Camden National (CAC) 10-K 7 Mar 17 2016 FY Annual report Financial data

Document and Entity Information

Document and Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2016	Mar. 01, 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	2,016
Document Fiscal Period Focus	FY
Trading Symbol	CAC
Entity Registrant Name	CAMDEN NATIONAL CORP
Entity Central Index Key	750,686
Current Fiscal Year End Date	--12-31
Entity Filer Category	Accelerated Filer
Entity Common Stock, Shares Outstanding		15,493,927
Entity Public Float			$ 316,376,401
Entity Well-known Seasoned Issuer	No
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No

Consolidated Statements Of Cond

Consolidated Statements Of Condition - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
ASSETS
Cash and due from banks	$ 87,707	$ 79,488
Securities
Available-for-sale, at fair value	779,867	750,338
Held to maturity, at amortized cost	94,609	84,144
Federal Home Loan Bank and Federal Reserve Bank stock, at cost	23,203	21,513
Total securities	897,679	855,995
Loans held for sale, at fair value	14,836	10,958
Loans	2,594,564	2,490,206
Less: allowance for loan losses	(23,116)	(21,166)
Net loans	2,571,448	2,469,040
Goodwill	94,697	95,657
Other Intangible Assets	6,764	8,667
Bank-owned life insurance	78,119	59,917
Premises and equipment, net	42,873	45,959
Deferred tax assets	39,263	39,716
Interest receivable	8,654	7,985
Other real estate owned	922	1,304
Other assets	21,268	34,658
Total assets	3,864,230	3,709,344
Deposits
Demand	406,934	357,673
Interest checking	701,494	740,084
Savings and money market	979,263	912,668
Retail certificates of deposit	468,203	516,867
Brokered deposits	272,635	199,087
Total deposits	2,828,529	2,726,379
Short-term borrowings	530,129	477,852
Long-term borrowings	10,791	35,911
Subordinated Debt	58,755	58,599
Accrued interest and other liabilities	44,479	47,413
Total liabilities	3,472,683	3,346,154
Commitments and Contingencies
Shareholders' Equity
Common stock, no par value: authorized 20,000,000 shares, issued and outstanding 15,476,379 and 15,330,717 on December 31, 2016 and 2015, respectively	156,041	153,083
Retained earnings	249,415	222,329
Accumulated other comprehensive income (loss)
Net unrealized losses on available-for-sale securities, net of tax	(6,085)	(3,801)
Net unrealized losses on cash flow hedging derivative instruments, net of tax	(5,694)	(6,374)
Net unrecognized losses on postretirement plans, net of tax	(2,130)	(2,047)
Total accumulated other comprehensive loss	(13,909)	(12,222)
Total shareholders’ equity	391,547	363,190
Total liabilities and shareholders’ equity	$ 3,864,230	$ 3,709,344

Consolidated Statements Of Con3

Consolidated Statements Of Condition (Parenthetical) - $ / shares	Dec. 31, 2016	Dec. 31, 2015
Statement of Financial Position [Abstract]
Common Stock, no par value (dollars per share)	$ 0	$ 0
Common stock, authorized	20,000,000	20,000,000
Common stock, issued	15,476,379	15,330,717
Common stock, outstanding	15,476,379	15,330,717

Consolidated Statements Of Inco

Consolidated Statements Of Income - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Interest Income
Interest and fees on loans		$ 109,224	$ 81,221	$ 70,654
Interest on U.S. government and sponsored enterprise obligations		16,082	15,091	16,118
Interest on state and political subdivision obligations		2,836	2,208	1,256
Interest on federal funds sold and other investments		1,484	624	357
Total interest income		129,626	99,144	88,385
Interest Expense
Interest on deposits		8,633	6,511	6,267
Interest on borrowings		4,506	3,457	3,329
Interest on subordinated debentures		3,415	2,724	2,532
Total interest expense		16,554	12,692	12,128
Net interest income		113,072	86,452	76,257
Provision for credit losses		5,258	1,936	2,220
Net interest income after provision for credit losses		107,814	84,516	74,037
Non-Interest Income
Debit card income		7,578	5,277	4,675
Service charges on deposit accounts		7,210	6,423	6,229
Mortgage banking income, net		6,258	2,031	282
Income from fiduciary services		4,960	4,918	4,989
Bank-owned life insurance		2,594	1,680	1,437
Brokerage and insurance commissions		2,074	1,699	1,766
Other service charges and fees		1,962	1,573	1,461
Net gain on sale of securities		51	4	451
Other income		6,934	3,877	3,080
Total non-interest income		39,621	27,482	24,370
Non-Interest Expenses
Salaries and employee benefits		48,072	37,220	32,669
Furniture, equipment and data processing		9,557	8,057	7,316
Net occupancy costs		7,088	5,695	5,055
Consulting and professional fees		3,234	2,625	2,368
Other real estate owned and collection costs		3,128	2,491	2,289
Regulatory assessments		2,777	2,184	1,982
Debit card expense		2,584	1,936	1,725
Amortization of intangible assets		1,903	1,306	1,148
Merger and acquisition costs		866	10,415	0
Other expenses		10,687	9,210	7,845
Total non-interest expense		89,896	81,139	62,397
Income before income tax expense		57,539	30,859	36,010
Income Tax Expense		17,472	9,907	11,440
Net income		$ 40,067	$ 20,952	$ 24,570
Per Share Data
Basic earnings per share	[1]	$ 2.59	$ 1.73	$ 2.19
Diluted earnings per share	[1]	$ 2.57	$ 1.73	$ 2.19
Weighted average number of common shares outstanding	[1]	15,422,160	12,031,294	11,176,468
Diluted weighted average number of common shares outstanding	[1]	15,504,239	12,074,579	11,205,888
[1]	(2)Share and per share amounts have been adjusted to reflect the three-for-two split effective September 30, 2016, for all periods presented. Refer to Note 13.

Consolidated Statements Of Comp

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		$ 40,067	$ 20,952	$ 24,570
Net change in unrealized gains (losses) on available-for-sale securities:
Net change in unrealized gains (losses) on available-for-sale securities, net of tax of $1,212, $1,873, and ($4,275), respectively		(2,251)	(3,479)	7,938
Net reclassification adjustment for gains included in net income, net of tax of $18, $1, and $158, respectively	[1]	(33)	(3)	(293)
Net change in unrealized gains (losses) on available-for-sale securities, net of tax		(2,284)	(3,482)	7,645
Net change in unrealized gains (losses) on cash flow hedging derivatives:
Net change in unrealized gains (losses) on cash flow hedging derivatives, net of tax of $343, $825, and $2,431, respectively		(637)	(1,533)	(4,515)
Net reclassification adjustment for effective portion of cash flow hedges included in interest expense, net of tax of ($709), ($593), and ($600), respectively	[2]	1,317	1,102	1,114
Net change in unrealized gains (losses) on cash flow hedging derivatives, net of tax		680	(431)	(3,401)
Postretirement plans:
Net actuarial loss, net of tax of $127, $21, and $225, respectively		(235)	(39)	(418)
Reclassification of amortization of net unrecognized actuarial loss and of prior service cost included in net periodic cost, net of tax of ($83), ($84), and ($51), respectively	[3]	152	155	96
Net gain (loss) on postretirement plans, net of tax		(83)	116	(322)
Other comprehensive income (loss)		(1,687)	(3,797)	3,922
Comprehensive income		$ 38,380	$ 17,155	$ 28,492
[1]	(1) Reclassified into the consolidated statements of income within net gain on sale of securities.
[2]	(2)Reclassified into the consolidated statements of income within interest on subordinated debentures.
[3]	(3) Reclassified into the consolidated statements of income within salaries and employee benefits.

Consolidated Statements Of Com6

Consolidated Statements Of Comprehensive Income (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Statement of Comprehensive Income [Abstract]
Net change in unrealized gain (loss) on available-for-sale securities, tax effect	$ 1,212	$ 1,873	$ (4,275)
Net reclassification adjustmetn for gains included in net income, tax effect	18	1	158
Net change in unrealized gains (losses) on cash flow hedging derivatives, tax effect	343	825	2,431
Net reclassification adjustments for effective portion of cash flow hedges included in interest expense, tax effect	(709)	(593)	(600)
Net actuarial (loss) gain, tax effect	127	21	225
Reclassification of amortization of net unrecognized actuarial loss and of prior service cost included in net periodic cost, tax effect	$ (83)	$ (84)	$ (51)

Consolidated Statements Of Chan

Consolidated Statements Of Changes In Shareholders' Equity - USD ($)		Total	Common Stock	Retained Earnings	Accumulated Other Comprehensive Income (Loss)
Beginning Balance (in shares) at Dec. 31, 2013			11,369,870
Beginning Balance at Dec. 31, 2013		$ 231,096,000	$ 47,783,000	$ 195,660,000	$ (12,347,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		24,570,000		24,570,000
Other comprehensive income, net of tax		3,922,000			3,922,000
Stock-based compensation expense		599,000	$ 599,000
Exercise of stock options and issuance of restricted stock, net of repurchase for tax withholdings and tax benefit (in shares)			41,496
Exercise of stock options and issuance of vested share awards, net of repurchase for tax withholdings and tax benefit		328,000	$ 328,000
Common stock repurchased (in shares)			(272,033)
Common stock repurchased		(7,155,000)	$ (7,155,000)
Cash dividends declared ( $0.74, $0.80 and $0.83 per share in 2016, 2015, and 2014, respectively)	[1]	(8,251,000)		(8,251,000)
Equity issuance costs		0
SBM acquisition common stock issuance (in shares)			4,124,643
Ending Balance (in shares) at Dec. 31, 2014			11,139,333
Ending Balance at Dec. 31, 2014		245,109,000	$ 41,555,000	211,979,000	(8,425,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		20,952,000		20,952,000
Other comprehensive income, net of tax		(3,797,000)			(3,797,000)
Stock-based compensation expense		836,000	$ 836,000
Exercise of stock options and issuance of restricted stock, net of repurchase for tax withholdings and tax benefit (in shares)			66,741
Exercise of stock options and issuance of vested share awards, net of repurchase for tax withholdings and tax benefit		753,000	$ 753,000
Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs		(612,000)	(612,000)
Cash dividends declared ( $0.74, $0.80 and $0.83 per share in 2016, 2015, and 2014, respectively)	[1]	(10,602,000)		(10,602,000)
Equity issuance costs		(612,000)
SBM acquisition common stock issuance		108,561,000	108,561,000
SBM acquisition non-qualified stock option awards		1,990,000	$ 1,990,000
Ending Balance (in shares) at Dec. 31, 2015			15,330,717
Ending Balance at Dec. 31, 2015		363,190,000	$ 153,083,000	222,329,000	(12,222,000)
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Net Income			$ 72,000	(72,000)
Stock Issued During Period, Shares, Stock Splits			(173)
Stockholders' Equity Note, Stock Split, Reduction of Capital		(5,000)	$ (5,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		40,067,000		40,067,000
Other comprehensive income, net of tax		(1,687,000)			(1,687,000)
Stock-based compensation expense		1,997,000	$ 1,997,000
Exercise of stock options and issuance of restricted stock, net of repurchase for tax withholdings and tax benefit (in shares)			145,835
Exercise of stock options and issuance of vested share awards, net of repurchase for tax withholdings and tax benefit		894,000	$ 894,000
Cash dividends declared ( $0.74, $0.80 and $0.83 per share in 2016, 2015, and 2014, respectively)	[1]	(12,909,000)		(12,909,000)
Equity issuance costs		0
SBM acquisition common stock issuance (in shares)			4,100,000
Ending Balance (in shares) at Dec. 31, 2016			15,476,379
Ending Balance at Dec. 31, 2016		$ 391,547,000	$ 156,041,000	$ 249,415,000	$ (13,909,000)
[1]	(1) Share and per share amounts have been adjusted to reflect the three-for-two stock split effective September 30, 2016, for all periods presented. Refer to Note 13 for further discussion.

Consolidated Statements Of Cha8

Consolidated Statements Of Changes In Shareholders' Equity (Parenthetical) - $ / shares	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Statement of Stockholders' Equity [Abstract]
Cash dividends declared, per share	$ 0.83	$ 0.80	$ 0.74

Consolidated Statements Of Cash

Consolidated Statements Of Cash Flows	12 Months Ended
	Dec. 31, 2016USD ($)	Dec. 31, 2015USD ($)	Dec. 31, 2014USD ($)
Operating Activities
Net income	$ 40,067,000	$ 20,952,000	$ 24,570,000
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for credit losses	5,258,000	1,936,000	2,220,000
Depreciation and amortization expense	4,426,000	3,614,000	3,051,000
Purchase accounting accretion, net	(5,048,000)	(367,000)	(554,000)
Investment securities amortization and accretion, net	3,135,000	2,244,000	1,784,000
Stock-based compensation expense	1,997,000	836,000	599,000
Amortization of intangible assets	1,903,000	1,306,000	1,148,000
Net gains on sale of securities	(51,000)	(4,000)	(451,000)
Net increase in other real estate owned valuation allowance and (gain) loss on disposition	35,000	362,000	215,000
Originations of mortgage loans held for sale	(236,450,000)	(72,032,000)	(799,000)
Proceeds from the sale of mortgage loans	238,351,000	62,485,000	830,000
Gain on sale of mortgage loans, net of origination costs	(6,201,000)	(1,278,000)	(31,000)
Cost of fixed assets disposals associated with the SBM acquisition	0	1,130,000	0
Goodwill impairment	0	0	0
(Increase) decrease in other assets	11,329,000	(7,062,000)	(3,349,000)
Increase (decrease) in other liabilities	(1,333,000)	1,796,000	653,000
Net cash provided by operating activities	57,418,000	15,918,000	29,886,000
Investing Activities
Cash received in SBM acquisition, net of cash paid	0	59,917,000	0
Proceeds from sales and maturities of available-for-sale securities	184,564,000	156,434,000	134,358,000
Purchase of available-for-sale securities	(220,169,000)	(111,170,000)	(78,355,000)
Purchase of securities held-to-maturity	(10,986,000)	(64,355,000)	(20,338,000)
Net increase in loans	(103,699,000)	(94,811,000)	(196,670,000)
Proceeds from sale of premises and equipment	90,000	0	0
Purchase of premises and equipment	(1,671,000)	(3,189,000)	(1,316,000)
Purchase of Federal Home Loan Bank and Federal Reserve Bank stock	(7,342,000)	(1,594,000)	(718,000)
Proceeds from sale of other real estate owned	5,652,000	471,000	51,000
Proceeds from sale of other real estate owned	730,000	2,825,000	1,730,000
Recoveries of previously charged-off loans	486,000	728,000	746,000
Purchase of bank-owned life insurance, net of death benefit proceeds	(15,608,000)	0	(10,000,000)
Net cash used in investing activities	(167,953,000)	(54,744,000)	(170,512,000)
Financing Activities
Net increase in deposits	103,027,000	71,825,000	118,435,000
Net increase (decrease) in other borrowed funds	77,227,000	(18,105,000)	46,954,000
Repayments on Federal Home Loan Bank long-term advances	(25,000,000)	(11,039,000)	(60,073,000)
Proceeds from Federal Home Loan Bank long-term advances	0	10,000,000	60,000,000
Repayments of Other Debt	(25,000,000)	0	0
Issuance of subordinated debt, net of costs	0	14,464,000	0
Common stock repurchases	0	0	(7,475,000)
Equity issuance costs	0	(612,000)	0
Exercise of stock options and issuance of restricted stock, net of repurchase for tax withholdings and tax benefit	(894,000)	(753,000)	(328,000)
Cash dividends paid on common stock and cash in lieu for fractional shares paid due to stock split	(12,394,000)	(9,785,000)	(8,085,000)
Net cash provided by financing activities	118,754,000	57,501,000	150,084,000
Net increase in cash and cash equivalents	8,219,000	18,675,000	9,458,000
Cash and cash equivalents at beginning of year	79,488,000	60,813,000	51,355,000
Cash and cash equivalents at end of year	87,707,000	79,488,000	60,813,000
Supplemental information
Interest paid	16,661,000	12,588,000	12,158,000
Income taxes paid	10,647,000	12,205,000	13,365,000
Transfer of loans and premises to other real estate owned	383,000	2,175,000	1,337,000
Measurement-period adjustments	960,000	0	0
Assets acquired in SBM acquisition, excluding net cash received (not adjusted for measurement-period adjustments)	0	729,283,000	0
Liabilities assumed in SBM acquisition (not adjusted for measurement-period adjustments)	0	729,500,000	0
Common stock and stock options issued for SBM acquisition	$ 0	$ 110,551,000	$ 0

Business and Summary of Signifi

Business and Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2016
Accounting Policies [Abstract]
Business and Summary of Significant Accounting Policies	Business and Summary of Significant Accounting Policies Acronyms and Abbreviations. The acronyms and abbreviations identified below are used in the notes to the consolidated financial statements. The following is provided to aid the reader and provide a reference page when reviewing these notes to the consolidated financial statements. Acadia Trust: Acadia Trust, N.A. was a wholly-owned subsidiary of Camden National Corporation until its merger with Camden National Bank, a wholly-owned subsidiary of Camden National Corporation, on November 30, 2016. IRS: Internal Revenue Service AFS: Available-for-sale LIBOR: London Interbank Offered Rate ALCO: Asset/Liability Committee LTIP: Long-Term Performance Share Plan ALL: Allowance for loan losses Management ALCO: Management Asset/Liability Committee AOCI: Accumulated other comprehensive income (loss) MBS: Mortgage-backed security ASC: Accounting Standards Codification Merger: On October 16, 2015, the two-step merger of Camden National Corporation, SBM Financial, Inc. and Atlantic Acquisitions, LLC, a wholly-owned subsidiary of Camden National Corporation, was completed ASU: Accounting Standards Update Merger Agreement: Plan of Merger, dated as of March 29, 2015, by and among Camden National Corporation, SBM Financial, Inc. and Atlantic Acquisitions, LLC, a wholly-owned subsidiary of Camden National Corporation Bank: Camden National Bank, a wholly-owned subsidiary of Camden National Corporation MSHA: Maine State Housing Authority BOLI: Bank-owned life insurance MSRs: Mortgage servicing rights Board ALCO: Board of Directors' Asset/Liability Committee MSPP: Management Stock Purchase Plan BSA: Bank Secrecy Act OTTI: Other-than-temporary impairment CCTA: Camden Capital Trust A, an unconsolidated entity formed by Camden National Corporation NIM: Net interest margin on a fully-taxable basis CDARS: Certificate of Deposit Account Registry System N.M.: Not meaningful CDs: Certificate of deposits Non-Agency: Non-agency private issue collateralized mortgage obligation Company: Camden National Corporation NRV: Net realizable value CMO: Collateralized mortgage obligation OCC: Office of the Comptroller of the Currency DCRP: Defined Contribution Retirement Plan OCI: Other comprehensive income (loss) EPS: Earnings per share OFAC: Office of Foreign Assets Control FASB: Financial Accounting Standards Board OREO: Other real estate owned FDIC: Federal Deposit Insurance Corporation SBM: SBM Financial, Inc., the parent company of The Bank of Maine FHLB: Federal Home Loan Bank SERP: Supplemental executive retirement plans FHLBB: Federal Home Loan Bank of Boston TDR: Troubled-debt restructured loan FRB: Federal Reserve System Board of Governors UBCT: Union Bankshares Capital Trust I, an unconsolidated entity formed by Union Bankshares Company that was subsequently acquired by Camden National Corporation FRBB: Federal Reserve Bank of Boston U.S.: United States of America GAAP: Generally accepted accounting principles in the United States 2003 Plan: 2003 Stock Option and Incentive Plan HPFC: Healthcare Professional Funding Corporation, a wholly-owned subsidiary of Camden National Bank 2012 Plan: 2012 Equity and Incentive Plan HTM: Held-to-maturity 2013 Repurchase Program: 2013 Common Stock Repurchase Program, approved by the Company's Board of Directors General Business. Camden National Corporation, a Maine corporation, is the bank holding company for Camden National Bank. The Bank serves individuals, businesses, municipalities and non-profits through a network of 61 banking offices and 84 ATMs across Maine, and two lending offices in New Hampshire and Massachusetts. Effective the close of business, November 30, 2016, Acadia Trust merged into the Bank. Upon completion of the Acadia Trust merger into the Bank, Camden National Wealth Management was created to operate as a division of the Bank and provide trust and investment management services to its clients, who are primarily located in Maine. The Company's primary source of income is from providing loans to individuals and small- to mid-sized companies through its market area. The Bank's deposits are insured by the FDIC, subject to regulatory limits. Principles of Consolidation . The accompanying consolidated financial statements include the accounts of the Company and the Bank (which includes the consolidated accounts of HPFC, Property A, Inc. and Property P, Inc.). All intercompany accounts and transactions have been eliminated in consolidation. Assets held by the Bank in a fiduciary capacity, through Camden National Wealth Management, are not assets of the Company and, therefore, are not included in the consolidated statements of condition. The Company also owns 100% of the common stock of CCTA and UBCT. These entities are unconsolidated subsidiaries of the Company. Reclassifications . Certain reclassifications have been made to prior year amounts to conform to the current year's presentation. Use of Estimates . The preparation of the financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting periods. Actual results could vary from these estimates. Several estimates are particularly critical and are susceptible to significant near-term change, including the ALL, the accounting for business combinations including subsequent impairment analyses for goodwill and other intangible assets, accounting for income taxes, postretirement benefits and asset impairment judgments, including OTTI of investment securities. Subsequent Events . The Company has evaluated events and transactions subsequent to December 31, 2016 for potential recognition or disclosure as required by GAAP. Significant Concentration of Credit Risk. The Bank grants loans primarily to customers in Maine. Although the Bank has a diversified loan portfolio, a large portion of the Bank's loans are secured by commercial or residential real estate located in Maine and is subject to volatility within Maine's real estate market. Furthermore, the debtors' ability to honor their contracts is highly dependent upon other economic factors throughout Maine. The Bank does not generally engage in non-recourse lending and typically will require the principals of any commercial borrower to obligate themselves personally on the loan. Cash and Cash Equivalents . For the purposes of reporting cash flows, cash and cash equivalents consist of cash on hand and amounts due from banks. The Bank is required by the FRB to maintain cash reserves equal to a percentage of deposits. The Company maintains the reserve balances in cash on hand or at the FRB. At December 31, 2016 and 2015, the Company had $50.3 million and $42.9 million , respectively, of cash on hand and in non-interest bearing accounts with other banks. At December 31, 2016 and 2015, the Company had $37.4 million and $36.6 million , respectively, of cash held in interest-bearing accounts with other banks. Investment Securities. Investment securities are classified at the time of purchase as AFS, HTM, or trading. The classification of investment securities are constantly re-evaluated for consistency with corporate goals and objectives. Trading securities are carried at fair value on the consolidated statements of condition with subsequent changes to fair value recorded in earnings. At December 31, 2016 and 2015, the Company did no t have any investment securities classified as trading securities on its consolidated statements of condition. Debt securities for which the Company has the positive intent and ability to hold to maturity are classified as HTM and recorded at amortized cost on the consolidated statements of condition. At December 31, 2016 and 2015, the Company had investment securities of $94.6 million and $84.1 million , respectively, classified as HTM and carried at amortized cost on its consolidated statements of condition. Investment securities that are not classified as HTM or trading securities are classified as AFS and are carried at fair value on the Company's consolidated statements of condition with subsequent changes to fair value recorded within AOCI, net of tax. At December 31, 2016 and 2015, the Company had investment securities of $779.9 million and $750.3 million , respectively, classified as AFS and carried at fair value on its consolidated statements of condition. Purchase premiums and discounts are recognized in interest income on the consolidated statements of income using the interest method over the period to maturity (or issuer call option date, if earlier) and are recorded on the trade date. Gains and losses on the sale of investment securities are recognized within non-interest income on the consolidated statements of income and are recorded on the trade date using the specific identification method. Management conducts a quarterly review and evaluation of its debt and equity securities portfolio to determine if the decline in fair value of any security appears to be other-than-temporary. The factors considered by management in its review include, but are not limited to: the length of time and the extent to which the fair value has been less than cost, the financial condition and near-term prospects of the issuer, the credit ratings of the security or issuer, whether the decline in fair value appears to be issuer specific or, alternatively, a reflection of general market or industry conditions, and the Company’s intent and ability to hold the security for a period of time sufficient to allow for a recovery in fair value. Should the Company determine that the decline in the fair value of an equity security was other-than-temporary, the Company recognizes the impairment on the equity security within non-interest income on the consolidated statements of income when identified. For debt securities where the Company does not intend to sell the security and it is not more-likely-than-not that the Company will be required to sell the security before recovery of its amortized cost basis, the other-than-temporary decline in the fair value of the debt security related to: (i) credit loss is recognized in non-interest income on the consolidated statements of income; and (ii) other factors is recognized in AOCI, net of tax. For debt securities where the Company intends to sell the security or more-likely-than-not will be required to sell the security before recovery of its amortized cost, the Company recognizes the OTTI equal to the entire difference between the security’s cost basis and its fair value within non-interest income on the consolidated statements of income. The Bank is a member of the FHLBB and FRBB, and as a member, the Bank is required to hold a certain amount of FHLBB and FRBB common stock. This stock is a non-marketable equity security and, is reported at cost. Loans Held for Sale. The Company has elected the fair value option for loans classified as held for sale on the consolidated statements of condition. Designation of loans as held for sale is determined based on the Company's intent and is, typically, completed as the loans are underwritten. The fair value for loans held for sale is determined using quoted secondary market prices or executed sales agreements. Management constantly evaluates its loan portfolio, in conjunction with asset/liability management practices, and will opt to sell certain loans, typically new 30 -year residential mortgages, to manage the Company's interest rate exposure and for other business purposes, including generating fee income through mortgage sale gains. At December 31, 2016 and 2015, the Company had designated $14.8 million and $11.0 million , respectively, of loans designated as held for sale on its consolidated statements of condition. Originated Loans and Acquired Loans . Loans are reported at amortized cost, or amortized acquired fair value in the case of acquired loans, adjusted for any partial charge-offs and net of any deferred loan fees or costs. For originated loans, interest income is accrued based upon the daily principal amount outstanding except for loans on non-accrual status. For acquired loans, interest income is also accrued based upon the daily principal amount outstanding and is then further adjusted by the accretion of any discount or amortization of any premium associated with the loan. For originated loans, loan fees and certain direct origination costs are deferred and amortized into interest income over the contractual term of the loan using the level-yield method. When a loan is paid off, the unamortized portion is recognized in interest income. A loan is classified as non-accrual generally when it becomes 90 days past due as to interest or principal payments, or sooner if management considers such action to be prudent. All previously accrued but unpaid interest on non-accrual loans is reversed from interest income in the period in which the loan is considered delinquent and the amortization of any unamortized net deferred origination loan fees/costs stops. Interest payments received on non-accrual loans, including impaired loans, are applied as a reduction of principal. A loan remains on non-accrual status until all principal and interest amounts contractually due are brought current and future payments are reasonably assured. Should a loan transition from non-accrual status back to accrual status, the unrecognized interest earned during the period the loan was on non-accrual status and unamortized deferred origination fees and costs are recognized over the remaining contractual life of the loan using the level-yield method. ALL. The ALL is established through provisions for loan losses charged to income. Losses on loans, including impaired loans, are charged to the ALL when all or a portion of a loan is deemed to be uncollectible. Recoveries of loans previously charged off are credited to the ALL when realized. In determining the appropriate level of ALL, the Company uses a methodology to systematically measure the amount of estimated loan loss exposure inherent in the loan portfolio. The methodology includes three elements: (1) identification of loss allocations for certain specific loans, (2) loss allocation factors for certain loan types based on credit risk and loss experience, and (3) general loss allocations for other qualitative and environmental factors. The allocations for specific loans component relates to loans that have a principal balance of $250,000 or more that are classified as substandard or doubtful and are on non-accrual status. For such loans that are also classified as impaired, an allowance is established when the discounted expected future cash flows (or collateral value or observable market price) of the impaired loan is lower than the recorded investment of that loan. Loans that do not meet the above criteria are separated into risk pools by portfolio segment and risk ratings. The Company then evaluates each risk pool collectively for impairment through loss allocation factors. Subsequent to December 31, 2016, the Company amended its internal policy for assessing individual loans for impairment by increasing the principal balance threshold to $500,000 . The qualitative factors for assessing a loan individually for impairment remain unchanged. The change in the Company's internal policy will be effective for periods beginning on January 1, 2017. The Company uses a risk rating system for certain loan segments to determine the credit quality of these loan pools and applies the related loss allocation factors. In assessing the risk rating of a particular loan, the Company considers, among other factors, the obligor’s debt capacity, financial condition, the level of the obligor’s earnings, the amount and sources of repayment, the performance with respect to loan terms, the adequacy of collateral, the level and nature of contingent liabilities, management strength, and the industry in which the obligor operates. These factors are based on an evaluation of historical information, as well as subjective assessment and interpretation of current conditions. Emphasizing one factor over another, or considering additional factors that may be relevant in determining the risk rating of a particular loan but which are not currently an explicit part of the Company's methodology, could impact the risk rating assigned to that loan. The Company at least annually, and more frequently as deemed prudent by management, reassesses and revises the loss allocation factors used in the assignment of loss exposure to appropriately reflect the analysis of loss experience. Portfolios of more homogenous populations of loans including home equity and consumer loans are analyzed as groups taking into account delinquency rates and other economic conditions which may affect the ability of borrowers to meet debt service requirements, including interest rates and energy costs. The Company also considers regulatory guidance, historical loss ranges, portfolio composition, and other changes in the portfolio. An additional allocation is determined based on a judgmental process whereby management considers qualitative and quantitative assessments of other environmental factors. Since the methodology is based upon historical experience and trends, as well as management’s judgment, factors may arise that result in different estimations. Significant factors that could give rise to changes in these estimates may include, but are not limited to, changes in economic conditions in the Company’s market areas, concentration of risk, declines in local property values, and regulatory guidance. Loans past due 30 days or more are considered delinquent. In general, secured loans that are delinquent for 90 consecutive days are placed on non-accrual status, and are subject to impairment and/or loss assessment in accordance with established internal policy. In general, unsecured loans that are delinquent for 90 consecutive days are charged off. In cases where a borrower experiences financial difficulties and the Company makes certain concessionary modifications to contractual terms, the loan is classified as a TDR. Modifications may include adjustments to interest rates, extensions of maturity, and other actions intended to minimize economic loss and avoid foreclosure or repossession of collateral. An allowance is established on a loan classified as a TDR if the present value of expected future cash flows (or, alternatively, the observable market price of the loan or the fair value of the collateral if the loan is collateral-dependent) is less than the recorded investment of the loan. Non-accrual loans that are restructured as TDRs remain on non-accrual status for a period of at least six months to demonstrate that the borrower can meet the restructured terms. If the restructured loan is on accrual status prior to being modified, it is reviewed to determine if the modified loan should remain on accrual status. If the borrower’s ability to meet the revised payment schedule is not reasonably assured, the loan is classified as a non-accrual loan. Loans classified as TDRs remain classified as such for the life of the loan, except in limited circumstances, when it is determined that the borrower is performing under the modified terms and the restructuring agreement specified an interest rate greater than or equal to an acceptable market rate for a comparable new loan at the time of the restructuring. Goodwill and Core Deposit Intangible Assets . Goodwill represents the excess cost of an acquisition over the fair value of the net assets acquired. Goodwill is not subject to amortization but rather is evaluated at least annually for impairment, or as events and circumstances dictate, at the reporting unit level. The Company's two reporting unit levels are (i) banking and (ii) financial services. The banking reporting unit is representative of the Company's core banking business line, while the financial services reporting unit is representative of the Company's wealth management and trust services business line. Any impairment is charged to non-interest expense on the consolidated statements of income. Goodwill is evaluated for impairment by the Company utilizing several standard valuation techniques, including, but not limited to discounted cash flow analyses and comparable transaction market multiples. The Company tests goodwill for impairment annually as of November 30 th utilizing the two-step process and fair value guidance outlined in GAAP. Step one compares the fair value of the reporting unit to its carrying value. If the fair value of the reporting unit is greater than its carrying value, then the reporting unit is not deemed to be impaired and no further assessment is required. However, if the fair value of the reporting unit is below its carrying value, GAAP requires that step two of the goodwill impairment test be performed. Step two involves a process similar to business combination accounting in which fair value is assigned to all assets, liabilities and other identified intangibles to derive an implied fair value of goodwill for the reporting unit. If the implied fair value of goodwill for the reporting unit is greater than its carrying value, then the reporting unit’s goodwill is not impaired. However, if the reporting unit’s implied fair value of goodwill is below its carrying value, an impairment charge is recorded to mark the carrying value of goodwill to the calculated implied fair value. The Company completed its annual goodwill impairment testing as of November 30, 2016 , 2015 and 2014 for each reporting unit and passed step one. As such, step two of the goodwill impairment test was not performed and no goodwill impairment was recognized for the year ended December 31, 2016, 2015 or 2014. Core deposit intangible assets represents the estimated value of acquired customer relationships and is amortized on a straight-line basis over the estimated life of those relationships ( 5 to 10 years from the acquisition dates). Core deposit intangibles are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount may not be recoverable. If necessary, management will test the core deposit intangibles for impairment by comparing its carrying value to the expected undiscounted cash flows of the assets. If the undiscounted cash flows of the intangible assets exceed its carrying value then the intangible assets are deemed to be fully recoverable and not impaired. However, if the undiscounted cash flows of the intangible assets are less than its carrying value then management must compare the fair value of the intangible assets to its carrying value. If the fair value of the intangible assets exceeds its carrying value then the intangible assets are not impaired. If the fair value of the intangible assets is less than its carrying value then an impairment charge is recorded to mark the carrying value of the intangible assets to fair value. For the year ended December 31, 2016 , 2015 or 2014 , there were no events or changes in circumstances that indicated the carrying amount may not be recoverable. BOLI . BOLI represents the cash surrender value of life insurance policies on the lives of certain active and retired employees where the Company is the beneficiary and is recorded as an asset on the Company's consolidated statements of condition. Increases in the cash surrender values of the policies, as well as death benefits received, net of any cash surrender value, are recorded in non-interest income on the consolidated statements of income, and are not subject to income taxes. The Company reviews the financial strength of the insurance carriers prior to the purchase of life insurance policies and no less than annually thereafter. A life insurance policy with any individual carrier is limited to 15% of Tier I capital (as defined for regulatory purposes) and the total cash surrender value of life insurance policies is limited to 25% of Tier I capital. Premises and Equipment . Premises and equipment are stated at cost less accumulated depreciation. Acquired premises and equipment (through the acquisition of a company or branch acquisition) are stated at their estimated fair values as of the acquisition date less accumulated depreciation that occurred subsequent to the acquisition date. Depreciation and amortization are computed on the straight-line method over the estimated useful lives of the related assets. Leasehold improvements are amortized over the lesser of the term of the respective lease or the estimated life of the improvement. Land is carried at cost. OREO . OREO properties acquired through foreclosure or deed-in-lieu of foreclosure are recorded initially at estimated fair value less estimated costs to sell. Any write-down of the recorded investment in the related loan is charged to the ALL upon transfer to OREO. Upon acquisition of a property, a current appraisal is used or an internal valuation is prepared to substantiate fair value of the property. Any subsequent declines in the fair value of a property are recorded as a valuation allowance on the asset. Any subsequent increases in the fair value of a property are recorded as reductions of the valuation allowance, but not below zero. Upon a sale of an OREO property, any excess of the carrying value over the sale proceeds is recognized as a loss on sale. Any excess of sale proceeds over the carrying value of the OREO property is first applied as a recovery to the valuation allowance, if any, with the remainder being recognized as a gain on sale. Operating expenses, including legal and other direct expenses, and changes in the valuation allowance relating to foreclosed assets are included in other non-interest expense on the consolidated statements of income. Mortgage Servicing . Servicing assets are recognized as separate assets when servicing rights are acquired through the sale of residential mortgage loans with servicing rights retained. Capitalized servicing rights, which are reported in other assets on the consolidated statements of condition, are initially recorded at fair value and are amortized in proportion to, and over the period of, the estimated future servicing of the underlying mortgages (typically, the contractual life of the mortgage). 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 characteristics, such as interest rates and terms. Fair value is determined using prices for similar assets with similar characteristics, when available, or based upon discounted cash flows using market-based assumptions. Impairment is recognized through a valuation allowance to the extent that fair value is less than the capitalized amount. If it is later determined that all or a portion of the impairment no longer exists, a reduction of the allowance may be recorded increasing income, but not below zero. Servicing fee income is recorded for fees earned for servicing loans for investors. The fees are based on a contractual percentage of the outstanding principal or a fixed amount per loan and are recorded as income within non-interest income on the consolidated statements of income when earned. The amortization of mortgage servicing rights is recorded as a reduction of loan servicing fee income within non-interest income on the consolidated statements of income. Short-Term and Long-Term Borrowings. Short-term borrowings consist of borrowings maturing within one year of the consolidated statement of condition date, while long-term borrowings consist of borrowings maturing in one or more years. The Company's borrowings include retail and wholesale repurchase agreements, FHLBB overnight and short-term borrowings, federal funds purchased, a capital lease, and line of credit advances. The Company is required to post collateral for certain borrowings, for which it, generally, posts loans and/or investment securities as collateral. Income Taxes . Income taxes are accounted for using the asset and liability method. Under this method, deferred tax assets and liabilities are recognized for the future tax implications attributable to differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax bases. If current information suggests that it is not more likely than not that the Company will be able to realize the deferred tax assets, a valuation allowance is established. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which those temporary differences are expected to be recovered or settled. 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 assesses quarterly whether or not a valuation allowance on its deferred tax assets is necessary. If it is more likely than not that the Company will not be able to realize the benefit of the deferred tax assets then a valuation allowance is established on the deferred tax asset not expected to be realized. At December 31, 2016 and 2015, the Company did not carry a valuation allowance on its deferred tax assets. EPS . Basic EPS excludes dilution and is computed by dividing net income applicable to common stock by the weighted-average number of common shares outstanding for the period. Diluted EPS reflects the potential dilution that could occur if certain securities or other contracts to issue common stock (such as stock options) were exercised or converted into additional common shares that would then share in the earnings of the Company. Diluted EPS is computed by dividing net income applicable to common stock by the weighted-average number of common shares outstanding for the period, plus an incremental number of common-equivalent shares computed using the treasury stock method. Unvested share-based payment awards which include the right to receive non-forfeitable dividends are considered to participate with common stock in undistributed earnings for purposes of computing EPS. Restricted share grants and management stock purchase grants are considered participating securities for this purpose. Accordingly, the Company is required to calculate basic and diluted EPS using the two-class method. The calculation of EPS using the two-class method (i) excludes any dividends paid or owed on participating securities and any undistributed earnings considered to be attributable to participating securities from the numerator and (ii) excludes the dilutive impact of the participating securities from the denominator. Effective September 30, 2016, the Company completed a three-for-two split of its common stock for shareholders of record as of September 15, 2016. As a result, the Company has adjusted its weighted-average shares outstanding, and basic and diluted EPS for the year ended December 31, 2015 and 2014 as presented within Note 14 of the consolidated financial statements to account for the stock split. Refer to Note 13 of the consolidated financial statements for further details of the three-for-two stock split. Postretirement Plans . The Company sponsors various retirement plans for current and former employees, including a postretirement health care plan and life insurance to certain eligible retired employees and a SERP for certain officers of the Company. The cost of providing postretirement health care and life insurance benefits is accrued during the active service period of the employee. The SERP is accrued on a current basis and recognizes costs over the estimated employee service period. Stock-Based Compensation . The fair value of restricted stock and stock options is determined on the grant date. For restricted stock awards and units, compensation is recognized ratably over the requisite service period equal to the fair value of the award. For stock option awards, the fair value is determined using the Black-Scholes option-pricing model. Compensation expense for stock option awards is recognized ratably over the requisite service period equal to the fair value of the award. For performance-based share awards, the Company estimates the degree to which performance conditions will be met to determine the number of shares that will vest and the related compensation expense. Compensation expense is adjusted in the period such estimates change. Non-forfeitab

Mergers and Acquisitions

Mergers and Acquisitions	12 Months Ended
	Dec. 31, 2016
Business Combinations [Abstract]
SBM Acquisition	2016 Activity On November 30, 2016, the Company completed its merger of Acadia Trust, the Company's wholly-owned subsidiary, into the Bank, also the Company's wholly-owned subsidiary, and created a new wealth management and trust division of the Bank, Camden National Wealth Management. The merger did not qualify as a business combination and did not have any effect on the Company's consolidated financial condition. 2015 Activity (share, stock option and share price data have been adjusted for the three-for-two stock split completed by the Company on September 30, 2016 — refer to Note 13) On October 16, 2015, the Company completed its acquisition of 100% of SBM's common stock. The Merger qualified as a tax-free reorganization for federal income tax purposes and, pursuant to the terms and Merger Agreement, each share of SBM common stock outstanding at the effective time of the acquisition was converted into the right to receive, at the election of the stockholder and subject to the allocation and proration procedures described in the Merger Agreement, either: (1) $206.00 in cash, without interest or (2) 8.132 shares of common stock of the Company; provided that 80% of the SBM shares outstanding immediately prior to the effective time of the acquisition were converted into the right to receive common stock of the Company and the remaining SBM shares were converted into the right to receive cash. The total consideration paid by the Company was $136.7 million , consisting of (i) $26.1 million in cash; (ii) 4,124,643 shares of Camden common stock valued at $108.6 million , based on the October 16, 2015 closing price of the Company's common stock of $26.32 per share; and (iii) the fair value of 139,032 non-qualified stock options issued under the 2012 Plan of $2.0 million . Pursuant to the Merger Agreement, all unexercised non-qualified stock options held by SBM option holders immediately vested upon completion of the acquisition and were to roll into the Company's non-qualified stock options using the 8.132 share conversion ratio (rounded down to the nearest whole share). The non-qualified stock options issued under the Company's 2012 Plan maintained the same terms and conditions as previously held under SBM's equity plan. The fair value of the non-qualified stock options approximated the intrinsic value of the non-qualified stock options at acquisition date. The Merger complimented the Company's existing footprint within Maine, while expanding its presence in the higher growth Southern Maine market and into Massachusetts. In addition to providing incremental market share and increasing its presence within Southern Maine, the acquisition improved the Company's interest rate risk exposure in a rising rate environment through a larger mix of variable rate loans as percentage of total loans and additional core deposits (non-interest checking, interest checking, savings and money market accounts). The Company accounted for the Merger using the acquisition method. The acquisition method requires the acquirer to recognize the assets acquired and the liabilities assumed at their fair values as of the acquisition date (with limited exceptions), and does not provide for acquisition expenses to be capitalized as part of the transaction. For the year ended December 31, 2016, 2015 and 2014, the Company incurred $866,000 , $10.4 million and $0 , respectively, of acquisition-related costs as detailed below: For The Year Ended December 31, 2016 2015 2014 Salaries and employee benefits (1) $ 8 $ 3,240 $ — Furniture, equipment and data processing 279 1,531 — Net occupancy 439 1,237 — Consulting and professional fees (2) 80 2,453 — Other expenses (3) 60 1,954 — Total merger and acquisition costs $ 866 $ 10,415 $ — (1) Includes the costs associated with pre-existing change-in-control agreements in place at the time of the Merger and employee termination costs, including severance. (2) Includes the cost of a negotiated non-compete arrangement entered into in connection with the Merger of $400,000 in 2015. (3) Other expenses include marketing and insurance costs, certain contract termination costs, various printing and mailing costs associated with various customer communications, and travel-related costs associated with the integration of the two companies in 2015. Also in connection with the Merger, the Company incurred certain equity issuance costs totaling $612,000 related to the registration of additional shares of the Company's common stock. These costs have been accounted for as a reduction to shareholders' equity and have been presented as such within the Company's consolidated statements of changes in shareholders' equity for the year ended December 31, 2015. The following table summarizes the estimated fair value of the assets acquired and liabilities assumed as of the date of the acquisition: As Acquired Fair Value Adjustments (Previously Reported) Measurement-Period Adjustments As Recorded at Acquisition Consideration Paid: Cash $ 26,125 Company common stock (4,124,643 shares at $26.32 per share) 108,561 Non-qualified stock options 1,990 Total consideration paid 136,676 Recognized identifiable assets acquired and liabilities assumed, at fair value: Loans and loans held for sale $ 639,390 $ (11,497 ) $ 137 628,030 Cash and due from banks 86,042 — — 86,042 Investments 39,716 26 — 39,742 Deferred tax assets 26,293 (1,177 ) 666 25,782 Premises and equipment 16,851 7,093 — 23,944 OREO 2,530 (1,801 ) — 729 Core deposit intangible assets — 6,608 — 6,608 Other assets 5,421 (170 ) 157 5,408 Deposits and borrowings 719,640 1,546 — 721,186 Other liabilities 8,512 (198 ) — 8,314 Total identified assets acquired and liabilities assumed, at fair value $ 88,091 $ (2,266 ) $ 960 86,785 Goodwill $ 49,891 The Company completed its purchase accounting for the Merger by June 30, 2016. In connection with completion of its accounting for the acquisition, the Company made certain measurement-period adjustments that decreased goodwill reported at December 31, 2015 by $960,000 . The measurement-period adjustments did not have a material effect on current year's net income nor will it have a material effect on future years' net income. The Company accounted for the measurement period adjustment prospectively in 2016 in accordance with ASU No. 2015-16, Business Combinations (Topic 805): Simplifying the Accounting for Measurement-Period Adjustments . Upon completion of purchase accounting, the Company recorded $49.9 million of goodwill in connection with the Merger, which was allocated to the Company's banking reporting unit. The goodwill generated represents the synergies expected from combining operations of the two organizations, including, but not limited to, systems conversion, consolidation of bank locations and operation centers, and reduced headcount across operation teams. The goodwill generated from the transaction is not deductible for tax purposes. Fair value adjustments to assets acquired and liabilities assumed are generally amortized using an effective yield, straight-line basis, or other reasonable method consistent with the expected benefit over periods consistent with the estimated useful life or contractual term of the related assets and liabilities.

Securities

Securities	12 Months Ended
	Dec. 31, 2016
Investments, Debt and Equity Securities [Abstract]
Securities	Securities The following tables summarize the amortized costs and estimated fair values of AFS and HTM securities, as of the dates indicated: Amortized Cost Unrealized Gains Unrealized Losses Fair Value December 31, 2016: AFS Securities: Obligations of states and political subdivisions $ 8,848 $ 153 $ — $ 9,001 Mortgage-backed securities issued or guaranteed by U.S. government-sponsored enterprises 485,222 2,515 (7,115 ) 480,622 Collateralized mortgage obligations issued or guaranteed by U.S. government-sponsored enterprises 289,046 265 (5,421 ) 283,890 Subordinated corporate bonds 5,481 132 — 5,613 Total AFS debt securities 788,597 3,065 (12,536 ) 779,126 Equity securities 632 109 — 741 Total AFS securities $ 789,229 $ 3,174 $ (12,536 ) $ 779,867 HTM Securities: Obligations of states and political subdivisions $ 94,609 $ 618 $ (631 ) $ 94,596 Total HTM securities $ 94,609 $ 618 $ (631 ) $ 94,596 December 31, 2015: AFS Securities: Obligations of U.S. government-sponsored enterprises $ 4,971 $ 69 $ — $ 5,040 Obligations of states and political subdivisions 17,355 339 — 17,694 Mortgage-backed securities issued or guaranteed by U.S. government-sponsored enterprises 419,429 3,474 (3,857 ) 419,046 Collateralized mortgage obligations issued or guaranteed by U.S. government-sponsored enterprises 312,719 409 (6,271 ) 306,857 Subordinated corporate bonds 1,000 — (4 ) 996 Total AFS debt securities 755,474 4,291 (10,132 ) 749,633 Equity securities 712 2 (9 ) 705 Total AFS securities $ 756,186 $ 4,293 $ (10,141 ) $ 750,338 HTM Securities: Obligations of states and political subdivisions $ 84,144 $ 1,564 $ (61 ) $ 85,647 Total HTM securities $ 84,144 $ 1,564 $ (61 ) $ 85,647 At December 31, 2016 and 2015 , net unrealized losses on AFS securities included in AOCI amounted to $6.1 million , net of a deferred tax benefit of $3.3 million , and $3.8 million , net of a deferred tax benefit of $2.0 million , respectively. Impaired Investment Securities Management periodically reviews the Company’s investment portfolio to determine the cause, magnitude and duration of declines in the fair value of each security. Thorough evaluations of the causes of the unrealized losses are performed to determine whether the impairment is temporary or other-than-temporary in nature. Considerations such as the ability of the securities to meet cash flow requirements, levels of credit enhancements, risk of curtailment, and recoverability of invested amount over a reasonable period of time, and the length of time the security is in a loss position, for example, are applied in determining OTTI. Once a decline in value is determined to be other-than-temporary, the cost basis of the security is permanently reduced and a corresponding charge to earnings is recognized. The following table presents the estimated fair values and gross unrealized losses of investment securities that were in a continuous loss position at December 31, 2016 and 2015 , by length of time that individual securities in each category have been in a continuous loss position: Less Than 12 Months 12 Months or More Total Fair Value Unrealized Losses Fair Value Unrealized Losses Fair Value Unrealized Losses December 31, 2016: AFS Securities: Mortgage-backed securities issued or guaranteed by U.S. government-sponsored enterprises $ 348,579 $ (5,780 ) $ 29,496 $ (1,335 ) $ 378,075 $ (7,115 ) Collateralized mortgage obligations issued or guaranteed by U.S. government-sponsored enterprises 163,412 (2,906 ) 74,212 (2,515 ) 237,624 (5,421 ) Total AFS securities $ 511,991 $ (8,686 ) $ 103,708 $ (3,850 ) $ 615,699 $ (12,536 ) HTM Securities: Obligations of states and political subdivisions $ 42,805 $ (631 ) $ — $ — $ 42,805 $ (631 ) Total HTM securities $ 42,805 $ (631 ) $ — $ — $ 42,805 $ (631 ) December 31, 2015: AFS Securities: Mortgage-backed securities issued or guaranteed by U.S. government-sponsored enterprises $ 234,897 $ (2,351 ) $ 45,629 $ (1,506 ) $ 280,526 $ (3,857 ) Collateralized mortgage obligations issued or guaranteed by U.S. government-sponsored enterprises 111,143 (1,068 ) 147,180 (5,203 ) 258,323 (6,271 ) Subordinated corporate bonds 996 (4 ) — — 996 (4 ) Equity securities 615 (9 ) — — 615 (9 ) Total AFS securities $ 347,651 $ (3,432 ) $ 192,809 $ (6,709 ) $ 540,460 $ (10,141 ) HTM Securities: Obligations of states and political subdivisions $ 5,507 $ (61 ) $ — $ — $ 5,507 $ (61 ) Total HTM securities $ 5,507 $ (61 ) $ — $ — $ 5,507 $ (61 ) At December 31, 2016 and 2015 , the Company held 209 and 109 investment securities with a fair value of $658.5 million and $546.0 million that were in an unrealized loss position totaling $13.2 million and $10.2 million , respectively, that are considered temporary. Of these, MBS and CMOs with a fair value of $103.7 million and $192.8 million were in an unrealized loss position, and have been in an unrealized loss position for 12 months or more totaling $3.9 million and $6.7 million at December 31, 2016 and 2015 , respectively. The decline in the fair value of the debt securities is reflective of current interest rates in excess of the yield received on investments and was not indicative of an overall credit deterioration or other factors with the Company's investment portfolio. At December 31, 2016 and 2015, gross unrealized losses on the Company's AFS and HTM securities were 2% of the respective investment securities fair value. The Company has the intent and ability to retain its investment securities in an unrealized loss position at December 31, 2016 until the decline in value has recovered. Security Gains and Losses and OTTI of Securities The following table details the Company’s sales of AFS investment securities, the gross realized gains and losses, and OTTI of securities: For The Year Ended December 31, 2016 2015 2014 Proceeds from sales of securities $ 28,850 $ 12,426 $ 25,695 Gross realized gains 125 221 451 Gross realized losses (74 ) (217 ) — Previously recorded OTTI — 204 — For the year ended December 31, 2016 , 2015 , and 2014 , the Company sold certain AFS investment securities with a total carrying value of $28.8 million , $12.4 million , and $25.2 million , respectively, to manage its liquidity and interest rate risk, and recorded net gains on the sale of AFS securities of $51,000 , $4,000 , and $451,000 , respectively, within non-interest income in the consolidated statements of income. The investments securities that were sold were primarily selected based on an assessment of their prepayment speed. FHLBB and FRB Stock As of December 31, 2016 and 2015 , the Company's investment in FHLBB stock was $17.8 million and $20.6 million , respectively. At December 31, 2016 and 2015 , the Company's investment in FRB stock was $5.4 million and $908,000 , respectively. Securities Pledged At December 31, 2016 and 2015 , securities with an amortized cost of $597.3 million and $577.6 million , respectively, and estimated fair values of $589.7 million and $570.9 million , respectively, were pledged to secure FHLBB advances, public deposits, and securities sold under agreements to repurchase, and for other purposes required or permitted by law. Contractual Maturities The amortized cost and estimated fair values of securities by contractual maturity at December 31, 2016 are shown below. Expected maturities will differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties. Amortized Cost Fair Value AFS Securities Due in one year or less $ 1,034 $ 1,039 Due after one year through five years 86,362 86,299 Due after five years through ten years 129,521 129,248 Due after ten years 571,680 562,540 $ 788,597 $ 779,126 HTM Securities Due after one year through five years $ 5,599 $ 5,650 Due after five years through ten years 4,210 4,221 Due after ten years 84,800 84,725 $ 94,609 $ 94,596

Loans and Allowance for Loan Lo

Loans and Allowance for Loan Losses	12 Months Ended
	Dec. 31, 2016
Receivables [Abstract]
Loans and Allowance for Loan Losses	Loans and Allowance for Loan Losses The composition of the Company’s loan portfolio, excluding residential loans held for sale, at December 31, 2016 and 2015 was as follows: December 31, 2016 2015 Residential real estate loans $ 802,494 $ 820,617 Commercial real estate loans 1,050,780 927,951 Commercial loans 333,639 297,721 Home equity loans 329,907 348,634 Consumer loans 17,332 17,953 HPFC 60,412 77,330 Total loans $ 2,594,564 $ 2,490,206 The loan balances for each portfolio segment presented above are net of their respective unamortized fair value mark discount on acquired loans and net of unamortized loan origination (costs) fees totaling: December 31, 2016 2015 Net unamortized fair value mark discount on acquired loans $ 8,810 $ 13,083 Net unamortized loan origination (costs) fees (66 ) 370 Total $ 8,744 $ 13,453 The Bank’s lending activities are primarily conducted in Maine, and its footprint continues to expand into other New England states, including New Hampshire and Massachusetts. The Company originates single family and multi-family residential loans, commercial real estate loans, business loans, municipal loans and a variety of consumer loans. In addition, the Company makes loans for the construction of residential homes, multi-family properties and commercial real estate properties. The ability and willingness of borrowers to honor their repayment commitments is generally dependent on the level of overall economic activity within the geographic area and the general economy. The HPFC loan portfolio consists of niche commercial lending to the small business medical field, including dentists, optometrists and veterinarians across the U.S. The ability and willingness of borrowers to honor their repayment commitments is generally dependent on the success of the borrower's business. Unlike the Bank's loan portfolio, there is, generally, little to no indication of credit quality issues and/or concerns of borrowers honoring their commitments until a payment is delinquent. Generally, once a payment is delinquent, if the payment is not received shortly thereafter to bring the loan current, the loan is deemed impaired (typically within 45 days). Effective February 19, 2016, the Company closed HPFC's operations and is no longer originating loans. The Bank, in the normal course of business, has made loans to certain officers, directors and their associated companies, under terms that are consistent with the Company’s lending policies and regulatory requirements. Loans, including any unused lines of credit, to related parties were as follows: December 31, 2016 2015 Balance at beginning of year $ 16,628 $ 17,469 Loans made/advanced and additions 434 374 Repayments and reductions (1,120 ) (1,215 ) Balance at end of year $ 15,942 $ 16,628 The ALL is management’s best estimate of the inherent risk of loss in the Company’s loan portfolio as of the consolidated statement of condition date. Management makes various assumptions and judgments about the collectability of the loan portfolio and provides an allowance for potential losses based on a number of factors including historical losses. If those assumptions are incorrect, the ALL may not be sufficient to cover losses and may cause an increase in the allowance in the future. Among the factors that could affect the Company’s ability to collect loans and require an increase to the allowance in the future are: (i) financial condition of borrowers; (ii) real estate market changes; (iii) state, regional, and national economic conditions; and (iv) a requirement by federal and state regulators to increase the provision for loan losses or recognize additional charge-offs. The Board of Directors monitors credit risk through the Directors' Loan Review Committee, which reviews large credit exposures, monitors the external loan review reports, reviews the lending authority for individual loan officers when required, and has approval authority and responsibility for all matters regarding the loan policy and other credit-related policies, including reviewing and monitoring asset quality trends, concentration levels, and the ALL methodology. Credit Risk Administration and the Credit Risk Policy Committee oversee the Company's systems and procedures to monitor the credit quality of its loan portfolio, conduct a loan review program, maintain the integrity of the loan rating system, determine the adequacy of the ALL and support the oversight efforts of the Directors' Loan Review Committee and the Board of Directors. The Company's practice is to proactively manage the portfolio such that management can identify problem credits early, assess and implement effective work-out strategies, and take charge-offs as promptly as practical. In addition, the Company continuously reassesses its underwriting standards in response to credit risk posed by changes in economic conditions. For purposes of determining the ALL, the Company disaggregates its loans into portfolio segments, which include residential real estate, commercial real estate, commercial, home equity, consumer and HPFC. Each portfolio segment possesses unique risk characteristics that are considered when determining the appropriate level of allowance. These risk characteristics unique to each portfolio segment include: Residential Real Estate . Residential real estate loans held in the Company's loan portfolio are made to borrowers who demonstrate the ability to make scheduled payments with full consideration to underwriting factors. Borrower qualifications include favorable credit history combined with supportive income requirements and combined loan-to-value ratios within established policy guidelines. Collateral consists of mortgage liens on one- to four-family residential properties. Commercial Real Estate. Commercial real estate loans consist of mortgage loans to finance investments in real property such as multi-family residential, commercial/retail, office, industrial, hotels, educational, health care facilities and other specific use properties. Commercial real estate loans are typically written with amortizing payment structures. Collateral values are determined based upon appraisals and evaluations in accordance with established policy guidelines. Loan-to-value ratios at origination are governed by established policy and regulatory guidelines. Commercial real estate loans are primarily paid by the cash flow generated from the real property, such as operating leases, rents, or other operating cash flows from the borrower. Commercial. Commercial loans consist of revolving and term loan obligations extended to business and corporate enterprises for the purpose of financing working capital and/or capital investment. Collateral generally consists of pledges of business assets including, but not limited to, accounts receivable, inventory, plant and equipment, and/or real estate, if applicable. Commercial loans are primarily paid by the operating cash flow of the borrower. Commercial loans may be secured or unsecured. Home Equity. Home equity loans and lines are made to qualified individuals for legitimate purposes secured by senior or junior mortgage liens on owner-occupied one- to four-family homes, condominiums, or vacation homes. The home equity loan has a fixed rate and is billed as equal payments comprised of principal and interest. The home equity line of credit has a variable rate and is billed as interest-only payments during the draw period. At the end of the draw period, the home equity line of credit is billed as a percentage of the principal balance plus all accrued interest. Borrower qualifications include favorable credit history combined with supportive income requirements and combined loan-to-value ratios within established policy guidelines. Consumer. Consumer loan products including personal lines of credit and amortizing loans made to qualified individuals for various purposes such as education, auto loans, debt consolidation, personal expenses or overdraft protection. Borrower qualifications include favorable credit history combined with supportive income and collateral requirements within established policy guidelines. Consumer loans may be secured or unsecured. HPFC. Prior to the Company's closing of HPFC's operations, effective February 19, 2016, it provided commercial lending to dentists, optometrists and veterinarians, many of which were start-up companies. HPFC's loan portfolio consists of term loan obligations extended for the purpose of financing working capital and/or purchase of equipment. Collateral consists of pledges of business assets including, but not limited to, accounts receivable, inventory, and/or equipment. These loans are primarily paid by the operating cash flow of the borrower and the terms range from seven to ten years. The following table presents the activity in the ALL and select loan information by portfolio segment for the year ended December 31, 2016 , 2015 , and 2014 : Residential Real Estate Commercial Real Estate Commercial Home Equity Consumer HPFC Unallocated Total For The Year Ended December 31, 2016: ALL: Beginning balance $ 4,545 $ 10,432 $ 3,241 $ 2,731 $ 193 $ 24 $ — $ 21,166 Loans charged off (356 ) (315 ) (2,218 ) (308 ) (101 ) (507 ) — (3,805 ) Recoveries 95 50 332 2 7 — — 486 Provision (credit) (1) (124 ) 1,987 2,400 (231 ) 82 1,155 — 5,269 Ending balance $ 4,160 $ 12,154 $ 3,755 $ 2,194 $ 181 $ 672 $ — $ 23,116 ALL balance attributable loans: Individually evaluated for impairment $ 483 $ 1,373 $ — $ 86 $ — $ 65 $ — $ 2,007 Collectively evaluated for impairment 3,677 10,781 3,755 2,108 181 607 — 21,109 Total ending ALL $ 4,160 $ 12,154 $ 3,755 $ 2,194 $ 181 $ 672 $ — $ 23,116 Loans: Individually evaluated for impairment $ 4,348 $ 13,317 $ 2,028 $ 457 $ 7 $ 97 $ — $ 20,254 Collectively evaluated for impairment 798,146 1,037,463 331,611 329,450 17,325 60,315 — 2,574,310 Total loan balances $ 802,494 $ 1,050,780 $ 333,639 $ 329,907 $ 17,332 $ 60,412 $ — $ 2,594,564 For The Year Ended December 31, 2015: ALL: Beginning balance $ 4,899 $ 7,951 $ 3,354 $ 2,247 $ 281 $ — $ 2,384 $ 21,116 Loans charged off (801 ) (481 ) (655 ) (525 ) (154 ) — — (2,616 ) Recoveries 55 74 389 188 22 — — 728 Provision (credit) (1) 392 2,888 153 821 44 24 (2,384 ) 1,938 Ending balance $ 4,545 $ 10,432 $ 3,241 $ 2,731 $ 193 $ 24 $ — $ 21,166 ALL balance attributable loans: Individually evaluated for impairment $ 544 $ 644 $ 92 $ 89 $ — $ — $ — $ 1,369 Collectively evaluated for impairment 4,001 9,788 3,149 2,642 193 24 — 19,797 Total ending ALL $ 4,545 $ 10,432 $ 3,241 $ 2,731 $ 193 $ 24 $ — $ 21,166 Loans: Individually evaluated for impairment $ 6,026 $ 4,610 $ 3,937 $ 588 $ 74 $ — $ — $ 15,235 Collectively evaluated for impairment 814,591 923,341 293,784 348,046 17,879 77,330 — 2,474,971 Total loan balances $ 820,617 $ 927,951 $ 297,721 $ 348,634 $ 17,953 $ 77,330 $ — $ 2,490,206 For The Year Ended December 31, 2014: Residential Real Estate Commercial Real Estate Commercial Home Equity Consumer HPFC Unallocated Total ALL: Beginning balance $ 5,603 $ 7,206 $ 3,388 $ 2,403 $ 319 $ — $ 2,671 $ 21,590 Loans charged off (785 ) (361 ) (1,544 ) (611 ) (143 ) — — (3,444 ) Recoveries 165 136 394 19 32 — — 746 Provision (credit) (1) (84 ) 970 1,116 436 73 — (287 ) 2,224 Ending balance $ 4,899 $ 7,951 $ 3,354 $ 2,247 $ 281 $ — $ 2,384 $ 21,116 ALL balance attributable loans: Individually evaluated for impairment $ 787 $ 78 $ 10 $ — $ 78 $ — $ — $ 953 Collectively evaluated for impairment 4,112 7,873 3,344 2,247 203 — 2,384 20,163 Total ending ALL $ 4,899 $ 7,951 $ 3,354 $ 2,247 $ 281 $ — $ 2,384 $ 21,116 Loans: Individually evaluated for impairment $ 6,411 $ 5,379 $ 646 $ 331 $ 157 $ — $ — $ 12,924 Collectively evaluated for impairment 579,057 635,282 256,869 271,378 17,100 — — 1,759,686 Total loan balances $ 585,468 $ 640,661 $ 257,515 $ 271,709 $ 17,257 $ — $ — $ 1,772,610 (1) The provision (credit) for loan losses excludes any impact for the change in the reserve for unfunded commitments, which represents management's estimate of the amount required to reflect the probable inherent losses on outstanding letters of credit and unused lines of credit. The reserve for unfunded commitments is presented within accrued interest and other liabilities on the consolidated statements of condition. At December 31, 2016 , 2015 , and 2014 , the reserve for unfunded commitments was $11,000 , $22,000 and $17,000 , respectively. The following table reconciles the year ended December 31, 2016 , 2015 , and 2014 provision for loan losses to the provision for credit losses as presented on the consolidated statement of income: For the Year Ended December 31, 2016 2015 2014 Provision for loan losses $ 5,269 $ 1,938 $ 2,224 Change in reserve for unfunded commitments (11 ) (2 ) (4 ) Provision for credit losses $ 5,258 $ 1,936 $ 2,220 The Company did not have any significant changes to its ALL methodology for the year ended December 31, 2016. In the fourth quarter of 2015, the Company revised its methodology for the ALL whereby it no longer provided for an unallocated reserve, but, instead, incorporated the qualitative factors into the Company's general reserve. Historically, the unallocated reserve served as a method to account for qualitative risks, including general economic and market risks, within its portfolio without specifically assigning to any one or more portfolio segments. At December 31, 2016 and 2015, the Company’s reported unallocated reserve was $0 . The change in methodology did not have any impact on the Company's reported ALL or provision for loan losses at or for the year ended December 31, 2015. The Company focuses on maintaining a well-balanced and diversified loan portfolio. Despite such efforts, it is recognized that credit concentrations may occasionally emerge as a result of economic conditions, changes in local demand, natural loan growth and runoff. To ensure that credit concentrations can be effectively identified, all commercial and commercial real estate loans are assigned Standard Industrial Classification codes, North American Industry Classification System codes, and state and county codes. Shifts in portfolio concentrations are monitored by Credit Risk Administration. As of December 31, 2016 , the non-residential building operators' industry concentration was 12% of the Company's total loan portfolio and 31% of the total commercial real estate portfolio. There were no other industry concentrations exceeding 10% of the Company's total loan portfolio as of December 31, 2016 . To further identify loans with similar risk profiles, the Company categorizes each portfolio segment into classes by credit risk characteristic and applies a credit quality indicator to each portfolio segment. The indicators for commercial, commercial real estate and residential real estate loans are represented by Grades 1 through 10 as outlined below. In general, risk ratings are adjusted periodically throughout the year as updated analysis and review warrants. This process may include, but is not limited to, annual credit and loan reviews, periodic reviews of loan performance metrics, such as delinquency rates, and quarterly reviews of adversely risk rated loans. The Company uses the following definitions when assessing grades for the purpose of evaluating the risk and adequacy of the ALL: • Grade 1 through 6 — Grades 1 through 6 represent groups of loans that are not subject to adverse criticism as defined in regulatory guidance. Loans in these groups exhibit characteristics that represent low to moderate risks, which is measured using a variety of credit risk criteria, such as cash flow coverage, debt service coverage, balance sheet leverage, liquidity, management experience, industry position, prevailing economic conditions, support from secondary sources of repayment and other credit factors that may be relevant to a specific loan. In general, these loans are supported by properly margined collateral and guarantees of principal parties. • Grade 7 — Loans with potential weakness (Special Mention). Loans in this category are currently protected based on collateral and repayment capacity and do not constitute undesirable credit risk, but have potential weakness that may result in deterioration of the repayment process at some future date. This classification is used if a negative trend is evident in the obligor’s financial situation. Special mention loans do not sufficiently expose the Company to warrant adverse classification. • Grade 8 — Loans with definite weakness (Substandard). Loans classified as substandard are inadequately protected by the current sound worth and paying capacity of the obligor or by collateral pledged. Borrowers experience difficulty in meeting debt repayment requirements. Deterioration is sufficient to cause the Company to look to the sale of collateral. • Grade 9 — Loans with potential loss (Doubtful). Loans classified as doubtful have all the weaknesses inherent in the substandard grade with the added characteristic that the weaknesses make collection or liquidation of the loan in full highly questionable and improbable. The possibility of some loss is extremely high, but because of specific pending factors that may work to the advantage and strengthening of the asset, its classification as an estimated loss is deferred until its more exact status may be determined. • Grade 10 — Loans with definite loss (Loss). Loans classified as loss are considered uncollectible. The loss classification does not mean that the asset has absolutely no recovery or salvage value, but rather that it is not practical or desirable to defer writing off the asset because recovery and collection time may be protracted. Asset quality indicators are periodically reassessed to appropriately reflect the risk composition of the Company’s loan portfolio. Home equity and consumer loans are not individually risk rated, but rather analyzed as groups taking into account delinquency rates and other economic conditions which may affect the ability of borrowers to meet debt service requirements, including interest rates and energy costs. Performing loans include loans that are current and loans that are past due less than 90 days. Loans that are past due over 90 days and non-accrual loans, including TDRs, are considered non-performing. The following table summarizes credit risk exposure indicators by portfolio segment as of the following dates: Residential Real Estate Commercial Real Estate Commercial Home Equity Consumer HPFC Total December 31, 2016: Pass (Grades 1 – 6) $ 789,554 $ 1,003,386 $ 321,148 $ — $ — $ 58,943 $ 2,173,031 Performing — — — 328,287 17,328 — 345,615 Special Mention (Grade 7) 2,387 5,724 5,598 — — 257 13,966 Substandard (Grade 8) 10,553 41,670 5,437 — — 1,212 58,872 Doubtful (Grade 9) — — 1,456 — — — 1,456 Non-performing — — — 1,620 4 — 1,624 Total $ 802,494 $ 1,050,780 $ 333,639 $ 329,907 $ 17,332 $ 60,412 $ 2,594,564 December 31, 2015: Pass (Grades 1 – 6) $ 802,873 $ 868,664 $ 281,553 $ — $ — $ 70,173 $ 2,023,263 Performing — — — 346,701 17,835 — 364,536 Special Mention (Grade 7) 3,282 20,732 7,527 — — 3,179 34,720 Substandard (Grade 8) 14,462 38,555 8,641 — — 3,978 65,636 Non-performing — — — 1,933 118 — 2,051 Total $ 820,617 $ 927,951 $ 297,721 $ 348,634 $ 17,953 $ 77,330 $ 2,490,206 The Company closely monitors the performance of its loan portfolio for both the Bank and HPFC. A loan is placed on non-accrual status when the financial condition of the borrower is deteriorating, payment in full of both principal and interest is not expected as scheduled or principal or interest has been in default for 90 days or more. Exceptions may be made if the asset is well-secured by collateral sufficient to satisfy both the principal and accrued interest in full and collection is reasonably assured. When one loan to a borrower is placed on non-accrual status, all other loans to the borrower are re-evaluated to determine if they should also be placed on non-accrual status. All previously accrued and unpaid interest is reversed at this time. A loan will return to accrual status when collection of principal and interest is assured and the borrower has demonstrated timely payments of principal and interest for a reasonable period. Unsecured loans, however, are not normally placed on non-accrual status because they are charged-off once their collectability is in doubt. The following is a loan aging analysis by portfolio segment (including loans past due over 90 days and non-accrual loans) and a summary of non-accrual loans, which include TDRs, and loans past due over 90 days and accruing as of the following dates: 30 – 59 Days Past Due 60 – 89 Days Past Due Greater Than 90 Days Total Past Due Current Total Loans Outstanding Loans > 90 Days Past Due and Accruing Non-Accrual Loans December 31, 2016: Residential real estate $ 1,783 $ 924 $ 2,904 $ 5,611 $ 796,883 802,494 $ — $ 3,945 Commercial real estate 855 223 12,625 13,703 1,037,077 1,050,780 — 12,849 Commercial 633 218 1,675 2,526 331,113 333,639 — 2,088 Home equity 892 134 1,321 2,347 327,560 329,907 — 1,620 Consumer 38 — 4 42 17,290 17,332 — 4 HPFC 438 688 110 1,236 59,176 60,412 — 207 Total $ 4,639 $ 2,187 $ 18,639 $ 25,465 $ 2,569,099 $ 2,594,564 $ — $ 20,713 December 31, 2015: Residential real estate $ 3,325 $ 571 $ 6,077 $ 9,973 $ 810,644 $ 820,617 $ — $ 7,253 Commercial real estate 4,219 2,427 1,584 8,230 919,721 927,951 — 4,529 Commercial 267 550 1,002 1,819 295,902 297,721 — 4,489 Home equity 643 640 1,505 2,788 345,846 348,634 — 1,933 Consumer 112 7 118 237 17,716 17,953 — 118 HPFC 165 — — 165 77,165 77,330 — — Total $ 8,731 $ 4,195 $ 10,286 $ 23,212 $ 2,466,994 $ 2,490,206 $ — $ 18,322 Interest income that would have been recognized if loans on non-accrual status had been current in accordance with their original terms for the year ended December 31, 2016 , 2015 , and 2014 was $888,000 , $586,000 , and $842,000 , respectively. TDRs: The Company takes a conservative approach with credit risk management and remains focused on community lending and reinvesting. The Company works closely with borrowers experiencing credit problems to assist in loan repayment or term modifications. TDR loans consist of loans where the Company, for economic or legal reasons related to the borrower’s financial difficulties, granted a concession to the borrower that it would not otherwise consider. TDRs, typically, involve term modifications or a reduction of either interest or principal. Once such an obligation has been restructured, it will remain a TDR until paid in full, or until the loan is again restructured at current market rates and no concessions are granted. The specific reserve allowance was determined by discounting the total expected future cash flows from the borrower at the original loan interest rate, or if the loan is currently collateral-dependent, using the NRV, which was obtained through independent appraisals and internal evaluations. The following is a summary of TDRs, by portfolio segment, and the associated specific reserve included within the ALL as of December 31: Number of Contracts Recorded Investment Specific Reserve 2016 2015 2016 2015 2016 2015 Residential real estate 21 22 $ 3,221 $ 3,398 $ 483 $ 544 Commercial real estate 3 6 1,008 1,459 — 48 Commercial 10 9 1,502 399 — 11 Consumer and home equity 1 1 16 21 — — Total 35 38 $ 5,747 $ 5,277 $ 483 $ 603 At December 31, 2016 , the Company had performing and non-performing TDRs with a recorded investment balance of $4.3 million and $1.4 million , respectively. At December 31, 2015 , the Company had performing and non-performing TDRs with a recorded investment balance of $4.8 million and $446,000 , respectively. The following represents loan modifications that occurred for the year ended December 31, 2016 , 2015 and 2014 that qualify as TDRs and the type of loan modification made by portfolio segment at December 31: Number of Contracts Pre-Modification Outstanding Recorded Investment Post-Modification Outstanding Recorded Investment Specific Reserve 2016 2015 2014 2016 2015 2014 2016 2015 2014 2016 2015 2014 Residential real estate: Maturity concession — — 1 $ — $ — $ 136 $ — $ — $ 149 $ — $ — $ 43 Court ordered — 1 — — 74 — — 78 — — 27 — Commercial real estate: Maturity concession — — 1 — — 235 — — 235 — — — Commercial: Maturity concession 6 — — 2,973 — — 2,973 — — 1,400 — — Court ordered — — 3 — — 77 — — 77 — — 6 Home equity: Principal forgiveness and maturity — — 1 — — 40 — — 30 — — — Total 6 1 6 $ 2,973 $ 74 $ 488 $ 2,973 $ 78 $ 491 $ 1,400 $ 27 $ 49 During the third quarter of 2016, the Company completed the restructure of one commercial relationship for which there were six individual commercial loans. The Company had a specific reserve on these loans totaling $1.4 million that was charged-off subsequent to the loan modification. Additionally, as part of the restructure, the Company committed to lend additional funds of up to $280,000 , and, at December 31, 2016, the Company had loaned $47,000 on its commitment. The Company did no t have any other commitments to lend additional funds to borrowers with loans classified as TDRs as of December 31, 2016. For the year ended December 31, 2016, 2015 and 2014, the Company did no t have any loans that had been modified as a TDR within the previous 12 months and for which the borrower subsequently defaulted for the periods indicated. Impaired Loans: Impaired loans consist of non-accrual and TDR loans that are individually evaluated for impairment in accordance with the Company's policy. The following is a summary of impaired loan balances and the associated allowance by portfolio segment as of and for the year ended December 31, 2016 , 2015 and 2014 : Recorded Investment Unpaid Principal Balance Related Allowance Average Recorded Investment Interest Income Recognized December 31, 2016: With related allowance recorded: Residential real estate $ 3,019 $ 3,019 $ 483 $ 3,088 $ 106 Commercial real estate 11,443 11,443 1,373 5,165 — Commercial — — — 762 — Home equity 299 299 86 305 — Consumer — — — — — HPFC 97 97 65 98 — Ending Balance 14,858 14,858 2,007 9,418 106 Without related allowance recorded: Residential real estate 1,329 1,800 — 2,057 9 Commercial real estate 1,874 2,369 — 2,214 51 Commercial 2,028 3,209 — 2,507 16 Home equity 158 368 — 180 — Consumer 7 10 — 12 — HPFC — — — — — Ending Balance 5,396 7,756 — 6,970 76 Total impaired loans $ 20,254 $ 22,614 $ 2,007 $ 16,388 $ 182 December 31, 2015: With related allowance recorded: Residential real estate $ 3,191 $ 3,191 $ 544 $ 6,064 $ 112 Commercial real estate 1,825 1,857 644 1,753 — Commercial 156 156 92 945 2 Home equity 303 303 89 900 — Consumer — — — 195 — HPFC — — — — — Ending Balance 5,475 5,507 1,369 9,857 114 Without related allowance recorded: Residential real estate 2,835 4,353 — 2,175 8 Commercial real estate 2,785 3,426 — 2,719 65 Commercial 3,781 4,325 — 1,412 17 Home equity 285 688 — 369 — Consumer 74 150 — 20 — HPFC — — — — — Ending Balance 9,760 12,942 — 6,695 90 Total impaired loans $ 15,235 $ 18,449 $ 1,369 $ 16,552 $ 204 Recorded Investment Unpaid Principal Balance Related Allowance Average Recorded Investment Interest Income Recognized December 31, 2014: With related allowance recorded: Residential real estate $ 4,468 $ 4,468 $ 787 $ 9,254 $ 125 Commercial real estate 1,140 1,140 78 4,721 — Commercial 183 183 10 2,366 8 Home equity — — — 1,428 — Consumer 140 140 78 348 — Ending Balance 5,931 5,931 953 18,117 133 Without related allowance recorded: Residential real estate 1,943 2,604 — 2,257 7 Commercial real estate 4,239 4,502 — 2,869 40 Commercial 463 606 — 791 11 Home equity 331 581 — 399 — Consumer 17 37 — 21 — Ending Balance 6,993 8,330 — 6,337 58 Total impaired loans $ 12,924 $ 14,261 $ 953 $ 24,454 $ 191 The impaired loan information presented above as of and for the year ended December 31, 2015 and 2014 has been revised to disclose only those impaired loans that are individually evaluated for impairment in accordance with the Company's policy, which includes (i) loans with a principal balance greater than $250,000 or more and are classified as substandard or doubtful and are on non-accrual status and (ii) all TDRs. Previously, the Company's impaired loan disclosures included certain non-accrual loans which were collectively evaluated under ASC 450-20. The revision of prior period information had no impact on the Company's ALL, provision for loan losses, or its asset quality ratios as of and for the year ended December 31, 2015 and 2014. In-Process Foreclosure Proceedings: At December 31, 2016 and 2015 , the Company had $1.4 million and $2.9 million of consumer mortgage loans secured by residential real estate properties for which foreclosure proceedings were in process. The Company continues to be focused on working these consumer mortgage loans through the foreclosure process to resolution; however, the foreclosure process, typically, will take 18 to 24 months due to the State of Maine foreclosure laws.

Goodwill and Other Intangible A

Goodwill and Other Intangible Assets	12 Months Ended
	Dec. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill	Goodwill The changes in goodwill for the year ended December 31, 2016 and 2015 for each reporting unit are shown in the table below: Banking Financial Services Total December 31, 2014: Goodwill $ 40,902 $ 7,474 $ 48,376 Accumulated impairment losses — (3,570 ) (3,570 ) Reported goodwill 40,902 3,904 44,806 2015 activity (1) 50,851 — 50,851 December 31, 2015: Goodwill 91,753 7,474 99,227 Accumulated impairment losses — (3,570 ) (3,570 ) Reported goodwill 91,753 3,904 95,657 2016 activity (1) (960 ) — (960 ) December 31, 2016: Goodwill 90,793 7,474 98,267 Accumulated impairment losses — (3,570 ) (3,570 ) Reported goodwill $ 90,793 $ 3,904 $ 94,697 (1) On October 16, 2015, the Company completed the Merger and goodwill of $49.9 million after recording a measurement-period adjustment decreasing goodwill of $960,000 in 2016 upon completion of purchase accounting. Refer to Note 2 for additional details and discussion. The Company performs its annual goodwill impairment assessment as of November 30 th , and at interim periods if indicators of potential impairment exist. The Company completed its annual goodwill impairment test as of November 30, 2016 , 2015 and 2014 for each reporting unit and . Other Intangible Assets The changes in core deposit intangible and trust relationship intangible assets for the year ended December 31, 2016 and 2015 are shown in the table below: Core Deposit Intangible Trust Relationship Intangible Gross Accumulated Amortization Net Gross Accumulated Amortization Net Total Balance at December 31, 2014 $ 17,300 $ (14,161 ) $ 3,139 $ 753 $ (527 ) $ 226 $ 3,365 2015 activity 6,608 (1,231 ) 5,377 — (75 ) (75 ) 5,302 Balance at December 31, 2015 23,908 (15,392 ) 8,516 753 (602 ) 151 8,667 2016 activity — (1,828 ) (1,828 ) — (75 ) (75 ) (1,903 ) Balance at December 31, 2016 $ 23,908 $ (17,220 ) $ 6,688 $ 753 $ (677 ) $ 76 $ 6,764 On October 16, 2015, the Company completed the Merger and, in doing so, recorded core deposit intangible assets of $6.6 million . The core deposit intangible assets will amortize over a 10 year period using an accelerated depreciation method that aligns with the estimated economic benefit of the asset. For the year ended December 31, 2016 , 2015 and 2014 , the Company recorded amortization expense of $1.9 million , $1.3 million and $1.1 million , respectively. The following table reflects the expected amortization schedule for intangible assets over the period of estimated economic benefit (assuming no additional intangible assets are created or impaired): Core Deposit Intangible Trust Relationship Intangible Total 2017 $ 1,735 $ 76 $ 1,811 2018 725 — 725 2019 705 — 705 2020 682 — 682 2021 655 — 655 Thereafter 2,186 — 2,186 Total $ 6,688 $ 76 $ 6,764

Other Intangible Assets (Notes)

Other Intangible Assets (Notes)	12 Months Ended
	Dec. 31, 2016
Other Intangible Assets [Abstract]
Other Intangibles Assets	Goodwill The changes in goodwill for the year ended December 31, 2016 and 2015 for each reporting unit are shown in the table below: Banking Financial Services Total December 31, 2014: Goodwill $ 40,902 $ 7,474 $ 48,376 Accumulated impairment losses — (3,570 ) (3,570 ) Reported goodwill 40,902 3,904 44,806 2015 activity (1) 50,851 — 50,851 December 31, 2015: Goodwill 91,753 7,474 99,227 Accumulated impairment losses — (3,570 ) (3,570 ) Reported goodwill 91,753 3,904 95,657 2016 activity (1) (960 ) — (960 ) December 31, 2016: Goodwill 90,793 7,474 98,267 Accumulated impairment losses — (3,570 ) (3,570 ) Reported goodwill $ 90,793 $ 3,904 $ 94,697 (1) On October 16, 2015, the Company completed the Merger and goodwill of $49.9 million after recording a measurement-period adjustment decreasing goodwill of $960,000 in 2016 upon completion of purchase accounting. Refer to Note 2 for additional details and discussion. The Company performs its annual goodwill impairment assessment as of November 30 th , and at interim periods if indicators of potential impairment exist. The Company completed its annual goodwill impairment test as of November 30, 2016 , 2015 and 2014 for each reporting unit and . Other Intangible Assets The changes in core deposit intangible and trust relationship intangible assets for the year ended December 31, 2016 and 2015 are shown in the table below: Core Deposit Intangible Trust Relationship Intangible Gross Accumulated Amortization Net Gross Accumulated Amortization Net Total Balance at December 31, 2014 $ 17,300 $ (14,161 ) $ 3,139 $ 753 $ (527 ) $ 226 $ 3,365 2015 activity 6,608 (1,231 ) 5,377 — (75 ) (75 ) 5,302 Balance at December 31, 2015 23,908 (15,392 ) 8,516 753 (602 ) 151 8,667 2016 activity — (1,828 ) (1,828 ) — (75 ) (75 ) (1,903 ) Balance at December 31, 2016 $ 23,908 $ (17,220 ) $ 6,688 $ 753 $ (677 ) $ 76 $ 6,764 On October 16, 2015, the Company completed the Merger and, in doing so, recorded core deposit intangible assets of $6.6 million . The core deposit intangible assets will amortize over a 10 year period using an accelerated depreciation method that aligns with the estimated economic benefit of the asset. For the year ended December 31, 2016 , 2015 and 2014 , the Company recorded amortization expense of $1.9 million , $1.3 million and $1.1 million , respectively. The following table reflects the expected amortization schedule for intangible assets over the period of estimated economic benefit (assuming no additional intangible assets are created or impaired): Core Deposit Intangible Trust Relationship Intangible Total 2017 $ 1,735 $ 76 $ 1,811 2018 725 — 725 2019 705 — 705 2020 682 — 682 2021 655 — 655 Thereafter 2,186 — 2,186 Total $ 6,688 $ 76 $ 6,764

Premises and Equipment

Premises and Equipment	12 Months Ended
	Dec. 31, 2016
Property, Plant and Equipment [Abstract]
Premises and Equipment	Premises and Equipment Details of premises and equipment, at cost, at December 31, were as follows: 2016 2015 Land and land improvements $ 3,012 $ 3,102 Buildings and leasehold improvements 36,958 37,926 Furniture, fixtures and equipment 34,043 35,083 Total cost 74,013 76,111 Accumulated depreciation and amortization (31,140 ) (30,152 ) Net premises and equipment $ 42,873 $ 45,959 Depreciation and amortization expense for the Company for periods indicated were as follows: For The Year Ended December 31, Fixed Asset Type Income Statement Line Item 2016 2015 2014 Equipment and data Furniture, equipment and data processing $ 1,942 $ 1,620 $ 1,713 Premises Net occupancy costs 1,757 1,140 1,003 Software Furniture, equipment and data processing 275 337 335 Equipment, data and premises Merger and acquisition costs 452 517 — Total $ 4,426 $ 3,614 $ 3,051 At December 31, 2016 and 2015 , the Company has capitalized software costs of $ 3.6 million and $3.8 million , respectively, and related accumulated depreciation expense of $3.2 million and $3.3 million , respectively, and was presented within other assets on the consolidated statements of condition. Included in merger and acquisition costs on the consolidated statements of income for the year ended December 31, 2015 was $1.1 million of fixed asset disposal costs incurred as a result of the Merger. The Company did no t have any material gains or losses from the sale of premises and equipment for the year ended December 31, 2016, 2015 or 2014. The Company enters into noncancellable lease arrangements primarily for its office buildings and branch facilities. Certain lease arrangements contain clauses requiring increasing rental payments over the lease term, which may be indexed to an index (commonly the Consumer Price Index) or the increases may be contractually stipulated. Furthermore, many of these lease arrangements provide the Company with the option to renew the lease arrangement after the initial lease term. The Company incurred expenses of $1.8 million , $1.7 million and $1.2 million for the year ended December 31, 2016 , 2015 and 2014 , respectively, associated with its operating lease arrangements. The Company has one capital lease for a branch facility with payments that extend until 2026 at an interest rate of 9.75% per year. The capital lease, recorded in premises and equipment, has a cost basis of $855,000 at December 31, 2016 and 2015 and accumulated depreciation of $459,000 and $416,000 at December 31, 2016 and 2015 , respectively. The associated depreciation expense was reported within net occupancy costs on the consolidated statements of income. In connection with the Merger, the Company assumed a lease arrangement between SBM's wholly-owned subsidiary, The Bank of Maine, and two of its employees. The lease is for a period of five years with an expiration date of December 1, 2019 with two consecutive five year extension periods available at the option of the Company. The lease arrangement contains certain termination clauses whereby the Company has the right to terminate the lease arrangement should the employees be terminated and/or certain mortgage loan production metrics not be met over a consecutive 12 month period. At December 31, 2016 , under current operating and capital lease contracts, the Company had the following schedule of future minimum lease payments: Operating Capital 2017 $ 1,427 $ 126 2018 1,186 126 2019 1,144 126 2020 644 126 2021 447 130 Thereafter 1,783 555 Total minimum lease payments $ 6,631 1,189 Less: amount representing interest (1) 331 Present value of net minimum lease payments (2) $ 858 (1) Amount necessary to reduce net minimum lease payments to present value calculated at the Company's incremental borrowing rate at lease inception. (2) Reflects the liability reported within short- and long-term borrowings on the consolidated statements of condition. At December 31, 2016 and 2015 , the capital lease liability was $858,000 and $922,000 , respectively.

Mortgage Servicing

Mortgage Servicing	12 Months Ended
	Dec. 31, 2016
Transfers and Servicing [Abstract]
Mortgage Servicing	Mortgage Banking Residential real estate mortgages are originated by the Company both for its portfolio and for sale into the secondary market. The transfer of these financial assets is accounted for as sales when control over the assets has been surrendered. Control over transferred assets is deemed to be surrendered when (i) the assets have been isolated from the Company, (ii) 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 (ii) the Company does not maintain effective control over the transferred assets through an agreement to repurchase them before their maturity. The Company may sell its loans to institutional investors and may do so on either a servicing rights released basis or servicing rights retained basis. Should the Company enter into an agreement with the investor to retain or acquire the servicing rights, the Company will record a servicing asset. The Company will enter into an agreement with the investor to pay an agreed-upon rate on the loan, which is less than the interest rate received from the borrower. The Company will retain the difference as a fee for servicing the loan. The Company will capitalize the MSR at fair value within other assets on the statements of condition upon sale of the related loan, and subsequently amortize the asset over the estimated life of the serviced loan and assesses quarterly the asset for impairment. For the year ended December 31, 2016, 2015 and 2014, the Company earned servicing fee income for its servicing assets of $1.1 million , $597,000 and $484,000 , respectively, and was presented in mortgage banking income, net on the consolidated statements of income. For the year ended December 31, 2016, 2015 and 2014, the Company sold $232.2 million , $61.2 million and $799,000 , respectively, of residential mortgage loans on the secondary market, which resulted in a net gain on sale of loans (net of costs, including direct and indirect origination costs) of $6.2 million , $1.3 million , and $31,000 , respectively. Additionally, at December 31, 2016 and 2015, the Company had identified and designated loans with an unpaid principal balance of $15.1 million and $10.8 million , respectively, as held for sale. The Company elected the fair value option for its loans designated as held for sale, and at December 31, 2016, the unrealized loss was $289,000 and at December 31, 2015 the unrealized gain was $133,000 . The unrealized gain or loss on its loans held for sale portfolio is driven by changes in market interest rates and is not impacted by credit quality risks associated with the borrower due to the short-term duration between time of closing and funding of the loan and sale. Included within the Company's mortgage banking income, net on its consolidated statements of income for the year ended December 31, 2016, 2015 and 2014 was the change in unrealized gains (losses) on loans held for sale of ($422,000) , $133,000 and $0 , respectively. The Company mitigates its interest rate exposure on its loans designated as held for sale through forward delivery commitments with investors at the onset of the mortgage origination process, typically on a "best-efforts" basis, with certain approved investors. Refer to Note 18 for further discussion of the Company's forward delivery commitments at December 31, 2016 and 2015 and the offsetting gain (losses) recorded on loans held for sale. The Company's MSRs, net of a valuation allowance, included in other assets on the consolidated statements of condition at December 31, 2016 and 2015 was $1.2 million and $2.2 million , respectively. The Company obtains third party valuations based on loan level data stratified by note rate, type and term of the underlying loans to determine MSR amortization and valuation. The model utilizes a variety of assumptions, the most significant of which are loan prepayment assumptions and the discount rate used to discount future cash flows. Prepayment assumptions, which are impacted by loan rates and terms, are calculated using a three-month moving average of weekly prepayment data published by the Public Securities Association and modeled against the serviced loan portfolio by the third party valuation specialist. The discount rate is the quarterly average 10 -year U.S. Treasury rate plus a risk premium. At December 31, 2016 and 2015 , the prepayment assumption used within the model was 14.6% and 11.0% , respectively, and the discount rate was 7.8% and 7.5% . The estimated effect of a 10% and 20% adverse change to the prepayment assumption at December 31, 2016 was a decrease of $97,000 and $185,000 , respectively, while a 10% and 20% adverse change to the discount rate assumption was a decrease of $57,000 and $111,000 . Other assumptions include delinquency rates, foreclosure rates, servicing cost inflation, and annual unit loan cost. All assumptions are adjusted periodically to reflect current circumstances. The following summarizes MSRs capitalized and amortized, along with the activity in the related valuation allowance: As of and For The Year Ended December 31, 2016 2015 2014 MSRs: Balance at beginning of year $ 2,161 $ 493 $ 726 Capitalized servicing right fees upon sale (1) 9 294 15 Acquired in connection with SBM acquisition, at fair value — 1,608 — Amortization charged against mortgage servicing fee income (1) (734 ) (231 ) (262 ) Valuation adjustment (226 ) (3 ) 14 Balance at end of year $ 1,210 $ 2,161 $ 493 Valuation Allowance: Balance at beginning of year $ (4 ) $ (1 ) $ (15 ) (Increase) decrease in impairment reserve (1) (226 ) (3 ) 14 Balance at end of year $ (230 ) $ (4 ) $ (1 ) Fair value, beginning of year (2) $ 2,947 $ 1,447 $ 1,494 Fair value, end of year (2) $ 1,701 $ 2,947 $ 1,447 (1) Reported within mortgage banking income, net on the Company's consolidated statements of income. (2) Reported fair value represents all MSRs currently being serviced by the Company. Mortgage loans serviced for third party investors, including mortgage loans where the Company serves as the sub-servicer for which it does not have a corresponding servicing right asset, are not included within the Company's loan portfolio on its consolidated statements of condition. The unpaid principal balance on mortgage loans serviced for investors at December 31, 2016 and 2015 was $930.8 million and $963.0 million , respectively. Custodial escrow balances maintained in connection with the foregoing loan servicing for investors, and included in demand deposits on the Company's consolidated statements of condition, were $11.9 million and $7.1 million at December 31, 2016 and 2015 , respectively. For the year ended December 31, 2016, 2015 and 2014, the Company served as the primary sub-servicer of loans originated by MSHA. The Company entered into a contract with MSHA to perform loan servicing on the MSHA portfolio for a fee. For the year ended December 31, 2016 , 2015 and 2014 , the Company earned fees of $1.7 million , $ 1.2 million , and $1.2 million , respectively, for the servicing of MSHA loans and was presented within other income on the consolidated statements of income. The MSHA unpaid principal balances of loans serviced by the Company, which are not included in the Company's portfolio loan balance within its consolidated statements of condition, totaled $619.1 million and $612.1 million at December 31, 2016 and 2015 , respectively. Custodial escrow balances maintained in connection with the foregoing loan servicing for MSHA, and included in demand deposits on the consolidated statements of condition, were $6.3 million and $4.3 million at December 31, 2016 and 2015 , respectively. Effective close of business on December 31, 2016, the Company exited its sub-servicer relationship with MSHA and all custodial escrow balances maintained in connection with the MSHA sub-servicing relationship were paid out in January 2017. As part of its agreement to service loans for investors and its own loan portfolio, the Company is required to ensure the good-standing and priority lien position of the collateral for its mortgage loans. In doing so, the Company will advance borrower escrows and incur certain costs that are reimbursable by the borrowers, investors or other means, including mortgage insurance companies and governmental-backed agencies. At December 31, 2016 and 2015, the Company advanced escrow balances of $2.0 million and $4.9 million , respectively, and had a receivable of $2.7 million and $5.7 million , respectively, for the aforementioned services. At December 31, 2016 and 2015, the Company carried an allowance on the aforementioned receivable of $829,000 and $489,000 , respectively. The Company estimated the allowance on its receivable utilizing historical claim and reimbursement information, as well as information through ongoing negotiations with its investors. The Company has presented its advanced escrows and aforementioned net receivable within other assets on the Company's consolidated statements of condition. In addition to fees earned for servicing the portfolios of investors, servicer guides impose certain time-lines for resolving delinquent loans through workout efforts or liquidation and impose compensatory fees on the Company if those deadlines are not satisfied other than for reasons beyond our control. The investors also have a contractual right to demand indemnification or loan repurchase for certain servicing breaches. For example, the Company would be required to indemnify the investors for or against failures by the Company to perform its servicing obligations or acts or omissions that involve willful malfeasance, bad faith or gross negligence in the performance of, or reckless disregard of, its duties. The Company records expenses for servicing-related claims and loan repurchases when it is probable that such claims or repurchases will be made and the amounts are reasonably estimable.

Deposits

Deposits	12 Months Ended
	Dec. 31, 2016
Deposits [Abstract]
Deposits	Deposits The following is a summary of scheduled maturities of CDs as of December 31, 2016 : Retail Brokered Total 2017 $ 230,853 $ 34,939 $ 265,792 2018 89,497 — 89,497 2019 54,453 — 54,453 2020 47,776 7,000 54,776 2021 32,260 — 32,260 Thereafter 13,364 — 13,364 Total $ 468,203 $ 41,939 $ 510,142 CDs issued in amounts that meet or exceed the FDIC insurance limit of $250,000 totaled $104.5 million and $136.6 million at December 31, 2016 and 2015 , respectively. At December 31, 2016 and 2015 , the Company, in the normal course of business, had deposits from certain officers, directors, and their associated companies totaling $14.4 million and $15.7 million , respectively. The amount of overdraft deposits that were reclassified as loans at December 31, 2016 and 2015 was $986,000 and $663,000 , respectively.

Borrowings

Borrowings	12 Months Ended
	Dec. 31, 2016
Debt Disclosure [Abstract]
Borrowings	Borrowings Short-term borrowings consist of customer repurchase agreements, FHLBB advances due in less than 90 days, FHLBB and correspondent bank overnight borrowings, and other short-term borrowings due within one year. The Bank had an available line of credit with the FHLBB of $9.9 million at December 31, 2016 and 2015 . This line of credit serves as overdraft protection should the Company overdraw its account with the FHLBB. The interest rate for this line of credit is set daily by the FHLBB. The Company had no outstanding balance on the line of credit with the FHLBB at December 31, 2016 or 2015 . Long-term borrowings represent securities sold under repurchase agreements with major brokerage firms and notes payable with maturity dates over one year. Both wholesale and retail repurchase agreements are secured by mortgage-backed securities and securities of government sponsored enterprises. At December 31, 2016, the Company has the following lines of credit available to it, for which it had no outstanding balances: • The Company has an unsecured $10.0 million line of credit with PNC Bank that has a maturity date of December 20, 2017 for which the interest rate is LIBOR-based and is set daily by PNC Bank. • The Company, through the Bank, has an unsecured $50.0 million line of credit with PNC Bank for which the interest rate is set daily by PNC Bank. • The Company, through the Bank, has a secured line of credit of $72.3 million through the FRB's Discount Window for which the interest rate is set by the FRB daily. At December 31, 2016, the Bank pledged commercial loans with a carrying value of $115.0 million and investment securities of $73,000 . The following table summarizes short term and long term borrowings as presented on the consolidated statements of condition at: December 31, 2016 2015 Short-Term Borrowings (mature within one year): Customer repurchase agreements $ 225,605 $ 184,989 FHLBB borrowings 210,000 255,000 FHLBB and correspondent bank overnight borrowings 89,450 12,800 Wholesale repurchase agreements 5,007 25,000 Capital lease obligation 67 63 Total short-term borrowings $ 530,129 $ 477,852 Long-Term Borrowings (maturity greater than one year) : FHLBB borrowings $ 10,000 $ 30,000 Capital lease obligation 791 859 Wholesale repurchase agreements — 5,052 Total long-term borrowings $ 10,791 $ 35,911 The table below provides information on the Company's borrowings classified as short-term for the dates indicated: December 31, 2016 2015 Balance outstanding at end of year $ 530,129 $ 477,852 Weighted average interest rate 0.74 % 0.57 % At December 31, 2016, the terms of the Company's outstanding FHLBB borrowings were as follows: Balance Sheet Classification Outstanding Balance Maturity Date Interest Rate Range Next Call Date Call Amount Short-Term Borrowings $ 190,000 January 2017 0.73% - 0.84% N/A — Short-Term Borrowings 20,000 July 2017 3.99% - 4.06% January 2017 $ 20,000 Long-Term Borrowings $ 10,000 April 2020 1.87% N/A — FHLBB borrowings are collateralized by a blanket lien on qualified collateral consisting primarily of loans with first mortgages secured by one- to four-family properties, certain commercial real estate loans, certain pledged investment securities and other qualified assets. The carrying value of residential real estate and commercial loans pledged as collateral was $1.1 billion at December 31, 2016 and 2015 . The carrying value of securities pledged as collateral at the FHLBB was $400,000 and $544,000 at December 31, 2016 and 2015 , respectively. At December 31, 2016 and 2015, the Company had one outstanding wholesale repurchase agreement totaling $5.0 million with a maturity date of March 1, 2017 at an interest rate of 4.67% per annum. There are no remaining call dates prior to maturity. Subordinated Debentures The Company issued $15.0 million of subordinated debt on October 8, 2015, which qualifies as Tier II regulatory capital. The interest rate on the subordinated debt is 5.50% per annum, fixed for the ten -year term and payable semi-annually on April 15 and October 15 each year. The Company can redeem the subordinated debt at par starting on October 15, 2020 plus accrued and unpaid interest, or earlier if (i) they no longer qualify as Tier II capital for regulatory capital purposes; (ii) a change in law that prevents the Company from deducting interest payable for U.S. federal income tax purposes, or (iii) the Company is required to register as an investment company pursuant to the Investment Company Act of 1940. The subordinated debt is schedule to mature on October 15, 2025 . The Company incurred issuance costs of $536,000 associated with this debt issuance. The Company capitalized these costs and they have been presented within subordinated debentures on the consolidated statements of condition. The Company will amortize the issuance costs over the ten -year term of the subordinated debt. The amortization costs incurred for the year ended December 31, 2016 and 2015 associated with the debt issuance were $54,000 and $9,000 , respectively, and was recognized as an increase to interest expense within the consolidated statements of income. In April 2006, the Company formed CCTA, which issued and sold trust preferred securities to the public. The Company received $36.1 million from the issuance of the trust preferred securities in return for junior subordinated debentures issued by the Company to CCTA. The Company owns all of the $1.1 million of outstanding common securities of CCTA. The interest rate of the trust preferred securities was fixed at 6.71% through June 2011 and now floats at the 3 month LIBOR plus 140 basis points . The proceeds from the offering were used to repurchase Company common stock under the tender offer completed in May 2006. The trust preferred securities, which pay interest quarterly at the same rate as the junior subordinated debentures held by CCTA, are mandatorily redeemable on June 30, 2036, or may be redeemed by CCTA at par any time on or after June 30, 2011. In connection with the acquisition of Union Bankshares Company in 2008, the Company assumed $8.0 million of trust preferred securities, held through a Delaware trust affiliate, UBCT. In 2006, Union Bankshares Company issued an aggregate principal amount of $8.2 million of 30 -year junior subordinated deferrable interest debt securities to UBCT. The Company owns all of the $248,000 of outstanding common securities of UBCT. The debt securities obligate the Company to pay interest on their principal sum quarterly in arrears on January 7, April 7, July 7, and October 7 of each year. The interest rate of the trust preferred securities until April 7, 2011 was a blended rate equal to the sum of (1) the product of 50% times the average three-month LIBOR plus 1.42%, plus (2) the product of 50% times 6.4725%. The rate is now the average three-month LIBOR plus 1.42%. The debt securities mature on April 7, 2036, but may be redeemed by the Company, in whole or in part, beginning on April 7, 2011, on any interest payment date. The debt securities may also be redeemed by the Company in whole or in part, within 90 days of the occurrence of certain special redemption events as defined in the Indenture. CCTA and UBCT are Delaware statutory trusts created for the sole purpose of issuing trust preferred securities and investing the proceeds in junior subordinated debentures of the Company. The junior subordinated debentures are the sole assets of the trusts. The Company is the owner of all of the common securities of CCTA and UBCT and fully and unconditionally guarantees each trust’s securities obligations. In accordance with GAAP, CCTA and UBCT are treated as unconsolidated subsidiaries. The common stock investment in the statutory trusts is included in other assets on the consolidated statements of condition. At December 31, 2016 , $43.0 million of the trust preferred securities were included in the Company’s total Tier I capital and amounted to 13.0% of Tier I capital of the Company. The Company has a notional amount of $43.0 million in interest rate swap agreements on its junior subordinated debentures. Further discussion on the terms and accounting for the interest rate swap agreements is included within Note 18 of the consolidated financial statements. Interest expense on the subordinated debentures, including the effective portion of the associated interest rate swaps on these debt instruments reclassified from OCI into earnings, totaled $3.4 million , $2.7 million and $2.5 million for the year ended December 31, 2016 , 2015 and 2014 , respectively. Refer to Note 18 of the consolidated financial statements for information pertaining to the reclassification of OCI into earnings on the interest rate swaps.

Repurchase Agreements (Notes)

Repurchase Agreements (Notes)	12 Months Ended
	Dec. 31, 2016
Banking and Thrift [Abstract]
Repurchase Agreements	. Repurchase Agreements The Company can raise additional liquidity by entering into repurchase agreements at its discretion. In a security repurchase agreement transaction, the Company will generally sell a security, agreeing to repurchase either the same or substantially identical security on a specified later date, at a greater price than the original sales price. The difference between the sale price and purchase price is the cost of the proceeds, which is recorded as interest expense on the consolidated statement of income. The securities underlying the agreements are delivered to counterparties as security for the repurchase obligations. Since the securities are treated as collateral and the agreement does not qualify for a full transfer of effective control, the transactions does not meet the criteria to be classified as a sale, and is therefore considered a secured borrowing transaction for accounting purposes. Payments on such borrowings are interest only until the scheduled repurchase date. In a repurchase agreement the Company is subject to the risk that the purchaser may default at maturity and not return the securities underlying the agreements. In order to minimize this potential risk, the Company either deals with established firms when entering into these transactions or with customers whose agreements stipulate that the securities underlying the agreement are not delivered to the customer and instead are held in segregated safekeeping accounts by the Company's safekeeping agents. The tables below sets forth information regarding the Company’s repurchase agreements accounted for as secured borrowings and types of collateral at December 31, 2016 and 2015 : Remaining Contractual Maturity of the Agreements Overnight and Continuous Up to 30 Days 30 - 90 Days Greater than 90 Days Total December 31, 2016 Customer Repurchase Agreements: Mortgage-backed securities issued or guaranteed by U.S. government-sponsored enterprises $ 117,784 $ — $ — $ — $ 117,784 Collateralized mortgage obligations issued or guaranteed by U.S. government-sponsored enterprises 107,821 — — — 107,821 Total Customer Repurchase Agreements 225,605 — — — 225,605 Wholesale Repurchase Agreements: Mortgage-backed securities issued or guaranteed by U.S. government-sponsored enterprises — — 3,715 — 3,715 Collateralized mortgage obligations issued or guaranteed by U.S. government-sponsored enterprises — — 1,292 — 1,292 Total Wholesale Repurchase Agreements — — 5,007 — 5,007 Total Repurchase Agreements (1) $ 225,605 $ — $ 5,007 $ — $ 230,612 (1) Total repurchase agreements are presented within short-term borrowings on the consolidated statements of condition. Remaining Contractual Maturity of the Agreements Overnight and Continuous Up to 30 Days 30 - 90 Days Greater than 90 Days Total December 31, 2015 Customer Repurchase Agreements: Obligations of states and political subdivisions $ 556 $ — $ — $ — $ 556 Mortgage-backed securities issued or guaranteed by U.S. government-sponsored enterprises 95,967 — — — 95,967 Collateralized mortgage obligations issued or guaranteed by U.S. government-sponsored enterprises 88,466 — — — 88,466 Total Customer Repurchase Agreements 184,989 — — — 184,989 Wholesale Repurchase Agreements: Mortgage-backed securities issued or guaranteed by U.S. government-sponsored enterprises — — — 22,016 22,016 Collateralized mortgage obligations issued or guaranteed by U.S. government-sponsored enterprises — — — 8,036 8,036 Total Wholesale Repurchase Agreements — — — 30,052 30,052 Total Repurchase Agreements (1) $ 184,989 $ — $ — $ 30,052 $ 215,041 (1) Total repurchase agreements are presented within short- and long-term borrowings on the consolidated statements of condition. Certain customers held CDs totaling $917,000 and $914,000 with the Bank at December 31, 2016 and 2015, respectively, that were collateralized by CMO and MBS securities that were overnight repurchase agreements. Certain counterparties monitor collateral, and may request additional collateral to be posted from time to time.

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes The current and deferred components of income tax expense on the consolidated statements of income were as follows: For The Year Ended December 31, 2016 2015 2014 Current: Federal $ 17,854 $ 7,956 $ 11,435 State 930 71 505 18,784 8,027 11,940 Deferred: Federal (1,258 ) 1,356 (500 ) State (54 ) 524 — (1,312 ) 1,880 (500 ) Income tax expense $ 17,472 $ 9,907 $ 11,440 The income tax expense differs from the amount computed by applying the statutory federal income tax rate as a result of the following: For The Year Ended December 31, 2016 2015 2014 Computed tax expense $ 20,139 $ 10,801 $ 12,604 Increase (reduction) in income taxes resulting from: Tax exempt income (1,312 ) (1,092 ) (704 ) Income from life insurance (908 ) (588 ) (503 ) Share-based awards (1) (701 ) — — State taxes, net of federal benefit 565 373 328 Low income housing credits (376 ) (359 ) (286 ) Non-deductible acquisition-related costs — 467 — Other 65 305 1 Income tax expense $ 17,472 $ 9,907 $ 11,440 Income before income taxes $ 57,539 $ 30,859 $ 36,010 Effective tax rate 30.4 % 32.1 % 31.8 % (1) Prior to the adoption of ASU 2016-09, the Company accounted for its windfall tax benefits or shortfalls generated upon exercise of a non-qualified stock option or a disqualifying incentive stock option, or upon vesting of its restricted shares through shareholders' equity (or as income tax expense to the extent the Company did not have a windfall tax benefit surplus). Upon adoption, the Company has accounted for its windfall tax benefits and shortfalls generated within income tax expense on the consolidated statements of income as a discrete period item in the quarter generated. Temporary differences between the financial statements carrying amounts and the tax bases of assets and liabilities gave rise to the following deferred tax assets and liabilities: December 31, 2016 2015 (Calculated using a 35% deferred income tax rate) Asset Liability Asset Liability Net operating loss and tax credit carryforward $ 20,977 $ — $ 22,282 $ — Allowance for loan losses 8,094 — 7,416 — Pension and other benefits 5,141 — 4,488 — Net unrealized losses on AFS securities 3,227 — 2,047 — Net unrealized losses on derivative instruments 3,066 — 3,432 — Purchase accounting and deposit premium 1,430 — 2,856 — Deferred compensation and benefits 1,791 — 2,129 — Net unrealized losses on postretirement plans 1,147 — 1,102 — Depreciation — (4,520 ) — (4,298 ) Deferred loan origination fees — (2,046 ) — (1,815 ) Other 956 — 77 — 45,829 (6,566 ) 45,829 (6,113 ) Valuation allowance on deferred tax assets — — Net deferred tax assets $ 39,263 $ 39,716 In connection with the Merger, the Company acquired certain net operating losses and tax credit carryforwards as of the acquisition date, including federal net operating losses of $71.2 million and State of Maine net operating losses of $213,000 . The Company determined it would not be able to utilize $6.8 million of the acquired federal net operating losses and wrote-off this amount within purchase accounting. Due to Internal Revenue Code of 1986, as amended, Section 382(g) limitations, the Company's use of the federal net operating losses acquired is limited to $3.9 million annually (and $803,000 for fiscal year 2015), which was determined using the applicable federal rate and the fair value of consideration paid for the acquisition at the acquisition date. The acquired federal net operating losses will expire between 2030 and 2034 . The Company has assessed the need for a valuation allowance on the acquired federal net operating losses and determined that there was a high likelihood that it will be able to utilize all of the acquired allowable federal net operating losses prior to expiration as the Company has a history of generating taxable income well in excess of the limitation. As such, there was no valuation allowance established on any of the deferred tax assets acquired as part of the Merger. Income tax returns for the year ended December 31, 2013 through 2015 are open to audit by federal and various state authorities and currently the Company's federal income tax returns for 2013 and 2014 are undergoing an IRS examination. If the Company, as a result of this audit or any future audit, was assessed interest and penalties, the amounts would be recorded within non-interest expense on the consolidated statements of income.

Shareholders' Equity

Shareholders' Equity	12 Months Ended
	Dec. 31, 2016
Stockholders' Equity Note [Abstract]
Shareholders' Equity	Shareholders’ Equity Dividends The primary source of funds available to the Company for the payment of dividends to its shareholders is dividends paid to the Company by its subsidiary, the Bank. The Bank is subject to certain requirements imposed by federal banking laws and regulations. These requirements, among other things, establish minimum levels of capital and restrict the amount of dividends that a bank subsidiary may distribute. Under regulations prescribed by the OCC, without prior OCC approval, a bank subsidiary may not declare dividends in any year in excess of the bank’s (i) net income for the current year, (ii) plus its retained net income for the prior two years. For the year ended December 31, 2016 , 2015 , and 2014, the Bank declared dividends for payment to the Company in the amount of $16.0 million , $39.2 million , which included a $30.0 million special dividend that was paid in connection with the Merger, and $12.8 million , respectively. Prior to Acadia Trust's merger into the Bank effective close of business November 30, 2016, Acadia Trust did no t declare any dividends for payment to the Company for the period January 1, 2016 to November 30, 2016. Furthermore, Acadia Trust had no t declared a dividend to the Company for the year ended December 31, 2015 or 2014. For the year ended December 31, 2016, 2015 and 2014, the Company declared $12.9 million , $10.6 million and $8.3 million , respectively, in dividends payable to its shareholders. Common Stock Split On August 30, 2016, the Company's Board of Directors declared a three -for- two stock split, effected in the form of a stock dividend, on the Company's common stock. Each shareholder of record on September 15, 2016, received one additional share of common stock for every two shares of common stock owned. The stock was issued September 30, 2016. The Company paid shareholders cash in lieu of fractional shares of common stock in connection with the split, at a price of $31.75 per share, the closing price of the Company’s common stock on September 14, 2016. The total cash paid for fractional shares was $5,000 , and was accounted for as a reduction of capital stock. Common Stock Repurchase (adjusted for the three-for-two common stock split) On September 24, 2013, the Board of Directors authorized the 2013 Repurchase Plan. The 2013 Repurchase Plan allows for the repurchase of up to 375,000 shares of the Company’s outstanding common stock. This program is expected to continue until the authorized number of shares is repurchased, or the Company’s board terminates the program. As of December 31, 2016 , the Company had repurchased 374,250 shares at a weighted-average price of $ 26.55 , or 99.8% of the program’s total allotment, and 2.4% of total outstanding shares.

Earnings per Share

Earnings per Share	12 Months Ended
	Dec. 31, 2016
Earnings Per Share [Abstract]
Earnings per Share	EPS The following is an analysis of basic and diluted EPS, reflecting the application of the two-class method, as described below: For The Year Ended December 31, 2016 2015 2014 Net income $ 40,067 $ 20,952 $ 24,570 Dividends and undistributed earnings allocated to participating securities (1) (189 ) (59 ) (75 ) Net income available to common shareholders $ 39,878 $ 20,893 $ 24,495 Weighted-average common shares outstanding for basic EPS (2) 15,422,160 12,031,294 11,176,468 Dilutive effect of stock-based awards (2)(3) 82,079 43,285 29,420 Weighted-average common and potential common shares for diluted EPS (2) 15,504,239 12,074,579 11,205,888 Earnings per common share (2) : Basic EPS $ 2.59 $ 1.73 $ 2.19 Diluted EPS $ 2.57 $ 1.73 $ 2.19 Awards excluded from the calculation of diluted EPS (2) (4) : Stock options — 19,875 20,625 (1) Represents dividends paid and undistributed earnings allocated to nonvested stock-based awards that contain non-forfeitable rights to dividends. (2) Share and per share amounts have been adjusted to reflect the three-for-two split effective September 30, 2016, for all periods presented. Refer to Note 13. (3) Represents the effect of the assumed exercise of stock options, vesting of restricted shares, vesting of restricted stock units, and vesting of LTIP awards that have met the performance criteria, utilizing the treasury stock method. (4) Represents stock-based awards not included in the computation of potential common shares for purposes of calculating diluted EPS as the exercise prices were greater than the average market price of the Company's common stock, and, therefore, are considered anti-dilutive. Nonvested stock-based payment awards that contain non-forfeitable rights to dividends are participating securities and are included in the computation of EPS pursuant to the two-class method. The two-class method is an earnings allocation formula that determines EPS for each class of common stock and participating security according to dividends declared (or accumulated) and participation rights in undistributed earnings. Certain of the Company’s nonvested stock-based awards qualify as participating securities. Net income is allocated between the common stock and participating securities pursuant to the two-class method. Basic EPS is computed by dividing net income available to common shareholders by the weighted average number of common shares outstanding during the period, excluding participating nonvested stock-based awards. Diluted EPS is computed in a similar manner, except that the denominator includes the number of additional common shares that would have been outstanding if potentially dilutive common shares were issued using the treasury stock method.

Employee Benefit Plans

Employee Benefit Plans	12 Months Ended
	Dec. 31, 2016
Compensation and Retirement Disclosure [Abstract]
Employee Benefit Plans	Employee Benefit Plans 401(k)/Profit Sharing Plan The Company has a 401(k)/profit sharing plan and the majority of employees participate in the plan. Employees may contribute pre-tax contributions to the 401(k)/profit sharing plan up to the maximum amount allowed by federal tax laws. The Company makes matching contributions of up to 4% of an employee’s eligible compensation. The Company may make additional matching contributions subject to the discretion of the Board of Directors. For the year ended December 31, 2016 , 2015 and 2014 , these contributions amounted to 3% of pre-tax compensation. For the year ended December 31, 2016 , 2015 and 2014 , expenses under the 401(k)/Profit Sharing plan amounted to $2.2 million , $1.5 million , and $1.4 million , respectively. SERP and Other Postretirement Benefit Plan The Company sponsors unfunded, non-qualified SERPs for certain officers. These agreements are designed to make up the shortfall (when compared to a non-highly compensated employee) in replacing income at retirement due to IRS compensation and benefit limits under the 401(k) plan and Social Security. With a SERP in place, participants should be able to replace 65 – 75% of their final average compensation. For those eligible for benefits, the SERP provides for a minimum 15 -year guaranteed benefit for all vested participants. In addition, the Company provides medical and life insurance to certain eligible retired employees under the other postretirement benefit plan. The following table summarizes changes in the benefit obligation and plan assets for (i) SERP and (ii) the other postretirement benefit plan as of December 31, 2016 and 2015 : SERP Other Postretirement Benefits 2016 2015 2016 2015 Benefit obligations: Beginning of year $ 11,052 $ 10,834 $ 3,447 $ 2,997 Service cost 308 307 59 62 Interest cost 432 424 151 117 Actuarial (gain) loss 219 (32 ) 143 92 Business combinations (1) — — — 312 Benefits paid (488 ) (481 ) (165 ) (133 ) End of year 11,523 11,052 3,635 3,447 Fair value of plan assets: Beginning of year — — — — Employer contributions 488 481 165 133 Benefits paid (488 ) (481 ) (165 ) (133 ) End of year — — — — Funded status at end of year (2) $ 11,523 $ 11,052 $ 3,635 $ 3,447 Amounts recognized in AOCI, net of tax: Net actuarial loss $ 1,791 $ 1,789 $ 495 $ 423 Prior service cost (credit) — 5 (156 ) (170 ) Total $ 1,791 $ 1,794 $ 339 $ 253 (1) In connection with the Merger, the Company assumed its post-retirement benefits for certain former employees and their spouses whereby the Company will cover 100% of healthcare premiums. (2) Reported within other liabilities on the consolidated statements of condition. The accumulated benefit obligation for the SERP was $8.5 million at December 31, 2016 and 2015 . In 2017 , approximately $247,000 in net actuarial losses and no prior service costs, are expected to be recognized as components of net period benefit cost for the SERP, and approximately $41,000 and $24,000 in net actuarial losses and prior service credits, respectively, are expected to be recognized for the other postretirement benefit plan. The components of net period benefit cost and other amounts recognized in OCI, before taxes, were as follows: SERP Other Postretirement Benefits 2016 2015 2014 2016 2015 2014 Net period benefit cost: Service cost $ 308 $ 307 $ 270 $ 59 $ 62 $ 45 Interest cost 432 424 456 151 117 132 Recognized net actuarial loss 220 218 140 30 24 10 Amortization of prior service cost (credit) 7 19 19 (22 ) (22 ) (22 ) Net period benefit cost 967 968 885 218 181 165 Changes in funded status recognized in OCI, before taxes: Net actuarial (gain) loss 219 (32 ) 777 143 92 (134 ) Reclassifications to net period benefit cost: Amortization of net unrecognized actuarial loss (220 ) (218 ) (140 ) (30 ) (24 ) (10 ) Amortization of prior service (cost) credit (7 ) (19 ) (19 ) 22 22 22 Total recognized in OCI, before taxes (8 ) (269 ) 618 135 90 (122 ) Total recognized in net period benefit cost and OCI, before taxes $ 959 $ 699 $ 1,503 $ 353 $ 271 $ 43 In the first quarter of 2014, the Company amended the terms of its other postretirement benefit plan impacting the eligibility of employees. The amendment to the plan reduced the Company's benefit obligation by $308,000 at December 31, 2014 and is reflected within the year ended December 31, 2014 other postretirement benefits plan net actuarial gain. The following assumptions were used in determining benefit obligations and net period benefit costs: SERP Other Postretirement Benefits 2016 2015 2014 2016 2015 2014 Weighted-average assumptions as of end of year: Discount rate for benefit obligation 4.00 % 4.00 % 4.00 % 4.00 % 4.50 % 4.00 % Discount rate for net period benefit cost 4.00 % 4.00 % 4.75 % 4.50 % 4.00 % 5.02 % Rate of compensation increase for benefit obligation 4.00 % 4.00 % 4.00 % — — — Rate of compensation increase for net periodic benefit cost 4.00 % 4.00 % 4.50 % — — — Health care cost trend rate assumed for future years — — — 7.00 % 7.00 % 7.00 % A 1.0% increase or decrease in the assumed health care cost trend rate would not materially increase or decrease the Company's accumulated postretirement benefit obligation and the related service and interest cost at December 31, 2016 . The postretirement plan has a built-in cap on annual benefits to participants and, thus, the accumulated postretirement benefit obligation and the assumed health care cost trend are relatively stable each period. In 2017, the expected contribution is $475,000 for the SERP and $156,000 for the other postretirement benefits plan. The expected benefit payments for the next ten years are presented in the following table: SERP Other Postretirement Benefits 2017 475 156 2018 473 163 2019 477 166 2020 486 169 2021 542 182 2022-2026 3,127 1,043

Stock-Based Compensation Plans

Stock-Based Compensation Plans	12 Months Ended
	Dec. 31, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock-Based Compensation Plans	Stock-Based Compensation Plans Stock-Based Compensation On April 29, 2003 and May 1, 2012, the shareholders of the Company approved the 2003 Plan and 2012 Plan, respectively. The maximum number of shares of stock reserved and available for issuance under each the 2003 Plan and 2012 Plan is 1.2 million shares. Awards may be granted in the form of incentive stock options, non-qualified stock options, stock appreciation rights, restricted stock, restricted stock units, unrestricted stock, performance shares and dividend equivalent rights, or any combination of the preceding, and the exercise price shall not be less than 100% of the fair market value on the date of grant in the case of incentive stock options, or 85% of the fair market value on the date of grant in the case of non-qualified stock options. No stock options are exercisable more than ten years after the date the stock option is granted. The exercise price of all options granted equaled the market price of the Company's stock on the date of grant, except for the non-qualified stock options issued in conjunction with the Merger. Refer to Note 2 for additional details. Stock Option Awards Stock options granted under the 2003 Plan and the 2012 Plan have been both incentive stock options and non-qualified stock options. All incentive stock options and non-qualified stock options granted vest pro rata over a five year period and have a contractual life of ten years. On the date of each grant, the fair value of each award is derived using the Black-Scholes option pricing model based on assumptions made by the Company as follows: • Dividend yield is based on the dividend rate of the Company’s stock at the date of grant. • Risk-free interest rate is based on the U.S. Treasury bond rate with a term equaling the expected life of the granted options. • Expected volatility is based on the historical volatility of the Company’s stock price calculated over the expected life of the option. • Expected life represents the period of time that granted options are expected to be outstanding based on historical trends. The following table presents the option pricing assumptions and the estimated fair value of the options using these assumptions for grants made for the year ended: December 31, 2016 2015 2014 Weighted-average dividend yield 3.12 % 3.01 % 2.90 % Weighted-average risk-free interest rate 1.52 % 1.50 % 1.65 % Weighted-average expected volatility 29.64 % 31.85 % 35.39 % Weighted-average expected life (in years) 5.3 5.3 5.3 Weighted-average fair value of options granted $ 5.17 $ 5.87 $ 5.95 Compensation expense is recognized on a straight-line basis over the option vesting period. For the year ended December 31, 2016, 2015 and 2014, the Company issued only incentive stock options and the associated compensation expense recognized was $30,000 , $51,000 and $81,000 , respectively. The Company does not receive any tax benefit on its issuance of incentive stock options, unless upon exercise a disqualifying disposition is made. The total tax benefit to the Company upon exercise of incentive stock options for the year ended December 31, 2016 , 2015 and 2014 was $36,000 , $59,000 , and $19,000 , respectively. Additionally, for the year ended December 31, 2016, the Company received a tax benefit upon the exercise of non-qualified stock options that were issued as consideration in the Merger of $378,000 . Unrecognized compensation expense for nonvested stock options totaled $48,000 at December 31, 2016 . Effective January 1, 2016, the Company early adopted ASU 2016-09 and made a policy election to not apply a forfeiture rate to account for its share-based compensation expense. This accounting policy change was applied retrospectively, the cumulative-effect of such adjustment for prior periods totaled $72,000 and was recorded within shareholders' equity for the year ended December 31, 2016. Unrecognized compensation expense on stock options is expected to be recognized over the remaining weighted-average vesting period of 3.1 years. The total intrinsic value of options exercised for the year ended December 31, 2016 , 2015 and 2014 was $2.5 million , $573,000 , and $134,000 , respectively. Stock option activity for the year ended December 31, 2016 is as follows: Number of Shares (1) Weighted-Average Exercise Price Weighted-Average Remaining Contractual Term Aggregate Intrinsic Value Options outstanding at January 1, 2016 219,399 $ 16.93 Granted 3,000 25.64 Exercised (157,956 ) 15.53 Forfeited and expired (5,700 ) 22.93 Options outstanding at December 31, 2016 58,743 $ 20.38 3.82 $ 1,558 Options exercisable at December 31, 2016 49,293 $ 19.62 3.91 $ 1,224 (1) Options outstanding at January 1, 2016 included 118,299 of non-qualified stock options issued in conjunction with the Merger. Of these, 109,356 were exercised during 2016. At December 31, 2016, 8,943 non-qualified stock options issued in conjunction with the Merger were outstanding and exercisable. A summary of the status of the Company’s nonvested stock options as of December 31, 2016 and changes during the year then ended is presented below: Awards Weighted-Average Grant Date Fair Value Nonvested at January 1, 2016 17,351 $ 7.40 Granted 3,000 5.17 Vested (7,751 ) 8.13 Forfeited (3,150 ) 5.92 Nonvested at December 31, 2016 9,450 $ 6.59 For the year ended December 31, 2016 and 2015 , the Company received cash from the exercise of stock options of $1.3 million and $736,000 , respectively. Restricted Stock, Restricted Stock Units and MSPP The Company issued restricted stock awards to certain executives, directors, and employees. Restricted stock awards are issued to certain employees and vest pro-rata over the requisite service period, which is typically three or five years, and may contain certain performance-based conditions. The vesting period for restricted stock awards issued to directors under the Independent Directors' Equity Compensation Program is determined when granted. Restricted stock awards issued to directors and employees participate in dividends and recipients are entitled to vote these restricted shares during the vesting period. The Company issued restricted stock units to certain Company directors who make a valid election to defer under the Independent Directors' Equity Compensation Program, a component of the 2012 Plan. These units are deferred and have no voting or dividend rights until termination or retirement, at which time shares will be issued based on the grant date fair value of the awards issued. The vesting period for these awards is determined when granted. The Company did not issue restricted stock units to directors under the Independent Directors' Equity Compensation Program for the year ended December 31, 2016 . The Company offers the MSPP to provide an opportunity for certain executives and employees to receive restricted shares of the Company’s common stock in lieu of their annual incentive bonus. Restricted shares issued under the MSPP are granted at a discount of one-third of the fair market value of the stock on the date of grant and cliff vests two years after the grant date. Restricted stock issued under the MSPP to executives and employees participate in dividends and are entitled to vote these restricted shares during the vesting period. Compensation expense recognized in connection with the restricted stock units, restricted stock awards, and MSPP is presented in the following table: For The Year Ended 2016 2015 2014 Restricted stock and restricted stock units $ 703 $ 327 $ 254 MSPP 102 66 67 Total compensation expense $ 805 $ 393 $ 321 Related income tax benefit $ 282 $ 137 $ 112 Fair value of grants vested $ 660 $ 433 $ 332 The following table presents a summary of the activity related to restricted stock, restricted stock units and MSPP for the period indicated: Restricted Stock and Restricted Stock Units MSPP Number of Shares Weighted-Average Grant Date Fair Value Number of Shares Weighted-Average Grant Date Fair Value Nonvested at January 1, 2016 38,391 $ 27.09 18,800 $ 7.85 Granted 32,016 28.88 16,000 8.02 Vested (22,000 ) 27.40 (6,988 ) 8.21 Forfeited (894 ) 26.55 (1,113 ) 8.10 Nonvested at December 31, 2016 47,513 $ 28.16 26,699 $ 7.85 At December 31, 2016 , unrecognized compensation cost related to nonvested restricted stock awards and MSPP was $1.1 million , which is expected to be recognized over a weighted-average period of 2.6 years. LTIP The LTIP is intended to attract and retain executives who will contribute to the Company’s future success. The long-term performance period is a period of three consecutive years beginning on January 1 of the first year and ending on December 31 of the third year. Awards are based upon either: (i) the attainment of certain performance targets on specific performance measures selected by the Compensation Committee and approved by the Board of Directors; or (ii) 50% weighted on the attainment of certain performance targets on specific performance measures selected by the Compensation Committee and approved by the Board of Directors and 50% weighted on meeting the requisite service period. The performance-based share units granted will vest only if specific performance measures, as defined under the LTIP, are achieved. Failure to achieve the specific performance measures will result in all or a portion of the shares being forfeited. The service-based share units granted vest annually pro-rata over the three year period. Compensation expense recognized in connection with the LTIP is presented in the following table: For The Year Ended 2016 2015 2014 Compensation expense (1) $ 1,080 $ 330 $ 151 Related income tax benefit $ 378 $ 116 $ 53 Fair value of grants vested $ 725 $ 412 $ — (1) For the year ended December 31, 2016, $84,000 of compensation expense associated with the LTIP for the plan year January 1, 2016 to December 31, 2018 was accounted for within total compensation expense for restricted stock and restricted stock units above as this plan contains both performance- and service-based conditions. The following table presents a summary of the activity related to LTIP for the period indicated: Number of Shares Weighted-Average Grant Date Fair Value Nonvested at January 1, 2016 64,165 $ 26.71 Granted 17,385 28.87 Vested (26,396 ) 27.45 Forfeited (2,417 ) 27.45 Nonvested at December 31, 2016 52,737 $ 27.01 Based on current performance levels, unrecognized stock compensation expense for the performance share awards was $417,000 with a weighted-average remaining amortization period of 1.4 years at December 31, 2016 . DCRP The DCRP is an unfunded deferred compensation plan for the benefit of certain Company executives. The Company’s Compensation Committee determines eligibility in the DCRP and annually, participants will receive a credit to an account administered by the Company of 10% of each participant’s annual base salary and bonus for the prior performance period. Annual credits to a participant’s account will be denominated in deferred stock awards (the right to receive a share of common stock of the Company upon the satisfaction of certain restrictions) based on the fair market value of the common stock of the Company on the date of grant. Vesting occurs ratably from the date of participation until the participant reaches the age of 65, at which time the participant is 100% vested. Upon retirement or termination of employment, the participant will receive shares of common stock equal to the Deferred Stock Awards in the account multiplied by the vested percentage, reduced by the amount to be withheld for income taxes. The Company granted 4,094 , 3,609 , and 3,030 of deferred stock awards for the years ended December 31, 2016 , 2015 and 2014 , respectively under the DCRP. Compensation expense totaled $81,000 , $62,000 , and $46,000 for the years ended December 31, 2016 , 2015 and 2014 , respectively. Unrecognized stock compensation expense for the deferred stock awards was $308,000 with a weighted-average remaining amortization period of 10.4 years at December 31, 2016 .

Other Non-Interest Expenses

Other Non-Interest Expenses	12 Months Ended
	Dec. 31, 2016
Other Noninterest Expenses [Abstract]
Other Non-Interest Expenses	Detail of other income included in the consolidated statements of income is as follows: For The Year Ended December 31, 2016 2015 2014 Customer loan swap fee income (1) $ 2,104 $ 1,514 $ 480 Other income 4,830 2,363 2,600 Total $ 6,934 $ 3,877 $ 3,080 Other Non-Interest Income and Expenses Detail of other income included in the consolidated statements of income is as follows: For The Year Ended December 31, 2016 2015 2014 Customer loan swap fee income (1) $ 2,104 $ 1,514 $ 480 Other income 4,830 2,363 2,600 Total $ 6,934 $ 3,877 $ 3,080 (1) Fee income recognized upon completion of customer loan swaps. Refer to Note 18 for further discussion. Detail of other expenses included in the consolidated statements of income is as follows: For The Year Ended December 31, 2016 2015 2014 Postage, freight, and courier $ 1,754 $ 1,430 $ 1,236 Donations and marketing 1,660 1,841 1,587 Employee-related costs (1) 1,616 1,437 1,287 Other expenses 5,657 4,502 3,735 Total $ 10,687 $ 9,210 $ 7,845 (1) Employee-related costs include hiring, training, education, meeting and business travel costs.

Commitments And Contingencies

Commitments And Contingencies	12 Months Ended
	Dec. 31, 2016
Commitments and Contingencies Disclosure [Abstract]
Commitments And Contingencies	Commitments, Contingencies and Derivatives Legal Contingencies In the normal course of business, the Company and its subsidiaries are subject to pending and threatened legal actions. Although the Company is not able to predict the outcome of such actions, after reviewing pending and threatened actions with counsel, management believes that based on the information currently available the outcome of such actions, individually or in the aggregate, will not have a material adverse effect on the Company’s consolidated financial position as a whole. Reserves are established for legal claims only when losses associated with the claims are judged to be probable, and the loss can be reasonably estimated. In many lawsuits and arbitrations, it is not possible to determine whether a liability has been incurred or to estimate the ultimate or minimum amount of that liability until the case is close to resolution, in which case a reserve will not be recognized until that time. As of December 31, 2016 and 2015 , the Company did no t have any material loss contingencies that were provided for and/or disclosure was necessary. Financial Instruments In the normal course of business, the Company is a party to both on- and off-balance sheet financial instruments involving, to varying degrees, elements of credit risk and interest rate risk in addition to the amounts recognized in the consolidated statements of condition. The following is a summary of the contractual and notional amounts of the Company’s financial instruments: December 31, 2016 2015 Lending-Related Instruments: Loan origination commitments and unadvanced lines of credit: Home equity $ 454,225 $ 464,701 Commercial and commercial real estate 83,103 94,791 Residential 17,795 16,256 Letters of credit 2,580 4,468 Other commitments 432 433 Derivative Financial Instruments: Customer loan swaps 532,526 285,888 FHLBB advance interest rate swaps 50,000 50,000 Junior subordinated debt interest rate swaps 43,000 43,000 Interest rate lock commitments 15,249 20,735 Forward delivery commitments 15,125 — Lending-Related Instruments The contractual amounts of the Company’s lending-related financial instruments do not necessarily represent future cash requirements since certain of these instruments may expire without being funded and others may not be fully drawn upon. These instruments are subject to the Company’s credit approval process, including an evaluation of the customer’s creditworthiness and related collateral requirements. Commitments generally have fixed expiration dates or other termination clauses. Derivative Financial Instruments The Company uses derivative financial instruments for risk management purposes (primarily interest rate risk) and not for trading or speculative purposes. The Company controls the credit risk of these instruments through collateral, credit approvals and monitoring procedures. Additionally, as part of Company's normal mortgage origination process, it provides the borrower with the option to lock their interest rate based on current market prices. During the period from commitment date to the loan closing date, the Company is subject to the risk of interest rate change. In an effort to mitigate such risk the Company may enter into forward delivery commitments, typically on a "best-efforts" basis, with certain approved investors. The Company accounts for its interest rate lock commitments on loans within the normal origination process for which it intends to sell as a derivative instrument. Furthermore, the Company records a derivative for its "best-effort" forward delivery commitments upon origination of a loan identified as held for sale. Should the Company enter into a forward delivery commitment on a mandatory delivery arrangement with an investor it accounts for the forward delivery commitment upon execution of the contract. Derivative instruments are carried at fair value in the Company’s financial statements. The accounting for changes in the fair value of a derivative instrument is dependent upon whether or not it qualifies and has been designated as a hedge for accounting purposes, and further, by the type of hedging relationship. The Company has designated its interest rate swaps on its junior subordinated debentures and its interest rate swaps on forecasted 30-day FHLBB borrowings as cash flow hedges. The change in the fair value of the Company's cash flow hedges is accounted for within OCI, net of tax. Quarterly, in conjunction with financial reporting, the Company assesses each cash flow hedge for ineffectiveness. To the extent any significant ineffectiveness is identified, this amount is recorded within the consolidated statements of income. Furthermore, the Company will reclassify the gain or loss on the effective portion of the cash flow hedge from OCI into interest within the consolidated statements of income in the period the hedged transaction affects earnings. The change in fair value of the Company's other derivative instruments, not designated and qualifying as hedges, are accounted for within the consolidated statements of income. Junior Subordinated Debt Interest Rate Swaps: The Company, from time to time, will enter into an interest rate swap agreement with a counterparty to manage interest rate risk associated with its variable rate borrowings. The Company has entered into a master netting arrangement with its counterparty and settles payments with the counterparty quarterly on a net basis. The interest rate swap agreements contain provisions that require the Company to post cash collateral with the counterparty for contracts that are in a net liability position based on their fair values and the Company’s credit rating. If the interest rate swaps are in a net asset position based on their fair value, the counterparty is required to post cash collateral to the Company. The collateral posted by the Company was not readily available and has been presented within cash and due from banks on the consolidated statements of condition. At December 31, 2016 and 2015 , the Company had a notional amount of $43.0 million in variable-for-fixed interest rate swap agreements on its junior subordinated debentures and posted $9.7 million of cash as collateral at December 31, 2016 . The details of its interest rate swap agreements are outlined in the table below: December 31, 2016 2015 Notional Amount Trade Date Maturity Date Variable Index Received Fixed Rate Paid Fair Value (1) Fair Value (1) $ 10,000 3/18/2009 6/30/2021 3-Month USD LIBOR 5.09% $ (806 ) $ (1,038 ) 10,000 7/8/2009 6/30/2029 3-Month USD LIBOR 5.84% (2,321 ) (2,537 ) 10,000 5/6/2010 6/30/2030 3-Month USD LIBOR 5.71% (2,290 ) (2,477 ) 5,000 3/14/2011 3/30/2031 3-Month USD LIBOR 4.35% (1,211 ) (1,301 ) 8,000 5/4/2011 7/7/2031 3-Month USD LIBOR 4.14% (1,744 ) (1,876 ) $ 43,000 $ (8,372 ) $ (9,229 ) (1) Presented within accrued interest and other liabilities on the consolidated statements of condition. For the years ended December 31, 2016 , 2015 or 2014 , the Company did no t record any ineffectiveness on these cash flow hedges within the consolidated statements of income. Net payments to the counterparty for the year ended December 31, 2016 and 2015 were $1.5 million and $1.7 million , respectively, and have been classified as cash flows from operating activities in the consolidated statements of cash flows. FHLBB Advance Interest Rate Swaps: The Bank has two interest rate swap arrangements with a counterparty on two tranches of 30-day FHLBB advances with a total notional amount of $50.0 million . Each derivative arrangement commenced on February 25, 2016, with one contract set to expire on February 25, 2018 and the other on February 25, 2019. The Bank entered into these interest rate swaps to mitigate its interest rate exposure on borrowings in a rising interest rate environment. The Bank has designated each arrangement as a cash flow hedge in accordance with GAAP, and, therefore, the change in unrealized gains or losses on the derivative instruments is recorded within AOCI, net of tax. Also, quarterly, in conjunction with financial reporting, the Company assesses each derivative instrument for ineffectiveness. To the extent any significant ineffectiveness is identified this amount would be recorded within the consolidated statements of income. For the year ended December 31, 2016, the Company did no t record any ineffectiveness on these cash flow hedges within the consolidated statements of income. The Bank has entered into a master netting arrangement with its counterparty and settles payments with the counterparty quarterly on a net basis. The Bank's arrangement with the counterparty requires it to post cash collateral for contracts in a net liability position based on their fair values and the Bank's credit rating. If the interest rate swaps are in a net asset position based on their fair value, the counterparty is required to post collateral to the Company. The collateral posted by the Company (or counterparty) is not readily available and is presented within cash and due from banks on the consolidated statements of condition. At December 31, 2016, the Bank posted cash collateral to the counterparty of $474,000 . The details of the interest rate swap agreements are as follows: December 31, 2016 2015 Notional Trade Maturity Date Variable Index Fixed Rate Fair Value (1) Fair Value (1) $ 25,000 2/25/2015 2/25/2018 1-Month USD LIBOR 1.54% $ (152 ) $ (230 ) 25,000 2/25/2015 2/25/2019 1-Month USD LIBOR 1.74% (237 ) (346 ) $ 50,000 $ (389 ) $ (576 ) (1) Presented within accrued interest and other liabilities on the consolidated statements of condition. Net payments to the counterparty for the year ended December 31, 2016 were $490,000 and have been classified as cash flows from operating activities in the consolidated statements of cash flows. Customer Loan Swaps The Bank will enter into interest rate swaps with its commercial customers, from time to time, to provide them with a means to lock into a long-term fixed rate, while simultaneously the Bank enters into an arrangement with a counterparty to swap the fixed rate to a variable rate to allow it to effectively manage its interest rate exposure. The Bank's customer loan level derivative program is not designated as a hedge for accounting purposes. As the interest rate swap agreements have substantially equivalent and offsetting terms, they do not materially change the Bank's interest rate risk or present any material exposure to the Company's consolidated statements of income. The Company records its customer loan swaps at fair value and presents such on a gross basis within other assets and accrued interest and other liabilities on the consolidated statements of condition. The following table presents the total positions, notional and fair value of the Bank's customer loans swaps with its commercial customers and the corresponding interest rate swap agreements with counterparty for the periods indicated: December 31, 2016 2015 Balance Sheet Location Number of Positions Notional Fair Value Number of Positions Notional Fair Value Receive fixed, pay variable Other assets / (accrued interest and other liabilities) 50 $ 266,263 $ (1,945 ) 28 $ 142,944 $ 3,166 Pay fixed, received variable Other assets / (accrued interest and other liabilities) 50 266,263 1,945 28 142,944 (3,166 ) Total 100 $ 532,526 $ — 56 $ 285,888 $ — The Bank seeks to mitigate its customer counterparty credit risk exposure through its loan policy and underwriting process, which includes credit approval limits, monitoring procedures, and obtaining collateral, where appropriate. The Bank seeks to mitigate its institutional counterparty credit risk exposure by limiting the institutions for which it will enter into interest swap arrangements through an approved listing by the Company's Board of Directors. The Company has entered into a master netting arrangement with its counterparty and settles payments with the counterparty quarterly on a net basis. The Bank's arrangement with an institutional counterparty requires it to post cash collateral for contracts in a net liability position based on their fair values and the Bank's credit rating or receive cash collateral for contracts in a net asset position. At December 31, 2016 , the Company did no t have any cash posted as collateral with the counterparty. Interest Rate Locks Commitments: As part of the origination process of a residential loan, the Company may enter into rate lock agreement with its borrower, which is considered an interest rate lock commitment. If the Company has the intention to sell the loan upon origination, it will account for the interest rate lock commitment as a derivative. Our pipeline of mortgage loans with fixed-rate interest rate lock commitments were as follows for the periods indicated: December 31, 2016 2015 Balance Sheet Location Notional Fair Value Notional Fair Value Fixed-rate mortgage interest rate locks Other assets $ 12,310 $ 202 $ 12,669 $ 229 Fixed-rate mortgage interest rate locks Accrued interest and other liabilities 2,939 (15 ) 8,066 (90 ) Total $ 15,249 $ 187 $ 20,735 $ 139 For the year ended December 31, 2016, 2015 and 2014, the unrealized gains from the change in fair value on the Company's fixed-rate mortgage interest rate locks reported within mortgage banking income, net, on the consolidated statements of income were $48,000 , $139,000 , and $0 , respectively. Forward Delivery Commitments: The Company typically enters into a forward delivery commitment with a secondary market investor, which has been approved by the Company within its normal governance process, at the onset of the loan origination process. The Company may enter into these arrangements with the secondary market investors on a "best effort" or "mandatory delivery" basis. The Company's normal practice is to typically enter into these arrangements on a "best effort" basis. The Company enters into these arrangements with the secondary market investors to manage its interest rate exposure. The Company accounts for the forward delivery commitment as a derivative (but does not designate as a hedge) upon origination of a loan for which it intends to sell. The Company's forward delivery commitments on loans held for sale was as follows for the periods indicated: December 31, 2016 2015 Balance Sheet Location Notional Fair Value Notional Fair Value Forward delivery commitments ("best-effort") Other assets $ 14,250 $ 587 $ — $ — Forward delivery commitments ("best-effort") Accrued interest and other liabilities 875 (309 ) — — Total $ 15,125 $ 278 $ — $ — For the year ended December 31, 2016, 2015 and 2014, the unrealized gains from the change in fair value on the Company's forward delivery commitments reported within mortgage banking income, net on the consolidated statements of income were $278,000 , $0 , and $0 , respectively. The table below presents the effect of the Company’s derivative financial instruments included in OCI and current earnings for the periods indicated: For The Year Ended 2016 2015 2014 Derivatives designated as cash flow hedges Effective portion of unrealized losses recognized within AOCI during the period, net of tax $ (637 ) $ (1,533 ) $ (4,515 ) Net reclassification adjustment for effective portion of cash flow hedges included in interest expense, gross (1) $ 2,026 $ 1,695 $ 1,714 (1) Reclassified into the consolidated statements of income within interest on subordinated debentures. The Company expects approximately $1.6 million (pre-tax) to be reclassified to interest expense from OCI, related to the Company’s cash flow hedges, in the next twelve months. This reclassification is due to anticipated payments that will be made and/or received on the swaps based upon the forward curve as of December 31, 2016 .

Fair Value

Fair Value	12 Months Ended
	Dec. 31, 2016
Fair Value Disclosures [Abstract]
Fair Value	Fair Value Fair value is the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. Fair value is best determined using quoted market prices. However, in many instances, quoted market prices are not available. In such instances, fair values are determined using various valuation techniques. Various assumptions and observable inputs must be relied upon in applying these techniques. GAAP establishes a fair value hierarchy for valuation inputs that gives the highest priority to quoted prices in active markets for identical assets or liabilities and the lowest priority to unobservable inputs. GAAP permits an entity to choose to measure certain eligible financial instruments and other items at fair value. The Company elected the fair value option for its loans held for sale. Electing the fair value option for loans held for sale enables the Company’s financial position to more clearly align with the economic value of the actively traded asset. The fair value hierarchy for valuation of an asset or liability is as follows: Level 1: Valuation is based upon unadjusted quoted prices in active markets for identical assets and liabilities that the entity has the ability to access as of the measurement date. Level 2: Valuation is determined from quoted prices for similar assets or liabilities in active markets, from quoted prices for identical or similar instruments in markets that are not active or by model-based techniques in which all significant inputs are observable in the market. Level 3: Valuation is derived from model-based and other techniques in which at least one significant input is unobservable and which may be based on the Company’s own estimates about the assumptions that market participants would use to value the asset or liability. In general, fair value is based upon quoted market prices, where available. If such quoted market prices are not available, fair value is based upon model-based techniques incorporating various assumptions including interest rates, prepayment speeds and credit losses. Assets and liabilities valued using model-based techniques are classified as either Level 2 or Level 3, depending on the lowest level classification of an input that is considered significant to the overall valuation. A description of the valuation methodologies used for instruments measured at fair value, as well as the general classification of such instruments pursuant to the valuation hierarchy, is set forth below. Financial Instruments Recorded at Fair Value on a Recurring Basis Loans Held For Sale: The fair value of loans held for sale is determined using quoted secondary market prices or executed sales agreements and is classified as Level 2. AFS Securities : The fair value of debt AFS securities is reported utilizing prices provided by an independent pricing service based on recent trading activity and other observable information including, but not limited to, dealer quotes, market spreads, cash flows, market interest rate curves, market consensus prepayment speeds, credit information, and the bond’s terms and conditions. The fair value of debt securities are classified as Level 2. The fair value of equity AFS securities is reported utilizing market prices based on recent trading activity. The equity securities are traded on inactive markets and are classified as Level 2. Derivatives : The fair value of the Company's interest rate swaps, including its junior subordinated debt interest rate swaps, FHLBB advance interest rate swaps and customer loan swaps, are determined using inputs that are observable in the market place obtained from third parties including yield curves, publicly available volatilities, and floating indexes and, accordingly, are classified as Level 2 inputs. The credit value adjustments associated with derivatives utilize Level 3 inputs, such as estimates of current credit spreads to evaluate the likelihood of default by the Company and its counterparties. As of December 31, 2016 and 2015 , the Company has assessed the significance of the impact of the credit valuation adjustments on the overall valuation of its derivative positions and has determined that the credit valuation adjustments are not significant to the overall valuation of its derivatives due to collateral postings. The fair value of the Company's fixed rate interest rate lock commitments are determined using secondary market pricing for loans with similar structures, including term, rate and borrower credit quality, adjusted for the Company's pull-through rate estimate (i.e. estimate of loans within its pipeline that will ultimately complete the origination process and be funded). The Company has classified its fixed rate interest rate lock commitments as Level 2 as the quoted secondary market prices are the more significant input, and while the Company's internal pull-through rate estimate is a Level 3 estimate it is not as critical to the ultimate valuation. The fair value of the Company's forward delivery commitments are determined using secondary market pricing for loans with similar structures, including term, rate and borrower credit quality, and the locked and agreed to price with the secondary market investor. The Company has classified its fixed rate interest rate lock commitments as Level 2. The following table summarizes financial assets and financial liabilities measured at fair value on a recurring basis as of December 31, 2016 and 2015 , segregated by the level of the valuation inputs within the fair value hierarchy utilized to measure fair value: Fair Value Readily Available Market Prices (Level 1) Observable Market Data (Level 2) Company Determined Fair Value (Level 3) December 31, 2016 Financial assets: Loans held for sale $ 14,836 $ — $ 14,836 $ — AFS securities: Obligations of states and political subdivisions 9,001 — 9,001 — Mortgage-backed securities issued or guaranteed by U.S. government-sponsored enterprises 480,622 — 480,622 — Collateralized mortgage obligations issued or guaranteed by U.S. government-sponsored enterprises 283,890 — 283,890 — Subordinated corporate bonds 5,613 — 5,613 — Equity securities 741 — 741 — Customer loan swaps 1,945 — 1,945 — Fixed-rate interest rate lock commitments 202 — 202 — Forward delivery commitments 587 — 587 — Financial liabilities: Junior subordinated debt interest rate swaps 8,372 — 8,372 — FHLBB advance interest rate swaps 389 — 389 — Customer loan swaps 1,945 — 1,945 — Fixed-rate interest rate lock commitments 15 — 15 — Forward delivery commitments 309 — 309 — December 31, 2015 Financial assets: Loans held for sale $ 10,958 $ — $ 10,958 $ — AFS securities: Obligations of U.S. government-sponsored enterprises 5,040 — 5,040 — Obligations of states and political subdivisions 17,694 — 17,694 — Mortgage-backed securities issued or guaranteed by U.S. government-sponsored enterprises 419,046 — 419,046 — Collateralized mortgage obligations issued or guaranteed by U.S. government-sponsored enterprises 306,857 — 306,857 — Subordinated corporate bonds 996 — 996 — Equity securities 705 — 705 — Customer loan swaps 3,166 — 3,166 — Fixed-rate interest rate lock commitments 229 — 229 — Financial liabilities: Junior subordinated debt interest rate swaps 9,229 — 9,229 — FHLBB advance interest rate swaps 576 — 576 — Customer loan swaps 3,166 — 3,166 — Fixed-rate interest rate lock commitments 90 — 90 — The Company did not have any transfers between Level 1 and Level 2 of the fair value hierarchy for the year ended December 31, 2016 . The Company’s policy for determining transfers between levels occurs at the end of the reporting period when circumstances in the underlying valuation criteria change and result in transfer between levels. Financial Instruments Recorded at Fair Value on a Nonrecurring Basis The Company may be required, from time to time, to measure certain financial assets and financial liabilities at fair value on a nonrecurring basis in accordance with GAAP. These include assets that are measured at the lower of cost or fair value that were recognized at fair value below cost at the end of the period. Collateral-Dependent Impaired Loans : Loans for which it is probable that payment of interest and principal will not be made in accordance with the contractual terms of the loan agreement are considered impaired. The Company's policy is to individually evaluate for impairment loans with a principal balance greater than $250,000 or more and are classified as substandard or doubtful and are on non-accrual status. Once the population of loans is identified for individual impairment assessment, the Company measures these loans for impairment by comparing NRV, which is the fair value of the collateral, less estimated costs to sell, to the carrying value of the loan. If the NRV of the loan is less than the carrying value of the loan, then a loss is recognized as part of the ALL to adjust the loan's carrying value to NRV. Accordingly, certain collateral-dependent impaired loans are subject to measurement at fair value on a non-recurring basis. Management has estimated the fair values of these assets using Level 2 inputs, such as the fair value of collateral based on independent third-party market approach appraisals for collateral-dependent loans, and Level 3 inputs where circumstances warrant an adjustment to the appraised value based on the age of the appraisal and/or comparable sales, condition of the collateral, and market conditions. MSRs : The Company accounts for mortgage servicing assets at cost, subject to impairment testing. When the carrying value of a tranche exceeds fair value, a valuation allowance is established to reduce the carrying cost to fair value. Fair value is based on a valuation model that calculates the present value of estimated net servicing income. The Company obtains a third-party valuation based upon loan level data including note rate, type and term of the underlying loans. The model utilizes a variety of observable inputs for its assumptions, the most significant of which are loan prepayment assumptions and the discount rate used to discount future cash flows. Other assumptions include delinquency rates, servicing cost inflation and annual unit loan cost. MSRs are classified within Level 2 of the fair value hierarchy. Non-Financial Assets and Non-Financial Liabilities Recorded at Fair Value on a Nonrecurring Basis The Company has no non-financial assets or non-financial liabilities measured at fair value on a recurring basis. Non-financial assets measured at fair value on a non-recurring basis consist of OREO and goodwill. OREO : OREO properties acquired through foreclosure or deed in lieu of foreclosure are recorded at NRV, which is the fair value of the real estate, less estimated costs to sell. Any write-down of the recorded investment in the related loan is charged to the ALL upon transfer to OREO. Upon acquisition of a property, a current appraisal is used or an internal valuation is prepared to substantiate fair value of the property. After foreclosure, management periodically, but at least annually, obtains updated valuations of the OREO properties and, if additional impairments are deemed necessary, the subsequent write-downs for declines in value are recorded through a valuation allowance and a provision for losses charged to other non-interest expense within the consolidated statements of income. As management considers appropriate, adjustments are made to the appraisal obtained for the OREO property to account for recent sales activity of comparable properties, changes in the condition of the property, and changes in market conditions. These adjustments are not observable in an active market and are classified as Level 3. Goodwill and Other Intangible Assets : Goodwill represents the excess cost of an acquisition over the fair value of the net assets acquired. The fair value of goodwill is estimated by utilizing several standard valuation techniques, including discounted cash flow analyses, bank merger multiples, and/or an estimation of the impact of business conditions and investor activities on the long-term value of the goodwill. Should an impairment of either reporting unit's goodwill occur, the associated goodwill is written-down to fair value and the impairment charge is recorded within non-interest expense in the consolidated statements of income. The Company conducts an annual impairment test of goodwill in the fourth quarter each year, or more frequently as necessary. There were no indications or triggering events for the year ended December 31, 2016 or 2015 for which management believed that it was more likely than not that goodwill is impaired. The Company's core deposit intangible assets represent the estimated value of acquired customer relationships and are amortized on a straight-line basis over the estimated life of those relationships. Core deposit intangibles are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount may not be recoverable. If necessary, management will test the core deposit intangibles for impairment by comparing its carrying value to the expected undiscounted cash flows of the assets. If the undiscounted cash flows of the intangible assets exceed its carrying value then the intangible assets are deemed to be fully recoverable and not impaired. However, if the undiscounted cash flows of the intangible assets are less than its carrying value than an impairment charge is recorded to mark the carrying value of the intangible assets to fair value. There were no indications or triggering events for the year ended December 31, 2016 or 2015 for which management believes that the carrying amount may not be recoverable. The table below highlights financial and non-financial assets measured and recorded at fair value on a non-recurring basis as of December 31, 2016 and 2015 : Fair Value Readily Available Market Prices (Level 1) Observable Market Data (Level 2) Company Determined Fair Value (Level 3) December 31, 2016 Financial assets: Collateral-dependent impaired loans $ 500 $ — $ — $ 500 MSRs (1) 1,090 — 1,090 — Non-financial assets: OREO 922 — — 922 December 31, 2015 Financial assets: Collateral-dependent impaired loans $ 1,971 $ — $ — $ 1,971 MSRs (1) 440 — 440 — Non-financial assets: OREO 1,304 — — 1,304 (1) Represents MSRs deemed to be impaired and a valuation allowance was established to carry at fair value at December 31, 2016 and 2015 . The following table presents the valuation methodology and unobservable inputs for Level 3 assets measured at fair value on a non-recurring basis at December 31, 2016 and 2015 : Fair Value Valuation Methodology Unobservable input Discount Range (Weighted-Average) December 31, 2016 Collateral-dependent impaired loans: Partially charged-off $ 166 Market approach appraisal of collateral Management adjustment of appraisal 0% (0%) Estimated selling costs 0 - 10% (5%) Specifically reserved 334 Market approach appraisal of collateral Management adjustment of appraisal 0 - 50% (13%) Estimated selling costs 10% (10%) OREO 922 Market approach appraisal of collateral Management adjustment of appraisal 0 - 73% (7%) Estimated selling costs 10% (10%) December 31, 2015 Collateral-dependent impaired loans: Partially charged-off $ 399 Market approach appraisal of collateral Management adjustment of appraisal 0% (0%) Estimated selling costs 0 - 10% (7%) Specifically reserved 1,572 Market approach appraisal of collateral Management adjustment of appraisal 0 - 57% (45%) Estimated selling costs 10% (10%) OREO 1,304 Market approach appraisal of collateral Management adjustment of appraisal 0 - 43% (18%) Estimated selling costs 10% (10%) GAAP requires disclosure of the fair value of financial assets and financial liabilities, including those financial assets and financial liabilities that are not measured and reported at fair value on a recurring basis or non-recurring basis. The methodologies for estimating the fair value of financial assets and financial liabilities that are measured at fair value on a recurring or non-recurring basis are discussed above. The following methods and assumptions were used by the Company in estimating the fair values of its other financial instruments. Cash and Due from Banks : The carrying amounts reported in the consolidated statements of condition approximate fair value that have original maturities of ninety days or less. HTM securities : The fair value is estimated utilizing prices provided by an independent pricing service based on recent trading activity and other observable information including, but not limited to, dealer quotes, market spreads, cash flows, market interest rate curves, market consensus prepayment speeds, credit information, and the bond’s terms and conditions. The fair value is classified as Level 2. Loans : For variable rate loans that reprice frequently and have no significant change in credit risk, fair values are based on carrying values. The fair value of other loans is estimated by discounting the future cash flows using the current rates at which similar loans would be made to borrowers with similar credit ratings and for the same remaining maturities. Interest Receivable and Payable : The carrying amounts reported in the consolidated statements of condition approximate fair value. Deposits : The fair value of demand, non-interest checking, savings and money market deposits is determined as the amount payable on demand at the reporting date. The fair value of time deposits is estimated by discounting the estimated future cash flows using market rates offered for deposits of similar remaining maturities. Borrowings : The carrying amounts of short-term borrowings from the FHLB, securities sold under repurchase agreements, notes payable and other short-term borrowings approximate fair value. The fair values of long-term borrowings and commercial repurchase agreements are based on the discounted cash flows using current rates for advances of similar remaining maturities. Subordinated Debentures : The fair values of are based on quoted prices from similar instruments in inactive markets. The following table presents the carrying amounts and estimated fair value for financial instrument assets and liabilities at December 31, 2016 : Carrying Amount Fair Value Readily Available Market Prices (Level 1) Observable Market Prices (Level 2) Company Determined Market Prices (Level 3) Financial assets: Cash and due from banks $ 87,707 $ 87,707 $ 87,707 $ — $ — AFS securities 779,867 779,867 — 779,867 — HTM securities 94,609 94,596 — 94,596 — Loans held for sale 14,836 14,836 — 14,836 — Residential real estate loans (1) 798,334 800,122 — — 800,122 Commercial real estate loans (1) 1,038,626 1,006,249 — — 1,006,249 Commercial loans (1)(2) 389,624 391,493 — — 391,493 Home equity loans (1) 327,713 327,292 — — 327,292 Consumer loans (1) 17,151 16,845 — — 16,845 MSRs (3) 1,210 1,701 — 1,701 — Interest receivable 8,654 8,654 — 8,654 — Customer loan swaps 1,945 1,945 — 1,945 — Fixed-rate interest rate lock commitments 202 202 — 202 — Forward delivery commitments 587 587 — 587 — Financial liabilities: Deposits $ 2,828,529 $ 2,826,484 $ — $ 2,826,484 $ — Short-term borrowings 530,129 530,435 — 530,435 — Long-term borrowings 10,791 10,836 — 10,836 — Subordinated debentures 58,755 41,660 — 41,660 — Interest payable 534 534 — 534 — Junior subordinated debt interest rate swaps 8,372 8,372 — 8,372 — Forward-starting interest rate swaps 389 389 — 389 — Customer loan swaps 1,945 1,945 — 1,945 — Fixed-rate interest rate lock commitments 15 15 — 15 — Forward delivery commitments 309 309 — 309 — (1) The presented carrying amount is net of the allocated ALL. (2) Includes the HPFC loan portfolio. (3) Reported fair value represents all MSRs currently being serviced by the Company at December 31, 2016 . The following table presents the carrying amounts and estimated fair value for financial instrument assets and liabilities at December 31, 2015 : Carrying Amount Fair Value Readily Available Market Prices (Level 1) Observable Market Prices (Level 2) Company Determined Market Prices (Level 3) Financial assets: Cash and due from banks $ 79,488 $ 79,488 $ 79,488 $ — $ — AFS securities 750,338 750,338 — 750,338 — HTM securities 84,144 85,647 — 85,647 — Loans held for sale 10,958 10,958 — 10,958 — Residential real estate loans (1) 808,180 820,774 — — 820,774 Commercial real estate loans (1) 922,257 911,316 — — 911,316 Commercial loans (1)(2) 371,684 371,854 — — 371,854 Home equity loans (1) 349,215 348,963 — — 348,963 Consumer loans (1) 17,704 18,163 — — 18,163 MSRs (3) 2,161 2,947 — 2,947 — Interest receivable 7,985 7,985 — 7,985 — Customer loan swaps 3,166 3,166 — 3,166 — Fixed-rate interest rate lock commitments 229 229 — 229 — Financial liabilities: Deposits $ 2,726,379 $ 2,726,300 $ — $ 2,726,300 $ — Short-term borrowings 477,852 479,403 — 479,403 — Long-term borrowings 35,911 36,307 — 36,307 — Subordinated debentures 58,599 42,950 — 42,950 — Interest payable 641 641 — 641 — Junior subordinated debt interest rate swaps 9,229 9,229 — 9,229 — Forward-starting interest rate swaps 576 576 — 576 — Customer loan swaps 3,166 3,166 — 3,166 — Fixed-rate interest rate lock commitments 90 90 — 90 — (1) The presented carrying amount is net of the allocated ALL. (2) Includes the HPFC loan portfolio. (3) Reported fair value represents all MSRs currently being serviced by the Company at December 31, 2015 .

Regulatory Capital Requirements

Regulatory Capital Requirements	12 Months Ended
	Dec. 31, 2016
Regulatory Capital Requirements [Abstract]
Regulatory Capital Requirements	Regulatory Capital Requirements The Company and Bank are subject to various regulatory capital requirements administered by the FRB and the OCC. Failure to meet minimum capital requirements can result in mandatory and possible additional discretionary actions by regulators that, if undertaken, could have a direct material effect on the Company’s consolidated financial statements. The Company and the Bank are required to maintain certain levels of capital based on risk-adjusted assets. These capital requirements represent quantitative measures of their assets, liabilities and certain off-balance sheet items as calculated under regulatory accounting practices. The Company and the Bank's capital classification is also subject to qualitative judgments by our regulators about components, risk weightings and other factors. The quantitative measures established to ensure capital adequacy require us to maintain minimum amounts and ratios of total, Tier I capital, and common equity Tier I to risk-weighted assets, and of Tier I capital to average assets, or leverage ratio. These guidelines apply to the Company on a consolidated basis. Under the current guidelines, banking organizations must have a minimum total risk-based capital ratio of 8.0% , a minimum Tier I risk-based capital ratio of 6.0% , a minimum common equity Tier I risk-based capital ratio of 4.5% , and a minimum leverage ratio of 4.0% in order to be "adequately capitalized." In addition to these requirements, banking organizations must maintain a 2.5% capital conservation buffer consisting of common Tier I equity, subject to a transition schedule with a full phase-in by 2019. Effective January 1, 2016, the Company and the Bank were required to establish a capital conservation buffer of 0.625% , increasing the minimum required total risk-based capital, Tier I risk-based and common equity Tier I capital to risk-weighted assets they must maintain to avoid limits on capital distributions and certain bonus payments to executive officers and similar employees. The Company and Bank's risk-based capital ratios exceeded regulatory guidelines at December 31, 2016 and 2015 , and, specifically, the Bank was "well capitalized" under prompt correct action provisions for each period. There were no conditions or events that occurred subsequent to December 31, 2016 that would change the Company or Bank's regulatory capital categorization. The following table presents the Company and Bank's regulatory capital ratios at the periods indicated: December 31, Minimum Regulatory Capital Required for Capital Adequacy plus Capital Conservation Buffer Minimum Regulatory Provision To Be "Well Capitalized" Under Prompt Corrective Action Provisions December 31, Minimum Regulatory Capital Required For Capital Adequacy Purposes Minimum Regulatory Provision To Be "Well Capitalized" Under Prompt Corrective Action Provisions Amount Ratio Amount Ratio Camden National Corporation: Total risk-based capital ratio $ 368,856 14.04 % 8.63 % N/A $ 335,740 12.98 % 8.00 % N/A Tier I risk-based capital ratio 330,729 12.59 % 6.63 % N/A 299,552 11.58 % 6.00 % N/A Common equity Tier I risk-based capital ratio 296,120 11.27 % 5.13 % N/A 269,350 10.42 % 4.50 % N/A Tier I leverage capital ratio 330,729 8.83 % 4.00 % N/A 299,552 8.74 % 4.00 % N/A Camden National Bank: Total risk-based capital ratio $ 340,908 12.92 % 8.63 % 10.00 % $ 304,847 11.75 % 8.00 % 10.00 % Tier I risk-based capital ratio 317,782 12.05 % 6.63 % 8.00 % 283,659 10.93 % 6.00 % 8.00 % Common equity Tier I risk-based capital ratio 317,782 12.05 % 5.13 % 6.50 % 283,659 10.93 % 4.50 % 6.50 % Tier I leverage capital ratio 317,782 8.54 % 4.00 % 5.00 % 283,659 8.33 % 4.00 % 5.00 % On October 8, 2015, the Company issued $15.0 million of 10 year subordinated debentures bearing interest at an annual rate of 5.50% . In addition, $43.0 million of junior subordinated debentures were issued in connection with the issuance of trust preferred securities in 2006 and 2008. Although the subordinated debentures and the junior subordinated debentures are recorded as liabilities on the Company's consolidated statements of condition, the Company is permitted, in accordance with regulatory guidelines, to include, subject to certain limits, each within its calculation of risk-based capital. At December 31, 2016 and 2015, $15.0 million of subordinated debentures were included as Tier II capital and were included in the calculation of the Company's total risk-based capital, and, at December 31, 2016 and December 31, 2015, $43.0 million of the junior subordinated debentures were included in Tier I and total risk-based capital for the Company. The Company and Bank's regulatory capital and risk-weighted assets fluctuate due to normal business, including profits and losses generated by the Company and Bank as well as changes to their asset mix. Of particular significance are changes within the Company and Bank's loan portfolio mix due to the difference in regulatory risk-weighting differences between retail and commercial loans. Furthermore, the Company and Bank's regulatory capital and risk-weighted assets are subject to change due to changes in GAAP and regulatory capital standards. The Company and Bank proactively monitor their regulatory capital and risk-weighted assets, and the impact of changes to their asset mix, and impact of proposed and pending changes as a result of new and/or amended GAAP standards and regulatory changes.

Parent Company Financial Statem

Parent Company Financial Statements	12 Months Ended
	Dec. 31, 2016
Condensed Financial Information of Parent Company Only Disclosure [Abstract]
Parent Company Financial Statements	Parent Company Financial Statements Following are the condensed statements of condition, income and cash flows for the Company's parent company: STATEMENTS OF CONDITION December 31, 2016 2015 ASSETS Cash $ 29,905 $ 26,581 Investment in subsidiaries: Bank 429,100 394,404 Acadia Trust (1) — 10,232 Receivable from subsidiaries 107 1,926 Other assets 12,420 13,939 Total assets $ 471,532 $ 447,082 LIABILITIES AND SHAREHOLDERS’ EQUITY Subordinated debentures $ 58,755 $ 58,590 Due to subsidiaries 37 1,216 Other liabilities 21,193 24,086 Shareholders’ equity 391,547 363,190 Total liabilities and shareholders’ equity $ 471,532 $ 447,082 (1) Effective at the close of business November 30, 2016, Acadia Trust merged into Camden National Bank. STATEMENTS OF INCOME For The Year Ended December 31, 2016 2015 2014 Operating Income Dividend income from subsidiaries $ 16,000 $ 39,200 $ 12,800 Other income (loss) 239 (18 ) 104 Total operating income 16,239 39,182 12,904 Operating Expenses Interest on borrowings 3,415 2,734 2,532 Fees to Bank 160 160 160 Other operating expenses 748 469 453 Total operating expenses 4,323 3,363 3,145 Income before equity in undistributed earnings of subsidiaries and income taxes 11,916 35,819 9,759 Equity in undistributed income (losses) of subsidiaries 26,773 (15,999 ) 13,799 Income before income taxes 38,689 19,820 23,558 Income tax benefit 1,378 1,132 1,012 Net Income $ 40,067 $ 20,952 $ 24,570 STATEMENTS OF CASH FLOWS For The Year Ended December 31, 2016 2015 2014 Operating Activities Net income $ 40,067 $ 20,952 $ 24,570 Adjustments to reconcile net income to net cash provided by operating activities: Equity in undistributed (income) losses of subsidiaries (26,651 ) 4,573 (13,799 ) Gain on sale of investment securities (4 ) — — (Increase) decrease in receivable from subsidiaries 1,819 (1,901 ) 2,037 (Increase) decrease in other assets 1,213 (2,175 ) 165 Increase (decrease) in due to subsidiaries (1,179 ) 1,216 — Increase (decrease) in other liabilities (2,519 ) 320 (2,106 ) Net cash provided by operating activities 12,746 22,985 10,867 Investing Activities Acquisition of SBM, net of cash acquired — (25,319 ) — Proceeds from sale of investment securities 80 — — Proceeds from sale of assets — — 5,237 Net cash provided by (used in) investing activities 80 (25,319 ) 5,237 Financing Activities Issuance of subordinated debt, net of issuance costs — 14,464 — Exercise of stock options and issuance of restricted stock, net of repurchase for tax withholdings and tax benefit 894 753 328 Capital contribution from subsidiaries 1,997 836 599 Equity issuance costs — (612 ) — Common stock repurchase — — (7,475 ) Cash dividends paid on common stock and cash in-lieu paid for fractional shares due to stock split (12,393 ) (9,785 ) (8,085 ) Net cash provided by (used in) financing activities (9,502 ) 5,656 (14,633 ) Net increase in cash 3,324 3,322 1,471 Cash at beginning of year 26,581 23,259 21,788 Cash at end of year $ 29,905 $ 26,581 $ 23,259

Quarterly Results of Operations

Quarterly Results of Operations (Unaudited)	12 Months Ended
	Dec. 31, 2016
Quarterly Financial Information Disclosure [Abstract]
Quarterly Results of Operations (Unaudited)	Quarterly Results of Operations (Unaudited) The following table presents a summary of the quarterly results of operations for the year ended: December 31, 2016 2015 First Quarter (1) Second Quarter Third Quarter Fourth Quarter First Quarter Second Quarter Third Quarter Fourth Quarter (2) Interest income $ 31,981 $ 32,775 $ 32,594 $ 32,276 $ 22,448 $ 23,657 $ 23,056 $ 29,983 Interest expense 4,029 4,271 4,222 4,032 3,014 3,022 3,044 3,612 Net interest income 27,952 28,504 28,372 28,244 19,434 20,635 20,012 26,371 Provision for credit losses 872 2,852 1,279 255 446 254 279 957 Non-interest income 7,917 10,552 11,001 10,151 6,147 6,310 6,561 8,464 Non-interest expense 22,909 22,330 22,149 22,508 16,801 16,157 16,711 31,470 Income before income taxes 12,088 13,874 15,945 15,632 8,334 10,534 9,583 2,408 Income tax expense 3,442 4,258 5,042 4,730 2,723 3,341 3,127 716 Net income $ 8,646 $ 9,616 $ 10,903 $ 10,902 $ 5,611 $ 7,193 $ 6,456 $ 1,692 Per common share (3) : Basic $ 0.56 $ 0.62 $ 0.70 $ 0.70 $ 0.50 $ 0.64 $ 0.58 $ 0.11 Diluted $ 0.56 $ 0.62 $ 0.70 $ 0.70 $ 0.50 $ 0.64 $ 0.57 $ 0.11 (1) In the second quarter of 2016, the Company adopted ASU 2016-09 effective as of January 1, 2016. As such, first quarter 2016 financial results have been restated from previously reported within Form 10-Q. (2) On October 16, 2015, the Company completed its acquisition of SBM. Fourth quarter 2015 results of operations include revenues and expenses incurred as a combined organization from the acquisition date through December 31, 2015. The decrease in basic and diluted EPS in the fourth quarter of 2015 was due to acquisition costs and the issuance of 4.1 million shares of Company common stock (as adjusted for the three-for-two common stock split effective September 30, 2016) in connection with the acquisition. Refer to Note 2 for additional details of the acquisition. (3) Earnings per share amounts have been adjusted to reflect the three-for-two split effective September 30, 2016, for all periods presented. Refer to Note 13.

Business and Summary of Signi32

Business and Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2016
Accounting Policies [Abstract]
Principles of Consolidation	Principles of Consolidation . The accompanying consolidated financial statements include the accounts of the Company and the Bank (which includes the consolidated accounts of HPFC, Property A, Inc. and Property P, Inc.). All intercompany accounts and transactions have been eliminated in consolidation. Assets held by the Bank in a fiduciary capacity, through Camden National Wealth Management, are not assets of the Company and, therefore, are not included in the consolidated statements of condition. The Company also owns 100% of the common stock of CCTA and UBCT. These entities are unconsolidated subsidiaries of the Company.
Reclassifications	Reclassifications . Certain reclassifications have been made to prior year amounts to conform to the current year's presentation.
Use of Estimates	Use of Estimates . The preparation of the financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting periods. Actual results could vary from these estimates. Several estimates are particularly critical and are susceptible to significant near-term change, including the ALL, the accounting for business combinations including subsequent impairment analyses for goodwill and other intangible assets, accounting for income taxes, postretirement benefits and asset impairment judgments, including OTTI of investment securities.
Subsequent Events	Subsequent Events . The Company has evaluated events and transactions subsequent to December 31, 2016 for potential recognition or disclosure as required by GAAP.
Significant Concentration of Credit Risk	Significant Concentration of Credit Risk. The Bank grants loans primarily to customers in Maine. Although the Bank has a diversified loan portfolio, a large portion of the Bank's loans are secured by commercial or residential real estate located in Maine and is subject to volatility within Maine's real estate market. Furthermore, the debtors' ability to honor their contracts is highly dependent upon other economic factors throughout Maine. The Bank does not generally engage in non-recourse lending and typically will require the principals of any commercial borrower to obligate themselves personally on the loan.
Cash and Cash Equivalents	Cash and Cash Equivalents . For the purposes of reporting cash flows, cash and cash equivalents consist of cash on hand and amounts due from banks. The Bank is required by the FRB to maintain cash reserves equal to a percentage of deposits. The Company maintains the reserve balances in cash on hand or at the FRB.
Investment Securities	Investment Securities. Investment securities are classified at the time of purchase as AFS, HTM, or trading. The classification of investment securities are constantly re-evaluated for consistency with corporate goals and objectives. Trading securities are carried at fair value on the consolidated statements of condition with subsequent changes to fair value recorded in earnings. At December 31, 2016 and 2015, the Company did no t have any investment securities classified as trading securities on its consolidated statements of condition. Debt securities for which the Company has the positive intent and ability to hold to maturity are classified as HTM and recorded at amortized cost on the consolidated statements of condition. At December 31, 2016 and 2015, the Company had investment securities of $94.6 million and $84.1 million , respectively, classified as HTM and carried at amortized cost on its consolidated statements of condition. Investment securities that are not classified as HTM or trading securities are classified as AFS and are carried at fair value on the Company's consolidated statements of condition with subsequent changes to fair value recorded within AOCI, net of tax. At December 31, 2016 and 2015, the Company had investment securities of $779.9 million and $750.3 million , respectively, classified as AFS and carried at fair value on its consolidated statements of condition. Purchase premiums and discounts are recognized in interest income on the consolidated statements of income using the interest method over the period to maturity (or issuer call option date, if earlier) and are recorded on the trade date. Gains and losses on the sale of investment securities are recognized within non-interest income on the consolidated statements of income and are recorded on the trade date using the specific identification method. Management conducts a quarterly review and evaluation of its debt and equity securities portfolio to determine if the decline in fair value of any security appears to be other-than-temporary. The factors considered by management in its review include, but are not limited to: the length of time and the extent to which the fair value has been less than cost, the financial condition and near-term prospects of the issuer, the credit ratings of the security or issuer, whether the decline in fair value appears to be issuer specific or, alternatively, a reflection of general market or industry conditions, and the Company’s intent and ability to hold the security for a period of time sufficient to allow for a recovery in fair value. Should the Company determine that the decline in the fair value of an equity security was other-than-temporary, the Company recognizes the impairment on the equity security within non-interest income on the consolidated statements of income when identified. For debt securities where the Company does not intend to sell the security and it is not more-likely-than-not that the Company will be required to sell the security before recovery of its amortized cost basis, the other-than-temporary decline in the fair value of the debt security related to: (i) credit loss is recognized in non-interest income on the consolidated statements of income; and (ii) other factors is recognized in AOCI, net of tax. For debt securities where the Company intends to sell the security or more-likely-than-not will be required to sell the security before recovery of its amortized cost, the Company recognizes the OTTI equal to the entire difference between the security’s cost basis and its fair value within non-interest income on the consolidated statements of income. The
Loans Held for Sale	Loans Held for Sale. The Company has elected the fair value option for loans classified as held for sale on the consolidated statements of condition. Designation of loans as held for sale is determined based on the Company's intent and is, typically, completed as the loans are underwritten. The fair value for loans held for sale is determined using quoted secondary market prices or executed sales agreements. Management constantly evaluates its loan portfolio, in conjunction with asset/liability management practices, and will opt to sell certain loans, typically new 30 -year residential mortgages, to manage the Company's interest rate exposure and for other business purposes, including generating fee income through mortgage sale gains. At December 31, 2016 and 2015, the Company had designated $14.8 million and $11.0 million , respectively, of loans designated as held for sale on its consolidated statements of condition.
Interest and Fees on Loans	Originated Loans and Acquired Loans . Loans are reported at amortized cost, or amortized acquired fair value in the case of acquired loans, adjusted for any partial charge-offs and net of any deferred loan fees or costs. For originated loans, interest income is accrued based upon the daily principal amount outstanding except for loans on non-accrual status. For acquired loans, interest income is also accrued based upon the daily principal amount outstanding and is then further adjusted by the accretion of any discount or amortization of any premium associated with the loan. For originated loans, loan fees and certain direct origination costs are deferred and amortized into interest income over the contractual term of the loan using the level-yield method. When a loan is paid off, the unamortized portion is recognized in interest income. A loan is classified as non-accrual generally when it becomes 90 days past due as to interest or principal payments, or sooner if management considers such action to be prudent. All previously accrued but unpaid interest on non-accrual loans is reversed from interest income in the period in which the loan is considered delinquent and the amortization of any unamortized net deferred origination loan fees/costs stops. Interest payments received on non-accrual loans, including impaired loans, are applied as a reduction of principal. A loan remains on non-accrual status until all principal and interest amounts contractually due are brought current and future payments are reasonably assured. Should a loan transition from non-accrual status back to accrual status, the unrecognized interest earned during the period the loan was on non-accrual status and unamortized deferred origination fees and costs are recognized over the remaining contractual life of the loan using the level-yield method.
Goodwill and Core Deposit Intangible	Goodwill and Core Deposit Intangible Assets . Goodwill represents the excess cost of an acquisition over the fair value of the net assets acquired. Goodwill is not subject to amortization but rather is evaluated at least annually for impairment, or as events and circumstances dictate, at the reporting unit level. The Company's two reporting unit levels are (i) banking and (ii) financial services. The banking reporting unit is representative of the Company's core banking business line, while the financial services reporting unit is representative of the Company's wealth management and trust services business line. Any impairment is charged to non-interest expense on the consolidated statements of income. Goodwill is evaluated for impairment by the Company utilizing several standard valuation techniques, including, but not limited to discounted cash flow analyses and comparable transaction market multiples. The Company tests goodwill for impairment annually as of November 30 th utilizing the two-step process and fair value guidance outlined in GAAP. Step one compares the fair value of the reporting unit to its carrying value. If the fair value of the reporting unit is greater than its carrying value, then the reporting unit is not deemed to be impaired and no further assessment is required. However, if the fair value of the reporting unit is below its carrying value, GAAP requires that step two of the goodwill impairment test be performed. Step two involves a process similar to business combination accounting in which fair value is assigned to all assets, liabilities and other identified intangibles to derive an implied fair value of goodwill for the reporting unit. If the implied fair value of goodwill for the reporting unit is greater than its carrying value, then the reporting unit’s goodwill is not impaired. However, if the reporting unit’s implied fair value of goodwill is below its carrying value, an impairment charge is recorded to mark the carrying value of goodwill to the calculated implied fair value. The Company completed its annual goodwill impairment testing as of November 30, 2016 , 2015 and 2014 for each reporting unit and passed step one. As such, step two of the goodwill impairment test was not performed and no goodwill impairment was recognized for the year ended December 31, 2016, 2015 or 2014. Core deposit intangible assets represents the estimated value of acquired customer relationships and is amortized on a straight-line basis over the estimated life of those relationships ( 5 to 10 years from the acquisition dates). Core deposit intangibles are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount may not be recoverable. If necessary, management will test the core deposit intangibles for impairment by comparing its carrying value to the expected undiscounted cash flows of the assets. If the undiscounted cash flows of the intangible assets exceed its carrying value then the intangible assets are deemed to be fully recoverable and not impaired. However, if the undiscounted cash flows of the intangible assets are less than its carrying value then management must compare the fair value of the intangible assets to its carrying value. If the fair value of the intangible assets exceeds its carrying value then the intangible assets are not impaired. If the fair value of the intangible assets is less than its carrying value then an impairment charge is recorded to mark the carrying value of the intangible assets to fair value. For the year ended December 31, 2016 , 2015 or 2014 , there were no events or changes in circumstances that indicated the carrying amount may not be recoverable.
Bank-Owned Life Insurance	BOLI . BOLI represents the cash surrender value of life insurance policies on the lives of certain active and retired employees where the Company is the beneficiary and is recorded as an asset on the Company's consolidated statements of condition. Increases in the cash surrender values of the policies, as well as death benefits received, net of any cash surrender value, are recorded in non-interest income on the consolidated statements of income, and are not subject to income taxes. The Company reviews the financial strength of the insurance carriers prior to the purchase of life insurance policies and no less than annually thereafter. A life insurance policy with any individual carrier is limited to 15% of Tier I capital (as defined for regulatory purposes) and the total cash surrender value of life insurance policies is limited to 25% of Tier I capital.
Premises and Equipment	Premises and Equipment . Premises and equipment are stated at cost less accumulated depreciation. Acquired premises and equipment (through the acquisition of a company or branch acquisition) are stated at their estimated fair values as of the acquisition date less accumulated depreciation that occurred subsequent to the acquisition date. Depreciation and amortization are computed on the straight-line method over the estimated useful lives of the related assets. Leasehold improvements are amortized over the lesser of the term of the respective lease or the estimated life of the improvement. Land is carried at cost.
OREO	OREO . OREO properties acquired through foreclosure or deed-in-lieu of foreclosure are recorded initially at estimated fair value less estimated costs to sell. Any write-down of the recorded investment in the related loan is charged to the ALL upon transfer to OREO. Upon acquisition of a property, a current appraisal is used or an internal valuation is prepared to substantiate fair value of the property. Any subsequent declines in the fair value of a property are recorded as a valuation allowance on the asset. Any subsequent increases in the fair value of a property are recorded as reductions of the valuation allowance, but not below zero. Upon a sale of an OREO property, any excess of the carrying value over the sale proceeds is recognized as a loss on sale. Any excess of sale proceeds over the carrying value of the OREO property is first applied as a recovery to the valuation allowance, if any, with the remainder being recognized as a gain on sale. Operating expenses, including legal and other direct expenses, and changes in the valuation allowance relating to foreclosed assets are included in other non-interest expense on the consolidated statements of income.
Mortgage Servicing	Mortgage Servicing . Servicing assets are recognized as separate assets when servicing rights are acquired through the sale of residential mortgage loans with servicing rights retained. Capitalized servicing rights, which are reported in other assets on the consolidated statements of condition, are initially recorded at fair value and are amortized in proportion to, and over the period of, the estimated future servicing of the underlying mortgages (typically, the contractual life of the mortgage). 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 characteristics, such as interest rates and terms. Fair value is determined using prices for similar assets with similar characteristics, when available, or based upon discounted cash flows using market-based assumptions. Impairment is recognized through a valuation allowance to the extent that fair value is less than the capitalized amount. If it is later determined that all or a portion of the impairment no longer exists, a reduction of the allowance may be recorded increasing income, but not below zero. Servicing fee income is recorded for fees earned for servicing loans for investors. The fees are based on a contractual percentage of the outstanding principal or a fixed amount per loan and are recorded as income within non-interest income on the consolidated statements of income when earned. The amortization of mortgage servicing rights is recorded as a reduction of loan servicing fee income within non-interest income on the consolidated statements of income.
Other Borrowed Funds	. Short-term borrowings consist of borrowings maturing within one year of the consolidated statement of condition date, while long-term borrowings consist of borrowings maturing in one or more years. The Company's borrowings include retail and wholesale repurchase agreements, FHLBB overnight and short-term borrowings, federal funds purchased, a capital lease, and line of credit advances. The Company is required to post collateral for certain borrowings, for which it, generally, posts loans and/or investment securities as collateral.
Income Taxes	Income Taxes . Income taxes are accounted for using the asset and liability method. Under this method, deferred tax assets and liabilities are recognized for the future tax implications attributable to differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax bases. If current information suggests that it is not more likely than not that the Company will be able to realize the deferred tax assets, a valuation allowance is established. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which those temporary differences are expected to be recovered or settled. 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 assesses quarterly whether or not a valuation allowance on its deferred tax assets is necessary. If it is more likely than not that the Company will not be able to realize the benefit of the deferred tax assets then a valuation allowance is established on the deferred tax asset not expected to be realized. At December 31, 2016 and 2015, the Company did not carry a valuation allowance on its deferred tax assets.
Earnings per Share	EPS . Basic EPS excludes dilution and is computed by dividing net income applicable to common stock by the weighted-average number of common shares outstanding for the period. Diluted EPS reflects the potential dilution that could occur if certain securities or other contracts to issue common stock (such as stock options) were exercised or converted into additional common shares that would then share in the earnings of the Company. Diluted EPS is computed by dividing net income applicable to common stock by the weighted-average number of common shares outstanding for the period, plus an incremental number of common-equivalent shares computed using the treasury stock method. Unvested share-based payment awards which include the right to receive non-forfeitable dividends are considered to participate with common stock in undistributed earnings for purposes of computing EPS. Restricted share grants and management stock purchase grants are considered participating securities for this purpose. Accordingly, the Company is required to calculate basic and diluted EPS using the two-class method. The calculation of EPS using the two-class method (i) excludes any dividends paid or owed on participating securities and any undistributed earnings considered to be attributable to participating securities from the numerator and (ii) excludes the dilutive impact of the participating securities from the denominator.
Postretirement and Supplemental Retirement Plans	Postretirement Plans . The Company sponsors various retirement plans for current and former employees, including a postretirement health care plan and life insurance to certain eligible retired employees and a SERP for certain officers of the Company. The cost of providing postretirement health care and life insurance benefits is accrued during the active service period of the employee. The SERP is accrued on a current basis and recognizes costs over the estimated employee service period.
Stock-Based Compensation	Stock-Based Compensation . The fair value of restricted stock and stock options is determined on the grant date. For restricted stock awards and units, compensation is recognized ratably over the requisite service period equal to the fair value of the award. For stock option awards, the fair value is determined using the Black-Scholes option-pricing model. Compensation expense for stock option awards is recognized ratably over the requisite service period equal to the fair value of the award. For performance-based share awards, the Company estimates the degree to which performance conditions will be met to determine the number of shares that will vest and the related compensation expense. Compensation expense is adjusted in the period such estimates change. Non-forfeitable dividends, if any, paid on shares of restricted stock are recorded to retained earnings.
Off-Balance Sheet Credit Related Financial Instruments	Off-Balance Sheet Credit Related Financial Instruments . In the ordinary course of business, the Company enters into commitments to extend credit, including commercial letters of credit and standby letters of credit. Such financial instruments are recorded as loans when they are funded.
Derivative Financial Instruments Designated as Hedges	Derivative Financial Instruments Designated as Hedges . The Company recognizes all derivatives in the consolidated statements of condition at fair value. On the date the Company enters into the derivative contract, the Company designates the derivative as a hedge of either a forecasted transaction or the variability of cash flows to be received or paid related to a recognized asset or liability (“cash flow hedge”), a hedge of the fair value of a recognized asset or liability or of an unrecognized firm commitment (“fair value hedge”), or a held for trading instrument (“trading instrument”). The Company formally documents relationships between hedging instruments and hedged items, as well as its risk management objectives and strategy for undertaking various hedge transactions. The Company also assesses, both at the hedge’s inception and on an ongoing basis, whether the derivatives that are used in hedging transactions are effective in offsetting changes in cash flows or fair values of hedged items. Changes in fair value of a derivative that is effective and that qualifies as a cash flow hedge are recorded in OCI and are reclassified into earnings when the forecasted transaction or related cash flows affect earnings. Changes in fair value of a derivative that qualifies as a fair value hedge and the change in fair value of the hedged item are both recorded in earnings and offset each other when the transaction is effective. Those derivatives that are classified as trading instruments are recorded at fair value with changes in fair value recorded in earnings. The Company discontinues hedge accounting when it determines that the derivative is no longer effective in offsetting changes in the cash flows of the hedged item, that it is unlikely that the forecasted transaction will occur, or that the designation of the derivative as a hedging instrument is no longer appropriate.
Segment Reporting	Segment Reporting . The Company, through its bank subsidiary, provides a broad range of financial services to individuals and companies primarily in Maine. These services include lending, checking, savings and time deposits, cash management, brokerage, wealth management and trust services. Substantially all of the Company's revenues, profits, and assets are derived by the Bank from banking products and services and, therefore, the Company's management did not provide the segment reporting disclosures as such was determined to be immaterial.
Recent Accounting Pronouncements	Recent Accounting Pronouncements . In January 2017, the FASB issued ASU No. 2017-04, Intangibles - Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment ("ASU 2017-04"). ASU 2017-04 was issued to reduce the cost and complexity of the goodwill impairment test. To simplify the subsequent measurement of goodwill, step two of the goodwill impairment test was eliminated. Instead, in accordance with ASU 2017-04, a Company will recognize an impairment of goodwill should the carrying value of a reporting unit exceed its fair value (i.e. step one). ASU 2017-04 will be effective for the Company on January 1, 2020 and will be applied prospectively. In June 2016, the FASB issued ASU No. 2016-13, Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments ("ASU 2016-13"). ASU 2016-13 was issued to require timelier recording of credit losses on loans and other financial instruments held by financial institutions and other organizations. ASU 2016-13 is effective for annual periods beginning after December 15, 2019, including interim periods within those fiscal years, for public companies. Early adoption is permitted for annual periods beginning after December 15, 2018, including interim periods within that fiscal year. While the Company continues to prepare for the adoption of ASU 2016-13 on January 1, 2020, it anticipates the standard will have a material impact on the Company's consolidated financial statements upon adoption as it will require a change in the Company's assessment of its ALL and allowance on unused commitments as it will transition from an incurred loss model to an expected loss model, which will likely result in an increase in the ALL upon adoption and may negatively impact the Company and Bank's regulatory capital ratios. Additionally, ASU 2016-13 may reduce the carrying value of the Company's HTM investment securities as it will require an allowance on the expected losses over the life of these securities to be recorded upon adoption. In February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842) ("ASU 2016-02"). ASU 2016-02 was issued to increase transparency and comparability among organizations by recognizing lease assets and liabilities (including operating leases) on the balance sheet and disclosing key information about leasing arrangements. Current lease accounting does not require the inclusion of operating leases in the balance sheet. ASU 2016-02 is effective for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years, early application is permitted. The Company expects ASU 2016-02 will have a material effect on its consolidated financial statements primarily due to the Bank's existing lease agreements for its banking centers. The Company continues to evaluate the impact of adoption of this standard. In January 2016, the FASB issued ASU No. 2016-01, Income Statement - Financial Instruments - Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Liabilities ("ASU 2016-01"). ASU 2016-01 was issued to enhance the reporting model for financial instruments to provide the users of financial statements with more useful information for decisions. ASU 2016-01 is effective for fiscal years beginning after December 15, 2017, including interim periods within those fiscal years. The Company will adopt ASU 2016-01 effective January 1, 2018. Upon adoption, the Company will be required to recognize unrealized gains and losses on its equity securities directly through the Company's consolidated statements of income, whereas these equity securities currently are designated as AFS and unrealized gains and losses are recognized within AOCI. At December 31, 2016, the fair value of the Company's equity securities was $741,000 with a cost basis of $632,000 . The Company does not anticipate that portion of ASU 2016-01 will materially impact the Company's financial position upon adoption. ASU 2016-01 also requires Companies to utilize an "exit price" fair value methodology for purposes of disclosing the fair value of financial assets and liabilities not measured and reported at fair value on a recurring or non-recurring basis. The Company currently discloses the fair value of its loan portfolio segments using an "entry price" fair value methodology (as disclosed within Note 19). The Company does not believe ASU 2016-01 will materially affect its consolidated financial statements. In August 2015, the FASB issued ASU No. 2015-14, Revenue from Contracts with Customers (Topic 606) : Deferral of the Effective Date ("ASU 2015-14"). ASU 2015-14 was issued to defer the effective date of ASU 2014-09, Revenue from Contracts with Customers (Topic 606) ("ASU 2014-09"), for all entities by one year. ASU 2014-09 was issued to clarify the principles for recognizing revenue and to develop a common revenue standard. ASU 2014-09 is now effective for annual reporting periods beginning after December 15, 2017, including interim reporting periods within that reporting period. Effective January 1, 2018, the Company will adopt ASU 2014-09 and, while it continues to evaluate the potential impact of ASU 2014-09, it does not expect ASU 2014-09 will have a material effect on its consolidated financial statements.
Loans and Leases Receivable, Allowance for Loan Losses Policy [Policy Text Block]	ALL. The ALL is established through provisions for loan losses charged to income. Losses on loans, including impaired loans, are charged to the ALL when all or a portion of a loan is deemed to be uncollectible. Recoveries of loans previously charged off are credited to the ALL when realized. In determining the appropriate level of ALL, the Company uses a methodology to systematically measure the amount of estimated loan loss exposure inherent in the loan portfolio. The methodology includes three elements: (1) identification of loss allocations for certain specific loans, (2) loss allocation factors for certain loan types based on credit risk and loss experience, and (3) general loss allocations for other qualitative and environmental factors. The allocations for specific loans component relates to loans that have a principal balance of $250,000 or more that are classified as substandard or doubtful and are on non-accrual status. For such loans that are also classified as impaired, an allowance is established when the discounted expected future cash flows (or collateral value or observable market price) of the impaired loan is lower than the recorded investment of that loan. Loans that do not meet the above criteria are separated into risk pools by portfolio segment and risk ratings. The Company then evaluates each risk pool collectively for impairment through loss allocation factors. Subsequent to December 31, 2016, the Company amended its internal policy for assessing individual loans for impairment by increasing the principal balance threshold to $500,000 . The qualitative factors for assessing a loan individually for impairment remain unchanged. The change in the Company's internal policy will be effective for periods beginning on January 1, 2017. The Company uses a risk rating system for certain loan segments to determine the credit quality of these loan pools and applies the related loss allocation factors. In assessing the risk rating of a particular loan, the Company considers, among other factors, the obligor’s debt capacity, financial condition, the level of the obligor’s earnings, the amount and sources of repayment, the performance with respect to loan terms, the adequacy of collateral, the level and nature of contingent liabilities, management strength, and the industry in which the obligor operates. These factors are based on an evaluation of historical information, as well as subjective assessment and interpretation of current conditions. Emphasizing one factor over another, or considering additional factors that may be relevant in determining the risk rating of a particular loan but which are not currently an explicit part of the Company's methodology, could impact the risk rating assigned to that loan. The Company at least annually, and more frequently as deemed prudent by management, reassesses and revises the loss allocation factors used in the assignment of loss exposure to appropriately reflect the analysis of loss experience. Portfolios of more homogenous populations of loans including home equity and consumer loans are analyzed as groups taking into account delinquency rates and other economic conditions which may affect the ability of borrowers to meet debt service requirements, including interest rates and energy costs. The Company also considers regulatory guidance, historical loss ranges, portfolio composition, and other changes in the portfolio. An additional allocation is determined based on a judgmental process whereby management considers qualitative and quantitative assessments of other environmental factors. Since the methodology is based upon historical experience and trends, as well as management’s judgment, factors may arise that result in different estimations. Significant factors that could give rise to changes in these estimates may include, but are not limited to, changes in economic conditions in the Company’s market areas, concentration of risk, declines in local property values, and regulatory guidance. Loans past due 30 days or more are considered delinquent. In general, secured loans that are delinquent for 90 consecutive days are placed on non-accrual status, and are subject to impairment and/or loss assessment in accordance with established internal policy. In general, unsecured loans that are delinquent for 90 consecutive days are charged off. In cases where a borrower experiences financial difficulties and the Company makes certain concessionary modifications to contractual terms, the loan is classified as a TDR. Modifications may include adjustments to interest rates, extensions of maturity, and other actions intended to minimize economic loss and avoid foreclosure or repossession of collateral. An allowance is established on a loan classified as a TDR if the present value of expected future cash flows (or, alternatively, the observable market price of the loan or the fair value of the collateral if the loan is collateral-dependent) is less than the recorded investment of the loan. Non-accrual loans that are restructured as TDRs remain on non-accrual status for a period of at least six months to demonstrate that the borrower can meet the restructured terms. If the restructured loan is on accrual status prior to being modified, it is reviewed to determine if the modified loan should remain on accrual status. If the borrower’s ability to meet the revised payment schedule is not reasonably assured, the loan is classified as a non-accrual loan. Loans classified as TDRs remain classified as such for the life of the loan, except in limited circumstances, when it is determined that the borrower is performing under the modified terms and the restructuring agreement specified an interest rate greater than or equal to an acceptable market rate for a comparable new loan at the time of the restructuring.

Mergers and Acquisitions (Table

Mergers and Acquisitions (Tables)	12 Months Ended
	Dec. 31, 2016
Business Combinations [Abstract]
Acquisition Related Costs	For the year ended December 31, 2016, 2015 and 2014, the Company incurred $866,000 , $10.4 million and $0 , respectively, of acquisition-related costs as detailed below: For The Year Ended December 31, 2016 2015 2014 Salaries and employee benefits (1) $ 8 $ 3,240 $ — Furniture, equipment and data processing 279 1,531 — Net occupancy 439 1,237 — Consulting and professional fees (2) 80 2,453 — Other expenses (3) 60 1,954 — Total merger and acquisition costs $ 866 $ 10,415 $ — (1) Includes the costs associated with pre-existing change-in-control agreements in place at the time of the Merger and employee termination costs, including severance. (2) Includes the cost of a negotiated non-compete arrangement entered into in connection with the Merger of $400,000 in 2015. (3) Other expenses include marketing and insurance costs, certain contract termination costs, various printing and mailing costs associated with various customer communications, and travel-related costs associated with the integration of the two companies in 2015. The following table summarizes the estimated fair value of the assets acquired and liabilities assumed as of the date of the acquisition: As Acquired Fair Value Adjustments (Previously Reported) Measurement-Period Adjustments As Recorded at Acquisition Consideration Paid: Cash $ 26,125 Company common stock (4,124,643 shares at $26.32 per share) 108,561 Non-qualified stock options 1,990 Total consideration paid 136,676 Recognized identifiable assets acquired and liabilities assumed, at fair value: Loans and loans held for sale $ 639,390 $ (11,497 ) $ 137 628,030 Cash and due from banks 86,042 — — 86,042 Investments 39,716 26 — 39,742 Deferred tax assets 26,293 (1,177 ) 666 25,782 Premises and equipment 16,851 7,093 — 23,944 OREO 2,530 (1,801 ) — 729 Core deposit intangible assets — 6,608 — 6,608 Other assets 5,421 (170 ) 157 5,408 Deposits and borrowings 719,640 1,546 — 721,186 Other liabilities 8,512 (198 ) — 8,314 Total identified assets acquired and liabilities assumed, at fair value $ 88,091 $ (2,266 ) $ 960 86,785 Goodwill $ 49,891

Securities (Tables)

Securities (Tables)	12 Months Ended
	Dec. 31, 2016
Investments, Debt and Equity Securities [Abstract]
Summary of Amortized Costs and Estimated Fair Values of Available-For-Sale Securities	The following tables summarize the amortized costs and estimated fair values of AFS and HTM securities, as of the dates indicated: Amortized Cost Unrealized Gains Unrealized Losses Fair Value December 31, 2016: AFS Securities: Obligations of states and political subdivisions $ 8,848 $ 153 $ — $ 9,001 Mortgage-backed securities issued or guaranteed by U.S. government-sponsored enterprises 485,222 2,515 (7,115 ) 480,622 Collateralized mortgage obligations issued or guaranteed by U.S. government-sponsored enterprises 289,046 265 (5,421 ) 283,890 Subordinated corporate bonds 5,481 132 — 5,613 Total AFS debt securities 788,597 3,065 (12,536 ) 779,126 Equity securities 632 109 — 741 Total AFS securities $ 789,229 $ 3,174 $ (12,536 ) $ 779,867 HTM Securities: Obligations of states and political subdivisions $ 94,609 $ 618 $ (631 ) $ 94,596 Total HTM securities $ 94,609 $ 618 $ (631 ) $ 94,596 December 31, 2015: AFS Securities: Obligations of U.S. government-sponsored enterprises $ 4,971 $ 69 $ — $ 5,040 Obligations of states and political subdivisions 17,355 339 — 17,694 Mortgage-backed securities issued or guaranteed by U.S. government-sponsored enterprises 419,429 3,474 (3,857 ) 419,046 Collateralized mortgage obligations issued or guaranteed by U.S. government-sponsored enterprises 312,719 409 (6,271 ) 306,857 Subordinated corporate bonds 1,000 — (4 ) 996 Total AFS debt securities 755,474 4,291 (10,132 ) 749,633 Equity securities 712 2 (9 ) 705 Total AFS securities $ 756,186 $ 4,293 $ (10,141 ) $ 750,338 HTM Securities: Obligations of states and political subdivisions $ 84,144 $ 1,564 $ (61 ) $ 85,647 Total HTM securities $ 84,144 $ 1,564 $ (61 ) $ 85,647
Unrealized Gross Losses and Estimated Fair Values of Investment Securities by Length of Time that Individual Securities in Each Category in Continuous Loss Position	The following table presents the estimated fair values and gross unrealized losses of investment securities that were in a continuous loss position at December 31, 2016 and 2015 , by length of time that individual securities in each category have been in a continuous loss position: Less Than 12 Months 12 Months or More Total Fair Value Unrealized Losses Fair Value Unrealized Losses Fair Value Unrealized Losses December 31, 2016: AFS Securities: Mortgage-backed securities issued or guaranteed by U.S. government-sponsored enterprises $ 348,579 $ (5,780 ) $ 29,496 $ (1,335 ) $ 378,075 $ (7,115 ) Collateralized mortgage obligations issued or guaranteed by U.S. government-sponsored enterprises 163,412 (2,906 ) 74,212 (2,515 ) 237,624 (5,421 ) Total AFS securities $ 511,991 $ (8,686 ) $ 103,708 $ (3,850 ) $ 615,699 $ (12,536 ) HTM Securities: Obligations of states and political subdivisions $ 42,805 $ (631 ) $ — $ — $ 42,805 $ (631 ) Total HTM securities $ 42,805 $ (631 ) $ — $ — $ 42,805 $ (631 ) December 31, 2015: AFS Securities: Mortgage-backed securities issued or guaranteed by U.S. government-sponsored enterprises $ 234,897 $ (2,351 ) $ 45,629 $ (1,506 ) $ 280,526 $ (3,857 ) Collateralized mortgage obligations issued or guaranteed by U.S. government-sponsored enterprises 111,143 (1,068 ) 147,180 (5,203 ) 258,323 (6,271 ) Subordinated corporate bonds 996 (4 ) — — 996 (4 ) Equity securities 615 (9 ) — — 615 (9 ) Total AFS securities $ 347,651 $ (3,432 ) $ 192,809 $ (6,709 ) $ 540,460 $ (10,141 ) HTM Securities: Obligations of states and political subdivisions $ 5,507 $ (61 ) $ — $ — $ 5,507 $ (61 ) Total HTM securities $ 5,507 $ (61 ) $ — $ — $ 5,507 $ (61 )
Company's Sales of Securities	The following table details the Company’s sales of AFS investment securities, the gross realized gains and losses, and OTTI of securities: For The Year Ended December 31, 2016 2015 2014 Proceeds from sales of securities $ 28,850 $ 12,426 $ 25,695 Gross realized gains 125 221 451 Gross realized losses (74 ) (217 ) — Previously recorded OTTI — 204 —
Amortized Cost and Estimated Fair Values of Debt Securities by Contractual Maturity	The amortized cost and estimated fair values of securities by contractual maturity at December 31, 2016 are shown below. Expected maturities will differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties. Amortized Cost Fair Value AFS Securities Due in one year or less $ 1,034 $ 1,039 Due after one year through five years 86,362 86,299 Due after five years through ten years 129,521 129,248 Due after ten years 571,680 562,540 $ 788,597 $ 779,126 HTM Securities Due after one year through five years $ 5,599 $ 5,650 Due after five years through ten years 4,210 4,221 Due after ten years 84,800 84,725 $ 94,609 $ 94,596

Loans and Allowance for Loan 35

Loans and Allowance for Loan Losses (Tables)	12 Months Ended
	Dec. 31, 2016
Receivables [Abstract]
Composition of Loan Portfolio, Excluding Residential Loans Held for Sale	The composition of the Company’s loan portfolio, excluding residential loans held for sale, at December 31, 2016 and 2015 was as follows: December 31, 2016 2015 Residential real estate loans $ 802,494 $ 820,617 Commercial real estate loans 1,050,780 927,951 Commercial loans 333,639 297,721 Home equity loans 329,907 348,634 Consumer loans 17,332 17,953 HPFC 60,412 77,330 Total loans $ 2,594,564 $ 2,490,206
Schedule of Loans Made to Related Parties	Loans, including any unused lines of credit, to related parties were as follows: December 31, 2016 2015 Balance at beginning of year $ 16,628 $ 17,469 Loans made/advanced and additions 434 374 Repayments and reductions (1,120 ) (1,215 ) Balance at end of year $ 15,942 $ 16,628
Activity in Allowance for Loan Losses by Portfolio Segment	The following table presents the activity in the ALL and select loan information by portfolio segment for the year ended December 31, 2016 , 2015 , and 2014 : Residential Real Estate Commercial Real Estate Commercial Home Equity Consumer HPFC Unallocated Total For The Year Ended December 31, 2016: ALL: Beginning balance $ 4,545 $ 10,432 $ 3,241 $ 2,731 $ 193 $ 24 $ — $ 21,166 Loans charged off (356 ) (315 ) (2,218 ) (308 ) (101 ) (507 ) — (3,805 ) Recoveries 95 50 332 2 7 — — 486 Provision (credit) (1) (124 ) 1,987 2,400 (231 ) 82 1,155 — 5,269 Ending balance $ 4,160 $ 12,154 $ 3,755 $ 2,194 $ 181 $ 672 $ — $ 23,116 ALL balance attributable loans: Individually evaluated for impairment $ 483 $ 1,373 $ — $ 86 $ — $ 65 $ — $ 2,007 Collectively evaluated for impairment 3,677 10,781 3,755 2,108 181 607 — 21,109 Total ending ALL $ 4,160 $ 12,154 $ 3,755 $ 2,194 $ 181 $ 672 $ — $ 23,116 Loans: Individually evaluated for impairment $ 4,348 $ 13,317 $ 2,028 $ 457 $ 7 $ 97 $ — $ 20,254 Collectively evaluated for impairment 798,146 1,037,463 331,611 329,450 17,325 60,315 — 2,574,310 Total loan balances $ 802,494 $ 1,050,780 $ 333,639 $ 329,907 $ 17,332 $ 60,412 $ — $ 2,594,564 For The Year Ended December 31, 2015: ALL: Beginning balance $ 4,899 $ 7,951 $ 3,354 $ 2,247 $ 281 $ — $ 2,384 $ 21,116 Loans charged off (801 ) (481 ) (655 ) (525 ) (154 ) — — (2,616 ) Recoveries 55 74 389 188 22 — — 728 Provision (credit) (1) 392 2,888 153 821 44 24 (2,384 ) 1,938 Ending balance $ 4,545 $ 10,432 $ 3,241 $ 2,731 $ 193 $ 24 $ — $ 21,166 ALL balance attributable loans: Individually evaluated for impairment $ 544 $ 644 $ 92 $ 89 $ — $ — $ — $ 1,369 Collectively evaluated for impairment 4,001 9,788 3,149 2,642 193 24 — 19,797 Total ending ALL $ 4,545 $ 10,432 $ 3,241 $ 2,731 $ 193 $ 24 $ — $ 21,166 Loans: Individually evaluated for impairment $ 6,026 $ 4,610 $ 3,937 $ 588 $ 74 $ — $ — $ 15,235 Collectively evaluated for impairment 814,591 923,341 293,784 348,046 17,879 77,330 — 2,474,971 Total loan balances $ 820,617 $ 927,951 $ 297,721 $ 348,634 $ 17,953 $ 77,330 $ — $ 2,490,206 For The Year Ended December 31, 2014: Residential Real Estate Commercial Real Estate Commercial Home Equity Consumer HPFC Unallocated Total ALL: Beginning balance $ 5,603 $ 7,206 $ 3,388 $ 2,403 $ 319 $ — $ 2,671 $ 21,590 Loans charged off (785 ) (361 ) (1,544 ) (611 ) (143 ) — — (3,444 ) Recoveries 165 136 394 19 32 — — 746 Provision (credit) (1) (84 ) 970 1,116 436 73 — (287 ) 2,224 Ending balance $ 4,899 $ 7,951 $ 3,354 $ 2,247 $ 281 $ — $ 2,384 $ 21,116 ALL balance attributable loans: Individually evaluated for impairment $ 787 $ 78 $ 10 $ — $ 78 $ — $ — $ 953 Collectively evaluated for impairment 4,112 7,873 3,344 2,247 203 — 2,384 20,163 Total ending ALL $ 4,899 $ 7,951 $ 3,354 $ 2,247 $ 281 $ — $ 2,384 $ 21,116 Loans: Individually evaluated for impairment $ 6,411 $ 5,379 $ 646 $ 331 $ 157 $ — $ — $ 12,924 Collectively evaluated for impairment 579,057 635,282 256,869 271,378 17,100 — — 1,759,686 Total loan balances $ 585,468 $ 640,661 $ 257,515 $ 271,709 $ 17,257 $ — $ — $ 1,772,610 (1) The provision (credit) for loan losses excludes any impact for the change in the reserve for unfunded commitments, which represents management's estimate of the amount required to reflect the probable inherent losses on outstanding letters of credit and unused lines of credit. The reserve for unfunded commitments is presented within accrued interest and other liabilities on the consolidated statements of condition. At December 31, 2016 , 2015 , and 2014 , the reserve for unfunded commitments was $11,000 , $22,000 and $17,000 , respectively.
Schedule of Provision for Credit Losses	he following table reconciles the year ended December 31, 2016 , 2015 , and 2014 provision for loan losses to the provision for credit losses as presented on the consolidated statement of income: For the Year Ended December 31, 2016 2015 2014 Provision for loan losses $ 5,269 $ 1,938 $ 2,224 Change in reserve for unfunded commitments (11 ) (2 ) (4 ) Provision for credit losses $ 5,258 $ 1,936 $ 2,220
Credit Risk Exposure Indicators by Portfolio Segment	The following table summarizes credit risk exposure indicators by portfolio segment as of the following dates: Residential Real Estate Commercial Real Estate Commercial Home Equity Consumer HPFC Total December 31, 2016: Pass (Grades 1 – 6) $ 789,554 $ 1,003,386 $ 321,148 $ — $ — $ 58,943 $ 2,173,031 Performing — — — 328,287 17,328 — 345,615 Special Mention (Grade 7) 2,387 5,724 5,598 — — 257 13,966 Substandard (Grade 8) 10,553 41,670 5,437 — — 1,212 58,872 Doubtful (Grade 9) — — 1,456 — — — 1,456 Non-performing — — — 1,620 4 — 1,624 Total $ 802,494 $ 1,050,780 $ 333,639 $ 329,907 $ 17,332 $ 60,412 $ 2,594,564 December 31, 2015: Pass (Grades 1 – 6) $ 802,873 $ 868,664 $ 281,553 $ — $ — $ 70,173 $ 2,023,263 Performing — — — 346,701 17,835 — 364,536 Special Mention (Grade 7) 3,282 20,732 7,527 — — 3,179 34,720 Substandard (Grade 8) 14,462 38,555 8,641 — — 3,978 65,636 Non-performing — — — 1,933 118 — 2,051 Total $ 820,617 $ 927,951 $ 297,721 $ 348,634 $ 17,953 $ 77,330 $ 2,490,206
Loan Aging Analysis by Portfolio Segment (Including Loans Past Due Over Ninety Days and Non Accrual Loans) and Summary of Non Accrual Loans, Which Include Troubled Debt Restructured Loans, and Loans Past Due Over Ninety Days and Accruing	The following is a loan aging analysis by portfolio segment (including loans past due over 90 days and non-accrual loans) and a summary of non-accrual loans, which include TDRs, and loans past due over 90 days and accruing as of the following dates: 30 – 59 Days Past Due 60 – 89 Days Past Due Greater Than 90 Days Total Past Due Current Total Loans Outstanding Loans > 90 Days Past Due and Accruing Non-Accrual Loans December 31, 2016: Residential real estate $ 1,783 $ 924 $ 2,904 $ 5,611 $ 796,883 802,494 $ — $ 3,945 Commercial real estate 855 223 12,625 13,703 1,037,077 1,050,780 — 12,849 Commercial 633 218 1,675 2,526 331,113 333,639 — 2,088 Home equity 892 134 1,321 2,347 327,560 329,907 — 1,620 Consumer 38 — 4 42 17,290 17,332 — 4 HPFC 438 688 110 1,236 59,176 60,412 — 207 Total $ 4,639 $ 2,187 $ 18,639 $ 25,465 $ 2,569,099 $ 2,594,564 $ — $ 20,713 December 31, 2015: Residential real estate $ 3,325 $ 571 $ 6,077 $ 9,973 $ 810,644 $ 820,617 $ — $ 7,253 Commercial real estate 4,219 2,427 1,584 8,230 919,721 927,951 — 4,529 Commercial 267 550 1,002 1,819 295,902 297,721 — 4,489 Home equity 643 640 1,505 2,788 345,846 348,634 — 1,933 Consumer 112 7 118 237 17,716 17,953 — 118 HPFC 165 — — 165 77,165 77,330 — — Total $ 8,731 $ 4,195 $ 10,286 $ 23,212 $ 2,466,994 $ 2,490,206 $ — $ 18,322
Troubled Debt Restructuring and Specific Reserve Related to TDRs	The following is a summary of TDRs, by portfolio segment, and the associated specific reserve included within the ALL as of December 31: Number of Contracts Recorded Investment Specific Reserve 2016 2015 2016 2015 2016 2015 Residential real estate 21 22 $ 3,221 $ 3,398 $ 483 $ 544 Commercial real estate 3 6 1,008 1,459 — 48 Commercial 10 9 1,502 399 — 11 Consumer and home equity 1 1 16 21 — — Total 35 38 $ 5,747 $ 5,277 $ 483 $ 603
Summary of All Troubled Debt Restructuring Loans (Accruing and Non Accruing) by Portfolio Segment	The following represents loan modifications that occurred for the year ended December 31, 2016 , 2015 and 2014 that qualify as TDRs and the type of loan modification made by portfolio segment at December 31: Number of Contracts Pre-Modification Outstanding Recorded Investment Post-Modification Outstanding Recorded Investment Specific Reserve 2016 2015 2014 2016 2015 2014 2016 2015 2014 2016 2015 2014 Residential real estate: Maturity concession — — 1 $ — $ — $ 136 $ — $ — $ 149 $ — $ — $ 43 Court ordered — 1 — — 74 — — 78 — — 27 — Commercial real estate: Maturity concession — — 1 — — 235 — — 235 — — — Commercial: Maturity concession 6 — — 2,973 — — 2,973 — — 1,400 — — Court ordered — — 3 — — 77 — — 77 — — 6 Home equity: Principal forgiveness and maturity — — 1 — — 40 — — 30 — — — Total 6 1 6 $ 2,973 $ 74 $ 488 $ 2,973 $ 78 $ 491 $ 1,400 $ 27 $ 49 loans that had been modified as a TDR within the previous 12 months and for which the borrower subsequently defaulted for the periods indicated
Summary of Impaired Loan Balances and Associated Allowance by Portfolio Segment	The following is a summary of impaired loan balances and the associated allowance by portfolio segment as of and for the year ended December 31, 2016 , 2015 and 2014 : Recorded Investment Unpaid Principal Balance Related Allowance Average Recorded Investment Interest Income Recognized December 31, 2016: With related allowance recorded: Residential real estate $ 3,019 $ 3,019 $ 483 $ 3,088 $ 106 Commercial real estate 11,443 11,443 1,373 5,165 — Commercial — — — 762 — Home equity 299 299 86 305 — Consumer — — — — — HPFC 97 97 65 98 — Ending Balance 14,858 14,858 2,007 9,418 106 Without related allowance recorded: Residential real estate 1,329 1,800 — 2,057 9 Commercial real estate 1,874 2,369 — 2,214 51 Commercial 2,028 3,209 — 2,507 16 Home equity 158 368 — 180 — Consumer 7 10 — 12 — HPFC — — — — — Ending Balance 5,396 7,756 — 6,970 76 Total impaired loans $ 20,254 $ 22,614 $ 2,007 $ 16,388 $ 182 December 31, 2015: With related allowance recorded: Residential real estate $ 3,191 $ 3,191 $ 544 $ 6,064 $ 112 Commercial real estate 1,825 1,857 644 1,753 — Commercial 156 156 92 945 2 Home equity 303 303 89 900 — Consumer — — — 195 — HPFC — — — — — Ending Balance 5,475 5,507 1,369 9,857 114 Without related allowance recorded: Residential real estate 2,835 4,353 — 2,175 8 Commercial real estate 2,785 3,426 — 2,719 65 Commercial 3,781 4,325 — 1,412 17 Home equity 285 688 — 369 — Consumer 74 150 — 20 — HPFC — — — — — Ending Balance 9,760 12,942 — 6,695 90 Total impaired loans $ 15,235 $ 18,449 $ 1,369 $ 16,552 $ 204 Recorded Investment Unpaid Principal Balance Related Allowance Average Recorded Investment Interest Income Recognized December 31, 2014: With related allowance recorded: Residential real estate $ 4,468 $ 4,468 $ 787 $ 9,254 $ 125 Commercial real estate 1,140 1,140 78 4,721 — Commercial 183 183 10 2,366 8 Home equity — — — 1,428 — Consumer 140 140 78 348 — Ending Balance 5,931 5,931 953 18,117 133 Without related allowance recorded: Residential real estate 1,943 2,604 — 2,257 7 Commercial real estate 4,239 4,502 — 2,869 40 Commercial 463 606 — 791 11 Home equity 331 581 — 399 — Consumer 17 37 — 21 — Ending Balance 6,993 8,330 — 6,337 58 Total impaired loans $ 12,924 $ 14,261 $ 953 $ 24,454 $ 191
Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]	The loan balances for each portfolio segment presented above are net of their respective unamortized fair value mark discount on acquired loans and net of unamortized loan origination (costs) fees totaling: December 31, 2016 2015 Net unamortized fair value mark discount on acquired loans $ 8,810 $ 13,083 Net unamortized loan origination (costs) fees (66 ) 370 Total $ 8,744 $ 13,453

Goodwill and Other Intangible36

Goodwill and Other Intangible Assets (Tables)	12 Months Ended
	Dec. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Goodwill	The changes in goodwill for the year ended December 31, 2016 and 2015 for each reporting unit are shown in the table below: Banking Financial Services Total December 31, 2014: Goodwill $ 40,902 $ 7,474 $ 48,376 Accumulated impairment losses — (3,570 ) (3,570 ) Reported goodwill 40,902 3,904 44,806 2015 activity (1) 50,851 — 50,851 December 31, 2015: Goodwill 91,753 7,474 99,227 Accumulated impairment losses — (3,570 ) (3,570 ) Reported goodwill 91,753 3,904 95,657 2016 activity (1) (960 ) — (960 ) December 31, 2016: Goodwill 90,793 7,474 98,267 Accumulated impairment losses — (3,570 ) (3,570 ) Reported goodwill $ 90,793 $ 3,904 $ 94,697 (1) On October 16, 2015, the Company completed the Merger and goodwill of $49.9 million after recording a measurement-period adjustment decreasing goodwill of $960,000 in 2016 upon completion of purchase accounting. Refer to Note 2 for additional details and discussion.

Other Intangible Assets (Tables

Other Intangible Assets (Tables)	12 Months Ended
	Dec. 31, 2016
Other Intangible Assets [Abstract]
Schedule of Finite-Lived Intangible Assets	The changes in core deposit intangible and trust relationship intangible assets for the year ended December 31, 2016 and 2015 are shown in the table below: Core Deposit Intangible Trust Relationship Intangible Gross Accumulated Amortization Net Gross Accumulated Amortization Net Total Balance at December 31, 2014 $ 17,300 $ (14,161 ) $ 3,139 $ 753 $ (527 ) $ 226 $ 3,365 2015 activity 6,608 (1,231 ) 5,377 — (75 ) (75 ) 5,302 Balance at December 31, 2015 23,908 (15,392 ) 8,516 753 (602 ) 151 8,667 2016 activity — (1,828 ) (1,828 ) — (75 ) (75 ) (1,903 ) Balance at December 31, 2016 $ 23,908 $ (17,220 ) $ 6,688 $ 753 $ (677 ) $ 76 $ 6,764 The following table reflects the expected amortization schedule for intangible assets over the period of estimated economic benefit (assuming no additional intangible assets are created or impaired): Core Deposit Intangible Trust Relationship Intangible Total 2017 $ 1,735 $ 76 $ 1,811 2018 725 — 725 2019 705 — 705 2020 682 — 682 2021 655 — 655 Thereafter 2,186 — 2,186 Total $ 6,688 $ 76 $ 6,764

Premises and Equipment (Tables)

Premises and Equipment (Tables)	12 Months Ended
	Dec. 31, 2016
Property, Plant and Equipment [Line Items]
Schedule of Premises and Equipment	Details of premises and equipment, at cost, at December 31, were as follows: 2016 2015 Land and land improvements $ 3,012 $ 3,102 Buildings and leasehold improvements 36,958 37,926 Furniture, fixtures and equipment 34,043 35,083 Total cost 74,013 76,111 Accumulated depreciation and amortization (31,140 ) (30,152 ) Net premises and equipment $ 42,873 $ 45,959 Depreciation and amortization expense for the Company for periods indicated were as follows: For The Year Ended December 31, Fixed Asset Type Income Statement Line Item 2016 2015 2014 Equipment and data Furniture, equipment and data processing $ 1,942 $ 1,620 $ 1,713 Premises Net occupancy costs 1,757 1,140 1,003 Software Furniture, equipment and data processing 275 337 335 Equipment, data and premises Merger and acquisition costs 452 517 — Total $ 4,426 $ 3,614 $ 3,051
Schedule of Capital and Operating Lease Obligations	At December 31, 2016 , under current operating and capital lease contracts, the Company had the following schedule of future minimum lease payments: Operating Capital 2017 $ 1,427 $ 126 2018 1,186 126 2019 1,144 126 2020 644 126 2021 447 130 Thereafter 1,783 555 Total minimum lease payments $ 6,631 1,189 Less: amount representing interest (1) 331 Present value of net minimum lease payments (2) $ 858 (1) Amount necessary to reduce net minimum lease payments to present value calculated at the Company's incremental borrowing rate at lease inception. (2) Reflects the liability reported within short- and long-term borrowings on the consolidated statements of condition. At December 31, 2016 and 2015 , the capital lease liability was $858,000 and $922,000 , respectively.

Mortgage Servicing (Tables)

Mortgage Servicing (Tables)	12 Months Ended
	Dec. 31, 2016
Transfers and Servicing [Abstract]
Schedule of Mortgage Servicing Rights Capitalized and Amortized	The following summarizes MSRs capitalized and amortized, along with the activity in the related valuation allowance: As of and For The Year Ended December 31, 2016 2015 2014 MSRs: Balance at beginning of year $ 2,161 $ 493 $ 726 Capitalized servicing right fees upon sale (1) 9 294 15 Acquired in connection with SBM acquisition, at fair value — 1,608 — Amortization charged against mortgage servicing fee income (1) (734 ) (231 ) (262 ) Valuation adjustment (226 ) (3 ) 14 Balance at end of year $ 1,210 $ 2,161 $ 493 Valuation Allowance: Balance at beginning of year $ (4 ) $ (1 ) $ (15 ) (Increase) decrease in impairment reserve (1) (226 ) (3 ) 14 Balance at end of year $ (230 ) $ (4 ) $ (1 ) Fair value, beginning of year (2) $ 2,947 $ 1,447 $ 1,494 Fair value, end of year (2) $ 1,701 $ 2,947 $ 1,447 (1) Reported within mortgage banking income, net on the Company's consolidated statements of income. (2) Reported fair value represents all MSRs currently being serviced by the Company.

Deposits (Tables)

Deposits (Tables)	12 Months Ended
	Dec. 31, 2016
Deposits [Abstract]
Schedule Of Deposit Maturities	The following is a summary of scheduled maturities of CDs as of December 31, 2016 : Retail Brokered Total 2017 $ 230,853 $ 34,939 $ 265,792 2018 89,497 — 89,497 2019 54,453 — 54,453 2020 47,776 7,000 54,776 2021 32,260 — 32,260 Thereafter 13,364 — 13,364 Total $ 468,203 $ 41,939 $ 510,142

Borrowings (Tables)

Borrowings (Tables)	12 Months Ended
	Dec. 31, 2016
Debt Disclosure [Abstract]
Federal Home Loan Bank, Advances [Table Text Block]	At December 31, 2016, the terms of the Company's outstanding FHLBB borrowings were as follows: Balance Sheet Classification Outstanding Balance Maturity Date Interest Rate Range Next Call Date Call Amount Short-Term Borrowings $ 190,000 January 2017 0.73% - 0.84% N/A — Short-Term Borrowings 20,000 July 2017 3.99% - 4.06% January 2017 $ 20,000 Long-Term Borrowings $ 10,000 April 2020 1.87% N/A —
Schedule of Borrowed Funds Outstanding	The following table summarizes short term and long term borrowings as presented on the consolidated statements of condition at: December 31, 2016 2015 Short-Term Borrowings (mature within one year): Customer repurchase agreements $ 225,605 $ 184,989 FHLBB borrowings 210,000 255,000 FHLBB and correspondent bank overnight borrowings 89,450 12,800 Wholesale repurchase agreements 5,007 25,000 Capital lease obligation 67 63 Total short-term borrowings $ 530,129 $ 477,852 Long-Term Borrowings (maturity greater than one year) : FHLBB borrowings $ 10,000 $ 30,000 Capital lease obligation 791 859 Wholesale repurchase agreements — 5,052 Total long-term borrowings $ 10,791 $ 35,911
Schedule of Amounts Outstanding and Interest Rates of Short-term Borrowings	The table below provides information on the Company's borrowings classified as short-term for the dates indicated: December 31, 2016 2015 Balance outstanding at end of year $ 530,129 $ 477,852 Weighted average interest rate 0.74 % 0.57 %

Repurchase Agreements (Tables)

Repurchase Agreements (Tables)	12 Months Ended
	Dec. 31, 2016
Banking and Thrift [Abstract]
Schedule of Underlying Assets of Repurchase Agreements when Amount of Repurchase Agreements Exceeds 10 Percent of Assets	The tables below sets forth information regarding the Company’s repurchase agreements accounted for as secured borrowings and types of collateral at December 31, 2016 and 2015 : Remaining Contractual Maturity of the Agreements Overnight and Continuous Up to 30 Days 30 - 90 Days Greater than 90 Days Total December 31, 2016 Customer Repurchase Agreements: Mortgage-backed securities issued or guaranteed by U.S. government-sponsored enterprises $ 117,784 $ — $ — $ — $ 117,784 Collateralized mortgage obligations issued or guaranteed by U.S. government-sponsored enterprises 107,821 — — — 107,821 Total Customer Repurchase Agreements 225,605 — — — 225,605 Wholesale Repurchase Agreements: Mortgage-backed securities issued or guaranteed by U.S. government-sponsored enterprises — — 3,715 — 3,715 Collateralized mortgage obligations issued or guaranteed by U.S. government-sponsored enterprises — — 1,292 — 1,292 Total Wholesale Repurchase Agreements — — 5,007 — 5,007 Total Repurchase Agreements (1) $ 225,605 $ — $ 5,007 $ — $ 230,612 (1) Total repurchase agreements are presented within short-term borrowings on the consolidated statements of condition. Remaining Contractual Maturity of the Agreements Overnight and Continuous Up to 30 Days 30 - 90 Days Greater than 90 Days Total December 31, 2015 Customer Repurchase Agreements: Obligations of states and political subdivisions $ 556 $ — $ — $ — $ 556 Mortgage-backed securities issued or guaranteed by U.S. government-sponsored enterprises 95,967 — — — 95,967 Collateralized mortgage obligations issued or guaranteed by U.S. government-sponsored enterprises 88,466 — — — 88,466 Total Customer Repurchase Agreements 184,989 — — — 184,989 Wholesale Repurchase Agreements: Mortgage-backed securities issued or guaranteed by U.S. government-sponsored enterprises — — — 22,016 22,016 Collateralized mortgage obligations issued or guaranteed by U.S. government-sponsored enterprises — — — 8,036 8,036 Total Wholesale Repurchase Agreements — — — 30,052 30,052 Total Repurchase Agreements (1) $ 184,989 $ — $ — $ 30,052 $ 215,041 (1) Total repurchase agreements are presented within short- and long-term borrowings on the consolidated statements of condition.

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Schedule of Income Tax Expense	The current and deferred components of income tax expense on the consolidated statements of income were as follows: For The Year Ended December 31, 2016 2015 2014 Current: Federal $ 17,854 $ 7,956 $ 11,435 State 930 71 505 18,784 8,027 11,940 Deferred: Federal (1,258 ) 1,356 (500 ) State (54 ) 524 — (1,312 ) 1,880 (500 ) Income tax expense $ 17,472 $ 9,907 $ 11,440
Reconciliation of Expected Income Tax Benefit Computed Using Federal Statutory Income Tax Rate	The income tax expense differs from the amount computed by applying the statutory federal income tax rate as a result of the following: For The Year Ended December 31, 2016 2015 2014 Computed tax expense $ 20,139 $ 10,801 $ 12,604 Increase (reduction) in income taxes resulting from: Tax exempt income (1,312 ) (1,092 ) (704 ) Income from life insurance (908 ) (588 ) (503 ) Share-based awards (1) (701 ) — — State taxes, net of federal benefit 565 373 328 Low income housing credits (376 ) (359 ) (286 ) Non-deductible acquisition-related costs — 467 — Other 65 305 1 Income tax expense $ 17,472 $ 9,907 $ 11,440 Income before income taxes $ 57,539 $ 30,859 $ 36,010 Effective tax rate 30.4 % 32.1 % 31.8 %
Schedule of Deferred Tax Assets and Deferred Tax Liabilities	Temporary differences between the financial statements carrying amounts and the tax bases of assets and liabilities gave rise to the following deferred tax assets and liabilities: December 31, 2016 2015 (Calculated using a 35% deferred income tax rate) Asset Liability Asset Liability Net operating loss and tax credit carryforward $ 20,977 $ — $ 22,282 $ — Allowance for loan losses 8,094 — 7,416 — Pension and other benefits 5,141 — 4,488 — Net unrealized losses on AFS securities 3,227 — 2,047 — Net unrealized losses on derivative instruments 3,066 — 3,432 — Purchase accounting and deposit premium 1,430 — 2,856 — Deferred compensation and benefits 1,791 — 2,129 — Net unrealized losses on postretirement plans 1,147 — 1,102 — Depreciation — (4,520 ) — (4,298 ) Deferred loan origination fees — (2,046 ) — (1,815 ) Other 956 — 77 — 45,829 (6,566 ) 45,829 (6,113 ) Valuation allowance on deferred tax assets — — Net deferred tax assets $ 39,263 $ 39,716

Earnings Per Share (Tables)

Earnings Per Share (Tables)	12 Months Ended
	Dec. 31, 2016
Earnings Per Share [Abstract]
Computation of Basic and Diluted Earnings Per Share	The following is an analysis of basic and diluted EPS, reflecting the application of the two-class method, as described below: For The Year Ended December 31, 2016 2015 2014 Net income $ 40,067 $ 20,952 $ 24,570 Dividends and undistributed earnings allocated to participating securities (1) (189 ) (59 ) (75 ) Net income available to common shareholders $ 39,878 $ 20,893 $ 24,495 Weighted-average common shares outstanding for basic EPS (2) 15,422,160 12,031,294 11,176,468 Dilutive effect of stock-based awards (2)(3) 82,079 43,285 29,420 Weighted-average common and potential common shares for diluted EPS (2) 15,504,239 12,074,579 11,205,888 Earnings per common share (2) : Basic EPS $ 2.59 $ 1.73 $ 2.19 Diluted EPS $ 2.57 $ 1.73 $ 2.19 Awards excluded from the calculation of diluted EPS (2) (4) : Stock options — 19,875 20,625 (1) Represents dividends paid and undistributed earnings allocated to nonvested stock-based awards that contain non-forfeitable rights to dividends. (2) Share and per share amounts have been adjusted to reflect the three-for-two split effective September 30, 2016, for all periods presented. Refer to Note 13. (3) Represents the effect of the assumed exercise of stock options, vesting of restricted shares, vesting of restricted stock units, and vesting of LTIP awards that have met the performance criteria, utilizing the treasury stock method. (4) Represents stock-based awards not included in the computation of potential common shares for purposes of calculating diluted EPS as the exercise prices were greater than the average market price of the Company's common stock

Employee Benefit Plans (Tables)

Employee Benefit Plans (Tables)	12 Months Ended
	Dec. 31, 2016
Compensation and Retirement Disclosure [Abstract]
Schedule of Changes in Benefit Obligation and Plan Assets	The following table summarizes changes in the benefit obligation and plan assets for (i) SERP and (ii) the other postretirement benefit plan as of December 31, 2016 and 2015 : SERP Other Postretirement Benefits 2016 2015 2016 2015 Benefit obligations: Beginning of year $ 11,052 $ 10,834 $ 3,447 $ 2,997 Service cost 308 307 59 62 Interest cost 432 424 151 117 Actuarial (gain) loss 219 (32 ) 143 92 Business combinations (1) — — — 312 Benefits paid (488 ) (481 ) (165 ) (133 ) End of year 11,523 11,052 3,635 3,447 Fair value of plan assets: Beginning of year — — — — Employer contributions 488 481 165 133 Benefits paid (488 ) (481 ) (165 ) (133 ) End of year — — — — Funded status at end of year (2) $ 11,523 $ 11,052 $ 3,635 $ 3,447 Amounts recognized in AOCI, net of tax: Net actuarial loss $ 1,791 $ 1,789 $ 495 $ 423 Prior service cost (credit) — 5 (156 ) (170 ) Total $ 1,791 $ 1,794 $ 339 $ 253 (1) In connection with the Merger, the Company assumed its post-retirement benefits for certain former employees and their spouses whereby the Company will cover 100% of healthcare premiums. (2) Reported within other liabilities on the consolidated statements of condition.
Schedule of Net Period Benefit Cost and Other Amounts Recognized in Other Comprehensive Income	The components of net period benefit cost and other amounts recognized in OCI, before taxes, were as follows: SERP Other Postretirement Benefits 2016 2015 2014 2016 2015 2014 Net period benefit cost: Service cost $ 308 $ 307 $ 270 $ 59 $ 62 $ 45 Interest cost 432 424 456 151 117 132 Recognized net actuarial loss 220 218 140 30 24 10 Amortization of prior service cost (credit) 7 19 19 (22 ) (22 ) (22 ) Net period benefit cost 967 968 885 218 181 165 Changes in funded status recognized in OCI, before taxes: Net actuarial (gain) loss 219 (32 ) 777 143 92 (134 ) Reclassifications to net period benefit cost: Amortization of net unrecognized actuarial loss (220 ) (218 ) (140 ) (30 ) (24 ) (10 ) Amortization of prior service (cost) credit (7 ) (19 ) (19 ) 22 22 22 Total recognized in OCI, before taxes (8 ) (269 ) 618 135 90 (122 ) Total recognized in net period benefit cost and OCI, before taxes $ 959 $ 699 $ 1,503 $ 353 $ 271 $ 43
Schedule of Assumptions Used in Determining Benefit Obligations and Net Period Benefit Costs	The following assumptions were used in determining benefit obligations and net period benefit costs: SERP Other Postretirement Benefits 2016 2015 2014 2016 2015 2014 Weighted-average assumptions as of end of year: Discount rate for benefit obligation 4.00 % 4.00 % 4.00 % 4.00 % 4.50 % 4.00 % Discount rate for net period benefit cost 4.00 % 4.00 % 4.75 % 4.50 % 4.00 % 5.02 % Rate of compensation increase for benefit obligation 4.00 % 4.00 % 4.00 % — — — Rate of compensation increase for net periodic benefit cost 4.00 % 4.00 % 4.50 % — — — Health care cost trend rate assumed for future years — — — 7.00 % 7.00 % 7.00 %
Schedule of Estimated Future Benefit Payments	The expected benefit payments for the next ten years are presented in the following table: SERP Other Postretirement Benefits 2017 475 156 2018 473 163 2019 477 166 2020 486 169 2021 542 182 2022-2026 3,127 1,043

Stock-Based Compensation Plans

Stock-Based Compensation Plans (Tables)	12 Months Ended
	Dec. 31, 2016
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Schedule of Option Pricing Assumptions and Estimated Fair Value	The following table presents the option pricing assumptions and the estimated fair value of the options using these assumptions for grants made for the year ended: December 31, 2016 2015 2014 Weighted-average dividend yield 3.12 % 3.01 % 2.90 % Weighted-average risk-free interest rate 1.52 % 1.50 % 1.65 % Weighted-average expected volatility 29.64 % 31.85 % 35.39 % Weighted-average expected life (in years) 5.3 5.3 5.3 Weighted-average fair value of options granted $ 5.17 $ 5.87 $ 5.95
Schedule of Stock Option Activity	Stock option activity for the year ended December 31, 2016 is as follows: Number of Shares (1) Weighted-Average Exercise Price Weighted-Average Remaining Contractual Term Aggregate Intrinsic Value Options outstanding at January 1, 2016 219,399 $ 16.93 Granted 3,000 25.64 Exercised (157,956 ) 15.53 Forfeited and expired (5,700 ) 22.93 Options outstanding at December 31, 2016 58,743 $ 20.38 3.82 $ 1,558 Options exercisable at December 31, 2016 49,293 $ 19.62 3.91 $ 1,224
Summary of Nonvested Stock Options	A summary of the status of the Company’s nonvested stock options as of December 31, 2016 and changes during the year then ended is presented below: Awards Weighted-Average Grant Date Fair Value Nonvested at January 1, 2016 17,351 $ 7.40 Granted 3,000 5.17 Vested (7,751 ) 8.13 Forfeited (3,150 ) 5.92 Nonvested at December 31, 2016 9,450 $ 6.59
Summary of Activity Related to Restricted Stock Awards and Stock Purchase Grants	The following table presents a summary of the activity related to restricted stock, restricted stock units and MSPP for the period indicated: Restricted Stock and Restricted Stock Units MSPP Number of Shares Weighted-Average Grant Date Fair Value Number of Shares Weighted-Average Grant Date Fair Value Nonvested at January 1, 2016 38,391 $ 27.09 18,800 $ 7.85 Granted 32,016 28.88 16,000 8.02 Vested (22,000 ) 27.40 (6,988 ) 8.21 Forfeited (894 ) 26.55 (1,113 ) 8.10 Nonvested at December 31, 2016 47,513 $ 28.16 26,699 $ 7.85
Summary of Activity Related to Long-term Performance Share Plan	The following table presents a summary of the activity related to LTIP for the period indicated: Number of Shares Weighted-Average Grant Date Fair Value Nonvested at January 1, 2016 64,165 $ 26.71 Granted 17,385 28.87 Vested (26,396 ) 27.45 Forfeited (2,417 ) 27.45 Nonvested at December 31, 2016 52,737 $ 27.01
Restricted Stock Awards and Management Stock Purchase Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Schedule of Compensation Expense	Compensation expense recognized in connection with the restricted stock units, restricted stock awards, and MSPP is presented in the following table: For The Year Ended 2016 2015 2014 Restricted stock and restricted stock units $ 703 $ 327 $ 254 MSPP 102 66 67 Total compensation expense $ 805 $ 393 $ 321 Related income tax benefit $ 282 $ 137 $ 112 Fair value of grants vested $ 660 $ 433 $ 332
Long-Term Performance Share Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Schedule of Compensation Expense	Compensation expense recognized in connection with the LTIP is presented in the following table: For The Year Ended 2016 2015 2014 Compensation expense (1) $ 1,080 $ 330 $ 151 Related income tax benefit $ 378 $ 116 $ 53 Fair value of grants vested $ 725 $ 412 $ —

Other Non-Interest Expenses (Ta

Other Non-Interest Expenses (Tables)	12 Months Ended
	Dec. 31, 2016
Other Noninterest Expenses [Abstract]
Other Non Interest Expense Disclosure [Text Block]	Detail of other income included in the consolidated statements of income is as follows: For The Year Ended December 31, 2016 2015 2014 Customer loan swap fee income (1) $ 2,104 $ 1,514 $ 480 Other income 4,830 2,363 2,600 Total $ 6,934 $ 3,877 $ 3,080 Other Non-Interest Income and Expenses Detail of other income included in the consolidated statements of income is as follows: For The Year Ended December 31, 2016 2015 2014 Customer loan swap fee income (1) $ 2,104 $ 1,514 $ 480 Other income 4,830 2,363 2,600 Total $ 6,934 $ 3,877 $ 3,080 (1) Fee income recognized upon completion of customer loan swaps. Refer to Note 18 for further discussion. Detail of other expenses included in the consolidated statements of income is as follows: For The Year Ended December 31, 2016 2015 2014 Postage, freight, and courier $ 1,754 $ 1,430 $ 1,236 Donations and marketing 1,660 1,841 1,587 Employee-related costs (1) 1,616 1,437 1,287 Other expenses 5,657 4,502 3,735 Total $ 10,687 $ 9,210 $ 7,845 (1) Employee-related costs include hiring, training, education, meeting and business travel costs.
Schedule of Other Non-Interest Expenses	Detail of other expenses included in the consolidated statements of income is as follows: For The Year Ended December 31, 2016 2015 2014 Postage, freight, and courier $ 1,754 $ 1,430 $ 1,236 Donations and marketing 1,660 1,841 1,587 Employee-related costs (1) 1,616 1,437 1,287 Other expenses 5,657 4,502 3,735 Total $ 10,687 $ 9,210 $ 7,845 (1) Employee-related costs include hiring, training, education, meeting and business travel costs.

Commitments And Contingencies (

Commitments And Contingencies (Tables)	12 Months Ended
	Dec. 31, 2016
Derivatives, Fair Value [Line Items]
Summary of Contractual and Notional Amounts of Financial Instruments	The following is a summary of the contractual and notional amounts of the Company’s financial instruments: December 31, 2016 2015 Lending-Related Instruments: Loan origination commitments and unadvanced lines of credit: Home equity $ 454,225 $ 464,701 Commercial and commercial real estate 83,103 94,791 Residential 17,795 16,256 Letters of credit 2,580 4,468 Other commitments 432 433 Derivative Financial Instruments: Customer loan swaps 532,526 285,888 FHLBB advance interest rate swaps 50,000 50,000 Junior subordinated debt interest rate swaps 43,000 43,000 Interest rate lock commitments 15,249 20,735 Forward delivery commitments 15,125 —
Summary of Contractual and Notional Amounts of Company's Financial Instruments	The details of its interest rate swap agreements are outlined in the table below: December 31, 2016 2015 Notional Amount Trade Date Maturity Date Variable Index Received Fixed Rate Paid Fair Value (1) Fair Value (1) $ 10,000 3/18/2009 6/30/2021 3-Month USD LIBOR 5.09% $ (806 ) $ (1,038 ) 10,000 7/8/2009 6/30/2029 3-Month USD LIBOR 5.84% (2,321 ) (2,537 ) 10,000 5/6/2010 6/30/2030 3-Month USD LIBOR 5.71% (2,290 ) (2,477 ) 5,000 3/14/2011 3/30/2031 3-Month USD LIBOR 4.35% (1,211 ) (1,301 ) 8,000 5/4/2011 7/7/2031 3-Month USD LIBOR 4.14% (1,744 ) (1,876 ) $ 43,000 $ (8,372 ) $ (9,229 ) (1) Presented within accrued interest and other liabilities on the consolidated statements of condition. December 31, 2016 2015 Notional Trade Maturity Date Variable Index Fixed Rate Fair Value (1) Fair Value (1) $ 25,000 2/25/2015 2/25/2018 1-Month USD LIBOR 1.54% $ (152 ) $ (230 ) 25,000 2/25/2015 2/25/2019 1-Month USD LIBOR 1.74% (237 ) (346 ) $ 50,000 $ (389 ) $ (576 ) The Company's forward delivery commitments on loans held for sale was as follows for the periods indicated: December 31, 2016 2015 Balance Sheet Location Notional Fair Value Notional Fair Value Forward delivery commitments ("best-effort") Other assets $ 14,250 $ 587 $ — $ — Forward delivery commitments ("best-effort") Accrued interest and other liabilities 875 (309 ) — — Total $ 15,125 $ 278 $ — $ —
Schedule of Interest Rate Derivatives	Our pipeline of mortgage loans with fixed-rate interest rate lock commitments were as follows for the periods indicated: December 31, 2016 2015 Balance Sheet Location Notional Fair Value Notional Fair Value Fixed-rate mortgage interest rate locks Other assets $ 12,310 $ 202 $ 12,669 $ 229 Fixed-rate mortgage interest rate locks Accrued interest and other liabilities 2,939 (15 ) 8,066 (90 ) Total $ 15,249 $ 187 $ 20,735 $ 139 The following table presents the total positions, notional and fair value of the Bank's customer loans swaps with its commercial customers and the corresponding interest rate swap agreements with counterparty for the periods indicated: December 31, 2016 2015 Balance Sheet Location Number of Positions Notional Fair Value Number of Positions Notional Fair Value Receive fixed, pay variable Other assets / (accrued interest and other liabilities) 50 $ 266,263 $ (1,945 ) 28 $ 142,944 $ 3,166 Pay fixed, received variable Other assets / (accrued interest and other liabilities) 50 266,263 1,945 28 142,944 (3,166 ) Total 100 $ 532,526 $ — 56 $ 285,888 $ —
Schedule of Derivative Instruments, Effect on Other Comprehensive Income (Loss)	The table below presents the effect of the Company’s derivative financial instruments included in OCI and current earnings for the periods indicated: For The Year Ended 2016 2015 2014 Derivatives designated as cash flow hedges Effective portion of unrealized losses recognized within AOCI during the period, net of tax $ (637 ) $ (1,533 ) $ (4,515 ) Net reclassification adjustment for effective portion of cash flow hedges included in interest expense, gross (1) $ 2,026 $ 1,695 $ 1,714

Fair Value (Tables)

Fair Value (Tables)	12 Months Ended
	Dec. 31, 2016
Fair Value Disclosures [Abstract]
Summary of Financial Assets and Liabilities Measured at Fair Value on Recurring Basis	The following table summarizes financial assets and financial liabilities measured at fair value on a recurring basis as of December 31, 2016 and 2015 , segregated by the level of the valuation inputs within the fair value hierarchy utilized to measure fair value: Fair Value Readily Available Market Prices (Level 1) Observable Market Data (Level 2) Company Determined Fair Value (Level 3) December 31, 2016 Financial assets: Loans held for sale $ 14,836 $ — $ 14,836 $ — AFS securities: Obligations of states and political subdivisions 9,001 — 9,001 — Mortgage-backed securities issued or guaranteed by U.S. government-sponsored enterprises 480,622 — 480,622 — Collateralized mortgage obligations issued or guaranteed by U.S. government-sponsored enterprises 283,890 — 283,890 — Subordinated corporate bonds 5,613 — 5,613 — Equity securities 741 — 741 — Customer loan swaps 1,945 — 1,945 — Fixed-rate interest rate lock commitments 202 — 202 — Forward delivery commitments 587 — 587 — Financial liabilities: Junior subordinated debt interest rate swaps 8,372 — 8,372 — FHLBB advance interest rate swaps 389 — 389 — Customer loan swaps 1,945 — 1,945 — Fixed-rate interest rate lock commitments 15 — 15 — Forward delivery commitments 309 — 309 — December 31, 2015 Financial assets: Loans held for sale $ 10,958 $ — $ 10,958 $ — AFS securities: Obligations of U.S. government-sponsored enterprises 5,040 — 5,040 — Obligations of states and political subdivisions 17,694 — 17,694 — Mortgage-backed securities issued or guaranteed by U.S. government-sponsored enterprises 419,046 — 419,046 — Collateralized mortgage obligations issued or guaranteed by U.S. government-sponsored enterprises 306,857 — 306,857 — Subordinated corporate bonds 996 — 996 — Equity securities 705 — 705 — Customer loan swaps 3,166 — 3,166 — Fixed-rate interest rate lock commitments 229 — 229 — Financial liabilities: Junior subordinated debt interest rate swaps 9,229 — 9,229 — FHLBB advance interest rate swaps 576 — 576 — Customer loan swaps 3,166 — 3,166 — Fixed-rate interest rate lock commitments 90 — 90 —
Summary of Assets Measured at Fair Value on Non Recurring Basis	The table below highlights financial and non-financial assets measured and recorded at fair value on a non-recurring basis as of December 31, 2016 and 2015 : Fair Value Readily Available Market Prices (Level 1) Observable Market Data (Level 2) Company Determined Fair Value (Level 3) December 31, 2016 Financial assets: Collateral-dependent impaired loans $ 500 $ — $ — $ 500 MSRs (1) 1,090 — 1,090 — Non-financial assets: OREO 922 — — 922 December 31, 2015 Financial assets: Collateral-dependent impaired loans $ 1,971 $ — $ — $ 1,971 MSRs (1) 440 — 440 — Non-financial assets: OREO 1,304 — — 1,304 (1) Represents MSRs deemed to be impaired and a valuation allowance was established to carry at fair value at December 31, 2016 and 2015 .
Valuation Methodology and Unobservable Inputs for Level Three Assets Measured at Fair Value on Non Recurring Basis	The following table presents the valuation methodology and unobservable inputs for Level 3 assets measured at fair value on a non-recurring basis at December 31, 2016 and 2015 : Fair Value Valuation Methodology Unobservable input Discount Range (Weighted-Average) December 31, 2016 Collateral-dependent impaired loans: Partially charged-off $ 166 Market approach appraisal of collateral Management adjustment of appraisal 0% (0%) Estimated selling costs 0 - 10% (5%) Specifically reserved 334 Market approach appraisal of collateral Management adjustment of appraisal 0 - 50% (13%) Estimated selling costs 10% (10%) OREO 922 Market approach appraisal of collateral Management adjustment of appraisal 0 - 73% (7%) Estimated selling costs 10% (10%) December 31, 2015 Collateral-dependent impaired loans: Partially charged-off $ 399 Market approach appraisal of collateral Management adjustment of appraisal 0% (0%) Estimated selling costs 0 - 10% (7%) Specifically reserved 1,572 Market approach appraisal of collateral Management adjustment of appraisal 0 - 57% (45%) Estimated selling costs 10% (10%) OREO 1,304 Market approach appraisal of collateral Management adjustment of appraisal 0 - 43% (18%) Estimated selling costs 10% (10%)
Carrying Amounts and Estimated Fair Value for Financial Instrument Assets and Liabilities	The following table presents the carrying amounts and estimated fair value for financial instrument assets and liabilities at December 31, 2016 : Carrying Amount Fair Value Readily Available Market Prices (Level 1) Observable Market Prices (Level 2) Company Determined Market Prices (Level 3) Financial assets: Cash and due from banks $ 87,707 $ 87,707 $ 87,707 $ — $ — AFS securities 779,867 779,867 — 779,867 — HTM securities 94,609 94,596 — 94,596 — Loans held for sale 14,836 14,836 — 14,836 — Residential real estate loans (1) 798,334 800,122 — — 800,122 Commercial real estate loans (1) 1,038,626 1,006,249 — — 1,006,249 Commercial loans (1)(2) 389,624 391,493 — — 391,493 Home equity loans (1) 327,713 327,292 — — 327,292 Consumer loans (1) 17,151 16,845 — — 16,845 MSRs (3) 1,210 1,701 — 1,701 — Interest receivable 8,654 8,654 — 8,654 — Customer loan swaps 1,945 1,945 — 1,945 — Fixed-rate interest rate lock commitments 202 202 — 202 — Forward delivery commitments 587 587 — 587 — Financial liabilities: Deposits $ 2,828,529 $ 2,826,484 $ — $ 2,826,484 $ — Short-term borrowings 530,129 530,435 — 530,435 — Long-term borrowings 10,791 10,836 — 10,836 — Subordinated debentures 58,755 41,660 — 41,660 — Interest payable 534 534 — 534 — Junior subordinated debt interest rate swaps 8,372 8,372 — 8,372 — Forward-starting interest rate swaps 389 389 — 389 — Customer loan swaps 1,945 1,945 — 1,945 — Fixed-rate interest rate lock commitments 15 15 — 15 — Forward delivery commitments 309 309 — 309 — (1) The presented carrying amount is net of the allocated ALL. (2) Includes the HPFC loan portfolio. (3) Reported fair value represents all MSRs currently being serviced by the Company at December 31, 2016 . The following table presents the carrying amounts and estimated fair value for financial instrument assets and liabilities at December 31, 2015 : Carrying Amount Fair Value Readily Available Market Prices (Level 1) Observable Market Prices (Level 2) Company Determined Market Prices (Level 3) Financial assets: Cash and due from banks $ 79,488 $ 79,488 $ 79,488 $ — $ — AFS securities 750,338 750,338 — 750,338 — HTM securities 84,144 85,647 — 85,647 — Loans held for sale 10,958 10,958 — 10,958 — Residential real estate loans (1) 808,180 820,774 — — 820,774 Commercial real estate loans (1) 922,257 911,316 — — 911,316 Commercial loans (1)(2) 371,684 371,854 — — 371,854 Home equity loans (1) 349,215 348,963 — — 348,963 Consumer loans (1) 17,704 18,163 — — 18,163 MSRs (3) 2,161 2,947 — 2,947 — Interest receivable 7,985 7,985 — 7,985 — Customer loan swaps 3,166 3,166 — 3,166 — Fixed-rate interest rate lock commitments 229 229 — 229 — Financial liabilities: Deposits $ 2,726,379 $ 2,726,300 $ — $ 2,726,300 $ — Short-term borrowings 477,852 479,403 — 479,403 — Long-term borrowings 35,911 36,307 — 36,307 — Subordinated debentures 58,599 42,950 — 42,950 — Interest payable 641 641 — 641 — Junior subordinated debt interest rate swaps 9,229 9,229 — 9,229 — Forward-starting interest rate swaps 576 576 — 576 — Customer loan swaps 3,166 3,166 — 3,166 — Fixed-rate interest rate lock commitments 90 90 — 90 — (1) The presented carrying amount is net of the allocated ALL. (2) Includes the HPFC loan portfolio. (3) Reported fair value represents all MSRs currently being serviced by the Company at December 31, 2015 .

Regulatory Capital Requiremen50

Regulatory Capital Requirements (Tables)	12 Months Ended
	Dec. 31, 2016
Regulatory Capital Requirements [Abstract]
Schedule of Compliance with Regulatory Capital Requirements	The following table presents the Company and Bank's regulatory capital ratios at the periods indicated: December 31, Minimum Regulatory Capital Required for Capital Adequacy plus Capital Conservation Buffer Minimum Regulatory Provision To Be "Well Capitalized" Under Prompt Corrective Action Provisions December 31, Minimum Regulatory Capital Required For Capital Adequacy Purposes Minimum Regulatory Provision To Be "Well Capitalized" Under Prompt Corrective Action Provisions Amount Ratio Amount Ratio Camden National Corporation: Total risk-based capital ratio $ 368,856 14.04 % 8.63 % N/A $ 335,740 12.98 % 8.00 % N/A Tier I risk-based capital ratio 330,729 12.59 % 6.63 % N/A 299,552 11.58 % 6.00 % N/A Common equity Tier I risk-based capital ratio 296,120 11.27 % 5.13 % N/A 269,350 10.42 % 4.50 % N/A Tier I leverage capital ratio 330,729 8.83 % 4.00 % N/A 299,552 8.74 % 4.00 % N/A Camden National Bank: Total risk-based capital ratio $ 340,908 12.92 % 8.63 % 10.00 % $ 304,847 11.75 % 8.00 % 10.00 % Tier I risk-based capital ratio 317,782 12.05 % 6.63 % 8.00 % 283,659 10.93 % 6.00 % 8.00 % Common equity Tier I risk-based capital ratio 317,782 12.05 % 5.13 % 6.50 % 283,659 10.93 % 4.50 % 6.50 % Tier I leverage capital ratio 317,782 8.54 % 4.00 % 5.00 % 283,659 8.33 % 4.00 % 5.00 %

Parent Company Financial Stat51

Parent Company Financial Statements (Tables)	12 Months Ended
	Dec. 31, 2016
Condensed Financial Information of Parent Company Only Disclosure [Abstract]
Condensed Statements of Condition	Following are the condensed statements of condition, income and cash flows for the Company's parent company: STATEMENTS OF CONDITION December 31, 2016 2015 ASSETS Cash $ 29,905 $ 26,581 Investment in subsidiaries: Bank 429,100 394,404 Acadia Trust (1) — 10,232 Receivable from subsidiaries 107 1,926 Other assets 12,420 13,939 Total assets $ 471,532 $ 447,082 LIABILITIES AND SHAREHOLDERS’ EQUITY Subordinated debentures $ 58,755 $ 58,590 Due to subsidiaries 37 1,216 Other liabilities 21,193 24,086 Shareholders’ equity 391,547 363,190 Total liabilities and shareholders’ equity $ 471,532 $ 447,082
Condensed Statements of Income	STATEMENTS OF INCOME For The Year Ended December 31, 2016 2015 2014 Operating Income Dividend income from subsidiaries $ 16,000 $ 39,200 $ 12,800 Other income (loss) 239 (18 ) 104 Total operating income 16,239 39,182 12,904 Operating Expenses Interest on borrowings 3,415 2,734 2,532 Fees to Bank 160 160 160 Other operating expenses 748 469 453 Total operating expenses 4,323 3,363 3,145 Income before equity in undistributed earnings of subsidiaries and income taxes 11,916 35,819 9,759 Equity in undistributed income (losses) of subsidiaries 26,773 (15,999 ) 13,799 Income before income taxes 38,689 19,820 23,558 Income tax benefit 1,378 1,132 1,012 Net Income $ 40,067 $ 20,952 $ 24,570
Condensed Statements of Cash Flows	STATEMENTS OF CASH FLOWS For The Year Ended December 31, 2016 2015 2014 Operating Activities Net income $ 40,067 $ 20,952 $ 24,570 Adjustments to reconcile net income to net cash provided by operating activities: Equity in undistributed (income) losses of subsidiaries (26,651 ) 4,573 (13,799 ) Gain on sale of investment securities (4 ) — — (Increase) decrease in receivable from subsidiaries 1,819 (1,901 ) 2,037 (Increase) decrease in other assets 1,213 (2,175 ) 165 Increase (decrease) in due to subsidiaries (1,179 ) 1,216 — Increase (decrease) in other liabilities (2,519 ) 320 (2,106 ) Net cash provided by operating activities 12,746 22,985 10,867 Investing Activities Acquisition of SBM, net of cash acquired — (25,319 ) — Proceeds from sale of investment securities 80 — — Proceeds from sale of assets — — 5,237 Net cash provided by (used in) investing activities 80 (25,319 ) 5,237 Financing Activities Issuance of subordinated debt, net of issuance costs — 14,464 — Exercise of stock options and issuance of restricted stock, net of repurchase for tax withholdings and tax benefit 894 753 328 Capital contribution from subsidiaries 1,997 836 599 Equity issuance costs — (612 ) — Common stock repurchase — — (7,475 ) Cash dividends paid on common stock and cash in-lieu paid for fractional shares due to stock split (12,393 ) (9,785 ) (8,085 ) Net cash provided by (used in) financing activities (9,502 ) 5,656 (14,633 ) Net increase in cash 3,324 3,322 1,471 Cash at beginning of year 26,581 23,259 21,788 Cash at end of year $ 29,905 $ 26,581 $ 23,259

Quarterly Results of Operatio52

Quarterly Results of Operations (Tables)	12 Months Ended
	Dec. 31, 2016
Quarterly Financial Information Disclosure [Abstract]
Schedule of Quarterly Results of Operations	The following table presents a summary of the quarterly results of operations for the year ended: December 31, 2016 2015 First Quarter (1) Second Quarter Third Quarter Fourth Quarter First Quarter Second Quarter Third Quarter Fourth Quarter (2) Interest income $ 31,981 $ 32,775 $ 32,594 $ 32,276 $ 22,448 $ 23,657 $ 23,056 $ 29,983 Interest expense 4,029 4,271 4,222 4,032 3,014 3,022 3,044 3,612 Net interest income 27,952 28,504 28,372 28,244 19,434 20,635 20,012 26,371 Provision for credit losses 872 2,852 1,279 255 446 254 279 957 Non-interest income 7,917 10,552 11,001 10,151 6,147 6,310 6,561 8,464 Non-interest expense 22,909 22,330 22,149 22,508 16,801 16,157 16,711 31,470 Income before income taxes 12,088 13,874 15,945 15,632 8,334 10,534 9,583 2,408 Income tax expense 3,442 4,258 5,042 4,730 2,723 3,341 3,127 716 Net income $ 8,646 $ 9,616 $ 10,903 $ 10,902 $ 5,611 $ 7,193 $ 6,456 $ 1,692 Per common share (3) : Basic $ 0.56 $ 0.62 $ 0.70 $ 0.70 $ 0.50 $ 0.64 $ 0.58 $ 0.11 Diluted $ 0.56 $ 0.62 $ 0.70 $ 0.70 $ 0.50 $ 0.64 $ 0.57 $ 0.11 (1) In the second quarter of 2016, the Company adopted ASU 2016-09 effective as of January 1, 2016. As such, first quarter 2016 financial results have been restated from previously reported within Form 10-Q. (2) On October 16, 2015, the Company completed its acquisition of SBM. Fourth quarter 2015 results of operations include revenues and expenses incurred as a combined organization from the acquisition date through December 31, 2015. The decrease in basic and diluted EPS in the fourth quarter of 2015 was due to acquisition costs and the issuance of 4.1 million shares of Company common stock (as adjusted for the three-for-two common stock split effective September 30, 2016) in connection with the acquisition. Refer to Note 2 for additional details of the acquisition. (3) Earnings per share amounts have been adjusted to reflect the three-for-two split effective September 30, 2016, for all periods presented. Refer to Note 13.

Business and Summary of Signi53

Business and Summary of Significant Accounting Policies (Details)	3 Months Ended										9 Months Ended	12 Months Ended
	Dec. 31, 2016USD ($)branchofficeatm	Sep. 30, 2016USD ($)	Jun. 30, 2016USD ($)	Mar. 31, 2016USD ($)	[1]	Dec. 31, 2015USD ($)		Sep. 30, 2015USD ($)	Jun. 30, 2015USD ($)	Mar. 31, 2015USD ($)	Sep. 30, 2016	Dec. 31, 2016USD ($)reporting_unit_levelbranchofficeatm$ / shares	Dec. 31, 2015USD ($)	Dec. 31, 2014USD ($)	Dec. 31, 2013USD ($)
Accounting Policy [Line Items]
Cash	$ 50,300,000					$ 42,900,000						$ 50,300,000	$ 42,900,000
Net Income (Loss) Attributable to Parent	10,902,000	$ 10,903,000	$ 9,616,000	$ 8,646,000		1,692,000	[2]	$ 6,456,000	$ 7,193,000	$ 5,611,000		40,067,000	20,952,000	$ 24,570,000
Trading Securities	0					0						0	0
Cash and Cash Equivalents, at Carrying Value	$ 87,707,000					79,488,000						$ 87,707,000	79,488,000	60,813,000	$ 51,355,000
Number of Branches | branch	61											61
Number of ATMs | atm	84											84
Number of commercial production offices | office	2											2
Equity Method Investment, Ownership Percentage	100.00%											100.00%
Loans Held-for-sale	$ 14,836,000					10,958,000						$ 14,836,000	10,958,000
Financing Receivable, Individually Evaluated for Impairment	20,254,000					15,235,000						$ 20,254,000	15,235,000	12,924,000
Number of Reporting Unit Levels | reporting_unit_level												2
Goodwill impairment												$ 0	0	0
BOLI single carrier percentage of Tier I capital												15.00%
BOLI CSV percentage of Tier I Capital												25.00%
Interest-bearing Deposits in Banks and Other Financial Institutions	37,400,000					36,600,000						$ 37,400,000	36,600,000
HTM securities	94,609,000					84,144,000						94,609,000	84,144,000
AFS securities	779,867,000					750,338,000						779,867,000	750,338,000
Available-for-sale Securities, Amortized Cost Basis	789,229,000					756,186,000						$ 789,229,000	756,186,000
Stockholders' Equity Note, Stock Split, Conversion Ratio											1.5	1.5
Minimum [Member]
Accounting Policy [Line Items]
Financing Receivable, Individually Evaluated for Impairment	250,000											$ 250,000
Finite-lived intangible asset, useful life (years)												5 years
Maximum [Member]
Accounting Policy [Line Items]
Finite-lived intangible asset, useful life (years)												10 years
Residential Portfolio Segment [Member]
Accounting Policy [Line Items]
Term to maturity (years)												30 years
Financing Receivable, Individually Evaluated for Impairment	4,348,000					6,026,000						$ 4,348,000	6,026,000	6,411,000
Restatement Adjustment [Member]
Accounting Policy [Line Items]
Net Income (Loss) Attributable to Parent												$ 697,000
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Basic Earnings Per Share | $ / shares												$ 0.05
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Diluted Earnings Per Share | $ / shares												$ 0.04
Retained Earnings [Member]
Accounting Policy [Line Items]
Net Income (Loss) Attributable to Parent												$ 40,067,000	20,952,000	$ 24,570,000
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Net Income												(72,000)
Equity Securities [Member]
Accounting Policy [Line Items]
AFS securities	741,000					705,000						741,000	705,000
Available-for-sale Securities, Amortized Cost Basis	632,000					$ 712,000						632,000	$ 712,000
Substandard | Minimum [Member]
Accounting Policy [Line Items]
Financing Receivable, Individually Evaluated for Impairment	$ 500,000											$ 500,000
[1]	(1)In the second quarter of 2016, the Company adopted ASU 2016-09 effective as of January 1, 2016. As such, first quarter 2016 financial results have been restated from previously reported within Form 10-Q.
[2]	On October 16, 2015, the Company completed its acquisition of SBM. Fourth quarter 2015 results of operations include revenues and expenses incurred as a combined organization from the acquisition date through December 31, 2015. The decrease in basic and diluted EPS in the fourth quarter of 2015 was due to acquisition costs and the issuance of 4.1 million shares of Company common stock (as adjusted for the three-for-two common stock split effective September 30, 2016) in connection with the acquisition. Refer to Note 2 for additional details of the acquisition

Mergers and Acquisitions (Detai

Mergers and Acquisitions (Details)	Oct. 16, 2015USD ($)$ / sharesshares	Dec. 31, 2016USD ($)shares	Dec. 31, 2015USD ($)shares	Dec. 31, 2014USD ($)	Sep. 14, 2016$ / shares	Oct. 15, 2015
Business Acquisition [Line Items]
Equity interest issued		$ 0	$ 110,551,000	$ 0
Share Price | $ / shares					$ 31.75
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Number of Shares | shares		9,450	17,351
Merger and acquisition costs		$ 866,000	$ 10,415,000	0
Goodwill		$ 94,697,000	95,657,000	44,806,000
Number of companies in integration		2
Payments of Stock Issuance Costs		$ 0	612,000	0
SBM Financial, Inc. [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net	$ 86,785,000
Business acquisition, percentage of voting interest acquired	100.00%					80.00%
Business Acquisition, Cash Consideration, Per Share Amount | $ / shares	$ 206
Business Acquisition, Stock for Stock Consideration, Conversion Ratio	8.132
Total consideration paid	$ 136,676,000
Cash	$ 26,125,000
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares | shares	4,124,643
Equity interest issued	$ 108,561,000
Share Price | $ / shares	$ 26.32
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Number of Shares | shares	139,032
Merger and acquisition costs		866,000	$ 10,400,000	$ 0
Non-compete agreement costs		$ 400,000
Goodwill	$ 49,891,000
Loans and loans held for sale	$ 628,030,000
Nonqualified Stock Options [Member] | SBM Financial, Inc. [Member]
Business Acquisition [Line Items]
Business Acquisition, Stock for Stock Consideration, Conversion Ratio	8.132
Equity interest issued	$ 1,990,000
Scenario, Adjustment [Member] | SBM Financial, Inc. [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net	960,000
Loans and loans held for sale	$ 137,000

Mergers and Acquisitions - Esti

Mergers and Acquisitions - Estimated Fair Value of Assets Acquired and Liabilities Assumed (Details) - USD ($) $ / shares in Units, $ in Thousands	Oct. 16, 2015	Dec. 31, 2016	Sep. 14, 2016	Dec. 31, 2015	Dec. 31, 2014
Business Acquisition [Line Items]
Equity interest issued		$ 0		$ 110,551	$ 0
Goodwill		$ 94,697		$ 95,657	$ 44,806
Share Price			$ 31.75
SBM Financial, Inc. [Member]
Business Acquisition [Line Items]
Cash	$ 26,125
Equity interest issued	108,561
Total consideration paid	136,676
Loans and loans held for sale	628,030
Cash and due from banks	86,042
Investments	39,742
Deferred tax assets	25,782
Premises and equipment	23,944
OREO	729
Core deposit intangible assets	6,608
Other assets	5,408
Deposits and borrowings	721,186
Other liabilities	8,314
Total identified assets acquired and liabilities assumed, at fair value	86,785
Goodwill	$ 49,891
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares	4,124,643
Share Price	$ 26.32
Nonqualified Stock Options [Member] | SBM Financial, Inc. [Member]
Business Acquisition [Line Items]
Equity interest issued	$ 1,990
Predecessor [Member] | SBM Financial, Inc. [Member]
Business Acquisition [Line Items]
Loans and loans held for sale	639,390
Cash and due from banks	86,042
Investments	39,716
Deferred tax assets	26,293
Premises and equipment	16,851
OREO	2,530
Core deposit intangible assets	0
Other assets	5,421
Deposits and borrowings	719,640
Other liabilities	8,512
Total identified assets acquired and liabilities assumed, at fair value	88,091
Scenario, Adjustment [Member] | SBM Financial, Inc. [Member]
Business Acquisition [Line Items]
Loans and loans held for sale	137
Cash and due from banks	0
Investments	0
Deferred tax assets	666
Premises and equipment	0
OREO	0
Core deposit intangible assets	0
Other assets	157
Deposits and borrowings	0
Other liabilities	0
Total identified assets acquired and liabilities assumed, at fair value	960
Estimate of Fair Value Measurement [Member] | Scenario, Adjustment [Member] | SBM Financial, Inc. [Member]
Business Acquisition [Line Items]
Loans and loans held for sale	(11,497)
Cash and due from banks	0
Investments	26
Deferred tax assets	(1,177)
Premises and equipment	7,093
OREO	(1,801)
Core deposit intangible assets	6,608
Other assets	(170)
Deposits and borrowings	1,546
Other liabilities	(198)
Total identified assets acquired and liabilities assumed, at fair value	$ (2,266)

Mergers and Acquisitions - Pro

Mergers and Acquisitions - Pro Forma Information (Details)	12 Months Ended
	Dec. 31, 2015
Business Acquisition [Line Items]
Effective income tax rate (percent)	35.00%
SBM Financial, Inc. [Member]
Business Acquisition [Line Items]
Effective income tax rate (percent)	35.00%

Mergers and Acquisitions Acquis

Mergers and Acquisitions Acquisition Costs (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Business Acquisition [Line Items]
Labor and Related Expense	$ 48,072	$ 37,220	$ 32,669
Equipment And Software Expense	9,557	8,057	7,316
Occupancy, Net	7,088	5,695	5,055
Professional Fees	3,234	2,625	2,368
Other Noninterest Expense	10,687	9,210	7,845
Business Combination, Acquisition Related Costs	866	10,415	0
SBM Financial, Inc. [Member]
Business Acquisition [Line Items]
Labor and Related Expense	8	3,240
Equipment And Software Expense	279	1,531
Occupancy, Net	439	1,237
Professional Fees	80	2,453
Other Noninterest Expense	60	1,954
Business Combination, Acquisition Related Costs	$ 866	$ 10,400	0
Business Acquisition One [Member]
Business Acquisition [Line Items]
Labor and Related Expense			0
Equipment And Software Expense			0
Occupancy, Net			0
Professional Fees			0
Other Noninterest Expense			$ 0

Securities (Additional Informat

Securities (Additional Information) (Details)	12 Months Ended
	Dec. 31, 2016USD ($)security	Dec. 31, 2015USD ($)security	Dec. 31, 2014USD ($)
Schedule of Investments [Line Items]
Unrealized gains on securities available-for-sale included in accumulated other comprehensive income, net of deferred taxes	$ (6,085,000)	$ (3,801,000)
Unrealized gains on securities available-for-sale included in accumulated other comprehensive income, deferred taxes	$ 3,227,000	$ 2,047,000
Number of investment securities which had unrealized losses for twelve months or longer | security	209	109
AFS and HTM securities in Continues Unrealized Loss Position	$ 658,500,000	$ 546,000,000
AFS and HTM Securities Unrealized Loss Accumulated in Investments	13,200,000	10,200,000
Investment securities with unrealized losses for twelve months or longer	103,708,000	192,809,000
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	3,850,000	6,709,000
Investment securities with unrealized losses that are considered temporary	615,699,000	540,460,000
Available For Sale Securities Continuous Unrealized Loss Position Aggregate Losses Accumulated In Investments	(12,536,000)	(10,141,000)
Other than temporary impairment losses		0
Federal Home Loan Bank Stock	17,800,000	20,600,000
Federal Reserve Bank Stock	5,400,000	908,000
Carrying value of investments sold	28,800,000	12,400,000	$ 25,200,000
Security pledged as collateral, amortized cost	597,300,000	577,600,000
Security pledged as collateral, fair value	$ 589,700,000	$ 570,900,000
Unrealized Loss as a Percent of Amortized Cost	2.00%	2.00%
Gross realized gains	$ 125,000	$ 221,000	451,000
Mortgage Backed Securities and Collateralized Mortgage Obligations [Member]
Schedule of Investments [Line Items]
Investment securities with unrealized losses for twelve months or longer	103,700,000	192,800,000
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	3,900,000	6,700,000
Available-for-sale Securities [Member]
Schedule of Investments [Line Items]
Unrealized gains on securities available-for-sale included in accumulated other comprehensive income, deferred taxes	3,300,000	2,000,000
Gross realized gains	$ 51,000	$ 4,000	$ 451,000

Securities (Summary of Amortize

Securities (Summary of Amortized Costs and Estimated Fair Values of Available-For-Sale Securities) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Schedule of Investments [Line Items]
Available-for-sale, Amortized Cost	$ 789,229	$ 756,186
Available-for-sale, Unrealized Gains	3,174	4,293
Available-for-sale, Unrealized Losses	(12,536)	(10,141)
AFS securities	779,867	750,338
Held-to-maturity Securities	94,609	84,144
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain	618	1,564
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss	(631)	(61)
Held-to-maturity Securities, Fair Value	94,596	85,647
US Government Corporations and Agencies Securities [Member]
Schedule of Investments [Line Items]
Held-to-maturity Securities	94,609	84,144
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain	618	1,564
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss	(631)	(61)
Held-to-maturity Securities, Fair Value	94,596	85,647
US Government-sponsored Enterprises Debt Securities [Member]
Schedule of Investments [Line Items]
Available-for-sale, Amortized Cost		4,971
Available-for-sale, Unrealized Gains		69
Available-for-sale, Unrealized Losses		0
AFS securities		5,040
Obligations of states and political subdivisions [Member]
Schedule of Investments [Line Items]
Available-for-sale, Amortized Cost	8,848	17,355
Available-for-sale, Unrealized Gains	153	339
Available-for-sale, Unrealized Losses	0	0
AFS securities	9,001	17,694
Mortgage-backed securities issued or guaranteed by U.S. government sponsored enterprises [Member]
Schedule of Investments [Line Items]
Available-for-sale, Amortized Cost	485,222	419,429
Available-for-sale, Unrealized Gains	2,515	3,474
Available-for-sale, Unrealized Losses	(7,115)	(3,857)
AFS securities	480,622	419,046
Collateralized mortgage obligations issued or guaranteed by U.S. government sponsored enterprises [Member]
Schedule of Investments [Line Items]
Available-for-sale, Amortized Cost	289,046	312,719
Available-for-sale, Unrealized Gains	265	409
Available-for-sale, Unrealized Losses	(5,421)	(6,271)
AFS securities	283,890	306,857
Corporate Debt Securities [Member]
Schedule of Investments [Line Items]
Available-for-sale, Amortized Cost	5,481	1,000
Available-for-sale, Unrealized Gains	132
Available-for-sale, Unrealized Losses	0	(4)
AFS securities	5,613	996
Debt Securities [Member]
Schedule of Investments [Line Items]
Available-for-sale, Amortized Cost	788,597	755,474
Available-for-sale, Unrealized Gains	3,065	4,291
Available-for-sale, Unrealized Losses	(12,536)	(10,132)
AFS securities	779,126	749,633
Equity Securities [Member]
Schedule of Investments [Line Items]
Available-for-sale, Amortized Cost	632	712
Available-for-sale, Unrealized Gains	109	2
Available-for-sale, Unrealized Losses	0	(9)
AFS securities	$ 741	$ 705

Securities (Unrealized Gross Lo

Securities (Unrealized Gross Losses and Estimated Fair values of Investment Securities by Length of Time that Individual Securities in Each Category in Continuous Loss Position) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]
Fair Value - Less Than 12 Months	$ 511,991	$ 347,651
Unrealized Losses - Less Than 12 Months	(8,686)	(3,432)
Fair Value - 12 Months or More	103,708	192,809
Unrealized Losses - 12 Months or More	(3,850)	(6,709)
Fair Value	615,699	540,460
Unrealized Losses	(12,536)	(10,141)
Available-for-sale Securities, Amortized Cost Basis	789,229	756,186
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	3,174	4,293
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	42,805	5,507
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(631)	(61)
Held-to-maturity Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	0	0
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0	0
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value	42,805	5,507
Held-to-maturity Securities, Continuous Unrealized Loss Position, Accumulated Loss	(631)	(61)
Obligations of U.S. government sponsored enterprises [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value - Less Than 12 Months	348,579	234,897
Unrealized Losses - Less Than 12 Months	(5,780)	(2,351)
Fair Value - 12 Months or More	29,496	45,629
Unrealized Losses - 12 Months or More	(1,335)	(1,506)
Fair Value	378,075	280,526
Unrealized Losses	(7,115)	(3,857)
Available-for-sale Securities, Amortized Cost Basis		4,971
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax		69
Collateralized mortgage obligations
Schedule of Available-for-sale Securities [Line Items]
Fair Value - Less Than 12 Months	163,412	111,143
Unrealized Losses - Less Than 12 Months	(2,906)	(1,068)
Fair Value - 12 Months or More	74,212	147,180
Unrealized Losses - 12 Months or More	(2,515)	(5,203)
Fair Value	237,624	258,323
Unrealized Losses	(5,421)	(6,271)
Corporate Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value - Less Than 12 Months		996
Unrealized Losses - Less Than 12 Months		(4)
Fair Value - 12 Months or More		0
Unrealized Losses - 12 Months or More		0
Fair Value		996
Unrealized Losses		(4)
Available-for-sale Securities, Amortized Cost Basis	5,481	1,000
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	132
Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value - Less Than 12 Months		615
Unrealized Losses - Less Than 12 Months		(9)
Fair Value - 12 Months or More		0
Unrealized Losses - 12 Months or More		0
Fair Value		615
Unrealized Losses		(9)
Available-for-sale Securities, Amortized Cost Basis	632	712
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	109	2
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	485,222	419,429
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	2,515	3,474
US States and Political Subdivisions Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	8,848	17,355
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	153	339
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	42,805
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(631)
Held-to-maturity Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	0
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value	42,805
Held-to-maturity Securities, Continuous Unrealized Loss Position, Accumulated Loss	$ (631)
US Government Corporations and Agencies Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value		5,507
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss		(61)
Held-to-maturity Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value		0
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss		0
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value		5,507
Held-to-maturity Securities, Continuous Unrealized Loss Position, Accumulated Loss		$ (61)

Securities (Company's Sales of

Securities (Company's Sales of Securities) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]
Unrealized Loss as a Percent of Amortized Cost	2.00%	2.00%
Proceeds from sales of securities	$ 28,850	$ 12,426	$ 25,695
Gross realized gains	125	221	$ 451
Gross realized losses	$ (74)	(217)
Previously recorded OTTI		$ (204)

Securities (Amortized Cost and

Securities (Amortized Cost and Estimated Fair Values of Debt Securities by Contractual Maturity) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Available-for-sale, Amortized Cost
Due in one year or less	$ 1,034
Due after one year through five years	86,362
Due after five years through ten years	129,521
Due after ten years	571,680
Total	788,597
Available-for-sale, Fair Value
Due in one year or less	1,039
Due after one year through five years	86,299
Due after five years through ten years	129,248
Due after ten years	562,540
Total	779,126
Held-to-maturity, Amortized Cost
Due after one year through five years	5,599
Due after five years through ten years	4,210
Due after ten years	84,800
Held-to-maturity Securities	94,609	$ 84,144
Held-to-maturity, Fair Value
Due after one year through five years	5,650
Due after five years through ten years	4,221
Due after ten years	84,725
Held-to-maturity Securities, Fair Value	$ 94,596	$ 85,647

Loans and Allowance for Loan 63

Loans and Allowance for Loan Losses (Additional Information) (Details)	12 Months Ended
	Dec. 31, 2016USD ($)loan	Dec. 31, 2015USD ($)loan	Dec. 31, 2014USD ($)	Dec. 31, 2013USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Individually Evaluated for Impairment	$ 20,254,000	$ 15,235,000	$ 12,924,000
Financing receivable, allowance for credit losses	23,116,000	21,166,000	21,116,000	$ 21,590,000
Foregone interest	$ 888,000	$ 586,000	$ 842,000
Number of Portfolio Concentration Industries	0
Financing Receivable, Modifications, Number of Contracts	6	1	6
Allowance Related to Troubled Debt Restructurings assigned during period	$ 1,400,000	$ 27,000	$ 49,000
Loans and Leases Receivable, Impaired, Commitment to Lend	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0	0	0
HPFC Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Individually Evaluated for Impairment	97,000
Financing receivable, allowance for credit losses	672,000	24,000	0
Unallocated Financing Receivables [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, allowance for credit losses	0	0	2,384,000	2,671,000
Residential real estate loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Individually Evaluated for Impairment	$ 4,348,000	6,026,000	6,411,000
Term to maturity (years)	30 years
Financing receivable, allowance for credit losses	$ 4,160,000	4,545,000	4,899,000	5,603,000
Financing Receivable in Process of Foreclosure	1,400,000	2,900,000
Loans Receivable [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans restructured due to credit difficulties that are now performing	4,300,000	4,800,000
Financing Receivables Impaired Troubled Debt Restructuring Non-Performing	1,400,000	446,000
Consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Individually Evaluated for Impairment	7,000	74,000	157,000
Financing receivable, allowance for credit losses	181,000	$ 193,000	$ 281,000	$ 319,000
Minimum [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Individually Evaluated for Impairment	$ 250,000
Number of Months	18
Minimum [Member] | HPFC Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term to maturity (years)	7 years
Maximum [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Months	24
Maximum [Member] | HPFC Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term to maturity (years)	10 years
Total Loan Portfolio [Member] | Loan Concentration Risk [Member] | Non-Residential Building Operators Industry Sector [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration Risk, Percentage	12.00%
Commercial real estate loans | Loan Concentration Risk [Member] | Non-Residential Building Operators Industry Sector [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration Risk, Percentage	31.00%
HPFC Subsidiary [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of days past due	45
Commercial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans	1
Loans and Leases Receivable, Impaired, Commitment to Lend	$ 280,000
Commercial loans | Extended Maturity [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans restructured due to credit difficulties that are now performing	$ 47,000
Financing Receivable, Modifications, Number of Contracts	6	0	0
Allowance Related to Troubled Debt Restructurings assigned during period	$ 1,400,000	$ 0	$ 0

Loans and Allowance for Loan 64

Loans and Allowance for Loan Losses (Composition of Loan Portfolio, Excluding Residential Loans Held for Sale) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]
Deferred loan fees, net	$ 66	$ (370)
Loans	2,594,564	2,490,206	$ 1,772,610
Residential real estate loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	802,494	820,617
Loans	802,494	820,617	585,468
Commercial real estate loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	1,050,780	927,951
Loans	1,050,780	927,951	640,661
Commercial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	333,639	297,721
Loans	333,639	297,721	257,515
Home equity loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	329,907	348,634
Loans	329,907	348,634	271,709
Consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	17,332	17,953
Loans	17,332	17,953	$ 17,257
HPFC Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	60,412	77,330
Loans	$ 60,412	$ 77,330

Loans and Allowance for Loan 65

Loans and Allowance for Loan Losses (Schedule of Loans Made to Related Parties) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Loans and Leases Receivable, Related Parties [Roll Forward]
Balance at beginning of year	$ 16,628	$ 17,469
Loans made/advanced and additions	434	374
Repayments and reductions	(1,120)	(1,215)
Balance at end of year	$ 15,942	$ 16,628

Loans and Allowance for Loan 66

Loans and Allowance for Loan Losses (Activity in Allowance for Loan Losses by Portfolio Segment) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Financing Receivable, Allowance for Credit Losses [Line Items]
Reserve for unfunded commitments	$ 11,000	$ 22,000	$ 17,000
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance	21,166,000	21,116,000	21,590,000
Loans charged off	(3,805,000)	(2,616,000)	(3,444,000)
Recoveries	486,000	728,000	746,000
Ending balance	23,116,000	21,166,000	21,116,000
Ending Balance: Individually evaluated for impairment	2,007,000	1,369,000	953,000
Ending Balance: Collectively evaluated for impairment	21,109,000	19,797,000	20,163,000
Ending Balance: Individually evaluated for impairment	20,254,000	15,235,000	12,924,000
Ending Balance: Collectively evaluated for impairment	2,574,310,000	2,474,971,000	1,759,686,000
Total loan balances	2,594,564,000	2,490,206,000	1,772,610,000
Provision for Loan and Lease Losses	5,269,000	1,938,000	2,224,000
Residential real estate loans
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance	4,545,000	4,899,000	5,603,000
Loans charged off	(356,000)	(801,000)	(785,000)
Recoveries	95,000	55,000	165,000
Ending balance	4,160,000	4,545,000	4,899,000
Ending Balance: Individually evaluated for impairment	483,000	544,000	787,000
Ending Balance: Collectively evaluated for impairment	3,677,000	4,001,000	4,112,000
Ending Balance: Individually evaluated for impairment	4,348,000	6,026,000	6,411,000
Ending Balance: Collectively evaluated for impairment	798,146,000	814,591,000	579,057,000
Total loan balances	802,494,000	820,617,000	585,468,000
Provision for Loan and Lease Losses	(124,000)	392,000	(84,000)
Commercial real estate loans
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance	10,432,000	7,951,000	7,206,000
Loans charged off	(315,000)	(481,000)	(361,000)
Recoveries	50,000	74,000	136,000
Ending balance	12,154,000	10,432,000	7,951,000
Ending Balance: Individually evaluated for impairment	1,373,000	644,000	78,000
Ending Balance: Collectively evaluated for impairment	10,781,000	9,788,000	7,873,000
Ending Balance: Individually evaluated for impairment	13,317,000	4,610,000	5,379,000
Ending Balance: Collectively evaluated for impairment	1,037,463,000	923,341,000	635,282,000
Total loan balances	1,050,780,000	927,951,000	640,661,000
Provision for Loan and Lease Losses	1,987,000	2,888,000	970,000
Commercial loans
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance	3,241,000	3,354,000	3,388,000
Loans charged off	(2,218,000)	(655,000)	(1,544,000)
Recoveries	332,000	389,000	394,000
Ending balance	3,755,000	3,241,000	3,354,000
Ending Balance: Individually evaluated for impairment		92,000	10,000
Ending Balance: Collectively evaluated for impairment	3,755,000	3,149,000	3,344,000
Ending Balance: Individually evaluated for impairment	2,028,000	3,937,000	646,000
Ending Balance: Collectively evaluated for impairment	331,611,000	293,784,000	256,869,000
Total loan balances	333,639,000	297,721,000	257,515,000
Provision for Loan and Lease Losses	2,400,000	153,000	1,116,000
Home equity loans
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance	2,731,000	2,247,000	2,403,000
Loans charged off	(308,000)	(525,000)	(611,000)
Recoveries	2,000	188,000	19,000
Ending balance	2,194,000	2,731,000	2,247,000
Ending Balance: Individually evaluated for impairment	86,000	89,000
Ending Balance: Collectively evaluated for impairment	2,108,000	2,642,000	2,247,000
Ending Balance: Individually evaluated for impairment	457,000	588,000	331,000
Ending Balance: Collectively evaluated for impairment	329,450,000	348,046,000	271,378,000
Total loan balances	329,907,000	348,634,000	271,709,000
Provision for Loan and Lease Losses	(231,000)	821,000	436,000
Consumer loans
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance	193,000	281,000	319,000
Loans charged off	(101,000)	(154,000)	(143,000)
Recoveries	7,000	22,000	32,000
Ending balance	181,000	193,000	281,000
Ending Balance: Individually evaluated for impairment			78,000
Ending Balance: Collectively evaluated for impairment	181,000	193,000	203,000
Ending Balance: Individually evaluated for impairment	7,000	74,000	157,000
Ending Balance: Collectively evaluated for impairment	17,325,000	17,879,000	17,100,000
Total loan balances	17,332,000	17,953,000	17,257,000
Provision for Loan and Lease Losses	82,000	44,000	73,000
HPFC Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance	24,000	0
Loans charged off	(507,000)
Ending balance	672,000	24,000	0
Ending Balance: Individually evaluated for impairment	65,000
Ending Balance: Collectively evaluated for impairment	607,000	24,000
Ending Balance: Individually evaluated for impairment	97,000
Ending Balance: Collectively evaluated for impairment	60,315,000	77,330,000
Total loan balances	60,412,000	77,330,000
Provision for Loan and Lease Losses	1,155,000	24,000
Unallocated
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance	0	2,384,000	2,671,000
Ending balance	$ 0	0	2,384,000
Ending Balance: Collectively evaluated for impairment			2,384,000
Provision for Loan and Lease Losses		$ (2,384,000)	$ (287,000)

Loans and Allowance for Loan 67

Loans and Allowance for Loan Losses (Credit Risk Exposure Indicators by Portfolio Segment) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Financing Receivable, Recorded Investment [Line Items]
Loans	$ 2,594,564	$ 2,490,206	$ 1,772,610
Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	2,173,031	2,023,263
Performing Financing Receivable
Financing Receivable, Recorded Investment [Line Items]
Loans	345,615	364,536
Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	13,966	34,720
Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans	58,872	65,636
Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	1,456
Nonperforming Financing Receivable
Financing Receivable, Recorded Investment [Line Items]
Loans	1,624	2,051
Residential real estate loans
Financing Receivable, Recorded Investment [Line Items]
Loans	802,494	820,617	585,468
Residential real estate loans | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	789,554	802,873
Residential real estate loans | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	2,387	3,282
Residential real estate loans | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans	10,553	14,462
Commercial real estate loans
Financing Receivable, Recorded Investment [Line Items]
Loans	1,050,780	927,951	640,661
Commercial real estate loans | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	1,003,386	868,664
Commercial real estate loans | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	5,724	20,732
Commercial real estate loans | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans	41,670	38,555
Commercial loans
Financing Receivable, Recorded Investment [Line Items]
Loans	333,639	297,721	257,515
Commercial loans | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	321,148	281,553
Commercial loans | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	5,598	7,527
Commercial loans | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans	5,437	8,641
Commercial loans | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	1,456
Home equity loans
Financing Receivable, Recorded Investment [Line Items]
Loans	329,907	348,634	271,709
Home equity loans | Performing Financing Receivable
Financing Receivable, Recorded Investment [Line Items]
Loans	328,287	346,701
Home equity loans | Nonperforming Financing Receivable
Financing Receivable, Recorded Investment [Line Items]
Loans	1,620	1,933
Consumer loans
Financing Receivable, Recorded Investment [Line Items]
Loans	17,332	17,953	$ 17,257
Consumer loans | Performing Financing Receivable
Financing Receivable, Recorded Investment [Line Items]
Loans	17,328	17,835
Consumer loans | Nonperforming Financing Receivable
Financing Receivable, Recorded Investment [Line Items]
Loans	4	118
HPFC Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	60,412	77,330
HPFC Portfolio Segment [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	77,330
HPFC Portfolio Segment [Member] | Performing Financing Receivable
Financing Receivable, Recorded Investment [Line Items]
Loans	58,943	70,173
HPFC Portfolio Segment [Member] | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans	257	3,179
HPFC Portfolio Segment [Member] | Nonperforming Financing Receivable
Financing Receivable, Recorded Investment [Line Items]
Loans	$ 1,212	$ 3,978

Loans and Allowance for Loan 68

Loans and Allowance for Loan Losses (Loan Aging Analysis by Portfolio Segment (Including Loans Past Due Over Ninety Days and Non Accrual Loans) and Summary of Non Accrual Loans) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	$ 25,465	$ 23,212
Current	2,569,099	2,466,994
Total loan balances	2,594,564	2,490,206	$ 1,772,610
Non-Accrual Loans	20,713	18,322
Residential real estate loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	5,611	9,973
Current	796,883	810,644
Total loan balances	802,494	820,617	585,468
Non-Accrual Loans	3,945	7,253
Commercial real estate loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	13,703	8,230
Current	1,037,077	919,721
Total loan balances	1,050,780	927,951	640,661
Non-Accrual Loans	12,849	4,529
Commercial loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	2,526	1,819
Current	331,113	295,902
Total loan balances	333,639	297,721	257,515
Non-Accrual Loans	2,088	4,489
Home equity loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	2,347	2,788
Current	327,560	345,846
Total loan balances	329,907	348,634	271,709
Non-Accrual Loans	1,620	1,933
Consumer loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	42	237
Current	17,290	17,716
Total loan balances	17,332	17,953	$ 17,257
Non-Accrual Loans	4	118
HPFC Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1,236	165
Current	59,176	77,165
Total loan balances	60,412	77,330
Non-Accrual Loans	207
Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	18,639	10,286
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Residential real estate loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	2,904	6,077
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Commercial real estate loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	12,625	1,584
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Commercial loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1,675	1,002
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Home equity loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1,321	1,505
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Consumer loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	4	118
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | HPFC Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	110
Financing Receivables, 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	2,187	4,195
Financing Receivables, 60 to 89 Days Past Due [Member] | Residential real estate loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	924	571
Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial real estate loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	223	2,427
Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	218	550
Financing Receivables, 60 to 89 Days Past Due [Member] | Home equity loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	134	640
Financing Receivables, 60 to 89 Days Past Due [Member] | Consumer loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		7
Financing Receivables, 60 to 89 Days Past Due [Member] | HPFC Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	688
Financing Receivables, 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	4,639	8,731
Financing Receivables, 30 to 59 Days Past Due [Member] | Residential real estate loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1,783	3,325
Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial real estate loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	855	4,219
Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	633	267
Financing Receivables, 30 to 59 Days Past Due [Member] | Home equity loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	892	643
Financing Receivables, 30 to 59 Days Past Due [Member] | Consumer loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	38	112
Financing Receivables, 30 to 59 Days Past Due [Member] | HPFC Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	$ 438	$ 165

Loans and Allowance for Loan 69

Loans and Allowance for Loan Losses (Summary of All Troubled Debt Restructuring Loans (Accruing and Non Accruing) by Portfolio Segment) (Details)	12 Months Ended
	Dec. 31, 2016USD ($)loan	Dec. 31, 2015USD ($)loan	Dec. 31, 2014USD ($)
Financing Receivable, Modifications [Line Items]
Financing Receivable Modifications Number Of Contracts Outstanding | loan	35	38
Financing Receivable, Modifications, Recorded Investment	$ 5,747,000	$ 5,277,000
Specific Reserve	$ 483,000	$ 603,000
Number of Contracts	6	1	6
Pre-Modification Outstanding Recorded Investment	$ 2,973,000	$ 74,000	$ 488,000
Post-Modification Outstanding Recorded Investment	2,973,000	78,000	491,000
Specific Reserve	1,400,000	27,000	49,000
Recorded investment of troubled-debt restructurings that subsequently defaulted	$ 0	$ 0	$ 0
Commercial loans
Financing Receivable, Modifications [Line Items]
Financing Receivable Modifications Number Of Contracts Outstanding | loan	10	9
Financing Receivable, Modifications, Recorded Investment	$ 1,502,000	$ 399,000
Specific Reserve	$ 0	$ 11,000
Home equity loans
Financing Receivable, Modifications [Line Items]
Financing Receivable Modifications Number Of Contracts Outstanding | loan	1	1
Financing Receivable, Modifications, Recorded Investment	$ 16,000	$ 21,000
Specific Reserve	$ 0	$ 0
Residential Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable Modifications Number Of Contracts Outstanding | loan	21	22
Financing Receivable, Modifications, Recorded Investment	$ 3,221,000	$ 3,398,000
Specific Reserve	$ 483,000	$ 544,000
Commercial Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable Modifications Number Of Contracts Outstanding | loan	3	6
Financing Receivable, Modifications, Recorded Investment	$ 1,008,000	$ 1,459,000
Specific Reserve	$ 0	$ 48,000
Extended Maturity [Member] | Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts	0	0	1
Pre-Modification Outstanding Recorded Investment	$ 0	$ 0	$ 235,000
Post-Modification Outstanding Recorded Investment	0	0	235,000
Specific Reserve	$ 0	$ 0	$ 0
Extended Maturity [Member] | Residential Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts	0	0	1
Pre-Modification Outstanding Recorded Investment	$ 0	$ 0	$ 136,000
Post-Modification Outstanding Recorded Investment	0	0	149,000
Specific Reserve	$ 0	$ 0	$ 43,000
Extended Maturity [Member] | Commercial loans
Financing Receivable, Modifications [Line Items]
Number of Contracts	6	0	0
Pre-Modification Outstanding Recorded Investment	$ 2,973,000	$ 0	$ 0
Post-Modification Outstanding Recorded Investment	2,973,000	0	0
Specific Reserve	$ 1,400,000	$ 0	$ 0
Court Order [Member] | Residential Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts	0	1	0
Pre-Modification Outstanding Recorded Investment	$ 0	$ 74,000	$ 0
Post-Modification Outstanding Recorded Investment	0	78,000	0
Specific Reserve	$ 0	$ 27,000	$ 0
Court Order [Member] | Commercial loans
Financing Receivable, Modifications [Line Items]
Number of Contracts	0	0	3
Pre-Modification Outstanding Recorded Investment	$ 0	$ 0	$ 77,000
Post-Modification Outstanding Recorded Investment	0	0	77,000
Specific Reserve	$ 0	$ 0	$ 6,000
Principal Forgiveness [Member] | Home equity loans
Financing Receivable, Modifications [Line Items]
Number of Contracts	0	0	1
Pre-Modification Outstanding Recorded Investment	$ 0	$ 0	$ 40,000
Post-Modification Outstanding Recorded Investment	0	0	30,000
Specific Reserve	$ 0	$ 0	$ 0

Loans and Allowance for Loan 70

Loans and Allowance for Loan Losses (Summary of Impaired Loan Balances and Associated Allowance by Portfolio Segment) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Financing Receivable, Impaired [Line Items]
Recorded investment with related allowance recorded	$ 14,858	$ 5,475	$ 5,931
Unpaid principal balance with related allowance recorded	14,858	5,507	5,931
Average recorded investment with related allowance recorded	9,418	9,857	18,117
Interest income recognized with related allowance recorded	106	114	133
Recorded investment without related allowance recorded	5,396	9,760	6,993
Unpaid principal balance without related allowance recorded	7,756	12,942	8,330
Impaired Financing Receivable With No Related Allowance Related Allowance	0	0
Average recorded investment without related allowance recorded	6,970	6,695	6,337
Interest income recognized without related allowance recorded	76	90	58
Recorded investment, total impaired loans	20,254	15,235	12,924
Unpaid principal balance, total impaired loans	22,614	18,449	14,261
Related allowance, total impaired loans	2,007	1,369	953
Average recorded investment, total impaired loans	16,388	16,552	24,454
Interest income recognized, total impaired loans	182	204	191
Residential real estate loans
Financing Receivable, Impaired [Line Items]
Recorded investment with related allowance recorded	3,019	3,191	4,468
Unpaid principal balance with related allowance recorded	3,019	3,191	4,468
Average recorded investment with related allowance recorded	3,088	6,064	9,254
Interest income recognized with related allowance recorded	106	112	125
Recorded investment without related allowance recorded	1,329	2,835	1,943
Unpaid principal balance without related allowance recorded	1,800	4,353	2,604
Impaired Financing Receivable With No Related Allowance Related Allowance	0	0
Average recorded investment without related allowance recorded	2,057	2,175	2,257
Interest income recognized without related allowance recorded	9	8	7
Related allowance, total impaired loans	483	544	787
Commercial real estate loans
Financing Receivable, Impaired [Line Items]
Recorded investment with related allowance recorded	11,443	1,825	1,140
Unpaid principal balance with related allowance recorded	11,443	1,857	1,140
Average recorded investment with related allowance recorded	5,165	1,753	4,721
Recorded investment without related allowance recorded	1,874	2,785	4,239
Unpaid principal balance without related allowance recorded	2,369	3,426	4,502
Impaired Financing Receivable With No Related Allowance Related Allowance	0	0
Average recorded investment without related allowance recorded	2,214	2,719	2,869
Interest income recognized without related allowance recorded	51	65	40
Related allowance, total impaired loans	1,373	644	78
Commercial loans
Financing Receivable, Impaired [Line Items]
Recorded investment with related allowance recorded		156	183
Unpaid principal balance with related allowance recorded		156	183
Average recorded investment with related allowance recorded	762	945	2,366
Interest income recognized with related allowance recorded		2	8
Recorded investment without related allowance recorded	2,028	3,781	463
Unpaid principal balance without related allowance recorded	3,209	4,325	606
Impaired Financing Receivable With No Related Allowance Related Allowance	0	0
Average recorded investment without related allowance recorded	2,507	1,412	791
Interest income recognized without related allowance recorded	16	17	11
Related allowance, total impaired loans	0	92	10
Home equity loans
Financing Receivable, Impaired [Line Items]
Recorded investment with related allowance recorded	299	303
Unpaid principal balance with related allowance recorded	299	303
Average recorded investment with related allowance recorded	305	900	1,428
Recorded investment without related allowance recorded	158	285	331
Unpaid principal balance without related allowance recorded	368	688	581
Impaired Financing Receivable With No Related Allowance Related Allowance	0	0
Average recorded investment without related allowance recorded	180	369	399
Related allowance, total impaired loans	86	89
Consumer loans
Financing Receivable, Impaired [Line Items]
Recorded investment with related allowance recorded			140
Unpaid principal balance with related allowance recorded			140
Average recorded investment with related allowance recorded		195	348
Recorded investment without related allowance recorded	7	74	17
Unpaid principal balance without related allowance recorded	10	150	37
Impaired Financing Receivable With No Related Allowance Related Allowance	0	0
Average recorded investment without related allowance recorded	12	20	21
Related allowance, total impaired loans	0	0	$ 78
HPFC Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Recorded investment with related allowance recorded	97
Unpaid principal balance with related allowance recorded	97
Average recorded investment with related allowance recorded	98
Impaired Financing Receivable With No Related Allowance Related Allowance	0	0
Average recorded investment without related allowance recorded
Related allowance, total impaired loans	$ 65	$ 0

Loans and Allowance for Loan 71

Loans and Allowance for Loan Losses (Schedule of Provision for Credit Losses) (Details) - USD ($) $ in Thousands	3 Months Ended										12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	[1]	Dec. 31, 2015	[2]	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
LOANS AND ALLOWANCE FOR LOAN LOSSES [Abstract]
Provision (credit)(1)											$ 5,269	$ 1,938	$ 2,224
Provision for Other Credit Losses											(11)	(2)	(4)
Provision for credit losses	$ 255	$ 1,279	$ 2,852	$ 872		$ 957		$ 279	$ 254	$ 446	$ 5,258	$ 1,936	$ 2,220
[1]	(1)In the second quarter of 2016, the Company adopted ASU 2016-09 effective as of January 1, 2016. As such, first quarter 2016 financial results have been restated from previously reported within Form 10-Q.
[2]	On October 16, 2015, the Company completed its acquisition of SBM. Fourth quarter 2015 results of operations include revenues and expenses incurred as a combined organization from the acquisition date through December 31, 2015. The decrease in basic and diluted EPS in the fourth quarter of 2015 was due to acquisition costs and the issuance of 4.1 million shares of Company common stock (as adjusted for the three-for-two common stock split effective September 30, 2016) in connection with the acquisition. Refer to Note 2 for additional details of the acquisition

Loans and Allowance for Loan 72

Loans and Allowance for Loan Losses (Schedule of FV mark amortization) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]
Net Unamortized fair Value Mark (Discount) on Loans	$ 8,810	$ 13,083
Loans and Leases Receivable, Deferred Income	(66)	370
Unamortized Loan Commitment and Origination Fees and Unamortized Discounts or Premiums	$ 8,744	$ 13,453

Goodwill and Other Intangible73

Goodwill and Other Intangible Assets (Additional Information) (Details) - USD ($)		12 Months Ended
		Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Oct. 16, 2015
Acquired Finite-Lived Intangible Assets [Line Items]
Goodwill		$ 94,697,000	$ 95,657,000	$ 44,806,000
Goodwill, Period Increase (Decrease)	[1]		(960,000)	50,851,000
Goodwill, Impaired, Accumulated Impairment Loss		3,570,000	3,570,000	3,570,000
Goodwill, Impairment Loss, Net of Tax		0
Financial Services
Acquired Finite-Lived Intangible Assets [Line Items]
Goodwill		3,904,000	3,904,000	3,904,000
Goodwill, Period Increase (Decrease)	[1]		0
Goodwill, Impaired, Accumulated Impairment Loss		$ 3,570,000	$ 3,570,000	$ 3,570,000
SBM Financial, Inc. [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Goodwill					$ 49,891,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net					86,785,000
Scenario, Adjustment [Member] | SBM Financial, Inc. [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net					$ 960,000
[1]	On October 16, 2015, the Company completed the Merger and goodwill of $49.9 million after recording a measurement-period adjustment decreasing goodwill of $960,000 in 2016 upon completion of purchase accounting. Refer to Note 2 for additional details and discussion.

Goodwill and Other Intangible74

Goodwill and Other Intangible Assets (Changes in Goodwill) (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2016	Oct. 16, 2015
Goodwill [Line Items]
Goodwill		$ 99,227	$ 48,376	$ 98,267
Accumulated impairment losses		(3,570)	(3,570)	(3,570)
Reported goodwill		95,657	44,806	94,697
Activity for the year	[1]	960	(50,851)
Banking
Goodwill [Line Items]
Goodwill		91,753	40,902	90,793
Accumulated impairment losses		0	0	0
Reported goodwill		91,753	40,902	90,793
Activity for the year	[1]	960	(50,851)
Financial Services
Goodwill [Line Items]
Goodwill		7,474	7,474	7,474
Accumulated impairment losses		(3,570)	(3,570)	(3,570)
Reported goodwill		3,904	$ 3,904	$ 3,904
Activity for the year	[1]	$ 0
SBM Financial, Inc. [Member]
Goodwill [Line Items]
Reported goodwill					$ 49,891
[1]	On October 16, 2015, the Company completed the Merger and goodwill of $49.9 million after recording a measurement-period adjustment decreasing goodwill of $960,000 in 2016 upon completion of purchase accounting. Refer to Note 2 for additional details and discussion.

Other Intangible Assets (Detail

Other Intangible Assets (Details) - USD ($) $ in Thousands	Oct. 16, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Period Increase (Decrease)		$ (1,903)	$ 5,302
Accumulated Amortization
Amortization of intangible assets		1,903	1,306	$ 1,148
Net
Beginning balance		8,667	3,365
Activity during period		(1,903)	(1,306)	(1,148)
Ending balance		6,764	8,667	3,365
Core Deposits [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Period Increase (Decrease)		(1,828)	5,377
Gross
Beginning balance		23,908	17,300
Activity during period		0	6,608
Ending balance		23,908	23,908	17,300
Accumulated Amortization
Beginning balance		(15,392)	(14,161)
Amortization of intangible assets		(1,828)	(1,231)
Ending balance		(17,220)	(15,392)	(14,161)
Net
Beginning balance		8,516	3,139
Activity during period		1,828	1,231
Ending balance		6,688	8,516	3,139
Trust Relationship [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Period Increase (Decrease)		(75)	(75)
Gross
Beginning balance		753	753
Activity during period		0	0
Ending balance		753	753	753
Accumulated Amortization
Beginning balance		(602)	(527)
Amortization of intangible assets		(75)	(75)
Ending balance		(677)	(602)	(527)
Net
Beginning balance		151	226
Activity during period		75	75
Ending balance		$ 76	$ 151	$ 226
SBM Financial, Inc. [Member] | Core Deposits [Member]
Gross
Activity during period	$ 6,600
Net
Finite-Lived Intangible Assets, Remaining Amortization Period	10 years

Other Intangible Assets (Schedu

Other Intangible Assets (Schedule of Expected Future Amortization of Intangible Assets) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items]
2,017	$ 1,811
2,018	725
2,019	705
2,020	682
2,021	655
Thereafter	2,186
Total	6,764	$ 8,667	$ 3,365
Core Deposits [Member]
Finite-Lived Intangible Assets [Line Items]
2,017	1,735
2,018	725
2,019	705
2,020	682
2,021	655
Thereafter	2,186
Total	6,688	8,516	3,139
Trust Relationship [Member]
Finite-Lived Intangible Assets [Line Items]
2,017	76
2,018	0
2,019	0
2,020	0
2,021	0
Thereafter	0
Total	$ 76	$ 151	$ 226

Premises and Equipment (Equipme

Premises and Equipment (Equipment) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 74,013	$ 76,111
Accumulated depreciation and amortization	(31,140)	(30,152)
Premises and equipment, net	42,873	45,959
Gain (Loss) on Disposition of Assets	0	(1,130)	$ 0
Gain (Loss) on Disposition of Property Plant Equipment	0	0	$ 0
Land and land improvements [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	3,012	3,102
Buildings and leasehold improvements [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	36,958	37,926
Furniture, fixtures and equipment [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	34,043	35,083
Software and Software Development Costs [Member]
Property, Plant and Equipment [Line Items]
Accumulated depreciation and amortization	(3,200)	(3,300)
Capitalized Computer Software, Gross	3,600	3,800
Capital Lease Obligations [Member]
Property, Plant and Equipment [Line Items]
Capital Leased Assets, Gross	$ 855	855
SBM Financial, Inc. [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Disposals		$ 1,100

Premises and Equipment (Leases)

Premises and Equipment (Leases) (Details) $ in Thousands		12 Months Ended
		Dec. 31, 2016USD ($)property	Dec. 31, 2015USD ($)	Dec. 31, 2014USD ($)
Property, Plant and Equipment [Line Items]
Lease expense		$ 1,800	$ 1,700	$ 1,200
Number of properties | property		1
Lessee Leasing Arrangements, Operating Leases, Term of Contract		5 years
number of lease extensions		2
Lessee Leasing Arrangements, Operating Leases, Renewal Term		5 years
Capital Lease Obligations		$ 858	922
Operating Leases
2,017		1,427
2,018		1,186
2,019		1,144
2,020		644
2,021		447
Thereafter		1,783
Total		6,631
Capital Leases
2,017		126
2,018		126
2,019		126
2,020		126
2,021		130
Thereafter		555
Total		1,189
Less: amount representing interest	[1]	331
Present value of net minimum lease payments	[2]	$ 858
Capital Lease Obligations [Member]
Property, Plant and Equipment [Line Items]
Year through which capital lease on branch facility will extend		Mar. 31, 2026
Capital lease interest rate		9.75%
Capital lease for a branch facility		$ 855	855
Accumulated depreciation for a branch facility		$ 459	$ 416
Lease Agreements [Member]
Property, Plant and Equipment [Line Items]
Year through which capital lease on branch facility will extend		Dec. 1, 2019
Officer [Member]
Property, Plant and Equipment [Line Items]
number of related parties		2
[1]	Amount necessary to reduce net minimum lease payments to present value calculated at the Company's incremental borrowing rate at lease inception.
[2]	Reflects the liability reported within short- and long-term borrowings on the consolidated statements of condition. At December 31, 2016 and 2015, the capital lease liability was $858,000 and $922,000, respectively.

Premises and Equipment - Deprec

Premises and Equipment - Depreciation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Property, Plant and Equipment [Line Items]
Depreciation, Depletion and Amortization, Nonproduction	$ 4,426	$ 3,614	$ 3,051
Equipment [Member]
Property, Plant and Equipment [Line Items]
Depreciation	1,942	1,620	1,713
Building and Building Improvements [Member]
Property, Plant and Equipment [Line Items]
Depreciation	1,757	1,140	1,003
Software Development [Member]
Property, Plant and Equipment [Line Items]
Depreciation	275	337	335
SBM Financial, Inc. [Member] | Property, Plant and Equipment [Member]
Property, Plant and Equipment [Line Items]
Depreciation	$ 452	$ 517	$ 0

Mortgage Servicing (Additional

Mortgage Servicing (Additional Information) (Details) - USD ($)		12 Months Ended
		Dec. 31, 2016		Dec. 31, 2015		Dec. 31, 2014	Dec. 31, 2013
Servicing Assets at Fair Value [Line Items]
Servicing Asset at Amortized Cost		$ 1,210,000		$ 2,161,000		$ 493,000	$ 726,000
Servicing Asset at Fair Value, Amount	[2]	$ 1,701,000	[1]	$ 2,947,000	[1]	1,447,000	$ 1,494,000
Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Prepayment Speed		14.60%		11.00%
Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Discount Rate		7.80%		7.50%
Sensitivity Analysis of Fair Value, Transferor's Interests in Transferred Financial Assets, Impact of 10 Percent Adverse Change in Prepayment Speed		$ 97,000
Fees and Commissions, Mortgage Banking and Servicing		1,100,000		$ 597,000		484,000
Gain (Loss) on Sale of Mortgage Loans		6,201,000		1,278,000		31,000
Receivables Held-for-sale, Amount		15,100,000		10,800,000
Unrealized Gain (Loss) on Derivatives		(289,000)		133,000
Unrealized gain (loss) on loans held for sale		(422,000)		133,000		0
Mortgage loans serviced during period, value		930,800,000		963,000,000
Advance Payments by Borrowers for Taxes and Insurance		2,000,000		4,900,000
Sensitivity Analysis of Fair Value, Transferor's Interests in Transferred Financial Assets, Impact of 20 Percent Adverse Change in Prepayment Speed		185,000
Sensitivity Analysis of Fair Value, Transferor's Interests in Transferred Financial Assets, Impact of 10 Percent Adverse Change in Discount Rate		57,000
Sensitivity Analysis of Fair Value, Transferor's Interests in Transferred Financial Assets, Impact of 20 Percent Adverse Change in Discount Rate		111,000
Capitalized servicing right fees upon sale(1)	[3]	9,000		294,000		15,000
Maine State Housing Authority [Member]
Servicing Assets at Fair Value [Line Items]
Fees and Commissions, Mortgage Banking and Servicing		1,700,000		1,200,000		1,200,000
Mortgage loans serviced during period, value		619,100,000		612,100,000
Custodial escrow balances		6,300,000		4,300,000
Fixed Rate Residential Mortgage [Member]
Servicing Assets at Fair Value [Line Items]
Mortgage Loans on Real Estate, Cost of Mortgages Sold		232,200,000		61,200,000		799,000
Custodial escrow balances		11,900,000		7,100,000
Accounts Receivable, Net		2,700,000		5,700,000
Allowance for Doubtful Accounts Receivable		$ 829,000		489,000
US Treasury Notes Securities [Member]
Servicing Assets at Fair Value [Line Items]
Term to maturity (years)		10 years
SBM Financial, Inc. [Member]
Servicing Assets at Fair Value [Line Items]
Capitalized servicing right fees upon sale(1)		$ 0		$ 1,608,000		$ 0
[1]	Reported fair value represents all MSRs currently being serviced by the Company at December 31, 2015.
[2]	Reported fair value represents all MSRs currently being serviced by the Company.
[3]	Reported within mortgage banking income, net on the Company's consolidated statements of income.

Mortgage Servicing (Schedule of

Mortgage Servicing (Schedule of Mortgage Servicing) (Details) - USD ($)		12 Months Ended
		Dec. 31, 2016		Dec. 31, 2015		Dec. 31, 2014
Servicing Asset at Amortized Cost, Balance [Roll Forward]
Balance at beginning of year		$ 2,161,000		$ 493,000		$ 726,000
Capitalized servicing right fees upon sale(1)	[1]	9,000		294,000		15,000
Amortization charged against mortgage servicing fee income(1)	[1]	(734,000)		(231,000)		(262,000)
Valuation adjustment		(226,000)		3,000		(14,000)
Balance at end of year		1,210,000		2,161,000		493,000
Valuation Allowance:
Balance at beginning of year		(4,000)		(1,000)		(15,000)
(Increase) decrease in impairment reserve(1)	[1]	(226,000)		(3,000)
Reduction of impairment reserve	[1]					(14,000)
Balance at end of year		(230,000)		(4,000)		(1,000)
Fair value, beginning of year	[3]	2,947,000	[2]	1,447,000		1,494,000
Fair value, end of year	[3]	1,701,000	[2]	2,947,000	[2]	1,447,000
SBM Financial, Inc. [Member]
Servicing Asset at Amortized Cost, Balance [Roll Forward]
Capitalized servicing right fees upon sale(1)		$ 0		$ 1,608,000		$ 0
[1]	Reported within mortgage banking income, net on the Company's consolidated statements of income.
[2]	Reported fair value represents all MSRs currently being serviced by the Company at December 31, 2015.
[3]	Reported fair value represents all MSRs currently being serviced by the Company.

Deposits (Details)

Deposits (Details) - USD ($)	Dec. 31, 2016	Dec. 31, 2015
Deposit [Line Items]
2,017	$ 265,792,000
2,018	89,497,000
2,019	54,453,000
2,020	54,776,000
2,021	32,260,000
Thereafter	13,364,000
Total certificates of deposit	510,142,000
FDIC Insurance Limit	250,000
Time Deposits, $250,000 or more	104,500,000	$ 136,600,000
Deposits from certain officers, directors, and their associated companies	14,400,000	15,700,000
Deposit Liabilities Reclassified as Loans Receivable	986,000	$ 663,000
Retail [Member]
Deposit [Line Items]
2,017	230,853,000
2,018	89,497,000
2,019	54,453,000
2,020	47,776,000
2,021	32,260,000
Thereafter	13,364,000
Total certificates of deposit	468,203,000
Brokered [Member]
Deposit [Line Items]
2,017	34,939,000
2,020	7,000,000
Total certificates of deposit	$ 41,939,000

Borrowings (Additional Informat

Borrowings (Additional Information) (Details)		12 Months Ended
		Dec. 31, 2016USD ($)	Dec. 31, 2015USD ($)
Short-term Debt [Line Items]
number of contracts		1
Securities Sold under Agreements to Repurchase	[1]	$ 230,612,000	$ 215,041,000
Amortization of Debt Issuance Costs		54,000	9,000
Line of credit, maximum borrowing capacity		10,000,000
Line of credit, amount outstanding		$ 0
Line of credit, expiration date		Dec. 20, 2017
Loans Pledged as Collateral		$ 115,000,000
Available-for-sale Securities Pledged as Collateral		$ 73,000
Debt Instrument, Interest Rate During Period		4.67%
Federal Home Loan Bank Advances [Member]
Short-term Debt [Line Items]
Line of credit, maximum borrowing capacity		$ 9,900,000	9,900,000
Line of credit, amount outstanding		0	0
PNC [Member]
Short-term Debt [Line Items]
Line of credit, maximum borrowing capacity		50,000,000
Federal Reserve Bank Advances [Member]
Short-term Debt [Line Items]
Line of credit, maximum borrowing capacity		72,300,000
Commercial Borrower [Member]
Short-term Debt [Line Items]
Securities Sold under Agreements to Repurchase		$ 5,007,000	$ 30,052,000
[1]	(1) Total repurchase agreements are presented within short-term borrowings on the consolidated statements of condition.

Borrowings (Schedule of Other B

Borrowings (Schedule of Other Borrowed Funds) (Details) - USD ($) $ in Thousands		Dec. 31, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Securities Sold under Agreements to Repurchase	[1]	$ 230,612	$ 215,041
Total short-term borrowings		530,129	477,852
Total long-term borrowings		10,791	35,911
Short-term Debt [Member]
Debt Instrument [Line Items]
Securities Sold under Agreements to Repurchase		225,605	184,989
FHLBB borrowings		210,000	255,000
FHLBB and correspondent bank overnight borrowings		89,450	12,800
Capital lease obligation		67	63
Long-term Debt [Member]
Debt Instrument [Line Items]
Securities Sold under Agreements to Repurchase		0	5,052
Long-term Federal Home Loan Bank Advances		10,000	30,000
Capital lease obligation		791	859
Commercial and Industrial Sector [Member] | Short-term Debt [Member]
Debt Instrument [Line Items]
Securities Sold under Agreements to Repurchase		$ 5,007	$ 25,000
[1]	(1) Total repurchase agreements are presented within short-term borrowings on the consolidated statements of condition.

Borrowings (Schedule of Amounts

Borrowings (Schedule of Amounts Outstanding and Interest Rates of Short-term Borrowings) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Debt Disclosure [Abstract]
Balance outstanding at end of year	$ 530,129	$ 477,852
Weighted average interest rate	0.74%	0.57%

Borrowings (Schedule of Advance

Borrowings (Schedule of Advances to the Federal Home Loan Bank) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Fixed Rate:
FHLB advances, carrying value of residential real estate and commercial loans pledged as collateral	$ 1,060,000
FHLB advances, securities pledged as collateral	$ 400	$ 544
Minimum [Member]
Fixed Rate:
2,017	0.73%
2,020	1.87%
Maximum [Member]
Fixed Rate:
2,017	0.84%
Long-term Debt [Member]
Fixed Rate:
Capital Lease Obligations, Noncurrent	$ 791	859
Long-term Federal Home Loan Bank Advances	10,000	30,000
Short-term Debt [Member]
Total Outstanding:
2,017	210,000	$ 255,000
Short Term Borrowing Maturing January 2017 [Member] | Short-term Debt [Member]
Total Outstanding:
2,017	$ 190,000
Federal Home Loan Bank, Advances, Callable Option [Member] | Minimum [Member]
Fixed Rate:
2,017	3.99%
Federal Home Loan Bank, Advances, Callable Option [Member] | Maximum [Member]
Fixed Rate:
2,017	4.06%
Federal Home Loan Bank, Advances, Callable Option [Member] | Short-term Debt [Member]
Total Outstanding:
2,017	$ 20,000

Borrowings (Junior Subordinated

Borrowings (Junior Subordinated Debentures) (Details) - USD ($)	Oct. 08, 2015	Apr. 30, 2006	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2006	Dec. 31, 2008
Debt Instrument [Line Items]
Subordinated Debt	$ 15,000,000		$ 58,755,000	$ 58,599,000
Subordinated Borrowing, Interest Rate	5.50%
Debt Instrument, Term	10 years		10 years
Debt Issuance Cost			$ 54,000	9,000
Payments of Debt Issuance Costs			$ 536,000
Debt Instrument, Frequency of Periodic Payment			semi-annually
Debt Instrument, Maturity Date			Oct. 15, 2020
Debt Instrument, Call Date, Earliest			Oct. 15, 2025
Value of trust preferred securities included in Tier I Capital			$ 43,000,000	43,000,000			$ 43,000,000
Interest Expense, Junior Subordinated Debentures			3,415,000	2,724,000	$ 2,532,000
Junior Subordinated Debt [Member]
Debt Instrument [Line Items]
Value of trust preferred securities included in Tier I Capital			$ 43,000,000
Percentage of trust preferred securities included in Tier I Capital ratio			13.00%
Junior Subordinated Debt [Member] | Subsidiary One [Member]
Debt Instrument [Line Items]
Proceeds from issuance of trust preferred securities		$ 36,100,000
Value of outstanding common shares of subsidiary owned by company		$ 1,100,000
Debt instrument, interest rate		6.71%
Debt instrument, interest rate terms		now floats at the 3 month LIBOR plus 140 basis points
Debt interest rate, additional rate over three month LIBOR		1.40%
Junior Subordinated Debt [Member] | Union Bankshares Capital Trust I [Member]
Debt Instrument [Line Items]
Value of outstanding common shares of subsidiary owned by company						$ 248,000
Debt instrument, interest rate terms						The interest rate of the trust preferred securities until April 7, 2011 was a blended rate equal to the sum of (1) the product of 50% times the average three-month LIBOR plus 1.42%, plus (2) the product of 50% times 6.4725%. The rate is now the average three-month LIBOR plus 1.42%.
Debt interest rate, additional rate over three month LIBOR						1.42%
Trust preferred securities assumed in acquisition							$ 8,000,000
Aggregate amount of junior subordinated debt issued to subsidiary by acquired company, prior to acquisition						$ 8,200,000
Debt Instrument, Term						30 years
Debt instrument fixed rate						6.4725%
interest rate multiplier applied to variable rate						50.00%
interest rate multiplier applied to fixed rate						50.00%
Interest rate swaps
Debt Instrument [Line Items]
Notional amount of derivative			$ 43,000,000	$ 43,000,000

Repurchase Agreements (Details)

Repurchase Agreements (Details) - USD ($) $ in Thousands		Dec. 31, 2016	Dec. 31, 2015
Assets Sold under Agreements to Repurchase [Line Items]
Certificates of Deposit, at Carrying Value		$ 917	$ 914
Securities Sold under Agreements to Repurchase	[1]	230,612	215,041
Overnight and Continuous
Assets Sold under Agreements to Repurchase [Line Items]
Securities Sold under Agreements to Repurchase	[1]	225,605	184,989
Up to 30 Days
Assets Sold under Agreements to Repurchase [Line Items]
Securities Sold under Agreements to Repurchase	[1]	0	0
30 - 90 Days
Assets Sold under Agreements to Repurchase [Line Items]
Securities Sold under Agreements to Repurchase	[1]	5,007	0
Greater than 90 Days
Assets Sold under Agreements to Repurchase [Line Items]
Securities Sold under Agreements to Repurchase	[1]	0	30,052
Commercial Borrower
Assets Sold under Agreements to Repurchase [Line Items]
Securities Sold under Agreements to Repurchase		5,007	30,052
Commercial Borrower | Overnight and Continuous
Assets Sold under Agreements to Repurchase [Line Items]
Securities Sold under Agreements to Repurchase		0	0
Commercial Borrower | Up to 30 Days
Assets Sold under Agreements to Repurchase [Line Items]
Securities Sold under Agreements to Repurchase		0	0
Commercial Borrower | 30 - 90 Days
Assets Sold under Agreements to Repurchase [Line Items]
Securities Sold under Agreements to Repurchase		5,007	0
Commercial Borrower | Greater than 90 Days
Assets Sold under Agreements to Repurchase [Line Items]
Securities Sold under Agreements to Repurchase		0	30,052
Commercial Borrower | Mortgage-backed securities issued or guaranteed by U.S. government sponsored enterprises [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Securities Sold under Agreements to Repurchase		3,715	22,016
Commercial Borrower | Mortgage-backed securities issued or guaranteed by U.S. government sponsored enterprises [Member] | Overnight and Continuous
Assets Sold under Agreements to Repurchase [Line Items]
Securities Sold under Agreements to Repurchase		0	0
Commercial Borrower | Mortgage-backed securities issued or guaranteed by U.S. government sponsored enterprises [Member] | Up to 30 Days
Assets Sold under Agreements to Repurchase [Line Items]
Securities Sold under Agreements to Repurchase		0	0
Commercial Borrower | Mortgage-backed securities issued or guaranteed by U.S. government sponsored enterprises [Member] | 30 - 90 Days
Assets Sold under Agreements to Repurchase [Line Items]
Securities Sold under Agreements to Repurchase		3,715	0
Commercial Borrower | Mortgage-backed securities issued or guaranteed by U.S. government sponsored enterprises [Member] | Greater than 90 Days
Assets Sold under Agreements to Repurchase [Line Items]
Securities Sold under Agreements to Repurchase		0	22,016
Commercial Borrower | Collateralized mortgage obligations issued or guaranteed by U.S. government sponsored enterprises [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Securities Sold under Agreements to Repurchase		1,292	8,036
Commercial Borrower | Collateralized mortgage obligations issued or guaranteed by U.S. government sponsored enterprises [Member] | Overnight and Continuous
Assets Sold under Agreements to Repurchase [Line Items]
Securities Sold under Agreements to Repurchase		0	0
Commercial Borrower | Collateralized mortgage obligations issued or guaranteed by U.S. government sponsored enterprises [Member] | Up to 30 Days
Assets Sold under Agreements to Repurchase [Line Items]
Securities Sold under Agreements to Repurchase		0	0
Commercial Borrower | Collateralized mortgage obligations issued or guaranteed by U.S. government sponsored enterprises [Member] | 30 - 90 Days
Assets Sold under Agreements to Repurchase [Line Items]
Securities Sold under Agreements to Repurchase		1,292	0
Commercial Borrower | Collateralized mortgage obligations issued or guaranteed by U.S. government sponsored enterprises [Member] | Greater than 90 Days
Assets Sold under Agreements to Repurchase [Line Items]
Securities Sold under Agreements to Repurchase		0	8,036
Retail [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Securities Sold under Agreements to Repurchase		225,605	184,989
Retail [Member] | Overnight and Continuous
Assets Sold under Agreements to Repurchase [Line Items]
Securities Sold under Agreements to Repurchase		225,605	184,989
Retail [Member] | Up to 30 Days
Assets Sold under Agreements to Repurchase [Line Items]
Securities Sold under Agreements to Repurchase		0	0
Retail [Member] | 30 - 90 Days
Assets Sold under Agreements to Repurchase [Line Items]
Securities Sold under Agreements to Repurchase		0	0
Retail [Member] | Greater than 90 Days
Assets Sold under Agreements to Repurchase [Line Items]
Securities Sold under Agreements to Repurchase		0	0
Retail [Member] | Obligations of states and political subdivisions [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Securities Sold under Agreements to Repurchase			556
Retail [Member] | Obligations of states and political subdivisions [Member] | Overnight and Continuous
Assets Sold under Agreements to Repurchase [Line Items]
Securities Sold under Agreements to Repurchase			556
Retail [Member] | Obligations of states and political subdivisions [Member] | Up to 30 Days
Assets Sold under Agreements to Repurchase [Line Items]
Securities Sold under Agreements to Repurchase			0
Retail [Member] | Obligations of states and political subdivisions [Member] | 30 - 90 Days
Assets Sold under Agreements to Repurchase [Line Items]
Securities Sold under Agreements to Repurchase			0
Retail [Member] | Obligations of states and political subdivisions [Member] | Greater than 90 Days
Assets Sold under Agreements to Repurchase [Line Items]
Securities Sold under Agreements to Repurchase			0
Retail [Member] | Mortgage-backed securities issued or guaranteed by U.S. government sponsored enterprises [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Securities Sold under Agreements to Repurchase		117,784	95,967
Retail [Member] | Mortgage-backed securities issued or guaranteed by U.S. government sponsored enterprises [Member] | Overnight and Continuous
Assets Sold under Agreements to Repurchase [Line Items]
Securities Sold under Agreements to Repurchase		117,784	95,967
Retail [Member] | Mortgage-backed securities issued or guaranteed by U.S. government sponsored enterprises [Member] | Up to 30 Days
Assets Sold under Agreements to Repurchase [Line Items]
Securities Sold under Agreements to Repurchase		0	0
Retail [Member] | Mortgage-backed securities issued or guaranteed by U.S. government sponsored enterprises [Member] | 30 - 90 Days
Assets Sold under Agreements to Repurchase [Line Items]
Securities Sold under Agreements to Repurchase		0	0
Retail [Member] | Mortgage-backed securities issued or guaranteed by U.S. government sponsored enterprises [Member] | Greater than 90 Days
Assets Sold under Agreements to Repurchase [Line Items]
Securities Sold under Agreements to Repurchase		0	0
Retail [Member] | Collateralized mortgage obligations issued or guaranteed by U.S. government sponsored enterprises [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Securities Sold under Agreements to Repurchase		107,821	88,466
Retail [Member] | Collateralized mortgage obligations issued or guaranteed by U.S. government sponsored enterprises [Member] | Overnight and Continuous
Assets Sold under Agreements to Repurchase [Line Items]
Securities Sold under Agreements to Repurchase		107,821	88,466
Retail [Member] | Collateralized mortgage obligations issued or guaranteed by U.S. government sponsored enterprises [Member] | Up to 30 Days
Assets Sold under Agreements to Repurchase [Line Items]
Securities Sold under Agreements to Repurchase		0	0
Retail [Member] | Collateralized mortgage obligations issued or guaranteed by U.S. government sponsored enterprises [Member] | 30 - 90 Days
Assets Sold under Agreements to Repurchase [Line Items]
Securities Sold under Agreements to Repurchase		0	0
Retail [Member] | Collateralized mortgage obligations issued or guaranteed by U.S. government sponsored enterprises [Member] | Greater than 90 Days
Assets Sold under Agreements to Repurchase [Line Items]
Securities Sold under Agreements to Repurchase		$ 0	$ 0
[1]	(1) Total repurchase agreements are presented within short-term borrowings on the consolidated statements of condition.

Income Taxes (Schedule of Incom

Income Taxes (Schedule of Income Tax Expense) (Details) - USD ($)	3 Months Ended										12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	[1]	Dec. 31, 2015		Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Oct. 16, 2015
Income Tax Contingency [Line Items]
Effective Income Tax Rate Reconciliation, Percent												35.00%
Operating Loss Carryforwards						$ 803,000						$ 803,000		$ 3,900,000
Current:
Federal											$ 17,854,000	7,956,000	$ 11,435,000
State											930,000	71,000	505,000
Total											18,784,000	8,027,000	11,940,000
Deferred:
Federal											(1,258,000)	1,356,000	(500,000)
Deferred State and Local Income Tax Expense (Benefit)											(54,000)	524,000	0
Deferred Income Tax Expense (Benefit)											(1,312,000)	1,880,000	(500,000)
Income tax expense	$ 4,730,000	$ 5,042,000	$ 4,258,000	$ 3,442,000		$ 716,000	[2]	$ 3,127,000	$ 3,341,000	$ 2,723,000	$ 17,472,000	$ 9,907,000	$ 11,440,000
Minimum [Member]
Income Tax Contingency [Line Items]
Operating Loss Carryforwards, Expiration Date											Dec. 31, 2030
Open Tax Year											2,013
Income Tax Examination, Year under Examination											2,013
Maximum [Member]
Income Tax Contingency [Line Items]
Operating Loss Carryforwards, Expiration Date											Dec. 31, 2034
Open Tax Year											2,015
Income Tax Examination, Year under Examination											2,014
Federal Tax
Income Tax Contingency [Line Items]
Operating Loss Carryforwards														6,800,000
SBM Financial, Inc. [Member]
Income Tax Contingency [Line Items]
Effective Income Tax Rate Reconciliation, Percent												35.00%
SBM Financial, Inc. [Member] | Federal Tax
Income Tax Contingency [Line Items]
Operating Loss Carryforwards														71,200,000
Operating Loss Carryforwards, Valuation Allowance														0
SBM Financial, Inc. [Member] | State and Local Jurisdiction [Member]
Income Tax Contingency [Line Items]
Operating Loss Carryforwards														$ 213,000
[1]	(1)In the second quarter of 2016, the Company adopted ASU 2016-09 effective as of January 1, 2016. As such, first quarter 2016 financial results have been restated from previously reported within Form 10-Q.
[2]	On October 16, 2015, the Company completed its acquisition of SBM. Fourth quarter 2015 results of operations include revenues and expenses incurred as a combined organization from the acquisition date through December 31, 2015. The decrease in basic and diluted EPS in the fourth quarter of 2015 was due to acquisition costs and the issuance of 4.1 million shares of Company common stock (as adjusted for the three-for-two common stock split effective September 30, 2016) in connection with the acquisition. Refer to Note 2 for additional details of the acquisition

Income Taxes (Reconciliation of

Income Taxes (Reconciliation of Expected Income Tax Benefit Computed Using Federal Statutory Income Tax Rate) (Details) - USD ($) $ in Thousands		3 Months Ended										12 Months Ended
		Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	[2]	Dec. 31, 2015	[3]	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Computed tax expense												$ 20,139	$ 10,801	$ 12,604
Tax exempt income												(1,312)	(1,092)	(704)
Income from life insurance												(908)	(588)	(503)
Effective income tax reconciliation, share based awards	[1]											(701)	0	0
State taxes, net of federal benefit												565	373	328
Low income housing credits												(376)	(359)	(286)
Effective interest rate reconciliation non-deductible acquisition costs												0	467	0
Other												65	305	1
Income tax expense		$ 4,730	$ 5,042	$ 4,258	$ 3,442		$ 716		$ 3,127	$ 3,341	$ 2,723	17,472	9,907	11,440
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest		$ 15,632	$ 15,945	$ 13,874	$ 12,088		$ 2,408		$ 9,583	$ 10,534	$ 8,334	$ 57,539	$ 30,859	$ 36,010
Income tax rate used for calculations												30.40%	32.10%	31.80%
[1]	(1) Prior to the adoption of ASU 2016-09, the Company accounted for its windfall tax benefits or shortfalls generated upon exercise of a non-qualified stock option or a disqualifying incentive stock option, or upon vesting of its restricted shares through shareholders' equity (or as income tax expense to the extent the Company did not have a windfall tax benefit surplus). Upon adoption, the Company has accounted for its windfall tax benefits and shortfalls generated within income tax expense on the consolidated statements of income as a discrete period item in the quarter generated.
[2]	(1)In the second quarter of 2016, the Company adopted ASU 2016-09 effective as of January 1, 2016. As such, first quarter 2016 financial results have been restated from previously reported within Form 10-Q.
[3]	On October 16, 2015, the Company completed its acquisition of SBM. Fourth quarter 2015 results of operations include revenues and expenses incurred as a combined organization from the acquisition date through December 31, 2015. The decrease in basic and diluted EPS in the fourth quarter of 2015 was due to acquisition costs and the issuance of 4.1 million shares of Company common stock (as adjusted for the three-for-two common stock split effective September 30, 2016) in connection with the acquisition. Refer to Note 2 for additional details of the acquisition

Income Taxes (Schedule of Defer

Income Taxes (Schedule of Deferred Tax Assets and Deferred Tax Liabilities) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Asset
Net operating loss and tax credit carryforward	$ 20,977	$ 22,282
Allowance for loan losses	8,094	7,416
Pension and other benefits	5,141	4,488
Net unrealized losses on AFS securities	3,227	2,047
Net unrealized losses on derivative instruments	3,066	3,432
Purchase accounting and deposit premium	1,430	2,856
Deferred compensation and benefits	1,791	2,129
Net unrealized losses on postretirement plans	1,147	1,102
Other	956	77
Total	45,829	45,829
Liability
Depreciation	(4,520)	(4,298)
Deferred loan origination fees	(2,046)	(1,815)
Total	(6,566)	(6,113)
Income Tax Contingency [Line Items]
Deferred Tax Assets, Net of Valuation Allowance	$ 39,263	$ 39,716
Minimum [Member]
Income Tax Contingency [Line Items]
Open tax years	2,013
Maximum [Member]
Income Tax Contingency [Line Items]
Open tax years	2,015

Shareholders' Equity (Details)

Shareholders' Equity (Details)	Sep. 14, 2016USD ($)$ / shares	Sep. 30, 2016	Dec. 31, 2016USD ($)$ / sharesshares	Dec. 31, 2015USD ($)shares	Oct. 16, 2015$ / shares	Dec. 31, 2014USD ($)	Sep. 24, 2013shares
Equity, Class of Treasury Stock [Line Items]
number of years			2
Dividends declared to shareholders			$ 12,900,000	$ 10,600,000		$ 8,300,000
Stockholders' Equity Note, Stock Split Ratio, Numerator | shares			1
Stockholders' Equity Note, Stock Split Ratio, Denominator | shares			2
Share Price | $ / shares	$ 31.75
Stockholders' Equity Note, Stock Split, Reduction of Capital	$ 5,000		$ (5,000)
Stockholders' Equity Note, Stock Split, Conversion Ratio		1.5	1.5
2012 Common Stock Repurchase Program [Member]
Equity, Class of Treasury Stock [Line Items]
Stock repurchase program, shares of common stock approved for repurchase | shares							375,000
Stock repurchased during period, shares | shares			0	374,250
Shares repurchased, average cost per share | $ / shares			$ 26.55
The percentage of the stock repurchase program's allotment repurchased during the period			99.80%
Share Repurchase Program, Shares Repurchased as Percentage of Shares Outstanding			2.40%
Subsidiaries [Member]
Equity, Class of Treasury Stock [Line Items]
Dividends declared to shareholders			$ 16,000,000	$ 39,200,000		12,800,000
Acadia Trust [Member]
Equity, Class of Treasury Stock [Line Items]
Dividends declared to shareholders			$ 0	0		$ 0
SBM Financial, Inc. [Member]
Equity, Class of Treasury Stock [Line Items]
Share Price | $ / shares					$ 26.32
SBM Financial, Inc. [Member] | Subsidiaries [Member]
Equity, Class of Treasury Stock [Line Items]
Dividends declared to shareholders				$ 30,000,000

Earnings per Share (Computation

Earnings per Share (Computation of Basic and Diluted Earnings Per Share) (Details) $ / shares in Units, $ in Thousands		3 Months Ended																9 Months Ended	12 Months Ended
		Dec. 31, 2016USD ($)$ / shares		Sep. 30, 2016USD ($)$ / shares		Jun. 30, 2016USD ($)$ / shares		Mar. 31, 2016USD ($)$ / shares	[1]	Dec. 31, 2015USD ($)$ / shares	[2]	Sep. 30, 2015USD ($)$ / shares		Jun. 30, 2015USD ($)$ / shares		Mar. 31, 2015USD ($)$ / shares		Sep. 30, 2016	Dec. 31, 2016USD ($)$ / sharesshares		Dec. 31, 2015USD ($)$ / sharesshares		Dec. 31, 2014USD ($)$ / sharesshares
Earnings Per Share, Basic and Diluted, Other Disclosures [Abstract]
Net income | $		$ 10,902		$ 10,903		$ 9,616		$ 8,646		$ 1,692		$ 6,456		$ 7,193		$ 5,611			$ 40,067		$ 20,952		$ 24,570
Dividends and undistributed earnings allocated to participating securities | $	[3]																		(189)		(59)		(75)
Net income available to common shareholders | $																			$ 39,878		$ 20,893		$ 24,495
Weighted-average common shares outstanding for basic EPS(2)	[4]																		15,422,160		12,031,294		11,176,468
Dilutive effect of stock-based awards	[4],[5]																		82,079		43,285		29,420
Weighted-average common and potential common shares for diluted EPS(2)	[4]																		15,504,239		12,074,579		11,205,888
Basic EPS | $ / shares		$ 0.70	[1],[2],[6]	$ 0.70	[1],[2],[6]	$ 0.62	[1],[2],[6]	$ 0.56	[2],[6]	$ 0.11	[1],[6]	$ 0.58	[1],[2],[6]	$ 0.64	[1],[2],[6]	$ 0.50	[1],[2],[6]		$ 2.59	[4]	$ 1.73	[4]	$ 2.19	[4]
Diluted EPS | $ / shares		$ 0.70	[1],[2],[6]	$ 0.70	[1],[2],[6]	$ 0.62	[1],[2],[6]	$ 0.56	[2],[6]	$ 0.11	[1],[6]	$ 0.57	[1],[2],[6]	$ 0.64	[1],[2],[6]	$ 0.50	[1],[2],[6]		$ 2.57	[4]	$ 1.73	[4]	$ 2.19	[4]
Shares that were not considered in computation of potential common shares for purposes of diluted EPS	[4],[7]																		0		19,875		20,625
Stockholders' Equity Note, Stock Split, Conversion Ratio																		1.5	1.5
[1]	(1)In the second quarter of 2016, the Company adopted ASU 2016-09 effective as of January 1, 2016. As such, first quarter 2016 financial results have been restated from previously reported within Form 10-Q.
[2]	On October 16, 2015, the Company completed its acquisition of SBM. Fourth quarter 2015 results of operations include revenues and expenses incurred as a combined organization from the acquisition date through December 31, 2015. The decrease in basic and diluted EPS in the fourth quarter of 2015 was due to acquisition costs and the issuance of 4.1 million shares of Company common stock (as adjusted for the three-for-two common stock split effective September 30, 2016) in connection with the acquisition. Refer to Note 2 for additional details of the acquisition
[3]	Represents dividends paid and undistributed earnings allocated to nonvested stock-based awards that contain non-forfeitable rights to dividends.
[4]	(2)Share and per share amounts have been adjusted to reflect the three-for-two split effective September 30, 2016, for all periods presented. Refer to Note 13.
[5]	Represents the effect of the assumed exercise of stock options, vesting of restricted shares, vesting of restricted stock units, and vesting of LTIP awards that have met the performance criteria, utilizing the treasury stock method.
[6]	(3)Earnings per share amounts have been adjusted to reflect the three-for-two split effective September 30, 2016, for all periods presented. Refer to Note 13.
[7]	Represents stock-based awards not included in the computation of potential common shares for purposes of calculating diluted EPS as the exercise prices were greater than the average market price of the Company's common stock, and, therefore, are considered anti-dilutive.

Employee Benefit Plans (Additio

Employee Benefit Plans (Additional Information) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
401(k)/Profit Sharing Plan
Contribution match, as a percentage of annual pay	4.00%
Contribution matches, percentage of pre-tax compensation	3.00%	3.00%	3.00%
Expenses under the 401(K)/Profit Sharing plan	$ 2,200,000	$ 1,500,000	$ 1,400,000
Supplemental Executive Retirement Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Minimum guaranteed benefit term	15 years
Accumulated benefit obligation	$ 8,500,000	8,500,000
Expected amortization of net actuarial loss	$ 247,000
Supplemental Executive Retirement Plan [Member] | Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Percentage of income replaced	65.00%
Supplemental Executive Retirement Plan [Member] | Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Percentage of income replaced	75.00%
Other Postretirement Benefit Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Expected amortization of net actuarial loss	$ 41,000
Expected amortization of prior service cost	$ 24,000
Defined Benefit Plan, Effect of Plan Amendment on Accumulated Benefit Obligation		$ 308,000

Stock-Based Compensation Plan95

Stock-Based Compensation Plans (Additional Information) (Details) - USD ($)		May 01, 2012	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number	[1]		58,743	219,399
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period	[1]		157,956
Proceeds from Stock Options Exercised			$ 1,300,000	$ 736,000
Percentage of total compensation			4.00%
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number	[1]		49,293
Stock Option and Incentive Plan 2003 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum number of shares of stock reserved and available for issuance		1,200,000
Stock Option and Incentive Plan 2012 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock based compensation, vesting period			5 years
Stock based compensation, option granted, contractual life			10 years
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation			$ 30,000	51,000	$ 81,000
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense			36,000	59,000	19,000
Unrecognized compensation cost for nonvested stock options			$ 48,000
Unrecognized compensation cost, recognition period			3 years 1 month 6 days
Total intrinsic value of options exercised			$ 2,500,000	573,000	134,000
Restricted Stock Awards and Management Stock Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation			805,000	393,000	321,000
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense			$ 282,000	137,000	112,000
Unrecognized compensation cost, recognition period			2 years 7 months 6 days
Unrecognized compensation cost related to nonvested shares			$ 1,100,000
Management Stock Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise price as a percentage of fair market value on the date of grant			0.00%
Stock based compensation, vesting period			2 years
Share-based compensation			$ 102,000	66,000	67,000
Granted			16,000
Long-Term Performance Share Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation	[2]		$ 1,080,000	330,000	151,000
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense			$ 378,000	116,000	53,000
Unrecognized compensation cost, recognition period			1 year 5 months
Unrecognized compensation cost related to nonvested shares			$ 417,000
Granted			17,385
long term performance plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation	[2]		$ 84,000
Deferred Stock Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation			$ 81,000	$ 62,000	$ 46,000
Unrecognized compensation cost, recognition period			10 years 4 months 18 days
Unrecognized compensation cost related to nonvested shares			$ 308,000
Percentage of total compensation			10.00%
Percentage vested on 65th birthday			100.00%
Granted			4,094	3,609	3,030
Qualified Stock Options [Member] | Stock Option and Incentive Plan 2012 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise price as a percentage of fair market value on the date of grant		100.00%
Nonqualified Stock Options [Member] | Stock Option and Incentive Plan 2012 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise price as a percentage of fair market value on the date of grant		85.00%
SBM Financial, Inc. [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number	[1]			118,299
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period	[1]		109,356
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number	[1]		8,943
SBM Financial, Inc. [Member] | Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense				$ 378,000
Common Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Net Income			$ 72,000
[1]	(1) Options outstanding at January 1, 2016 included 118,299 of non-qualified stock options issued in conjunction with the Merger. Of these, 109,356 were exercised during 2016. At December 31, 2016, 8,943 non-qualified stock options issued in conjunction with the Merger were outstanding and exercisable.
[2]	(1)For the year ended December 31, 2016, $84,000 of compensation expense associated with the LTIP for the plan year January 1, 2016 to December 31, 2018 was accounted for within total compensation expense for restricted stock and restricted stock units above as this plan contains both performance- and service-based conditions.

Employee Benefit Plans (Schedul

Employee Benefit Plans (Schedule of Changes in Benefit Obligation and Plan Assets) (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Amounts recognized in accumulated other comprehensive loss
Total		$ 2,130	$ 2,047
Supplemental Executive Retirement Plan [Member]
Benefit obligations:
Beginning of year		11,052	10,834
Service cost		308	307	$ 270
Interest cost		432	424	456
Actuarial (gain) loss		219	(32)
Benefits paid		(488)	(481)
End of year		11,523	11,052	10,834
Fair value of plan assets:
Beginning of year		0	0
Employer contributions		488	481
Benefits paid		(488)	(481)
End of year		0	0	0
Funded status at end of year(2)	[1]	11,523	11,052
Amounts recognized in accumulated other comprehensive loss
Net actuarial loss		1,791	1,789
Prior service cost (credit)			5
Total		1,791	1,794
Defined Benefit Plan, Business Combinations and Acquisitions, Benefit Obligation	[2]	0	0
Other Postretirement Benefit Plan [Member]
Benefit obligations:
Beginning of year		3,447	2,997
Service cost		59	62	45
Interest cost		151	117	132
Actuarial (gain) loss		143	92
Benefits paid		(165)	(133)
End of year		3,635	3,447	2,997
Fair value of plan assets:
Beginning of year		0	0
Employer contributions		165	133
Benefits paid		(165)	(133)
End of year		0	0	$ 0
Funded status at end of year(2)	[1]	3,635	3,447
Amounts recognized in accumulated other comprehensive loss
Net actuarial loss		495	423
Prior service cost (credit)		(156)	(170)
Total		339	253
Defined Benefit Plan, Business Combinations and Acquisitions, Benefit Obligation	[2]	$ 0	$ 312
[1]	(2)Reported within other liabilities on the consolidated statements of condition.
[2]	(1)In connection with the Merger, the Company assumed its post-retirement benefits for certain former employees and their spouses whereby the Company will cover 100% of healthcare premiums.

Stock-Based Compensation Plan97

Stock-Based Compensation Plans (Schedule of Assumptions Used) (Details) - $ / shares	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Weighted-average dividend yield	3.12%	3.01%	2.90%
Weighted-average risk-free interest rate	1.52%	1.50%	1.65%
Weighted-average expected volatility	29.64%	31.85%	35.39%
Weighted-average expected life (in years)	5 years 3 months 18 days	5 years 3 months 18 days	5 years 3 months 18 days
Weighted-average fair value of options granted	$ 5.17	$ 5.87	$ 5.95

Employee Benefit Plans (Sched98

Employee Benefit Plans (Schedule of Net Period Benefit Cost and Other Amounts Recognized in Other Comprehensive Income) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Supplemental Executive Retirement Plan [Member]
Net period benefit cost
Service cost	$ 308	$ 307	$ 270
Interest cost	432	424	456
Recognized net actuarial loss	220	218	140
Amortization of prior service cost (credit)	7	19	19
Net period benefit cost	967	968	885
Changes in funded status recognized in other comprehensive loss, before taxes
Net actuarial (gain) loss	219	(32)	777
Amortization of net unrecognized actuarial loss	(220)	(218)	(140)
Amortization of prior service (cost) credit	(7)	(19)	(19)
Total recognized in OCI, before taxes	(8)	(269)	618
Total recognized in net period benefit cost and OCI, before taxes	959	699	1,503
Other Postretirement Benefit Plan [Member]
Net period benefit cost
Service cost	59	62	45
Interest cost	151	117	132
Recognized net actuarial loss	30	24	10
Amortization of prior service cost (credit)	(22)	(22)	(22)
Net period benefit cost	218	181	165
Changes in funded status recognized in other comprehensive loss, before taxes
Net actuarial (gain) loss	143	92	(134)
Amortization of net unrecognized actuarial loss	(30)	(24)	(10)
Amortization of prior service (cost) credit	22	22	22
Total recognized in OCI, before taxes	135	90	(122)
Total recognized in net period benefit cost and OCI, before taxes	$ 353	$ 271	$ 43

Stock-Based Compensation Plan99

Stock-Based Compensation Plans (Schedule of Stock Option Activity) (Details) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2016USD ($)$ / sharesshares
Number of Shares
Options outstanding, beginning	219,399	[1]
Granted	3,000	[1]
Exercised	(157,956)	[1]
Forfeited and expired	(5,700)	[1]
Options outstanding, ending	58,743	[1]
Options exercisable	49,293	[1]
Weighted Average Exercise Price Per Share
Options outstanding, beginning | $ / shares	$ 16.93
Granted | $ / shares	25.64
Exercised | $ / shares	15.53
Forfeited and expired | $ / shares	22.93
Options outstanding, ending | $ / shares	20.38
Options exercisable | $ / shares	$ 19.62
Weighted- Average Remaining Contractual Term
Options outstanding	3 years 9 months 26 days
Options exercisable	3 years 10 months 28 days
Aggregate Intrinsic Value
Options outstanding | $	$ 1,558
Options exercisable | $	$ 1,224
SBM Financial, Inc. [Member]
Number of Shares
Options outstanding, beginning	118,299	[1]
Exercised	(109,356)	[1]
Options exercisable	8,943	[1]
[1]	(1) Options outstanding at January 1, 2016 included 118,299 of non-qualified stock options issued in conjunction with the Merger. Of these, 109,356 were exercised during 2016. At December 31, 2016, 8,943 non-qualified stock options issued in conjunction with the Merger were outstanding and exercisable.

Employee Benefit Plans (Sche100

Employee Benefit Plans (Schedule of Assumptions Used to Determine Benefit Obligations and Net Periodic Benefit Cost) (Details)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Supplemental Executive Retirement Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate for benefit obligation	4.00%	4.00%	4.00%
Discount rate for net period benefit cost	4.00%	4.00%	4.75%
Rate of compensation increase for benefit obligation	4.00%	4.00%	4.00%
Rate of compensation increase for net periodic benefit cost	4.00%	4.00%	4.50%
Other Postretirement Benefit Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate for benefit obligation	4.00%	4.50%	4.00%
Discount rate for net period benefit cost	4.50%	4.00%	5.02%
Health care cost trend rate assumed for future years	7.00%	7.00%	7.00%

Stock-Based Compensation Pla101

Stock-Based Compensation Plans (Summary of Nonvested Stock Options) (Details) - $ / shares	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Awards
Nonvested, beginning	17,351
Granted	3,000
Vested	(7,751)
Forfeited	(3,150)
Nonvested, ending	9,450	17,351
Weighted- Average Grant Date Fair Value
Nonvested, beginning	$ 7.40
Granted	5.17	$ 5.87	$ 5.95
Vested	8.13
Forfeited	5.92
Nonvested, ending	$ 6.59	$ 7.40

Employee Benefit Plans (Sche102

Employee Benefit Plans (Schedule of Estimated Future Benefit Payments) (Details) $ in Thousands	Dec. 31, 2016USD ($)
Supplemental Executive Retirement Plan [Member]
Expected future benefit payments under the plans:
2,017	$ 475
2,018	473
2,019	477
2,020	486
2,021	542
2022- 2026	3,127
Other Postretirement Benefit Plan [Member]
Expected future benefit payments under the plans:
2,017	156
2,018	163
2,019	166
2,020	169
2,021	182
2022- 2026	$ 1,043

Stock-Based Compensation Pla103

Stock-Based Compensation Plans (Schedule of Compensation Expense Recognized in Connection with Restricted Stock Awards and MSPP) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Restricted Stock Awards and Management Stock Purchase Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Compensation expense(1)	$ 805	$ 393	$ 321
Related income tax benefit	282	137	112
Fair value of grants vested	660	433	332
Restricted Stock [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Compensation expense(1)	703	327	254
Management Stock Purchase Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Compensation expense(1)	$ 102	$ 66	$ 67

Stock-Based Compensation Pla104

Stock-Based Compensation Plans (Summary of Activity Related to Restricted Stock Awards and Stock Purchase Grants) (Details)	12 Months Ended
	Dec. 31, 2016$ / sharesshares
Restricted Stock [Member]
Number of Shares
Nonvested, beginning | shares	38,391
Granted | shares	32,016
Vested | shares	(22,000)
Forfeited | shares	(894)
Nonvested, ending | shares	47,513
Weighted Average Grant Date Fair Value
Nonvested, beginning | $ / shares	$ 27.09
Granted | $ / shares	28.88
Vested | $ / shares	27.40
Forfeited | $ / shares	26.55
Nonvested, ending | $ / shares	$ 28.16
Management Stock Purchase Plan [Member]
Number of Shares
Nonvested, beginning | shares	18,800
Granted | shares	16,000
Vested | shares	(6,988)
Forfeited | shares	(1,113)
Nonvested, ending | shares	26,699
Weighted Average Grant Date Fair Value
Nonvested, beginning | $ / shares	$ 7.85
Granted | $ / shares	8.02
Vested | $ / shares	8.21
Forfeited | $ / shares	8.10
Nonvested, ending | $ / shares	$ 7.85

Stock-Based Compensation Pla105

Stock-Based Compensation Plans (Schedule of Compensation Expense Recognized in Connection with LTIP) (Details) - Long-Term Performance Share Plan [Member] - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense(1)	[1]	$ 1,080	$ 330	$ 151
Related income tax benefit		378	116	53
Fair value of grants vested		$ 725	$ 412	$ 0
[1]	(1)For the year ended December 31, 2016, $84,000 of compensation expense associated with the LTIP for the plan year January 1, 2016 to December 31, 2018 was accounted for within total compensation expense for restricted stock and restricted stock units above as this plan contains both performance- and service-based conditions.

Stock-Based Compensation Pla106

Stock-Based Compensation Plans (Summary of Activity Related to LTIP) (Details) - $ / shares	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term	5 years 3 months 18 days	5 years 3 months 18 days	5 years 3 months 18 days
Long-Term Performance Share Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term	3 years
Number of Shares
Nonvested, beginning	64,165
Granted	17,385
Vested	(26,396)
Forfeited	(2,417)
Nonvested, ending	52,737	64,165
Weighted Average Grant Date Fair Value
Nonvested, beginning	$ 26.71
Granted	28.87
Vested	27.45
Forfeited	27.45
Nonvested, ending	$ 27.01	$ 26.71

Other Non-Interest Expenses (De

Other Non-Interest Expenses (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Other non-interest income [Line Items]
Other Income		$ 4,830	$ 2,363	$ 2,600
Other income		6,934	3,877	3,080
Postage, freight, and courier		1,754	1,430	1,236
Employee-related costs(1)		1,660	1,841	1,587
Travel and Entertainment Expense	[1]	1,616	1,437	1,287
Labor and Related Expense		48,072	37,220	32,669
Other expenses		5,657	4,502	3,735
Total		10,687	9,210	7,845
Customer loan swaps
Other non-interest income [Line Items]
Interest and Other Income		$ 2,104	$ 1,514	$ 480
[1]	Employee-related costs include hiring, training, education, meeting and business travel costs.

Other Non-Interest Income and E

Other Non-Interest Income and Expenses other non-interest income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Other non-interest income [Line Items]
Other Income	$ 4,830	$ 2,363	$ 2,600
Noninterest Income, Other Operating Income	6,934	3,877	3,080
Customer loan swaps
Other non-interest income [Line Items]
Interest and Other Income	$ 2,104	$ 1,514	$ 480

Commitments And Contingencie109

Commitments And Contingencies (Additional Information) (Details)		12 Months Ended
		Dec. 31, 2016USD ($)swap	Dec. 31, 2015USD ($)	Dec. 31, 2014USD ($)
Legal Proceedings [Line Items]
Loss Contingency Accrual		$ 0	$ 0
Net change in unrealized gains (losses) on cash flow hedging derivatives, net of tax of $343, $825, and $2,431, respectively		(637,000)	(1,533,000)	$ (4,515,000)
Loss on Cash Flow Hedge Ineffectiveness		$ 0	0	0
Derivative, Number of Interest Rate Swap Agreements | swap		2
Unrealized Gain (Loss) on Derivatives		$ (289,000)	133,000
Interest Rate Swap [Member]
Legal Proceedings [Line Items]
Notional amount of derivative		43,000,000	43,000,000
Cash held as collateral		9,700,000
Net Payment on Derivatives		1,500,000	1,700,000
Derivative, Fair Value, Net	[1]	(8,372,000)	(9,229,000)
Forward Commitments To Sell Residential Mortgage Loans [Member]
Legal Proceedings [Line Items]
Notional amount of derivative			0
Forward-Starting Interest Rate Swap [Member]
Legal Proceedings [Line Items]
Notional amount of derivative		50,000,000	50,000,000
Cash held as collateral		474,000
Net Payment on Derivatives		490,000
Derivative, Fair Value, Net	[2]	(389,000)	(576,000)
Interest Rate Lock Commitments [Member]
Legal Proceedings [Line Items]
Notional amount of derivative		15,249,000	20,735,000
Derivative, Fair Value, Net		187,000	139,000
Unrealized Gain (Loss) on Derivatives		48,000	139,000	0
Forward Contracts [Member]
Legal Proceedings [Line Items]
Notional amount of derivative		15,125,000	0
Derivative, Fair Value, Net		278,000	0
Unrealized Gain (Loss) on Derivatives		278,000	0	$ 0
Loans [Member] | Interest Rate Swap [Member]
Legal Proceedings [Line Items]
Notional amount of derivative		532,526,000	285,888,000
Cash held as collateral		0
Derivative, Fair Value, Net		$ 0	$ 0
[1]	Presented within accrued interest and other liabilities on the consolidated statements of condition.
[2]	(1) Presented within accrued interest and other liabilities on the consolidated statements of condition.

Commitments and Contingencie110

Commitments and Contingencies (Summary of Contractual and Notional Amounts of Financial Instruments) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Home Equity Line of Credit [Member]
Financial Instruments [Line Items]
Contractual amounts of financial instrument	$ 454,225	$ 464,701
Commercial And Commercial Real Estate [Member]
Financial Instruments [Line Items]
Contractual amounts of financial instrument	83,103	94,791
Mortgage Loan Commitments [Member]
Financial Instruments [Line Items]
Contractual amounts of financial instrument	17,795	16,256
Letter of Credit [Member]
Financial Instruments [Line Items]
Contractual amounts of financial instrument	2,580	4,468
Other Commitments [Member]
Financial Instruments [Line Items]
Contractual amounts of financial instrument	432	433
Customer loan swaps
Financial Instruments [Line Items]
Notional amount of derivative	532,526	285,888
Forward-Starting Interest Rate Swap [Member]
Financial Instruments [Line Items]
Notional amount of derivative	50,000	50,000
Interest rate swaps
Financial Instruments [Line Items]
Notional amount of derivative	43,000	43,000
Interest Rate Lock Commitments [Member]
Financial Instruments [Line Items]
Notional amount of derivative	15,249	20,735
Forward Contracts [Member]
Financial Instruments [Line Items]
Notional amount of derivative	$ 15,125	$ 0

Commitments and Contingencie111

Commitments and Contingencies (Swapped Variable Cost for Fixed Cost and Terms of Interest Rate Swap Agreements) (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2016	Dec. 31, 2015
Forward-Starting Interest Rate Swap [Member]
Derivative [Line Items]
Notional Amount		$ 50,000	$ 50,000
Derivative, Fair Value, Net	[1]	(389)	(576)
Forward-Starting Interest Rate Swap [Member] | Contract, One
Derivative [Line Items]
Notional Amount		$ 25,000
Trade Date		Feb. 25, 2015
Maturity Date		Feb. 25, 2018
Fixed Rate Paid		1.54%
Derivative, Fair Value, Net	[1]	$ (152)	(230)
Forward-Starting Interest Rate Swap [Member] | Contract, Two
Derivative [Line Items]
Notional Amount		$ 25,000
Trade Date		Feb. 25, 2015
Maturity Date		Feb. 25, 2019
Fixed Rate Paid		1.74%
Derivative, Fair Value, Net	[1]	$ (237)	(346)
Interest rate swaps
Derivative [Line Items]
Notional Amount		43,000	43,000
Derivative, Fair Value, Net	[2]	(8,372)	(9,229)
Interest rate swaps | Contract, One
Derivative [Line Items]
Notional Amount		$ 10,000
Trade Date		Mar. 18, 2009
Maturity Date		Jun. 30, 2021
Fixed Rate Paid		5.09%
Derivative, Fair Value, Net	[2]	$ (806)	(1,038)
Interest rate swaps | Contract, Two
Derivative [Line Items]
Notional Amount		$ 10,000
Trade Date		Jul. 8, 2009
Maturity Date		Jun. 30, 2029
Fixed Rate Paid		5.84%
Derivative, Fair Value, Net	[2]	$ (2,321)	(2,537)
Interest rate swaps | Contract, Three
Derivative [Line Items]
Notional Amount		$ 10,000
Trade Date		May 6, 2010
Maturity Date		Jun. 30, 2030
Fixed Rate Paid		5.71%
Derivative, Fair Value, Net	[2]	$ (2,290)	(2,477)
Interest rate swaps | Contract, Four
Derivative [Line Items]
Notional Amount		$ 5,000
Trade Date		Mar. 14, 2011
Maturity Date		Mar. 30, 2031
Fixed Rate Paid		4.35%
Derivative, Fair Value, Net	[2]	$ (1,211)	(1,301)
Interest rate swaps | Contract, Five
Derivative [Line Items]
Notional Amount		$ 8,000
Trade Date		May 4, 2011
Maturity Date		Jul. 7, 2031
Fixed Rate Paid		4.14%
Derivative, Fair Value, Net	[2]	$ (1,744)	$ (1,876)
[1]	(1) Presented within accrued interest and other liabilities on the consolidated statements of condition.
[2]	Presented within accrued interest and other liabilities on the consolidated statements of condition.

Commitments and Contingencie112

Commitments and Contingencies (Derivatives Effect on Earnings) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments, Gain (Loss) Reclassification from Accumulated OCI to Income, Estimated Net Amount to be Transferred	$ 1,600
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	2,026	$ 1,695	$ 1,714
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net	$ (637)	$ (1,533)	$ (4,515)

Commitments and Contingencie113

Commitments and Contingencies (Commercial Loan Swaps) (Detail) - USD ($) $ in Thousands		Dec. 31, 2016	Dec. 31, 2015
Interest Rate Swap [Member]
Derivative [Line Items]
Notional Amount		$ 43,000	$ 43,000
Derivative, Fair Value, Net	[1]	(8,372)	(9,229)
ERROR in label resolution.
Derivative [Line Items]
Notional Amount		50,000	50,000
Derivative, Fair Value, Net	[2]	$ (389)	$ (576)
federal home loan bank 30-day [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Derivative, Number of Instruments Held		50	28
Notional Amount		$ 266,263	$ 142,944
Derivative, Fair Value, Net		$ (1,945)	$ 3,166
Commercial and Industrial Sector [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Derivative, Number of Instruments Held		50	28
Notional Amount		$ 266,263	$ 142,944
Derivative, Fair Value, Net		$ 1,945	$ (3,166)
Loans [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Derivative, Number of Instruments Held		100	56
Notional Amount		$ 532,526	$ 285,888
Derivative, Fair Value, Net		$ 0	$ 0
[1]	Presented within accrued interest and other liabilities on the consolidated statements of condition.
[2]	(1) Presented within accrued interest and other liabilities on the consolidated statements of condition.

Commitments and Contingencie114

Commitments and Contingencies (Interest rate locks) (Details) - Interest Rate Lock Commitments [Member] - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Other Commitments [Line Items]
Notional Amount	$ 15,249	$ 20,735
Derivative, Fair Value, Net	187	139
Derivative Liability, Fair Value, Gross Liability	(15)	(90)
Derivative Asset, Fair Value, Gross Asset	202	229
Other Liabilities [Member]
Other Commitments [Line Items]
Notional Amount	2,939	8,066
Other Assets [Member]
Other Commitments [Line Items]
Notional Amount	$ 12,310	$ 12,669

Commitments and Contingencie115

Commitments and Contingencies (Forward Contracts) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Interest Rate Lock Commitments [Member]
Other Commitments [Line Items]
Notional Amount	$ 15,249	$ 20,735
Derivative Asset, Fair Value, Gross Asset	202	229
Derivative Liability, Fair Value, Gross Liability	(15)	(90)
Derivative, Fair Value, Net	187	139
Interest Rate Lock Commitments [Member] | Other Assets [Member]
Other Commitments [Line Items]
Notional Amount	12,310	12,669
Interest Rate Lock Commitments [Member] | Other Liabilities [Member]
Other Commitments [Line Items]
Notional Amount	2,939	8,066
Forward Contracts [Member]
Other Commitments [Line Items]
Notional Amount	15,125	0
Derivative Asset, Fair Value, Gross Asset	587	0
Derivative Liability, Fair Value, Gross Liability	(309)	0
Derivative, Fair Value, Net	278	0
Forward Contracts [Member] | Other Assets [Member]
Other Commitments [Line Items]
Notional Amount	14,250	0
Forward Contracts [Member] | Other Liabilities [Member]
Other Commitments [Line Items]
Notional Amount	$ 875	$ 0

Fair Value (Summary of Financia

Fair Value (Summary of Financial Assets and Liabilities Measured at Fair Value on Recurring Basis) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans Held-for-sale, Fair Value Disclosure	$ 14,836,000	$ 10,958,000
Loans Held-for-sale	14,836,000	10,958,000
Unrealized gain (loss) on loans held for sale	(422,000)	133,000	$ 0
Financial Assets:
AFS securities	779,867,000	750,338,000
Obligations of U.S. government sponsored enterprises [Member]
Financial Assets:
AFS securities		5,040,000
Obligations of states and political subdivisions [Member]
Financial Assets:
AFS securities	9,001,000	17,694,000
Mortgage-backed securities issued or guaranteed by U.S. government sponsored enterprises [Member]
Financial Assets:
AFS securities	480,622,000	419,046,000
Collateralized mortgage obligations issued or guaranteed by U.S. government sponsored enterprises [Member]
Financial Assets:
AFS securities	283,890,000	306,857,000
Equity Securities [Member]
Financial Assets:
AFS securities	741,000	705,000
Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans Held-for-sale	14,836,000	10,958,000
Financial Liabilities:
Junior subordinated debt interest rate swaps	8,372,000	9,229,000
Fair Value, Measurements, Recurring [Member] | Obligations of states and political subdivisions [Member]
Financial Assets:
AFS securities	9,001,000	5,040,000
Fair Value, Measurements, Recurring [Member] | Mortgage-backed securities issued or guaranteed by U.S. government sponsored enterprises [Member]
Financial Assets:
AFS securities	480,622,000	17,694,000
Fair Value, Measurements, Recurring [Member] | Collateralized mortgage obligations issued or guaranteed by U.S. government sponsored enterprises [Member]
Financial Assets:
AFS securities	283,890,000	419,046,000
Fair Value, Measurements, Recurring [Member] | Corporate Bond Securities [Member]
Financial Assets:
AFS securities	5,613,000	306,857,000
Fair Value, Measurements, Recurring [Member] | Equity Securities [Member]
Financial Assets:
AFS securities	741,000	996,000
Readily Available Market Prices (Level 1) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans Held-for-sale, Fair Value Disclosure	0	0
Financial Assets:
AFS securities	0	0
Readily Available Market Prices (Level 1) [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans Held-for-sale	0	0
Readily Available Market Prices (Level 1) [Member] | Fair Value, Measurements, Recurring [Member] | Corporate Bond Securities [Member]
Financial Assets:
AFS securities	0	0
Readily Available Market Prices (Level 1) [Member] | Fair Value, Measurements, Recurring [Member] | Equity Securities [Member]
Financial Assets:
AFS securities	0	0
Observable Market Data (Level 2) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans Held-for-sale, Fair Value Disclosure	14,836,000	10,958,000
Financial Assets:
AFS securities	779,867,000	750,338,000
Observable Market Data (Level 2) [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans Held-for-sale	14,836,000	10,958,000
Financial Liabilities:
Junior subordinated debt interest rate swaps	8,372,000	9,229,000
Observable Market Data (Level 2) [Member] | Fair Value, Measurements, Recurring [Member] | Obligations of states and political subdivisions [Member]
Financial Assets:
AFS securities	9,001,000	5,040,000
Observable Market Data (Level 2) [Member] | Fair Value, Measurements, Recurring [Member] | Mortgage-backed securities issued or guaranteed by U.S. government sponsored enterprises [Member]
Financial Assets:
AFS securities	480,622,000	17,694,000
Observable Market Data (Level 2) [Member] | Fair Value, Measurements, Recurring [Member] | Collateralized mortgage obligations issued or guaranteed by U.S. government sponsored enterprises [Member]
Financial Assets:
AFS securities	283,890,000	419,046,000
Observable Market Data (Level 2) [Member] | Fair Value, Measurements, Recurring [Member] | Corporate Bond Securities [Member]
Financial Assets:
AFS securities	5,613,000	306,857,000
Observable Market Data (Level 2) [Member] | Fair Value, Measurements, Recurring [Member] | Equity Securities [Member]
Financial Assets:
AFS securities	741,000	996,000
Company Determined Fair Value (Level 3) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans Held-for-sale, Fair Value Disclosure	0	0
Financial Assets:
AFS securities	0	0
Company Determined Fair Value (Level 3) [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans Held-for-sale	0	0
Company Determined Fair Value (Level 3) [Member] | Fair Value, Measurements, Recurring [Member] | Corporate Bond Securities [Member]
Financial Assets:
AFS securities	0	0
Company Determined Fair Value (Level 3) [Member] | Fair Value, Measurements, Recurring [Member] | Equity Securities [Member]
Financial Assets:
AFS securities	0	0
Interest Rate Swap [Member]
Financial Assets:
Customer interest rate swaps	1,945,000	3,166,000
Financial Liabilities:
Junior subordinated debt interest rate swaps	8,372,000	9,229,000
Customer interest rate swaps	1,945,000	3,166,000
Interest Rate Swap [Member] | Fair Value, Measurements, Recurring [Member]
Financial Assets:
Customer interest rate swaps	1,945,000
Financial Liabilities:
Customer interest rate swaps	1,945,000	3,166,000
Interest Rate Swap [Member] | Readily Available Market Prices (Level 1) [Member]
Financial Assets:
Customer interest rate swaps	0	0
Financial Liabilities:
Junior subordinated debt interest rate swaps	0	0
Customer interest rate swaps	0	0
Interest Rate Swap [Member] | Observable Market Data (Level 2) [Member]
Financial Assets:
Customer interest rate swaps	1,945,000	3,166,000
Financial Liabilities:
Junior subordinated debt interest rate swaps	8,372,000	9,229,000
Customer interest rate swaps	1,945,000	3,166,000
Interest Rate Swap [Member] | Observable Market Data (Level 2) [Member] | Fair Value, Measurements, Recurring [Member]
Financial Assets:
Customer interest rate swaps	1,945,000
Financial Liabilities:
Customer interest rate swaps	1,945,000	3,166,000
Interest Rate Swap [Member] | Company Determined Fair Value (Level 3) [Member]
Financial Assets:
Customer interest rate swaps	0	0
Financial Liabilities:
Junior subordinated debt interest rate swaps	0	0
Customer interest rate swaps	0	0
Interest Rate Lock Commitments [Member]
Financial Assets:
Customer interest rate swaps	202,000	229,000
Financial Liabilities:
Customer interest rate swaps	15,000	90,000
Interest Rate Lock Commitments [Member] | Fair Value, Measurements, Recurring [Member]
Financial Assets:
Customer interest rate swaps	202,000	3,166,000
Financial Liabilities:
Customer interest rate swaps	15,000	90,000
Interest Rate Lock Commitments [Member] | Readily Available Market Prices (Level 1) [Member]
Financial Assets:
Customer interest rate swaps	0	0
Financial Liabilities:
Customer interest rate swaps	0	0
Interest Rate Lock Commitments [Member] | Observable Market Data (Level 2) [Member]
Financial Assets:
Customer interest rate swaps	202,000	229,000
Financial Liabilities:
Customer interest rate swaps	15,000	90,000
Interest Rate Lock Commitments [Member] | Observable Market Data (Level 2) [Member] | Fair Value, Measurements, Recurring [Member]
Financial Assets:
Customer interest rate swaps	202,000	3,166,000
Financial Liabilities:
Customer interest rate swaps	15,000	90,000
Interest Rate Lock Commitments [Member] | Company Determined Fair Value (Level 3) [Member]
Financial Assets:
Customer interest rate swaps	0	0
Financial Liabilities:
Customer interest rate swaps	0	0
Interest Rate Lock Commitments [Member] | Company Determined Fair Value (Level 3) [Member] | Fair Value, Measurements, Recurring [Member]
Financial Liabilities:
Customer interest rate swaps	0	0
Forward Contracts [Member]
Financial Assets:
Customer interest rate swaps	587,000
Financial Liabilities:
Customer interest rate swaps	309,000
Forward Contracts [Member] | Fair Value, Measurements, Recurring [Member]
Financial Assets:
Customer interest rate swaps	587,000	229,000
Financial Liabilities:
Customer interest rate swaps	309,000
Forward Contracts [Member] | Readily Available Market Prices (Level 1) [Member]
Financial Assets:
Customer interest rate swaps	0
Financial Liabilities:
Customer interest rate swaps	0
Forward Contracts [Member] | Observable Market Data (Level 2) [Member]
Financial Assets:
Customer interest rate swaps	587,000
Financial Liabilities:
Customer interest rate swaps	309,000
Forward Contracts [Member] | Observable Market Data (Level 2) [Member] | Fair Value, Measurements, Recurring [Member]
Financial Assets:
Customer interest rate swaps	587,000	229,000
Financial Liabilities:
Customer interest rate swaps	309,000
Forward Contracts [Member] | Company Determined Fair Value (Level 3) [Member]
Financial Assets:
Customer interest rate swaps	0
Financial Liabilities:
Customer interest rate swaps	0
Forward-Starting Interest Rate Swap [Member]
Financial Liabilities:
Junior subordinated debt interest rate swaps	389,000	576,000
Forward-Starting Interest Rate Swap [Member] | Fair Value, Measurements, Recurring [Member]
Financial Liabilities:
Junior subordinated debt interest rate swaps	389,000	576,000
Forward-Starting Interest Rate Swap [Member] | Readily Available Market Prices (Level 1) [Member]
Financial Liabilities:
Junior subordinated debt interest rate swaps	0	0
Forward-Starting Interest Rate Swap [Member] | Observable Market Data (Level 2) [Member]
Financial Liabilities:
Junior subordinated debt interest rate swaps	389,000	576,000
Forward-Starting Interest Rate Swap [Member] | Observable Market Data (Level 2) [Member] | Fair Value, Measurements, Recurring [Member]
Financial Liabilities:
Junior subordinated debt interest rate swaps	389,000	576,000
Forward-Starting Interest Rate Swap [Member] | Company Determined Fair Value (Level 3) [Member]
Financial Liabilities:
Junior subordinated debt interest rate swaps	$ 0	0
Other Assets [Member] | Interest Rate Swap [Member] | Fair Value, Measurements, Recurring [Member]
Financial Assets:
Customer interest rate swaps		705,000
Other Assets [Member] | Interest Rate Swap [Member] | Observable Market Data (Level 2) [Member] | Fair Value, Measurements, Recurring [Member]
Financial Assets:
Customer interest rate swaps		$ 705,000

Fair Value (Summary of Assets M

Fair Value (Summary of Assets Measured at Fair Value on Non Recurring Basis) (Details) - USD ($)		12 Months Ended
		Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financing Receivable, Individually Evaluated for Impairment		$ 20,254,000	$ 15,235,000	$ 12,924,000
non-financial assets measured at fair value on recurring basis		0
Goodwill impairment		0	0	0
Assets, Fair Value Disclosure		22,614,000	18,449,000	14,261,000
Impaired Loans Collateral Dependent [Member] | Fair Value, Measurements, Nonrecurring [Member]
Assets:
Assets, Fair Value Disclosure		500,000	1,971,000
Impaired Loans Collateral Dependent [Member] | Fair Value, Measurements, Nonrecurring [Member] | Company Determined Fair Value (Level 3) [Member]
Assets:
Assets, Fair Value Disclosure		500,000	1,971,000
Servicing Contracts [Member] | Fair Value, Measurements, Nonrecurring [Member]
Assets:
Assets, Fair Value Disclosure	[1]	1,090,000	440,000
Servicing Contracts [Member] | Fair Value, Measurements, Nonrecurring [Member] | Observable Market Data (Level 2) [Member]
Assets:
Assets, Fair Value Disclosure	[1]	1,090,000	440,000
Other Real Estate Owned [Member] | Fair Value, Measurements, Nonrecurring [Member]
Assets:
Assets, Fair Value Disclosure		922,000	1,304,000
Other Real Estate Owned [Member] | Fair Value, Measurements, Nonrecurring [Member] | Company Determined Fair Value (Level 3) [Member]
Assets:
Assets, Fair Value Disclosure		922,000	1,304,000
Minimum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financing Receivable, Individually Evaluated for Impairment		250,000
Consumer loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financing Receivable, Individually Evaluated for Impairment		7,000	74,000	157,000
Commercial loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financing Receivable, Individually Evaluated for Impairment		$ 2,028,000	$ 3,937,000	$ 646,000
[1]	Represents MSRs deemed to be impaired and a valuation allowance was established to carry at fair value at December 31, 2016 and 2015.

Fair Value (Valuation Methodolo

Fair Value (Valuation Methodology and Unobservable Inputs for Level Three Assets Measured at Fair Value on Non Recurring Basis) (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2016	Dec. 31, 2015
Other real estate owned [Member] | Fair Value, Measurements, Nonrecurring [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value		$ 922	$ 1,304
Company Determined Fair Value (Level 3) [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Estimated selling cost			10.00%
Company Determined Fair Value (Level 3) [Member] | Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Estimated selling cost			10.00%
Company Determined Fair Value (Level 3) [Member] | Weighted Average [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Estimated selling cost			10.00%
Company Determined Fair Value (Level 3) [Member] | Impaired Loans Partially Charged Off [Member] | Market Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value		$ 166	$ 399
Company Determined Fair Value (Level 3) [Member] | Impaired Loans Partially Charged Off [Member] | Market Approach Valuation Technique [Member] | Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Estimated selling cost		0.00%	0.00%
Fair Value Inputs, Discount Rate		0.00%	0.00%
Company Determined Fair Value (Level 3) [Member] | Impaired Loans Partially Charged Off [Member] | Market Approach Valuation Technique [Member] | Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Estimated selling cost		10.00%	10.00%
Fair Value Inputs, Discount Rate		0.00%	0.00%
Company Determined Fair Value (Level 3) [Member] | Impaired Loans Partially Charged Off [Member] | Market Approach Valuation Technique [Member] | Weighted Average [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Estimated selling cost		5.00%	7.00%
Fair Value Inputs, Discount Rate		0.00%	0.00%
Company Determined Fair Value (Level 3) [Member] | Impaired Loans Specifically Reserved [Member] | Market Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value	[1]	$ 334	$ 1,572
Company Determined Fair Value (Level 3) [Member] | Impaired Loans Specifically Reserved [Member] | Market Approach Valuation Technique [Member] | Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Estimated selling cost		10.00%	10.00%
Fair Value Inputs, Discount Rate	[1]	0.00%	0.00%
Company Determined Fair Value (Level 3) [Member] | Impaired Loans Specifically Reserved [Member] | Market Approach Valuation Technique [Member] | Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Estimated selling cost		10.00%	10.00%
Fair Value Inputs, Discount Rate	[1]	50.00%	57.00%
Company Determined Fair Value (Level 3) [Member] | Impaired Loans Specifically Reserved [Member] | Market Approach Valuation Technique [Member] | Weighted Average [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Estimated selling cost		10.00%	10.00%
Fair Value Inputs, Discount Rate	[1]	13.00%	45.00%
Company Determined Fair Value (Level 3) [Member] | Other real estate owned [Member] | Market Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value		$ 922	$ 1,304
Company Determined Fair Value (Level 3) [Member] | Other real estate owned [Member] | Market Approach Valuation Technique [Member] | Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Estimated selling cost		10.00%
Fair Value Inputs, Discount Rate		0.00%	0.00%
Company Determined Fair Value (Level 3) [Member] | Other real estate owned [Member] | Market Approach Valuation Technique [Member] | Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Estimated selling cost		10.00%
Fair Value Inputs, Discount Rate		73.00%	43.00%
Company Determined Fair Value (Level 3) [Member] | Other real estate owned [Member] | Market Approach Valuation Technique [Member] | Weighted Average [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Estimated selling cost		10.00%
Fair Value Inputs, Discount Rate		7.00%	18.00%
Company Determined Fair Value (Level 3) [Member] | Other real estate owned [Member] | Fair Value, Measurements, Nonrecurring [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value		$ 922	$ 1,304
[1]	{F|ahBzfndlYmZpbGluZ3MtaHJkcmoLEgZYTUxEb2MiXlhCUkxEb2NHZW5JbmZvOjcxNjM4OWZkMDJjNDRkOTViYTRiZWVmNGFmNDU0ZGNhfFRleHRTZWxlY3Rpb246Njk0NzlCNTgxNjlBNDRGMTAyMjY2RURDNjRDMEFBMUUM}

Fair Value (Carrying Amounts an

Fair Value (Carrying Amounts and Estimated Fair Value for Financial Instrument Assets and Liabilities) (Details) - USD ($) $ in Thousands		Dec. 31, 2016		Dec. 31, 2015		Dec. 31, 2014	Dec. 31, 2013
Financial assets:
Cash and due from banks		$ 87,707		$ 79,488
AFS securities		779,867		750,338
HTM securities		94,609		84,144
Held-to-maturity Securities, Fair Value		94,596		85,647
Loans Held-for-sale, Fair Value Disclosure		14,836		10,958
Servicing Asset at Fair Value, Amount	[2]	1,701	[1]	2,947	[1]	$ 1,447	$ 1,494
Interest Receivable Fair Value Disclosure		8,654		7,985
Financial liabilities:
Deposits		2,826,484		2,726,300
Federal Home Loan Bank Borrowings, Fair Value Disclosure		530,435		479,403
Securities Loaned or Sold under Agreements to Repurchase, Fair Value Disclosure		10,836		36,307
Subordinated debentures		41,660		42,950
Interest payable		534		641
Readily Available Market Prices (Level 1) [Member]
Financial assets:
Cash and due from banks		87,707		79,488
AFS securities		0		0
Held-to-maturity Securities, Fair Value		0		0
Loans Held-for-sale, Fair Value Disclosure		0		0
Servicing Asset at Fair Value, Amount	[1]	0		0
Interest Receivable Fair Value Disclosure		0		0
Financial liabilities:
Deposits		0		0
Federal Home Loan Bank Borrowings, Fair Value Disclosure		0		0
Securities Loaned or Sold under Agreements to Repurchase, Fair Value Disclosure		0		0
Subordinated debentures		0		0
Interest payable		0		0
Observable Market Data (Level 2) [Member]
Financial assets:
Cash and due from banks		0		0
AFS securities		779,867		750,338
Held-to-maturity Securities, Fair Value		94,596		85,647
Loans Held-for-sale, Fair Value Disclosure		14,836		10,958
Servicing Asset at Fair Value, Amount	[1]	1,701		2,947
Interest Receivable Fair Value Disclosure		8,654		7,985
Financial liabilities:
Deposits		2,826,484		2,726,300
Federal Home Loan Bank Borrowings, Fair Value Disclosure		530,435		479,403
Securities Loaned or Sold under Agreements to Repurchase, Fair Value Disclosure		10,836		36,307
Subordinated debentures		41,660		42,950
Interest payable		534		641
Company Determined Fair Value (Level 3) [Member]
Financial assets:
Cash and due from banks		0		0
AFS securities		0		0
Held-to-maturity Securities, Fair Value		0		0
Loans Held-for-sale, Fair Value Disclosure		0		0
Servicing Asset at Fair Value, Amount	[1]	0		0
Interest Receivable Fair Value Disclosure		0		0
Financial liabilities:
Deposits		0		0
Federal Home Loan Bank Borrowings, Fair Value Disclosure		0		0
Securities Loaned or Sold under Agreements to Repurchase, Fair Value Disclosure		0		0
Subordinated debentures		0		0
Interest payable		0		0
Carrying Amount [Member]
Financial assets:
Cash and due from banks		87,707		79,488
AFS securities		779,867		750,338
HTM securities		94,609		84,144
Loans Held-for-sale, Fair Value Disclosure		14,836		10,958
Servicing Asset at Fair Value, Amount	[1]	1,210		2,161
Interest Receivable Fair Value Disclosure		8,654		7,985
Financial liabilities:
Deposits		2,828,529		2,726,379
Federal Home Loan Bank Borrowings, Fair Value Disclosure		530,129		477,852
Securities Loaned or Sold under Agreements to Repurchase, Fair Value Disclosure		10,791		35,911
Subordinated debentures		58,755		58,599
Interest payable		534		641
Residential real estate loans
Financial assets:
Loans receivable, net of allowance	[3]	800,122		820,774
Residential real estate loans | Readily Available Market Prices (Level 1) [Member]
Financial assets:
Loans receivable, net of allowance	[3]	0		0
Residential real estate loans | Observable Market Data (Level 2) [Member]
Financial assets:
Loans receivable, net of allowance	[3]	0		0
Residential real estate loans | Company Determined Fair Value (Level 3) [Member]
Financial assets:
Loans receivable, net of allowance	[3]	800,122		820,774
Residential real estate loans | Carrying Amount [Member]
Financial assets:
Loans receivable, net of allowance	[3]	798,334		808,180
Commercial real estate loans
Financial assets:
Loans receivable, net of allowance	[3]	1,006,249		911,316
Commercial real estate loans | Readily Available Market Prices (Level 1) [Member]
Financial assets:
Loans receivable, net of allowance	[3]	0		0
Commercial real estate loans | Observable Market Data (Level 2) [Member]
Financial assets:
Loans receivable, net of allowance	[3]	0		0
Commercial real estate loans | Company Determined Fair Value (Level 3) [Member]
Financial assets:
Loans receivable, net of allowance	[3]	1,006,249		911,316
Commercial real estate loans | Carrying Amount [Member]
Financial assets:
Loans receivable, net of allowance	[3]	1,038,626		922,257
Commercial loans
Financial assets:
Loans receivable, net of allowance	[3],[4]	391,493		371,854
Commercial loans | Readily Available Market Prices (Level 1) [Member]
Financial assets:
Loans receivable, net of allowance	[3],[4]	0		0
Commercial loans | Observable Market Data (Level 2) [Member]
Financial assets:
Loans receivable, net of allowance	[3],[4]	0		0
Commercial loans | Company Determined Fair Value (Level 3) [Member]
Financial assets:
Loans receivable, net of allowance	[3],[4]	391,493		371,854
Commercial loans | Carrying Amount [Member]
Financial assets:
Loans receivable, net of allowance	[3],[4]	389,624		371,684
Home equity loans
Financial assets:
Loans receivable, net of allowance	[3]	327,292		348,963
Home equity loans | Readily Available Market Prices (Level 1) [Member]
Financial assets:
Loans receivable, net of allowance	[3]	0		0
Home equity loans | Observable Market Data (Level 2) [Member]
Financial assets:
Loans receivable, net of allowance	[3]	0		0
Home equity loans | Company Determined Fair Value (Level 3) [Member]
Financial assets:
Loans receivable, net of allowance	[3]	327,292		348,963
Home equity loans | Carrying Amount [Member]
Financial assets:
Loans receivable, net of allowance	[3]	327,713		349,215
Consumer loans
Financial assets:
Loans receivable, net of allowance	[3]	16,845		18,163
Consumer loans | Readily Available Market Prices (Level 1) [Member]
Financial assets:
Loans receivable, net of allowance	[3]	0		0
Consumer loans | Observable Market Data (Level 2) [Member]
Financial assets:
Loans receivable, net of allowance	[3]	0		0
Consumer loans | Company Determined Fair Value (Level 3) [Member]
Financial assets:
Loans receivable, net of allowance	[3]	16,845		18,163
Consumer loans | Carrying Amount [Member]
Financial assets:
Loans receivable, net of allowance	[3]	17,151		17,704
Fair Value, Measurements, Recurring [Member]
Financial liabilities:
Junior subordinated debt interest rate swaps		8,372		9,229
Fair Value, Measurements, Recurring [Member] | Observable Market Data (Level 2) [Member]
Financial liabilities:
Junior subordinated debt interest rate swaps		8,372		9,229
Forward-Starting Interest Rate Swap [Member]
Financial liabilities:
Junior subordinated debt interest rate swaps		389		576
Forward-Starting Interest Rate Swap [Member] | Readily Available Market Prices (Level 1) [Member]
Financial liabilities:
Junior subordinated debt interest rate swaps		0		0
Forward-Starting Interest Rate Swap [Member] | Observable Market Data (Level 2) [Member]
Financial liabilities:
Junior subordinated debt interest rate swaps		389		576
Forward-Starting Interest Rate Swap [Member] | Company Determined Fair Value (Level 3) [Member]
Financial liabilities:
Junior subordinated debt interest rate swaps		0		0
Forward-Starting Interest Rate Swap [Member] | Carrying Amount [Member]
Financial liabilities:
Junior subordinated debt interest rate swaps		389		576
Forward-Starting Interest Rate Swap [Member] | Fair Value, Measurements, Recurring [Member]
Financial liabilities:
Junior subordinated debt interest rate swaps		389		576
Forward-Starting Interest Rate Swap [Member] | Fair Value, Measurements, Recurring [Member] | Observable Market Data (Level 2) [Member]
Financial liabilities:
Junior subordinated debt interest rate swaps		389		576
Interest Rate Swap [Member]
Financial assets:
Interest Rate Derivative Instruments Not Designated as Hedging Instruments, Asset at Fair Value		1,945		3,166
Financial liabilities:
Junior subordinated debt interest rate swaps		8,372		9,229
Interest Rate Derivative Instruments Not Designated as Hedging Instruments, Liability at Fair Value		1,945		3,166
Interest Rate Swap [Member] | Readily Available Market Prices (Level 1) [Member]
Financial assets:
Interest Rate Derivative Instruments Not Designated as Hedging Instruments, Asset at Fair Value		0		0
Financial liabilities:
Junior subordinated debt interest rate swaps		0		0
Interest Rate Derivative Instruments Not Designated as Hedging Instruments, Liability at Fair Value		0		0
Interest Rate Swap [Member] | Observable Market Data (Level 2) [Member]
Financial assets:
Interest Rate Derivative Instruments Not Designated as Hedging Instruments, Asset at Fair Value		1,945		3,166
Financial liabilities:
Junior subordinated debt interest rate swaps		8,372		9,229
Interest Rate Derivative Instruments Not Designated as Hedging Instruments, Liability at Fair Value		1,945		3,166
Interest Rate Swap [Member] | Company Determined Fair Value (Level 3) [Member]
Financial assets:
Interest Rate Derivative Instruments Not Designated as Hedging Instruments, Asset at Fair Value		0		0
Financial liabilities:
Junior subordinated debt interest rate swaps		0		0
Interest Rate Derivative Instruments Not Designated as Hedging Instruments, Liability at Fair Value		0		0
Interest Rate Swap [Member] | Carrying Amount [Member]
Financial assets:
Interest Rate Derivative Instruments Not Designated as Hedging Instruments, Asset at Fair Value		1,945		3,166
Financial liabilities:
Junior subordinated debt interest rate swaps		8,372		9,229
Interest Rate Derivative Instruments Not Designated as Hedging Instruments, Liability at Fair Value		1,945		3,166
Interest Rate Swap [Member] | Fair Value, Measurements, Recurring [Member]
Financial assets:
Interest Rate Derivative Instruments Not Designated as Hedging Instruments, Asset at Fair Value		1,945
Financial liabilities:
Interest Rate Derivative Instruments Not Designated as Hedging Instruments, Liability at Fair Value		1,945		3,166
Interest Rate Swap [Member] | Fair Value, Measurements, Recurring [Member] | Observable Market Data (Level 2) [Member]
Financial assets:
Interest Rate Derivative Instruments Not Designated as Hedging Instruments, Asset at Fair Value		1,945
Financial liabilities:
Interest Rate Derivative Instruments Not Designated as Hedging Instruments, Liability at Fair Value		1,945		3,166
Interest Rate Lock Commitments [Member]
Financial assets:
Interest Rate Derivative Instruments Not Designated as Hedging Instruments, Asset at Fair Value		202		229
Financial liabilities:
Interest Rate Derivative Instruments Not Designated as Hedging Instruments, Liability at Fair Value		15		90
Interest Rate Lock Commitments [Member] | Readily Available Market Prices (Level 1) [Member]
Financial assets:
Interest Rate Derivative Instruments Not Designated as Hedging Instruments, Asset at Fair Value		0		0
Financial liabilities:
Interest Rate Derivative Instruments Not Designated as Hedging Instruments, Liability at Fair Value		0		0
Interest Rate Lock Commitments [Member] | Observable Market Data (Level 2) [Member]
Financial assets:
Interest Rate Derivative Instruments Not Designated as Hedging Instruments, Asset at Fair Value		202		229
Financial liabilities:
Interest Rate Derivative Instruments Not Designated as Hedging Instruments, Liability at Fair Value		15		90
Interest Rate Lock Commitments [Member] | Company Determined Fair Value (Level 3) [Member]
Financial assets:
Interest Rate Derivative Instruments Not Designated as Hedging Instruments, Asset at Fair Value		0		0
Financial liabilities:
Interest Rate Derivative Instruments Not Designated as Hedging Instruments, Liability at Fair Value		0		0
Interest Rate Lock Commitments [Member] | Carrying Amount [Member]
Financial assets:
Interest Rate Derivative Instruments Not Designated as Hedging Instruments, Asset at Fair Value		202		0
Financial liabilities:
Interest Rate Derivative Instruments Not Designated as Hedging Instruments, Liability at Fair Value		15		90
Interest Rate Lock Commitments [Member] | Fair Value, Measurements, Recurring [Member]
Financial assets:
Interest Rate Derivative Instruments Not Designated as Hedging Instruments, Asset at Fair Value		202		3,166
Financial liabilities:
Interest Rate Derivative Instruments Not Designated as Hedging Instruments, Liability at Fair Value		15		90
Interest Rate Lock Commitments [Member] | Fair Value, Measurements, Recurring [Member] | Observable Market Data (Level 2) [Member]
Financial assets:
Interest Rate Derivative Instruments Not Designated as Hedging Instruments, Asset at Fair Value		202		3,166
Financial liabilities:
Interest Rate Derivative Instruments Not Designated as Hedging Instruments, Liability at Fair Value		15		90
Interest Rate Lock Commitments [Member] | Fair Value, Measurements, Recurring [Member] | Company Determined Fair Value (Level 3) [Member]
Financial liabilities:
Interest Rate Derivative Instruments Not Designated as Hedging Instruments, Liability at Fair Value		0		0
Forward Contracts [Member]
Financial assets:
Interest Rate Derivative Instruments Not Designated as Hedging Instruments, Asset at Fair Value		587
Financial liabilities:
Interest Rate Derivative Instruments Not Designated as Hedging Instruments, Liability at Fair Value		309
Forward Contracts [Member] | Readily Available Market Prices (Level 1) [Member]
Financial assets:
Interest Rate Derivative Instruments Not Designated as Hedging Instruments, Asset at Fair Value		0
Financial liabilities:
Interest Rate Derivative Instruments Not Designated as Hedging Instruments, Liability at Fair Value		0
Forward Contracts [Member] | Observable Market Data (Level 2) [Member]
Financial assets:
Interest Rate Derivative Instruments Not Designated as Hedging Instruments, Asset at Fair Value		587
Financial liabilities:
Interest Rate Derivative Instruments Not Designated as Hedging Instruments, Liability at Fair Value		309
Forward Contracts [Member] | Company Determined Fair Value (Level 3) [Member]
Financial assets:
Interest Rate Derivative Instruments Not Designated as Hedging Instruments, Asset at Fair Value		0
Financial liabilities:
Interest Rate Derivative Instruments Not Designated as Hedging Instruments, Liability at Fair Value		0
Forward Contracts [Member] | Carrying Amount [Member]
Financial assets:
Interest Rate Derivative Instruments Not Designated as Hedging Instruments, Asset at Fair Value		587
Financial liabilities:
Interest Rate Derivative Instruments Not Designated as Hedging Instruments, Liability at Fair Value		309
Forward Contracts [Member] | Fair Value, Measurements, Recurring [Member]
Financial assets:
Interest Rate Derivative Instruments Not Designated as Hedging Instruments, Asset at Fair Value		587		229
Financial liabilities:
Interest Rate Derivative Instruments Not Designated as Hedging Instruments, Liability at Fair Value		309
Forward Contracts [Member] | Fair Value, Measurements, Recurring [Member] | Observable Market Data (Level 2) [Member]
Financial assets:
Interest Rate Derivative Instruments Not Designated as Hedging Instruments, Asset at Fair Value		587		$ 229
Financial liabilities:
Interest Rate Derivative Instruments Not Designated as Hedging Instruments, Liability at Fair Value		$ 309
[1]	Reported fair value represents all MSRs currently being serviced by the Company at December 31, 2015.
[2]	Reported fair value represents all MSRs currently being serviced by the Company.
[3]	(1)The presented carrying amount is net of the allocated ALL.
[4]	(2)Includes the HPFC loan portfolio.

Regulatory Capital Requireme120

Regulatory Capital Requirements (Details) - USD ($) $ in Thousands	Oct. 08, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2008
Total risk-based capital:
Actual Regulatory Capital - Amount		$ 368,856	$ 335,740
Capital To Risk Weighted Assets		14.04%	12.98%
Minimum Requirement for capital Adequacy Including Capital Buffer Total Risk-Based Capital Ratio		8.63%
Minimum Regulatory Capital Required - Ratio		8.00%	8.00%
Tier 1 capital:
Actual Regulatory Capital - Amount		$ 330,729	$ 299,552
Actual Regulatory Capital - Ratio		12.59%	11.58%
Minimum Requirement for capital Adequacy Including Capital Buffer Tier I Risk-Based Capital Ratio		6.63%
Minimum Regulatory Capital Required - Ratio		6.00%	6.00%
Common equity tier I capital		$ 296,120	$ 269,350
Tier 1 leverage capital ratio:
Actual Regulatory Capital - Amount		$ 330,729	$ 299,552
Actual Regulatory Capital - Ratio		8.83%	8.74%
Minimum Regulatory Capital Required - Ratio		4.00%	4.00%
Common Equity Tier I Risk Based Capital Ratio		11.27%	10.42%
Minimum Requirement for capital Adequacy Including Capital Buffer Common Equity Tier I Risk-Based Capital Ratio		5.13%
Common Equity Tier One Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets		4.50%	4.50%
Capital Conservation Buffer		2.50%
Value Of Trust Preferred Securities Included In Tier One Capital		$ 43,000	$ 43,000	$ 43,000
Subordinated Debt	$ 15,000	$ 58,755	58,599
Debt Instrument, Term	10 years	10 years
Subordinated Borrowing, Interest Rate	5.50%
Subsidiaries [Member]
Total risk-based capital:
Actual Regulatory Capital - Amount		$ 340,908	$ 304,847
Capital To Risk Weighted Assets		12.92%	11.75%
Minimum Requirement for capital Adequacy Including Capital Buffer Total Risk-Based Capital Ratio		8.63%
Minimum Regulatory Capital Required - Ratio			8.00%
Minimum Regulatory Provision To Be Well Capitalized - Ratio		10.00%	10.00%
Tier 1 capital:
Actual Regulatory Capital - Amount		$ 317,782	$ 283,659
Actual Regulatory Capital - Ratio		12.05%	10.93%
Minimum Requirement for capital Adequacy Including Capital Buffer Tier I Risk-Based Capital Ratio		6.63%
Minimum Regulatory Capital Required - Ratio			6.00%
Minimum Regulatory Provision To Be Well Capitalized - Ratio		8.00%	8.00%
Common equity tier I capital		$ 317,782	$ 283,659
Tier 1 leverage capital ratio:
Actual Regulatory Capital - Amount		$ 317,782	$ 283,659
Actual Regulatory Capital - Ratio		8.54%	8.33%
Minimum Regulatory Capital Required - Ratio		4.00%	4.00%
Minimum Regulatory Provision To Be Well Capitalized - Ratio		5.00%	5.00%
Common Equity Tier I Risk Based Capital Ratio		12.05%	10.93%
Minimum Requirement for capital Adequacy Including Capital Buffer Common Equity Tier I Risk-Based Capital Ratio		5.13%
Common Equity Tier One Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets			4.50%
Common Equity Tier One Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets		6.50%	6.50%
Tier II Capital [Domain]
Tier 1 leverage capital ratio:
Subordinated Debt		$ 15,000	$ 15,000
Minimum [Member]
Tier 1 leverage capital ratio:
Capital Conservation Buffer		0.625%

Parent Company Financial Sta121

Parent Company Financial Statements (Statements of Condition) (Details) - USD ($) $ in Thousands		Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
ASSETS
Cash		$ 50,300	$ 42,900
Premises and equipment, net		42,873	45,959
Investment in subsidiaries:
Other assets		21,268	34,658
Total assets		3,864,230	3,709,344
LIABILITIES AND SHAREHOLDERS' EQUITY
Accrued interest and other liabilities		44,479	47,413
Shareholders’ equity		391,547	363,190	$ 245,109	$ 231,096
Total liabilities and shareholders’ equity		3,864,230	3,709,344
Parent Company [Member]
ASSETS
Cash		29,905	26,581
Investment in subsidiaries:
Bank		429,100	394,404
Acadia Trust(1)	[1]		10,232
Receivable from subsidiaries		107	1,926
Other assets		12,420	13,939
Total assets		471,532	447,082
LIABILITIES AND SHAREHOLDERS' EQUITY
Due to subsidiaries		37	1,216
Subordinated debentures		58,755	58,590
Accrued interest and other liabilities		21,193	24,086
Shareholders’ equity		391,547	363,190
Total liabilities and shareholders’ equity		$ 471,532	$ 447,082
[1]	(1) Effective at the close of business November 30, 2016, Acadia Trust merged into Camden National Bank.

Parent Company Financial Sta122

Parent Company Financial Statements (Statements of Income) (Details) - USD ($) $ in Thousands	3 Months Ended										12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	[1]	Dec. 31, 2015	[2]	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Condensed Financial Statements, Captions [Line Items]
Interest on borrowings											$ 4,506	$ 3,457	$ 3,329
Salaries and employee benefits											48,072	37,220	32,669
Furniture, equipment and data processing											9,557	8,057	7,316
Net occupancy costs											7,088	5,695	5,055
Income before income tax expense	$ 15,632	$ 15,945	$ 13,874	$ 12,088		$ 2,408		$ 9,583	$ 10,534	$ 8,334	57,539	30,859	36,010
Income tax benefit	(4,730)	(5,042)	(4,258)	(3,442)		(716)		(3,127)	(3,341)	(2,723)	(17,472)	(9,907)	(11,440)
Net income	$ 10,902	$ 10,903	$ 9,616	$ 8,646		$ 1,692		$ 6,456	$ 7,193	$ 5,611	40,067	20,952	24,570
Parent Company [Member]
Condensed Financial Statements, Captions [Line Items]
Dividend income from subsidiaries											16,000	39,200	12,800
Other income (loss)											239	(18)	104
Total operating income											16,239	39,182	12,904
Interest on borrowings											3,415	2,734	2,532
Fees to Bank											160	160	160
Other operating expenses											748	469	453
Total operating expenses											4,323	3,363	3,145
Income before equity in undistributed earnings of subsidiaries and income taxes											11,916	35,819	9,759
Equity in undistributed income (losses) of subsidiaries											26,773	(15,999)	13,799
Income before income tax expense											38,689	19,820	23,558
Income tax benefit											1,378	1,132	1,012
Net income											$ 40,067	$ 20,952	$ 24,570
[1]	(1)In the second quarter of 2016, the Company adopted ASU 2016-09 effective as of January 1, 2016. As such, first quarter 2016 financial results have been restated from previously reported within Form 10-Q.
[2]	On October 16, 2015, the Company completed its acquisition of SBM. Fourth quarter 2015 results of operations include revenues and expenses incurred as a combined organization from the acquisition date through December 31, 2015. The decrease in basic and diluted EPS in the fourth quarter of 2015 was due to acquisition costs and the issuance of 4.1 million shares of Company common stock (as adjusted for the three-for-two common stock split effective September 30, 2016) in connection with the acquisition. Refer to Note 2 for additional details of the acquisition

Parent Company Financial Sta123

Parent Company Financial Statements (Statements of Cash Flows) (Details) - USD ($)	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
Operating Activities
Net income	$ 10,902,000	$ 10,903,000	$ 9,616,000	$ 8,646,000	[1]	$ 1,692,000	[2]	$ 6,456,000	$ 7,193,000	$ 5,611,000	$ 40,067,000	$ 20,952,000	$ 24,570,000
Depreciation and amortization expense											4,426,000	3,614,000	3,051,000
Stock-based compensation expense											1,997,000	836,000	599,000
(Increase) decrease in other assets											11,329,000	(7,062,000)	(3,349,000)
Net cash provided by operating activities											57,418,000	15,918,000	29,886,000
Investing Activities
Proceeds from sale of assets											90,000	0	0
Purchase of premises and equipment											(1,671,000)	(3,189,000)	(1,316,000)
Net cash used in investing activities											(167,953,000)	(54,744,000)	(170,512,000)
Financing Activities
Issuance of subordinated debt, net of issuance costs											0	14,464,000	0
Exercise of stock options and issuance of restricted stock, net of repurchase for tax withholdings and tax benefit											(894,000)	(753,000)	(328,000)
Equity issuance costs											0	(612,000)	0
Common stock repurchases											0	0	(7,475,000)
Cash dividends paid on common stock and cash in lieu for fractional shares paid due to stock split											(12,394,000)	(9,785,000)	(8,085,000)
Net cash provided by financing activities											118,754,000	57,501,000	150,084,000
Net increase in cash and cash equivalents											8,219,000	18,675,000	9,458,000
Cash and cash equivalents at beginning of year				79,488,000						60,813,000	79,488,000	60,813,000	51,355,000
Cash and cash equivalents at end of year	87,707,000					79,488,000					87,707,000	79,488,000	60,813,000
Parent Company [Member]
Operating Activities
Net income											40,067,000	20,952,000	24,570,000
Equity in undistributed (income) losses of subsidiaries											(26,651,000)	4,573,000	(13,799,000)
Depreciation and amortization expense											(4,000)	0	0
(Increase) decrease in receivable from subsidiaries											1,819,000	(1,901,000)	2,037,000
(Increase) decrease in other assets											1,213,000	(2,175,000)	165,000
Increase (decrease) in due to subsidiaries											(1,179,000)	1,216,000	0
Increase (decrease) in other liabilities											(2,519,000)	320,000	(2,106,000)
Net cash provided by operating activities											12,746,000	22,985,000	10,867,000
Investing Activities
Acquisition of SBM, net of cash acquired											0	(25,319,000)	0
Proceeds from Sale of Available-for-sale Securities, Equity											80,000	0	0
Proceeds from sale of assets											0	0	5,237,000
Net cash used in investing activities											80,000	(25,319,000)	5,237,000
Financing Activities
Issuance of subordinated debt, net of issuance costs											0	14,464,000	0
Exercise of stock options and issuance of restricted stock, net of repurchase for tax withholdings and tax benefit											(894,000)	(753,000)	(328,000)
Capital contribution from subsidiaries											1,997,000	836,000	599,000
Equity issuance costs											0	(612,000)	0
Common stock repurchases											0	0	(7,475,000)
Cash dividends paid on common stock and cash in lieu for fractional shares paid due to stock split											(12,393,000)	(9,785,000)	(8,085,000)
Net cash provided by financing activities											(9,502,000)	5,656,000	(14,633,000)
Net increase in cash and cash equivalents											3,324,000	3,322,000	1,471,000
Cash and cash equivalents at beginning of year				$ 26,581,000						$ 23,259,000	26,581,000	23,259,000	21,788,000
Cash and cash equivalents at end of year	$ 29,905,000					$ 26,581,000					$ 29,905,000	$ 26,581,000	$ 23,259,000
[1]	(1)In the second quarter of 2016, the Company adopted ASU 2016-09 effective as of January 1, 2016. As such, first quarter 2016 financial results have been restated from previously reported within Form 10-Q.
[2]	On October 16, 2015, the Company completed its acquisition of SBM. Fourth quarter 2015 results of operations include revenues and expenses incurred as a combined organization from the acquisition date through December 31, 2015. The decrease in basic and diluted EPS in the fourth quarter of 2015 was due to acquisition costs and the issuance of 4.1 million shares of Company common stock (as adjusted for the three-for-two common stock split effective September 30, 2016) in connection with the acquisition. Refer to Note 2 for additional details of the acquisition

Quarterly Results of Operati124

Quarterly Results of Operations (Unaudited) (Details) $ / shares in Units, $ in Thousands	3 Months Ended																9 Months Ended	12 Months Ended
	Dec. 31, 2016USD ($)$ / shares		Sep. 30, 2016USD ($)$ / shares		Jun. 30, 2016USD ($)$ / shares		Mar. 31, 2016USD ($)$ / shares	[1]	Dec. 31, 2015USD ($)$ / shares	[2]	Sep. 30, 2015USD ($)$ / shares		Jun. 30, 2015USD ($)$ / shares		Mar. 31, 2015USD ($)$ / shares		Sep. 30, 2016	Dec. 31, 2016USD ($)$ / sharesshares		Dec. 31, 2015USD ($)$ / shares		Dec. 31, 2014USD ($)$ / sharesshares
Effect of Fourth Quarter Events [Line Items]
Stockholders' Equity Note, Stock Split, Conversion Ratio																	1.5	1.5
Interest income	$ 32,276		$ 32,594		$ 32,775		$ 31,981		$ 29,983		$ 23,056		$ 23,657		$ 22,448			$ 129,626		$ 99,144		$ 88,385
Interest expense	4,032		4,222		4,271		4,029		3,612		3,044		3,022		3,014			16,554		12,692		12,128
Net interest income	28,244		28,372		28,504		27,952		26,371		20,012		20,635		19,434			113,072		86,452		76,257
Provision for credit losses	255		1,279		2,852		872		957		279		254		446			5,258		1,936		2,220
Non-interest income	10,151		11,001		10,552		7,917		8,464		6,561		6,310		6,147			39,621		27,482		24,370
Non-interest expense	22,508		22,149		22,330		22,909		31,470		16,711		16,157		16,801			89,896		81,139		62,397
Income before income tax expense	15,632		15,945		13,874		12,088		2,408		9,583		10,534		8,334			57,539		30,859		36,010
Income tax expense	4,730		5,042		4,258		3,442		716		3,127		3,341		2,723			17,472		9,907		11,440
Net income	$ 10,902		$ 10,903		$ 9,616		$ 8,646		$ 1,692		$ 6,456		$ 7,193		$ 5,611			$ 40,067		$ 20,952		$ 24,570
Per common share:
Basic earnings per share | $ / shares	$ 0.70	[1],[2],[3]	$ 0.70	[1],[2],[3]	$ 0.62	[1],[2],[3]	$ 0.56	[2],[3]	$ 0.11	[1],[3]	$ 0.58	[1],[2],[3]	$ 0.64	[1],[2],[3]	$ 0.50	[1],[2],[3]		$ 2.59	[4]	$ 1.73	[4]	$ 2.19	[4]
Diluted earnings per share | $ / shares	$ 0.70	[1],[2],[3]	$ 0.70	[1],[2],[3]	$ 0.62	[1],[2],[3]	$ 0.56	[2],[3]	$ 0.11	[1],[3]	$ 0.57	[1],[2],[3]	$ 0.64	[1],[2],[3]	$ 0.50	[1],[2],[3]		$ 2.57	[4]	$ 1.73	[4]	$ 2.19	[4]
Common Stock [Member]
Effect of Fourth Quarter Events [Line Items]
Stock Issued During Period, Shares, Acquisitions | shares																		4,100,000				4,124,643
[1]	(1)In the second quarter of 2016, the Company adopted ASU 2016-09 effective as of January 1, 2016. As such, first quarter 2016 financial results have been restated from previously reported within Form 10-Q.
[2]	On October 16, 2015, the Company completed its acquisition of SBM. Fourth quarter 2015 results of operations include revenues and expenses incurred as a combined organization from the acquisition date through December 31, 2015. The decrease in basic and diluted EPS in the fourth quarter of 2015 was due to acquisition costs and the issuance of 4.1 million shares of Company common stock (as adjusted for the three-for-two common stock split effective September 30, 2016) in connection with the acquisition. Refer to Note 2 for additional details of the acquisition
[3]	(3)Earnings per share amounts have been adjusted to reflect the three-for-two split effective September 30, 2016, for all periods presented. Refer to Note 13.
[4]	(2)Share and per share amounts have been adjusted to reflect the three-for-two split effective September 30, 2016, for all periods presented. Refer to Note 13.