
Allowance for loan losses, Ending balance	8,937	8,626
Home Equity
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for loan losses, Beginning balance	630	651
Provision	(60)	(35)
Allowance for loan losses, Ending balance	570	616
Commercial & Industrial
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for loan losses, Beginning balance	946	807
Charge-offs	(5)
Recoveries	11	3
Provision	193	(152)
Allowance for loan losses, Ending balance	1,145	658
Consumer
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for loan losses, Beginning balance	315	264
Charge-offs	(5)	(7)
Recoveries	2	2
Provision	(14)	10
Allowance for loan losses, Ending balance	298	269
Impaired
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for loan losses, Beginning balance	93	190
Provision	(3)	118
Allowance for loan losses, Ending balance	$ 90	$ 308

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Loans and the Allowance for Loan Losses - Summary of Allowance for Loan Losses and Related Loans Receivable Disaggregated by Impairment Method (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Financing Receivable Allowance For Credit Losses [Line Items]
Individually evaluated for impairment	$ 90	$ 93
Collectively evaluated for impairment	15,642	15,227
Allowance for loan losses	15,732	15,320
Individually evaluated for impairment	1,524	1,296
Collectively evaluated for impairment	1,380,230	1,349,603
Loans receivable	1,381,754	1,350,899
Residential Mortgage
Financing Receivable Allowance For Credit Losses [Line Items]
Individually evaluated for impairment	90	93
Collectively evaluated for impairment	4,692	5,047
Allowance for loan losses	4,782	5,140
Individually evaluated for impairment	1,220	968
Collectively evaluated for impairment	540,379	537,952
Loans receivable	541,599	538,920
Commercial Mortgage
Financing Receivable Allowance For Credit Losses [Line Items]
Collectively evaluated for impairment	8,937	8,289
Allowance for loan losses	8,937	8,289
Individually evaluated for impairment	213	213
Collectively evaluated for impairment	656,076	633,436
Loans receivable	656,289	633,649
Home Equity
Financing Receivable Allowance For Credit Losses [Line Items]
Collectively evaluated for impairment	570	630
Allowance for loan losses	570	630
Individually evaluated for impairment	68	86
Collectively evaluated for impairment	71,524	74,358
Loans receivable	71,592	74,444
Commercial & Industrial
Financing Receivable Allowance For Credit Losses [Line Items]
Collectively evaluated for impairment	1,145	946
Allowance for loan losses	1,145	946
Individually evaluated for impairment	23	29
Collectively evaluated for impairment	75,342	65,266
Loans receivable	75,365	65,295
Consumer
Financing Receivable Allowance For Credit Losses [Line Items]
Collectively evaluated for impairment	298	315
Allowance for loan losses	298	315
Collectively evaluated for impairment	36,909	38,591
Loans receivable	$ 36,909	$ 38,591

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Income Taxes - Additional Information (Details) - USD ($)	3 Months Ended		12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Statutory federal tax rate	21.00%		35.00%
Effective tax rate	21.80%	31.40%
Net deferred tax assets	$ 7,910,000		$ 8,273,000
Deferred tax assets, valuation allowance	$ 0

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Income Taxes - Components of Income Tax Expense (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Current
Federal	$ 593	$ 932
State	253	234
Total current expense	846	1,166
Deferred
Federal	524	637
State	246	181
Total deferred	770	818
Total income tax expense	$ 1,616	$ 1,984

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Pension and Retirement Plans - Components of Net Periodic Benefit Cost (Credit) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Pension Plan
Net periodic benefit cost
Service cost		$ 447
Interest cost	$ 386	545
Expected return on assets	(723)	(818)
Amortization of prior service cost (credit)	(1)	(1)
Amortization of net actuarial loss	16	237
Net periodic benefit cost (credit)	(322)	410
Supplemental Retirement Plan
Net periodic benefit cost
Service cost	89	67
Interest cost	77	91
Amortization of net actuarial loss	1
Net periodic benefit cost (credit)	167	158
Postretirement Healthcare Plan
Net periodic benefit cost
Service cost	6	4
Interest cost	5	5
Amortization of net actuarial loss	5	(2)
Net periodic benefit cost (credit)	$ 16	$ 7

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Pension and Retirement Plans - Additional Information (Details) - USD ($)	3 Months Ended		9 Months Ended	12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017
Profit Sharing Plan | 401(k)
Defined Benefit Plan Disclosure [Line Items]
Defined contribution plan, maximum employee contribution, percent	100.00%
Profit Sharing Plan | 401(k) | Maximum
Defined Benefit Plan Disclosure [Line Items]
Defined contribution plan, employer matching contribution, percent	4.00%
Profit Sharing Plan | 401(k) | Minimum
Defined Benefit Plan Disclosure [Line Items]
Defined contribution plan, employer matching contribution, percent				3.00%
Profit Sharing Plan | Discretionary Contribution
Defined Benefit Plan Disclosure [Line Items]
Defined contribution plan, employer matching contribution, percent	4.00%
Employee Stock Ownership Plan (ESOP)
Defined Benefit Plan Disclosure [Line Items]
Employee eligibility age under the plan	21 years
Defined contribution plan, minimum service period required for eligibility	12 months
Defined contribution plan, minimum number of hours of service per year required for eligibility	1000 hours
Profit Sharing and ESOP Plans
Defined Benefit Plan Disclosure [Line Items]
Contribution expense related to Plans	$ 823,000,000	$ 238,000,000
Qualified Defined Benefit Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Contributions to defined benefit pension plan	$ 0
Qualified Defined Benefit Pension Plan | Scenario Forecast
Defined Benefit Plan Disclosure [Line Items]
Contributions to defined benefit pension plan			$ 0

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Stock Based Compensation - Schedule of Shares Issued and Fair Value of RSAs and RSUs (Details) - 2017 Equity and Cash Incentive Plan	3 Months Ended
	Mar. 31, 2018 $ / shares shares
RSAs
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares Granted | shares	11,838
Weighted Average Fair Value at Grant Date | $ / shares	$ 76.71
RSUs
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares Granted | shares	7,839
Weighted Average Fair Value at Grant Date | $ / shares	$ 76.56

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Stock Based Compensation - Additional Information (Details) - Performance Based Restricted Stock Units - Executive Level Employees - 2017 Equity and Cash Incentive Plan	Jan. 22, 2018 $ / shares shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Performance-based restricted stock units granted | shares	23,511
Performance-based restricted stock units grant date fair value | $ / shares	$ 76.56
Performance-based restricted stock units performance period	3 years

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Stock Based Compensation - Schedule of Pre-tax Expense Associated with All Outstanding Non-vested RSAs, RSUs, Performance Based Restricted Stock Units and Related Tax Benefits (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Share Based Compensation [Abstract]
Stock based compensation expense	$ 540	$ 273
Related tax benefits	$ 152	$ 112

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Financial Instruments with Off-Balance-Sheet Risk - Summary of Off-Balance-Sheet Financial Instruments with Contractual Amounts Include Present Credit Risk (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Interest Rate Swap with Customers
Financial instruments whose notional amount exceeds the amount of credit risk:
Financial instrument notional amount exceeds credit risk	$ 78,967	$ 74,758
Mirror Swaps with Counterparties
Financial instruments whose notional amount exceeds the amount of credit risk:
Financial instrument notional amount exceeds credit risk	78,967	74,758
Standby Letters of Credit
Financial instruments whose contractual amount represents credit risk:
Financial instruments with off-balance-sheet risk	8,669	8,322
Unused Portion of Existing Lines of Credit
Financial instruments whose contractual amount represents credit risk:
Financial instruments with off-balance-sheet risk	313,313	304,298
Origination of New Loans
Financial instruments whose contractual amount represents credit risk:
Financial instruments with off-balance-sheet risk	34,392	45,061
Commitments to Sell Residential Mortgage Loans
Financial instruments whose notional amount exceeds the amount of credit risk:
Financial instrument notional amount exceeds credit risk	1,124	1,490
Risk Participation Agreements with Counterparties
Financial instruments whose notional amount exceeds the amount of credit risk:
Financial instrument notional amount exceeds credit risk	$ 39,095	$ 38,494

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Shareholders' Equity - Minimum Capital Requirements were Considered Well Capitalized by FRB and FDIC (Details) - USD ($)	Mar. 31, 2018	Dec. 31, 2017
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]
Total capital (to risk-weighted assets), Actual, Amount	$ 174,684,000	$ 168,615,000
Tier I capital (to risk-weighted assets), Actual, Amount	158,950,000	153,281,000
Common equity tier I capital (to risk-weighted assets), Actual, Amount	158,950,000	153,281,000
Tier I capital (to average assets), Actual, Amount	$ 158,950,000	$ 153,281,000
Total capital (to risk-weighted assets), Actual, Ratio	13.90%	13.70%
Tier I capital (to risk-weighted assets), Actual, Ratio	12.60%	12.50%
Common equity tier I capital (to risk-weighted assets), Actual, Ratio	12.60%	12.50%
Tier I capital (to average assets), Actual, Ratio	8.10%	8.10%
Total capital (to risk-weighted assets), Minimum Capital Required For Capital Adequacy, Amount	$ 100,692,000	$ 98,136,000
Tier I capital (to risk-weighted assets), Minimum Capital Required For Capital Adequacy, Amount	75,519,000	73,602,000
Common equity tier I capital (to risk-weighted assets), Minimum Capital Required For Capital Adequacy, Amount	56,639,000	55,202,000
Tier I capital (to average assets), Minimum Capital Required For Capital Adequacy, Amount	$ 78,043,000	$ 76,026,000
Total capital (to risk-weighted assets), Minimum Capital Required For Capital Adequacy, Ratio	8.00%	8.00%
Tier I capital (to risk-weighted assets), Minimum Capital Required For Capital Adequacy, Ratio	6.00%	6.00%
Common equity tier I capital (to risk-weighted assets), Minimum Capital Required For Capital Adequacy, Ratio	4.50%	4.50%
Tier I capital (to average assets), Minimum Capital Required For Capital Adequacy, Ratio	4.00%	4.00%
Minimum
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]
Total capital (to risk-weighted assets), Minimum Capital Required For Capital Adequacy Plus Capital Conservation Buffer Basel III Phase-In Schedule, Amount	$ 124,292,000	$ 113,470,000
Tier I capital (to risk-weighted assets), Minimum Capital Required For Capital Adequacy Plus Capital Conservation Buffer Basel III Phase-In Schedule, Amount	99,119,000	88,936,000
Common equity tier I capital (to risk-weighted assets), Minimum Capital Required For Capital Adequacy Plus Capital Conservation Buffer Basel III Phase-In Schedule, Amount	80,239,000	70,535,000
Tier I capital (to average assets), Minimum Capital Required For Capital Adequacy Plus Capital Conservation Buffer Basel III Phase-In Schedule, Amount	$ 78,043,000	$ 76,026,000
Total capital (to risk-weighted assets), Minimum Capital Required For Capital Adequacy Plus Capital Conservation Buffer Basel III Phase-In Schedule, Ratio	9.875%	9.25%
Tier I capital (to risk-weighted assets), Minimum Capital Required For Capital Adequacy Plus Capital Conservation Buffer Basel III Phase-In Schedule, Ratio	7.875%	7.25%
Common equity tier I capital (to risk-weighted assets), Minimum Capital Required For Capital Adequacy Plus Capital Conservation Buffer Basel III Phase-In Schedule, Ratio	6.375%	5.75%
Tier I capital (to average assets), Minimum Capital Required For Capital Adequacy Plus Capital Conservation Buffer Basel III Phase-In Schedule, Ratio	4.00%	4.00%
Total capital (to risk-weighted assets), Minimum Capital Required For Capital Adequacy Plus Capital Conservation Buffer Basel III Fully Phased In, Amount	$ 132,159,000	$ 128,804,000
Tier I capital (to risk-weighted assets), Minimum Capital Required For Capital Adequacy Plus Capital Conservation Buffer Basel III Fully Phased In, Amount	106,986,000	104,270,000
Common equity tier I capital (to risk-weighted assets), Minimum Capital Required For Capital Adequacy Plus Capital Conservation Buffer Basel III Fully Phased In, Amount	88,106,000	85,869,000
Tier I capital (to average assets), Minimum Capital Required For Capital Adequacy Plus Capital Conservation Buffer Basel III Fully Phased In, Amount	$ 78,043,000	$ 76,026,000
Total capital (to risk-weighted assets), Minimum Capital Required For Capital Adequacy Plus Capital Conservation Buffer Basel III Fully Phased In, Ratio	10.50%	10.50%
Tier I capital (to risk-weighted assets), Minimum Capital Required For Capital Adequacy Plus Capital Conservation Buffer Basel III Fully Phased In, Ratio	8.50%	8.50%
Common equity tier I capital (to risk-weighted assets), Minimum Capital Required For Capital Adequacy Plus Capital Conservation Buffer Basel III Fully Phased In, Ratio	7.00%	7.00%
Tier I capital (to average assets), Minimum Capital Required For Capital Adequacy Plus Capital Conservation Buffer Basel III Fully Phased In, Ratio	4.00%	4.00%
Cambridge Trust Company
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]
Total capital (to risk-weighted assets), Actual, Amount	$ 170,546,000	$ 164,880,000
Tier I capital (to risk-weighted assets), Actual, Amount	154,812,000	149,546,000
Common equity tier I capital (to risk-weighted assets), Actual, Amount	154,812,000	149,546,000
Tier I capital (to average assets), Actual, Amount	$ 154,812,000	$ 149,546,000
Total capital (to risk-weighted assets), Actual, Ratio	13.50%	13.40%
Tier I capital (to risk-weighted assets), Actual, Ratio	12.30%	12.20%
Common equity tier I capital (to risk-weighted assets), Actual, Ratio	12.30%	12.20%
Tier I capital (to average assets), Actual, Ratio	7.90%	7.90%
Total capital (to risk-weighted assets), Minimum Capital Required For Capital Adequacy, Amount	$ 100,692,000	$ 98,136,000
Tier I capital (to risk-weighted assets), Minimum Capital Required For Capital Adequacy, Amount	75,519,000	73,602,000
Common equity tier I capital (to risk-weighted assets), Minimum Capital Required For Capital Adequacy, Amount	56,639,000	55,202,000
Tier I capital (to average assets), Minimum Capital Required For Capital Adequacy, Amount	$ 78,043,000	$ 76,026,000
Total capital (to risk-weighted assets), Minimum Capital Required For Capital Adequacy, Ratio	8.00%	8.00%
Tier I capital (to risk-weighted assets), Minimum Capital Required For Capital Adequacy, Ratio	6.00%	6.00%
Common equity tier I capital (to risk-weighted assets), Minimum Capital Required For Capital Adequacy, Ratio	4.50%	4.50%
Tier I capital (to average assets), Minimum Capital Required For Capital Adequacy, Ratio	4.00%	4.00%
Cambridge Trust Company | Minimum
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]
Total capital (to risk-weighted assets), Minimum Capital Required For Capital Adequacy Plus Capital Conservation Buffer Basel III Phase-In Schedule, Amount	$ 124,292,000	$ 113,470,000
Tier I capital (to risk-weighted assets), Minimum Capital Required For Capital Adequacy Plus Capital Conservation Buffer Basel III Phase-In Schedule, Amount	99,119,000	88,936,000
Common equity tier I capital (to risk-weighted assets), Minimum Capital Required For Capital Adequacy Plus Capital Conservation Buffer Basel III Phase-In Schedule, Amount	80,239,000	70,535,000
Tier I capital (to average assets), Minimum Capital Required For Capital Adequacy Plus Capital Conservation Buffer Basel III Phase-In Schedule, Amount	$ 78,043,000	$ 76,026,000
Total capital (to risk-weighted assets), Minimum Capital Required For Capital Adequacy Plus Capital Conservation Buffer Basel III Phase-In Schedule, Ratio	9.875%	9.25%
Tier I capital (to risk-weighted assets), Minimum Capital Required For Capital Adequacy Plus Capital Conservation Buffer Basel III Phase-In Schedule, Ratio	7.875%	7.25%
Common equity tier I capital (to risk-weighted assets), Minimum Capital Required For Capital Adequacy Plus Capital Conservation Buffer Basel III Phase-In Schedule, Ratio	6.375%	5.75%
Tier I capital (to average assets), Minimum Capital Required For Capital Adequacy Plus Capital Conservation Buffer Basel III Phase-In Schedule, Ratio	4.00%	4.00%
Total capital (to risk-weighted assets), Minimum Capital Required For Capital Adequacy Plus Capital Conservation Buffer Basel III Fully Phased In, Amount	$ 132,159,000	$ 128,804,000
Tier I capital (to risk-weighted assets), Minimum Capital Required For Capital Adequacy Plus Capital Conservation Buffer Basel III Fully Phased In, Amount	106,986,000	104,270,000
Common equity tier I capital (to risk-weighted assets), Minimum Capital Required For Capital Adequacy Plus Capital Conservation Buffer Basel III Fully Phased In, Amount	88,106,000	85,869,000
Tier I capital (to average assets), Minimum Capital Required For Capital Adequacy Plus Capital Conservation Buffer Basel III Fully Phased In, Amount	$ 78,043,000	$ 76,026,000
Total capital (to risk-weighted assets), Minimum Capital Required For Capital Adequacy Plus Capital Conservation Buffer Basel III Fully Phased In, Ratio	10.50%	10.50%
Tier I capital (to risk-weighted assets), Minimum Capital Required For Capital Adequacy Plus Capital Conservation Buffer Basel III Fully Phased In, Ratio	8.50%	8.50%
Common equity tier I capital (to risk-weighted assets), Minimum Capital Required For Capital Adequacy Plus Capital Conservation Buffer Basel III Fully Phased In, Ratio	7.00%	7.00%
Tier I capital (to average assets), Minimum Capital Required For Capital Adequacy Plus Capital Conservation Buffer Basel III Fully Phased In, Ratio	4.00%	4.00%
Total capital (to risk-weighted assets), Minimum To Be Well-Capitalized Under Prompt Corrective Action Provisions, Amount	$ 125,866,000	$ 122,670,000
Tier I capital (to risk-weighted assets), Minimum To Be Well-Capitalized Under Prompt Corrective Action Provisions, Amount	100,692,000	98,136,000
Common equity tier I capital (to risk-weighted assets), Minimum To Be Well-Capitalized Under Prompt Corrective Action Provisions, Amount	81,813,000	79,736,000
Tier I capital (to average assets), Minimum To Be Well-Capitalized Under Prompt Corrective Action Provisions, Amount	$ 97,554,000	$ 95,033,000
Total capital (to risk-weighted assets), Minimum To Be Well-Capitalized Under Prompt Corrective Action Provisions, Ratio	10.00%	10.00%
Tier I capital (to risk-weighted assets), Minimum To Be Well-Capitalized Under Prompt Corrective Action Provisions, Ratio	8.00%	8.00%
Common equity tier I capital (to risk-weighted assets), Minimum To Be Well-Capitalized Under Prompt Corrective Action Provisions, Ratio	6.50%	6.50%
Tier I capital (to average assets), Minimum To Be Well-Capitalized Under Prompt Corrective Action Provisions, Ratio	5.00%	5.00%

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Other Comprehensive Income - Summary of Other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Unrealized gains/(losses) on available for sale securities, before tax amount
Unrealized holding gains/(losses) arising during the period, before tax amount	$ (1,678)	$ 292
Reclassification adjustment for (gains)/losses recognized in net income, before tax amount		2
Defined benefit retirement plans, before tax amount
Change in retirement liability, before tax amount	14	224
Total Other Comprehensive Income (Loss), before tax amount	(1,664)	518
Unrealized gains/(losses) on available for sale securities, tax (expense) or benefit
Unrealized holding gains/(losses) arising during the period, tax (expense) or benefit	326	(103)
Reclassification adjustment for (gains)/losses recognized in net income, tax (expense) or benefit		(1)
Defined benefit retirement plans, tax (expense) or benefit
Change in retirement liability, tax (expense) or benefit	(4)	(92)
Total Other Comprehensive Income (Loss) tax (expense) or benefit	322	(196)
Unrealized gains/(losses) on available for sale securities
Unrealized holding gains/(losses) arising during the period, net-of-tax amount	(1,352)	189
Reclassification adjustment for (gains)/losses recognized in net income, net-of-tax amount		1
Defined benefit retirement plans
Change in retirement liability, net-of-tax amount	10	132
Other comprehensive income/(loss)	$ (1,342)	$ 322

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Other Comprehensive Income - Summary of Reclassifications out of Accumulated Other Comprehensive Income ("AOCI") (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Unrealized gains and losses on available for sale securities		$ (2)
Tax benefit or (expense)	$ (1,616)	(1,984)
Net income	$ 5,805	4,328
Reclassifications out of Accumulated Other Comprehensive Income
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Unrealized gains and losses on available for sale securities		(2)
Tax benefit or (expense)		1
Net income		$ (1)

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Earnings Per Share - Summary of Reconciliation Between Basic and Diluted Earnings Per Share (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Numerator:
Net income	$ 5,805	$ 4,328
Less dividends and undistributed earnings allocated to participating securities	(64)	(47)
Net income applicable to common shareholders	$ 5,741	$ 4,281
Denominator:
Weighted average number of shares outstanding, basic	4,053,355	4,011,925
Earnings per common share - basic	$ 1.42	$ 1.07
Numerator:
Net income	$ 5,805	$ 4,328
Less dividends and undistributed earnings allocated to participating securities	(64)	(47)
Net income applicable to common shareholders	$ 5,741	$ 4,281
Denominator:
Weighted average number of shares outstanding, basic	4,053,355	4,011,925
Dilutive effect of common stock equivalents	19,000	39,000
Weighted average number of shares outstanding, diluted	4,071,975	4,050,791
Diluted earnings per share	$ 1.41	$ 1.06

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Derivative Financial Instruments - Additional Information (Details) - USD ($)	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Loan related derivative income	$ 472,000	$ 188,000
Interest Rate Swap Contracts | Commercial Loan Borrowers
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Derivative, notional amount	79,000,000		$ 74,800,000
Mirror Swap Contracts | Third-Party Financial Institutions
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Derivative, notional amount	79,000,000		74,800,000
Risk Participation-In Agreements
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Derivative, notional amount	39,100,000		38,500,000
Risk Participation-Out Agreements
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Derivative, notional amount	$ 0		$ 0

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Derivative Financial Instruments - Summary of Fair Values of Derivative Instruments in the Company's Unaudited Consolidated Balance Sheets (Details) - Loan Related Derivative Contracts - Derivatives Not Designated as Hedging Instruments - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Derivative assets	$ 3,253	$ 1,859
Derivative liabilities	3,307	1,940
Interest Rate Swap Contracts
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Derivative assets	3,253	1,859
Mirror Swaps with Counterparties
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Derivative liabilities	3,253	1,859
Risk Participation Agreements
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Derivative liabilities	$ 54	$ 81

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Fair Value Measurements - Summary of Carrying Values and Estimated Fair Values of Financial Instruments (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Financial assets
Securities available for sale	$ 197,935	$ 205,017
Securities held to maturity	262,432	233,554
FHLB Boston stock	4,242	4,242
Bank owned life insurance	30,535	31,083
Recurring Basis | Carrying Value
Financial assets
Cash and cash equivalents	56,265	103,591
Securities available for sale	197,935	205,017
Securities held to maturity	264,409	232,188
Loans, net	1,366,022	1,335,579
FHLB Boston stock	4,242	4,242
Bank owned life insurance	30,535	31,083
Accrued interest receivable	5,059	5,128
Mortgage servicing rights	760	793
Loan level interest rate swaps	3,253	1,859
Financial liabilities
Deposits	1,782,392	1,775,400
Long-term borrowings	3,537	3,579
Loan level interest rate swaps	3,253	1,859
Risk participation agreements	54	81
Recurring Basis | Estimated Fair Value
Financial assets
Cash and cash equivalents	56,265	103,591
Securities available for sale	197,935	205,017
Securities held to maturity	262,432	233,554
Loans, net	1,320,509	1,304,719
FHLB Boston stock	4,242	4,242
Bank owned life insurance	30,535	31,083
Accrued interest receivable	5,059	5,128
Mortgage servicing rights	1,049	1,049
Loan level interest rate swaps	3,253	1,859
Financial liabilities
Deposits	1,779,459	1,772,838
Long-term borrowings	3,486	3,559
Loan level interest rate swaps	3,253	1,859
Risk participation agreements	$ 54	$ 81

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Fair Value Measurements - Summary of Certain Assets Reported at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Securities available for sale	$ 197,935	$ 205,017
U.S. GSE Obligations
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Securities available for sale	88,423	88,791
Corporate Debt Securities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Securities available for sale	4,945	5,001
Mutual Funds
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Securities available for sale	587	599
Recurring Basis | U.S. GSE Obligations
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Securities available for sale	88,423	88,791
Recurring Basis | Mortgage Backed Securities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Securities available for sale	103,980	110,626
Recurring Basis | Corporate Debt Securities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Securities available for sale	4,945	5,001
Recurring Basis | Mutual Funds
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Securities available for sale	587	599
Recurring Basis | Interest Rate Swap Contracts
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Other assets	3,253	1,859
Recurring Basis | Mirror Swaps with Counterparties
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Other liabilities	3,253	1,859
Recurring Basis | Risk Participation Agreements
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Other liabilities	54	81
Recurring Basis | Level 1 | Mutual Funds
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Securities available for sale	587	599
Recurring Basis | Level 2 | U.S. GSE Obligations
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Securities available for sale	88,423	88,791
Recurring Basis | Level 2 | Mortgage Backed Securities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Securities available for sale	103,980	110,626
Recurring Basis | Level 2 | Corporate Debt Securities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Securities available for sale	4,945	5,001
Recurring Basis | Level 2 | Interest Rate Swap Contracts
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Other assets	3,253	1,859
Recurring Basis | Level 2 | Mirror Swaps with Counterparties
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Other liabilities	3,253	1,859
Recurring Basis | Level 2 | Risk Participation Agreements
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Other liabilities	$ 54	$ 81

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Fair Value Measurements - Additional Information (Detail) - USD ($)	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Fair Value Disclosures [Abstract]
Assets, fair value, non-recurring basis	$ 0		$ 0
Transfers between levels	$ 0	$ 0