Bankwell Financial (BWFG) 10-K 16 Mar 17 2016 FY Annual report Financial data

Document and Entity Information

Document and Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2016	Feb. 28, 2017	Jun. 30, 2016
Document And Entity Information [Abstract]
Entity Registrant Name	Bankwell Financial Group, Inc.
Entity Central Index Key	1,505,732
Trading Symbol	bwfg
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Current Fiscal Year End Date	--12-31
Entity Filer Category	Accelerated Filer
Entity Well-known Seasoned Issuer	No
Entity Common Stock, Shares Outstanding		7,629,315
Entity Public Float			$ 126,477,348
Document Type	10-K
Document Period End Date	Dec. 31, 2016
Amendment Flag	false
Document Fiscal Year Focus	2,016
Document Fiscal Period Focus	FY

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
ASSETS
Cash and due from banks	$ 96,026	$ 49,562
Federal funds sold	329	39,035
Cash and cash equivalents	96,355	88,597
Held to maturity investment securities, at amortized cost	16,859	10,226
Available for sale investment securities, at fair value	87,751	40,581
Loans held for sale	254
Loans receivable (net of allowance for loan losses of $17,982 and $14,169 at December 31, 2016 and 2015, respectively)	1,343,895	1,129,748
Foreclosed real estate	272	1,248
Accrued interest receivable	4,958	4,071
Federal Home Loan Bank stock, at cost	7,943	6,554
Premises and equipment, net	17,835	11,163
Bank-owned life insurance	33,448	23,755
Goodwill	2,589	2,589
Other intangible assets	501	652
Deferred income taxes, net	9,085	8,337
Other assets	7,174	2,851
Total assets	1,628,919	1,330,372
Deposits
Noninterest bearing deposits	187,593	164,553
Interest bearing deposits	1,101,444	882,389
Total deposits	1,289,037	1,046,942
Advances from the Federal Home Loan Bank	160,000	120,000
Subordinated debentures	25,051	25,000
Accrued expenses and other liabilities	8,936	6,661
Total liabilities	1,483,024	1,198,603
Commitments and contingencies (Note 11)
Shareholders' equity
Common stock, no par value; 10,000,000 shares authorized, 7,620,663 and 7,516,291 shares issued at December 31, 2016 and 2015, respectively	115,353	112,579
Retained earnings	29,652	18,963
Accumulated other comprehensive income	890	227
Total shareholders' equity	145,895	131,769
Total liabilities and shareholders' equity	$ 1,628,919	$ 1,330,372

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parentheticals) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Statement of Financial Position [Abstract]
Allowance for loan losses (in dollars)	$ 17,982	$ 14,169
Common stock, no par value (in dollars per share)	$ 0	$ 0
Common stock, share authorized	10,000,000	10,000,000
Common stock, share issued	7,620,663	7,516,291

Consolidated Statements of Inco

Consolidated Statements of Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Interest and dividend income
Interest and fees on loans	$ 58,077	$ 48,692	$ 33,403
Interest and dividends on securities	2,740	1,964	2,058
Interest on cash and cash equivalents	173	98	128
Total interest and dividend income	60,990	50,754	35,589
Interest expense
Interest expense on deposits	8,300	5,681	3,295
Interest on borrowings	3,598	2,285	634
Total interest expense	11,898	7,966	3,929
Net interest income	49,092	42,788	31,660
Provision for loan losses	3,914	3,230	2,152
Net interest income after provision for loan losses	45,178	39,558	29,508
Noninterest income
Service charges and fees	963	933	643
Bank owned life insurance	693	727	497
Gains and fees from sales of loans	466	1,113	1,313
Gain on sale of foreclosed real estate	128
Loss on sale of available for sale securities, net	(115)
Other	541	711	588
Total noninterest income	2,676	3,484	3,041
Noninterest expense
Salaries and employee benefits	15,956	16,065	13,534
Occupancy and equipment	5,811	5,341	4,422
Professional services	1,654	1,447	1,194
Data processing	1,603	1,523	1,289
Marketing	948	985	674
FDIC insurance	660	672	488
Director fees	558	622	650
Foreclosed real estate	157	168	36
Amortization of intangibles	151	196	133
Merger and acquisition related expenses		2	1,801
Other	2,046	2,150	1,591
Total noninterest expense	29,544	29,171	25,812
Income before income tax expense	18,310	13,871	6,737
Income tax expense	5,960	4,841	2,169
Net income	12,350	9,030	4,568
Net income attributable to common shareholders	$ 12,350	$ 8,905	$ 4,458
Earnings Per Common Share:
Basic (in dollars per share)	$ 1.64	$ 1.23	$ 0.78
Diluted (in dollars per share)	$ 1.62	$ 1.21	$ 0.78
Weighted Average Common Shares Outstanding:
Basic (in shares)	7,396,019	7,071,550	5,577,942
Diluted (in shares)	7,491,052	7,140,558	5,605,512
Dividends per common share (in dollars per share)	$ 0.22	$ 0.05

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	$ 12,350	$ 9,030	$ 4,568
Unrealized gains (losses) on securities:
Unrealized holding (losses) gains on available for sale securities	(109)	(431)	361
Reclassification adjustment for loss realized in net income	115
Net change in unrealized gain (loss)	6	(431)	361
Income tax effect - (expense) benefit	(2)	192	(141)
Unrealized gains (losses) on securities, net of tax	4	(239)	220
Unrealized gains (losses) on interest rate swaps:
Unrealized gain (losses) on interest rate swaps designated as cash flow hedges	1,013	(89)	(186)
Tax effect - (expense) benefit	(354)	24	73
Unrealized gains (losses) on interest rate swaps, net of tax	659	(65)	(113)
Total other comprehensive income (loss), net of tax	663	(304)	107
Comprehensive income	$ 13,013	$ 8,726	$ 4,675

Consolidated Statements of Shar

Consolidated Statements of Shareholders' Equity - USD ($) $ in Thousands	Preferred Stock	Common Stock	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Total
Balance at Dec. 31, 2013	$ 10,980	$ 52,105	$ 5,976	$ 424	$ 69,485
Balance (in shares) at Dec. 31, 2013		3,876,393
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income			4,568		4,568
Other comprehensive income (loss) , net of tax				107	107
Preferred stock cash dividends			(110)		(110)
Stock-based compensation expense		$ 573			573
Capital from exercise of stock options		207			207
Issuance of 2,702,703 shares, net of expenses		$ 44,704			44,704
Issuance of 2,702,703 shares, net of expenses (in shares)		2,702,703
Issuance of restricted stock (in shares)		127,610
Forfeitures of restricted stock (in shares)		(51,651)
Stock options exercised (in shares)		20,305
Stock issuance from acquisition of Quinnipiac Bank and Trust Company		$ 9,676			9,676
Stock issuance from acquisition of Quinnipiac Bank and Trust Company (in shares)		510,122
Balance at Dec. 31, 2014	10,980	$ 107,265	10,434	531	129,210
Balance (in shares) at Dec. 31, 2014		7,185,482
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income			9,030		9,030
Other comprehensive income (loss) , net of tax				(304)	(304)
Cash dividends declared ($0.05 and $0.22 per share for 2015 and 2016 respectively)			(376)		(376)
Preferred stock cash dividends			(125)		(125)
Redemption of SBLF preferred stock	(10,980)				(10,980)
Stock-based compensation expense		$ 1,033			1,033
Warrants exercised		$ 3,780			3,780
Warrants exercised (in shares)		269,992
Issuance of restricted stock (in shares)		51,800
Forfeitures of restricted stock (in shares)		(25,573)
Stock options exercised		$ 501			501
Stock options exercised (in shares)		34,590
Balance at Dec. 31, 2015		$ 112,579	18,963	227	131,769
Balance (in shares) at Dec. 31, 2015		7,516,291
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income			12,350		12,350
Other comprehensive income (loss) , net of tax				663	663
Cash dividends declared ($0.05 and $0.22 per share for 2015 and 2016 respectively)			(1,661)		(1,661)
Stock-based compensation expense		$ 1,188			1,188
Warrants exercised		$ 200			200
Warrants exercised (in shares)		11,200
Issuance of restricted stock (in shares)		29,935
Forfeitures of restricted stock (in shares)		(883)
Stock options exercised		$ 1,106			1,106
Stock options exercised (in shares)		64,120
Net tax benefit related to stock-based compensation		$ 280			280
Balance at Dec. 31, 2016		$ 115,353	$ 29,652	$ 890	$ 145,895
Balance (in shares) at Dec. 31, 2016		7,620,663

Consolidated Statements of Sha7

Consolidated Statements of Shareholders' Equity (Parentheticals) - $ / shares	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Statement of Stockholders' Equity [Abstract]
Number of common shares issued (in shares)			2,702,703
Cash dividends declared (in shares)	$ 0.22	$ 0.05

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Cash flows from operating activities
Net income	$ 12,350	$ 9,030	$ 4,568
Adjustments to reconcile net income to net cash provided by operating activities:
Net amortization of premiums and discounts on investment securities	1,737	99	124
Provision for loan losses	3,914	3,230	2,152
Provision for deferred taxes	(1,104)	(966)	(696)
Net loss on sales of available for sale securities	115
Depreciation and amortization	1,729	1,685	1,239
Amortization of debt issuance costs	51
Increase in cash surrender value of bank-owned life insurance	(693)	(727)	(497)
Loan principal sold	(7,636)	(30,309)	(27,282)
Proceeds from sales of loans	7,848	32,008	28,109
Net gain on sales of loans	(466)	(1,113)	(1,313)
Stock-based compensation	1,188	1,033	573
Net (accretion) amortization of purchase accounting adjustments	(136)	(104)	656
Loss on sale and write-downs of foreclosed real estate	25	184
Net change in:
Deferred loan fees	466	668	1,120
Accrued interest receivable	(887)	(748)	(619)
Other assets	(3,006)	(519)	58
Accrued expenses and other liabilities	2,275	779	978
Net cash provided by operating activities	17,770	14,230	9,170
Cash flows from investing activities
Proceeds from principal repayments on available for sale securities	770	1,877	10,189
Proceeds from principal repayments on held to maturity securities	205	220	2,353
Net proceeds from sales and calls of available for sale securities	60,696	22,030	15,920
Net proceeds from sales and calls of held to maturity securities		1,000
Purchases of available for sale securities	(110,485)		(53,772)
Purchase of held to maturity securities	(6,835)
Purchase of bank-owned life insurance	(9,000)		(12,500)
Acquisition, net of cash paid			2,546
Net increase in loans	(218,603)	(218,772)	(200,118)
Purchases of premises and equipment	(8,401)	(938)	(2,042)
Purchase of Federal Home Loan Bank stock	(1,389)	(445)	(1,275)
Proceeds from sale of foreclosed real estate	951	400
Net cash used by investing activities	(292,091)	(194,628)	(238,699)
Cash flows from financing activities
Net change in time certificates of deposit	165,224	128,379	111,247
Net change in other deposits	76,930	83,257	(37,973)
Net change in FHLB advances	40,000	(9,000)	78,000
Proceeds from issuance of common stock	200	3,780	44,704
Proceeds from exercise of options	1,106	501	207
Issuance of subordinated debt		25,000
Redemption of SBLF preferred stock		(10,980)
Dividends paid on common stock	(1,661)	(376)
Dividends paid on preferred stock		(125)	(110)
Net tax benefit related to stock-based compensation	280
Net cash provided by financing activities	282,079	220,436	196,075
Net increase (decrease) in cash and cash equivalents	7,758	40,038	(33,454)
Cash and cash equivalents:
Beginning of year	88,597	48,559	82,013
End of period	96,355	88,597	48,559
Cash paid for:
Interest	11,793	7,544	3,985
Income taxes	$ 8,584	6,136	2,222
Acquisition of noncash assets and liabilities:
Assets acquired			112,498
Liabilities assumed			$ (107,958)
Noncash investing and financing activities
Loans transferred to foreclosed real estate		$ 883

Nature of Operations and Summar

Nature of Operations and Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Nature of Operations and Summary of Significant Accounting Policies	1. Nature of Operations and Summary of Significant Accounting Policies Bankwell Financial Group, Inc. (the “Company” or “Bankwell”) is a bank holding company headquartered in New Canaan, Connecticut. The Company offers a broad range of financial services through its banking subsidiary, Bankwell Bank, (the “Bank”). In November 2013, the Bank acquired The Wilton Bank (“Wilton”), which added one branch and approximately $25.1 million in loans and $64.2 million in deposits. In addition, in October 2014, the Bank acquired Quinnipiac Bank and Trust Company (“Quinnipiac”) which added two branches and approximately $97.8 million in loans and $100.6 million in deposits. The Bank is a Connecticut state chartered commercial bank, founded in 2002, whose deposits are insured under the Deposit Insurance Fund administered by the Federal Deposit Insurance Corporation (“FDIC”). The Bank provides a full range of banking services to commercial and consumer customers, primarily concentrated in the New York metropolitan area, including the Fairfield and New Haven County regions of Connecticut, with branch locations in New Canaan, Stamford, Fairfield, Wilton, Norwalk, Hamden and North Haven Connecticut. Many of the Company’s activities are with customers located in the New York Metropolitan area, including Fairfield and New Haven Counties and the surrounding region of Connecticut, and declines in property values in these areas could significantly impact the Company. The Company has significant concentrations in commercial real estate loans. Management does not believe they present any special risk. The Company does not have any significant concentrations in any one industry or customer. Principles of consolidation The consolidated financial statements include the accounts of the Company and the Bank. All significant intercompany accounts and transactions have been eliminated in consolidation. Use of estimates The accounting and reporting policies of the Company conform to accounting principles generally accepted in the United States of America (“GAAP”) and general practices within the banking industry. In preparing the consolidated financial statements, management is required to make estimates and assumptions that affect the reported amounts of assets and liabilities, and disclosures of contingent assets and liabilities as of the date of the consolidated balance sheet and revenue and expenses for the period. Actual results could differ from those estimates. Material estimates that are particularly susceptible to significant change in the near term relate to estimates related to the initial measurement of goodwill and intangible assets and subsequent impairment analyses; the allowance for loan losses; stock-based compensation; and derivative instrument valuation. Segments The Company has one reportable segment. All of the Company’s activities are interrelated, and each activity is dependent and assessed based on how each of the activities of the Company supports the others. For example, lending is dependent upon the ability of the Company to fund itself with deposits and borrowings while managing the interest rate and credit risk. Accordingly, all significant operating decisions are based upon analysis of the Bank as one segment or unit. Basis of consolidated financial statement presentation The consolidated financial statements have been prepared in accordance with GAAP and general practices within the banking industry. Such policies have been followed on a consistent basis. Cash and Cash Equivalents and Statement of Cash Flows Cash and due from banks and federal funds sold are recognized as cash equivalents in the consolidated statements of cash flows. Federal funds sold generally mature in one day. For purposes of reporting cash flows, all highly liquid debt instruments purchased with an original maturity of three months or less are considered to be cash equivalents. Cash flows from loans and deposits are reported net. The balances of cash and due from banks and federal funds sold, at times, may exceed federally insured limits. The Company has not experienced any losses from such concentrations. Investment Securities Management determines the appropriate classifications of investment securities at the date individual investment securities are acquired, and the appropriateness of such classifications is reaffirmed at each balance sheet date. The Company’s investment securities are categorized as either available for sale or held to maturity. Held to maturity investments are carried at amortized cost; available for sale securities are carried at fair value, with unrealized gains and losses excluded from earnings and reported in other comprehensive income (loss) as a separate component of capital, net of estimated income taxes. Investment securities in the available for sale and held-to-maturity portfolios are reviewed quarterly for other-than-temporary impairment (OTTI). If a debt security is below amortized cost, other-than-temporary impairment is deemed to exist if the present value of the expected future cash flows is less than the amortized cost basis of the security. OTTI is required to be recognized regardless of the credit loss component if the Company intends to sell the security or if it is “more-likely-than-not” that the Company will be required to sell the security before recovery of its amortized cost basis. The credit loss component of an other-than-temporary impairment write-down is recorded in earnings, while the remaining portion of the impairment loss is recognized in other comprehensive income (loss), provided the Company does not intend to sell the underlying debt security and it is more-likely-than-not that the Company will not be required to sell the debt security prior to recovery. In determining whether a credit loss exists and the period over which the fair value of the debt security is expected to recover, management considers the following factors: the length of time and extent that fair value has been less than cost, the financial condition and near term prospects of the issuer, any external credit ratings, the level of excess cash flows generated from the underlying collateral supporting the principal and interest payments of the debt securities and the level of credit enhancement provided by the structure. The sale of a held to maturity security within three months of its maturity date or after collection of at least 85% of the principal outstanding at the time the security was acquired is considered a maturity for purposes of classification and disclosure. Purchase premiums and discounts are recognized in interest income using the interest method over the terms of the securities. Gains or losses on the sales of securities are recognized at trade date utilizing the specific identification method. Bank Owned Life Insurance The investment in bank owned life insurance (“BOLI”) represents the cash surrender value of life insurance policies on the lives of certain Bank employees who have provided positive consent allowing the Bank to be the beneficiary of such policies. Increases in the cash value of the policies, as well as insurance proceeds received, are recorded in noninterest income, and are not subject to income taxes. The financial strength of the insurance carrier is reviewed prior to the purchase of BOLI and annually thereafter. Federal Home Loan Bank Stock Federal Home Loan Bank of Boston (“FHLB”) stock is a non-marketable equity security that is carried at cost. There are no quoted market prices for this security and the security is not liquid. The Company can sell these securities back to the FHLB at par. Loans Held For Sale Loans held for sale are those loans which management has the intent to sell in the foreseeable future, and are carried at the lower of aggregate cost or market value. Net unrealized losses, if any, are recognized by a valuation allowance through a charge to noninterest income. Realized gains and losses on the sale of loans are recognized on the settlement date and are determined by the difference between the sale proceeds and the carrying value of the loans. Loans may be sold with servicing rights released or retained. At the time of the sale, management records a servicing asset for the value of any retained servicing rights, which represents the present value of the differential between the contractual servicing fee and adequate compensation, defined as the fee a sub-servicer would require to assume the role of servicer, after considering the estimated effects of prepayments. Loans Receivable Loans receivable that management has the ability and intent to hold for the foreseeable future or until maturity or payoff are stated at their current unpaid principal balances, net of the allowance for loan losses, charge-offs, recoveries, net deferred loan origination fees and unamortized loan premiums. Past due or delinquency status for all loans is based on the number of days past due in accordance with its contractual payment terms. A loan is considered impaired when it is probable that all contractual principal or interest payments due will not be collected in accordance with the terms of the loan agreement. Impaired loans are measured based on the present value of expected future cash flows discounted at the loan’s effective interest rate or, as a practical expedient, at the loan’s observable market price or the fair value of the collateral, if the loan is collateral dependent. The amount of impairment, if any, and any subsequent changes are recorded as adjustments to the allowance for loan losses. Management reviews all nonaccrual loans, other loans past due 90 days or more, and restructured loans for impairment. In most cases, loan payments that are past due less than 90 days are considered minor collection delays and the related loans are not considered to be impaired. Consumer installment loans are considered to be pools of small balance homogeneous loans, which are collectively evaluated for impairment. Modifications to a loan are considered to be a troubled debt restructuring (“TDR”) when two conditions are met: 1) the borrower is experiencing financial difficulties and 2) the modification constitutes a concession. Modified terms are dependent upon the financial position and needs of the individual borrower. Debt may be bifurcated with separate terms for each tranche of the restructured debt. The decision to restructure a loan, versus aggressively enforcing the collection of the loan, may benefit the Company by increasing the ultimate probability of collection. If a performing loan is restructured into a TDR it remains in performing status. If a nonperforming loan is restructured into a TDR, it continues to be carried in nonaccrual status. Nonaccrual classification may be removed if the borrower demonstrates compliance with the modified terms for a minimum of six months. TDR’s are reported as such for at least one year from the date of restructuring. In years after the restructuring, troubled debt restructured loans are removed from this classification if the restructuring agreement specifies a market rate of interest equal to that which would be provided to a borrower with similar credit at the time of restructuring and the loan is not deemed to be impaired based on the modified terms. Acquired Loans Loans that the Company acquires in acquisitions are initially recorded at fair value with no carryover of the related allowance for credit losses. Determining the fair value of acquired loans involves estimating the amount and timing of principal and interest cash flows initially expected to be collected on the loans and discounting those cash flows at an appropriate market rate of interest. For loans which meet the criteria stipulated in Accounting Standards Codification (“ASC”) 310-30, “Loans and Debt Securities Acquired with Deteriorated Credit Quality”, the Company recognizes an accretable yield, which is defined as the excess of all cash flows expected at acquisition over the initial fair value of the loan, as interest income on a level-yield basis over the expected remaining life of the loan. The excess of the loan’s contractually required payments over the cash flows expected to be collected is the nonaccretable difference. The nonaccretable difference is not recognized as an adjustment of yield, a loss accrual, or a valuation allowance. After the initial acquisition, the Company continues to evaluate whether the timing and the amount of cash to be collected are reasonably estimated. Subsequent significant increases in cash flows the Company expects to collect will first reduce previously recognized valuation allowance and then be reflected prospectively as an increase to the level yield. Subsequent decreases in expected cash flows may result in the loan being considered impaired. Interest income is not recognized to the extent that the net investment in the loan would increase to an amount greater than the estimated payoff amount. For ASC 310-30 loans, the expected cash flows reflect anticipated prepayments, determined on a loan by loan basis, according to the anticipated collection plan of these loans. Prepayments result in the recognition of the nonaccretable balance as current period yield. Changes in prepayment assumptions may change the amount of interest income and principal expected to be collected. The expected prepayments used to determine the accretable yield are consistent between the cash flows expected to be collected and projections of contractual cash flows so as to not affect the nonaccretable difference. For loans that do not meet the ASC 310-30 criteria, the Company records interest income on a level yield basis using the contractually required cash flows. The Company subjects loans that do not meet the ASC 310-30 criteria to ASC Topic 450, “Contingencies”, by collectively evaluating these loans for an allowance for loan loss, using the same methodology as loans originated by the Company. Acquired loans that met the criteria for nonaccrual of interest prior to the acquisition are considered performing upon acquisition, regardless of whether the customer is contractually delinquent, if the Company can reasonably estimate the timing and amount of the expected cash flows on such loans and if the Company expects to fully collect the new carrying value of the loans. As such, the Company may no longer consider the loan to be nonaccrual or nonperforming and may accrue interest on these loans, including the impact of any accretable yield. The Company has determined that it can reasonably estimate future cash flows on the Company’s current portfolio of acquired loans that are past due 90 days or more, and on which the Company is accruing interest and the Company expects to fully collect the carrying value of the loans. Allowance For Loan Losses The allowance for loan losses is established as losses are estimated to have occurred through a provision for loan losses charged to earnings. Loan losses are charged against the allowance for loan losses when management believes the non-collectability of a loan balance is confirmed. Subsequent recoveries, if any, are credited to the allowance for loan losses. The allowance for loan losses is evaluated on a regular basis by management and is based upon management’s periodic review of the collectability of the loans in light of historical experience, the nature and volume of the loan portfolio, adverse situations that may affect the borrower’s ability to repay, estimated value of any underlying collateral and prevailing economic conditions. This evaluation is inherently subjective, as it requires estimates that are susceptible to significant revision as more information becomes available. The allowance for loan losses consists of specific and general components. The specific component relates to impaired loans that are classified as doubtful, substandard or special mention. For these loans, an allowance is established when the discounted cash flows, collateral value or observable market price of the impaired loan is lower than the carrying value of that loan. The general component covers non classified loans and is based on historical loss experience adjusted for qualitative factors, and includes unallocated components maintained to cover uncertainties that could affect management’s estimation of probable losses, and reflects the margin of imprecision inherent in the underlying assumptions used in the methodologies for estimating specific and general losses in the portfolio. Management believes the allowance for loan losses is adequate. While management uses available information to recognize losses on loans, future additions to the allowance may be necessary based on changes in economic conditions. In addition, various regulatory agencies, as an integral part of their examination process, periodically review the allowance for loan losses. Such agencies have the authority to require additions to the allowance or charge-offs based on the agencies’ judgments about information available to them at the time of their examination. Interest and Fees on Loans Interest on loans is accrued and included in income based on contractual rates applied to principal amounts outstanding. Accrual of interest is discontinued when loan payments are 90 days or more past due, based on contractual terms, or when, in the judgment of management, collectability of the loan or loan interest becomes uncertain. When interest accrual is discontinued, all unpaid accrued interest is reversed against interest income. Subsequent recognition of income occurs only to the extent payment is received subject to management’s assessment of the collectability of the remaining interest and principal. A nonaccrual loan is restored to accrual status when it is no longer delinquent and collectability of interest and principal is no longer in doubt. Loan origination fees, net of direct loan origination costs, are deferred and amortized as an adjustment to the loan’s yield generally over the contractual life of the loan, utilizing the interest method. Goodwill and Intangibles Goodwill represents the excess of the purchase price over the fair value of the net assets acquired in a business combination. Intangible assets are assets acquired in a business combination that lack physical substance but can be distinguished from goodwill because the intangible asset is capable of being sold or exchanged on its own or in combination with related contracts, assets or liabilities. Intangible assets are amortized on a straight-line or accelerated basis over estimated lives. Goodwill is not amortized. Goodwill and identifiable intangible assets are evaluated for impairment annually or whenever events or changes in circumstances indicate the carrying value of these assets may not be recoverable. When these assets are evaluated for impairment, if the carrying amount exceeds fair value, an impairment charge is recorded to income. The fair value is based on observable market prices, when practicable. Other valuation techniques may be used when market prices are unavailable, including estimated discounted cash flows. This type of analysis contains uncertainties because it requires management to make assumptions and to apply judgment to estimate industry economic factors and the profitability of future business strategies. In the event of future changes in fair value, the Company may be exposed to an impairment charge that could be material. Foreclosed Real Estate Assets acquired through deed in lieu or loan foreclosure are initially recorded at fair value less costs to sell when acquired, establishing a new cost basis. These assets are subsequently accounted for at lower of cost or fair value less estimated costs to sell. If fair value declines subsequent to foreclosure, a valuation allowance is recorded through expense. Operating costs after acquisition are expensed. Premises and Equipment Premises and equipment are stated at cost, net of accumulated depreciation and amortization. Leasehold improvements are capitalized and amortized over the shorter of the terms of the related leases or the estimated economic lives of the improvements. Depreciation and amortization is charged to operations using the straight-line method over the estimated useful lives of the related assets which range from three to thirty nine years. Gains and losses on dispositions are recognized upon realization. Maintenance and repairs are expensed as incurred and improvements are capitalized. Income Taxes Deferred income taxes are recognized for the tax consequences of temporary differences by applying enacted statutory tax rates applicable for future years to differences between financial statement and tax bases of existing assets and liabilities. The effect of tax rate changes on deferred taxes is recognized in the income tax provision in the period that includes the enactment date. A tax valuation allowance is established, as needed, to reduce net deferred tax assets to the amount expected to be realized. In the event it becomes more-likely-than-not that some or all of the deferred tax asset allowances will not be needed, the valuation allowance will be adjusted. In the ordinary course of business there is inherent uncertainty in quantifying the Company’s income tax positions. Income tax positions and recorded tax benefits assessed for all years are subject to examination based upon management’s evaluation of the facts, circumstances, and information available at the reporting date. For those tax positions where it is more-likely-than-not that a tax benefit will be sustained, we have determined the amount of the tax benefit to be recognized by estimating the largest amount of tax benefit that has a greater than 50% likelihood of being realized upon ultimate settlement with a taxing authority that has full knowledge of all relevant information. For those income tax positions where it is not more-likely-than-not that a tax benefit will be sustained, no tax benefit has been recognized in the financial statements. Where applicable, associated interest and penalties have also been recognized. We recognize accrued interest and penalties related to unrecognized tax benefits as a component of income tax expense. Stock Compensation The Company measures and recognizes compensation cost relating to share-based payment transactions based on the grant-date fair value of the equity instruments issued. The fair value of time-based restricted stock is recorded based on the grant date fair value of the Company’s common stock. The fair value of market-based restricted stock is based on values derived using a Monte Carlo based pricing model. The fair value of stock options is determined using the Black-Sholes Option Pricing model. Stock-based compensation costs are recognized over the requisite service period for the awards. Compensation expense reflects the number of awards expected to vest and is adjusted based on awards that ultimately vest. Income tax benefits related to stock compensation in excess of grant date fair value, less any proceeds on exercise, are recognized as an increase to additional paid-in capital upon vesting or exercising and delivery of the stock. Any income tax benefits that are less than grant date fair value less any proceeds on exercise would be recognized as a reduction of additional paid-in capital to the extent of previously recognized income tax benefits and then as compensation expense for the remaining amount. Earnings Per Share Basic earnings per share (“EPS”) is computed by dividing income available to common shareholders by the weighted-average number of shares of common stock outstanding for the period. Diluted EPS reflects the potential dilution that could occur if dilutive stock options and restricted stock awards were exercised and resulted in the issuance of common stock. Unvested share-based payment awards, that include the right to receive non forfeitable dividends, are considered participating securities and therefore considered to be outstanding in the computation of earnings per share. EPS is calculated using the two class method, under which calculations (1) exclude from the numerator any dividends paid or owed on participating securities and any undistributed earnings considered to be attributable to participating securities and (2) exclude from the denominator the dilutive impact of the participating securities. Comprehensive Income Accounting principles generally require that recognized revenues, expenses, gains and losses be included in net income. Although certain changes in assets and liabilities, such as unrealized gains and losses on available for sale securities and cash flow hedge transactions, are reported as a separate component of the stockholders’ equity section of the balance sheets, such items, along with net income, are components of comprehensive income. Fair Values of Financial Instruments The Company is required to disclose the fair value for all financial instruments. The following methods and assumptions were used by management in estimating the fair value of its financial instruments: Cash and due from banks, federal funds sold and accrued interest receivable: Investment securities: Fair Value Measurements. FHLB stock: Loans held for sale: The fair value is based upon prevailing market prices. Loans receivable: Derivative asset (liability): Deposits: Borrowings and Subordinated Debentures: Derivative Instruments The Company enters into interest rate swap agreements as part of the Company’s interest rate risk management strategy. Management applies the hedge accounting provisions of Accounting Standards Codification (“ASC”) Topic 815, and formally documents at inception all relationships between hedging instruments and hedged items, as well as its risk management objectives and strategies for undertaking the various hedges. Additionally, the Company uses dollar offset or regression analysis at the hedge’s inception and for each reporting period thereafter, to assess whether the derivative used in its hedging transaction is expected to be and has been highly effective in offsetting changes in the fair value or cash flows of the hedged item. The Company discontinues hedge accounting when it is determined that a derivative is not expected to be or has ceased to be highly effective as a hedge, and then reflects changes in fair value of the derivative in earnings after termination of the hedge relationship. The Company has characterized all of its interest rate swaps that qualify under Topic 815 hedge accounting as cash flow hedges. Cash flow hedges are used to minimize the variability in cash flows of assets or liabilities, or forecasted transactions caused by interest rate fluctuations, and are recorded at fair value in other assets within the consolidated balance sheet. Changes in the fair value of these cash flow hedges are initially recorded in accumulated other comprehensive income and subsequently reclassified into earnings when the forecasted transaction affects earnings. Any hedge ineffectiveness assessed as part of the Company’s quarterly analysis is recorded directly to earnings. Reclassification Certain prior period amounts have been reclassified to conform to the 2016 financial statement presentation. These reclassifications only changed the reporting categories and did not affect the results of operations or consolidated financial position. Recent accounting pronouncements The following section includes changes in accounting principles and potential effects of new accounting guidance and pronouncements. ASU No. 2014-09 — Revenue from Contracts with Customers (Topic 606). ASU No. 2014-12, Compensation — Stock Compensation (Topic 718): “Accounting for Share-Based Payments When the Terms of an Award Provide That a Performance Target Could Be Achieved after the Requisite Service Period (a consensus of the FASB Emerging Issues Task Force).” ASU No. 2015-03, Interest Imputation of Interest (Subtopic 835-20): “Simplifying the Presentation of Debt Issuance Costs.” The amendments in this ASU require that debt issuance costs related to a recognized debt liability be presented in the balance sheet as a direct deduction from the carrying amount of that debt liability, consistent with debt discounts. The recognition and measurement guidance for debt issuance costs are not affected by the amendments in this ASU. The amendments are effective for annual and interim periods beginning after December 15, 2015, with early adoption permitted. The Company elected to early adopt the provisions of ASU 2015-03 upon issuance of its subordinated debentures on August 19, 2015 and recorded $0.5 million of debt issuance costs incurred as a direct deduction from the debt liability. ASU No. 2016-01, Financial Instruments — Overall (Subtopic 825-10): “Recognition and Measurement of Financial Assets and Financial Liabilities.” ASU 2016-02, Leases (Topic 842). ASU 2016-09, Compensation Stock — Compensation (Topic 718): “Improvements to Employee Share Based Payment Accounting.” ASU No. 2016-13, Financial Instruments — Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments. ASU No. 2016-15, Statement of Cash Flows (Topic 230): “Classification of Certain Cash Receipts and Cash Payments.” ASU No. 2016-18, Statement of Cash Flows (Topic 230): “Restricted Cash”

Shareholders' Equity

Shareholders' Equity	12 Months Ended
	Dec. 31, 2016
Stockholders' Equity Note [Abstract]
Shareholders' Equity	2. Shareholders’ Equity Common stock On May 15, 2014, the Company priced 2,702,703 common shares in its initial public offering (“IPO”) at $18.00 per share, and on May 15, 2014, Bankwell common shares began trading on the Nasdaq Stock Market. The Company issued a total of 2,702,703 common shares in its IPO, which closed on May 20, 2014. The net proceeds from the IPO were approximately $44.7 million, after deducting the underwriting discount of approximately $2.5 million and approximately $1.3 million of expenses. Prior to the public offering, the Company issued shares in various offerings. Warrants Bank of New Canaan’s October 26, 2006 Stock Offering and the July 10, 2007 Private Placement (the “Offerings”) called for the issuance of Units. Each Unit issued pursuant to the Offerings represented one share of common stock and one nontransferable warrant. The warrants were exercisable at any time from and including October 1, 2009 and prior to or on November 30, 2009, unless extended or accelerated by the board of directors in their discretion. The board of directors extended the exercise period to October 5, 2015 through December 5, 2015. Each warrant allowed a holder to purchase .3221 shares of common stock at an exercise price of  $14.00 per share. 945,789 Warrants were available to purchase up to 304,639 shares of common stock at $14.00 per share for a maximum offering of  $4,264,946. As a result of the offering, 838,369 warrants were exercised for 269,992 shares of common stock for total gross proceeds of  $3,779,888. There are no longer any outstanding warrants following the close of this offering. As a result of the acquisition of Quinnipiac on October 1, 2014 the Company issued 68,600 warrants to former Quinnipiac warrant holders in accordance with the merger agreement. Each warrant was automatically converted into a warrant to purchase 0.56 shares of the Company’s common stock for an exercise price of  $17.86. A total of 11,200 warrants have been exercised as of December 31, 2016. The warrants expire on March 6, 2018. Dividends The Company’s shareholders are entitled to dividends when and if declared by the board of directors, out of funds legally available. The ability of the Company to pay dividends depends, in part, on the ability of the Bank to pay dividends to the Company. In accordance with Connecticut statutes, regulatory approval is required to pay dividends in excess of the Bank’s profits retained in the current year plus retained profits from the previous two years. The Bank is also prohibited from paying dividends that would reduce its capital ratios below minimum regulatory requirements. The Company did not repurchase any of its common stock during 2016 or 2015.

Restrictions on cash and due fr

Restrictions on cash and due from banks	12 Months Ended
	Dec. 31, 2016
Restrictions On Cash And Due From Banks [Abstract]
Restrictions on cash and due from banks	3. Restrictions on cash and due from banks The Bank is required to maintain $125 thousand in the Federal Reserve Bank for clearing purposes.

Goodwill and other intangible a

Goodwill and other intangible assets	12 Months Ended
	Dec. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Other Intangible Assets	4. Goodwill and other intangible assets Information on goodwill for the year ended December 31, 2016 and 2015 is as follows: Year Ended Year Ended (In thousands) Balance, beginning of the period $ 2,589 $ 2,589 Impairment — — Balance, end of the period $ 2,589 $ 2,589 The Company tests for goodwill impairment annually as of June 30 th The table below provides information regarding the carrying amounts and accumulated amortization of amortized intangible assets as of the dates set forth below. Gross Intangible Accumulated Net Intangible (In thousands) December 31, 2016 Core deposit intangible $ 1,029 $ 528 $ 501 December 31, 2015 Core deposit intangible $ 1,029 $ 377 $ 652

Investment Securities

Investment Securities	12 Months Ended
	Dec. 31, 2016
Investments, Debt and Equity Securities [Abstract]
Investment Securities	5. Investment Securities The amortized cost, gross unrealized gains and losses and fair values of available for sale and held to maturity securities segregated by contractual maturity at December 31, 2016 were as follows: December 31, 2016 Amortized Gross Unrealized Fair Gains Losses (In thousands) Available for sale securities: U.S. Government and agency obligations Due from one through five years $ 62,357 $ 295 $ (49 ) $ 62,603 Due after ten years 100 — (5 ) 95 62,457 295 (54 ) 62,698 State agency and municipal obligations Due from one through five years 827 24 (3 ) 848 Due from five through ten years 8,045 189 (1 ) 8,233 Due after ten years 5,623 178 (119 ) 5,682 14,495 391 (123 ) 14,763 Corporate bonds Due in less than one year 2,022 56 — 2,078 Due from one through five years 8,145 67 — 8,212 10,167 123 — 10,290 Total available for sale securities $ 87,119 $ 809 $ (177 ) $ 87,751 Held to maturity securities: State agency, U.S. Territories and municipal obligations Due from one through five years $ 2,135 $ — $ — $ 2,135 Due after ten years 13,575 — — 13,575 15,710 — — 15,710 Corporate bonds Due from one through five years 1,000 — (23 ) 977 Government-sponsored mortgage backed securities No contractual maturity 149 15 — 164 Total held to maturity securities $ 16,859 $ 15 $ (23 ) $ 16,851 The amortized cost, gross unrealized gains and losses and fair values of available for sale and held to maturity securities segregated by contractual maturity at December 31, 2015 were as follows: December 31, 2015 Amortized Gross Unrealized Fair Gains Losses (In thousands) Available for sale securities: U.S. Government and agency obligations Due in less than one year $ 6,198 $ — $ (77 ) $ 6,121 Due from one through five years 394 4 (2 ) 396 Due from five through ten years 647 — (21 ) 626 Due after ten years 7,239 4 (100 ) 7,143 State agency, U.S. Territories and municipal obligations 520 39 — 559 Due from five through ten years 9,762 361 (322 ) 9,801 Due after ten years 6,778 367 (1 ) 7,144 17,060 767 (323 ) 17,504 Corporate bonds Due in less than one year 1,010 22 — 1,032 Due from one through five years 9,233 156 (9 ) 9,380 Due from five through ten years 1,013 12 — 1,025 11,256 190 (9 ) 11,437 Government-sponsored mortgage backed securities No contractual maturity 4,400 107 (10 ) 4,497 Total available for sale securities $ 39,955 $ 1,068 $ (442 ) $ 40,581 Held to maturity securities: U.S. Government and agency obligations Due in less than one year $ — $ — $ — $ — State agency, U.S. Territories and municipal obligations Due after ten years 9,026 — — 9,026 Corporate bonds Due from five through ten years 1,000 — (19 ) 981 Government-sponsored mortgage backed securities No contractual maturity 200 21 — 221 Total held to maturity securities $ 10,226 $ 21 $ (19 ) $ 10,228 For the year ended December 31, 2016, the Company realized a net loss of  $115 thousand from the sales of investment securities, primarily driven by the sale of a Commonwealth of Puerto Rico senior lien sales tax financing corporate bond or “COFINA” bond on November 2, 2016. Gross gains from the sales of investment securities totaled $129.4 thousand and gross losses from the sales of investment securities totaled $244.6 thousand. There were no sales of, or realized gains or losses on, investment securities for the years ended December 31, 2015 and 2014. At December 31, 2016 and 2015, securities with approximate fair values of  $60.0 million and $5.9 million were pledged as collateral with the FHLB. The collateral is pledged for general purposes and for public deposits. The following table provides information regarding investment securities with unrealized losses, aggregated by investment category and length of time that individual securities had been in a continuous unrealized loss position at December 31, 2016 and 2015: Length of Time in Continuous Unrealized Loss Position Less Than 12 Months 12 Months or More Total Fair Unrealized Fair Unrealized Fair Unrealized (In thousands) December 31, 2016 U.S. Government and agency obligations $ 3,045 $ (54 ) $ — $ — $ 3,045 $ (54 ) State agency and municipal obligations 2,756 (123 ) — — 2,756 (123 ) Corporate bonds 978 (23 ) — — 978 (23 ) Total investment securities $ 6,779 $ (200 ) $ — $ — $ 6,779 $ (200 ) December 31, 2015 U.S. Government and agency obligations $ 5,486 $ (60 ) $ 1,259 $ (40 ) $ 6,745 $ (100 ) State agency, U.S. Territories and municipal 126 (1 ) 665 (322 ) 791 (323 ) Corporate bonds 1,970 (28 ) — — 1,970 (28 ) Government-sponsored mortgage backed securities 768 (4 ) 413 (6 ) 1,181 (10 ) Total investment securities $ 8,350 $ (93 ) $ 2,337 $ (368 ) $ 10,687 $ (461 ) There were 11 and 29 individual investment securities, respectively, in which the fair value of the security was less than the amortized cost of the security at December 31, 2016 and December 31, 2015. The U.S. Government and agency obligations owned are either direct obligations of the U.S. Government or are issued by one of the shareholder-owned corporations chartered by the U.S. Government, therefore the contractual cash flows are guaranteed and as a result the unrealized losses in this portfolio are not considered other than temporarily impaired. The Company continually monitors its state agency, U.S. Territories, municipal and corporate bond portfolios and at this time these portfolios have minimal default risk because state agency, U.S. Territories, municipal and corporate bonds are all rated above investment grade.

Loans Receivable and Allowance

Loans Receivable and Allowance for Loan Losses	12 Months Ended
	Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable, Gross, Allowance, and Net [Abstract]
Loans Receivable and Allowance for Loan Losses	6. Loans Receivable and Allowance for Loan Losses Loans acquired in connection with The Wilton acquisition in November 2013 and The Quinnipiac acquisition in October 2014 are referred to as “acquired” loans as a result of the manner in which they are accounted for. All other loans are referred to as “originated” loans. Accordingly, selected credit quality disclosures that follow are presented separately for the originated loan portfolio and the acquired loan portfolio. The following table sets forth a summary of the loan portfolio at December 31, 2016 and 2015: December 31, 2016 December 31, 2015 Originated Acquired Total Originated Acquired Total (In thousands) Real estate loans: Residential $ 178,549 $ 2,761 $ 181,310 $ 174,311 $ 2,873 $ 177,184 Commercial 802,156 43,166 845,322 643,524 54,018 697,542 Construction 107,329 112 107,441 81,242 1,031 82,273 Home equity 8,549 5,870 14,419 9,146 6,780 15,926 1,096,583 51,909 1,148,492 908,223 64,702 972,925 Commercial business 198,456 17,458 215,914 150,479 22,374 172,853 Consumer 672 861 1,533 117 1,618 1,735 Total loans 1,295,711 70,228 1,365,939 1,058,819 88,694 1,147,513 Allowance for loan losses (17,883 ) (99 ) (17,982 ) (14,128 ) (41 ) (14,169 ) Deferred loan origination fees, net (4,071 ) — (4,071 ) (3,605 ) — (3,605 ) Unamortized loan premiums 9 — 9 9 — 9 Loans receivable, net $ 1,273,766 $ 70,129 $ 1,343,895 $ 1,041,095 $ 88,653 $ 1,129,748 Lending activities are conducted principally in the New York metropolitan area, including the Fairfield and New Haven County regions of Connecticut, and consist of residential and commercial real estate loans, commercial business loans and a variety of consumer loans. Loans may also be granted for the construction of residential homes and commercial properties. All residential and commercial mortgage loans are collateralized by first or second mortgages on real estate. The following table summarizes activity in the accretable yields for the acquired loan portfolio for the years ended December 31, 2016 and 2015: 2016 2015 (In thousands) Balance at beginning of period $ 871 $ 1,382 Acquisition — — Accretion (154 ) (157 ) Other (a) (51 ) (354 ) Balance at end of period $ 666 $ 871 (a) Represents changes in cash flows expected to be collected due to loan sales or payoffs. Risk management The Company has established credit policies applicable to each type of lending activity in which it engages. The Company evaluates the creditworthiness of each customer and extends credit of up to 80% of the market value of the collateral, depending on the borrowers’ creditworthiness and the type of collateral. The borrower’s ability to service the debt is monitored on an ongoing basis. Real estate is the primary form of collateral. Other important forms of collateral are business assets, time deposits and marketable securities. While collateral provides assurance as a secondary source of repayment, the Company ordinarily requires the primary source of repayment to be based on the borrower’s ability to generate continuing cash flows. The Company’s policy for residential lending allows that, generally, the amount of the loan may not exceed 80% of the original appraised value of the property. In certain situations, the amount may exceed 80% LTV either with private mortgage insurance being required for that portion of the residential loan in excess of 80% of the appraised value of the property or where secondary financing is provided by a housing authority program second mortgage, a community’s low/moderate income housing program, a religious or civic organization. Private mortgage insurance may be required for that portion of the residential first mortgage loan in excess of 80% of the appraised value of the property. Credit quality of loans and the allowance for loan losses Management segregates the loan portfolio into portfolio segments which is defined as the level at which the Company develops and documents a systematic method for determining its allowance for loan losses. The portfolio segments are segregated based on loan types and the underlying risk factors present in each loan type. Such risk factors are periodically reviewed by management and revised as deemed appropriate. The Company’s loan portfolio is segregated into the following portfolio segments: Residential Real Estate: Commercial Real Estate: Construction: Home Equity: Commercial Business: Consumer: Allowance for loan losses The following tables set forth the activity in the Company’s allowance for loan losses for the years ended December 31, 2016, 2015 and 2014, by portfolio segment: Residential Commercial Construction Home Equity Commercial Consumer Total (In thousands) December 31, 2016 Originated Beginning balance $ 1,444 $ 7,693 $ 1,504 $ 174 $ 3,310 $ 3 $ 14,128 Charge-offs — — — — (59 ) (10 ) (69 ) Recoveries — — — — — 8 8 Provisions 202 1,693 601 (18 ) 989 349 3,816 Ending balance $ 1,646 $ 9,386 $ 2,105 $ 156 $ 4,240 $ 350 $ 17,883 Acquired Beginning balance $ — $ 12 $ — $ — $ 24 $ 5 $ 41 Charge-offs — — (7 ) — (10 ) (25 ) (42 ) Recoveries — — — — — 2 2 Provisions — 17 7 — 29 45 98 Ending balance $ — $ 29 $ — $ — $ 43 $ 27 $ 99 Total Beginning balance $ 1,444 $ 7,705 $ 1,504 $ 174 $ 3,334 $ 8 $ 14,169 Charge-offs — — (7 ) — (69 ) (35 ) (111 ) Recoveries — — — — — 10 10 Provisions 202 1,710 608 (18 ) 1,018 394 3,914 Ending balance $ 1,646 $ 9,415 $ 2,105 $ 156 $ 4,283 $ 377 $ 17,982 Residential Commercial Construction Home Equity Commercial Consumer Total (In thousands) December 31, 2015 Originated Beginning balance $ 1,431 $ 5,480 $ 1,102 $ 205 $ 2,638 $ 4 $ 10,860 Charge-offs — — — — — (6 ) (6 ) Recoveries — — — — — 7 7 Provisions 13 2,213 402 (31 ) 672 (2 ) 3,267 Ending balance $ 1,444 $ 7,693 $ 1,504 $ 174 $ 3,310 $ 3 $ 14,128 Acquired Beginning balance $ — $ — $ — $ — $ — $ — $ — Charge-offs — — — — (15 ) (9 ) (24 ) Recoveries — — — — 100 2 102 Provisions — 12 — — (61 ) 12 (37 ) Ending balance $ — $ 12 $ — $ — $ 24 $ 5 $ 41 Total Beginning balance $ 1,431 $ 5,480 $ 1,102 $ 205 $ 2,638 $ 4 $ 10,860 Charge-offs — — — — (15 ) (15 ) (30 ) Recoveries — — — — 100 9 109 Provisions 13 2,225 402 (31 ) 611 10 3,230 Ending balance $ 1,444 $ 7,705 $ 1,504 $ 174 $ 3,334 $ 8 $ 14,169 Residential Commercial Construction Home Equity Commercial Consumer Total (In thousands) December 31, 2014 Originated Beginning balance $ 1,310 $ 3,616 $ 1,032 $ 190 $ 2,225 $ 9 $ 8,382 Charge-offs — — — — — (3 ) (3 ) Recoveries — — — — 4 425 429 Provisions 121 1,864 70 15 409 (427 ) 2,052 Ending balance $ 1,431 $ 5,480 $ 1,102 $ 205 $ 2,638 $ 4 $ 10,860 Acquired Beginning balance $ — $ — $ — $ — $ — $ — $ — Charge-offs — — (100 ) — — — (100 ) Recoveries — — — — — — — Provisions — — 100 — — — 100 Ending balance $ — $ — $ — $ — $ — $ — $ — Total Beginning balance $ 1,310 $ 3,616 $ 1,032 $ 190 $ 2,225 $ 9 $ 8,382 Charge-offs — — (100 ) — — (3 ) (103 ) Recoveries — — — — 4 425 429 Provisions 121 1,864 170 15 409 (427 ) 2,152 Ending balance $ 1,431 $ 5,480 $ 1,102 $ 205 $ 2,638 $ 4 $ 10,860 Loans evaluated for impairment and the related allowance for loan losses as of December 31, 2016 and 2015 were as follows: Originated Loans Acquired Loans Total Portfolio Allowance Portfolio Allowance Portfolio Allowance (In thousands) December 31, 2016 Loans individually evaluated for impairment: Residential real estate $ 969 $ — $ — $ — $ 969 $ — Commercial real estate 774 1 144 7 918 8 Home equity 259 — 453 — 712 — Commercial business 920 5 962 37 1,882 42 Consumer 341 341 27 27 368 368 Subtotal 3,263 347 1,586 71 4,849 418 Loans collectively evaluated for impairment: Residential real estate 177,580 1,646 2,761 — 180,341 1,646 Commercial real estate 801,382 9,385 43,022 22 844,404 9,407 Construction 107,329 2,105 112 — 107,441 2,105 Home equity 8,290 156 5,417 — 13,707 156 Commercial business 197,536 4,235 16,496 6 214,032 4,241 Consumer 331 9 834 — 1,165 9 Subtotal 1,292,448 17,536 68,642 28 1,361,090 17,564 Total $ 1,295,711 $ 17,883 $ 70,228 $ 99 $ 1,365,939 $ 17,982 Originated Loans Acquired Loans Total Portfolio Allowance Portfolio Allowance Portfolio Allowance (In thousands) December 31, 2015 Loans individually evaluated for impairment: Residential real estate $ 1,833 $ 2 $ — $ — $ 1,833 $ 2 Commercial real estate 4,291 — 762 12 5,053 12 Home equity 422 — 197 — 619 — Commercial business 1,977 71 1,433 21 3,410 92 Consumer — — 7 5 7 5 Subtotal 8,523 73 2,399 38 10,922 111 Loans collectively evaluated for impairment: Residential real estate 172,478 1,442 2,873 — 175,351 1,442 Commercial real estate 639,233 7,692 53,256 — 692,489 7,692 Construction 81,242 1,504 1,031 — 82,273 1,504 Home equity 8,724 174 6,583 — 15,307 174 Commercial business 148,502 3,239 20,941 3 169,443 3,242 Consumer 117 4 1,611 — 1,728 4 Subtotal 1,050,296 14,055 86,295 3 1,136,591 14,058 Total $ 1,058,819 $ 14,128 $ 88,694 $ 41 $ 1,147,513 $ 14,169 Credit quality indicators The Company’s policies provide for the classification of loans into the following categories: pass, special mention, substandard, doubtful and loss. Consistent with regulatory guidelines, loans that are considered to be of lesser quality are classified as substandard, doubtful, or loss assets. A loan is considered substandard if it is inadequately protected by the current net worth and paying capacity of the obligor or of the collateral pledged, if any. Substandard loans include those loans characterized by the distinct possibility that the Company will sustain some loss if the deficiencies are not corrected. Loans classified as doubtful have all of the weaknesses inherent in those classified substandard with the added characteristic that the weaknesses present make collection or liquidation in full, on the basis of currently existing facts, conditions and values, highly questionable and improbable. Loans classified as loss are those considered uncollectible and of such little value that their continuance as loans is not warranted. Loans that do not expose the Company to risk sufficient to warrant classification in one of the aforementioned categories, but which possess potential weaknesses that deserve close attention, are designated as special mention. Loans that are considered to be impaired are analyzed to determine whether a loss is probable and if so, a calculation is performed to determine the possible loss amount. If it is determined that the loss amount is $0, no reserve is held against the asset. If a loss is calculated, then a specific reserve for that asset is determined. The following tables are a summary of the loan portfolio quality indicators by portfolio segment at December 31, 2016 and 2015: Commercial Credit Quality Indicators At December 31, 2016 At December 31, 2015 Commercial Construction Commercial Total Commercial Construction Commercial Total (In thousands) Originated loans: Pass $ 797,249 $ 107,329 $ 196,436 $ 1,101,014 $ 638,709 $ 81,242 $ 148,748 $ 868,699 Special mention 4,605 — 115 4,720 1,595 — 1,118 2,713 Substandard 302 — 1,905 2,207 3,220 — 549 3,769 Doubtful — — — — — — — — Loss — — — — — — 64 64 Total originated loans 802,156 107,329 198,456 1,107,941 643,524 81,242 150,479 875,245 Acquired loans: Pass 41,582 112 16,836 58,530 52,427 230 20,794 73,451 Special mention 1,584 — 86 1,670 — — 598 598 Substandard — — 536 536 1,591 801 982 3,374 Doubtful — — — — — — — — Loss — — — — — — — — Total acquired loans 43,166 112 17,458 60,736 54,018 1,031 22,374 77,423 Total loans: Pass 838,831 107,441 213,272 1,159,544 691,136 81,472 169,542 942,150 Special mention 6,189 — 201 6,390 1,595 — 1,716 3,311 Substandard 302 — 2,441 2,743 4,811 801 1,531 7,143 Doubtful — — — — — — — — Loss — — — — — — 64 64 Total loans $ 845,322 $ 107,441 $ 215,914 $ 1,168,677 $ 697,542 $ 82,273 $ 172,853 $ 952,668 Residential and Consumer Credit Quality Indicators At December 31, 2016 At December 31, 2015 Residential Home Equity Consumer Total Residential Home Equity Consumer Total (In thousands) Originated loans: Pass $ 176,961 $ 8,291 $ 331 $ 185,583 $ 172,478 $ 8,725 $ 117 $ 181,320 Special mention 147 69 — 216 864 80 — 944 Substandard 1,441 189 — 1,630 969 341 — 1,310 Doubtful — — — — — — — — Loss — — 341 341 — — — — Total originated loans 178,549 8,549 672 187,770 174,311 9,146 117 183,574 Acquired loans: Pass 2,229 5,417 835 8,481 2,873 6,545 1,539 10,957 Special mention 49 — — 49 — — — — Substandard 483 453 2 938 — 235 79 314 Doubtful — — — — — — — — Loss — — 24 24 — — — — Total acquired loans 2,761 5,870 861 9,492 2,873 6,780 1,618 11,271 Total loans: Pass 179,190 13,708 1,166 194,064 175,351 15,270 1,656 192,277 Special mention 196 69 — 265 864 80 — 944 Substandard 1,924 642 2 2,568 969 576 79 1,624 Doubtful — — — — — — — — Loss — — 365 365 — — — — Total loans $ 181,310 $ 14,419 $ 1,533 $ 197,262 $ 177,184 $ 15,926 $ 1,735 $ 194,845 Loan portfolio aging analysis The following tables set forth certain information with respect to our loan portfolio delinquencies by portfolio segment and amount as of December 31, 2016 and December 31, 2015: As of December 31, 2016 31 – 60 Days 61 – 90 Days Greater Than Total Past Current Total Loans (In thousands) Originated Loans Real estate loans: Residential real estate $ — $ — $ 969 $ 969 $ 177,580 $ 178,549 Commercial real estate 147 1,848 302 2,297 799,859 802,156 Construction — — — — 107,329 107,329 Home equity — 173 — 173 8,376 8,549 Commercial business — — 378 378 198,078 198,456 Consumer — — — — 672 672 Total originated loans 147 2,021 1,649 3,817 1,291,894 1,295,711 Acquired Loans Real estate loans: Residential real estate — — — — 2,761 2,761 Commercial real estate 866 722 143 1,731 41,435 43,166 Construction — — — — 112 112 Home equity — — 453 453 5,417 5,870 Commercial business 99 249 — 348 17,110 17,458 Consumer 6 — — 6 855 861 Total acquired loans 971 971 596 2,538 67,690 70,228 Total loans $ 1,118 $ 2,992 $ 2,245 $ 6,355 $ 1,359,584 $ 1,365,939 As of December 31, 2015 31 – 60 Days 61 – 90 Days Greater Than Total Past Current Total Loans (In thousands) Originated Loans Real estate loans: Residential real estate $ — $ — $ 969 $ 969 $ 173,342 $ 174,311 Commercial real estate — 311 — 311 643,213 643,524 Construction — — — — 81,242 81,242 Home equity 198 — — 198 8,948 9,146 Commercial business 1,078 100 343 1,521 148,958 150,479 Consumer — — — — 117 117 Total originated loans 1,276 411 1,312 2,999 1,055,820 1,058,819 Acquired Loans Real estate loans: Residential real estate — — — — 2,873 2,873 Commercial real estate 333 — 762 1,095 52,923 54,018 Construction — — 801 801 230 1,031 Home equity 100 162 191 453 6,327 6,780 Commercial business 262 71 101 434 21,940 22,374 Consumer 17 — — 17 1,601 1,618 Total acquired loans 712 233 1,855 2,800 85,894 88,694 Total loans $ 1,988 $ 644 $ 3,167 $ 5,799 $ 1,141,714 $ 1,147,513 There were no loans delinquent greater than 90 days and still accruing as of December 31, 2016 and there were $1.1 million of loans delinquent greater than 90 days and still accruing as of December 31, 2015. Loans on nonaccrual status The following is a summary of nonaccrual loans by portfolio segment as of December 31, 2016 and 2015: December 31, 2016 2015 (In thousands) Residential real estate $ 969 $ 970 Commercial real estate 446 1,264 Home equity 643 395 Commercial business 538 1,160 Consumer 341 2 Total $ 2,937 $ 3,791 The amount of income that was contractually due but not recognized on originated nonaccrual loans totaled $17 thousand, $25 thousand and $8 thousand for the years ended December 31, 2016, 2015 and 2014, respectively. The amount of actual interest income recognized on these loans was $74 thousand, $43 thousand and $190 thousand for the years ended December 31, 2016, 2015 and 2014, respectively. At December 31, 2016 and 2015, there were $0 and $169 thousand in commitments to lend additional funds to borrowers on nonaccrual status, respectively. Impaired loans An impaired loan generally is one for which it is probable, based on current information, the Company will not collect all the amounts due under the contractual terms of the loan. Loans are individually evaluated for impairment. When the Company classifies a problem loan as impaired, it provides a specific valuation allowance for that portion of the asset that is deemed uncollectible. The following table summarizes impaired loans by portfolio segment and the average carrying amount and interest income recognized on impaired loans by portfolio segment as of December 31, 2016, 2015 and 2014: As of and for the Year Ended December 31, 2016 Carrying Unpaid Associated Average Interest (In thousands) Originated Impaired loans without a valuation allowance: Residential real estate $ 969 $ 969 $ — $ 969 $ — Commercial real estate 651 651 — 668 29 Home equity 259 269 — 267 10 Commercial business 551 584 — 987 76 Total impaired loans without a valuation allowance $ 2,430 $ 2,473 $ — $ 2,891 $ 115 Impaired loans with a valuation allowance: Residential real estate $ — $ — $ — $ — $ — Commercial real estate 123 123 1 128 6 Commercial business 369 369 5 417 22 Consumer 341 341 341 341 — Total impaired loans with a valuation allowance 833 833 347 886 28 Total originated impaired loans $ 3,263 $ 3,306 $ 347 $ 3,777 $ 143 Acquired Impaired loans without a valuation allowance: Home Equity $ 453 $ 462 $ — $ 456 $ 9 Commercial Business 572 593 — 629 36 Total impaired loans without a valuation allowance $ 1,025 $ 1,055 $ — $ 1,085 $ 45 Impaired loans with a valuation allowance: Commercial real estate $ 144 $ 144 $ 7 $ 144 $ — Commercial business 390 390 37 406 19 Consumer 27 27 27 27 — Total impaired loans with a valuation allowance 561 561 71 577 19 Total acquired impaired loans $ 1,586 $ 1,616 $ 71 $ 1,662 $ 64 As of and for the Year Ended December 31, 2015 Carrying Unpaid Associated Average Interest (In thousands) Originated Impaired loans without a valuation allowance: Residential real estate $ 969 $ 969 $ — $ 973 $ 27 Commercial real estate 4,291 4,291 — 4,308 124 Home equity 422 424 — 429 10 Commercial business 1,351 1,372 — 1,374 49 Total impaired loans without a valuation allowance $ 7,033 $ 7,056 $ — $ 7,084 $ 210 Impaired loans with a valuation allowance: Residential real estate $ 864 $ 864 $ 2 $ 864 $ 28 Commercial business 626 690 71 673 34 Total impaired loans with a valuation allowance 1,490 1,554 73 1,537 62 Total originated impaired loans $ 8,523 $ 8,610 $ 73 $ 8,621 $ 272 Acquired Impaired loans without a valuation allowance: Commercial real estate $ 611 $ 678 $ — $ 602 $ 6 Home Equity 197 200 — 198 2 Commercial Business 963 963 — 999 54 Total impaired loans without a valuation allowance $ 1,771 $ 1,841 $ — $ 1,799 $ 62 Impaired loans with a valuation allowance: Commercial real estate $ 151 $ 151 $ 12 $ 151 $ 3 Commercial business 470 480 21 506 14 Consumer 7 7 5 7 1 Total impaired loans with a valuation allowance 628 638 38 664 18 Total acquired impaired loans $ 2,399 $ 2,479 $ 38 $ 2,463 $ 80 As of and for the Year Ended December 31, 2014 Carrying Unpaid Associated Average Interest (In thousands) Originated Impaired loans without a valuation allowance: Residential real estate $ 864 $ 864 $ — $ 864 $ 28 Commercial real estate 4,543 4,544 — 4,034 223 Home equity 91 91 — 95 3 Commercial business 1,145 1,153 — 1,226 52 Total impaired loans without a valuation allowance $ 6,643 $ 6,652 $ — $ 6,219 $ 306 Impaired loans with a valuation allowance: Commercial real estate $ 453 $ 453 $ 23 $ 457 $ 29 Commercial business 556 556 10 596 32 Total impaired loans with a valuation allowance $ 1,009 $ 1,009 $ 33 $ 1,053 $ 61 Total originated impaired loans $ 7,652 $ 7,661 $ 33 $ 7,272 $ 367 Acquired Impaired loans without a valuation allowance: Commercial business $ 629 $ 629 $ — $ 607 $ 28 Total impaired loans without a valuation allowance $ 629 $ 629 $ — $ 607 $ 28 Impaired loans with a valuation allowance: Total impaired loans with a valuation allowance $ — $ — $ — $ — $ — Total acquired impaired loans $ 629 $ 629 $ — $ 607 $ 28 Troubled debt restructurings (TDRs) Modifications to a loan are considered to be a troubled debt restructuring when one or both of the following conditions is met: 1) the borrower is experiencing financial difficulties and/or 2) the modification constitutes a concession that is not in line with market rates and/or terms. Modified terms are dependent upon the financial position and needs of the individual borrower. Troubled debt restructurings are classified as impaired loans. If a performing loan is restructured into a TDR it remains in performing status. If a nonperforming loan is restructured into a TDR, it continues to be carried in nonaccrual status. Nonaccrual classification may be removed if the borrower demonstrates compliance with the modified terms for a minimum of six months. Troubled debt restructured loans are reported as such for at least one year from the date of restructuring. In years after the restructuring, troubled debt restructured loans are removed from this classification if the restructuring agreement specifies a market rate of interest equal to that which would be provided to a borrower with similar credit at the time of restructuring and the loan is not deemed to be impaired based on the modified terms. The recorded investment in TDRs was $1.4 million at December 31, 2016 and $7.3 million at December 31, 2015. The following table presents loans whose terms were modified as TDRs during the periods presented: Outstanding Recorded Investment Number of Loans Pre-Modification Post-Modification 2016 2015 2014 2016 2015 2014 2016 2015 2014 (Dollars in thousands) Years ended December 31, Commercial real estate 1 3 2 $ 62 $ 4,044 $ 1,317 $ 62 $ 4,044 $ 1,317 Commercial business 2 1 4 237 39 782 237 39 782 Total 3 4 6 $ 299 $ 4,083 $ 2,099 $ 299 $ 4,083 $ 2,099 All TDRs at December 31, 2016 and December 31, 2015 were performing in compliance with their modified terms, except for one non-accrual loans totaling $66 thousand at December 31, 2016 and two non-accrual loans totaling $1.1 million at December 31, 2015. The following table provides information on how loans were modified as a TDR for the years ended December 31, 2016 and 2015. December 31, 2016 2015 2014 (In thousands) Maturity Concession $ 299 $ — $ — Maturity/amortization concession — 825 946 Maturity and payment concession — 3,258 — Payment concession — — 1,153 Total $ 299 $ 4,083 $ 2,099 There was no loans modified in a troubled debt restructuring, for which there was a payment default during the years ended December 31, 2016, 2015 and 2014, respectively.

Premises and equipment

Premises and equipment	12 Months Ended
	Dec. 31, 2016
Property, Plant and Equipment [Abstract]
Premises and equipment	7. Premises and equipment At December 31, 2016 and 2015, premises and equipment consisted of the following: December 31, 2016 2015 (In thousands) Land $ 2,300 $ 2,300 Building 14,061 6,384 Leasehold improvements 4,532 4,544 Furniture and fixtures 2,118 1,964 Equipment 4,249 3,734 Automobiles 67 — 27,327 18,926 Accumulated depreciation and amortization (9,492 ) (7,763 ) Premises and equipment, net $ 17,835 $ 11,163 For the years ended December 31, 2016, 2015 and 2014, depreciation and amortization expense related to premises and equipment totaled $1.7 million, $1.7 million and $1.2 million, respectively.

Deposits

Deposits	12 Months Ended
	Dec. 31, 2016
Deposits [Abstract]
Deposits	8. Deposits At December 31, 2016 and 2015, deposits consisted of the following: December 31, 2016 2015 (In thousands) Noninterest bearing demand deposit accounts $ 187,593 $ 164,553 Interest bearing accounts: NOW and money market 402,982 347,846 Savings 96,601 97,846 Time certificates of deposit 601,861 436,697 Total interest bearing accounts 1,101,444 882,389 Total deposits $ 1,289,037 $ 1,046,942 Maturities of time certificates of deposit as of December 31, 2016 and 2015 are summarized below: December 31, 2016 2015 (In thousands) 2016 $ — $ 238,673 2017 323,742 152,682 2018 247,517 35,186 2019 29,778 9,810 2020 433 346 2021 391 — $ 601,861 $ 436,697 The aggregate amount of individual certificate accounts, excluding brokered deposits with balances of $250,000 or more were approximately $148.5 million and $98.2 million at December 31, 2016 and 2015, respectively. Brokered deposits totaled $58.2 million and $55.6 million at December 31, 2016 and 2015, respectively. Brokered deposits also include customer money reciprocal deposits for customers that desire FDIC protection and one way CDARS. Brokered deposits are utilized as an additional source of funding. The following table summarizes interest expense by account type for the years ended December 31, 2016, 2015 and 2014: Years Ended December 31, 2016 2015 2014 (In thousands) NOW and money market $ 1,945 $ 1,473 $ 894 Savings 315 693 302 Time certificates of deposit 6,040 3,515 2,099 Total interest expense on deposits $ 8,300 $ 5,681 $ 3,295

Federal Loan Bank Advances and

Federal Loan Bank Advances and Other Borrowings	12 Months Ended
	Dec. 31, 2016
Advances from Federal Home Loan Banks [Abstract]
Federal Loan Bank Advances and Other Borrowings	9. Federal Home Loan Bank Advances and Other Borrowings The following is a summary of FHLB advances with maturity dates and weighted average rates at December 31, 2016 and 2015: December 31, 2016 2015 Amount Weighted Amount Weighted (Dollars in thousands) Year of Maturity: 2016 $ — — % $ 75,000 0.46 % 2017 135,000 0.73 20,000 0.99 2020 25,000 1.99 25,000 1.99 Total advances $ 160,000 0.92 % $ 120,000 0.87 % $100.0 million of the above mentioned FHLB advances as of December 31, 2016 are subject to interest rate swap transactions, see note 17. The Bank has additional borrowing capacity at the FHLB up to a certain percentage of the value of qualified collateral. In accordance with agreements with the FHLB, the qualified collateral must be free and clear of liens, pledges and encumbrances. As of December 31, 2016 the Company has immediate availability to borrow an additional $331.4 million based on qualified collateral. Additionally, the Bank has access to a pre-approved secured line of credit of  $450 thousand with the FHLB, none of which was outstanding at December 31, 2016 and 2015. The Bank has an unsecured line of credit with Bankers’ Bank Northeast of  $7.5 million at December 31, 2016 and 2015, none of which was outstanding at December 31, 2016 and 2015. Federal Home Loan Bank Stock As a member of the FHLB, the Bank is required to maintain investments in their capital stock. The Bank owned 79,430 and 65,536 shares at December 31, 2016 and 2015, respectively. There is no ready market or quoted market values for the stock. The shares have a par value of  $100 and are carried on the consolidated balance sheets at cost, as the stock is only redeemable at par subject to the redemption practices of the FHLB.

Subordinated Debentures

Subordinated Debentures	12 Months Ended
	Dec. 31, 2016
Subordinated Borrowings [Abstract]
Subordinated Debentures	10. Subordinated Debentures On August 19, 2015 the Company completed a private placement of  $25.5 million in aggregate principal amount of fixed rate subordinated notes (the “Notes”) to certain institutional investors. The Notes are non-callable for five years, have a stated maturity of August 15, 2025, and bear interest at a quarterly pay fixed rate of 5.75% per annum to the maturity date or the early redemption date. The Notes have been structured to qualify for the Company as Tier 2 capital under regulatory guidelines. The Company will use the net proceeds from the sales of the Notes for general corporate purposes as well as providing equity capital to the Bank. The Notes were assigned an investment grade rating of BBB by Kroll Bond Rating Agency, which was reaffirmed in the third quarter of 2016.

Commitments and Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2016
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	11. Commitments and Contingencies Leases The Company leases all but three locations, plus certain equipment under operating lease agreements, which expire at various dates through 2029. In addition to rental payments, the leases require payment of property taxes and certain common area maintenance fees. Total future lease obligations totaled $19.2 million and $8.2 million at December 31, 2016 and 2015, respectively. The lease obligations at December 31, 2016 include a land lease with a municipality related to a building purchased in December, 2016. The land lease has a 98 year and 11 month term which commenced on September 1, 2001. The current lease payment is approximately $120 thousand per year and may be adjusted to fair market value in subsequent years. Total rental expense approximated $2.0 million, $1.8 million and $1.6 million for the years ended December 31, 2016, 2015 and 2014, respectively. Legal matters The Company is involved in various legal proceedings which have arisen in the normal course of business. Management believes that resolution of these matters will not have a material effect on the Company’s financial condition or results of operations. Off-balance sheet instruments In the normal course of business, the Company is a party to financial instruments with off-balance sheet risk to meet the financing needs of its customers. These financial instruments include commitments to extend credit and involve, to varying degrees, elements of credit and interest rate risk in excess of the amounts recognized in the financial statements. The contractual amounts of these instruments reflect the extent of involvement the Company has in particular classes of financial instruments. The contractual amounts of commitments to extend credit represents the amounts of potential accounting loss should the contract be fully drawn upon, the customer’s default, and the value of any existing collateral becomes worthless. Management uses the same credit policies in making commitments and conditional obligations as it does for on-balance sheet instruments and evaluates each customer’s creditworthiness on a case-by-case basis. Management believes that they control the credit risk of these financial instruments through credit approvals, credit limits, monitoring procedures and the receipt of collateral as deemed necessary. Financial instruments whose contract amounts represented credit risk at December 31, 2016 and 2015 were as follows: December 31, 2016 2015 (In thousands) Commitments to extend credit: Loan commitments $ 89,825 $ 77,181 Undisbursed construction loans 70,526 66,974 Unused home equity lines of credit 8,083 9,258 $ 168,434 $ 153,413 Commitments to extend credit are agreements to lend to a customer as long as there is no violation of any condition established in the contract. Commitments to extend credit generally have fixed expiration dates or other termination clauses and may require payment of a fee by the borrower. Since these commitments could expire without being drawn upon, the total commitment amounts do not necessarily represent future cash requirements. The amount of collateral obtained, if deemed necessary by the Company upon extension of credit, is based on management’s credit evaluation of the counter party. Collateral held varies, but may include residential and commercial property, deposits and securities.

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Income Taxes	12. Income Taxes Income tax expense for the years ended December 31, 2016, 2015 and 2014 consisted of: 2016 2015 2014 (In thousands) Current provision: Federal $ 6,838 $ 5,113 $ 2,147 State 226 694 718 Total current 7,064 5,807 2,865 Deferred provision: Federal (1,104 ) (1,749 ) (557 ) State — 783 (139 ) Total deferred (1,104 ) (966 ) (696 ) Total income tax expense $ 5,960 $ 4,841 $ 2,169 In October, 2015, the Company created Bankwell Loan Servicing Group, Inc., a Passive Investment Company (“PIC”) organized for state income tax purposes. The PIC is a wholly-owned subsidiary of the Bank operating in accordance with Connecticut statutes. The PIC’s activities are limited in scope to holding and managing loans that are collateralized by real estate. Income earned by a PIC is exempt from Connecticut income tax. In addition, any dividends paid by the PIC to the Bank are not taxable income for Connecticut income tax purposes. As a result of the formation of the PIC, the Bank no longer expects to be subject to Connecticut income taxes. State taxes are being recognized for income taxes on income earned in other states. A reconciliation of the anticipated income tax expense, computed by applying the statutory federal income tax rate of 35% to the income before income taxes, to the amount reported in the consolidated statements of income for the years ended December 31, 2016, 2015 and 2014 was as follows: December 31, 2016 2015 2014 (In thousands) Income tax expense at statutory federal rate $ 6,409 $ 4,855 $ 2,291 State tax expense, net of federal tax effect 147 566 259 Statutory rate reductions — 811 — Income exempt from tax (687 ) (627 ) (523 ) Other items, net 91 42 19 Income tax expense before change in valuation allowance 5,960 5,647 2,046 Change in valuation allowance — (806 ) 123 Income tax expense $ 5,960 $ 4,841 $ 2,169 At December 31, 2016 and 2015, the components of deferred tax assets and liabilities were as follows: December 31, 2016 2015 (In thousands) Deferred tax assets: Allowance for loan losses $ 6,378 $ 5,086 Net operating loss carryforwards 996 1,162 Purchase accounting adjustments 20 228 Deferred fees 1,437 1,262 Deferred expenses 716 767 Start-up costs 275 317 Unrealized loss on derivatives — 96 Depreciation — 82 Other 192 201 Gross deferred tax assets 10,014 9,201 Deferred tax liabilities: Tax bad debt reserve 195 645 Depreciation 255 — Unrealized gain on derivatives 258 — Unrealized gain on available for sale securities 221 219 Gross deferred tax liabilities 929 864 Net deferred tax asset $ 9,085 $ 8,337 A valuation allowance against deferred tax assets is required if, based on the weight of available evidence, it is more-likely-than-not that some or all of the deferred tax assets will not be realized. At December 31, 2014, management recorded a valuation allowance against the deferred tax benefits of the state net operating loss carry forwards and other state deferred tax assets for the Bank Holding Company. During 2015, the Company derecognized its state deferred tax assets, and reversed the related valuation allowances. Management has evaluated its remaining deferred tax assets and believes no valuation allowances are needed at December 31, 2016. At December 31, 2016, the Company had federal net operating loss carryovers of  $2.8 million. The carryovers were transferred to the Company upon the mergers with The Wilton Bank. The losses will expire after 2032 and are subject to certain annual limitations which amount to $176 thousand per annum. Management regularly analyzes their tax positions and at December 31, 2016, does not believe that the Company has taken any tax positions where future deductibility is not certain. In addition, management has established a reserve for uncertain tax positions in conjunction with our out of state lending activity. The tax years 2013 and subsequent, are subject to examination by federal and state taxing authorities. The statute of limitations has expired on the years before 2013. No examinations are currently in process.

401(k) Profit Sharing Plan

401(k) Profit Sharing Plan	12 Months Ended
	Dec. 31, 2016
Compensation and Retirement Disclosure [Abstract]
401(k) Profit Sharing Plan	13. 401(K) Profit Sharing Plan The Company’s employees are eligible to participate in The Bankwell Financial Group, Inc. and its Subsidiaries and Affiliates 401(k) Plan (the “401k Plan”). The 401k Plan covers substantially all employees who are 21 years of age. Under the terms of the 401k Plan, participants can contribute up to a certain percentage of their compensation, subject to federal limitations. The Company matches eligible contributions and may make discretionary matching and/or profit sharing contributions. Participants are immediately vested in their contributions and become fully vested in the Company’s contributions after completing five years of service. The Company expensed $227 thousand, $173 thousand and $151 thousand related to the 401k Plan during the years ended December 31, 2016, 2015 and 2014, respectively.

Earnings per Share

Earnings per Share	12 Months Ended
	Dec. 31, 2016
Earnings Per Share [Abstract]
Earnings per Share	14. Earnings Per Share Basic earnings per share (“EPS”) is computed by dividing income available to common shareholders by the weighted-average number of shares of common stock outstanding for the period. Diluted EPS reflects the potential dilution that could occur if securities or other contracts to issue common stock (such as stock options) were exercised or converted into common stock or resulted in the issuance of common stock that then shared in earnings. Restricted stock awards include the right to receive non forfeitable dividends, and are therefore, considered to participate with common stock in undistributed earnings for purposes of computing EPS. The Company’s unvested restricted stock awards are participating securities, and therefore, are included in the computation of both basic and diluted earnings per common share. EPS is calculated using the two class method, under which calculations (1) exclude from the numerator any dividends paid or owed on participating securities and any undistributed earnings considered to be attributable to participating securities and (2) exclude from the denominator the dilutive impact of the participating securities. The following is a reconciliation of earnings available to common shareholders and basic weighted average common shares outstanding to diluted weighted average common shares outstanding, reflecting the application of the two-class method: For the Years Ended December 31, 2016 2015 2014 (In thousands, except per share data) Net income $ 12,350 $ 9,030 $ 4,568 Preferred stock dividends — (125 ) (110 ) Dividends to participating securities (27 ) (5 ) — Undistributed earnings allocated to participating securities (211 ) (226 ) (81 ) Net income for earnings per share calculation $ 12,112 $ 8,674 $ 4,377 Weighted average shares outstanding, basic 7,396 7,072 5,578 Effect of dilutive equity-based awards 95 69 28 Weighted average shares outstanding, diluted 7,491 7,141 5,606 Net earnings per common share: Basic earnings per common share $ 1.64 $ 1.23 $ 0.78 Diluted earnings per common share 1.62 1.21 0.78

Stock Based Compensation Plans

Stock Based Compensation Plans	12 Months Ended
	Dec. 31, 2016
Compensation and Retirement Disclosure [Abstract]
Stock Based Compensation Plans	15. Stock Based Compensation Plans Equity award plans The Company has five equity award plans, which are collectively referred to as the “Plan.” The current plan under which any future issuances of equity awards will be made is the 2012 BNC Financial Group, Inc. Stock Plan, or the “2012 Plan,” amended on June 26, 2013. All equity awards made under the 2012 Plan are made by means of an award agreement, which contains the specific terms and conditions of the grant. To date, all equity awards have been in the form of share options or restricted stock. At December 31, 2016, there were 480,372 shares reserved for future issuance under the 2012 Plan. Stock Options There were no options granted during the years ended December 31, 2016, 2015 and 2014. A summary of the status of outstanding stock options at December 31, 2016 and changes during the periods then ended, were as follows: December 31, Number of Weighted Options outstanding at beginning of period 195,928 $ 18.07 Exercised (64,120 ) 17.15 Expired (10,820 ) 17.85 Options outstanding at end of period 120,988 18.58 Options exercisable at end of period 119,538 18.62 Total intrinsic value is the amount by which the fair value of the underlying stock exceeds the exercise price of an option on the exercise date. The total intrinsic value of share options exercised during the years ended December 31, 2016, 2015 and 2014 was $597 thousand, $170 thousand and $214, respectively. Restricted Stock: The following table presents the activity for restricted stock for the year ended December 31, 2016: December 31, Number of Weighted Unvested at beginning of period 143,325 $ 15.92 Granted 29,933 22.45 Vested (75,781 ) 16.66 Forfeited (883 ) 20.39 Unvested at end of period 96,594 19.80 The Company’s restricted stock expense for the years ended December 31, 2016, 2015 and 2014 was $1.2 million, $1.0 million and $542 thousand, respectively. Market Conditions Restricted Stock: In January 2016 the Company modified the market conditions restricted stock grant. The total shares originally granted for the $29.00 price target have been modified to a time based restricted stock grant. The shares will vest over a four year period with the first installment vesting on December 1, 2016 and the remaining shares to vest on each annual anniversary thereafter. In addition, the shares originally granted for the $25.00 and $27.00 price targets have been modified. These shares vest over a period from the date of the modification to December 1, 2019 based on meeting the price targets. The price targets will be met when the 30 day average stock price meets or exceeds the price targets. The Company determined the fair market value of the modified awards for the $25.00 and $27.00 price targets in accordance with ASC 718 Stock Compensation using the Monte Carlo simulation model deemed appropriate for this type of modification. The Company will expense an incremental cost associated with this modification of  $2.19 for the awards that vest at the $25 stock price, $2.03 for the awards that vest at the $27 stock price and $13.66 for the awards that were modified to a time based grant. The remaining and incremental expense will be recognized on a straight line basis over the requisite service period. The shares granted for the $25.00 and $27.00 price targets fully vested in the fourth quarter of 2016 based on meeting the vesting terms of the grant. The Company recognized $304 thousand, $134 thousand and $14 thousand in stock compensation expense for the years ended December 31, 2016, 2015 and 2014 for these restricted stock awards, respectively.

Comprehensive Income

Comprehensive Income	12 Months Ended
	Dec. 31, 2016
Comprehensive Income [Abstract]
Comprehensive Income	16. Comprehensive Income Comprehensive income represents the sum of net income and items of other comprehensive income or loss, including net unrealized gains or losses on securities available for sale and net gains or losses on derivatives accounted for as cash flow hedges. The Company’s total comprehensive income or loss for the years ended December 31, 2016, 2015 and 2014 is reported in the Consolidated Statements of Comprehensive Income. The following tables present the changes in accumulated other comprehensive income (loss) by component, net of tax for the years ended December 31, 2016, 2015 and 2014: Net Unrealized Gain Net Unrealized Gain Total (In thousands) Balance at December 31, 2015 $ 405 $ (178 ) $ 227 Other comprehensive (loss) income before reclassifications (109 ) 659 550 Amounts reclassified from accumulated other comprehensive 113 — 113 Net other comprehensive income 4 659 663 Balance at December 31, 2016 $ 409 $ 481 $ 890 Net Unrealized Gain Net Unrealized Gain Total (In thousands) Balance at December 31, 2014 $ 644 $ (113 ) $ 531 Other comprehensive loss before reclassifications (239 ) (65 ) (304 ) Amounts reclassified from accumulated other comprehensive — — — Net other comprehensive loss (239 ) (65 ) (304 ) Balance at December 31, 2015 $ 405 $ (178 ) $ 227 Net Unrealized Gain Net Unrealized Gain Total (In thousands) Balance at December 31, 2013 $ 424 $ — $ 424 Other comprehensive income (loss) before reclassifications 220 (113 ) 107 Amounts reclassified from accumulated other comprehensive — — — Net other comprehensive income (loss) 220 (113 ) 107 Balance at December 31, 2014 $ 644 $ (113 ) $ 531

Derivative Instruments

Derivative Instruments	12 Months Ended
	Dec. 31, 2016
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Instruments	17. Derivative Instruments Information about derivative instruments for the years ended December 31, 2016 and 2015 were as follows: December 31, 2016: Notional Original Received Paid Fair (Dollars in thousands) Cash flow hedge: Interest rate swap on FHLB advance $ 25,000 4.7 years 3-month LIBOR 1.62 % $ (91 ) Interest rate swap on FHLB advance $ 25,000 5.0 years 3-month LIBOR 1.83 % (138 ) Interest rate swap on FHLB advance $ 25,000 5.0 years 3-month LIBOR 1.48 % 249 Interest rate swap on FHLB advance $ 25,000 5.0 years 3-month LIBOR 1.22 % 717 $ 737 December 31, 2015: Notional Original Received Paid Fair (Dollars in thousands) Cash flow hedge: Interest rate swap on FHLB advance $ 25,000 4.7 years 3-month LIBOR 1.62 % $ (181 ) Interest rate swap on FHLB advance $ 25,000 5.0 years 3-month LIBOR 1.83 % (276 ) Interest rate swap on FHLB advance $ 25,000 5.0 years 3-month LIBOR 1.48 % 181 $ (276 ) The effective portion of unrealized changes in the fair value of derivatives accounted for as cash flow hedges is reported in other comprehensive income and subsequently reclassified to earnings in the same period or periods during which the hedged forecasted transaction affects earnings. The Bank assesses the effectiveness of each hedging relationship by comparing the changes in cash flows of the derivative hedging instrument with the changes in cash flows of the designated hedged item or transaction. The ineffective portion of changes in the fair value of the derivatives is recognized directly in earnings. The Bank’s cash flow hedge positions are all forward starting interest rate swap transactions. The Bank entered into the following forward starting interest rate swap transactions: Notional Effective Date of Duration of Counterparty (Dollars in thousands) Type of borrowing: FHLB 90-day advance $ 25,000 April 1, 2014 4.7 years Bank of Montreal FHLB 90-day advance $ 25,000 January 2, 2015 5.0 years Bank of Montreal FHLB 90-day advance $ 25,000 August 26, 2015 5.0 years Bank of Montreal FHLB 90-day advance $ 25,000 July 1, 2016 5.0 years Bank of Montreal This hedge strategy converts the floating rate of interest on certain FHLB advances to fixed interest rates, thereby protecting the Bank from floating interest rate variability. Changes in the consolidated statements of comprehensive income related to interest rate derivatives designated as hedges of cash flows were as follows for the years ended December 31, 2016 and 2015: December 31, December 31, (In thousands) Interest rate swap on FHLB advance: Unrealized gain (loss) recognized in accumulated other comprehensive income $ 1,013 $ (89 ) Income tax (expense) benefit on items recognized in accumulated other comprehensive income (354 ) 24 Other comprehensive income (loss) $ 659 $ (65 ) Amount recognized in interest expense on hedged FHLB advance $ 1,386 $ 991

Fair Value of Financial Instrum

Fair Value of Financial Instruments	12 Months Ended
	Dec. 31, 2016
Fair Value Disclosures [Abstract]
Fair Value of Financial Instruments	18. Fair Value of Financial Instruments GAAP requires disclosure of fair value information about financial instruments, whether or not recognized in the statements of condition, for which it is practicable to estimate that value. In cases where quoted market prices are not available, fair values are based on estimates using present value or other valuation techniques. Those techniques are significantly affected by the assumptions used, including the discount rates and estimates of future cash flows. In that regard, the derived fair value estimates cannot be substantiated by comparisons to independent markets and, in many cases, could not be realized in immediate settlement of the instrument. Management uses its best judgment in estimating the fair value of the Company’s financial instruments; however, there are inherent weaknesses in any estimation technique. Therefore, for substantially all financial instruments, the fair value estimates presented herein are not necessarily indicative of the amounts the Company could have realized in a sales transaction. The estimated fair value amounts have been measured as of the respective period-ends, and have not been reevaluated or updated for purposes of these consolidated financial statements subsequent to those respective dates. As such, the estimated fair values of these financial instruments subsequent to the respective reporting dates may be different than the amounts reported at each period-end. The carrying values, fair values and placement in the fair value hierarchy of the Company’s financial instruments at December 31, 2016 and 2015 were as follows: December 31, 2016 Carrying Fair Level 1 Level 2 Level 3 (In thousands) Financial Assets: Cash and due from banks $ 96,026 $ 96,026 $ 96,026 $ — $ — Federal funds sold 329 329 329 — — Available for sale securities 87,751 87,751 — 87,751 — Held to maturity securities 16,859 16,851 — 16,851 — Loans held for sale 254 254 — 254 — Loans receivable, net 1,343,895 1,339,055 — — 1,339,055 Accrued interest receivable 4,958 4,958 — — 4,958 FHLB stock 7,943 7,943 — — 7,943 Derivative asset 737 737 — 737 — Financial Liabilities: Demand deposits $ 187,593 $ 187,593 $ — $ — $ 187,593 NOW and money market 402,982 402,982 — — 402,982 Savings 96,601 96,601 — — 96,601 Time deposits 601,861 603,456 — — 603,456 Advances from the FHLB 160,000 160,118 — — 160,118 Subordinated debentures 25,051 25,645 — — 25,645 December 31, 2015 Carrying Fair Level 1 Level 2 Level 3 (In thousands) Financial Assets: Cash and due from banks $ 49,562 $ 49,562 $ 49,562 $ — $ — Federal funds sold 39,035 39,035 39,035 — — Available for sale securities 40,581 40,581 — 40,581 — Held to maturity securities 10,226 10,228 — 10,228 — Loans receivable, net 1,129,748 1,135,227 — — 1,135,227 Accrued interest receivable 4,071 4,071 — — 4,071 FHLB stock 6,554 6,554 — — 6,554 Financial Liabilities: Demand deposits $ 164,553 $ 164,553 $ — $ — $ 164,553 NOW and money market 347,846 347,846 — — 347,846 Savings 97,846 97,846 — — 97,846 Time deposits 436,697 438,214 — — 438,214 Advances from the FHLB 120,000 120,025 — — 120,025 Subordinated debentures 25,000 24,505 — — 24,505 Derivative liability 276 276 — 276 —

Fair Value Measurements

Fair Value Measurements	12 Months Ended
	Dec. 31, 2016
Fair Value Disclosures [Abstract]
Fair Value Measurements	19. Fair Value Measurements The Company is required to account for certain assets at fair value on a recurring or non-recurring basis. As discussed in Note 1, the Company determines fair value in accordance with GAAP, which defines fair value and establishes a framework for measuring fair value. Fair value is defined as the exchange price that would be received for an asset or paid to transfer a liability (exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. GAAP establishes a fair value hierarchy which requires an entity to maximize the use of observable inputs and minimize the use of unobservable inputs when measuring fair value. The standard describes three levels of inputs that may be used to measure fair values: Level 1 — Quoted prices (unadjusted) for identical assets or liabilities in active markets that the entity has the ability to access as of the measurement date. Level 2 — Significant other observable inputs other than Level 1 prices such as quoted prices for similar assets or liabilities; quoted prices in markets that are not active; or other inputs that are observable or can be corroborated by observable market data. Level 3 — Significant unobservable inputs that reflect a company’s own assumptions about the assumptions that market participants would use in pricing an asset or liability. Valuation techniques based on unobservable inputs are highly subjective and require judgments regarding significant matters such as the amount and timing of future cash flows and the selection of discount rates that may appropriately reflect market and credit risks. Changes in these judgments often have a material impact on the fair value estimates. In addition, since these estimates are as of a specific point in time they are susceptible to material near-term changes. Assets and Liabilities measured at fair value on a recurring basis The following tables detail the financial instruments carried at fair value on a recurring basis at December 31, 2016 and 2015, and indicates the fair value hierarchy of the valuation techniques utilized by the Company to determine the fair value. The Company had no transfers into or out of Levels 1, 2 or 3 during the years ended December 31, 2016 and 2015. Fair Value Level 1 Level 2 Level 3 (In thousands) December 31, 2016: Available for sale investment securities: U.S. Government and agency obligations $ — $ 62,698 $ — State agency, U.S. territories and municipal obligations — 14,763 — Corporate bonds — 10,290 — Derivative asset — 737 — December 31, 2015: Available for sale investment securities: U.S. Government and agency obligations $ — $ 7,143 $ — State agency, U.S. territories and municipal obligations — 17,504 — Corporate bonds — 11,437 — Mortgage backed securities — 4,497 — Derivative liability — (276 ) — Available for sale investment securities: Derivative Assets and liabilities: Financial instruments measured at fair value on a nonrecurring basis Certain assets and liabilities are measured at fair value on a non-recurring basis in accordance with generally accepted accounting principles. These include assets that are measured at the-lower-of-cost-or market that were recognized at fair value below cost at the end of the period as well as assets that are not measured at fair value on an ongoing basis but are subject to fair value adjustments in certain circumstances, such as when there is evidence of impairment. The following table details the financial instruments carried at fair value on a nonrecurring basis at December 31, 2016 and 2015, and indicates the fair value hierarchy of the valuation techniques utilized by the Company to determine the fair value: Fair Value Level 1 Level 2 Level 3 (In thousands) December 31, 2016: Impaired loans $ — $ — $ 4,849 Foreclosed real estate — — 272 December 31, 2015: Impaired loans $ — $ — $ 10,922 Foreclosed real estate — — 1,248 The following table presents information about quantitative inputs and assumptions for Level 3 financial instruments carried at fair value on a nonrecurring basis at December 31, 2016 and 2015: Fair Valuation Unobservable Range (Dollars in thousands) December 31, 2016: Impaired loans $ 4,849 Appraisals Discount to appraised value 8.00 – 28.00% Discounted cash flows Discount rate 4.25 – 6.25% Foreclosed real $ 272 Appraisals Discount to appraised value 20% December 31, 2015: Impaired loans $ 10,922 Appraisals Discount to appraised value 8.00% to 10.00% Discounted cash flows Discount rate 3.25% to 7.00% Foreclosed real $ 1,248 Appraisals Discount to appraised value 10.0% to 25.0% Impaired loans Foreclosed real estate:

Regulatory Matters

Regulatory Matters	12 Months Ended
	Dec. 31, 2016
Banking and Thrift [Abstract]
Regulatory Matters	20. Regulatory Matters The Federal Reserve, the FDIC and the other federal and state bank regulatory agencies establish regulatory capital guidelines for U.S. banking organizations. As of January 1, 2015, the Company and the Bank became subject to new capital rules set forth by the Federal Reserve, the FDIC and the other federal and state bank regulatory agencies. The new capital rules revise the banking agencies’ leverage and risk-based capital requirements and the method for calculating risk weighted assets to make them consistent with agreements that were reached by the Basel Committee on Banking Supervision and certain provisions of the Dodd-Frank Act (the Basel III Capital Rules). The Basel III Capital Rules establish a new minimum common equity Tier 1 capital requirement of 4.5% of risk-weighted assets; set the minimum leverage ratio at 4% of total assets; increased the minimum Tier 1 capital to risk-weighted assets requirement from 4% to 6%; and retained the minimum total capital to risk weighted assets requirement at 8.0%. A “well-capitalized” institution must generally maintain capital ratios 200 basis points higher than the minimum guidelines. The Basel III Capital Rules also change the risk weights assigned to certain assets. The Basel III Capital Rules assigned a higher risk weight (150%) to loans that are more than 90 days past due or are on nonaccrual status and to certain commercial real estate facilities that finance the acquisition, development or construction of real property. The Basel III Capital Rules also alter the risk weighting for other assets, including marketable equity securities that are risk weighted generally at 300%. The Basel III Capital Rules require certain components of accumulated other comprehensive income (loss) to be included for purposes of calculating regulatory capital requirements unless a one-time opt-out is exercised. The Bank did exercise its opt-out option and will exclude the unrealized gain (loss) on investment securities component of accumulated other comprehensive income (loss) from regulatory capital. The Basel III Capital Rules limit a banking organization’s capital distributions and certain discretionary bonus payments to executive officers if the banking organization does not hold a “capital conservation buffer” consisting of 2.5% in addition to the minimum risk based capital requirement. The “capital conservation buffer” is being phased in from January 1, 2016 to January 1, 2019, when the full capital conservation buffer will be effective. Failure to meet minimum capital requirements can initiate certain mandatory and possibly additional discretionary actions by regulators that, if undertaken, could have a direct material effect on the Company’s consolidated financial statements. Management believes, as of December 31, 2016, the Bank and Company meet all capital adequacy requirements to which they are subject. There are no conditions or events since then that management believes have changed this conclusion. The capital amounts and ratios for the Bank and the Company at December 31, 2016 were as follows: Actual Capital For Capital To be Well Amount Ratio Amount Ratio Amount Ratio (Dollars in thousands) Bankwell Bank December 31, 2016 Common Equity Tier 1 Capital to Risk-Weighted Assets $ 157,604 11.59 % $ 61,168 4.50 % $ 88,353 6.50 % Total Capital to Risk-Weighted Assets 174,610 12.85 % 108,742 8.00 % 135,928 10.00 % Tier I Capital to Risk-Weighted Assets 157,604 11.59 % 81,557 6.00 % 108,742 8.00 % Tier I Capital to Average Assets 157,604 10.10 % 62,428 4.00 % 78,035 5.00 % Bankwell Financial Group, Inc. December 31, 2016 Common Equity Tier 1 Capital to Risk-Weighted Assets $ 141,338 10.82 % $ 58,789 4.50 % N/A N/A Total Capital to Risk-Weighted Assets 184,371 14.11 % 104,513 8.00 % N/A N/A Tier I Capital to Risk-Weighted Assets 141,338 10.82 % 78,385 6.00 % N/A N/A Tier I Capital to Average Assets 141,338 9.06 % 62,415 4.00 % N/A N/A The capital amounts and ratios for the Bank and Company at December 31, 2015, were as follows: Actual Capital For Capital To be Well Amount Ratio Amount Ratio Amount Ratio (Dollars in thousands) Bankwell Bank December 31, 2015 Common Equity Tier 1 Capital to Risk-Weighted Assets $ 142,651 12.18 % $ 52,709 4.50 % $ 76,135 6.50 % Total Capital to Risk-Weighted Assets 156,820 13.39 % 93,705 8.00 % 117,131 10.00 % Tier I Capital to Risk-Weighted Assets 142,651 12.18 % 70,279 6.00 % 93,705 8.00 % Tier I Capital to Average Assets 142,651 10.84 % 52,620 4.00 % 65,775 5.00 % Bankwell Financial Group, Inc. December 31, 2015 Common Equity Tier 1 Capital to Risk-Weighted Assets $ 128,692 10.92 % $ 53,052 4.50 % N/A N/A Total Capital to Risk-Weighted Assets 167,867 14.24 % 94,315 8.00 % N/A N/A Tier I Capital to Risk-Weighted Assets 128,692 10.92 % 70,736 6.00 % N/A N/A Tier I Capital to Average Assets 128,692 9.75 % 52,819 4.00 % N/A N/A Regulatory Restrictions on dividends The ability of the Company to pay dividends depends, in part, on the ability of the Bank to pay dividends to the Company. In accordance with Connecticut statutes, regulatory approval is required to pay dividends in excess of the Bank’s profits retained in the current year plus retained profits from the previous two years. The Bank is also prohibited from paying dividends that would reduce its capital ratios below minimum regulatory requirements.

Related Party Transactions

Related Party Transactions	12 Months Ended
	Dec. 31, 2016
Related Party Transactions [Abstract]
Related Party Transactions	21. Related Party Transactions In the normal course of business, the Company may grant loans to executive officers, directors and members of their immediate families, as defined, and to entities in which these individuals have more than a 10% equity ownership. Such loans are transacted at terms including interest rates, similar to those available to unrelated customers. Changes in loans outstanding to such related parties during the years ending December 31, 2016 and 2015 were as follows: December 31, 2016 2015 (In thousands) Balance, beginning of year $ 12,891 $ 7,509 Additional loans 9,722 5,476 Repayments and changes in status (142 ) (94 ) Balance, end of year $ 22,471 $ 12,891 Related party deposits aggregated approximately $40.4 million and $23.1 million at December 31, 2016 and 2015, respectively. During the years ended December 31, 2016 and 2015, the Company paid approximately $28 thousand and $66 thousand, respectively, to related parties for services provided to the Company. The payments were primarily for consulting and legal services.

Parent Corporation Only Financi

Parent Corporation Only Financial Statements	12 Months Ended
	Dec. 31, 2016
Parent Corporation Only Financial Statements [Abstract]
Parent Corporation Only Financial Statements	22. Parent Corporation Only Financial Statements The Parent Company operates its wholly-owned subsidiary, Bankwell Bank. The earnings of this subsidiary are recognized by the Company using the equity method of accounting. Accordingly, earnings are recorded as increases in the Company’s investment in the subsidiary and dividends paid reduce the investment in the subsidiary. Condensed financial statements of the Parent Company only are as follows: Condensed Statements of Financial Condition December 31, 2016 2015 (Dollars in Thousands) ASSETS Cash and due from banks $ 5,677 $ 5,692 Investment in subsidiary 162,162 145,729 Premises and equipment, net 55 120 Deferred income taxes, net 3,063 5,448 Other assets 3,889 2,060 Total assets $ 174,846 $ 159,049 LIABILITIES AND SHAREHOLDERS’ EQUITY Subordinated debentures $ 25,051 $ 25,000 Accrued expenses and other liabilities 3,900 2,280 Stockholders’ equity 145,895 131,769 Total liabilities and stockholders’ equity $ 174,846 $ 159,049 Condensed Statements of Income Year Ended December 31, 2016 2015 2014 (Dollars in Thousands) Interest income $ 23 $ 38 $ 45 Other income — — — Total income 23 38 45 Expenses 3,444 2,714 1,728 Loss before equity in undistributed earnings of subsidiaries (3,421 ) (2,676 ) (1,683 ) Equity in undistributed earnings of subsidiaries 15,771 11,706 6,251 Net Income $ 12,350 $ 9,030 $ 4,568 Condensed Statements of Cash Flows For the Years Ended December 31, 2016 2015 2014 (Dollars in Thousands) Cash flows from operating activities Net income $ 12,350 $ 9,030 $ 4,568 Adjustments to reconcile net income to net cash used by operating activities: Equity in undistributed earnings (15,771 ) (11,706 ) (6,251 ) Increase in other assets (1,828 ) (418 ) (1,245 ) Decrease (Increase) in deferred income taxes, net 2,385 (2,192 ) (846 ) Increase in other liabilities 1,620 421 641 Stock-based compensation 1,188 1,033 573 Net cash used by operating activities (56 ) (3,832 ) (2,560 ) Cash flows from investing activities Cash paid for acquisitions — — (3,648 ) Capital contribution to Bankwell Bank — (15,000 ) (40,000 ) Decrease in premises and equipment, net 65 84 85 Net cash provided by (used by) investing activities 65 (14,916 ) (43,563 ) Cash flows from financing activities Proceeds from issuance of subordinated debt — 25,000 — Amortization of debt issuance costs 51 — — Redemption of SBLF Preferred Stock — (10,980 ) — Proceeds from exercise of options 1,106 501 207 Dividends paid on common stock (1,661 ) (376 ) — Dividends paid on preferred stock — (125 ) (110 ) Proceeds from issuance of common stock 200 3,780 44,704 Net tax benefit related to stock-based compensation 280 — — Net cash (used by) provided by financing activities (24 ) 17,800 44,801 Net decrease in cash and cash equivalents (15 ) (948 ) (1,322 ) Cash and cash equivalents: Beginning of year 5,692 6,640 7,962 End of year $ 5,677 $ 5,692 $ 6,640 Supplemental disclosures of cash flows information: Cash paid for: Interest $ — $ — $ — Income taxes — — —

Quarterly Financial Information

Quarterly Financial Information of Bankwell Financial Group, Inc. (Unaudited)	12 Months Ended
	Dec. 31, 2016
Quarterly Financial Information Disclosure [Abstract]
Quarterly Financial Information of Bankwell Financial Group, Inc. (Unaudited)	23. Quarterly Financial Information of Bankwell Financial Group, Inc. (Unaudited) The following table presents selected quarterly financial information (unaudited): 2016 4th Quarter 3rd Quarter 2nd Quarter 1st Quarter Total interest income $ 16,642 $ 15,633 $ 14,711 $ 14,004 Total interest expense 3,354 3,106 2,832 2,606 Net interest income 13,288 12,527 11,879 11,398 Provision for loan losses 748 1,219 1,301 646 Non-interest income 401 750 853 672 Non-interest expense 7,768 7,481 7,215 7,080 Income before income taxes 5,173 4,577 4,216 4,344 Provision from income taxes 1,850 1,437 1,320 1,353 Net income $ 3,323 $ 3,140 $ 2,896 $ 2,991 Net income attributable to common stockholders $ 3,323 $ 3,140 $ 2,896 $ 2,991 Earnings per share: Basic $ 0.44 $ 0.42 $ 0.38 $ 0.40 Diluted $ 0.43 $ 0.41 $ 0.38 $ 0.40 2015 4th Quarter 3rd Quarter 2nd Quarter 1st Quarter Total interest income $ 13,907 $ 13,186 $ 12,388 $ 11,273 Total interest expense 2,671 2,269 1,647 1,379 Net interest income 11,236 10,917 10,741 9,894 Provision for loan losses 354 1,489 654 733 Non-interest income 820 1,211 854 599 Non-interest expense 7,661 7,158 7,380 6,972 Income before income taxes 4,041 3,481 3,561 2,788 Provision from income taxes 1,423 1,228 1,275 915 Net income $ 2,618 $ 2,253 $ 2,286 $ 1,873 Net income attributable to common stockholders $ 2,574 $ 2,226 $ 2,259 $ 1,846 Earnings per share: Basic $ 0.35 $ 0.31 $ 0.31 $ 0.26 Diluted $ 0.35 $ 0.31 $ 0.31 $ 0.26 Note: Due to rounding, quarterly earnings per share may not sum to reported annual earnings per share.

Nature of Operations and Summ32

Nature of Operations and Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Principles of consolidation	Principles of consolidation The consolidated financial statements include the accounts of the Company and the Bank. All significant intercompany accounts and transactions have been eliminated in consolidation.
Use of estimates	Use of estimates The accounting and reporting policies of the Company conform to accounting principles generally accepted in the United States of America (“GAAP”) and general practices within the banking industry. In preparing the consolidated financial statements, management is required to make estimates and assumptions that affect the reported amounts of assets and liabilities, and disclosures of contingent assets and liabilities as of the date of the consolidated balance sheet and revenue and expenses for the period. Actual results could differ from those estimates. Material estimates that are particularly susceptible to significant change in the near term relate to estimates related to the initial measurement of goodwill and intangible assets and subsequent impairment analyses; the allowance for loan losses; stock-based compensation; and derivative instrument valuation.
Segments	Segments The Company has one reportable segment. All of the Company’s activities are interrelated, and each activity is dependent and assessed based on how each of the activities of the Company supports the others. For example, lending is dependent upon the ability of the Company to fund itself with deposits and borrowings while managing the interest rate and credit risk. Accordingly, all significant operating decisions are based upon analysis of the Bank as one segment or unit.
Basis of consolidated financial statement presentation	Basis of consolidated financial statement presentation The consolidated financial statements have been prepared in accordance with GAAP and general practices within the banking industry. Such policies have been followed on a consistent basis.
Cash and Cash Equivalents and Statement of Cash Flows	Cash and Cash Equivalents and Statement of Cash Flows Cash and due from banks and federal funds sold are recognized as cash equivalents in the consolidated statements of cash flows. Federal funds sold generally mature in one day. For purposes of reporting cash flows, all highly liquid debt instruments purchased with an original maturity of three months or less are considered to be cash equivalents. Cash flows from loans and deposits are reported net. The balances of cash and due from banks and federal funds sold, at times, may exceed federally insured limits. The Company has not experienced any losses from such concentrations.
Investment Securities	Investment Securities Management determines the appropriate classifications of investment securities at the date individual investment securities are acquired, and the appropriateness of such classifications is reaffirmed at each balance sheet date. The Company’s investment securities are categorized as either available for sale or held to maturity. Held to maturity investments are carried at amortized cost; available for sale securities are carried at fair value, with unrealized gains and losses excluded from earnings and reported in other comprehensive income (loss) as a separate component of capital, net of estimated income taxes. Investment securities in the available for sale and held-to-maturity portfolios are reviewed quarterly for other-than-temporary impairment (OTTI). If a debt security is below amortized cost, other-than-temporary impairment is deemed to exist if the present value of the expected future cash flows is less than the amortized cost basis of the security. OTTI is required to be recognized regardless of the credit loss component if the Company intends to sell the security or if it is “more-likely-than-not” that the Company will be required to sell the security before recovery of its amortized cost basis. The credit loss component of an other-than-temporary impairment write-down is recorded in earnings, while the remaining portion of the impairment loss is recognized in other comprehensive income (loss), provided the Company does not intend to sell the underlying debt security and it is more-likely-than-not that the Company will not be required to sell the debt security prior to recovery. In determining whether a credit loss exists and the period over which the fair value of the debt security is expected to recover, management considers the following factors: the length of time and extent that fair value has been less than cost, the financial condition and near term prospects of the issuer, any external credit ratings, the level of excess cash flows generated from the underlying collateral supporting the principal and interest payments of the debt securities and the level of credit enhancement provided by the structure. The sale of a held to maturity security within three months of its maturity date or after collection of at least 85% of the principal outstanding at the time the security was acquired is considered a maturity for purposes of classification and disclosure. Purchase premiums and discounts are recognized in interest income using the interest method over the terms of the securities. Gains or losses on the sales of securities are recognized at trade date utilizing the specific identification method.
Bank Owned Life Insurance	Bank Owned Life Insurance The investment in bank owned life insurance (“BOLI”) represents the cash surrender value of life insurance policies on the lives of certain Bank employees who have provided positive consent allowing the Bank to be the beneficiary of such policies. Increases in the cash value of the policies, as well as insurance proceeds received, are recorded in noninterest income, and are not subject to income taxes. The financial strength of the insurance carrier is reviewed prior to the purchase of BOLI and annually thereafter.
Federal Home Loan Bank Stock	Federal Home Loan Bank Stock Federal Home Loan Bank of Boston (“FHLB”) stock is a non-marketable equity security that is carried at cost. There are no quoted market prices for this security and the security is not liquid. The Company can sell these securities back to the FHLB at par.
Loans Held For Sale	Loans Held For Sale Loans held for sale are those loans which management has the intent to sell in the foreseeable future, and are carried at the lower of aggregate cost or market value. Net unrealized losses, if any, are recognized by a valuation allowance through a charge to noninterest income. Realized gains and losses on the sale of loans are recognized on the settlement date and are determined by the difference between the sale proceeds and the carrying value of the loans. Loans may be sold with servicing rights released or retained. At the time of the sale, management records a servicing asset for the value of any retained servicing rights, which represents the present value of the differential between the contractual servicing fee and adequate compensation, defined as the fee a sub-servicer would require to assume the role of servicer, after considering the estimated effects of prepayments.
Loans Receivable	Loans Receivable Loans receivable that management has the ability and intent to hold for the foreseeable future or until maturity or payoff are stated at their current unpaid principal balances, net of the allowance for loan losses, charge-offs, recoveries, net deferred loan origination fees and unamortized loan premiums. Past due or delinquency status for all loans is based on the number of days past due in accordance with its contractual payment terms. A loan is considered impaired when it is probable that all contractual principal or interest payments due will not be collected in accordance with the terms of the loan agreement. Impaired loans are measured based on the present value of expected future cash flows discounted at the loan’s effective interest rate or, as a practical expedient, at the loan’s observable market price or the fair value of the collateral, if the loan is collateral dependent. The amount of impairment, if any, and any subsequent changes are recorded as adjustments to the allowance for loan losses. Management reviews all nonaccrual loans, other loans past due 90 days or more, and restructured loans for impairment. In most cases, loan payments that are past due less than 90 days are considered minor collection delays and the related loans are not considered to be impaired. Consumer installment loans are considered to be pools of small balance homogeneous loans, which are collectively evaluated for impairment. Modifications to a loan are considered to be a troubled debt restructuring (“TDR”) when two conditions are met: 1) the borrower is experiencing financial difficulties and 2) the modification constitutes a concession. Modified terms are dependent upon the financial position and needs of the individual borrower. Debt may be bifurcated with separate terms for each tranche of the restructured debt. The decision to restructure a loan, versus aggressively enforcing the collection of the loan, may benefit the Company by increasing the ultimate probability of collection. If a performing loan is restructured into a TDR it remains in performing status. If a nonperforming loan is restructured into a TDR, it continues to be carried in nonaccrual status. Nonaccrual classification may be removed if the borrower demonstrates compliance with the modified terms for a minimum of six months. TDR’s are reported as such for at least one year from the date of restructuring. In years after the restructuring, troubled debt restructured loans are removed from this classification if the restructuring agreement specifies a market rate of interest equal to that which would be provided to a borrower with similar credit at the time of restructuring and the loan is not deemed to be impaired based on the modified terms.
Acquired Loans	Acquired Loans Loans that the Company acquires in acquisitions are initially recorded at fair value with no carryover of the related allowance for credit losses. Determining the fair value of acquired loans involves estimating the amount and timing of principal and interest cash flows initially expected to be collected on the loans and discounting those cash flows at an appropriate market rate of interest. For loans which meet the criteria stipulated in Accounting Standards Codification (“ASC”) 310-30, “Loans and Debt Securities Acquired with Deteriorated Credit Quality”, the Company recognizes an accretable yield, which is defined as the excess of all cash flows expected at acquisition over the initial fair value of the loan, as interest income on a level-yield basis over the expected remaining life of the loan. The excess of the loan’s contractually required payments over the cash flows expected to be collected is the nonaccretable difference. The nonaccretable difference is not recognized as an adjustment of yield, a loss accrual, or a valuation allowance. After the initial acquisition, the Company continues to evaluate whether the timing and the amount of cash to be collected are reasonably estimated. Subsequent significant increases in cash flows the Company expects to collect will first reduce previously recognized valuation allowance and then be reflected prospectively as an increase to the level yield. Subsequent decreases in expected cash flows may result in the loan being considered impaired. Interest income is not recognized to the extent that the net investment in the loan would increase to an amount greater than the estimated payoff amount. For ASC 310-30 loans, the expected cash flows reflect anticipated prepayments, determined on a loan by loan basis, according to the anticipated collection plan of these loans. Prepayments result in the recognition of the nonaccretable balance as current period yield. Changes in prepayment assumptions may change the amount of interest income and principal expected to be collected. The expected prepayments used to determine the accretable yield are consistent between the cash flows expected to be collected and projections of contractual cash flows so as to not affect the nonaccretable difference. For loans that do not meet the ASC 310-30 criteria, the Company records interest income on a level yield basis using the contractually required cash flows. The Company subjects loans that do not meet the ASC 310-30 criteria to ASC Topic 450, “Contingencies”, by collectively evaluating these loans for an allowance for loan loss, using the same methodology as loans originated by the Company. Acquired loans that met the criteria for nonaccrual of interest prior to the acquisition are considered performing upon acquisition, regardless of whether the customer is contractually delinquent, if the Company can reasonably estimate the timing and amount of the expected cash flows on such loans and if the Company expects to fully collect the new carrying value of the loans. As such, the Company may no longer consider the loan to be nonaccrual or nonperforming and may accrue interest on these loans, including the impact of any accretable yield. The Company has determined that it can reasonably estimate future cash flows on the Company’s current portfolio of acquired loans that are past due 90 days or more, and on which the Company is accruing interest and the Company expects to fully collect the carrying value of the loans.
Allowance For Loan Losses	Allowance For Loan Losses The allowance for loan losses is established as losses are estimated to have occurred through a provision for loan losses charged to earnings. Loan losses are charged against the allowance for loan losses when management believes the non-collectability of a loan balance is confirmed. Subsequent recoveries, if any, are credited to the allowance for loan losses. The allowance for loan losses is evaluated on a regular basis by management and is based upon management’s periodic review of the collectability of the loans in light of historical experience, the nature and volume of the loan portfolio, adverse situations that may affect the borrower’s ability to repay, estimated value of any underlying collateral and prevailing economic conditions. This evaluation is inherently subjective, as it requires estimates that are susceptible to significant revision as more information becomes available. The allowance for loan losses consists of specific and general components. The specific component relates to impaired loans that are classified as doubtful, substandard or special mention. For these loans, an allowance is established when the discounted cash flows, collateral value or observable market price of the impaired loan is lower than the carrying value of that loan. The general component covers non classified loans and is based on historical loss experience adjusted for qualitative factors, and includes unallocated components maintained to cover uncertainties that could affect management’s estimation of probable losses, and reflects the margin of imprecision inherent in the underlying assumptions used in the methodologies for estimating specific and general losses in the portfolio. Management believes the allowance for loan losses is adequate. While management uses available information to recognize losses on loans, future additions to the allowance may be necessary based on changes in economic conditions. In addition, various regulatory agencies, as an integral part of their examination process, periodically review the allowance for loan losses. Such agencies have the authority to require additions to the allowance or charge-offs based on the agencies’ judgments about information available to them at the time of their examination.
Interest and Fees on Loans	Interest and Fees on Loans Interest on loans is accrued and included in income based on contractual rates applied to principal amounts outstanding. Accrual of interest is discontinued when loan payments are 90 days or more past due, based on contractual terms, or when, in the judgment of management, collectability of the loan or loan interest becomes uncertain. When interest accrual is discontinued, all unpaid accrued interest is reversed against interest income. Subsequent recognition of income occurs only to the extent payment is received subject to management’s assessment of the collectability of the remaining interest and principal. A nonaccrual loan is restored to accrual status when it is no longer delinquent and collectability of interest and principal is no longer in doubt. Loan origination fees, net of direct loan origination costs, are deferred and amortized as an adjustment to the loan’s yield generally over the contractual life of the loan, utilizing the interest method.
Goodwill and Intangibles	Goodwill and Intangibles Goodwill represents the excess of the purchase price over the fair value of the net assets acquired in a business combination. Intangible assets are assets acquired in a business combination that lack physical substance but can be distinguished from goodwill because the intangible asset is capable of being sold or exchanged on its own or in combination with related contracts, assets or liabilities. Intangible assets are amortized on a straight-line or accelerated basis over estimated lives. Goodwill is not amortized. Goodwill and identifiable intangible assets are evaluated for impairment annually or whenever events or changes in circumstances indicate the carrying value of these assets may not be recoverable. When these assets are evaluated for impairment, if the carrying amount exceeds fair value, an impairment charge is recorded to income. The fair value is based on observable market prices, when practicable. Other valuation techniques may be used when market prices are unavailable, including estimated discounted cash flows. This type of analysis contains uncertainties because it requires management to make assumptions and to apply judgment to estimate industry economic factors and the profitability of future business strategies. In the event of future changes in fair value, the Company may be exposed to an impairment charge that could be material.
Foreclosed Real Estate	Foreclosed Real Estate Assets acquired through deed in lieu or loan foreclosure are initially recorded at fair value less costs to sell when acquired, establishing a new cost basis. These assets are subsequently accounted for at lower of cost or fair value less estimated costs to sell. If fair value declines subsequent to foreclosure, a valuation allowance is recorded through expense. Operating costs after acquisition are expensed.
Premises and Equipment	Premises and Equipment Premises and equipment are stated at cost, net of accumulated depreciation and amortization. Leasehold improvements are capitalized and amortized over the shorter of the terms of the related leases or the estimated economic lives of the improvements. Depreciation and amortization is charged to operations using the straight-line method over the estimated useful lives of the related assets which range from three to thirty nine years. Gains and losses on dispositions are recognized upon realization. Maintenance and repairs are expensed as incurred and improvements are capitalized.
Income Taxes	Income Taxes Deferred income taxes are recognized for the tax consequences of temporary differences by applying enacted statutory tax rates applicable for future years to differences between financial statement and tax bases of existing assets and liabilities. The effect of tax rate changes on deferred taxes is recognized in the income tax provision in the period that includes the enactment date. A tax valuation allowance is established, as needed, to reduce net deferred tax assets to the amount expected to be realized. In the event it becomes more-likely-than-not that some or all of the deferred tax asset allowances will not be needed, the valuation allowance will be adjusted. In the ordinary course of business there is inherent uncertainty in quantifying the Company’s income tax positions. Income tax positions and recorded tax benefits assessed for all years are subject to examination based upon management’s evaluation of the facts, circumstances, and information available at the reporting date. For those tax positions where it is more-likely-than-not that a tax benefit will be sustained, we have determined the amount of the tax benefit to be recognized by estimating the largest amount of tax benefit that has a greater than 50% likelihood of being realized upon ultimate settlement with a taxing authority that has full knowledge of all relevant information. For those income tax positions where it is not more-likely-than-not that a tax benefit will be sustained, no tax benefit has been recognized in the financial statements. Where applicable, associated interest and penalties have also been recognized. We recognize accrued interest and penalties related to unrecognized tax benefits as a component of income tax expense.
Stock Compensation	Stock Compensation The Company measures and recognizes compensation cost relating to share-based payment transactions based on the grant-date fair value of the equity instruments issued. The fair value of time-based restricted stock is recorded based on the grant date fair value of the Company’s common stock. The fair value of market-based restricted stock is based on values derived using a Monte Carlo based pricing model. The fair value of stock options is determined using the Black-Sholes Option Pricing model. Stock-based compensation costs are recognized over the requisite service period for the awards. Compensation expense reflects the number of awards expected to vest and is adjusted based on awards that ultimately vest. Income tax benefits related to stock compensation in excess of grant date fair value, less any proceeds on exercise, are recognized as an increase to additional paid-in capital upon vesting or exercising and delivery of the stock. Any income tax benefits that are less than grant date fair value less any proceeds on exercise would be recognized as a reduction of additional paid-in capital to the extent of previously recognized income tax benefits and then as compensation expense for the remaining amount.
Earnings Per Share	Earnings Per Share Basic earnings per share (“EPS”) is computed by dividing income available to common shareholders by the weighted-average number of shares of common stock outstanding for the period. Diluted EPS reflects the potential dilution that could occur if dilutive stock options and restricted stock awards were exercised and resulted in the issuance of common stock. Unvested share-based payment awards, that include the right to receive non forfeitable dividends, are considered participating securities and therefore considered to be outstanding in the computation of earnings per share. EPS is calculated using the two class method, under which calculations (1) exclude from the numerator any dividends paid or owed on participating securities and any undistributed earnings considered to be attributable to participating securities and (2) exclude from the denominator the dilutive impact of the participating securities.
Comprehensive Income	Comprehensive Income Accounting principles generally require that recognized revenues, expenses, gains and losses be included in net income. Although certain changes in assets and liabilities, such as unrealized gains and losses on available for sale securities and cash flow hedge transactions, are reported as a separate component of the stockholders’ equity section of the balance sheets, such items, along with net income, are components of comprehensive income.
Fair Values of Financial Instruments	Fair Values of Financial Instruments The Company is required to disclose the fair value for all financial instruments. The following methods and assumptions were used by management in estimating the fair value of its financial instruments: Cash and due from banks, federal funds sold and accrued interest receivable: Investment securities: Fair Value Measurements. FHLB stock: Loans held for sale: The fair value is based upon prevailing market prices. Loans receivable: Derivative asset (liability): Deposits: Borrowings and Subordinated Debentures:
Derivative Instruments	Derivative Instruments The Company enters into interest rate swap agreements as part of the Company’s interest rate risk management strategy. Management applies the hedge accounting provisions of Accounting Standards Codification (“ASC”) Topic 815, and formally documents at inception all relationships between hedging instruments and hedged items, as well as its risk management objectives and strategies for undertaking the various hedges. Additionally, the Company uses dollar offset or regression analysis at the hedge’s inception and for each reporting period thereafter, to assess whether the derivative used in its hedging transaction is expected to be and has been highly effective in offsetting changes in the fair value or cash flows of the hedged item. The Company discontinues hedge accounting when it is determined that a derivative is not expected to be or has ceased to be highly effective as a hedge, and then reflects changes in fair value of the derivative in earnings after termination of the hedge relationship. The Company has characterized all of its interest rate swaps that qualify under Topic 815 hedge accounting as cash flow hedges. Cash flow hedges are used to minimize the variability in cash flows of assets or liabilities, or forecasted transactions caused by interest rate fluctuations, and are recorded at fair value in other assets within the consolidated balance sheet. Changes in the fair value of these cash flow hedges are initially recorded in accumulated other comprehensive income and subsequently reclassified into earnings when the forecasted transaction affects earnings. Any hedge ineffectiveness assessed as part of the Company’s quarterly analysis is recorded directly to earnings.
Reclassification	Reclassification Certain prior period amounts have been reclassified to conform to the 2016 financial statement presentation. These reclassifications only changed the reporting categories and did not affect the results of operations or consolidated financial position.
Recent accounting pronouncements	Recent accounting pronouncements The following section includes changes in accounting principles and potential effects of new accounting guidance and pronouncements. ASU No. 2014-09 — Revenue from Contracts with Customers (Topic 606). ASU No. 2014-12, Compensation — Stock Compensation (Topic 718): “Accounting for Share-Based Payments When the Terms of an Award Provide That a Performance Target Could Be Achieved after the Requisite Service Period (a consensus of the FASB Emerging Issues Task Force).” ASU No. 2015-03, Interest Imputation of Interest (Subtopic 835-20): “Simplifying the Presentation of Debt Issuance Costs.” The amendments in this ASU require that debt issuance costs related to a recognized debt liability be presented in the balance sheet as a direct deduction from the carrying amount of that debt liability, consistent with debt discounts. The recognition and measurement guidance for debt issuance costs are not affected by the amendments in this ASU. The amendments are effective for annual and interim periods beginning after December 15, 2015, with early adoption permitted. The Company elected to early adopt the provisions of ASU 2015-03 upon issuance of its subordinated debentures on August 19, 2015 and recorded $0.5 million of debt issuance costs incurred as a direct deduction from the debt liability. ASU No. 2016-01, Financial Instruments — Overall (Subtopic 825-10): “Recognition and Measurement of Financial Assets and Financial Liabilities.” ASU 2016-02, Leases (Topic 842). ASU 2016-09, Compensation Stock — Compensation (Topic 718): “Improvements to Employee Share Based Payment Accounting.” ASU No. 2016-13, Financial Instruments — Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments. ASU No. 2016-15, Statement of Cash Flows (Topic 230): “Classification of Certain Cash Receipts and Cash Payments.” ASU No. 2016-18, Statement of Cash Flows (Topic 230): “Restricted Cash”

Goodwill and other intangible33

Goodwill and other intangible assets (Tables)	12 Months Ended
	Dec. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of goodwill	​ ​ ​ Year Ended ​ ​ Year Ended ​ ​ ​ ​ (In thousands) ​ Balance, beginning of the period ​ ​ ​ $ 2,589 ​ ​ ​ ​ $ 2,589 ​ ​ Impairment ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ Balance, end of the period ​ ​ ​ $ 2,589 ​ ​ ​ ​ $ 2,589 ​ ​ ​
Schedule of carrying amounts and accumulated amortization of amortized intangible assets	​ ​ ​ Gross Intangible ​ ​ Accumulated ​ ​ Net Intangible ​ ​ ​ ​ (In thousands) ​ December 31, 2016 ​ ​ ​ ​ Core deposit intangible ​ ​ ​ $ 1,029 ​ ​ ​ ​ $ 528 ​ ​ ​ ​ $ 501 ​ ​ December 31, 2015 ​ ​ ​ ​ Core deposit intangible ​ ​ ​ $ 1,029 ​ ​ ​ ​ $ 377 ​ ​ ​ ​ $ 652 ​ ​ ​

Investment Securities (Tables)

Investment Securities (Tables)	12 Months Ended
	Dec. 31, 2016
Investments, Debt and Equity Securities [Abstract]
Schedule of amortized cost, gross unrealized gains and losses and fair values of available for sale and held to maturity securities	​ ​ ​ December 31, 2016 ​ ​ ​ ​ Amortized ​ ​ Gross Unrealized ​ ​ Fair ​ ​ ​ ​ Gains ​ ​ Losses ​ ​ ​ ​ (In thousands) ​ Available for sale securities: ​ ​ ​ ​ ​ U.S. Government and agency obligations ​ ​ ​ ​ ​ Due from one through five years ​ ​ ​ $ 62,357 ​ ​ ​ ​ $ 295 ​ ​ ​ ​ $ (49 ) ​ ​ ​ ​ $ 62,603 ​ ​ Due after ten years ​ ​ ​ ​ 100 ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ (5 ) ​ ​ ​ ​ ​ 95 ​ ​ ​ ​ ​ ​ ​ 62,457 ​ ​ ​ ​ ​ 295 ​ ​ ​ ​ ​ (54 ) ​ ​ ​ ​ ​ 62,698 ​ ​ State agency and municipal obligations ​ ​ ​ ​ ​ Due from one through five years ​ ​ ​ ​ 827 ​ ​ ​ ​ ​ 24 ​ ​ ​ ​ ​ (3 ) ​ ​ ​ ​ ​ 848 ​ ​ Due from five through ten years ​ ​ ​ ​ 8,045 ​ ​ ​ ​ ​ 189 ​ ​ ​ ​ ​ (1 ) ​ ​ ​ ​ ​ 8,233 ​ ​ Due after ten years ​ ​ ​ ​ 5,623 ​ ​ ​ ​ ​ 178 ​ ​ ​ ​ ​ (119 ) ​ ​ ​ ​ ​ 5,682 ​ ​ ​ ​ ​ ​ ​ 14,495 ​ ​ ​ ​ ​ 391 ​ ​ ​ ​ ​ (123 ) ​ ​ ​ ​ ​ 14,763 ​ ​ Corporate bonds ​ ​ ​ ​ ​ Due in less than one year ​ ​ ​ ​ 2,022 ​ ​ ​ ​ ​ 56 ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ 2,078 ​ ​ Due from one through five years ​ ​ ​ ​ 8,145 ​ ​ ​ ​ ​ 67 ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ 8,212 ​ ​ ​ ​ ​ ​ ​ 10,167 ​ ​ ​ ​ ​ 123 ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ 10,290 ​ ​ Total available for sale securities ​ ​ ​ $ 87,119 ​ ​ ​ ​ $ 809 ​ ​ ​ ​ $ (177 ) ​ ​ ​ ​ $ 87,751 ​ ​ Held to maturity securities: ​ ​ ​ ​ ​ State agency, U.S. Territories and municipal obligations ​ ​ ​ ​ ​ Due from one through five years ​ ​ ​ $ 2,135 ​ ​ ​ ​ $ — ​ ​ ​ ​ $ — ​ ​ ​ ​ $ 2,135 ​ ​ Due after ten years ​ ​ ​ ​ 13,575 ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ 13,575 ​ ​ ​ ​ ​ ​ ​ 15,710 ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ 15,710 ​ ​ Corporate bonds ​ ​ ​ ​ ​ Due from one through five years ​ ​ ​ ​ 1,000 ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ (23 ) ​ ​ ​ ​ ​ 977 ​ ​ Government-sponsored mortgage backed securities ​ ​ ​ ​ ​ No contractual maturity ​ ​ ​ ​ 149 ​ ​ ​ ​ ​ 15 ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ 164 ​ ​ Total held to maturity securities ​ ​ ​ $ 16,859 ​ ​ ​ ​ $ 15 ​ ​ ​ ​ $ (23 ) ​ ​ ​ ​ $ 16,851 ​ ​ ​ ​ ​ ​ December 31, 2015 ​ ​ ​ ​ Amortized ​ ​ Gross Unrealized ​ ​ Fair ​ ​ ​ ​ Gains ​ ​ Losses ​ ​ ​ ​ (In thousands) ​ Available for sale securities: ​ ​ ​ ​ ​ U.S. Government and agency obligations ​ ​ ​ ​ ​ Due in less than one year ​ ​ ​ $ 6,198 ​ ​ ​ ​ $ — ​ ​ ​ ​ $ (77 ) ​ ​ ​ ​ $ 6,121 ​ ​ Due from one through five years ​ ​ ​ ​ 394 ​ ​ ​ ​ ​ 4 ​ ​ ​ ​ ​ (2 ) ​ ​ ​ ​ ​ 396 ​ ​ Due from five through ten years ​ ​ ​ ​ 647 ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ (21 ) ​ ​ ​ ​ ​ 626 ​ ​ Due after ten years ​ ​ ​ ​ 7,239 ​ ​ ​ ​ ​ 4 ​ ​ ​ ​ ​ (100 ) ​ ​ ​ ​ ​ 7,143 ​ ​ State agency, U.S. Territories and municipal obligations ​ ​ ​ ​ 520 ​ ​ ​ ​ ​ 39 ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ 559 ​ ​ Due from five through ten years ​ ​ ​ ​ 9,762 ​ ​ ​ ​ ​ 361 ​ ​ ​ ​ ​ (322 ) ​ ​ ​ ​ ​ 9,801 ​ ​ Due after ten years ​ ​ ​ ​ 6,778 ​ ​ ​ ​ ​ 367 ​ ​ ​ ​ ​ (1 ) ​ ​ ​ ​ ​ 7,144 ​ ​ ​ ​ ​ ​ ​ 17,060 ​ ​ ​ ​ ​ 767 ​ ​ ​ ​ ​ (323 ) ​ ​ ​ ​ ​ 17,504 ​ ​ Corporate bonds ​ ​ ​ ​ ​ Due in less than one year ​ ​ ​ ​ 1,010 ​ ​ ​ ​ ​ 22 ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ 1,032 ​ ​ Due from one through five years ​ ​ ​ ​ 9,233 ​ ​ ​ ​ ​ 156 ​ ​ ​ ​ ​ (9 ) ​ ​ ​ ​ ​ 9,380 ​ ​ Due from five through ten years ​ ​ ​ ​ 1,013 ​ ​ ​ ​ ​ 12 ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ 1,025 ​ ​ ​ ​ ​ ​ ​ 11,256 ​ ​ ​ ​ ​ 190 ​ ​ ​ ​ ​ (9 ) ​ ​ ​ ​ ​ 11,437 ​ ​ Government-sponsored mortgage backed securities ​ ​ ​ ​ ​ No contractual maturity ​ ​ ​ ​ 4,400 ​ ​ ​ ​ ​ 107 ​ ​ ​ ​ ​ (10 ) ​ ​ ​ ​ ​ 4,497 ​ ​ Total available for sale securities ​ ​ ​ $ 39,955 ​ ​ ​ ​ $ 1,068 ​ ​ ​ ​ $ (442 ) ​ ​ ​ ​ $ 40,581 ​ ​ Held to maturity securities: ​ ​ ​ ​ ​ U.S. Government and agency obligations ​ ​ ​ ​ ​ Due in less than one year ​ ​ ​ $ — ​ ​ ​ ​ $ — ​ ​ ​ ​ $ — ​ ​ ​ ​ $ — ​ ​ State agency, U.S. Territories and municipal obligations ​ ​ ​ ​ ​ Due after ten years ​ ​ ​ ​ 9,026 ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ 9,026 ​ ​ Corporate bonds ​ ​ ​ ​ ​ Due from five through ten years ​ ​ ​ ​ 1,000 ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ (19 ) ​ ​ ​ ​ ​ 981 ​ ​ Government-sponsored mortgage backed securities ​ ​ ​ ​ ​ No contractual maturity ​ ​ ​ ​ 200 ​ ​ ​ ​ ​ 21 ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ 221 ​ ​ Total held to maturity securities ​ ​ ​ $ 10,226 ​ ​ ​ ​ $ 21 ​ ​ ​ ​ $ (19 ) ​ ​ ​ ​ $ 10,228 ​ ​ ​
Schedule of fair value and related unrealized losses of temporarily impaired investment securities, aggregated by investment category	​ ​ ​ Length of Time in Continuous Unrealized Loss Position ​ ​ ​ ​ ​ ​ Less Than 12 Months ​ ​ 12 Months or More ​ ​ Total ​ ​ ​ ​ Fair ​ ​ Unrealized ​ ​ Fair ​ ​ Unrealized ​ ​ Fair ​ ​ Unrealized ​ ​ ​ ​ (In thousands) ​ December 31, 2016 ​ ​ ​ ​ ​ ​ ​ U.S. Government and agency obligations ​ ​ ​ $ 3,045 ​ ​ ​ ​ $ (54 ) ​ ​ ​ ​ $ — ​ ​ ​ ​ $ — ​ ​ ​ ​ $ 3,045 ​ ​ ​ ​ $ (54 ) ​ ​ State agency and municipal obligations ​ ​ ​ ​ 2,756 ​ ​ ​ ​ ​ (123 ) ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ 2,756 ​ ​ ​ ​ ​ (123 ) ​ ​ Corporate bonds ​ ​ ​ ​ 978 ​ ​ ​ ​ ​ (23 ) ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ 978 ​ ​ ​ ​ ​ (23 ) ​ ​ Total investment securities ​ ​ ​ $ 6,779 ​ ​ ​ ​ $ (200 ) ​ ​ ​ ​ $ — ​ ​ ​ ​ $ — ​ ​ ​ ​ $ 6,779 ​ ​ ​ ​ $ (200 ) ​ ​ December 31, 2015 ​ ​ ​ ​ ​ ​ ​ U.S. Government and agency obligations ​ ​ ​ $ 5,486 ​ ​ ​ ​ $ (60 ) ​ ​ ​ ​ $ 1,259 ​ ​ ​ ​ $ (40 ) ​ ​ ​ ​ $ 6,745 ​ ​ ​ ​ $ (100 ) ​ ​ State agency, U.S. Territories and municipal ​ ​ ​ ​ 126 ​ ​ ​ ​ ​ (1 ) ​ ​ ​ ​ ​ 665 ​ ​ ​ ​ ​ (322 ) ​ ​ ​ ​ ​ 791 ​ ​ ​ ​ ​ (323 ) ​ ​ Corporate bonds ​ ​ ​ ​ 1,970 ​ ​ ​ ​ ​ (28 ) ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ 1,970 ​ ​ ​ ​ ​ (28 ) ​ ​ Government-sponsored mortgage backed securities ​ ​ ​ ​ 768 ​ ​ ​ ​ ​ (4 ) ​ ​ ​ ​ ​ 413 ​ ​ ​ ​ ​ (6 ) ​ ​ ​ ​ ​ 1,181 ​ ​ ​ ​ ​ (10 ) ​ ​ Total investment securities ​ ​ ​ $ 8,350 ​ ​ ​ ​ $ (93 ) ​ ​ ​ ​ $ 2,337 ​ ​ ​ ​ $ (368 ) ​ ​ ​ ​ $ 10,687 ​ ​ ​ ​ $ (461 ) ​ ​ ​

Loans Receivable and Allowanc35

Loans Receivable and Allowance for Loan Losses (Tables)	12 Months Ended
	Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable, Gross, Allowance, and Net [Abstract]
Schedule of summary of the loan portfolio	​ ​ ​ December 31, 2016 ​ ​ December 31, 2015 ​ ​ ​ ​ Originated ​ ​ Acquired ​ ​ Total ​ ​ Originated ​ ​ Acquired ​ ​ Total ​ ​ ​ ​ (In thousands) ​ Real estate loans: ​ ​ ​ ​ ​ ​ ​ Residential ​ ​ ​ $ 178,549 ​ ​ ​ ​ $ 2,761 ​ ​ ​ ​ $ 181,310 ​ ​ ​ ​ $ 174,311 ​ ​ ​ ​ $ 2,873 ​ ​ ​ ​ $ 177,184 ​ ​ Commercial ​ ​ ​ ​ 802,156 ​ ​ ​ ​ ​ 43,166 ​ ​ ​ ​ ​ 845,322 ​ ​ ​ ​ ​ 643,524 ​ ​ ​ ​ ​ 54,018 ​ ​ ​ ​ ​ 697,542 ​ ​ Construction ​ ​ ​ ​ 107,329 ​ ​ ​ ​ ​ 112 ​ ​ ​ ​ ​ 107,441 ​ ​ ​ ​ ​ 81,242 ​ ​ ​ ​ ​ 1,031 ​ ​ ​ ​ ​ 82,273 ​ ​ Home equity ​ ​ ​ ​ 8,549 ​ ​ ​ ​ ​ 5,870 ​ ​ ​ ​ ​ 14,419 ​ ​ ​ ​ ​ 9,146 ​ ​ ​ ​ ​ 6,780 ​ ​ ​ ​ ​ 15,926 ​ ​ ​ ​ ​ ​ ​ 1,096,583 ​ ​ ​ ​ ​ 51,909 ​ ​ ​ ​ ​ 1,148,492 ​ ​ ​ ​ ​ 908,223 ​ ​ ​ ​ ​ 64,702 ​ ​ ​ ​ ​ 972,925 ​ ​ Commercial business ​ ​ ​ ​ 198,456 ​ ​ ​ ​ ​ 17,458 ​ ​ ​ ​ ​ 215,914 ​ ​ ​ ​ ​ 150,479 ​ ​ ​ ​ ​ 22,374 ​ ​ ​ ​ ​ 172,853 ​ ​ Consumer ​ ​ ​ ​ 672 ​ ​ ​ ​ ​ 861 ​ ​ ​ ​ ​ 1,533 ​ ​ ​ ​ ​ 117 ​ ​ ​ ​ ​ 1,618 ​ ​ ​ ​ ​ 1,735 ​ ​ Total loans ​ ​ ​ ​ 1,295,711 ​ ​ ​ ​ ​ 70,228 ​ ​ ​ ​ ​ 1,365,939 ​ ​ ​ ​ ​ 1,058,819 ​ ​ ​ ​ ​ 88,694 ​ ​ ​ ​ ​ 1,147,513 ​ ​ Allowance for loan losses ​ ​ ​ ​ (17,883 ) ​ ​ ​ ​ ​ (99 ) ​ ​ ​ ​ ​ (17,982 ) ​ ​ ​ ​ ​ (14,128 ) ​ ​ ​ ​ ​ (41 ) ​ ​ ​ ​ ​ (14,169 ) ​ ​ Deferred loan origination fees, net ​ ​ ​ ​ (4,071 ) ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ (4,071 ) ​ ​ ​ ​ ​ (3,605 ) ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ (3,605 ) ​ ​ Unamortized loan premiums ​ ​ ​ ​ 9 ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ 9 ​ ​ ​ ​ ​ 9 ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ 9 ​ ​ Loans receivable, net ​ ​ ​ $ 1,273,766 ​ ​ ​ ​ $ 70,129 ​ ​ ​ ​ $ 1,343,895 ​ ​ ​ ​ $ 1,041,095 ​ ​ ​ ​ $ 88,653 ​ ​ ​ ​ $ 1,129,748 ​ ​ ​
Schedule of activity in the accretable yields for the acquired loan portfolio	​ ​ ​ 2016 ​ ​ 2015 ​ ​ ​ ​ (In thousands) ​ Balance at beginning of period ​ ​ ​ $ 871 ​ ​ ​ ​ $ 1,382 ​ ​ Acquisition ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ Accretion ​ ​ ​ ​ (154 ) ​ ​ ​ ​ ​ (157 ) ​ ​ Other (a) ​ ​ ​ ​ (51 ) ​ ​ ​ ​ ​ (354 ) ​ ​ Balance at end of period ​ ​ ​ $ 666 ​ ​ ​ ​ $ 871 ​ ​ ​ ​ (a) Represents changes in cash flows expected to be collected due to loan sales or payoffs.
Schedule of allowance for loan losses	​ ​ ​ Residential ​ ​ Commercial ​ ​ Construction ​ ​ Home Equity ​ ​ Commercial ​ ​ Consumer ​ ​ Total ​ ​ ​ ​ (In thousands) ​ December 31, 2016 ​ ​ ​ ​ ​ ​ ​ ​ Originated ​ ​ ​ ​ ​ ​ ​ ​ Beginning balance ​ ​ ​ $ 1,444 ​ ​ ​ ​ $ 7,693 ​ ​ ​ ​ $ 1,504 ​ ​ ​ ​ $ 174 ​ ​ ​ ​ $ 3,310 ​ ​ ​ ​ $ 3 ​ ​ ​ ​ $ 14,128 ​ ​ Charge-offs ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ (59 ) ​ ​ ​ ​ ​ (10 ) ​ ​ ​ ​ ​ (69 ) ​ ​ Recoveries ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ 8 ​ ​ ​ ​ ​ 8 ​ ​ Provisions ​ ​ ​ ​ 202 ​ ​ ​ ​ ​ 1,693 ​ ​ ​ ​ ​ 601 ​ ​ ​ ​ ​ (18 ) ​ ​ ​ ​ ​ 989 ​ ​ ​ ​ ​ 349 ​ ​ ​ ​ ​ 3,816 ​ ​ Ending balance ​ ​ ​ $ 1,646 ​ ​ ​ ​ $ 9,386 ​ ​ ​ ​ $ 2,105 ​ ​ ​ ​ $ 156 ​ ​ ​ ​ $ 4,240 ​ ​ ​ ​ $ 350 ​ ​ ​ ​ $ 17,883 ​ ​ Acquired ​ ​ ​ ​ ​ ​ ​ ​ Beginning balance ​ ​ ​ $ — ​ ​ ​ ​ $ 12 ​ ​ ​ ​ $ — ​ ​ ​ ​ $ — ​ ​ ​ ​ $ 24 ​ ​ ​ ​ $ 5 ​ ​ ​ ​ $ 41 ​ ​ Charge-offs ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ (7 ) ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ (10 ) ​ ​ ​ ​ ​ (25 ) ​ ​ ​ ​ ​ (42 ) ​ ​ Recoveries ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ 2 ​ ​ ​ ​ ​ 2 ​ ​ Provisions ​ ​ ​ ​ — ​ ​ ​ ​ ​ 17 ​ ​ ​ ​ ​ 7 ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ 29 ​ ​ ​ ​ ​ 45 ​ ​ ​ ​ ​ 98 ​ ​ Ending balance ​ ​ ​ $ — ​ ​ ​ ​ $ 29 ​ ​ ​ ​ $ — ​ ​ ​ ​ $ — ​ ​ ​ ​ $ 43 ​ ​ ​ ​ $ 27 ​ ​ ​ ​ $ 99 ​ ​ Total ​ ​ ​ ​ ​ ​ ​ ​ Beginning balance ​ ​ ​ $ 1,444 ​ ​ ​ ​ $ 7,705 ​ ​ ​ ​ $ 1,504 ​ ​ ​ ​ $ 174 ​ ​ ​ ​ $ 3,334 ​ ​ ​ ​ $ 8 ​ ​ ​ ​ $ 14,169 ​ ​ Charge-offs ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ (7 ) ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ (69 ) ​ ​ ​ ​ ​ (35 ) ​ ​ ​ ​ ​ (111 ) ​ ​ Recoveries ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ 10 ​ ​ ​ ​ ​ 10 ​ ​ Provisions ​ ​ ​ ​ 202 ​ ​ ​ ​ ​ 1,710 ​ ​ ​ ​ ​ 608 ​ ​ ​ ​ ​ (18 ) ​ ​ ​ ​ ​ 1,018 ​ ​ ​ ​ ​ 394 ​ ​ ​ ​ ​ 3,914 ​ ​ Ending balance ​ ​ ​ $ 1,646 ​ ​ ​ ​ $ 9,415 ​ ​ ​ ​ $ 2,105 ​ ​ ​ ​ $ 156 ​ ​ ​ ​ $ 4,283 ​ ​ ​ ​ $ 377 ​ ​ ​ ​ $ 17,982 ​ ​ ​ ​ ​ ​ Residential ​ ​ Commercial ​ ​ Construction ​ ​ Home Equity ​ ​ Commercial ​ ​ Consumer ​ ​ Total ​ ​ ​ ​ (In thousands) ​ December 31, 2015 ​ ​ ​ ​ ​ ​ ​ ​ Originated ​ ​ ​ ​ ​ ​ ​ ​ Beginning balance ​ ​ ​ $ 1,431 ​ ​ ​ ​ $ 5,480 ​ ​ ​ ​ $ 1,102 ​ ​ ​ ​ $ 205 ​ ​ ​ ​ $ 2,638 ​ ​ ​ ​ $ 4 ​ ​ ​ ​ $ 10,860 ​ ​ Charge-offs ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ (6 ) ​ ​ ​ ​ ​ (6 ) ​ ​ Recoveries ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ 7 ​ ​ ​ ​ ​ 7 ​ ​ Provisions ​ ​ ​ ​ 13 ​ ​ ​ ​ ​ 2,213 ​ ​ ​ ​ ​ 402 ​ ​ ​ ​ ​ (31 ) ​ ​ ​ ​ ​ 672 ​ ​ ​ ​ ​ (2 ) ​ ​ ​ ​ ​ 3,267 ​ ​ Ending balance ​ ​ ​ $ 1,444 ​ ​ ​ ​ $ 7,693 ​ ​ ​ ​ $ 1,504 ​ ​ ​ ​ $ 174 ​ ​ ​ ​ $ 3,310 ​ ​ ​ ​ $ 3 ​ ​ ​ ​ $ 14,128 ​ ​ Acquired ​ ​ ​ ​ ​ ​ ​ ​ Beginning balance ​ ​ ​ $ — ​ ​ ​ ​ $ — ​ ​ ​ ​ $ — ​ ​ ​ ​ $ — ​ ​ ​ ​ $ — ​ ​ ​ ​ $ — ​ ​ ​ ​ $ — ​ ​ Charge-offs ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ (15 ) ​ ​ ​ ​ ​ (9 ) ​ ​ ​ ​ ​ (24 ) ​ ​ Recoveries ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ 100 ​ ​ ​ ​ ​ 2 ​ ​ ​ ​ ​ 102 ​ ​ Provisions ​ ​ ​ ​ — ​ ​ ​ ​ ​ 12 ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ (61 ) ​ ​ ​ ​ ​ 12 ​ ​ ​ ​ ​ (37 ) ​ ​ Ending balance ​ ​ ​ $ — ​ ​ ​ ​ $ 12 ​ ​ ​ ​ $ — ​ ​ ​ ​ $ — ​ ​ ​ ​ $ 24 ​ ​ ​ ​ $ 5 ​ ​ ​ ​ $ 41 ​ ​ Total ​ ​ ​ ​ ​ ​ ​ ​ Beginning balance ​ ​ ​ $ 1,431 ​ ​ ​ ​ $ 5,480 ​ ​ ​ ​ $ 1,102 ​ ​ ​ ​ $ 205 ​ ​ ​ ​ $ 2,638 ​ ​ ​ ​ $ 4 ​ ​ ​ ​ $ 10,860 ​ ​ Charge-offs ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ (15 ) ​ ​ ​ ​ ​ (15 ) ​ ​ ​ ​ ​ (30 ) ​ ​ Recoveries ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ 100 ​ ​ ​ ​ ​ 9 ​ ​ ​ ​ ​ 109 ​ ​ Provisions ​ ​ ​ ​ 13 ​ ​ ​ ​ ​ 2,225 ​ ​ ​ ​ ​ 402 ​ ​ ​ ​ ​ (31 ) ​ ​ ​ ​ ​ 611 ​ ​ ​ ​ ​ 10 ​ ​ ​ ​ ​ 3,230 ​ ​ Ending balance ​ ​ ​ $ 1,444 ​ ​ ​ ​ $ 7,705 ​ ​ ​ ​ $ 1,504 ​ ​ ​ ​ $ 174 ​ ​ ​ ​ $ 3,334 ​ ​ ​ ​ $ 8 ​ ​ ​ ​ $ 14,169 ​ ​ ​ ​ ​ ​ Residential ​ ​ Commercial ​ ​ Construction ​ ​ Home Equity ​ ​ Commercial ​ ​ Consumer ​ ​ Total ​ ​ ​ ​ (In thousands) ​ December 31, 2014 ​ ​ ​ ​ ​ ​ ​ ​ Originated ​ ​ ​ ​ ​ ​ ​ ​ Beginning balance ​ ​ ​ $ 1,310 ​ ​ ​ ​ $ 3,616 ​ ​ ​ ​ $ 1,032 ​ ​ ​ ​ $ 190 ​ ​ ​ ​ $ 2,225 ​ ​ ​ ​ $ 9 ​ ​ ​ ​ $ 8,382 ​ ​ Charge-offs ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ (3 ) ​ ​ ​ ​ ​ (3 ) ​ ​ Recoveries ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ 4 ​ ​ ​ ​ ​ 425 ​ ​ ​ ​ ​ 429 ​ ​ Provisions ​ ​ ​ ​ 121 ​ ​ ​ ​ ​ 1,864 ​ ​ ​ ​ ​ 70 ​ ​ ​ ​ ​ 15 ​ ​ ​ ​ ​ 409 ​ ​ ​ ​ ​ (427 ) ​ ​ ​ ​ ​ 2,052 ​ ​ Ending balance ​ ​ ​ $ 1,431 ​ ​ ​ ​ $ 5,480 ​ ​ ​ ​ $ 1,102 ​ ​ ​ ​ $ 205 ​ ​ ​ ​ $ 2,638 ​ ​ ​ ​ $ 4 ​ ​ ​ ​ $ 10,860 ​ ​ Acquired ​ ​ ​ ​ ​ ​ ​ ​ Beginning balance ​ ​ ​ $ — ​ ​ ​ ​ $ — ​ ​ ​ ​ $ — ​ ​ ​ ​ $ — ​ ​ ​ ​ $ — ​ ​ ​ ​ $ — ​ ​ ​ ​ $ — ​ ​ Charge-offs ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ (100 ) ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ (100 ) ​ ​ Recoveries ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ Provisions ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ 100 ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ 100 ​ ​ Ending balance ​ ​ ​ $ — ​ ​ ​ ​ $ — ​ ​ ​ ​ $ — ​ ​ ​ ​ $ — ​ ​ ​ ​ $ — ​ ​ ​ ​ $ — ​ ​ ​ ​ $ — ​ ​ Total ​ ​ ​ ​ ​ ​ ​ ​ Beginning balance ​ ​ ​ $ 1,310 ​ ​ ​ ​ $ 3,616 ​ ​ ​ ​ $ 1,032 ​ ​ ​ ​ $ 190 ​ ​ ​ ​ $ 2,225 ​ ​ ​ ​ $ 9 ​ ​ ​ ​ $ 8,382 ​ ​ Charge-offs ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ (100 ) ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ (3 ) ​ ​ ​ ​ ​ (103 ) ​ ​ Recoveries ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ 4 ​ ​ ​ ​ ​ 425 ​ ​ ​ ​ ​ 429 ​ ​ Provisions ​ ​ ​ ​ 121 ​ ​ ​ ​ ​ 1,864 ​ ​ ​ ​ ​ 170 ​ ​ ​ ​ ​ 15 ​ ​ ​ ​ ​ 409 ​ ​ ​ ​ ​ (427 ) ​ ​ ​ ​ ​ 2,152 ​ ​ Ending balance ​ ​ ​ $ 1,431 ​ ​ ​ ​ $ 5,480 ​ ​ ​ ​ $ 1,102 ​ ​ ​ ​ $ 205 ​ ​ ​ ​ $ 2,638 ​ ​ ​ ​ $ 4 ​ ​ ​ ​ $ 10,860 ​ ​ ​
Schedule of portfolio segment and impairment methodology, of the allowance for loan losses and related portfolio	Originated Loans Acquired Loans Total Portfolio Allowance Portfolio Allowance Portfolio Allowance (In thousands) December 31, 2016 Loans individually evaluated for impairment: Residential real estate $ 969 $ — $ — $ — $ 969 $ — Commercial real estate 774 1 144 7 918 8 Home equity 259 — 453 — 712 — Commercial business 920 5 962 37 1,882 42 Consumer 341 341 27 27 368 368 Subtotal 3,263 347 1,586 71 4,849 418 Loans collectively evaluated for impairment: Residential real estate 177,580 1,646 2,761 — 180,341 1,646 Commercial real estate 801,382 9,385 43,022 22 844,404 9,407 Construction 107,329 2,105 112 — 107,441 2,105 Home equity 8,290 156 5,417 — 13,707 156 Commercial business 197,536 4,235 16,496 6 214,032 4,241 Consumer 331 9 834 — 1,165 9 Subtotal 1,292,448 17,536 68,642 28 1,361,090 17,564 Total $ 1,295,711 $ 17,883 $ 70,228 $ 99 $ 1,365,939 $ 17,982 Originated Loans Acquired Loans Total Portfolio Allowance Portfolio Allowance Portfolio Allowance (In thousands) December 31, 2015 Loans individually evaluated for impairment: Residential real estate $ 1,833 $ 2 $ — $ — $ 1,833 $ 2 Commercial real estate 4,291 — 762 12 5,053 12 Home equity 422 — 197 — 619 — Commercial business 1,977 71 1,433 21 3,410 92 Consumer — — 7 5 7 5 Subtotal 8,523 73 2,399 38 10,922 111 Loans collectively evaluated for impairment: Residential real estate 172,478 1,442 2,873 — 175,351 1,442 Commercial real estate 639,233 7,692 53,256 — 692,489 7,692 Construction 81,242 1,504 1,031 — 82,273 1,504 Home equity 8,724 174 6,583 — 15,307 174 Commercial business 148,502 3,239 20,941 3 169,443 3,242 Consumer 117 4 1,611 — 1,728 4 Subtotal 1,050,296 14,055 86,295 3 1,136,591 14,058 Total $ 1,058,819 $ 14,128 $ 88,694 $ 41 $ 1,147,513 $ 14,169
Schedule of loan portfolio quality indicators by portfolio segment	​ ​ ​ Commercial Credit Quality Indicators ​ ​ ​ ​ At December 31, 2016 ​ ​ At December 31, 2015 ​ ​ ​ ​ Commercial ​ ​ Construction ​ ​ Commercial ​ ​ Total ​ ​ Commercial ​ ​ Construction ​ ​ Commercial ​ ​ Total ​ ​ ​ ​ (In thousands) ​ Originated loans: ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ ​ ​ $ 797,249 ​ ​ ​ ​ $ 107,329 ​ ​ ​ ​ $ 196,436 ​ ​ ​ ​ $ 1,101,014 ​ ​ ​ ​ $ 638,709 ​ ​ ​ ​ $ 81,242 ​ ​ ​ ​ $ 148,748 ​ ​ ​ ​ $ 868,699 ​ ​ Special mention ​ ​ ​ ​ 4,605 ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ 115 ​ ​ ​ ​ ​ 4,720 ​ ​ ​ ​ ​ 1,595 ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ 1,118 ​ ​ ​ ​ ​ 2,713 ​ ​ Substandard ​ ​ ​ ​ 302 ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ 1,905 ​ ​ ​ ​ ​ 2,207 ​ ​ ​ ​ ​ 3,220 ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ 549 ​ ​ ​ ​ ​ 3,769 ​ ​ Doubtful ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ Loss ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ 64 ​ ​ ​ ​ ​ 64 ​ ​ Total originated loans ​ ​ ​ ​ 802,156 ​ ​ ​ ​ ​ 107,329 ​ ​ ​ ​ ​ 198,456 ​ ​ ​ ​ ​ 1,107,941 ​ ​ ​ ​ ​ 643,524 ​ ​ ​ ​ ​ 81,242 ​ ​ ​ ​ ​ 150,479 ​ ​ ​ ​ ​ 875,245 ​ ​ Acquired loans: ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ ​ ​ ​ 41,582 ​ ​ ​ ​ ​ 112 ​ ​ ​ ​ ​ 16,836 ​ ​ ​ ​ ​ 58,530 ​ ​ ​ ​ ​ 52,427 ​ ​ ​ ​ ​ 230 ​ ​ ​ ​ ​ 20,794 ​ ​ ​ ​ ​ 73,451 ​ ​ Special mention ​ ​ ​ ​ 1,584 ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ 86 ​ ​ ​ ​ ​ 1,670 ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ 598 ​ ​ ​ ​ ​ 598 ​ ​ Substandard ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ 536 ​ ​ ​ ​ ​ 536 ​ ​ ​ ​ ​ 1,591 ​ ​ ​ ​ ​ 801 ​ ​ ​ ​ ​ 982 ​ ​ ​ ​ ​ 3,374 ​ ​ Doubtful ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ Loss ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ Total acquired loans ​ ​ ​ ​ 43,166 ​ ​ ​ ​ ​ 112 ​ ​ ​ ​ ​ 17,458 ​ ​ ​ ​ ​ 60,736 ​ ​ ​ ​ ​ 54,018 ​ ​ ​ ​ ​ 1,031 ​ ​ ​ ​ ​ 22,374 ​ ​ ​ ​ ​ 77,423 ​ ​ Total loans: ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ ​ ​ ​ 838,831 ​ ​ ​ ​ ​ 107,441 ​ ​ ​ ​ ​ 213,272 ​ ​ ​ ​ ​ 1,159,544 ​ ​ ​ ​ ​ 691,136 ​ ​ ​ ​ ​ 81,472 ​ ​ ​ ​ ​ 169,542 ​ ​ ​ ​ ​ 942,150 ​ ​ Special mention ​ ​ ​ ​ 6,189 ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ 201 ​ ​ ​ ​ ​ 6,390 ​ ​ ​ ​ ​ 1,595 ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ 1,716 ​ ​ ​ ​ ​ 3,311 ​ ​ Substandard ​ ​ ​ ​ 302 ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ 2,441 ​ ​ ​ ​ ​ 2,743 ​ ​ ​ ​ ​ 4,811 ​ ​ ​ ​ ​ 801 ​ ​ ​ ​ ​ 1,531 ​ ​ ​ ​ ​ 7,143 ​ ​ Doubtful ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ Loss ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ 64 ​ ​ ​ ​ ​ 64 ​ ​ Total loans ​ ​ ​ $ 845,322 ​ ​ ​ ​ $ 107,441 ​ ​ ​ ​ $ 215,914 ​ ​ ​ ​ $ 1,168,677 ​ ​ ​ ​ $ 697,542 ​ ​ ​ ​ $ 82,273 ​ ​ ​ ​ $ 172,853 ​ ​ ​ ​ $ 952,668 ​ ​ ​ ​ ​ ​ Residential and Consumer Credit Quality Indicators ​ ​ ​ ​ At December 31, 2016 ​ ​ At December 31, 2015 ​ ​ ​ ​ Residential ​ ​ Home Equity ​ ​ Consumer ​ ​ Total ​ ​ Residential ​ ​ Home Equity ​ ​ Consumer ​ ​ Total ​ ​ ​ ​ (In thousands) ​ Originated loans: ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ ​ ​ $ 176,961 ​ ​ ​ ​ $ 8,291 ​ ​ ​ ​ $ 331 ​ ​ ​ ​ $ 185,583 ​ ​ ​ ​ $ 172,478 ​ ​ ​ ​ $ 8,725 ​ ​ ​ ​ $ 117 ​ ​ ​ ​ $ 181,320 ​ ​ Special mention ​ ​ ​ ​ 147 ​ ​ ​ ​ ​ 69 ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ 216 ​ ​ ​ ​ ​ 864 ​ ​ ​ ​ ​ 80 ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ 944 ​ ​ Substandard ​ ​ ​ ​ 1,441 ​ ​ ​ ​ ​ 189 ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ 1,630 ​ ​ ​ ​ ​ 969 ​ ​ ​ ​ ​ 341 ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ 1,310 ​ ​ Doubtful ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ Loss ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ 341 ​ ​ ​ ​ ​ 341 ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ Total originated loans ​ ​ ​ ​ 178,549 ​ ​ ​ ​ ​ 8,549 ​ ​ ​ ​ ​ 672 ​ ​ ​ ​ ​ 187,770 ​ ​ ​ ​ ​ 174,311 ​ ​ ​ ​ ​ 9,146 ​ ​ ​ ​ ​ 117 ​ ​ ​ ​ ​ 183,574 ​ ​ Acquired loans: ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ ​ ​ ​ 2,229 ​ ​ ​ ​ ​ 5,417 ​ ​ ​ ​ ​ 835 ​ ​ ​ ​ ​ 8,481 ​ ​ ​ ​ ​ 2,873 ​ ​ ​ ​ ​ 6,545 ​ ​ ​ ​ ​ 1,539 ​ ​ ​ ​ ​ 10,957 ​ ​ Special mention ​ ​ ​ ​ 49 ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ 49 ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ Substandard ​ ​ ​ ​ 483 ​ ​ ​ ​ ​ 453 ​ ​ ​ ​ ​ 2 ​ ​ ​ ​ ​ 938 ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ 235 ​ ​ ​ ​ ​ 79 ​ ​ ​ ​ ​ 314 ​ ​ Doubtful ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ Loss ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ 24 ​ ​ ​ ​ ​ 24 ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ Total acquired loans ​ ​ ​ ​ 2,761 ​ ​ ​ ​ ​ 5,870 ​ ​ ​ ​ ​ 861 ​ ​ ​ ​ ​ 9,492 ​ ​ ​ ​ ​ 2,873 ​ ​ ​ ​ ​ 6,780 ​ ​ ​ ​ ​ 1,618 ​ ​ ​ ​ ​ 11,271 ​ ​ Total loans: ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ ​ ​ ​ 179,190 ​ ​ ​ ​ ​ 13,708 ​ ​ ​ ​ ​ 1,166 ​ ​ ​ ​ ​ 194,064 ​ ​ ​ ​ ​ 175,351 ​ ​ ​ ​ ​ 15,270 ​ ​ ​ ​ ​ 1,656 ​ ​ ​ ​ ​ 192,277 ​ ​ Special mention ​ ​ ​ ​ 196 ​ ​ ​ ​ ​ 69 ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ 265 ​ ​ ​ ​ ​ 864 ​ ​ ​ ​ ​ 80 ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ 944 ​ ​ Substandard ​ ​ ​ ​ 1,924 ​ ​ ​ ​ ​ 642 ​ ​ ​ ​ ​ 2 ​ ​ ​ ​ ​ 2,568 ​ ​ ​ ​ ​ 969 ​ ​ ​ ​ ​ 576 ​ ​ ​ ​ ​ 79 ​ ​ ​ ​ ​ 1,624 ​ ​ Doubtful ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ Loss ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ 365 ​ ​ ​ ​ ​ 365 ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ Total loans ​ ​ ​ $ 181,310 ​ ​ ​ ​ $ 14,419 ​ ​ ​ ​ $ 1,533 ​ ​ ​ ​ $ 197,262 ​ ​ ​ ​ $ 177,184 ​ ​ ​ ​ $ 15,926 ​ ​ ​ ​ $ 1,735 ​ ​ ​ ​ $ 194,845 ​ ​ ​
Schedule of information with respect to our loan portfolio delinquencies by portfolio segment and amount	​ ​ ​ As of December 31, 2016 ​ ​ ​ ​ 31 – 60 Days ​ ​ 61 – 90 Days ​ ​ Greater Than ​ ​ Total Past ​ ​ Current ​ ​ Total Loans ​ ​ ​ ​ (In thousands) ​ Originated Loans ​ ​ ​ ​ ​ ​ ​ Real estate loans: ​ ​ ​ ​ ​ ​ ​ Residential real estate ​ ​ ​ $ — ​ ​ ​ ​ $ — ​ ​ ​ ​ $ 969 ​ ​ ​ ​ $ 969 ​ ​ ​ ​ $ 177,580 ​ ​ ​ ​ $ 178,549 ​ ​ Commercial real estate ​ ​ ​ ​ 147 ​ ​ ​ ​ ​ 1,848 ​ ​ ​ ​ ​ 302 ​ ​ ​ ​ ​ 2,297 ​ ​ ​ ​ ​ 799,859 ​ ​ ​ ​ ​ 802,156 ​ ​ Construction ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ 107,329 ​ ​ ​ ​ ​ 107,329 ​ ​ Home equity ​ ​ ​ ​ — ​ ​ ​ ​ ​ 173 ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ 173 ​ ​ ​ ​ ​ 8,376 ​ ​ ​ ​ ​ 8,549 ​ ​ Commercial business ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ 378 ​ ​ ​ ​ ​ 378 ​ ​ ​ ​ ​ 198,078 ​ ​ ​ ​ ​ 198,456 ​ ​ Consumer ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ 672 ​ ​ ​ ​ ​ 672 ​ ​ Total originated loans ​ ​ ​ ​ 147 ​ ​ ​ ​ ​ 2,021 ​ ​ ​ ​ ​ 1,649 ​ ​ ​ ​ ​ 3,817 ​ ​ ​ ​ ​ 1,291,894 ​ ​ ​ ​ ​ 1,295,711 ​ ​ Acquired Loans ​ ​ ​ ​ ​ ​ ​ Real estate loans: ​ ​ ​ ​ ​ ​ ​ Residential real estate ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ 2,761 ​ ​ ​ ​ ​ 2,761 ​ ​ Commercial real estate ​ ​ ​ ​ 866 ​ ​ ​ ​ ​ 722 ​ ​ ​ ​ ​ 143 ​ ​ ​ ​ ​ 1,731 ​ ​ ​ ​ ​ 41,435 ​ ​ ​ ​ ​ 43,166 ​ ​ Construction ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ 112 ​ ​ ​ ​ ​ 112 ​ ​ Home equity ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ 453 ​ ​ ​ ​ ​ 453 ​ ​ ​ ​ ​ 5,417 ​ ​ ​ ​ ​ 5,870 ​ ​ Commercial business ​ ​ ​ ​ 99 ​ ​ ​ ​ ​ 249 ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ 348 ​ ​ ​ ​ ​ 17,110 ​ ​ ​ ​ ​ 17,458 ​ ​ Consumer ​ ​ ​ ​ 6 ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ 6 ​ ​ ​ ​ ​ 855 ​ ​ ​ ​ ​ 861 ​ ​ Total acquired loans ​ ​ ​ ​ 971 ​ ​ ​ ​ ​ 971 ​ ​ ​ ​ ​ 596 ​ ​ ​ ​ ​ 2,538 ​ ​ ​ ​ ​ 67,690 ​ ​ ​ ​ ​ 70,228 ​ ​ Total loans ​ ​ ​ $ 1,118 ​ ​ ​ ​ $ 2,992 ​ ​ ​ ​ $ 2,245 ​ ​ ​ ​ $ 6,355 ​ ​ ​ ​ $ 1,359,584 ​ ​ ​ ​ $ 1,365,939 ​ ​ ​ ​ ​ ​ As of December 31, 2015 ​ ​ ​ ​ 31 – 60 Days ​ ​ 61 – 90 Days ​ ​ Greater Than ​ ​ Total Past ​ ​ Current ​ ​ Total Loans ​ ​ ​ ​ (In thousands) ​ Originated Loans ​ ​ ​ ​ ​ ​ ​ Real estate loans: ​ ​ ​ ​ ​ ​ ​ Residential real estate ​ ​ ​ $ — ​ ​ ​ ​ $ — ​ ​ ​ ​ $ 969 ​ ​ ​ ​ $ 969 ​ ​ ​ ​ $ 173,342 ​ ​ ​ ​ $ 174,311 ​ ​ Commercial real estate ​ ​ ​ ​ — ​ ​ ​ ​ ​ 311 ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ 311 ​ ​ ​ ​ ​ 643,213 ​ ​ ​ ​ ​ 643,524 ​ ​ Construction ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ 81,242 ​ ​ ​ ​ ​ 81,242 ​ ​ Home equity ​ ​ ​ ​ 198 ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ 198 ​ ​ ​ ​ ​ 8,948 ​ ​ ​ ​ ​ 9,146 ​ ​ Commercial business ​ ​ ​ ​ 1,078 ​ ​ ​ ​ ​ 100 ​ ​ ​ ​ ​ 343 ​ ​ ​ ​ ​ 1,521 ​ ​ ​ ​ ​ 148,958 ​ ​ ​ ​ ​ 150,479 ​ ​ Consumer ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ 117 ​ ​ ​ ​ ​ 117 ​ ​ Total originated loans ​ ​ ​ ​ 1,276 ​ ​ ​ ​ ​ 411 ​ ​ ​ ​ ​ 1,312 ​ ​ ​ ​ ​ 2,999 ​ ​ ​ ​ ​ 1,055,820 ​ ​ ​ ​ ​ 1,058,819 ​ ​ Acquired Loans ​ ​ ​ ​ ​ ​ ​ Real estate loans: ​ ​ ​ ​ ​ ​ ​ Residential real estate ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ 2,873 ​ ​ ​ ​ ​ 2,873 ​ ​ Commercial real estate ​ ​ ​ ​ 333 ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ 762 ​ ​ ​ ​ ​ 1,095 ​ ​ ​ ​ ​ 52,923 ​ ​ ​ ​ ​ 54,018 ​ ​ Construction ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ 801 ​ ​ ​ ​ ​ 801 ​ ​ ​ ​ ​ 230 ​ ​ ​ ​ ​ 1,031 ​ ​ Home equity ​ ​ ​ ​ 100 ​ ​ ​ ​ ​ 162 ​ ​ ​ ​ ​ 191 ​ ​ ​ ​ ​ 453 ​ ​ ​ ​ ​ 6,327 ​ ​ ​ ​ ​ 6,780 ​ ​ Commercial business ​ ​ ​ ​ 262 ​ ​ ​ ​ ​ 71 ​ ​ ​ ​ ​ 101 ​ ​ ​ ​ ​ 434 ​ ​ ​ ​ ​ 21,940 ​ ​ ​ ​ ​ 22,374 ​ ​ Consumer ​ ​ ​ ​ 17 ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ 17 ​ ​ ​ ​ ​ 1,601 ​ ​ ​ ​ ​ 1,618 ​ ​ Total acquired loans ​ ​ ​ ​ 712 ​ ​ ​ ​ ​ 233 ​ ​ ​ ​ ​ 1,855 ​ ​ ​ ​ ​ 2,800 ​ ​ ​ ​ ​ 85,894 ​ ​ ​ ​ ​ 88,694 ​ ​ Total loans ​ ​ ​ $ 1,988 ​ ​ ​ ​ $ 644 ​ ​ ​ ​ $ 3,167 ​ ​ ​ ​ $ 5,799 ​ ​ ​ ​ $ 1,141,714 ​ ​ ​ ​ $ 1,147,513 ​ ​ ​
Schedule of nonaccrual loans by portfolio segment	​ ​ ​ December 31, ​ ​ ​ ​ 2016 ​ ​ 2015 ​ ​ ​ ​ (In thousands) ​ Residential real estate ​ ​ ​ $ 969 ​ ​ ​ ​ $ 970 ​ ​ Commercial real estate ​ ​ ​ ​ 446 ​ ​ ​ ​ ​ 1,264 ​ ​ Home equity ​ ​ ​ ​ 643 ​ ​ ​ ​ ​ 395 ​ ​ Commercial business ​ ​ ​ ​ 538 ​ ​ ​ ​ ​ 1,160 ​ ​ Consumer ​ ​ ​ ​ 341 ​ ​ ​ ​ ​ 2 ​ ​ Total ​ ​ ​ $ 2,937 ​ ​ ​ ​ $ 3,791 ​ ​ ​
Schedule of summarizes impaired loans	As of and for the Year Ended December 31, 2016 Carrying Unpaid Associated Average Interest (In thousands) Originated Impaired loans without a valuation allowance: Residential real estate $ 969 $ 969 $ — $ 969 $ — Commercial real estate 651 651 — 668 29 Home equity 259 269 — 267 10 Commercial business 551 584 — 987 76 Total impaired loans without a valuation allowance $ 2,430 $ 2,473 $ — $ 2,891 $ 115 Impaired loans with a valuation allowance: Residential real estate $ — $ — $ — $ — $ — Commercial real estate 123 123 1 128 6 Commercial business 369 369 5 417 22 Consumer 341 341 341 341 — Total impaired loans with a valuation allowance 833 833 347 886 28 Total originated impaired loans $ 3,263 $ 3,306 $ 347 $ 3,777 $ 143 Acquired Impaired loans without a valuation allowance: Home Equity $ 453 $ 462 $ — $ 456 $ 9 Commercial Business 572 593 — 629 36 Total impaired loans without a valuation allowance $ 1,025 $ 1,055 $ — $ 1,085 $ 45 Impaired loans with a valuation allowance: Commercial real estate $ 144 $ 144 $ 7 $ 144 $ — Commercial business 390 390 37 406 19 Consumer 27 27 27 27 — Total impaired loans with a valuation allowance 561 561 71 577 19 Total acquired impaired loans $ 1,586 $ 1,616 $ 71 $ 1,662 $ 64 As of and for the Year Ended December 31, 2015 Carrying Unpaid Associated Average Interest (In thousands) Originated Impaired loans without a valuation allowance: Residential real estate $ 969 $ 969 $ — $ 973 $ 27 Commercial real estate 4,291 4,291 — 4,308 124 Home equity 422 424 — 429 10 Commercial business 1,351 1,372 — 1,374 49 Total impaired loans without a valuation allowance $ 7,033 $ 7,056 $ — $ 7,084 $ 210 Impaired loans with a valuation allowance: Residential real estate $ 864 $ 864 $ 2 $ 864 $ 28 Commercial business 626 690 71 673 34 Total impaired loans with a valuation allowance 1,490 1,554 73 1,537 62 Total originated impaired loans $ 8,523 $ 8,610 $ 73 $ 8,621 $ 272 Acquired Impaired loans without a valuation allowance: Commercial real estate $ 611 $ 678 $ — $ 602 $ 6 Home Equity 197 200 — 198 2 Commercial Business 963 963 — 999 54 Total impaired loans without a valuation allowance $ 1,771 $ 1,841 $ — $ 1,799 $ 62 Impaired loans with a valuation allowance: Commercial real estate $ 151 $ 151 $ 12 $ 151 $ 3 Commercial business 470 480 21 506 14 Consumer 7 7 5 7 1 Total impaired loans with a valuation allowance 628 638 38 664 18 Total acquired impaired loans $ 2,399 $ 2,479 $ 38 $ 2,463 $ 80 As of and for the Year Ended December 31, 2014 Carrying Unpaid Associated Average Interest (In thousands) Originated Impaired loans without a valuation allowance: Residential real estate $ 864 $ 864 $ — $ 864 $ 28 Commercial real estate 4,543 4,544 — 4,034 223 Home equity 91 91 — 95 3 Commercial business 1,145 1,153 — 1,226 52 Total impaired loans without a valuation allowance $ 6,643 $ 6,652 $ — $ 6,219 $ 306 Impaired loans with a valuation allowance: Commercial real estate $ 453 $ 453 $ 23 $ 457 $ 29 Commercial business 556 556 10 596 32 Total impaired loans with a valuation allowance $ 1,009 $ 1,009 $ 33 $ 1,053 $ 61 Total originated impaired loans $ 7,652 $ 7,661 $ 33 $ 7,272 $ 367 Acquired Impaired loans without a valuation allowance: Commercial business $ 629 $ 629 $ — $ 607 $ 28 Total impaired loans without a valuation allowance $ 629 $ 629 $ — $ 607 $ 28 Impaired loans with a valuation allowance: Total impaired loans with a valuation allowance $ — $ — $ — $ — $ — Total acquired impaired loans $ 629 $ 629 $ — $ 607 $ 28
Schedule of loans whose terms were modified as TDRs during the periods	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Outstanding Recorded Investment ​ ​ ​ ​ Number of Loans ​ ​ Pre-Modification ​ ​ Post-Modification ​ ​ ​ ​ 2016 ​ ​ 2015 ​ ​ 2014 ​ ​ 2016 ​ ​ 2015 ​ ​ 2014 ​ ​ 2016 ​ ​ 2015 ​ ​ 2014 ​ ​ ​ ​ (Dollars in thousands) ​ Years ended December 31, ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Commercial real estate ​ ​ ​ ​ 1 ​ ​ ​ ​ ​ 3 ​ ​ ​ ​ ​ 2 ​ ​ ​ ​ $ 62 ​ ​ ​ ​ $ 4,044 ​ ​ ​ ​ $ 1,317 ​ ​ ​ ​ $ 62 ​ ​ ​ ​ $ 4,044 ​ ​ ​ ​ $ 1,317 ​ ​ Commercial business ​ ​ ​ ​ 2 ​ ​ ​ ​ ​ 1 ​ ​ ​ ​ ​ 4 ​ ​ ​ ​ ​ 237 ​ ​ ​ ​ ​ 39 ​ ​ ​ ​ ​ 782 ​ ​ ​ ​ ​ 237 ​ ​ ​ ​ ​ 39 ​ ​ ​ ​ ​ 782 ​ ​ Total ​ ​ ​ ​ 3 ​ ​ ​ ​ ​ 4 ​ ​ ​ ​ ​ 6 ​ ​ ​ ​ $ 299 ​ ​ ​ ​ $ 4,083 ​ ​ ​ ​ $ 2,099 ​ ​ ​ ​ $ 299 ​ ​ ​ ​ $ 4,083 ​ ​ ​ ​ $ 2,099 ​ ​ ​
Schedule of information on how loans were modified as a TDR	​ ​ ​ December 31, ​ ​ ​ ​ 2016 ​ ​ 2015 ​ ​ 2014 ​ ​ ​ ​ (In thousands) ​ Maturity Concession ​ ​ ​ $ 299 ​ ​ ​ ​ $ — ​ ​ ​ ​ $ — ​ ​ Maturity/amortization concession ​ ​ ​ ​ — ​ ​ ​ ​ ​ 825 ​ ​ ​ ​ ​ 946 ​ ​ Maturity and payment concession ​ ​ ​ ​ — ​ ​ ​ ​ ​ 3,258 ​ ​ ​ ​ ​ — ​ ​ Payment concession ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ 1,153 ​ ​ Total ​ ​ ​ $ 299 ​ ​ ​ ​ $ 4,083 ​ ​ ​ ​ $ 2,099 ​ ​ ​

Premises and equipment (Tables)

Premises and equipment (Tables)	12 Months Ended
	Dec. 31, 2016
Property, Plant and Equipment [Abstract]
Schedule of premises and equipment	​ ​ ​ December 31, ​ ​ ​ ​ 2016 ​ ​ 2015 ​ ​ ​ ​ (In thousands) ​ Land ​ ​ ​ $ 2,300 ​ ​ ​ ​ $ 2,300 ​ ​ Building ​ ​ ​ ​ 14,061 ​ ​ ​ ​ ​ 6,384 ​ ​ Leasehold improvements ​ ​ ​ ​ 4,532 ​ ​ ​ ​ ​ 4,544 ​ ​ Furniture and fixtures ​ ​ ​ ​ 2,118 ​ ​ ​ ​ ​ 1,964 ​ ​ Equipment ​ ​ ​ ​ 4,249 ​ ​ ​ ​ ​ 3,734 ​ ​ Automobiles ​ ​ ​ ​ 67 ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ ​ ​ 27,327 ​ ​ ​ ​ ​ 18,926 ​ ​ Accumulated depreciation and amortization ​ ​ ​ ​ (9,492 ) ​ ​ ​ ​ ​ (7,763 ) ​ ​ Premises and equipment, net ​ ​ ​ $ 17,835 ​ ​ ​ ​ $ 11,163 ​ ​ ​

Deposits (Tables)

Deposits (Tables)	12 Months Ended
	Dec. 31, 2016
Deposits [Abstract]
Schedule of deposits	​ ​ ​ December 31, ​ ​ ​ ​ 2016 ​ ​ 2015 ​ ​ ​ ​ (In thousands) ​ Noninterest bearing demand deposit accounts ​ ​ ​ $ 187,593 ​ ​ ​ ​ $ 164,553 ​ ​ Interest bearing accounts: ​ ​ ​ NOW and money market ​ ​ ​ ​ 402,982 ​ ​ ​ ​ ​ 347,846 ​ ​ Savings ​ ​ ​ ​ 96,601 ​ ​ ​ ​ ​ 97,846 ​ ​ Time certificates of deposit ​ ​ ​ ​ 601,861 ​ ​ ​ ​ ​ 436,697 ​ ​ Total interest bearing accounts ​ ​ ​ ​ 1,101,444 ​ ​ ​ ​ ​ 882,389 ​ ​ Total deposits ​ ​ ​ $ 1,289,037 ​ ​ ​ ​ $ 1,046,942 ​ ​ ​
Schedule of contractual maturities of time certificates of deposit	​ ​ ​ December 31, ​ ​ ​ ​ 2016 ​ ​ 2015 ​ ​ ​ ​ (In thousands) ​ 2016 ​ ​ ​ $ — ​ ​ ​ ​ $ 238,673 ​ ​ 2017 ​ ​ ​ ​ 323,742 ​ ​ ​ ​ ​ 152,682 ​ ​ 2018 ​ ​ ​ ​ 247,517 ​ ​ ​ ​ ​ 35,186 ​ ​ 2019 ​ ​ ​ ​ 29,778 ​ ​ ​ ​ ​ 9,810 ​ ​ 2020 ​ ​ ​ ​ 433 ​ ​ ​ ​ ​ 346 ​ ​ 2021 ​ ​ ​ ​ 391 ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ ​ $ 601,861 ​ ​ ​ ​ $ 436,697 ​ ​ ​
Schedule of interest expense by account type	​ ​ ​ Years Ended December 31, ​ ​ ​ ​ 2016 ​ ​ 2015 ​ ​ 2014 ​ ​ ​ ​ (In thousands) ​ NOW and money market ​ ​ ​ $ 1,945 ​ ​ ​ ​ $ 1,473 ​ ​ ​ ​ $ 894 ​ ​ Savings ​ ​ ​ ​ 315 ​ ​ ​ ​ ​ 693 ​ ​ ​ ​ ​ 302 ​ ​ Time certificates of deposit ​ ​ ​ ​ 6,040 ​ ​ ​ ​ ​ 3,515 ​ ​ ​ ​ ​ 2,099 ​ ​ Total interest expense on deposits ​ ​ ​ $ 8,300 ​ ​ ​ ​ $ 5,681 ​ ​ ​ ​ $ 3,295 ​ ​ ​

Federal Loan Bank Advances an38

Federal Loan Bank Advances and Other Borrowings (Tables)	12 Months Ended
	Dec. 31, 2016
Advances from Federal Home Loan Banks [Abstract]
Schedule of FHLB advances with maturity dates and weighted average rates	​ ​ ​ December 31, ​ ​ ​ ​ 2016 ​ ​ 2015 ​ ​ ​ ​ Amount ​ ​ Weighted ​ ​ Amount ​ ​ Weighted ​ ​ ​ ​ (Dollars in thousands) ​ Year of Maturity: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2016 ​ ​ ​ $ — ​ ​ ​ ​ ​ — % ​ ​ ​ ​ $ 75,000 ​ ​ ​ ​ ​ 0.46 % ​ ​ 2017 ​ ​ ​ ​ 135,000 ​ ​ ​ ​ ​ 0.73 ​ ​ ​ ​ ​ 20,000 ​ ​ ​ ​ ​ 0.99 ​ ​ 2020 ​ ​ ​ ​ 25,000 ​ ​ ​ ​ ​ 1.99 ​ ​ ​ ​ ​ 25,000 ​ ​ ​ ​ ​ 1.99 ​ ​ Total advances ​ ​ ​ $ 160,000 ​ ​ ​ ​ ​ 0.92 % ​ ​ ​ ​ $ 120,000 ​ ​ ​ ​ ​ 0.87 % ​ ​ ​

Commitments and Contingencies (

Commitments and Contingencies (Tables)	12 Months Ended
	Dec. 31, 2016
Commitments and Contingencies Disclosure [Abstract]
Schedule of financial instruments whose contract amounts represented credit risk	​ ​ ​ December 31, ​ ​ ​ ​ 2016 ​ ​ 2015 ​ ​ ​ ​ (In thousands) ​ Commitments to extend credit: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Loan commitments ​ ​ ​ $ 89,825 ​ ​ ​ ​ $ 77,181 ​ ​ Undisbursed construction loans ​ ​ ​ ​ 70,526 ​ ​ ​ ​ ​ 66,974 ​ ​ Unused home equity lines of credit ​ ​ ​ ​ 8,083 ​ ​ ​ ​ ​ 9,258 ​ ​ ​ ​ ​ ​ $ 168,434 ​ ​ ​ ​ $ 153,413 ​ ​ ​

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Schedule of income tax expense	​ ​ ​ 2016 ​ ​ 2015 ​ ​ 2014 ​ ​ ​ ​ (In thousands) ​ Current provision: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Federal ​ ​ ​ $ 6,838 ​ ​ ​ ​ $ 5,113 ​ ​ ​ ​ $ 2,147 ​ ​ State ​ ​ ​ ​ 226 ​ ​ ​ ​ ​ 694 ​ ​ ​ ​ ​ 718 ​ ​ Total current ​ ​ ​ ​ 7,064 ​ ​ ​ ​ ​ 5,807 ​ ​ ​ ​ ​ 2,865 ​ ​ Deferred provision: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Federal ​ ​ ​ ​ (1,104 ) ​ ​ ​ ​ ​ (1,749 ) ​ ​ ​ ​ ​ (557 ) ​ ​ State ​ ​ ​ ​ — ​ ​ ​ ​ ​ 783 ​ ​ ​ ​ ​ (139 ) ​ ​ Total deferred ​ ​ ​ ​ (1,104 ) ​ ​ ​ ​ ​ (966 ) ​ ​ ​ ​ ​ (696 ) ​ ​ Total income tax expense ​ ​ ​ $ 5,960 ​ ​ ​ ​ $ 4,841 ​ ​ ​ ​ $ 2,169 ​ ​ ​
Schedule of reconciliation of the anticipated income tax expense	​ ​ ​ December 31, ​ ​ ​ ​ 2016 ​ ​ 2015 ​ ​ 2014 ​ ​ ​ ​ (In thousands) ​ Income tax expense at statutory federal rate ​ ​ ​ $ 6,409 ​ ​ ​ ​ $ 4,855 ​ ​ ​ ​ $ 2,291 ​ ​ State tax expense, net of federal tax effect ​ ​ ​ ​ 147 ​ ​ ​ ​ ​ 566 ​ ​ ​ ​ ​ 259 ​ ​ Statutory rate reductions ​ ​ ​ ​ — ​ ​ ​ ​ ​ 811 ​ ​ ​ ​ ​ — ​ ​ Income exempt from tax ​ ​ ​ ​ (687 ) ​ ​ ​ ​ ​ (627 ) ​ ​ ​ ​ ​ (523 ) ​ ​ Other items, net ​ ​ ​ ​ 91 ​ ​ ​ ​ ​ 42 ​ ​ ​ ​ ​ 19 ​ ​ Income tax expense before change in valuation allowance ​ ​ ​ ​ 5,960 ​ ​ ​ ​ ​ 5,647 ​ ​ ​ ​ ​ 2,046 ​ ​ Change in valuation allowance ​ ​ ​ ​ — ​ ​ ​ ​ ​ (806 ) ​ ​ ​ ​ ​ 123 ​ ​ Income tax expense ​ ​ ​ $ 5,960 ​ ​ ​ ​ $ 4,841 ​ ​ ​ ​ $ 2,169 ​ ​ ​
Schedule of components of deferred tax assets and liabilities	​ ​ ​ December 31, ​ ​ ​ ​ 2016 ​ ​ 2015 ​ ​ ​ ​ (In thousands) ​ Deferred tax assets: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Allowance for loan losses ​ ​ ​ $ 6,378 ​ ​ ​ ​ $ 5,086 ​ ​ Net operating loss carryforwards ​ ​ ​ ​ 996 ​ ​ ​ ​ ​ 1,162 ​ ​ Purchase accounting adjustments ​ ​ ​ ​ 20 ​ ​ ​ ​ ​ 228 ​ ​ Deferred fees ​ ​ ​ ​ 1,437 ​ ​ ​ ​ ​ 1,262 ​ ​ Deferred expenses ​ ​ ​ ​ 716 ​ ​ ​ ​ ​ 767 ​ ​ Start-up costs ​ ​ ​ ​ 275 ​ ​ ​ ​ ​ 317 ​ ​ Unrealized loss on derivatives ​ ​ ​ ​ — ​ ​ ​ ​ ​ 96 ​ ​ Depreciation ​ ​ ​ ​ — ​ ​ ​ ​ ​ 82 ​ ​ Other ​ ​ ​ ​ 192 ​ ​ ​ ​ ​ 201 ​ ​ Gross deferred tax assets ​ ​ ​ ​ 10,014 ​ ​ ​ ​ ​ 9,201 ​ ​ Deferred tax liabilities: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Tax bad debt reserve ​ ​ ​ ​ 195 ​ ​ ​ ​ ​ 645 ​ ​ Depreciation ​ ​ ​ ​ 255 ​ ​ ​ ​ ​ — ​ ​ Unrealized gain on derivatives ​ ​ ​ ​ 258 ​ ​ ​ ​ ​ — ​ ​ Unrealized gain on available for sale securities ​ ​ ​ ​ 221 ​ ​ ​ ​ ​ 219 ​ ​ Gross deferred tax liabilities ​ ​ ​ ​ 929 ​ ​ ​ ​ ​ 864 ​ ​ Net deferred tax asset ​ ​ ​ $ 9,085 ​ ​ ​ ​ $ 8,337 ​ ​ ​

Earnings per Share (Tables)

Earnings per Share (Tables)	12 Months Ended
	Dec. 31, 2016
Earnings Per Share [Abstract]
Schedule of reconciliation of earnings available to common stockholders and basic weighted-average common shares outstanding to diluted weighted average common shares outstanding	​ ​ ​ For the Years Ended December 31, ​ ​ ​ ​ 2016 ​ ​ 2015 ​ ​ 2014 ​ ​ ​ ​ (In thousands, except per share data) ​ Net income ​ ​ ​ $ 12,350 ​ ​ ​ ​ $ 9,030 ​ ​ ​ ​ $ 4,568 ​ ​ Preferred stock dividends ​ ​ ​ ​ — ​ ​ ​ ​ ​ (125 ) ​ ​ ​ ​ ​ (110 ) ​ ​ Dividends to participating securities ​ ​ ​ ​ (27 ) ​ ​ ​ ​ ​ (5 ) ​ ​ ​ ​ ​ — ​ ​ Undistributed earnings allocated to participating securities ​ ​ ​ ​ (211 ) ​ ​ ​ ​ ​ (226 ) ​ ​ ​ ​ ​ (81 ) ​ ​ Net income for earnings per share calculation ​ ​ ​ $ 12,112 ​ ​ ​ ​ $ 8,674 ​ ​ ​ ​ $ 4,377 ​ ​ Weighted average shares outstanding, basic ​ ​ ​ ​ 7,396 ​ ​ ​ ​ ​ 7,072 ​ ​ ​ ​ ​ 5,578 ​ ​ Effect of dilutive equity-based awards ​ ​ ​ ​ 95 ​ ​ ​ ​ ​ 69 ​ ​ ​ ​ ​ 28 ​ ​ Weighted average shares outstanding, diluted ​ ​ ​ ​ 7,491 ​ ​ ​ ​ ​ 7,141 ​ ​ ​ ​ ​ 5,606 ​ ​ Net earnings per common share: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Basic earnings per common share ​ ​ ​ $ 1.64 ​ ​ ​ ​ $ 1.23 ​ ​ ​ ​ $ 0.78 ​ ​ Diluted earnings per common share ​ ​ ​ ​ 1.62 ​ ​ ​ ​ ​ 1.21 ​ ​ ​ ​ ​ 0.78 ​ ​

Stock Based Compensation Plans

Stock Based Compensation Plans (Tables)	12 Months Ended
	Dec. 31, 2016
Compensation and Retirement Disclosure [Abstract]
Schedule of status of outstanding stock options	​ ​ ​ December 31, ​ ​ ​ ​ Number of ​ ​ Weighted ​ Options outstanding at beginning of period ​ ​ ​ ​ 195,928 ​ ​ ​ ​ $ 18.07 ​ ​ Exercised ​ ​ ​ ​ (64,120 ) ​ ​ ​ ​ ​ 17.15 ​ ​ Expired ​ ​ ​ ​ (10,820 ) ​ ​ ​ ​ ​ 17.85 ​ ​ Options outstanding at end of period ​ ​ ​ ​ 120,988 ​ ​ ​ ​ ​ 18.58 ​ ​ Options exercisable at end of period ​ ​ ​ ​ 119,538 ​ ​ ​ ​ ​ 18.62 ​ ​ ​
Schedule of activity for restricted stock	​ ​ ​ December 31, ​ ​ ​ ​ Number of ​ ​ Weighted ​ Unvested at beginning of period ​ ​ ​ ​ 143,325 ​ ​ ​ ​ $ 15.92 ​ ​ Granted ​ ​ ​ ​ 29,933 ​ ​ ​ ​ ​ 22.45 ​ ​ Vested ​ ​ ​ ​ (75,781 ) ​ ​ ​ ​ ​ 16.66 ​ ​ Forfeited ​ ​ ​ ​ (883 ) ​ ​ ​ ​ ​ 20.39 ​ ​ Unvested at end of period ​ ​ ​ ​ 96,594 ​ ​ ​ ​ ​ 19.80 ​ ​ ​

Comprehensive Income (Tables)

Comprehensive Income (Tables)	12 Months Ended
	Dec. 31, 2016
Comprehensive Income [Abstract]
Schedule of changes in accumulated other comprehensive income (loss) by component	​ ​ ​ Net Unrealized Gain ​ ​ Net Unrealized Gain ​ ​ Total ​ ​ ​ ​ (In thousands) ​ Balance at December 31, 2015 ​ ​ ​ $ 405 ​ ​ ​ ​ $ (178 ) ​ ​ ​ ​ $ 227 ​ ​ Other comprehensive (loss) income before reclassifications ​ ​ ​ ​ (109 ) ​ ​ ​ ​ ​ 659 ​ ​ ​ ​ ​ 550 ​ ​ Amounts reclassified from accumulated other comprehensive ​ ​ ​ ​ 113 ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ 113 ​ ​ Net other comprehensive income ​ ​ ​ ​ 4 ​ ​ ​ ​ ​ 659 ​ ​ ​ ​ ​ 663 ​ ​ Balance at December 31, 2016 ​ ​ ​ $ 409 ​ ​ ​ ​ $ 481 ​ ​ ​ ​ $ 890 ​ ​ ​ ​ ​ ​ Net Unrealized Gain ​ ​ Net Unrealized Gain ​ ​ Total ​ ​ ​ ​ (In thousands) ​ Balance at December 31, 2014 ​ ​ ​ $ 644 ​ ​ ​ ​ $ (113 ) ​ ​ ​ ​ $ 531 ​ ​ Other comprehensive loss before reclassifications ​ ​ ​ ​ (239 ) ​ ​ ​ ​ ​ (65 ) ​ ​ ​ ​ ​ (304 ) ​ ​ Amounts reclassified from accumulated other comprehensive ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ Net other comprehensive loss ​ ​ ​ ​ (239 ) ​ ​ ​ ​ ​ (65 ) ​ ​ ​ ​ ​ (304 ) ​ ​ Balance at December 31, 2015 ​ ​ ​ $ 405 ​ ​ ​ ​ $ (178 ) ​ ​ ​ ​ $ 227 ​ ​ ​ ​ ​ ​ Net Unrealized Gain ​ ​ Net Unrealized Gain ​ ​ Total ​ ​ ​ ​ (In thousands) ​ Balance at December 31, 2013 ​ ​ ​ $ 424 ​ ​ ​ ​ $ — ​ ​ ​ ​ $ 424 ​ ​ Other comprehensive income (loss) before reclassifications ​ ​ ​ ​ 220 ​ ​ ​ ​ ​ (113 ) ​ ​ ​ ​ ​ 107 ​ ​ Amounts reclassified from accumulated other comprehensive ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ Net other comprehensive income (loss) ​ ​ ​ ​ 220 ​ ​ ​ ​ ​ (113 ) ​ ​ ​ ​ ​ 107 ​ ​ Balance at December 31, 2014 ​ ​ ​ $ 644 ​ ​ ​ ​ $ (113 ) ​ ​ ​ ​ $ 531 ​ ​ ​

Derivative Instruments (Tables)

Derivative Instruments (Tables)	12 Months Ended
	Dec. 31, 2016
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule of derivative instruments	December 31, 2016: ​ ​ ​ Notional ​ ​ Original ​ ​ Received ​ ​ Paid ​ ​ Fair ​ ​ ​ ​ (Dollars in thousands) ​ Cash flow hedge: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Interest rate swap on FHLB advance ​ ​ ​ $ 25,000 ​ ​ ​ 4.7 years ​ ​ 3-month LIBOR ​ ​ ​ ​ 1.62 % ​ ​ ​ ​ $ (91 ) ​ ​ Interest rate swap on FHLB advance ​ ​ ​ $ 25,000 ​ ​ ​ 5.0 years ​ ​ 3-month LIBOR ​ ​ ​ ​ 1.83 % ​ ​ ​ ​ ​ (138 ) ​ ​ Interest rate swap on FHLB advance ​ ​ ​ $ 25,000 ​ ​ ​ 5.0 years ​ ​ 3-month LIBOR ​ ​ ​ ​ 1.48 % ​ ​ ​ ​ ​ 249 ​ ​ Interest rate swap on FHLB advance ​ ​ ​ $ 25,000 ​ ​ ​ 5.0 years ​ ​ 3-month LIBOR ​ ​ ​ ​ 1.22 % ​ ​ ​ ​ ​ 717 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ $ 737 ​ ​ ​ December 31, 2015: ​ ​ ​ Notional ​ ​ Original ​ ​ Received ​ ​ Paid ​ ​ Fair ​ ​ ​ ​ (Dollars in thousands) ​ Cash flow hedge: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Interest rate swap on FHLB advance ​ ​ ​ $ 25,000 ​ ​ ​ 4.7 years ​ ​ 3-month LIBOR ​ ​ ​ ​ 1.62 % ​ ​ ​ ​ $ (181 ) ​ ​ Interest rate swap on FHLB advance ​ ​ ​ $ 25,000 ​ ​ ​ 5.0 years ​ ​ 3-month LIBOR ​ ​ ​ ​ 1.83 % ​ ​ ​ ​ ​ (276 ) ​ ​ Interest rate swap on FHLB advance ​ ​ ​ $ 25,000 ​ ​ ​ 5.0 years ​ ​ 3-month LIBOR ​ ​ ​ ​ 1.48 % ​ ​ ​ ​ ​ 181 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ $ (276 ) ​ ​ ​
Schedule of interest rate swap transactions	​ ​ ​ Notional ​ ​ Effective Date of ​ ​ Duration of ​ ​ Counterparty ​ ​ ​ ​ (Dollars in thousands) ​ Type of borrowing: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ FHLB 90-day advance ​ ​ ​ $ 25,000 ​ ​ ​ April 1, 2014 ​ ​ 4.7 years ​ ​ Bank of Montreal ​ FHLB 90-day advance ​ ​ ​ $ 25,000 ​ ​ ​ January 2, 2015 ​ ​ 5.0 years ​ ​ Bank of Montreal ​ FHLB 90-day advance ​ ​ ​ $ 25,000 ​ ​ ​ August 26, 2015 ​ ​ 5.0 years ​ ​ Bank of Montreal ​ FHLB 90-day advance ​ ​ ​ $ 25,000 ​ ​ ​ July 1, 2016 ​ ​ 5.0 years ​ ​ Bank of Montreal ​
Schedule of changes in the consolidated statements of comprehensive income related to interest rate derivatives designated as hedges of cash flows	​ ​ ​ December 31, ​ ​ December 31, ​ ​ ​ ​ (In thousands) ​ Interest rate swap on FHLB advance: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Unrealized gain (loss) recognized in accumulated other comprehensive income ​ ​ ​ $ 1,013 ​ ​ ​ ​ $ (89 ) ​ ​ Income tax (expense) benefit on items recognized in accumulated other comprehensive income ​ ​ ​ ​ (354 ) ​ ​ ​ ​ ​ 24 ​ ​ Other comprehensive income (loss) ​ ​ ​ $ 659 ​ ​ ​ ​ $ (65 ) ​ ​ Amount recognized in interest expense on hedged FHLB advance ​ ​ ​ $ 1,386 ​ ​ ​ ​ $ 991 ​ ​ ​ ​

Fair Value of Financial Instr45

Fair Value of Financial Instruments (Tables)	12 Months Ended
	Dec. 31, 2016
Fair Value Disclosures [Abstract]
Schedule of carrying values and fair values of the Company s financial instruments	​ ​ ​ December 31, 2016 ​ ​ ​ ​ Carrying ​ ​ Fair ​ ​ Level 1 ​ ​ Level 2 ​ ​ Level 3 ​ ​ ​ ​ (In thousands) ​ Financial Assets: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Cash and due from banks ​ ​ ​ $ 96,026 ​ ​ ​ ​ $ 96,026 ​ ​ ​ ​ $ 96,026 ​ ​ ​ ​ $ — ​ ​ ​ ​ $ — ​ ​ Federal funds sold ​ ​ ​ ​ 329 ​ ​ ​ ​ ​ 329 ​ ​ ​ ​ ​ 329 ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ Available for sale securities ​ ​ ​ ​ 87,751 ​ ​ ​ ​ ​ 87,751 ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ 87,751 ​ ​ ​ ​ ​ — ​ ​ Held to maturity securities ​ ​ ​ ​ 16,859 ​ ​ ​ ​ ​ 16,851 ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ 16,851 ​ ​ ​ ​ ​ — ​ ​ Loans held for sale ​ ​ ​ ​ 254 ​ ​ ​ ​ ​ 254 ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ 254 ​ ​ ​ ​ ​ — ​ ​ Loans receivable, net ​ ​ ​ ​ 1,343,895 ​ ​ ​ ​ ​ 1,339,055 ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ 1,339,055 ​ ​ Accrued interest receivable ​ ​ ​ ​ 4,958 ​ ​ ​ ​ ​ 4,958 ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ 4,958 ​ ​ FHLB stock ​ ​ ​ ​ 7,943 ​ ​ ​ ​ ​ 7,943 ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ 7,943 ​ ​ Derivative asset ​ ​ ​ ​ 737 ​ ​ ​ ​ ​ 737 ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ 737 ​ ​ ​ ​ ​ — ​ ​ Financial Liabilities: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Demand deposits ​ ​ ​ $ 187,593 ​ ​ ​ ​ $ 187,593 ​ ​ ​ ​ $ — ​ ​ ​ ​ $ — ​ ​ ​ ​ $ 187,593 ​ ​ NOW and money market ​ ​ ​ ​ 402,982 ​ ​ ​ ​ ​ 402,982 ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ 402,982 ​ ​ Savings ​ ​ ​ ​ 96,601 ​ ​ ​ ​ ​ 96,601 ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ 96,601 ​ ​ Time deposits ​ ​ ​ ​ 601,861 ​ ​ ​ ​ ​ 603,456 ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ 603,456 ​ ​ Advances from the FHLB ​ ​ ​ ​ 160,000 ​ ​ ​ ​ ​ 160,118 ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ 160,118 ​ ​ Subordinated debentures ​ ​ ​ ​ 25,051 ​ ​ ​ ​ ​ 25,645 ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ 25,645 ​ ​ ​ ​ ​ December 31, 2015 ​ ​ ​ ​ Carrying ​ ​ Fair ​ ​ Level 1 ​ ​ Level 2 ​ ​ Level 3 ​ ​ ​ ​ (In thousands) ​ Financial Assets: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Cash and due from banks ​ ​ ​ $ 49,562 ​ ​ ​ ​ $ 49,562 ​ ​ ​ ​ $ 49,562 ​ ​ ​ ​ $ — ​ ​ ​ ​ $ — ​ ​ Federal funds sold ​ ​ ​ ​ 39,035 ​ ​ ​ ​ ​ 39,035 ​ ​ ​ ​ ​ 39,035 ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ Available for sale securities ​ ​ ​ ​ 40,581 ​ ​ ​ ​ ​ 40,581 ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ 40,581 ​ ​ ​ ​ ​ — ​ ​ Held to maturity securities ​ ​ ​ ​ 10,226 ​ ​ ​ ​ ​ 10,228 ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ 10,228 ​ ​ ​ ​ ​ — ​ ​ Loans receivable, net ​ ​ ​ ​ 1,129,748 ​ ​ ​ ​ ​ 1,135,227 ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ 1,135,227 ​ ​ Accrued interest receivable ​ ​ ​ ​ 4,071 ​ ​ ​ ​ ​ 4,071 ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ 4,071 ​ ​ FHLB stock ​ ​ ​ ​ 6,554 ​ ​ ​ ​ ​ 6,554 ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ 6,554 ​ ​ Financial Liabilities: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Demand deposits ​ ​ ​ $ 164,553 ​ ​ ​ ​ $ 164,553 ​ ​ ​ ​ $ — ​ ​ ​ ​ $ — ​ ​ ​ ​ $ 164,553 ​ ​ NOW and money market ​ ​ ​ ​ 347,846 ​ ​ ​ ​ ​ 347,846 ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ 347,846 ​ ​ Savings ​ ​ ​ ​ 97,846 ​ ​ ​ ​ ​ 97,846 ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ 97,846 ​ ​ Time deposits ​ ​ ​ ​ 436,697 ​ ​ ​ ​ ​ 438,214 ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ 438,214 ​ ​ Advances from the FHLB ​ ​ ​ ​ 120,000 ​ ​ ​ ​ ​ 120,025 ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ 120,025 ​ ​ Subordinated debentures ​ ​ ​ ​ 25,000 ​ ​ ​ ​ ​ 24,505 ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ 24,505 ​ ​ Derivative liability ​ ​ ​ ​ 276 ​ ​ ​ ​ ​ 276 ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ 276 ​ ​ ​ ​ ​ — ​ ​

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	12 Months Ended
	Dec. 31, 2016
Fair Value Disclosures [Abstract]
Schedule of financial instruments carried at fair value on a recurring basis	​ ​ ​ Fair Value ​ ​ ​ ​ Level 1 ​ ​ Level 2 ​ ​ Level 3 ​ ​ ​ ​ (In thousands) ​ December 31, 2016: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Available for sale investment securities: ​ ​ ​ ​ U.S. Government and agency obligations ​ ​ ​ $ — ​ ​ ​ ​ $ 62,698 ​ ​ ​ ​ $ — ​ ​ State agency, U.S. territories and municipal obligations ​ ​ ​ ​ — ​ ​ ​ ​ ​ 14,763 ​ ​ ​ ​ ​ — ​ ​ Corporate bonds ​ ​ ​ ​ — ​ ​ ​ ​ ​ 10,290 ​ ​ ​ ​ ​ — ​ ​ Derivative asset ​ ​ ​ ​ — ​ ​ ​ ​ ​ 737 ​ ​ ​ ​ ​ — ​ ​ December 31, 2015: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Available for sale investment securities: ​ ​ ​ ​ U.S. Government and agency obligations ​ ​ ​ $ — ​ ​ ​ ​ $ 7,143 ​ ​ ​ ​ $ — ​ ​ State agency, U.S. territories and municipal obligations ​ ​ ​ ​ — ​ ​ ​ ​ ​ 17,504 ​ ​ ​ ​ ​ — ​ ​ Corporate bonds ​ ​ ​ ​ — ​ ​ ​ ​ ​ 11,437 ​ ​ ​ ​ ​ — ​ ​ Mortgage backed securities ​ ​ ​ ​ — ​ ​ ​ ​ ​ 4,497 ​ ​ ​ ​ ​ — ​ ​ Derivative liability ​ ​ ​ ​ — ​ ​ ​ ​ ​ (276 ) ​ ​ ​ ​ ​ — ​ ​
Schedule of financial instruments carried at fair value on a nonrecurring basis	​ ​ ​ Fair Value ​ ​ ​ ​ Level 1 ​ ​ Level 2 ​ ​ Level 3 ​ ​ ​ ​ (In thousands) ​ December 31, 2016: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Impaired loans ​ ​ ​ $ — ​ ​ ​ ​ $ — ​ ​ ​ ​ $ 4,849 ​ ​ Foreclosed real estate ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ 272 ​ ​ December 31, 2015: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Impaired loans ​ ​ ​ $ — ​ ​ ​ ​ $ — ​ ​ ​ ​ $ 10,922 ​ ​ Foreclosed real estate ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ 1,248 ​ ​
Schedule of quantitative inputs and assumptions for Level 3 financial instruments carried at fair value on a nonrecurring basis	​ ​ ​ Fair ​ ​ Valuation ​ ​ Unobservable ​ ​ Range ​ ​ ​ ​ (Dollars in thousands) ​ ​ ​ ​ ​ ​ ​ December 31, 2016: ​ ​ ​ ​ ​ Impaired loans ​ ​ ​ $ 4,849 ​ ​ ​ Appraisals ​ ​ Discount to appraised value ​ ​ 8.00 – 28.00% ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Discounted cash flows ​ ​ Discount rate ​ ​ 4.25 – 6.25% ​ Foreclosed real ​ ​ ​ $ 272 ​ ​ ​ Appraisals ​ ​ Discount to appraised value ​ ​ 20% ​ December 31, 2015: ​ ​ ​ ​ ​ Impaired loans ​ ​ ​ $ 10,922 ​ ​ ​ Appraisals ​ ​ Discount to appraised value ​ ​ 8.00% to 10.00% ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Discounted cash flows ​ ​ Discount rate ​ ​ 3.25% to 7.00% ​ Foreclosed real ​ ​ ​ $ 1,248 ​ ​ ​ Appraisals ​ ​ Discount to appraised value ​ ​ 10.0% to 25.0% ​

Regulatory Matters (Tables)

Regulatory Matters (Tables)	12 Months Ended
	Dec. 31, 2016
Banking and Thrift [Abstract]
Schedule of capital amounts and ratios	​ ​ ​ Actual Capital ​ ​ For Capital ​ ​ To be Well ​ ​ ​ ​ Amount ​ ​ Ratio ​ ​ Amount ​ ​ Ratio ​ ​ Amount ​ ​ Ratio ​ ​ ​ ​ (Dollars in thousands) ​ Bankwell Bank ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2016 ​ ​ ​ ​ ​ ​ ​ Common Equity Tier 1 Capital to Risk-Weighted Assets ​ ​ ​ $ 157,604 ​ ​ ​ ​ ​ 11.59 % ​ ​ ​ ​ $ 61,168 ​ ​ ​ ​ ​ 4.50 % ​ ​ ​ ​ $ 88,353 ​ ​ ​ ​ ​ 6.50% ​ ​ Total Capital to Risk-Weighted Assets ​ ​ ​ ​ 174,610 ​ ​ ​ ​ ​ 12.85 % ​ ​ ​ ​ ​ 108,742 ​ ​ ​ ​ ​ 8.00 % ​ ​ ​ ​ ​ 135,928 ​ ​ ​ ​ ​ 10.00% ​ ​ Tier I Capital to Risk-Weighted Assets ​ ​ ​ ​ 157,604 ​ ​ ​ ​ ​ 11.59 % ​ ​ ​ ​ ​ 81,557 ​ ​ ​ ​ ​ 6.00 % ​ ​ ​ ​ ​ 108,742 ​ ​ ​ ​ ​ 8.00% ​ ​ Tier I Capital to Average Assets ​ ​ ​ ​ 157,604 ​ ​ ​ ​ ​ 10.10 % ​ ​ ​ ​ ​ 62,428 ​ ​ ​ ​ ​ 4.00 % ​ ​ ​ ​ ​ 78,035 ​ ​ ​ ​ ​ 5.00% ​ ​ Bankwell Financial Group, Inc. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2016 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Common Equity Tier 1 Capital to Risk-Weighted Assets ​ ​ ​ $ 141,338 ​ ​ ​ ​ ​ 10.82 % ​ ​ ​ ​ $ 58,789 ​ ​ ​ ​ ​ 4.50 % ​ ​ ​ ​ ​ N/A ​ ​ ​ ​ ​ N/A ​ ​ Total Capital to Risk-Weighted Assets ​ ​ ​ ​ 184,371 ​ ​ ​ ​ ​ 14.11 % ​ ​ ​ ​ ​ 104,513 ​ ​ ​ ​ ​ 8.00 % ​ ​ ​ ​ ​ N/A ​ ​ ​ ​ ​ N/A ​ ​ Tier I Capital to Risk-Weighted Assets ​ ​ ​ ​ 141,338 ​ ​ ​ ​ ​ 10.82 % ​ ​ ​ ​ ​ 78,385 ​ ​ ​ ​ ​ 6.00 % ​ ​ ​ ​ ​ N/A ​ ​ ​ ​ ​ N/A ​ ​ Tier I Capital to Average Assets ​ ​ ​ ​ 141,338 ​ ​ ​ ​ ​ 9.06 % ​ ​ ​ ​ ​ 62,415 ​ ​ ​ ​ ​ 4.00 % ​ ​ ​ ​ ​ N/A ​ ​ ​ ​ ​ N/A ​ ​ ​ ​ ​ Actual Capital ​ ​ For Capital ​ ​ To be Well ​ ​ ​ ​ Amount ​ ​ Ratio ​ ​ Amount ​ ​ Ratio ​ ​ Amount ​ ​ Ratio ​ ​ ​ ​ (Dollars in thousands) ​ Bankwell Bank ​ ​ ​ ​ ​ ​ ​ December 31, 2015 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Common Equity Tier 1 Capital to Risk-Weighted Assets ​ ​ ​ $ 142,651 ​ ​ ​ ​ ​ 12.18 % ​ ​ ​ ​ $ 52,709 ​ ​ ​ ​ ​ 4.50 % ​ ​ ​ ​ $ 76,135 ​ ​ ​ ​ ​ 6.50% ​ ​ Total Capital to Risk-Weighted Assets ​ ​ ​ ​ 156,820 ​ ​ ​ ​ ​ 13.39 % ​ ​ ​ ​ ​ 93,705 ​ ​ ​ ​ ​ 8.00 % ​ ​ ​ ​ ​ 117,131 ​ ​ ​ ​ ​ 10.00% ​ ​ Tier I Capital to Risk-Weighted Assets ​ ​ ​ ​ 142,651 ​ ​ ​ ​ ​ 12.18 % ​ ​ ​ ​ ​ 70,279 ​ ​ ​ ​ ​ 6.00 % ​ ​ ​ ​ ​ 93,705 ​ ​ ​ ​ ​ 8.00% ​ ​ Tier I Capital to Average Assets ​ ​ ​ ​ 142,651 ​ ​ ​ ​ ​ 10.84 % ​ ​ ​ ​ ​ 52,620 ​ ​ ​ ​ ​ 4.00 % ​ ​ ​ ​ ​ 65,775 ​ ​ ​ ​ ​ 5.00% ​ ​ Bankwell Financial Group, Inc. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2015 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Common Equity Tier 1 Capital to Risk-Weighted Assets ​ ​ ​ $ 128,692 ​ ​ ​ ​ ​ 10.92 % ​ ​ ​ ​ $ 53,052 ​ ​ ​ ​ ​ 4.50 % ​ ​ ​ ​ ​ N/A ​ ​ ​ ​ ​ N/A ​ ​ Total Capital to Risk-Weighted Assets ​ ​ ​ ​ 167,867 ​ ​ ​ ​ ​ 14.24 % ​ ​ ​ ​ ​ 94,315 ​ ​ ​ ​ ​ 8.00 % ​ ​ ​ ​ ​ N/A ​ ​ ​ ​ ​ N/A ​ ​ Tier I Capital to Risk-Weighted Assets ​ ​ ​ ​ 128,692 ​ ​ ​ ​ ​ 10.92 % ​ ​ ​ ​ ​ 70,736 ​ ​ ​ ​ ​ 6.00 % ​ ​ ​ ​ ​ N/A ​ ​ ​ ​ ​ N/A ​ ​ Tier I Capital to Average Assets ​ ​ ​ ​ 128,692 ​ ​ ​ ​ ​ 9.75 % ​ ​ ​ ​ ​ 52,819 ​ ​ ​ ​ ​ 4.00 % ​ ​ ​ ​ ​ N/A ​ ​ ​ ​ ​ N/A ​ ​

Related Party Transactions (Tab

Related Party Transactions (Tables)	12 Months Ended
	Dec. 31, 2016
Related Party Transactions [Abstract]
Schedule of changes in loans outstanding	​ ​ ​ December 31, ​ ​ ​ ​ 2016 ​ ​ 2015 ​ ​ ​ ​ (In thousands) ​ Balance, beginning of year ​ ​ ​ $ 12,891 ​ ​ ​ ​ $ 7,509 ​ ​ Additional loans ​ ​ ​ ​ 9,722 ​ ​ ​ ​ ​ 5,476 ​ ​ Repayments and changes in status ​ ​ ​ ​ (142 ) ​ ​ ​ ​ ​ (94 ) ​ ​ Balance, end of year ​ ​ ​ $ 22,471 ​ ​ ​ ​ $ 12,891 ​ ​ ​

Parent Corporation Only Finan49

Parent Corporation Only Financial Statements (Tables)	12 Months Ended
	Dec. 31, 2016
Parent Corporation Only Financial Statements [Abstract]
Schedule of condensed Statements of Financial Condition	Condensed Statements of Financial Condition ​ ​ ​ December 31, ​ ​ ​ ​ 2016 ​ ​ 2015 ​ ​ ​ ​ (Dollars in Thousands) ​ ASSETS ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Cash and due from banks ​ ​ ​ $ 5,677 ​ ​ ​ ​ $ 5,692 ​ ​ Investment in subsidiary ​ ​ ​ ​ 162,162 ​ ​ ​ ​ ​ 145,729 ​ ​ Premises and equipment, net ​ ​ ​ ​ 55 ​ ​ ​ ​ ​ 120 ​ ​ Deferred income taxes, net ​ ​ ​ ​ 3,063 ​ ​ ​ ​ ​ 5,448 ​ ​ Other assets ​ ​ ​ ​ 3,889 ​ ​ ​ ​ ​ 2,060 ​ ​ Total assets ​ ​ ​ $ 174,846 ​ ​ ​ ​ $ 159,049 ​ ​ LIABILITIES AND SHAREHOLDERS’ EQUITY ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Subordinated debentures ​ ​ ​ $ 25,051 ​ ​ ​ ​ $ 25,000 ​ ​ Accrued expenses and other liabilities ​ ​ ​ ​ 3,900 ​ ​ ​ ​ ​ 2,280 ​ ​ Stockholders’ equity ​ ​ ​ ​ 145,895 ​ ​ ​ ​ ​ 131,769 ​ ​ Total liabilities and stockholders’ equity ​ ​ ​ $ 174,846 ​ ​ ​ ​ $ 159,049 ​ ​ ​
Schedule of condensed Statements of Income	Condensed Statements of Income ​ ​ ​ Year Ended December 31, ​ ​ ​ ​ 2016 ​ ​ 2015 ​ ​ 2014 ​ ​ ​ ​ (Dollars in Thousands) ​ Interest income ​ ​ ​ $ 23 ​ ​ ​ ​ $ 38 ​ ​ ​ ​ $ 45 ​ ​ Other income ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ Total income ​ ​ ​ ​ 23 ​ ​ ​ ​ ​ 38 ​ ​ ​ ​ ​ 45 ​ ​ Expenses ​ ​ ​ ​ 3,444 ​ ​ ​ ​ ​ 2,714 ​ ​ ​ ​ ​ 1,728 ​ ​ Loss before equity in undistributed earnings of subsidiaries ​ ​ ​ ​ (3,421 ) ​ ​ ​ ​ ​ (2,676 ) ​ ​ ​ ​ ​ (1,683 ) ​ ​ Equity in undistributed earnings of subsidiaries ​ ​ ​ ​ 15,771 ​ ​ ​ ​ ​ 11,706 ​ ​ ​ ​ ​ 6,251 ​ ​ Net Income ​ ​ ​ $ 12,350 ​ ​ ​ ​ $ 9,030 ​ ​ ​ ​ $ 4,568 ​ ​ ​
Schedule of condensed Statements of Cash Flows	Condensed Statements of Cash Flows ​ ​ ​ For the Years Ended December 31, ​ ​ ​ ​ 2016 ​ ​ 2015 ​ ​ 2014 ​ ​ ​ ​ (Dollars in Thousands) ​ Cash flows from operating activities ​ ​ ​ ​ Net income ​ ​ ​ $ 12,350 ​ ​ ​ ​ $ 9,030 ​ ​ ​ ​ $ 4,568 ​ ​ Adjustments to reconcile net income to net cash used by operating activities: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Equity in undistributed earnings ​ ​ ​ ​ (15,771 ) ​ ​ ​ ​ ​ (11,706 ) ​ ​ ​ ​ ​ (6,251 ) ​ ​ Increase in other assets ​ ​ ​ ​ (1,828 ) ​ ​ ​ ​ ​ (418 ) ​ ​ ​ ​ ​ (1,245 ) ​ ​ Decrease (Increase) in deferred income taxes, net ​ ​ ​ ​ 2,385 ​ ​ ​ ​ ​ (2,192 ) ​ ​ ​ ​ ​ (846 ) ​ ​ Increase in other liabilities ​ ​ ​ ​ 1,620 ​ ​ ​ ​ ​ 421 ​ ​ ​ ​ ​ 641 ​ ​ Stock-based compensation ​ ​ ​ ​ 1,188 ​ ​ ​ ​ ​ 1,033 ​ ​ ​ ​ ​ 573 ​ ​ Net cash used by operating activities ​ ​ ​ ​ (56 ) ​ ​ ​ ​ ​ (3,832 ) ​ ​ ​ ​ ​ (2,560 ) ​ ​ Cash flows from investing activities ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Cash paid for acquisitions ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ (3,648 ) ​ ​ Capital contribution to Bankwell Bank ​ ​ ​ ​ — ​ ​ ​ ​ ​ (15,000 ) ​ ​ ​ ​ ​ (40,000 ) ​ ​ Decrease in premises and equipment, net ​ ​ ​ ​ 65 ​ ​ ​ ​ ​ 84 ​ ​ ​ ​ ​ 85 ​ ​ Net cash provided by (used by) investing activities ​ ​ ​ ​ 65 ​ ​ ​ ​ ​ (14,916 ) ​ ​ ​ ​ ​ (43,563 ) ​ ​ Cash flows from financing activities ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Proceeds from issuance of subordinated debt ​ ​ ​ ​ — ​ ​ ​ ​ ​ 25,000 ​ ​ ​ ​ ​ — ​ ​ Amortization of debt issuance costs ​ ​ ​ ​ 51 ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ Redemption of SBLF Preferred Stock ​ ​ ​ ​ — ​ ​ ​ ​ ​ (10,980 ) ​ ​ ​ ​ ​ — ​ ​ Proceeds from exercise of options ​ ​ ​ ​ 1,106 ​ ​ ​ ​ ​ 501 ​ ​ ​ ​ ​ 207 ​ ​ Dividends paid on common stock ​ ​ ​ ​ (1,661 ) ​ ​ ​ ​ ​ (376 ) ​ ​ ​ ​ ​ — ​ ​ Dividends paid on preferred stock ​ ​ ​ ​ — ​ ​ ​ ​ ​ (125 ) ​ ​ ​ ​ ​ (110 ) ​ ​ Proceeds from issuance of common stock ​ ​ ​ ​ 200 ​ ​ ​ ​ ​ 3,780 ​ ​ ​ ​ ​ 44,704 ​ ​ Net tax benefit related to stock-based compensation ​ ​ ​ ​ 280 ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ Net cash (used by) provided by financing activities ​ ​ ​ ​ (24 ) ​ ​ ​ ​ ​ 17,800 ​ ​ ​ ​ ​ 44,801 ​ ​ Net decrease in cash and cash equivalents ​ ​ ​ ​ (15 ) ​ ​ ​ ​ ​ (948 ) ​ ​ ​ ​ ​ (1,322 ) ​ ​ Cash and cash equivalents: ​ ​ ​ ​ Beginning of year ​ ​ ​ ​ 5,692 ​ ​ ​ ​ ​ 6,640 ​ ​ ​ ​ ​ 7,962 ​ ​ End of year ​ ​ ​ $ 5,677 ​ ​ ​ ​ $ 5,692 ​ ​ ​ ​ $ 6,640 ​ ​ Supplemental disclosures of cash flows information: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Cash paid for: ​ ​ ​ ​ Interest ​ ​ ​ $ — ​ ​ ​ ​ $ — ​ ​ ​ ​ $ — ​ ​ Income taxes ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​

Quarterly Financial Informati50

Quarterly Financial Information of Bankwell Financial Group, Inc. (Unaudited) (Tables)	12 Months Ended
	Dec. 31, 2016
Quarterly Financial Information Disclosure [Abstract]
Schedule of quarterly financial information	2016 4th Quarter 3rd Quarter 2nd Quarter 1st Quarter Total interest income $ 16,642 $ 15,633 $ 14,711 $ 14,004 Total interest expense 3,354 3,106 2,832 2,606 Net interest income 13,288 12,527 11,879 11,398 Provision for loan losses 748 1,219 1,301 646 Non-interest income 401 750 853 672 Non-interest expense 7,768 7,481 7,215 7,080 Income before income taxes 5,173 4,577 4,216 4,344 Provision from income taxes 1,850 1,437 1,320 1,353 Net income $ 3,323 $ 3,140 $ 2,896 $ 2,991 Net income attributable to common stockholders $ 3,323 $ 3,140 $ 2,896 $ 2,991 Earnings per share: Basic $ 0.44 $ 0.42 $ 0.38 $ 0.40 Diluted $ 0.43 $ 0.41 $ 0.38 $ 0.40 2015 4th Quarter 3rd Quarter 2nd Quarter 1st Quarter Total interest income $ 13,907 $ 13,186 $ 12,388 $ 11,273 Total interest expense 2,671 2,269 1,647 1,379 Net interest income 11,236 10,917 10,741 9,894 Provision for loan losses 354 1,489 654 733 Non-interest income 820 1,211 854 599 Non-interest expense 7,661 7,158 7,380 6,972 Income before income taxes 4,041 3,481 3,561 2,788 Provision from income taxes 1,423 1,228 1,275 915 Net income $ 2,618 $ 2,253 $ 2,286 $ 1,873 Net income attributable to common stockholders $ 2,574 $ 2,226 $ 2,259 $ 1,846 Earnings per share: Basic $ 0.35 $ 0.31 $ 0.31 $ 0.26 Diluted $ 0.35 $ 0.31 $ 0.31 $ 0.26 Note: Due to rounding, quarterly earnings per share may not sum to reported annual earnings per share.

Nature of Operations and Summ51

Nature of Operations and Summary of Significant Accounting Policies (Detail Textuals) $ in Millions	1 Months Ended			12 Months Ended
	Aug. 19, 2015USD ($)	Oct. 31, 2014USD ($)Branch	Nov. 30, 2013USD ($)Branch	Dec. 31, 2016Segment
Business Acquisition [Line Items]
Number of reportable segment | Segment				1
Premises and equipment, depreciation methods				straight-line method
Premises and equipment, estimated useful lives				3 to 39 years
Payments of debt issuance costs	$ 0.5
Wilton Bank ("Wilton")
Business Acquisition [Line Items]
Number of branch acquired | Branch			1
Amount of loans acquired			$ 25.1
Amount of deposits acquired			$ 64.2
Quinnipiac Bank and Trust Company
Business Acquisition [Line Items]
Number of branch acquired | Branch		2
Amount of loans acquired		$ 97.8
Amount of deposits acquired		$ 100.6

Shareholders' Equity (Detail Te

Shareholders' Equity (Detail Textuals) - USD ($) $ / shares in Units, $ in Thousands	May 15, 2014	Dec. 31, 2014
Stockholders Equity Note [Line Items]
Number of common shares authorized to issue in initial public offering		2,702,703
Number of common shares issued		$ 44,704
Initial Public Offering ("IPO")
Stockholders Equity Note [Line Items]
Number of common shares authorized to issue in initial public offering	2,702,703
Price per share of shares issued (in dollars per share)	$ 18
Net proceeds from the IPO	$ 44,700
Underwriting discount	2,500
Amount of expenses incurred in public offering	$ 1,300

Shareholders' Equity (Detail 53

Shareholders' Equity (Detail textuals 1) - USD ($)	12 Months Ended
	Dec. 31, 2016	Oct. 01, 2014
Stockholders Equity Note [Line Items]
Number of common stock share included in each unit issued	1
Number of non-transferable warrant included in each unit issued	1
Number of common stock shares purchased under each warrant	0.3221
Exercise price of warrant	$ 14
Number of warrants available to purchase Shares of common stock	945,789
Amount received for issuance of common stock for warrants exercised	$ 4,264,946
Number of common stock shares issued on exercise of warrants	304,639
Number of warrant exercised	838,369
Total gross proceeds from warrants exercised	$ 3,779,888
Number of common stock issued for warrants	269,992
Quinnipiac Bank and Trust Company
Stockholders Equity Note [Line Items]
Number of common stock shares purchased under each warrant		0.56
Exercise price of warrant		$ 17.86
Number of warrants issued		68,600
Number of warrant exercised	11,200

Restrictions on cash and due 54

Restrictions on cash and due from banks (Detail Textuals) $ in Thousands	Dec. 31, 2016USD ($)
Restrictions On Cash And Due From Banks [Abstract]
Capital required to maintain in the Federal Reserve Bank	$ 125

Goodwill and other intangible55

Goodwill and other intangible assets - Summary of goodwill (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Goodwill [Roll Forward]
Balance, beginning of the period	$ 2,589	$ 2,589
Impairment
Balance, end of the period	$ 2,589	$ 2,589

Goodwill and other intangible56

Goodwill and other intangible assets - Information regarding the carrying amounts and accumulated amortization of amortized intangible assets (Details 1) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items]
Net Intangible Asset	$ 501	$ 652
Core deposit intangible
Finite-Lived Intangible Assets [Line Items]
Gross Intangible Asset	1,029	1,029
Accumulated Amortization	528	377
Net Intangible Asset	$ 501	$ 652

Investment Securities - Summary

Investment Securities - Summary of amortized cost, gross unrealized gains and losses and fair values of available for sale and held to maturity securities (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Available for sale securities:
Amortized Cost	$ 87,119	$ 39,955
Gross Unrealized Gains	809	1,068
Gross Unrealized Losses	(177)	(442)
Fair Value	87,751	40,581
Held to maturity securities:
Amortized Cost	16,859	10,226
Gross Unrealized Gains	15	21
Gross Unrealized Losses	(23)	(19)
Fair value	16,851	10,228
U.S. Government and agency obligations
Available for sale securities:
Due in less than one year, Amortized Cost		6,198
Due in less than one year, Gross Unrealized Gains
Due in less than one year, Gross Unrealized Losses		(77)
Due in less than one year, Fair Value		6,121
Due from one through five years, Amortized Cost	62,357	394
Due from one through five years, Gross Unrealized Gains	295	4
Due from one through five years, Gross Unrealized Losses	(49)	(2)
Due from one through five years, Fair Value	62,603	396
Due from five through ten years, Amortized Cost		647
Due from five through ten years, Gross Unrealized Gains
Due from five through ten years, Gross Unrealized Losses		(21)
Due from five through ten years, Fair Value		626
Due after ten years, Amortized Cost	100	7,239
Due after ten years, Gross Unrealized Gains		4
Due after ten years, Gross Unrealized Losses	(5)	(100)
Due after ten years, Fair Value	95	7,143
Amortized Cost	62,457
Gross Unrealized Gains	295
Gross Unrealized Losses	(54)
Fair Value	62,698
Held to maturity securities:
Due in less than one year, Amortized cost
Due in less than one year, Gross Unrealized Gains
Due in less than one year. Gross Unrealized Losses
Due in less than one year, Fair Value
State agency and municipal obligations
Available for sale securities:
Due from one through five years, Amortized Cost	827	520
Due from one through five years, Gross Unrealized Gains	24	39
Due from one through five years, Gross Unrealized Losses	(3)
Due from one through five years, Fair Value	848	559
Due from five through ten years, Amortized Cost	8,045	9,762
Due from five through ten years, Gross Unrealized Gains	189	361
Due from five through ten years, Gross Unrealized Losses	(1)	(322)
Due from five through ten years, Fair Value	8,233	9,801
Due after ten years, Amortized Cost	5,623	6,778
Due after ten years, Gross Unrealized Gains	178	367
Due after ten years, Gross Unrealized Losses	(119)	(1)
Due after ten years, Fair Value	5,682	7,144
Amortized Cost	14,495	17,060
Gross Unrealized Gains	391	767
Gross Unrealized Losses	(123)	(323)
Fair Value	14,763	17,504
Held to maturity securities:
Due from one through five years, Amortized Cost	2,135
Due from one through five years, Gross Unrealized Gains
Due from one through five years, Gross Unrealized Losses
Due from one through five years, Fair Value	2,135
Due after ten years, Amortized Cost	13,575	9,026
Due after ten years, Gross Unrealized Gains
Due after ten years, Gross Unrealized Losses
Due after ten years, Fair Value	13,575	9,026
Amortized Cost	15,710
Gross Unrealized Gains
Gross Unrealized Losses
Fair value	15,710
Corporate bonds
Available for sale securities:
Due in less than one year, Amortized Cost	2,022	1,010
Due in less than one year, Gross Unrealized Gains	56	22
Due in less than one year, Gross Unrealized Losses
Due in less than one year, Fair Value	2,078	1,032
Due from one through five years, Amortized Cost	8,145	9,233
Due from one through five years, Gross Unrealized Gains	67	156
Due from one through five years, Gross Unrealized Losses		(9)
Due from one through five years, Fair Value	8,212	9,380
Due from five through ten years, Amortized Cost		1,013
Due from five through ten years, Gross Unrealized Gains		12
Due from five through ten years, Gross Unrealized Losses
Due from five through ten years, Fair Value		1,025
Amortized Cost	10,167	11,256
Gross Unrealized Gains	123	190
Gross Unrealized Losses		(9)
Fair Value	10,290	11,437
Held to maturity securities:
Due from one through five years, Amortized Cost	1,000
Due from one through five years, Gross Unrealized Gains
Due from one through five years, Gross Unrealized Losses	(23)
Due from one through five years, Fair Value	977
Due from five through ten years, Amortized Cost		1,000
Due from five through ten years, Gross Unrealized Gains
Due from five through ten years, Gross Unrealized Losses		(19)
Due from five through ten years, Fair Value		981
Government-sponsored mortgage backed securities
Available for sale securities:
No contractual maturity Amortized Cost		4,400
No contractual maturity Gross Unrealized Gains		107
No contractual maturity Gross Unrealized Losses		(10)
No contractual maturity Fair Value		4,497
Held to maturity securities:
No contractual maturity, Amortized Cost	149	200
No contractual maturity, Gross Unrealized Gains	15	21
No contractual maturity, Gross Unrealized Losses
No contractual maturity, Fair Value	$ 164	$ 221

Investment Securities - Informa

Investment Securities - Information regarding investment securities with unrealized losses, aggregated by investment category and length of time that individual securities (Details 1) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items]
Less than 12 months - Fair Value	$ 6,779	$ 8,350
Less than 12 months - Unrealized Loss	(200)	(93)
12 Months or More - Fair Value		2,337
12 Months or More - Unrealized Loss		(368)
Fair value - Total	6,779	10,687
Unrealized Loss - Total	(200)	(461)
U.S. Government and agency obligations
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items]
Less than 12 months - Fair Value	3,045	5,486
Less than 12 months - Unrealized Loss	(54)	(60)
12 Months or More - Fair Value		1,259
12 Months or More - Unrealized Loss		(40)
Fair value - Total	3,045	6,745
Unrealized Loss - Total	(54)	(100)
State agency, U.S. Territories and municipal obligations
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items]
Less than 12 months - Fair Value	2,756	126
Less than 12 months - Unrealized Loss	(123)	(1)
12 Months or More - Fair Value		665
12 Months or More - Unrealized Loss		(322)
Fair value - Total	2,756	791
Unrealized Loss - Total	(123)	(323)
Corporate bonds
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items]
Less than 12 months - Fair Value	978	1,970
Less than 12 months - Unrealized Loss	(23)	(28)
12 Months or More - Fair Value
12 Months or More - Unrealized Loss
Fair value - Total	978	1,970
Unrealized Loss - Total	$ (23)	(28)
Government-sponsored mortgage backed securities
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items]
Less than 12 months - Fair Value		768
Less than 12 months - Unrealized Loss		(4)
12 Months or More - Fair Value		413
12 Months or More - Unrealized Loss		(6)
Fair value - Total		1,181
Unrealized Loss - Total		$ (10)

Investment Securities (Detail T

Investment Securities (Detail Textuals)	12 Months Ended
	Dec. 31, 2016USD ($)Security	Dec. 31, 2015USD ($)Security
Financial Instruments Owned and Pledged as Collateral [Line Items]
Net realized on sales of investment securities issued from "COFINA" corporate bond	$ 115,000
Gross gains from the sales of investment securities	129,400
Gross losses from the sales of investment securities	$ 244,600
Number of securities | Security	11	29
Public deposits
Financial Instruments Owned and Pledged as Collateral [Line Items]
Securities pledged as collateral	$ 60,000,000	$ 5,900,000

Loans Receivable and Allowanc60

Loans Receivable and Allowance for Loan Losses - Summary of loan portfolio (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Loans and Leases Receivable Disclosure [Line Items]
Total loans	$ 1,365,939	$ 1,147,513
Allowance for loan losses	(17,982)	(14,169)	$ (10,860)	$ (8,382)
Deferred loan origination fees, net	(4,071)	(3,605)
Unamortized loan premiums	9	9
Loans receivable, net	1,343,895	1,129,748
Real estate loans
Loans and Leases Receivable Disclosure [Line Items]
Total loans	1,148,492	972,925
Real estate loans | Residential
Loans and Leases Receivable Disclosure [Line Items]
Total loans	181,310	177,184
Allowance for loan losses	(1,646)	(1,444)	(1,431)	(1,310)
Real estate loans | Commercial
Loans and Leases Receivable Disclosure [Line Items]
Total loans	845,322	697,542
Allowance for loan losses	(9,415)	(7,705)	(5,480)	(3,616)
Real estate loans | Construction
Loans and Leases Receivable Disclosure [Line Items]
Total loans	107,441	82,273
Allowance for loan losses	(2,105)	(1,504)	(1,102)	(1,032)
Real estate loans | Home equity
Loans and Leases Receivable Disclosure [Line Items]
Total loans	14,419	15,926
Allowance for loan losses	(156)	(174)	(205)	(190)
Commercial business
Loans and Leases Receivable Disclosure [Line Items]
Total loans	215,914	172,853
Allowance for loan losses	(4,283)	(3,334)	(2,638)	(2,225)
Consumer
Loans and Leases Receivable Disclosure [Line Items]
Total loans	1,533	1,735
Allowance for loan losses	(377)	(8)	(4)	(9)
Originated
Loans and Leases Receivable Disclosure [Line Items]
Total loans	1,295,711	1,058,819
Allowance for loan losses	(17,883)	(14,128)	(10,860)	(8,382)
Deferred loan origination fees, net	(4,071)	(3,605)
Unamortized loan premiums	9	9
Loans receivable, net	1,273,766	1,041,095
Originated | Real estate loans
Loans and Leases Receivable Disclosure [Line Items]
Total loans	1,096,583	908,223
Originated | Real estate loans | Residential
Loans and Leases Receivable Disclosure [Line Items]
Total loans	178,549	174,311
Allowance for loan losses	(1,646)	(1,444)	(1,431)	(1,310)
Originated | Real estate loans | Commercial
Loans and Leases Receivable Disclosure [Line Items]
Total loans	802,156	643,524
Allowance for loan losses	(9,386)	(7,693)	(5,480)	(3,616)
Originated | Real estate loans | Construction
Loans and Leases Receivable Disclosure [Line Items]
Total loans	107,329	81,242
Allowance for loan losses	(2,105)	(1,504)	(1,102)	(1,032)
Originated | Real estate loans | Home equity
Loans and Leases Receivable Disclosure [Line Items]
Total loans	8,549	9,146
Allowance for loan losses	(156)	(174)	(205)	(190)
Originated | Commercial business
Loans and Leases Receivable Disclosure [Line Items]
Total loans	198,456	150,479
Allowance for loan losses	(4,240)	(3,310)	(2,638)	(2,225)
Originated | Consumer
Loans and Leases Receivable Disclosure [Line Items]
Total loans	672	117
Allowance for loan losses	(350)	(3)	(4)	(9)
Acquired
Loans and Leases Receivable Disclosure [Line Items]
Total loans	70,228	88,694
Allowance for loan losses	(99)	(41)
Deferred loan origination fees, net
Unamortized loan premiums
Loans receivable, net	70,129	88,653
Acquired | Real estate loans
Loans and Leases Receivable Disclosure [Line Items]
Total loans	51,909	64,702
Acquired | Real estate loans | Residential
Loans and Leases Receivable Disclosure [Line Items]
Total loans	2,761	2,873
Allowance for loan losses
Acquired | Real estate loans | Commercial
Loans and Leases Receivable Disclosure [Line Items]
Total loans	43,166	54,018
Allowance for loan losses	(29)	(12)
Acquired | Real estate loans | Construction
Loans and Leases Receivable Disclosure [Line Items]
Total loans	112	1,031
Allowance for loan losses
Acquired | Real estate loans | Home equity
Loans and Leases Receivable Disclosure [Line Items]
Total loans	5,870	6,780
Allowance for loan losses
Acquired | Commercial business
Loans and Leases Receivable Disclosure [Line Items]
Total loans	17,458	22,374
Allowance for loan losses	(43)	(24)
Acquired | Consumer
Loans and Leases Receivable Disclosure [Line Items]
Total loans	861	1,618
Allowance for loan losses	$ (27)	$ (5)

Loans Receivable and Allowanc61

Loans Receivable and Allowance for Loan Losses - Summary of activity in accretable yields for acquired loan portfolio (Details 1) - Acquired - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2016	Dec. 31, 2015
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]
Balance at beginning of period		$ 871	$ 1,382
Acquisition
Accretion		(154)	(157)
Other	[1]	(51)	(354)
Balance at end of period		$ 666	$ 871
[1]	Represents changes in cash flows expected to be collected due to loan sales or payoffs.

Loans Receivable and Allowanc62

Loans Receivable and Allowance for Loan Losses - Summary of allowance for loan losses by portfolio segment (Details 2) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	$ 14,169	$ 10,860	$ 8,382
Charge-offs	(111)	(30)	(103)
Recoveries	10	109	429
Provisions	3,914	3,230	2,152
Ending balance	17,982	14,169	10,860
Commercial business
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	3,334	2,638	2,225
Charge-offs	(69)	(15)
Recoveries		100	4
Provisions	1,018	611	409
Ending balance	4,283	3,334	2,638
Consumer
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	8	4	9
Charge-offs	(35)	(15)	(3)
Recoveries	10	9	425
Provisions	394	10	(427)
Ending balance	377	8	4
Residential | Real estate loans
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	1,444	1,431	1,310
Charge-offs
Recoveries
Provisions	202	13	121
Ending balance	1,646	1,444	1,431
Commercial | Real estate loans
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	7,705	5,480	3,616
Charge-offs
Recoveries
Provisions	1,710	2,225	1,864
Ending balance	9,415	7,705	5,480
Construction | Real estate loans
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	1,504	1,102	1,032
Charge-offs	(7)		(100)
Recoveries
Provisions	608	402	170
Ending balance	2,105	1,504	1,102
Home equity | Real estate loans
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	174	205	190
Charge-offs
Recoveries
Provisions	(18)	(31)	15
Ending balance	156	174	205
Originated
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	14,128	10,860	8,382
Charge-offs	(69)	(6)	(3)
Recoveries	8	7	429
Provisions	3,816	3,267	2,052
Ending balance	17,883	14,128	10,860
Originated | Commercial business
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	3,310	2,638	2,225
Charge-offs	(59)
Recoveries			4
Provisions	989	672	409
Ending balance	4,240	3,310	2,638
Originated | Consumer
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	3	4	9
Charge-offs	(10)	(6)	(3)
Recoveries	8	7	425
Provisions	349	(2)	(427)
Ending balance	350	3	4
Originated | Residential | Real estate loans
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	1,444	1,431	1,310
Charge-offs
Recoveries
Provisions	202	13	121
Ending balance	1,646	1,444	1,431
Originated | Commercial | Real estate loans
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	7,693	5,480	3,616
Charge-offs
Recoveries
Provisions	1,693	2,213	1,864
Ending balance	9,386	7,693	5,480
Originated | Construction | Real estate loans
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	1,504	1,102	1,032
Charge-offs
Recoveries
Provisions	601	402	70
Ending balance	2,105	1,504	1,102
Originated | Home equity | Real estate loans
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	174	205	190
Charge-offs
Recoveries
Provisions	(18)	(31)	15
Ending balance	156	174	205
Acquired
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	41
Charge-offs	(42)	(24)	(100)
Recoveries	2	102
Provisions	98	(37)	100
Ending balance	99	41
Acquired | Commercial business
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	24
Charge-offs	(10)	(15)
Recoveries		100
Provisions	29	(61)
Ending balance	43	24
Acquired | Consumer
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	5
Charge-offs	(25)	(9)
Recoveries	2	2
Provisions	45	12
Ending balance	27	5
Acquired | Residential | Real estate loans
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance
Charge-offs
Recoveries
Provisions
Ending balance
Acquired | Commercial | Real estate loans
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	12
Charge-offs
Recoveries
Provisions	17	12
Ending balance	29	12
Acquired | Construction | Real estate loans
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance
Charge-offs	(7)		(100)
Recoveries
Provisions	7		100
Ending balance
Acquired | Home equity | Real estate loans
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance
Charge-offs
Recoveries
Provisions
Ending balance

Loans Receivable and Allowanc63

Loans Receivable and Allowance for Loan Losses - Summary, by portfolio segment and impairment methodology, of allowance for loan losses and related portfolio (Details 3) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Loans individually evaluated for impairment:
Loans individually evaluated for impairment, Portfolio	$ 4,849	$ 10,922
Loans individually evaluated for impairment, Allowance	418	111
Loans collectively evaluated for impairment:
Loans collectively evaluated for impairment, Portfolio	1,361,090	1,136,591
Loans collectively evaluated for impairment, Allowance	17,564	14,058
Portfolio, Total	1,365,939	1,147,513
Allowance, Total	17,982	14,169	$ 10,860	$ 8,382
Real estate loans
Loans collectively evaluated for impairment:
Portfolio, Total	1,148,492	972,925
Commercial business
Loans individually evaluated for impairment:
Loans individually evaluated for impairment, Portfolio	1,882	3,410
Loans individually evaluated for impairment, Allowance	42	92
Loans collectively evaluated for impairment:
Loans collectively evaluated for impairment, Portfolio	214,032	169,443
Loans collectively evaluated for impairment, Allowance	4,241	3,242
Portfolio, Total	215,914	172,853
Allowance, Total	4,283	3,334	2,638	2,225
Consumer
Loans individually evaluated for impairment:
Loans individually evaluated for impairment, Portfolio	368	7
Loans individually evaluated for impairment, Allowance	368	5
Loans collectively evaluated for impairment:
Loans collectively evaluated for impairment, Portfolio	1,165	1,728
Loans collectively evaluated for impairment, Allowance	9	4
Portfolio, Total	1,533	1,735
Allowance, Total	377	8	4	9
Residential | Real estate loans
Loans individually evaluated for impairment:
Loans individually evaluated for impairment, Portfolio	969	1,833
Loans individually evaluated for impairment, Allowance		2
Loans collectively evaluated for impairment:
Loans collectively evaluated for impairment, Portfolio	180,341	175,351
Loans collectively evaluated for impairment, Allowance	1,646	1,442
Portfolio, Total	181,310	177,184
Allowance, Total	1,646	1,444	1,431	1,310
Commercial | Real estate loans
Loans individually evaluated for impairment:
Loans individually evaluated for impairment, Portfolio	918	5,053
Loans individually evaluated for impairment, Allowance	8	12
Loans collectively evaluated for impairment:
Loans collectively evaluated for impairment, Portfolio	844,404	692,489
Loans collectively evaluated for impairment, Allowance	9,407	7,692
Portfolio, Total	845,322	697,542
Allowance, Total	9,415	7,705	5,480	3,616
Construction | Real estate loans
Loans collectively evaluated for impairment:
Loans collectively evaluated for impairment, Portfolio	107,441	82,273
Loans collectively evaluated for impairment, Allowance	2,105	1,504
Portfolio, Total	107,441	82,273
Allowance, Total	2,105	1,504	1,102	1,032
Home equity | Real estate loans
Loans individually evaluated for impairment:
Loans individually evaluated for impairment, Portfolio	712	619
Loans individually evaluated for impairment, Allowance
Loans collectively evaluated for impairment:
Loans collectively evaluated for impairment, Portfolio	13,707	15,307
Loans collectively evaluated for impairment, Allowance	156	174
Portfolio, Total	14,419	15,926
Allowance, Total	156	174	205	190
Originated
Loans individually evaluated for impairment:
Loans individually evaluated for impairment, Portfolio	3,263	8,523
Loans individually evaluated for impairment, Allowance	347	73
Loans collectively evaluated for impairment:
Loans collectively evaluated for impairment, Portfolio	1,292,448	1,050,296
Loans collectively evaluated for impairment, Allowance	17,536	14,055
Portfolio, Total	1,295,711	1,058,819
Allowance, Total	17,883	14,128	10,860	8,382
Originated | Real estate loans
Loans collectively evaluated for impairment:
Portfolio, Total	1,096,583	908,223
Originated | Commercial business
Loans individually evaluated for impairment:
Loans individually evaluated for impairment, Portfolio	920	1,977
Loans individually evaluated for impairment, Allowance	5	71
Loans collectively evaluated for impairment:
Loans collectively evaluated for impairment, Portfolio	197,536	148,502
Loans collectively evaluated for impairment, Allowance	4,235	3,239
Portfolio, Total	198,456	150,479
Allowance, Total	4,240	3,310	2,638	2,225
Originated | Consumer
Loans individually evaluated for impairment:
Loans individually evaluated for impairment, Portfolio	341
Loans individually evaluated for impairment, Allowance	341
Loans collectively evaluated for impairment:
Loans collectively evaluated for impairment, Portfolio	331	117
Loans collectively evaluated for impairment, Allowance	9	4
Portfolio, Total	672	117
Allowance, Total	350	3	4	9
Originated | Residential | Real estate loans
Loans individually evaluated for impairment:
Loans individually evaluated for impairment, Portfolio	969	1,833
Loans individually evaluated for impairment, Allowance		2
Loans collectively evaluated for impairment:
Loans collectively evaluated for impairment, Portfolio	177,580	172,478
Loans collectively evaluated for impairment, Allowance	1,646	1,442
Portfolio, Total	178,549	174,311
Allowance, Total	1,646	1,444	1,431	1,310
Originated | Commercial | Real estate loans
Loans individually evaluated for impairment:
Loans individually evaluated for impairment, Portfolio	774	4,291
Loans individually evaluated for impairment, Allowance	1
Loans collectively evaluated for impairment:
Loans collectively evaluated for impairment, Portfolio	801,382	639,233
Loans collectively evaluated for impairment, Allowance	9,385	7,692
Portfolio, Total	802,156	643,524
Allowance, Total	9,386	7,693	5,480	3,616
Originated | Construction | Real estate loans
Loans collectively evaluated for impairment:
Loans collectively evaluated for impairment, Portfolio	107,329	81,242
Loans collectively evaluated for impairment, Allowance	2,105	1,504
Portfolio, Total	107,329	81,242
Allowance, Total	2,105	1,504	1,102	1,032
Originated | Home equity | Real estate loans
Loans individually evaluated for impairment:
Loans individually evaluated for impairment, Portfolio	259	422
Loans individually evaluated for impairment, Allowance
Loans collectively evaluated for impairment:
Loans collectively evaluated for impairment, Portfolio	8,290	8,724
Loans collectively evaluated for impairment, Allowance	156	174
Portfolio, Total	8,549	9,146
Allowance, Total	156	174	205	190
Acquired
Loans individually evaluated for impairment:
Loans individually evaluated for impairment, Portfolio	1,586	2,399
Loans individually evaluated for impairment, Allowance	71	38
Loans collectively evaluated for impairment:
Loans collectively evaluated for impairment, Portfolio	68,642	86,295
Loans collectively evaluated for impairment, Allowance	28	3
Portfolio, Total	70,228	88,694
Allowance, Total	99	41
Acquired | Real estate loans
Loans collectively evaluated for impairment:
Portfolio, Total	51,909	64,702
Acquired | Commercial business
Loans individually evaluated for impairment:
Loans individually evaluated for impairment, Portfolio	962	1,433
Loans individually evaluated for impairment, Allowance	37	21
Loans collectively evaluated for impairment:
Loans collectively evaluated for impairment, Portfolio	16,496	20,941
Loans collectively evaluated for impairment, Allowance	6	3
Portfolio, Total	17,458	22,374
Allowance, Total	43	24
Acquired | Consumer
Loans individually evaluated for impairment:
Loans individually evaluated for impairment, Portfolio	27	7
Loans individually evaluated for impairment, Allowance	27	5
Loans collectively evaluated for impairment:
Loans collectively evaluated for impairment, Portfolio	834	1,611
Loans collectively evaluated for impairment, Allowance
Portfolio, Total	861	1,618
Allowance, Total	27	5
Acquired | Residential | Real estate loans
Loans individually evaluated for impairment:
Loans individually evaluated for impairment, Portfolio
Loans individually evaluated for impairment, Allowance
Loans collectively evaluated for impairment:
Loans collectively evaluated for impairment, Portfolio	2,761	2,873
Loans collectively evaluated for impairment, Allowance
Portfolio, Total	2,761	2,873
Allowance, Total
Acquired | Commercial | Real estate loans
Loans individually evaluated for impairment:
Loans individually evaluated for impairment, Portfolio	144	762
Loans individually evaluated for impairment, Allowance	7	12
Loans collectively evaluated for impairment:
Loans collectively evaluated for impairment, Portfolio	43,022	53,256
Loans collectively evaluated for impairment, Allowance	22
Portfolio, Total	43,166	54,018
Allowance, Total	29	12
Acquired | Construction | Real estate loans
Loans collectively evaluated for impairment:
Loans collectively evaluated for impairment, Portfolio	112	1,031
Loans collectively evaluated for impairment, Allowance
Portfolio, Total	112	1,031
Allowance, Total
Acquired | Home equity | Real estate loans
Loans individually evaluated for impairment:
Loans individually evaluated for impairment, Portfolio	453	197
Loans individually evaluated for impairment, Allowance
Loans collectively evaluated for impairment:
Loans collectively evaluated for impairment, Portfolio	5,417	6,583
Loans collectively evaluated for impairment, Allowance
Portfolio, Total	5,870	6,780
Allowance, Total

Loans Receivable and Allowanc64

Loans Receivable and Allowance for Loan Losses - Summary of loan portfolio quality indicators by portfolio segment (Details 4) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Financing Receivable, Recorded Investment [Line Items]
Total loans	$ 1,365,939	$ 1,147,513
Real estate loans
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,148,492	972,925
Real estate loans | Residential
Financing Receivable, Recorded Investment [Line Items]
Total loans	181,310	177,184
Real estate loans | Commercial
Financing Receivable, Recorded Investment [Line Items]
Total loans	845,322	697,542
Real estate loans | Construction
Financing Receivable, Recorded Investment [Line Items]
Total loans	107,441	82,273
Real estate loans | Home equity
Financing Receivable, Recorded Investment [Line Items]
Total loans	14,419	15,926
Commercial business
Financing Receivable, Recorded Investment [Line Items]
Total loans	215,914	172,853
Consumer
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,533	1,735
Originated
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,295,711	1,058,819
Originated | Real estate loans
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,096,583	908,223
Originated | Real estate loans | Residential
Financing Receivable, Recorded Investment [Line Items]
Total loans	178,549	174,311
Originated | Real estate loans | Commercial
Financing Receivable, Recorded Investment [Line Items]
Total loans	802,156	643,524
Originated | Real estate loans | Construction
Financing Receivable, Recorded Investment [Line Items]
Total loans	107,329	81,242
Originated | Real estate loans | Home equity
Financing Receivable, Recorded Investment [Line Items]
Total loans	8,549	9,146
Originated | Commercial business
Financing Receivable, Recorded Investment [Line Items]
Total loans	198,456	150,479
Originated | Consumer
Financing Receivable, Recorded Investment [Line Items]
Total loans	672	117
Acquired
Financing Receivable, Recorded Investment [Line Items]
Total loans	70,228	88,694
Acquired | Real estate loans
Financing Receivable, Recorded Investment [Line Items]
Total loans	51,909	64,702
Acquired | Real estate loans | Residential
Financing Receivable, Recorded Investment [Line Items]
Total loans	2,761	2,873
Acquired | Real estate loans | Commercial
Financing Receivable, Recorded Investment [Line Items]
Total loans	43,166	54,018
Acquired | Real estate loans | Construction
Financing Receivable, Recorded Investment [Line Items]
Total loans	112	1,031
Acquired | Real estate loans | Home equity
Financing Receivable, Recorded Investment [Line Items]
Total loans	5,870	6,780
Acquired | Commercial business
Financing Receivable, Recorded Investment [Line Items]
Total loans	17,458	22,374
Acquired | Consumer
Financing Receivable, Recorded Investment [Line Items]
Total loans	861	1,618
Commercial credit quality indicators
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,168,677	952,668
Commercial credit quality indicators | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,159,544	942,150
Commercial credit quality indicators | Special mention
Financing Receivable, Recorded Investment [Line Items]
Total loans	6,390	3,311
Commercial credit quality indicators | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans	2,743	7,143
Commercial credit quality indicators | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total loans
Commercial credit quality indicators | Loss
Financing Receivable, Recorded Investment [Line Items]
Total loans		64
Commercial credit quality indicators | Real estate loans | Commercial
Financing Receivable, Recorded Investment [Line Items]
Total loans	845,322	697,542
Commercial credit quality indicators | Real estate loans | Commercial | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans	838,831	691,136
Commercial credit quality indicators | Real estate loans | Commercial | Special mention
Financing Receivable, Recorded Investment [Line Items]
Total loans	6,189	1,595
Commercial credit quality indicators | Real estate loans | Commercial | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans	302	4,811
Commercial credit quality indicators | Real estate loans | Commercial | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total loans
Commercial credit quality indicators | Real estate loans | Commercial | Loss
Financing Receivable, Recorded Investment [Line Items]
Total loans
Commercial credit quality indicators | Real estate loans | Construction
Financing Receivable, Recorded Investment [Line Items]
Total loans	107,441	82,273
Commercial credit quality indicators | Real estate loans | Construction | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans	107,441	81,472
Commercial credit quality indicators | Real estate loans | Construction | Special mention
Financing Receivable, Recorded Investment [Line Items]
Total loans
Commercial credit quality indicators | Real estate loans | Construction | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans		801
Commercial credit quality indicators | Real estate loans | Construction | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total loans
Commercial credit quality indicators | Real estate loans | Construction | Loss
Financing Receivable, Recorded Investment [Line Items]
Total loans
Commercial credit quality indicators | Commercial business
Financing Receivable, Recorded Investment [Line Items]
Total loans	215,914	172,853
Commercial credit quality indicators | Commercial business | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans	213,272	169,542
Commercial credit quality indicators | Commercial business | Special mention
Financing Receivable, Recorded Investment [Line Items]
Total loans	201	1,716
Commercial credit quality indicators | Commercial business | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans	2,441	1,531
Commercial credit quality indicators | Commercial business | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total loans
Commercial credit quality indicators | Commercial business | Loss
Financing Receivable, Recorded Investment [Line Items]
Total loans		64
Commercial credit quality indicators | Originated
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,107,941	875,245
Commercial credit quality indicators | Originated | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,101,014	868,699
Commercial credit quality indicators | Originated | Special mention
Financing Receivable, Recorded Investment [Line Items]
Total loans	4,720	2,713
Commercial credit quality indicators | Originated | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans	2,207	3,769
Commercial credit quality indicators | Originated | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total loans
Commercial credit quality indicators | Originated | Loss
Financing Receivable, Recorded Investment [Line Items]
Total loans		64
Commercial credit quality indicators | Originated | Real estate loans | Commercial
Financing Receivable, Recorded Investment [Line Items]
Total loans	802,156	643,524
Commercial credit quality indicators | Originated | Real estate loans | Commercial | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans	797,249	638,709
Commercial credit quality indicators | Originated | Real estate loans | Commercial | Special mention
Financing Receivable, Recorded Investment [Line Items]
Total loans	4,605	1,595
Commercial credit quality indicators | Originated | Real estate loans | Commercial | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans	302	3,220
Commercial credit quality indicators | Originated | Real estate loans | Commercial | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total loans
Commercial credit quality indicators | Originated | Real estate loans | Commercial | Loss
Financing Receivable, Recorded Investment [Line Items]
Total loans
Commercial credit quality indicators | Originated | Real estate loans | Construction
Financing Receivable, Recorded Investment [Line Items]
Total loans	107,329	81,242
Commercial credit quality indicators | Originated | Real estate loans | Construction | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans	107,329	81,242
Commercial credit quality indicators | Originated | Real estate loans | Construction | Special mention
Financing Receivable, Recorded Investment [Line Items]
Total loans
Commercial credit quality indicators | Originated | Real estate loans | Construction | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans
Commercial credit quality indicators | Originated | Real estate loans | Construction | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total loans
Commercial credit quality indicators | Originated | Real estate loans | Construction | Loss
Financing Receivable, Recorded Investment [Line Items]
Total loans
Commercial credit quality indicators | Originated | Commercial business
Financing Receivable, Recorded Investment [Line Items]
Total loans	198,456	150,479
Commercial credit quality indicators | Originated | Commercial business | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans	196,436	148,748
Commercial credit quality indicators | Originated | Commercial business | Special mention
Financing Receivable, Recorded Investment [Line Items]
Total loans	115	1,118
Commercial credit quality indicators | Originated | Commercial business | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,905	549
Commercial credit quality indicators | Originated | Commercial business | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total loans
Commercial credit quality indicators | Originated | Commercial business | Loss
Financing Receivable, Recorded Investment [Line Items]
Total loans		64
Commercial credit quality indicators | Acquired
Financing Receivable, Recorded Investment [Line Items]
Total loans	60,736	77,423
Commercial credit quality indicators | Acquired | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans	58,530	73,451
Commercial credit quality indicators | Acquired | Special mention
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,670	598
Commercial credit quality indicators | Acquired | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans	536	3,374
Commercial credit quality indicators | Acquired | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total loans
Commercial credit quality indicators | Acquired | Loss
Financing Receivable, Recorded Investment [Line Items]
Total loans
Commercial credit quality indicators | Acquired | Real estate loans | Commercial
Financing Receivable, Recorded Investment [Line Items]
Total loans	43,166	54,018
Commercial credit quality indicators | Acquired | Real estate loans | Commercial | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans	41,582	52,427
Commercial credit quality indicators | Acquired | Real estate loans | Commercial | Special mention
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,584
Commercial credit quality indicators | Acquired | Real estate loans | Commercial | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans		1,591
Commercial credit quality indicators | Acquired | Real estate loans | Commercial | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total loans
Commercial credit quality indicators | Acquired | Real estate loans | Commercial | Loss
Financing Receivable, Recorded Investment [Line Items]
Total loans
Commercial credit quality indicators | Acquired | Real estate loans | Construction
Financing Receivable, Recorded Investment [Line Items]
Total loans	112	1,031
Commercial credit quality indicators | Acquired | Real estate loans | Construction | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans	112	230
Commercial credit quality indicators | Acquired | Real estate loans | Construction | Special mention
Financing Receivable, Recorded Investment [Line Items]
Total loans
Commercial credit quality indicators | Acquired | Real estate loans | Construction | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans		801
Commercial credit quality indicators | Acquired | Real estate loans | Construction | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total loans
Commercial credit quality indicators | Acquired | Real estate loans | Construction | Loss
Financing Receivable, Recorded Investment [Line Items]
Total loans
Commercial credit quality indicators | Acquired | Commercial business
Financing Receivable, Recorded Investment [Line Items]
Total loans	17,458	22,374
Commercial credit quality indicators | Acquired | Commercial business | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans	16,836	20,794
Commercial credit quality indicators | Acquired | Commercial business | Special mention
Financing Receivable, Recorded Investment [Line Items]
Total loans	86	598
Commercial credit quality indicators | Acquired | Commercial business | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans	536	982
Commercial credit quality indicators | Acquired | Commercial business | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total loans
Commercial credit quality indicators | Acquired | Commercial business | Loss
Financing Receivable, Recorded Investment [Line Items]
Total loans

Loans Receivable and Allowanc65

Loans Receivable and Allowance for Loan Losses - Summary of loan portfolio quality indicators by portfolio segment (Details 5) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Financing Receivable, Recorded Investment [Line Items]
Total loans	$ 1,365,939	$ 1,147,513
Real estate loans
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,148,492	972,925
Real estate loans | Residential
Financing Receivable, Recorded Investment [Line Items]
Total loans	181,310	177,184
Real estate loans | Commercial
Financing Receivable, Recorded Investment [Line Items]
Total loans	845,322	697,542
Real estate loans | Construction
Financing Receivable, Recorded Investment [Line Items]
Total loans	107,441	82,273
Real estate loans | Home equity
Financing Receivable, Recorded Investment [Line Items]
Total loans	14,419	15,926
Commercial business
Financing Receivable, Recorded Investment [Line Items]
Total loans	215,914	172,853
Consumer
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,533	1,735
Originated
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,295,711	1,058,819
Originated | Real estate loans
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,096,583	908,223
Originated | Real estate loans | Residential
Financing Receivable, Recorded Investment [Line Items]
Total loans	178,549	174,311
Originated | Real estate loans | Commercial
Financing Receivable, Recorded Investment [Line Items]
Total loans	802,156	643,524
Originated | Real estate loans | Construction
Financing Receivable, Recorded Investment [Line Items]
Total loans	107,329	81,242
Originated | Real estate loans | Home equity
Financing Receivable, Recorded Investment [Line Items]
Total loans	8,549	9,146
Originated | Commercial business
Financing Receivable, Recorded Investment [Line Items]
Total loans	198,456	150,479
Originated | Consumer
Financing Receivable, Recorded Investment [Line Items]
Total loans	672	117
Acquired
Financing Receivable, Recorded Investment [Line Items]
Total loans	70,228	88,694
Acquired | Real estate loans
Financing Receivable, Recorded Investment [Line Items]
Total loans	51,909	64,702
Acquired | Real estate loans | Residential
Financing Receivable, Recorded Investment [Line Items]
Total loans	2,761	2,873
Acquired | Real estate loans | Commercial
Financing Receivable, Recorded Investment [Line Items]
Total loans	43,166	54,018
Acquired | Real estate loans | Construction
Financing Receivable, Recorded Investment [Line Items]
Total loans	112	1,031
Acquired | Real estate loans | Home equity
Financing Receivable, Recorded Investment [Line Items]
Total loans	5,870	6,780
Acquired | Commercial business
Financing Receivable, Recorded Investment [Line Items]
Total loans	17,458	22,374
Acquired | Consumer
Financing Receivable, Recorded Investment [Line Items]
Total loans	861	1,618
Residential and Consumer credit quality indicators
Financing Receivable, Recorded Investment [Line Items]
Total loans	197,262	194,845
Residential and Consumer credit quality indicators | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans	194,064	192,277
Residential and Consumer credit quality indicators | Special mention
Financing Receivable, Recorded Investment [Line Items]
Total loans	265	944
Residential and Consumer credit quality indicators | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans	2,568	1,624
Residential and Consumer credit quality indicators | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total loans
Residential and Consumer credit quality indicators | Loss
Financing Receivable, Recorded Investment [Line Items]
Total loans	365
Residential and Consumer credit quality indicators | Real estate loans | Residential
Financing Receivable, Recorded Investment [Line Items]
Total loans	181,310	177,184
Residential and Consumer credit quality indicators | Real estate loans | Residential | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans	179,190	175,351
Residential and Consumer credit quality indicators | Real estate loans | Residential | Special mention
Financing Receivable, Recorded Investment [Line Items]
Total loans	196	864
Residential and Consumer credit quality indicators | Real estate loans | Residential | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,924	969
Residential and Consumer credit quality indicators | Real estate loans | Residential | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total loans
Residential and Consumer credit quality indicators | Real estate loans | Residential | Loss
Financing Receivable, Recorded Investment [Line Items]
Total loans
Residential and Consumer credit quality indicators | Real estate loans | Home equity
Financing Receivable, Recorded Investment [Line Items]
Total loans	14,419	15,926
Residential and Consumer credit quality indicators | Real estate loans | Home equity | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans	13,708	15,270
Residential and Consumer credit quality indicators | Real estate loans | Home equity | Special mention
Financing Receivable, Recorded Investment [Line Items]
Total loans	69	80
Residential and Consumer credit quality indicators | Real estate loans | Home equity | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans	642	576
Residential and Consumer credit quality indicators | Real estate loans | Home equity | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total loans
Residential and Consumer credit quality indicators | Real estate loans | Home equity | Loss
Financing Receivable, Recorded Investment [Line Items]
Total loans
Residential and Consumer credit quality indicators | Consumer
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,533	1,735
Residential and Consumer credit quality indicators | Consumer | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,166	1,656
Residential and Consumer credit quality indicators | Consumer | Special mention
Financing Receivable, Recorded Investment [Line Items]
Total loans
Residential and Consumer credit quality indicators | Consumer | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans	2	79
Residential and Consumer credit quality indicators | Consumer | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total loans
Residential and Consumer credit quality indicators | Consumer | Loss
Financing Receivable, Recorded Investment [Line Items]
Total loans	365
Residential and Consumer credit quality indicators | Originated
Financing Receivable, Recorded Investment [Line Items]
Total loans	187,770	183,574
Residential and Consumer credit quality indicators | Originated | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans	185,583	181,320
Residential and Consumer credit quality indicators | Originated | Special mention
Financing Receivable, Recorded Investment [Line Items]
Total loans	216	944
Residential and Consumer credit quality indicators | Originated | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,630	1,310
Residential and Consumer credit quality indicators | Originated | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total loans
Residential and Consumer credit quality indicators | Originated | Loss
Financing Receivable, Recorded Investment [Line Items]
Total loans	341
Residential and Consumer credit quality indicators | Originated | Real estate loans | Residential
Financing Receivable, Recorded Investment [Line Items]
Total loans	178,549	174,311
Residential and Consumer credit quality indicators | Originated | Real estate loans | Residential | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans	176,961	172,478
Residential and Consumer credit quality indicators | Originated | Real estate loans | Residential | Special mention
Financing Receivable, Recorded Investment [Line Items]
Total loans	147	864
Residential and Consumer credit quality indicators | Originated | Real estate loans | Residential | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,441	969
Residential and Consumer credit quality indicators | Originated | Real estate loans | Residential | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total loans
Residential and Consumer credit quality indicators | Originated | Real estate loans | Residential | Loss
Financing Receivable, Recorded Investment [Line Items]
Total loans
Residential and Consumer credit quality indicators | Originated | Real estate loans | Home equity
Financing Receivable, Recorded Investment [Line Items]
Total loans	8,549	9,146
Residential and Consumer credit quality indicators | Originated | Real estate loans | Home equity | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans	8,291	8,725
Residential and Consumer credit quality indicators | Originated | Real estate loans | Home equity | Special mention
Financing Receivable, Recorded Investment [Line Items]
Total loans	69	80
Residential and Consumer credit quality indicators | Originated | Real estate loans | Home equity | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans	189	341
Residential and Consumer credit quality indicators | Originated | Real estate loans | Home equity | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total loans
Residential and Consumer credit quality indicators | Originated | Real estate loans | Home equity | Loss
Financing Receivable, Recorded Investment [Line Items]
Total loans
Residential and Consumer credit quality indicators | Originated | Consumer
Financing Receivable, Recorded Investment [Line Items]
Total loans	672	117
Residential and Consumer credit quality indicators | Originated | Consumer | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans	331	117
Residential and Consumer credit quality indicators | Originated | Consumer | Special mention
Financing Receivable, Recorded Investment [Line Items]
Total loans
Residential and Consumer credit quality indicators | Originated | Consumer | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans
Residential and Consumer credit quality indicators | Originated | Consumer | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total loans
Residential and Consumer credit quality indicators | Originated | Consumer | Loss
Financing Receivable, Recorded Investment [Line Items]
Total loans	341
Residential and Consumer credit quality indicators | Acquired
Financing Receivable, Recorded Investment [Line Items]
Total loans	9,492	11,271
Residential and Consumer credit quality indicators | Acquired | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans	8,481	10,957
Residential and Consumer credit quality indicators | Acquired | Special mention
Financing Receivable, Recorded Investment [Line Items]
Total loans	49
Residential and Consumer credit quality indicators | Acquired | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans	938	314
Residential and Consumer credit quality indicators | Acquired | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total loans
Residential and Consumer credit quality indicators | Acquired | Loss
Financing Receivable, Recorded Investment [Line Items]
Total loans	24
Residential and Consumer credit quality indicators | Acquired | Real estate loans | Residential
Financing Receivable, Recorded Investment [Line Items]
Total loans	2,761	2,873
Residential and Consumer credit quality indicators | Acquired | Real estate loans | Residential | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans	2,229	2,873
Residential and Consumer credit quality indicators | Acquired | Real estate loans | Residential | Special mention
Financing Receivable, Recorded Investment [Line Items]
Total loans	49
Residential and Consumer credit quality indicators | Acquired | Real estate loans | Residential | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans	483
Residential and Consumer credit quality indicators | Acquired | Real estate loans | Residential | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total loans
Residential and Consumer credit quality indicators | Acquired | Real estate loans | Residential | Loss
Financing Receivable, Recorded Investment [Line Items]
Total loans
Residential and Consumer credit quality indicators | Acquired | Real estate loans | Home equity
Financing Receivable, Recorded Investment [Line Items]
Total loans	5,870	6,780
Residential and Consumer credit quality indicators | Acquired | Real estate loans | Home equity | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans	5,417	6,545
Residential and Consumer credit quality indicators | Acquired | Real estate loans | Home equity | Special mention
Financing Receivable, Recorded Investment [Line Items]
Total loans
Residential and Consumer credit quality indicators | Acquired | Real estate loans | Home equity | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans	453	235
Residential and Consumer credit quality indicators | Acquired | Real estate loans | Home equity | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total loans
Residential and Consumer credit quality indicators | Acquired | Real estate loans | Home equity | Loss
Financing Receivable, Recorded Investment [Line Items]
Total loans
Residential and Consumer credit quality indicators | Acquired | Consumer
Financing Receivable, Recorded Investment [Line Items]
Total loans	861	1,618
Residential and Consumer credit quality indicators | Acquired | Consumer | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans	835	1,539
Residential and Consumer credit quality indicators | Acquired | Consumer | Special mention
Financing Receivable, Recorded Investment [Line Items]
Total loans
Residential and Consumer credit quality indicators | Acquired | Consumer | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans	2	79
Residential and Consumer credit quality indicators | Acquired | Consumer | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total loans
Residential and Consumer credit quality indicators | Acquired | Consumer | Loss
Financing Receivable, Recorded Investment [Line Items]
Total loans	$ 24

Loans Receivable and Allowanc66

Loans Receivable and Allowance for Loan Losses - Summary of loan portfolio delinquencies by portfolio segment and amount (Details 6) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	$ 6,355	$ 5,799
Current	1,359,584	1,141,714
Carrying Amount > 90 Days and Accruing	1,365,939	1,147,513
31-60 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1,118	1,988
61-90 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	2,992	644
Greater Than 90 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	2,245	3,167
Originated
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	3,817	2,999
Current	1,291,894	1,055,820
Carrying Amount > 90 Days and Accruing	1,295,711	1,058,819
Originated | 31-60 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	147	1,276
Originated | 61-90 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	2,021	411
Originated | Greater Than 90 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1,649	1,312
Originated | Commercial business
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	378	1,521
Current	198,078	148,958
Carrying Amount > 90 Days and Accruing	198,456	150,479
Originated | Commercial business | 31-60 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		1,078
Originated | Commercial business | 61-90 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		100
Originated | Commercial business | Greater Than 90 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	378	343
Originated | Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due
Current	672	117
Carrying Amount > 90 Days and Accruing	672	117
Originated | Consumer | 31-60 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due
Originated | Consumer | 61-90 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due
Originated | Consumer | Greater Than 90 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due
Originated | Residential | Real estate loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	969	969
Current	177,580	173,342
Carrying Amount > 90 Days and Accruing	178,549	174,311
Originated | Residential | Real estate loans | 31-60 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due
Originated | Residential | Real estate loans | 61-90 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due
Originated | Residential | Real estate loans | Greater Than 90 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	969	969
Originated | Commercial | Real estate loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	2,297	311
Current	799,859	643,213
Carrying Amount > 90 Days and Accruing	802,156	643,524
Originated | Commercial | Real estate loans | 31-60 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	147
Originated | Commercial | Real estate loans | 61-90 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1,848	311
Originated | Commercial | Real estate loans | Greater Than 90 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	302
Originated | Construction | Real estate loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due
Current	107,329	81,242
Carrying Amount > 90 Days and Accruing	107,329	81,242
Originated | Construction | Real estate loans | 31-60 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due
Originated | Construction | Real estate loans | 61-90 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due
Originated | Construction | Real estate loans | Greater Than 90 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due
Originated | Home equity | Real estate loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	173	198
Current	8,376	8,948
Carrying Amount > 90 Days and Accruing	8,549	9,146
Originated | Home equity | Real estate loans | 31-60 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		198
Originated | Home equity | Real estate loans | 61-90 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	173
Originated | Home equity | Real estate loans | Greater Than 90 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due
Acquired
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	2,538	2,800
Current	67,690	85,894
Carrying Amount > 90 Days and Accruing	70,228	88,694
Acquired | 31-60 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	971	712
Acquired | 61-90 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	971	233
Acquired | Greater Than 90 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	596	1,855
Acquired | Commercial business
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	348	434
Current	17,110	21,940
Carrying Amount > 90 Days and Accruing	17,458	22,374
Acquired | Commercial business | 31-60 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	99	262
Acquired | Commercial business | 61-90 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	249	71
Acquired | Commercial business | Greater Than 90 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		101
Acquired | Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	6	17
Current	855	1,601
Carrying Amount > 90 Days and Accruing	861	1,618
Acquired | Consumer | 31-60 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	6	17
Acquired | Consumer | 61-90 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due
Acquired | Consumer | Greater Than 90 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due
Acquired | Residential | Real estate loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due
Current	2,761	2,873
Carrying Amount > 90 Days and Accruing	2,761	2,873
Acquired | Residential | Real estate loans | 31-60 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due
Acquired | Residential | Real estate loans | 61-90 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due
Acquired | Residential | Real estate loans | Greater Than 90 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due
Acquired | Commercial | Real estate loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1,731	1,095
Current	41,435	52,923
Carrying Amount > 90 Days and Accruing	43,166	54,018
Acquired | Commercial | Real estate loans | 31-60 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	866	333
Acquired | Commercial | Real estate loans | 61-90 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	722
Acquired | Commercial | Real estate loans | Greater Than 90 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	143	762
Acquired | Construction | Real estate loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		801
Current	112	230
Carrying Amount > 90 Days and Accruing	112	1,031
Acquired | Construction | Real estate loans | 31-60 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due
Acquired | Construction | Real estate loans | 61-90 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due
Acquired | Construction | Real estate loans | Greater Than 90 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		801
Acquired | Home equity | Real estate loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	453	453
Current	5,417	6,327
Carrying Amount > 90 Days and Accruing	5,870	6,780
Acquired | Home equity | Real estate loans | 31-60 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		100
Acquired | Home equity | Real estate loans | 61-90 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		162
Acquired | Home equity | Real estate loans | Greater Than 90 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	$ 453	$ 191

Loans Receivable and Allowanc67

Loans Receivable and Allowance for Loan Losses - Summary of nonaccrual loans by portfolio segment (Details 7) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total nonaccrual loans	$ 2,937	$ 3,791
Commercial business
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total nonaccrual loans	538	1,160
Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total nonaccrual loans	341	2
Residential | Real estate loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total nonaccrual loans	969	970
Commercial | Real estate loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total nonaccrual loans	446	1,264
Home equity | Real estate loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total nonaccrual loans	$ 643	$ 395

Loans Receivable and Allowanc68

Loans Receivable and Allowance for Loan Losses - Summary of impaired loans (Details 8) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Originated
Impaired loans without a valuation allowance:
Impaired loans without a valuation allowance, Carrying Amount	$ 2,430	$ 7,033	$ 6,643
Impaired loans without a valuation allowance, Unpaid Principal Balance	2,473	7,056	6,652
Impaired loans without a valuation allowance, Average Carrying Amount	2,891	7,084	6,219
Impaired loans without a valuation allowance, Interest Income Recognized	115	210	306
Impaired loans with a valuation allowance:
Impaired loans with a valuation allowance, Carrying Amount	833	1,490	1,009
Impaired loans with a valuation allowance, Unpaid Principal Balance	833	1,554	1,009
Impaired loans with a valuation allowance, Associated Allowance	347	73	33
Impaired loans with a valuation allowance, Average Carrying Amount	886	1,537	1,053
Impaired loans with a valuation allowance, Interest Income Recognized	28	62	61
Total impaired loans
Total impaired loans, Carrying Amount	3,263	8,523	7,652
Total impaired loans, Unpaid Principal Balance	3,306	8,610	7,661
Total impaired loans, Associated Allowance	347	73	33
Total impaired loans, Average Carrying Amount	3,777	8,621	7,272
Total impaired loans, Interest Income Recognized	143	272	367
Originated | Commercial business
Impaired loans without a valuation allowance:
Impaired loans without a valuation allowance, Carrying Amount	551	1,351	1,145
Impaired loans without a valuation allowance, Unpaid Principal Balance	584	1,372	1,153
Impaired loans without a valuation allowance, Average Carrying Amount	987	1,374	1,226
Impaired loans without a valuation allowance, Interest Income Recognized	76	49	52
Impaired loans with a valuation allowance:
Impaired loans with a valuation allowance, Carrying Amount	369	626	556
Impaired loans with a valuation allowance, Unpaid Principal Balance	369	690	556
Impaired loans with a valuation allowance, Associated Allowance	5	71	10
Impaired loans with a valuation allowance, Average Carrying Amount	417	673	596
Impaired loans with a valuation allowance, Interest Income Recognized	22	34	32
Originated | Consumer
Impaired loans with a valuation allowance:
Impaired loans with a valuation allowance, Carrying Amount	341
Impaired loans with a valuation allowance, Unpaid Principal Balance	341
Impaired loans with a valuation allowance, Associated Allowance	341
Impaired loans with a valuation allowance, Average Carrying Amount	341
Impaired loans with a valuation allowance, Interest Income Recognized
Originated | Residential | Real estate loans
Impaired loans without a valuation allowance:
Impaired loans without a valuation allowance, Carrying Amount	969	969	864
Impaired loans without a valuation allowance, Unpaid Principal Balance	969	969	864
Impaired loans without a valuation allowance, Average Carrying Amount	969	973	864
Impaired loans without a valuation allowance, Interest Income Recognized		27	28
Impaired loans with a valuation allowance:
Impaired loans with a valuation allowance, Carrying Amount		864
Impaired loans with a valuation allowance, Unpaid Principal Balance		864
Impaired loans with a valuation allowance, Associated Allowance		2
Impaired loans with a valuation allowance, Average Carrying Amount		864
Impaired loans with a valuation allowance, Interest Income Recognized		28
Originated | Commercial | Real estate loans
Impaired loans without a valuation allowance:
Impaired loans without a valuation allowance, Carrying Amount	651	4,291	4,543
Impaired loans without a valuation allowance, Unpaid Principal Balance	651	4,291	4,544
Impaired loans without a valuation allowance, Average Carrying Amount	668	4,308	4,034
Impaired loans without a valuation allowance, Interest Income Recognized	29	124	223
Impaired loans with a valuation allowance:
Impaired loans with a valuation allowance, Carrying Amount	123		453
Impaired loans with a valuation allowance, Unpaid Principal Balance	123		453
Impaired loans with a valuation allowance, Associated Allowance	1		23
Impaired loans with a valuation allowance, Average Carrying Amount	128		457
Impaired loans with a valuation allowance, Interest Income Recognized	6		29
Originated | Home equity | Real estate loans
Impaired loans without a valuation allowance:
Impaired loans without a valuation allowance, Carrying Amount	259	422	91
Impaired loans without a valuation allowance, Unpaid Principal Balance	269	424	91
Impaired loans without a valuation allowance, Average Carrying Amount	267	429	95
Impaired loans without a valuation allowance, Interest Income Recognized	10	10	3
Acquired
Impaired loans without a valuation allowance:
Impaired loans without a valuation allowance, Carrying Amount	1,025	1,771	629
Impaired loans without a valuation allowance, Unpaid Principal Balance	1,055	1,841	629
Impaired loans without a valuation allowance, Average Carrying Amount	1,085	1,799	607
Impaired loans without a valuation allowance, Interest Income Recognized	45	62	28
Impaired loans with a valuation allowance:
Impaired loans with a valuation allowance, Carrying Amount	561	628
Impaired loans with a valuation allowance, Unpaid Principal Balance	561	638
Impaired loans with a valuation allowance, Associated Allowance	71	38
Impaired loans with a valuation allowance, Average Carrying Amount	577	664
Impaired loans with a valuation allowance, Interest Income Recognized	19	18
Total impaired loans
Total impaired loans, Carrying Amount	1,586	2,399	629
Total impaired loans, Unpaid Principal Balance	1,616	2,479	629
Total impaired loans, Associated Allowance	71	38
Total impaired loans, Average Carrying Amount	1,662	2,463	607
Total impaired loans, Interest Income Recognized	64	80	28
Acquired | Commercial business
Impaired loans without a valuation allowance:
Impaired loans without a valuation allowance, Carrying Amount	572	963	629
Impaired loans without a valuation allowance, Unpaid Principal Balance	593	963	629
Impaired loans without a valuation allowance, Average Carrying Amount	629	999	607
Impaired loans without a valuation allowance, Interest Income Recognized	36	54	$ 28
Impaired loans with a valuation allowance:
Impaired loans with a valuation allowance, Carrying Amount	390	470
Impaired loans with a valuation allowance, Unpaid Principal Balance	390	480
Impaired loans with a valuation allowance, Associated Allowance	37	21
Impaired loans with a valuation allowance, Average Carrying Amount	406	506
Impaired loans with a valuation allowance, Interest Income Recognized	19	14
Acquired | Consumer
Impaired loans with a valuation allowance:
Impaired loans with a valuation allowance, Carrying Amount	27	7
Impaired loans with a valuation allowance, Unpaid Principal Balance	27	7
Impaired loans with a valuation allowance, Associated Allowance	27	5
Impaired loans with a valuation allowance, Average Carrying Amount	27	7
Impaired loans with a valuation allowance, Interest Income Recognized		1
Acquired | Commercial | Real estate loans
Impaired loans without a valuation allowance:
Impaired loans without a valuation allowance, Carrying Amount		611
Impaired loans without a valuation allowance, Unpaid Principal Balance		678
Impaired loans without a valuation allowance, Average Carrying Amount		602
Impaired loans without a valuation allowance, Interest Income Recognized		6
Impaired loans with a valuation allowance:
Impaired loans with a valuation allowance, Carrying Amount	144	151
Impaired loans with a valuation allowance, Unpaid Principal Balance	144	151
Impaired loans with a valuation allowance, Associated Allowance	7	12
Impaired loans with a valuation allowance, Average Carrying Amount	144	151
Impaired loans with a valuation allowance, Interest Income Recognized		3
Acquired | Home equity | Real estate loans
Impaired loans without a valuation allowance:
Impaired loans without a valuation allowance, Carrying Amount	453	197
Impaired loans without a valuation allowance, Unpaid Principal Balance	462	200
Impaired loans without a valuation allowance, Average Carrying Amount	456	198
Impaired loans without a valuation allowance, Interest Income Recognized	$ 9	$ 2

Loans Receivable and Allowanc69

Loans Receivable and Allowance for Loan Losses - Summary of loans whose terms were modified as TDRs (Details 9) $ in Thousands	12 Months Ended
	Dec. 31, 2016USD ($)Loan	Dec. 31, 2015USD ($)Loan	Dec. 31, 2014USD ($)Loan
Financing Receivable, Modifications [Line Items]
Number of Loans | Loan	3	4	6
Outstanding Recorded Investment Pre-Modification	$ 299	$ 4,083	$ 2,099
Outstanding Recorded Investment Post-Modification	$ 299	$ 4,083	$ 2,099
Commercial business
Financing Receivable, Modifications [Line Items]
Number of Loans | Loan	2	1	4
Outstanding Recorded Investment Pre-Modification	$ 237	$ 39	$ 782
Outstanding Recorded Investment Post-Modification	$ 237	$ 39	$ 782
Commercial | Real estate loans
Financing Receivable, Modifications [Line Items]
Number of Loans | Loan	1	3	2
Outstanding Recorded Investment Pre-Modification	$ 62	$ 4,044	$ 1,317
Outstanding Recorded Investment Post-Modification	$ 62	$ 4,044	$ 1,317

Loans Receivable and Allowanc70

Loans Receivable and Allowance for Loan Losses - Summary of loans were modified as TDR (Details 10) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable, Gross, Allowance, and Net [Abstract]
Maturity Concession	$ 299
Maturity/amortization concession		825	946
Maturity and payment concession		3,258
Payment concession			1,153
Total	$ 299	$ 4,083	$ 2,099

Loans Receivable and Allowanc71

Loans Receivable and Allowance for Loan Losses (Detail Textuals) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Loans and Leases Receivable Disclosure [Line Items]
Percentage of market value of the collateral	80.00%
Maximum percent of the loan in comparison with original appraised value of the property	80.00%
Delinquent loans greater than 90 days and still accruing		$ 1,100
Income contractually due but not recognized on originated nonaccrual loans	$ 17	25	$ 8
Actual interest income recognized	74	43	$ 190
Commitment to lend additional funds to any borrower on nonaccrual status	0	169
Recorded investment in TDR	1,400	7,300
TDR on non accrual status	$ 66	$ 1,100
Real estate loans | Residential
Loans and Leases Receivable Disclosure [Line Items]
Private mortgage percentage of appraised value property	80.00%
Real estate loans | Home equity
Loans and Leases Receivable Disclosure [Line Items]
Private mortgage percentage of appraised value property	80.00%
Minimum
Loans and Leases Receivable Disclosure [Line Items]
Private mortgage percentage of appraised value property	80.00%

Premises and Equipment (Details

Premises and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	$ 27,327	$ 18,926
Accumulated depreciation and amortization	(9,492)	(7,763)
Premises and equipment, net	17,835	11,163
Land
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	2,300	2,300
Building
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	14,061	6,384
Leasehold improvements
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	4,532	4,544
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	2,118	1,964
Equipment
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	4,249	3,734
Automobiles
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	$ 67

Premises and Equipment (Detail

Premises and Equipment (Detail Textuals) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Property, Plant and Equipment [Abstract]
Depreciation and amortization expense	$ 1,729	$ 1,685	$ 1,239

Deposits - Components of deposi

Deposits - Components of deposits (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Deposits [Abstract]
Noninterest bearing demand deposit accounts	$ 187,593	$ 164,553
Interest bearing accounts:
NOW and money market	402,982	347,846
Savings	96,601	97,846
Time certificates of deposit	601,861	436,697
Total interest bearing accounts	1,101,444	882,389
Total deposits	$ 1,289,037	$ 1,046,942

Deposits - Contractual maturiti

Deposits - Contractual maturities of time certificates of deposit (Details 1) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Deposits [Abstract]
2,016		$ 238,673
2,017	$ 323,742	152,682
2,018	247,517	35,186
2,019	29,778	9,810
2,020	433	346
2,021	391
Total time certificates of deposit	$ 601,861	$ 436,697

Deposits - Interest expense by

Deposits - Interest expense by account type (Details 2) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Deposits [Abstract]
NOW and money market	$ 1,945	$ 1,473	$ 894
Savings	315	693	302
Time certificates of deposit	6,040	3,515	2,099
Total interest expense on deposits	$ 8,300	$ 5,681	$ 3,295

Deposits (Detail textuals)

Deposits (Detail textuals) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Deposits [Abstract]
Individual certificate with balances of $250,000 or more	$ 148.5	$ 98.2
Brokered deposits	$ 58.2	$ 55.6

Federal Loan Bank Advances an78

Federal Loan Bank Advances and Other Borrowings - Summary of FHLB advances with maturity dates and weighted average rates (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Year of Maturity: Amount Due
2,016		$ 75,000
2,017	135,000	20,000
2,020	25,000	25,000
Total advances Amount Due	$ 160,000	$ 120,000
Year of Maturity: Weighted Average Rate
2,016		0.46%
2,017	0.73%	0.99%
2,020	1.99%	1.99%
Total advances Weighted Average Rate	0.92%	0.87%

Federal Loan Bank Advances an79

Federal Loan Bank Advances and Other Borrowings (Detail Textuals) - USD ($) $ / shares in Units, $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
FHLB
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
FHLB advances subject to interest rate swap	$ 100,000
FHLB advances, immediate availability to borrow	$ 331,400
Number of FHLB shares owned	79,430	65,536
Par value of shares owned	$ 100	$ 100
FHLB | Secured line of credit
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Pre approved secured line of credit	$ 450	$ 450
Bankers' Bank Northeast | Unsecured line of credit
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Unsecured line of credit	$ 7,500	$ 7,500

Subordinated Debentures (Detail

Subordinated Debentures (Detail Textuals) - Fixed rated subordinated notes $ in Millions	1 Months Ended
	Aug. 19, 2015USD ($)
Debt Instrument [Line Items]
Aggregate principal amount	$ 25.5
Notes non-callable term (in years)	5 years
Stated maturity date of notes	Aug. 15, 2025
Quarterly pay fixed interest rate of notes	5.75%

Commitments and Contingencies -

Commitments and Contingencies - Commitments to extend credit (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Outstanding commitments	$ 168,434	$ 153,413
Loan commitments
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Outstanding commitments	89,825	77,181
Undisbursed construction loans
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Outstanding commitments	70,526	66,974
Unused home equity lines of credit
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Outstanding commitments	$ 8,083	$ 9,258

Commitments and Contingencies82

Commitments and Contingencies (Detail Textuals) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Commitments and Contingencies Disclosure [Abstract]
Future lease obligations	$ 19,200	$ 8,200
Term of lease contract	98 years 11 months
Current lease payment	$ 120
Rental expenses	$ 2,000	$ 1,800	$ 1,600

Income Taxes - Income tax expen

Income Taxes - Income tax expense (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Current provision:
Federal									$ 6,838	$ 5,113	$ 2,147
State									226	694	718
Total current									7,064	5,807	2,865
Deferred provision:
Federal									(1,104)	(1,749)	(557)
State										783	(139)
Total deferred									(1,104)	(966)	(696)
Total income tax expense	$ 1,850	$ 1,437	$ 1,320	$ 1,353	$ 1,423	$ 1,228	$ 1,275	$ 915	$ 5,960	$ 4,841	$ 2,169

Income Taxes - Reconciliation o

Income Taxes - Reconciliation of income tax expense (Details 1) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Income tax expense at statutory federal rate									$ 6,409	$ 4,855	$ 2,291
State tax expense, net of federal tax effect									147	566	259
Statutory rate reductions										811
Income exempt from tax									(687)	(627)	(523)
Other items, net									91	42	19
Income tax expense before change in valuation allowance									5,960	5,647	2,046
Change in valuation allowance										(806)	123
Total income tax expense	$ 1,850	$ 1,437	$ 1,320	$ 1,353	$ 1,423	$ 1,228	$ 1,275	$ 915	$ 5,960	$ 4,841	$ 2,169

Income Taxes - Components of de

Income Taxes - Components of deferred tax assets and liabilities (Details 2) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Deferred tax assets:
Allowance for loan losses	$ 6,378	$ 5,086
Net operating loss carryforwards	996	1,162
Purchase accounting adjustments	20	228
Deferred fees	1,437	1,262
Deferred expenses	716	767
Start-up costs	275	317
Unrealized loss on derivatives		96
Depreciation		82
Other	192	201
Gross deferred tax assets	10,014	9,201
Deferred tax liabilities:
Tax bad debt reserve	195	645
Depreciation	255
Unrealized gain on derivatives	258
Unrealized gain on available for sale securities	221	219
Gross deferred tax liabilities	929	864
Net deferred tax asset	$ 9,085	$ 8,337

Income Taxes (Detail textuals)

Income Taxes (Detail textuals) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Operating Loss Carryforwards [Line Items]
Statutory federal income tax rate	35.00%	35.00%	35.00%
Federal
Operating Loss Carryforwards [Line Items]
Operating loss carryovers	$ 2,800
Operating loss carryforward annual limitations	$ 176

401(k) Profit Sharing Plan (Det

401(k) Profit Sharing Plan (Detail Textuals) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Compensation and Retirement Disclosure [Abstract]
Profit sharing plan age of covered employee	21 years
Vesting period for employer under defined contribution plan	5 years
Profit sharing plan contribution amount	$ 227	$ 173	$ 151

Earnings per Share - Reconcilia

Earnings per Share - Reconciliation of earnings available to common stockholders and basic weighted-average common shares outstanding to diluted weighted average common shares outstanding (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Earnings Per Share [Abstract]
Net income	$ 3,323	$ 3,140	$ 2,896	$ 2,991	$ 2,618	$ 2,253	$ 2,286	$ 1,873	$ 12,350	$ 9,030	$ 4,568
Preferred stock dividends										(125)	(110)
Dividends to participating securities									(27)	(5)
Undistributed earnings allocated to participating securities									(211)	(226)	(81)
Net income for earnings per share calculation									$ 12,112	$ 8,674	$ 4,377
Weighted average shares outstanding, basic (in shares)									7,396,019	7,071,550	5,577,942
Effect of dilutive equity-based awards (in shares)									95,000	69,000	28,000
Weighted average shares outstanding, diluted (in shares)									7,491,052	7,140,558	5,605,512
Net earnings per common share:
Basic earnings per common share (in dollars per share)	$ 0.44	$ 0.42	$ 0.38	$ 0.40	$ 0.35	$ 0.31	$ 0.31	$ 0.26	$ 1.64	$ 1.23	$ 0.78
Diluted earnings per common share (in dollars per share)	$ 0.43	$ 0.41	$ 0.38	$ 0.40	$ 0.35	$ 0.31	$ 0.31	$ 0.26	$ 1.62	$ 1.21	$ 0.78

Stock Based Compensation Plan89

Stock Based Compensation Plans - Outstanding stock options (Details) - Employee Stock Option	12 Months Ended
	Dec. 31, 2016$ / sharesshares
Number of Shares
Options outstanding at beginning of period | shares	195,928
Exercised | shares	(64,120)
Expired | shares	(10,820)
Options outstanding at end of period | shares	120,988
Options exercisable at end of period | shares	119,538
Weighted Average Exercise Price
Options outstanding at beginning of period | $ / shares	$ 18.07
Exercised | $ / shares	17.15
Expired | $ / shares	17.85
Options outstanding at end of period | $ / shares	18.58
Options exercisable at end of period | $ / shares	$ 18.62

Stock Based Compensation Plan90

Stock Based Compensation Plans - Activity for restricted stock (Details 1)	12 Months Ended
	Dec. 31, 2016$ / sharesshares
Number of Shares
Unvested at beginning of period | shares	143,325
Granted | shares	29,933
Vested | shares	(75,781)
Forfeited | shares	(883)
Unvested at end of period | shares	96,594
Weighted Average Grant Date Fair Value
Unvested at beginning of period | $ / shares	$ 15.92
Granted | $ / shares	22.45
Vested | $ / shares	16.66
Forfeited | $ / shares	20.39
Unvested at end of period | $ / shares	$ 19.80

Stock Based Compensation Plan91

Stock Based Compensation Plans (Detail Textuals) $ in Thousands	Dec. 09, 2014	Dec. 31, 2016USD ($)Planshares	Dec. 31, 2015USD ($)	Dec. 31, 2014USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of equity award plans | Plan		5
Employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based payment award, vesting period		5 years
Share based compensation expenses		$ 9	$ 14	$ 32
Total intrinsic value of share options exercised		597	170	214
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based compensation expenses		$ 1,200	1,000	542
Restricted Stock | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based payment award, vesting period		1 year
Restricted Stock | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based payment award, vesting period		5 years
2012 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of common stock reserved for issuance | shares		480,372
2012 Plan | Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based payment award, vesting period	5 years
Share based compensation expenses		$ 304	$ 134	$ 14

Stock Based Compensation Plan92

Stock Based Compensation Plans (Detail Textuals 1) - Market Conditions Restricted Stock - USD ($) $ / shares in Units, $ in Thousands	Dec. 09, 2014	Jan. 31, 2016	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based compensation expenses			$ 1,200	$ 1,000	$ 542
Share based compensation plan modification description and terms		The total shares originally granted for the $29.00 price target have been modified to a time based restricted stock grant. The shares will vest over a four year period with the first installment vesting on December 1, 2016 and the remaining shares to vest on each annual anniversary thereafter. In addition, the shares originally granted for the $25.00 and $27.00 price targets have been modified. These shares vest over a period from the date of the modification to December 1, 2019 based on meeting the price targets.
Maximum time for price target		30 days
Method used to measure share awards		Monte Carlo simulation model
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based payment award, vesting period			5 years
2012 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based payment award, vesting period	5 years
Grant date fair value for shares granted	$ 18.99
Share based compensation expenses			$ 304	$ 134	$ 14
Incremental cost		$ 13.66
2012 Plan | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vested or expected to vest	49,400
2012 Plan | Stock price $25.00
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share price	$ 25
Grant date fair value for shares granted	11.63
Incremental cost		2.19
2012 Plan | Stock price $27.00
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share price	27
Grant date fair value for shares granted	10.30
Incremental cost		$ 2.03
2012 Plan | Stock price $29.00
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share price	29
Grant date fair value for shares granted	$ 9.10

Comprehensive Income - Summary

Comprehensive Income - Summary of changes in accumulated other comprehensive income (loss) by component, net of tax (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Accumulated Other Comprehensive Income Loss [Roll Forward]
Balance	$ 227	$ 531	$ 424
Other comprehensive income (loss) before reclassifications	550	(304)	107
Amounts reclassified from accumulated other comprehensive income	113
Net other comprehensive income (loss)	663	(304)	107
Balance	890	227	531
Net Unrealized Gain (Loss) on Available for Sale Securities
Accumulated Other Comprehensive Income Loss [Roll Forward]
Balance	405	644	424
Other comprehensive income (loss) before reclassifications	(109)	(239)	220
Amounts reclassified from accumulated other comprehensive income	113
Net other comprehensive income (loss)	4	(239)	220
Balance	409	405	644
Net Unrealized Gain (Loss) on Interest Rate Swap
Accumulated Other Comprehensive Income Loss [Roll Forward]
Balance	(178)	(113)
Other comprehensive income (loss) before reclassifications	659	(65)	(113)
Amounts reclassified from accumulated other comprehensive income
Net other comprehensive income (loss)	659	(65)	(113)
Balance	$ 481	$ (178)	$ (113)

Derivative Instruments - Inform

Derivative Instruments - Information about derivative instruments (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Cash flow hedge:
Fair Value	$ 737	$ (276)
Cash flow hedge | Interest rate swap on FHLB advance
Cash flow hedge:
Notional Amount	$ 25,000	$ 25,000
Original Maturity	4 years 8 months 12 days	4 years 8 months 12 days
Received	3-month LIBOR	3-month LIBOR
Paid	1.62%	1.62%
Fair Value	$ (91)	$ (181)
Cash flow hedge | Interest rate swap on FHLB advance
Cash flow hedge:
Notional Amount	$ 25,000	$ 25,000
Original Maturity	5 years	5 years
Received	3-month LIBOR	3-month LIBOR
Paid	1.83%	1.83%
Fair Value	$ (138)	$ (276)
Cash flow hedge | Interest rate swap on FHLB advance
Cash flow hedge:
Notional Amount	$ 25,000	$ 25,000
Original Maturity	5 years	5 years
Received	3-month LIBOR	3-month LIBOR
Paid	1.48%	1.48%
Fair Value	$ 249	$ 181
Cash flow hedge | Interest rate swap on FHLB advance
Cash flow hedge:
Notional Amount	$ 25,000
Original Maturity	5 years
Received	3-month LIBOR
Paid	1.22%
Fair Value	$ 717

Derivative Instruments - Forwar

Derivative Instruments - Forward starting interest rate swap transactions (Details 1) - Interest rate swap - Cash flow hedge - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Derivative [Line Items]
Notional Amount	$ 25,000	$ 25,000
Duration of Borrowing	4 years 8 months 12 days	4 years 8 months 12 days
FHLB 90-day advance | April 1, 2014
Derivative [Line Items]
Notional Amount	$ 25,000
Effective Date of Hedged Borrowing	Apr. 1, 2014
Duration of Borrowing	4 years 8 months 12 days
Counterparty	Bank of Montreal
FHLB 90-day advance | January 2, 2015
Derivative [Line Items]
Notional Amount	$ 25,000
Effective Date of Hedged Borrowing	Jan. 2, 2015
Duration of Borrowing	5 years
Counterparty	Bank of Montreal
FHLB 90-day advance | August 26, 2015
Derivative [Line Items]
Notional Amount	$ 25,000
Effective Date of Hedged Borrowing	Aug. 26, 2015
Duration of Borrowing	5 years
Counterparty	Bank of Montreal
FHLB 90-day advance | July 1, 2016
Derivative [Line Items]
Notional Amount	$ 25,000
Effective Date of Hedged Borrowing	Jul. 1, 2016
Duration of Borrowing	5 years
Counterparty	Bank of Montreal

Derivative Instruments - Change

Derivative Instruments - Changes in consolidated statements of comprehensive income related to interest rate derivatives (Details 2) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Interest rate swap on FHLB advance:
Unrealized gain (loss) recognized in accumulated other comprehensive income	$ 1,013	$ (89)	$ (186)
Income tax (expense) benefit on items recognized in accumulated other comprehensive income	(354)	24	73
Other comprehensive income (loss)	659	(65)	$ (113)
Amount recognized in interest expense on hedged FHLB advance	$ 1,386	$ 991

Fair Value of Financial Instr97

Fair Value of Financial Instruments - Carrying values and fair values of financial instruments (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Financial Assets:
Federal funds sold	$ 329	$ 39,035
Available for sale securities	87,751	40,581
Held to maturity securities	16,859	10,226
Carrying Value
Financial Assets:
Cash and due from banks	96,026	49,562
Federal funds sold	329	39,035
Available for sale securities	87,751	40,581
Held to maturity securities	16,859	10,226
Loans held for sale	254
Loans receivable, net	1,343,895	1,129,748
Accrued interest receivable	4,958	4,071
FHLB stock	7,943	6,554
Derivative asset	737
Financial Liabilities:
Demand deposits	187,593	164,553
NOW and money market	402,982	347,846
Savings	96,601	97,846
Time deposits	601,861	436,697
Advances from the FHLB	160,000	120,000
Subordinated debentures	25,051	25,000
Derivative liability		276
Fair Value
Financial Assets:
Cash and due from banks	96,026	49,562
Federal funds sold	329	39,035
Available for sale securities	87,751	40,581
Held to maturity securities	16,851	10,228
Loans held for sale	254
Loans receivable, net	1,339,055	1,135,227
Accrued interest receivable	4,958	4,071
FHLB stock	7,943	6,554
Derivative asset	737
Financial Liabilities:
Demand deposits	187,593	164,553
NOW and money market	402,982	347,846
Savings	96,601	97,846
Time deposits	603,456	438,214
Advances from the FHLB	160,118	120,025
Subordinated debentures	25,645	24,505
Derivative liability		276
Level 1
Financial Assets:
Cash and due from banks	96,026	49,562
Federal funds sold	329	39,035
Available for sale securities
Held to maturity securities
Loans held for sale
Loans receivable, net
Accrued interest receivable
FHLB stock
Derivative asset
Financial Liabilities:
Demand deposits
NOW and money market
Savings
Time deposits
Advances from the FHLB
Subordinated debentures
Derivative liability
Level 2
Financial Assets:
Cash and due from banks
Federal funds sold
Available for sale securities	87,751	40,581
Held to maturity securities	16,851	10,228
Loans held for sale	254
Loans receivable, net
Accrued interest receivable
FHLB stock
Derivative asset	737
Financial Liabilities:
Demand deposits
NOW and money market
Savings
Time deposits
Advances from the FHLB
Subordinated debentures
Derivative liability		276
Level 3
Financial Assets:
Cash and due from banks
Federal funds sold
Available for sale securities
Held to maturity securities
Loans held for sale
Loans receivable, net	1,339,055	1,135,227
Accrued interest receivable	4,958	4,071
FHLB stock	7,943	6,554
Derivative asset
Financial Liabilities:
Demand deposits	187,593	164,553
NOW and money market	402,982	347,846
Savings	96,601	97,846
Time deposits	603,456	438,214
Advances from the FHLB	160,118	120,025
Subordinated debentures	$ 25,645	24,505
Derivative liability

Fair Value Measurements - Finan

Fair Value Measurements - Financial instruments carried at fair value on recurring basis (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Available-for-sale investment securities:
Available for sale securities	$ 87,751	$ 40,581
Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative asset
Derivative liability
Available-for-sale investment securities:
Available for sale securities
Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative asset	737
Derivative liability		276
Available-for-sale investment securities:
Available for sale securities	87,751	40,581
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative asset
Derivative liability
Available-for-sale investment securities:
Available for sale securities
Fair Value Measurements Recurring | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative asset
Derivative liability
Fair Value Measurements Recurring | Level 1 | U.S. Government and agency obligations
Available-for-sale investment securities:
Available for sale securities
Fair Value Measurements Recurring | Level 1 | State agency, U.S. Territories and municipal obligations
Available-for-sale investment securities:
Available for sale securities
Fair Value Measurements Recurring | Level 1 | Corporate bonds
Available-for-sale investment securities:
Available for sale securities
Fair Value Measurements Recurring | Level 1 | Mortgage backed securities
Available-for-sale investment securities:
Available for sale securities
Fair Value Measurements Recurring | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative asset	737
Derivative liability		(276)
Fair Value Measurements Recurring | Level 2 | U.S. Government and agency obligations
Available-for-sale investment securities:
Available for sale securities	62,698	7,143
Fair Value Measurements Recurring | Level 2 | State agency, U.S. Territories and municipal obligations
Available-for-sale investment securities:
Available for sale securities	14,763	17,504
Fair Value Measurements Recurring | Level 2 | Corporate bonds
Available-for-sale investment securities:
Available for sale securities	10,290	11,437
Fair Value Measurements Recurring | Level 2 | Mortgage backed securities
Available-for-sale investment securities:
Available for sale securities		4,497
Fair Value Measurements Recurring | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative asset
Derivative liability
Fair Value Measurements Recurring | Level 3 | U.S. Government and agency obligations
Available-for-sale investment securities:
Available for sale securities
Fair Value Measurements Recurring | Level 3 | State agency, U.S. Territories and municipal obligations
Available-for-sale investment securities:
Available for sale securities
Fair Value Measurements Recurring | Level 3 | Corporate bonds
Available-for-sale investment securities:
Available for sale securities
Fair Value Measurements Recurring | Level 3 | Mortgage backed securities
Available-for-sale investment securities:
Available for sale securities

Fair Value Measurements - Fin99

Fair Value Measurements - Financial instruments carried at fair value on nonrecurring basis (Details 1) - Fair Value Measurements Nonrecurring - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans
Foreclosed real estate
Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans
Foreclosed real estate
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans	4,849	10,922
Foreclosed real estate	$ 272	$ 1,248

Fair Value Measurements - Quant

Fair Value Measurements - Quantitative inputs and assumptions for Level 3 financial instruments carried at fair value on nonrecurring basis (Details 2) - Level 3 - Fair Value Measurements Nonrecurring - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans	$ 4,849	$ 10,922
Foreclosed real estate	272	1,248
Impaired loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans	$ 4,849	$ 10,922
Valuation Methodology, Appraisals	Appraisals	Appraisals
Valuation Methodology, Discounted cash flows	Discounted cash flows	Discounted cash flows
Impaired loans | Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Unobservable Input, Discount to appraised value	8.00%	8.00%
Unobservable Input, Discount rate	4.25%	3.25%
Impaired loans | Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Unobservable Input, Discount to appraised value	28.00%	10.00%
Unobservable Input, Discount rate	6.25%	7.00%
Foreclosed real estate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreclosed real estate	$ 272	$ 1,248
Valuation Methodology, Appraisals	Appraisals	Appraisals
Unobservable Input, Discount to appraised value	20.00%
Foreclosed real estate | Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Unobservable Input, Discount to appraised value		10.00%
Foreclosed real estate | Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Unobservable Input, Discount to appraised value		25.00%

Regulatory Matters - Capital am

Regulatory Matters - Capital amounts and ratios for Bank (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Bankwell Bank
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Common Equity Tier 1 Capital to Risk-Weighted Assets, Actual Capital, Amount	$ 157,604	$ 142,651
Common Equity Tier 1 Capital to Risk-Weighted Assets, Actual Capital, Ratio	11.59%	12.18%
Common Equity Tier 1 Capital to Risk-Weighted Assets,For Capital Adequacy Purposes, Amount	$ 61,168	$ 52,709
Common Equity Tier 1 Capital to Risk-Weighted Assets,For Capital Adequacy Purposes, Ratio	4.50%	4.50%
Common Equity Tier 1 Capital to Risk-Weighted Assets, To be Well Capitalized Under Prompt Corrective Action Provisions, Amount	$ 88,353	$ 76,135
Common Equity Tier 1 Capital to Risk-Weighted Assets, To be Well Capitalized Under Prompt Corrective Action Provisions, Ratio	6.50%	6.50%
Total Capital to Risk-Weighted Assets, Actual Capital, Amount	$ 174,610	$ 156,820
Total Capital to Risk-Weighted Assets, Actual Capital, Ratio	12.85%	13.39%
Total Capital to Risk-Weighted Assets, For Capital Adequacy Purposes, Amount	$ 108,742	$ 93,705
Total Capital to Risk-Weighted Assets, For Capital Adequacy Purposes, Ratio	8.00%	8.00%
Total Capital to Risk-Weighted Assets, To be Well Capitalized Under Prompt Corrective Action Provisions, Amount	$ 135,928	$ 117,131
Total Capital to Risk-Weighted Assets, To be Well Capitalized Under Prompt Corrective Action Provisions, Ratio	10.00%	10.00%
Tier I Capital to Risk-Weighted Assets, Actual Capital, Amount	$ 157,604	$ 142,651
Tier I Capital to Risk-Weighted Assets, Actual Capital, Ratio	11.59%	12.18%
Tier I Capital to Risk-Weighted Assets, For Capital Adequacy Purposes, Amount	$ 81,557	$ 70,279
Tier I Capital to Risk-Weighted Assets, For Capital Adequacy Purposes, Ratio	6.00%	6.00%
Tier I Capital to Risk-Weighted Assets, To be Well Capitalized Under Prompt Corrective Action Provisions, Amount	$ 108,742	$ 93,705
Tier I Capital to Risk-Weighted Assets, To be Well Capitalized Under Prompt Corrective Action Provisions, Ratio	8.00%	8.00%
Tier I Capital to Average Assets, Actual Capital, Amount	$ 157,604	$ 142,651
Tier I Capital to Average Assets, Actual Capital, Ratio	10.10%	10.84%
Tier I Capital to Average Assets, For Capital Adequacy Purposes, Amount	$ 62,428	$ 52,620
Tier I Capital to Average Assets, For Capital Adequacy Purposes, Ratio	4.00%	4.00%
Tier I Capital to Average Assets, To be Well Capitalized Under Prompt Corrective Action Provisions, Amount	$ 78,035	$ 65,775
Tier I Capital to Average Assets, To be Well Capitalized Under Prompt Corrective Action Provisions, Ratio	5.00%	5.00%
Bankwell Financial Group Inc.
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Common Equity Tier 1 Capital to Risk-Weighted Assets, Actual Capital, Amount	$ 141,338	$ 128,692
Common Equity Tier 1 Capital to Risk-Weighted Assets, Actual Capital, Ratio	10.82%	10.92%
Common Equity Tier 1 Capital to Risk-Weighted Assets,For Capital Adequacy Purposes, Amount	$ 58,789	$ 53,052
Common Equity Tier 1 Capital to Risk-Weighted Assets,For Capital Adequacy Purposes, Ratio	4.50%	4.50%
Total Capital to Risk-Weighted Assets, Actual Capital, Amount	$ 184,371	$ 167,867
Total Capital to Risk-Weighted Assets, Actual Capital, Ratio	14.11%	14.24%
Total Capital to Risk-Weighted Assets, For Capital Adequacy Purposes, Amount	$ 104,513	$ 94,315
Total Capital to Risk-Weighted Assets, For Capital Adequacy Purposes, Ratio	8.00%	8.00%
Tier I Capital to Risk-Weighted Assets, Actual Capital, Amount	$ 141,338	$ 128,692
Tier I Capital to Risk-Weighted Assets, Actual Capital, Ratio	10.82%	10.92%
Tier I Capital to Risk-Weighted Assets, For Capital Adequacy Purposes, Amount	$ 78,385	$ 70,736
Tier I Capital to Risk-Weighted Assets, For Capital Adequacy Purposes, Ratio	6.00%	6.00%
Tier I Capital to Average Assets, Actual Capital, Amount	$ 141,338	$ 128,692
Tier I Capital to Average Assets, Actual Capital, Ratio	9.06%	9.75%
Tier I Capital to Average Assets, For Capital Adequacy Purposes, Amount	$ 62,415	$ 52,819
Tier I Capital to Average Assets, For Capital Adequacy Purposes, Ratio	4.00%	4.00%

Regulatory Matters (Detail text

Regulatory Matters (Detail textuals)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Percentage of capital ratio	2.00%
Percentage of higher risk weight	150.00%
Risk weight of marketable equity securities	300.00%
Minimum
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Common equity Tier 1 capital requirement of risk-weighted assets	4.50%
Minimum leverage ratio of total assets	4.00%
Minimum Tier 1 capital to risk-weighted assets requirement	6.00%	4.00%
Minimum total capital to risk weighted assets requirement	8.00%
Common equity Tier I capital conservation buffer	2.50%

Related Party Transactions - Ch

Related Party Transactions - Changes in loans outstanding (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Loans and Leases Receivable, Related Parties [Roll Forward]
Balance, beginning of year	$ 12,891	$ 7,509
Additional loans	9,722	5,476
Repayments and changes in status	(142)	(94)
Balance, end of year	$ 22,471	$ 12,891

Related Party Transactions (Det

Related Party Transactions (Detail Textuals) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Related Party Transaction [Line Items]
Related party deposits	$ 40,400	$ 23,100
Payment to related parties for services	$ 28	$ 66
Minimum
Related Party Transaction [Line Items]
Equity ownership percentage	10.00%

Parent Corporation Only Fina105

Parent Corporation Only Financial Statements - Condensed Statements of Financial Condition (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
ASSETS
Cash and due from banks	$ 96,355	$ 88,597	$ 48,559	$ 82,013
Premises and equipment, net	17,835	11,163
Deferred income taxes, net	9,085	8,337
Other assets	7,174	2,851
Total assets	1,628,919	1,330,372
LIABILITIES AND SHAREHOLDERS' EQUITY
Accrued expenses and other liabilities	8,936	6,661
Stockholders' equity	145,895	131,769	129,210	69,485
Total liabilities and stockholders' equity	1,628,919	1,330,372
Parent Company
ASSETS
Cash and due from banks	5,677	5,692	$ 6,640	$ 7,962
Investment in subsidiary	162,162	145,729
Premises and equipment, net	55	120
Deferred income taxes, net	3,063	5,448
Other assets	3,889	2,060
Total assets	174,846	159,049
LIABILITIES AND SHAREHOLDERS' EQUITY
Subordinated debentures	25,051	25,000
Accrued expenses and other liabilities	3,900	2,280
Stockholders' equity	145,895	131,769
Total liabilities and stockholders' equity	$ 174,846	$ 159,049

Parent Corporation Only Fina106

Parent Corporation Only Financial Statements - Condensed Statements of Income (Details 1) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Condensed Financial Statements, Captions [Line Items]
Interest income									$ 58,077	$ 48,692	$ 33,403
Loss before equity in undistributed earnings of subsidiaries	$ 5,173	$ 4,577	$ 4,216	$ 4,344	$ 4,041	$ 3,481	$ 3,561	$ 2,788	18,310	13,871	6,737
Net Income	$ 3,323	$ 3,140	$ 2,896	$ 2,991	$ 2,618	$ 2,253	$ 2,286	$ 1,873	12,350	9,030	4,568
Parent Company
Condensed Financial Statements, Captions [Line Items]
Interest income									23	38	45
Other income
Total income									23	38	45
Expenses									3,444	2,714	1,728
Loss before equity in undistributed earnings of subsidiaries									(3,421)	(2,676)	(1,683)
Equity in undistributed earnings of subsidiaries									15,771	11,706	6,251
Net Income									$ 12,350	$ 9,030	$ 4,568

Parent Corporation Only Fina107

Parent Corporation Only Financial Statements - Condensed Statements of Cash Flows (Details 2) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Cash flows from operating activities
Net income	$ 3,323	$ 3,140	$ 2,896	$ 2,991	$ 2,618	$ 2,253	$ 2,286	$ 1,873	$ 12,350	$ 9,030	$ 4,568
Adjustments to reconcile net income to net cash used by operating activities:
Increase in other assets									(3,006)	(519)	58
Net cash used by operating activities									17,770	14,230	9,170
Cash flows from investing activities
Net cash provided by (used by) investing activities									292,091	194,628	238,699
Cash flows from financing activities
Proceeds from issuance of subordinated debt										25,000
Redemption of SBLF Preferred Stock										10,980
Proceeds from exercise of options									1,106	501	207
Dividends paid on common stock									1,661	376
Dividends paid on preferred stock										(125)	(110)
Proceeds from issuance of common stock									200	3,780	44,704
Net tax benefit related to stock-based compensation									280
Net cash (used by) provided by financing activities									282,079	220,436	196,075
Net decrease in cash and cash equivalents									7,758	40,038	(33,454)
Cash and cash equivalents:
Beginning of year				88,597				48,559	88,597	48,559	82,013
End of period	96,355				88,597				96,355	88,597	48,559
Cash paid for:
Interest									11,793	7,544	3,985
Income taxes									8,584	6,136	2,222
Parent Company
Cash flows from operating activities
Net income									12,350	9,030	4,568
Adjustments to reconcile net income to net cash used by operating activities:
Equity in undistributed earnings									(15,771)	(11,706)	(6,251)
Increase in other assets									(1,828)	(418)	(1,245)
Decrease (Increase) in deferred income taxes, net									2,385	(2,192)	(846)
Increase in other liabilities									1,620	421	641
Stock-based compensation									1,188	1,033	573
Net cash used by operating activities									(56)	(3,832)	(2,560)
Cash flows from investing activities
Cash paid for acquisitions											(3,648)
Capital contribution to Bankwell Bank										(15,000)	(40,000)
Decrease in premises and equipment, net									65	84	85
Net cash provided by (used by) investing activities									65	(14,916)	(43,563)
Cash flows from financing activities
Proceeds from issuance of subordinated debt										25,000
Amortization of debt issuance costs									51
Redemption of SBLF Preferred Stock										(10,980)
Proceeds from exercise of options									1,106	501	207
Dividends paid on common stock									(1,661)	(376)
Dividends paid on preferred stock										(125)	(110)
Proceeds from issuance of common stock									200	3,780	44,704
Net tax benefit related to stock-based compensation									280
Net cash (used by) provided by financing activities									(24)	17,800	44,801
Net decrease in cash and cash equivalents									(15)	(948)	(1,322)
Cash and cash equivalents:
Beginning of year				$ 5,692				$ 6,640	5,692	6,640	7,962
End of period	$ 5,677				$ 5,692				5,677	5,692	6,640
Cash paid for:
Interest
Income taxes

Quarterly Financial Informat108

Quarterly Financial Information of Bankwell Financial Group, Inc. (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Quarterly Financial Information Disclosure [Abstract]
Total interest income	$ 16,642	$ 15,633	$ 14,711	$ 14,004	$ 13,907	$ 13,186	$ 12,388	$ 11,273	$ 60,990	$ 50,754	$ 35,589
Total interest expense	3,354	3,106	2,832	2,606	2,671	2,269	1,647	1,379	11,898	7,966	3,929
Net interest income	13,288	12,527	11,879	11,398	11,236	10,917	10,741	9,894	49,092	42,788	31,660
Provision for loan losses	748	1,219	1,301	646	354	1,489	654	733	3,914	3,230	2,152
Non-interest income	401	750	853	672	820	1,211	854	599	2,676	3,484	3,041
Non-interest expense	7,768	7,481	7,215	7,080	7,661	7,158	7,380	6,972	29,544	29,171	25,812
Income before income taxes	5,173	4,577	4,216	4,344	4,041	3,481	3,561	2,788	18,310	13,871	6,737
Provision from income taxes	1,850	1,437	1,320	1,353	1,423	1,228	1,275	915	5,960	4,841	2,169
Net income	3,323	3,140	2,896	2,991	2,618	2,253	2,286	1,873	12,350	9,030	4,568
Net income attributable to common stockholders	$ 3,323	$ 3,140	$ 2,896	$ 2,991	$ 2,574	$ 2,226	$ 2,259	$ 1,846	$ 12,350	$ 8,905	$ 4,458
Earnings per share:
Basic (in dollars per share)	$ 0.44	$ 0.42	$ 0.38	$ 0.40	$ 0.35	$ 0.31	$ 0.31	$ 0.26	$ 1.64	$ 1.23	$ 0.78
Diluted (in dollars per share)	$ 0.43	$ 0.41	$ 0.38	$ 0.40	$ 0.35	$ 0.31	$ 0.31	$ 0.26	$ 1.62	$ 1.21	$ 0.78