10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

Form 10-K

(Mark One)
☑	ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
	For the fiscal year ended December 31, 2016
☐	TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
	For the transition period from                to

Commission file number 0-15752

CENTURY BANCORP, INC.

(Exact name of registrant as specified in its charter)

COMMONWEALTH OF MASSACHUSETTS	04-2498617
(State or other jurisdiction of incorporation or organization)	(I.R.S. Employer Identification number)
400 MYSTIC AVENUE, MEDFORD, MA	02155
(Address of principal executive offices)	(Zip Code)

Registrant’s telephone number including area code:

(781) 391-4000

Securities registered pursuant to Section 12(b) of the Act:

Class A Common Stock, $1.00 par value	Nasdaq Global Market
(Title of class)	(Name of Exchange)

Indicate by check mark whether the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act.    Yes  ☐    No  ☑

Indicate by check mark whether the registrant is not required to file reports pursuant to Section 13 or Section 15(d) of the Act.    Yes  ☐    No  ☑

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 Regulations 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 if disclosure of delinquent filers pursuant to Item 405 of Regulation S-K is not contained herein, and will not be contained, to the best of registrant’s knowledge, in definitive proxy or information statements incorporated by reference in Part III of this Form 10-K or any amendment to this Form 10-K    ☐

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

Large accelerated filer    ☐	Accelerated filer    ☑	Non-accelerated filer     ☐	Smaller reporting company    ☐
		(Do not check if a smaller reporting company)

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

State the aggregate market value of the registrant’s voting and nonvoting stock held by nonaffiliates, computed using the closing price as reported on Nasdaq as of June 30, 2016 was $153,423,815.

Indicate the number of shares outstanding of each of the registrant’s classes of common stock as of February 28, 2017:

Class A Common Stock, $1.00 par value 3,600,729 Shares

Class B Common Stock, $1.00 par value 1,967,180 Shares

DOCUMENTS INCORPORATED BY REFERENCE

List hereunder the following documents if incorporated by reference and the Part of the Form 10-K (e.g., Part I, Part II, etc.) into which the document is incorporated: (1) Any annual report to security holders; (2) Any proxy or information statement; and (3) Any prospectus filed pursuant to Rule 424(b) or (c) under the Securities Act of 1933. The listed documents should be clearly described for identification purposes (e.g., annual report to security holders for fiscal year ended December 24, 1980).

(1) Portions of the Registrant’s Annual Report to Stockholders for the fiscal year ended December 31, 2016 are incorporated into Part II, Items 5-8 of this Form 10-K.

CENTURY BANCORP INC.

FORM 10-K

TABLE OF CONTENTS

		Page
	PART I
ITEM 1	BUSINESS		1-5
ITEM 1A	RISK FACTORS		5-6
ITEM 1B	UNRESOLVED STAFF COMMENTS		6
ITEM 2	PROPERTIES		6
ITEM 3	LEGAL PROCEEDINGS		6
ITEM 4	MINE SAFETY DISCLOSURES		6
	PART II
ITEM 5	MARKET FOR REGISTRANT’S COMMON EQUITY, RELATED STOCKHOLDER MATTERS AND ISSUER PURCHASES OF EQUITY SECURITIES		7-8
ITEM 6	SELECTED FINANCIAL DATA		8
ITEM 7	MANAGEMENT’S DISCUSSION AND ANALYSIS OF RESULTS OF OPERATIONS AND FINANCIAL CONDITION		8
ITEM 7A	QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK		8
ITEM 8	FINANCIAL STATEMENTS AND SUPPLEMENTARY DATA		8
ITEM 9	CHANGES IN AND DISAGREEMENTS WITH ACCOUNTANTS ON ACCOUNTING AND FINANCIAL DISCLOSURE		8
ITEM 9A	CONTROLS AND PROCEDURES		8
ITEM 9B	OTHER INFORMATION		9
	PART III
ITEM 10	DIRECTORS, EXECUTIVE OFFICERS AND CORPORATE GOVERNANCE		92-96
ITEM 11	EXECUTIVE COMPENSATION		96-106
ITEM 12	SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND MANAGEMENT AND RELATED STOCKHOLDER MATTERS		107-108
ITEM 13	CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS AND DIRECTOR INDEPENDENCE		108
ITEM 14	PRINCIPAL ACCOUNTING FEES AND SERVICES		108
	PART IV
ITEM 15	EXHIBITS AND FINANCIAL STATEMENT SCHEDULES		109-110
ITEM 16	FORM 10-K SUMMARY		110
SIGNATURES			111

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PART I

ITEM 1.    BUSINESS

The Company

Century Bancorp, Inc. (together with its bank subsidiary, unless the context otherwise requires, the “Company”) is a Massachusetts state-chartered bank holding company headquartered in Medford, Massachusetts. The Company is a Massachusetts corporation formed in 1972 and has one banking subsidiary (the “Bank”): Century Bank and Trust Company formed in 1969. At December 31, 2016, the Company had total assets of $4.5 billion. Currently, the Company operates 27 banking offices in 20 cities and towns in Massachusetts, ranging from Braintree in the south to Andover in the north. The Bank’s customers consist primarily of small and medium-sized businesses and retail customers in these communities and surrounding areas, as well as local governments and institutions throughout Massachusetts, New Hampshire, Rhode Island, Connecticut, and New York.

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. The results of operations are also 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 and the relative levels of interest rates and economic activity.

The Company offers a wide range of services to commercial enterprises, state and local governments and agencies, non-profit organizations and individuals. It emphasizes service to small and medium-sized businesses and retail customers in its market area. The Company makes commercial loans, real estate and construction loans and consumer loans, and accepts savings, time, and demand deposits. In addition, the Company offers to its corporate and institutional customers automated lock box collection services, cash management services and account reconciliation services, and actively promotes the marketing of these services to the municipal market. Also, the Company provides full service securities brokerage services through a program called Investment Services at Century Bank, which is supported by LPL Financial, a third party full-service securities brokerage business.

The Company has municipal cash management client engagements in Massachusetts, New Hampshire and Rhode Island comprised of approximately 250 government entities.

Availability of Company Filings

Under the Securities Exchange Act of 1934, Sections 13 and 15(d), periodic and current reports must be filed with the Securities and Exchange Commission (the “SEC”). The public may read and copy any materials filed with the SEC at the SEC’s Public Reference Room at 100 F Street, NE, Washington, DC 20549. The public may obtain information on the operation of the Public Reference Room by calling the SEC at 1-800-SEC-0030. The Company electronically files with the SEC its periodic and current reports, as well as other filings it makes with the SEC from time to time. The SEC maintains an Internet site that contains reports and other information regarding issuers, including the Company, that file electronically with the SEC, at www.sec.gov, in which all forms filed electronically may be accessed. Additionally, our annual report on Form 10-K, quarterly reports on Form 10-Q and current reports on Form 8-K and additional shareholder information are available free of charge on the Company’s website: www.centurybank.com.

Employees

As of December 31, 2016, the Company had 372 full-time and 66 part-time employees. The Company’s employees are not represented by any collective bargaining unit. The Company believes that its employee relations are good.

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Financial Services Modernization

On November 12, 1999, President Clinton signed into law The Gramm-Leach-Bliley Act (“Gramm-Leach”) which significantly altered banking laws in the United States. Gramm-Leach enables combinations among banks, securities firms and insurance companies beginning March 11, 2000. As a result of Gramm Leach, many of the depression-era laws that restricted these affiliations and other activities that may be engaged in by banks and bank holding companies were repealed. Under Gramm-Leach, bank holding companies are permitted to offer their customers virtually any type of financial service that is financial in nature or incidental thereto, including banking, securities underwriting, insurance (both underwriting and agency) and merchant banking.

In order to engage in these financial activities, a bank holding company must qualify and register with the Federal Reserve Board as a “financial holding company” by demonstrating that each of its bank subsidiaries is “well capitalized,” “well managed,” and has at least a “satisfactory” rating under the Community Reinvestment Act of 1977 (the “CRA”). The Company has not elected to become a financial holding company under Gramm-Leach.

These financial activities authorized by Gramm-Leach may also be engaged in by a “financial subsidiary” of a national or state bank, except for insurance or annuity underwriting, insurance company portfolio investments, real estate investment and development and merchant banking, which must be conducted in a financial holding company. In order for the new financial activities to be engaged in by a financial subsidiary of a national or state bank, Gramm-Leach requires each of the parent bank (and any bank affiliates) to be “well capitalized” and “well managed;” the aggregate consolidated assets of all of that bank’s financial subsidiaries may not exceed the lesser of 45% of its consolidated total assets or $50 billion; the bank must have at least a satisfactory CRA rating; and, if the bank is one of the 100 largest banks, it must meet certain financial rating or other comparable requirements. The Company does not currently conduct activities through a financial subsidiary.

Gramm-Leach establishes a system of functional regulation, under which the federal banking agencies will regulate the banking activities of financial holding companies and banks’ financial subsidiaries, the SEC will regulate their securities activities, and state insurance regulators will regulate their insurance activities. Gramm-Leach also provides new protections against the transfer and use by financial institutions of consumers’ nonpublic, personal information.

Holding Company Regulation

The Company is a bank holding company as defined by the Bank Holding Company Act of 1956, as amended (the “Holding Company Act”), and is registered as such with the Board of Governors of the Federal Reserve Bank (the “FRB”), which is responsible for administration of the Holding Company Act. Although the Company may meet the qualifications for electing to become a financial holding company under Gramm-Leach, the Company has elected to retain its pre-Gramm-Leach status for the present time under the Holding Company Act. As required by the Holding Company Act, the Company files with the FRB an annual report regarding its financial condition and operations, management and intercompany relationships of the Company and the Bank. It is also subject to examination by the FRB and must obtain FRB approval before (i) acquiring direct or indirect ownership or control of more than 5% of the voting stock of any bank, unless it already owns or controls a majority of the voting stock of that bank, (ii) acquiring all or substantially all of the assets of a bank, except through a subsidiary which is a bank, or (iii) merging or consolidating with any other bank holding company. A bank holding company must also give the FRB prior written notice before purchasing or redeeming its equity securities, if the gross consideration for the purchase or redemption, when aggregated with the net consideration paid by the company for all such purchases or redemptions during the preceding 12 months, is equal to 10% or more of the company’s consolidated net worth.

The Holding Company Act prohibits a bank holding company, with certain exceptions, from (i) acquiring direct or indirect ownership or control of more than 5% of any class of voting shares of any company which is not a bank or a bank holding company, or (ii) engaging in any activity other than managing or controlling banks, or furnishing services to or performing services for its subsidiaries. A bank holding company may own, however, shares of a company engaged in activities which the FRB has determined are so closely related to banking or managing or controlling banks as to be a proper incident thereto.

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The Company and its subsidiaries are examined by federal and state regulators. The FRB has regulatory authority over holding company activities and performed a review of the Company and its subsidiaries as of September 2016.

USA PATRIOT Act

Under Title III of the USA PATRIOT Act, also known as the “International Money Laundering Abatement and Anti-Terrorism Act of 2001”, all financial institutions are required in general to identify their customers, adopt formal and comprehensive anti-money laundering programs, scrutinize or prohibit altogether certain transactions of special concern, and be prepared to respond to inquiries from U.S. law enforcement agencies concerning their customers and their transactions. Additional information-sharing among financial institutions, regulators, and law enforcement authorities is encouraged by the presence of an exemption from the privacy provisions of the Gramm-Leach Act for financial institutions that comply with this provision and the authorization of the Secretary of the Treasury to adopt rules to further encourage cooperation and information-sharing. The effectiveness of a financial institution in combating money laundering activities is a factor to be considered in any application submitted by the financial institution under the Holding Company Act or Bank Merger Act.

Sarbanes-Oxley Act

The Sarbanes-Oxley Act, signed into law July 30, 2002, addresses, among other issues, corporate governance, auditor independence and accounting standards, executive compensation, insider loans, whistleblower protection and enhanced and timely disclosure of corporate information. The SEC has adopted a substantial number of implementing rules and the Financial Industry Regulatory Authority (FINRA) has adopted corporate governance rules that have been approved by the SEC and are applicable to the Company. The changes are intended to allow stockholders to monitor more effectively the performance of companies and management. As directed by Section 302(a) of the Sarbanes-Oxley Act, the Company’s Chief Executive Officer and Chief Financial Officer are each required to certify that the Company’s quarterly and annual reports do not contain any untrue statement of a material fact. This requirement has several parts, including certification that these officers are responsible for establishing, maintaining and regularly evaluating the effectiveness of the Company’s disclosure controls and procedures and internal controls over financial reporting; that they have made certain disclosures to the Company’s auditors and the Board of Directors about the Company’s disclosure controls and procedures and internal control over financial reporting, and that they have included information in the Company’s quarterly and annual reports about their evaluation of the Company’s disclosure controls and procedures and internal control over financial reporting, and whether there have been significant changes in the Company’s internal disclosure controls and procedures or in other factors that could significantly affect such controls and procedures subsequent to the evaluation and whether there have been any significant changes in the Company’s internal control over financial reporting that have materially affected or reasonably likely to materially affect the Company’s internal control over financial reporting, and compliance with certain other disclosure objectives. Section 906 of the Sarbanes-Oxley Act requires an additional certification that each periodic report containing financial statements fully complies with the requirements of Section 13(a) and 15(d) of the Securities Exchange Act of 1934 and that the information in the report fairly presents, in all material respects, the financial conditions and results of operations of the Company.

Dodd-Frank Wall Street Reform and Consumer Protection Act

On July 21, 2010, the Dodd-Frank Wall Street Reform and Consumer Protection Act (the “Act”) became law. The Act was intended to address many issues arising in the recent financial crisis and is exceedingly broad in scope, affecting many aspects of bank and financial market regulation. The Act requires, or permits by implementing regulation, enhanced prudential standards for banks and bank holding companies inclusive of capital, leverage, liquidity, concentration and exposure measures. In addition, traditional bank regulatory principles such as restrictions on transactions with affiliates and insiders were enhanced. The Act also contains reforms of consumer mortgage lending practices and creates a Bureau of Consumer Financial Protection, which is granted broad authority over consumer financial practices of banks and others. It is expected as the specific new or incremental requirements applicable to the Company become effective that the costs and difficulties of

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remaining compliant with all such requirements will increase. The Act broadened the base for FDIC assessments to average consolidated assets less tangible equity of financial institutions and also permanently raises the current standard maximum FDIC deposit insurance amount to $250,000. The Act extended unlimited deposit insurance on non-interest bearing transaction accounts through December 31, 2012. In addition, the Act added a new Section 13 to the Bank Holding Company Act, the so-called “Volcker Rule,” (the “Rule”) which generally restricts certain banking entities such as the Company and its subsidiaries or affiliates, from engaging in proprietary trading activities and owning equity in or sponsoring any private equity or hedge fund. The Rule became effective July 21, 2012. The final implementing regulations for the Rule were issued by various regulatory agencies in December, 2013 and under an extended conformance regulation compliance must be achieved by July 21, 2015. The conformance period for investments in and relationships with certain “legacy covered funds” has been extended to July 21, 2016 and is expected to be extended further to July 31, 2017. Under the Rule, the Company may be restricted from engaging in proprietary trading, investing in third party hedge or private equity funds or sponsoring new funds unless it qualifies for an exemption from the rule. The Company has little involvement in prohibited proprietary trading or investment activities in covered funds and the Company does not expect that complying with the requirements of the Rule will have any material effect on the Company’s financial condition or results of operation.

Deposit Insurance Premiums

The Bank’s deposits have the benefit of FDIC insurance up to applicable limits. The FDIC’s Deposit Insurance Fund is funded by assessments on insured depository institutions, which depend on the risk category of an institution and the amount of assets that it holds. The FDIC may increase or decrease the assessment rate schedule on a semi-annual basis.

On September 29, 2009, the FDIC adopted a Notice of Proposed Rulemaking (NPR) that would require insured institutions to prepay their estimated quarterly risk-based assessments for the fourth quarter of 2009 and for all of 2010, 2011 and 2012. The FDIC Board voted to adopt a uniform three-basis point increase in assessment rates effective on January 1, 2011, and extend the restoration period from seven to eight years. This rule was finalized on November 2, 2009. The Company’s quarterly risk-based deposit insurance assessments were paid from this amount until June 30, 2013. The Company received a refund of $2.4 million of prepaid FDIC assessments in June 2013.

In February 2011, the FDIC approved a rule to change the assessment base from adjusted domestic deposits to average consolidated total assets minus average tangible equity. The rule has kept the overall amount collected from the industry very close to the amount collected prior to the new calculation.

Risk-Based Capital Guidelines

Federal banking regulators have issued risk-based capital guidelines, which assign risk factors to asset categories and off-balance-sheet items. Also, the Basel Committee has issued capital standards entitled “Basel III: A global regulatory framework for more resilient banks and banking systems” (“Basel III”). The Federal Reserve Board has finalized its rule implementing the Basel III regulatory capital framework. The rule that came into effect in January 2015 sets the Basel III minimum regulatory capital requirements for all organizations. It includes a new common equity Tier I ratio of 4.5 percent of risk-weighted assets, raises the minimum Tier I capital ratio from 4 percent to 6 percent of risk-weighted assets and would set a new conservation buffer of 2.5 percent of risk-weighted assets. The implementation of the framework did not have a material impact on the Company’s financial condition or results of operations.

Competition

The Company experiences substantial competition in attracting deposits and making loans from commercial banks, thrift institutions and other enterprises such as insurance companies and mutual funds. These competitors include several major commercial banks whose greater resources may afford them a competitive advantage by enabling them to maintain numerous branch offices and mount extensive advertising campaigns. A number of these competitors are not subject to the regulatory oversight that the Company is subject to, which increases these competitors’ flexibility.

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Forward-Looking Statements

Certain statements contained herein are not based on historical facts and are “forward-looking statements” within the meaning of Section 21A of the Securities Exchange Act of 1934. Forward-looking statements, which are based on various assumptions (some of which are beyond the Company’s control), may be identified by reference to a future period or periods, or by the use of forward-looking terminology, such as “may,” “will,” “believe,” “expect,” “estimate,” “anticipate,” “continue” or similar terms or variations on those terms, or the negative of these terms. Actual results could differ materially from those set forth in forward-looking statements due to a variety of factors, including, but not limited to, those related to the economic environment, particularly in the market areas in which the Company operates, competitive products and pricing, fiscal and monetary policies of the U.S. Government, changes in government regulations affecting financial institutions, including regulatory fees and capital requirements, changes in prevailing interest rates, acquisitions and the integration of acquired businesses, credit risk management, asset/liability management, the financial and securities markets, and the availability of and costs associated with sources of liquidity.

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.

ITEM 1A.     RISK FACTORS

The risk factors that may affect the Company’s performance and results of operations include the following:

(i) the Company’s business is dependent upon general economic conditions in Massachusetts, New Hampshire, Rhode Island, Connecticut, and New York. The national and local economies may adversely affect the Company’s performance and results of operations;

(ii) the Company’s earnings depend, to a great extent, upon the level of net interest income generated by the Company, and therefore the Company’s results of operations may be adversely affected by increases or decreases in interest rates or by the shape of the yield curve;

(iii) the banking business is highly competitive and the profitability of the Company depends upon the Company’s ability to attract loans and deposits in Massachusetts, New Hampshire, Rhode Island, Connecticut, and New York, where the Company competes with a variety of traditional banking companies, some of which have vastly greater resources, and nontraditional institutions such as credit unions and finance companies; .

(iv) at December 31, 2016, approximately 68.0% of the Company’s loan portfolio was comprised of commercial and commercial real estate loans, exposing the Company to the risks inherent in financings based upon analyses of credit risk, the value of underlying collateral, including real estate, and other more intangible factors, which are considered in making commercial loans;

(v) at December 31, 2016, approximately 23.6% of the Company’s loan portfolio was comprised of residential real estate and home equity loans, exposing the Company to the risks inherent in financings based upon analyses of credit risk and the value of underlying collateral. Accordingly, the Company’s profitability may be negatively impacted by errors in risk analyses, by loan defaults and the ability of certain borrowers to repay such loans may be adversely affected by any downturn in general economic conditions;

(vi) economic conditions and interest rate risk could adversely impact the fair value and the ultimate collectibility of the Company’s investments. Should an investment be deemed “other than temporarily impaired”, the Company would be required to writedown the carrying value of the investment through earnings. Such writedown(s) may have a material adverse effect on the Company’s financial condition and results of operations;

(vii) writedown of goodwill and other identifiable intangible assets would negatively impact our financial condition and results of operations. At December 31, 2016, our goodwill and other identifiable intangible assets were approximately $2.7 million;

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(viii) acts or threats of terrorism and actions taken by the United States or other governments as a result of such acts or threats, including possible military action, could further adversely affect business and economic conditions in the United States of America generally and in the Company’s markets, which could adversely affect the Company’s financial performance and that of the Company’s borrowers and on the financial markets and the price of the Company’s Class A common stock;

(ix) changes in the extensive laws, regulations and policies governing bank holding companies and their subsidiaries could alter the Company’s business environment or affect the Company’s operations;

(x) the potential need to adapt to industry changes in information technology systems, on which the Company is highly dependent to secure bank and customer financial information, could present operational issues, require significant capital spending or impact the Company’s reputation; and

These factors, as well as general economic and market conditions in the United States of America, may materially and adversely affect the Company’s performance, results of operations and the market price of shares of the Company’s Class A common stock.

ITEM 1B.     UNRESOLVED STAFF COMMENTS

No written comments received by the Company from the SEC regarding the Company’s periodic or current reports remain unresolved.

ITEM 2.     PROPERTIES

The Company owns its main banking office, headquarters, and operations center in Medford, Massachusetts, which were expanded in 2004, and 11 of the 26 other facilities in which its branch offices are located. The remaining offices are occupied under leases expiring on various dates from 2015 to 2026. The Company believes that its banking offices are in good condition.

During December 2013, the Company entered into a lease agreement to open a branch located in Woburn, Massachusetts. The branch opened on November 3, 2014.

During March 2014, the Company entered into a lease agreement to open a branch located on Boylston Street in Boston, Massachusetts. This property is leased from an entity affiliated with Marshall M. Sloane, Chairman of the Board of the Company. This agreement was approved by the Board of Directors in the absence of the Chairman of the Board. The branch opened on April 22, 2015. The deposits from the Kenmore Square, Boston, Massachusetts branch, which closed on September 30, 2014, were moved to the new Boylston Street branch. The Kenmore Square branch landlord did not renew the existing lease during 2014.

During June 2016, the Company entered into a lease agreement to open a new branch located in Wellesley, Massachusetts. The Company closed its existing Wellesley branch and transferred the accounts to the new branch. The new branch opened on December 19, 2016.

ITEM 3.     LEGAL PROCEEDINGS

The Company and its subsidiaries are parties to various claims and lawsuits arising in the course of their normal business activities. Although the ultimate outcome of these suits 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.

ITEM 4.     MINE SAFETY DISCLOSURES

Not applicable.

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PART II

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

(a)  The Class A Common Stock of the Company is traded on the NASDAQ National Global Market under the symbol “CNBKA.” The price range of the Company’s Class A common stock since January 1, 2015 is shown on page 12. The Company’s Class B Common Stock is not traded on any national securities exchange or other public trading market.

The shares of Class A Common Stock are generally not entitled to vote on any matter, including in the election of Company Directors, but, in limited circumstances, may be entitled to vote as a class on certain extraordinary transactions, including any merger or consolidation (other than one in which the Company is the surviving corporation or one which by law may be approved by the directors without any stockholder vote) or the sale, lease, or exchange of all or substantially all of the property and assets of the Company. Since the vote of a majority of the shares of the Company’s Class B Common Stock, voting as a separate class, is required to approve certain extraordinary corporate transactions, the holders of Class B Common Stock have the power to prevent any takeover of the Company not approved by them.

(b)  Approximate number of equity security holders as of December 31, 2016:

Title of Class	Approximate Number of  Record Holders
Class A Common Stock		1,083
Class B Common Stock		47

(c)  Under the Company’s Articles of Organization, the holders of Class A Common Stock are entitled to receive dividends per share equal to at least 200% of dividends paid, if any, from time to time, on each share of Class B Common Stock.

The following table shows the dividends paid by the Company on the Class A and Class B Common Stock for the periods indicated.

	Dividends per Share
	Class A		Class B
2015
First quarter	$	0.12	$	0.06
Second quarter		0.12		0.06
Third quarter		0.12		0.06
Fourth quarter		0.12		0.06
2016
First quarter	$	0.12	$	0.06
Second quarter		0.12		0.06
Third quarter		0.12		0.06
Fourth quarter		0.12		0.06

The Company’s ability to pay dividends on its shares depends generally on dividends it receives from the Bank. Both Massachusetts and federal law limit the payment of dividends by the Bank to the Company. Under FDIC regulations and applicable Massachusetts law, the dollar amount of dividends and any other capital distributions that the Bank may make depends upon its capital position and recent net income. Generally, so long as the Bank remains adequately capitalized, it may potentially make capital distributions during any calendar year equal to up to 100% of net income for the year to date plus retained net income for the two preceding years. However, if the Bank’s capital becomes impaired or the FDIC or Commissioner otherwise determines that the Bank should conserve capital, the Bank may be prohibited or otherwise limited from paying any dividends or making any other capital distributions.

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The Federal Reserve Board also has authority to prohibit dividends by bank holding companies such as the Company, if their actions constitute unsafe or unsound practices. Prior to the recent financial crisis, the Federal Reserve Board issued a policy statement and supervisory guidance on the payment of cash dividends by bank holding companies, which expresses the Federal Reserve Board’s view that a bank holding company should pay cash dividends only to the extent that, (1) the company’s net income for the past year is sufficient to cover the cash dividends, (2) the rate of earnings retention is consistent with the company’s capital needs, asset quality, and overall financial condition, and (3) the minimum regulatory capital adequacy ratios are met. It is also the Federal Reserve Board’s policy that bank holding companies should not maintain dividend levels that undermine their ability to serve as a source of strength to their banking subsidiaries. It is expected that the Federal Reserve Board will be more rather than less restrictive for the foreseeable future about dividend practices.

(d)  The following schedule provides information with respect to the Company’s equity compensation plans under which shares of Class A Common Stock are authorized for issuance as of December 31, 2016:

	Equity Compensation Plan Information
Plan Category	Number of Shares to be Issued Upon Exercise of Outstanding Options (a)		Weighted-Average Exercise Price of Outstanding Options (b)		Number of  Shares Remaining Available for Future Issuance Under Equity Compensation Plans (Excluding Shares Reflected in Column (a)) (c)
Equity compensation plans approved by security holders		—	$	—		233,934
Equity compensation plans not approved by security holders		—		—		—
Total		—	$	—		233,934

(e)  The performance graph information required herein is shown on page 13.

ITEM 6. SELECTED FINANCIAL DATA

The information required herein is shown on pages 11 through 13.

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

The information required herein is shown on pages 14 through 37.

ITEM 7A. QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

The information required herein is shown on pages 35.

ITEM 8. FINANCIAL STATEMENTS AND SUPPLEMENTARY DATA

The information required herein is shown on pages 38 through 88.

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

None.

ITEM 9A. CONTROLS AND PROCEDURES

The Company’s principal executive officer and principal financial officer have evaluated the Company’s disclosure controls and procedures as of December 31, 2016. Based on this evaluation, the principal executive officer and principal financial officer have concluded that the Company’s disclosure controls and procedures are

8

effective. The Company’s disclosure controls and procedures also effectively ensure that information required to be disclosed in the Company’s filings and submissions with the Securities and Exchange Commission under the Securities Exchange Act of 1934 is accumulated and reported to Company management (including the principal executive officer and principal financial officer) and is recorded, processed, summarized and reported within the time periods specified by the Securities and Exchange Commission. In addition, the Company has reviewed its internal control over financial reporting and there have been no changes that occurred during the fourth fiscal quarter that have materially affected, or are reasonably likely to materially affect its internal control over financial reporting or in other factors that could significantly affect its internal control over financial reporting.

On May 14, 2013, the Committee of Sponsoring Organizations of the Treadway Commission (COSO) released an updated version of its Internal Control — Integrated Framework (2013) (2013 Framework). The 2013 Framework’s internal control components (i.e., control environment, risk assessment, control activities, information and communication, and monitoring activities) remain predominantly the same as those in the 1992 Framework. However, the 2013 Framework was expanded to include 17 principles which must be present and functioning in order to have an effective system of internal controls. The Company implemented the 2013 Framework effective December 31, 2014.

Management’s report on internal control over financial reporting is shown on page 91. The audit report of the registered public accounting firm is shown on page 90.

ITEM 9B. OTHER INFORMATION

None.

9

FINANCIAL STATEMENTS

Financial Highlights	11
Management’s Discussion and Analysis of Results of Operations and Financial Condition	14
Consolidated Balance Sheets	38
Consolidated Statements of Income	39
Consolidated Statements of Comprehensive Income	40
Consolidated Statements of Changes in Stockholders’ Equity	41
Consolidated Statements of Cash Flows	42
Notes to Consolidated Financial Statements	43
Reports of Independent Registered Public Accounting Firm	89
Management’s Report on Internal Control Over Financial Reporting	91

10

Financial Highlights

	2016			2015			2014			2013			2012
(dollars in thousands, except share data)
FOR THE YEAR
Interest income	$	96,699		$	90,093		$	85,371		$	79,765		$	81,494
Interest expense		22,617			20,134			19,136			18,805			19,540
Net interest income		74,082			69,959			66,235			60,960			61,954
Provision for loan losses		1,375			200			2,050			2,710			4,150
Net interest income after provision for loan losses		72,707			69,759			64,185			58,250			57,804
Other operating income		16,222			15,993			15,271			18,615			15,865
Operating expenses		64,757			62,198			56,730			55,812			53,238
Income before income taxes		24,172			23,554			22,726			21,053			20,431
Provision for income taxes		(362	)		533			866			1,007			1,392
Net income	$	24,534		$	23,021		$	21,860		$	20,046		$	19,039
Average shares outstanding Class A, basic		3,600,729			3,600,729			3,591,732			3,575,683			3,557,693
Average shares outstanding Class B, basic		1,967,180			1,967,180			1,969,030			1,980,855			1,990,474
Average shares outstanding Class A, diluted		5,567,909			5,567,909			5,562,209			5,557,693			5,549,191
Average shares outstanding Class B, diluted		1,967,180			1,967,180			1,969,030			1,980,855			1,990,474
Total shares outstanding at year-end		5,567,909			5,567,909			5,567,909			5,556,584			5,554,959
Earnings per share:
Basic, Class A	$	5.35		$	5.02		$	4.78		$	4.39		$	4.18
Basic, Class B	$	2.68		$	2.51		$	2.39		$	2.19		$	2.09
Diluted, Class A	$	4.41		$	4.13		$	3.93		$	3.61		$	3.43
Diluted, Class B	$	2.68		$	2.51		$	2.39		$	2.19		$	2.09
Dividend payout ratio — Non-GAAP(1)		9.0	%		9.6	%		10.0	%		10.9	%		11.5	%
AT YEAR-END
Assets	$	4,462,608		$	3,947,441		$	3,624,036		$	3,431,154		$	3,086,209
Loans		1,923,933			1,731,536			1,331,366			1,264,763			1,111,788
Deposits		3,653,218			3,075,060			2,737,591			2,715,839			2,445,073
Stockholders’ equity		240,041			214,544			192,500			176,472			179,990
Book value per share	$	43.11		$	38.53		$	34.57		$	31.76		$	32.40
SELECTED FINANCIAL PERCENTAGES
Return on average assets		0.57	%		0.59	%		0.61	%		0.60	%		0.65	%
Return on average stockholders’ equity		10.80	%		11.26	%		11.57	%		11.58	%		11.06	%
Net interest margin, taxable equivalent		2.12	%		2.18	%		2.22	%		2.21	%		2.51	%
Net (recoveries) charge-offs as a percent of average loans		0.00	%		(0.04	)%		0.05	%		0.08	%		0.15	%
Average stockholders’ equity to average assets		5.29	%		5.25	%		5.27	%		5.22	%		5.85	%
Efficiency ratio — Non-GAAP(1)		62.7	%		64.1	%		62.0	%		63.0	%		62.1	%

11

Financial Highlights — (Continued)

(1) Non-GAAP Financial Measures are reconciled in the following tables:

	2016			2015			2014			2013			2012
Calculation of Efficiency Ratio:
Total Operating Expenses (numerator)	$	64,757		$	62,198		$	56,730		$	55,812		$	53,238
Net Interest Income	$	74,082		$	69,959		$	66,235		$	60,960		$	61,954
Total Other Operating Income		16,222			15,993			15,271			18,615			15,865
Tax Equivalent Adjustment		12,917			11,140			10,033			8,984			7,964
Total Income (denominator)	$	103,221		$	97,092		$	91,539		$	88,559		$	85,783
Efficiency Ratio, Year — Non-GAAP		62.7	%		64.1	%		62.0	%		63.0	%		62.1	%
	2016			2015			2014			2013			2012
Calculation of Dividend Payout Ratio:
Dividends Paid (numerator)	$	2,201		$	2,200		$	2,196		$	2,191		$	2,186
Net Income (denominator)	$	24,534		$	23,021		$	21,860		$	20,046		$	19,039
Dividend Payout Ratio – Non-GAAP		9.0	%		9.6	%		10.0	%		10.9	%		11.5	%

Per Share Data 2016, Quarter Ended	December 31,		September 30,		June 30,		March 31,
Market price range (Class A)
High	$	62.60	$	45.45	$	43.24	$	43.96
Low		44.95		41.41		38.75		38.61
Dividends Class A		0.12		0.12		0.12		0.12
Dividends Class B		0.06		0.06		0.06		0.06
2015, Quarter Ended	December 31,		September 30,		June 30,		March 31,
Market price range (Class A)
High	$	45.09	$	41.87	$	41.44	$	40.50
Low		40.95		38.61		38.37		38.34
Dividends Class A		0.12		0.12		0.12		0.12
Dividends Class B		0.06		0.06		0.06		0.06

The stock performance graph below compares the cumulative total shareholder return of the Company’s Class A Common Stock from December 31, 2011 to December 31, 2016 with the cumulative total return of the NASDAQ Market Index (U.S. Companies) and the NASDAQ Bank Stock Index. The lines in the graph represent monthly index levels derived from compounded daily returns that include all dividends. If the monthly interval, based on the fiscal year-end, was not a trading day, the preceding trading day was used.

12

Financial Highlights — (Continued)

Comparison of Five-Year

Cumulative Total Return*

Value of $100 Invested on December 31, 2011 at:	2012		2013		2014		2015		2016
Century Bancorp, Inc.	$	118.54	$	121.32	$	148.13	$	162.59	$	226.85
NASDAQ Banks		134.74		184.08		205.85		210.40		266.24
NASDAQ U.S.		117.45		164.57		188.84		201.98		219.89

* Assumes that the value of the investment in the Company’s Common Stock and each index was $100 on December 31, 2011 and that all dividends were reinvested.

13

Management’s Discussion and Analysis of Results of Operations and Financial Condition

FORWARD-LOOKING STATEMENTS

Certain statements contained herein are not based on historical facts and are “forward-looking statements” within the meaning of Section 21A of the Securities Exchange Act of 1934. Forward-looking statements, which are based on various assumptions (some of which are beyond the Company’s control), may be identified by reference to a future period or periods, or by the use of forward-looking terminology, such as “may,” “will,” “believe,” “expect,” “estimate,” “anticipate,” “continue” or similar terms or variations on those terms, or the negative of these terms. Actual results could differ materially from those set forth in forward-looking statements due to a variety of factors, including, but not limited to, those related to the economic environment, particularly in the market areas in which the Company operates, competitive products and pricing, fiscal and monetary policies of the U.S. Government, changes in government regulations affecting financial institutions, including regulatory fees and capital requirements, changes in prevailing interest rates, acquisitions and the integration of acquired businesses, credit risk management, asset/liability management, the financial and securities markets, and the availability of and costs associated with sources of liquidity.

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.

RECENT MARKET DEVELOPMENTS

The financial services industry continues to face challenges in the aftermath of the recent national and global economic crisis. Since June 2009, the U.S. economy has been recovering from the most severe recession and financial crisis since the Great Depression. There have been improvements in private sector employment, industrial production and U.S. exports; nevertheless, the pace of economic recovery has been slow. Financial markets have improved since the depths of the crisis but are still unsettled and volatile. There is continued concern about the U.S. economic outlook.

On July 21, 2010, the Dodd-Frank Wall Street Reform and Consumer Protection Act (the “Act”) became law. The Act was intended to address many issues arising in the recent financial crisis and is exceedingly broad in scope, affecting many aspects of bank and financial market regulation. The Act requires, or permits by implementing regulation, enhanced prudential standards for banks and bank holding companies inclusive of capital, leverage, liquidity, concentration and exposure measures. In addition, traditional bank regulatory principles such as restrictions on transactions with affiliates and insiders were enhanced. The Act also contains reforms of consumer mortgage lending practices and creates a Bureau of Consumer Financial Protection, which is granted broad authority over consumer financial practices of banks and others. It is expected as the specific new or incremental requirements applicable to the Company become effective that the costs and difficulties of remaining compliant with all such requirements will increase. The Act broadened the base for FDIC assessments to average consolidated assets less tangible equity of financial institutions and also permanently raises the current standard maximum FDIC deposit insurance amount to $250,000. The Act extended unlimited deposit insurance on non-interest bearing transaction accounts through December 31, 2012. In addition, the Act added a new Section 13 to the Bank Holding Company Act, the so-called “Volcker Rule,” (the “Rule”) which generally restricts certain banking entities such as the Company and its subsidiaries or affiliates, from engaging in proprietary trading activities and owning equity in or sponsoring any private equity or hedge fund. The Rule became effective July 21, 2012. The final implementing regulations for the Rule were issued by various regulatory agencies in December, 2013 and under an extended conformance regulation compliance was required to be achieved by July 21, 2015. The conformance period for investments in and relationships with certain “legacy covered funds” has been extended to July 21, 2017. Under the Rule, the Company may be restricted from engaging in proprietary trading, investing in third party hedge or private equity funds or sponsoring new funds unless it qualifies for an exemption from the rule. The Company has little involvement in prohibited proprietary trading or investment activities in covered funds and the Company does not expect that complying with the requirements of the Rule will have any material effect on the Company’s financial condition or results of operation.

14

Management’s Discussion and Analysis of Results of Operations and Financial Condition — (Continued)

Federal banking regulators have issued risk-based capital guidelines, which assign risk factors to asset categories and off-balance-sheet items. Also, the Basel Committee has issued capital standards entitled “Basel III: A global regulatory framework for more resilient banks and banking systems” (“Basel III”). The Federal Reserve Board has finalized its rule implementing the Basel III regulatory capital framework. The rule that came into effect in January 2015 sets the Basel III minimum regulatory capital requirements for all organizations. It included a new common equity Tier I ratio of 4.5 percent of risk-weighted assets, raised the minimum Tier I capital ratio from 4 percent to 6 percent of risk-weighted assets and would set a new conservation buffer of 2.5 percent of risk-weighted assets. The implementation of the framework did not have a material impact on the Company’s financial condition or results of operations.

OVERVIEW

Century Bancorp, Inc. (together with its bank subsidiary, unless the context otherwise requires, the “Company”) is a Massachusetts state-chartered bank holding company headquartered in Medford, Massachusetts. The Company is a Massachusetts corporation formed in 1972 and has one banking subsidiary (the “Bank”): Century Bank and Trust Company formed in 1969. At December 31, 2016, the Company had total assets of $4.5 billion. Currently, the Company operates 27 banking offices in 20 cities and towns in Massachusetts, ranging from Braintree in the south to Andover in the north. The Bank’s customers consist primarily of small and medium-sized businesses and retail customers in these communities and surrounding areas, as well as local governments and institutions throughout Massachusetts, New Hampshire, Rhode Island, Connecticut and New York.

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. The results of operations are also 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 and the relative levels of interest rates and economic activity.

The Company offers a wide range of services to commercial enterprises, state and local governments and agencies, non-profit organizations and individuals. It emphasizes service to small and medium sized businesses and retail customers in its market area. In recent years, the Company has increased business to larger institutions, specifically, healthcare and higher education. The Company makes commercial loans, real estate and construction loans and consumer loans, and accepts savings, time, and demand deposits. In addition, the Company offers its corporate and institutional customers automated lock box collection services, cash management services and account reconciliation services, and actively promotes the marketing of these services to the municipal market. Also, the Company provides full service securities brokerage services through a program called Investment Services at Century Bank, which is supported by LPL Financial, a third party full-service securities brokerage business.

The Company has municipal cash management client engagements in Massachusetts, New Hampshire and Rhode Island comprised of approximately 250 government entities.

The Company had net income of $24,534,000 for the year ended December 31, 2016, compared with net income of $23,021,000 for the year ended December 31, 2015, and net income of $21,860,000 for the year ended December 31, 2014. Class A diluted earnings per share were $4.41 in 2016, compared to $4.13 in 2015 and $3.93 in 2014.

Earnings per share (EPS) for each class of stock and for each year ended December 31, is as follows:

	2016		2015		2014
Basic EPS – Class A common	$	5.35	$	5.02	$	4.78
Basic EPS – Class B common	$	2.68	$	2.51	$	2.39
Diluted EPS – Class A common	$	4.41	$	4.13	$	3.93
Diluted EPS – Class B common	$	2.68	$	2.51	$	2.39

15

Management’s Discussion and Analysis of Results of Operations and Financial Condition — (Continued)

The trends in the net interest margin are illustrated in the graph below:

Net Interest Margin

The net interest margin declined slightly throughout 2014 and the first quarter of 2015. During the second and third quarter of 2015 the net interest margin increased primarily as a result of an increase in higher yielding assets as well as prepayment penalties collected. The increase in higher yielding assets was primarily the result of increased purchases of securities held-to-maturity. The margin decreased during the fourth quarter of 2015 primarily as a result of lower yielding loan originations. The margin increased during the first quarter of 2016 primarily as a result of an increase in rates on earning assets. The margin decreased during the second, third, and fourth quarters of 2016 primarily as a result of a decrease in rates on earning assets.

While management will continue its efforts to improve the net interest margin, there can be no assurance that certain factors beyond its control, such as the prepayment of loans and changes in market interest rates, will continue to positively impact the net interest margin.

Historical U.S. Treasury Yield Curve

A yield curve is a line that typically plots the interest rates of U.S. Treasury Debt, which have different maturity dates but the same credit quality, at a specific point in time. The three main types of yield curve shapes are normal, inverted and flat. Over the past three years, the U.S. economy has experienced low short-term rates. During 2015 and 2016, short-term rates increased slightly more than longer-term rates resulting in a slight flattening of the yield curve.

During 2016 and 2015, the Company’s earnings were positively impacted primarily by an increase in net interest income. This increase was primarily due to an increase in earning assets. Also contributing to the increase in earnings for 2015 was a decrease in the provision for loan losses. This was primarily the result of changes in the risk profile of the Company’s new loan originations, related methodology enhancements to address these changes, as well as net recoveries being realized during the year. During 2016, 2015 and 2014, the U.S. economy experienced a low short-term rate environment. The lower short-term rates negatively impacted the net interest margin as the rate at which short-term deposits could be invested declined more than the rates offered on those deposits.

16

Management’s Discussion and Analysis of Results of Operations and Financial Condition — (Continued)

Total assets were $4,462,608,000 at December 31, 2016, an increase of 13.1% from total assets of $3,947,441,000 at December 31, 2015.

On December 31, 2016, stockholders’ equity totaled $240,041,000, compared with $214,544,000 on December 31, 2015. Book value per share increased to $43.11 at December 31, 2016, from $38.53 on December 31, 2015.

During December 2013, the Company entered into a lease agreement to open a branch located in Woburn, Massachusetts. The branch opened on November 3, 2014.

During March 2014, the Company entered into a lease agreement to open a branch located on Boylston Street in Boston, Massachusetts. This property is leased from an entity affiliated with Marshall M. Sloane, Chairman of the Board of the Company. This agreement was approved by the Board of Directors in the absence of the Chairman of the Board. The branch opened on April 22, 2015. The deposits from the Kenmore Square, Boston, Massachusetts branch, which closed on September 30, 2014, were moved to the new Boylston Street branch. The Kenmore Square landlord did not renew the existing lease during 2014.

During June 2016, the Company entered into a lease agreement to open a new branch located in Wellesley, Massachusetts. The Company closed its existing Wellesley branch and transferred the accounts to the new Wellesley branch which opened on December 19, 2016.

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 impairment of investment securities, allowance for loan losses and income taxes to be its critical accounting policies. There have been no significant changes in the methods or assumptions used in the investment securities accounting policy that require material estimates and assumptions. There was a methodology enhancement to the allowance for loan losses policy. This enhancement is described below.

Impaired Investment Securities

Management evaluates securities for other-than-temporary impairment (“OTTI”) on a periodic basis. Factors considered in determining whether an impairment is OTTI include: (1) the length of time and the extent to which the fair value has been less than amortized cost, (2) projected future cash flows, (3) the financial condition and near-term prospects of the issuers and (4) the intent and ability of the Company to hold the investment for a period of time sufficient to allow for any anticipated recovery in fair value. The Company records an OTTI loss in an amount equal to the entire difference between the fair value and amortized cost if (1) the Company intends to sell an impaired investment security, (2) it is more likely than not that the Company will be required to sell the investment security before its amortized costs or (3) for debt securities, the present value of expected future cash flows is not sufficient to recover the entire amortized cost basis. If an investment security is determined to be OTTI but the Company does not intend to sell the investment security, only the credit portion of the estimated loss is recognized in earnings, with the non-credit portion of the loss recognized in other comprehensive income.

The Company does not intend to sell any of its debt securities with an unrealized loss, and it is not more likely than not that it will be required to sell the debt securities before the anticipated recovery of their remaining amortized cost, which may be maturity.

Allowance for Loan Losses

Arriving at an appropriate level of allowance for loan losses necessarily involves a high degree of judgment. Management maintains an allowance for loan losses to absorb losses inherent in the loan portfolio. The

17

Management’s Discussion and Analysis of Results of Operations and Financial Condition — (Continued)

allowance is based on assessments of the probable estimated losses inherent in the loan portfolio. Management’s methodology for assessing the appropriateness of the allowance consists of several key elements, which include the specific allowances, if appropriate, for identified problem loans, formula allowance, and possibly an unallocated allowance. Arriving at an appropriate level of allowance for loan losses necessarily involves a high degree of judgment.

Specific allowances for loan losses entail the assignment of allowance amounts to individual loans on the basis of loan impairment. Under this method, loans are selected for evaluation based upon a change in internal risk rating, occurrence of delinquency, loan classification or nonaccrual status. The formula allowances are based on evaluations of homogenous loans to determine the allocation appropriate within each portfolio segment. Formula allowances are based on internal risk ratings or credit ratings from external sources. After considering the above components, an unallocated component may be generated to cover uncertainties that could affect management’s estimate of probable losses. Further information regarding the Company’s methodology for assessing the appropriateness of the allowance is contained within Note 1 of the “Notes to Consolidated Financial Statements”.

During 2015, the Company enhanced its approach to the development of the historical loss factors and qualitative factors used on certain loan portfolios. The enhancement is described within the Allowance for Loan Losses section of “Management’s Discussion and Analysis of Results of Operations and Financial Condition”. During 2016, the Company continued to enhance its methodology to the allowance for loan losses by updating qualitative factors on certain loan portfolios. Management believes that the allowance for loan losses is adequate. In addition, various regulatory agencies, as part of the examination process, periodically review the Company’s allowance for loan losses. Such agencies may require the Company to recognize additions to the allowance based on their judgments about information available to them at the time of their examination.

Income Taxes

Certain areas of accounting for income taxes require management’s judgment, including determining the expected realization of deferred tax assets and the adequacy of liabilities for uncertain tax positions. Judgments are made regarding various tax positions, which are often subjective and involve assumptions about items that are inherently uncertain. If actual factors and conditions differ materially from estimates made by management, the actual realization of the net deferred tax assets or liabilities for uncertain tax positions could vary materially from the amounts previously recorded.

Deferred tax assets arise from items that may be used as a tax deduction or credit in future income tax returns, for which a financial statement tax benefit has already been recognized. The realization of the net deferred tax asset generally depends upon future levels of taxable income and the existence of prior years’ taxable income to which refund claims could be carried back. Valuation allowances are recorded against those deferred tax assets determined not likely to be realized. Deferred tax liabilities represent items that will require a future tax payment. They generally represent tax expense recognized in the Company’s financial statements for which payment has been deferred, or a deduction taken on the Company’s tax return but not yet recognized as an expense in the Company’s financial statements. Deferred tax liabilities are also recognized for certain non-cash items such as goodwill.

FINANCIAL CONDITION

Investment Securities

The Company’s securities portfolio consists of securities available-for-sale (“AFS”) and securities held-to-maturity (“HTM”).

Securities available-for-sale consist of certain U.S. Treasury, U.S. Government Sponsored Enterprises, SBA Backed Securities, and U.S. Government Sponsored Enterprise mortgage-backed securities; state, county and municipal securities; privately issued mortgage-backed securities; other debt securities; and other marketable equities.

18

Management’s Discussion and Analysis of Results of Operations and Financial Condition — (Continued)

These securities are carried at fair value, and unrealized gains and losses, net of applicable income taxes, are recognized as a separate component of stockholders’ equity. The fair value of securities available-for-sale at December 31, 2016 totaled $499,297,000 and included gross unrealized gains of $555,000 and gross unrealized losses of $1,478,000. A year earlier, the fair value of securities available-for-sale was $404,623,000 including gross unrealized gains of $979,000 and gross unrealized losses of $1,333,000. In 2016, the Company recognized gains of $52,000 on the sale of available-for-sale securities. In 2015 and 2014, the Company recognized gains of $289,000 and $450,000, respectively.

Securities classified as held-to-maturity consist of U.S. Government Sponsored Enterprises, SBA Backed Securities, and U.S. Government Sponsored Enterprise mortgage-backed securities. Securities held-to-maturity as of December 31, 2016 are carried at their amortized cost of $1,653,986,000. A year earlier, securities held-to-maturity totaled $1,438,903,000. In 2016 the company recognized gains of $12,000 on the sale of held-to-maturity securities. The sales from securities held-to-maturity relate to certain mortgage-backed securities for which the Company had previously collected a substantial portion of its principal investment. In 2015, the Company recognized gains of $305,000. In 2014 the Company did not recognize any gains on sales of held-to-maturity securities.

During the third quarter of 2013, $987,037,000 of securities available-for-sale with unrealized losses of $25,333,000 were transferred to securities held-to-maturity. This was done in response to rising interest rates and an assessment of liquidity needs.

The following table sets forth the fair value and percentage distribution of securities available-for-sale at the dates indicated.

Fair Value of Securities Available-for-Sale

	2016					2015					2014
At December 31,	Amount		Percent			Amount		Percent			Amount		Percent
(dollars in thousands)
U.S. Treasury	$	2,000		0.4	%	$	1,989		0.5	%	$	2,000		0.4	%
U.S. Government Sponsored Enterprises		24,952		5.0	%		—		0.0	%		—		0.0	%
SBA Backed Securities		57,767		11.6	%		5,989		1.5	%		6,717		1.5	%
U.S. Government Agency and Sponsored Enterprises Mortgage-Backed Securities		243,325		48.7	%		233,526		57.7	%		337,093		75.2	%
Privately Issued Residential Mortgage-Backed Securities		1,109		0.2	%		1,434		0.4	%		1,874		0.4	%
Obligations Issued by States and Political Subdivisions		164,876		33.0	%		156,960		38.8	%		96,784		21.6	%
Other Debt Securities		4,924		1.0	%		4,473		1.1	%		3,524		0.8	%
Equity Securities		344		0.1	%		252		0.1	%		398		0.1	%
Total	$	499,297		100.0	%	$	404,623		100.0	%	$	448,390		100.0	%

The majority of the Company’s securities AFS are classified as Level 2, as defined in Note 1 of the “Notes to Consolidated Financial Statements.” The fair values of these securities are obtained from a pricing service, which provides the Company with a description of the inputs generally utilized for each type of security. These inputs include benchmark yields, reported trades, broker/dealer quotes, issuer spreads, two-sided markets, benchmark securities, bids, offers and reference data. Management’s understanding of a pricing service’s pricing methodologies includes obtaining an understanding of the valuation risks, assessing its qualification, verification of sources of information and processes used to develop prices and identifying, documenting, and testing controls. Management’s validation of a vendor’s pricing methodology includes establishing internal controls to

19

Management’s Discussion and Analysis of Results of Operations and Financial Condition — (Continued)

determine that the pricing information received by a pricing service and used by management in the valuation process is relevant and reliable. Market indicators and industry and economic events are also monitored. The decline in fair value from amortized cost for individual available-for-sale securities that are temporarily impaired is not attributable to changes in credit quality. Because the Company does not intend to sell any of its debt securities and it is not more likely than not that it will be required to sell the debt securities before the anticipated recovery of their remaining amortized cost, the Company does not consider these investments to be other-than-temporarily impaired at December 31, 2016.

Securities available-for-sale totaling $164,876,000, or 3.7% of assets, are classified as Level 3, as defined in Note 1 of the “Notes to Consolidated Financial Statements.” These securities are generally municipal securities with no readily determinable fair value. The Company also utilizes internal pricing analysis on various municipal securities using market rates on comparable securities. The securities are carried at fair value with periodic review of underlying financial statements and credit ratings to assess the appropriateness of these valuations.

Debt securities of Government Sponsored Enterprises refer primarily to debt securities of Fannie Mae and Freddie Mac.

The following table sets forth the amortized cost and percentage distribution of securities held-to-maturity at the dates indicated.

Amortized Cost of Securities Held-to-Maturity

	2016					2015					2014
At December 31,	Amount		Percent			Amount		Percent			Amount		Percent
(dollars in thousands)
U.S. Government Sponsored Enterprises	$	148,326		9.0	%	$	186,734		13.0	%	$	251,617		17.9	%
SBA Backed Securities		46,140		2.8	%		—		—			—		—
U.S. Government Sponsored Enterprise Mortgage-Backed Securities		1,459,520		88.2	%		1,252,169		87.0	%		1,155,175		82.1	%
Total	$	1,653,986		100.0	%	$	1,438,903		100.0	%	$	1,406,792		100.0	%

20

Management’s Discussion and Analysis of Results of Operations and Financial Condition — (Continued)

The following two tables set forth contractual maturities of the Bank’s securities portfolio at December 31, 2016. 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.

Fair Value of Securities Available-for-Sale Amounts Maturing

	Within One Year		% of Total			Weighted Average Yield			One Year to Five Years		% of Total			Weighted Average Yield			Five Years to Ten Years		% of Total			Weighted Average Yield			Over Ten Years		% of Total			Weighted Average Yield
(dollars in thousands)
U.S. Treasury	$	2,000		0.4	%		0.54	%	$	—		0.0	%		0.00	%	$	—		0.0	%		0.00	%	$	—		0.0	%		0.00	%
U.S. Government Sponsored Enterprises		9,999		2.0	%		0.70	%		14,953		3.0	%		0.83	%		—		0.0	%		0.00	%		—		0.0	%		0.00	%
SBA Backed Securities		—		0.0	%		0.00	%		—		0.0	%		0.00	%		18,613		3.7	%		1.21	%		39,154		7.8	%		1.14	%
U.S. Government Agency and Sponsored Enterprise Mortgage-Backed Securities		—		0.0	%		0.00	%		90,157		18.1	%		1.17	%		148,429		29.6	%		1.24	%		4,739		1.0	%		1.38	%
Privately Issued Residential Mortgage-Backed Securities		1,109		0.2	%		1.71	%		—		0.0	%		0.00	%		—		0.0	%		0.00	%		—		0.0	%		0.00	%
Obligations of States and Political Subdivisions		159,355		31.9	%		1.18	%		919		0.2	%		3.57	%		305		0.1	%		4.75	%		4,297		0.9	%		1.80	%
Other Debt Securities		800		0.2	%		1.59	%		753		0.2	%		1.88	%		1,000		0.2	%		6.00	%		1,017		0.2	%		6.00	%
Total	$	173,263		34.7	%		1.15	%	$	106,782		21.5	%		1.15	%	$	168,347		33.6	%		1.28	%	$	49,207		9.9	%		1.32	%

	Non- Maturing		% of Total			Weighted Average Yield			Total		% of Total			Weighted Average Yield
(dollars in thousands)
U.S. Treasury	$	—		0.0	%		0.00	%	$	2,000		0.4	%		0.54	%
U.S. Government Agency Sponsored Enterprises		—		0.0	%		0.00	%		24,952		5.0	%		0.78	%
SBA Backed Securities		—		0.0	%		0.00	%		57,767		11.6	%		1.16	%
U.S. Government Agency and Sponsored Enterprise Mortgage-Backed Securities		—		0.0	%		0.00	%		243,325		48.7	%		1.22	%
Privately Issued Residential Mortgage-Backed Securities		—		0.0	%		0.00	%		1,109		0.2	%		1.71	%
Obligations of States and Political Subdivisions		—		0.0	%		0.00	%		164,876		33.0	%		1.21	%
Other Debt Securities		1,354		0.2	%		3.06	%		4,924		1.0	%		3.85	%
Equity Securities		344		0.1	%		3.24	%		344		0.1	%		6.24	%
Total	$	1,698		0.3	%		3.21	%	$	499,297		100.0	%		1.22	%

21

Management’s Discussion and Analysis of Results of Operations and Financial Condition — (Continued)

Amortized Cost of Securities Held-to-Maturity Amounts Maturing

	Within One Year		% of Total			Weighted Average Yield			One Year to Five Years		% of Total			Weighted Average Yield			Five Years to Ten  Years		% of Total			Weighted Average Yield			Over Ten Years		% of Total			Weighted Average Yield			Total		% of Total			Weighted Average Yield
(dollars in thousands)
U.S. Government Sponsored Enterprises	$	14,926		0.9	%		1.52	%	$	123,405		7.5	%		1.70	%	$	9,995		0.6	%		2.06	%	$	—		0.0	%		0.00	%	$	148,326		9.0	%		1.71	%
SBA Backed Securities		—		0.0	%		0.00	%		7,965		0.5	%		1.57	%		33,169		2.0	%		2.20	%		5,006		0.3	%		2.56	%		46,140		2.8	%		2.13	%
U.S. Government Sponsored Enterprise Mortgage-Backed Securities		7,876		0.5	%		2.80	%		991,308		59.9	%		2.17	%		457,191		27.6	%		2.31	%		3,145		0.2	%		3.02	%		1,459,520		88.2	%		2.22	%
Total	$	22,802		1.4	%		1.96	%	$	1,122,678		67.9	%		2.11	%	$	500,355		30.2	%		2.30	%	$	8,151		0.5	%		2.73	%	$	1,653,986		100.0	%		2.17	%

At December 31, 2016 and 2015, the Bank had no investments in obligations of individual states, counties, municipalities or nongovernment corporate entities which exceeded 10% of stockholders’ equity. In 2016, sales of securities totaling $2,568,000 in gross proceeds resulted in a net realized gain of $64,000. There were no sales of state, county or municipal securities during 2016 and 2015. In 2015, sales of securities totaling $51,551,000 in gross proceeds resulted in net realized gains of $594,000. In 2014, sales of securities totaling $40,285,000 in gross proceeds resulted in net realized gains of $450,000.

Management reviews the investment portfolio for other-than-temporary impairment of individual securities on a regular basis. The results of such analysis are dependent upon general market conditions and specific conditions related to the issuers of our securities.

Loans

The Company’s lending activities are conducted principally in Massachusetts, New Hampshire, Rhode Island, Connecticut and New York. The Company grants single-family and multi-family residential loans, commercial and commercial real estate loans, municipal loans, and a variety of consumer loans. To a lesser extent, the Company grants loans for the construction of residential homes, multi-family properties, commercial real estate properties and land development. Most loans granted by the Company are secured by real estate collateral. The ability and willingness of commercial real estate, commercial, construction, residential and consumer loan borrowers to honor their repayment commitments are generally dependent on the health of the real estate market in the borrowers’ geographic areas and of the general economy.

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

	2016					2015					2014					2013					2012
December 31,	Amount		Percent of Total			Amount		Percent of Total			Amount		Percent of Total			Amount		Percent of Total			Amount		Percent of Total
(dollars in thousands)
Construction and land development	$	14,928		0.8	%	$	27,421		1.6	%	$	22,744		1.7	%	$	33,058		2.6	%	$	38,618		3.5	%
Commercial and industrial		612,503		31.8	%		452,235		26.1	%		149,732		11.2	%		76,675		6.1	%		88,475		8.0	%
Municipal		135,418		7.0	%		85,685		4.9	%		41,850		3.1	%		32,737		2.6	%		1,446		0.1	%
Commercial real estate		696,173		36.2	%		721,506		41.7	%		696,272		52.3	%		696,317		55.0	%		575,019		51.7	%
Residential real estate		241,357		12.5	%		255,346		14.7	%		257,305		19.3	%		286,041		22.6	%		281,857		25.3	%
Consumer		11,013		0.6	%		10,744		0.6	%		10,925		0.8	%		8,824		0.7	%		6,823		0.6	%
Home equity		211,857		11.0	%		178,020		10.3	%		151,275		11.4	%		130,277		10.3	%		118,923		10.7	%
Overdrafts		684		0.1	%		579		0.1	%		1,263		0.2	%		834		0.1	%		627		0.1	%
Total	$	1,923,933		100.0	%	$	1,731,536		100.0	%	$	1,331,366		100.0	%	$	1,264,763		100.0	%	$	1,111,788		100.0	%

22

Management’s Discussion and Analysis of Results of Operations and Financial Condition — (Continued)

At December 31, 2016, 2015, 2014, 2013, and 2012, loans were carried net of discounts of $313,000, $360,000, $407,000, $454,000 and $498,000, respectively. Net deferred loan fees of $641,000, $988,000, $908,000, $174,000, and $369,000 were carried in 2016, 2015, 2014, 2013 and 2012, respectively.

The following table summarizes the remaining maturity distribution of certain components of the Company’s loan portfolio on December 31, 2016. The table excludes loans secured by 1–4 family residential real estate, loans for household and family personal expenditures, and municipal loans. Maturities are presented as if scheduled principal amortization payments are due on the last contractual payment date.

Remaining Maturities of Selected Loans at December 31, 2016

	One Year or  Less		One to Five  Years		Over Five Years		Total
(dollars in thousands)
Construction and land development	$	2,535	$	783	$	11,610	$	14,928
Commercial and industrial		38,330		23,821		550,352		612,503
Commercial real estate		49,815		57,691		588,667		696,173
Total	$	90,680	$	82,295	$	1,150,629	$	1,323,604

The following table indicates the rate variability of the above loans due after one year.

December 31, 2016	One to Five  Years		Over Five Years		Total
(dollars in thousands)
Predetermined interest rates	$	37,516	$	284,820	$	322,336
Floating or adjustable interest rates		44,779		865,809		910,588
Total	$	82,295	$	1,150,629	$	1,232,924

The Company’s commercial and industrial (“C&I”) loan customers represent various small and middle-market established businesses involved in manufacturing, distribution, retailing and services. 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 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.

C&I loan customers also include large healthcare and higher education institutions. During 2015, and 2016, the Company increased its lending activities to these types of organizations. The percentage of these types of organizations to total C&I loans has increased to 81% at December 31, 2016, compared to 76% at December 31, 2015.

Commercial real estate loans are extended to finance various manufacturing, warehouse, light industrial, office, retail and residential properties in the Bank’s market area, which generally includes Massachusetts, New Hampshire, and Rhode Island. Also included are loans to educational institutions, hospitals and other non-profit organizations. Loans are normally extended in amounts up to a maximum of 80% of appraised value and normally for terms between three and thirty years.

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. During recent years, the Bank has emphasized nonresidential-type owner-occupied properties. This complements our C&I emphasis placed on the operating business entities and will continue. The regional economic environment affects the risk of both nonresidential and residential mortgages.

Municipal loans customers include loans to municipalities or related interests, primarily for infrastructure projects. The Company has increased its lending activities to municipalities.

23

Management’s Discussion and Analysis of Results of Operations and Financial Condition — (Continued)

Residential real estate (1–4 family) includes two categories of loans. Included in residential real estate are approximately $28,464,000 of C&I type loans secured by 1–4 family real estate. Primarily, these are small businesses with modest capital or shorter operating histories where the collateral mitigates some risk. This category of loans shares similar risk characteristics with the C&I loans, notwithstanding the collateral position.

The other category of residential real estate loans is mostly 1–4 family residential properties located in the Bank’s market area. General underwriting criteria are largely the same as those used by Fannie Mae. The Bank utilizes mortgage insurance to provide lower down payment products and has provided a “First Time Homebuyer” product to encourage new home ownership. Residential real estate loan volume has increased and remains a core consumer product. The economic environment impacts the risks associated with this category.

Home equity loans are extended as both first and second mortgages on owner-occupied residential properties in the Bank’s market area. Loans are underwritten to a maximum loan to property value of 75%.

Bank officers evaluate the feasibility of construction projects based on independent appraisals of the project, architects’ or engineers’ evaluations of the cost of construction and other relevant data. As of December 31, 2016, the Company was obligated to advance a total of $22,049,000 to complete projects under construction.

The composition of nonperforming assets is as follows:

December 31,	2016			2015			2014			2013			2012
(dollars in thousands)
Total nonperforming loans	$	1,084		$	2,336		$	4,146		$	2,549		$	4,471
Other real estate owned		—			—			—			—			—
Total nonperforming assets	$	1,084		$	2,336		$	4,146		$	2,549		$	4,471
Accruing troubled debt restructured loans	$	3,526		$	2,893		$	3,296		$	5,969		$	3,048
Loans past due 90 and still accruing		—			—			—			—			—
Nonperforming loans as a percent of gross loans		0.06	%		0.13	%		0.31	%		0.20	%		0.40	%
Nonperforming assets as a percent of total assets		0.02	%		0.06	%		0.11	%		0.07	%		0.14	%

The composition of impaired loans at December 31, is as follows:

	2016		2015		2014		2013		2012
Residential real estate, multi-family	$	198	$	916	$	962	$	1,199	$	766
Home equity		—		90		92		94		96
Commercial real estate		3,149		1,678		4,318		4,520		2,281
Construction and land development		94		98		103		608		1,500
Commercial and industrial		389		443		852		1,367		1,282
Total impaired loans	$	3,830	$	3,225	$	6,327	$	7,788	$	5,925

At December 31, 2016, 2015, 2014, 2013, and 2012, impaired loans had specific reserves of $173,000, $250,000, $904,000, $1,019,000, and $1,732,000 respectively.

The Company was servicing mortgage loans sold to others without recourse of approximately $229,730,000, $185,299,000, $143,696,000, $109,301,000, and $26,786,000 at December 31, 2016, 2015, 2014, 2013, and 2012, respectively. The Company had no loans held for sale at December 31, 2016, December 31, 2015, December 31, 2014, December 31, 2013, and $9,378,000 at December 31, 2012.

Servicing assets are recorded at fair value and recognized as separate assets when rights are acquired through sale of loans with servicing rights retained. Mortgage servicing assets (“MSA”) are amortized into

24

Management’s Discussion and Analysis of Results of Operations and Financial Condition — (Continued)

non-interest income in proportion to, and over the period of, the estimated net servicing income. Upon sale, the mortgage servicing asset is established, which represents the then-current estimated fair value based on market prices for comparable mortgage servicing contracts, when available, or alternatively, is based on a valuation model that calculates the present value of estimated future net servicing income. The valuation model incorporates assumptions that market participants would use in estimating future net servicing income, such as the cost to service, the discount rate, an inflation rate, ancillary income, prepayment speeds and default rates and losses. Servicing rights are assessed for impairment based on fair value at each reporting date. MSAs are reported in other assets in the consolidated balance sheets. MSAs totaled $1,629,000 at December 31, 2016, $1,305,000 at December 31, 2015, $941,000 at December 31, 2014, $703,000 for December 31, 2013, and $137,000 for December 31, 2012.

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.

Loans are 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 internal loan review, 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 and monthly by the Board of Directors of the Bank.

Nonaccrual loans decreased during 2016, primarily as a result of a decrease in home equity and residential real estate nonperforming loans. Nonaccrual loans decreased during 2015 primarily due to the sale and partial charge-off of the property securing a large commercial real estate loan subsequent to foreclosure. Nonaccrual loans increased during 2014 primarily as a result of a large commercial real estate loan. Nonaccrual loans decreased during 2013 primarily as a result of a charge-off of a construction loan and a decrease in residential real estate nonperforming loans.

The Company continues to monitor closely $35,583,000 and $11,203,000 at December 31, 2016 and 2015, respectively, of 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 December 31, 2016, although such values may fluctuate with changes in the economy and the real estate market. The increase is primarily attributable to one loan relationship secured by real estate.

25

Management’s Discussion and Analysis of Results of Operations and Financial Condition — (Continued)

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. The following table summarizes the changes in the Company’s allowance for loan losses for the years indicated.

Year Ended December 31,	2016			2015			2014			2013			2012
(dollars in thousands)
Year-end loans outstanding (net of unearned discount and deferred loan fees)	$	1,923,933		$	1,731,536		$	1,331,366		$	1,264,763		$	1,111,788
Average loans outstanding (net of unearned discount and deferred loan fees)	$	1,838,136		$	1,507,546		$	1,307,888		$	1,184,912		$	1,036,296
Balance of allowance for loan losses at the beginning of year	$	23,075		$	22,318		$	20,941		$	19,197		$	16,574
Loans charged-off:
Commercial and industrial		—			—			333			234			1,253
Construction		—			172			500			1,000			—
Commercial real estate		—			298			—			—			—
Residential real estate		27			—			24			—			351
Consumer		362			311			525			579			697
Total loans charged-off		389			781			1,382			1,813			2,301
Recovery of loans previously charged-off:
Commercial and industrial		132			212			201			389			307
Construction		—			780			—			—			—
Real estate		6			91			117			31			45
Consumer		296			255			391			427			422
Total recoveries of loans previously charged-off:		434			1,338			709			847			774
Net loan (recoveries) charge-offs		(45	)		(557	)		673			966			1,527
Provision charged to operating expense		1,375			200			2,050			2,710			4,150
Reclassification to other liabilities		(89	)		—			—			—			—
Balance at end of year	$	24,406		$	23,075		$	22,318		$	20,941		$	19,197
Ratio of net (recoveries) charge-offs during the year to average loans outstanding		0.00	%		(0.04	)%		0.05	%		0.08	%		0.15	%
Ratio of allowance for loan losses to loans outstanding		1.27	%		1.33	%		1.68	%		1.66	%		1.73	%

The amount of the allowance for loan losses results from management’s evaluation of the quality of the loan portfolio considering such factors as loan status, specific reserves on impaired loans, collateral values, financial condition of the borrower, the state of the economy and other relevant information. The pace of the charge-offs

26

Management’s Discussion and Analysis of Results of Operations and Financial Condition — (Continued)

depends on many factors, including the national and regional economy. Cyclical lagging factors may result in charge-offs being higher than historical levels. Charge-offs declined in 2013, 2014, 2015 and 2016 as a result of the overall decrease in the level of nonaccrual loans. The dollar amount of the allowance for loan losses increased primarily as a result of a lower level of charge-off activity combined with changes in the portfolio composition and related methodology enhancements to address these changes.

During 2015, the Company enhanced its approach to the development of the historical loss factors and qualitative factors used on certain loan portfolios. The methodology enhancement was in response to the changes in the risk characteristics of the Company’s new loan originations, as the Company has continued to increase its exposure to larger loan originations to large institutions with strong credit quality. The Company has limited internal loss history experience with these types of loans, and has determined a more appropriate representation of loss expectation is to utilize external historical loss factors based on public credit ratings, as there is a great deal of default and loss data available on these types of loans from the credit rating agencies. As of June 30, 2015, the Company incorporated this information into the development of the historical loss rates for these loan types. The combination of the enhancements made to the allowance methodology to address the changing risk profile of the Company’s new loan originations and the increase in these loan types as a percentage of the overall portfolio, has resulted in a decrease in the ratio of allowance for loan losses to total loans.

In addition, the Company monitors the outlook for the industries in which these institutions operate. Healthcare and higher education are the primary industries. The Company also monitors the volatility of the losses within the historical data.

By combining the credit rating, the industry outlook and the loss volatility, the Company arrives at the quantitative loss factor for each credit grade.

Credit ratings issued by national organizations were utilized as credit quality indicators as presented in the following table at December 31, 2016.

	Commercial and Industrial		Municipal		Commercial Real Estate		Total
(in thousands)
Credit Rating:
Aaa-Aa3	$	334,674	$	66,245	$	6,596	$	407,515
A1-A3		188,777		33,365		129,423		351,565
Baa1-Baa3		—		26,970		127,366		154,336
Ba2		—		3,610		—		3,610
Total	$	523,451	$	130,190	$	263,385	$	917,026

Credit ratings issued by national organizations were utilized as credit quality indicators as presented in the following table at December 31, 2015.

	Commercial and Industrial		Municipal		Commercial Real Estate		Total
(in thousands)
Credit Rating:
Aaa-Aa3	$	234,733	$	63,865	$	7,547	$	306,145
A1-A3		140,419		7,400		130,872		278,691
Baa1-Baa3		—		8,890		167,489		176,379
Ba2		—		4,480		—		4,480
Total	$	375,152	$	84,635	$	305,908	$	765,695

27

Management’s Discussion and Analysis of Results of Operations and Financial Condition — (Continued)

The allowance for loan losses is an estimate of the amount needed for an adequate reserve to absorb losses in the existing loan portfolio. This amount is determined by an evaluation of the loan portfolio, including input from an independent organization engaged to review selected larger loans, a review of loan experience and current economic conditions. Although the allowance is allocated between categories, the entire allowance is available to absorb losses attributable to all loan categories. At December 31 of each year listed below, the allowance is comprised of the following:

	2016					2015					2014					2013					2012
	Amount		Percent of  Loans in Each Category to Total Loans			Amount		Percent of Loans in Each Category to Total Loans			Amount		Percent of Loans in Each Category to Total Loans			Amount		Percent of Loans in Each Category to Total Loans			Amount		Percent of Loans in Each Category to Total Loans
(dollars in thousands)
Construction and land development	$	1,012		0.8	%	$	2,041		1.6	%	$	1,592		1.7	%	$	2,174		2.6	%	$	3,041		3.5	%
Commercial and industrial		6,972		31.8	%		5,899		26.1	%		4,757		11.2	%		2,617		6.1	%		3,118		8.0	%
Municipal		1,612		7.1	%		994		4.9	%		1,488		3.1	%		655		2.6	%		24		0.1	%
Commercial real estate		11,135		36.2	%		10,589		41.7	%		11,199		52.3	%		10,935		55.0	%		9,041		51.7	%
Residential real estate		1,698		12.5	%		1,320		14.7	%		776		19.3	%		2,006		22.6	%		1,994		25.3	%
Consumer and other		582		0.6	%		644		0.7	%		810		1.0	%		432		0.8	%		333		0.7	%
Home equity		1,102		11.0	%		1,077		10.3	%		599		11.4	%		959		10.3	%		886		10.7	%
Unallocated		293					511					1,097					1,163					760
Total	$	24,406		100.0	%	$	23,075		100.0	%	$	22,318		100.0	%	$	20,941		100.0	%	$	19,197		100.0	%

Management believes that the allowance for loan losses is adequate. In addition, various regulatory agencies, as part of the examination process, periodically review the Company’s allowance for loan losses. Such agencies may require the Company to recognize additions to the allowance based on their judgments about information available to them at the time of their examination. The enhancements described above have resulted in a lower level of unallocated allowance for loan losses. Further information regarding the allocation of the allowance is contained within Note 6 of the “Notes to Consolidated Financial Statements.”

Deposits

The Company offers savings accounts, NOW accounts, demand deposits, time deposits and money market accounts. Additionally, the Company offers cash management accounts which provide either automatic transfer of funds above a specified level from the customer’s checking account to a money market account or short-term borrowings. Also, an account reconciliation service is offered whereby the Company provides a report balancing the customer’s checking account.

Interest rates on deposits are set twice per month by the Bank’s rate-setting committee, based on factors including loan demand, maturities and a review of competing interest rates offered. Interest rate policies are reviewed periodically by the Executive Management Committee.

28

Management’s Discussion and Analysis of Results of Operations and Financial Condition — (Continued)

The following table sets forth the average balances of the Bank’s deposits for the periods indicated.

	2016					2015					2014
	Amount		Percent			Amount		Percent			Amount		Percent
(dollars in thousands)
Demand Deposits	$	609,159		17.8	%	$	518,161		17.2	%	$	481,035		16.8	%
Savings and Interest Checking		1,322,714		38.6	%		1,139,449		37.8	%		1,096,303		38.2	%
Money Market		1,041,404		30.4	%		951,197		31.5	%		920,485		32.1	%
Time Certificates of Deposit		452,562		13.2	%		408,711		13.5	%		372,699		12.9	%
Total	$	3,425,839		100.0	%	$	3,017,518		100.0	%	$	2,870,522		100.0	%

Time Deposits of $100,000 or more as of December 31, are as follows:

	2016		2015
(dollars in thousands)
Three months or less	$	84,522	$	106,268
Three months through six months		42,736		86,015
Six months through twelve months		85,476		63,409
Over twelve months		153,243		99,108
Total	$	365,977	$	354,800

Borrowings

The Bank’s borrowings consisted primarily of Federal Home Loan Bank of Boston (“FHLBB”) borrowings collateralized by a blanket pledge agreement on the Bank’s FHLBB stock, certain qualified investment securities, deposits at the FHLBB and residential mortgages held in the Bank’s portfolios. The Bank’s borrowings from the FHLBB totaled $293,000,000, a decrease of $75,000,000 from the prior year. The Bank’s remaining term borrowing capacity at the FHLBB at December 31, 2016, was approximately $239,163,000. In addition, the Bank has a $14,500,000 line of credit with the FHLBB. See Note 12, “Other Borrowed Funds and Subordinated Debentures,” for a schedule, including related interest rates and other information.

Subordinated Debentures

In December 2004, the Company consummated the sale of a Trust Preferred Securities offering, in which it issued $36,083,000 of subordinated debt securities due 2034 to its newly formed unconsolidated subsidiary, Century Bancorp Capital Trust II.

Century Bancorp Capital Trust II then issued 35,000 shares of Cumulative Trust Preferred Securities with a liquidation value of $1,000 per share. These securities paid dividends at an annualized rate of 6.65% for the first ten years and then converted to the three-month LIBOR rate plus 1.87% for the remaining 20 years. The Company is using the proceeds primarily for general business purposes.

Securities Sold Under Agreements to Repurchase

The Bank’s remaining borrowings consist primarily of securities sold under agreements to repurchase. Securities sold under agreements to repurchase totaled $182,280,000, a decrease of $15,570,000 from the prior year. See Note 11, “Securities Sold Under Agreements to Repurchase,” for a schedule, including related interest rates and other information.

29

Management’s Discussion and Analysis of Results of Operations and Financial Condition — (Continued)

RESULTS OF OPERATIONS

Net Interest Income

The Company’s operating results depend primarily on net interest income and fees received for providing services. Net interest income on a fully taxable equivalent basis increased 7.3% in 2016 to $86,999,000, compared with $81,099,000 in 2015. The increase in net interest income for 2016 was mainly due to a 10.3% increase in the average balances of earning assets, combined with a similar increase in deposits. The increase in net interest income for 2015 was mainly due to an 8.3% increase in the average balances of earning assets, combined with a similar increase in deposits. The level of interest rates, the ability of the Company’s earning assets and liabilities to adjust to changes in interest rates and the mix of the Company’s earning assets and liabilities affect net interest income. The net interest margin on a fully taxable equivalent basis decreased to 2.12% in 2016 from 2.18% in 2015 and decreased from 2.22% in 2014. The decrease in the net interest margin, for 2016 and 2015, was primarily the result of a decrease in rates on earning assets. This is primarily as a result of originating larger loans to borrowers with high credit quality, some of which are at variable rates. The Company collected approximately $416,000, $945,000 and $693,000 respectively, of prepayment penalties, which are included in interest income on loans, for 2016, 2015, and 2014, respectively.

Additional information about the net interest margin is contained in the “Overview” section of this report. Also, there can be no assurance that certain factors beyond its control, such as the prepayment of loans and changes in market interest rates, will continue to positively impact the net interest margin. Management believes that the current yield curve environment will continue to present challenges as deposit and borrowing costs may have the potential to increase at a faster rate than corresponding asset categories.

30

Management’s Discussion and Analysis of Results of Operations and Financial Condition — (Continued)

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

	2016									2015									2014
Year Ended December 31,	Average Balance			Interest Income/ Expense(1)			Rate Earned/ Paid(1)			Average Balance			Interest Income/ Expense(1)			Rate Earned/ Paid(1)			Average Balance			Interest Income/ Expense(1)			Rate Earned/ Paid(1)
(dollars in thousands)
ASSETS
Interest-earning assets:
Loans(2)
Taxable	$	866,180		$	34,324			3.96	%	$	783,451		$	32,136			4.10	%	$	757,088		$	32,198			4.25	%
Tax-exempt		971,956			35,943			3.70	%		724,095			30,862			4.26	%		550,800			27,798			5.05	%
Securities available-for-sale:(3)
Taxable		349,023			3,969			1.14	%		334,249			2,558			0.77	%		445,656			2,883			0.65	%
Tax-exempt		149,631			1,465			0.98	%		120,389			853			0.71	%		55,272			428			0.77	%
Securities held-to-maturity:
Taxable		1,533,032			32,679			2.13	%		1,603,530			34,388			2.14	%		1,499,995			31,745			2.12	%
Interest-bearing deposits in other banks		235,339			1,236			0.53	%		157,765			436			0.28	%		129,472			352			0.27	%
Total interest-earning assets		4,105,161			109,616			2.67	%		3,723,479			101,233			2.72	%		3,438,283			95,404			2.77	%
Noninterest-earning assets		210,203									191,700									166,792
Allowance for loan losses		(23,872	)								(22,559	)								(21,876	)
Total assets	$	4,291,492								$	3,892,620								$	3,583,199
LIABILITIES AND STOCKHOLDERS’ EQUITY
Interest-bearing deposits:
NOW accounts	$	904,892		$	2,311			0.26	%	$	794,293		$	1,798			0.23	%	$	762,280		$	1,677			0.22	%
Savings accounts		417,822			1,709			0.41	%		345,156			1,019			0.30	%		334,023			862			0.26	%
Money market accounts		1,041,404			3,542			0.34	%		951,197			3,038			0.32	%		920,485			2,715			0.29	%
Time deposits		452,562			5,706			1.26	%		408,711			4,887			1.20	%		372,699			4,421			1.19	%
Total interest-bearing deposits		2,816,680			13,268			0.47	%		2,499,357			10,742			0.43	%		2,389,487			9,675			0.40	%
Securities sold under agreements to repurchase		222,956			472			0.21	%		245,276			487			0.20	%		216,937			391			0.18	%
Other borrowed funds and subordinated debentures		357,974			8,877			2.48	%		374,108			8,905			2.38	%		271,710			9,070			3.34	%
Total interest-bearing liabilities		3,397,610			22,617			0.67	%		3,118,741			20,134			0.65	%		2,878,134			19,136			0.66	%
Noninterest-bearing liabilities
Demand deposits		609,159									518,161									481,035
Other liabilities		57,602									51,247									35,033
Total liabilities		4,064,371									3,688,149									3,394,202
Stockholders’ equity		227,121									204,471									188,997
Total liabilities and stockholders’ equity	$	4,291,492								$	3,892,620								$	3,583,199
Net interest income on a fully taxable equivalent basis				$	86,999								$	81,099								$	76,268
Less taxable equivalent adjustment					(12,917	)								(11,140	)								(10,033	)
Net interest income				$	74,082								$	69,959								$	66,235
Net interest spread								2.00	%								2.07	%								2.11	%
Net interest margin								2.12	%								2.18	%								2.22	%

(1) On a fully taxable equivalent basis calculated using a federal tax rate of 34%.

(2) Nonaccrual loans are included in average amounts outstanding.

(3) At amortized cost.

31

Management’s Discussion and Analysis of Results of Operations and Financial Condition — (Continued)

The following table summarizes the year-to-year changes in the Company’s net interest income resulting from fluctuations in interest rates and volume changes in earning assets and interest-bearing liabilities. Changes due to rate are computed by multiplying the change in rate by the prior year’s volume. Changes due to volume are computed by multiplying the change in volume by the prior year’s rate. Changes in volume and rate that cannot be separately identified have been allocated in proportion to the relationship of the absolute dollar amounts of each change.

	2016 Compared with 2015									2015 Compared with 2014
	Increase/(Decrease)									Increase/(Decrease)
	Due to Change in									Due to Change in
Year Ended December 31,	Volume			Rate			Total			Volume			Rate			Total
(dollars in thousands)
Interest income:
Loans
Taxable	$	3,306		$	(1,118	)	$	2,188		$	1,101		$	(1,163	)	$	(62	)
Tax-exempt		9,556			(4,475	)		5,081			7,836			(4,772	)		3,064
Securities available-for-sale:
Taxable		118			1,293			1,411			(797	)		472			(325	)
Tax-exempt		238			374			612			464			(39	)		425
Securities held-to-maturity:
Taxable		(1,504	)		(205	)		(1,709	)		2,216			427			2,643
Interest-bearing deposits in other banks		283			517			800			78			6			84
Total interest income		11,997			(3,614	)		8,383			10,898			(5,069	)		5,829
Interest expense:
Deposits:
NOW accounts		267			246			513			72			49			121
Savings accounts		244			446			690			30			127			157
Money market accounts		299			205			504			93			230			323
Time deposits		543			276			819			430			36			466
Total interest-bearing deposits		1,353			1,173			2,526			625			442			1,067
Securities sold under agreements to repurchase		(46	)		31			(15	)		54			42			96
Other borrowed funds and subordinated debentures		(392	)		364			(28	)		2,861			(3,026	)		(165	)
Total interest expense		915			1,568			2,483			3,540			(2,542	)		998
Change in net interest income	$	11,082		$	(5,182	)	$	5,900		$	7,358		$	(2,527	)	$	4,831

Average earning assets were $4,105,161,000 in 2016, an increase of $381,682,000 or 10.3% from the average in 2015, which was 8.3% higher than the average in 2014. Total average securities, including securities available-for-sale and securities held-to-maturity, were $2,031,686,000, a decrease of 1.3% from the average in 2015. The decrease in securities volume was mainly attributable to a decrease in taxable securities. An increase in short term rates resulted in slightly higher securities income, which increased 0.8% to $38,113,000 on a fully tax equivalent basis. Total average loans increased 21.9% to $1,838,136,000 after increasing $199,658,000 in 2015. The primary reason for the increase in loans was due in large part to an increase in tax-exempt lending as well as residential second mortgage lending. The increase in loan volume resulted in higher loan income. Loan

32

Management’s Discussion and Analysis of Results of Operations and Financial Condition — (Continued)

income increased by 11.5% or $7,269,000 to $70,267,000. Total loan income was $59,996,000 in 2014. Prepayment penalties collected were $416,000, $945,000, and $693,000 for 2016, 2015, and 2014, respectively.

The Company’s sources of funds include deposits and borrowed funds. On average, deposits increased 13.5%, or $408,321,000, in 2016 after increasing by 5.1%, or $146,996,000, in 2015. Deposits increased in 2016, primarily as a result of increases in demand deposits, savings, money market, NOW accounts, and time deposits. Deposits increased in 2015, primarily as a result of increases in demand deposits, savings, money market, NOW accounts, and time deposits. Borrowed funds and subordinated debentures decreased by 6.2% in 2016, following an increase of 26.8% in 2015. The majority of the Company’s borrowed funds are borrowings from the FHLBB and retail repurchase agreements. Average borrowings from the FHLBB decreased by approximately $16,134,000, and average retail repurchase agreements decreased by $22,320,000 in 2016. Interest expense totaled $22,617,000 in 2016, an increase of $2,483,000, or 12.3%, from 2015 when interest expense increased 5.2% from 2014. The increase in interest expense, for 2016, is primarily due to increases in the average balances of deposits offset, somewhat by a decrease in borrowed funds. The increase in interest expense, for 2015, is primarily due to increases in the average balances of deposits and borrowed funds.

Provision for Loan Losses

The provision for loan losses was $1,375,000 in 2016, compared with $200,000 in 2015 and $2,050,000 in 2014. These provisions are the result of management’s evaluation of the amounts and credit quality of the loan portfolio considering such factors as loan status, collateral values, financial condition of the borrower, the state of the economy and other relevant information. The provision for loan losses increased during 2016, primarily as a result of an increase in loan balances. The provision for loan losses decreased during 2015, primarily as a result of changes in the portfolio composition, related methodology enhancements to address these changes, as well as net recoveries being realized during the year. During the second quarter of 2015, the Company enhanced its approach to the development of the historical loss factors on certain loans within the portfolio. This was done in response to the changing risk profile of the Company’s new loan originations and related methodology enhancements to address these changes.

The allowance for loan losses was $24,406,000 at December 31, 2016, compared with $23,075,000 at December 31, 2015. Expressed as a percentage of outstanding loans at year-end, the allowance was 1.27% in 2016 and 1.33% in 2015. The allowance for loan losses increased primarily as a result of an increase in loan balances. The ratio of allowance for loan losses as a percentage of outstanding loans at year-end decreased primarily as a result of changes in portfolio composition and lower historical loss rates.

Nonperforming loans, which include all non-accruing loans, totaled $1,084,000 on December 31, 2016, compared with $2,336,000 on December 31, 2015. Nonperforming loans decreased primarily as a result of a decrease in consumer mortgage nonperforming loans.

Other Operating Income

During 2016, the Company continued to experience strong results in its fee-based services, including fees derived from traditional banking activities such as deposit-related services, its automated lockbox collection system and full-service securities brokerage supported by LPL Financial, a full-service securities brokerage business.

Under the lockbox program, which is not tied to extensions of credit by the Company, the Company’s customers arrange for payments of their accounts receivable to be made directly to the Company. The Company records the amounts paid to its customers, deposits the funds to the customer’s account and provides automated records of the transactions to customers. Typical customers for the lockbox service are municipalities that use it to automate tax collections, cable TV companies and other commercial enterprises.

33

Management’s Discussion and Analysis of Results of Operations and Financial Condition — (Continued)

Through a program called Investment Services at Century Bank, the Bank provides full-service securities brokerage services supported by LPL Financial, a full-service securities brokerage business. Registered representatives employed by Century Bank offer limited investment advice, execute transactions and assist customers in financial and retirement planning. LPL Financial provides research to the Bank’s representatives. The Bank receives a share in the commission revenues.

Total other operating income in 2016 was $16,222,000, an increase of $229,000, or 1.4%, compared to 2015. This increase followed an increase of $722,000, or 4.7%, in 2015, compared to 2014. Included in other operating income are net gains on sales of securities of $64,000, $594,000 and $450,000 in 2016, 2015 and 2014, respectively. Also included in other operating income are net gains on sales of mortgage loans of $1,331,000, $1,034,000 and $757,000 in 2016, 2015 and 2014, respectively. Service charge income, which continues to be a major source of other operating income, totaling $7,907,000 in 2016, increased $175,000 compared to 2015. This followed a decrease of $331,000 in 2015 compared to 2014. The increase in fees, in 2016, was mainly attributable to an increase in fees collected from processing activities and debit card fees; this was offset somewhat by a decrease in overdraft fees. The decrease in fees, in 2015, was mainly attributable to a decrease in overdraft fees and fees collected from processing activities; this was offset somewhat by an increase in debit card fees. Lockbox revenues totaled $3,164,000, down $47,000 in 2016 following an increase of $112,000 in 2015. Other income totaled $3,441,000, up $399,000 in 2016 following an increase of $442,000 in 2015. The increase in 2016 was primarily the result of increases in wealth management fees, merchant and charge card sales royalties, and cash surrender values of life insurance policies. The increase in 2015 was primarily the result of increases in merchant and charge card sales royalties.

Operating Expenses

Total operating expenses were $64,757,000 in 2016, compared to $62,198,000 in 2015 and $56,730,000 in 2014.

Salaries and employee benefits expenses increased by $1,452,000 or 3.8% in 2016, after increasing by 10.0% in 2015. The increase in 2016 was mainly attributable to merit increases in salaries, bonus accruals, pension costs and health insurance costs. The increase in 2015 was mainly attributable to increases in staff levels, merit increases in salaries, pension costs and health insurance costs.

Occupancy expense increased by $31,000, or 0.5%, in 2016, following an increase of $613,000, or 11.1%, in 2015. The increase in 2016 was primarily attributable to an increase in rent expense. The increase in 2015 was primarily attributable to an increase in rent expense, depreciation expense and building maintenance associated with branch expansion.

Equipment expense increased by $219,000, or 8.3%, in 2016, following an increase of $297,000, or 12.8%, in 2015. The increase in 2016 was primarily attributable to an increase in depreciation expense. The increase in 2015 was primarily attributable to an increase in depreciation expense associated with branch expansion.

FDIC assessments decreased by $250,000, or 11.6%, in 2016, following an increase of $182,000, or 9.2%, in 2015. FDIC assessments decreased in 2016 mainly as a result of a decrease in the assessment rate. FDIC assessments increased in 2015 mainly as a result of deposit growth.

Other operating expenses increased by $1,107,000 in 2016, which followed an $876,000 increase in 2015. The increase in 2016 was primarily attributable to an increase in marketing expenses, telephone expenses, software maintenance costs, contributions, and postage expenses. The increase in 2015 was primarily attributable to an increase in bank security, software maintenance costs, and legal expenses.

Provision for Income Taxes

Income tax expense was ($362,000) in 2016, $533,000 in 2015, and $866,000 in 2014. The effective tax rate was (1.5%) in 2016, 2.3% in 2015 and 3.8% in 2014. The decrease in the effective tax rate for 2016 and 2015 was mainly attributable to an increase in tax-exempt interest income as a percentage of taxable income. The federal tax rate was 34% in 2016, 2015 and 2014.

34

Management’s Discussion and Analysis of Results of Operations and Financial Condition — (Continued)

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. One measure of the Company’s exposure to differential changes in interest rates between assets and liabilities is an interest rate risk management test.

This test measures the impact on net interest income of an immediate change in interest rates in 100-basis point increments as set forth in the following table:

Change in Interest Rates (in Basis Points)	Percentage Change in Net Interest Income(1)
+400	(9.0)
+300	(6.4)
+200	(4.7)
+100	(2.1)
–100	0.8
–200	(0.4)

(1) The percentage change in this column represents net interest income for 12 months in various rate scenarios versus the net interest income in a stable interest rate environment.

The changes in the table above are within the Company’s policy parameters.

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.

Liquidity and Capital Resources

Liquidity is provided by maintaining an adequate level of liquid assets that includes cash and due from banks, federal funds sold and other temporary investments. Liquid assets totaled $239,334,000 on December 31, 2016, compared with $223,957,000 on December 31, 2015. In each of these two years, deposit and borrowing activity has generally been adequate to support asset activity.

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.

Capital Adequacy

Total stockholders’ equity was $240,041,000 at December 31, 2016, compared with $214,544,000 at December 31, 2015. The Company’s equity increased primarily as a result of earnings and a decrease on other comprehensive loss, net of taxes, offset somewhat by dividends paid. Other comprehensive loss, net of taxes, decreased primarily as a result of a decrease in unrealized losses on securities transferred from available-for-sale to held-to-maturity and amortization of the pension liability. This was offset, somewhat, by an increase in unrealized losses on securities available-for-sale.

35

Management’s Discussion and Analysis of Results of Operations and Financial Condition — (Continued)

Federal banking regulators have issued risk-based capital guidelines, which assign risk factors to asset categories and off-balance-sheet items. The following table reflects capital ratios computed utilizing the recently implemented Basel III regulatory capital framework:

	Minimum Capital Ratios			Bank			Company
Leverage ratios		4.00	%		6.02	%		6.28	%
Common equity tier 1 risk weighted capital ratios		4.50	%		11.25	%		10.41	%
Tier 1 risk weighted capital ratios		6.00	%		11.25	%		11.70	%
Total risk weighted capital ratios		8.00	%		12.27	%		12.72	%

Contractual Obligations, Commitments, and Contingencies

The Company has entered into contractual obligations and commitments. The following tables summarize the Company’s contractual cash obligations and other commitments at December 31, 2016.

Contractual Obligations and Commitments by Maturity (dollars in thousands)

	Payments Due — By Period
CONTRACTUAL OBLIGATIONS	Total		Less Than One Year		One to Three Years		Three to Five Years		After Five Years
FHLBB advances	$	293,000	$	77,500	$	112,500	$	58,000	$	45,000
Subordinated debentures		36,083		—		—		—		36,083
Retirement benefit obligations		40,331		3,488		6,951		7,270		22,622
Lease obligations		12,313		2,408		4,276		3,103		2,526
Customer repurchase agreements		182,280		182,280		—		—		—
Total contractual cash obligations	$	564,007	$	265,676	$	123,727	$	68,373	$	106,231
	Amount of Commitment Expiring — By Period
OTHER COMMITMENTS	Total		Less Than One Year		One to Three Years		Three to Five Years		After Five Years
Lines of credit	$	362,357	$	22,348	$	125,912	$	5,698	$	208,399
Standby and commercial letters of credit		6,796		6,209		320		106		161
Other commitments		88,150		18,091		1,050		2,534		66,475
Total commitments	$	457,303	$	46,648	$	127,282	$	8,338	$	275,035

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.

36

Management’s Discussion and Analysis of Results of Operations and Financial Condition — (Continued)

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. Financial instruments with off-balance-sheet risk at December 31 are as follows:

Contract or Notional Amount	2016		2015
(dollars in thousands)
Financial instruments whose contract amount represents credit risk:
Commitments to originate 1–4 family mortgages	$	13,877	$	5,638
Standby and commercial letters of credit		6,796		4,936
Unused lines of credit		362,357		320,874
Unadvanced portions of construction loans		22,049		11,589
Unadvanced portions of other loans		52,224		41,717

Commitments to originate loans, unadvanced portions of construction loans and unused letters of credit are generally agreements to lend to a customer, provided there is no violation of any condition established in the contract. Commitments generally have fixed expiration dates or other termination clauses and may require payment of a fee. Since many of the commitments are expected to expire without being drawn upon, the total commitment amounts do not necessarily represent future cash requirements. The Company evaluates each customer’s creditworthiness on a case-by-case basis. The amount of collateral obtained, if deemed necessary by the Company upon extension of credit, is based on management’s credit evaluation of the borrower.

Standby letters of credit are conditional commitments issued by the Company to guarantee the performance by a customer to a third party. The credit risk involved in issuing letters of credit is essentially the same as that involved in extending loan facilities to customers. The fair value of standby letters of credit was $44,000 and $51,000 for 2016 and 2015, respectively.

Recent Accounting Developments

See Note 1 to the Notes to Consolidated Financial Statements for details of recent accounting developments and their expected impact on the Company’s financial statements.

37

Consolidated Balance Sheets

December 31,	2016			2015
(dollars in thousands except share data)
ASSETS
Cash and due from banks (Note 2)	$	62,400		$	52,877
Federal funds sold and interest-bearing deposits in other banks		173,751			167,847
Total cash and cash equivalents		236,151			220,724
Short-term investments		3,183			3,233
Securities available-for-sale, amortized cost $500,220 in 2016 and $404,977 in 2015 (Notes 3, 9 and 11)		499,297			404,623
Securities held-to-maturity, fair value $1,635,808 in 2016 and $1,438,960 in 2015 (Notes 4 and 11)		1,653,986			1,438,903
Federal Home Loan Bank of Boston, stock at cost		21,042			28,807
Loans, net (Note 5)		1,923,933			1,731,536
Less: allowance for loan losses (Note 6)		24,406			23,075
Net loans		1,899,527			1,708,461
Bank premises and equipment (Note 7)		23,417			24,106
Accrued interest receivable		9,645			8,002
Other assets (Notes 5, 8 and 16)		116,360			110,582
Total assets	$	4,462,608		$	3,947,441
LIABILITIES AND STOCKHOLDERS’ EQUITY
Demand deposits	$	689,286		$	541,955
Savings and NOW deposits		1,304,394			1,070,585
Money market accounts		1,181,179			989,094
Time deposits (Note 10)		478,359			473,426
Total deposits		3,653,218			3,075,060
Securities sold under agreements to repurchase (Note 11)		182,280			197,850
Other borrowed funds (Note 12)		293,000			368,000
Subordinated debentures (Note 12)		36,083			36,083
Other liabilities		57,986			55,904
Total liabilities		4,222,567			3,732,897
Commitments and contingencies (Notes 7, 18 and 19)
Stockholders’ equity (Note 15):
Preferred Stock – $1.00 par value; 100,000 shares authorized; no shares issued and outstanding		—			—
Common stock, Class A,
$1.00 par value per share; authorized 10,000,000 shares; issued 3,600,729 shares in 2016 and 2015		3,601			3,601
Common stock, Class B,
$1.00 par value per share; authorized 5,000,000 shares; issued 1,967,180 shares in 2016 and 2015		1,967			1,967
Additional paid-in capital		12,292			12,292
Retained earnings		243,565			221,232
		261,425			239,092
Unrealized losses on securities available-for-sale, net of taxes		(567	)		(246	)
Unrealized losses on securities transferred to held-to-maturity, net of taxes		(4,084	)		(6,896	)
Pension liability, net of taxes		(16,733	)		(17,406	)
Total accumulated other comprehensive loss, net of taxes (Notes 3, 13 and 15)		(21,384	)		(24,548	)
Total stockholders’ equity		240,041			214,544
Total liabilities and stockholders’ equity	$	4,462,608		$	3,947,441

See accompanying “Notes to Consolidated Financial Statements.”

38

Consolidated Statements of Income

Year Ended December 31,	2016			2015		2014
(dollars in thousands except share data)
INTEREST INCOME
Loans, taxable	$	34,324		$	32,136	$	32,198
Loans, non-taxable		23,440			19,992		17,910
Securities available-for-sale, taxable		3,003			1,900		2,601
Securities available-for-sale, non-taxable		1,051			583		282
Federal Home Loan Bank of Boston dividends		966			658		283
Securities held-to-maturity		32,679			34,388		31,745
Federal funds sold, interest-bearing deposits in other banks and short-term investments		1,236			436		352
Total interest income		96,699			90,093		85,371
INTEREST EXPENSE
Savings and NOW deposits		4,020			2,817		2,539
Money market accounts		3,542			3,038		2,715
Time deposits		5,706			4,887		4,421
Securities sold under agreements to repurchase		472			487		391
Other borrowed funds and subordinated debentures		8,877			8,905		9,070
Total interest expense		22,617			20,134		19,136
Net interest income		74,082			69,959		66,235
Provision for loan losses (Note 6)		1,375			200		2,050
Net interest income after provision for loan losses		72,707			69,759		64,185
OTHER OPERATING INCOME
Service charges on deposit accounts		7,907			7,732		8,063
Lockbox fees		3,164			3,211		3,099
Brokerage commissions		315			380		302
Net gains on sales of securities		64			594		450
Gains on sales of mortgage loans		1,331			1,034		757
Other income		3,441			3,042		2,600
Total other operating income		16,222			15,993		15,271
OPERATING EXPENSES
Salaries and employee benefits (Note 17)		40,048			38,596		35,096
Occupancy		6,147			6,116		5,503
Equipment		2,845			2,626		2,329
FDIC assessments		1,902			2,152		1,970
Other (Note 20)		13,815			12,708		11,832
Total operating expenses		64,757			62,198		56,730
Income before income taxes		24,172			23,554		22,726
Provision for income taxes (Note 16)		(362	)		533		866
Net income	$	24,534		$	23,021	$	21,860
SHARE DATA (Note 14)
Weighted average number of shares outstanding, basic
Class A		3,600,729			3,600,729		3,591,732
Class B		1,967,180			1,967,180		1,969,030
Weighted average number of shares outstanding, diluted
Class A		5,567,909			5,567,909		5,562,209
Class B		1,967,180			1,967,180		1,969,030
Basic earnings per share
Class A	$	5.35		$	5.02	$	4.78
Class B	$	2.68		$	2.51	$	2.39
Diluted earnings per share
Class A	$	4.41		$	4.13	$	3.93
Class B	$	2.68		$	2.51	$	2.39

See accompanying “Notes to Consolidated Financial Statements.”

39

Consolidated Statements of Comprehensive Income

Year Ended December 31,	2016			2015			2014
(dollars in thousands)
NET INCOME	$	24,534		$	23,021		$	21,860
Other comprehensive income (loss), net of tax:
Unrealized gains (losses) on securities:
Unrealized holding gains (losses) arising during period		(289	)		38			1,401
Less: reclassification adjustment for gains included in net income		(32	)		(361	)		(279	)
Total unrealized gains (losses) on securities		(321	)		(323	)		1,122
Accretion of net unrealized losses transferred during period		2,812			3,583			3,188
Defined benefit pension plans:
Pension liability adjustment:
Net (loss) gain		(297	)		(2,890	)		(8,544	)
Amortization of prior service cost and loss included in net periodic benefit cost		970			853			226
Total pension liability adjustment		673			(2,037	)		(8,318	)
Other comprehensive (loss) income		3,164			1,223			(4,008	)
Comprehensive income (loss)	$	27,698		$	24,244		$	17,852

See accompanying “Notes to Consolidated Financial Statements.”

40

Consolidated Statements of Changes in Stockholders’ Equity

	Class A Common Stock		Class B Common Stock			Additional Paid-in Capital		Retained Earnings			Accumulated Other Comprehensive Loss			Total Stockholders’ Equity
(dollars in thousands except share data)
BALANCE, DECEMBER 31, 2013	$	3,580	$	1,976		$	11,932	$	180,747		$	(21,763	)	$	176,472
Net income		—		—			—		21,860			—			21,860
Other comprehensive income, net of tax:
Unrealized holding gains arising during period, net of $756 in taxes and $450 in realized net gains		—		—			—		—			1,122			1,122
Accretion of net unrealized losses transferred during the period, net of $2,004 in taxes		—		—			—		—			3,188			3,188
Pension liability adjustment, net of $5,532 in taxes		—		—			—		—			(8,318	)		(8,318	)
Conversion of Class B Common Stock to Class A Common Stock, 9,000 shares		9		(9	)		—		—			—			—
Stock options exercised, 11,325 shares		12		—			349		—			—			361
Cashless stock options exercised, 7,700 shares		—		—			11		—			—			11
Cash dividends, Class A Common Stock, $0.48 per share		—		—			—		(1,723	)		—			(1,723	)
Cash dividends, Class B Common Stock, $0.24 per share		—		—			—		(473	)		—			(473	)
BALANCE, DECEMBER 31, 2014	$	3,601	$	1,967		$	12,292	$	200,411		$	(25,771	)	$	192,500
Net income		—		—			—		23,021			—			23,021
Other comprehensive income, net of tax:
Unrealized holding gains arising during period, net of $211 in taxes and $594 in realized net gains		—		—			—		—			(323	)		(323	)
Accretion of net unrealized losses transferred during the period, net of $1,919 in taxes		—		—			—		—			3,583			3,583
Pension liability adjustment, net of $1,357 in taxes		—		—			—		—			(2,037	)		(2,037	)
Cash dividends, Class A Common Stock, $0.48 per share		—		—			—		(1,728	)		—			(1,728	)
Cash dividends, Class B Common Stock, $0.24 per share		—		—			—		(472	)		—			(472	)
BALANCE, DECEMBER 31, 2015	$	3,601	$	1,967		$	12,292	$	221,232		$	(24,548	)	$	214,544
Net income		—		—			—		24,534			—			24,534
Other comprehensive income, net of tax:
Unrealized holding gains arising during period, net of $248 in taxes and $52 in realized net gains		—		—			—		—			(321	)		(321	)
Accretion of net unrealized losses transferred during the period, net of $1,505 in taxes		—		—			—		—			2,812			2,812
Pension liability adjustment, net of $448 in taxes		—		—			—		—			673			673
Cash dividends, Class A Common Stock, $0.48 per share		—		—			—		(1,729	)		—			(1,729	)
Cash dividends, Class B Common Stock, $0.24 per share		—		—			—		(472	)		—			(472	)
BALANCE, DECEMBER 31, 2016	$	3,601	$	1,967		$	12,292	$	243,565		$	(21,384	)	$	240,041

See accompanying “Notes to Consolidated Financial Statements.”

41

Consolidated Statements of Cash Flows

Year Ended December 31,	2016			2015			2014
(dollars in thousands)
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$	24,534		$	23,021		$	21,860
Adjustments to reconcile net income to net cash provided by operating activities:
Gain on sales of portfolio loans		(1,331	)		(1,034	)		(757	)
Gain on sale of fixed assets		—			—			(5	)
Net gains on sales of securities		(64	)		(594	)		(450	)
Provision for loan losses		1,375			200			2,050
Deferred tax benefit		(4,676	)		(3,259	)		(3,613	)
Net depreciation and amortization		3,561			3,296			2,937
(Increase) decrease in accrued interest receivable		(1,643	)		(1,761	)		298
Gain on sales of other real estate owned		—			(57	)		(60	)
Increase in other assets		(2,953	)		(10,862	)		(2,849	)
Increase in other liabilities		3,203			2,103			2,976
Net cash provided by operating activities		22,006			11,053			22,387
CASH FLOWS FROM INVESTING ACTIVITIES:
Proceeds from maturities of short-term investments		3,233			—			4,617
Purchase of short-term investments		(3,183	)		(1,102	)		(2,131	)
Proceeds from redemptions of Federal Home Loan Bank of Boston stock		10,381			891			680
Purchase of Federal Home Loan Bank of Boston stock		(2,616	)		(4,782	)		(7,524	)
Proceeds from calls/maturities of securities available-for-sale		277,657			206,109			153,832
Proceeds from sales of securities available-for-sale		2,376			47,853			40,285
Purchase of securities available-for-sale		(375,608	)		(210,302	)		(176,224	)
Proceeds from calls/maturities of securities held-to-maturity		416,599			414,786			267,486
Proceeds from sales of securities held-to-maturity		192			3,698			—
Purchase of securities held-to-maturity		(627,670	)		(444,969	)		(181,411	)
Proceeds from sales of portfolio loans		74,668			66,600			44,501
Net increase in loans		(265,732	)		(467,048	)		(111,528	)
Proceeds from sales of other real estate owned		—			1,973			615
Proceeds from sales of fixed assets		—			—			5
Capital expenditures		(2,263	)		(2,652	)		(3,104	)
Net cash (used in) provided by investing activities		(491,966	)		(388,945	)		30,099
CASH FLOWS FROM FINANCING ACTIVITIES:
Net increase in time deposit accounts		4,933			90,281			921
Net increase in demand, savings, money market and NOW deposits		573,225			247,188			20,831
Net proceeds from the exercise of stock options		—			—			361
Cash dividends		(2,201	)		(2,200	)		(2,196	)
Net decrease in securities sold under agreements to repurchase		(15,570	)		(14,510	)		(2,080	)
Net (decrease) increase in other borrowed funds		(75,000	)		(27,500	)		140,356
Net cash provided by financing activities		485,387			293,259			158,193
Net increase (decrease) in cash and cash equivalents		15,427			(84,633	)		210,679
Cash and cash equivalents at beginning of year		220,724			305,357			94,678
Cash and cash equivalents at end of year	$	236,151		$	220,724		$	305,357
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION:
Cash paid during the year for:
Interest	$	22,668		$	19,979		$	19,168
Income taxes		3,730			4,300			4,493
Change in unrealized losses on securities available-for-sale, net of taxes	$	(321	)	$	(323	)	$	1,122
Change in unrealized losses on securities transferred to held-to-maturity, net of taxes		2,812			3,583			3,188
Pension liability adjustment, net of taxes		673			(2,037	)		(8,318	)
Transfer of loans to other real estate owned		—			1,916			555

See accompanying “Notes to Consolidated Financial Statements.”

42

Notes to Consolidated Financial Statements

1.    Summary of Significant Accounting Policies

BASIS OF FINANCIAL STATEMENT PRESENTATION

The consolidated financial statements include the accounts of Century Bancorp, Inc. (the “Company”) and its wholly owned subsidiary, Century Bank and Trust Company (the “Bank”). The consolidated financial statements also include the accounts of the Bank’s wholly owned subsidiaries, Century Subsidiary Investments, Inc. (“CSII”), Century Subsidiary Investments, Inc. II (“CSII II”), Century Subsidiary Investments, Inc. III (“CSII III”) and Century Financial Services Inc. (“CFSI”). CSII, CSII II, and CSII III are engaged in buying, selling and holding investment securities. CFSI has the power to engage in financial agency, securities brokerage, and investment and financial advisory services and related securities credit. The Company also owns 100% of Century Bancorp Capital Trust II (“CBCT II”). The entity is an unconsolidated subsidiary of the Company.

All significant intercompany accounts and transactions have been eliminated in consolidation. The Company provides a full range of banking services to individual, business and municipal customers in Massachusetts, New Hampshire, Rhode Island, Connecticut and New York. As a bank holding company, the Company is subject to the regulation and supervision of the Federal Reserve Board. The Bank, a state chartered financial institution, is subject to supervision and regulation by applicable state and federal banking agencies, including the Federal Reserve Board, the Federal Deposit Insurance Corporation (the “FDIC”) and the Commonwealth of Massachusetts Commissioner of Banks. The Bank is also subject to various requirements and restrictions under federal and state law, including requirements to maintain reserves against deposits, restrictions on the types and amounts of loans that may be granted and the interest that may be charged thereon, and limitations on the types of investments that may be made and the types of services that may be offered. Various consumer laws and regulations also affect the operations of the Bank. In addition to the impact of regulation, commercial banks are affected significantly by the actions of the Federal Reserve Board as it attempts to control the money supply and credit availability in order to influence the economy. All aspects of the Company’s business are highly competitive. The Company faces aggressive competition from other lending institutions and from numerous other providers of financial services. The Company has one reportable operating segment.

The financial statements have been prepared in conformity with accounting principles generally accepted in the United States of America and general practices within the banking industry. In preparing the financial statements, management is required to make estimates and assumptions that affect the reported amounts of assets and liabilities as of the date of the balance sheet and revenues and expenses for the period. Actual results could differ from those estimates.

Material estimates that are susceptible to change in the near term relate to the allowance for loan losses. Management believes that the allowance for loan losses is adequate based on a review of factors, including historical charge-off rates with additional allocations based on qualitative risk factors for each category and general economic factors. While management uses available information to recognize loan losses, future additions to the allowance for loan losses may be necessary based on changes in economic conditions. In addition, regulatory agencies periodically review the Company’s allowance for loan losses. Such agencies may require the Company to recognize additions to the allowance for loan losses based on their judgments about information available to them at the time of their examination. Certain reclassifications are made to prior-year amounts whenever necessary to conform with the current-year presentation.

FAIR VALUE MEASUREMENTS

The Company follows FASB ASC 820-10, Fair Value Measurements and Disclosures, which among other things, requires enhanced disclosures about assets and liabilities carried at fair value. ASC 820-10 establishes a hierarchal disclosure framework associated with the level of pricing observability utilized in measuring financial instruments at fair value. The three broad levels of the hierarchy are as follows:

Level I — Quoted prices are available in active markets for identical assets or liabilities as of the reported date. The type of financial instruments included in Level I are highly liquid cash instruments with quoted prices, such as G-7 government, agency securities, listed equities and money market securities, as well as listed derivative instruments.

43

Notes to Consolidated Financial Statements — (Continued)

Level II — Pricing inputs are other than quoted prices in active markets, which are either directly or indirectly observable as of the reported date. The nature of these financial instruments includes cash instruments for which quoted prices are available but traded less frequently, derivative instruments whose fair value has been derived using a model where inputs to the model are directly observable in the market or can be derived principally from or corroborated by observable market data, and instruments that are fair valued using other financial instruments, the parameters of which can be directly observed. Instruments that are generally included in this category are corporate bonds and loans, mortgage whole loans, municipal bonds and over the counter (“OTC”) derivatives.

Level III — These instruments have little to no pricing observability as of the reported date. These financial instruments do not have two-way markets and are measured using management’s best estimate of fair value, where the inputs into the determination of fair value require significant management judgment or estimation. Instruments that are included in this category generally include certain commercial mortgage loans, certain private equity investments, distressed debt, and noninvestment grade residual interests in securitizations as well as certain highly structured OTC derivative contracts.

CASH AND CASH EQUIVALENTS

For purposes of reporting cash flows, cash equivalents include highly liquid assets with an original maturity of three months or less. Highly liquid assets include cash and due from banks, federal funds sold and certificates of deposit.

SHORT-TERM INVESTMENTS

As of December 31, 2016 and 2015, short-term investments include highly liquid certificates of deposit with original maturities of more than 90 days but less than one year.

INVESTMENT SECURITIES

Debt securities that the Company has the positive intent and ability to hold to maturity are classified as held-to-maturity and reported at amortized cost; debt and equity securities that are bought and held principally for the purpose of selling are classified as trading and reported at fair value, with unrealized gains and losses included in earnings; and debt and equity securities not classified as either held-to-maturity or trading are classified as available-for-sale and reported at fair value, with unrealized gains and losses excluded from earnings and reported as a separate component of stockholders’ equity, net of estimated related income taxes. The Company has no securities held for trading.

Premiums and discounts on investment securities are amortized or accreted into income by use of the level-yield method. Gains and losses on the sale of investment securities are recognized on the trade date on a specific identification basis.

Management also considers the Company’s capital adequacy, interest-rate risk, liquidity and business plans in assessing whether it is more likely than not that the Company will sell or be required to sell the investment securities before recovery. If the Company determines that a decline in fair value is OTTI and that it is more likely than not that the Company will not sell or be required to sell the investment security before recovery of its amortized cost, the credit portion of the impairment loss is recognized in the Company’s consolidated statement of income and the noncredit portion is recognized in accumulated other comprehensive income. The credit portion of the OTTI impairment represents the difference between the amortized cost and the present value of the expected future cash flows of the investment security. If the Company determines that a decline in fair value is OTTI and it is more likely than not that it will sell or be required to sell the investment security before recovery of its amortized cost, the entire difference between the amortized cost and the fair value of the security will be recognized in the Company’s consolidated statement of income.

44

Notes to Consolidated Financial Statements — (Continued)

The transfer of a security between categories of investments shall be accounted for at fair value. For a debt security transferred into the held-to-maturity category from the available-for-sale category, the unrealized holding gain or loss at the date of the transfer shall continue to be reported in a separate component of shareholders’ equity but shall be amortized over the remaining life of the security as an adjustment of yield in a manner consistent with the amortization of any premium or discount. The amortization of an unrealized holding gain or loss reported in equity will offset or mitigate the effect on interest income of the amortization of the premium or discount for that held-to-maturity security.

The sale of a security held-to-maturity may occur after a substantial portion (at least 85%) of the principal outstanding at acquisition due either to prepayments on the debt security or to scheduled payments on a debt security payable in equal installments over its term. For variable rate securities, the scheduled payments need not be equal.

FEDERAL HOME LOAN BANK STOCK

The Bank, as a member of the Federal Home Loan Bank of Boston (“FHLBB”), is required to maintain an investment in capital stock of the FHLBB. Based on redemption provisions, the stock has no quoted market value and is carried at cost. At its discretion, the FHLBB may declare dividends on the stock. The Company reviews for impairment based on the ultimate recoverability of the cost basis of the stock. As of December 31, 2016, no impairment has been recognized.

LOANS HELD FOR SALE

Loans originated and intended for sale in the secondary market are carried at the lower of cost or estimated fair value in the aggregate. Net unrealized losses, if any, are recognized through a valuation allowance by charges to income.

LOANS

Interest on loans is recognized based on the daily principal amount outstanding. Accrual of interest is discontinued when loans become ninety days delinquent unless the collateral is sufficient to cover both principal and interest and the loan is in the process of collection. Past-due status is based on contractual terms of the loan. Loans, including impaired loans, on which the accrual of interest has been discontinued, are designated nonaccrual loans. When a loan is placed on nonaccrual, all income that has been accrued but remains unpaid is reversed against current period income, and all amortization of deferred loan costs and fees is discontinued. Nonaccrual loans may be returned to an accrual status when principal and interest payments are not delinquent or the risk characteristics of the loan have improved to the extent that there no longer exists a concern as to the collectibility of principal and interest. Income received on nonaccrual loans is either recorded in income or applied to the principal balance of the loan, depending on management’s evaluation as to the collectibility of principal.

Loan origination fees and related direct loan origination costs are offset, and the resulting net amount is deferred and amortized over the life of the related loans using the level-yield method. Prepayments are not initially considered when amortizing premiums and discounts.

The Bank measures impairment for impaired loans at either the fair value of the loan, the present value of the expected future cash flows discounted at the loan’s effective interest rate or the fair value of the collateral if the loan is collateral dependent. This method applies to all loans, uncollateralized as well as collateralized, except large groups of smaller-balance homogeneous loans such as residential real estate and consumer loans that are collectively evaluated for impairment and loans that are measured at fair value. For collateral dependent loans, the amount of the recorded investment in a loan that exceeds the fair value of the collateral is charged-off against the allowance for loan losses in lieu of an allocation of a specific allowance when such an amount has been identified definitively as uncollectible. Management considers the payment status, net worth and earnings potential of the borrower, and the value and cash flow of the collateral as factors to determine if a loan will be

45

Notes to Consolidated Financial Statements — (Continued)

paid in accordance with its contractual terms. Management does not set any minimum delay of payments as a factor in reviewing for impaired classification. Loans are charged-off when management believes that the collectibility of the loan’s principal is not probable. The specific factors that management considers in making the determination that the collectibility of the loan’s principal is not probable include the delinquency status of the loan, the fair value of the collateral, if secured, and, the financial strength of the borrower and/or guarantors. In addition, criteria for classification of a loan as in-substance foreclosure has been modified so that such classification need be made only when a lender is in possession of the collateral. The Bank measures the impairment of troubled debt restructurings using the pre-modification effective rate of interest.

TRANSFERS OF FINANCIAL ASSETS

Transfers of financial assets, typically residential mortgages and loan participations for the Company, are accounted for as sales when control over the assets has been surrendered. Control over transferred assets is deemed to be surrendered when (1) the assets have been isolated from the Company, (2) the transferee obtains the right (free of conditions that constrain it from taking advantage of that right) to pledge or exchange the transferred assets, and (3) the Company does not maintain effective control over the transferred assets.

ACQUIRED LOANS

In accordance with FASB ASC 310-30, Loans and Debt Securities Acquired with Deteriorated Credit Quality (formerly Statement of Position (“SOP”) No. 03-3, “Accounting for Certain Loans or Debt Securities Acquired in a Transfer”) the Company reviews acquired loans for differences between contractual cash flows and cash flows expected to be collected from the Company’s initial investment in the acquired loans to determine if those differences are attributable, at least in part, to credit quality. If those differences are attributable to credit quality, the loan’s contractually required payments received in excess of the amount of its cash flows expected at acquisition, or nonaccretable discount, is not accreted into income. FASB ASC 310-30 requires that the Company recognize the excess of all cash flows expected at acquisition over the Company’s initial investment in the loan as interest income using the interest method over the term of the loan. This excess is referred to as accretable discount and is recorded as a reduction of the loan balance.

Loans which, at acquisition, do not have evidence of deterioration of credit quality since origination are outside the scope of FASB ASC 310-30. For such loans, the discount, if any, representing the excess of the amount of reasonably estimable and probable discounted future cash collections over the purchase price, is accreted into interest income using the interest method over the term of the loan. Prepayments are not considered in the calculation of accretion income. Additionally, the discount is not accreted on nonperforming loans.

When a loan is paid off, the excess of any cash received over the net investment is recorded as interest income. In addition to the amount of purchase discount that is recognized at that time, income may include interest owed by the borrower prior to the Company’s acquisition of the loan, interest collected if on nonperforming status, prepayment fees and other loan fees. There were no new loans acquired during the year ended December 31, 2016.

NONPERFORMING ASSETS

In addition to nonperforming loans, nonperforming assets include other real estate owned. Other real estate owned is comprised of properties acquired through foreclosure or acceptance of a deed in lieu of foreclosure. Other real estate owned is recorded initially at estimated fair value less costs to sell. When such assets are acquired, the excess of the loan balance over the estimated fair value of the asset is charged to the allowance for loan losses. An allowance for losses on other real estate owned is established by a charge to earnings when, upon periodic evaluation by management, further declines in the estimated fair value of properties have occurred. Such evaluations are based on an analysis of individual properties as well as a general assessment of current real estate market conditions. Holding costs and rental income on properties are included in current operations, while certain costs to improve such properties are capitalized. Gains and losses from the sale of other real estate owned are reflected in earnings when realized.

46

Notes to Consolidated Financial Statements — (Continued)

ALLOWANCE FOR LOAN LOSSES

The allowance for loan losses is based on management’s evaluation of the quality of the loan portfolio and is used to provide for losses resulting from loans that ultimately prove uncollectible. The components of the allowance for loan losses represent estimates based upon Accounting Standards Codification (“ASC”) Topic 450, contingencies, and ASC Topic 310 Receivables. ASC Topic 450 applies to homogenous loan pools such as consumer installment, residential mortgages, consumer lines of credit and commercial loans that are not individually evaluated for impairment under ASC Topic 310. In determining the level of the allowance, periodic evaluations are made of the loan portfolio, which takes into account factors such as the characteristics of the loans, loan status, financial strength of the borrowers, value of collateral securing the loans and other relevant information sufficient to reach an informed judgment. The allowance is increased by provisions charged to income and reduced by loan charge-offs, net of recoveries. Management maintains an allowance for loan losses to absorb losses inherent in the loan portfolio. The allowance is based on assessments of the probable estimated losses inherent in the loan portfolio. Management’s methodology for assessing the appropriateness of the allowance consists of several key elements, which include the specific allowances, if appropriate, for identified problem loans, formula allowance, and possibly an unallocated allowance. Arriving at an appropriate level of allowance for loan losses necessarily involves a high degree of judgment.

While management uses available information in establishing the allowance for loan losses, future adjustments to the allowance may be necessary if economic conditions differ substantially from the assumptions used in making the evaluations. Loans are charged-off in whole or in part when, in management’s opinion, collectibility is not probable. The specific factors that management considers in making the determination that the collectibility of the loan’s principal is not probable include the delinquency status of the loan, the fair value of the collateral and the financial strength of the borrower and/or guarantors.

Under ASC Topic 310, a loan is impaired, based upon current information and in management’s opinion, when it is probable that the loan will not be repaid according to its original contractual terms, including both principal and interest, or if a loan is designated as a TDR. Specific allowances for loan losses entail the assignment of allowance amounts to individual loans on the basis of loan impairment. Under this method, loans are selected for evaluation based upon a change in internal risk rating, occurrence of delinquency, loan classification or nonaccrual status. A specific allowance amount is allocated to an individual loan when such loan has been deemed impaired and when the amount of a probable loss is able to be estimated on the basis of: (a) present value of anticipated future cash flows, (b) the loan’s observable fair market price or (c) fair value of collateral if the loan is collateral dependent. For collateral dependent loans, the amount of the recorded investment in a loan that exceeds the fair value of the collateral is charged-off against the allowance for loan losses in lieu of an allocation of a specific allowance when such an amount has been identified definitively as uncollectible.

In estimating probable loan loss under ASC Topic 450 management considers numerous factors, including historical charge-offs and subsequent recoveries. The formula allowances are based on evaluations of homogenous loans to determine the allocation appropriate within each portfolio segment. Formula allowances are based on internal risk ratings or credit ratings from external sources. Individual loans within the commercial and industrial, commercial real estate and real estate construction loan portfolio segments are assigned internal risk ratings to group them with other loans possessing similar risk characteristics. Changes in risk grades affect the amount of the formula allowance. Risk grades are determined by reviewing current collateral value, financial information, cash flow, payment history and other relevant facts surrounding the particular credit. On these loans, the formula allowances are based on the risk ratings, the historical loss experience, and the loss emergence period. Historical loss data and loss emergence periods are developed based on the Company’s historical experience. For larger loans with available external credit ratings, these ratings are utilized rather than the Company’s risk ratings. The historical loss factor and loss emergence periods for these loans are based on data published by the rating agencies for similar credits as the Company has limited internal historical data. For the residential real estate and consumer loan portfolios, the formula allowances are calculated by applying historical loss experience and the loss emergence period to the outstanding balance in each loan category. Loss factors and loss emergence periods are based on the Company’s historical net loss experience.

47

Notes to Consolidated Financial Statements — (Continued)

Additional allowances are added to portfolio segments based on qualitative factors. Management considers potential factors identified in regulatory guidance. Management has identified certain qualitative factors, which could impact the degree of loss sustained within the portfolio. These include market risk factors and unique portfolio risk factors that are inherent characteristics of the Company’s loan portfolio. Market risk factors may consist of changes to general economic and business conditions, such as unemployment and GDP that may impact the Company’s loan portfolio customer base in terms of ability to repay and that may result in changes in value of underlying collateral. Unique portfolio risk factors may include the outlooks for business segments in which the Company’s borrowers operate and loan size. The potential ranges for qualitative factors are based on historical volatility in losses. The actual amount utilized is based on management’s assessment of current conditions.

After considering the above components, an unallocated component may be generated to cover uncertainties that could affect management’s estimate of probable losses. These uncertainties include the effects of loans in new geographical areas and new industries. The unallocated component of the allowance reflects the margin of imprecision inherent in the underlying assumptions used in the methodologies for estimating allocated and general reserves in the portfolio.

BANK PREMISES AND EQUIPMENT

Bank premises and equipment are stated at cost less accumulated depreciation and amortization. Land is stated at cost. Depreciation is computed using the straight-line method over the estimated useful lives of the assets or the terms of leases, if shorter. It is general practice to charge the cost of maintenance and repairs to operations when incurred; major expenditures for improvements are capitalized and depreciated.

GOODWILL AND IDENTIFIABLE INTANGIBLE ASSETS

Goodwill represents the excess of the cost of an acquisition over the fair value of the net assets acquired. Goodwill is not subject to amortization. Identifiable intangible assets consist of core deposit intangibles and are assets resulting from acquisitions that are being amortized over their estimated useful lives. Goodwill and identifiable intangible assets are included in other assets on the consolidated balance sheets. The Company tests goodwill for impairment on an annual basis, or more often if events or circumstances indicate there may be impairment. Goodwill impairment testing is performed at the segment (or “reporting unit”) level. Currently, the Company’s goodwill is evaluated at the entity level as there is only one reporting unit. Goodwill is assigned to reporting units at the date the goodwill is initially recorded. Once goodwill has been assigned to reporting units, it no longer retains its association with a particular acquisition, and all of the activities within a reporting unit, whether acquired or organically grown, are available to support the value of the goodwill.

Goodwill impairment is evaluated by first assessing qualitative factors (events and circumstances) to determine whether it is more likely than not (meaning a likelihood of more than 50 percent) that the fair value of a reporting unit is less than its carrying amount. If, after considering all relevant events and circumstances, an entity determines it is not more likely than not that the fair value of a reporting unit is less than its carrying amount, then performing the two-step impairment test will be unnecessary.

The first step, in the two-step impairment test, used to identify potential impairment, involves comparing each reporting unit’s fair value to its carrying value including goodwill. If the fair value of a reporting unit exceeds its carrying value, applicable goodwill is considered not to be impaired. If the carrying value exceeds fair value, there is an indication of impairment and the second step is performed to measure the amount of impairment.

SERVICING

The Company services mortgage loans for others. Mortgage servicing assets are recognized as separate assets when rights are acquired through purchase or through sale of financial assets. Fair value is determined using prices for similar assets with similar characteristics, when available, or based upon discounted cash flows

48

Notes to Consolidated Financial Statements — (Continued)

using market-based assumptions. The valuation model incorporates assumptions that market participants would use in estimating future net servicing income, such as the cost to service, the discount rate, an inflation rate, ancillary income, prepayment speeds and default rates and losses. Capitalized servicing rights are reported in other assets and are amortized into loan servicing fee income in proportion to, and over the period of, the estimated future net servicing income of the underlying financial assets. Servicing assets are evaluated for impairment based upon the fair value of the rights as compared to amortized cost. Impairment is determined by stratifying rights by predominant risk characteristics, such as interest rates and terms. Impairment is recognized through a valuation allowance for an individual stratum, to the extent that fair value is less than the capitalized amount for the stratum. Changes in the valuation allowance are reported in loan servicing fee income.

STOCK OPTION ACCOUNTING

The Company follows the fair value recognition provisions of FASB ASC 718, Compensation — Stock Compensation for all share-based payments. The Company’s method of valuation for share-based awards granted utilizes the Black-Scholes option-pricing model. The Company will recognize compensation expense for its awards on a straight-line basis over the requisite service period for the entire award (straight-line attribution method), ensuring that the amount of compensation cost recognized at any date at least equals the portion of the grant-date fair value of the award that is vested at that time.

During 2000 and 2004, common stockholders of the Company approved stock option plans (the “Option Plans”) that provide for granting of options to purchase up to 150,000 shares of Class A common stock per plan. Under the Option Plans, all officers and key employees of the Company are eligible to receive nonqualified or incentive stock options to purchase shares of Class A common stock. The Option Plans are administered by the Compensation Committee of the Board of Directors, whose members are ineligible to participate in the Option Plans. Based on management’s recommendations, the Committee submits its recommendations to the Board of Directors as to persons to whom options are to be granted, the number of shares granted to each, the option price (which may not be less than 85% of the fair market value for nonqualified stock options, or the fair market value for incentive stock options, of the shares on the date of grant) and the time period over which the options are exercisable (not more than ten years from the date of grant). There were no options to purchase shares of Class A common stock outstanding at December 31, 2016.

The Company uses the fair value method to account for stock options. There were no options granted during 2016 and 2015.

INCOME TAXES

The Company uses the asset and liability method in accounting for income taxes. Under the asset and liability method, deferred tax assets and liabilities are recognized for the future tax consequences attributable to differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax bases. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which temporary differences are expected to be recovered or settled. Under this method, the effect on deferred tax assets and liabilities of a change in tax rates is recognized in income in the period that includes the enactment date.

The Company accounts for uncertain tax positions in accordance with FASB ASC 740.

The Company classifies interest resulting from underpayment of income taxes as income tax expense in the first period the interest would begin accruing according to the provisions of the relevant tax law.

The Company classifies penalties resulting from underpayment of income taxes as income tax expense in the period for which the Company claims or expects to claim an uncertain tax position or in the period in which the Company’s judgment changes regarding an uncertain tax position.

49

Notes to Consolidated Financial Statements — (Continued)

EARNINGS PER SHARE (“EPS”)

Class A and Class B shares participate equally in undistributed earnings. Under the Company’s Articles of Organization, the holders of Class A Common Stock are entitled to receive dividends per share equal to at least 200% of dividends paid, if any, from time to time, on each share of Class B Common Stock.

Diluted EPS includes the dilutive effect of common stock equivalents; basic EPS excludes all common stock equivalents. The only common stock equivalents for the Company are stock options.

The company utilizes the two class method for reporting EPS. The two-class method is an earnings allocation formula that treats Class A and Class B shares as having rights to earnings that otherwise would have been available only to Class A shareholders and Class B shareholders as if converted to Class A shares.

TREASURY STOCK

Effective July 1, 2004, companies incorporated in Massachusetts became subject to Chapter 156D of the Massachusetts Business Corporation Act, provisions of which eliminate the concept of treasury stock and provide that shares reacquired by a company are to be treated as authorized but unissued shares.

PENSION

The Company provides pension benefits to its employees under a noncontributory, defined benefit plan, which is funded on a current basis in compliance with the requirements of the Employee Retirement Income Security Act of 1974 (“ERISA”) and recognizes costs over the estimated employee service period.

The Company also has a Supplemental Executive Insurance/Retirement Plan (“the Supplemental Plan”), which is limited to certain officers and employees of the Company. The Supplemental Plan is accrued on a current basis and recognizes costs over the estimated employee service period.

Executive officers of the Company or its subsidiaries who have at least one year of service may participate in the Supplemental Plan. The Supplemental Plan is voluntary. Individual life insurance policies, which are owned by the Company, are purchased covering the life of each participant.

The Company utilizes a full yield curve approach in the estimation of the service and interest components by applying the specific spot rates along the yield curve used in the determination of the benefit obligation to the underlying projected cash flows.

RECENT ACCOUNTING DEVELOPMENTS

In May 2014, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) No. 2014-09, Revenue from Contracts with Customers (Topic 606). This ASU is intended to create a single source of revenue guidance which is more principles based than current revenue guidance. The guidance affects any entity that either enters into contracts with customers to transfer goods or services, or enters into contracts for the transfer of non-financial assets, unless those contracts are within the scope of other standards. In August 2015, the FASB issued ASU 2015-14, “Revenue from Contracts with Customers (Topic 606): Deferral of the Effective Date” to amend the effective date of ASU 2014-09. The amendments in ASU 2014-09 are effective for annual and interim periods within fiscal years beginning after December 15, 2017. Earlier adoption is permitted only as of annual reporting periods beginning after December 15, 2016, including interim reporting periods within that reporting period. The FASB has since issued additional related ASUs amendments intended to clarify certain aspects and improve understanding of the implementation guidance of Topic 606 but do not change the core principles of the guidance in Topic 606. The effective date and transition requirements for the amendments are the same as the effective date and transition requirements of Topic 606. The Company is currently evaluating the potential impact of the ASU and its amendments on the Company’s financial statements and results of operations.

50

Notes to Consolidated Financial Statements — (Continued)

In January 2016, FASB issued ASU 2016-1, “Financial Instruments-Overall” (Subtopic 825-10) Recognition and Measurement of Financial Assets and Financial Liabilities. This ASU significantly revises an entity’s accounting related to (1) the classification and measurement of investments in equity securities and (2) the presentation of certain fair value changes for financial liabilities measured at fair value. It also amends certain disclosure requirements associated with the fair value of financial instruments. This ASU is effective for fiscal years beginning after December 15, 2017, including interim periods therein. The Company is currently assessing the applicability of this ASU and has not determined the impact, if any, as of December 31, 2016.

In February 2016, the FASB issued ASU 2016-02, Leases. This ASU requires lessees to put most leases on their balance sheet but recognize expenses on their income statements in a manner similar to today’s accounting. This ASU also eliminates today’s real estate-specific provisions for all companies. For lessors, this ASU modifies the classification criteria and the accounting for sales-type and direct financing leases. This ASU is effective for fiscal years beginning after December 15, 2018, including interim periods therein. Early adoption is permitted. The Company is currently assessing the applicability of this ASU and has not determined the impact, if any, as of December 31, 2016.

In March 2016, the FASB issued ASU 2016-07, Investments — Equity Method and Joint Ventures (Topic 323) Simplifying the Transition to the Equity Method of Accounting. This ASU requires that an entity that has an available-for-sale equity security that becomes qualified for the equity method of accounting recognize through earnings the unrealized holding gain or loss in accumulated other comprehensive income at the date the investment becomes qualified for use of the equity method. This ASU is effective for all entities for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2016. The effect of this update is not expected to have a material impact on the Company’s consolidated financial position.

In March 2016, the FASB issued ASU 2016-09, Compensation — Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting. This ASU was issued as part of the FASB Simplification Initiative which intends to reduce the complexity of GAAP while improving usefulness to users. There are eight main items in this ASU that contribute to the simplification of share-based accounting. For public entities, this ASU is effective for the fiscal years beginning after December 15, 2016, including interim periods within those fiscal years. Early adoption is permitted. The effect of this update is not expected to have a material impact on the Company’s consolidated financial position.

In June 2016, the FASB issued ASU 2016-13, Financial Instruments-Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments. This ASU was issued to provide financial statement users with more decision-useful information about the expected credit losses on financial instruments and other commitments to extend credit held by a reporting entity at each reporting date. To achieve this objective, the amendments in this ASU replace the incurred loss impairment methodology in current GAAP with a methodology that reflects expected credit losses and requires consideration of a broader range of reasonable and supportable information to inform credit loss estimates. The amendments in this ASU are effective for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years. The Company is currently assessing this ASU and has not determined the impact, if any, as of December 31, 2016.

In August 2016, the FASB issued ASU 2016-15, Statement of Cash Flows (Topic 326) Classification of Certain Cash Receipts and Cash Payments. Stakeholders indicated that there is diversity in practice in how certain cash receipts and cash payments are presented and classified in the statement of cash flows under Topic 230, Statement of Cash Flows, and other Topics. This ASU addresses eight specific cash flow issues with the objective of reducing the existing diversity in practice. The amendments in this Update are effective for public business entities for fiscal years beginning after December 15, 2017, and interim periods within those fiscal years. The Company is currently assessing the applicability of this ASU and has not determined the impact, if any, as of December 31, 2016.

In October 2016, the FASB issued ASU 2016-16, Income Taxes (Topic 740) Intra-Entity Transfers of Assets Other Than Inventory. This ASU was issued to improve the accounting for income tax consequences of intra-entity transfers of assets other than inventory. For public entities, this ASU is effective for the fiscal years

51

Notes to Consolidated Financial Statements — (Continued)

beginning after December 15, 2017, including interim periods within those fiscal years. Early adoption is permitted. Management is currently assessing the applicability of this ASU and has not determined the impact, if any, as of December 31, 2016.

In October 2016, the FASB issued ASU 2016-17, Consolidation (Topic 810) Interests Held through Related Parties That Are under Common Control. The amendments of this ASU affect reporting entities that are required to evaluate whether they should consolidate a Variable Interest Entity within the Variable Interest Entities Subsections of Subtopic 810-10, Consolidation — Overall, in certain situations involving entities under common control. For public entities, this ASU is effective for the fiscal years beginning after December 15, 2016, including interim periods within those fiscal years. Early adoption is permitted. The effect of this update is not expected to have a material impact on the Company’s consolidated financial position.

In November 2016, the FASB issued ASU 2016-18, Statement of Cash Flows (Topic 230) Restricted Cash. The amendments of this ASU was issued 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. For public entities, this ASU is effective for the fiscal years beginning after December 15, 2017, including interim periods within those fiscal years. Early adoption is permitted. Management is currently assessing the applicability of this ASU and has not determined the impact, if any, as of December 31, 2016.

2.     Cash and Due from Banks

The Company is required to maintain a portion of its cash and due from banks as a reserve balance under the Federal Reserve Act. Such reserve is calculated based upon deposit levels and amounted to $0 at December 31, 2016, and $0 at December 31, 2015.

3.     Securities Available-for-Sale

	December 31, 2016								December 31, 2015
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Value		Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Value
(dollars in thousands)
U.S. Treasury	$	2,000	$	—	$	—	$	2,000	$	1,999	$	—	$	10	$	1,989
U.S. Government Sponsored Enterprises		25,000		—		48		24,952		—		—		—		—
SBA Backed Securities		57,899		14		146		57,767		5,983		8		2		5,989
U.S. Government Agency and Sponsored Enterprises Mortgage-Backed Securities		243,703		293		671		243,325		232,967		859		300		233,526
Privately Issued Residential Mortgage-Backed Securities		1,121		2		14		1,109		1,437		10		13		1,434
Obligations Issued by States and Political Subdivisions		165,281		—		405		164,876		157,838		—		878		156,960
Other Debt Securities		5,100		18		194		4,924		4,600		3		130		4,473
Equity Securities		116		228		—		344		153		99		—		252
Total	$	500,220	$	555	$	1,478	$	499,297	$	404,977	$	979	$	1,333	$	404,623

52

Notes to Consolidated Financial Statements — (Continued)

Included in SBA Backed Securities and U.S. Government Agency and Sponsored Enterprises Mortgage-Backed Securities are securities at fair value pledged to secure public deposits and repurchase agreements amounting to $210,780,000 and $220,482,000 at December 31, 2016 and 2015, respectively. Also included in securities available-for-sale at fair value are securities pledged for borrowing at the Federal Home Loan Bank amounting to $53,396,000 and $20,056,000 at December 31, 2016 and 2015, respectively. The Company realized gains on sales of securities of $52,000, $289,000, and $450,000 from the proceeds of sales of available-for-sale securities of $2,376,000, $47,853,000, and $40,285,000 for the years ended December 31, 2016, 2015, and 2014, respectively.

Debt securities of U.S. Government Agency and Sponsored Enterprises Mortgage-Backed Securities primarily refer to debt securities of Fannie Mae and Freddie Mac.

The following table shows the estimated maturity distribution of the Company’s securities available-for-sale at December 31, 2016.

	Amortized Cost		Fair Value
(dollars in thousands)
Within one year	$	173,276	$	173,263
After one but within five years		107,005		106,782
After five but within ten years		168,698		168,347
More than ten years		49,625		49,207
Nonmaturing		1,616		1,698
Total	$	500,220	$	499,297

The weighted average remaining life of investment securities available-for-sale at December 31, 2016, was 4.4 years. Included in the weighted average remaining life calculation at December 31, 2106, were $15,000,000 of US Government Sponsored Enterprises obligations that are callable at the discretion of the issuer. The contractual maturities, which were used in the table above, of mortgage-backed securities, will differ from the actual maturities due to the ability of the issuers to prepay underlying obligations. Also, $301,253,000 of the securities are floating rate or adjustable rate and reprice prior to maturity.

As of December 31, 2016 and December 31, 2015, management concluded that the unrealized losses of its investment securities are temporary in nature since they are not related to the underlying credit quality of the issuers, and the Company does not intend to sell these debt securities and it is not more likely than not that it will be required to sell these debt securities before the anticipated recovery of its remaining amortized cost. In making its other-than-temporary impairment evaluation, the Company considered the fact that the principal and interest on these securities are from issuers that are investment grade. The change in the unrealized losses on the Obligations Issued by States and Political Subdivisions, Privately Issued Residential Mortgage-Backed Securities and Other Debt Securities was primarily caused by changes in credit spreads and liquidity issues in the marketplace.

The unrealized loss on SBA Backed Securities and U.S. Government Agency and Sponsored Enterprises Mortgage-Backed Securities related primarily to interest rates and not credit quality and because the Company has the ability and intent to hold these investments until recovery of fair value, which may be maturity. The Company does not consider these investments to be other-than-temporarily impaired at December 31, 2016 and December 31, 2015.

In evaluating the underlying credit quality of a security, management considers several factors such as the credit rating of the obligor and the issuer, if applicable. Internal reviews of issuer financial statements are performed as deemed necessary. In the case of privately issued mortgage-backed securities, the performance of the underlying loans is analyzed as deemed necessary to determine the estimated future cash flows of the

53

Notes to Consolidated Financial Statements — (Continued)

securities. Factors considered include the level of subordination, current and estimated future default rates, current and estimated prepayment rates, estimated loss severity rates, geographic concentrations and origination dates of underlying loans. In the case of marketable equity securities, the severity of the unrealized loss, the length of time the unrealized loss has existed, and the issuer’s financial performance are considered.

The following table shows the temporarily impaired securities of the Company’s available-for-sale portfolio at December 31, 2016. This table shows the unrealized market loss of securities that have been in a continuous unrealized loss position for 12 months or less and a continuous loss position for 12 months and longer. There are 49 and 15 securities that are temporarily impaired for less than 12 months and for 12 months or longer, respectively, out of a total of 270 holdings at December 31, 2016.

	December 31, 2016
	Less Than 12 Months				12 Months or Longer				Total
Temporarily Impaired Investments	Fair Value		Unrealized Losses		Fair Value		Unrealized Losses		Fair Value		Unrealized Losses
(dollars in thousands)
U.S. Treasury	$	—	$	—	$	—	$	—	$	—	$	—
U.S. Government Sponsored Enterprises		24,952		48		—		—		24,952		48
SBA Backed Securities		52,346		145		951		1		53,297		146
U.S. Government Agency and Sponsored Enterprise Mortgage-Backed Securities		135,612		485		31,504		186		167,116		671
Privately Issued Residential Mortgage-Backed Securities		—		—		757		14		757		14
Obligations Issued by States and Political Subdivisions		—		—		4,298		405		4,298		405
Other Debt Securities		453		47		1,553		147		2,006		194
Total temporarily impaired securities	$	213,363	$	725	$	39,063	$	753	$	252,426	$	1,478

The following table shows the temporarily impaired securities of the Company’s available-for-sale portfolio at December 31, 2015. This table shows the unrealized market loss of securities that have been in a continuous unrealized loss position for 12 months or less and a continuous loss position for 12 months and longer. There are 14 and 11 securities that are temporarily impaired for less than 12 months and for 12 months or longer, respectively, out of a total of 290 holdings at December 31, 2015.

	December 31, 2015
	Less Than 12 Months				12 Months or Longer				Total
Temporarily Impaired Investments	Fair Value		Unrealized Losses		Fair Value		Unrealized Losses		Fair Value		Unrealized Losses
(dollars in thousands)
U.S. Treasury	$	1,989	$	10	$	—	$	—	$	1,989	$	10
SBA Backed Securities		1,031		2		—		—		1,031		2
U.S. Government Agency and Sponsored Enterprise Mortgage-Backed Securities		26,519		52		49,341		248		75,860		300
Privately Issued Residential Mortgage-Backed Securities		—		—		490		13		490		13
Obligations Issued by States and Political Subdivisions		—		—		3,820		878		3,820		878
Other Debt Securities		497		3		1,373		127		1,870		130
Total temporarily impaired securities	$	30,036	$	67	$	55,024	$	1,266	$	85,060	$	1,333

54

Notes to Consolidated Financial Statements — (Continued)

4.     Investment Securities Held-to-Maturity

	December 31, 2016								December 31, 2015
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Value		Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Value
(dollars in thousands)
U.S. Government Sponsored Enterprises	$	148,326	$	1,066	$	527	$	148,865	$	186,734	$	2,234	$	141	$	188,827
SBA Backed Securities		46,140		—		1,088		45,052		—		—		—		—
U.S. Government Sponsored Enterprises Mortgage-Backed Securities		1,459,520		4,948		22,577		1,441,891		1,252,169		7,547		9,583		1,250,133
Total	$	1,653,986	$	6,014	$	24,192	$	1,635,808	$	1,438,903	$	9,781	$	9,724	$	1,438,960

Included in U.S. Government Sponsored Enterprises and U.S. Government Sponsored Enterprise Mortgage-Backed Securities are securities pledged to secure public deposits and repurchase agreements at fair value amounting to $1,147,207,000 and $1,004,743,000 at December 31, 2016, and 2015, respectively. Also included are securities pledged for borrowing at the Federal Home Loan Bank at fair value amounting to $424,353,000 and $432,965,000 at December 31, 2016, and 2015, respectively. The Company realized gains of sales of securities of $12,000 from the proceeds of sales of held-to-maturity securities of $192,000 for the year ending December 31, 2016. The sales from securities held-to-maturity relate to certain mortgage-backed securities for which the Company had previously collected a substantial portion of its principal investment. The Company realized gains on sales of securities of $305,000 from the proceeds of sales of held-to-maturity securities of $3,698,000 for the year ending December 31, 2015. There were no sales of held-to-maturity securities for the year ending December 31, 2014.

At December 31, 2016 and 2015, all mortgage-backed securities are obligations of U.S. Government Sponsored Enterprises. Government Sponsored Enterprises primarily refer to debt securities of Fannie Mae and Freddie Mac.

The following table shows the maturity distribution of the Company’s securities held-to-maturity at December 31, 2016.

	Amortized Cost		Fair Value
(dollars in thousands)
Within one year	$	22,802	$	22,911
After one but within five years		1,122,678		1,114,481
After five but within ten years		500,355		490,546
More than ten years		8,151		7,870
Total	$	1,653,986	$	1,635,808

The weighted average remaining life of investment securities held-to-maturity at December 31, 2016, was 4.5 years. Included in the weighted average remaining life calculation at December 31, 2016, were $59,745,000 of U.S. Government Sponsored Enterprises obligations that are callable at the discretion of the issuer. The contractual maturities, which were used in the table above, of mortgage-backed securities, will differ from the actual maturities due to the ability of the issuers to prepay underlying obligations. Also, $188,000 of the securities are floating rate or adjustable rate and reprice prior to maturity.

55

Notes to Consolidated Financial Statements — (Continued)

As of December 31, 2016 and December 31, 2015, management concluded that the unrealized losses of its investment securities are temporary in nature since they are not related to the underlying credit quality of the issuers, and the Company does not intend to sell these debt securities and it is not more likely than not that it will be required to sell these debt securities before the anticipated recovery of their remaining amortized costs. In making its other-than-temporary impairment evaluation, the Company considered the fact that the principal and interest on these securities are from issuers that are investment grade.

The unrealized loss on U.S. Government Sponsored Enterprises and U.S. Government Sponsored Enterprises Mortgage-Backed Securities related primarily to interest rates and not credit quality, and because the Company does not intend to sell any of these securities and it is not more likely than not that it will be required to sell these securities before the anticipated recovery of the remaining amortized cost, the Company does not consider these investments to be other-than-temporarily impaired at December 31, 2016 and December 31, 2015.

In evaluating the underlying credit quality of a security, management considers several factors such as the credit rating of the obligor and the issuer, if applicable. Internal reviews of issuer financial statements are performed as deemed necessary.

The following table shows the temporarily impaired securities of the Company’s held-to-maturity portfolio at December 31, 2016. This table shows the unrealized market loss of securities that have been in a continuous unrealized loss position for 12 months or less and a continuous loss position for 12 months and longer. There are 194 and 16 securities that are temporarily impaired for less than 12 months and for 12 months or longer, respectively, out of a total of 375 holdings at December 31, 2016.

	December 31, 2016
	Less Than 12 Months				12 Months or Longer				Total
Temporarily Impaired Investments	Fair Value		Unrealized Losses		Fair Value		Unrealized Losses		Fair Value		Unrealized Losses
(dollars in thousands)
U.S. Government Sponsored Enterprises	$	59,219	$	527	$	—	$	—	$	59,219	$	527
SBA Backed Securities		45,052		1,088		—		—		45,052		1,088
U.S. Government Agency and Sponsored Enterprise Mortgage-Backed Securities		1,008,960		20,725		58,535		1,852		1,067,495		22,577
Total temporarily impaired securities	$	1,113,231	$	22,340	$	58,535	$	1,852	$	1,171,766	$	24,192

56

Notes to Consolidated Financial Statements — (Continued)

The following table shows the temporarily impaired securities of the Company’s held-to-maturity portfolio at December 31, 2015. This table shows the unrealized market loss of securities that have been in a continuous unrealized loss position for 12 months or less and a continuous loss position for 12 months and longer. There are 101 and 26 securities that are temporarily impaired for less than 12 months and for 12 months or longer, respectively, out of a total of 322 holdings at December 31, 2015.

	December 31, 2015
	Less Than 12 Months				12 Months or Longer				Total
Temporarily Impaired Investments	Fair Value		Unrealized Losses		Fair Value		Unrealized Losses		Fair Value		Unrealized Losses
(dollars in thousands)
U.S. Government Sponsored Enterprises	$	9,859	$	141	$	—	$	—	$	9,859	$	141
U.S. Government Agency and Sponsored Enterprise Mortgage-Backed Securities		626,218		6,657		123,864		2,926		750,082		9,583
Total temporarily impaired securities	$	636,077	$	6,798	$	123,864	$	2,926	$	759,941	$	9,724

5.     Loans

The majority of the Bank’s lending activities are conducted in Massachusetts with other lending activity principally in New Hampshire, Rhode Island, Connecticut and New York. The Bank originates construction, commercial and residential real estate loans, commercial and industrial loans, municipal loans, consumer, home equity and other loans for its portfolio.

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

December 31,	2016		2015
(dollars in thousands)
Construction and land development	$	14,928	$	27,421
Commercial and industrial		612,503		452,235
Municipal		135,418		85,685
Commercial real estate		696,173		721,506
Residential real estate		241,357		255,346
Consumer		11,013		10,744
Home equity		211,857		178,020
Overdrafts		684		579
Total	$	1,923,933	$	1,731,536

At December 31, 2016, and December 31, 2015, loans were carried net of discounts of $313,000 and $360,000, respectively. Net deferred fees included in loans at December 31, 2016, and December 31, 2015, were $641,000 and $988,000, respectively.

The Company was servicing mortgage loans sold to others without recourse of approximately $229,730,000 and $185,299,000 at December 31, 2016, and December 31, 2015, respectively. The Company had no residential real estate loans held for sale at December 31, 2016 and December 31, 2015. The Company’s mortgage servicing rights totaled $1,629,000 and $1,305,000 at December 31, 2016 and December 31, 2015, respectively.

57

Notes to Consolidated Financial Statements — (Continued)

As of December 31, 2016 and 2015, the Company’s recorded investment in impaired loans was $3,830,000 and $3,225,000, respectively. If an impaired loan is placed on nonaccrual, the loan may be returned to an accrual status when principal and interest payments are not delinquent and the risk characteristics have improved to the extent that there no longer exists a concern as to the collectibility of principal and interest. At December 31, 2016, there were $3,105,000 of impaired loans with a specific reserve of $173,000. At December 31, 2015, there were $3,051,000 of impaired loans with specific reserves of $250,000.

Loans are designated as troubled debt restructures when a concession is made on a credit as a result of financial difficulties of the borrower. Typically, such concessions consist of a reduction in interest rate to a below-market rate, taking into account the credit quality of the note, or a deferment of payments, principal or interest, which materially alters the Bank’s position or significantly extends the note’s maturity date, such that the present value of cash flows to be received is materially less than those contractually established at the loan’s origination. Restructured loans are included in the impaired loan category.

The composition of nonaccrual loans and impaired loans is as follows:

December 31,	2016		2015		2014
(dollars in thousands)
Loans on nonaccrual	$	1,084	$	2,336	$	4,146
Loans 90 days past due and still accruing		—		—		—
Impaired loans on nonaccrual included above		304		332		3,031
Total recorded investment in impaired loans		3,830		3,225		6,327
Average recorded investment of impaired loans		3,661		4,490		7,434
Accruing troubled debt restructures		3,526		2,893		3,296
Interest income not recorded on nonaccrual loans according to their original terms		37		91		123
Interest income on nonaccrual loans actually recorded		—		—		—
Interest income recognized on impaired loans		140		104		144

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.

The following table shows the aggregate amount of loans to directors and officers of the Company and their associates during 2016.

Balance at December 31, 2015	Additions		Repayments and Deletions		Balance at December 31, 2016
(dollars in thousands)
$5,010	$	6,778	$	806	$	10,982

6.     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. The following table summarizes the changes in the Company’s allowance for loan losses for the years indicated.

58

Notes to Consolidated Financial Statements — (Continued)

An analysis of the allowance for loan losses for each of the three years ending December 31, 2016, 2015 and 2014 is as follows:

	2016			2015			2014
(dollars in thousands)
Allowance for loan losses, beginning of year	$	23,075		$	22,318		$	20,941
Loans charged-off		(389	)		(781	)		(1,382	)
Recoveries on loans previously charged-off		434			1,338			709
Net recoveries (charge-offs)		45			557			(673	)
Provision charged to expense		1,375			200			2,050
Reclassification to other liabilities*		(89	)		—			—
Allowance for loan losses, end of year	$	24,406		$	23,075		$	22,318

* The reclassification relates to allowance for loan losses allocations on unused commitments that have been reclassified to other liabilities.

Further information pertaining to the allowance for loan losses at December 31, 2016 follows:

	Construction and Land Development			Commercial and Industrial			Municipal		Commercial Real Estate			Residential Real Estate			Consumer			Home Equity			Unallocated			Total
(dollars in thousands)
Allowance for Loan Losses:
Balance at December 31, 2015	$	2,041		$	5,899		$	994	$	10,589		$	1,320		$	644		$	1,077		$	511		$	23,075
Charge-offs		—			—			—		—			—			(362	)		(27	)		—			(389	)
Recoveries		—			132			—		—			6			296			—			—			434
Reclassification to other liabilities		(5	)		(25	)		—		(9	)		(3	)		(3	)		(44	)		—			(89	)
Provision		(1,024	)		966			618		555			375			7			96			(218	)		1,375
Ending balance at December 31, 2016	$	1,012		$	6,972		$	1,612	$	11,135		$	1,698		$	582		$	1,102		$	293		$	24,406
Amount of allowance for loan losses for loans deemed to be impaired	$	3		$	23		$	—	$	140		$	7		$	—		$	—		$	—		$	173
Amount of allowance for loan losses for loans not deemed to be impaired	$	1,009		$	6,949		$	1,612	$	10,995		$	1,691		$	582		$	1,102		$	293		$	24,233
Loans:
Ending balance	$	14,928		$	612,503		$	135,418	$	696,173		$	241,357		$	11,697		$	211,857		$	—		$	1,923,933
Loans deemed to be impaired	$	94		$	389		$	—	$	3,149		$	198		$	—		$	—		$	—		$	3,830
Loans not deemed to be impaired	$	14,834		$	612,114		$	135,418	$	693,024		$	241,159		$	11,697		$	211,857		$	—		$	1,920,103

59

Notes to Consolidated Financial Statements — (Continued)

Further information pertaining to the allowance for loan losses at December 31, 2015 follows:

	Construction and Land Development			Commercial and Industrial			Municipal			Commercial Real Estate			Residential Real Estate		Consumer			Home Equity		Unallocated			Total
(dollars in thousands)
Allowance for Loan Losses:
Balance at December 31, 2014	$	1,592		$	4,757		$	1,488		$	11,199		$	776	$	810		$	599	$	1,097		$	22,318
Charge-offs		—			(172	)		—			(298	)		—		(311	)		—		—			(781	)
Recoveries		780			212			—			84			7		255			—		—			1,338
Provision		(331	)		1,102			(494	)		(396	)		537		(110	)		478		(586	)		200
Ending balance at December 31, 2015	$	2,041		$	5,899		$	994		$	10,589		$	1,320	$	644		$	1,077	$	511		$	23,075
Amount of allowance for loan losses for loans deemed to be impaired	$	10		$	19		$	—		$	99		$	32	$	—		$	90	$	—		$	250
Amount of allowance for loan losses for loans not deemed to be impaired	$	2,031		$	5,880		$	994		$	10,490		$	1,288	$	644		$	987	$	511		$	22,825
Loans:
Ending balance	$	27,421		$	452,235		$	85,685		$	721,506		$	255,346	$	11,323		$	178,020	$	—		$	1,731,536
Loans deemed to be impaired	$	98		$	443		$	—		$	1,678		$	916	$	—		$	90	$	—		$	3,225
Loans not deemed to be impaired	$	27,323		$	451,792		$	85,685		$	719,828		$	254,430	$	11,323		$	177,930	$	—		$	1,728,311

CREDIT QUALITY INFORMATION

The Company utilizes a six-grade internal loan rating system for commercial real estate, construction and commercial loans as follows:

Loans rated 1-3 (Pass) — Loans in this category are considered “pass” rated loans with low to average risk.

Loans rated 4 (Monitor) — These loans represent classified loans that management is closely monitoring for credit quality. These loans have had or may have minor credit quality deterioration as of December 31, 2016.

Loans rated 5 (Substandard) — Substandard loans represent classified loans that management is closely monitoring for credit quality. These loans have had more significant credit quality deterioration as of December 31, 2016.

Loans rated 6 (Doubtful) — Doubtful loans represent classified loans that management is closely monitoring for credit quality. These loans had more significant credit quality deterioration as of December 31, 2016, and are doubtful for full collection.

Impaired — Impaired loans represent classified loans that management is closely monitoring for credit quality. A loan is classified as impaired when it is probable that the Company will be unable to collect all amounts due.

60

Notes to Consolidated Financial Statements — (Continued)

The following table presents the Company’s loans by risk rating at December 31, 2016.

	Construction and Land Development		Commercial and Industrial		Municipal		Commercial Real Estate
(dollars in thousands)
Grade:
1-3 (Pass)	$	14,834	$	612,114	$	135,418	$	661,271
4 (Monitor)		—		—		—		31,753
5 (Substandard)		—		—		—		—
6 (Doubtful)		—		—		—		—
Impaired		94		389		—		3,149
Total	$	14,928	$	612,503	$	135,418	$	696,173

The Company has increased its exposure to larger loans to large institutions with publicly available credit ratings beginning in 2015. These ratings are tracked as a credit quality indicator for these loans.

The following table presents the Company’s loans by credit rating at December 31, 2016.

	Commercial and Industrial		Municipal		Commercial Real Estate		Total
(dollars in thousands)
Credit Rating:
Aaa-Aa3	$	334,674	$	66,245	$	6,596	$	407,515
A1-A3		188,777		33,365		129,423		351,565
Baa1-Baa3		—		26,970		127,366		154,336
Ba2		—		3,610		—		3,610
Total	$	523,451	$	130,190	$	263,385	$	917,026

The following table presents the Company’s loans by risk rating at December 31, 2015.

	Construction and Land Development		Commercial and Industrial		Municipal		Commercial Real Estate
(dollars in thousands)
Grade:
1-3 (Pass)	$	20,281	$	451,774	$	85,685	$	718,911
4 (Monitor)		7,042		18		—		917
5 (Substandard)		—		—		—		—
6 (Doubtful)		—		—		—		—
Impaired		98		443		—		1,678
Total	$	27,421	$	452,235	$	85,685	$	721,506

61

Notes to Consolidated Financial Statements — (Continued)

The following table presents the Company’s loans by credit rating at December 31, 2015.

	Commercial and Industrial		Municipal		Commercial Real Estate		Total
(dollars in thousands)
Credit Rating:
Aaa-Aa3	$	234,733	$	63,865	$	7,547	$	306,145
A1-A3		140,419		7,400		130,872		278,691
Baa1-Baa3		—		8,890		167,489		176,379
Ba2		—		4,480		—		4,480
Total	$	375,152	$	84,635	$	305,908	$	765,695

The Company utilized payment performance as credit quality indicators for residential real estate, consumer and overdrafts, and the home equity portfolio. The indicators are depicted in the table “aging of past-due loans,” below.

AGING OF PAST-DUE LOANS

At December 31, 2016 the aging of past due loans are as follows:

	Accruing 30-89 Days Past Due		Non Accrual		Accruing Greater Than 90 Days		Total Past Due		Current Loans		Total
(dollars in thousands)
Construction and land development	$	—	$	94	$	—	$	94	$	14,834	$	14,928
Commercial and industrial		37		65		—		102		612,401		612,503
Municipal		—		—		—		—		135,418		135,418
Commercial real estate		597		150		—		747		695,426		696,173
Residential real estate		245		656		—		901		240,456		241,357
Consumer and overdrafts		—		11		—		11		11,686		11,697
Home equity		735		108		—		843		211,014		211,857
Total	$	1,614	$	1,084	$	—	$	2,698	$	1,921,235	$	1,923,933

At December 31, 2015 the aging of past due loans are as follows:

	Accruing 30-89 Days Past Due		Non Accrual		Accruing Greater Than 90 Days		Total Past Due		Current Loans		Total
(dollars in thousands)
Construction and land development	$	—	$	99	$	—	$	99	$	27,322	$	27,421
Commercial and industrial		—		60		—		60		452,175		452,235
Municipal		—		—		—		—		85,685		85,685
Commercial real estate		1,462		174		—		1,636		719,870		721,506
Residential real estate		596		1,559		—		2,155		253,191		255,346
Consumer and overdrafts		6		—		—		6		11,317		11,323
Home equity		628		444		—		1,072		176,948		178,020
Total	$	2,692	$	2,336	$	—	$	5,028	$	1,726,508	$	1,731,536

62

Notes to Consolidated Financial Statements — (Continued)

IMPAIRED LOANS

A loan is impaired when, based on current information and events, it is probable that a creditor will be unable to collect all amounts due according to the contractual terms of the loan agreement. When a loan is impaired, the Company measures impairment based on the present value of expected future cash flows discounted at the loan’s effective interest rate, except that as a practical expedient, the Company measures impairment based on a loan’s observable market price or the fair value of the collateral if the loan is collateral dependent. Loans are charged-off when management believes that the collectibility of the loan’s principal is not probable. The specific factors that management considers in making the determination that the collectibility of the loan’s principal is not probable include; the delinquency status of the loan, the fair value of the collateral, if secured, and the financial strength of the borrower and/or guarantors. For collateral dependent loans, the amount of the recorded investment in a loan that exceeds the fair value of the collateral is charged-off against the allowance for loan losses in lieu of an allocation of a specific allowance amount when such an amount has been identified definitively as uncollectible. The Company’s policy for recognizing interest income on impaired loans is contained within Note 1 of the “Notes to Consolidated Financial Statements.”

The following is information pertaining to impaired loans at December 31, 2016:

	Carrying Value		Unpaid Balance Principal		Required Reserve		Average Carrying Value Recognized		Interest Income
(dollars in thousands)
With no required reserve recorded:
Construction and land development	$	—	$	—	$	—	$	—	$	—
Commercial and industrial		45		232		—		53		—
Municipal		—		—		—		—		—
Commercial real estate		590		590		—		375		39
Residential real estate		90		179		—		102		7
Consumer		—		—		—		—		—
Home equity		—		—		—		—		—
Total	$	725	$	1,001	$	—	$	530	$	46
With required reserve recorded:
Construction and land development	$	94	$	108	$	3	$	96	$	—
Commercial and industrial		344		360		23		360		18
Municipal		—		—		—		—		—
Commercial real estate		2,559		2,665		140		2,324		71
Residential real estate		108		108		7		323		5
Consumer		—		—		—		—		—
Home equity		—		—		—		28		—
Total	$	3,105	$	3,241	$	173	$	3,131	$	94
Total
Construction and land development	$	94	$	108	$	3	$	96	$	—
Commercial and industrial		389		592		23		413		18
Municipal		—		—		—		—		—
Commercial real estate		3,149		3,255		140		2,699		110
Residential real estate		198		287		7		425		12
Consumer		—		—		—		—		—
Home equity		—		—		—		28		—
Total	$	3,830	$	4,242	$	173	$	3,661	$	140

63

Notes to Consolidated Financial Statements — (Continued)

The following is information pertaining to impaired loans at December 31, 2015:

	Carrying Value		Unpaid Balance Principal		Required Reserve		Average Carrying Value Recognized		Interest Income
(dollars in thousands)
With no required reserve recorded:
Construction and land development	$	—	$	—	$	—	$	—	$	—
Commercial and industrial		60		246		—		32		—
Municipal		—		—		—		—		—
Commercial real estate		—		—		—		151		—
Residential real estate		114		200		—		125		8
Consumer		—		—		—		—		—
Home equity		—		—		—		—		—
Total	$	174	$	446	$	—	$	308	$	8
With required reserve recorded:
Construction and land development	$	98	$	108	$	10	$	101	$	—
Commercial and industrial		383		399		19		626		20
Municipal		—		—		—		—		—
Commercial real estate		1,678		1,776		99		2,550		69
Residential real estate		802		802		32		814		7
Consumer		—		—		—		—		—
Home equity		90		90		90		91		—
Total	$	3,051	$	3,175	$	250	$	4,182	$	96
Total
Construction and land development	$	98	$	108	$	10	$	101	$	—
Commercial and industrial		443		645		19		658		20
Municipal		—		—		—		—		—
Commercial real estate		1,678		1,776		99		2,701		69
Residential real estate		916		1,002		32		939		15
Consumer		—		—		—		—		—
Home equity		90		90		90		91		—
Total	$	3,225	$	3,621	$	250	$	4,490	$	104

Troubled Debt Restructurings are identified as a modification in which a concession was granted to a customer who was having financial difficulties. This concession may be below market rate, longer amortization/term, or a lower payment amount. The present value calculation of the modification did not result in an increase in the allowance for these loans beyond any previously established allocations.

There was one commercial real estate troubled debt restructuring during the year ended December 31, 2016. The pre-modification and post-modification outstanding recorded investment was $2,091,000. The loan was modified in 2016, by reducing the interest rate as well as extending the term on the loan. The financial impact for the modification was $16,000 reduction in principal payments and $5,000 reduction in interest payments for 2016.

64

Notes to Consolidated Financial Statements — (Continued)

There were no troubled debt restructurings occurring during the year ended December 31, 2015. Also, there were no commitments to lend additional funds to troubled debt restructuring borrowers. There were no troubled debt restructurings that subsequently defaulted during 2015 and 2016.

7.     Bank Premises and Equipment

December 31,	2016			2015			Estimated Useful Life
(dollars in thousands)
Land	$	3,478		$	3,478			—
Bank premises		19,272			19,272			30-39 years
Furniture and equipment		26,271			24,131			3-10 years
Leasehold improvements		12,802			12,892			30-39 years or lease term
		61,823			59,773
Accumulated depreciation and amortization		(38,406	)		(35,667	)
Total	$	23,417		$	24,106

The Company is obligated under a number of non-cancelable operating leases for premises and equipment expiring in various years through 2026. Total lease expense approximated $2,834,000, $2,755,000 and $2,465,000 for the years ended December 31, 2016, 2015 and 2014, respectively. Included in lease expense are amounts paid to a company affiliated with Marshall M. Sloane, Chairman of the Board, amounting to $424,000, $413,000, and $208,000, respectively. Rental income approximated $318,000, $314,000 and $307,000 in 2016, 2015 and 2014, respectively. Depreciation and amortization amounted to $3,099,000, $2,728,000, and $2,322,000 at December 31, 2016, 2015 and 2014 respectively.

Future minimum rental commitments for non-cancelable operating leases with initial or remaining terms of one year or more at December 31, 2016, were as follows:

Year		Amount
(dollars in thousands)
	2017	$	2,408
	2018		2,222
	2019		2,054
	2020		1,777
	2021		1,326
	Thereafter		2,526
		$	12,313

8.     Goodwill and Identifiable Intangible Assets

At December 31, 2016 and 2015, the Company concluded that it is not more likely than not that fair value of the reporting unit is less than its carrying value, and goodwill is not considered to be impaired.

65

Notes to Consolidated Financial Statements — (Continued)

The changes in goodwill and identifiable intangible assets for the years ended December 31, 2016 and 2015 are shown in the table below.

Carrying Amount of Goodwill and Intangibles	Goodwill		Mortgage Servicing Rights			Total
(dollars in thousands)
Balance at December 31, 2014	$	2,714	$	941		$	3,655
Additions		—		626			626
Amortization Expense		—		(262	)		(262	)
Balance at December 31, 2015	$	2,714	$	1,305		$	4,019
Additions		—		708			708
Amortization Expense		—		(384	)		(384	)
Balance at December 31, 2016	$	2,714	$	1,629		$	4,343

9.     Fair Value Measurements

The Company follows FASB ASC 820-10, Fair Value Measurements and Disclosures, which among other things, requires enhanced disclosures about assets and liabilities carried at fair value. ASC 820-10 establishes a hierarchal disclosure framework associated with the level of pricing observability utilized in measuring financial instruments at fair value. The three broad levels of the hierarchy are as follows:

Level I — Quoted prices are available in active markets for identical assets or liabilities as of the reported date. The type of financial instruments included in Level I are highly liquid cash instruments with quoted prices such as G-7 government, agency securities, listed equities and money market securities, as well as listed derivative instruments.

Level II — Pricing inputs are other than quoted prices in active markets, which are either directly or indirectly observable as of the reported date. The nature of these financial instruments include cash instruments for which quoted prices are available but traded less frequently, derivative instruments whose fair value have been derived using a model where inputs to the model are directly observable in the market, or can be derived principally from or corroborated by observable market data, and instruments that are fair valued using other financial instruments, the parameters of which can be directly observed. Instruments which are generally included in this category are corporate bonds and loans, mortgage whole loans, municipal bonds and OTC derivatives.

Level III — These instruments have little to no pricing observability as of the reported date. These financial instruments do not have two-way markets and are measured using management’s best estimate of fair value, where the inputs into the determination of fair value require significant management judgment or estimation. Instruments that are included in this category generally include certain commercial mortgage loans, certain private equity investments, distressed debt, non-investment grade residual interests in securitizations, as well as certain highly structured OTC derivative contracts.

66

Notes to Consolidated Financial Statements — (Continued)

The results of the fair value hierarchy as of December 31, 2016, are as follows:

	Fair Value Measurements Using
	Carrying Value		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Observable Inputs (Level 2)		Significant Other Unobservable Inputs (Level 3)
(dollars in thousands)
Financial Instruments Measured at Fair Value on a Recurring Basis — Securities AFS
U.S. Treasury	$	2,000	$	—	$	2,000	$	—
U.S. Government Agency Sponsored Enterprises		24,952		—		24,952		—
SBA Backed Securities		57,767		—		57,767		—
U.S. Government Agency and Sponsored Enterprises Mortgage-Backed Securities		243,325		—		243,325		—
Privately Issued Residential Mortgage-Backed Securities		1,109		—		1,109		—
Obligations Issued by States and Political Subdivisions		164,876		—		—		164,876
Other Debt Securities		4,924		—		4,924		—
Equity Securities		344		344		—		—
Total	$	499,297	$	344	$	334,077	$	164,876
Financial Instruments Measured at Fair Value on a Non-recurring Basis
Impaired Loans	$	260	$	—	$	—	$	260

Impaired loan balances in the table above represent those collateral dependent loans where management has estimated the credit loss by comparing the loan’s carrying value against the expected realizable fair value of the collateral. Fair value is generally determined through a review process that includes independent appraisals, discounted cash flows, or other external assessments of the underlying collateral, which generally include various Level 3 inputs which are not identifiable. The Company discounts the fair values, as appropriate, based on management’s observations of the local real estate market for loans in this category.

Appraisals, discounted cash flows and real estate tax assessments are reviewed quarterly. There is no specific policy regarding how frequently appraisals will be updated. Adjustments are made to appraisals and real estate tax assessments based on management’s estimate of changes in real estate values. Within the past twelve months there have been no updated appraisals, however, all impaired loans have been reviewed during the past quarter using either a discounted cash flow analysis or other type of real estate tax assessment. The types of adjustments that are made to specific provisions (credits) relate to impaired loans recognized for 2016 for the estimated credit loss amounted to ($135,000).

There were no transfers between level 1, 2 and 3 for the year ended December 31, 2016. There were no liabilities measured at fair value on a recurring or nonrecurring basis during the year ended December 31, 2016.

67

Notes to Consolidated Financial Statements — (Continued)

The following table presents additional information about assets measured at fair value on a recurring and nonrecurring basis for which the Company has utilized Level 3 inputs to determine fair value (dollars in thousands) at December 31, 2016. Management continues to monitor the assumptions used to value the assets listed below.

Asset	Fair Value		Valuation Technique	Unobservable Input	Unobservable Input Value or Range
Securities AFS(1)	$	164,876	Discounted cash flow	Discount rate	0%-1%(2)
Impaired Loans		260	Appraisal of collateral(3)	Appraisal adjustments(4)	0%-30% discount

(1) Municipal securities generally have maturities of one year or less and, therefore, the amortized cost equates to the fair value.

(2) Weighted averages.

(3) Fair value is generally determined through independent appraisals of the underlying collateral, which generally include various Level 3 inputs which are not identifiable.

(4) Appraisals may be adjusted by management for qualitative factors such as economic conditions and estimated expenses.

The changes in Level 3 securities for the year ended December 31, 2016 are as shown in the table below:

	Auction Rate Securities		Obligations Issued by States and Political Subdivisions			Equity Securities			Total
(dollars in thousands)
Balance at December 31, 2015	$	3,820	$	153,140		$	37		$	156,997
Purchases		—		216,646			—			216,646
Maturities/redemptions		—		(208,990	)		(37	)		(209,027	)
Amortization		—		(218	)		—			(218	)
Change in fair value		478		—			—			478
Balance at December 31, 2016	$	4,298	$	160,578		$	—		$	164,876

The amortized cost of Level 3 securities was $165,281,000 with an unrealized loss of $405,000 at December 31, 2016. The securities in this category are generally equity investments, municipal securities with no readily determinable fair value or failed auction rate securities. Management evaluated the fair value of these securities based on an evaluation of the underlying issuer, prevailing rates and market liquidity.

68

Notes to Consolidated Financial Statements — (Continued)

The results of the fair value hierarchy as of December 31, 2015, are as follows:

	Fair Value Measurements Using
	Carrying Value		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Observable Inputs (Level 2)		Significant Other Unobservable Inputs (Level 3)
(dollars in thousands)
Financial Instruments Measured at Fair Value on a Recurring Basis — Securities AFS
U.S. Treasury	$	1,989	$	—	$	1,989	$	—
SBA Backed Securities		5,989		—		5,989		—
U.S. Government Agency and Sponsored Enterprises Mortgage-Backed Securities		233,526		—		233,526		—
Privately Issued Residential Mortgage-Backed Securities		1,434		—		1,434		—
Obligations Issued by States and Political Subdivisions		156,960		—		—		156,960
Other Debt Securities		4,473		—		4,473		—
Equity Securities		252		215		—		37
Total	$	404,623	$	215	$	247,411	$	156,997
Financial Instruments Measured at Fair Value on a Non-recurring Basis
Impaired Loans	$	1,056	$	—	$	—	$	1,056

Appraisals, discounted cash flows and real estate tax assessments are reviewed quarterly. There is no specific policy regarding how frequently appraisals will be updated. Adjustments are made to appraisals and real estate tax assessments based on management’s estimate of changes in real estate values. Within the past twelve months there have been no updated appraisals, however, all impaired loans have been reviewed during the past quarter using either a discounted cash flow analysis or other type of real estate tax assessment. The types of adjustments that are made to specific provisions (credits) relate to impaired loans recognized for 2015 for the estimated credit loss amounted to ($165,000).

There were no transfers between level 1 and 2 for the year ended December 31, 2015. There were no liabilities measured at fair value on a recurring or nonrecurring basis during the year ended December 31, 2015.

The following table presents additional information about assets measured at fair value on a recurring and nonrecurring basis for which the Company has utilized Level 3 inputs to determine fair value (dollars in thousands) at December 31, 2015. Management continues to monitor the assumptions used to value the assets listed below.

Asset	Fair Value		Valuation Technique	Unobservable Input	Unobservable Input Value or Range
Securities AFS(1)	$	156,997	Discounted cash flow	Discount rate	0%-1%(2)
Impaired Loans		1,056	Appraisal of collateral(3)	Appraisal adjustments(4)	0%-30% discount

⁽¹⁾ Municipal securities generally have maturities of one year or less and, therefore, the amortized cost equates to the fair value.

⁽²⁾ Weighted averages.

⁽³⁾ Fair value is generally determined through independent appraisals of the underlying collateral, which generally include various Level 3 inputs which are not identifiable.

⁽⁴⁾ Appraisals may be adjusted by management for qualitative factors such as economic conditions and estimated expenses.

69

Notes to Consolidated Financial Statements — (Continued)

The changes in Level 3 securities for the year ended December 31, 2015 are as shown in the table below:

	Auction Rate Securities		Obligations Issued by  States and Political Subdivisions			Equity Securities			Total
(dollars in thousands)
Balance at December 31, 2014	$	3,820	$	92,964		$	102		$	96,886
Purchases		—		207,509			—			207,509
Maturities/redemptions		—		(147,277	)		(65	)		(147,342	)
Amortization		—		(56	)		—			(56	)
Change in fair value		—		—			—			—
Balance at December 31, 2015	$	3,820	$	153,140		$	37		$	156,997

The amortized cost of Level 3 securities was $157,874,000 with an unrealized loss of $877,000 at December 31, 2015. The securities in this category are generally equity investments, municipal securities with no readily determinable fair value or failed auction rate securities. Management evaluated the fair value of these securities based on an evaluation of the underlying issuer, prevailing rates and market liquidity.

10.     Deposits

The following is a summary of remaining maturities or re-pricing of time deposits as of December 31,

	2016		Percent			2015		Percent
(dollars in thousands)
Within one year	$	262,406		55	%	$	315,559		67	%
Over one year to two years		87,952		18	%		44,838		9	%
Over two years to three years		83,067		17	%		49,538		10	%
Over three years to five years		44,934		10	%		63,491		14	%
Total	$	478,359		100	%	$	473,426		100	%

Time deposits of more than $250,000 totaled $250,476,000 and $193,598,000 in 2016 and 2015, respectively.

Deposits totaling $26,191,000 and $21,970,000 were attributable to related parties at December 31, 2016 and December 31, 2015, respectively.

11.     Securities Sold Under Agreements to Repurchase

The following is a summary of securities sold under agreements to repurchase as of December 31,

	2016			2015			2014
(dollars in thousands)
Amount outstanding at December 31	$	182,280		$	197,850		$	212,360
Weighted average rate at December 31		0.21	%		0.21	%		0.18	%
Maximum amount outstanding at any month end	$	241,110		$	299,890		$	243,750
Daily average balance outstanding during the year	$	222,956		$	245,276		$	216,937
Weighted average rate during the year		0.21	%		0.20	%		0.18	%

70

Notes to Consolidated Financial Statements — (Continued)

Amounts outstanding at December 31, 2016, 2015 and 2014 carried maturity dates of the next business day. U.S. Government Sponsored Enterprise securities with a total amortized cost of $183,829,000, $199,152,000, and $213,817,000 were pledged as collateral and held by custodians to secure the agreements at December 31, 2016, 2015 and 2014, respectively. The approximate fair value of the collateral at those dates was $182,074,000, $197,318,000, and $212,255,000, respectively.

12.     Other Borrowed Funds and Subordinated Debentures

The following is a summary of other borrowed funds and subordinated debentures as of December 31,

	2016			2015			2014
(dollars in thousands)
Amount outstanding at December 31	$	329,083		$	404,083		$	431,583
Weighted average rate at December 31		2.39	%		2.29	%		1.91	%
Maximum amount outstanding at any month end	$	467,083		$	521,583		$	431,583
Daily average balance outstanding during the year	$	357,974		$	374,109		$	271,710
Weighted average rate during the year		2.48	%		2.38	%		3.34	%

FEDERAL HOME LOAN BANK BORROWINGS

Federal Home Loan Bank of Boston (“FHLBB”) borrowings are collateralized by a blanket pledge agreement on the Bank’s FHLBB stock, certain qualified investment securities, deposits at the FHLBB and residential mortgages held in the Bank’s portfolios. The Bank’s remaining term borrowing capacity at the FHLBB at December 31, 2016, was approximately $239,163,000. In addition, the Bank has a $14,500,000 line of credit with the FHLBB. A schedule of the maturity distribution of FHLBB advances with the weighted average interest rates is as follows:

	2016					2015					2014
December 31,	Amount		Weighted Average Rate			Amount		Weighted Average Rate			Amount		Weighted Average Rate
(dollars in thousands)
Within one year	$	77,500		2.21	%	$	100,000		1.89	%	$	169,500		0.51	%
Over one year to two years	$	54,500		2.25	%	$	57,500		2.72	%	$	55,000		3.07	%
Over two years to three years	$	58,000		1.87	%	$	54,500		2.25	%	$	45,000		3.18	%
Over three years to five years	$	58,000		2.68	%	$	91,000		1.85	%	$	70,000		2.43	%
Over five years	$	45,000		2.85	%	$	65,000		3.23	%	$	56,000		3.16	%
Total	$	293,000		2.34	%	$	368,000		2.30	%	$	395,500		1.89	%

Included in the table above are $45,000,000, $55,000,000 and $35,000,000 respectively, of FHLBB advances at December 31, 2016, 2015 and 2014, that are putable at the discretion of FHLBB. These put dates were not utilized in the table above.

SUBORDINATED DEBENTURES

In December 2004, the Company consummated the sale of a trust preferred securities offering, in which it issued $36,083,000 of subordinated debt securities due 2034 to its newly formed unconsolidated subsidiary Century Bancorp Capital Trust II.

Century Bancorp Capital Trust II then issued 35,000 shares of Cumulative Trust Preferred Securities with a liquidation value of $1,000 per share. These securities paid dividends at an annualized rate of 6.65% for the first ten years and then converted to the three-month LIBOR rate plus 1.87% for the remaining 20 years. The coupon rate on these securities was 2.83% at December 31, 2016.

71

Notes to Consolidated Financial Statements — (Continued)

OTHER BORROWED FUNDS

There were no overnight federal funds purchased at December 31, 2016 and 2015.

13.     Reclassifications Out of Accumulated Other Comprehensive Income(a)

	Amount Reclassified from Accumulated Other Comprehensive Income
Details about Accumulated Other Comprehensive Income Components	Year ended December 31, 2016(a)			Year ended December 31, 2015(a)			Affected line item in the Statement Where Net Income is Presented
Unrealized gains and losses on available-for-sale securities	$	52		$	594		Net gains on sales of investments
		(20	)		(233	)	Provision for income taxes
	$	32		$	361		Net income
Accretion of unrealized losses transferred	$	(4,317	)	$	(5,502	)	Securities held-to-maturity
		1,505			1,919		Provision for income taxes
	$	(2,812	)	$	(3,583	)	Net income
Amortization of defined benefit pension items
Prior-service costs	$	(10	)	$	(10	)	Salaries and employee benefits(b)
Actuarial gains (losses)		(1,606	)		(1,411	)	Salaries and employee benefits(b)
Total before tax		(1,616	)		(1,421	)	Income before taxes
Tax (expense) or benefit		646			568		Provision for income taxes
Net of tax	$	(970	)	$	(853	)	Net income

^(a) Amounts in parentheses indicate decreases to profit/loss.

^(b) These accumulated other comprehensive income components are included in the computation of net periodic pension cost (see employee benefits footnote (Note 17) for additional details).

14.     Earnings per share (“EPS”)

Class A and Class B shares participate equally in undistributed earnings. Under the Company’s Articles of Organization, the holders of Class A Common Stock are entitled to receive dividends per share equal to at least 200% of dividends paid, if any, from time to time, on each share of Class B Common Stock.

Diluted EPS includes the dilutive effect of common stock equivalents; basic EPS excludes all common stock equivalents. The only common stock equivalents for the Company are the stock options discussed below. The dilutive effect of these stock options for 2016, 2015 and 2014 was an increase of 0, 0, and 1,447 shares, respectively.

72

Notes to Consolidated Financial Statements — (Continued)

The following table is a reconciliation of basic EPS and diluted EPS:

Year Ended December 31,	2016		2015		2014
(in thousands except share and per share data)
BASIC EPS COMPUTATION
Numerator:
Net income, Class A	$	19,270	$	18,081	$	17,157
Net income, Class B		5,264		4,940		4,703
Denominator:
Weighted average shares outstanding, Class A		3,600,729		3,600,729		3,591,732
Weighted average shares outstanding, Class B		1,967,180		1,967,180		1,969,030
Basic EPS, Class A	$	5.35	$	5.02	$	4.78
Basic EPS, Class B	$	2.68	$	2.51	$	2.39
DILUTED EPS COMPUTATION
Numerator:
Net income, Class A	$	19,270	$	18,081	$	17,157
Net income, Class B		5,264		4,940		4,703
Total net income, for diluted EPS, Class A computation		24,534		23,021		21,860
Denominator:
Weighted average shares outstanding, basic, Class A		3,600,729		3,600,729		3,591,732
Weighted average shares outstanding, Class B		1,967,180		1,967,180		1,969,030
Dilutive effect of Class A stock options		—		—		1,447
Weighted average shares outstanding diluted, Class A		5,567,909		5,567,909		5,562,209
Weighted average shares outstanding, Class B		1,967,180		1,967,180		1,969,030
Diluted EPS, Class A	$	4.41	$	4.13	$	3.93
Diluted EPS, Class B	$	2.68	$	2.51	$	2.39

15.     Stockholders’ Equity

DIVIDENDS

Holders of the Class A common stock may not vote in the election of directors but may vote as a class to approve certain extraordinary corporate transactions. Holders of Class B common stock may vote in the election of directors. Class A common stockholders are entitled to receive dividends per share equal to at least 200% per share of that paid, if any, on each share of Class B common stock. Class A common stock is publicly traded. Class B common stock is not publicly traded; however, it can be converted on a per share basis to Class A common stock at any time at the option of the holder. Dividend payments by the Company are dependent in part on the dividends it receives from the Bank, which are subject to certain regulatory restrictions.

STOCK OPTION PLAN

During 2000 and 2004, common stockholders of the Company approved stock option plans (the “Option Plans”) that provide for granting of options for not more than 150,000 shares of Class A common stock per plan. Under the Option Plans, all officers and key employees of the Company are eligible to receive nonqualified and incentive stock options to purchase shares of Class A common stock. The Option Plans are administered by the

73

Notes to Consolidated Financial Statements — (Continued)

Compensation Committee of the Board of Directors, whose members are ineligible to participate in the Option Plans. Based on management’s recommendations, the Committee submits its recommendations to the Board of Directors as to persons to whom options are to be granted, the number of shares granted to each, the option price (which may not be less than 85% of the fair market value for nonqualified stock options, or the fair market value for incentive stock options, of the shares on the date of grant) and the time period over which the options are exercisable (not more than ten years from the date of grant). There were no options outstanding at December 31, 2016 and December 31, 2015.

Stock option activity under the plan is as follows:

	December 31, 2016				December 31, 2015				December 31, 2014
	Amount		Weighted Average Exercise Price		Amount		Weighted Average Exercise Price		Amount			Weighted Average Exercise Price
Shares under option:
Outstanding at beginning of year		—	$	—		—	$	—		20,375		$	31.82
Forfeited		—		—		—		—		(9,050	)		31.83
Exercised		—		—		—		—		(11,325	)		31.81
Outstanding at end of year		—	$	—		—	$	—		—		$	—
Exercisable at end of year		—	$	—		—	$	—		—		$	—
Available to be granted at end of year		233,934				233,934				233,934

The weighted average intrinsic value of options exercised for the period ended December 31, 2014, was $8.76 per share with an aggregate value of $99,217.

CAPITAL RATIOS

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

Quantitative measures established by regulation to ensure capital adequacy require the Bank and the Company to maintain minimum amounts and ratios (set forth in the table below) of total and Tier 1 capital (as defined in the regulation) to risk-weighted assets (as defined) and Tier 1 capital (as defined) to average assets (as defined). Management believes, as of December 31, 2016, that the Bank and the Company meet all capital adequacy requirements to which they are subject.

The Basel Committee has issued capital standards entitled “Base III: A global framework for more resilient banks and banking systems” (Basel III). The Federal Reserve has finalized its rule implementing the Basel III regulatory capital framework. The rule was effective in January 2015 and sets the Basel III minimum Regulatory capital requirements. To be categorized as well capitalized, the Bank must maintain minimum total risk-based, Common Equity tier 1, tier 1 risk-based, and Tier 1 leverage ratios as set forth in the table. There are no conditions or events since that notification that management believes would cause a change in the Bank’s categorization.

74

Notes to Consolidated Financial Statements — (Continued)

The Bank’s actual capital amounts and ratios are presented in the following table:

	Actual					For  Capital Adequacy Purposes					To Be Well Capitalized Under Prompt Corrective Action Provisions
	Amount		Ratio			Amount		Ratio			Amount		Ratio
As of December 31, 2016
Total Capital (to Risk-Weighted Assets)	$	293,143		12.27	%	$	191,081		8.00	%	$	238,851		10.00	%
Tier 1 Capital (to Risk-Weighted Assets)		268,737		11.25	%		143,311		6.00	%		191,081		8.00	%
Common Equity Tier 1 Capital (to Risk-Weighted Assets)		268,737		11.25	%		107,483		4.50	%		155,253		6.50	%
Tier 1 Capital (to 4th Qtr. Average Assets)		268,737		6.02	%		178,469		4.00	%		223,086		5.00	%
As of December 31, 2015
Total Capital (to Risk-Weighted Assets)	$	278,769		12.03	%	$	185,320		8.00	%	$	231,650		10.00	%
Tier 1 Capital (to Risk-Weighted Assets)		255,694		11.04	%		138,990		6.00	%		185,320		8.00	%
Common Equity Tier 1 Capital (to Risk-Weighted Assets)		255,694		11.04	%		104,242		4.50	%		150,572		6.50	%
Tier 1 Capital (to 4th Qtr. Average Assets)		255,964		6.48	%		157,734		4.00	%		197,167		5.00	%

The Company’s actual capital amounts and ratios are presented in the following table:

	Actual					For Capital Adequacy Purposes					To Be Well Capitalized Under Prompt Corrective Action Provisions
	Amount		Ratio			Amount		Ratio			Amount		Ratio
As of December 31, 2016
Total Capital (to Risk-Weighted Assets)	$	305,065		12.72	%	$	191,904		8.00	%	$	239,880		10.00	%
Tier 1 Capital (to Risk-Weighted Assets)		280,659		11.70	%		143,928		6.00	%		191,904		8.00	%
Common Equity Tier 1 Capital (to Risk-Weighted Assets)		249,753		10.41	%		107,946		4.50	%		155,922		6.50	%
Tier 1 Capital (to 4th Qtr. Average Assets)		280,659		6.28	%		178,903		4.00	%		223,628		5.00	%
As of December 31, 2015
Total Capital (to Risk-Weighted Assets)	$	291,635		12.54	%	$	186,021		8.00	%	$	232,526		10.00	%
Tier 1 Capital (to Risk-Weighted Assets)		268,560		11.55	%		139,515		6.00	%		186,021		8.00	%
Common Equity Tier 1 Capital (to Risk-Weighted Assets)		233,560		10.04	%		104,637		4.50	%		151,142		6.50	%
Tier 1 Capital (to 4th Qtr. Average Assets)		268,560		6.79	%		158,114		4.00	%		197,642		5.00	%

75

Notes to Consolidated Financial Statements — (Continued)

16.     Income Taxes

The current and deferred components of income tax (benefit) expense for the years ended December 31, are as follows:

	2016			2015			2014
(dollars in thousands)
Current expense:
Federal	$	3,875		$	3,393		$	3,981
State		439			399			498
Total current expense		4,314			3,792			4,479
Deferred (benefit) expense:
Federal		(4,450	)		(3,098	)		(3,179	)
State		(334	)		(161	)		(434	)
Valuation allowance		108			—			—
Total deferred benefit		(4,676	)		(3,259	)		(3,613	)
Provision for income taxes	$	(362	)	$	533		$	866

Income tax accounts included in other assets at December 31, are as follows:

	2016		2015
(dollars in thousands)
Currently receivable	$	633	$	1,217
Deferred income tax asset, net		43,129		40,157
Total	$	43,762	$	41,374

Differences between income tax (benefit) expense at the statutory federal income tax rate and total income tax expense are summarized as follows:

	2016			2015			2014
(dollars in thousands)
Federal income tax expense at statutory rates	$	8,218		$	8,008		$	7,727
State income tax, net of federal income tax benefit		69			157			42
Insurance income		(406	)		(375	)		(353	)
Effect of tax-exempt interest		(8,259	)		(6,915	)		(6,097	)
Net tax credit		(395	)		(460	)		(517	)
Valuation allowance		108			—			—
Other		303			118			64
Total	$	(362	)	$	533		$	866
Effective tax rate		(1.50	)%		2.30	%		3.80	%

76

Notes to Consolidated Financial Statements — (Continued)

The following table sets forth the Company’s gross deferred income tax assets and gross deferred income tax liabilities at December 31:

	2016			2015
(dollars in thousands)
Deferred income tax assets:
Allowance for loan losses	$	10,419		$	9,852
AMT credit		10,234			7,041
Deferred compensation		9,684			8,495
Pension and SERP liability		7,658			8,714
Unrealized losses on securities transferred to held-to-maturity		3,161			4,667
Depreciation		968			673
Accrued bonus		612			508
Unrealized (gains) losses on securities available-for-sale		357			108
Charitable contributions carryforward		266			—
Acquisition premium		128			231
Nonaccrual interest		125			138
Limited partnerships		30			52
Investments write down		26			26
Other		220			173
Gross deferred income tax asset		43,888			40,678
Valuation allowance		(108	)		—
Gross deferred income tax asset,net of valuation allowance		43,780			40,678
Deferred income tax liabilities:
Mortgage servicing rights		(651	)		(521	)
Gross deferred income tax liability		(651	)		(521	)
Deferred income tax asset net	$	43,129		$	40,157

Based on the Company’s historical and current pre-tax earnings, management believes it is more likely than not that the Company will realize the deferred income tax asset existing at December 31, 2016, with the exception of a $108,000 valuation allowance on a charitable contribution carryforward that has a remaining carryforward period of four years. Management believes that existing net deductible temporary differences which give rise to the deferred tax asset will reverse during periods in which the Company generates net taxable income. In addition, gross deductible temporary differences are expected to reverse in periods during which offsetting gross taxable temporary differences are expected to reverse. Factors beyond management’s control, such as the general state of the economy and real estate values, can affect future levels of taxable income, and no assurance can be given that sufficient taxable income will be generated to fully absorb gross deductible temporary differences. The Company is in an Alternative Minimum Tax (“AMT”) credit position. The AMT credit is carried as a deferred asset and has an indefinite life. The Company’s intent is not to perpetually remain an AMT taxpayer and has potential tax planning strategies available which support the deferred AMT credit and, at this time, no valuation allowance is needed. The Company and its subsidiaries file a consolidated federal tax return. The Company is subject to federal examinations for tax years after December 31, 2013, and state examinations for the tax years after December 31, 2012.

77

Notes to Consolidated Financial Statements — (Continued)

17. Employee Benefits

The Company has a Qualified Defined Benefit Pension Plan (the “Plan”), which had been offered to all employees reaching minimum age and service requirements. In 2006, the Bank became a member of the Savings Bank Employees Retirement Association (“SBERA”) within which it then began maintaining the Qualified Defined Benefit Pension Plan. SBERA offers a common and collective trust as the underlying investment structure for its retirement plans. The target allocation mix for the common and collective trust portfolio calls for an equity-based investment deployment range of 40% to 64% of total portfolio assets. The remainder of the portfolio is allocated to fixed income securities with target range of 15% to 25% and other investments including global asset allocation and hedge funds from 20% to 36%.

The Trustees of SBERA, through its Investment Committee, select investment managers for the common and collective trust portfolio. A professional investment advisory firm is retained by the Investment Committee to provide allocation analysis, performance measurement and to assist with manager searches. The overall investment objective is to diversify investments across a spectrum of investment types to limit risks from large market swings. The Company closed the plan to employees hired after March 31, 2006.

The measurement date for the Plan is December 31 for each year. The benefits expected to be paid in each year from 2017 to 2021 are $1,457,000, $1,481,000, $1,516,000, $1,671,000, and $1,863,000, respectively. The aggregate benefits expected to be paid in the five years from 2022 to 2026 are $10,650,000. The Company plans to contribute $1,000,000 to the Plan in 2017.

The fair value of plan assets and major categories as of December 31, 2016, is as follows:

Asset Category	Percent			Total		Level 1		Level 2		Level 3
(dollars in thousands)
Collective fund		59.3	%	$	22,209	$	4,708	$	17,501	$	—
Equity securities		19.7	%		7,363		7,363		—		—
Mutual funds		12.3	%		4,615		4,615		—		—
Hedge funds		7.4	%		2,786		—		—		2,786
Short-term investments		1.3	%		474		474		—		—
		100.0	%	$	37,447	$	17,160	$	17,501	$	2,786

The fair value of plan assets and major categories as of December 31, 2015, is as follows:

Asset Category	Percent			Total		Level 1		Level 2		Level 3
(dollars in thousands)
Collective fund		61.20	%	$	20,627	$	4,307	$	16,320	$	—
Equity securities		17.70	%		5,990		5,990		—		—
Mutual funds		11.90	%		4,001		4,001		—		—
Hedge funds		7.50	%		2,524		—		—		2,524
Short-term investments		1.70	%		575		575		—		—
		100.00	%	$	33,717	$	14,873	$	16,320	$	2,524

LEVEL 1

The plan assets measured at fair value in Level 1 are based on quoted market prices in an active exchange market.

78

Notes to Consolidated Financial Statements — (Continued)

LEVEL 2

Plan assets measured at fair value in Level 2 are based on pricing models that consider standard input factors, such as observable market data, benchmark yields, interest rate volatilities, broker/dealer quotes, credit spreads and new issue data.

LEVEL 3

Plan assets measured at fair value in Level 3 are based on unobservable inputs, which includes SBERA’s assumptions and the best information available under the circumstance. Level 3 assets consist of hedge funds. The underlying assets are valued based upon quoted exchange prices, over-the-counter trades, bid/ask prices, relative value assessments based on market conditions, and other information, as available. Further adjustments may be made based on factors impacting liquidity.

The asset or liability’s fair value measurement level within fair value hierarchy is based on the lowest level of any input that is significant to the fair value measurement. Valuation techniques used need to maximize the use of observable inputs and minimize the use of unobservable inputs. Below is a description of the valuation methodologies used for assets measured at fair value.

The Trust reports bonds and other obligations, short-term investments and equity securities at fair values based on published quotations, Collective funds and hedge funds (Funds) are valued in accordance with valuations provided by such Funds, which generally value marketable securities at the last reported sales price on the valuation date and other investments at fair value, as determined by each Fund’s manager.

The preceding methods described may produce a fair value calculation that may not be indicative of net realizable value or reflective of future values. Furthermore, although the Trust believes its valuation methods are appropriate and consistent with other market participants, the use of different methodologies to determine the fair value of certain financial instruments could result in a different fair value measurement at the reporting date.

The changes in Level 3 securities are shown in the table below:

Year Ended December 31,	2016			2015
(dollars in thousands)
Balance at beginning of year	$	2,524		$	2,360
Purchases		114			224
Redemptions		(309	)		(40	)
Actual return – assets still being held		457			(20	)
Balance at end of year	$	2,786		$	2,524

There were no transfers in or out of level 3 during the year ended December 31, 2016 and 2015.

The performance of the plan assets is dependent upon general market conditions and specific conditions related to the issuers of the underlying securities.

The Company has a Supplemental Executive Insurance/Retirement Plan (the Supplemental Plan), which is limited to certain officers and employees of the Company. The Supplemental Plan is voluntary. Under the Supplemental Plan, each participant will receive a retirement benefit based on compensation and length of service. Life insurance policies, which are owned by the Company, are purchased covering the lives of each participant.

The benefits expected to be paid in each year from 2017 to 2021 are $2,031,000, $1,990,000, $1,964,000, $1,906,000 and $1,830,000, respectively. The aggregate benefits expected to be paid in the five years from 2022 to 2026 are $11,972,000.

79

Notes to Consolidated Financial Statements — (Continued)

	Defined Benefit Pension Plan						Supplemental Insurance/ Retirement Plan
	2016			2015			2016			2015
(dollars in thousands)
Change projected in benefit obligation
Benefit obligation at beginning of year	$	38,597		$	40,011		$	38,204		$	31,989
Service cost		1,273			1,343			1,820			1,589
Interest cost		1,358			1,576			1,334			1,365
Actuarial (gain)/loss		2,593			(3,424	)		(1,653	)		4,304
Benefits paid		(1,566	)		(909	)		(1,095	)		(1,043	)
Projected benefit obligation at end of year	$	42,255		$	38,597		$	38,610		$	38,204
Change in plan assets
Fair value of plan assets at beginning of year	$	33,717		$	33,812
Actual return on plan assets		3,221			(1,186	)
Employer contributions		2,075			2,000
Benefits paid		(1,566	)		(909	)
Fair value of plan assets at end of year	$	37,447		$	33,717
(Unfunded) Funded status	$	(4,808	)	$	(4,880	)	$	(38,610	)	$	(38,204	)
Accumulated benefit obligation	$	42,255		$	38,597		$	36,392		$	34,884
Weighted-average assumptions as of December 31
Discount rate — Liability		3.99	%		4.18	%		3.85	%		4.03	%
Discount rate — Expense		4.18	%		4.00	%		4.01	%		4.00	%
Expected return on plan assets		8.00	%		8.00	%		NA			NA
Rate of compensation increase		4.00	%		4.00	%		4.00	%		4.00	%
Components of net periodic benefit cost
Service cost	$	1,273		$	1,343		$	1,820		$	1,589
Interest cost		1,358			1,576			1,334			1,365
Expected return on plan assets		(2,776	)		(2,749	)		—			—
Recognized prior service cost		(104	)		(104	)		114			114
Recognized net losses		801			812			805			599
Net periodic cost (benefit)	$	552		$	878		$	4,073		$	3,667
Other changes in plan assets and benefit obligations recognized in other comprehensive income
Amortization of prior service cost	$	104		$	104		$	(114	)	$	(114	)
Net (gain) loss		1,347			(301	)		(2,458	)		3,705
Total recognized in other comprehensive income		1,451			(197	)		(2,572	)		3,591
Total recognized in net periodic benefit cost and other comprehensive income	$	2,003		$	681		$	1,501		$	7,258

80

Notes to Consolidated Financial Statements — (Continued)

	December 31, 2016									December 31, 2015
	Plan			Supplemental Plan			Total			Plan			Supplemental Plan			Total
(dollars in thousands)
Prior service cost	$	204		$	(649	)	$	(445	)	$	308		$	(763	)	$	(455	)
Net actuarial loss		(13,999	)		(13,416	)		(27,415	)		(12,652	)		(15,874	)		(28,526	)
Total	$	(13,795	)	$	(14,065	)	$	(27,860	)	$	(12,344	)	$	(16,637	)	$	(28,981	)

The following table summarizes the amounts included in Accumulated Other Comprehensive Loss at December 31, 2016, expected to be recognized as components of net periodic benefit cost in the next year:

	Plan			Supplemental Plan
Amortization of prior service cost to be recognized in 2017	$	(104	)	$	114
Amortization of loss to be recognized in 2017		903			636

Assumptions for the expected return on plan assets and discount rates in the Company’s Plan and Supplemental Plan are periodically reviewed. As part of the review, management in consultation with independent consulting actuaries performs an analysis of expected returns based on the plan’s asset allocation. This forecast reflects the Company’s and actuarial firm’s expected return on plan assets for each significant asset class or economic indicator. The range of returns developed relies on forecasts and on broad market historical benchmarks for expected return, correlation and volatility for each asset class. Also, as a part of the review, the Company’s management in consultation with independent consulting actuaries performs an analysis of discount rates based on expected returns of high-grade fixed income debt securities.

Effective January 1, 2016, the Company changed its estimate of the service and interest components of the net periodic benefit cost. Previously, the Company estimated the service and interest cost components utilizing a single weighted-average discount rate derived from the yield curve used to measure the benefit obligation. The new estimate utilizes a full yield curve approach in the estimation of these components by applying the specific spot rates along the yield curve used in the determination of the benefit obligation to their underlying projected cash flows. The new estimate provided a more precise measurement of service and interests costs by improving the correlation between projected benefit cash flows and their corresponding spot rates. The change does not affect the measurement of the Company’s benefit obligations and it is accounted for as a change in accounting estimate, which is applied prospectively. For 2016, the change in estimate reduced periodic plan cost by $859,000 compared to the prior estimate. Mortality assumptions are based on the RP 2015 Mortality Table projected with Scale MP 2016.

The Company offers a 401(k) defined contribution plan for all employees reaching minimum age and service requirements. The plan is voluntary and employee contributions are matched by the Company at a rate of 33.3% for the first 6% of compensation contributed by each employee. The Company’s match totaled $418,000 for 2016, $403,000 for 2015 and $346,000 for 2014. Administrative costs associated with the plan are absorbed by the Company.

The Company has a cash incentive plan that is designed to reward our executives and officers for the achievement of annual financial performance goals of the Company as well as business line, department and individual performance. The plan supports the philosophy that management be measured for their performance as a team in the attainment of these goals. Discretionary bonus expense amounted to $1,418,000, $1,178,000 and $1,434,000 in 2016, 2015, and 2014, respectively.

The Company does not offer any postretirement programs other than pensions.

81

Notes to Consolidated Financial Statements — (Continued)

18.    Commitments and Contingencies

A number of legal claims against the Company arising in the normal course of business were outstanding at December 31, 2016. Management, after reviewing these claims with legal counsel, is of the opinion that their resolution will not have a material adverse effect on the Company’s consolidated financial position or results of operations.

19.    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. Financial instruments with off-balance-sheet risk at December 31 are as follows:

Contract or Notional Amount

	2016		2015
(dollars in thousands)
Financial instruments whose contract amount represents credit risk:
Commitments to originate 1–4 family mortgages	$	13,877	$	5,638
Standby and commercial letters of credit		6,796		4,936
Unused lines of credit		362,357		320,874
Unadvanced portions of construction loans		22,049		11,589
Unadvanced portions of other loans		52,224		41,717

Commitments to originate loans, unadvanced portions of construction loans, unused lines of credit and unused letters of credit are generally agreements to lend to a customer, provided there is no violation of any condition established in the contract. Commitments generally have fixed expiration dates or other termination clauses and may require payment of a fee. Since many of the commitments are expected to expire without being drawn upon, the total commitment amounts do not necessarily represent future cash requirements. The Company evaluates each customer’s creditworthiness on a case-by-case basis. The amount of collateral obtained, if deemed necessary by the Company upon extension of credit, is based on management’s credit evaluation of the borrower.

Standby letters of credit are conditional commitments issued by the Company to guarantee the performance by a customer to a third party. The credit risk involved in issuing letters of credit is essentially the same as that involved in extending loan facilities to customers.

82

Notes to Consolidated Financial Statements — (Continued)

20.    Other Operating Expenses

Year ended December 31,	2016		2015		2014
(dollars in thousands)
Marketing	$	2,185	$	1,849	$	1,793
Software maintenance/amortization		1,863		1,670		1,524
Legal and audit		1,255		1,269		1,072
Contributions		789		690		735
Processing services		1,040		1,002		944
Consulting		1,168		1,050		964
Postage and delivery		987		905		964
Supplies		948		965		870
Telephone		1,032		804		753
Directors’ fees		413		377		389
Insurance		323		301		304
Other		1,812		1,826		1,520
Total	$	13,815	$	12,708	$	11,832

21.    Fair Values of Financial Instruments

The following methods and assumptions were used by the Company in estimating fair values of its financial instruments. Excluded from this disclosure are all non-financial instruments. Accordingly, the aggregate fair value amounts presented do not represent the underlying value of the Company.

The assumptions used below are expected to approximate those that market participants would use in valuing these financial instruments.

Fair value estimates are made at a specific point in time, based on available market information and judgments about the financial instrument, including estimates of timing, amount of expected future cash flows and the credit standing of the issuer. Such estimates do not consider the tax impact of the realization of unrealized gains or losses. In some cases, the fair value estimates cannot be substantiated by comparison to independent markets. In addition, the disclosed fair value may not be realized in the immediate settlement of the financial instrument. Care should be exercised in deriving conclusions about our business, its value or financial position based on the fair value information of financial instruments presented below.

SECURITIES HELD-TO-MATURITY

The fair values of these securities were based on quoted market prices, where available, as provided by third-party investment portfolio pricing vendors. If quoted market prices were not available, fair values provided by the vendors were based on quoted market prices of comparable instruments in active markets and/or based on a matrix pricing methodology which employs The Bond Market Association’s standard calculations for cash flow and price/yield analysis, live benchmark bond pricing and terms/condition data available from major pricing sources. Management regards the inputs and methods used by third party pricing vendors to be “Level 2 inputs and methods” as defined in the “fair value hierarchy” provided by FASB.

LOANS

For variable-rate loans, that reprice frequently and with no significant change in credit risk, fair values are based on carrying amounts. The fair value of other loans is estimated using discounted cash flow analysis, based on interest rates currently being offered for loans with similar terms to borrowers of similar credit quality. Incremental credit risk for nonperforming loans has been considered.

83

Notes to Consolidated Financial Statements — (Continued)

TIME DEPOSITS

The fair value of time deposits was estimated using a discounted cash flow approach that applies prevailing market interest rates for similar maturity instruments. The fair values of the Company’s time deposit liabilities do not take into consideration the value of the Company’s long-term relationships with depositors, which may have significant value.

OTHER BORROWED FUNDS

The fair value of other borrowed funds is based on the discounted value of contractual cash flows. The discount rate used is estimated based on the rates currently offered for other borrowed funds of similar remaining maturities.

SUBORDINATED DEBENTURES

The fair value of subordinated debentures is based on the discounted value of contractual cash flows. The discount rate used is estimated based on the rates currently offered for other subordinated debentures of similar remaining maturities.

The following presents (in thousands) the carrying amount, estimated fair value, and placement in the fair value hierarchy of the Company’s financial instruments as of December 31, 2016 and December 31, 2015. This table excludes financial instruments for which the carrying amount approximates fair value. Financial assets for which the fair value approximates carrying value include cash and cash equivalents, short-term investments, FHLBB stock and accrued interest receivable. Financial liabilities for which the fair value approximates carrying value include non-maturity deposits, short-term borrowings and accrued interest payable.

	Carrying Amount		Estimated Fair Value		Level 1 Inputs		Fair Value Measurements Level 2 Inputs		Level 3 Inputs
(dollars in thousands)
December 31, 2016
Financial assets:
Securities held-to-maturity	$	1,653,986	$	1,635,808	$	—	$	1,635,808	$	—
Loans(1)		1,899,527		1,873,703		—		—		1,873,703
Financial liabilities:
Time deposits		478,359		480,133		—		480,133		—
Other borrowed funds		293,000		294,940		—		294,940		—
Subordinated debentures		36,083		36,083		—		—		36,083
December 31, 2015
Financial assets:
Securities held-to-maturity	$	1,438,903	$	1,438,960	$	—	$	1,438,960	$	—
Loans(1)		1,708,461		1,677,270		—		—		1,677,270
Financial liabilities:
Time deposits		473,426		474,046		—		474,046		—
Other borrowed funds		368,000		372,209		—		372,209		—
Subordinated debentures		36,083		36,083		—		—		36,083

(1) Comprised of loans (including collateral dependent impaired loans), net of deferred loan costs and the allowance for loan losses.

84

Notes to Consolidated Financial Statements — (Continued)

LIMITATIONS

Fair value estimates are made at a specific point in time, based on relevant market information and information about the type of financial instrument. These estimates do not reflect any premium or discount that could result from offering for sale at one time the Bank’s entire holdings of a particular financial instrument. Because no active market exists for some of the Bank’s financial instruments, fair value estimates are based on judgments regarding future expected loss experience, cash flows, current economic conditions, risk characteristics and other factors. These estimates are subjective in nature and involve uncertainties and matters of significant judgment and therefore cannot be determined with precision. Changes in assumptions and changes in the loan, debt and interest rate markets could significantly affect the estimates. Further, the income tax ramifications related to the realization of the unrealized gains and losses can have a significant effect on the fair value estimates and have not been considered.

22.     Quarterly Results of Operations (unaudited)

2016 Quarters	Fourth			Third			Second		First
(in thousands, except share data)
Interest income	$	24,689		$	25,005		$	23,742	$	23,263
Interest expense		5,927			5,791			5,486		5,413
Net interest income		18,762			19,214			18,256		17,850
Provision for loan losses		200			375			350		450
Net interest income after provision for loan losses		18,562			18,839			17,906		17,400
Other operating income		3,700			4,225			4,643		3,654
Operating expenses		16,156			16,630			16,288		15,683
Income before income taxes		6,106			6,434			6,261		5,371
Provision for income taxes		(394	)		(52	)		20		64
Net income	$	6,500		$	6,486		$	6,241	$	5,307
Share data:
Average shares outstanding, basic
Class A		3,600,729			3,600,729			3,600,729		3,600,729
Class B		1,967,180			1,967,180			1,967,180		1,967,180
Average shares outstanding, diluted
Class A		5,567,909			5,567,909			5,567,909		5,567,909
Class B		1,967,180			1,967,180			1,967,180		1,967,180
Earnings per share, basic
Class A	$	1.42		$	1.41		$	1.36	$	1.16
Class B	$	0.71		$	0.71		$	0.68	$	0.58
Earnings per share, diluted
Class A	$	1.17		$	1.16		$	1.12	$	0.95
Class B	$	0.71		$	0.71		$	0.68	$	0.58

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Notes to Consolidated Financial Statements — (Continued)

2015 Quarters	Fourth			Third		Second		First
(in thousands, except share data)
Interest income	$	22,496		$	23,750	$	22,675	$	21,172
Interest expense		5,274			5,134		4,961		4,765
Net interest income		17,222			18,616		17,714		16,407
Provision for loan losses		—			—		—		200
Net interest income after provision for loan losses		17,222			18,616		17,714		16,207
Other operating income		4,448			3,830		4,210		3,505
Operating expenses		15,794			16,100		15,766		14,538
Income before income taxes		5,876			6,346		6,158		5,174
Provision for income taxes		(95	)		180		233		215
Net income	$	5,971		$	6,166	$	5,925	$	4,959
Share data:
Average shares outstanding, basic
Class A		3,600,729			3,600,729		3,600,729		3,600,729
Class B		1,967,180			1,967,180		1,967,180		1,967,180
Average shares outstanding, diluted
Class A		5,567,909			5,567,909		5,567,909		5,567,909
Class B		1,976,180			1,967,180		1,967,180		1,967,180
Earnings per share, basic
Class A	$	1.30		$	1.35	$	1.29	$	1.08
Class B	$	0.65		$	0.67	$	0.65	$	0.54
Earnings per share, diluted
Class A	$	1.07		$	1.11	$	1.06	$	0.89
Class B	$	0.65		$	0.67	$	0.65	$	0.54

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Notes to Consolidated Financial Statements — (Continued)

23.     Parent Company Financial Statements

The balance sheets of Century Bancorp, Inc. (“Parent Company”) as of December 31, 2016 and 2015 and the statements of income and cash flows for each of the years in the three-year period ended December 31, 2016, are presented below. The statements of changes in stockholders’ equity are identical to the consolidated statements of changes in stockholders’ equity and are therefore not presented here.

BALANCE SHEETS

December 31,	2016		2015
(dollars in thousands)
ASSETS:
Cash	$	2,768	$	5,230
Investment in subsidiary, at equity		263,070		236,629
Other assets		10,335		8,808
Total assets	$	276,173	$	250,667
LIABILITIES AND STOCKHOLDERS’ EQUITY:
Liabilities	$	49	$	40
Subordinated debentures		36,083		36,083
Stockholders’ equity		240,041		214,544
Total liabilities and stockholders’ equity	$	276,173	$	250,667

STATEMENTS OF INCOME

Year Ended December 31,	2016			2015			2014
(dollars in thousands)
Income:
Dividends from subsidiary	$	2,000		$	1,500		$	—
Interest income from deposits in bank		3			13			21
Other income		28			24			72
Total income		2,031			1,537			93
Interest expense		937			792			2,329
Operating expenses		220			212			204
Income before income taxes and equity in undistributed income of subsidiary		874			533			(2,440	)
Benefit from income taxes		(383	)		(328	)		(830	)
Income before equity in undistributed income of subsidiary		1,257			861			(1,610	)
Equity in undistributed income of subsidiary		23,277			22,160			23,470
Net income	$	24,534		$	23,021		$	21,860

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Notes to Consolidated Financial Statements — (Continued)

STATEMENTS OF CASH FLOWS

December 31,	2016			2015			2014
(dollars in thousands)
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$	24,534		$	23,021		$	21,860
Adjustments to reconcile net income to net cash provided by operating activities
Undistributed income of subsidiary		(23,277	)		(22,160	)		(23,470	)
Depreciation and amortization		—			3			12
Increase in other assets		(1,527	)		(1,112	)		(1,067	)
Decrease in liabilities		9			4			(71	)
Net cash (used in) operating activities		(261	)		(244	)		(2,736	)
CASH FLOWS FROM FINANCING ACTIVITIES:
Net proceeds from the exercise of stock options		—			—			361
Cash dividends paid		(2,201	)		(2,200	)		(2,196	)
Net cash used in financing activities		(2,201	)		(2,200	)		(1,835	)
Net (decrease) in cash		(2,462	)		(2,444	)		(4,571	)
Cash at beginning of year		5,230			7,674			12,245
Cash at end of year	$	2,768		$	5,230		$	7,674

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Report of Independent Registered Public Accounting Firm

KPMG LLP

Independent Registered Public Accounting Firm

Two Financial Center

60 South Street

Boston, Massachusetts 02111-2759

The Board of Directors and Stockholders

Century Bancorp, Inc.:

We have audited the accompanying consolidated balance sheets of Century Bancorp, Inc. and its subsidiary as of December 31, 2016 and 2015 and the related consolidated statements of income, comprehensive income, changes in stockholders’ equity, and cash flows for each of the years in the three-year period ended December 31, 2016. These consolidated financial statements are the responsibility of the Company’s management. Our responsibility is to express an opinion on these consolidated financial statements based on our audits.

We conducted our audits in accordance with the standards of the Public Company Accounting Oversight Board (United States). Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements are free of material misstatement. An audit includes examining, on a test basis, evidence supporting the amounts and disclosures in the financial statements. An audit also includes assessing the accounting principles used and significant estimates made by management, as well as evaluating the overall financial statement presentation. We believe that our audits provide a reasonable basis for our opinion.

In our opinion, the consolidated financial statements referred to above present fairly, in all material respects, the financial position of Century Bancorp, Inc. and its subsidiary as of December 31, 2016 and 2015 and the results of their operations and their cash flows for each of the years in the three-year period ended December 31, 2016, in conformity with U.S. generally accepted accounting principles.

We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States), Century Bancorp, Inc.’s internal control over financial reporting as of December 31, 2016, based on criteria established in Internal Control—Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission (COSO) and our report dated March 15, 2017, expressed an unqualified opinion on the effectiveness of the Company’s internal control over financial reporting.

Boston, Massachusetts

March 15, 2017

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Report of Independent Registered Public Accounting Firm

KPMG LLP

Independent Registered Public Accounting Firm

Two Financial Center

60 South Street

Boston, Massachusetts 02111-2759

The Board of Directors and Stockholders

Century Bancorp, Inc.:

We have audited Century Bancorp, Inc.’s internal control over financial reporting as of December 31, 2016, based on criteria established in Internal Control – Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission (COSO). Century Bancorp, Inc.’s management is responsible for maintaining effective internal control over financial reporting and for its assessment of the effectiveness of internal control over financial reporting, included in the accompanying “Management’s Report on Internal Control Over Financial Reporting.” Our responsibility is to express an opinion on the Company’s internal control over financial reporting based on our audit.

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

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

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

In our opinion, Century Bancorp, Inc. maintained, in all material respects, effective internal control over financial reporting as of December 31, 2016, based on criteria established in Internal Control—Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission (COSO).

We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States), the consolidated balance sheets of Century Bancorp, Inc. as of December 31, 2016 and 2015 and the related consolidated statements of income, comprehensive income, changes in stockholders’ equity, and cash flows for each of the years in the three-year period ended December 31, 2016, and our report dated March 15, 2017, expressed an unqualified opinion on those consolidated financial statements.

Boston, Massachusetts

March 15, 2017

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Management’s Report on Internal Control Over Financial Reporting

CENTURY BANCORP, INC.

400 Mystic Avenue

Medford, Massachusetts 02155

We, together with the other members of executive management of Century Bancorp, Inc. and our subsidiary (the “Company”), are responsible for establishing and maintaining adequate internal control over financial reporting. The Company’s internal control system was designed to provide reasonable assurance to the Company’s management and board of directors regarding the preparation and fair presentation of published financial statements.

All internal control systems, no matter how well designed, have inherent limitations. Therefore, even those systems determined to be effective can provide only reasonable assurance with respect to financial statement preparation and presentation.

The Company’s management assessed the effectiveness of the Company’s internal control over financial reporting as of December 31, 2016. In making this assessment, it used the criteria set forth by the Committee of Sponsoring Organizations of the Treadway Commission (“COSO”) in Internal Control – Integrated Framework (2013). Based on our assessment, we believe that, as of December 31, 2016, the Company’s internal control over financial reporting is effective based on those criteria.

The Company’s independent registered public accounting firm has issued an audit report on the effectiveness of the Company’s internal control over financial reporting. Their report appears on page 90.

Barry R. Sloane	William P. Hornby, CPA
President & CEO	Chief Financial Officer & Treasurer
March 15, 2017

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PART III

ITEM 10. DIRECTORS, EXECUTIVE OFFICERS AND CORPORATE GOVERNANCE

The directors of the Company and their ages are as follows:

Name	Age		Position
George R. Baldwin		73	Director, Century Bancorp, Inc., and Century Bank and Trust Company
Stephen R. Delinsky		72	Director, Century Bancorp, Inc., and Century Bank and Trust Company
Louis J. Grossman.		67	Director, Century Bancorp, Inc., and Century Bank and Trust Company
Russell B. Higley, Esquire		77	Director, Century Bancorp, Inc., and Century Bank and Trust Company
Jackie Jenkins-Scott		67	Director, Century Bancorp, Inc., and Century Bank and Trust Company
Linda Sloane Kay		55	Director, Century Bancorp, Inc.; Director and Executive Vice President, Century Bank and Trust Company
Fraser Lemley		76	Director, Century Bancorp, Inc., and Century Bank and Trust Company
Joseph P. Mercurio		68	Director, Century Bancorp, Inc., and Century Bank and Trust Company
Joseph J. Senna, Esquire		77	Director, Century Bancorp, Inc., and Century Bank and Trust Company
Jo Ann Simons		64	Director, Century Bancorp, Inc., and Century Bank and Trust Company
Barry R. Sloane		61	Director, President and Chief Executive Officer, Century Bancorp, Inc.; Director, President and Chief Executive Officer, Century Bank and Trust Company
Marshall M. Sloane		90	Chairman of the Board, Century Bancorp, Inc. and Century Bank and Trust Company
George F. Swansburg		74	Director, Century Bancorp, Inc., and Century Bank and Trust Company
Jon Westling		74	Director, Century Bancorp, Inc., and Century Bank and Trust Company

Mr. Baldwin became a director of the Company in 1996. He has been a director of Century Bank and Trust Company since 1995. Mr. Baldwin is President and CEO of G. Baldwin & Co., a financial service firm. He was formerly CEO, Owner and Director of Kaler Carney Liffler, a multi-state regional insurance agency; and subsequently he became Chairman of the New England area of Arthur J. Gallagher & Co., America’s third largest insurance broker. Mr. Baldwin’s extensive three-decade background in banking and insurance is relevant to Century’s insurance and financial customers and qualifies him to continue to serve as a director of the Company.

Mr. Delinsky became a director of the Company and of Century Bank in 2013. He is an attorney with the law firm of Clark, Hunt, Ahearn & Embry. Prior to that, Mr. Delinsky was an attorney at the law firm of Eckert Seamans Cherin & Mellott, LLC. Mr. Delinsky’s experience as an attorney, and expertise in civil and criminal trial experience in state and federal courts, has qualified him to serve as director of the Company.

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Mr. Grossman became a director of the Company and of Century Bank and Trust Company in January, 2016. Mr. Grossman has been President and Treasurer of The Grossman Companies, Inc. since 1980, when he and his father, Morton, purchased the family real estate business. In January, 2015 he became Chairman. Mr. Grossman’s experience and expertise in real estate, which is relevant to customer relationships of the Company, qualifies him to serve as director of the Company.

Mr. Higley became a director of the Company in 1996. He has been a director of Century Bank and Trust Company since 1986. Mr. Higley is an attorney in private practice. Mr. Higley’s experience as an attorney and expertise in the real estate industry, which is relevant to real estate customers of the Company, has qualified him to serve as director of the Company. Also, his tenure and experience as a director of the Company has qualified him to continue to serve.

Ms. Jenkins-Scott became a director of the Company and of Century Bank and Trust Company in 2006. Ms. Jenkins-Scott is past President of Boston’s Wheelock College. Ms. Jenkins-Scott’s experience as President of a college and expertise in the educational field as well as President and CEO of a non-profit entity, which is relevant to certain customer relationships of the Company, has qualified her to serve as director of the Company. Also, her tenure and experience as a director of the Company has qualified her to continue to serve.

Ms. Kay became a director of the Company in 2005. Ms. Kay joined Century Bank and Trust Company in 1983 as Assistant Vice President and currently serves as Executive Vice President. Ms. Kay’s experience in business development, customer relationships and tenure at Century Bank and Trust Company has qualified her to serve as director of the Company.

Mr. Lemley became a director of the Company in 1996. He has been a director of Century Bank and Trust Company since 1988. Mr. Lemley is Chairman of the Board and CEO of Sentry Auto Group. Mr. Lemley’s experience as CEO of a company and expertise in the automotive industry, which is relevant to certain other customers in the automotive industry of the Company, has qualified him to serve as director of the Company. Also, his tenure and experience as a director of the Company has qualified him to continue to serve.

Mr. Mercurio became a director of the Company in 1990 and a director of Century Bank and Trust Company in 1995 and voluntarily resigned in 2004. He was then re-elected in 2010. In December, 2010, Mr. Mercurio retired as Executive Vice President of Boston University having completed 38 years of service. He currently serves as Senior Vice President for Administration & Finance at Quincy College. Mr. Mercurio’s experience in the educational field, which is relevant to certain customer relationships of the Company, has qualified him to serve as director of the Company. Also, his tenure and experience as a director of the Company has qualified him to continue to serve.

Mr. Senna became a director of the Company in 1986. He has been a director of Century Bank and Trust Company since 1979. Mr. Senna is an attorney and managing partner of C&S Capital Properties, LLC, a real estate management and development firm. Mr. Senna’s experience as an attorney and expertise in the real estate industry, which is relevant to real estate related customers in addition to his years of service as Chairman of the Audit Committee, has qualified him to serve as director of the Company. Also, his tenure and experience as a director of the Company has qualified him to continue to serve.

Ms. Simons became a director of the Company and a director of Century Bank and Trust Company in January, 2016. Ms. Simons is CEO of Northeast ARC and was President and CEO of Cardinal Cushing Centers, Inc. from 2008 through January, 2016. These nonprofit organizations specialize in the support of individuals with disabilities. Ms. Simons’ experience and expertise with nonprofit organizations, which is relevant to customer relationships of the Company, qualifies her to serve as director of the Company.

Mr. Barry R. Sloane has been a director of the Company and Century Bank and Trust Company since 1997. Mr. Sloane is President and CEO of Century Bancorp and President and CEO of Century Bank and Trust Company. Mr. Sloane is also a trustee of the Savings Bank Employee Retirement System (SBERA). Mr. Sloane’s experience at the Company as well as his experience at other financial services companies and expertise in the financial services industry has qualified him to serve as director of the Company.

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Mr. Marshall M. Sloane is the founder of the Company and is currently the Chairman of the Board. He founded Century Bank and Trust Company in 1969 and is currently the Chairman of the Board. Mr. Sloane’s extensive banking experience qualifies him to serve as Chairman of the Board.

Mr. Swansburg became a director of the Company in 1986. He has been a director of Century Bank and Trust Company since 1992. From 1992 to 1998 he was President and Chief Operating Officer of Century Bank and Trust Company. He is now retired from Century Bank and Trust Company. Mr. Swansburg’s experience as President and Chief Operating Officer of Century Bank and Trust Company and expertise in the banking industry has qualified him to serve as a director of the Company. Also, his tenure and experience as a director of the Company has qualified him to continue to serve.

Mr. Westling became a director of the Company in 1996. He has been a director of Century Bank and Trust Company since 1995. Mr. Westling is President Emeritus and Professor of History and Humanities at Boston University. Mr. Westling’s experience as president of a University and expertise in the educational field, which is relevant to certain customer relationships of the Company, has qualified him to serve as director of the Company. Also, his tenure and experience as a director of the Company has qualified him to continue to serve.

All of the Company’s directors are elected annually and hold office until their successors are duly elected and qualified. A majority of the members of the Company’s Board of Directors have been determined by the Company’s Board of Directors to be independent within the meaning of current FINRA listing standards. There are no family relationships between any of the directors or executive officers, except that Barry R. Sloane is the son of Marshall M. Sloane and Linda Sloane Kay is the daughter of Marshall M. Sloane.

Executive officers are elected annually by the Board prior to the Annual Meeting of Shareholders to serve for a one year term and until their successors are elected and qualified. The following table sets forth the name and age of each executive officer of the Company and the principal positions and offices he/she holds with the Company.

Marshall M. Sloane	Chairman of the Board of the Company and Century Bank and Trust Company. Mr. Sloane is 90 years old.
Barry R. Sloane	Director, President and CEO; Director, President and CEO, Century Bank and Trust Company. Mr. Sloane is 61 years old.
William P. Hornby	Chief Financial Officer and Treasurer; Chief Financial Officer and Treasurer, Century Bank and Trust Company. Mr. Hornby is 50 years old. He joined the Company in 2007.
Paul A. Evangelista	Executive Vice President, Century Bank and Trust Company with responsibility for retail, operations and marketing. Mr. Evangelista is 53 years old. He joined the Company in 1999.
Brian J. Feeney	Executive Vice President, Century Bank and Trust Company, Head of Institutional Services Group. Mr. Feeney is 56 years old. He joined the Company in 1989.
Linda Sloane Kay	Executive Vice President, Century Bank and Trust Company with responsibility for business development. Ms. Kay is 55 years old. She joined the Company in 1983.
David B. Woonton	Executive Vice President, Century Bank and Trust Company with responsibility for lending. Mr. Woonton is 61 years old. He joined the Company in 1999.

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The Audit Committee

The Audit Committee meets with KPMG LLP, the Company’s independent registered public accounting firm, in connection with the annual audit and quarterly reviews of the Company’s financial statements. The Audit Committee was composed of four directors during 2016, Joseph J. Senna, Chair, Stephen R. Delinsky, Joseph P. Mercurio, and Jon Westling, each of whom the Board of Directors has determined is independent under current FINRA listing standards. The Board of Directors has determined that Mr. Senna and Mr. Mercurio qualify as “audit committee financial experts”, as that term is defined in Item 407(d)(5) of Regulation S-K promulgated by the SEC. The Audit Committee reviews the findings and recommendations of the FRB, FDIC, and the Massachusetts Division of Banks in connection with their examinations and the internal audit reports and procedures for the Company and its subsidiaries. The Audit Committee met five times during 2016.

Audit Committee Report

The Audit Committee of the Company’s Board of Directors is responsible for providing independent, objective oversight of the Company’s accounting functions and internal controls. The Audit Committee reviews: the financial information provided to shareholders and others; the systems of internal controls regarding finance, accounting, legal/regulatory compliance, and ethics; and the audit and financial reporting processes. The Audit Committee operates under a written charter first adopted and approved by the Board of Directors in 2000. The Audit Committee has reviewed and reassessed its Charter. Management is responsible for the Company’s internal controls and financial reporting process. The independent registered public accounting firm is responsible for performing an independent audit of the Company’s consolidated financial statements in accordance with the standards of the Public Company Accounting Oversight Board (United States) and to issue their reports thereon. The Audit Committee’s responsibility is to monitor and oversee these processes.

The Audit Committee has reviewed and discussed the audited financial statements with management and the independent registered public accounting firm. The Audit Committee has also discussed with KPMG LLP, the independent registered public accounting firm for the Company, the matters required to be discussed by the Public Company Accounting Oversight Board (PCAOB) Auditing Standard No. 16, Communication with Audit Committees.

The Audit Committee has also received the written disclosures and the letter from KPMG LLP as required by the PCAOB. The Audit Committee has discussed with KPMG LLP the firm’s independence, including a review of audit and non-audit fees and services, and concluded that KPMG LLP is independent.

Based on the review and discussions referred to in the paragraph above, the Audit Committee recommended to the Board of Directors that the audited consolidated financial statements be included in the Company’s Annual Report on Form 10-K for the last fiscal year for filing with the Securities and Exchange Commission.

/s/ Joseph J. Senna, Chair

/s/ Stephen R. Delinsky

/s/ Joseph Mercurio

/s/ Jon Westling

Nominating Committee

The Company’s Nominating Committee has three director members, Stephen R. Delinsky, Fraser Lemley and Jon Westling, each of whom the Board of Directors has determined to be independent under the NASDAQ current listing standards. The Nominating Committee operates pursuant to a written policy. The nominating committee implements the process by identifying a potential candidate and evaluating whether the candidate is eligible and qualified for service. The Committee has developed criteria for the selection of new directors to the Board, including but not limited to, diversity, age, skills, experience, time availability (including the number of other boards a director candidate sits on), NASDAQ listing standards, applicable federal and state laws and regulations, Board and Company needs and such other criteria as the Committee shall determine to be relevant. The committee’s effectiveness is assessed by reviewing existing Board of Directors attendance and performance; experience, skills and contributions that the existing Director brings to the Board; and independence, prior to nominating an existing director for reelection.

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Board Leadership Structure

The Company has implemented a careful succession plan by separating the CEO and Chairman’s position. The positions were separated to retain Marshall M. Sloane, who is a valuable asset given his history with the Company and his experience, as Chairman. Barry R. Sloane is the CEO. Marshall M. Sloane continues as Chairman of the Board.

Oversight of Risk

The Board oversees risk through various Board Committees which report directly to the Board. Also, various committees comprised of Company management report to the Board.

The principal Board Committees responsible for overseeing the various elements of risk are the Audit Committee, the Asset Liability Committee and the Executive Committee. The Audit Committee is responsible for monitoring all elements of risk, primarily through its oversight of the internal audit program. The Asset Liability Committee monitors interest rate risk principally through management’s models and simulations. The Executive Committee monitors credit risk through its review of large originators, classified assets, and the calculation of the allowance for loan losses and concentrations of credits.

The principal committees comprised of management are Management Committee, Corporate Risk Management Committee, Loan Approval Committee and Asset Liability Pricing Committee. Management Committee is comprised of senior management and is responsible for overseeing all elements of risk. The Corporate Risk Management Committee meets quarterly to address specific elements of risk. Loan Approval Committee is responsible for overseeing credit risk. The Asset Liability Committee oversees interest rate risk. The committees comprised of management report to the Board of Directors, as needed, through senior management’s attendance and reporting at Board of Directors meetings.

Code of Ethics

The Company has adopted a Code of Ethics that applies to its principal executive officer, principal financial officer, principal accounting officer or persons performing similar functions. A copy of the Company’s Code of Ethics may be obtained upon written request to Investor Relations, Century Bancorp, Inc., 400 Mystic Avenue, Medford, Massachusetts 02155.

Section 16(a) Beneficial Ownership Reporting Compliance

Based solely on a review of the copies of Forms 3, 4 and 5 and amendments thereto, if any, and any written representations furnished to the Company, none of the Company’s officers or Directors failed to file on a timely basis reports required by Section 16 of the Securities Exchange Act of 1934 during the fiscal year ended December 31, 2016, or in prior fiscal years.

Based solely on a review of Forms 4 filed with the SEC during the fiscal year ended December 31, 2016, the Company believes a beneficial owner of more than 10% of the Company’s Class A Common Stock, James J. Filler, timely filed all reports he was required to file during the aforementioned fiscal year except one report covering a total of one transaction that was filed late by Mr. Filler.

ITEM 11. EXECUTIVE COMPENSATION

The following is a discussion and analysis of our executive compensation policies and practices with respect to compensation reported for fiscal year 2016.

Introduction

The following discussion and analysis includes separate sections on:

• The Composition and Responsibilities of the Compensation Committee

• The Company’s Executive Compensation Conclusion

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• Compensation Discussion and Analysis

• Philosophy and Objectives of the Company

• Compensation Process

• Compensation Consultant

• Compensation Components

• Post-Employment Compensation

• Chief Executive Officer Compensation

• Executive Officer Compensation

• Consulting Services Agreements

• Employment Agreements

• Report of the Compensation Committee

Composition and Responsibilities of the Compensation Committee

The Compensation Committee is a committee of the Board of Directors composed of Fraser Lemley as Chairman, Joseph Mercurio and Jon Westling, each of whom the Board has determined is independent as defined by the FINRA current listing standards.

The Compensation Committee oversees compensation programs applicable to employees at all levels of the Company and makes decisions regarding executive compensation that is intended to align total compensation with business objectives and enable the Company to attract, retain and reward individuals who are contributing to the Company’s success.

The Compensation Committee reviews the Company’s cash incentive, stock incentive, retirement, and benefit plans and makes its recommendations to the Board with respect to these areas.

All decisions with respect to executive and director compensation are approved by the Compensation Committee and recommended to the full Board for ratification.

The Company’s Executive Compensation Conclusion

Based upon review, the Compensation Committee and the Board of Directors found the Company’s Chief Executive Officer’s, the Chief Financial Officer’s and the other Named Executive Officers’ total compensation to be reasonable. In addition to the other factors noted, the Committee and the Board considered that the Company maintains only one change of control provision and did not award stock incentive awards for fiscal year 2016. It should be noted that when the Committee and the Board considers any component of executive compensation, the mix and aggregate amounts of all components are taken into consideration.

Compensation Discussion and Analysis (CD&A)

Philosophy and Objectives of Company

The Company’s executive compensation philosophy is based on the following principles:

• Compensation programs should be designed to attract and retain executives, to motivate them to achieve and to reward them appropriately for their performance.

• Compensation should be competitive and equitable in light of the executive’s responsibilities, experience, and performance.

• Provide annual compensation that takes into account the Company’s performance with respect to its financial and strategic objectives, the performance of functions and business areas under the executive’s management and the results of established goals;

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• Align the financial interests of the executive with those of shareholders by providing both short-term and long-term incentives;

• Offer a total compensation program for each executive based on (i) the level of responsibility of the executive’s position, (ii) the experience and skills necessary relative to the other senior management positions, (iii) comparison of compensation to similarly positioned executives of peer financial institutions; and

• Evaluate the overall compensation of our executives in light of general economic and specific company, industry and competitive considerations.

Compensation Process

The Company maintains governance practices to ensure that it can reach its compensation-related decisions in an informed and appropriate manner.

Base salaries, which are the Company’s major element of compensation, are reviewed for executive officers and employees at the regularly scheduled fall meeting of the Compensation Committee. At this meeting the Committee also reviews and adopts, as appropriate, proposals for the discretionary officer cash incentive plan for the new fiscal year, stock option grants, additions, amendments, modifications or terminations of retirement and benefit programs.

The Compensation Committee’s process incorporates the following:

• The Committee operates under a written charter which is periodically reviewed. The Committee amended its charter in 2013 to conform to NASDAQ compensation committee rule amendments.

• The Committee meets with representatives of management to review and discuss prepared materials and issues.

• The Committee considers recommendations from the Chief Executive Officer with respect to the compensation of the Company’s Named Executive Officers.

• Our independent compensation consultant attends Committee meetings as requested.

• The Committee meets and deliberates privately without management present. Our consultant participates in these sessions as requested.

• The Committee may consult with the non-management and independent directors regarding decisions affecting Executive compensation.

• The Committee reports the Committee’s major actions to the entire Board at the Board of Director’s meeting in December or the following January.

• The Committee recommends for approval to the Board of Directors the fees for our Board and Board Committees.

• The Board of Directors then considers the report of the Compensation Committee and accepts or amends and approves or ratifies all matters presented for consideration.

To the extent permitted by applicable law, the Committee or the Board may delegate to management certain of its duties and responsibilities, including with respect to the adoption, amendment, modification or termination of benefit plans and with respect to the awards of stock options under certain stock plans.

Compensation Consultant

When making determinations regarding the compensation paid to our executives the Compensation Committee and the Board of Directors rely, in part, on the expertise of our independent compensation consultant, Thomas Warren & Associates, to conduct an assessment of our executive compensation. In addition to conferring with certain executives, the consultant works with internal company support staff to obtain compensation and market data. Thomas Warren & Associates identifies a group of peer companies in consideration of such factors as asset size, geography, type of financial services offered and the complexity and scope of operations and makes use of executive compensation comparisons, published surveys and peer analyses.

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The Compensation Committee and the Board of Directors took Thomas Warren & Associates’ recommendations into consideration when setting base salaries for fiscal 2016.

Compensation Components

With respect to Executive compensation, the Company reviews the mix of base salary, cash and stock based incentive plans and benefits for our individual executives, however, there is no specific formula for allocating between cash and non-cash compensation. The competitiveness of total compensation potential for our executives is reviewed against industry practices and the Company’s peers as identified by our independent compensation consultant. The major elements of the Company’s executive compensation package (i.e., base salary, cash and stock based incentive plans) are similar to those found in many companies.

Base Salary Compensation:

When evaluating executive base salary compensation, the Company takes into consideration such factors as:

• The attainment of business and strategic goals and the financial performance of the Company;

• The importance, complexity, and level of responsibility of the executive’s position within the organizational structure;

• The performance of the executive’s business area’s goals and the accomplishment of objectives for the previous year;

• The difficulty of achieving desired results;

• The value of the executive’s unique skills, abilities and general management capabilities to support the long-term performance of the Company;

• The executive’s contribution as a member of the Executive Management Team.

While the Company reviews numerous quantitative and qualitative factors noted above when determining executive base salary compensation, the performance of the Company’s stock is not generally considered a factor in this determination as the price of the Company’s common stock is subject to various factors beyond the Company’s control. The Company believes that the price of the stock in the long-term will reflect the Company’s operating performance and how well our executives manage the Company.

Ultimately, the Compensation Committee and the Board of Directors have the authority to use discretion when making executive compensation determinations after review of all the information that they deem relevant.

Cash Incentive Plan:

The Company has a discretionary cash incentive plan that is designed to reward our executives and officers for the achievement of annual financial performance goals of the Company as well as business line, department and individual performance. The plan supports the philosophy that management be measured for their performance as a team in the attainment of these goals.

Awards are based upon the attainment of established objectives including profitability, expense control, sales volumes and overall job performance. Awards are generally not granted unless the Company achieves certain financial targets.

Upon recommendation of the Compensation Committee, the Board of Directors determines the aggregate amount, if any, to be awarded. In recognition of the Company’s solid performance, discretionary awards were granted for fiscal 2016. Awards for the Chief Executive Officer and the other Named Executive Officers were reviewed and approved by the Board of Directors and are noted on the Summary Compensation Table.

Stock Option Plans:

During 2000 and 2004, common stockholders of the Company approved stock option plans (the “Option Plans”) to encourage ownership of Class A common stock of the Company by directors, officers and employees

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of the Company and its Affiliates and to provide additional incentives for them to promote the success of the Company’s business through awards of or relating to shares of the Company’s Class A common stock. Under the Option Plans, all officers and key employees of the Company are eligible to receive non-qualified and incentive stock options to purchase shares of Class A common stock. The Option Plans are administered by the Compensation Committee of the Board of Directors, whose members are ineligible to participate in the Option Plans. Based on management’s recommendations, the Committee submits its recommendations to the Board of Directors as to persons to whom options are to be granted, the number of shares granted to each, the option price (which may not be less than 85% of the stocks trading value for non-qualified stock options, or the fair market value for incentive stock options, of the shares on the date of grant) and the time period over which the options are exercisable (not more than ten years from the date of the grant).

The Compensation Committee has complete discretion to make or select the manner of making all necessary determinations with respect to each option to be granted by the committee under the Option Plans including the director, employee, or officer to receive an Option. However, in determining the long-term incentive component (stock incentive plan) of executive compensation, the Committee does consider the Company’s performance and relative shareholder return, the value of similar incentives awards at peer companies and the awards given in past years. The Committee may take into account the nature of the services provided by the respective officers, employees, and directors, their present and potential contributions to the success of the Company, and any other factors that the Compensation Committee, in its discretion, determines are relevant.

Option grants were not awarded in 2016.

Post-Employment Compensation

Defined Benefit Pension Plan:

The Company had a qualified Defined Benefit Pension Plan which had been offered to all employees reaching a minimum age and service requirement. In 2006 the Bank became a member of the Savings Bank Employee Retirement Association (“SBERA”) within which it maintains the qualified Defined Benefit Pension Plan. SBERA offers a common and collective trust as the underlying investment structure for pension plans participating in SBERA. The Trustee of SBERA, through SBERA’s Investment Committee, selects investment managers for the common and collective trust portfolio. A professional advisory firm is retained by the Investment Committee to provide allocation analysis, performance measurement and to assist with manager searches. The overall investment objective is to diversify equity investments across a spectrum of investment types. (e.g. small cap, large cap, international, etc.) and styles (e.g. growth, value, etc.). The Company has closed the plan to employees hired after March 31, 2006.

Benefits under the plan are based upon an employee’s years of service and career average compensation. The 2016 increase in the actuarial present value of each Named Executive Officer’s accumulated benefit under the plan is set forth in the Summary Compensation Table which appears on page 104 and the actuarial present value of each Named Executive Officer is set forth in the Pension Benefits Table which appears on page 105.

401(k) Plan:

Our executives are eligible to participate in the Company’s 401(k) contributory defined contribution plan. The Company contributes a matching contribution equal to 33.33% on the first 6% of the participant’s compensation that has been contributed to the plan. The Chief Executive Officer and five of the Named Executive Officers participated in the 401(k) plan during fiscal 2016 and received matching contributions up to a maximum of $5,300. The plan is currently administered by SBERA.

Supplemental Executive Insurance/Retirement Income Plan:

The Company has a Supplemental Executive Insurance/Retirement Plan (the Supplemental Plan) which is limited to select officers and employees of the Company.

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Executive officers of the Company or its subsidiaries who have at least one year of service may participate in the Supplemental Plan. The Supplemental Plan is voluntary and participants are required to contribute to its cost. Under the Supplemental Plan, each participant will receive a retirement benefit based on compensation and length of service. Individual life insurance policies, which are owned by the Company, are purchased covering the lives of each participant.

Benefits under the Supplemental Plan are based upon an employee’s years of service and highest three year average compensation. The 2016 increase in the actuarial present value of each Named Executive Officer’s accumulated benefit under the Supplemental Plan is set forth in the Summary Compensation Table which appears below and the actuarial present value of each Named Executive Officer is set forth in the Supplemental Executive Insurance/Retirement Benefits Table which appears on page 106.

Previously, the Company has entered into an agreement with Mr. Marshall Sloane to freeze his Supplemental Executive/Insurance Retirement Income Plan benefit. In consideration of this frozen benefit, the Company has acquired life insurance policies providing a death benefit of $25,000,000 upon the death of the survivor of Mr. Sloane or Mrs. Sloane. Mr. Sloane has elected 50% joint and survivor annuity. Under this plan he received $523,639 in 2016.

Chief Executive Officer Compensation

The Company granted Chief Executive Officer, Barry R. Sloane, a 3% salary increase in 2016. In recognition of the Company’s solid financial performance in 2016, the Company also granted a $200,000 cash bonus payable to Mr. Barry R. Sloane. Total compensation granted to the Chief Executive Officer for 2016 is described in the Summary Compensation Table in the statement.

Executive Officer Compensation

Consistent with the decisions regarding CEO base compensation, the Company determined that the base salary compensation for each of the following Named Executive Officers, Linda Sloane Kay, Paul Evangelista, and David Woonton was increased 3% in 2016. The base salary for William Hornby and Brian Feeney was increased 5.6% in 2016 based on market data. In light of the Company’s financial performance in 2016, cash bonuses were awarded to all of the above Named Executive Officers as noted in the Summary Compensation Table.

The Company based its determinations on its subjective analysis of each individual’s performance and contribution to the corporation’s goals and objectives and considered the quantitative and qualitative factors referenced above.

Executive Benefits

We limit additional executive benefits that we make available to our executive officers. Where such benefits are provided, they are intended to support other business purposes including facilitating business development efforts.

Consulting Services Agreement

The Company renewed its consulting agreement with Marshall M. Sloane to provide the Company advice on strategic planning and operational management, assist with business development efforts and clients, participate in public relations and community outreach efforts and provides other services as may be requested by the Board of Directors. The Company agreed to pay Mr. Sloane an annual contract fee of $386,096 per year during 2016 with provisions to reimburse Mr. Sloane for all related business expenses and the expense of obtaining health insurance comparable to that which the Company provided while he was Chief Executive Officer. In recognition of the Company’s financial performance, the Company also awarded Mr. Sloane a special Director’s bonus for 2016 as noted on the Summary Compensation Table.

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Employment Agreement

The Company has entered into an employment agreement with Mr. David Woonton. The agreement grants two years of service payable upon a change of control of the Company.

Compensation Committee Report

The Compensation Committee has reviewed and discussed the foregoing Report of the Compensation Committee, including the CD&A, with management. In reliance on the reviews and discussions referred to above, the Compensation Committee recommended to the Board, and the Board has approved, that the CD&A be included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2016 for filing with the SEC.

/s/ Fraser Lemley, Chairman

/s/ Joseph Mercurio

/s/ Jon Westling

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Compensation Paid to Executive Officers

The following table sets forth information for the three year period ended December 31, 2016 concerning the compensation for services in all capacities to Century Bancorp, Inc. and its subsidiaries of our principal executive officers and our principal financial officer as well as our other four most highly compensated executive officers (or executive officers of our subsidiaries). We refer to these individuals throughout this 10-K statement as the “Named Executive Officers”.

Summary Compensation Table

Name and Principal Position	Year		Salary ($)		Bonus ($)		Stock Awards ($)		Option Awards ($)		Change in Pension Value and Nonqualified Deferred Compensation Earnings- December 31, ($)		All Other Compensation ($) (1)		Total ($)
Marshall M. Sloane(2)		2016		—		—		—		—		—		1,124,822		1,124,822
Chairman of the Board,		2015		—		—		—		—		542,344		1,020,928		1,563,272
Century Bancorp, Inc. and		2014		—		—		—		—		321,375		961,896		1,283,271
Century Bank and Trust Company
Barry R. Sloane		2016		621,174		200,000		—		—		1,098,238		55,122		1,974,534
President and CEO, Century		2015		603,081		132,120		—		—		1,528,901		61,409		2,325,511
Bancorp, Inc. and Century Bank		2014		569,207		165,150		—		—		1,657,205		56,423		2,447,985
and Trust Company
David B. Woonton		2016		368,437		66,613		—		—		284,037		10,771		729,858
Executive Vice President,		2015		357,706		62,842		—		—		607,906		16,221		1,044,675
Century Bank and Trust Company		2014		337,614		78,552		—		—		1,062,188		33,503		1,511,857
Paul A. Evangelista		2016		368,437		66,613		—		—		225,130		9,279		669,459
Executive Vice President,		2015		357,706		62,842		—		—		422,371		12,750		855,669
Century Bank and Trust Company		2014		337,614		78,552		—		—		908,094		26,015		1,350,275
Linda Sloane Kay		2016		368,437		85,000		—		—		430,658		22,481		906,576
Executive Vice President		2015		357,706		62,842		—		—		410,910		21,506		852,964
Century Bank and Trust Company		2014		294,708		68,733		—		—		459,929		16,838		840,208
Brian J. Feeney		2016		335,012		64,988		—		—		361,405		17,047		778,452
Executive Vice President,		2015		317,246		54,986		—		—		391,958		18,512		782,702
Century Bank and Trust Company		2014		294,708		68,733		—		—		516,380		16,345		896,166
William P. Hornby		2016		335,000		65,000		—		—		265,483		15,398		680,881
Chief Financial Officer and		2015		317,246		54,986		—		—		273,718		15,688		661,638
Treasurer, Century Bancorp, Inc.		2014		294,708		68,733		—		—		275,237		12,775		651,453
and Century Bank and
Trust Company

(1) The amount listed in all other compensation includes amounts attributable to term insurance premiums paid for the Supplemental Executive Insurance/Retirement Plan, matching contribution for the 401(k) plan, excess group life insurance premiums and long-term disability premiums and, as applicable, country club membership dues and taxable expense reimbursements.

(2) This amount, for 2016, includes $386,096 for consulting services, $533,670 amounts attributable to term insurance premiums for the Supplemental Executive Insurance/Retirement Plan, $36,725 for Director fees, $140,047 for bonus, as well as country club membership dues, health insurance premiums and Medicare reimbursements.

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Pension Benefits

The following table sets forth information concerning plans that provide for payments or other benefits at, following, or in connection with, retirement for each Named Executive Officer.

PENSION BENEFITS TABLE

Name	Plan Name	Number of Years Credited Service (#)		Present Value of Accumulated Benefit 12/31/2016 ($)(1)		Payments During Last Fiscal Year 12/31/2016 ($)
Marshall M. Sloane	Defined Benefit		33		555,035		94,261
Chairman of the Board	Pension Plan
Barry R. Sloane	Defined Benefit		13		288,189		—
President and CEO	Pension Plan
David B. Woonton	Defined Benefit		17		722,009		—
Executive Vice President,	Pension Plan
Century Bank and Trust Company
Paul A. Evangelista	Defined Benefit		17		536,955		—
Executive Vice President,	Pension Plan
Century Bank and Trust Company
Linda Sloane Kay	Defined Benefit		16		333,196		—
Executive Vice President	Pension Plan
Century Bank and Trust Company
Brian J. Feeney	Defined Benefit		27		600,747		—
Executive Vice President,	Pension Plan
Century Bank and Trust Company
William P. Hornby(2)	Defined Benefit		—		—		—
Chief Financial Officer and Treasurer	Pension Plan

(1) The present value of accumulated benefits was calculated with the assumption that retirement occurs at age 65. The benefit is calculated using an interest rate of 3.99% and the mortality table used is the RP 2014 adjusted to 2006 White Collar Mortality Table with projection MP 2016.

(2) Not a member of the Defined Benefit Pension Plan.

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SUPPLEMENTAL EXECUTIVE INSURANCE/RETIREMENT BENEFITS

Name	Plan Name	Number of Years Credited Service (#)		Present Value of Accumulated Benefit- 12/31/2016 ($)(1)		Payments During Last Fiscal Year- 12/31/2016 ($)
Marshall M. Sloane(2)	Supplemental Executive		33		2,881,104		523,639
Chairman of the Board	Insurance/Retirement Plan
Barry R. Sloane(2)	Supplemental Executive		15		7,637,525		—
President and CEO	Insurance/Retirement Plan
David B. Woonton(2)	Supplemental Executive		17		3,892,641		—
Executive Vice President,	Insurance/Retirement Plan
Century Bank and Trust Company
Paul A. Evangelista(2)	Supplemental Executive		17		2,758,415		—
Executive Vice President,	Insurance/Retirement Plan
Century Bank and Trust Company
Linda Sloane Kay(2)	Supplemental Executive		8		1,475,829		—
Executive Vice President,	Insurance/Retirement Plan
Century Bank and Trust Company
Brian J. Feeney(2)	Supplemental Executive		9		1,432,861		—
Executive Vice President,	Insurance/Retirement Plan
Century Bank and Trust Company
William P. Hornby(2)	Supplemental Executive		8		1,099,685		—
Chief Financial Officer and Treasurer	Insurance/Retirement Plan

(1) The present value of accumulated benefits was calculated with the assumption that retirement occurs at age 65. The benefit is calculated using an interest rate of 3.85% and the mortality table used is RP 2014 adjusted to 2006 White Collar Mortality Table with projection MP 2016.

(2) As of January 1, 2016, Messrs. Marshall M. Sloane, Barry R. Sloane, Paul A. Evangelista, David B. Woonton, Brian J. Feeney, Linda Sloane Kay and William P. Hornby were 100%, 92.5%, 100%, 100%, 55%, 47.5% and 47.5% vested, respectively, under the Supplemental Executive Insurance/Retirement Plan.

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Director Compensation

Directors not employed by the Company receive a $16,750 retainer per year, $325 per Company Board meeting attended, $850 per Bank Board meeting attended and $750 per committee meeting attended. Joseph Senna receives $2,200 per Audit Committee meeting as Chairman of the Audit Committee.

DIRECTOR COMPENSATION TABLE 2016

Name	Fees Earned or Paid in Cash ($)		All Other Compensation ($)		Total ($)
George R. Baldwin		39,500		—		39,500
Stephen R. Delinsky		33,825		—		33,825
Louis Grossman		36,500		—		36,500
Russell B. Higley		35,000		—		35,000
Jackie Jenkins-Scott		36,950		—		36,950
Linda Sloane Kay		—		—		—
Fraser Lemley		40,900		—		40,900
Joseph P. Mercurio		43,800		—		43,800
Joseph J. Senna		48,250		—		48,250
Jo Ann Simons		31,150		—		31,150
Barry R. Sloane		—		—		—
Marshall M. Sloane(1)		—		—		—
George F. Swansburg(2)		42,500		14,500		57,000
Jon Westling		29,450		—		29,450

(1) Amounts paid are listed in the Summary Compensation Table.

(2) The amount listed in all other compensation is for serving as Administrator of Century Bancorp Capital Trust II.

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

The following table sets forth certain information as to the number and percentage of shares of Class A and Class B Common Stock beneficially owned as of December 31, 2016, (i) by each person known by the Company to own beneficially more than 5% of the Company’s outstanding shares of Class A or Class B Common Stock, (ii) by each of the Company’s directors and executive officers; and (iii) by all directors and executive officers as a group. As of December 31, 2016, there were 3,600,729 shares of Class A Common Stock and 1,967,180 shares of Class B Common Stock outstanding.

Name and Address of Beneficial Owner	Class A Owned			% A Owned			Class B Owned			% B Owned
James J. Filler(8)		545,482			15.15	%
2964 Shook Hill Parkway, Birmingham, AL 35223
Maltese Capital Management, LLC(7)		281,040			7.81	%
150 East 52nd Street, 30th Floor, New York, NY 10022
Wellington Management Group, LLP(5)		190,308			5.29	%
280 Congress Street, Boston, MA 02210
Marshall M. Sloane(a)		31,617	(1)		0.88	%		1,721,841	(2)		87.53	%
400 Mystic Avenue, Medford, MA 02155
George R. Baldwin(a)		5,819			0.16	%
Stephen R. Delinsky(a)		2,981	(6)		0.08	%
Paul A. Evangelista(b)		7,643			0.21	%
Brian J. Feeney(b)		1,915			0.05	%
Louis Grossman(a)		100			0.00	%
Russell B. Higley, Esquire(a)		4,602			0.13	%
William P. Hornby(b)		500			0.01	%
Jackie Jenkins-Scott(a)		40			0.00	%
Linda Sloane Kay(a)(b)		10,902	(3)		0.66	%		60,000			3.05	%
Fraser Lemley(a)		23,764			0.66	%
Joseph P. Mercurio(a)		100			0.00	%
Joseph J. Senna(a)		25,001			0.69	%
Jo Ann Simons		100			0.00	%
Barry R. Sloane(a)(b)		4,678	(4)		0.13	%
George F. Swansburg(a)		32,251			0.90	%
Jon Westling(a)		8,785			0.24	%
David B. Woonton(b)		800			0.02	%
All directors and officers as a group (18 in number)		161,598			4.49	%		1,781,841			90.58	%

(a) Denotes director of the Company.

(b) Denotes officer of the Company or one of its subsidiaries.

(1) Includes 2,500 shares owned by Mr. Sloane’s spouse and also includes 16,899 shares held in trust for Mr. Sloane’s grandchildren.

(2) Includes 1,500 shares owned by Mr. Sloane’s spouse, 1,694,580 shares held by Sloane Family Enterprises LP, and does not include 94,239 shares owned by Mr. Sloane’s children. Mr. Sloane disclaims beneficial ownership of such 94,239 shares and 1,694,580 shares held by Sloane Family Enterprises LP.

(3) Includes 10,062 shares owned by Ms. Kay’s spouse.

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(4) Includes 40 shares owned by Mr. Barry Sloane’s children and 72 shares owned by Mr. Barry Sloane’s spouse. Includes 3,111 shares pledged.

(5) The Company has relied upon the information set forth in the Form 13F filed with the SEC by the Wellington Management Group, LLP on February 14, 2017.

(6) Includes 255 shares owned by Mr. Delinsky’s children.

(7) The Company has relied upon the information set forth in the Form 13F filed with the SEC by the Maltese Capital Management, LLC on February 13, 2017.

(8) The Company has relied upon the information set forth in the Form 4 filed with the SEC by James J. Filler on December 30, 2016.

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

Certain Directors and Officers of the Company and Bank and members of their immediate family are at present, as in the past, customers of the Bank and have transactions with the Bank in the ordinary course of business. In addition, certain of the Directors are at present, as in the past, also Directors, Officers or Stockholders of corporations or members of partnerships that are customers of the Bank and have transactions with the Bank in the ordinary course of business. Such transactions with Directors and Officers of the Company and the Bank and their families and with such corporations and partnerships were made in the ordinary course of business, were made on substantially the same terms, including interest rates and collateral on loans, as those prevailing at the time for comparable transactions with other persons, and did not involve more than the normal risk of collectibility or present other features unfavorable to the Bank. The Directors annually approve amounts to be paid to related parties for services rendered. The Company reviews related party transactions monthly.

NASDAQ Stock Market (“NASDAQ”) rules, and our governance principles, require that at least a majority of our Board be composed of “independent” directors. All of our directors other than Marshall M. Sloane, Barry R. Sloane, Linda Sloane Kay, George F. Swansburg and Russell B. Higley, Esq. are “independent” within the meaning of both the NASDAQ rules and our own corporate governance principles. Nine of our fourteen directors, therefore, are currently “independent” directors.

ITEM 14. PRINCIPAL ACCOUNTING FEES AND SERVICES

The Audit Committee separately pre-approves each of the following services, in compliance with the requirements of the Sarbanes-Oxley Act and SEC regulations, before they are rendered by the auditor: financial statement audit, attestation, preparation of tax returns and audit of 401(k) and pension plans. The Audit Committee’s pre-approval procedures, in compliance with the requirements of the Sarbanes-Oxley Act and SEC regulations, allow the Company’s auditors to perform certain services without specific permission from the Audit Committee, as long as these services comply with the following requirements: (a) the services consist of special projects relating to strategic tax savings initiatives, corporate tax structure engagements or merger and acquisition consulting; (b) aggregate special project services cannot exceed $50,000 during the calendar year; and (c) the Audit Committee must be informed about each service at its next scheduled meeting. All other services provided by the Company’s auditor must be separately pre-approved before they are rendered.

Description of Fees	Fiscal 2016 Amount		Fiscal 2015 Amount
Audit fees(1)	$	475,000	$	450,000
Audit-related fees		—		—
Tax fees(2)		49,000		52,900
Other fees		—		—
	$	524,000	$	502,900

(1) includes fees for annual audit, renewal of quarterly financial statement, internal control attestations.

(2) includes fees for tax compliance and tax consulting.

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PART IV

ITEM 15. EXHIBITS AND FINANCIAL STATEMENT SCHEDULES

(a)(1) Financial Statements.

The following financial statements of the company and its subsidiaries are presented in Item 8:

Report of Independent Registered Public Accounting Firm

Consolidated Balance Sheets — December 31, 2016 and 2015

Consolidated Statements of Income — Years Ended December 31, 2016, 2015 and 2014

Consolidated Statements of Changes in Stockholders’ Equity-Years ended December 31, 2016, 2015 and 2014

Consolidated Statements of Cash Flows-Years Ended December 31, 2016, 2015, and 2014

Notes to Consolidated Financial Statements

(2) Financial Statement Schedules

All schedules are omitted because either the required information is shown in the financial statements or notes incorporated by reference, or they are not applicable, or the data is not significant.

(3) Exhibits

3.1	Certificate of Incorporation of Century Bancorp, Inc., incorporated by reference previously filed with registrant’s initial registration statement on Form S-1 dated May 20, 1987 (Registration No. 33-13281).
3.2	Bylaws of Century Bancorp, Inc., Amended October 9, 2007, incorporated by reference previously filed with the September 30, 2007 10-Q.
3.3	Articles of Amendment of Century Bancorp, Inc. Articles of Organization effective January 9, 2009, incorporated by reference previously filed with an 8-K filed on April 29, 2009.
4.1	Form of Common Stock Certificate of the Company, incorporated by reference previously filed with registrant’s initial registration statement on Form S-1 dated May 20, 1987 (Registration No. 33-13281).
4.2	Century Bancorp, Inc. 401(K) Plan, incorporated by reference previously filed with the registrant’s Form S-8 filed on June 25, 1997.
4.3	Registration Statement relating to the 8.30% Junior Subordinated Debentures issued by Century Bancorp Capital Trust, incorporated by reference previously filed with the registrant’s Form S-2 filed on April 23, 1998.
10.1	2000 Stock Option Plan, as amended on December 30, 2005, incorporated by reference previously filed with the registrant’s Annual Report on Form 10-K filed on March 16, 2006.
10.2	Supplemental Executive Retirement Benefit with Marshall M. Sloane, incorporated by reference previously filed with the registrant’s Annual Report on Form 10-K filed on March 26, 2003.
10.3	Supplemental Executive Retirement and Insurance Plan, as amended on December 1, 2008, incorporated by reference previously filed with an 8-K filed on January 21, 2009.
10.4	2004 Stock Option Plan, as amended on December 30, 2005, incorporated by reference previously filed with the registrant’s Annual Report on Form 10-K filed on March 16, 2006.
10.5	Supplemental Executive Retirement and Insurance plan, as amended on July 14, 2009, incorporated by reference previously filed with an 8-K filed on July 16, 2009.
10.6	Century Bancorp Capital Trust II Purchase Agreement dated November 30, 2004, between Century Bancorp Capital Trust II and the Company and Sandler O’Neill Partners, L.P., First Tennessee Bank National Association and Keefe, Bruyette and Woods, Inc., incorporated by reference previously filed with the registrant’s Annual Report on Form 10-K filed on March 15, 2005.
10.7	Century Bancorp Capital Trust II Indenture, dated December 2, 2004, between the Company and Wilmington Trust Company, incorporated by reference previously filed with the registrant’s Annual Report on Form 10-K filed on March 15, 2005.

109

10.8	Century Bancorp Capital Trust II Amended and Restated Declaration of Trust, dated December 2, 2004, between the Trustees of Century Bancorp Capital Trust II, the Administrator, the Company and Sponsors, incorporated by reference previously filed with the registrant’s Annual Report on Form 10-K filed on March 15, 2005.
10.9	Century Bancorp, Inc. Guarantee Agreement, dated December 2, 2004, between the Century Bancorp, Inc. and Wilmington Trust Company, incorporated by reference previously filed with the registrant’s Annual Report on Form 10-K filed on March 15, 2005.
10.10	Consulting Services Agreement among Century Bancorp, Inc., Century Bank and Trust Company and Marshall M. Sloane dated as of April 14, 2006, incorporated by reference previously filed with an 8-K filed on April 17, 2006.
10.11	Purchase and Sale Agreement, dated as of August 14, 2007, with C&S Capital Properties, LLC, incorporated by reference previously filed with an 8-K filed on August 17, 2007.
10.12	Commercial Lease, dated as of August 14, 2007, with C&S Capital Properties, LLC, incorporated by reference previously filed with an 8-K filed on August 17, 2007.
10.13	Severance agreement among Century Bancorp, Inc., Century Bank and Trust Company and Jonathan G. Sloane dated April 30, 2010 incorporated by reference previously filed with an 8-K on May 14, 2010.
14	Code of ethics, incorporated by reference previously filed with the registrant’s Annual Report on Form 10-K filed on March 9, 2016.
21	Subsidiaries of the Registrant.
23.1	Consent of Independent Registered Public Accounting Firm.
31.1	Certification of Chief Executive Officer of the Company Pursuant to Securities Exchange Act Rules 13a-14 and 15d-14.
31.2	Certification of Chief Financial Officer of the Company Pursuant to Securities Exchange Act Rules 13a-14 and 15d-14.
32.1 +	Certification of Chief 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 Chief 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.
101.CAL*	XBRL Taxonomy Extension Calculation Linkbase.
101.LAB*	XBRL Taxonomy Extension Label Linkbase.
101.PRE*	XBRL Taxonomy Extension Presentation Linkbase.
101.DEF*	XBRL Taxonomy Definition Linkbase.

+ This exhibit shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, or otherwise subject to the liability of that section, and shall not be deemed to be incorporated by reference into any filing under the Securities Act of 1933 or the Securities Exchange Act of 1934.

* As provided in Rule 406T of Regulation S-T, this information is filed for purposes of Sections 11 and 12 of the Securities Act of 1933 and Section 18 of the Securities Exchange Act of 1934.

(b) Exhibits required by Item 601 of Regulation S-K.

See (a)(3) above for exhibits filed herewith.

(c) Financial Statement required by Regulation S-X.

Schedules to Consolidated Financial Statements required by Regulation S-X are not required under the related instructions or are inapplicable, and therefore have been omitted.

ITEM 16. FORM 10-K SUMMARY

Not applicable.

110

SIGNATURES

Pursuant to the requirements of Section 13 or 15 (d) of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized, on this 14th day of March, 2017.

Century Bancorp, Inc.
By:	/s/ Marshall M. Sloane
	Marshall M. Sloane, Chairman

Pursuant to the requirements of the Securities Exchange Act of 1934, this report has been signed below by the following persons on behalf of the registrant and in the capacities indicated and on the date indicated.

/s/ George R. Baldwin	/s/ Joseph Senna
George R. Baldwin, Director	Joseph Senna, Director
/s/ Stephen R. Delinsky	/s/ Jo Ann Simons
Stephen R. Delinsky, Director	Jo Ann Simons, Director
/s/ Louis J. Grossman	/s/ George F. Swansburg
Louis J. Grossman, Director	George F. Swansburg, Director
/s/ Russell B. Higley	/s/ Jon Westling
Russell B. Higley, Esquire, Director	Jon Westling, Director
/s/ Jackie Jenkins-Scott	/s/ Marshall M. Sloane
Jackie Jenkins-Scott, Director	Marshall M. Sloane, Chairman
/s/ Linda Sloane Kay	/s/ Barry R. Sloane
Linda Sloane Kay, Director	Barry R. Sloane, Director,
Executive Vice President, Century Bank and	President and Chief Executive Officer
Trust Company
/s/ Fraser Lemley	/s/ William P. Hornby
Fraser Lemley, Director	William P. Hornby, CPA, Chief Financial
	Officer and Treasurer
/s/ Joseph P. Mercurio	/s/ Anthony C. LaRosa
Joseph P. Mercurio, Director	Anthony C. LaRosa, CPA, Senior Vice President,
	Century Bank and Trust Company,
	Principal Accounting Officer

111

EX-21

Exhibit 21

Subsidiaries of the Registrant:

1) Century Bank and Trust Company

2) Century Bancorp Capital Trust II

EX-23.1

Exhibit 23.1

	KPMG LLP Two Financial Center 60 South Street Boston, MA 02111

Consent of Independent Registered Public Accounting Firm

The Board of Directors

Century Bancorp, Inc.:

We consent to the incorporation by reference in the registration statements (Nos. 333-118208, 333-58196, and 333-29987) on Form S-8 of Century Bancorp, Inc. of our reports dated March 15, 2017, with respect to the consolidated balance sheets of Century Bancorp, Inc. as of December 31, 2016 and 2015, and the related consolidated statements of income, comprehensive income, changes in stockholders’ equity, and cash flows for each of the years in the three-year period ended December 31, 2016, and the effectiveness of internal control over financial reporting as of December 31, 2016, which reports appear in the December 31, 2016 annual report on Form 10-K of Century Bancorp, Inc.

/s/ KPMG

Boston, Massachusetts

March 15, 2017

EX-31.1

Exhibit 31.1

I, Barry R. Sloane, certify that:

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

2. Based on my knowledge, this annual 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 annual report;

3. Based on my knowledge, the financial statements, and other financial information included in this annual report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the period presented in this annual 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 annual 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 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, to the registrant’s auditors and the audit committee of registrant’s board of directors;

(a) all significant deficiencies and material weaknesses in the design or operation of internal controls 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 controls over financial reporting.

Date: March 15, 2017	/s/ Barry R. Sloane
	Barry R. Sloane
	President and Chief Executive Officer
	(Principal Executive Officer)

EX-31.2

Exhibit 31.2

I, William P. Hornby, certify that:

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

2. Based on my knowledge, this annual 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 annual report;

3. Based on my knowledge, the financial statements, and other financial information included in this annual report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the period presented in this annual 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 we 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 annual 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 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, to the registrant’s auditors and the audit committee of registrant’s board of directors;

(a) all significant deficiencies and material weaknesses in the design or operation of internal controls 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 controls over financial reporting.

Date: March 15, 2017	/s/ William P. Hornby
	William P. Hornby
	Chief Financial Officer and Treasurer
	(Principal Financial 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 Annual Report on Form 10-K of Century Bancorp, Inc. (the “Company”) for the year ended December 31, 2016, as filed with the Securities and Exchange Commission, the undersigned, certifies, to the best knowledge and belief of the signatory, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that:

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

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

/s/ Barry R. Sloane

Barry R. Sloane

President and Chief Executive Officer

Date: March 15, 2017

A signed original of this written statement required by Section 906 of the Sarbanes-Oxley Act of 2002 or other document authenticating, acknowledging or otherwise adopting the signature that appears in typed form within the electronic version of this written statement required by Section 906 of the Sarbanes-Oxley Act of 2002 has been provided to the Company and will be retained by the Company and furnished to the Securities and Exchange Commission or its staff upon request.

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 Annual Report on Form 10-K of Century Bancorp, Inc. (the “Company”) for the year ended December 31, 2016, as filed with the Securities and Exchange Commission, the undersigned, certifies, to the best knowledge and belief of the signatory, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that:

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

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

/s/ William P. Hornby

William P. Hornby

Chief Financial Officer and Treasurer

Date: March 15, 2017

A signed original of this written statement required by Section 906 of the Sarbanes-Oxley Act of 2002 or other document authenticating, acknowledging or otherwise adopting the signature that appears in typed form within the electronic version of this written statement required by Section 906 of the Sarbanes-Oxley Act of 2002 has been provided to the Company and will be retained by the Company and furnished to the Securities and Exchange Commission or its staff upon request.

XML

Document and Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2016	Feb. 28, 2017	Jun. 30, 2016
Document Information [Line Items]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Dec. 31, 2016
Document Fiscal Year Focus	2016
Document Fiscal Period Focus	FY
Trading Symbol	CNBKA
Entity Registrant Name	CENTURY BANCORP INC
Entity Central Index Key	0000812348
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	No
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Filer Category	Accelerated Filer
Entity Public Float			$ 153,423,815
Class A Common Stock [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		3,600,729
Class B Common Stock [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		1,967,180

XML

Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
ASSETS
Cash and due from banks (Note 2)	$ 62,400	$ 52,877
Federal funds sold and interest-bearing deposits in other banks	173,751	167,847
Total cash and cash equivalents	236,151	220,724
Short-term investments	3,183	3,233
Securities available-for-sale, amortized cost $500,220 in 2016 and $404,977 in 2015 (Notes 3, 9 and 11)	499,297	404,623
Securities held-to-maturity, fair value $1,635,808 in 2016 and $1,438,960 in 2015 (Notes 4 and 11)	1,653,986	1,438,903
Federal Home Loan Bank of Boston, stock at cost	21,042	28,807
Loans, net (Note 5)	1,923,933	1,731,536
Less: allowance for loan losses (Note 6)	24,406	23,075
Net loans	1,899,527	1,708,461
Bank premises and equipment (Note 7)	23,417	24,106
Accrued interest receivable	9,645	8,002
Other assets (Notes 5, 8 and 16)	116,360	110,582
Total assets	4,462,608	3,947,441
LIABILITIES AND STOCKHOLDERS' EQUITY
Demand deposits	689,286	541,955
Savings and NOW deposits	1,304,394	1,070,585
Money market accounts	1,181,179	989,094
Time deposits (Note 10)	478,359	473,426
Total deposits	3,653,218	3,075,060
Securities sold under agreements to repurchase (Note 11)	182,280	197,850
Other borrowed funds (Note 12)	293,000	368,000
Subordinated debentures (Note 12)	36,083	36,083
Other liabilities	57,986	55,904
Total liabilities	4,222,567	3,732,897
Commitments and contingencies (Notes 7, 18 and 19)
Stockholders' equity (Note 15):
Preferred Stock - $1.00 par value; 100,000 shares authorized; no shares issued and outstanding
Additional paid-in capital	12,292	12,292
Retained earnings	243,565	221,232
Stockholders' equity before adjustment of accumulated other comprehensive income (loss)	261,425	239,092
Unrealized losses on securities available-for-sale, net of taxes	(567)	(246)
Unrealized losses on securities transferred to held-to-maturity, net of taxes	(4,084)	(6,896)
Pension liability, net of taxes	(16,733)	(17,406)
Total accumulated other comprehensive loss, net of taxes (Notes 3, 13 and 15)	(21,384)	(24,548)
Total stockholders' equity	240,041	214,544
Total liabilities and stockholders' equity	4,462,608	3,947,441
Class A Common Stock [Member]
Stockholders' equity (Note 15):
Common stock value	3,601	3,601
Total stockholders' equity	3,601	3,601
Class B Common Stock [Member]
Stockholders' equity (Note 15):
Common stock value	1,967	1,967
Total stockholders' equity	$ 1,967	$ 1,967

XML

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Amortized cost	$ 500,220	$ 404,977
Held-to-maturity securities, fair value	$ 1,635,808	$ 1,438,960
Preferred stock, par value	$ 1.00	$ 1.00
Preferred stock, shares authorized	100,000	100,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Class A Common Stock [Member]
Common stock, par value	$ 1.00	$ 1.00
Common stock, shares authorized	10,000,000	10,000,000
Common stock, shares issued	3,600,729	3,600,729
Class B Common Stock [Member]
Common stock, par value	$ 1.00	$ 1.00
Common stock, shares authorized	5,000,000	5,000,000
Common stock, shares issued	1,967,180	1,967,180

XML

Consolidated Statements of Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
INTEREST INCOME
Loans, taxable	$ 34,324	$ 32,136	$ 32,198
Loans, non-taxable	23,440	19,992	17,910
Securities available-for-sale, taxable	3,003	1,900	2,601
Securities available-for-sale, non-taxable	1,051	583	282
Federal Home Loan Bank of Boston dividends	966	658	283
Securities held-to-maturity	32,679	34,388	31,745
Federal funds sold, interest-bearing deposits in other banks and short-term investments	1,236	436	352
Total interest income	96,699	90,093	85,371
INTEREST EXPENSE
Savings and NOW deposits	4,020	2,817	2,539
Money market accounts	3,542	3,038	2,715
Time deposits	5,706	4,887	4,421
Securities sold under agreements to repurchase	472	487	391
Other borrowed funds and subordinated debentures	8,877	8,905	9,070
Total interest expense	22,617	20,134	19,136
Net interest income	74,082	69,959	66,235
Provision for loan losses (Note 6)	1,375	200	2,050
Net interest income after provision for loan losses	72,707	69,759	64,185
OTHER OPERATING INCOME
Service charges on deposit accounts	7,907	7,732	8,063
Lockbox fees	3,164	3,211	3,099
Brokerage commissions	315	380	302
Net gains on sales of securities	64	594	450
Gains on sales of mortgage loans	1,331	1,034	757
Other income	3,441	3,042	2,600
Total other operating income	16,222	15,993	15,271
OPERATING EXPENSES
Salaries and employee benefits (Note 17)	40,048	38,596	35,096
Occupancy	6,147	6,116	5,503
Equipment	2,845	2,626	2,329
FDIC assessments	1,902	2,152	1,970
Other (Note 20)	13,815	12,708	11,832
Total operating expenses	64,757	62,198	56,730
Income before income taxes	24,172	23,554	22,726
Provision for income taxes (Note 16)	(362)	533	866
Net income	24,534	23,021	21,860
Class A Common Stock [Member]
OPERATING EXPENSES
Net income	$ 19,270	$ 18,081	$ 17,157
SHARE DATA (Note 14)
Weighted average number of shares outstanding, basic	3,600,729	3,600,729	3,591,732
Weighted average number of shares outstanding, diluted	5,567,909	5,567,909	5,562,209
Basic earnings per share	$ 5.35	$ 5.02	$ 4.78
Diluted earnings per share	$ 4.41	$ 4.13	$ 3.93
Class B Common Stock [Member]
OPERATING EXPENSES
Net income	$ 5,264	$ 4,940	$ 4,703
SHARE DATA (Note 14)
Weighted average number of shares outstanding, basic	1,967,180	1,967,180	1,969,030
Weighted average number of shares outstanding, diluted	1,967,180	1,967,180	1,969,030
Basic earnings per share	$ 2.68	$ 2.51	$ 2.39
Diluted earnings per share	$ 2.68	$ 2.51	$ 2.39

XML

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Statement of Comprehensive Income [Abstract]
Net income	$ 24,534	$ 23,021	$ 21,860
Unrealized gains (losses) on securities:
Unrealized holding gains (losses) arising during period	(289)	38	1,401
Less: reclassification adjustment for gains included in net income	(32)	(361)	(279)
Total unrealized gains (losses) on securities	(321)	(323)	1,122
Accretion of net unrealized losses transferred during period	2,812	3,583	3,188
Pension liability adjustment:
Net (loss) gain	(297)	(2,890)	(8,544)
Amortization of prior service cost and loss included in net periodic benefit cost	970	853	226
Total pension liability adjustment	673	(2,037)	(8,318)
Other comprehensive (loss) income	3,164	1,223	(4,008)
Comprehensive income (loss)	$ 27,698	$ 24,244	$ 17,852

XML

Consolidated Statements of Changes in Stockholders' Equity - USD ($) $ in Thousands	Total	Class A Common Stock [Member]	Class B Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Retained Earnings [Member] Class A Common Stock [Member]	Retained Earnings [Member] Class B Common Stock [Member]	Accumulated Other Comprehensive Loss [Member]
Beginning balance at Dec. 31, 2013	$ 176,472	$ 3,580	$ 1,976	$ 11,932	$ 180,747			$ (21,763)
Net income	21,860	17,157	4,703		21,860
Other comprehensive income, net of tax:
Unrealized holding gains arising during period, net of taxes	1,122							1,122
Accretion of net unrealized losses transferred during the period, net of taxes	3,188							3,188
Pension liability adjustment, net of taxes	(8,318)							(8,318)
Conversion of Class B Common Stock to Class A Common Stock		9
Conversion of Class B Common Stock to Class A Common Stock			(9)
Stock options exercised	361	12		349
Cashless stock options exercised	11			11
Cash dividends						$ (1,723)	$ (473)
Ending balance at Dec. 31, 2014	192,500	3,601	1,967	12,292	200,411			(25,771)
Net income	23,021	18,081	4,940		23,021
Other comprehensive income, net of tax:
Unrealized holding gains arising during period, net of taxes	(323)							(323)
Accretion of net unrealized losses transferred during the period, net of taxes	3,583							3,583
Pension liability adjustment, net of taxes	(2,037)							(2,037)
Cash dividends						(1,728)	(472)
Ending balance at Dec. 31, 2015	214,544	3,601	1,967	12,292	221,232			(24,548)
Net income	24,534	19,270	5,264		24,534
Other comprehensive income, net of tax:
Unrealized holding gains arising during period, net of taxes	(321)							(321)
Accretion of net unrealized losses transferred during the period, net of taxes	2,812							2,812
Pension liability adjustment, net of taxes	673							673
Cash dividends						$ (1,729)	$ (472)
Ending balance at Dec. 31, 2016	$ 240,041	$ 3,601	$ 1,967	$ 12,292	$ 243,565			$ (21,384)

XML

Consolidated Statements of Changes in Stockholders' Equity (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Unrealized holding gains arising during period, taxes	$ 248	$ 211	$ 756
Realized net gains	52	594	450
Accretion of net unrealized losses transferred during the period, taxes	1,505	1,919	2,004
Pension liability adjustment, taxes	$ 448	$ 1,357	$ 5,532
Stock options exercised, shares			11,325
Cashless stock options exercised, shares			7,700
Class A Common Stock [Member]
Conversion of Class B Common Stock to Class A Common Stock, shares			9,000
Cash dividends, per share	$ 0.48	$ 0.48	$ 0.48
Class B Common Stock [Member]
Conversion of Class B Common Stock to Class A Common Stock, shares			9,000
Cash dividends, per share	$ 0.24	$ 0.24	$ 0.24

XML

Consolidated Statements of Cash Flows - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 24,534,000	$ 23,021,000	$ 21,860,000
Adjustments to reconcile net income to net cash provided by operating activities:
Gain on sales of portfolio loans	(1,331,000)	(1,034,000)	(757,000)
Gain on sale of fixed assets			(5,000)
Net gains on sales of securities	(64,000)	(594,000)	(450,000)
Provision for loan losses	1,375,000	200,000	2,050,000
Deferred tax benefit	(4,676,000)	(3,259,000)	(3,613,000)
Net depreciation and amortization	3,561,000	3,296,000	2,937,000
(Increase) decrease in accrued interest receivable	(1,643,000)	(1,761,000)	298,000
Gain on sales of other real estate owned		(57,000)	(60,000)
Increase in other assets	(2,953,000)	(10,862,000)	(2,849,000)
Increase in other liabilities	3,203,000	2,103,000	2,976,000
Net cash provided by (used in) operating activities	22,006,000	11,053,000	22,387,000
CASH FLOWS FROM INVESTING ACTIVITIES:
Proceeds from maturities of short-term investments	3,233,000		4,617,000
Purchase of short-term investments	(3,183,000)	(1,102,000)	(2,131,000)
Proceeds from redemptions of Federal Home Loan Bank of Boston stock	10,381,000	891,000	680,000
Purchase of Federal Home Loan Bank of Boston stock	(2,616,000)	(4,782,000)	(7,524,000)
Proceeds from calls/maturities of securities available-for-sale	277,657,000	206,109,000	153,832,000
Proceeds from sales of securities available-for-sale	2,376,000	47,853,000	40,285,000
Purchase of securities available-for-sale	(375,608,000)	(210,302,000)	(176,224,000)
Proceeds from calls/maturities of securities held-to-maturity	416,599,000	414,786,000	267,486,000
Proceeds from sales of securities held-to-maturity	192,000	3,698,000	0
Purchase of securities held-to-maturity	(627,670,000)	(444,969,000)	(181,411,000)
Proceeds from sales of portfolio loans	74,668,000	66,600,000	44,501,000
Net increase in loans	(265,732,000)	(467,048,000)	(111,528,000)
Proceeds from sales of other real estate owned		1,973,000	615,000
Proceeds from sales of fixed assets			5,000
Capital expenditures	(2,263,000)	(2,652,000)	(3,104,000)
Net cash (used in) provided by investing activities	(491,966,000)	(388,945,000)	30,099,000
CASH FLOWS FROM FINANCING ACTIVITIES:
Net increase in time deposit accounts	4,933,000	90,281,000	921,000
Net increase in demand, savings, money market and NOW deposits	573,225,000	247,188,000	20,831,000
Net proceeds from the exercise of stock options			361,000
Cash dividends	(2,201,000)	(2,200,000)	(2,196,000)
Net decrease in securities sold under agreements to repurchase	(15,570,000)	(14,510,000)	(2,080,000)
Net (decrease) increase in other borrowed funds	(75,000,000)	(27,500,000)	140,356,000
Net cash provided by (used in) financing activities	485,387,000	293,259,000	158,193,000
Net increase (decrease) in cash and cash equivalents	15,427,000	(84,633,000)	210,679,000
Cash and cash equivalents at beginning of year	220,724,000	305,357,000	94,678,000
Cash and cash equivalents at end of year	236,151,000	220,724,000	305,357,000
Cash paid during the year for:
Interest	22,668,000	19,979,000	19,168,000
Income taxes	3,730,000	4,300,000	4,493,000
Change in unrealized losses on securities available-for-sale, net of taxes	(321,000)	(323,000)	1,122,000
Change in unrealized losses on securities transferred to held-to-maturity, net of taxes	2,812,000	3,583,000	3,188,000
Pension liability adjustment, net of taxes	$ 673,000	(2,037,000)	(8,318,000)
Transfer of loans to other real estate owned		$ 1,916,000	$ 555,000

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Summary of Significant Accounting Policies

12 Months Ended

Dec. 31, 2016

Accounting Policies [Abstract]

Summary of Significant Accounting Policies

1.    Summary of Significant Accounting Policies

BASIS OF FINANCIAL STATEMENT PRESENTATION

The consolidated financial statements include the accounts of Century Bancorp, Inc. (the “Company”) and its wholly owned subsidiary, Century Bank and Trust Company (the “Bank”). The consolidated financial statements also include the accounts of the Bank’s wholly owned subsidiaries, Century Subsidiary Investments, Inc. (“CSII”), Century Subsidiary Investments, Inc. II (“CSII II”), Century Subsidiary Investments, Inc. III (“CSII III”) and Century Financial Services Inc. (“CFSI”). CSII, CSII II, and CSII III are engaged in buying, selling and holding investment securities. CFSI has the power to engage in financial agency, securities brokerage, and investment and financial advisory services and related securities credit. The Company also owns 100% of Century Bancorp Capital Trust II (“CBCT II”). The entity is an unconsolidated subsidiary of the Company.

All significant intercompany accounts and transactions have been eliminated in consolidation. The Company provides a full range of banking services to individual, business and municipal customers in Massachusetts, New Hampshire, Rhode Island, Connecticut and New York. As a bank holding company, the Company is subject to the regulation and supervision of the Federal Reserve Board. The Bank, a state chartered financial institution, is subject to supervision and regulation by applicable state and federal banking agencies, including the Federal Reserve Board, the Federal Deposit Insurance Corporation (the “FDIC”) and the Commonwealth of Massachusetts Commissioner of Banks. The Bank is also subject to various requirements and restrictions under federal and state law, including requirements to maintain reserves against deposits, restrictions on the types and amounts of loans that may be granted and the interest that may be charged thereon, and limitations on the types of investments that may be made and the types of services that may be offered. Various consumer laws and regulations also affect the operations of the Bank. In addition to the impact of regulation, commercial banks are affected significantly by the actions of the Federal Reserve Board as it attempts to control the money supply and credit availability in order to influence the economy. All aspects of the Company’s business are highly competitive. The Company faces aggressive competition from other lending institutions and from numerous other providers of financial services. The Company has one reportable operating segment.

The financial statements have been prepared in conformity with accounting principles generally accepted in the United States of America and general practices within the banking industry. In preparing the financial statements, management is required to make estimates and assumptions that affect the reported amounts of assets and liabilities as of the date of the balance sheet and revenues and expenses for the period. Actual results could differ from those estimates.

Material estimates that are susceptible to change in the near term relate to the allowance for loan losses. Management believes that the allowance for loan losses is adequate based on a review of factors, including historical charge-off rates with additional allocations based on qualitative risk factors for each category and general economic factors. While management uses available information to recognize loan losses, future additions to the allowance for loan losses may be necessary based on changes in economic conditions. In addition, regulatory agencies periodically review the Company’s allowance for loan losses. Such agencies may require the Company to recognize additions to the allowance for loan losses based on their judgments about information available to them at the time of their examination. Certain reclassifications are made to prior-year amounts whenever necessary to conform with the current-year presentation.

FAIR VALUE MEASUREMENTS

The Company follows FASB ASC 820-10, Fair Value Measurements and Disclosures, which among other things, requires enhanced disclosures about assets and liabilities carried at fair value. ASC 820-10 establishes a hierarchal disclosure framework associated with the level of pricing observability utilized in measuring financial instruments at fair value. The three broad levels of the hierarchy are as follows:

Level I — Quoted prices are available in active markets for identical assets or liabilities as of the reported date. The type of financial instruments included in Level I are highly liquid cash instruments with quoted prices, such as G-7 government, agency securities, listed equities and money market securities, as well as listed derivative instruments.

Level II — Pricing inputs are other than quoted prices in active markets, which are either directly or indirectly observable as of the reported date. The nature of these financial instruments includes cash instruments for which quoted prices are available but traded less frequently, derivative instruments whose fair value has been derived using a model where inputs to the model are directly observable in the market or can be derived principally from or corroborated by observable market data, and instruments that are fair valued using other financial instruments, the parameters of which can be directly observed. Instruments that are generally included in this category are corporate bonds and loans, mortgage whole loans, municipal bonds and over the counter (“OTC”) derivatives.

Level III — These instruments have little to no pricing observability as of the reported date. These financial instruments do not have two-way markets and are measured using management’s best estimate of fair value, where the inputs into the determination of fair value require significant management judgment or estimation. Instruments that are included in this category generally include certain commercial mortgage loans, certain private equity investments, distressed debt, and noninvestment grade residual interests in securitizations as well as certain highly structured OTC derivative contracts.

CASH AND CASH EQUIVALENTS

For purposes of reporting cash flows, cash equivalents include highly liquid assets with an original maturity of three months or less. Highly liquid assets include cash and due from banks, federal funds sold and certificates of deposit.

SHORT-TERM INVESTMENTS

As of December 31, 2016 and 2015, short-term investments include highly liquid certificates of deposit with original maturities of more than 90 days but less than one year.

INVESTMENT SECURITIES

Debt securities that the Company has the positive intent and ability to hold to maturity are classified as held-to-maturity and reported at amortized cost; debt and equity securities that are bought and held principally for the purpose of selling are classified as trading and reported at fair value, with unrealized gains and losses included in earnings; and debt and equity securities not classified as either held-to-maturity or trading are classified as available-for-sale and reported at fair value, with unrealized gains and losses excluded from earnings and reported as a separate component of stockholders’ equity, net of estimated related income taxes. The Company has no securities held for trading.

Premiums and discounts on investment securities are amortized or accreted into income by use of the level-yield method. Gains and losses on the sale of investment securities are recognized on the trade date on a specific identification basis.

Management also considers the Company’s capital adequacy, interest-rate risk, liquidity and business plans in assessing whether it is more likely than not that the Company will sell or be required to sell the investment securities before recovery. If the Company determines that a decline in fair value is OTTI and that it is more likely than not that the Company will not sell or be required to sell the investment security before recovery of its amortized cost, the credit portion of the impairment loss is recognized in the Company’s consolidated statement of income and the noncredit portion is recognized in accumulated other comprehensive income. The credit portion of the OTTI impairment represents the difference between the amortized cost and the present value of the expected future cash flows of the investment security. If the Company determines that a decline in fair value is OTTI and it is more likely than not that it will sell or be required to sell the investment security before recovery of its amortized cost, the entire difference between the amortized cost and the fair value of the security will be recognized in the Company’s consolidated statement of income.

The transfer of a security between categories of investments shall be accounted for at fair value. For a debt security transferred into the held-to-maturity category from the available-for-sale category, the unrealized holding gain or loss at the date of the transfer shall continue to be reported in a separate component of shareholders’ equity but shall be amortized over the remaining life of the security as an adjustment of yield in a manner consistent with the amortization of any premium or discount. The amortization of an unrealized holding gain or loss reported in equity will offset or mitigate the effect on interest income of the amortization of the premium or discount for that held-to-maturity security.

The sale of a security held-to-maturity may occur after a substantial portion (at least 85%) of the principal outstanding at acquisition due either to prepayments on the debt security or to scheduled payments on a debt security payable in equal installments over its term. For variable rate securities, the scheduled payments need not be equal.

FEDERAL HOME LOAN BANK STOCK

The Bank, as a member of the Federal Home Loan Bank of Boston (“FHLBB”), is required to maintain an investment in capital stock of the FHLBB. Based on redemption provisions, the stock has no quoted market value and is carried at cost. At its discretion, the FHLBB may declare dividends on the stock. The Company reviews for impairment based on the ultimate recoverability of the cost basis of the stock. As of December 31, 2016, no impairment has been recognized.

LOANS HELD FOR SALE

Loans originated and intended for sale in the secondary market are carried at the lower of cost or estimated fair value in the aggregate. Net unrealized losses, if any, are recognized through a valuation allowance by charges to income.

LOANS

Interest on loans is recognized based on the daily principal amount outstanding. Accrual of interest is discontinued when loans become ninety days delinquent unless the collateral is sufficient to cover both principal and interest and the loan is in the process of collection. Past-due status is based on contractual terms of the loan. Loans, including impaired loans, on which the accrual of interest has been discontinued, are designated nonaccrual loans. When a loan is placed on nonaccrual, all income that has been accrued but remains unpaid is reversed against current period income, and all amortization of deferred loan costs and fees is discontinued. Nonaccrual loans may be returned to an accrual status when principal and interest payments are not delinquent or the risk characteristics of the loan have improved to the extent that there no longer exists a concern as to the collectibility of principal and interest. Income received on nonaccrual loans is either recorded in income or applied to the principal balance of the loan, depending on management’s evaluation as to the collectibility of principal.

Loan origination fees and related direct loan origination costs are offset, and the resulting net amount is deferred and amortized over the life of the related loans using the level-yield method. Prepayments are not initially considered when amortizing premiums and discounts.

The Bank measures impairment for impaired loans at either the fair value of the loan, the present value of the expected future cash flows discounted at the loan’s effective interest rate or the fair value of the collateral if the loan is collateral dependent. This method applies to all loans, uncollateralized as well as collateralized, except large groups of smaller-balance homogeneous loans such as residential real estate and consumer loans that are collectively evaluated for impairment and loans that are measured at fair value. For collateral dependent loans, the amount of the recorded investment in a loan that exceeds the fair value of the collateral is charged-off against the allowance for loan losses in lieu of an allocation of a specific allowance when such an amount has been identified definitively as uncollectible. Management considers the payment status, net worth and earnings potential of the borrower, and the value and cash flow of the collateral as factors to determine if a loan will be paid in accordance with its contractual terms. Management does not set any minimum delay of payments as a factor in reviewing for impaired classification. Loans are charged-off when management believes that the collectibility of the loan’s principal is not probable. The specific factors that management considers in making the determination that the collectibility of the loan’s principal is not probable include the delinquency status of the loan, the fair value of the collateral, if secured, and, the financial strength of the borrower and/or guarantors. In addition, criteria for classification of a loan as in-substance foreclosure has been modified so that such classification need be made only when a lender is in possession of the collateral. The Bank measures the impairment of troubled debt restructurings using the pre-modification effective rate of interest.

TRANSFERS OF FINANCIAL ASSETS

Transfers of financial assets, typically residential mortgages and loan participations for the Company, are accounted for as sales when control over the assets has been surrendered. Control over transferred assets is deemed to be surrendered when (1) the assets have been isolated from the Company, (2) the transferee obtains the right (free of conditions that constrain it from taking advantage of that right) to pledge or exchange the transferred assets, and (3) the Company does not maintain effective control over the transferred assets.

ACQUIRED LOANS

In accordance with FASB ASC 310-30, Loans and Debt Securities Acquired with Deteriorated Credit Quality (formerly Statement of Position (“SOP”) No. 03-3, “Accounting for Certain Loans or Debt Securities Acquired in a Transfer”) the Company reviews acquired loans for differences between contractual cash flows and cash flows expected to be collected from the Company’s initial investment in the acquired loans to determine if those differences are attributable, at least in part, to credit quality. If those differences are attributable to credit quality, the loan’s contractually required payments received in excess of the amount of its cash flows expected at acquisition, or nonaccretable discount, is not accreted into income. FASB ASC 310-30 requires that the Company recognize the excess of all cash flows expected at acquisition over the Company’s initial investment in the loan as interest income using the interest method over the term of the loan. This excess is referred to as accretable discount and is recorded as a reduction of the loan balance.

Loans which, at acquisition, do not have evidence of deterioration of credit quality since origination are outside the scope of FASB ASC 310-30. For such loans, the discount, if any, representing the excess of the amount of reasonably estimable and probable discounted future cash collections over the purchase price, is accreted into interest income using the interest method over the term of the loan. Prepayments are not considered in the calculation of accretion income. Additionally, the discount is not accreted on nonperforming loans.

When a loan is paid off, the excess of any cash received over the net investment is recorded as interest income. In addition to the amount of purchase discount that is recognized at that time, income may include interest owed by the borrower prior to the Company’s acquisition of the loan, interest collected if on nonperforming status, prepayment fees and other loan fees. There were no new loans acquired during the year ended December 31, 2016.

NONPERFORMING ASSETS

In addition to nonperforming loans, nonperforming assets include other real estate owned. Other real estate owned is comprised of properties acquired through foreclosure or acceptance of a deed in lieu of foreclosure. Other real estate owned is recorded initially at estimated fair value less costs to sell. When such assets are acquired, the excess of the loan balance over the estimated fair value of the asset is charged to the allowance for loan losses. An allowance for losses on other real estate owned is established by a charge to earnings when, upon periodic evaluation by management, further declines in the estimated fair value of properties have occurred. Such evaluations are based on an analysis of individual properties as well as a general assessment of current real estate market conditions. Holding costs and rental income on properties are included in current operations, while certain costs to improve such properties are capitalized. Gains and losses from the sale of other real estate owned are reflected in earnings when realized.

ALLOWANCE FOR LOAN LOSSES

The allowance for loan losses is based on management’s evaluation of the quality of the loan portfolio and is used to provide for losses resulting from loans that ultimately prove uncollectible. The components of the allowance for loan losses represent estimates based upon Accounting Standards Codification (“ASC”) Topic 450, contingencies, and ASC Topic 310 Receivables. ASC Topic 450 applies to homogenous loan pools such as consumer installment, residential mortgages, consumer lines of credit and commercial loans that are not individually evaluated for impairment under ASC Topic 310. In determining the level of the allowance, periodic evaluations are made of the loan portfolio, which takes into account factors such as the characteristics of the loans, loan status, financial strength of the borrowers, value of collateral securing the loans and other relevant information sufficient to reach an informed judgment. The allowance is increased by provisions charged to income and reduced by loan charge-offs, net of recoveries. Management maintains an allowance for loan losses to absorb losses inherent in the loan portfolio. The allowance is based on assessments of the probable estimated losses inherent in the loan portfolio. Management’s methodology for assessing the appropriateness of the allowance consists of several key elements, which include the specific allowances, if appropriate, for identified problem loans, formula allowance, and possibly an unallocated allowance. Arriving at an appropriate level of allowance for loan losses necessarily involves a high degree of judgment.

While management uses available information in establishing the allowance for loan losses, future adjustments to the allowance may be necessary if economic conditions differ substantially from the assumptions used in making the evaluations. Loans are charged-off in whole or in part when, in management’s opinion, collectibility is not probable. The specific factors that management considers in making the determination that the collectibility of the loan’s principal is not probable include the delinquency status of the loan, the fair value of the collateral and the financial strength of the borrower and/or guarantors.

Under ASC Topic 310, a loan is impaired, based upon current information and in management’s opinion, when it is probable that the loan will not be repaid according to its original contractual terms, including both principal and interest, or if a loan is designated as a TDR. Specific allowances for loan losses entail the assignment of allowance amounts to individual loans on the basis of loan impairment. Under this method, loans are selected for evaluation based upon a change in internal risk rating, occurrence of delinquency, loan classification or nonaccrual status. A specific allowance amount is allocated to an individual loan when such loan has been deemed impaired and when the amount of a probable loss is able to be estimated on the basis of: (a) present value of anticipated future cash flows, (b) the loan’s observable fair market price or (c) fair value of collateral if the loan is collateral dependent. For collateral dependent loans, the amount of the recorded investment in a loan that exceeds the fair value of the collateral is charged-off against the allowance for loan losses in lieu of an allocation of a specific allowance when such an amount has been identified definitively as uncollectible.

In estimating probable loan loss under ASC Topic 450 management considers numerous factors, including historical charge-offs and subsequent recoveries. The formula allowances are based on evaluations of homogenous loans to determine the allocation appropriate within each portfolio segment. Formula allowances are based on internal risk ratings or credit ratings from external sources. Individual loans within the commercial and industrial, commercial real estate and real estate construction loan portfolio segments are assigned internal risk ratings to group them with other loans possessing similar risk characteristics. Changes in risk grades affect the amount of the formula allowance. Risk grades are determined by reviewing current collateral value, financial information, cash flow, payment history and other relevant facts surrounding the particular credit. On these loans, the formula allowances are based on the risk ratings, the historical loss experience, and the loss emergence period. Historical loss data and loss emergence periods are developed based on the Company’s historical experience. For larger loans with available external credit ratings, these ratings are utilized rather than the Company’s risk ratings. The historical loss factor and loss emergence periods for these loans are based on data published by the rating agencies for similar credits as the Company has limited internal historical data. For the residential real estate and consumer loan portfolios, the formula allowances are calculated by applying historical loss experience and the loss emergence period to the outstanding balance in each loan category. Loss factors and loss emergence periods are based on the Company’s historical net loss experience.

Additional allowances are added to portfolio segments based on qualitative factors. Management considers potential factors identified in regulatory guidance. Management has identified certain qualitative factors, which could impact the degree of loss sustained within the portfolio. These include market risk factors and unique portfolio risk factors that are inherent characteristics of the Company’s loan portfolio. Market risk factors may consist of changes to general economic and business conditions, such as unemployment and GDP that may impact the Company’s loan portfolio customer base in terms of ability to repay and that may result in changes in value of underlying collateral. Unique portfolio risk factors may include the outlooks for business segments in which the Company’s borrowers operate and loan size. The potential ranges for qualitative factors are based on historical volatility in losses. The actual amount utilized is based on management’s assessment of current conditions.

After considering the above components, an unallocated component may be generated to cover uncertainties that could affect management’s estimate of probable losses. These uncertainties include the effects of loans in new geographical areas and new industries. The unallocated component of the allowance reflects the margin of imprecision inherent in the underlying assumptions used in the methodologies for estimating allocated and general reserves in the portfolio.

BANK PREMISES AND EQUIPMENT

Bank premises and equipment are stated at cost less accumulated depreciation and amortization. Land is stated at cost. Depreciation is computed using the straight-line method over the estimated useful lives of the assets or the terms of leases, if shorter. It is general practice to charge the cost of maintenance and repairs to operations when incurred; major expenditures for improvements are capitalized and depreciated.

GOODWILL AND IDENTIFIABLE INTANGIBLE ASSETS

Goodwill represents the excess of the cost of an acquisition over the fair value of the net assets acquired. Goodwill is not subject to amortization. Identifiable intangible assets consist of core deposit intangibles and are assets resulting from acquisitions that are being amortized over their estimated useful lives. Goodwill and identifiable intangible assets are included in other assets on the consolidated balance sheets. The Company tests goodwill for impairment on an annual basis, or more often if events or circumstances indicate there may be impairment. Goodwill impairment testing is performed at the segment (or “reporting unit”) level. Currently, the Company’s goodwill is evaluated at the entity level as there is only one reporting unit. Goodwill is assigned to reporting units at the date the goodwill is initially recorded. Once goodwill has been assigned to reporting units, it no longer retains its association with a particular acquisition, and all of the activities within a reporting unit, whether acquired or organically grown, are available to support the value of the goodwill.

Goodwill impairment is evaluated by first assessing qualitative factors (events and circumstances) to determine whether it is more likely than not (meaning a likelihood of more than 50 percent) that the fair value of a reporting unit is less than its carrying amount. If, after considering all relevant events and circumstances, an entity determines it is not more likely than not that the fair value of a reporting unit is less than its carrying amount, then performing the two-step impairment test will be unnecessary.

The first step, in the two-step impairment test, used to identify potential impairment, involves comparing each reporting unit’s fair value to its carrying value including goodwill. If the fair value of a reporting unit exceeds its carrying value, applicable goodwill is considered not to be impaired. If the carrying value exceeds fair value, there is an indication of impairment and the second step is performed to measure the amount of impairment.

SERVICING

The Company services mortgage loans for others. Mortgage servicing assets are recognized as separate assets when rights are acquired through purchase or through sale of financial assets. Fair value is determined using prices for similar assets with similar characteristics, when available, or based upon discounted cash flows using market-based assumptions. The valuation model incorporates assumptions that market participants would use in estimating future net servicing income, such as the cost to service, the discount rate, an inflation rate, ancillary income, prepayment speeds and default rates and losses. Capitalized servicing rights are reported in other assets and are amortized into loan servicing fee income in proportion to, and over the period of, the estimated future net servicing income of the underlying financial assets. Servicing assets are evaluated for impairment based upon the fair value of the rights as compared to amortized cost. Impairment is determined by stratifying rights by predominant risk characteristics, such as interest rates and terms. Impairment is recognized through a valuation allowance for an individual stratum, to the extent that fair value is less than the capitalized amount for the stratum. Changes in the valuation allowance are reported in loan servicing fee income.

STOCK OPTION ACCOUNTING

The Company follows the fair value recognition provisions of FASB ASC 718, Compensation — Stock Compensation for all share-based payments. The Company’s method of valuation for share-based awards granted utilizes the Black-Scholes option-pricing model. The Company will recognize compensation expense for its awards on a straight-line basis over the requisite service period for the entire award (straight-line attribution method), ensuring that the amount of compensation cost recognized at any date at least equals the portion of the grant-date fair value of the award that is vested at that time.

During 2000 and 2004, common stockholders of the Company approved stock option plans (the “Option Plans”) that provide for granting of options to purchase up to 150,000 shares of Class A common stock per plan. Under the Option Plans, all officers and key employees of the Company are eligible to receive nonqualified or incentive stock options to purchase shares of Class A common stock. The Option Plans are administered by the Compensation Committee of the Board of Directors, whose members are ineligible to participate in the Option Plans. Based on management’s recommendations, the Committee submits its recommendations to the Board of Directors as to persons to whom options are to be granted, the number of shares granted to each, the option price (which may not be less than 85% of the fair market value for nonqualified stock options, or the fair market value for incentive stock options, of the shares on the date of grant) and the time period over which the options are exercisable (not more than ten years from the date of grant). There were no options to purchase shares of Class A common stock outstanding at December 31, 2016.

The Company uses the fair value method to account for stock options. There were no options granted during 2016 and 2015.

INCOME TAXES

The Company uses the asset and liability method in accounting for income taxes. Under the asset and liability method, deferred tax assets and liabilities are recognized for the future tax consequences attributable to differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax bases. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which temporary differences are expected to be recovered or settled. Under this method, the effect on deferred tax assets and liabilities of a change in tax rates is recognized in income in the period that includes the enactment date.

The Company accounts for uncertain tax positions in accordance with FASB ASC 740.

The Company classifies interest resulting from underpayment of income taxes as income tax expense in the first period the interest would begin accruing according to the provisions of the relevant tax law.

The Company classifies penalties resulting from underpayment of income taxes as income tax expense in the period for which the Company claims or expects to claim an uncertain tax position or in the period in which the Company’s judgment changes regarding an uncertain tax position.

EARNINGS PER SHARE (“EPS”)

Class A and Class B shares participate equally in undistributed earnings. Under the Company’s Articles of Organization, the holders of Class A Common Stock are entitled to receive dividends per share equal to at least 200% of dividends paid, if any, from time to time, on each share of Class B Common Stock.

Diluted EPS includes the dilutive effect of common stock equivalents; basic EPS excludes all common stock equivalents. The only common stock equivalents for the Company are stock options.

The company utilizes the two class method for reporting EPS. The two-class method is an earnings allocation formula that treats Class A and Class B shares as having rights to earnings that otherwise would have been available only to Class A shareholders and Class B shareholders as if converted to Class A shares.

TREASURY STOCK

Effective July 1, 2004, companies incorporated in Massachusetts became subject to Chapter 156D of the Massachusetts Business Corporation Act, provisions of which eliminate the concept of treasury stock and provide that shares reacquired by a company are to be treated as authorized but unissued shares.

PENSION

The Company provides pension benefits to its employees under a noncontributory, defined benefit plan, which is funded on a current basis in compliance with the requirements of the Employee Retirement Income Security Act of 1974 (“ERISA”) and recognizes costs over the estimated employee service period.

The Company also has a Supplemental Executive Insurance/Retirement Plan (“the Supplemental Plan”), which is limited to certain officers and employees of the Company. The Supplemental Plan is accrued on a current basis and recognizes costs over the estimated employee service period.

Executive officers of the Company or its subsidiaries who have at least one year of service may participate in the Supplemental Plan. The Supplemental Plan is voluntary. Individual life insurance policies, which are owned by the Company, are purchased covering the life of each participant.

The Company utilizes a full yield curve approach in the estimation of the service and interest components by applying the specific spot rates along the yield curve used in the determination of the benefit obligation to the underlying projected cash flows.

RECENT ACCOUNTING DEVELOPMENTS

In May 2014, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) No. 2014-09, Revenue from Contracts with Customers (Topic 606). This ASU is intended to create a single source of revenue guidance which is more principles based than current revenue guidance. The guidance affects any entity that either enters into contracts with customers to transfer goods or services, or enters into contracts for the transfer of non-financial assets, unless those contracts are within the scope of other standards. In August 2015, the FASB issued ASU 2015-14, “Revenue from Contracts with Customers (Topic 606): Deferral of the Effective Date” to amend the effective date of ASU 2014-09. The amendments in ASU 2014-09 are effective for annual and interim periods within fiscal years beginning after December 15, 2017. Earlier adoption is permitted only as of annual reporting periods beginning after December 15, 2016, including interim reporting periods within that reporting period. The FASB has since issued additional related ASUs amendments intended to clarify certain aspects and improve understanding of the implementation guidance of Topic 606 but do not change the core principles of the guidance in Topic 606. The effective date and transition requirements for the amendments are the same as the effective date and transition requirements of Topic 606. The Company is currently evaluating the potential impact of the ASU and its amendments on the Company’s financial statements and results of operations.

In January 2016, FASB issued ASU 2016-1, “Financial Instruments-Overall” (Subtopic 825-10) Recognition and Measurement of Financial Assets and Financial Liabilities. This ASU significantly revises an entity’s accounting related to (1) the classification and measurement of investments in equity securities and (2) the presentation of certain fair value changes for financial liabilities measured at fair value. It also amends certain disclosure requirements associated with the fair value of financial instruments. This ASU is effective for fiscal years beginning after December 15, 2017, including interim periods therein. The Company is currently assessing the applicability of this ASU and has not determined the impact, if any, as of December 31, 2016.

In February 2016, the FASB issued ASU 2016-02, Leases. This ASU requires lessees to put most leases on their balance sheet but recognize expenses on their income statements in a manner similar to today’s accounting. This ASU also eliminates today’s real estate-specific provisions for all companies. For lessors, this ASU modifies the classification criteria and the accounting for sales-type and direct financing leases. This ASU is effective for fiscal years beginning after December 15, 2018, including interim periods therein. Early adoption is permitted. The Company is currently assessing the applicability of this ASU and has not determined the impact, if any, as of December 31, 2016.

In March 2016, the FASB issued ASU 2016-07, Investments — Equity Method and Joint Ventures (Topic 323) Simplifying the Transition to the Equity Method of Accounting. This ASU requires that an entity that has an available-for-sale equity security that becomes qualified for the equity method of accounting recognize through earnings the unrealized holding gain or loss in accumulated other comprehensive income at the date the investment becomes qualified for use of the equity method. This ASU is effective for all entities for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2016. The effect of this update is not expected to have a material impact on the Company’s consolidated financial position.

In March 2016, the FASB issued ASU 2016-09, Compensation — Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting. This ASU was issued as part of the FASB Simplification Initiative which intends to reduce the complexity of GAAP while improving usefulness to users. There are eight main items in this ASU that contribute to the simplification of share-based accounting. For public entities, this ASU is effective for the fiscal years beginning after December 15, 2016, including interim periods within those fiscal years. Early adoption is permitted. The effect of this update is not expected to have a material impact on the Company’s consolidated financial position.

In June 2016, the FASB issued ASU 2016-13, Financial Instruments-Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments. This ASU was issued to provide financial statement users with more decision-useful information about the expected credit losses on financial instruments and other commitments to extend credit held by a reporting entity at each reporting date. To achieve this objective, the amendments in this ASU replace the incurred loss impairment methodology in current GAAP with a methodology that reflects expected credit losses and requires consideration of a broader range of reasonable and supportable information to inform credit loss estimates. The amendments in this ASU are effective for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years. The Company is currently assessing this ASU and has not determined the impact, if any, as of December 31, 2016.

In August 2016, the FASB issued ASU 2016-15, Statement of Cash Flows (Topic 326) Classification of Certain Cash Receipts and Cash Payments. Stakeholders indicated that there is diversity in practice in how certain cash receipts and cash payments are presented and classified in the statement of cash flows under Topic 230, Statement of Cash Flows, and other Topics. This ASU addresses eight specific cash flow issues with the objective of reducing the existing diversity in practice. The amendments in this Update are effective for public business entities for fiscal years beginning after December 15, 2017, and interim periods within those fiscal years. The Company is currently assessing the applicability of this ASU and has not determined the impact, if any, as of December 31, 2016.

In October 2016, the FASB issued ASU 2016-16, Income Taxes (Topic 740) Intra-Entity Transfers of Assets Other Than Inventory. This ASU was issued to improve the accounting for income tax consequences of intra-entity transfers of assets other than inventory. For public entities, this ASU is effective for the fiscal years beginning after December 15, 2017, including interim periods within those fiscal years. Early adoption is permitted. Management is currently assessing the applicability of this ASU and has not determined the impact, if any, as of December 31, 2016.

In October 2016, the FASB issued ASU 2016-17, Consolidation (Topic 810) Interests Held through Related Parties That Are under Common Control. The amendments of this ASU affect reporting entities that are required to evaluate whether they should consolidate a Variable Interest Entity within the Variable Interest Entities Subsections of Subtopic 810-10, Consolidation — Overall, in certain situations involving entities under common control. For public entities, this ASU is effective for the fiscal years beginning after December 15, 2016, including interim periods within those fiscal years. Early adoption is permitted. The effect of this update is not expected to have a material impact on the Company’s consolidated financial position.

In November 2016, the FASB issued ASU 2016-18, Statement of Cash Flows (Topic 230) Restricted Cash. The amendments of this ASU was issued 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. For public entities, this ASU is effective for the fiscal years beginning after December 15, 2017, including interim periods within those fiscal years. Early adoption is permitted. Management is currently assessing the applicability of this ASU and has not determined the impact, if any, as of December 31, 2016.

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Cash and Due from Banks

12 Months Ended

Dec. 31, 2016

Cash and Cash Equivalents [Abstract]

Cash and Due from Banks

2.     Cash and Due from Banks

The Company is required to maintain a portion of its cash and due from banks as a reserve balance under the Federal Reserve Act. Such reserve is calculated based upon deposit levels and amounted to $0 at December 31, 2016, and $0 at December 31, 2015.

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Securities Available-for-Sale

12 Months Ended

Dec. 31, 2016

Text Block [Abstract]

Securities Available-for-Sale

3.     Securities Available-for-Sale

	December 31, 2016								December 31, 2015
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Value		Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Value
(dollars in thousands)
U.S. Treasury	$	2,000	$	—	$	—	$	2,000	$	1,999	$	—	$	10	$	1,989
U.S. Government Sponsored Enterprises		25,000		—		48		24,952		—		—		—		—
SBA Backed Securities		57,899		14		146		57,767		5,983		8		2		5,989
U.S. Government Agency and Sponsored Enterprises Mortgage-Backed Securities		243,703		293		671		243,325		232,967		859		300		233,526
Privately Issued Residential Mortgage-Backed Securities		1,121		2		14		1,109		1,437		10		13		1,434
Obligations Issued by States and Political Subdivisions		165,281		—		405		164,876		157,838		—		878		156,960
Other Debt Securities		5,100		18		194		4,924		4,600		3		130		4,473
Equity Securities		116		228		—		344		153		99		—		252
Total	$	500,220	$	555	$	1,478	$	499,297	$	404,977	$	979	$	1,333	$	404,623

Included in SBA Backed Securities and U.S. Government Agency and Sponsored Enterprises Mortgage-Backed Securities are securities at fair value pledged to secure public deposits and repurchase agreements amounting to $210,780,000 and $220,482,000 at December 31, 2016 and 2015, respectively. Also included in securities available-for-sale at fair value are securities pledged for borrowing at the Federal Home Loan Bank amounting to $53,396,000 and $20,056,000 at December 31, 2016 and 2015, respectively. The Company realized gains on sales of securities of $52,000, $289,000, and $450,000 from the proceeds of sales of available-for-sale securities of $2,376,000, $47,853,000, and $40,285,000 for the years ended December 31, 2016, 2015, and 2014, respectively.

Debt securities of U.S. Government Agency and Sponsored Enterprises Mortgage-Backed Securities primarily refer to debt securities of Fannie Mae and Freddie Mac.

The following table shows the estimated maturity distribution of the Company’s securities available-for-sale at December 31, 2016.

	Amortized Cost		Fair Value
(dollars in thousands)
Within one year	$	173,276	$	173,263
After one but within five years		107,005		106,782
After five but within ten years		168,698		168,347
More than ten years		49,625		49,207
Nonmaturing		1,616		1,698
Total	$	500,220	$	499,297

The weighted average remaining life of investment securities available-for-sale at December 31, 2016, was 4.4 years. Included in the weighted average remaining life calculation at December 31, 2106, were $15,000,000 of US Government Sponsored Enterprises obligations that are callable at the discretion of the issuer. The contractual maturities, which were used in the table above, of mortgage-backed securities, will differ from the actual maturities due to the ability of the issuers to prepay underlying obligations. Also, $301,253,000 of the securities are floating rate or adjustable rate and reprice prior to maturity.

As of December 31, 2016 and December 31, 2015, management concluded that the unrealized losses of its investment securities are temporary in nature since they are not related to the underlying credit quality of the issuers, and the Company does not intend to sell these debt securities and it is not more likely than not that it will be required to sell these debt securities before the anticipated recovery of its remaining amortized cost. In making its other-than-temporary impairment evaluation, the Company considered the fact that the principal and interest on these securities are from issuers that are investment grade. The change in the unrealized losses on the Obligations Issued by States and Political Subdivisions, Privately Issued Residential Mortgage-Backed Securities and Other Debt Securities was primarily caused by changes in credit spreads and liquidity issues in the marketplace.

The unrealized loss on SBA Backed Securities and U.S. Government Agency and Sponsored Enterprises Mortgage-Backed Securities related primarily to interest rates and not credit quality and because the Company has the ability and intent to hold these investments until recovery of fair value, which may be maturity. The Company does not consider these investments to be other-than-temporarily impaired at December 31, 2016 and December 31, 2015.

In evaluating the underlying credit quality of a security, management considers several factors such as the credit rating of the obligor and the issuer, if applicable. Internal reviews of issuer financial statements are performed as deemed necessary. In the case of privately issued mortgage-backed securities, the performance of the underlying loans is analyzed as deemed necessary to determine the estimated future cash flows of the securities. Factors considered include the level of subordination, current and estimated future default rates, current and estimated prepayment rates, estimated loss severity rates, geographic concentrations and origination dates of underlying loans. In the case of marketable equity securities, the severity of the unrealized loss, the length of time the unrealized loss has existed, and the issuer’s financial performance are considered.

The following table shows the temporarily impaired securities of the Company’s available-for-sale portfolio at December 31, 2016. This table shows the unrealized market loss of securities that have been in a continuous unrealized loss position for 12 months or less and a continuous loss position for 12 months and longer. There are 49 and 15 securities that are temporarily impaired for less than 12 months and for 12 months or longer, respectively, out of a total of 270 holdings at December 31, 2016.

	December 31, 2016
	Less Than 12 Months				12 Months or Longer				Total
Temporarily Impaired Investments	Fair Value		Unrealized Losses		Fair Value		Unrealized Losses		Fair Value		Unrealized Losses
(dollars in thousands)
U.S. Treasury	$	—	$	—	$	—	$	—	$	—	$	—
U.S. Government Sponsored Enterprises		24,952		48		—		—		24,952		48
SBA Backed Securities		52,346		145		951		1		53,297		146
U.S. Government Agency and Sponsored Enterprise Mortgage-Backed Securities		135,612		485		31,504		186		167,116		671
Privately Issued Residential Mortgage-Backed Securities		—		—		757		14		757		14
Obligations Issued by States and Political Subdivisions		—		—		4,298		405		4,298		405
Other Debt Securities		453		47		1,553		147		2,006		194
Total temporarily impaired securities	$	213,363	$	725	$	39,063	$	753	$	252,426	$	1,478

The following table shows the temporarily impaired securities of the Company’s available-for-sale portfolio at December 31, 2015. This table shows the unrealized market loss of securities that have been in a continuous unrealized loss position for 12 months or less and a continuous loss position for 12 months and longer. There are 14 and 11 securities that are temporarily impaired for less than 12 months and for 12 months or longer, respectively, out of a total of 290 holdings at December 31, 2015.

	December 31, 2015
	Less Than 12 Months				12 Months or Longer				Total
Temporarily Impaired Investments	Fair Value		Unrealized Losses		Fair Value		Unrealized Losses		Fair Value		Unrealized Losses
(dollars in thousands)
U.S. Treasury	$	1,989	$	10	$	—	$	—	$	1,989	$	10
SBA Backed Securities		1,031		2		—		—		1,031		2
U.S. Government Agency and Sponsored Enterprise Mortgage-Backed Securities		26,519		52		49,341		248		75,860		300
Privately Issued Residential Mortgage-Backed Securities		—		—		490		13		490		13
Obligations Issued by States and Political Subdivisions		—		—		3,820		878		3,820		878
Other Debt Securities		497		3		1,373		127		1,870		130
Total temporarily impaired securities	$	30,036	$	67	$	55,024	$	1,266	$	85,060	$	1,333

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Investment Securities Held-to-Maturity

12 Months Ended

Dec. 31, 2016

Text Block [Abstract]

Investment Securities Held-to-Maturity

4.     Investment Securities Held-to-Maturity

	December 31, 2016								December 31, 2015
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Value		Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Value
(dollars in thousands)
U.S. Government Sponsored Enterprises	$	148,326	$	1,066	$	527	$	148,865	$	186,734	$	2,234	$	141	$	188,827
SBA Backed Securities		46,140		—		1,088		45,052		—		—		—		—
U.S. Government Sponsored Enterprises Mortgage-Backed Securities		1,459,520		4,948		22,577		1,441,891		1,252,169		7,547		9,583		1,250,133
Total	$	1,653,986	$	6,014	$	24,192	$	1,635,808	$	1,438,903	$	9,781	$	9,724	$	1,438,960

Included in U.S. Government Sponsored Enterprises and U.S. Government Sponsored Enterprise Mortgage-Backed Securities are securities pledged to secure public deposits and repurchase agreements at fair value amounting to $1,147,207,000 and $1,004,743,000 at December 31, 2016, and 2015, respectively. Also included are securities pledged for borrowing at the Federal Home Loan Bank at fair value amounting to $424,353,000 and $432,965,000 at December 31, 2016, and 2015, respectively. The Company realized gains of sales of securities of $12,000 from the proceeds of sales of held-to-maturity securities of $192,000 for the year ending December 31, 2016. The sales from securities held-to-maturity relate to certain mortgage-backed securities for which the Company had previously collected a substantial portion of its principal investment. The Company realized gains on sales of securities of $305,000 from the proceeds of sales of held-to-maturity securities of $3,698,000 for the year ending December 31, 2015. There were no sales of held-to-maturity securities for the year ending December 31, 2014.

At December 31, 2016 and 2015, all mortgage-backed securities are obligations of U.S. Government Sponsored Enterprises. Government Sponsored Enterprises primarily refer to debt securities of Fannie Mae and Freddie Mac.

The following table shows the maturity distribution of the Company’s securities held-to-maturity at December 31, 2016.

	Amortized Cost		Fair Value
(dollars in thousands)
Within one year	$	22,802	$	22,911
After one but within five years		1,122,678		1,114,481
After five but within ten years		500,355		490,546
More than ten years		8,151		7,870
Total	$	1,653,986	$	1,635,808

The weighted average remaining life of investment securities held-to-maturity at December 31, 2016, was 4.5 years. Included in the weighted average remaining life calculation at December 31, 2016, were $59,745,000 of U.S. Government Sponsored Enterprises obligations that are callable at the discretion of the issuer. The contractual maturities, which were used in the table above, of mortgage-backed securities, will differ from the actual maturities due to the ability of the issuers to prepay underlying obligations. Also, $188,000 of the securities are floating rate or adjustable rate and reprice prior to maturity.

As of December 31, 2016 and December 31, 2015, management concluded that the unrealized losses of its investment securities are temporary in nature since they are not related to the underlying credit quality of the issuers, and the Company does not intend to sell these debt securities and it is not more likely than not that it will be required to sell these debt securities before the anticipated recovery of their remaining amortized costs. In making its other-than-temporary impairment evaluation, the Company considered the fact that the principal and interest on these securities are from issuers that are investment grade.

The unrealized loss on U.S. Government Sponsored Enterprises and U.S. Government Sponsored Enterprises Mortgage-Backed Securities related primarily to interest rates and not credit quality, and because the Company does not intend to sell any of these securities and it is not more likely than not that it will be required to sell these securities before the anticipated recovery of the remaining amortized cost, the Company does not consider these investments to be other-than-temporarily impaired at December 31, 2016 and December 31, 2015.

In evaluating the underlying credit quality of a security, management considers several factors such as the credit rating of the obligor and the issuer, if applicable. Internal reviews of issuer financial statements are performed as deemed necessary.

The following table shows the temporarily impaired securities of the Company’s held-to-maturity portfolio at December 31, 2016. This table shows the unrealized market loss of securities that have been in a continuous unrealized loss position for 12 months or less and a continuous loss position for 12 months and longer. There are 194 and 16 securities that are temporarily impaired for less than 12 months and for 12 months or longer, respectively, out of a total of 375 holdings at December 31, 2016.

	December 31, 2016
	Less Than 12 Months				12 Months or Longer				Total
Temporarily Impaired Investments	Fair Value		Unrealized Losses		Fair Value		Unrealized Losses		Fair Value		Unrealized Losses
(dollars in thousands)
U.S. Government Sponsored Enterprises	$	59,219	$	527	$	—	$	—	$	59,219	$	527
SBA Backed Securities		45,052		1,088		—		—		45,052		1,088
U.S. Government Agency and Sponsored Enterprise Mortgage-Backed Securities		1,008,960		20,725		58,535		1,852		1,067,495		22,577
Total temporarily impaired securities	$	1,113,231	$	22,340	$	58,535	$	1,852	$	1,171,766	$	24,192

The following table shows the temporarily impaired securities of the Company’s held-to-maturity portfolio at December 31, 2015. This table shows the unrealized market loss of securities that have been in a continuous unrealized loss position for 12 months or less and a continuous loss position for 12 months and longer. There are 101 and 26 securities that are temporarily impaired for less than 12 months and for 12 months or longer, respectively, out of a total of 322 holdings at December 31, 2015.

	December 31, 2015
	Less Than 12 Months				12 Months or Longer				Total
Temporarily Impaired Investments	Fair Value		Unrealized Losses		Fair Value		Unrealized Losses		Fair Value		Unrealized Losses
(dollars in thousands)
U.S. Government Sponsored Enterprises	$	9,859	$	141	$	—	$	—	$	9,859	$	141
U.S. Government Agency and Sponsored Enterprise Mortgage-Backed Securities		626,218		6,657		123,864		2,926		750,082		9,583
Total temporarily impaired securities	$	636,077	$	6,798	$	123,864	$	2,926	$	759,941	$	9,724

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Loans

12 Months Ended

Dec. 31, 2016

Debt Disclosure [Abstract]

Loans

5.     Loans

The majority of the Bank’s lending activities are conducted in Massachusetts with other lending activity principally in New Hampshire, Rhode Island, Connecticut and New York. The Bank originates construction, commercial and residential real estate loans, commercial and industrial loans, municipal loans, consumer, home equity and other loans for its portfolio.

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

December 31,	2016		2015
(dollars in thousands)
Construction and land development	$	14,928	$	27,421
Commercial and industrial		612,503		452,235
Municipal		135,418		85,685
Commercial real estate		696,173		721,506
Residential real estate		241,357		255,346
Consumer		11,013		10,744
Home equity		211,857		178,020
Overdrafts		684		579
Total	$	1,923,933	$	1,731,536

At December 31, 2016, and December 31, 2015, loans were carried net of discounts of $313,000 and $360,000, respectively. Net deferred fees included in loans at December 31, 2016, and December 31, 2015, were $641,000 and $988,000, respectively.

The Company was servicing mortgage loans sold to others without recourse of approximately $229,730,000 and $185,299,000 at December 31, 2016, and December 31, 2015, respectively. The Company had no residential real estate loans held for sale at December 31, 2016 and December 31, 2015. The Company’s mortgage servicing rights totaled $1,629,000 and $1,305,000 at December 31, 2016 and December 31, 2015, respectively.

As of December 31, 2016 and 2015, the Company’s recorded investment in impaired loans was $3,830,000 and $3,225,000, respectively. If an impaired loan is placed on nonaccrual, the loan may be returned to an accrual status when principal and interest payments are not delinquent and the risk characteristics have improved to the extent that there no longer exists a concern as to the collectibility of principal and interest. At December 31, 2016, there were $3,105,000 of impaired loans with a specific reserve of $173,000. At December 31, 2015, there were $3,051,000 of impaired loans with specific reserves of $250,000.

Loans are designated as troubled debt restructures when a concession is made on a credit as a result of financial difficulties of the borrower. Typically, such concessions consist of a reduction in interest rate to a below-market rate, taking into account the credit quality of the note, or a deferment of payments, principal or interest, which materially alters the Bank’s position or significantly extends the note’s maturity date, such that the present value of cash flows to be received is materially less than those contractually established at the loan’s origination. Restructured loans are included in the impaired loan category.

The composition of nonaccrual loans and impaired loans is as follows:

December 31,	2016		2015		2014
(dollars in thousands)
Loans on nonaccrual	$	1,084	$	2,336	$	4,146
Loans 90 days past due and still accruing		—		—		—
Impaired loans on nonaccrual included above		304		332		3,031
Total recorded investment in impaired loans		3,830		3,225		6,327
Average recorded investment of impaired loans		3,661		4,490		7,434
Accruing troubled debt restructures		3,526		2,893		3,296
Interest income not recorded on nonaccrual loans according to their original terms		37		91		123
Interest income on nonaccrual loans actually recorded		—		—		—
Interest income recognized on impaired loans		140		104		144

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.

The following table shows the aggregate amount of loans to directors and officers of the Company and their associates during 2016.

Balance at December 31, 2015	Additions		Repayments and Deletions		Balance at December 31, 2016
(dollars in thousands)
$5,010	$	6,778	$	806	$	10,982

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Allowance for Loan Losses

12 Months Ended

Dec. 31, 2016

Receivables [Abstract]

Allowance for Loan Losses

6.     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. The following table summarizes the changes in the Company’s allowance for loan losses for the years indicated.

An analysis of the allowance for loan losses for each of the three years ending December 31, 2016, 2015 and 2014 is as follows:

	2016			2015			2014
(dollars in thousands)
Allowance for loan losses, beginning of year	$	23,075		$	22,318		$	20,941
Loans charged-off		(389	)		(781	)		(1,382	)
Recoveries on loans previously charged-off		434			1,338			709
Net recoveries (charge-offs)		45			557			(673	)
Provision charged to expense		1,375			200			2,050
Reclassification to other liabilities*		(89	)		—			—
Allowance for loan losses, end of year	$	24,406		$	23,075		$	22,318

* The reclassification relates to allowance for loan losses allocations on unused commitments that have been reclassified to other liabilities.

Further information pertaining to the allowance for loan losses at December 31, 2016 follows:

	Construction and Land Development			Commercial and Industrial			Municipal		Commercial Real Estate			Residential Real Estate			Consumer			Home Equity			Unallocated			Total
(dollars in thousands)
Allowance for Loan Losses:
Balance at December 31, 2015	$	2,041		$	5,899		$	994	$	10,589		$	1,320		$	644		$	1,077		$	511		$	23,075
Charge-offs		—			—			—		—			—			(362	)		(27	)		—			(389	)
Recoveries		—			132			—		—			6			296			—			—			434
Reclassification to other liabilities		(5	)		(25	)		—		(9	)		(3	)		(3	)		(44	)		—			(89	)
Provision		(1,024	)		966			618		555			375			7			96			(218	)		1,375
Ending balance at December 31, 2016	$	1,012		$	6,972		$	1,612	$	11,135		$	1,698		$	582		$	1,102		$	293		$	24,406
Amount of allowance for loan losses for loans deemed to be impaired	$	3		$	23		$	—	$	140		$	7		$	—		$	—		$	—		$	173
Amount of allowance for loan losses for loans not deemed to be impaired	$	1,009		$	6,949		$	1,612	$	10,995		$	1,691		$	582		$	1,102		$	293		$	24,233
Loans:
Ending balance	$	14,928		$	612,503		$	135,418	$	696,173		$	241,357		$	11,697		$	211,857		$	—		$	1,923,933
Loans deemed to be impaired	$	94		$	389		$	—	$	3,149		$	198		$	—		$	—		$	—		$	3,830
Loans not deemed to be impaired	$	14,834		$	612,114		$	135,418	$	693,024		$	241,159		$	11,697		$	211,857		$	—		$	1,920,103

Further information pertaining to the allowance for loan losses at December 31, 2015 follows:

	Construction and Land Development			Commercial and Industrial			Municipal			Commercial Real Estate			Residential Real Estate		Consumer			Home Equity		Unallocated			Total
(dollars in thousands)
Allowance for Loan Losses:
Balance at December 31, 2014	$	1,592		$	4,757		$	1,488		$	11,199		$	776	$	810		$	599	$	1,097		$	22,318
Charge-offs		—			(172	)		—			(298	)		—		(311	)		—		—			(781	)
Recoveries		780			212			—			84			7		255			—		—			1,338
Provision		(331	)		1,102			(494	)		(396	)		537		(110	)		478		(586	)		200
Ending balance at December 31, 2015	$	2,041		$	5,899		$	994		$	10,589		$	1,320	$	644		$	1,077	$	511		$	23,075
Amount of allowance for loan losses for loans deemed to be impaired	$	10		$	19		$	—		$	99		$	32	$	—		$	90	$	—		$	250
Amount of allowance for loan losses for loans not deemed to be impaired	$	2,031		$	5,880		$	994		$	10,490		$	1,288	$	644		$	987	$	511		$	22,825
Loans:
Ending balance	$	27,421		$	452,235		$	85,685		$	721,506		$	255,346	$	11,323		$	178,020	$	—		$	1,731,536
Loans deemed to be impaired	$	98		$	443		$	—		$	1,678		$	916	$	—		$	90	$	—		$	3,225
Loans not deemed to be impaired	$	27,323		$	451,792		$	85,685		$	719,828		$	254,430	$	11,323		$	177,930	$	—		$	1,728,311

CREDIT QUALITY INFORMATION

The Company utilizes a six-grade internal loan rating system for commercial real estate, construction and commercial loans as follows:

Loans rated 1-3 (Pass) — Loans in this category are considered “pass” rated loans with low to average risk.

Loans rated 4 (Monitor) — These loans represent classified loans that management is closely monitoring for credit quality. These loans have had or may have minor credit quality deterioration as of December 31, 2016.

Loans rated 5 (Substandard) — Substandard loans represent classified loans that management is closely monitoring for credit quality. These loans have had more significant credit quality deterioration as of December 31, 2016.

Loans rated 6 (Doubtful) — Doubtful loans represent classified loans that management is closely monitoring for credit quality. These loans had more significant credit quality deterioration as of December 31, 2016, and are doubtful for full collection.

Impaired — Impaired loans represent classified loans that management is closely monitoring for credit quality. A loan is classified as impaired when it is probable that the Company will be unable to collect all amounts due.

The following table presents the Company’s loans by risk rating at December 31, 2016.

	Construction and Land Development		Commercial and Industrial		Municipal		Commercial Real Estate
(dollars in thousands)
Grade:
1-3 (Pass)	$	14,834	$	612,114	$	135,418	$	661,271
4 (Monitor)		—		—		—		31,753
5 (Substandard)		—		—		—		—
6 (Doubtful)		—		—		—		—
Impaired		94		389		—		3,149
Total	$	14,928	$	612,503	$	135,418	$	696,173

The Company has increased its exposure to larger loans to large institutions with publicly available credit ratings beginning in 2015. These ratings are tracked as a credit quality indicator for these loans.

The following table presents the Company’s loans by credit rating at December 31, 2016.

	Commercial and Industrial		Municipal		Commercial Real Estate		Total
(dollars in thousands)
Credit Rating:
Aaa-Aa3	$	334,674	$	66,245	$	6,596	$	407,515
A1-A3		188,777		33,365		129,423		351,565
Baa1-Baa3		—		26,970		127,366		154,336
Ba2		—		3,610		—		3,610
Total	$	523,451	$	130,190	$	263,385	$	917,026

The following table presents the Company’s loans by risk rating at December 31, 2015.

	Construction and Land Development		Commercial and Industrial		Municipal		Commercial Real Estate
(dollars in thousands)
Grade:
1-3 (Pass)	$	20,281	$	451,774	$	85,685	$	718,911
4 (Monitor)		7,042		18		—		917
5 (Substandard)		—		—		—		—
6 (Doubtful)		—		—		—		—
Impaired		98		443		—		1,678
Total	$	27,421	$	452,235	$	85,685	$	721,506

The following table presents the Company’s loans by credit rating at December 31, 2015.

	Commercial and Industrial		Municipal		Commercial Real Estate		Total
(dollars in thousands)
Credit Rating:
Aaa-Aa3	$	234,733	$	63,865	$	7,547	$	306,145
A1-A3		140,419		7,400		130,872		278,691
Baa1-Baa3		—		8,890		167,489		176,379
Ba2		—		4,480		—		4,480
Total	$	375,152	$	84,635	$	305,908	$	765,695

The Company utilized payment performance as credit quality indicators for residential real estate, consumer and overdrafts, and the home equity portfolio. The indicators are depicted in the table “aging of past-due loans,” below.

AGING OF PAST-DUE LOANS

At December 31, 2016 the aging of past due loans are as follows:

	Accruing 30-89 Days Past Due		Non Accrual		Accruing Greater Than 90 Days		Total Past Due		Current Loans		Total
(dollars in thousands)
Construction and land development	$	—	$	94	$	—	$	94	$	14,834	$	14,928
Commercial and industrial		37		65		—		102		612,401		612,503
Municipal		—		—		—		—		135,418		135,418
Commercial real estate		597		150		—		747		695,426		696,173
Residential real estate		245		656		—		901		240,456		241,357
Consumer and overdrafts		—		11		—		11		11,686		11,697
Home equity		735		108		—		843		211,014		211,857
Total	$	1,614	$	1,084	$	—	$	2,698	$	1,921,235	$	1,923,933

At December 31, 2015 the aging of past due loans are as follows:

	Accruing 30-89 Days Past Due		Non Accrual		Accruing Greater Than 90 Days		Total Past Due		Current Loans		Total
(dollars in thousands)
Construction and land development	$	—	$	99	$	—	$	99	$	27,322	$	27,421
Commercial and industrial		—		60		—		60		452,175		452,235
Municipal		—		—		—		—		85,685		85,685
Commercial real estate		1,462		174		—		1,636		719,870		721,506
Residential real estate		596		1,559		—		2,155		253,191		255,346
Consumer and overdrafts		6		—		—		6		11,317		11,323
Home equity		628		444		—		1,072		176,948		178,020
Total	$	2,692	$	2,336	$	—	$	5,028	$	1,726,508	$	1,731,536

IMPAIRED LOANS

A loan is impaired when, based on current information and events, it is probable that a creditor will be unable to collect all amounts due according to the contractual terms of the loan agreement. When a loan is impaired, the Company measures impairment based on the present value of expected future cash flows discounted at the loan’s effective interest rate, except that as a practical expedient, the Company measures impairment based on a loan’s observable market price or the fair value of the collateral if the loan is collateral dependent. Loans are charged-off when management believes that the collectibility of the loan’s principal is not probable. The specific factors that management considers in making the determination that the collectibility of the loan’s principal is not probable include; the delinquency status of the loan, the fair value of the collateral, if secured, and the financial strength of the borrower and/or guarantors. For collateral dependent loans, the amount of the recorded investment in a loan that exceeds the fair value of the collateral is charged-off against the allowance for loan losses in lieu of an allocation of a specific allowance amount when such an amount has been identified definitively as uncollectible. The Company’s policy for recognizing interest income on impaired loans is contained within Note 1 of the “Notes to Consolidated Financial Statements.”

The following is information pertaining to impaired loans at December 31, 2016:

	Carrying Value		Unpaid Balance Principal		Required Reserve		Average Carrying Value Recognized		Interest Income
(dollars in thousands)
With no required reserve recorded:
Construction and land development	$	—	$	—	$	—	$	—	$	—
Commercial and industrial		45		232		—		53		—
Municipal		—		—		—		—		—
Commercial real estate		590		590		—		375		39
Residential real estate		90		179		—		102		7
Consumer		—		—		—		—		—
Home equity		—		—		—		—		—
Total	$	725	$	1,001	$	—	$	530	$	46
With required reserve recorded:
Construction and land development	$	94	$	108	$	3	$	96	$	—
Commercial and industrial		344		360		23		360		18
Municipal		—		—		—		—		—
Commercial real estate		2,559		2,665		140		2,324		71
Residential real estate		108		108		7		323		5
Consumer		—		—		—		—		—
Home equity		—		—		—		28		—
Total	$	3,105	$	3,241	$	173	$	3,131	$	94
Total
Construction and land development	$	94	$	108	$	3	$	96	$	—
Commercial and industrial		389		592		23		413		18
Municipal		—		—		—		—		—
Commercial real estate		3,149		3,255		140		2,699		110
Residential real estate		198		287		7		425		12
Consumer		—		—		—		—		—
Home equity		—		—		—		28		—
Total	$	3,830	$	4,242	$	173	$	3,661	$	140

The following is information pertaining to impaired loans at December 31, 2015:

	Carrying Value		Unpaid Balance Principal		Required Reserve		Average Carrying Value Recognized		Interest Income
(dollars in thousands)
With no required reserve recorded:
Construction and land development	$	—	$	—	$	—	$	—	$	—
Commercial and industrial		60		246		—		32		—
Municipal		—		—		—		—		—
Commercial real estate		—		—		—		151		—
Residential real estate		114		200		—		125		8
Consumer		—		—		—		—		—
Home equity		—		—		—		—		—
Total	$	174	$	446	$	—	$	308	$	8
With required reserve recorded:
Construction and land development	$	98	$	108	$	10	$	101	$	—
Commercial and industrial		383		399		19		626		20
Municipal		—		—		—		—		—
Commercial real estate		1,678		1,776		99		2,550		69
Residential real estate		802		802		32		814		7
Consumer		—		—		—		—		—
Home equity		90		90		90		91		—
Total	$	3,051	$	3,175	$	250	$	4,182	$	96
Total
Construction and land development	$	98	$	108	$	10	$	101	$	—
Commercial and industrial		443		645		19		658		20
Municipal		—		—		—		—		—
Commercial real estate		1,678		1,776		99		2,701		69
Residential real estate		916		1,002		32		939		15
Consumer		—		—		—		—		—
Home equity		90		90		90		91		—
Total	$	3,225	$	3,621	$	250	$	4,490	$	104

Troubled Debt Restructurings are identified as a modification in which a concession was granted to a customer who was having financial difficulties. This concession may be below market rate, longer amortization/term, or a lower payment amount. The present value calculation of the modification did not result in an increase in the allowance for these loans beyond any previously established allocations.

There was one commercial real estate troubled debt restructuring during the year ended December 31, 2016. The pre-modification and post-modification outstanding recorded investment was $2,091,000. The loan was modified in 2016, by reducing the interest rate as well as extending the term on the loan. The financial impact for the modification was $16,000 reduction in principal payments and $5,000 reduction in interest payments for 2016.

There were no troubled debt restructurings occurring during the year ended December 31, 2015. Also, there were no commitments to lend additional funds to troubled debt restructuring borrowers. There were no troubled debt restructurings that subsequently defaulted during 2015 and 2016.

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Bank Premises and Equipment

12 Months Ended

Dec. 31, 2016

Property, Plant and Equipment [Abstract]

Bank Premises and Equipment

7.     Bank Premises and Equipment

December 31,	2016			2015			Estimated Useful Life
(dollars in thousands)
Land	$	3,478		$	3,478			—
Bank premises		19,272			19,272			30-39 years
Furniture and equipment		26,271			24,131			3-10 years
Leasehold improvements		12,802			12,892			30-39 years or lease term
		61,823			59,773
Accumulated depreciation and amortization		(38,406	)		(35,667	)
Total	$	23,417		$	24,106

The Company is obligated under a number of non-cancelable operating leases for premises and equipment expiring in various years through 2026. Total lease expense approximated $2,834,000, $2,755,000 and $2,465,000 for the years ended December 31, 2016, 2015 and 2014, respectively. Included in lease expense are amounts paid to a company affiliated with Marshall M. Sloane, Chairman of the Board, amounting to $424,000, $413,000, and $208,000, respectively. Rental income approximated $318,000, $314,000 and $307,000 in 2016, 2015 and 2014, respectively. Depreciation and amortization amounted to $3,099,000, $2,728,000, and $2,322,000 at December 31, 2016, 2015 and 2014 respectively.

Future minimum rental commitments for non-cancelable operating leases with initial or remaining terms of one year or more at December 31, 2016, were as follows:

Year		Amount
(dollars in thousands)
	2017	$	2,408
	2018		2,222
	2019		2,054
	2020		1,777
	2021		1,326
	Thereafter		2,526
		$	12,313

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Goodwill and Identifiable Intangible Assets

12 Months Ended

Dec. 31, 2016

Goodwill and Intangible Assets Disclosure [Abstract]

Goodwill and Identifiable Intangible Assets

8.     Goodwill and Identifiable Intangible Assets

At December 31, 2016 and 2015, the Company concluded that it is not more likely than not that fair value of the reporting unit is less than its carrying value, and goodwill is not considered to be impaired.

The changes in goodwill and identifiable intangible assets for the years ended December 31, 2016 and 2015 are shown in the table below.

Carrying Amount of Goodwill and Intangibles	Goodwill		Mortgage Servicing Rights			Total
(dollars in thousands)
Balance at December 31, 2014	$	2,714	$	941		$	3,655
Additions		—		626			626
Amortization Expense		—		(262	)		(262	)
Balance at December 31, 2015	$	2,714	$	1,305		$	4,019
Additions		—		708			708
Amortization Expense		—		(384	)		(384	)
Balance at December 31, 2016	$	2,714	$	1,629		$	4,343

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Fair Value Measurements

12 Months Ended

Dec. 31, 2016

Fair Value Disclosures [Abstract]

Fair Value Measurements

9.     Fair Value Measurements

The Company follows FASB ASC 820-10, Fair Value Measurements and Disclosures, which among other things, requires enhanced disclosures about assets and liabilities carried at fair value. ASC 820-10 establishes a hierarchal disclosure framework associated with the level of pricing observability utilized in measuring financial instruments at fair value. The three broad levels of the hierarchy are as follows:

Level I — Quoted prices are available in active markets for identical assets or liabilities as of the reported date. The type of financial instruments included in Level I are highly liquid cash instruments with quoted prices such as G-7 government, agency securities, listed equities and money market securities, as well as listed derivative instruments.

Level II — Pricing inputs are other than quoted prices in active markets, which are either directly or indirectly observable as of the reported date. The nature of these financial instruments include cash instruments for which quoted prices are available but traded less frequently, derivative instruments whose fair value have been derived using a model where inputs to the model are directly observable in the market, or can be derived principally from or corroborated by observable market data, and instruments that are fair valued using other financial instruments, the parameters of which can be directly observed. Instruments which are generally included in this category are corporate bonds and loans, mortgage whole loans, municipal bonds and OTC derivatives.

Level III — These instruments have little to no pricing observability as of the reported date. These financial instruments do not have two-way markets and are measured using management’s best estimate of fair value, where the inputs into the determination of fair value require significant management judgment or estimation. Instruments that are included in this category generally include certain commercial mortgage loans, certain private equity investments, distressed debt, non-investment grade residual interests in securitizations, as well as certain highly structured OTC derivative contracts.

The results of the fair value hierarchy as of December 31, 2016, are as follows:

	Fair Value Measurements Using
	Carrying Value		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Observable Inputs (Level 2)		Significant Other Unobservable Inputs (Level 3)
(dollars in thousands)
Financial Instruments Measured at Fair Value on a Recurring Basis — Securities AFS
U.S. Treasury	$	2,000	$	—	$	2,000	$	—
U.S. Government Agency Sponsored Enterprises		24,952		—		24,952		—
SBA Backed Securities		57,767		—		57,767		—
U.S. Government Agency and Sponsored Enterprises Mortgage-Backed Securities		243,325		—		243,325		—
Privately Issued Residential Mortgage-Backed Securities		1,109		—		1,109		—
Obligations Issued by States and Political Subdivisions		164,876		—		—		164,876
Other Debt Securities		4,924		—		4,924		—
Equity Securities		344		344		—		—
Total	$	499,297	$	344	$	334,077	$	164,876
Financial Instruments Measured at Fair Value on a Non-recurring Basis
Impaired Loans	$	260	$	—	$	—	$	260

Impaired loan balances in the table above represent those collateral dependent loans where management has estimated the credit loss by comparing the loan’s carrying value against the expected realizable fair value of the collateral. Fair value is generally determined through a review process that includes independent appraisals, discounted cash flows, or other external assessments of the underlying collateral, which generally include various Level 3 inputs which are not identifiable. The Company discounts the fair values, as appropriate, based on management’s observations of the local real estate market for loans in this category.

Appraisals, discounted cash flows and real estate tax assessments are reviewed quarterly. There is no specific policy regarding how frequently appraisals will be updated. Adjustments are made to appraisals and real estate tax assessments based on management’s estimate of changes in real estate values. Within the past twelve months there have been no updated appraisals, however, all impaired loans have been reviewed during the past quarter using either a discounted cash flow analysis or other type of real estate tax assessment. The types of adjustments that are made to specific provisions (credits) relate to impaired loans recognized for 2016 for the estimated credit loss amounted to ($135,000).

There were no transfers between level 1, 2 and 3 for the year ended December 31, 2016. There were no liabilities measured at fair value on a recurring or nonrecurring basis during the year ended December 31, 2016.

The following table presents additional information about assets measured at fair value on a recurring and nonrecurring basis for which the Company has utilized Level 3 inputs to determine fair value (dollars in thousands) at December 31, 2016. Management continues to monitor the assumptions used to value the assets listed below.

Asset	Fair Value		Valuation Technique	Unobservable Input	Unobservable Input Value or Range
Securities AFS(1)	$	164,876	Discounted cash flow	Discount rate	0%-1%(2)
Impaired Loans		260	Appraisal of collateral(3)	Appraisal adjustments(4)	0%-30% discount

(1) Municipal securities generally have maturities of one year or less and, therefore, the amortized cost equates to the fair value.

(2) Weighted averages.

(3) Fair value is generally determined through independent appraisals of the underlying collateral, which generally include various Level 3 inputs which are not identifiable.

(4) Appraisals may be adjusted by management for qualitative factors such as economic conditions and estimated expenses.

The changes in Level 3 securities for the year ended December 31, 2016 are as shown in the table below:

	Auction Rate Securities		Obligations Issued by States and Political Subdivisions			Equity Securities			Total
(dollars in thousands)
Balance at December 31, 2015	$	3,820	$	153,140		$	37		$	156,997
Purchases		—		216,646			—			216,646
Maturities/redemptions		—		(208,990	)		(37	)		(209,027	)
Amortization		—		(218	)		—			(218	)
Change in fair value		478		—			—			478
Balance at December 31, 2016	$	4,298	$	160,578		$	—		$	164,876

The amortized cost of Level 3 securities was $165,281,000 with an unrealized loss of $405,000 at December 31, 2016. The securities in this category are generally equity investments, municipal securities with no readily determinable fair value or failed auction rate securities. Management evaluated the fair value of these securities based on an evaluation of the underlying issuer, prevailing rates and market liquidity.

The results of the fair value hierarchy as of December 31, 2015, are as follows:

	Fair Value Measurements Using
	Carrying Value		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Observable Inputs (Level 2)		Significant Other Unobservable Inputs (Level 3)
(dollars in thousands)
Financial Instruments Measured at Fair Value on a Recurring Basis — Securities AFS
U.S. Treasury	$	1,989	$	—	$	1,989	$	—
SBA Backed Securities		5,989		—		5,989		—
U.S. Government Agency and Sponsored Enterprises Mortgage-Backed Securities		233,526		—		233,526		—
Privately Issued Residential Mortgage-Backed Securities		1,434		—		1,434		—
Obligations Issued by States and Political Subdivisions		156,960		—		—		156,960
Other Debt Securities		4,473		—		4,473		—
Equity Securities		252		215		—		37
Total	$	404,623	$	215	$	247,411	$	156,997
Financial Instruments Measured at Fair Value on a Non-recurring Basis
Impaired Loans	$	1,056	$	—	$	—	$	1,056

Appraisals, discounted cash flows and real estate tax assessments are reviewed quarterly. There is no specific policy regarding how frequently appraisals will be updated. Adjustments are made to appraisals and real estate tax assessments based on management’s estimate of changes in real estate values. Within the past twelve months there have been no updated appraisals, however, all impaired loans have been reviewed during the past quarter using either a discounted cash flow analysis or other type of real estate tax assessment. The types of adjustments that are made to specific provisions (credits) relate to impaired loans recognized for 2015 for the estimated credit loss amounted to ($165,000).

There were no transfers between level 1 and 2 for the year ended December 31, 2015. There were no liabilities measured at fair value on a recurring or nonrecurring basis during the year ended December 31, 2015.

The following table presents additional information about assets measured at fair value on a recurring and nonrecurring basis for which the Company has utilized Level 3 inputs to determine fair value (dollars in thousands) at December 31, 2015. Management continues to monitor the assumptions used to value the assets listed below.

Asset	Fair Value		Valuation Technique	Unobservable Input	Unobservable Input Value or Range
Securities AFS(1)	$	156,997	Discounted cash flow	Discount rate	0%-1%(2)
Impaired Loans		1,056	Appraisal of collateral(3)	Appraisal adjustments(4)	0%-30% discount

⁽¹⁾ Municipal securities generally have maturities of one year or less and, therefore, the amortized cost equates to the fair value.

⁽²⁾ Weighted averages.

⁽³⁾ Fair value is generally determined through independent appraisals of the underlying collateral, which generally include various Level 3 inputs which are not identifiable.

⁽⁴⁾ Appraisals may be adjusted by management for qualitative factors such as economic conditions and estimated expenses.

The changes in Level 3 securities for the year ended December 31, 2015 are as shown in the table below:

	Auction Rate Securities		Obligations Issued by  States and Political Subdivisions			Equity Securities			Total
(dollars in thousands)
Balance at December 31, 2014	$	3,820	$	92,964		$	102		$	96,886
Purchases		—		207,509			—			207,509
Maturities/redemptions		—		(147,277	)		(65	)		(147,342	)
Amortization		—		(56	)		—			(56	)
Change in fair value		—		—			—			—
Balance at December 31, 2015	$	3,820	$	153,140		$	37		$	156,997

The amortized cost of Level 3 securities was $157,874,000 with an unrealized loss of $877,000 at December 31, 2015. The securities in this category are generally equity investments, municipal securities with no readily determinable fair value or failed auction rate securities. Management evaluated the fair value of these securities based on an evaluation of the underlying issuer, prevailing rates and market liquidity.

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Deposits

12 Months Ended

Dec. 31, 2016

Banking and Thrift [Abstract]

Deposits

10.     Deposits

The following is a summary of remaining maturities or re-pricing of time deposits as of December 31,

	2016		Percent			2015		Percent
(dollars in thousands)
Within one year	$	262,406		55	%	$	315,559		67	%
Over one year to two years		87,952		18	%		44,838		9	%
Over two years to three years		83,067		17	%		49,538		10	%
Over three years to five years		44,934		10	%		63,491		14	%
Total	$	478,359		100	%	$	473,426		100	%

Time deposits of more than $250,000 totaled $250,476,000 and $193,598,000 in 2016 and 2015, respectively.

Deposits totaling $26,191,000 and $21,970,000 were attributable to related parties at December 31, 2016 and December 31, 2015, respectively.

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Securities Sold Under Agreements to Repurchase

12 Months Ended

Dec. 31, 2016

Brokers and Dealers [Abstract]

Securities Sold Under Agreements to Repurchase

11.     Securities Sold Under Agreements to Repurchase

The following is a summary of securities sold under agreements to repurchase as of December 31,

	2016			2015			2014
(dollars in thousands)
Amount outstanding at December 31	$	182,280		$	197,850		$	212,360
Weighted average rate at December 31		0.21	%		0.21	%		0.18	%
Maximum amount outstanding at any month end	$	241,110		$	299,890		$	243,750
Daily average balance outstanding during the year	$	222,956		$	245,276		$	216,937
Weighted average rate during the year		0.21	%		0.20	%		0.18	%

Amounts outstanding at December 31, 2016, 2015 and 2014 carried maturity dates of the next business day. U.S. Government Sponsored Enterprise securities with a total amortized cost of $183,829,000, $199,152,000, and $213,817,000 were pledged as collateral and held by custodians to secure the agreements at December 31, 2016, 2015 and 2014, respectively. The approximate fair value of the collateral at those dates was $182,074,000, $197,318,000, and $212,255,000, respectively.

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Other Borrowed Funds and Subordinated Debentures

12 Months Ended

Dec. 31, 2016

Banking and Thrift [Abstract]

Other Borrowed Funds and Subordinated Debentures

12.     Other Borrowed Funds and Subordinated Debentures

The following is a summary of other borrowed funds and subordinated debentures as of December 31,

	2016			2015			2014
(dollars in thousands)
Amount outstanding at December 31	$	329,083		$	404,083		$	431,583
Weighted average rate at December 31		2.39	%		2.29	%		1.91	%
Maximum amount outstanding at any month end	$	467,083		$	521,583		$	431,583
Daily average balance outstanding during the year	$	357,974		$	374,109		$	271,710
Weighted average rate during the year		2.48	%		2.38	%		3.34	%

FEDERAL HOME LOAN BANK BORROWINGS

Federal Home Loan Bank of Boston (“FHLBB”) borrowings are collateralized by a blanket pledge agreement on the Bank’s FHLBB stock, certain qualified investment securities, deposits at the FHLBB and residential mortgages held in the Bank’s portfolios. The Bank’s remaining term borrowing capacity at the FHLBB at December 31, 2016, was approximately $239,163,000. In addition, the Bank has a $14,500,000 line of credit with the FHLBB. A schedule of the maturity distribution of FHLBB advances with the weighted average interest rates is as follows:

	2016					2015					2014
December 31,	Amount		Weighted Average Rate			Amount		Weighted Average Rate			Amount		Weighted Average Rate
(dollars in thousands)
Within one year	$	77,500		2.21	%	$	100,000		1.89	%	$	169,500		0.51	%
Over one year to two years	$	54,500		2.25	%	$	57,500		2.72	%	$	55,000		3.07	%
Over two years to three years	$	58,000		1.87	%	$	54,500		2.25	%	$	45,000		3.18	%
Over three years to five years	$	58,000		2.68	%	$	91,000		1.85	%	$	70,000		2.43	%
Over five years	$	45,000		2.85	%	$	65,000		3.23	%	$	56,000		3.16	%
Total	$	293,000		2.34	%	$	368,000		2.30	%	$	395,500		1.89	%

Included in the table above are $45,000,000, $55,000,000 and $35,000,000 respectively, of FHLBB advances at December 31, 2016, 2015 and 2014, that are putable at the discretion of FHLBB. These put dates were not utilized in the table above.

SUBORDINATED DEBENTURES

In December 2004, the Company consummated the sale of a trust preferred securities offering, in which it issued $36,083,000 of subordinated debt securities due 2034 to its newly formed unconsolidated subsidiary Century Bancorp Capital Trust II.

Century Bancorp Capital Trust II then issued 35,000 shares of Cumulative Trust Preferred Securities with a liquidation value of $1,000 per share. These securities paid dividends at an annualized rate of 6.65% for the first ten years and then converted to the three-month LIBOR rate plus 1.87% for the remaining 20 years. The coupon rate on these securities was 2.83% at December 31, 2016.

OTHER BORROWED FUNDS

There were no overnight federal funds purchased at December 31, 2016 and 2015.

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Reclassifications Out of Accumulated Other Comprehensive Income

12 Months Ended

Dec. 31, 2016

Text Block [Abstract]

Reclassifications Out of Accumulated Other Comprehensive Income

13.     Reclassifications Out of Accumulated Other Comprehensive Income(a)

	Amount Reclassified from Accumulated Other Comprehensive Income
Details about Accumulated Other Comprehensive Income Components	Year ended December 31, 2016(a)			Year ended December 31, 2015(a)			Affected line item in the Statement Where Net Income is Presented
Unrealized gains and losses on available-for-sale securities	$	52		$	594		Net gains on sales of investments
		(20	)		(233	)	Provision for income taxes
	$	32		$	361		Net income
Accretion of unrealized losses transferred	$	(4,317	)	$	(5,502	)	Securities held-to-maturity
		1,505			1,919		Provision for income taxes
	$	(2,812	)	$	(3,583	)	Net income
Amortization of defined benefit pension items
Prior-service costs	$	(10	)	$	(10	)	Salaries and employee benefits(b)
Actuarial gains (losses)		(1,606	)		(1,411	)	Salaries and employee benefits(b)
Total before tax		(1,616	)		(1,421	)	Income before taxes
Tax (expense) or benefit		646			568		Provision for income taxes
Net of tax	$	(970	)	$	(853	)	Net income

^(a) Amounts in parentheses indicate decreases to profit/loss.

^(b) These accumulated other comprehensive income components are included in the computation of net periodic pension cost (see employee benefits footnote (Note 17) for additional details).

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Earnings per share ("EPS")

12 Months Ended

Dec. 31, 2016

Earnings Per Share [Abstract]

Earnings per share ("EPS")

14.     Earnings per share (“EPS”)

Class A and Class B shares participate equally in undistributed earnings. Under the Company’s Articles of Organization, the holders of Class A Common Stock are entitled to receive dividends per share equal to at least 200% of dividends paid, if any, from time to time, on each share of Class B Common Stock.

Diluted EPS includes the dilutive effect of common stock equivalents; basic EPS excludes all common stock equivalents. The only common stock equivalents for the Company are the stock options discussed below. The dilutive effect of these stock options for 2016, 2015 and 2014 was an increase of 0, 0, and 1,447 shares, respectively.

The following table is a reconciliation of basic EPS and diluted EPS:

Year Ended December 31,	2016		2015		2014
(in thousands except share and per share data)
BASIC EPS COMPUTATION
Numerator:
Net income, Class A	$	19,270	$	18,081	$	17,157
Net income, Class B		5,264		4,940		4,703
Denominator:
Weighted average shares outstanding, Class A		3,600,729		3,600,729		3,591,732
Weighted average shares outstanding, Class B		1,967,180		1,967,180		1,969,030
Basic EPS, Class A	$	5.35	$	5.02	$	4.78
Basic EPS, Class B	$	2.68	$	2.51	$	2.39
DILUTED EPS COMPUTATION
Numerator:
Net income, Class A	$	19,270	$	18,081	$	17,157
Net income, Class B		5,264		4,940		4,703
Total net income, for diluted EPS, Class A computation		24,534		23,021		21,860
Denominator:
Weighted average shares outstanding, basic, Class A		3,600,729		3,600,729		3,591,732
Weighted average shares outstanding, Class B		1,967,180		1,967,180		1,969,030
Dilutive effect of Class A stock options		—		—		1,447
Weighted average shares outstanding diluted, Class A		5,567,909		5,567,909		5,562,209
Weighted average shares outstanding, Class B		1,967,180		1,967,180		1,969,030
Diluted EPS, Class A	$	4.41	$	4.13	$	3.93
Diluted EPS, Class B	$	2.68	$	2.51	$	2.39

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Stockholders' Equity

12 Months Ended

Dec. 31, 2016

Equity [Abstract]

Stockholders' Equity

15.     Stockholders’ Equity

DIVIDENDS

Holders of the Class A common stock may not vote in the election of directors but may vote as a class to approve certain extraordinary corporate transactions. Holders of Class B common stock may vote in the election of directors. Class A common stockholders are entitled to receive dividends per share equal to at least 200% per share of that paid, if any, on each share of Class B common stock. Class A common stock is publicly traded. Class B common stock is not publicly traded; however, it can be converted on a per share basis to Class A common stock at any time at the option of the holder. Dividend payments by the Company are dependent in part on the dividends it receives from the Bank, which are subject to certain regulatory restrictions.

STOCK OPTION PLAN

During 2000 and 2004, common stockholders of the Company approved stock option plans (the “Option Plans”) that provide for granting of options for not more than 150,000 shares of Class A common stock per plan. Under the Option Plans, all officers and key employees of the Company are eligible to receive nonqualified and incentive stock options to purchase shares of Class A common stock. The Option Plans are administered by the Compensation Committee of the Board of Directors, whose members are ineligible to participate in the Option Plans. Based on management’s recommendations, the Committee submits its recommendations to the Board of Directors as to persons to whom options are to be granted, the number of shares granted to each, the option price (which may not be less than 85% of the fair market value for nonqualified stock options, or the fair market value for incentive stock options, of the shares on the date of grant) and the time period over which the options are exercisable (not more than ten years from the date of grant). There were no options outstanding at December 31, 2016 and December 31, 2015.

Stock option activity under the plan is as follows:

	December 31, 2016				December 31, 2015				December 31, 2014
	Amount		Weighted Average Exercise Price		Amount		Weighted Average Exercise Price		Amount			Weighted Average Exercise Price
Shares under option:
Outstanding at beginning of year		—	$	—		—	$	—		20,375		$	31.82
Forfeited		—		—		—		—		(9,050	)		31.83
Exercised		—		—		—		—		(11,325	)		31.81
Outstanding at end of year		—	$	—		—	$	—		—		$	—
Exercisable at end of year		—	$	—		—	$	—		—		$	—
Available to be granted at end of year		233,934				233,934				233,934

The weighted average intrinsic value of options exercised for the period ended December 31, 2014, was $8.76 per share with an aggregate value of $99,217.

CAPITAL RATIOS

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

Quantitative measures established by regulation to ensure capital adequacy require the Bank and the Company to maintain minimum amounts and ratios (set forth in the table below) of total and Tier 1 capital (as defined in the regulation) to risk-weighted assets (as defined) and Tier 1 capital (as defined) to average assets (as defined). Management believes, as of December 31, 2016, that the Bank and the Company meet all capital adequacy requirements to which they are subject.

The Basel Committee has issued capital standards entitled “Base III: A global framework for more resilient banks and banking systems” (Basel III). The Federal Reserve has finalized its rule implementing the Basel III regulatory capital framework. The rule was effective in January 2015 and sets the Basel III minimum Regulatory capital requirements. To be categorized as well capitalized, the Bank must maintain minimum total risk-based, Common Equity tier 1, tier 1 risk-based, and Tier 1 leverage ratios as set forth in the table. There are no conditions or events since that notification that management believes would cause a change in the Bank’s categorization.

The Bank’s actual capital amounts and ratios are presented in the following table:

	Actual					For  Capital Adequacy Purposes					To Be Well Capitalized Under Prompt Corrective Action Provisions
	Amount		Ratio			Amount		Ratio			Amount		Ratio
As of December 31, 2016
Total Capital (to Risk-Weighted Assets)	$	293,143		12.27	%	$	191,081		8.00	%	$	238,851		10.00	%
Tier 1 Capital (to Risk-Weighted Assets)		268,737		11.25	%		143,311		6.00	%		191,081		8.00	%
Common Equity Tier 1 Capital (to Risk-Weighted Assets)		268,737		11.25	%		107,483		4.50	%		155,253		6.50	%
Tier 1 Capital (to 4th Qtr. Average Assets)		268,737		6.02	%		178,469		4.00	%		223,086		5.00	%
As of December 31, 2015
Total Capital (to Risk-Weighted Assets)	$	278,769		12.03	%	$	185,320		8.00	%	$	231,650		10.00	%
Tier 1 Capital (to Risk-Weighted Assets)		255,694		11.04	%		138,990		6.00	%		185,320		8.00	%
Common Equity Tier 1 Capital (to Risk-Weighted Assets)		255,694		11.04	%		104,242		4.50	%		150,572		6.50	%
Tier 1 Capital (to 4th Qtr. Average Assets)		255,964		6.48	%		157,734		4.00	%		197,167		5.00	%

The Company’s actual capital amounts and ratios are presented in the following table:

	Actual					For Capital Adequacy Purposes					To Be Well Capitalized Under Prompt Corrective Action Provisions
	Amount		Ratio			Amount		Ratio			Amount		Ratio
As of December 31, 2016
Total Capital (to Risk-Weighted Assets)	$	305,065		12.72	%	$	191,904		8.00	%	$	239,880		10.00	%
Tier 1 Capital (to Risk-Weighted Assets)		280,659		11.70	%		143,928		6.00	%		191,904		8.00	%
Common Equity Tier 1 Capital (to Risk-Weighted Assets)		249,753		10.41	%		107,946		4.50	%		155,922		6.50	%
Tier 1 Capital (to 4th Qtr. Average Assets)		280,659		6.28	%		178,903		4.00	%		223,628		5.00	%
As of December 31, 2015
Total Capital (to Risk-Weighted Assets)	$	291,635		12.54	%	$	186,021		8.00	%	$	232,526		10.00	%
Tier 1 Capital (to Risk-Weighted Assets)		268,560		11.55	%		139,515		6.00	%		186,021		8.00	%
Common Equity Tier 1 Capital (to Risk-Weighted Assets)		233,560		10.04	%		104,637		4.50	%		151,142		6.50	%
Tier 1 Capital (to 4th Qtr. Average Assets)		268,560		6.79	%		158,114		4.00	%		197,642		5.00	%

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Income Taxes

12 Months Ended

Dec. 31, 2016

Income Tax Disclosure [Abstract]

Income Taxes

16.     Income Taxes

The current and deferred components of income tax (benefit) expense for the years ended December 31, are as follows:

	2016			2015			2014
(dollars in thousands)
Current expense:
Federal	$	3,875		$	3,393		$	3,981
State		439			399			498
Total current expense		4,314			3,792			4,479
Deferred (benefit) expense:
Federal		(4,450	)		(3,098	)		(3,179	)
State		(334	)		(161	)		(434	)
Valuation allowance		108			—			—
Total deferred benefit		(4,676	)		(3,259	)		(3,613	)
Provision for income taxes	$	(362	)	$	533		$	866

Income tax accounts included in other assets at December 31, are as follows:

	2016		2015
(dollars in thousands)
Currently receivable	$	633	$	1,217
Deferred income tax asset, net		43,129		40,157
Total	$	43,762	$	41,374

Differences between income tax (benefit) expense at the statutory federal income tax rate and total income tax expense are summarized as follows:

	2016			2015			2014
(dollars in thousands)
Federal income tax expense at statutory rates	$	8,218		$	8,008		$	7,727
State income tax, net of federal income tax benefit		69			157			42
Insurance income		(406	)		(375	)		(353	)
Effect of tax-exempt interest		(8,259	)		(6,915	)		(6,097	)
Net tax credit		(395	)		(460	)		(517	)
Valuation allowance		108			—			—
Other		303			118			64
Total	$	(362	)	$	533		$	866
Effective tax rate		(1.50	)%		2.30	%		3.80	%

The following table sets forth the Company’s gross deferred income tax assets and gross deferred income tax liabilities at December 31:

	2016			2015
(dollars in thousands)
Deferred income tax assets:
Allowance for loan losses	$	10,419		$	9,852
AMT credit		10,234			7,041
Deferred compensation		9,684			8,495
Pension and SERP liability		7,658			8,714
Unrealized losses on securities transferred to held-to-maturity		3,161			4,667
Depreciation		968			673
Accrued bonus		612			508
Unrealized (gains) losses on securities available-for-sale		357			108
Charitable contributions carryforward		266			—
Acquisition premium		128			231
Nonaccrual interest		125			138
Limited partnerships		30			52
Investments write down		26			26
Other		220			173
Gross deferred income tax asset		43,888			40,678
Valuation allowance		(108	)		—
Gross deferred income tax asset,net of valuation allowance		43,780			40,678
Deferred income tax liabilities:
Mortgage servicing rights		(651	)		(521	)
Gross deferred income tax liability		(651	)		(521	)
Deferred income tax asset net	$	43,129		$	40,157

Based on the Company’s historical and current pre-tax earnings, management believes it is more likely than not that the Company will realize the deferred income tax asset existing at December 31, 2016, with the exception of a $108,000 valuation allowance on a charitable contribution carryforward that has a remaining carryforward period of four years. Management believes that existing net deductible temporary differences which give rise to the deferred tax asset will reverse during periods in which the Company generates net taxable income. In addition, gross deductible temporary differences are expected to reverse in periods during which offsetting gross taxable temporary differences are expected to reverse. Factors beyond management’s control, such as the general state of the economy and real estate values, can affect future levels of taxable income, and no assurance can be given that sufficient taxable income will be generated to fully absorb gross deductible temporary differences. The Company is in an Alternative Minimum Tax (“AMT”) credit position. The AMT credit is carried as a deferred asset and has an indefinite life. The Company’s intent is not to perpetually remain an AMT taxpayer and has potential tax planning strategies available which support the deferred AMT credit and, at this time, no valuation allowance is needed. The Company and its subsidiaries file a consolidated federal tax return. The Company is subject to federal examinations for tax years after December 31, 2013, and state examinations for the tax years after December 31, 2012.

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Employee Benefits

12 Months Ended

Dec. 31, 2016

Compensation and Retirement Disclosure [Abstract]

Employee Benefits

17. Employee Benefits

The Company has a Qualified Defined Benefit Pension Plan (the “Plan”), which had been offered to all employees reaching minimum age and service requirements. In 2006, the Bank became a member of the Savings Bank Employees Retirement Association (“SBERA”) within which it then began maintaining the Qualified Defined Benefit Pension Plan. SBERA offers a common and collective trust as the underlying investment structure for its retirement plans. The target allocation mix for the common and collective trust portfolio calls for an equity-based investment deployment range of 40% to 64% of total portfolio assets. The remainder of the portfolio is allocated to fixed income securities with target range of 15% to 25% and other investments including global asset allocation and hedge funds from 20% to 36%.

The Trustees of SBERA, through its Investment Committee, select investment managers for the common and collective trust portfolio. A professional investment advisory firm is retained by the Investment Committee to provide allocation analysis, performance measurement and to assist with manager searches. The overall investment objective is to diversify investments across a spectrum of investment types to limit risks from large market swings. The Company closed the plan to employees hired after March 31, 2006.

The measurement date for the Plan is December 31 for each year. The benefits expected to be paid in each year from 2017 to 2021 are $1,457,000, $1,481,000, $1,516,000, $1,671,000, and $1,863,000, respectively. The aggregate benefits expected to be paid in the five years from 2022 to 2026 are $10,650,000. The Company plans to contribute $1,000,000 to the Plan in 2017.

The fair value of plan assets and major categories as of December 31, 2016, is as follows:

Asset Category	Percent			Total		Level 1		Level 2		Level 3
(dollars in thousands)
Collective fund		59.3	%	$	22,209	$	4,708	$	17,501	$	—
Equity securities		19.7	%		7,363		7,363		—		—
Mutual funds		12.3	%		4,615		4,615		—		—
Hedge funds		7.4	%		2,786		—		—		2,786
Short-term investments		1.3	%		474		474		—		—
		100.0	%	$	37,447	$	17,160	$	17,501	$	2,786

The fair value of plan assets and major categories as of December 31, 2015, is as follows:

Asset Category	Percent			Total		Level 1		Level 2		Level 3
(dollars in thousands)
Collective fund		61.20	%	$	20,627	$	4,307	$	16,320	$	—
Equity securities		17.70	%		5,990		5,990		—		—
Mutual funds		11.90	%		4,001		4,001		—		—
Hedge funds		7.50	%		2,524		—		—		2,524
Short-term investments		1.70	%		575		575		—		—
		100.00	%	$	33,717	$	14,873	$	16,320	$	2,524

LEVEL 1

The plan assets measured at fair value in Level 1 are based on quoted market prices in an active exchange market.

LEVEL 2

Plan assets measured at fair value in Level 2 are based on pricing models that consider standard input factors, such as observable market data, benchmark yields, interest rate volatilities, broker/dealer quotes, credit spreads and new issue data.

LEVEL 3

Plan assets measured at fair value in Level 3 are based on unobservable inputs, which includes SBERA’s assumptions and the best information available under the circumstance. Level 3 assets consist of hedge funds. The underlying assets are valued based upon quoted exchange prices, over-the-counter trades, bid/ask prices, relative value assessments based on market conditions, and other information, as available. Further adjustments may be made based on factors impacting liquidity.

The asset or liability’s fair value measurement level within fair value hierarchy is based on the lowest level of any input that is significant to the fair value measurement. Valuation techniques used need to maximize the use of observable inputs and minimize the use of unobservable inputs. Below is a description of the valuation methodologies used for assets measured at fair value.

The Trust reports bonds and other obligations, short-term investments and equity securities at fair values based on published quotations, Collective funds and hedge funds (Funds) are valued in accordance with valuations provided by such Funds, which generally value marketable securities at the last reported sales price on the valuation date and other investments at fair value, as determined by each Fund’s manager.

The preceding methods described may produce a fair value calculation that may not be indicative of net realizable value or reflective of future values. Furthermore, although the Trust believes its valuation methods are appropriate and consistent with other market participants, the use of different methodologies to determine the fair value of certain financial instruments could result in a different fair value measurement at the reporting date.

The changes in Level 3 securities are shown in the table below:

Year Ended December 31,	2016			2015
(dollars in thousands)
Balance at beginning of year	$	2,524		$	2,360
Purchases		114			224
Redemptions		(309	)		(40	)
Actual return – assets still being held		457			(20	)
Balance at end of year	$	2,786		$	2,524

There were no transfers in or out of level 3 during the year ended December 31, 2016 and 2015.

The performance of the plan assets is dependent upon general market conditions and specific conditions related to the issuers of the underlying securities.

The Company has a Supplemental Executive Insurance/Retirement Plan (the Supplemental Plan), which is limited to certain officers and employees of the Company. The Supplemental Plan is voluntary. Under the Supplemental Plan, each participant will receive a retirement benefit based on compensation and length of service. Life insurance policies, which are owned by the Company, are purchased covering the lives of each participant.

The benefits expected to be paid in each year from 2017 to 2021 are $2,031,000, $1,990,000, $1,964,000, $1,906,000 and $1,830,000, respectively. The aggregate benefits expected to be paid in the five years from 2022 to 2026 are $11,972,000.

	Defined Benefit Pension Plan						Supplemental Insurance/ Retirement Plan
	2016			2015			2016			2015
(dollars in thousands)
Change projected in benefit obligation
Benefit obligation at beginning of year	$	38,597		$	40,011		$	38,204		$	31,989
Service cost		1,273			1,343			1,820			1,589
Interest cost		1,358			1,576			1,334			1,365
Actuarial (gain)/loss		2,593			(3,424	)		(1,653	)		4,304
Benefits paid		(1,566	)		(909	)		(1,095	)		(1,043	)
Projected benefit obligation at end of year	$	42,255		$	38,597		$	38,610		$	38,204
Change in plan assets
Fair value of plan assets at beginning of year	$	33,717		$	33,812
Actual return on plan assets		3,221			(1,186	)
Employer contributions		2,075			2,000
Benefits paid		(1,566	)		(909	)
Fair value of plan assets at end of year	$	37,447		$	33,717
(Unfunded) Funded status	$	(4,808	)	$	(4,880	)	$	(38,610	)	$	(38,204	)
Accumulated benefit obligation	$	42,255		$	38,597		$	36,392		$	34,884
Weighted-average assumptions as of December 31
Discount rate — Liability		3.99	%		4.18	%		3.85	%		4.03	%
Discount rate — Expense		4.18	%		4.00	%		4.01	%		4.00	%
Expected return on plan assets		8.00	%		8.00	%		NA			NA
Rate of compensation increase		4.00	%		4.00	%		4.00	%		4.00	%
Components of net periodic benefit cost
Service cost	$	1,273		$	1,343		$	1,820		$	1,589
Interest cost		1,358			1,576			1,334			1,365
Expected return on plan assets		(2,776	)		(2,749	)		—			—
Recognized prior service cost		(104	)		(104	)		114			114
Recognized net losses		801			812			805			599
Net periodic cost (benefit)	$	552		$	878		$	4,073		$	3,667
Other changes in plan assets and benefit obligations recognized in other comprehensive income
Amortization of prior service cost	$	104		$	104		$	(114	)	$	(114	)
Net (gain) loss		1,347			(301	)		(2,458	)		3,705
Total recognized in other comprehensive income		1,451			(197	)		(2,572	)		3,591
Total recognized in net periodic benefit cost and other comprehensive income	$	2,003		$	681		$	1,501		$	7,258

	December 31, 2016									December 31, 2015
	Plan			Supplemental Plan			Total			Plan			Supplemental Plan			Total
(dollars in thousands)
Prior service cost	$	204		$	(649	)	$	(445	)	$	308		$	(763	)	$	(455	)
Net actuarial loss		(13,999	)		(13,416	)		(27,415	)		(12,652	)		(15,874	)		(28,526	)
Total	$	(13,795	)	$	(14,065	)	$	(27,860	)	$	(12,344	)	$	(16,637	)	$	(28,981	)

The following table summarizes the amounts included in Accumulated Other Comprehensive Loss at December 31, 2016, expected to be recognized as components of net periodic benefit cost in the next year:

	Plan			Supplemental Plan
Amortization of prior service cost to be recognized in 2017	$	(104	)	$	114
Amortization of loss to be recognized in 2017		903			636

Assumptions for the expected return on plan assets and discount rates in the Company’s Plan and Supplemental Plan are periodically reviewed. As part of the review, management in consultation with independent consulting actuaries performs an analysis of expected returns based on the plan’s asset allocation. This forecast reflects the Company’s and actuarial firm’s expected return on plan assets for each significant asset class or economic indicator. The range of returns developed relies on forecasts and on broad market historical benchmarks for expected return, correlation and volatility for each asset class. Also, as a part of the review, the Company’s management in consultation with independent consulting actuaries performs an analysis of discount rates based on expected returns of high-grade fixed income debt securities.

Effective January 1, 2016, the Company changed its estimate of the service and interest components of the net periodic benefit cost. Previously, the Company estimated the service and interest cost components utilizing a single weighted-average discount rate derived from the yield curve used to measure the benefit obligation. The new estimate utilizes a full yield curve approach in the estimation of these components by applying the specific spot rates along the yield curve used in the determination of the benefit obligation to their underlying projected cash flows. The new estimate provided a more precise measurement of service and interests costs by improving the correlation between projected benefit cash flows and their corresponding spot rates. The change does not affect the measurement of the Company’s benefit obligations and it is accounted for as a change in accounting estimate, which is applied prospectively. For 2016, the change in estimate reduced periodic plan cost by $859,000 compared to the prior estimate. Mortality assumptions are based on the RP 2015 Mortality Table projected with Scale MP 2016.

The Company offers a 401(k) defined contribution plan for all employees reaching minimum age and service requirements. The plan is voluntary and employee contributions are matched by the Company at a rate of 33.3% for the first 6% of compensation contributed by each employee. The Company’s match totaled $418,000 for 2016, $403,000 for 2015 and $346,000 for 2014. Administrative costs associated with the plan are absorbed by the Company.

The Company has a cash incentive plan that is designed to reward our executives and officers for the achievement of annual financial performance goals of the Company as well as business line, department and individual performance. The plan supports the philosophy that management be measured for their performance as a team in the attainment of these goals. Discretionary bonus expense amounted to $1,418,000, $1,178,000 and $1,434,000 in 2016, 2015, and 2014, respectively.

The Company does not offer any postretirement programs other than pensions.

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Commitments and Contingencies

12 Months Ended

Dec. 31, 2016

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingencies

18.    Commitments and Contingencies

A number of legal claims against the Company arising in the normal course of business were outstanding at December 31, 2016. Management, after reviewing these claims with legal counsel, is of the opinion that their resolution will not have a material adverse effect on the Company’s consolidated financial position or results of operations.

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Financial Instruments with Off-Balance-Sheet Risk

12 Months Ended

Dec. 31, 2016

Risks and Uncertainties [Abstract]

Financial Instruments with Off-Balance-Sheet Risk

19.    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. Financial instruments with off-balance-sheet risk at December 31 are as follows:

Contract or Notional Amount

	2016		2015
(dollars in thousands)
Financial instruments whose contract amount represents credit risk:
Commitments to originate 1–4 family mortgages	$	13,877	$	5,638
Standby and commercial letters of credit		6,796		4,936
Unused lines of credit		362,357		320,874
Unadvanced portions of construction loans		22,049		11,589
Unadvanced portions of other loans		52,224		41,717

Commitments to originate loans, unadvanced portions of construction loans, unused lines of credit and unused letters of credit are generally agreements to lend to a customer, provided there is no violation of any condition established in the contract. Commitments generally have fixed expiration dates or other termination clauses and may require payment of a fee. Since many of the commitments are expected to expire without being drawn upon, the total commitment amounts do not necessarily represent future cash requirements. The Company evaluates each customer’s creditworthiness on a case-by-case basis. The amount of collateral obtained, if deemed necessary by the Company upon extension of credit, is based on management’s credit evaluation of the borrower.

Standby letters of credit are conditional commitments issued by the Company to guarantee the performance by a customer to a third party. The credit risk involved in issuing letters of credit is essentially the same as that involved in extending loan facilities to customers.

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Other Operating Expenses

12 Months Ended

Dec. 31, 2016

Other Income and Expenses [Abstract]

Other Operating Expenses

20.    Other Operating Expenses

Year ended December 31,	2016		2015		2014
(dollars in thousands)
Marketing	$	2,185	$	1,849	$	1,793
Software maintenance/amortization		1,863		1,670		1,524
Legal and audit		1,255		1,269		1,072
Contributions		789		690		735
Processing services		1,040		1,002		944
Consulting		1,168		1,050		964
Postage and delivery		987		905		964
Supplies		948		965		870
Telephone		1,032		804		753
Directors’ fees		413		377		389
Insurance		323		301		304
Other		1,812		1,826		1,520
Total	$	13,815	$	12,708	$	11,832

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Fair Values of Financial Instruments

12 Months Ended

Dec. 31, 2016

Investments, All Other Investments [Abstract]

Fair Values of Financial Instruments

21.    Fair Values of Financial Instruments

The following methods and assumptions were used by the Company in estimating fair values of its financial instruments. Excluded from this disclosure are all non-financial instruments. Accordingly, the aggregate fair value amounts presented do not represent the underlying value of the Company.

The assumptions used below are expected to approximate those that market participants would use in valuing these financial instruments.

Fair value estimates are made at a specific point in time, based on available market information and judgments about the financial instrument, including estimates of timing, amount of expected future cash flows and the credit standing of the issuer. Such estimates do not consider the tax impact of the realization of unrealized gains or losses. In some cases, the fair value estimates cannot be substantiated by comparison to independent markets. In addition, the disclosed fair value may not be realized in the immediate settlement of the financial instrument. Care should be exercised in deriving conclusions about our business, its value or financial position based on the fair value information of financial instruments presented below.

SECURITIES HELD-TO-MATURITY

The fair values of these securities were based on quoted market prices, where available, as provided by third-party investment portfolio pricing vendors. If quoted market prices were not available, fair values provided by the vendors were based on quoted market prices of comparable instruments in active markets and/or based on a matrix pricing methodology which employs The Bond Market Association’s standard calculations for cash flow and price/yield analysis, live benchmark bond pricing and terms/condition data available from major pricing sources. Management regards the inputs and methods used by third party pricing vendors to be “Level 2 inputs and methods” as defined in the “fair value hierarchy” provided by FASB.

LOANS

For variable-rate loans, that reprice frequently and with no significant change in credit risk, fair values are based on carrying amounts. The fair value of other loans is estimated using discounted cash flow analysis, based on interest rates currently being offered for loans with similar terms to borrowers of similar credit quality. Incremental credit risk for nonperforming loans has been considered.

TIME DEPOSITS

The fair value of time deposits was estimated using a discounted cash flow approach that applies prevailing market interest rates for similar maturity instruments. The fair values of the Company’s time deposit liabilities do not take into consideration the value of the Company’s long-term relationships with depositors, which may have significant value.

OTHER BORROWED FUNDS

The fair value of other borrowed funds is based on the discounted value of contractual cash flows. The discount rate used is estimated based on the rates currently offered for other borrowed funds of similar remaining maturities.

SUBORDINATED DEBENTURES

The fair value of subordinated debentures is based on the discounted value of contractual cash flows. The discount rate used is estimated based on the rates currently offered for other subordinated debentures of similar remaining maturities.

The following presents (in thousands) the carrying amount, estimated fair value, and placement in the fair value hierarchy of the Company’s financial instruments as of December 31, 2016 and December 31, 2015. This table excludes financial instruments for which the carrying amount approximates fair value. Financial assets for which the fair value approximates carrying value include cash and cash equivalents, short-term investments, FHLBB stock and accrued interest receivable. Financial liabilities for which the fair value approximates carrying value include non-maturity deposits, short-term borrowings and accrued interest payable.

	Carrying Amount		Estimated Fair Value		Level 1 Inputs		Fair Value Measurements Level 2 Inputs		Level 3 Inputs
(dollars in thousands)
December 31, 2016
Financial assets:
Securities held-to-maturity	$	1,653,986	$	1,635,808	$	—	$	1,635,808	$	—
Loans(1)		1,899,527		1,873,703		—		—		1,873,703
Financial liabilities:
Time deposits		478,359		480,133		—		480,133		—
Other borrowed funds		293,000		294,940		—		294,940		—
Subordinated debentures		36,083		36,083		—		—		36,083
December 31, 2015
Financial assets:
Securities held-to-maturity	$	1,438,903	$	1,438,960	$	—	$	1,438,960	$	—
Loans(1)		1,708,461		1,677,270		—		—		1,677,270
Financial liabilities:
Time deposits		473,426		474,046		—		474,046		—
Other borrowed funds		368,000		372,209		—		372,209		—
Subordinated debentures		36,083		36,083		—		—		36,083

(1) Comprised of loans (including collateral dependent impaired loans), net of deferred loan costs and the allowance for loan losses.

LIMITATIONS

Fair value estimates are made at a specific point in time, based on relevant market information and information about the type of financial instrument. These estimates do not reflect any premium or discount that could result from offering for sale at one time the Bank’s entire holdings of a particular financial instrument. Because no active market exists for some of the Bank’s financial instruments, fair value estimates are based on judgments regarding future expected loss experience, cash flows, current economic conditions, risk characteristics and other factors. These estimates are subjective in nature and involve uncertainties and matters of significant judgment and therefore cannot be determined with precision. Changes in assumptions and changes in the loan, debt and interest rate markets could significantly affect the estimates. Further, the income tax ramifications related to the realization of the unrealized gains and losses can have a significant effect on the fair value estimates and have not been considered.

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Quarterly Results of Operations (Unaudited)

12 Months Ended

Dec. 31, 2016

Quarterly Financial Information Disclosure [Abstract]

Quarterly Results of Operations (Unaudited)

22.     Quarterly Results of Operations (unaudited)

2016 Quarters	Fourth			Third			Second		First
(in thousands, except share data)
Interest income	$	24,689		$	25,005		$	23,742	$	23,263
Interest expense		5,927			5,791			5,486		5,413
Net interest income		18,762			19,214			18,256		17,850
Provision for loan losses		200			375			350		450
Net interest income after provision for loan losses		18,562			18,839			17,906		17,400
Other operating income		3,700			4,225			4,643		3,654
Operating expenses		16,156			16,630			16,288		15,683
Income before income taxes		6,106			6,434			6,261		5,371
Provision for income taxes		(394	)		(52	)		20		64
Net income	$	6,500		$	6,486		$	6,241	$	5,307
Share data:
Average shares outstanding, basic
Class A		3,600,729			3,600,729			3,600,729		3,600,729
Class B		1,967,180			1,967,180			1,967,180		1,967,180
Average shares outstanding, diluted
Class A		5,567,909			5,567,909			5,567,909		5,567,909
Class B		1,967,180			1,967,180			1,967,180		1,967,180
Earnings per share, basic
Class A	$	1.42		$	1.41		$	1.36	$	1.16
Class B	$	0.71		$	0.71		$	0.68	$	0.58
Earnings per share, diluted
Class A	$	1.17		$	1.16		$	1.12	$	0.95
Class B	$	0.71		$	0.71		$	0.68	$	0.58
2015 Quarters	Fourth			Third			Second		First
(in thousands, except share data)
Interest income	$	22,496		$	23,750		$	22,675	$	21,172
Interest expense		5,274			5,134			4,961		4,765
Net interest income		17,222			18,616			17,714		16,407
Provision for loan losses		—			—			—		200
Net interest income after provision for loan losses		17,222			18,616			17,714		16,207
Other operating income		4,448			3,830			4,210		3,505
Operating expenses		15,794			16,100			15,766		14,538
Income before income taxes		5,876			6,346			6,158		5,174
Provision for income taxes		(95	)		180			233		215
Net income	$	5,971		$	6,166		$	5,925	$	4,959
Share data:
Average shares outstanding, basic
Class A		3,600,729			3,600,729			3,600,729		3,600,729
Class B		1,967,180			1,967,180			1,967,180		1,967,180
Average shares outstanding, diluted
Class A		5,567,909			5,567,909			5,567,909		5,567,909
Class B		1,976,180			1,967,180			1,967,180		1,967,180
Earnings per share, basic
Class A	$	1.30		$	1.35		$	1.29	$	1.08
Class B	$	0.65		$	0.67		$	0.65	$	0.54
Earnings per share, diluted
Class A	$	1.07		$	1.11		$	1.06	$	0.89
Class B	$	0.65		$	0.67		$	0.65	$	0.54

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Parent Company Financial Statements

12 Months Ended

Dec. 31, 2016

Condensed Financial Information of Parent Company Only Disclosure [Abstract]

Parent Company Financial Statements

23.     Parent Company Financial Statements

The balance sheets of Century Bancorp, Inc. (“Parent Company”) as of December 31, 2016 and 2015 and the statements of income and cash flows for each of the years in the three-year period ended December 31, 2016, are presented below. The statements of changes in stockholders’ equity are identical to the consolidated statements of changes in stockholders’ equity and are therefore not presented here.

BALANCE SHEETS

December 31,	2016		2015
(dollars in thousands)
ASSETS:
Cash	$	2,768	$	5,230
Investment in subsidiary, at equity		263,070		236,629
Other assets		10,335		8,808
Total assets	$	276,173	$	250,667
LIABILITIES AND STOCKHOLDERS’ EQUITY:
Liabilities	$	49	$	40
Subordinated debentures		36,083		36,083
Stockholders’ equity		240,041		214,544
Total liabilities and stockholders’ equity	$	276,173	$	250,667

STATEMENTS OF INCOME

Year Ended December 31,	2016			2015			2014
(dollars in thousands)
Income:
Dividends from subsidiary	$	2,000		$	1,500		$	—
Interest income from deposits in bank		3			13			21
Other income		28			24			72
Total income		2,031			1,537			93
Interest expense		937			792			2,329
Operating expenses		220			212			204
Income before income taxes and equity in undistributed income of subsidiary		874			533			(2,440	)
Benefit from income taxes		(383	)		(328	)		(830	)
Income before equity in undistributed income of subsidiary		1,257			861			(1,610	)
Equity in undistributed income of subsidiary		23,277			22,160			23,470
Net income	$	24,534		$	23,021		$	21,860

STATEMENTS OF CASH FLOWS

December 31,	2016			2015			2014
(dollars in thousands)
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$	24,534		$	23,021		$	21,860
Adjustments to reconcile net income to net cash provided by operating activities
Undistributed income of subsidiary		(23,277	)		(22,160	)		(23,470	)
Depreciation and amortization		—			3			12
Increase in other assets		(1,527	)		(1,112	)		(1,067	)
Decrease in liabilities		9			4			(71	)
Net cash (used in) operating activities		(261	)		(244	)		(2,736	)
CASH FLOWS FROM FINANCING ACTIVITIES:
Net proceeds from the exercise of stock options		—			—			361
Cash dividends paid		(2,201	)		(2,200	)		(2,196	)
Net cash used in financing activities		(2,201	)		(2,200	)		(1,835	)
Net (decrease) in cash		(2,462	)		(2,444	)		(4,571	)
Cash at beginning of year		5,230			7,674			12,245
Cash at end of year	$	2,768		$	5,230		$	7,674

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Summary of Significant Accounting Policies (Policies)

12 Months Ended

Dec. 31, 2016

Accounting Policies [Abstract]

BASIS OF FINANCIAL STATEMENT PRESENTATION

BASIS OF FINANCIAL STATEMENT PRESENTATION

The consolidated financial statements include the accounts of Century Bancorp, Inc. (the “Company”) and its wholly owned subsidiary, Century Bank and Trust Company (the “Bank”). The consolidated financial statements also include the accounts of the Bank’s wholly owned subsidiaries, Century Subsidiary Investments, Inc. (“CSII”), Century Subsidiary Investments, Inc. II (“CSII II”), Century Subsidiary Investments, Inc. III (“CSII III”) and Century Financial Services Inc. (“CFSI”). CSII, CSII II, and CSII III are engaged in buying, selling and holding investment securities. CFSI has the power to engage in financial agency, securities brokerage, and investment and financial advisory services and related securities credit. The Company also owns 100% of Century Bancorp Capital Trust II (“CBCT II”). The entity is an unconsolidated subsidiary of the Company.

All significant intercompany accounts and transactions have been eliminated in consolidation. The Company provides a full range of banking services to individual, business and municipal customers in Massachusetts, New Hampshire, Rhode Island, Connecticut and New York. As a bank holding company, the Company is subject to the regulation and supervision of the Federal Reserve Board. The Bank, a state chartered financial institution, is subject to supervision and regulation by applicable state and federal banking agencies, including the Federal Reserve Board, the Federal Deposit Insurance Corporation (the “FDIC”) and the Commonwealth of Massachusetts Commissioner of Banks. The Bank is also subject to various requirements and restrictions under federal and state law, including requirements to maintain reserves against deposits, restrictions on the types and amounts of loans that may be granted and the interest that may be charged thereon, and limitations on the types of investments that may be made and the types of services that may be offered. Various consumer laws and regulations also affect the operations of the Bank. In addition to the impact of regulation, commercial banks are affected significantly by the actions of the Federal Reserve Board as it attempts to control the money supply and credit availability in order to influence the economy. All aspects of the Company’s business are highly competitive. The Company faces aggressive competition from other lending institutions and from numerous other providers of financial services. The Company has one reportable operating segment.

The financial statements have been prepared in conformity with accounting principles generally accepted in the United States of America and general practices within the banking industry. In preparing the financial statements, management is required to make estimates and assumptions that affect the reported amounts of assets and liabilities as of the date of the balance sheet and revenues and expenses for the period. Actual results could differ from those estimates.

Material estimates that are susceptible to change in the near term relate to the allowance for loan losses. Management believes that the allowance for loan losses is adequate based on a review of factors, including historical charge-off rates with additional allocations based on qualitative risk factors for each category and general economic factors. While management uses available information to recognize loan losses, future additions to the allowance for loan losses may be necessary based on changes in economic conditions. In addition, regulatory agencies periodically review the Company’s allowance for loan losses. Such agencies may require the Company to recognize additions to the allowance for loan losses based on their judgments about information available to them at the time of their examination. Certain reclassifications are made to prior-year amounts whenever necessary to conform with the current-year presentation.

FAIR VALUE MEASUREMENTS

FAIR VALUE MEASUREMENTS

The Company follows FASB ASC 820-10, Fair Value Measurements and Disclosures, which among other things, requires enhanced disclosures about assets and liabilities carried at fair value. ASC 820-10 establishes a hierarchal disclosure framework associated with the level of pricing observability utilized in measuring financial instruments at fair value. The three broad levels of the hierarchy are as follows:

Level I — Quoted prices are available in active markets for identical assets or liabilities as of the reported date. The type of financial instruments included in Level I are highly liquid cash instruments with quoted prices, such as G-7 government, agency securities, listed equities and money market securities, as well as listed derivative instruments.

Level II — Pricing inputs are other than quoted prices in active markets, which are either directly or indirectly observable as of the reported date. The nature of these financial instruments includes cash instruments for which quoted prices are available but traded less frequently, derivative instruments whose fair value has been derived using a model where inputs to the model are directly observable in the market or can be derived principally from or corroborated by observable market data, and instruments that are fair valued using other financial instruments, the parameters of which can be directly observed. Instruments that are generally included in this category are corporate bonds and loans, mortgage whole loans, municipal bonds and over the counter (“OTC”) derivatives.

Level III — These instruments have little to no pricing observability as of the reported date. These financial instruments do not have two-way markets and are measured using management’s best estimate of fair value, where the inputs into the determination of fair value require significant management judgment or estimation. Instruments that are included in this category generally include certain commercial mortgage loans, certain private equity investments, distressed debt, and noninvestment grade residual interests in securitizations as well as certain highly structured OTC derivative contracts.

CASH AND CASH EQUIVALENTS

CASH AND CASH EQUIVALENTS

For purposes of reporting cash flows, cash equivalents include highly liquid assets with an original maturity of three months or less. Highly liquid assets include cash and due from banks, federal funds sold and certificates of deposit.

SHORT-TERM INVESTMENTS

SHORT-TERM INVESTMENTS

As of December 31, 2016 and 2015, short-term investments include highly liquid certificates of deposit with original maturities of more than 90 days but less than one year.

INVESTMENT SECURITIES

INVESTMENT SECURITIES

Debt securities that the Company has the positive intent and ability to hold to maturity are classified as held-to-maturity and reported at amortized cost; debt and equity securities that are bought and held principally for the purpose of selling are classified as trading and reported at fair value, with unrealized gains and losses included in earnings; and debt and equity securities not classified as either held-to-maturity or trading are classified as available-for-sale and reported at fair value, with unrealized gains and losses excluded from earnings and reported as a separate component of stockholders’ equity, net of estimated related income taxes. The Company has no securities held for trading.

Premiums and discounts on investment securities are amortized or accreted into income by use of the level-yield method. Gains and losses on the sale of investment securities are recognized on the trade date on a specific identification basis.

Management also considers the Company’s capital adequacy, interest-rate risk, liquidity and business plans in assessing whether it is more likely than not that the Company will sell or be required to sell the investment securities before recovery. If the Company determines that a decline in fair value is OTTI and that it is more likely than not that the Company will not sell or be required to sell the investment security before recovery of its amortized cost, the credit portion of the impairment loss is recognized in the Company’s consolidated statement of income and the noncredit portion is recognized in accumulated other comprehensive income. The credit portion of the OTTI impairment represents the difference between the amortized cost and the present value of the expected future cash flows of the investment security. If the Company determines that a decline in fair value is OTTI and it is more likely than not that it will sell or be required to sell the investment security before recovery of its amortized cost, the entire difference between the amortized cost and the fair value of the security will be recognized in the Company’s consolidated statement of income.

The transfer of a security between categories of investments shall be accounted for at fair value. For a debt security transferred into the held-to-maturity category from the available-for-sale category, the unrealized holding gain or loss at the date of the transfer shall continue to be reported in a separate component of shareholders’ equity but shall be amortized over the remaining life of the security as an adjustment of yield in a manner consistent with the amortization of any premium or discount. The amortization of an unrealized holding gain or loss reported in equity will offset or mitigate the effect on interest income of the amortization of the premium or discount for that held-to-maturity security.

The sale of a security held-to-maturity may occur after a substantial portion (at least 85%) of the principal outstanding at acquisition due either to prepayments on the debt security or to scheduled payments on a debt security payable in equal installments over its term. For variable rate securities, the scheduled payments need not be equal.

FEDERAL HOME LOAN BANK STOCK

FEDERAL HOME LOAN BANK STOCK

The Bank, as a member of the Federal Home Loan Bank of Boston (“FHLBB”), is required to maintain an investment in capital stock of the FHLBB. Based on redemption provisions, the stock has no quoted market value and is carried at cost. At its discretion, the FHLBB may declare dividends on the stock. The Company reviews for impairment based on the ultimate recoverability of the cost basis of the stock. As of December 31, 2016, no impairment has been recognized.

LOANS HELD FOR SALE

LOANS HELD FOR SALE

Loans originated and intended for sale in the secondary market are carried at the lower of cost or estimated fair value in the aggregate. Net unrealized losses, if any, are recognized through a valuation allowance by charges to income.

LOANS

LOANS

Interest on loans is recognized based on the daily principal amount outstanding. Accrual of interest is discontinued when loans become ninety days delinquent unless the collateral is sufficient to cover both principal and interest and the loan is in the process of collection. Past-due status is based on contractual terms of the loan. Loans, including impaired loans, on which the accrual of interest has been discontinued, are designated nonaccrual loans. When a loan is placed on nonaccrual, all income that has been accrued but remains unpaid is reversed against current period income, and all amortization of deferred loan costs and fees is discontinued. Nonaccrual loans may be returned to an accrual status when principal and interest payments are not delinquent or the risk characteristics of the loan have improved to the extent that there no longer exists a concern as to the collectibility of principal and interest. Income received on nonaccrual loans is either recorded in income or applied to the principal balance of the loan, depending on management’s evaluation as to the collectibility of principal.

Loan origination fees and related direct loan origination costs are offset, and the resulting net amount is deferred and amortized over the life of the related loans using the level-yield method. Prepayments are not initially considered when amortizing premiums and discounts.

The Bank measures impairment for impaired loans at either the fair value of the loan, the present value of the expected future cash flows discounted at the loan’s effective interest rate or the fair value of the collateral if the loan is collateral dependent. This method applies to all loans, uncollateralized as well as collateralized, except large groups of smaller-balance homogeneous loans such as residential real estate and consumer loans that are collectively evaluated for impairment and loans that are measured at fair value. For collateral dependent loans, the amount of the recorded investment in a loan that exceeds the fair value of the collateral is charged-off against the allowance for loan losses in lieu of an allocation of a specific allowance when such an amount has been identified definitively as uncollectible. Management considers the payment status, net worth and earnings potential of the borrower, and the value and cash flow of the collateral as factors to determine if a loan will be paid in accordance with its contractual terms. Management does not set any minimum delay of payments as a factor in reviewing for impaired classification. Loans are charged-off when management believes that the collectibility of the loan’s principal is not probable. The specific factors that management considers in making the determination that the collectibility of the loan’s principal is not probable include the delinquency status of the loan, the fair value of the collateral, if secured, and, the financial strength of the borrower and/or guarantors. In addition, criteria for classification of a loan as in-substance foreclosure has been modified so that such classification need be made only when a lender is in possession of the collateral. The Bank measures the impairment of troubled debt restructurings using the pre-modification effective rate of interest.

TRANSFERS OF FINANCIAL ASSETS

TRANSFERS OF FINANCIAL ASSETS

Transfers of financial assets, typically residential mortgages and loan participations for the Company, are accounted for as sales when control over the assets has been surrendered. Control over transferred assets is deemed to be surrendered when (1) the assets have been isolated from the Company, (2) the transferee obtains the right (free of conditions that constrain it from taking advantage of that right) to pledge or exchange the transferred assets, and (3) the Company does not maintain effective control over the transferred assets.

ACQUIRED LOANS

ACQUIRED LOANS

In accordance with FASB ASC 310-30, Loans and Debt Securities Acquired with Deteriorated Credit Quality (formerly Statement of Position (“SOP”) No. 03-3, “Accounting for Certain Loans or Debt Securities Acquired in a Transfer”) the Company reviews acquired loans for differences between contractual cash flows and cash flows expected to be collected from the Company’s initial investment in the acquired loans to determine if those differences are attributable, at least in part, to credit quality. If those differences are attributable to credit quality, the loan’s contractually required payments received in excess of the amount of its cash flows expected at acquisition, or nonaccretable discount, is not accreted into income. FASB ASC 310-30 requires that the Company recognize the excess of all cash flows expected at acquisition over the Company’s initial investment in the loan as interest income using the interest method over the term of the loan. This excess is referred to as accretable discount and is recorded as a reduction of the loan balance.

Loans which, at acquisition, do not have evidence of deterioration of credit quality since origination are outside the scope of FASB ASC 310-30. For such loans, the discount, if any, representing the excess of the amount of reasonably estimable and probable discounted future cash collections over the purchase price, is accreted into interest income using the interest method over the term of the loan. Prepayments are not considered in the calculation of accretion income. Additionally, the discount is not accreted on nonperforming loans.

When a loan is paid off, the excess of any cash received over the net investment is recorded as interest income. In addition to the amount of purchase discount that is recognized at that time, income may include interest owed by the borrower prior to the Company’s acquisition of the loan, interest collected if on nonperforming status, prepayment fees and other loan fees. There were no new loans acquired during the year ended December 31, 2016.

NONPERFORMING ASSETS

NONPERFORMING ASSETS

In addition to nonperforming loans, nonperforming assets include other real estate owned. Other real estate owned is comprised of properties acquired through foreclosure or acceptance of a deed in lieu of foreclosure. Other real estate owned is recorded initially at estimated fair value less costs to sell. When such assets are acquired, the excess of the loan balance over the estimated fair value of the asset is charged to the allowance for loan losses. An allowance for losses on other real estate owned is established by a charge to earnings when, upon periodic evaluation by management, further declines in the estimated fair value of properties have occurred. Such evaluations are based on an analysis of individual properties as well as a general assessment of current real estate market conditions. Holding costs and rental income on properties are included in current operations, while certain costs to improve such properties are capitalized. Gains and losses from the sale of other real estate owned are reflected in earnings when realized.

ALLOWANCE FOR LOAN LOSSES

ALLOWANCE FOR LOAN LOSSES

The allowance for loan losses is based on management’s evaluation of the quality of the loan portfolio and is used to provide for losses resulting from loans that ultimately prove uncollectible. The components of the allowance for loan losses represent estimates based upon Accounting Standards Codification (“ASC”) Topic 450, contingencies, and ASC Topic 310 Receivables. ASC Topic 450 applies to homogenous loan pools such as consumer installment, residential mortgages, consumer lines of credit and commercial loans that are not individually evaluated for impairment under ASC Topic 310. In determining the level of the allowance, periodic evaluations are made of the loan portfolio, which takes into account factors such as the characteristics of the loans, loan status, financial strength of the borrowers, value of collateral securing the loans and other relevant information sufficient to reach an informed judgment. The allowance is increased by provisions charged to income and reduced by loan charge-offs, net of recoveries. Management maintains an allowance for loan losses to absorb losses inherent in the loan portfolio. The allowance is based on assessments of the probable estimated losses inherent in the loan portfolio. Management’s methodology for assessing the appropriateness of the allowance consists of several key elements, which include the specific allowances, if appropriate, for identified problem loans, formula allowance, and possibly an unallocated allowance. Arriving at an appropriate level of allowance for loan losses necessarily involves a high degree of judgment.

While management uses available information in establishing the allowance for loan losses, future adjustments to the allowance may be necessary if economic conditions differ substantially from the assumptions used in making the evaluations. Loans are charged-off in whole or in part when, in management’s opinion, collectibility is not probable. The specific factors that management considers in making the determination that the collectibility of the loan’s principal is not probable include the delinquency status of the loan, the fair value of the collateral and the financial strength of the borrower and/or guarantors.

Under ASC Topic 310, a loan is impaired, based upon current information and in management’s opinion, when it is probable that the loan will not be repaid according to its original contractual terms, including both principal and interest, or if a loan is designated as a TDR. Specific allowances for loan losses entail the assignment of allowance amounts to individual loans on the basis of loan impairment. Under this method, loans are selected for evaluation based upon a change in internal risk rating, occurrence of delinquency, loan classification or nonaccrual status. A specific allowance amount is allocated to an individual loan when such loan has been deemed impaired and when the amount of a probable loss is able to be estimated on the basis of: (a) present value of anticipated future cash flows, (b) the loan’s observable fair market price or (c) fair value of collateral if the loan is collateral dependent. For collateral dependent loans, the amount of the recorded investment in a loan that exceeds the fair value of the collateral is charged-off against the allowance for loan losses in lieu of an allocation of a specific allowance when such an amount has been identified definitively as uncollectible.

In estimating probable loan loss under ASC Topic 450 management considers numerous factors, including historical charge-offs and subsequent recoveries. The formula allowances are based on evaluations of homogenous loans to determine the allocation appropriate within each portfolio segment. Formula allowances are based on internal risk ratings or credit ratings from external sources. Individual loans within the commercial and industrial, commercial real estate and real estate construction loan portfolio segments are assigned internal risk ratings to group them with other loans possessing similar risk characteristics. Changes in risk grades affect the amount of the formula allowance. Risk grades are determined by reviewing current collateral value, financial information, cash flow, payment history and other relevant facts surrounding the particular credit. On these loans, the formula allowances are based on the risk ratings, the historical loss experience, and the loss emergence period. Historical loss data and loss emergence periods are developed based on the Company’s historical experience. For larger loans with available external credit ratings, these ratings are utilized rather than the Company’s risk ratings. The historical loss factor and loss emergence periods for these loans are based on data published by the rating agencies for similar credits as the Company has limited internal historical data. For the residential real estate and consumer loan portfolios, the formula allowances are calculated by applying historical loss experience and the loss emergence period to the outstanding balance in each loan category. Loss factors and loss emergence periods are based on the Company’s historical net loss experience.

Additional allowances are added to portfolio segments based on qualitative factors. Management considers potential factors identified in regulatory guidance. Management has identified certain qualitative factors, which could impact the degree of loss sustained within the portfolio. These include market risk factors and unique portfolio risk factors that are inherent characteristics of the Company’s loan portfolio. Market risk factors may consist of changes to general economic and business conditions, such as unemployment and GDP that may impact the Company’s loan portfolio customer base in terms of ability to repay and that may result in changes in value of underlying collateral. Unique portfolio risk factors may include the outlooks for business segments in which the Company’s borrowers operate and loan size. The potential ranges for qualitative factors are based on historical volatility in losses. The actual amount utilized is based on management’s assessment of current conditions.

After considering the above components, an unallocated component may be generated to cover uncertainties that could affect management’s estimate of probable losses. These uncertainties include the effects of loans in new geographical areas and new industries. The unallocated component of the allowance reflects the margin of imprecision inherent in the underlying assumptions used in the methodologies for estimating allocated and general reserves in the portfolio.

BANK PREMISES AND EQUIPMENT

BANK PREMISES AND EQUIPMENT

Bank premises and equipment are stated at cost less accumulated depreciation and amortization. Land is stated at cost. Depreciation is computed using the straight-line method over the estimated useful lives of the assets or the terms of leases, if shorter. It is general practice to charge the cost of maintenance and repairs to operations when incurred; major expenditures for improvements are capitalized and depreciated.

GOODWILL AND IDENTIFIABLE INTANGIBLE ASSETS

GOODWILL AND IDENTIFIABLE INTANGIBLE ASSETS

Goodwill represents the excess of the cost of an acquisition over the fair value of the net assets acquired. Goodwill is not subject to amortization. Identifiable intangible assets consist of core deposit intangibles and are assets resulting from acquisitions that are being amortized over their estimated useful lives. Goodwill and identifiable intangible assets are included in other assets on the consolidated balance sheets. The Company tests goodwill for impairment on an annual basis, or more often if events or circumstances indicate there may be impairment. Goodwill impairment testing is performed at the segment (or “reporting unit”) level. Currently, the Company’s goodwill is evaluated at the entity level as there is only one reporting unit. Goodwill is assigned to reporting units at the date the goodwill is initially recorded. Once goodwill has been assigned to reporting units, it no longer retains its association with a particular acquisition, and all of the activities within a reporting unit, whether acquired or organically grown, are available to support the value of the goodwill.

Goodwill impairment is evaluated by first assessing qualitative factors (events and circumstances) to determine whether it is more likely than not (meaning a likelihood of more than 50 percent) that the fair value of a reporting unit is less than its carrying amount. If, after considering all relevant events and circumstances, an entity determines it is not more likely than not that the fair value of a reporting unit is less than its carrying amount, then performing the two-step impairment test will be unnecessary.

The first step, in the two-step impairment test, used to identify potential impairment, involves comparing each reporting unit’s fair value to its carrying value including goodwill. If the fair value of a reporting unit exceeds its carrying value, applicable goodwill is considered not to be impaired. If the carrying value exceeds fair value, there is an indication of impairment and the second step is performed to measure the amount of impairment.

SERVICING

SERVICING

The Company services mortgage loans for others. Mortgage servicing assets are recognized as separate assets when rights are acquired through purchase or through sale of financial assets. Fair value is determined using prices for similar assets with similar characteristics, when available, or based upon discounted cash flows using market-based assumptions. The valuation model incorporates assumptions that market participants would use in estimating future net servicing income, such as the cost to service, the discount rate, an inflation rate, ancillary income, prepayment speeds and default rates and losses. Capitalized servicing rights are reported in other assets and are amortized into loan servicing fee income in proportion to, and over the period of, the estimated future net servicing income of the underlying financial assets. Servicing assets are evaluated for impairment based upon the fair value of the rights as compared to amortized cost. Impairment is determined by stratifying rights by predominant risk characteristics, such as interest rates and terms. Impairment is recognized through a valuation allowance for an individual stratum, to the extent that fair value is less than the capitalized amount for the stratum. Changes in the valuation allowance are reported in loan servicing fee income.

STOCK OPTION ACCOUNTING

STOCK OPTION ACCOUNTING

The Company follows the fair value recognition provisions of FASB ASC 718, Compensation — Stock Compensation for all share-based payments. The Company’s method of valuation for share-based awards granted utilizes the Black-Scholes option-pricing model. The Company will recognize compensation expense for its awards on a straight-line basis over the requisite service period for the entire award (straight-line attribution method), ensuring that the amount of compensation cost recognized at any date at least equals the portion of the grant-date fair value of the award that is vested at that time.

During 2000 and 2004, common stockholders of the Company approved stock option plans (the “Option Plans”) that provide for granting of options to purchase up to 150,000 shares of Class A common stock per plan. Under the Option Plans, all officers and key employees of the Company are eligible to receive nonqualified or incentive stock options to purchase shares of Class A common stock. The Option Plans are administered by the Compensation Committee of the Board of Directors, whose members are ineligible to participate in the Option Plans. Based on management’s recommendations, the Committee submits its recommendations to the Board of Directors as to persons to whom options are to be granted, the number of shares granted to each, the option price (which may not be less than 85% of the fair market value for nonqualified stock options, or the fair market value for incentive stock options, of the shares on the date of grant) and the time period over which the options are exercisable (not more than ten years from the date of grant). There were no options to purchase shares of Class A common stock outstanding at December 31, 2016.

The Company uses the fair value method to account for stock options. There were no options granted during 2016 and 2015.

INCOME TAXES

INCOME TAXES

The Company uses the asset and liability method in accounting for income taxes. Under the asset and liability method, deferred tax assets and liabilities are recognized for the future tax consequences attributable to differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax bases. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which temporary differences are expected to be recovered or settled. Under this method, the effect on deferred tax assets and liabilities of a change in tax rates is recognized in income in the period that includes the enactment date.

The Company accounts for uncertain tax positions in accordance with FASB ASC 740.

The Company classifies interest resulting from underpayment of income taxes as income tax expense in the first period the interest would begin accruing according to the provisions of the relevant tax law.

The Company classifies penalties resulting from underpayment of income taxes as income tax expense in the period for which the Company claims or expects to claim an uncertain tax position or in the period in which the Company’s judgment changes regarding an uncertain tax position.

EARNINGS PER SHARE ("EPS")

EARNINGS PER SHARE (“EPS”)

Class A and Class B shares participate equally in undistributed earnings. Under the Company’s Articles of Organization, the holders of Class A Common Stock are entitled to receive dividends per share equal to at least 200% of dividends paid, if any, from time to time, on each share of Class B Common Stock.

Diluted EPS includes the dilutive effect of common stock equivalents; basic EPS excludes all common stock equivalents. The only common stock equivalents for the Company are stock options.

The company utilizes the two class method for reporting EPS. The two-class method is an earnings allocation formula that treats Class A and Class B shares as having rights to earnings that otherwise would have been available only to Class A shareholders and Class B shareholders as if converted to Class A shares.

TREASURY STOCK

TREASURY STOCK

Effective July 1, 2004, companies incorporated in Massachusetts became subject to Chapter 156D of the Massachusetts Business Corporation Act, provisions of which eliminate the concept of treasury stock and provide that shares reacquired by a company are to be treated as authorized but unissued shares.

PENSION

PENSION

The Company provides pension benefits to its employees under a noncontributory, defined benefit plan, which is funded on a current basis in compliance with the requirements of the Employee Retirement Income Security Act of 1974 (“ERISA”) and recognizes costs over the estimated employee service period.

The Company also has a Supplemental Executive Insurance/Retirement Plan (“the Supplemental Plan”), which is limited to certain officers and employees of the Company. The Supplemental Plan is accrued on a current basis and recognizes costs over the estimated employee service period.

Executive officers of the Company or its subsidiaries who have at least one year of service may participate in the Supplemental Plan. The Supplemental Plan is voluntary. Individual life insurance policies, which are owned by the Company, are purchased covering the life of each participant.

The Company utilizes a full yield curve approach in the estimation of the service and interest components by applying the specific spot rates along the yield curve used in the determination of the benefit obligation to the underlying projected cash flows.

RECENT ACCOUNTING DEVELOPMENTS

RECENT ACCOUNTING DEVELOPMENTS

In May 2014, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) No. 2014-09, Revenue from Contracts with Customers (Topic 606). This ASU is intended to create a single source of revenue guidance which is more principles based than current revenue guidance. The guidance affects any entity that either enters into contracts with customers to transfer goods or services, or enters into contracts for the transfer of non-financial assets, unless those contracts are within the scope of other standards. In August 2015, the FASB issued ASU 2015-14, “Revenue from Contracts with Customers (Topic 606): Deferral of the Effective Date” to amend the effective date of ASU 2014-09. The amendments in ASU 2014-09 are effective for annual and interim periods within fiscal years beginning after December 15, 2017. Earlier adoption is permitted only as of annual reporting periods beginning after December 15, 2016, including interim reporting periods within that reporting period. The FASB has since issued additional related ASUs amendments intended to clarify certain aspects and improve understanding of the implementation guidance of Topic 606 but do not change the core principles of the guidance in Topic 606. The effective date and transition requirements for the amendments are the same as the effective date and transition requirements of Topic 606. The Company is currently evaluating the potential impact of the ASU and its amendments on the Company’s financial statements and results of operations.

In January 2016, FASB issued ASU 2016-1, “Financial Instruments-Overall” (Subtopic 825-10) Recognition and Measurement of Financial Assets and Financial Liabilities. This ASU significantly revises an entity’s accounting related to (1) the classification and measurement of investments in equity securities and (2) the presentation of certain fair value changes for financial liabilities measured at fair value. It also amends certain disclosure requirements associated with the fair value of financial instruments. This ASU is effective for fiscal years beginning after December 15, 2017, including interim periods therein. The Company is currently assessing the applicability of this ASU and has not determined the impact, if any, as of December 31, 2016.

In February 2016, the FASB issued ASU 2016-02, Leases. This ASU requires lessees to put most leases on their balance sheet but recognize expenses on their income statements in a manner similar to today’s accounting. This ASU also eliminates today’s real estate-specific provisions for all companies. For lessors, this ASU modifies the classification criteria and the accounting for sales-type and direct financing leases. This ASU is effective for fiscal years beginning after December 15, 2018, including interim periods therein. Early adoption is permitted. The Company is currently assessing the applicability of this ASU and has not determined the impact, if any, as of December 31, 2016.

In March 2016, the FASB issued ASU 2016-07, Investments — Equity Method and Joint Ventures (Topic 323) Simplifying the Transition to the Equity Method of Accounting. This ASU requires that an entity that has an available-for-sale equity security that becomes qualified for the equity method of accounting recognize through earnings the unrealized holding gain or loss in accumulated other comprehensive income at the date the investment becomes qualified for use of the equity method. This ASU is effective for all entities for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2016. The effect of this update is not expected to have a material impact on the Company’s consolidated financial position.

In March 2016, the FASB issued ASU 2016-09, Compensation — Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting. This ASU was issued as part of the FASB Simplification Initiative which intends to reduce the complexity of GAAP while improving usefulness to users. There are eight main items in this ASU that contribute to the simplification of share-based accounting. For public entities, this ASU is effective for the fiscal years beginning after December 15, 2016, including interim periods within those fiscal years. Early adoption is permitted. The effect of this update is not expected to have a material impact on the Company’s consolidated financial position.

In June 2016, the FASB issued ASU 2016-13, Financial Instruments-Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments. This ASU was issued to provide financial statement users with more decision-useful information about the expected credit losses on financial instruments and other commitments to extend credit held by a reporting entity at each reporting date. To achieve this objective, the amendments in this ASU replace the incurred loss impairment methodology in current GAAP with a methodology that reflects expected credit losses and requires consideration of a broader range of reasonable and supportable information to inform credit loss estimates. The amendments in this ASU are effective for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years. The Company is currently assessing this ASU and has not determined the impact, if any, as of December 31, 2016.

In August 2016, the FASB issued ASU 2016-15, Statement of Cash Flows (Topic 326) Classification of Certain Cash Receipts and Cash Payments. Stakeholders indicated that there is diversity in practice in how certain cash receipts and cash payments are presented and classified in the statement of cash flows under Topic 230, Statement of Cash Flows, and other Topics. This ASU addresses eight specific cash flow issues with the objective of reducing the existing diversity in practice. The amendments in this Update are effective for public business entities for fiscal years beginning after December 15, 2017, and interim periods within those fiscal years. The Company is currently assessing the applicability of this ASU and has not determined the impact, if any, as of December 31, 2016.

In October 2016, the FASB issued ASU 2016-16, Income Taxes (Topic 740) Intra-Entity Transfers of Assets Other Than Inventory. This ASU was issued to improve the accounting for income tax consequences of intra-entity transfers of assets other than inventory. For public entities, this ASU is effective for the fiscal years beginning after December 15, 2017, including interim periods within those fiscal years. Early adoption is permitted. Management is currently assessing the applicability of this ASU and has not determined the impact, if any, as of December 31, 2016.

In October 2016, the FASB issued ASU 2016-17, Consolidation (Topic 810) Interests Held through Related Parties That Are under Common Control. The amendments of this ASU affect reporting entities that are required to evaluate whether they should consolidate a Variable Interest Entity within the Variable Interest Entities Subsections of Subtopic 810-10, Consolidation — Overall, in certain situations involving entities under common control. For public entities, this ASU is effective for the fiscal years beginning after December 15, 2016, including interim periods within those fiscal years. Early adoption is permitted. The effect of this update is not expected to have a material impact on the Company’s consolidated financial position.

In November 2016, the FASB issued ASU 2016-18, Statement of Cash Flows (Topic 230) Restricted Cash. The amendments of this ASU was issued 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. For public entities, this ASU is effective for the fiscal years beginning after December 15, 2017, including interim periods within those fiscal years. Early adoption is permitted. Management is currently assessing the applicability of this ASU and has not determined the impact, if any, as of December 31, 2016.

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Securities Available-for-Sale (Tables)

12 Months Ended

Dec. 31, 2016

Text Block [Abstract]

Summary of Securities Available-for-Sale

	December 31, 2016								December 31, 2015
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Value		Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Value
(dollars in thousands)
U.S. Treasury	$	2,000	$	—	$	—	$	2,000	$	1,999	$	—	$	10	$	1,989
U.S. Government Sponsored Enterprises		25,000		—		48		24,952		—		—		—		—
SBA Backed Securities		57,899		14		146		57,767		5,983		8		2		5,989
U.S. Government Agency and Sponsored Enterprises Mortgage-Backed Securities		243,703		293		671		243,325		232,967		859		300		233,526
Privately Issued Residential Mortgage-Backed Securities		1,121		2		14		1,109		1,437		10		13		1,434
Obligations Issued by States and Political Subdivisions		165,281		—		405		164,876		157,838		—		878		156,960
Other Debt Securities		5,100		18		194		4,924		4,600		3		130		4,473
Equity Securities		116		228		—		344		153		99		—		252
Total	$	500,220	$	555	$	1,478	$	499,297	$	404,977	$	979	$	1,333	$	404,623

Estimated Maturity Distribution of Securities Available-for-Sale

The following table shows the estimated maturity distribution of the Company’s securities available-for-sale at December 31, 2016.

	Amortized Cost		Fair Value
(dollars in thousands)
Within one year	$	173,276	$	173,263
After one but within five years		107,005		106,782
After five but within ten years		168,698		168,347
More than ten years		49,625		49,207
Nonmaturing		1,616		1,698
Total	$	500,220	$	499,297

Continuous Unrealized Loss Position for 12 Months or Less and 12 Months and Longer

The following table shows the temporarily impaired securities of the Company’s available-for-sale portfolio at December 31, 2016. This table shows the unrealized market loss of securities that have been in a continuous unrealized loss position for 12 months or less and a continuous loss position for 12 months and longer. There are 49 and 15 securities that are temporarily impaired for less than 12 months and for 12 months or longer, respectively, out of a total of 270 holdings at December 31, 2016.

	December 31, 2016
	Less Than 12 Months				12 Months or Longer				Total
Temporarily Impaired Investments	Fair Value		Unrealized Losses		Fair Value		Unrealized Losses		Fair Value		Unrealized Losses
(dollars in thousands)
U.S. Treasury	$	—	$	—	$	—	$	—	$	—	$	—
U.S. Government Sponsored Enterprises		24,952		48		—		—		24,952		48
SBA Backed Securities		52,346		145		951		1		53,297		146
U.S. Government Agency and Sponsored Enterprise Mortgage-Backed Securities		135,612		485		31,504		186		167,116		671
Privately Issued Residential Mortgage-Backed Securities		—		—		757		14		757		14
Obligations Issued by States and Political Subdivisions		—		—		4,298		405		4,298		405
Other Debt Securities		453		47		1,553		147		2,006		194
Total temporarily impaired securities	$	213,363	$	725	$	39,063	$	753	$	252,426	$	1,478

The following table shows the temporarily impaired securities of the Company’s available-for-sale portfolio at December 31, 2015. This table shows the unrealized market loss of securities that have been in a continuous unrealized loss position for 12 months or less and a continuous loss position for 12 months and longer. There are 14 and 11 securities that are temporarily impaired for less than 12 months and for 12 months or longer, respectively, out of a total of 290 holdings at December 31, 2015.

	December 31, 2015
	Less Than 12 Months				12 Months or Longer				Total
Temporarily Impaired Investments	Fair Value		Unrealized Losses		Fair Value		Unrealized Losses		Fair Value		Unrealized Losses
(dollars in thousands)
U.S. Treasury	$	1,989	$	10	$	—	$	—	$	1,989	$	10
SBA Backed Securities		1,031		2		—		—		1,031		2
U.S. Government Agency and Sponsored Enterprise Mortgage-Backed Securities		26,519		52		49,341		248		75,860		300
Privately Issued Residential Mortgage-Backed Securities		—		—		490		13		490		13
Obligations Issued by States and Political Subdivisions		—		—		3,820		878		3,820		878
Other Debt Securities		497		3		1,373		127		1,870		130
Total temporarily impaired securities	$	30,036	$	67	$	55,024	$	1,266	$	85,060	$	1,333

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Investment Securities Held-to-Maturity (Tables)

12 Months Ended

Dec. 31, 2016

Text Block [Abstract]

Summary of Held-to-Maturity Securities

	December 31, 2016								December 31, 2015
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Value		Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Value
(dollars in thousands)
U.S. Government Sponsored Enterprises	$	148,326	$	1,066	$	527	$	148,865	$	186,734	$	2,234	$	141	$	188,827
SBA Backed Securities		46,140		—		1,088		45,052		—		—		—		—
U.S. Government Sponsored Enterprises Mortgage-Backed Securities		1,459,520		4,948		22,577		1,441,891		1,252,169		7,547		9,583		1,250,133
Total	$	1,653,986	$	6,014	$	24,192	$	1,635,808	$	1,438,903	$	9,781	$	9,724	$	1,438,960

Company's Securities Held-to-Maturity

The following table shows the maturity distribution of the Company’s securities held-to-maturity at December 31, 2016.

	Amortized Cost		Fair Value
(dollars in thousands)
Within one year	$	22,802	$	22,911
After one but within five years		1,122,678		1,114,481
After five but within ten years		500,355		490,546
More than ten years		8,151		7,870
Total	$	1,653,986	$	1,635,808

Unrealized Market Loss of Securities

The following table shows the temporarily impaired securities of the Company’s held-to-maturity portfolio at December 31, 2016. This table shows the unrealized market loss of securities that have been in a continuous unrealized loss position for 12 months or less and a continuous loss position for 12 months and longer. There are 194 and 16 securities that are temporarily impaired for less than 12 months and for 12 months or longer, respectively, out of a total of 375 holdings at December 31, 2016.

	December 31, 2016
	Less Than 12 Months				12 Months or Longer				Total
Temporarily Impaired Investments	Fair Value		Unrealized Losses		Fair Value		Unrealized Losses		Fair Value		Unrealized Losses
(dollars in thousands)
U.S. Government Sponsored Enterprises	$	59,219	$	527	$	—	$	—	$	59,219	$	527
SBA Backed Securities		45,052		1,088		—		—		45,052		1,088
U.S. Government Agency and Sponsored Enterprise Mortgage-Backed Securities		1,008,960		20,725		58,535		1,852		1,067,495		22,577
Total temporarily impaired securities	$	1,113,231	$	22,340	$	58,535	$	1,852	$	1,171,766	$	24,192

The following table shows the temporarily impaired securities of the Company’s held-to-maturity portfolio at December 31, 2015. This table shows the unrealized market loss of securities that have been in a continuous unrealized loss position for 12 months or less and a continuous loss position for 12 months and longer. There are 101 and 26 securities that are temporarily impaired for less than 12 months and for 12 months or longer, respectively, out of a total of 322 holdings at December 31, 2015.

	December 31, 2015
	Less Than 12 Months				12 Months or Longer				Total
Temporarily Impaired Investments	Fair Value		Unrealized Losses		Fair Value		Unrealized Losses		Fair Value		Unrealized Losses
(dollars in thousands)
U.S. Government Sponsored Enterprises	$	9,859	$	141	$	—	$	—	$	9,859	$	141
U.S. Government Agency and Sponsored Enterprise Mortgage-Backed Securities		626,218		6,657		123,864		2,926		750,082		9,583
Total temporarily impaired securities	$	636,077	$	6,798	$	123,864	$	2,926	$	759,941	$	9,724

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Loans (Tables)

12 Months Ended

Dec. 31, 2016

Debt Disclosure [Abstract]

Summary of Composition of Loan Portfolio

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

December 31,	2016		2015
(dollars in thousands)
Construction and land development	$	14,928	$	27,421
Commercial and industrial		612,503		452,235
Municipal		135,418		85,685
Commercial real estate		696,173		721,506
Residential real estate		241,357		255,346
Consumer		11,013		10,744
Home equity		211,857		178,020
Overdrafts		684		579
Total	$	1,923,933	$	1,731,536

Composition of Nonaccrual Loans and Impaired Loans

The composition of nonaccrual loans and impaired loans is as follows:

December 31,	2016		2015		2014
(dollars in thousands)
Loans on nonaccrual	$	1,084	$	2,336	$	4,146
Loans 90 days past due and still accruing		—		—		—
Impaired loans on nonaccrual included above		304		332		3,031
Total recorded investment in impaired loans		3,830		3,225		6,327
Average recorded investment of impaired loans		3,661		4,490		7,434
Accruing troubled debt restructures		3,526		2,893		3,296
Interest income not recorded on nonaccrual loans according to their original terms		37		91		123
Interest income on nonaccrual loans actually recorded		—		—		—
Interest income recognized on impaired loans		140		104		144

Aggregate Amount of Loans to Directors and Officers of Company and their Associates

The following table shows the aggregate amount of loans to directors and officers of the Company and their associates during 2016.

Balance at December 31, 2015	Additions		Repayments and Deletions		Balance at December 31, 2016
(dollars in thousands)
$5,010	$	6,778	$	806	$	10,982

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Allowance for Loan Losses (Tables)

12 Months Ended

Dec. 31, 2016

Receivables [Abstract]

Analysis of Allowance for Loan Losses

An analysis of the allowance for loan losses for each of the three years ending December 31, 2016, 2015 and 2014 is as follows:

	2016			2015			2014
(dollars in thousands)
Allowance for loan losses, beginning of year	$	23,075		$	22,318		$	20,941
Loans charged-off		(389	)		(781	)		(1,382	)
Recoveries on loans previously charged-off		434			1,338			709
Net recoveries (charge-offs)		45			557			(673	)
Provision charged to expense		1,375			200			2,050
Reclassification to other liabilities*		(89	)		—			—
Allowance for loan losses, end of year	$	24,406		$	23,075		$	22,318

* The reclassification relates to allowance for loan losses allocations on unused commitments that have been reclassified to other liabilities.

Summary of Allowance for Loan Losses

Further information pertaining to the allowance for loan losses at December 31, 2016 follows:

	Construction and Land Development			Commercial and Industrial			Municipal		Commercial Real Estate			Residential Real Estate			Consumer			Home Equity			Unallocated			Total
(dollars in thousands)
Allowance for Loan Losses:
Balance at December 31, 2015	$	2,041		$	5,899		$	994	$	10,589		$	1,320		$	644		$	1,077		$	511		$	23,075
Charge-offs		—			—			—		—			—			(362	)		(27	)		—			(389	)
Recoveries		—			132			—		—			6			296			—			—			434
Reclassification to other liabilities		(5	)		(25	)		—		(9	)		(3	)		(3	)		(44	)		—			(89	)
Provision		(1,024	)		966			618		555			375			7			96			(218	)		1,375
Ending balance at December 31, 2016	$	1,012		$	6,972		$	1,612	$	11,135		$	1,698		$	582		$	1,102		$	293		$	24,406
Amount of allowance for loan losses for loans deemed to be impaired	$	3		$	23		$	—	$	140		$	7		$	—		$	—		$	—		$	173
Amount of allowance for loan losses for loans not deemed to be impaired	$	1,009		$	6,949		$	1,612	$	10,995		$	1,691		$	582		$	1,102		$	293		$	24,233
Loans:
Ending balance	$	14,928		$	612,503		$	135,418	$	696,173		$	241,357		$	11,697		$	211,857		$	—		$	1,923,933
Loans deemed to be impaired	$	94		$	389		$	—	$	3,149		$	198		$	—		$	—		$	—		$	3,830
Loans not deemed to be impaired	$	14,834		$	612,114		$	135,418	$	693,024		$	241,159		$	11,697		$	211,857		$	—		$	1,920,103

Further information pertaining to the allowance for loan losses at December 31, 2015 follows:

	Construction and Land Development			Commercial and Industrial			Municipal			Commercial Real Estate			Residential Real Estate		Consumer			Home Equity		Unallocated			Total
(dollars in thousands)
Allowance for Loan Losses:
Balance at December 31, 2014	$	1,592		$	4,757		$	1,488		$	11,199		$	776	$	810		$	599	$	1,097		$	22,318
Charge-offs		—			(172	)		—			(298	)		—		(311	)		—		—			(781	)
Recoveries		780			212			—			84			7		255			—		—			1,338
Provision		(331	)		1,102			(494	)		(396	)		537		(110	)		478		(586	)		200
Ending balance at December 31, 2015	$	2,041		$	5,899		$	994		$	10,589		$	1,320	$	644		$	1,077	$	511		$	23,075
Amount of allowance for loan losses for loans deemed to be impaired	$	10		$	19		$	—		$	99		$	32	$	—		$	90	$	—		$	250
Amount of allowance for loan losses for loans not deemed to be impaired	$	2,031		$	5,880		$	994		$	10,490		$	1,288	$	644		$	987	$	511		$	22,825
Loans:
Ending balance	$	27,421		$	452,235		$	85,685		$	721,506		$	255,346	$	11,323		$	178,020	$	—		$	1,731,536
Loans deemed to be impaired	$	98		$	443		$	—		$	1,678		$	916	$	—		$	90	$	—		$	3,225
Loans not deemed to be impaired	$	27,323		$	451,792		$	85,685		$	719,828		$	254,430	$	11,323		$	177,930	$	—		$	1,728,311

Loans by Risk Rating

The following table presents the Company’s loans by risk rating at December 31, 2016.

	Construction and Land Development		Commercial and Industrial		Municipal		Commercial Real Estate
(dollars in thousands)
Grade:
1-3 (Pass)	$	14,834	$	612,114	$	135,418	$	661,271
4 (Monitor)		—		—		—		31,753
5 (Substandard)		—		—		—		—
6 (Doubtful)		—		—		—		—
Impaired		94		389		—		3,149
Total	$	14,928	$	612,503	$	135,418	$	696,173

The following table presents the Company’s loans by risk rating at December 31, 2015.

	Construction and Land Development		Commercial and Industrial		Municipal		Commercial Real Estate
(dollars in thousands)
Grade:
1-3 (Pass)	$	20,281	$	451,774	$	85,685	$	718,911
4 (Monitor)		7,042		18		—		917
5 (Substandard)		—		—		—		—
6 (Doubtful)		—		—		—		—
Impaired		98		443		—		1,678
Total	$	27,421	$	452,235	$	85,685	$	721,506

Loans by Credit Rating

The following table presents the Company’s loans by credit rating at December 31, 2016.

	Commercial and Industrial		Municipal		Commercial Real Estate		Total
(dollars in thousands)
Credit Rating:
Aaa-Aa3	$	334,674	$	66,245	$	6,596	$	407,515
A1-A3		188,777		33,365		129,423		351,565
Baa1-Baa3		—		26,970		127,366		154,336
Ba2		—		3,610		—		3,610
Total	$	523,451	$	130,190	$	263,385	$	917,026

The following table presents the Company’s loans by credit rating at December 31, 2015.

	Commercial and Industrial		Municipal		Commercial Real Estate		Total
(dollars in thousands)
Credit Rating:
Aaa-Aa3	$	234,733	$	63,865	$	7,547	$	306,145
A1-A3		140,419		7,400		130,872		278,691
Baa1-Baa3		—		8,890		167,489		176,379
Ba2		—		4,480		—		4,480
Total	$	375,152	$	84,635	$	305,908	$	765,695

Aging of Past Due Loan Losses

At December 31, 2016 the aging of past due loans are as follows:

	Accruing 30-89 Days Past Due		Non Accrual		Accruing Greater Than 90 Days		Total Past Due		Current Loans		Total
(dollars in thousands)
Construction and land development	$	—	$	94	$	—	$	94	$	14,834	$	14,928
Commercial and industrial		37		65		—		102		612,401		612,503
Municipal		—		—		—		—		135,418		135,418
Commercial real estate		597		150		—		747		695,426		696,173
Residential real estate		245		656		—		901		240,456		241,357
Consumer and overdrafts		—		11		—		11		11,686		11,697
Home equity		735		108		—		843		211,014		211,857
Total	$	1,614	$	1,084	$	—	$	2,698	$	1,921,235	$	1,923,933

At December 31, 2015 the aging of past due loans are as follows:

	Accruing 30-89 Days Past Due		Non Accrual		Accruing Greater Than 90 Days		Total Past Due		Current Loans		Total
(dollars in thousands)
Construction and land development	$	—	$	99	$	—	$	99	$	27,322	$	27,421
Commercial and industrial		—		60		—		60		452,175		452,235
Municipal		—		—		—		—		85,685		85,685
Commercial real estate		1,462		174		—		1,636		719,870		721,506
Residential real estate		596		1,559		—		2,155		253,191		255,346
Consumer and overdrafts		6		—		—		6		11,317		11,323
Home equity		628		444		—		1,072		176,948		178,020
Total	$	2,692	$	2,336	$	—	$	5,028	$	1,726,508	$	1,731,536

Information Pertaining to Impaired Loans

The following is information pertaining to impaired loans at December 31, 2016:

	Carrying Value		Unpaid Balance Principal		Required Reserve		Average Carrying Value Recognized		Interest Income
(dollars in thousands)
With no required reserve recorded:
Construction and land development	$	—	$	—	$	—	$	—	$	—
Commercial and industrial		45		232		—		53		—
Municipal		—		—		—		—		—
Commercial real estate		590		590		—		375		39
Residential real estate		90		179		—		102		7
Consumer		—		—		—		—		—
Home equity		—		—		—		—		—
Total	$	725	$	1,001	$	—	$	530	$	46
With required reserve recorded:
Construction and land development	$	94	$	108	$	3	$	96	$	—
Commercial and industrial		344		360		23		360		18
Municipal		—		—		—		—		—
Commercial real estate		2,559		2,665		140		2,324		71
Residential real estate		108		108		7		323		5
Consumer		—		—		—		—		—
Home equity		—		—		—		28		—
Total	$	3,105	$	3,241	$	173	$	3,131	$	94
Total
Construction and land development	$	94	$	108	$	3	$	96	$	—
Commercial and industrial		389		592		23		413		18
Municipal		—		—		—		—		—
Commercial real estate		3,149		3,255		140		2,699		110
Residential real estate		198		287		7		425		12
Consumer		—		—		—		—		—
Home equity		—		—		—		28		—
Total	$	3,830	$	4,242	$	173	$	3,661	$	140

The following is information pertaining to impaired loans at December 31, 2015:

	Carrying Value		Unpaid Balance Principal		Required Reserve		Average Carrying Value Recognized		Interest Income
(dollars in thousands)
With no required reserve recorded:
Construction and land development	$	—	$	—	$	—	$	—	$	—
Commercial and industrial		60		246		—		32		—
Municipal		—		—		—		—		—
Commercial real estate		—		—		—		151		—
Residential real estate		114		200		—		125		8
Consumer		—		—		—		—		—
Home equity		—		—		—		—		—
Total	$	174	$	446	$	—	$	308	$	8
With required reserve recorded:
Construction and land development	$	98	$	108	$	10	$	101	$	—
Commercial and industrial		383		399		19		626		20
Municipal		—		—		—		—		—
Commercial real estate		1,678		1,776		99		2,550		69
Residential real estate		802		802		32		814		7
Consumer		—		—		—		—		—
Home equity		90		90		90		91		—
Total	$	3,051	$	3,175	$	250	$	4,182	$	96
Total
Construction and land development	$	98	$	108	$	10	$	101	$	—
Commercial and industrial		443		645		19		658		20
Municipal		—		—		—		—		—
Commercial real estate		1,678		1,776		99		2,701		69
Residential real estate		916		1,002		32		939		15
Consumer		—		—		—		—		—
Home equity		90		90		90		91		—
Total	$	3,225	$	3,621	$	250	$	4,490	$	104

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Bank Premises and Equipment (Tables)

12 Months Ended

Dec. 31, 2016

Property, Plant and Equipment [Abstract]

Schedule of Bank Premises and Equipment

December 31,	2016			2015			Estimated Useful Life
(dollars in thousands)
Land	$	3,478		$	3,478			—
Bank premises		19,272			19,272			30-39 years
Furniture and equipment		26,271			24,131			3-10 years
Leasehold improvements		12,802			12,892			30-39 years or lease term
		61,823			59,773
Accumulated depreciation and amortization		(38,406	)		(35,667	)
Total	$	23,417		$	24,106

Summary of Future Minimum Rental Commitments for Non-Cancelable Operating Leases

Future minimum rental commitments for non-cancelable operating leases with initial or remaining terms of one year or more at December 31, 2016, were as follows:

Year		Amount
(dollars in thousands)
	2017	$	2,408
	2018		2,222
	2019		2,054
	2020		1,777
	2021		1,326
	Thereafter		2,526
		$	12,313

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Goodwill and Identifiable Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2016

Goodwill and Intangible Assets Disclosure [Abstract]

Goodwill and Identifiable Intangible Assets

The changes in goodwill and identifiable intangible assets for the years ended December 31, 2016 and 2015 are shown in the table below.

Carrying Amount of Goodwill and Intangibles	Goodwill		Mortgage Servicing Rights			Total
(dollars in thousands)
Balance at December 31, 2014	$	2,714	$	941		$	3,655
Additions		—		626			626
Amortization Expense		—		(262	)		(262	)
Balance at December 31, 2015	$	2,714	$	1,305		$	4,019
Additions		—		708			708
Amortization Expense		—		(384	)		(384	)
Balance at December 31, 2016	$	2,714	$	1,629		$	4,343

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Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2016

Fair Value Disclosures [Abstract]

Financial Instruments Measured at Fair Value on a Recurring and Non-recurring Basis

The results of the fair value hierarchy as of December 31, 2016, are as follows:

	Fair Value Measurements Using
	Carrying Value		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Observable Inputs (Level 2)		Significant Other Unobservable Inputs (Level 3)
(dollars in thousands)
Financial Instruments Measured at Fair Value on a Recurring Basis — Securities AFS
U.S. Treasury	$	2,000	$	—	$	2,000	$	—
U.S. Government Agency Sponsored Enterprises		24,952		—		24,952		—
SBA Backed Securities		57,767		—		57,767		—
U.S. Government Agency and Sponsored Enterprises Mortgage-Backed Securities		243,325		—		243,325		—
Privately Issued Residential Mortgage-Backed Securities		1,109		—		1,109		—
Obligations Issued by States and Political Subdivisions		164,876		—		—		164,876
Other Debt Securities		4,924		—		4,924		—
Equity Securities		344		344		—		—
Total	$	499,297	$	344	$	334,077	$	164,876
Financial Instruments Measured at Fair Value on a Non-recurring Basis
Impaired Loans	$	260	$	—	$	—	$	260

The results of the fair value hierarchy as of December 31, 2015, are as follows:

	Fair Value Measurements Using
	Carrying Value		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Observable Inputs (Level 2)		Significant Other Unobservable Inputs (Level 3)
(dollars in thousands)
Financial Instruments Measured at Fair Value on a Recurring Basis — Securities AFS
U.S. Treasury	$	1,989	$	—	$	1,989	$	—
SBA Backed Securities		5,989		—		5,989		—
U.S. Government Agency and Sponsored Enterprises Mortgage-Backed Securities		233,526		—		233,526		—
Privately Issued Residential Mortgage-Backed Securities		1,434		—		1,434		—
Obligations Issued by States and Political Subdivisions		156,960		—		—		156,960
Other Debt Securities		4,473		—		4,473		—
Equity Securities		252		215		—		37
Total	$	404,623	$	215	$	247,411	$	156,997
Financial Instruments Measured at Fair Value on a Non-recurring Basis
Impaired Loans	$	1,056	$	—	$	—	$	1,056

Assets Measured at Fair Value

The following table presents additional information about assets measured at fair value on a recurring and nonrecurring basis for which the Company has utilized Level 3 inputs to determine fair value (dollars in thousands) at December 31, 2016. Management continues to monitor the assumptions used to value the assets listed below.

Asset	Fair Value		Valuation Technique	Unobservable Input	Unobservable Input Value or Range
Securities AFS(1)	$	164,876	Discounted cash flow	Discount rate	0%-1%(2)
Impaired Loans		260	Appraisal of collateral(3)	Appraisal adjustments(4)	0%-30% discount

(1) Municipal securities generally have maturities of one year or less and, therefore, the amortized cost equates to the fair value.

(2) Weighted averages.

(3) Fair value is generally determined through independent appraisals of the underlying collateral, which generally include various Level 3 inputs which are not identifiable.

(4) Appraisals may be adjusted by management for qualitative factors such as economic conditions and estimated expenses.

The following table presents additional information about assets measured at fair value on a recurring and nonrecurring basis for which the Company has utilized Level 3 inputs to determine fair value (dollars in thousands) at December 31, 2015. Management continues to monitor the assumptions used to value the assets listed below.

Asset	Fair Value		Valuation Technique	Unobservable Input	Unobservable Input Value or Range
Securities AFS(1)	$	156,997	Discounted cash flow	Discount rate	0%-1%(2)
Impaired Loans		1,056	Appraisal of collateral(3)	Appraisal adjustments(4)	0%-30% discount

⁽¹⁾ Municipal securities generally have maturities of one year or less and, therefore, the amortized cost equates to the fair value.

⁽²⁾ Weighted averages.

⁽³⁾ Fair value is generally determined through independent appraisals of the underlying collateral, which generally include various Level 3 inputs which are not identifiable.

⁽⁴⁾ Appraisals may be adjusted by management for qualitative factors such as economic conditions and estimated expenses.

Changes in Level 3 Securities

The changes in Level 3 securities for the year ended December 31, 2016 are as shown in the table below:

	Auction Rate Securities		Obligations Issued by States and Political Subdivisions			Equity Securities			Total
(dollars in thousands)
Balance at December 31, 2015	$	3,820	$	153,140		$	37		$	156,997
Purchases		—		216,646			—			216,646
Maturities/redemptions		—		(208,990	)		(37	)		(209,027	)
Amortization		—		(218	)		—			(218	)
Change in fair value		478		—			—			478
Balance at December 31, 2016	$	4,298	$	160,578		$	—		$	164,876

The changes in Level 3 securities for the year ended December 31, 2015 are as shown in the table below:

	Auction Rate Securities		Obligations Issued by  States and Political Subdivisions			Equity Securities			Total
(dollars in thousands)
Balance at December 31, 2014	$	3,820	$	92,964		$	102		$	96,886
Purchases		—		207,509			—			207,509
Maturities/redemptions		—		(147,277	)		(65	)		(147,342	)
Amortization		—		(56	)		—			(56	)
Change in fair value		—		—			—			—
Balance at December 31, 2015	$	3,820	$	153,140		$	37		$	156,997

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Deposits (Tables)

12 Months Ended

Dec. 31, 2016

Banking and Thrift [Abstract]

Summary of Remaining Maturities or Re-pricing of Time Deposits

The following is a summary of remaining maturities or re-pricing of time deposits as of December 31,

	2016		Percent			2015		Percent
(dollars in thousands)
Within one year	$	262,406		55	%	$	315,559		67	%
Over one year to two years		87,952		18	%		44,838		9	%
Over two years to three years		83,067		17	%		49,538		10	%
Over three years to five years		44,934		10	%		63,491		14	%
Total	$	478,359		100	%	$	473,426		100	%

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Securities Sold Under Agreements to Repurchase (Tables)

12 Months Ended

Dec. 31, 2016

Brokers and Dealers [Abstract]

Summary of Securities Sold Under Agreements to Repurchase

The following is a summary of securities sold under agreements to repurchase as of December 31,

	2016			2015			2014
(dollars in thousands)
Amount outstanding at December 31	$	182,280		$	197,850		$	212,360
Weighted average rate at December 31		0.21	%		0.21	%		0.18	%
Maximum amount outstanding at any month end	$	241,110		$	299,890		$	243,750
Daily average balance outstanding during the year	$	222,956		$	245,276		$	216,937
Weighted average rate during the year		0.21	%		0.20	%		0.18	%

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Other Borrowed Funds and Subordinated Debentures (Tables)

12 Months Ended

Dec. 31, 2016

Banking and Thrift [Abstract]

Summary of Other Borrowed Funds and Subordinated Debentures

The following is a summary of other borrowed funds and subordinated debentures as of December 31,

	2016			2015			2014
(dollars in thousands)
Amount outstanding at December 31	$	329,083		$	404,083		$	431,583
Weighted average rate at December 31		2.39	%		2.29	%		1.91	%
Maximum amount outstanding at any month end	$	467,083		$	521,583		$	431,583
Daily average balance outstanding during the year	$	357,974		$	374,109		$	271,710
Weighted average rate during the year		2.48	%		2.38	%		3.34	%

Schedule of the Maturity Distribution of FHLBB Advances with the Weighted Average Interest Rates

A schedule of the maturity distribution of FHLBB advances with the weighted average interest rates is as follows:

	2016					2015					2014
December 31,	Amount		Weighted Average Rate			Amount		Weighted Average Rate			Amount		Weighted Average Rate
(dollars in thousands)
Within one year	$	77,500		2.21	%	$	100,000		1.89	%	$	169,500		0.51	%
Over one year to two years	$	54,500		2.25	%	$	57,500		2.72	%	$	55,000		3.07	%
Over two years to three years	$	58,000		1.87	%	$	54,500		2.25	%	$	45,000		3.18	%
Over three years to five years	$	58,000		2.68	%	$	91,000		1.85	%	$	70,000		2.43	%
Over five years	$	45,000		2.85	%	$	65,000		3.23	%	$	56,000		3.16	%
Total	$	293,000		2.34	%	$	368,000		2.30	%	$	395,500		1.89	%

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Reclassifications Out of Accumulated Other Comprehensive Income (Tables)

12 Months Ended

Dec. 31, 2016

Text Block [Abstract]

Reclassifications Out of Accumulated Other Comprehensive Income

	Amount Reclassified from Accumulated Other Comprehensive Income
Details about Accumulated Other Comprehensive Income Components	Year ended December 31, 2016(a)			Year ended December 31, 2015(a)			Affected line item in the Statement Where Net Income is Presented
Unrealized gains and losses on available-for-sale securities	$	52		$	594		Net gains on sales of investments
		(20	)		(233	)	Provision for income taxes
	$	32		$	361		Net income
Accretion of unrealized losses transferred	$	(4,317	)	$	(5,502	)	Securities held-to-maturity
		1,505			1,919		Provision for income taxes
	$	(2,812	)	$	(3,583	)	Net income
Amortization of defined benefit pension items
Prior-service costs	$	(10	)	$	(10	)	Salaries and employee benefits(b)
Actuarial gains (losses)		(1,606	)		(1,411	)	Salaries and employee benefits(b)
Total before tax		(1,616	)		(1,421	)	Income before taxes
Tax (expense) or benefit		646			568		Provision for income taxes
Net of tax	$	(970	)	$	(853	)	Net income

^(a) Amounts in parentheses indicate decreases to profit/loss.

^(b) These accumulated other comprehensive income components are included in the computation of net periodic pension cost (see employee benefits footnote (Note 17) for additional details).

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Earnings per share ("EPS") (Tables)

12 Months Ended

Dec. 31, 2016

Earnings Per Share [Abstract]

Reconciliation of Basic EPS and Diluted EPS

The following table is a reconciliation of basic EPS and diluted EPS:

Year Ended December 31,	2016		2015		2014
(in thousands except share and per share data)
BASIC EPS COMPUTATION
Numerator:
Net income, Class A	$	19,270	$	18,081	$	17,157
Net income, Class B		5,264		4,940		4,703
Denominator:
Weighted average shares outstanding, Class A		3,600,729		3,600,729		3,591,732
Weighted average shares outstanding, Class B		1,967,180		1,967,180		1,969,030
Basic EPS, Class A	$	5.35	$	5.02	$	4.78
Basic EPS, Class B	$	2.68	$	2.51	$	2.39
DILUTED EPS COMPUTATION
Numerator:
Net income, Class A	$	19,270	$	18,081	$	17,157
Net income, Class B		5,264		4,940		4,703
Total net income, for diluted EPS, Class A computation		24,534		23,021		21,860
Denominator:
Weighted average shares outstanding, basic, Class A		3,600,729		3,600,729		3,591,732
Weighted average shares outstanding, Class B		1,967,180		1,967,180		1,969,030
Dilutive effect of Class A stock options		—		—		1,447
Weighted average shares outstanding diluted, Class A		5,567,909		5,567,909		5,562,209
Weighted average shares outstanding, Class B		1,967,180		1,967,180		1,969,030
Diluted EPS, Class A	$	4.41	$	4.13	$	3.93
Diluted EPS, Class B	$	2.68	$	2.51	$	2.39

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Stockholders' Equity (Tables)

12 Months Ended

Dec. 31, 2016

Equity [Abstract]

Summary of Stock Option Activity Under Stock Option Plan

Stock option activity under the plan is as follows:

	December 31, 2016				December 31, 2015				December 31, 2014
	Amount		Weighted Average Exercise Price		Amount		Weighted Average Exercise Price		Amount			Weighted Average Exercise Price
Shares under option:
Outstanding at beginning of year		—	$	—		—	$	—		20,375		$	31.82
Forfeited		—		—		—		—		(9,050	)		31.83
Exercised		—		—		—		—		(11,325	)		31.81
Outstanding at end of year		—	$	—		—	$	—		—		$	—
Exercisable at end of year		—	$	—		—	$	—		—		$	—
Available to be granted at end of year		233,934				233,934				233,934

Summary of the Bank's Actual Capital Amounts and Ratios

The Bank’s actual capital amounts and ratios are presented in the following table:

	Actual					For  Capital Adequacy Purposes					To Be Well Capitalized Under Prompt Corrective Action Provisions
	Amount		Ratio			Amount		Ratio			Amount		Ratio
As of December 31, 2016
Total Capital (to Risk-Weighted Assets)	$	293,143		12.27	%	$	191,081		8.00	%	$	238,851		10.00	%
Tier 1 Capital (to Risk-Weighted Assets)		268,737		11.25	%		143,311		6.00	%		191,081		8.00	%
Common Equity Tier 1 Capital (to Risk-Weighted Assets)		268,737		11.25	%		107,483		4.50	%		155,253		6.50	%
Tier 1 Capital (to 4th Qtr. Average Assets)		268,737		6.02	%		178,469		4.00	%		223,086		5.00	%
As of December 31, 2015
Total Capital (to Risk-Weighted Assets)	$	278,769		12.03	%	$	185,320		8.00	%	$	231,650		10.00	%
Tier 1 Capital (to Risk-Weighted Assets)		255,694		11.04	%		138,990		6.00	%		185,320		8.00	%
Common Equity Tier 1 Capital (to Risk-Weighted Assets)		255,694		11.04	%		104,242		4.50	%		150,572		6.50	%
Tier 1 Capital (to 4th Qtr. Average Assets)		255,964		6.48	%		157,734		4.00	%		197,167		5.00	%

Summary of the Company's Actual Capital Amounts and Ratios

The Company’s actual capital amounts and ratios are presented in the following table:

	Actual					For Capital Adequacy Purposes					To Be Well Capitalized Under Prompt Corrective Action Provisions
	Amount		Ratio			Amount		Ratio			Amount		Ratio
As of December 31, 2016
Total Capital (to Risk-Weighted Assets)	$	305,065		12.72	%	$	191,904		8.00	%	$	239,880		10.00	%
Tier 1 Capital (to Risk-Weighted Assets)		280,659		11.70	%		143,928		6.00	%		191,904		8.00	%
Common Equity Tier 1 Capital (to Risk-Weighted Assets)		249,753		10.41	%		107,946		4.50	%		155,922		6.50	%
Tier 1 Capital (to 4th Qtr. Average Assets)		280,659		6.28	%		178,903		4.00	%		223,628		5.00	%
As of December 31, 2015
Total Capital (to Risk-Weighted Assets)	$	291,635		12.54	%	$	186,021		8.00	%	$	232,526		10.00	%
Tier 1 Capital (to Risk-Weighted Assets)		268,560		11.55	%		139,515		6.00	%		186,021		8.00	%
Common Equity Tier 1 Capital (to Risk-Weighted Assets)		233,560		10.04	%		104,637		4.50	%		151,142		6.50	%
Tier 1 Capital (to 4th Qtr. Average Assets)		268,560		6.79	%		158,114		4.00	%		197,642		5.00	%

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Income Taxes (Tables)

12 Months Ended

Dec. 31, 2016

Income Tax Disclosure [Abstract]

Summary of Current and Deferred Components of Income Tax (Benefit) Expense

The current and deferred components of income tax (benefit) expense for the years ended December 31, are as follows:

	2016			2015			2014
(dollars in thousands)
Current expense:
Federal	$	3,875		$	3,393		$	3,981
State		439			399			498
Total current expense		4,314			3,792			4,479
Deferred (benefit) expense:
Federal		(4,450	)		(3,098	)		(3,179	)
State		(334	)		(161	)		(434	)
Valuation allowance		108			—			—
Total deferred benefit		(4,676	)		(3,259	)		(3,613	)
Provision for income taxes	$	(362	)	$	533		$	866

Income Tax Accounts Included in Other Assets

Income tax accounts included in other assets at December 31, are as follows:

	2016		2015
(dollars in thousands)
Currently receivable	$	633	$	1,217
Deferred income tax asset, net		43,129		40,157
Total	$	43,762	$	41,374

Summary of Differences between Income Tax (Benefit) Expense at the Statutory Federal Income Tax Rate and Total Income Tax Expense

Differences between income tax (benefit) expense at the statutory federal income tax rate and total income tax expense are summarized as follows:

	2016			2015			2014
(dollars in thousands)
Federal income tax expense at statutory rates	$	8,218		$	8,008		$	7,727
State income tax, net of federal income tax benefit		69			157			42
Insurance income		(406	)		(375	)		(353	)
Effect of tax-exempt interest		(8,259	)		(6,915	)		(6,097	)
Net tax credit		(395	)		(460	)		(517	)
Valuation allowance		108			—			—
Other		303			118			64
Total	$	(362	)	$	533		$	866
Effective tax rate		(1.50	)%		2.30	%		3.80	%

Gross Deferred Income Tax Assets and Gross Deferred Income Tax Liabilities

The following table sets forth the Company’s gross deferred income tax assets and gross deferred income tax liabilities at December 31:

	2016			2015
(dollars in thousands)
Deferred income tax assets:
Allowance for loan losses	$	10,419		$	9,852
AMT credit		10,234			7,041
Deferred compensation		9,684			8,495
Pension and SERP liability		7,658			8,714
Unrealized losses on securities transferred to held-to-maturity		3,161			4,667
Depreciation		968			673
Accrued bonus		612			508
Unrealized (gains) losses on securities available-for-sale		357			108
Charitable contributions carryforward		266			—
Acquisition premium		128			231
Nonaccrual interest		125			138
Limited partnerships		30			52
Investments write down		26			26
Other		220			173
Gross deferred income tax asset		43,888			40,678
Valuation allowance		(108	)		—
Gross deferred income tax asset,net of valuation allowance		43,780			40,678
Deferred income tax liabilities:
Mortgage servicing rights		(651	)		(521	)
Gross deferred income tax liability		(651	)		(521	)
Deferred income tax asset net	$	43,129		$	40,157

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Employee Benefits (Tables)

12 Months Ended

Dec. 31, 2016

Compensation and Retirement Disclosure [Abstract]

Fair Value of Plan Assets and Major Categories

The fair value of plan assets and major categories as of December 31, 2016, is as follows:

Asset Category	Percent			Total		Level 1		Level 2		Level 3
(dollars in thousands)
Collective fund		59.3	%	$	22,209	$	4,708	$	17,501	$	—
Equity securities		19.7	%		7,363		7,363		—		—
Mutual funds		12.3	%		4,615		4,615		—		—
Hedge funds		7.4	%		2,786		—		—		2,786
Short-term investments		1.3	%		474		474		—		—
		100.0	%	$	37,447	$	17,160	$	17,501	$	2,786

The fair value of plan assets and major categories as of December 31, 2015, is as follows:

Asset Category	Percent			Total		Level 1		Level 2		Level 3
(dollars in thousands)
Collective fund		61.20	%	$	20,627	$	4,307	$	16,320	$	—
Equity securities		17.70	%		5,990		5,990		—		—
Mutual funds		11.90	%		4,001		4,001		—		—
Hedge funds		7.50	%		2,524		—		—		2,524
Short-term investments		1.70	%		575		575		—		—
		100.00	%	$	33,717	$	14,873	$	16,320	$	2,524

Changes in Level 3 Securities

The changes in Level 3 securities are shown in the table below:

Year Ended December 31,	2016			2015
(dollars in thousands)
Balance at beginning of year	$	2,524		$	2,360
Purchases		114			224
Redemptions		(309	)		(40	)
Actual return – assets still being held		457			(20	)
Balance at end of year	$	2,786		$	2,524

Components of Net Periodic Benefit Cost

	Defined Benefit Pension Plan						Supplemental Insurance/ Retirement Plan
	2016			2015			2016			2015
(dollars in thousands)
Change projected in benefit obligation
Benefit obligation at beginning of year	$	38,597		$	40,011		$	38,204		$	31,989
Service cost		1,273			1,343			1,820			1,589
Interest cost		1,358			1,576			1,334			1,365
Actuarial (gain)/loss		2,593			(3,424	)		(1,653	)		4,304
Benefits paid		(1,566	)		(909	)		(1,095	)		(1,043	)
Projected benefit obligation at end of year	$	42,255		$	38,597		$	38,610		$	38,204
Change in plan assets
Fair value of plan assets at beginning of year	$	33,717		$	33,812
Actual return on plan assets		3,221			(1,186	)
Employer contributions		2,075			2,000
Benefits paid		(1,566	)		(909	)
Fair value of plan assets at end of year	$	37,447		$	33,717
(Unfunded) Funded status	$	(4,808	)	$	(4,880	)	$	(38,610	)	$	(38,204	)
Accumulated benefit obligation	$	42,255		$	38,597		$	36,392		$	34,884
Weighted-average assumptions as of December 31
Discount rate — Liability		3.99	%		4.18	%		3.85	%		4.03	%
Discount rate — Expense		4.18	%		4.00	%		4.01	%		4.00	%
Expected return on plan assets		8.00	%		8.00	%		NA			NA
Rate of compensation increase		4.00	%		4.00	%		4.00	%		4.00	%
Components of net periodic benefit cost
Service cost	$	1,273		$	1,343		$	1,820		$	1,589
Interest cost		1,358			1,576			1,334			1,365
Expected return on plan assets		(2,776	)		(2,749	)		—			—
Recognized prior service cost		(104	)		(104	)		114			114
Recognized net losses		801			812			805			599
Net periodic cost (benefit)	$	552		$	878		$	4,073		$	3,667
Other changes in plan assets and benefit obligations recognized in other comprehensive income
Amortization of prior service cost	$	104		$	104		$	(114	)	$	(114	)
Net (gain) loss		1,347			(301	)		(2,458	)		3,705
Total recognized in other comprehensive income		1,451			(197	)		(2,572	)		3,591
Total recognized in net periodic benefit cost and other comprehensive income	$	2,003		$	681		$	1,501		$	7,258

Summary of Defined Pension Plan and Supplemental Insurance Retirement Plan

	December 31, 2016									December 31, 2015
	Plan			Supplemental Plan			Total			Plan			Supplemental Plan			Total
(dollars in thousands)
Prior service cost	$	204		$	(649	)	$	(445	)	$	308		$	(763	)	$	(455	)
Net actuarial loss		(13,999	)		(13,416	)		(27,415	)		(12,652	)		(15,874	)		(28,526	)
Total	$	(13,795	)	$	(14,065	)	$	(27,860	)	$	(12,344	)	$	(16,637	)	$	(28,981	)

Summary of Accumulated Other Comprehensive Loss Expected to be Recognized

The following table summarizes the amounts included in Accumulated Other Comprehensive Loss at December 31, 2016, expected to be recognized as components of net periodic benefit cost in the next year:

	Plan			Supplemental Plan
Amortization of prior service cost to be recognized in 2017	$	(104	)	$	114
Amortization of loss to be recognized in 2017		903			636

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

12 Months Ended

Dec. 31, 2016

Risks and Uncertainties [Abstract]

Summary of Financial Instruments with Off-Balance-Sheet Risk

Financial instruments with off-balance-sheet risk at December 31 are as follows:

Contract or Notional Amount

	2016		2015
(dollars in thousands)
Financial instruments whose contract amount represents credit risk:
Commitments to originate 1–4 family mortgages	$	13,877	$	5,638
Standby and commercial letters of credit		6,796		4,936
Unused lines of credit		362,357		320,874
Unadvanced portions of construction loans		22,049		11,589
Unadvanced portions of other loans		52,224		41,717

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Other Operating Expenses (Tables)

12 Months Ended

Dec. 31, 2016

Other Income and Expenses [Abstract]

Summary of Other Operating Expenses

Year ended December 31,	2016		2015		2014
(dollars in thousands)
Marketing	$	2,185	$	1,849	$	1,793
Software maintenance/amortization		1,863		1,670		1,524
Legal and audit		1,255		1,269		1,072
Contributions		789		690		735
Processing services		1,040		1,002		944
Consulting		1,168		1,050		964
Postage and delivery		987		905		964
Supplies		948		965		870
Telephone		1,032		804		753
Directors’ fees		413		377		389
Insurance		323		301		304
Other		1,812		1,826		1,520
Total	$	13,815	$	12,708	$	11,832

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Fair Values of Financial Instruments (Tables)

12 Months Ended

Dec. 31, 2016

Investments, All Other Investments [Abstract]

Carrying Amounts and Fair Values of Company's Financial Instruments

The following presents (in thousands) the carrying amount, estimated fair value, and placement in the fair value hierarchy of the Company’s financial instruments as of December 31, 2016 and December 31, 2015. This table excludes financial instruments for which the carrying amount approximates fair value. Financial assets for which the fair value approximates carrying value include cash and cash equivalents, short-term investments, FHLBB stock and accrued interest receivable. Financial liabilities for which the fair value approximates carrying value include non-maturity deposits, short-term borrowings and accrued interest payable.

	Carrying Amount		Estimated Fair Value		Level 1 Inputs		Fair Value Measurements Level 2 Inputs		Level 3 Inputs
(dollars in thousands)
December 31, 2016
Financial assets:
Securities held-to-maturity	$	1,653,986	$	1,635,808	$	—	$	1,635,808	$	—
Loans(1)		1,899,527		1,873,703		—		—		1,873,703
Financial liabilities:
Time deposits		478,359		480,133		—		480,133		—
Other borrowed funds		293,000		294,940		—		294,940		—
Subordinated debentures		36,083		36,083		—		—		36,083
December 31, 2015
Financial assets:
Securities held-to-maturity	$	1,438,903	$	1,438,960	$	—	$	1,438,960	$	—
Loans(1)		1,708,461		1,677,270		—		—		1,677,270
Financial liabilities:
Time deposits		473,426		474,046		—		474,046		—
Other borrowed funds		368,000		372,209		—		372,209		—
Subordinated debentures		36,083		36,083		—		—		36,083

(1) Comprised of loans (including collateral dependent impaired loans), net of deferred loan costs and the allowance for loan losses.

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Quarterly Results of Operations (Unaudited) (Tables)

12 Months Ended

Dec. 31, 2016

Quarterly Financial Information Disclosure [Abstract]

Quarterly Results of Operations (Unaudited)

2016 Quarters	Fourth			Third			Second		First
(in thousands, except share data)
Interest income	$	24,689		$	25,005		$	23,742	$	23,263
Interest expense		5,927			5,791			5,486		5,413
Net interest income		18,762			19,214			18,256		17,850
Provision for loan losses		200			375			350		450
Net interest income after provision for loan losses		18,562			18,839			17,906		17,400
Other operating income		3,700			4,225			4,643		3,654
Operating expenses		16,156			16,630			16,288		15,683
Income before income taxes		6,106			6,434			6,261		5,371
Provision for income taxes		(394	)		(52	)		20		64
Net income	$	6,500		$	6,486		$	6,241	$	5,307
Share data:
Average shares outstanding, basic
Class A		3,600,729			3,600,729			3,600,729		3,600,729
Class B		1,967,180			1,967,180			1,967,180		1,967,180
Average shares outstanding, diluted
Class A		5,567,909			5,567,909			5,567,909		5,567,909
Class B		1,967,180			1,967,180			1,967,180		1,967,180
Earnings per share, basic
Class A	$	1.42		$	1.41		$	1.36	$	1.16
Class B	$	0.71		$	0.71		$	0.68	$	0.58
Earnings per share, diluted
Class A	$	1.17		$	1.16		$	1.12	$	0.95
Class B	$	0.71		$	0.71		$	0.68	$	0.58
2015 Quarters	Fourth			Third			Second		First
(in thousands, except share data)
Interest income	$	22,496		$	23,750		$	22,675	$	21,172
Interest expense		5,274			5,134			4,961		4,765
Net interest income		17,222			18,616			17,714		16,407
Provision for loan losses		—			—			—		200
Net interest income after provision for loan losses		17,222			18,616			17,714		16,207
Other operating income		4,448			3,830			4,210		3,505
Operating expenses		15,794			16,100			15,766		14,538
Income before income taxes		5,876			6,346			6,158		5,174
Provision for income taxes		(95	)		180			233		215
Net income	$	5,971		$	6,166		$	5,925	$	4,959
Share data:
Average shares outstanding, basic
Class A		3,600,729			3,600,729			3,600,729		3,600,729
Class B		1,967,180			1,967,180			1,967,180		1,967,180
Average shares outstanding, diluted
Class A		5,567,909			5,567,909			5,567,909		5,567,909
Class B		1,976,180			1,967,180			1,967,180		1,967,180
Earnings per share, basic
Class A	$	1.30		$	1.35		$	1.29	$	1.08
Class B	$	0.65		$	0.67		$	0.65	$	0.54
Earnings per share, diluted
Class A	$	1.07		$	1.11		$	1.06	$	0.89
Class B	$	0.65		$	0.67		$	0.65	$	0.54

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Parent Company Financial Statements (Tables)

12 Months Ended

Dec. 31, 2016

Condensed Financial Information of Parent Company Only Disclosure [Abstract]

Balance Sheets of Parent Company

BALANCE SHEETS

December 31,	2016		2015
(dollars in thousands)
ASSETS:
Cash	$	2,768	$	5,230
Investment in subsidiary, at equity		263,070		236,629
Other assets		10,335		8,808
Total assets	$	276,173	$	250,667
LIABILITIES AND STOCKHOLDERS’ EQUITY:
Liabilities	$	49	$	40
Subordinated debentures		36,083		36,083
Stockholders’ equity		240,041		214,544
Total liabilities and stockholders’ equity	$	276,173	$	250,667

Statements of Income of Parent Company

STATEMENTS OF INCOME

Year Ended December 31,	2016			2015			2014
(dollars in thousands)
Income:
Dividends from subsidiary	$	2,000		$	1,500		$	—
Interest income from deposits in bank		3			13			21
Other income		28			24			72
Total income		2,031			1,537			93
Interest expense		937			792			2,329
Operating expenses		220			212			204
Income before income taxes and equity in undistributed income of subsidiary		874			533			(2,440	)
Benefit from income taxes		(383	)		(328	)		(830	)
Income before equity in undistributed income of subsidiary		1,257			861			(1,610	)
Equity in undistributed income of subsidiary		23,277			22,160			23,470
Net income	$	24,534		$	23,021		$	21,860

Statements of Cash Flows of Parent Company

STATEMENTS OF CASH FLOWS

December 31,	2016			2015			2014
(dollars in thousands)
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$	24,534		$	23,021		$	21,860
Adjustments to reconcile net income to net cash provided by operating activities
Undistributed income of subsidiary		(23,277	)		(22,160	)		(23,470	)
Depreciation and amortization		—			3			12
Increase in other assets		(1,527	)		(1,112	)		(1,067	)
Decrease in liabilities		9			4			(71	)
Net cash (used in) operating activities		(261	)		(244	)		(2,736	)
CASH FLOWS FROM FINANCING ACTIVITIES:
Net proceeds from the exercise of stock options		—			—			361
Cash dividends paid		(2,201	)		(2,200	)		(2,196	)
Net cash used in financing activities		(2,201	)		(2,200	)		(1,835	)
Net (decrease) in cash		(2,462	)		(2,444	)		(4,571	)
Cash at beginning of year		5,230			7,674			12,245
Cash at end of year	$	2,768		$	5,230		$	7,674

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Summary of Significant Accounting Policies - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2016 USD ($) Reporting_Unit Segment shares	Dec. 31, 2015 shares	Dec. 31, 2014 shares
Summary Of Significant Accounting Policies And Other Information [Line Items]
Number of reportable segments | Segment	1
Highly liquid assets, original maturity period	Three months or less
Highly liquid certificates of deposit, original maturity period	More than 90 days but less than one year
Securities held for trading | $	$ 0
Held-to-maturity substantial portion of principal outstanding	85.00%
Impairment recognized | $	$ 0
Loans discontinued delinquency period	90 days
Number of reporting units | Reporting_Unit	1
Goodwill impairment description	Goodwill impairment is evaluated by first assessing qualitative factors (events and circumstances) to determine whether it is more likely than not (meaning a likelihood of more than 50 percent) that the fair value of a reporting unit is less than its carrying amount. If, after considering all relevant events and circumstances, an entity determines it is not more likely than not that the fair value of a reporting unit is less than its carrying amount, then performing the two-step impairment test will be unnecessary.
Nonqualified stock options	85.00%
Options to purchase an aggregate of shares	0	0	0
Stock option granted	0	0
Maximum [Member]
Summary Of Significant Accounting Policies And Other Information [Line Items]
Time period over which stock option exercisable	10 years
Minimum [Member]
Summary Of Significant Accounting Policies And Other Information [Line Items]
Class A common stock entitled dividend per share percent in comparison to Class B common stock	200.00%
Supplemental plan	1 year
Loans Acquired with Deteriorated Credit Quality [Member]
Summary Of Significant Accounting Policies And Other Information [Line Items]
Non performing loans acquired | $	$ 0
Class A Common Stock [Member]
Summary Of Significant Accounting Policies And Other Information [Line Items]
Approved stock option plan for purchase of common stock	150,000
Options to purchase an aggregate of shares	0
Class A Common Stock [Member] | Minimum [Member]
Summary Of Significant Accounting Policies And Other Information [Line Items]
Class A common stock entitled dividend per share percent in comparison to Class B common stock	200.00%
Century Bancorp Capital Trust II [Member]
Summary Of Significant Accounting Policies And Other Information [Line Items]
Equity ownership interest	100.00%

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Cash and Due from Banks - Additional Information (Detail) - USD ($)	Dec. 31, 2016	Dec. 31, 2015
Cash and Due from Banks [Abstract]
Reserve balance of cash and due from banks	$ 0	$ 0

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Securities Available-for-Sale - Summary of Securities Available-for-Sale (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 500,220	$ 404,977
Gross Unrealized Gains	555	979
Gross Unrealized Losses	1,478	1,333
Total, Fair Value	499,297	404,623
U.S. Treasury [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	2,000	1,999
Gross Unrealized Losses		10
Total, Fair Value	2,000	1,989
U.S. Government Sponsored Enterprises [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	25,000
Gross Unrealized Losses	48
Total, Fair Value	24,952
SBA Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	57,899	5,983
Gross Unrealized Gains	14	8
Gross Unrealized Losses	146	2
Total, Fair Value	57,767	5,989
U.S. Government Agency and Sponsored Enterprises Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	243,703	232,967
Gross Unrealized Gains	293	859
Gross Unrealized Losses	671	300
Total, Fair Value	243,325	233,526
Privately Issued Residential Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	1,121	1,437
Gross Unrealized Gains	2	10
Gross Unrealized Losses	14	13
Total, Fair Value	1,109	1,434
Obligations Issued by States and Political Subdivisions [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	165,281	157,838
Gross Unrealized Losses	405	878
Total, Fair Value	164,876	156,960
Other Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	5,100	4,600
Gross Unrealized Gains	18	3
Gross Unrealized Losses	194	130
Total, Fair Value	4,924	4,473
Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	116	153
Gross Unrealized Gains	228	99
Total, Fair Value	$ 344	$ 252

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Securities Available-for-Sale - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2016 USD ($) Security	Dec. 31, 2015 USD ($) Security	Dec. 31, 2014 USD ($)
Schedule of Available-for-sale Securities [Line Items]
Securities at fair value pledged to secure public deposits and repurchase agreements	$ 1,147,207,000	$ 1,004,743,000
Securities available-for-sale are securities at fair value pledged for borrowing	53,396,000	20,056,000
Net gains on sales of securities	64,000	594,000	$ 450,000
Proceeds from sales of securities available-for-sale	2,376,000	$ 47,853,000	40,285,000
Securities at floating rate or adjustable rate	$ 301,253,000
Securities AFS [Member]
Schedule of Available-for-sale Securities [Line Items]
Weighted average remaining life of investment securities available-for-sale	4 years 4 months 24 days
Number of securities, temporarily impaired for less than 12 months | Security	49	14
Number of securities, temporarily impaired for 12 months or longer | Security	15	11
Number of securities, temporarily impaired, total | Security	270	290
Federal Home Loan Bank [Member]
Schedule of Available-for-sale Securities [Line Items]
Net gains on sales of securities	$ 52,000	$ 289,000	$ 450,000
U.S. Government Sponsored Enterprises [Member] | Securities AFS [Member]
Schedule of Available-for-sale Securities [Line Items]
Weighted average remaining life	15,000,000
Mortgage Backed Securities Issued by US Government Sponsored Enterprises and Small Business Administration [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities at fair value pledged to secure public deposits and repurchase agreements	$ 210,780,000	$ 220,482,000

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Securities Available-for-Sale - Estimated Maturity Distribution of Securities Available-for-Sale (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Investments, Debt and Equity Securities [Abstract]
Within one year, Amortized Cost	$ 173,276
After one but within five years, Amortized Cost	107,005
After five but within ten years, Amortized Cost	168,698
More than ten years, Amortized Cost	49,625
Non-maturing, Amortized Cost	1,616
Amortized Cost	500,220	$ 404,977
Within one year, Fair Value	173,263
After one but within five years, Fair Value	106,782
After five but within ten years, Fair Value	168,347
More than ten years, Fair Value	49,207
Non-maturing, Fair Value	1,698
Total, Fair Value	$ 499,297	$ 404,623

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Securities Available-for-Sale - Continuous Unrealized Loss Position for 12 Months or Less and 12 Months and Longer (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months, Fair Value	$ 213,363	$ 30,036
Less Than 12 Months, Unrealized Losses	725	67
12 Months or Longer, Fair Value	39,063	55,024
12 Months or Longer, Unrealized Losses	753	1,266
Total, Fair Value	252,426	85,060
Total, Unrealized Losses	1,478	1,333
U.S. Treasury [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months, Fair Value		1,989
Less Than 12 Months, Unrealized Losses		10
Total, Fair Value		1,989
Total, Unrealized Losses		10
SBA Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months, Fair Value	52,346	1,031
Less Than 12 Months, Unrealized Losses	145	2
12 Months or Longer, Fair Value	951
12 Months or Longer, Unrealized Losses	1
Total, Fair Value	53,297	1,031
Total, Unrealized Losses	146	2
U.S. Government Agency and Sponsored Enterprises Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months, Fair Value	135,612	26,519
Less Than 12 Months, Unrealized Losses	485	52
12 Months or Longer, Fair Value	31,504	49,341
12 Months or Longer, Unrealized Losses	186	248
Total, Fair Value	167,116	75,860
Total, Unrealized Losses	671	300
Privately Issued Residential Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
12 Months or Longer, Fair Value	757	490
12 Months or Longer, Unrealized Losses	14	13
Total, Fair Value	757	490
Total, Unrealized Losses	14	13
Obligations Issued by States and Political Subdivisions [Member]
Schedule of Available-for-sale Securities [Line Items]
12 Months or Longer, Fair Value	4,298	3,820
12 Months or Longer, Unrealized Losses	405	878
Total, Fair Value	4,298	3,820
Total, Unrealized Losses	405	878
Other Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months, Fair Value	453	497
Less Than 12 Months, Unrealized Losses	47	3
12 Months or Longer, Fair Value	1,553	1,373
12 Months or Longer, Unrealized Losses	147	127
Total, Fair Value	2,006	1,870
Total, Unrealized Losses	194	$ 130
U.S. Government Sponsored Enterprises [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months, Fair Value	24,952
Less Than 12 Months, Unrealized Losses	48
Total, Fair Value	24,952
Total, Unrealized Losses	$ 48

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Investment Securities Held-to-Maturity - Summary of Held-to-Maturity Securities (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	$ 1,653,986	$ 1,438,903
Gross Unrealized Gains	6,014	9,781
Gross Unrealized Losses	24,192	9,724
Estimated Fair Value	1,635,808	1,438,960
U.S. Government Sponsored Enterprises [Member]
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	148,326	186,734
Gross Unrealized Gains	1,066	2,234
Gross Unrealized Losses	527	141
Estimated Fair Value	148,865	188,827
SBA Backed Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	46,140
Gross Unrealized Losses	1,088
Estimated Fair Value	45,052
U.S. Government Agency and Sponsored Enterprises Mortgage-Backed Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	1,459,520	1,252,169
Gross Unrealized Gains	4,948	7,547
Gross Unrealized Losses	22,577	9,583
Estimated Fair Value	$ 1,441,891	$ 1,250,133

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Investment Securities Held-to-Maturity - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2016 USD ($) Security	Dec. 31, 2015 USD ($) Security	Dec. 31, 2014 USD ($)
Schedule of Held-to-maturity Securities [Line Items]
Securities at fair value pledged to secure public deposits and repurchase agreements	$ 1,147,207,000	$ 1,004,743,000
Realized gross gains from sales of securities held-to-maturity	12,000	305,000
Proceeds from sales of securities held-to-maturity	192,000	$ 3,698,000	$ 0
Securities held to maturity at floating rate or adjustable rate	$ 188,000
Held-to-Maturity Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Weighted average remaining life of investment securities held-to-maturity	4 years 6 months
Number of securities, temporarily impaired for less than 12 months | Security	194	101
Number of securities, temporarily impaired for 12 months or longer | Security	16	26
Number of securities, temporarily impaired, total | Security	375	322
Held-to-Maturity Securities [Member] | U.S. Government Sponsored Enterprises [Member]
Schedule of Held-to-maturity Securities [Line Items]
Weighted average remaining life	$ 59,745,000
Federal Home Loan Bank [Member]
Schedule of Held-to-maturity Securities [Line Items]
Securities pledged for borrowing at the Federal Home Loan Bank	$ 424,353,000	$ 432,965,000

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Investment Securities Held-to-Maturity - Company's Securities Held-to-Maturity (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Investments, Debt and Equity Securities [Abstract]
Within one year, Amortized Cost	$ 22,802
After one but within five years, Amortized Cost	1,122,678
After five but within ten years, Amortized Cost	500,355
More than ten years, Amortized Cost	8,151
Amortized Cost	1,653,986	$ 1,438,903
Within one year, Fair Value	22,911
After one but within five years, Fair Value	1,114,481
After five but within ten years, Fair Value	490,546
More than ten years, Fair Value	7,870
Estimated Fair Value	$ 1,635,808	$ 1,438,960

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Investment Securities Held-to-Maturity - Unrealized Market Loss of Securities (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Schedule of Held-to-maturity Securities [Line Items]
Less Than 12 Months, Fair Value	$ 1,113,231	$ 636,077
Less Than 12 Months, Unrealized Losses	22,340	6,798
12 Months or Longer, Fair Value	58,535	123,864
12 Months or Longer, Unrealized Losses	1,852	2,926
Total, Fair Value	1,171,766	759,941
Total, Unrealized Losses	24,192	9,724
U.S. Government Sponsored Enterprises [Member]
Schedule of Held-to-maturity Securities [Line Items]
Less Than 12 Months, Fair Value	59,219	9,859
Less Than 12 Months, Unrealized Losses	527	141
Total, Fair Value	59,219	9,859
Total, Unrealized Losses	527	141
U.S. Government Agency and Sponsored Enterprises Mortgage-Backed Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Less Than 12 Months, Fair Value	1,008,960	626,218
Less Than 12 Months, Unrealized Losses	20,725	6,657
12 Months or Longer, Fair Value	58,535	123,864
12 Months or Longer, Unrealized Losses	1,852	2,926
Total, Fair Value	1,067,495	750,082
Total, Unrealized Losses	22,577	$ 9,583
SBA Backed Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Less Than 12 Months, Fair Value	45,052
Less Than 12 Months, Unrealized Losses	1,088
Total, Fair Value	45,052
Total, Unrealized Losses	$ 1,088

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Loans - Summary of Composition of Loan Portfolio (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	$ 1,923,933	$ 1,731,536
Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	696,173	721,506
Residential Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	241,357	255,346
Consumer Portfolio Segment Other Than Overdrafts [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	11,013	10,744
Municipal [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	135,418	85,685
Construction and Land Development [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	14,928	27,421
Commercial and Industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	612,503	452,235
Home Equity [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	211,857	178,020
Overdrafts [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	$ 684	$ 579

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Loans - Additional Information (Detail) - USD ($)	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Debt Disclosure [Abstract]
Net of discount on loans	$ 313,000	$ 360,000
Net deferred fee	641,000	988,000
Mortgage loans sold to others	229,730,000	185,299,000
Loans held for sale	0	0
Mortgage servicing rights, net	1,629,000	1,305,000
Total recorded investment in impaired loans	3,830,000	3,225,000	$ 6,327,000
Impaired loans	3,105,000	3,051,000
Specific reserves	$ 173,000	$ 250,000

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Loans - Composition of Nonaccrual Loans and Impaired Loans (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Debt Disclosure [Abstract]
Loans on nonaccrual	$ 1,084	$ 2,336	$ 4,146
Loans 90 days past due and still accruing	0	0	0
Impaired loans on nonaccrual included above	304	332	3,031
Total recorded investment in impaired loans	3,830	3,225	6,327
Average recorded investment of impaired loans	3,661	4,490	7,434
Accruing troubled debt restructures	3,526	2,893	3,296
Interest income not recorded on nonaccrual loans according to their original terms	37	91	123
Interest income on nonaccrual loans actually recorded	0	0	0
Interest income recognized on impaired loans	$ 140	$ 104	$ 144

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Loans - Aggregate Amount of Loans to Directors and Officers of Company and Their Associates (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2016 USD ($)
Debt Disclosure [Abstract]
Beginning balance	$ 5,010
Additions	6,778
Repayments and Deletions	806
Ending balance	$ 10,982

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Allowance for Loan Losses - Analysis of Allowance for Loan Losses (Detail) - USD ($) $ in Thousands	3 Months Ended					12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Receivables [Abstract]
Allowance for loan losses, beginning of year				$ 23,075	$ 22,318	$ 23,075	$ 22,318	$ 20,941
Loans charged-off						(389)	(781)	(1,382)
Recoveries on loans previously charged-off						434	1,338	709
Net recoveries (charge-offs)						45	557	(673)
Provision charged to expense	$ 200	$ 375	$ 350	$ 450	$ 200	1,375	200	2,050
Reclassification to other liabilities						(89)
Allowance for loan losses, end of year	$ 24,406					$ 24,406	$ 23,075	$ 22,318

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Allowance for Loan Losses - Summary of Allowance for Loan Losses (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Allowance for loan losses:
Allowance for loan losses, beginning of year	$ 23,075	$ 22,318	$ 20,941
Charge-offs	(389)	(781)	(1,382)
Recoveries	434	1,338	709
Reclassification to other liabilities	(89)
Provision	1,375	200
Allowance for loan losses, end of year	24,406	23,075	22,318
Amount of allowance for loan losses for loans deemed to be impaired	173	250
Amount of allowance for loan losses for loans not deemed to be impaired	24,233	22,825
Loans:
Total loans, net	1,923,933	1,731,536
Loans deemed to be impaired	3,830	3,225	6,327
Loans not deemed to be impaired	1,920,103	1,728,311
Construction and Land Development [Member]
Allowance for loan losses:
Allowance for loan losses, beginning of year	2,041	1,592
Recoveries		780
Reclassification to other liabilities	(5)
Provision	(1,024)	(331)
Allowance for loan losses, end of year	1,012	2,041	1,592
Amount of allowance for loan losses for loans deemed to be impaired	3	10
Amount of allowance for loan losses for loans not deemed to be impaired	1,009	2,031
Loans:
Total loans, net	14,928	27,421
Loans deemed to be impaired	94	98
Loans not deemed to be impaired	14,834	27,323
Commercial and Industrial [Member]
Allowance for loan losses:
Allowance for loan losses, beginning of year	5,899	4,757
Charge-offs		(172)
Recoveries	132	212
Reclassification to other liabilities	(25)
Provision	966	1,102
Allowance for loan losses, end of year	6,972	5,899	4,757
Amount of allowance for loan losses for loans deemed to be impaired	23	19
Amount of allowance for loan losses for loans not deemed to be impaired	6,949	5,880
Loans:
Total loans, net	612,503	452,235
Loans deemed to be impaired	389	443
Loans not deemed to be impaired	612,114	451,792
Municipal [Member]
Allowance for loan losses:
Allowance for loan losses, beginning of year	994	1,488
Provision	618	(494)
Allowance for loan losses, end of year	1,612	994	1,488
Amount of allowance for loan losses for loans not deemed to be impaired	1,612	994
Loans:
Total loans, net	135,418	85,685
Loans not deemed to be impaired	135,418	85,685
Commercial Real Estate [Member]
Allowance for loan losses:
Allowance for loan losses, beginning of year	10,589	11,199
Charge-offs		(298)
Recoveries		84
Reclassification to other liabilities	(9)
Provision	555	(396)
Allowance for loan losses, end of year	11,135	10,589	11,199
Amount of allowance for loan losses for loans deemed to be impaired	140	99
Amount of allowance for loan losses for loans not deemed to be impaired	10,995	10,490
Loans:
Total loans, net	696,173	721,506
Loans deemed to be impaired	3,149	1,678
Loans not deemed to be impaired	693,024	719,828
Residential Real Estate [Member]
Allowance for loan losses:
Allowance for loan losses, beginning of year	1,320	776
Recoveries	6	7
Reclassification to other liabilities	(3)
Provision	375	537
Allowance for loan losses, end of year	1,698	1,320	776
Amount of allowance for loan losses for loans deemed to be impaired	7	32
Amount of allowance for loan losses for loans not deemed to be impaired	1,691	1,288
Loans:
Total loans, net	241,357	255,346
Loans deemed to be impaired	198	916
Loans not deemed to be impaired	241,159	254,430
Consumer [Member]
Allowance for loan losses:
Allowance for loan losses, beginning of year	644	810
Charge-offs	(362)	(311)
Recoveries	296	255
Reclassification to other liabilities	(3)
Provision	7	(110)
Allowance for loan losses, end of year	582	644	810
Amount of allowance for loan losses for loans not deemed to be impaired	582	644
Loans:
Total loans, net	11,697	11,323
Loans not deemed to be impaired	11,697	11,323
Home Equity [Member]
Allowance for loan losses:
Allowance for loan losses, beginning of year	1,077	599
Charge-offs	(27)
Reclassification to other liabilities	(44)
Provision	96	478
Allowance for loan losses, end of year	1,102	1,077	599
Amount of allowance for loan losses for loans deemed to be impaired		90
Amount of allowance for loan losses for loans not deemed to be impaired	1,102	987
Loans:
Total loans, net	211,857	178,020
Loans deemed to be impaired		90
Loans not deemed to be impaired	211,857	177,930
Unallocated [Member]
Allowance for loan losses:
Allowance for loan losses, beginning of year	511	1,097
Provision	(218)	(586)
Allowance for loan losses, end of year	293	511	$ 1,097
Amount of allowance for loan losses for loans not deemed to be impaired	$ 293	$ 511

XML

Allowance for Loan Losses - Loans by Risk Rating (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Loans by risk rating
Financing Receivable, Net	$ 1,923,933	$ 1,731,536
Construction and Land Development [Member]
Loans by risk rating
Financing Receivable, Net	14,928	27,421
Construction and Land Development [Member] | 1-3 (Pass) [Member]
Loans by risk rating
Financing Receivable, Net	14,834	20,281
Construction and Land Development [Member] | 4 (Monitor) [Member]
Loans by risk rating
Financing Receivable, Net		7,042
Construction and Land Development [Member] | Impaired [Member]
Loans by risk rating
Financing Receivable, Net	94	98
Commercial and Industrial [Member]
Loans by risk rating
Financing Receivable, Net	612,503	452,235
Commercial and Industrial [Member] | 1-3 (Pass) [Member]
Loans by risk rating
Financing Receivable, Net	612,114	451,774
Commercial and Industrial [Member] | 4 (Monitor) [Member]
Loans by risk rating
Financing Receivable, Net		18
Commercial and Industrial [Member] | Impaired [Member]
Loans by risk rating
Financing Receivable, Net	389	443
Municipal [Member]
Loans by risk rating
Financing Receivable, Net	135,418	85,685
Municipal [Member] | 1-3 (Pass) [Member]
Loans by risk rating
Financing Receivable, Net	135,418	85,685
Commercial Real Estate [Member]
Loans by risk rating
Financing Receivable, Net	696,173	721,506
Commercial Real Estate [Member] | 1-3 (Pass) [Member]
Loans by risk rating
Financing Receivable, Net	661,271	718,911
Commercial Real Estate [Member] | 4 (Monitor) [Member]
Loans by risk rating
Financing Receivable, Net	31,753	917
Commercial Real Estate [Member] | Impaired [Member]
Loans by risk rating
Financing Receivable, Net	$ 3,149	$ 1,678

XML

Allowance for Loan Losses - Loans by Credit Rating (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Financing Receivable, Recorded Investment [Line Items]
Loans and leases receivable net of deferred income credit quality	$ 917,026	$ 765,695
Aaa - Aa3 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and leases receivable net of deferred income credit quality	407,515	306,145
A1 - A3 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and leases receivable net of deferred income credit quality	351,565	278,691
Baa1 - Baa3 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and leases receivable net of deferred income credit quality	154,336	176,379
Ba2 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and leases receivable net of deferred income credit quality	3,610	4,480
Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and leases receivable net of deferred income credit quality	523,451	375,152
Commercial and Industrial [Member] | Aaa - Aa3 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and leases receivable net of deferred income credit quality	334,674	234,733
Commercial and Industrial [Member] | A1 - A3 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and leases receivable net of deferred income credit quality	188,777	140,419
Municipal [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and leases receivable net of deferred income credit quality	130,190	84,635
Municipal [Member] | Aaa - Aa3 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and leases receivable net of deferred income credit quality	66,245	63,865
Municipal [Member] | A1 - A3 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and leases receivable net of deferred income credit quality	33,365	7,400
Municipal [Member] | Baa1 - Baa3 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and leases receivable net of deferred income credit quality	26,970	8,890
Municipal [Member] | Ba2 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and leases receivable net of deferred income credit quality	3,610	4,480
Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and leases receivable net of deferred income credit quality	263,385	305,908
Commercial Real Estate [Member] | Aaa - Aa3 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and leases receivable net of deferred income credit quality	6,596	7,547
Commercial Real Estate [Member] | A1 - A3 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and leases receivable net of deferred income credit quality	129,423	130,872
Commercial Real Estate [Member] | Baa1 - Baa3 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and leases receivable net of deferred income credit quality	$ 127,366	$ 167,489

XML

Allowance for Loan Losses - Aging of Past Due Loans (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Financing Receivable, Allowance for Credit Losses [Line Items]
Accruing 30-89 Days Past Due	$ 1,614	$ 2,692
Non Accrual	1,084	2,336	$ 4,146
Total Past Due	2,698	5,028
Current Loans	1,921,235	1,726,508
Total loans, net	1,923,933	1,731,536
Construction and Land Development [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Non Accrual	94	99
Total Past Due	94	99
Current Loans	14,834	27,322
Total loans, net	14,928	27,421
Commercial and Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Accruing 30-89 Days Past Due	37
Non Accrual	65	60
Total Past Due	102	60
Current Loans	612,401	452,175
Total loans, net	612,503	452,235
Municipal [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Current Loans	135,418	85,685
Total loans, net	135,418	85,685
Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Accruing 30-89 Days Past Due	597	1,462
Non Accrual	150	174
Total Past Due	747	1,636
Current Loans	695,426	719,870
Total loans, net	696,173	721,506
Residential Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Accruing 30-89 Days Past Due	245	596
Non Accrual	656	1,559
Total Past Due	901	2,155
Current Loans	240,456	253,191
Total loans, net	241,357	255,346
Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Accruing 30-89 Days Past Due		6
Non Accrual	11
Total Past Due	11	6
Current Loans	11,686	11,317
Total loans, net	11,697	11,323
Home Equity [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Accruing 30-89 Days Past Due	735	628
Non Accrual	108	444
Total Past Due	843	1,072
Current Loans	211,014	176,948
Total loans, net	$ 211,857	$ 178,020

XML

Allowance for Loan Losses - Information Pertaining to Impaired Loans (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Financing Receivable, Allowance for Credit Losses [Line Items]
With no required reserve recorded, Carrying Value	$ 725	$ 174
With no required reserve recorded, Unpaid Balance Principal	1,001	446
With no required reserve recorded, Required Reserve	0	0
With no required reserve recorded, Average Carrying Value Recognized	530	308
With no required reserve recorded, Interest Income	46	8
With required reserve recorded, Carrying Value	3,105	3,051
With required reserve recorded, Unpaid Balance Principal	3,241	3,175
With required reserve recorded, Required Reserve	173	250
With required reserve recorded, Average Carrying Value Recognized	3,131	4,182
With required reserve recorded, Interest Income	94	96
Carrying Value	3,830	3,225	$ 6,327
Unpaid Balance Principal	4,242	3,621
With required reserve recorded, Required Reserve	173	250
Average Carrying Value Recognized	3,661	4,490	$ 7,434
Interest Income	140	104
Construction and Land Development [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
With no required reserve recorded, Required Reserve	0	0
With required reserve recorded, Carrying Value	94	98
With required reserve recorded, Unpaid Balance Principal	108	108
With required reserve recorded, Required Reserve	3	10
With required reserve recorded, Average Carrying Value Recognized	96	101
Carrying Value	94	98
Unpaid Balance Principal	108	108
With required reserve recorded, Required Reserve	3	10
Average Carrying Value Recognized	96	101
Commercial and Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
With no required reserve recorded, Carrying Value	45	60
With no required reserve recorded, Unpaid Balance Principal	232	246
With no required reserve recorded, Required Reserve	0	0
With no required reserve recorded, Average Carrying Value Recognized	53	32
With required reserve recorded, Carrying Value	344	383
With required reserve recorded, Unpaid Balance Principal	360	399
With required reserve recorded, Required Reserve	23	19
With required reserve recorded, Average Carrying Value Recognized	360	626
With required reserve recorded, Interest Income	18	20
Carrying Value	389	443
Unpaid Balance Principal	592	645
With required reserve recorded, Required Reserve	23	19
Average Carrying Value Recognized	413	658
Interest Income	18	20
Municipal [Member] | Municipal [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
With no required reserve recorded, Required Reserve	0	0
Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
With no required reserve recorded, Carrying Value	590
With no required reserve recorded, Unpaid Balance Principal	590
With no required reserve recorded, Required Reserve	0	0
With no required reserve recorded, Average Carrying Value Recognized	375	151
With no required reserve recorded, Interest Income	39
With required reserve recorded, Carrying Value	2,559	1,678
With required reserve recorded, Unpaid Balance Principal	2,665	1,776
With required reserve recorded, Required Reserve	140	99
With required reserve recorded, Average Carrying Value Recognized	2,324	2,550
With required reserve recorded, Interest Income	71	69
Carrying Value	3,149	1,678
Unpaid Balance Principal	3,255	1,776
With required reserve recorded, Required Reserve	140	99
Average Carrying Value Recognized	2,699	2,701
Interest Income	110	69
Residential Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
With no required reserve recorded, Carrying Value	90	114
With no required reserve recorded, Unpaid Balance Principal	179	200
With no required reserve recorded, Required Reserve	0	0
With no required reserve recorded, Average Carrying Value Recognized	102	125
With no required reserve recorded, Interest Income	7	8
With required reserve recorded, Carrying Value	108	802
With required reserve recorded, Unpaid Balance Principal	108	802
With required reserve recorded, Required Reserve	7	32
With required reserve recorded, Average Carrying Value Recognized	323	814
With required reserve recorded, Interest Income	5	7
Carrying Value	198	916
Unpaid Balance Principal	287	1,002
With required reserve recorded, Required Reserve	7	32
Average Carrying Value Recognized	425	939
Interest Income	12	15
Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
With no required reserve recorded, Required Reserve	0	0
Home Equity [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
With no required reserve recorded, Required Reserve	0	0
With required reserve recorded, Carrying Value		90
With required reserve recorded, Unpaid Balance Principal		90
With required reserve recorded, Required Reserve		90
With required reserve recorded, Average Carrying Value Recognized	28	91
Carrying Value		90
Unpaid Balance Principal		90
With required reserve recorded, Required Reserve		90
Average Carrying Value Recognized	$ 28	$ 91

XML

Allowance for Loan Losses - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2016 USD ($) Contracts	Dec. 31, 2015 USD ($)
Financing Receivable, Allowance for Credit Losses [Line Items]
Troubled debt restructurings, subsequently defaulted	$ 0	$ 0
Commitment to lend additional funds to TDR borrowers		$ 0
Commercial Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Number of troubled debt restructurings | Contracts	1
Pre-modification outstanding recorded investment	$ 2,091,000
Post-modification outstanding recorded investment	2,091,000
Financing allowance reduction in principal payments	16,000
Financing allowance reduction in interest payments	$ 5,000

XML

Bank Premises and Equipment - Schedule of Bank Premises and Equipment (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Property, Plant and Equipment [Line Items]
Bank premises and equipment, gross	$ 61,823	$ 59,773
Accumulated depreciation and amortization	(38,406)	(35,667)
Total	23,417	24,106
Land [Member]
Property, Plant and Equipment [Line Items]
Bank premises and equipment, gross	3,478	3,478
Bank Premises [Member]
Property, Plant and Equipment [Line Items]
Bank premises and equipment, gross	19,272	19,272
Furniture and Equipment [Member]
Property, Plant and Equipment [Line Items]
Bank premises and equipment, gross	26,271	24,131
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Bank premises and equipment, gross	$ 12,802	$ 12,892
Minimum [Member] | Bank Premises [Member]
Property, Plant and Equipment [Line Items]
Estimated Useful Life	30 years
Minimum [Member] | Furniture and Equipment [Member]
Property, Plant and Equipment [Line Items]
Estimated Useful Life	3 years
Minimum [Member] | Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Estimated Useful Life	30 years
Maximum [Member] | Bank Premises [Member]
Property, Plant and Equipment [Line Items]
Estimated Useful Life	39 years
Maximum [Member] | Furniture and Equipment [Member]
Property, Plant and Equipment [Line Items]
Estimated Useful Life	10 years
Maximum [Member] | Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Estimated Useful Life	39 years

XML

Bank Premises and Equipment - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Property, Plant and Equipment [Line Items]
Lease expense	$ 2,834,000	$ 2,755,000	$ 2,465,000
Lease rental income	$ 318,000	314,000	307,000
Operating lease premises and equipment lease expiration year, maximum	2026
Depreciation of leased property	$ 3,099,000	2,728,000	2,322,000
Marshall M Sloane [Member]
Property, Plant and Equipment [Line Items]
Lease expense	$ 424,000	$ 413,000	$ 208,000

XML

Bank Premises and Equipment - Summary of Future Minimum Rental Commitments for Non-Cancelable Operating Leases (Detail) $ in Thousands	Dec. 31, 2016 USD ($)
Property, Plant and Equipment [Abstract]
2017	$ 2,408
2018	2,222
2019	2,054
2020	1,777
2021	1,326
Thereafter	2,526
Future minimum rental commitments for non-cancelable operating leases, total	$ 12,313

XML

Goodwill and Identifiable Intangible Assets - Carrying Amount of Goodwill and Intangibles (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Intangible Assets And Goodwill [Line Items]
Goodwill, Beginning Balance	$ 2,714	$ 2,714	$ 2,714
Total, Beginning Balance	4,019	3,655
Additions	708	626
Amortization Expense	(384)	(262)
Total, Ending Balance	4,343	4,019
Mortgage Servicing Rights [Member]
Intangible Assets And Goodwill [Line Items]
Beginning Balance	1,305	941
Additions	708	626
Amortization Expense	(384)	(262)
Ending Balance	$ 1,629	$ 1,305

XML

Fair Value Measurements - Financial Instruments Measured at Fair Value on a Recurring and Non-recurring Basis (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities AFS	$ 499,297	$ 404,623
Fair Value Measurements, Level 1 Inputs [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities AFS	344	215
Fair Value Measurements, Level 2 Inputs [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities AFS	334,077	247,411
Fair Value Measurements, Level 3 Inputs [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities AFS	164,876	156,997
Financial Instruments Measured at Fair Value on a Non-recurring Basis
Impaired Loans	260	1,056
U.S. Treasury [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities AFS	2,000	1,989
U.S. Treasury [Member] | Fair Value Measurements, Level 2 Inputs [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities AFS	2,000	1,989
SBA Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities AFS	57,767	5,989
SBA Backed Securities [Member] | Fair Value Measurements, Level 2 Inputs [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities AFS	57,767	5,989
U.S. Government Agency and Sponsored Enterprises Mortgage-Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities AFS	243,325	233,526
U.S. Government Agency and Sponsored Enterprises Mortgage-Backed Securities [Member] | Fair Value Measurements, Level 2 Inputs [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities AFS	243,325	233,526
Privately Issued Residential Mortgage-Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities AFS	1,109	1,434
Privately Issued Residential Mortgage-Backed Securities [Member] | Fair Value Measurements, Level 2 Inputs [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities AFS	1,109	1,434
Obligations Issued by States and Political Subdivisions [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities AFS	164,876	156,960
Obligations Issued by States and Political Subdivisions [Member] | Fair Value Measurements, Level 3 Inputs [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities AFS	164,876	156,960
Other Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities AFS	4,924	4,473
Other Debt Securities [Member] | Fair Value Measurements, Level 2 Inputs [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities AFS	4,924	4,473
Equity Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities AFS	344	252
Equity Securities [Member] | Fair Value Measurements, Level 1 Inputs [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities AFS	344	215
Equity Securities [Member] | Fair Value Measurements, Level 3 Inputs [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities AFS		37
U.S. Government Sponsored Enterprises [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities AFS	24,952
U.S. Government Sponsored Enterprises [Member] | Fair Value Measurements, Level 2 Inputs [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities AFS	24,952
Carrying Value [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities AFS	499,297	404,623
Financial Instruments Measured at Fair Value on a Non-recurring Basis
Impaired Loans	260	1,056
Carrying Value [Member] | U.S. Treasury [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities AFS	2,000	1,989
Carrying Value [Member] | SBA Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities AFS	57,767	5,989
Carrying Value [Member] | U.S. Government Agency and Sponsored Enterprises Mortgage-Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities AFS	243,325	233,526
Carrying Value [Member] | Privately Issued Residential Mortgage-Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities AFS	1,109	1,434
Carrying Value [Member] | Obligations Issued by States and Political Subdivisions [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities AFS	164,876	156,960
Carrying Value [Member] | Other Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities AFS	4,924	4,473
Carrying Value [Member] | Equity Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities AFS	344	$ 252
Carrying Value [Member] | U.S. Government Sponsored Enterprises [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities AFS	$ 24,952

XML

Fair Value Measurements - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Specific adjustments to impaired loans recognized	$ (135,000)	$ (165,000)
Transfers between level 1, 2 and 3	0
Liabilities measured at fair value on a recurring or nonrecurring basis	0
Transfers between level 1 and 2		0
Liabilities measured at fair value on a recurring or nonrecurring basis		0
Fair Value Measurements, Level 3 Inputs [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Amortized cost of Level 3 securities	165,281,000	157,874,000
Unrealized loss	$ 405,000	$ 877,000

XML

Fair Value Measurements - Assets Measured at Fair Value (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Securities AFS [Member]
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
Fair Value	$ 164,876	$ 156,997
Valuation Technique	Discounted cash flow
Unobservable Input	Discount rate
Impaired Loans [Member]
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
Fair Value	$ 260	$ 1,056
Valuation Technique	Appraisal of collateral
Unobservable Input	Appraisal adjustments
Minimum [Member] | Securities AFS [Member]
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
Unobservable Input Value or Range	0.00%	0.00%
Minimum [Member] | Impaired Loans [Member]
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
Unobservable Input Value or Range	0.00%	0.00%
Maximum [Member] | Securities AFS [Member]
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
Unobservable Input Value or Range	1.00%	1.00%
Maximum [Member] | Impaired Loans [Member]
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
Unobservable Input Value or Range	30.00%	30.00%

XML

Fair Value Measurements - Assets Measured at Fair Value (Parenthetical) (Detail)	12 Months Ended
	Dec. 31, 2016
Municipal [Member]
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
Securities maturity period	one year or less

XML

Fair Value Measurements - Changes in Level 3 Securities (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning Balance	$ 156,997	$ 96,886
Purchases	216,646	207,509
Maturities/redemptions	(209,027)	(147,342)
Amortization	(218)	(56)
Change in fair value	478
Ending Balance	164,876	156,997
Auction Rate Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning Balance	3,820	3,820
Change in fair value	478
Ending Balance	4,298	3,820
Obligations Issued by States and Political Subdivisions [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning Balance	153,140	92,964
Purchases	216,646	207,509
Maturities/redemptions	(208,990)	(147,277)
Amortization	(218)	(56)
Ending Balance	160,578	153,140
Equity Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning Balance	37	102
Maturities/redemptions	$ (37)	(65)
Ending Balance		$ 37

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Deposits - Summary of Remaining Maturities or Re-pricing of Time Deposits (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Maturities of Time Deposits [Abstract]
Within one year	$ 262,406	$ 315,559
Over one year to two years	87,952	44,838
Over two years to three years	83,067	49,538
Over three years to five years	44,934	63,491
Time Deposits, Total	$ 478,359	$ 473,426
Within one year, Percent	55.00%	67.00%
Over one year to two years, Percent	18.00%	9.00%
Over two years to three years, Percent	17.00%	10.00%
Over three years to five years, Percent	10.00%	14.00%
Total, Percent	100.00%	100.00%

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Deposits - Additional Information (Detail) - USD ($)	Dec. 31, 2016	Dec. 31, 2015
Banking and Thrift [Abstract]
Time deposits 250000 or more	$ 250,476,000	$ 193,598,000
Deposits to related parties	$ 26,191,000	$ 21,970,000

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Securities Sold under Agreements to Repurchase - Summary of Securities Sold Under Agreements to Repurchase (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Banking and Thrift [Abstract]
Amount outstanding at December 31	$ 182,280,000	$ 197,850,000	$ 212,360,000
Weighted average rate at December 31	0.21%	0.21%	0.18%
Maximum amount outstanding at any month end	$ 241,110,000	$ 299,890,000	$ 243,750,000
Daily average balance outstanding during the year	$ 222,956,000	$ 245,276,000	$ 216,937,000
Weighted average rate during the year	0.21%	0.20%	0.18%

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Securities Sold under Agreements to Repurchase - Additional Information (Detail) - U.S. Government Sponsored Enterprises [Member] - USD ($)	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Assets Sold under Agreements to Repurchase [Line Items]
U.S. Government Sponsored Enterprise securities with a total amortized cost	$ 183,829,000	$ 199,152,000	$ 213,817,000
Fair value of the collateral repurchase agreement	$ 182,074,000	$ 197,318,000	$ 212,255,000

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Other Borrowed Funds and Subordinated Debentures - Summary of Other Borrowed Funds and Subordinated Debentures (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Debt Disclosure [Abstract]
Amount outstanding at December 31	$ 329,083,000	$ 404,083,000	$ 431,583,000
Weighted average rate at December 31	2.39%	2.29%	1.91%
Maximum amount outstanding at any month end	$ 467,083,000	$ 521,583,000	$ 431,583,000
Daily average balance outstanding during the year	$ 357,974,000	$ 374,109,000	$ 271,710,000
Weighted average rate during the year	2.48%	2.38%	3.34%

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Other Borrowed Funds and Subordinated Debentures - Additional Information (Detail) - USD ($)	1 Months Ended	12 Months Ended
	Dec. 31, 2004	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Debt Instrument [Line Items]
FHLBB advances		$ 45,000,000	$ 55,000,000	$ 35,000,000
Subordinated debt securities issued		36,083,000	36,083,000
Century Bancorp Capital Trust II [Member]
Debt Instrument [Line Items]
Subordinated debt securities issued	$ 36,083,000
Subordinated debt securities due year	2034
Federal Home Loan Bank Borrowings [Member]
Debt Instrument [Line Items]
Bank's remaining term borrowing capacity at the FHLBB		239,163,000
Line of credit with the FHLBB		$ 14,500,000
Subordinated Debt [Member] | Century Bancorp Capital Trust II [Member]
Debt Instrument [Line Items]
Liquidation value of shares of cumulative trust preferred securities		$ 1,000
Period of dividend		10 years
LIBOR rate		Three-month LIBOR rate plus 1.87% for the remaining 20 years
LIBOR rate trust preferred securities		1.87%
Duration of LIBOR rate		20 years
Investment coupon rate		2.83%
Other Borrowed Funds [Member]
Debt Instrument [Line Items]
Federal funds purchased		$ 0	$ 0
Cumulative Preferred Stock Subject to Mandatory Redemption [Member] | Subordinated Debt [Member] | Century Bancorp Capital Trust II [Member]
Debt Instrument [Line Items]
Shares of cumulative trust preferred securities		35,000
Trust preferred securities annual dividend rate		6.65%

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Other Borrowed Funds and Subordinated Debentures - Schedule of the Maturity Distribution of FHLBB Advances with the Weighted Average Interest Rates (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Federal Home Loan Bank, Advances, Fiscal Year Maturity [Abstract]
Within one year	$ 77,500	$ 100,000	$ 169,500
Over one year to two years	54,500	57,500	55,000
Over two years to three years	58,000	54,500	45,000
Over three years to five years	58,000	91,000	70,000
Over five years	45,000	65,000	56,000
Federal Home Loan Bank, Advances, Total	$ 293,000	$ 368,000	$ 395,500
Within one year, Weighted Average Rate	2.21%	1.89%	0.51%
Over one year to two years, Weighted Average Rate	2.25%	2.72%	3.07%
Over two years to three years, Weighted Average Rate	1.87%	2.25%	3.18%
Over three years to five years, Weighted Average Rate	2.68%	1.85%	2.43%
Over five years, Weighted Average Rate	2.85%	3.23%	3.16%
Weighted Average Rate, Total	2.34%	2.30%	1.89%

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Reclassifications Out of Accumulated Other Comprehensive Income - Reclassifications Out of Accumulated Other Comprehensive Income (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net gains on sales of securities									$ 64	$ 594	$ 450
Provision for income taxes	$ 394	$ 52	$ (20)	$ (64)	$ 95	$ (180)	$ (233)	$ (215)	362	(533)	(866)
Net income	$ 6,500	$ 6,486	$ 6,241	$ 5,307	$ 5,971	$ 6,166	$ 5,925	$ 4,959	24,534	23,021	21,860
Salaries and employee benefits									(40,048)	(38,596)	$ (35,096)
Reclassification Out of Accumulated Other Comprehensive Income [Member] | Unrealized Gains and Losses on Available-for-Sale Securities [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net gains on sales of securities									52	594
Provision for income taxes									(20)	(233)
Net income									32	361
Reclassification Out of Accumulated Other Comprehensive Income [Member] | Accretion of Unrealized Losses Transferred [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net gains on sales of securities									(4,317)	(5,502)
Provision for income taxes									1,505	1,919
Net income									(2,812)	(3,583)
Reclassification Out of Accumulated Other Comprehensive Income [Member] | Prior-Service Costs [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Salaries and employee benefits									(10)	(10)
Reclassification Out of Accumulated Other Comprehensive Income [Member] | Actuarial Gains (Losses) [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Salaries and employee benefits									(1,606)	(1,411)
Reclassification Out of Accumulated Other Comprehensive Income [Member] | Amortization of Defined Benefit Pension Items [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Income before taxes									(1,616)	(1,421)
Provision for income taxes									646	568
Net income									$ (970)	$ (853)

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Earnings per Share ("EPS") - Additional Information (Detail) - shares	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Minimum [Member]
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Class A common stock entitled dividend per share percent in comparison to Class B common stock	200.00%
Class A Common Stock [Member]
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Dilutive effect of stock options, increment in shares	0	0	1,447
Class A Common Stock [Member] | Minimum [Member]
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Class A common stock entitled dividend per share percent in comparison to Class B common stock	200.00%

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Earnings Per Share ("EPS") - Reconciliation of Basic EPS and Diluted EPS (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net income	$ 6,500	$ 6,486	$ 6,241	$ 5,307	$ 5,971	$ 6,166	$ 5,925	$ 4,959	$ 24,534	$ 23,021	$ 21,860
Class A Common Stock [Member]
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net income									$ 19,270	$ 18,081	$ 17,157
Weighted average shares outstanding, basic	3,600,729	3,600,729	3,600,729	3,600,729	3,600,729	3,600,729	3,600,729	3,600,729	3,600,729	3,600,729	3,591,732
Basic earnings per share	$ 1.42	$ 1.41	$ 1.36	$ 1.16	$ 1.30	$ 1.35	$ 1.29	$ 1.08	$ 5.35	$ 5.02	$ 4.78
Dilutive effect of Class A stock options									0	0	1,447
Weighted average shares outstanding, diluted	5,567,909	5,567,909	5,567,909	5,567,909	5,567,909	5,567,909	5,567,909	5,567,909	5,567,909	5,567,909	5,562,209
Diluted earnings per share	$ 1.17	$ 1.16	$ 1.12	$ 0.95	$ 1.07	$ 1.11	$ 1.06	$ 0.89	$ 4.41	$ 4.13	$ 3.93
Class B Common Stock [Member]
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net income									$ 5,264	$ 4,940	$ 4,703
Weighted average shares outstanding, basic	1,967,180	1,967,180	1,967,180	1,967,180	1,967,180	1,967,180	1,967,180	1,967,180	1,967,180	1,967,180	1,969,030
Basic earnings per share	$ 0.71	$ 0.71	$ 0.68	$ 0.58	$ 0.65	$ 0.67	$ 0.65	$ 0.54	$ 2.68	$ 2.51	$ 2.39
Weighted average shares outstanding, diluted	1,967,180	1,967,180	1,967,180	1,967,180	1,976,180	1,967,180	1,967,180	1,967,180	1,967,180	1,967,180	1,969,030
Diluted earnings per share	$ 0.71	$ 0.71	$ 0.68	$ 0.58	$ 0.65	$ 0.67	$ 0.65	$ 0.54	$ 2.68	$ 2.51	$ 2.39

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Stockholders' Equity - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2014	Dec. 31, 2015	Dec. 31, 2013
Class of Stock [Line Items]
Number of outstanding options				20,375
Stock Option Plan [Member]
Class of Stock [Line Items]
Number of outstanding options	0		0
Weighted average intrinsic value of options exercised		$ 8.76
Aggregate value of weighted average intrinsic value of options exercised		$ 99,217
Minimum [Member]
Class of Stock [Line Items]
Class A common stock entitled dividend per share percent in comparison to Class B common stock	200.00%
Minimum [Member] | Stock Option Plan [Member]
Class of Stock [Line Items]
Share based compensation of option price based on fair value	85.00%
Maximum [Member] | Stock Option Plan [Member]
Class of Stock [Line Items]
Share based compensation number of share authorized	150,000
Stock option exercisable period	10 years

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Stockholders' Equity - Summary of Stock Option Activity under Stock Option Plan (Detail) - $ / shares	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2016	Dec. 31, 2015
Shares under option:
Outstanding at beginning of year, Amount	20,375
Forfeited, Amount	(9,050)
Exercised, Amount	(11,325)
Exercisable at end of year, Amount	0
Available to be granted at end of year, Amount	233,934	233,934	233,934
Outstanding at beginning of year, Weighted Average Exercise Price	$ 31.82
Forfeited, Weighted Average Exercise Price	31.83
Exercised, Weighted Average Exercise Price	31.81
Outstanding at end of year, Weighted Average Exercise Price	0
Exercisable at end of year, Weighted Average Exercise Price	$ 0

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Stockholders' Equity - Summary of the Bank's Actual Capital Amounts and Ratios (Detail) - Century Bancorp Capital Trust II [Member] - USD ($)	Dec. 31, 2016	Dec. 31, 2015
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total Capital (to Risk-Weighted Assets), Actual Amount	$ 293,143	$ 278,769
Tier 1 Capital (to Risk-Weighted Assets), Actual Amount	268,737	255,694
Common Equity Tier 1 Capital (to Risk-Weighted Assets), Actual Amount	268,737	255,694
Tier 1 Capital (to 4th Qtr. Average Assets), Actual Amount	$ 268,737	$ 255,964
Total Capital (to Risk-Weighted Assets), Ratio	12.27%	12.03%
Tier 1 Capital (to Risk-Weighted Assets), Ratio	11.25%	11.04%
Common Equity Tier 1 Capital (to Risk-Weighted Assets), Ratio	11.25%	11.04%
Tier 1 Capital (to 4th Qtr. Average Assets), Ratio	6.02%	6.48%
Total Capital (to Risk-Weighted Assets), Capital Adequacy Amount	$ 191,081	$ 185,320
Tier 1 Capital (to Risk-Weighted Assets), Capital Adequacy Amount	143,311	138,990
Common Equity Tier 1 Capital (to Risk-Weighted Assets), Capital Adequacy Amount	107,483	104,242
Tier 1 Capital (to 4th Qtr. Average Assets), Capital Adequacy Amount	$ 178,469	$ 157,734
Total Capital (to Risk-Weighted Assets), Capital Adequacy Ratio	8.00%	8.00%
Tier 1 Capital (to Risk-Weighted Assets), Capital Adequacy Ratio	6.00%	6.00%
Common Equity Tier 1 Capital (to Risk-Weighted Assets), Capital Adequacy Ratio	4.50%	4.50%
Tier 1 Capital (to 4th Qtr. Average Assets), Capital Adequacy Ratio	4.00%	4.00%
Total Capital (to Risk-Weighted Assets), Well Capitalized Amount	$ 238,851	$ 231,650
Tier 1 Capital (to Risk-Weighted Assets), Well Capitalized Amount	191,081	185,320
Common Equity Tier 1 Capital (to Risk-Weighted Assets), Well Capitalized Amount	155,253	150,572
Tier 1 Capital (to 4th Qtr. Average Assets), Well Capitalized Amount	$ 223,086	$ 197,167
Total Capital (to Risk-Weighted Assets), Well Capitalized Ratio	10.00%	10.00%
Tier 1 Capital (to Risk-Weighted Assets), Well Capitalized Ratio	8.00%	8.00%
Common Equity Tier 1 Capital (to Risk-Weighted Assets), Well Capitalized Ratio	6.50%	6.50%
Tier 1 Capital (to 4th Qtr. Average Assets), Well Capitalized Ratio	5.00%	5.00%

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Stockholders' Equity - Summary of the Company's Actual Capital Amounts and Ratios (Detail) - Company [Member] - USD ($)	Dec. 31, 2016	Dec. 31, 2015
Compliance with Regulatory Capital Requirements for Mortgage Companies [Line Items]
Total Capital (to Risk-Weighted Assets), Actual Amount	$ 305,065	$ 291,635
Tier 1 Capital (to Risk-Weighted Assets), Actual Amount	280,659	268,560
Common Equity Tier 1 Capital (to Risk-Weighted Assets), Actual Amount	249,753	233,560
Tier 1 Capital (to 4th Qtr. Average Assets), Actual Amount	$ 280,659	$ 268,560
Total Capital (to Risk-Weighted Assets), Ratio	12.72%	12.54%
Tier 1 Capital (to Risk-Weighted Assets), Ratio	11.70%	11.55%
Common Equity Tier 1 Capital (to Risk-Weighted Assets), Ratio	10.41%	10.04%
Tier 1 Capital (to 4th Qtr. Average Assets), Ratio	6.28%	6.79%
Total Capital (to Risk-Weighted Assets), Capital Adequacy Amount	$ 191,904	$ 186,021
Tier 1 Capital (to Risk-Weighted Assets), Capital Adequacy Amount	143,928	139,515
Common Equity Tier 1 Capital (to Risk-Weighted Assets), Capital Adequacy Amount	107,946	104,637
Tier 1 Capital (to 4th Qtr. Average Assets), Capital Adequacy Amount	$ 178,903	$ 158,114
Total Capital (to Risk-Weighted Assets), Capital Adequacy Ratio	8.00%	8.00%
Tier 1 Capital (to Risk-Weighted Assets), Capital Adequacy Ratio	6.00%	6.00%
Common Equity Tier 1 Capital (to Risk-Weighted Assets), Capital Adequacy Ratio	4.50%	4.50%
Tier 1 Capital (to 4th Qtr. Average Assets), Capital Adequacy Ratio	4.00%	4.00%
Total Capital (to Risk-Weighted Assets), Well Capitalized Amount	$ 239,880	$ 232,526
Tier 1 Capital (to Risk-Weighted Assets), Well Capitalized Amount	191,904	186,021
Common Equity Tier 1 Capital (to Risk-Weighted Assets), Well Capitalized Amount	155,922	151,142
Tier 1 Capital (to 4th Qtr. Average Assets), Well Capitalized Amount	$ 223,628	$ 197,642
Total Capital (to Risk-Weighted Assets), Well Capitalized Ratio	10.00%	10.00%
Tier 1 Capital (to Risk-Weighted Assets), Well Capitalized Ratio	8.00%	8.00%
Common Equity Tier 1 Capital (to Risk-Weighted Assets), Well Capitalized Ratio	6.50%	6.50%
Tier 1 Capital (to 4th Qtr. Average Assets), Well Capitalized Ratio	5.00%	5.00%

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Income Taxes - Summary of Current and Deferred Components of Income Tax (Benefit) Expense (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Current expense:
Federal									$ 3,875	$ 3,393	$ 3,981
State									439	399	498
Total current expense									4,314	3,792	4,479
Deferred (benefit) expense:
Federal									(4,450)	(3,098)	(3,179)
State									(334)	(161)	(434)
Valuation allowance									108
Total deferred benefit									(4,676)	(3,259)	(3,613)
Provision for income taxes	$ (394)	$ (52)	$ 20	$ 64	$ (95)	$ 180	$ 233	$ 215	$ (362)	$ 533	$ 866

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Income Taxes - Income Tax Accounts Included in Other Assets (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Currently receivable	$ 633	$ 1,217
Deferred income tax asset, net	43,129	40,157
Total	$ 43,762	$ 41,374

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Income Taxes - Summary of Differences between Income Tax (Benefit) Expense at the Statutory Federal Income Tax Rate and Total Income Tax Expense (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Federal income tax expense at statutory rates									$ 8,218	$ 8,008	$ 7,727
State income tax, net of federal income tax benefit									69	157	42
Insurance income									(406)	(375)	(353)
Effect of tax-exempt interest									(8,259)	(6,915)	(6,097)
Net tax credit									(395)	(460)	(517)
Valuation allowance									108
Other									303	118	64
Provision for income taxes	$ (394)	$ (52)	$ 20	$ 64	$ (95)	$ 180	$ 233	$ 215	$ (362)	$ 533	$ 866
Effective tax rate									(1.50%)	2.30%	3.80%

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Income Taxes - Gross Deferred Income Tax Assets and Gross Deferred Income Tax Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Deferred income tax assets:
Allowance for loan losses	$ 10,419	$ 9,852
AMT credit	10,234	7,041
Deferred compensation	9,684	8,495
Pension and SERP liability	7,658	8,714
Unrealized losses on securities transferred to held-to-maturity	3,161	4,667
Depreciation	968	673
Accrued bonus	612	508
Unrealized (gains) losses on securities available-for-sale	357	108
Charitable contributions carryforward	266
Acquisition premium	128	231
Nonaccrual interest	125	138
Limited partnerships	30	52
Investments write down	26	26
Other	220	173
Gross deferred income tax asset	43,888	40,678
Valuation allowance	(108)
Gross deferred income tax asset,net of valuation allowance	43,780	40,678
Deferred income tax liabilities:
Mortgage servicing rights	(651)	(521)
Gross deferred income tax liability	(651)	(521)
Deferred income tax asset net	$ 43,129	$ 40,157

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Income Taxes - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2016 USD ($)
Income Tax Disclosure [Abstract]
Valuation allowance on charitable contribution carryforward	$ 108,000
Charitable contribution carryforward period	4 years

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Employee Benefits - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items]
Benefits expected to be paid in 2017		$ 1,457,000
Benefits expected to be paid in 2018		1,481,000
Benefits expected to be paid in 2019		1,516,000
Benefits expected to be paid in 2020		1,671,000
Benefits expected to be paid in 2021		1,863,000
Aggregate benefits expected to paid		10,650,000
Discretionary bonus expense		1,418,000	$ 1,178,000	$ 1,434,000
Transfers in or out of level 3		$ 0	0
Voluntary contribution of employees		33.30%
Contributions matched by compensation contribution		6.00%
Voluntary contribution of employees, amount		$ 418,000	$ 403,000	$ 346,000
Change in Assumptions for Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Decrease in periodic plan cost		859,000
Supplemental Insurance/ Retirement Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Benefits expected to be paid in 2017		2,031,000
Benefits expected to be paid in 2018		1,990,000
Benefits expected to be paid in 2019		1,964,000
Benefits expected to be paid in 2020		1,906,000
Benefits expected to be paid in 2021		1,830,000
Aggregate benefits expected to paid		$ 11,972,000
Scenario, Forecast [Member]
Defined Benefit Plan Disclosure [Line Items]
Discretionary bonus expense	$ 1,000,000
Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Allocation mix for the common and collective trust portfolio, Minimum		40.00%
Allocation mix for the common and collective trust portfolio, Maximum		64.00%
Fixed Income Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Allocation mix for the common and collective trust portfolio, Minimum		15.00%
Allocation mix for the common and collective trust portfolio, Maximum		25.00%
Hedge Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Allocation mix for the common and collective trust portfolio, Minimum		20.00%
Allocation mix for the common and collective trust portfolio, Maximum		36.00%

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Employee Benefits - Fair Value of Plan Assets and Major Categories (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, Percentage	100.00%	100.00%
Total, fair value of plan assets	$ 37,447	$ 33,717
Fair Value Measurements, Level 1 Inputs [Member]
Defined Benefit Plan Disclosure [Line Items]
Total, fair value of plan assets	17,160	14,873
Fair Value Measurements, Level 2 Inputs [Member]
Defined Benefit Plan Disclosure [Line Items]
Total, fair value of plan assets	17,501	16,320
Fair Value Measurements, Level 3 Inputs [Member]
Defined Benefit Plan Disclosure [Line Items]
Total, fair value of plan assets	$ 2,786	$ 2,524	$ 2,360
Collective Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, Percentage	59.30%	61.20%
Total, fair value of plan assets	$ 22,209	$ 20,627
Collective Funds [Member] | Fair Value Measurements, Level 1 Inputs [Member]
Defined Benefit Plan Disclosure [Line Items]
Total, fair value of plan assets	4,708	4,307
Collective Funds [Member] | Fair Value Measurements, Level 2 Inputs [Member]
Defined Benefit Plan Disclosure [Line Items]
Total, fair value of plan assets	$ 17,501	$ 16,320
Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, Percentage	19.70%	17.70%
Total, fair value of plan assets	$ 7,363	$ 5,990
Equity Securities [Member] | Fair Value Measurements, Level 1 Inputs [Member]
Defined Benefit Plan Disclosure [Line Items]
Total, fair value of plan assets	$ 7,363	$ 5,990
Mutual Fund [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, Percentage	12.30%	11.90%
Total, fair value of plan assets	$ 4,615	$ 4,001
Mutual Fund [Member] | Fair Value Measurements, Level 1 Inputs [Member]
Defined Benefit Plan Disclosure [Line Items]
Total, fair value of plan assets	$ 4,615	$ 4,001
Hedge Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, Percentage	7.40%	7.50%
Total, fair value of plan assets	$ 2,786	$ 2,524
Hedge Funds [Member] | Fair Value Measurements, Level 3 Inputs [Member]
Defined Benefit Plan Disclosure [Line Items]
Total, fair value of plan assets	$ 2,786	$ 2,524
Short-Term Investments [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, Percentage	1.30%	1.70%
Total, fair value of plan assets	$ 474	$ 575
Short-Term Investments [Member] | Fair Value Measurements, Level 1 Inputs [Member]
Defined Benefit Plan Disclosure [Line Items]
Total, fair value of plan assets	$ 474	$ 575

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Employee Benefits - Changes in Level 3 Securities (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Defined Benefit Plan Disclosure [Line Items]
Balance at beginning of year	$ 33,717
Balance at end of year	37,447	$ 33,717
Fair Value Measurements, Level 3 Inputs [Member]
Defined Benefit Plan Disclosure [Line Items]
Balance at beginning of year	2,524	2,360
Purchases	114	224
Redemptions	(309)	(40)
Actual return - assets still being held	457	(20)
Balance at end of year	$ 2,786	$ 2,524

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Employee Benefits - Components of Net Periodic Benefit Cost (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Change in plan assets
Balance at beginning of year	$ 33,717
Balance at end of year	37,447	$ 33,717
Other changes in plan assets and benefit obligations recognized in other comprehensive income
Total recognized in other comprehensive income	16,733	17,406
Defined Benefit Pension Plan [Member]
Change projected in benefit obligation
Benefit obligation at beginning of year	38,597	40,011
Service cost	1,273	1,343
Interest cost	1,358	1,576
Actuarial (gain)/loss	2,593	(3,424)
Benefits paid	(1,566)	(909)
Projected benefit obligation at end of year	42,255	38,597
Change in plan assets
Balance at beginning of year	33,717	33,812
Actual return on plan assets	3,221	(1,186)
Employer contributions	2,075	2,000
Benefits paid	(1,566)	(909)
Balance at end of year	37,447	33,717
(Unfunded) Funded status	(4,808)	(4,880)
Accumulated benefit obligation	$ 42,255	$ 38,597
Weighted-average assumptions as of December 31
Discount rate - Liability	3.99%	4.18%
Discount rate - Expense	4.18%	4.00%
Expected return on plan assets	8.00%	8.00%
Rate of compensation increase	4.00%	4.00%
Components of net periodic benefit cost
Service cost	$ 1,273	$ 1,343
Interest cost	1,358	1,576
Expected return on plan assets	(2,776)	(2,749)
Recognized prior service cost	(104)	(104)
Recognized net losses	801	812
Net periodic cost (benefit)	552	878
Other changes in plan assets and benefit obligations recognized in other comprehensive income
Amortization of prior service cost	104	104
Net (gain) loss	1,347	(301)
Total recognized in other comprehensive income	1,451	(197)
Total recognized in net periodic benefit cost and other comprehensive income	2,003	681
Supplemental Insurance/ Retirement Plan [Member]
Change projected in benefit obligation
Benefit obligation at beginning of year	38,204	31,989
Service cost	1,820	1,589
Interest cost	1,334	1,365
Actuarial (gain)/loss	(1,653)	4,304
Benefits paid	(1,095)	(1,043)
Projected benefit obligation at end of year	38,610	38,204
Change in plan assets
Benefits paid	(1,095)	(1,043)
(Unfunded) Funded status	(38,610)	(38,204)
Accumulated benefit obligation	$ 36,392	$ 34,884
Weighted-average assumptions as of December 31
Discount rate - Liability	3.85%	4.03%
Discount rate - Expense	4.01%	4.00%
Rate of compensation increase	4.00%	4.00%
Components of net periodic benefit cost
Service cost	$ 1,820	$ 1,589
Interest cost	1,334	1,365
Recognized prior service cost	114	114
Recognized net losses	805	599
Net periodic cost (benefit)	4,073	3,667
Other changes in plan assets and benefit obligations recognized in other comprehensive income
Amortization of prior service cost	(114)	(114)
Net (gain) loss	(2,458)	3,705
Total recognized in other comprehensive income	(2,572)	3,591
Total recognized in net periodic benefit cost and other comprehensive income	$ 1,501	$ 7,258

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Employee Benefits - Summary of Defined Pension Plan and Supplemental Insurance Retirement Plan (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Net Periodic Benefit Cost [Member]
Defined Benefit Plan Disclosure [Line Items]
Prior service cost	$ (445)	$ (455)
Net actuarial loss	(27,415)	(28,526)
Total	(27,860)	(28,981)
Defined Benefit Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Prior service cost	(104)	(104)
Net actuarial loss	2,593	(3,424)
Total	(42,255)	(38,597)	$ (40,011)
Defined Benefit Pension Plan [Member] | Net Periodic Benefit Cost [Member]
Defined Benefit Plan Disclosure [Line Items]
Prior service cost	204	308
Net actuarial loss	(13,999)	(12,652)
Total	(13,795)	(12,344)
Supplemental Insurance/ Retirement Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Prior service cost	114	114
Net actuarial loss	(1,653)	4,304
Total	(38,610)	(38,204)	$ (31,989)
Supplemental Insurance/ Retirement Plan [Member] | Net Periodic Benefit Cost [Member]
Defined Benefit Plan Disclosure [Line Items]
Prior service cost	(649)	(763)
Net actuarial loss	(13,416)	(15,874)
Total	$ (14,065)	$ (16,637)

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Employee Benefits - Summary of Accumulated Other Comprehensive Loss Expected to be Recognized (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items]
Amortization of loss to be recognized in 2017	$ 297	$ 2,890	$ 8,544
Defined Benefit Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Amortization of prior service cost to be recognized in 2017	(104)
Amortization of loss to be recognized in 2017	903
Supplemental Insurance/ Retirement Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Amortization of prior service cost to be recognized in 2017	114
Amortization of loss to be recognized in 2017	$ 636

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Financial Instruments with Off-Balance-Sheet Risk - Summary of Financial Instruments with Off-Balance-Sheet Risk (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Financial instruments whose contract amount represents credit risk:
Financial instruments with off-balance-sheet risk	$ 6,796	$ 4,936
Commitments to Originate 1-4 Family Mortgages [Member]
Financial instruments whose contract amount represents credit risk:
Financial instruments with off-balance-sheet risk	13,877	5,638
Unused Lines of Credit [Member]
Financial instruments whose contract amount represents credit risk:
Financial instruments with off-balance-sheet risk	362,357	320,874
Unadvanced Portions of Construction Loans [Member]
Financial instruments whose contract amount represents credit risk:
Financial instruments with off-balance-sheet risk	22,049	11,589
Unadvanced Portions of Other Loans [Member]
Financial instruments whose contract amount represents credit risk:
Financial instruments with off-balance-sheet risk	$ 52,224	$ 41,717

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Other Operating Expenses - Summary of Other Operating Expenses (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Other Income and Expenses [Abstract]
Marketing	$ 2,185	$ 1,849	$ 1,793
Software maintenance/amortization	1,863	1,670	1,524
Legal and audit	1,255	1,269	1,072
Contributions	789	690	735
Processing services	1,040	1,002	944
Consulting	1,168	1,050	964
Postage and delivery	987	905	964
Supplies	948	965	870
Telephone	1,032	804	753
Directors' fees	413	377	389
Insurance	323	301	304
Other	1,812	1,826	1,520
Total	$ 13,815	$ 12,708	$ 11,832

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Fair Values of Financial Instruments - Carrying Amount and Fair Value of Company's Financial Instruments (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Financial assets:
Securities held-to-maturity	$ 1,653,986	$ 1,438,903
Loans	1,899,527	1,708,461
Financial liabilities:
Time deposits	478,359	473,426
Other borrowed funds	293,000	368,000
Subordinated debentures	36,083	36,083
Carrying Value [Member]
Financial assets:
Securities held-to-maturity	1,653,986	1,438,903
Loans	1,899,527	1,708,461
Financial liabilities:
Time deposits	478,359	473,426
Other borrowed funds	293,000	368,000
Subordinated debentures	36,083	36,083
Estimated Fair Value [Member]
Financial assets:
Securities held-to-maturity	1,635,808	1,438,960
Loans	1,873,703	1,677,270
Financial liabilities:
Time deposits	480,133	474,046
Other borrowed funds	294,940	372,209
Subordinated debentures	36,083	36,083
Fair Value Measurements, Level 2 Inputs [Member]
Financial assets:
Securities held-to-maturity	1,635,808	1,438,960
Financial liabilities:
Time deposits	480,133	474,046
Other borrowed funds	294,940	372,209
Fair Value Measurements, Level 3 Inputs [Member]
Financial assets:
Loans	1,873,703	1,677,270
Financial liabilities:
Subordinated debentures	$ 36,083	$ 36,083

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Quarterly Results of Operations - Quarterly Results of Operations (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Quarterly Financial Information [Line Items]
Interest income	$ 24,689	$ 25,005	$ 23,742	$ 23,263	$ 22,496	$ 23,750	$ 22,675	$ 21,172	$ 96,699	$ 90,093	$ 85,371
Interest expense	5,927	5,791	5,486	5,413	5,274	5,134	4,961	4,765	22,617	20,134	19,136
Net interest income	18,762	19,214	18,256	17,850	17,222	18,616	17,714	16,407	74,082	69,959	66,235
Provision for loan losses	200	375	350	450				200	1,375	200	2,050
Net interest income after provision for loan losses	18,562	18,839	17,906	17,400	17,222	18,616	17,714	16,207	72,707	69,759	64,185
Other operating income	3,700	4,225	4,643	3,654	4,448	3,830	4,210	3,505	16,222	15,993	15,271
Operating expenses	16,156	16,630	16,288	15,683	15,794	16,100	15,766	14,538	64,757	62,198	56,730
Income before income taxes	6,106	6,434	6,261	5,371	5,876	6,346	6,158	5,174	24,172	23,554	22,726
Provision for income taxes	(394)	(52)	20	64	(95)	180	233	215	(362)	533	866
Net income	$ 6,500	$ 6,486	$ 6,241	$ 5,307	$ 5,971	$ 6,166	$ 5,925	$ 4,959	24,534	23,021	21,860
Class A Common Stock [Member]
Quarterly Financial Information [Line Items]
Net income									$ 19,270	$ 18,081	$ 17,157
Share data:
Average shares outstanding, basic	3,600,729	3,600,729	3,600,729	3,600,729	3,600,729	3,600,729	3,600,729	3,600,729	3,600,729	3,600,729	3,591,732
Average shares outstanding, diluted	5,567,909	5,567,909	5,567,909	5,567,909	5,567,909	5,567,909	5,567,909	5,567,909	5,567,909	5,567,909	5,562,209
Earnings per share, basic	$ 1.42	$ 1.41	$ 1.36	$ 1.16	$ 1.30	$ 1.35	$ 1.29	$ 1.08	$ 5.35	$ 5.02	$ 4.78
Earnings per share, diluted	$ 1.17	$ 1.16	$ 1.12	$ 0.95	$ 1.07	$ 1.11	$ 1.06	$ 0.89	$ 4.41	$ 4.13	$ 3.93
Class B Common Stock [Member]
Quarterly Financial Information [Line Items]
Net income									$ 5,264	$ 4,940	$ 4,703
Share data:
Average shares outstanding, basic	1,967,180	1,967,180	1,967,180	1,967,180	1,967,180	1,967,180	1,967,180	1,967,180	1,967,180	1,967,180	1,969,030
Average shares outstanding, diluted	1,967,180	1,967,180	1,967,180	1,967,180	1,976,180	1,967,180	1,967,180	1,967,180	1,967,180	1,967,180	1,969,030
Earnings per share, basic	$ 0.71	$ 0.71	$ 0.68	$ 0.58	$ 0.65	$ 0.67	$ 0.65	$ 0.54	$ 2.68	$ 2.51	$ 2.39
Earnings per share, diluted	$ 0.71	$ 0.71	$ 0.68	$ 0.58	$ 0.65	$ 0.67	$ 0.65	$ 0.54	$ 2.68	$ 2.51	$ 2.39

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Parent Company Financial Statements - Balance Sheets of Parent Company (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
ASSETS
Cash	$ 62,400	$ 52,877
Other assets	116,360	110,582
Total assets	4,462,608	3,947,441
LIABILITIES AND STOCKHOLDERS' EQUITY:
Liabilities	4,222,567	3,732,897
Subordinated debentures	36,083	36,083
Stockholders' equity	240,041	214,544	$ 192,500	$ 176,472
Total liabilities and stockholders' equity	4,462,608	3,947,441
Century Bancorp, Inc. [Member]
ASSETS
Cash	2,768	5,230
Investment in subsidiary, at equity	263,070	236,629
Other assets	10,335	8,808
Total assets	276,173	250,667
LIABILITIES AND STOCKHOLDERS' EQUITY:
Liabilities	49	40
Subordinated debentures	36,083	36,083
Stockholders' equity	240,041	214,544
Total liabilities and stockholders' equity	$ 276,173	$ 250,667

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Parent Company Financial Statements - Statements of Income of Parent Company (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income:
Other income									$ 3,441	$ 3,042	$ 2,600
Total interest income	$ 24,689	$ 25,005	$ 23,742	$ 23,263	$ 22,496	$ 23,750	$ 22,675	$ 21,172	96,699	90,093	85,371
Interest expense	5,927	5,791	5,486	5,413	5,274	5,134	4,961	4,765	22,617	20,134	19,136
Operating expenses	16,156	16,630	16,288	15,683	15,794	16,100	15,766	14,538	64,757	62,198	56,730
Income before income taxes	6,106	6,434	6,261	5,371	5,876	6,346	6,158	5,174	24,172	23,554	22,726
Benefit from income taxes	(394)	(52)	20	64	(95)	180	233	215	(362)	533	866
Net income	$ 6,500	$ 6,486	$ 6,241	$ 5,307	$ 5,971	$ 6,166	$ 5,925	$ 4,959	24,534	23,021	21,860
Century Bancorp, Inc. [Member]
Income:
Dividends from subsidiary									2,000	1,500
Interest income from deposits in bank									3	13	21
Other income									28	24	72
Total interest income									2,031	1,537	93
Interest expense									937	792	2,329
Operating expenses									220	212	204
Income before income taxes									874	533	(2,440)
Benefit from income taxes									(383)	(328)	(830)
Income before equity in undistributed income of subsidiary									1,257	861	(1,610)
Equity in undistributed income of subsidiary									23,277	22,160	23,470
Net income									$ 24,534	$ 23,021	$ 21,860

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Parent Company Financial Statements - Statements of Cash Flows of Parent Company (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 6,500	$ 6,486	$ 6,241	$ 5,307	$ 5,971	$ 6,166	$ 5,925	$ 4,959	$ 24,534	$ 23,021	$ 21,860
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation and amortization									3,561	3,296	2,937
Increase in other assets									(2,953)	(10,862)	(2,849)
Net cash provided by (used in) operating activities									22,006	11,053	22,387
CASH FLOWS FROM FINANCING ACTIVITIES:
Net proceeds from the exercise of stock options											361
Cash dividends paid									(2,201)	(2,200)	(2,196)
Net cash provided by (used in) financing activities									485,387	293,259	158,193
Net increase (decrease) in cash and cash equivalents									15,427	(84,633)	210,679
Century Bancorp, Inc. [Member]
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income									24,534	23,021	21,860
Adjustments to reconcile net income to net cash provided by operating activities
Undistributed income of subsidiary									(23,277)	(22,160)	(23,470)
Depreciation and amortization										3	12
Increase in other assets									(1,527)	(1,112)	(1,067)
Decrease in liabilities									9	4	(71)
Net cash provided by (used in) operating activities									(261)	(244)	(2,736)
CASH FLOWS FROM FINANCING ACTIVITIES:
Net proceeds from the exercise of stock options											361
Cash dividends paid									(2,201)	(2,200)	(2,196)
Net cash provided by (used in) financing activities									(2,201)	(2,200)	(1,835)
Net increase (decrease) in cash and cash equivalents									(2,462)	(2,444)	(4,571)
Cash and cash equivalents at beginning of year				$ 5,230				$ 7,674	5,230	7,674	12,245
Cash and cash equivalents at end of year	$ 2,768				$ 5,230				$ 2,768	$ 5,230	$ 7,674