Bankwell Financial (BWFG) 10-K 30 Mar 18 2017 FY Annual report Financial data

Document and Entity Information

Document and Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2017	Feb. 28, 2018	Jun. 30, 2017
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		7,813,404
Entity Public Float			$ 187,472,316
Document Type	10-K
Document Period End Date	Dec. 31, 2017
Amendment Flag	false
Document Fiscal Year Focus	2,017
Document Fiscal Period Focus	FY

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
ASSETS
Cash and due from banks	$ 70,545	$ 96,026
Federal funds sold	186	329
Cash and cash equivalents	70,731	96,355
Available for sale investment securities, at fair value	92,188	87,751
Held to maturity investment securities, at amortized cost	21,579	16,859
Loans held for sale		254
Loans receivable (net of allowance for loan losses of $18,904 and $17,982 at December 31, 2017 and 2016, respectively)	1,520,879	1,343,895
Foreclosed real estate		272
Accrued interest receivable	5,910	4,958
Federal Home Loan Bank stock, at cost	9,183	7,943
Premises and equipment, net	18,196	17,835
Bank-owned life insurance	39,618	33,448
Goodwill	2,589	2,589
Other intangible assets	382	501
Deferred income taxes, net	4,904	9,085
Other assets	10,448	7,174
Total assets	1,796,607	1,628,919
Deposits
Noninterest bearing deposits	172,638	187,593
Interest bearing deposits	1,225,767	1,101,444
Total deposits	1,398,405	1,289,037
Advances from the Federal Home Loan Bank	199,000	160,000
Subordinated debentures	25,103	25,051
Accrued expenses and other liabilities	13,072	8,936
Total liabilities	1,635,580	1,483,024
Commitments and contingencies (Note 12)
Shareholders' equity
Common stock, no par value; 10,000,000 shares authorized, 7,751,424 and 7,620,663 shares issued and outstanding at December 31, 2017 and 2016, respectively	118,301	115,353
Retained earnings	41,032	29,652
Accumulated other comprehensive income	1,694	890
Total shareholders' equity	161,027	145,895
Total liabilities and shareholders' equity	$ 1,796,607	$ 1,628,919

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parentheticals) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Statement of Financial Position [Abstract]
Allowance for loan losses (in dollars)	$ 18,904	$ 17,982
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	7,751,424	7,620,663
Common Stock, Shares, Outstanding	7,751,424	7,620,663

Consolidated Statements of Inco

Consolidated Statements of Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Interest and dividend income
Interest and fees on loans	$ 66,841	$ 58,077	$ 48,692
Interest and dividends on securities	3,570	2,740	1,964
Interest on cash and cash equivalents	790	173	98
Total interest and dividend income	71,201	60,990	50,754
Interest expense
Interest expense on deposits	12,694	8,300	5,681
Interest on borrowings	4,143	3,598	2,285
Total interest expense	16,837	11,898	7,966
Net interest income	54,364	49,092	42,788
Provision for loan losses	1,341	3,914	3,230
Net interest income after provision for loan losses	53,023	45,178	39,558
Noninterest income
Gains and fees from sales of loans	1,427	466	1,113
Bank owned life insurance	1,170	693	727
Service charges and fees	1,007	963	933
Gain (Loss) on sale of available for sale securities, net	165	(115)
(Loss) Gain on sale of foreclosed real estate	(78)	128
Other	938	541	711
Total noninterest income	4,629	2,676	3,484
Noninterest expense
Salaries and employee benefits	16,284	15,655	15,736
Occupancy and equipment	6,165	5,811	5,341
Professional services	2,072	1,654	1,447
Data processing	1,866	1,603	1,523
Marketing	1,193	948	985
FDIC insurance	1,116	660	672
Director fees	912	859	951
Amortization of intangibles	118	151	196
Foreclosed real estate	70	157	168
Merger and acquisition related expenses			2
Other	2,727	2,046	2,150
Total noninterest expense	32,523	29,544	29,171
Income before income tax expense	25,129	18,310	13,871
Income tax expense	11,299	5,960	4,841
Net income	13,830	12,350	9,030
Net income attributable to common shareholders	$ 13,830	$ 12,350	$ 8,905
Earnings Per Common Share:
Basic (in dollars per share)	$ 1.80	$ 1.64	$ 1.23
Diluted (in dollars per share)	$ 1.78	$ 1.62	$ 1.21
Weighted Average Common Shares Outstanding:
Basic (in shares)	7,572,409	7,396,019	7,071,550
Diluted (in shares)	7,670,413	7,491,052	7,140,558
Dividends per common share (in dollars per share)	$ 0.28	$ 0.22	$ 0.05

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Statement of Comprehensive Income [Abstract]
Net income	$ 13,830	$ 12,350	$ 9,030
Unrealized (losses) gains on securities:
Unrealized holding losses on available for sale securities	(357)	(109)	(431)
Reclassification adjustment for (gain) loss realized in net income	(165)	115
Net change in unrealized (loss) gain	(522)	6	(431)
Income tax effect - benefit (expense)	182	(2)	192
Unrealized (losses) gains on securities, net of tax	(340)	4	(239)
Unrealized gains (losses) on interest rate swaps:
Unrealized gain (losses) on interest rate swaps designated as cash flow hedges	1,297	1,013	(89)
Tax effect - (expense) benefit	(454)	(354)	24
Unrealized gains (losses) on interest rate swaps, net of tax	843	659	(65)
Total other comprehensive income (loss), net of tax	503	663	(304)
Comprehensive income	$ 14,333	$ 13,013	$ 8,726

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, 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, net of tax				(304)	(304)
Cash dividends declared ($0.05, $0.22 and $0.28 per share for 2015, 2016 and 2017 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, net of tax				663	663
Cash dividends declared ($0.05, $0.22 and $0.28 per share for 2015, 2016 and 2017 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
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income			13,830		13,830
Other comprehensive income, net of tax				503	503
Cash dividends declared ($0.05, $0.22 and $0.28 per share for 2015, 2016 and 2017 respectively)			(2,149)		(2,149)
Stock-based compensation expense		917			917
Warrants exercised		663			663
Warrants exercised (in shares)	35,000
Issuance of restricted stock (in shares)	40,250
Forfeitures of restricted stock (in shares)	(18,228)
Stock options exercised		1,368			1,368
Stock options exercised (in shares)	73,738
Reclass adjustment resulting from tax law change			(301)	301
Balance at Dec. 31, 2017		$ 118,301	$ 41,032	$ 1,694	$ 161,027
Balance (in shares) at Dec. 31, 2017	7,751,423

Consolidated Statements of Sha7

Consolidated Statements of Shareholders' Equity (Parentheticals) - $ / shares	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Statement of Stockholders' Equity [Abstract]
Cash dividends declared (in shares)	$ 0.28	$ 0.22	$ 0.05

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Cash flows from operating activities
Net income	$ 13,830	$ 12,350	$ 9,030
Adjustments to reconcile net income to net cash provided by operating activities:
Net (accretion) amortization of premiums and discounts on investment securities	(31)	1,737	99
Provision for loan losses	1,341	3,914	3,230
Deferred income taxes	3,908	(1,104)	(966)
Net (gain) loss on sales of available for sale securities	(165)	115
Depreciation and amortization	1,513	1,729	1,685
Amortization of debt issuance costs	52	51
Increase in cash surrender value of bank-owned life insurance	(1,170)	(693)	(727)
Loan principal sold from loans originated for sale	(3,485)	(3,313)	(6,929)
Proceeds from sales of loans originated for sale	4,626	3,381	7,546
Originations of loans held for sale		(254)
Net gain on sales of loans	(1,427)	(466)	(1,113)
Stock-based compensation	917	1,188	1,033
Net accretion of purchase accounting adjustments	(80)	(136)	(104)
Loss on sale and write-downs of foreclosed real estate	128	25	184
Net change in:
Deferred loan fees	(829)	466	668
Accrued interest receivable	(952)	(887)	(748)
Other assets	(1,740)	(3,006)	(519)
Accrued expenses and other liabilities	4,136	2,275	779
Net cash provided by operating activities	20,572	17,372	13,148
Cash flows from investing activities
Proceeds from principal repayments on available for sale securities	5,217	770	1,877
Proceeds from principal repayments on held to maturity securities	212	205	220
Net proceeds from sales and calls of available for sale securities	54,705	60,696	22,030
Net proceeds from sales and calls of held to maturity securities	5,690		1,000
Purchases of available for sale securities	(64,700)	(110,485)
Purchase of held to maturity securities	(10,609)	(6,835)
Purchase of bank-owned life insurance	(5,000)	(9,000)
Net increase in loans	(177,549)	(218,603)	(218,772)
Loan principal sold from loans not originated for sale	(14,264)	(4,069)	(23,380)
Proceeds from sales of loans not originated for sale	14,805	4,467	24,462
Purchases of premises and equipment	(1,874)	(8,401)	(938)
Purchase of Federal Home Loan Bank stock	(1,239)	(1,389)	(445)
Proceeds from sale of foreclosed real estate	144	951	400
Net cash used by investing activities	(194,462)	(291,693)	(193,546)
Cash flows from financing activities
Net change in time certificates of deposit	29,417	165,224	128,379
Net change in other deposits	79,967	76,930	83,257
Net change in FHLB advances	39,000	40,000	(9,000)
Proceeds from exercise of warrants	663	200	3,780
Proceeds from exercise of options	1,368	1,106	501
Issuance of subordinated debt			25,000
Redemption of SBLF preferred stock			(10,980)
Dividends paid on common stock	(2,149)	(1,661)	(376)
Dividends paid on preferred stock			(125)
Net tax benefit related to stock-based compensation		280
Net cash provided by financing activities	148,266	282,079	220,436
Net (decrease) increase in cash and cash equivalents	(25,624)	7,758	40,038
Cash and cash equivalents:
Beginning of year	96,355	88,597	48,559
End of period	70,731	96,355	88,597
Cash paid for:
Interest	16,582	11,793	7,544
Income taxes	8,020	8,584	6,136
Noncash investing and financing activities
Loans transferred to foreclosed real estate			883
Net change in unrealized gains on available-for-sale securities	$ (522)	$ 6	$ (430)

Nature of Operations and Summar

Nature of Operations and Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2017
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”). The Bank was originally chartered as two separate banks, The Bank of New Canaan (“BNC”) and The Bank of Fairfield (“TBF”). In September 2013, BNC and TBF were merged and rebranded as “Bankwell 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 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 and throughout Connecticut, with the majority of our loans in Fairfield and New Haven Counties, 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 and throughout 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, including its wholly owned passive investment company subsidiary. 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 the allowance for loan losses, stock-based compensation, derivative instrument valuation, investment securities valuation, evaluation of investment securities for other than temporary impairment and deferred income taxes 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 Company 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 the fair value of 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. Transfers of debt securities into the held to maturity classification from the available for sale classification are made at fair value on the date of transfer. The unrealized holding gain or loss on the date of transfer is retained in accumulated other comprehensive income and in the carrying value of the held to maturity securities. Such amounts are amortized over the remaining contractual lives of the securities. When transfers of debt securities into the available for sale classification from the held to maturity classification occur, any unrealized holding gains or losses on the transfer date are recognized in other comprehensive income 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 trade 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. Transfers of financial assets are accounted for as sales when control over the assets has been surrendered. Control over transferred assets is deemed to be surrendered when (1) the assets have been isolated from the Company — put presumptively beyond the reach of the transferor and its creditors, even in bankruptcy or other receivership, (2) the transferee obtains the right (free of conditions that constrain it from taking advantage of that right) to pledge or exchange the transferred assets, and (3) the transferor does not maintain effective control over the transferred assets through either (a) an agreement that both entitles and obligates the transferor to repurchase or redeem the assets before maturity or (b) the ability to unilaterally cause the holder to return specific assets, other than through a cleanup call. 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. Impaired loans also include loans modified in troubled debt restructurings where concessions have been granted to borrowers experiencing financial difficulties. These concessions could include a reduction in the interest rate on the loan, payment extensions, forgiveness of principal, forbearance or other actions intended to maximize collection. 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, including appropriate peer data, adjusted for qualitative factors. 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. Reserve for Unfunded Commitments The reserve for unfunded commitments provides for probable losses inherent with funding the unused portion of legal commitments to lend. The unfunded reserve calculation includes factors that are consistent with the ALLL methodology for our loan portfolio as well as a draw down factor applied to the various commitments. The reserve for unfunded credit commitments is included within other liabilities in the accompanying Consolidated Balance Sheets, and changes in the reserve are reported as a component of other expense in the accompanying Consolidated Statements of Income. See Note 12: Commitments and Contingencies for further information. 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. Impairment of Long-Lived Assets Long-lived assets, including premises and equipment, are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable. If impairment is indicated by that review, the asset is written down to its estimated fair value through a charge to noninterest expense. Servicing Rights When loans are sold, on a servicing retained basis, servicing rights are initially recorded at fair value with the income statement effect recorded in service charges and fees income. All classes of servicing assets are subsequently measured using the amortization method which requires servicing rights to be amortized into noninterest income in proportion to, and over the period of, the life of the underlying loans. Servicing rights are evaluated for impairment based upon the fair value of the rights as compared to carrying amount. Any impairment is reported as a valuation allowance, to the extent that fair value is less than the carrying amount. If the Company later determines that all or a portion of the impairment no longer exists, a reduction of the allowance may be recorded as an increase to income. Changes in the valuation allowance are reported with service charges and fees income on the consolidated statements of income. The fair values of servicing rights are subject to fluctuations as a result of changes in estimated and actual prepayment speeds and default rates and losses. Loans serviced for others are not included in the accompanying consolidated balance sheets. Servicing fee income, which is included in service charges and fees on the income statement, is recorded for fees earned for servicing loans. Fees earned for servicing loans are based on a contractual percentage of the outstanding principal amount of the loan and are recorded as income when earned. The amortization of servicing rights is netted against income from service charges and fees. Income Taxes The Company recognizes income taxes under the asset and liability method. Under this method, deferred tax assets and liabilities are recognized for the future tax consequences attributable to differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax bases. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which those temporary differences are expected to be recovered or settled. The effect on deferred tax assets and liabilities of a change in tax rates is recognized in income in the period that includes the enactment date. Deferred tax assets are reduced by a valuation allowance when, in the opinion of management, it is more-likely-than-not that all or some portion of the deferred tax assets will not be realized. 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. The portion of the benefits associated with tax positions taken that exceeds the amount measured as described above is reflected as a liability for unrecognized tax benefits along with any associated interest and penalties that would be payable to the taxing authorities upon examination. The Company has $393 thousand and $95 thousand of liabilities for uncertain tax positions at December 31, 2017 and 2016. 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-Scholes 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. The Company recognizes forfeitures as they occur. Earnings Per Share Unvested restricted stock awards that contain non-forfeitable rights to dividends, are participating securities, and are included in the computation of EPS pursuant to the two-class method. The two-class method is an earnings allocation formula that determines EPS for each class of common stock and participating security according to dividends declared (or accumulated) and participation rights in undistributed earnings. The Company’s unvested restricted stock awards qualify as participating securities. Net income is allocated between the common stock and participating securities pursuant to the two-class method. Basic EPS is computed by dividing net income available to common shareholders by the weighted average number of common shares outstanding during the period, excluding participating unvested restricted stock awards. Diluted EPS is computed in a similar manner, except that the denominator includes the number of additional common shares that would have been outstanding if potentially dilutive common shares were issued using the treasury stock method. 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 unrealized 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, 2017, 2016 and 2015 is reported in the Consolidated Statements of Comprehensive Income. Fair Values of Financial Instruments The Company uses fair value measurements to record fair value adjustments to certain assets and to determine fair value disclosures. Fair value is the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. Fair value is best determined based upon quoted market prices. However, in certain instances, there are no quoted market prices for certain assets or liabilities. 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 rate and estimates of future cash flows. Accordingly, the fair value estimates may not be realized in an immediate settlement of the asset or liability. Fair value measurements focus on exit prices in an orderly transaction (that is, not a forced liquidation or distressed sale) between market participants at the measurement date under current market conditions. If there has been a significant decrease in the volume and level of activity for the asset or liability, a change in valuation technique or the use of multiple valuation techniques may be appropriate. In such instances, determining the price at which willing market participants would transact at the measurement date under current market conditions depends on the facts and circumstances and requires the use of significant judgment. 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 at either December 31, 2017 or December 31, 2016. 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. Derivative Instruments 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 interest rate swap assets are presented in other assets and the interest rate swap liabilities are presented in accrued expense

Shareholders' Equity

Shareholders' Equity	12 Months Ended
	Dec. 31, 2017
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 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 46,200 warrants have been exercised as of December 31, 2017. 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 2017 or 2016.

Reserve Requirements On Cash an

Reserve Requirements On Cash and Due From Banks	12 Months Ended
	Dec. 31, 2017
Reserve Requirements On Cash And Due From Banks [Abstract]
Reserve Requirements On Cash and Due From Banks	3. Reserve Requirements On Cash and Due From Banks The Bank is required to maintain a minimum reserve balance of  $11.1 million and $11.8 million in the Federal Reserve Bank at December 31, 2017 and 2016, respectively. The Bank is also required to maintain a minimum reserve balance of  $7.5 million and $10.1 million at Atlantic Community Bankers Bank (formerly Bankers’ Bank Northeast) at December 31, 2017 and 2016, respectively. These balances are maintained for clearing purposes in the ordinary course of business and do not represent restricted cash.

Goodwill and other intangible a

Goodwill and other intangible assets	12 Months Ended
	Dec. 31, 2017
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, 2017 and 2016 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. The remaining net intangible asset as of December 31, 2017 will be amortized over a period of approximately 5 years. Gross Intangible Accumulated Net Intangible (In thousands) December 31, 2017 Core deposit intangible $ 1,029 $ 647 $ 382 December 31, 2016 Core deposit intangible $ 1,029 $ 528 $ 501

Investment Securities

Investment Securities	12 Months Ended
	Dec. 31, 2017
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, 2017 were as follows: December 31, 2017 Amortized Gross Unrealized Fair Value Gains Losses (In thousands) Available for sale securities: U.S. Government and agency obligations Due from one through five years $ 13,000 $ — $ (82 ) $ 12,918 Due from five through ten years 100 — (4 ) 96 Due after ten years 59,924 10 (174 ) 59,760 73,024 10 (260 ) 72,774 State agency and municipal obligations Due from one through five years 2,873 84 — 2,957 Due from five through ten years 7,386 228 — 7,614 Due after ten years 1,700 33 (27 ) 1,706 11,959 345 (27 ) 12,277 Corporate bonds Due from one through five years 7,096 41 — 7,137 7,096 41 — 7,137 Total available for sale securities $ 92,079 $ 396 $ (287 ) $ 92,188 Held to maturity securities: State agency and municipal obligations Less Than 1 Year $ 198 5 — $ 203 Due from one through five years 3,880 20 — 3,900 Due after ten years 16,387 1,227 — 17,614 20,465 1,252 — 21,717 Corporate bonds Due from one through five years 1,000 — (5 ) 995 Government-sponsored mortgage backed securities No contractual maturity 114 10 — 124 Total held to maturity securities $ 21,579 $ 1,262 $ (5 ) $ 22,836 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 Value 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 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 gross realized gains on the sale of investment securities totaled $165 thousand for the year ended December 31, 2017. Total sales proceeds were $49.2 million for the year ended December 31, 2017. There were no gross realized losses on the sale of investment securities for the year ended December 31, 2017. The gross realized gains on the sale of investment securities totaled $129.4 thousand for the year ended December 31, 2016. The gross realized losses on the sale of investment securities totaled $244.6 thousand for the year ended December 31, 2016. Total sales proceeds were $54.7 million for the year ended December 31, 2016. At December 31, 2017 there were no securities pledged as collateral with the FHLB. At December 31, 2016, securities with approximate fair values of  $60.0 million were pledged as collateral with the FHLB. 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, 2017 and 2016: Length of Time in Continuous Unrealized Loss Position Less Than 12 Months 12 Months or More Total Fair Unrealized Percent Fair Unrealized Percent Fair Unrealized Percent (In thousands) December 31, 2017 U.S. Government and agency obligations $ 70,419 (225 ) 0.32 % $ 2,064 (35 ) 1.67 % $ 72,483 $ (260 ) 0.36 % State agency and municipal 92 — 0.16 656 (27 ) 3.95 748 (27 ) 3.50 Corporate bonds — — — 995 (5 ) 0.50 995 (5 ) 0.50 Total investment securities $ 70,511 $ (225 ) 0.32 % $ 3,715 $ (67 ) 1.77 % $ 74,226 $ (292 ) 0.39 % December 31, 2016 U.S. Government and agency obligations $ 3,045 $ (54 ) 1.74 % $ — $ — — $ 3,045 $ (54 ) 1.74 % State agency and municipal 2,756 (123 ) 4.29 — — — 2,756 (123 ) 4.29 Corporate bonds 978 (23 ) 2.25 — — — 978 (23 ) 2.25 Total investment securities $ 6,779 $ (200 ) 2.86 % $ — $ — — $ 6,779 $ (200 ) 2.86 % There were fifteen and eleven individual investment securities as of December 31, 2017 and December 31, 2016, respectively, in which the fair value of the security was less than the amortized cost of the security. The U.S. Government and agency obligations owned are either direct obligations of the U.S. Government or guaranteed by the U.S. Government, therefore the contractual cash flows are guaranteed and as a result the securities in this portfolio are not considered other than temporarily impaired. The Company continually monitors its state agency, municipal and corporate bond portfolios and at this time these portfolios have minimal default risk because state agency, municipal and corporate bonds are all rated above investment grade and as a result the securities in these portfolios are not considered other than temporarily impaired. The Company has the intent and ability to retain its investment securities in an unrealized loss position at December 31, 2017 until the decline in value has recovered.

Loans Receivable and Allowance

Loans Receivable and Allowance for Loan Losses	12 Months Ended
	Dec. 31, 2017
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, which was at fair value at the date of acquisition. 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, 2017 and 2016: December 31, 2017 December 31, 2016 Originated Acquired Total Originated Acquired Total (In thousands) Real estate loans: Residential $ 186,107 $ 7,417 $ 193,524 $ 187,098 $ 8,631 $ 195,729 Commercial 945,277 41,965 987,242 802,156 43,166 845,322 Construction 101,636 — 101,636 107,329 112 107,441 1,233,020 49,382 1,282,402 1,096,583 51,909 1,148,492 Commercial business 249,719 10,276 259,995 198,456 17,458 215,914 Consumer 192 427 619 672 861 1,533 Total loans 1,482,931 60,085 1,543,016 1,295,711 70,228 1,365,939 Allowance for loan losses (18,848 ) (56 ) (18,904 ) (17,883 ) (99 ) (17,982 ) Deferred loan origination fees, net (3,242 ) — (3,242 ) (4,071 ) — (4,071 ) Unamortized loan premiums 8 — 8 9 — 9 Loans receivable, net $ 1,460,849 $ 60,029 $ 1,520,878 $ 1,273,766 $ 70,129 $ 1,343,895 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, 2017 and 2016: 2017 2016 (In thousands) Balance at beginning of period $ 666 $ 871 Accretion (113 ) (154 ) Other (a) — (51 ) Balance at end of period $ 553 $ 666 (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 for commercial loans, to be based on the borrower’s ability to generate continuing cash flows. In the fourth quarter of 2017 management made the strategic decision to no longer originate residential mortgage loans. The Company’s policy for residential lending allowed 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 have exceeded 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, or a religious or civic organization. Private mortgage insurance may have been 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. 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: Commercial Business: Consumer: Allowance for loan losses As of December 31, 2017 the Company has changed its methodology to estimate its allowance for loan losses. The change in methodology resulted in an update to the underlying loan loss assumptions, incorporating the most recent industry, peer and product loss trends. This resulted in a non-recurring, pretax $1.3 million reduction in the reserve. The following tables set forth the activity in the Company’s allowance for loan losses for the years ended December 31, 2017, 2016 and 2015, by portfolio segment: Residential Commercial Construction Commercial Consumer Total (In thousands) December 31, 2017 Originated Beginning balance $ 1,802 $ 9,386 $ 2,105 $ 4,240 $ 350 $ 17,883 Charge-offs — — — (478 ) (32 ) (510 ) Recoveries 146 — — 4 3 153 Provisions (227 ) 3,355 (1,198 ) (288 ) (320 ) 1,322 Ending balance $ 1,721 $ 12,741 $ 907 $ 3,478 $ 1 $ 18,848 Acquired Beginning balance $ — $ 29 $ — $ 43 $ 27 $ 99 Charge-offs — — — (43 ) (19 ) (62 ) Recoveries — — — — — — Provisions — 7 — 20 (8 ) 19 Ending balance $ — $ 36 $ — $ 20 $ — $ 56 Total Beginning balance $ 1,802 $ 9,415 $ 2,105 $ 4,283 $ 377 $ 17,982 Charge-offs — — — (521 ) (51 ) (572 ) Recoveries 146 — — 4 3 153 Provisions (227 ) 3,362 (1,198 ) (268 ) (328 ) 1,341 Ending balance $ 1,721 $ 12,777 $ 907 $ 3,498 $ 1 $ 18,904 Residential Commercial Construction Commercial Consumer Total (In thousands) December 31, 2016 Originated Beginning balance $ 1,618 $ 7,693 $ 1,504 $ 3,310 $ 3 $ 14,128 Charge-offs — — — (59 ) (10 ) (69 ) Recoveries — — — — 8 8 Provisions 184 1,693 601 989 349 3,816 Ending balance $ 1,802 $ 9,386 $ 2,105 $ 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 $ 1,618 $ 7,705 $ 1,504 $ 3,334 $ 8 $ 14,169 Charge-offs — — (7 ) (69 ) (35 ) (111 ) Recoveries — — — — 10 10 Provisions 184 1,710 608 1,018 394 3,914 Ending balance $ 1,802 $ 9,415 $ 2,105 $ 4,283 $ 377 $ 17,982 Residential Commercial Construction Commercial Consumer Total (In thousands) December 31, 2015 Originated Beginning balance $ 1,636 $ 5,480 $ 1,102 $ 2,638 $ 4 $ 10,860 Charge-offs — — — — (6 ) (6 ) Recoveries — — — — 7 7 Provisions (18 ) 2,213 402 672 (2 ) 3,267 Ending balance $ 1,618 $ 7,693 $ 1,504 $ 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 $ 1,636 $ 5,480 $ 1,102 $ 2,638 $ 4 $ 10,860 Charge-offs — — — (15 ) (15 ) (30 ) Recoveries — — — 100 9 109 Provisions (18 ) 2,225 402 611 10 3,230 Ending balance $ 1,618 $ 7,705 $ 1,504 $ 3,334 $ 8 $ 14,169 Loans evaluated for impairment and the related allowance for loan losses as of December 31, 2017 and 2016 were as follows: Originated Loans Acquired Loans Total Portfolio Allowance Portfolio Allowance Portfolio Allowance (In thousands) December 31, 2017 Loans individually evaluated for impairment: Residential real estate $ 4,168 $ 8 $ 439 $ — $ 4,607 $ 8 Commercial real estate 6,416 842 1,170 34 7,586 876 Commercial business 2,126 51 534 20 2,660 71 Subtotal 12,710 901 2,143 54 14,853 955 Loans collectively evaluated for impairment: Residential real estate 181,939 1,713 6,978 — 188,917 1,713 Commercial real estate 938,861 11,899 40,795 2 979,656 11,901 Construction 101,636 907 — — 101,636 907 Commercial business 247,593 3,427 9,742 — 257,335 3,427 Consumer 192 1 427 — 619 1 Subtotal 1,470,221 17,947 57,942 2 1,528,163 17,949 Total $ 1,482,931 $ 18,848 $ 60,085 $ 56 $ 1,543,016 $ 18,904 Originated Loans Acquired Loans Total Portfolio Allowance Portfolio Allowance Portfolio Allowance (In thousands) December 31, 2016 Loans individually evaluated for impairment: Residential real estate $ 1,228 $ — $ 453 $ — $ 1,681 $ — Commercial real estate 774 1 144 7 918 8 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 185,870 1,802 8,178 — 194,048 1,802 Commercial real estate 801,382 9,385 43,022 22 844,404 9,407 Construction 107,329 2,105 112 — 107,441 2,105 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 Credit quality indicators To measure credit risk for the loan portfolios, the Company employs a credit risk rating system. This risk rating represents an assessed level of the loan’s risk based on the character and creditworthiness of the borrower/guarantor, the capacity of the borrower to adequately service the debt, any credit enhancements or additional sources of repayment, and the quality, value and coverage of the collateral, if any. The objectives of the Company’s risk rating system are to provide the Board of Directors and senior management with an objective assessment of the overall quality of the loan portfolio, to promptly and accurately identify loans with well-defined credit weaknesses so that timely action can be taken to minimize credit loss, to identify relevant trends affecting the collectability of the loan portfolio and to isolate potential problem areas and to provide essential information for determining the adequacy of the allowance for loan losses. The Company’s credit risk rating system has nine grades, with each grade corresponding to a progressively greater risk of default. Risk ratings of 1 through 5 are Pass categories and risk ratings of 6 through 9 are criticized asset categories as defined by the regulatory agencies. A “Special Mention” (6) credit has a potential weakness which, if uncorrected, may result in a deterioration of the repayment prospects or inadequately protect the Company’s credit position at some time in the future. “Substandard” loans (7) are credits that have a well-defined weakness or weaknesses that jeopardize the full repayment of the debt. An asset rated “Doubtful” (8) has all the weaknesses inherent in a substandard asset and which, in addition, make collection or liquidation in full highly questionable and improbable, when considering existing facts, conditions, and values. Loans classified as “Loss” (9) are considered uncollectible and of such little value that their continuance as bankable assets is not warranted. This classification does not mean that the loan has absolutely no recovery or salvage value; rather, it is not practical or desirable to defer writing-off this basically worthless asset even though partial recovery may be made in the future. Risk ratings are assigned as necessary to differentiate risk within the portfolio. They are reviewed on an ongoing basis through the annual loan review process performed by Company personnel, normal renewal activity and the quarterly watchlist and watched asset report process. They are revised to reflect changes in the borrowers’ financial condition and outlook, debt service coverage capability, repayment performance, collateral value and coverage as well as other considerations. In addition to internal review at multiple points, outsourced loan review opines on risk ratings with regard to the sample of loans their review covers. The following table presents credit risk ratings by loan segment as of December 31, 2017 and 2016: Commercial Credit Quality Indicators At December 31, 2017 At December 31, 2016 Commercial Construction Commercial Total Commercial Construction Commercial Total (In thousands) Originated loans: Pass $ 920,216 $ 101,636 $ 242,828 $ 1,264,680 $ 797,249 $ 107,329 $ 196,436 $ 1,101,014 Special mention 9,262 — 4,019 13,281 4,605 — 115 4,720 Substandard 15,799 — 2,872 18,671 302 — 1,905 2,207 Doubtful — — — — — — — — Loss — — — — — — — — Total originated loans 945,277 101,636 249,719 1,296,632 802,156 107,329 198,456 1,107,941 Acquired loans: Pass 40,686 — 9,742 50,428 41,582 112 16,836 58,530 Special mention 109 — — 109 1,584 — 86 1,670 Substandard 1,170 — 425 1,595 — — 536 536 Doubtful — — 109 109 — — — — Loss — — — — — — — — Total acquired loans 41,965 — 10,276 52,241 43,166 112 17,458 60,736 Total loans: Pass 960,902 101,636 252,570 1,315,108 838,831 107,441 213,272 1,159,544 Special mention 9,371 — 4,019 13,390 6,189 — 201 6,390 Substandard 16,969 — 3,297 20,266 302 — 2,441 2,743 Doubtful — — 109 109 — — — — Loss — — — — — — — — Total loans $ 987,242 $ 101,636 $ 259,995 $ 1,348,873 $ 845,322 $ 107,441 $ 215,914 $ 1,168,677 Residential and Consumer Credit Quality Indicators At December 31, 2017 At December 31, 2016 Residential Consumer Total Residential Consumer Total (In thousands) Originated loans: Pass $ 181,939 $ 192 $ 182,131 $ 185,252 $ 331 $ 185,583 Special mention — — — 216 — 216 Substandard 4,168 — 4,168 1,630 — 1,630 Doubtful — — — — — — Loss — — — — 341 341 Total originated loans 186,107 192 186,299 187,098 672 187,770 Acquired loans: Pass 6,978 427 7,405 7,646 835 8,481 Special mention — — — 49 — 49 Substandard 439 — 439 936 2 938 Doubtful — — — — — — Loss — — — — 24 24 Total acquired loans 7,417 427 7,844 8,631 861 9,492 Total loans: Pass 188,917 619 189,536 192,898 1,166 194,064 Special mention — — — 265 — 265 Substandard 4,607 — 4,607 2,566 2 2,568 Doubtful — — — — — — Loss — — — — 365 365 Total loans $ 193,524 $ 619 $ 194,143 $ 195,729 $ 1,533 $ 197,262 Loan portfolio aging analysis When a loan is 15 days past due, the Company sends the borrower a late notice. The Company also contacts the borrower by phone if the delinquency is not corrected promptly after the notice has been sent. When the loan is 30 days past due, the Company mails the borrower a letter reminding the borrower of the delinquency, and attempts to contact the borrower personally to determine the reason for the delinquency and ensure the borrower understands the terms of the loan. If necessary, subsequent 90th day of delinquency, the Company may take other appropriate legal action. A summary report of all loans 30 days or more past due is provided to the board of directors of the Company each month. Loans greater than 90 days past due are generally put on nonaccrual status. 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. A loan is considered to be no longer delinquent when timely payments are made for a period of at least six months (one year for loans providing for quarterly or semi-annual payments) by the borrower in accordance with the contractual terms. The following tables set forth certain information with respect to our loan portfolio delinquencies by portfolio segment and amount as of December 31, 2017 and December 31, 2016: As of December 31, 2017 31 – 60 Days 61 – 90 Days Greater Than Total Past Current Total Loans (In thousands) Originated Loans Real estate loans: Residential real estate $ 1,092 $ 2,244 $ 969 $ 4,305 $ 181,802 $ 186,107 Commercial real estate 9,529 4,116 1,444 15,089 930,188 945,277 Construction — — — — 101,636 101,636 Commercial business 4,223 — 142 4,365 245,354 249,719 Consumer — — — — 192 192 Total originated loans 14,844 6,360 2,555 23,759 1,459,172 1,482,931 Acquired Loans Real estate loans: Residential real estate 156 — 192 348 7,069 7,417 Commercial real estate 499 — 630 1,129 40,836 41,965 Commercial business 95 162 339 596 9,680 10,276 Consumer 3 — 2 5 422 427 Total acquired loans 753 162 1,163 2,078 58,007 60,085 Total loans $ 15,597 $ 6,522 $ 3,718 $ 25,837 $ 1,517,179 $ 1,543,016 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 $ — $ 173 $ 969 $ 1,142 $ 185,956 $ 187,098 Commercial real estate 147 1,848 302 2,297 799,859 802,156 Construction — — — — 107,329 107,329 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 — — 453 453 8,178 8,631 Commercial real estate 866 722 143 1,731 41,435 43,166 Construction — — — — 112 112 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 There were no loans delinquent greater than 90 days and still accruing as of December 31, 2017 and there were no loans delinquent greater than 90 days and still accruing as of December 31, 2016. Loans on nonaccrual status The following is a summary of nonaccrual loans by portfolio segment as of December 31, 2017 and 2016: December 31, 2017 2016 (In thousands) Residential real estate $ 1,590 $ 1,612 Commercial real estate 3,371 446 Commercial business 520 538 Consumer — 341 Total $ 5,481 $ 2,937 Lost interest income on originated loans that would have been recognized if loans on nonaccrual status had been current in accordance with their original terms for the years ended December 31, 2017, 2016 and 2015 was $174 thousand, $17 thousand and $25 thousand, respectively. The amount of actual interest income recognized on these loans was $68 thousand, $74 thousand and $43 thousand for the years ended December 31, 2017, 2016 and 2015, respectively. At December 31, 2017 and 2016, there were no 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 in accordance with 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 estimated to be impaired. 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, 2017, 2016 and 2015: As of and for the Year Ended December 31, 2017 Carrying Unpaid Associated Average Interest (In thousands) Originated Impaired loans without a valuation allowance: Residential real estate $ 3,076 $ 3,094 $ — $ 3,080 $ — Commercial real estate 859 875 — 881 11 Construction — — — — — Commercial business 1,548 1,548 — 1,621 70 Total impaired loans without a valuation allowance $ 5,483 $ 5,517 $ — $ 5,582 $ 81 Impaired loans with a valuation allowance: Residential real estate $ 1,092 $ 1,092 $ 8 $ 1,100 $ — Commercial real estate 5,557 5,557 842 5,603 261 Commercial business 578 578 51 588 47 Total impaired loans with a valuation allowance 7,227 7,227 901 7,291 308 Total originated impaired loans $ 12,710 $ 12,744 $ 901 $ 12,873 $ 389 Acquired Impaired loans without a valuation allowance: Residential real estate $ 439 $ 462 $ — $ 450 $ — Commercial real estate 982 1,040 — 1,035 10 Commercial Business 402 476 — 488 19 Consumer — — — — — Total impaired loans without a valuation allowance $ 1,823 $ 1,978 $ — $ 1,973 $ 29 Impaired loans with a valuation allowance: Commercial real estate $ 188 $ 188 $ 34 $ 251 $ — Commercial business 132 134 20 285 — Total impaired loans with a valuation allowance 320 322 54 536 — Total acquired impaired loans $ 2,143 $ 2,300 $ 54 $ 2,509 $ 29 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 $ 1,228 $ 1,238 $ — $ 1,236 $ 10 Commercial real estate 651 651 — 668 29 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: 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: Residential real estate $ 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 $ 1,391 $ 1,393 $ — $ 1,402 $ 37 Commercial real estate 4,291 4,291 — 4,308 124 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: Residential real estate $ 197 $ 200 $ — $ 198 $ 2 Commercial real estate 611 678 — 602 6 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 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 $4.9 million at December 31, 2017 and $1.4 million at December 31, 2016. 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 2017 2016 2015 2017 2016 2015 2017 2016 2015 (Dollars in thousands) Years ended December 31, Commercial real estate — 1 3 $ — $ 62 $ 4,044 $ — $ 62 $ 4,044 Residential real estate 2 — — 2,957 — — 2,957 — — Commercial business 4 2 1 741 237 39 741 237 39 Total 6 3 4 $ 3,698 $ 299 $ 4,083 $ 3,698 $ 299 $ 4,083 All TDRs at December 31, 2017 and December 31, 2016 were performing in compliance with their modified terms, except for four non-accrual loans totaling $553 thousand at December 31, 2017 and one non-accrual loan totaling $66 thousand at December 31, 2016. The following table provides information on how loans were modified as a TDR for the years ended December 31, 2017 and 2016. December 31, 2017 2016 2015 (In thousands) Maturity Concession $ 638 $ 299 $ — Maturity/amortization concession — — 825 Maturity and payment concession 1,925 — 3,258 Maturity and rate concession 1,032 — — Payment concession 103 — — Total $ 3,698 $ 299 $ 4,083 There were 3 loans modified in a troubled debt restructuring, for which there was a payment default during the year ended December 31, 2017. The total recorded investment in these loans was $1.2 million at December 31, 2017. There were no loans modified in a troubled debt restructuring, for which there was a payment default during the years ended December 31, 2016 and 2015, respectively.

Premises and equipment

Premises and equipment	12 Months Ended
	Dec. 31, 2017
Property, Plant and Equipment [Abstract]
Premises and equipment	7. Premises and equipment At December 31, 2017 and 2016, premises and equipment consisted of the following: December 31, 2017 2016 (In thousands) Land $ 2,300 $ 2,300 Building 14,030 14,061 Leasehold improvements 4,558 4,532 Furniture and fixtures 3,096 2,118 Equipment 4,478 4,249 Automobiles 67 67 28,529 27,327 Accumulated depreciation and amortization (10,333 ) (9,492 ) Premises and equipment, net $ 18,196 $ 17,835 For the years ended December 31, 2017, 2016 and 2015, depreciation and amortization expense related to premises and equipment totaled $1.5 million, $1.7 million and $1.7 million, respectively.

Other Assets

Other Assets	12 Months Ended
	Dec. 31, 2017
Other Assets [Abstract]
Other Assets	8. Other Assets The components of other assets as of December 31, 2017 and 2016 are summarized below: December 31, 2017 2016 (In thousands) Deferred Compensation $ 4,097 $ 3,582 Servicing Asset 1,113 — Derivative Assets 2,035 966 Other 3,203 2,626 Total Other Assets $ 10,448 $ 7,174 Loan Servicing The Bank sells loans in the secondary market and retains the ability to service many of these loans. The Bank earns fees for the servicing provided. Loans serviced for others are not included in the accompanying consolidated balance sheets. The balance of loans serviced for others was $122.8 million and $121.8 at December 31, 2017 and 2016, respectively. The risks inherent in servicing assets relate primarily to changes in prepayments that result from shifts in interest rates. The significant assumptions used in the valuation at year-end 2017 included a discount rate ranging from 7% to 12% and pre-payment speed assumptions ranging from 7% to 9%. The carrying value of loan servicing rights was $1.1 million and $0 as of December 31, 2017 and 2016, respectively. At December 31, 2017 the carrying value of loan servicing rights approximated the fair value. The following table presents the changes in carrying value for loan servicing assets: December 31, (In thousands) Loan Servicing Rights: Balance at beginning of year $ — Servicing rights capitalized 115 Servicing rights amortized (58 ) Servicing rights not previously capitalized 1,056 Balance at end of year $ 1,113 Included in accrued expenses and other liabilities, as of December 31, 2017, is $83 thousand for loan servicing liabilities related to loans serviced for others for which the Company does not receive a servicing fee.

Deposits

Deposits	12 Months Ended
	Dec. 31, 2017
Deposits [Abstract]
Deposits	9. Deposits At December 31, 2017 and 2016, deposits consisted of the following: December 31, 2017 2016 (In thousands) Noninterest bearing demand deposit accounts $ 172,638 $ 187,593 Interest bearing accounts: NOW and money market 510,746 403,081 Savings 83,758 96,502 Time certificates of deposit 631,263 601,861 Total interest bearing accounts 1,225,767 1,101,444 Total deposits $ 1,398,405 $ 1,289,037 Maturities of time certificates of deposit as of December 31, 2017 and 2016 are summarized below: December 31, 2017 2016 (In thousands) 2017 $ — $ 323,742 2018 391,509 247,517 2019 214,383 29,778 2020 24,466 433 2021 373 391 2022 532 — $ 631,263 $ 601,861 The aggregate amount of individual certificate accounts, excluding brokered deposits with balances of $250,000 or more were approximately $153.8 million and $148.5 million at December 31, 2017 and 2016, respectively. Brokered deposits totaled $44.3 million and $58.2 million at December 31, 2017 and 2016, respectively. Brokered deposits with balances of  $250,000 or more were approximately $43.5 million and $57.0 million at December 31, 2017 and 2016, 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, 2017, 2016 and 2015: Years Ended December 31, 2017 2016 2015 (In thousands) NOW and money market $ 3,520 $ 1,945 $ 1,473 Savings 763 315 693 Time certificates of deposit 8,411 6,040 3,515 Total interest expense on deposits $ 12,694 $ 8,300 $ 5,681

Federal Loan Bank Advances and

Federal Loan Bank Advances and Other Borrowings	12 Months Ended
	Dec. 31, 2017
Advances from Federal Home Loan Banks [Abstract]
Federal Loan Bank Advances and Other Borrowings	10. 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, 2017 and 2016: December 31, 2017 2016 Amount Weighted Amount Weighted (Dollars in thousands) Year of Maturity: 2017 $ — — % $ 135,000 0.73 % 2018 174,000 1.44 — — 2020 25,000 1.99 25,000 1.99 Total advances $ 199,000 1.51 % $ 160,000 0.92 % $150.0 million of the above mentioned FHLB advances as of December 31, 2017 are subject to interest rate swap transactions, see note 18. Interest expense on FHLB advances totaled $2.0 million, $1.3 million and $903 thousand for the years ended December 31, 2017, 2016 and 2015, respectively. 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. At December 31, 2017, the Company had pledged $742 million of eligible loans as collateral to support borrowing capacity at the FHLB of Boston. As of December 31, 2017 the Company has immediate availability to borrow an additional $257.6 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, 2017 and 2016. The Bank has an unsecured line of credit with Atlantic Community Bankers Bank of  $7.5 million at December 31, 2017 and 2016, none of which was outstanding at December 31, 2017 and 2016. In addition, the Bank has an unsecured line of credit with Zion’s Bank of  $25.0 million at December 31, 2017, none of which was outstanding at December 31, 2017. The Bank did not have a line of credit with Zion’s Bank at December 31, 2016. 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 91,827 and 79,430 shares at December 31, 2017 and 2016, respectively. There is no ready market or quoted market values for the stock and as such is classified as restricted stock. The shares have a par value of  $100 and are carried on the consolidated balance sheets at cost, and evaluated for impairment, as the stock is only redeemable at par subject to the redemption practices of the FHLB. The determination of whether the par value will ultimately be recovered is influenced by criteria such as the following: (a) the significance of the decline in net assets of the Federal Home Loan Bank as compared to the capital stock amount and the length of time this situation has persisted; (b) commitments by the Federal Home Loan Bank to make payments required by law or regulation and the level of such payments in relation to the operating performance; (c) the impact of legislative and regulatory changes on the customer base of the Federal Home Loan Bank; and (d) the liquidity position of the Federal Home Loan Bank. Management evaluated the stock and concluded that the stock was not impaired as of December 31, 2017 and 2016.

Subordinated Debentures

Subordinated Debentures	12 Months Ended
	Dec. 31, 2017
Subordinated Borrowings [Abstract]
Subordinated Debentures	11. 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. We used the net proceeds for general corporate purposes, which included maintaining liquidity at the holding company, providing equity capital to the Bank to fund balance sheet growth and our working capital needs. The Notes were assigned an investment grade rating of BBB by Kroll Bond Rating Agency, which was reaffirmed in the third quarter of 2017.

Commitments and Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2017
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	12. 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 $21.7 million and $19.2 million at December 31, 2017 and 2016, respectively. The lease obligations at December 31, 2017 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 $144 thousand per year and may be adjusted to fair market value in subsequent years. Future minimum rental commitments under the terms of these leases for the year ended December 31, 2017 was as follows: 2017 (In thousands) Period Ending December 31, 2018 $ 1,808 2019 1,774 2020 1,666 2021 1,561 2022 937 Thereafter 13,977 $ 21,723 Total rental expense approximated $1.8 million, $2.0 million and $1.8 million for the years ended December 31, 2017, 2016 and 2015, 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 represent the amounts of potential accounting loss should the contract be fully drawn upon, the customers 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, 2017 and 2016 were as follows: December 31, 2017 2016 (In thousands) Commitments to extend credit: Loan commitments $ 112,649 $ 89,825 Undisbursed construction loans 80,064 70,526 Unused home equity lines of credit 7,573 8,083 $ 200,286 $ 168,434 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. These commitments subject the Company to potential exposure in excess of amounts recorded in the financial statements, and therefore, management maintains a specific reserve for unfunded credit commitments. This reserve is reported as a component of accrued expenses and other liabilities in the accompanying Consolidated Balance Sheets. The reserve for unfunded commitments totaled $250 thousand at December 31, 2017.

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Income Taxes	13. Income Taxes The components of income tax expense (benefit) for the years ended December 31, 2017, 2016 and 2015 consisted of: 2017 2016 2015 (In thousands) Current provision: Federal $ 7,468 $ 6,838 $ 5,113 State 431 226 694 Total current 7,899 7,064 5,807 Deferred provision (benefit): Federal 3,400 (1,104 ) (1,749 ) State — — 783 Total deferred 3,400 (1,104 ) (966 ) Total income tax expense $ 11,299 $ 5,960 $ 4,841 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 determined in accordance with the statutory requirements for a passive investment company and the 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. On December 22, 2017 the Tax Cuts and Jobs Act of 2017 was signed into law. As a result, the corporate tax rate was reduced from 35% to 21%. Companies are required to recognize the effect of tax law changes in the period of enactment in accordance with GAAP. As result of the tax law changes the Company recognized a write-down of its deferred tax asset in the amount of  $3.3 million. 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, 2017, 2016 and 2015 was as follows: December 31, 2017 2016 2015 (In thousands) Income tax expense at statutory federal rate $ 8,795 $ 6,409 $ 4,855 State tax expense, net of federal tax effect 280 147 566 Statutory rate reductions 3,270 — 811 Income exempt from tax (822 ) (687 ) (627 ) Benefits related to stock compensation (490 ) — — Other items, net 266 91 42 Income tax expense before change in valuation allowance 11,299 5,960 5,647 Change in valuation allowance — — (806 ) Income tax expense $ 11,299 $ 5,960 $ 4,841 At December 31, 2017 and 2016, the components of deferred tax assets and liabilities were as follows: December 31, 2017 2016 (In thousands) Deferred tax assets: Allowance for loan losses $ 4,022 $ 6,378 Net operating loss carryforwards 555 996 Purchase accounting adjustments 14 20 Deferred fees 1,162 1,437 Deferred expenses — 716 Start-up costs 144 275 Depreciation 67 — Other 88 192 Gross deferred tax assets 6,052 10,014 Deferred tax liabilities: Deferred Expenses 482 — Servicing Rights 216 — Tax bad debt reserve — 195 Depreciation — 255 Unrealized gain on derivatives 427 258 Unrealized gain on available for sale securities 23 221 Gross deferred tax liabilities 1,148 929 Net deferred tax asset $ 4,904 $ 9,085 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. Management evaluated its remaining deferred tax assets and believes no valuation allowances are needed at December 31, 2017. At December 31, 2017, the Company had federal net operating loss carryovers of  $2.6 million. The carryovers were transferred to the Company upon the merger 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, 2017 management has established a reserve for uncertain tax positions in conjunction with our out of state lending activity and for a potential tax liability as a result of the Company’s deferred compensation plan established for the board of directors. The total reserve for uncertain tax positions totaled $393 thousand as of December 31, 2017. The tax years 2014 and subsequent, are subject to examination by federal and state taxing authorities. The statute of limitations has expired on the years before 2014. No examinations are currently in process. The following table reflects a reconciliation of the beginning and ending balances of the Company’s uncertain tax positions: December 31, 2017 2016 2015 (In thousands) Balance, beginning of year $ 95 $ — $ — Additions relating to potential liability with taxing authorities 298 95 — Balance, end of year $ 393 $ 95 $ —

401(K) Profit Sharing Plan

401(K) Profit Sharing Plan	12 Months Ended
	Dec. 31, 2017
Compensation and Retirement Disclosure [Abstract]
401(K) Profit Sharing Plan	14. 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 $257 thousand, $227 thousand and $173 thousand related to the 401k Plan during the years ended December 31, 2017, 2016 and 2015, respectively.

Earnings Per Share

Earnings Per Share	12 Months Ended
	Dec. 31, 2017
Earnings Per Share [Abstract]
Earnings Per Share	15. Earnings Per Share Unvested restricted stock awards that contain non-forfeitable rights to dividends, are participating securities, and are included in the computation of EPS pursuant to the two-class method. The two-class method is an earnings allocation formula that determines EPS for each class of common stock and participating security according to dividends declared (or accumulated) and participation rights in undistributed earnings. The Company’s unvested restricted stock awards qualify as participating securities. Net income is allocated between the common stock and participating securities pursuant to the two-class method. Basic EPS is computed by dividing net income available to common shareholders by the weighted average number of common shares outstanding during the period, excluding participating unvested restricted stock awards. Diluted EPS is computed in a similar manner, except that the denominator includes the number of additional common shares that would have been outstanding if potentially dilutive common shares were issued using the treasury stock method. 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, 2017 2016 2015 (In thousands, except per share data) Net income $ 13,830 $ 12,350 $ 9,030 Preferred stock dividends — — (125 ) Dividends to participating securities (1) (28 ) (27 ) (5 ) Undistributed earnings allocated to participating securities (1) (151 ) (211 ) (226 ) Net income for earnings per share calculation $ 13,651 $ 12,112 $ 8,674 Weighted average shares outstanding, basic 7,572 7,396 7,072 Effect of dilutive equity-based awards (2) 98 95 69 Weighted average shares outstanding, diluted 7,670 7,491 7,141 Net earnings per common share: Basic earnings per common share $ 1.80 $ 1.64 $ 1.23 Diluted earnings per common share 1.78 1.62 1.21 (1) Represents dividends paid and undistributed earnings allocated to unvested stock-based awards that contain non-forfeitable rights to dividends. (2) Represents the effect of the assumed exercise of stock options and warrants and the vesting of restricted shares, as applicable, utilizing the treasury stock method.

Stock Based Compensation Plans

Stock Based Compensation Plans	12 Months Ended
	Dec. 31, 2017
Compensation and Retirement Disclosure [Abstract]
Stock Based Compensation Plans	16. 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, 2017, there were 465,262 shares reserved for future issuance under the 2012 Plan. Stock Options There were no options granted during the years ended December 31, 2017, 2016 and 2015. A summary of the status of outstanding stock options at December 31, 2017 and changes during the periods then ended, were as follows: December 31, 2017 Number of Weighted Options outstanding at beginning of period 120,988 $ 18.58 Exercised (73,738 ) 19.06 Forfeited (200 ) 15.00 Options outstanding at end of period 47,050 17.83 Options exercisable at end of period 47,050 17.83 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, 2017, 2016 and 2015 was $1.08 million, $597 thousand and $170, respectively. The range of exercise prices for the 47,050 options exercisable at December 31, 2017 was $11.00 to $20.81 per share. The weighted average remaining contractual life for these options was 2.8 years at December 31, 2017. At December 31, 2017, as all awarded options have vested, all of the outstanding options are exercisable, and the aggregate intrinsic value of these options was $0.8 million. The following table summarizes information for options, all of which are both outstanding and exercisable, at December 31, 2017: Range of Exercise Prices Number of Weighted- Weighted- $17.86 – 20.81 34,700 2.8 $ 19.28 $11.00 – 15.00 12,350 3.0 13.77 47,050 2.8 $ 17.83 Restricted Stock The following table presents the activity for restricted stock for the year ended December 31, 2017: December 31, 2017 Number of Weighted Unvested at beginning of period 96,594 $ 19.80 Granted 40,250 34.03 Vested (43,430 ) 21.35 Forfeited (18,228 ) 20.52 Unvested at end of period 75,186 26.39 The total fair value of restricted stock awards vested during the year ended December 31, 2017 was $1.5 million. The Company’s restricted stock expense for the years ended December 31, 2017, 2016 and 2015 was $917 thousand, $1.2 million and $1.0 million, respectively. At December 31, 2017 there was $1.8 million of unrecognized stock compensation expense for restricted stock, expected to be recognized over a weighted average period of 1.8 years. 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 having vested 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 expensed 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 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 $0, $304 thousand and $134 thousand in stock compensation expense for the years ended December 31, 2017, 2016 and 2015 for these restricted stock awards, respectively. As of December 31, 2017 the Company had no outstanding market conditions restricted stock.

Comprehensive Income

Comprehensive Income	12 Months Ended
	Dec. 31, 2017
Comprehensive Income [Abstract]
Comprehensive Income	17. 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 unrealized 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, 2017, 2016 and 2015 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, 2017, 2016 and 2015: Net Unrealized Gain Net Unrealized Gain Total (In thousands) Balance at December 31, 2016 $ 409 $ 481 $ 890 Other comprehensive (loss) income before reclassifications, net of tax (232 ) 843 611 Amounts reclassified from accumulated other comprehensive income, net of tax (108 ) — (108 ) Net other comprehensive income (340 ) 843 503 Amount reclassified for tax rate changes 16 285 301 Balance at December 31, 2017 $ 85 $ 1,609 $ 1,694 Net Unrealized Gain Net Unrealized Gain Total (In thousands) Balance at December 31, 2015 $ 405 $ (178 ) $ 227 Other comprehensive (loss) income before reclassifications, net of tax (71 ) 659 588 Amounts reclassified from accumulated other comprehensive 75 — 75 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) income before reclassifications, net of tax (239 ) (65) (304) Amounts reclassified from accumulated other comprehensive income — — — Net other comprehensive loss (239 ) (65) (304) Balance at December 31, 2015 $ 405 $(178) $227 The following table provides information for the items reclassified from accumulated other comprehensive income or loss: Accumulated Other Comprehensive For the Years Ended December 31, Associated Line Item in the Consolidated 2017 2016 2015 (In thousands) Available-for-sale securities: Unrealized gains (losses) on investments $ 165 $ (115 ) $ — Gain (loss) on sale of available for sale securities, net Tax (expense) benefit (57 ) 40 — Income tax expense Net of tax $ 108 $ (75 ) $ —

Derivative Instruments

Derivative Instruments	12 Months Ended
	Dec. 31, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Instruments	18. Derivative Instruments The Company manages economic risks, including interest rate, liquidity, and credit risk by managing the amount, sources, and duration of its funding along with the use of interest rate derivative financial instruments, namely interest rate swaps. The Company does not use derivatives for speculative purposes. As of December 31, 2017, the Bank was a party to six interest rate swaps to add stability to interest expense and to manage its exposure to interest rate movements. The notional amount for each swap is $25 million and in each case, the Bank has entered into pay-fixed Libor interest rate swaps to convert rolling 90 day Federal Home Loan Bank advances to fixed rates. The Company accounts for its interest rate swaps as effective cash flow hedges (see Note 1). None of the interest rate swap agreements contain any credit risk related contingent features. A hedging instrument is expected at inception to be highly effective at offsetting changes in the hedged transactions attributable to the changes in the hedged risk. The Company expects that the hedging relationship will be highly effective; however, it does not assume there is no ineffectiveness. As of December 31, 2017 and 2016 there was an immaterial amount of ineffectiveness as a result of these hedging relationships. Interest Rate Swaps with a positive fair value are recorded as other assets and interest rate swaps with a negative fair value are recorded as other liabilities on the consolidated balance sheets. Information about derivative instruments for the years ended December 31, 2017 and 2016 were as follows: December 31, 2017: Notional Original Received Paid Fair Value (Dollars in thousands) Cash flow hedge: Interest rate swap on FHLB advance $ 25,000 4.7 years 3-month USD LIBOR 1.62 % $ 62 Interest rate swap on FHLB advance 25,000 5.0 years 3-month USD LIBOR 1.83 % 105 Interest rate swap on FHLB advance 25,000 5.0 years 3-month USD LIBOR 1.48 % 398 Interest rate swap on FHLB advance 25,000 5.0 years 3-month USD LIBOR 1.22 % 793 Interest rate swap on FHLB advance 25,000 7.0 years 3-month USD LIBOR 2.04 % 342 Interest rate swap on FHLB advance 25,000 7.0 years 3-month USD LIBOR 2.04 % 334 $ 150,000 $ 2,034 December 31, 2016: Notional Original Received Paid Fair Value (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 $ 100,000 $ 737 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 Company 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 interest rate swap assets are presented in other assets and the interest rate swap liabilities are presented in accrued expenses and other liabilities in the consolidated balance sheets. The Company’s cash flow hedge positions are all forward starting interest rate swap transactions. The Company 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 FHLB 90-day advance 25,000 August 25, 2017 7.0 years Bank of Montreal FHLB 90-day advance 25,000 August 25, 2017 7.0 years FTN Financial Capital Markets $ 150,000 This hedge strategy converts the floating rate of interest on short term FHLB advances to fixed interest rates, thereby protecting the Company 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, 2017 and 2016: December 31, December 31, (In thousands) Interest rate swap on FHLB advance: Unrealized gain recognized in accumulated other comprehensive income $ 1,297 $ 1,013 Income tax expense on items recognized in accumulated other comprehensive (454 ) (354 ) Other comprehensive income $ 843 $ 659 Amount recognized in interest expense on hedged FHLB advance $ 1,909 $ 1,386

Fair Value of Financial Instrum

Fair Value of Financial Instruments	12 Months Ended
	Dec. 31, 2017
Fair Value Disclosures [Abstract]
Fair Value of Financial Instruments	19. 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 limitations 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 Company assumes interest rate risk (the risk that general interest rate levels will change) as a result of its normal operations. As a result, the fair values of the Company’s financial instruments will change when interest rate levels change and that change may be either favorable or unfavorable to the Company. Management attempts to match maturities of assets and liabilities to the extent believed necessary to minimize interest rate risk. However, borrowers with fixed rate obligations are less likely to prepay in a rising rate environment and more likely to prepay in a falling rate environment. Conversely, depositors who are receiving fixed rates are more likely to withdraw funds before maturity in a rising rate environment and less likely to do so in a falling rate environment. Management monitors rates and maturities of assets and liabilities and attempts to minimize interest rate risk. The carrying values, fair values and placement in the fair value hierarchy of the Company’s financial instruments at December 31, 2017 and 2016 were as follows: December 31, 2017 Carrying Fair Level 1 Level 2 Level 3 (In thousands) Financial Assets: Cash and due from banks $ 70,545 $ 70,545 $ 70,545 $ — $ — Federal funds sold 186 186 186 — — Available for sale securities 92,188 92,188 — 92,188 — Held to maturity securities 21,579 22,836 — 1,119 21,717 Loans receivable, net 1,520,879 1,494,599 — — 1,494,599 Accrued interest receivable 5,910 5,910 — 5,910 — FHLB stock 9,183 9,183 — 9,183 — Servicing asset 1,113 1,113 — — 1,113 Derivative asset 2,034 2,034 — 2,034 — Financial Liabilities: Demand deposits $ 172,638 $ 172,638 $ — $ 172,638 $ — NOW and money market 510,746 510,746 — 510,746 — Savings 83,758 83,758 — 83,758 — Time deposits 631,263 629,532 — — 629,532 Accrued interest payable 1,092 1,092 — 1,092 — Advances from the FHLB 199,000 198,932 — — 198,932 Subordinated debentures 25,103 25,457 — — 25,457 Servicing liability 83 83 — — 83 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 — 1,141 15,710 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 966 966 — 966 — 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 Accrued interest payable 837 837 — 837 — Advances from the FHLB 160,000 160,118 — — 160,118 Subordinated debentures 25,051 25,645 — — 25,645 Derivative liability 229 229 — 229 — 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, accrued interest receivable and accrued interest payable: The carrying amount is a reasonable estimate of fair value. Available for sale and held to maturity securities: FHLB stock: Loans held for sale: The fair value is based upon prevailing market prices for similar loans. Loans receivable Derivative asset (liability): Servicing Asset (liability): Deposits: Borrowings and Subordinated Debentures: Off-balance-sheet instruments:

Fair Value Measurements

Fair Value Measurements	12 Months Ended
	Dec. 31, 2017
Fair Value Disclosures [Abstract]
Fair Value Measurements	20. 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, 2017 and 2016, 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, 2017 and 2016. Fair Value Level 1 Level 2 Level 3 (In thousands) December 31, 2017: Available for sale investment securities: U.S. Government and agency obligations $ — $ 72,774 $ — State agency and municipal obligations — 12,277 — Corporate bonds — 7,137 — Derivative asset, net — 2,034 — December 31, 2016: Available for sale investment securities: U.S. Government and agency obligations $ — $ 62,698 $ — State agency and municipal obligations — 14,763 — Corporate bonds — 10,290 — Derivative asset, net — 737 — 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 GAAP. 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, 2017 and 2016, 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, 2017: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Impaired loans ​ ​ ​ $ — ​ ​ ​ ​ $ — ​ ​ ​ ​ $ 14,853 ​ ​ Foreclosed real estate ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ December 31, 2016: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Impaired loans ​ ​ ​ $ — ​ ​ ​ ​ $ — ​ ​ ​ ​ $ 4,849 ​ ​ Foreclosed real estate ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ 272 ​ ​ 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, 2017 and 2016: ​ ​ ​ Fair ​ ​ Valuation ​ ​ Unobservable ​ ​ Range ​ ​ ​ ​ (Dollars in thousands) ​ December 31, 2017: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Impaired loans ​ ​ ​ $ 7,711 ​ ​ ​ Appraisals ​ ​ Discount to appraised value ​ ​ 8.00 – 24.00% ​ ​ ​ ​ ​ ​ 7,142 ​ ​ ​ Discounted cash flows ​ ​ Discount rate ​ ​ 3.25 – 6.75% ​ ​ ​ ​ ​ $ 14,853 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Foreclosed real estate ​ ​ ​ $ — ​ ​ ​ Appraisals ​ ​ Discount to appraised value ​ ​ — ​ December 31, 2016: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Impaired loans ​ ​ ​ $ 2,127 ​ ​ ​ Appraisals ​ ​ Discount to appraised value ​ ​ 8.00 – 28.00% ​ ​ ​ ​ ​ ​ 2,722 ​ ​ ​ Discounted cash flows ​ ​ Discount rate ​ ​ 4.25 – 6.25% ​ ​ ​ ​ ​ $ 4,849 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Foreclosed real estate ​ ​ ​ $ 272 ​ ​ ​ Appraisals ​ ​ Discount to appraised value ​ ​ 20% ​ Impaired loans Foreclosed real estate:

Regulatory Matters

Regulatory Matters	12 Months Ended
	Dec. 31, 2017
Banking and Thrift [Abstract]
Regulatory Matters	21. 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 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 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 100-200 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% of regulatory risk based capital ratios in addition to the amount necessary to meet its minimum risk-based capital requirements. The required minimum conservation buffer began to be phased in incrementally, starting at 0.625% on January 1, 2016, increased to 1.25% on January 1, 2017, increased to 1.875% on January 1, 2018 and will continue to increase to 2.5% on January 1, 2019. 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, 2017, 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, 2017 were as follows: Actual Capital For Capital To be Well Amount Ratio Amount Ratio Amount Ratio (Dollars in thousands) Bankwell Bank December 31, 2017 Common Equity Tier 1 Capital to Risk-Weighted Assets $ 173,728 10.99 % $ 71,106 4.50 % $ 102,709 6.50 % Total Capital to Risk-Weighted Assets 192,632 12.19 % 126,411 8.00 % 158,014 10.00 % Tier I Capital to Risk-Weighted Assets 173,728 10.99 % 94,808 6.00 % 126,411 8.00 % Tier I Capital to Average Assets 173,728 9.61 % 72,349 4.00 % 90,437 5.00 % Bankwell Financial Group, Inc. December 31, 2017 Common Equity Tier 1 Capital to Risk-Weighted Assets $ 155,977 9.83 % $ 71,369 4.50 % N/A N/A Total Capital to Risk-Weighted Assets 199,984 12.61 % 126,878 8.00 % N/A N/A Tier I Capital to Risk-Weighted Assets 155,977 9.83 % 95,159 6.00 % N/A N/A Tier I Capital to Average Assets 155,977 8.59 % 72,663 4.00 % N/A N/A The capital amounts and ratios for the Bank and 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 10.39 % $ 61,231 4.50 % N/A N/A Total Capital to Risk-Weighted Assets 184,371 13.55 % 108,855 8.00 % N/A N/A Tier I Capital to Risk-Weighted Assets 141,338 10.39 % 81,641 6.00 % N/A N/A Tier I Capital to Average Assets 141,338 9.06 % 62,415 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, 2017
Related Party Transactions [Abstract]
Related Party Transactions	22. 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, 2017 and 2016 were as follows: December 31, 2017 2016 (In thousands) Balance, beginning of year $ 22,471 $ 12,891 Additional loans 3,082 9,722 Repayments and changes in status (4,832 ) (142 ) Balance, end of year $ 20,721 $ 22,471 Related party deposits aggregated approximately $45.4 million and $40.4 million at December 31, 2017 and 2016, respectively. During the years ended December 31, 2017 and 2016, the Company paid approximately $133 thousand and $28 thousand, respectively, to related parties for services provided to the Company. The payments were primarily for consulting and legal services. In addition, the Company leases a building from a related party, annual lease payments total approximately $534 thousand.

Parent Corporation Only Financi

Parent Corporation Only Financial Statements	12 Months Ended
	Dec. 31, 2017
Parent Corporation Only Financial Statements [Abstract]
Parent Corporation Only Financial Statements	23. 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, 2017 2016 (Dollars in Thousands) ASSETS Cash and due from banks $ 2,494 $ 5,677 Investment in subsidiary 178,778 162,162 Premises and equipment, net 17 55 Deferred income taxes, net 53 3,063 Other assets 9,068 3,889 Total assets $ 190,410 $ 174,846 LIABILITIES AND SHAREHOLDERS’ EQUITY Subordinated debentures $ 25,103 $ 25,051 Accrued expenses and other liabilities 4,280 3,900 Stockholders’ equity 161,027 145,895 Total liabilities and stockholders’ equity $ 190,410 $ 174,846 Condensed Statements of Income Year Ended December 31, 2017 2016 2015 (Dollars in Thousands) Interest income $ 13 $ 23 $ 38 Other income — — — Total income 13 23 38 Expenses 2,295 3,444 2,714 Loss before equity in undistributed earnings of subsidiaries (2,282 ) (3,421 ) (2,676 ) Equity in undistributed earnings of subsidiaries 16,112 15,771 11,706 Net Income $ 13,830 $ 12,350 $ 9,030 Condensed Statements of Cash Flows For the Years Ended December 31, 2017 2016 2015 (Dollars in Thousands) Cash flows from operating activities Net income $ 13,830 $ 12,350 $ 9,030 Adjustments to reconcile net income to net cash used by operating activities: Equity in undistributed earnings (16,112 ) (15,771 ) (11,706 ) Increase in other assets (5,179 ) (1,828 ) (418 ) Decrease (Increase) in deferred income taxes, net 3,010 2,385 (2,192 ) Increase in other liabilities 380 1,620 421 Stock-based compensation 917 1,188 1,033 Amortization of debt issuance costs 52 51 — Net cash used by operating activities (3,102 ) (5 ) (3,832 ) Cash flows from investing activities Capital contribution to Bankwell Bank — — (15,000 ) Decrease in premises and equipment, net 37 65 84 Net cash provided by (used by) investing activities 37 65 (14,916 ) 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 & warrants 2,031 1,106 501 Dividends paid on common stock (2,149 ) (1,661 ) (376 ) Dividends paid on preferred stock — — (125 ) Proceeds from issuance of common stock — 200 3,780 Net tax benefit related to stock-based compensation — 280 — Net cash (used by) provided by financing activities (118 ) (75 ) 17,800 Net decrease in cash and cash equivalents (3,183 ) (15 ) (948 ) Cash and cash equivalents: Beginning of year 5,677 5,692 6,640 End of year $ 2,494 $ 5,677 $ 5,692 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, 2017
Quarterly Financial Information Disclosure [Abstract]
Quarterly Financial Information of Bankwell Financial Group, Inc. (Unaudited)	24. Quarterly Financial Information of Bankwell Financial Group, Inc. (Unaudited) The following table presents selected quarterly financial information (unaudited): ​ ​ ​ ​ ​ ​ ​ ​ ​ 2017 ​ ​ ​ ​ 4th Quarter ​ ​ 3rd Quarter ​ ​ 2nd Quarter ​ ​ 1st Quarter ​ Total interest income ​ ​ ​ $ 18,729 ​ ​ ​ ​ $ 18,348 ​ ​ ​ ​ $ 17,688 ​ ​ ​ ​ $ 16,436 ​ ​ Total interest expense ​ ​ ​ ​ 4,815 ​ ​ ​ ​ ​ 4,487 ​ ​ ​ ​ ​ 4,047 ​ ​ ​ ​ ​ 3,488 ​ ​ Net interest income ​ ​ ​ ​ 13,914 ​ ​ ​ ​ ​ 13,861 ​ ​ ​ ​ ​ 13,641 ​ ​ ​ ​ ​ 12,948 ​ ​ (Credit) Provision for loan losses ​ ​ ​ ​ (495 ) ​ ​ ​ ​ ​ 398 ​ ​ ​ ​ ​ 895 ​ ​ ​ ​ ​ 543 ​ ​ Non-interest income ​ ​ ​ ​ 1,541 ​ ​ ​ ​ ​ 824 ​ ​ ​ ​ ​ 998 ​ ​ ​ ​ ​ 1,266 ​ ​ Non-interest expense ​ ​ ​ ​ 8,579 ​ ​ ​ ​ ​ 8,129 ​ ​ ​ ​ ​ 7,581 ​ ​ ​ ​ ​ 8,234 ​ ​ Income before income taxes ​ ​ ​ ​ 7,371 ​ ​ ​ ​ ​ 6,158 ​ ​ ​ ​ ​ 6,163 ​ ​ ​ ​ ​ 5,437 ​ ​ Provision from income taxes ​ ​ ​ ​ 5,275 ​ ​ ​ ​ ​ 1,895 ​ ​ ​ ​ ​ 2,394 ​ ​ ​ ​ ​ 1,735 ​ ​ Net income ​ ​ ​ $ 2,096 ​ ​ ​ ​ $ 4,263 ​ ​ ​ ​ $ 3,769 ​ ​ ​ ​ $ 3,702 ​ ​ Net income attributable to common stockholders ​ ​ ​ $ 2,096 ​ ​ ​ ​ $ 4,263 ​ ​ ​ ​ $ 3,769 ​ ​ ​ ​ $ 3,702 ​ ​ Earnings per share: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Basic ​ ​ ​ $ 0.27 ​ ​ ​ ​ $ 0.55 ​ ​ ​ ​ $ 0.49 ​ ​ ​ ​ $ 0.49 ​ ​ Diluted ​ ​ ​ $ 0.27 ​ ​ ​ ​ $ 0.55 ​ ​ ​ ​ $ 0.49 ​ ​ ​ ​ $ 0.48 ​ ​ ​ ​ ​ 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 ​ ​ Note: Due to rounding, quarterly earnings per share may not sum to reported annual earnings per share. During the fourth quarter of 2017 the Company had changed its methodology to estimate its allowance for loan losses. The change in methodology resulted in an update to the underlying loan loss assumptions, incorporating the most recent industry, peer and product loss trends. This resulted in a non-recurring, pretax $1.3 million reduction in the reserve. In addition, On December 22, 2017 the Tax Cuts and Jobs Act of 2017 was signed into law. As a result, the corporate tax rate was reduced from 35% to 21%. Companies are required to recognize the effect of tax law changes in the period of enactment in accordance with GAAP. As result of the tax law changes the Company recognized a write-down of its deferred tax asset in the amount of  $3.3 million.

Nature of Operations and Summ33

Nature of Operations and Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2017
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, including its wholly owned passive investment company subsidiary. 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 the allowance for loan losses, stock-based compensation, derivative instrument valuation, investment securities valuation, evaluation of investment securities for other than temporary impairment and deferred income taxes 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 Company 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 the fair value of 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. Transfers of debt securities into the held to maturity classification from the available for sale classification are made at fair value on the date of transfer. The unrealized holding gain or loss on the date of transfer is retained in accumulated other comprehensive income and in the carrying value of the held to maturity securities. Such amounts are amortized over the remaining contractual lives of the securities. When transfers of debt securities into the available for sale classification from the held to maturity classification occur, any unrealized holding gains or losses on the transfer date are recognized in other comprehensive income
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 trade 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. Transfers of financial assets are accounted for as sales when control over the assets has been surrendered. Control over transferred assets is deemed to be surrendered when (1) the assets have been isolated from the Company — put presumptively beyond the reach of the transferor and its creditors, even in bankruptcy or other receivership, (2) the transferee obtains the right (free of conditions that constrain it from taking advantage of that right) to pledge or exchange the transferred assets, and (3) the transferor does not maintain effective control over the transferred assets through either (a) an agreement that both entitles and obligates the transferor to repurchase or redeem the assets before maturity or (b) the ability to unilaterally cause the holder to return specific assets, other than through a cleanup call.
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. Impaired loans also include loans modified in troubled debt restructurings where concessions have been granted to borrowers experiencing financial difficulties. These concessions could include a reduction in the interest rate on the loan, payment extensions, forgiveness of principal, forbearance or other actions intended to maximize collection. 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, including appropriate peer data, adjusted for qualitative factors. 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.
Reserve for Unfunded Commitments	Reserve for Unfunded Commitments The reserve for unfunded commitments provides for probable losses inherent with funding the unused portion of legal commitments to lend. The unfunded reserve calculation includes factors that are consistent with the ALLL methodology for our loan portfolio as well as a draw down factor applied to the various commitments. The reserve for unfunded credit commitments is included within other liabilities in the accompanying Consolidated Balance Sheets, and changes in the reserve are reported as a component of other expense in the accompanying Consolidated Statements of Income. See Note 12: Commitments and Contingencies for further information.
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.
Impairment of Long-Lived Assets	Impairment of Long-Lived Assets Long-lived assets, including premises and equipment, are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable. If impairment is indicated by that review, the asset is written down to its estimated fair value through a charge to noninterest expense.
Servicing Rights	Servicing Rights When loans are sold, on a servicing retained basis, servicing rights are initially recorded at fair value with the income statement effect recorded in service charges and fees income. All classes of servicing assets are subsequently measured using the amortization method which requires servicing rights to be amortized into noninterest income in proportion to, and over the period of, the life of the underlying loans. Servicing rights are evaluated for impairment based upon the fair value of the rights as compared to carrying amount. Any impairment is reported as a valuation allowance, to the extent that fair value is less than the carrying amount. If the Company later determines that all or a portion of the impairment no longer exists, a reduction of the allowance may be recorded as an increase to income. Changes in the valuation allowance are reported with service charges and fees income on the consolidated statements of income. The fair values of servicing rights are subject to fluctuations as a result of changes in estimated and actual prepayment speeds and default rates and losses. Loans serviced for others are not included in the accompanying consolidated balance sheets. Servicing fee income, which is included in service charges and fees on the income statement, is recorded for fees earned for servicing loans. Fees earned for servicing loans are based on a contractual percentage of the outstanding principal amount of the loan and are recorded as income when earned. The amortization of servicing rights is netted against income from service charges and fees.
Income Taxes	Income Taxes The Company recognizes income taxes under the asset and liability method. Under this method, deferred tax assets and liabilities are recognized for the future tax consequences attributable to differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax bases. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which those temporary differences are expected to be recovered or settled. The effect on deferred tax assets and liabilities of a change in tax rates is recognized in income in the period that includes the enactment date. Deferred tax assets are reduced by a valuation allowance when, in the opinion of management, it is more-likely-than-not that all or some portion of the deferred tax assets will not be realized. 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. The portion of the benefits associated with tax positions taken that exceeds the amount measured as described above is reflected as a liability for unrecognized tax benefits along with any associated interest and penalties that would be payable to the taxing authorities upon examination. The Company has $393 thousand and $95 thousand of liabilities for uncertain tax positions at December 31, 2017 and 2016. 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-Scholes 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. The Company recognizes forfeitures as they occur.
Earnings Per Share	Earnings Per Share Unvested restricted stock awards that contain non-forfeitable rights to dividends, are participating securities, and are included in the computation of EPS pursuant to the two-class method. The two-class method is an earnings allocation formula that determines EPS for each class of common stock and participating security according to dividends declared (or accumulated) and participation rights in undistributed earnings. The Company’s unvested restricted stock awards qualify as participating securities. Net income is allocated between the common stock and participating securities pursuant to the two-class method. Basic EPS is computed by dividing net income available to common shareholders by the weighted average number of common shares outstanding during the period, excluding participating unvested restricted stock awards. Diluted EPS is computed in a similar manner, except that the denominator includes the number of additional common shares that would have been outstanding if potentially dilutive common shares were issued using the treasury stock method.
Comprehensive Income	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 unrealized 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, 2017, 2016 and 2015 is reported in the Consolidated Statements of Comprehensive Income.
Fair Values of Financial Instruments	Fair Values of Financial Instruments The Company uses fair value measurements to record fair value adjustments to certain assets and to determine fair value disclosures. Fair value is the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. Fair value is best determined based upon quoted market prices. However, in certain instances, there are no quoted market prices for certain assets or liabilities. 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 rate and estimates of future cash flows. Accordingly, the fair value estimates may not be realized in an immediate settlement of the asset or liability. Fair value measurements focus on exit prices in an orderly transaction (that is, not a forced liquidation or distressed sale) between market participants at the measurement date under current market conditions. If there has been a significant decrease in the volume and level of activity for the asset or liability, a change in valuation technique or the use of multiple valuation techniques may be appropriate. In such instances, determining the price at which willing market participants would transact at the measurement date under current market conditions depends on the facts and circumstances and requires the use of significant judgment. 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 at either December 31, 2017 or December 31, 2016. 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.
Derivative Instruments	Derivative Instruments 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 interest rate swap assets are presented in other assets and the interest rate swap liabilities are presented in accrued expenses and other liabilities in the consolidated balance sheets. The Bank’s cash flow hedge positions are all forward starting interest rate swap transactions. This hedge strategy converts the floating rate of interest on short term FHLB advances to fixed interest rates, thereby protecting the Bank from floating interest rate variability.
Related Party Transactions	Related Party Transactions Directors and officers of the Company and their affiliates have been customers of and have had transactions with the Company, and it is expected that such persons will continue to have such transactions in the future. Management believes that all deposit accounts, loans, services and commitments comprising such transactions were made in the ordinary course of business, on substantially the same terms, including interest rates and collateral, as those prevailing at the time for comparable transactions with other customers who are not directors or officers. In the opinion of management, the transactions with related parties did not involve more than normal risks of collectability, nor favored treatment or terms, nor present other unfavorable features. Note 22 contains details regarding related party transactions.
Reclassification	Reclassification Certain prior period amounts have been reclassified to conform to the 2017 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. 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” ASU No. 2017-04, Intangibles — Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment: ASU No. 2017-08, Receivables — Nonrefundable Fees and Other Costs (subtopic 310-20): Premium Amortization on Purchased Callable Debt Securities: ASU No. 2017-09, Compensation — Stock Compensation (Topic 718): ASU No. 2017-12, Derivatives and Hedging: Targeted Improvements to Accounting for Hedging Activities (Topic 815): ASU 2018-02, Income Statement — Reporting Comprehensive Income (Topic 220):

Goodwill and other intangible34

Goodwill and other intangible assets (Tables)	12 Months Ended
	Dec. 31, 2017
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, 2017 Core deposit intangible $ 1,029 $ 647 $ 382 December 31, 2016 Core deposit intangible $ 1,029 $ 528 $ 501

Investment Securities (Tables)

Investment Securities (Tables)	12 Months Ended
	Dec. 31, 2017
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, 2017 Amortized Gross Unrealized Fair Value Gains Losses (In thousands) Available for sale securities: U.S. Government and agency obligations Due from one through five years $ 13,000 $ — $ (82 ) $ 12,918 Due from five through ten years 100 — (4 ) 96 Due after ten years 59,924 10 (174 ) 59,760 73,024 10 (260 ) 72,774 State agency and municipal obligations Due from one through five years 2,873 84 — 2,957 Due from five through ten years 7,386 228 — 7,614 Due after ten years 1,700 33 (27 ) 1,706 11,959 345 (27 ) 12,277 Corporate bonds Due from one through five years 7,096 41 — 7,137 7,096 41 — 7,137 Total available for sale securities $ 92,079 $ 396 $ (287 ) $ 92,188 Held to maturity securities: State agency and municipal obligations Less Than 1 Year $ 198 5 — $ 203 Due from one through five years 3,880 20 — 3,900 Due after ten years 16,387 1,227 — 17,614 20,465 1,252 — 21,717 Corporate bonds Due from one through five years 1,000 — (5 ) 995 Government-sponsored mortgage backed securities No contractual maturity 114 10 — 124 Total held to maturity securities $ 21,579 $ 1,262 $ (5 ) $ 22,836 December 31, 2016 Amortized Gross Unrealized Fair Value 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 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
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 Percent Fair Unrealized Percent Fair Unrealized Percent (In thousands) December 31, 2017 U.S. Government and agency obligations $ 70,419 (225 ) 0.32 % $ 2,064 (35 ) 1.67 % $ 72,483 $ (260 ) 0.36 % State agency and municipal 92 — 0.16 656 (27 ) 3.95 748 (27 ) 3.50 Corporate bonds — — — 995 (5 ) 0.50 995 (5 ) 0.50 Total investment securities $ 70,511 $ (225 ) 0.32 % $ 3,715 $ (67 ) 1.77 % $ 74,226 $ (292 ) 0.39 % December 31, 2016 U.S. Government and agency obligations $ 3,045 $ (54 ) 1.74 % $ — $ — — $ 3,045 $ (54 ) 1.74 % State agency and municipal 2,756 (123 ) 4.29 — — — 2,756 (123 ) 4.29 Corporate bonds 978 (23 ) 2.25 — — — 978 (23 ) 2.25 Total investment securities $ 6,779 $ (200 ) 2.86 % $ — $ — — $ 6,779 $ (200 ) 2.86 %

Loans Receivable and Allowanc36

Loans Receivable and Allowance for Loan Losses (Tables)	12 Months Ended
	Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable, Gross, Allowance, and Net [Abstract]
Schedule of summary of the loan portfolio	December 31, 2017 December 31, 2016 Originated Acquired Total Originated Acquired Total (In thousands) Real estate loans: Residential $ 186,107 $ 7,417 $ 193,524 $ 187,098 $ 8,631 $ 195,729 Commercial 945,277 41,965 987,242 802,156 43,166 845,322 Construction 101,636 — 101,636 107,329 112 107,441 1,233,020 49,382 1,282,402 1,096,583 51,909 1,148,492 Commercial business 249,719 10,276 259,995 198,456 17,458 215,914 Consumer 192 427 619 672 861 1,533 Total loans 1,482,931 60,085 1,543,016 1,295,711 70,228 1,365,939 Allowance for loan losses (18,848 ) (56 ) (18,904 ) (17,883 ) (99 ) (17,982 ) Deferred loan origination fees, net (3,242 ) — (3,242 ) (4,071 ) — (4,071 ) Unamortized loan premiums 8 — 8 9 — 9 Loans receivable, net $ 1,460,849 $ 60,029 $ 1,520,878 $ 1,273,766 $ 70,129 $ 1,343,895
Schedule of activity in the accretable yields for the acquired loan portfolio	2017 2016 (In thousands) Balance at beginning of period $ 666 $ 871 Accretion (113 ) (154 ) Other (a) — (51 ) Balance at end of period $ 553 $ 666 (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 Commercial Consumer Total (In thousands) December 31, 2017 Originated Beginning balance $ 1,802 $ 9,386 $ 2,105 $ 4,240 $ 350 $ 17,883 Charge-offs — — — (478 ) (32 ) (510 ) Recoveries 146 — — 4 3 153 Provisions (227 ) 3,355 (1,198 ) (288 ) (320 ) 1,322 Ending balance $ 1,721 $ 12,741 $ 907 $ 3,478 $ 1 $ 18,848 Acquired Beginning balance $ — $ 29 $ — $ 43 $ 27 $ 99 Charge-offs — — — (43 ) (19 ) (62 ) Recoveries — — — — — — Provisions — 7 — 20 (8 ) 19 Ending balance $ — $ 36 $ — $ 20 $ — $ 56 Total Beginning balance $ 1,802 $ 9,415 $ 2,105 $ 4,283 $ 377 $ 17,982 Charge-offs — — — (521 ) (51 ) (572 ) Recoveries 146 — — 4 3 153 Provisions (227 ) 3,362 (1,198 ) (268 ) (328 ) 1,341 Ending balance $ 1,721 $ 12,777 $ 907 $ 3,498 $ 1 $ 18,904 Residential Commercial Construction Commercial Consumer Total (In thousands) December 31, 2016 Originated Beginning balance $ 1,618 $ 7,693 $ 1,504 $ 3,310 $ 3 $ 14,128 Charge-offs — — — (59 ) (10 ) (69 ) Recoveries — — — — 8 8 Provisions 184 1,693 601 989 349 3,816 Ending balance $ 1,802 $ 9,386 $ 2,105 $ 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 $ 1,618 $ 7,705 $ 1,504 $ 3,334 $ 8 $ 14,169 Charge-offs — — (7 ) (69 ) (35 ) (111 ) Recoveries — — — — 10 10 Provisions 184 1,710 608 1,018 394 3,914 Ending balance $ 1,802 $ 9,415 $ 2,105 $ 4,283 $ 377 $ 17,982 Residential Commercial Construction Commercial Consumer Total (In thousands) December 31, 2015 Originated Beginning balance $ 1,636 $ 5,480 $ 1,102 $ 2,638 $ 4 $ 10,860 Charge-offs — — — — (6 ) (6 ) Recoveries — — — — 7 7 Provisions (18 ) 2,213 402 672 (2 ) 3,267 Ending balance $ 1,618 $ 7,693 $ 1,504 $ 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 $ 1,636 $ 5,480 $ 1,102 $ 2,638 $ 4 $ 10,860 Charge-offs — — — (15 ) (15 ) (30 ) Recoveries — — — 100 9 109 Provisions (18 ) 2,225 402 611 10 3,230 Ending balance $ 1,618 $ 7,705 $ 1,504 $ 3,334 $ 8 $ 14,169
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, 2017 Loans individually evaluated for impairment: Residential real estate $ 4,168 $ 8 $ 439 $ — $ 4,607 $ 8 Commercial real estate 6,416 842 1,170 34 7,586 876 Commercial business 2,126 51 534 20 2,660 71 Subtotal 12,710 901 2,143 54 14,853 955 Loans collectively evaluated for impairment: Residential real estate 181,939 1,713 6,978 — 188,917 1,713 Commercial real estate 938,861 11,899 40,795 2 979,656 11,901 Construction 101,636 907 — — 101,636 907 Commercial business 247,593 3,427 9,742 — 257,335 3,427 Consumer 192 1 427 — 619 1 Subtotal 1,470,221 17,947 57,942 2 1,528,163 17,949 Total $ 1,482,931 $ 18,848 $ 60,085 $ 56 $ 1,543,016 $ 18,904 Originated Loans Acquired Loans Total Portfolio Allowance Portfolio Allowance Portfolio Allowance (In thousands) December 31, 2016 Loans individually evaluated for impairment: Residential real estate $ 1,228 $ — $ 453 $ — $ 1,681 $ — Commercial real estate 774 1 144 7 918 8 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 185,870 1,802 8,178 — 194,048 1,802 Commercial real estate 801,382 9,385 43,022 22 844,404 9,407 Construction 107,329 2,105 112 — 107,441 2,105 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
Schedule of loan portfolio quality indicators by portfolio segment	Commercial Credit Quality Indicators At December 31, 2017 At December 31, 2016 Commercial Construction Commercial Total Commercial Construction Commercial Total (In thousands) Originated loans: Pass $ 920,216 $ 101,636 $ 242,828 $ 1,264,680 $ 797,249 $ 107,329 $ 196,436 $ 1,101,014 Special mention 9,262 — 4,019 13,281 4,605 — 115 4,720 Substandard 15,799 — 2,872 18,671 302 — 1,905 2,207 Doubtful — — — — — — — — Loss — — — — — — — — Total originated loans 945,277 101,636 249,719 1,296,632 802,156 107,329 198,456 1,107,941 Acquired loans: Pass 40,686 — 9,742 50,428 41,582 112 16,836 58,530 Special mention 109 — — 109 1,584 — 86 1,670 Substandard 1,170 — 425 1,595 — — 536 536 Doubtful — — 109 109 — — — — Loss — — — — — — — — Total acquired loans 41,965 — 10,276 52,241 43,166 112 17,458 60,736 Total loans: Pass 960,902 101,636 252,570 1,315,108 838,831 107,441 213,272 1,159,544 Special mention 9,371 — 4,019 13,390 6,189 — 201 6,390 Substandard 16,969 — 3,297 20,266 302 — 2,441 2,743 Doubtful — — 109 109 — — — — Loss — — — — — — — — Total loans $ 987,242 $ 101,636 $ 259,995 $ 1,348,873 $ 845,322 $ 107,441 $ 215,914 $ 1,168,677 Residential and Consumer Credit Quality Indicators At December 31, 2017 At December 31, 2016 Residential Consumer Total Residential Consumer Total (In thousands) Originated loans: Pass $ 181,939 $ 192 $ 182,131 $ 185,252 $ 331 $ 185,583 Special mention — — — 216 — 216 Substandard 4,168 — 4,168 1,630 — 1,630 Doubtful — — — — — — Loss — — — — 341 341 Total originated loans 186,107 192 186,299 187,098 672 187,770 Acquired loans: Pass 6,978 427 7,405 7,646 835 8,481 Special mention — — — 49 — 49 Substandard 439 — 439 936 2 938 Doubtful — — — — — — Loss — — — — 24 24 Total acquired loans 7,417 427 7,844 8,631 861 9,492 Total loans: Pass 188,917 619 189,536 192,898 1,166 194,064 Special mention — — — 265 — 265 Substandard 4,607 — 4,607 2,566 2 2,568 Doubtful — — — — — — Loss — — — — 365 365 Total loans $ 193,524 $ 619 $ 194,143 $ 195,729 $ 1,533 $ 197,262
Schedule of information with respect to our loan portfolio delinquencies by portfolio segment and amount	As of December 31, 2017 31 – 60 Days 61 – 90 Days Greater Than Total Past Current Total Loans (In thousands) Originated Loans Real estate loans: Residential real estate $ 1,092 $ 2,244 $ 969 $ 4,305 $ 181,802 $ 186,107 Commercial real estate 9,529 4,116 1,444 15,089 930,188 945,277 Construction — — — — 101,636 101,636 Commercial business 4,223 — 142 4,365 245,354 249,719 Consumer — — — — 192 192 Total originated loans 14,844 6,360 2,555 23,759 1,459,172 1,482,931 Acquired Loans Real estate loans: Residential real estate 156 — 192 348 7,069 7,417 Commercial real estate 499 — 630 1,129 40,836 41,965 Commercial business 95 162 339 596 9,680 10,276 Consumer 3 — 2 5 422 427 Total acquired loans 753 162 1,163 2,078 58,007 60,085 Total loans $ 15,597 $ 6,522 $ 3,718 $ 25,837 $ 1,517,179 $ 1,543,016 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 $ — $ 173 $ 969 $ 1,142 $ 185,956 $ 187,098 Commercial real estate 147 1,848 302 2,297 799,859 802,156 Construction — — — — 107,329 107,329 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 — — 453 453 8,178 8,631 Commercial real estate 866 722 143 1,731 41,435 43,166 Construction — — — — 112 112 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
Schedule of nonaccrual loans by portfolio segment	December 31, 2017 2016 (In thousands) Residential real estate $ 1,590 $ 1,612 Commercial real estate 3,371 446 Commercial business 520 538 Consumer — 341 Total $ 5,481 $ 2,937
Schedule of summarizes impaired loans	As of and for the Year Ended December 31, 2017 Carrying Unpaid Associated Average Interest (In thousands) Originated Impaired loans without a valuation allowance: Residential real estate $ 3,076 $ 3,094 $ — $ 3,080 $ — Commercial real estate 859 875 — 881 11 Construction — — — — — Commercial business 1,548 1,548 — 1,621 70 Total impaired loans without a valuation allowance $ 5,483 $ 5,517 $ — $ 5,582 $ 81 Impaired loans with a valuation allowance: Residential real estate $ 1,092 $ 1,092 $ 8 $ 1,100 $ — Commercial real estate 5,557 5,557 842 5,603 261 Commercial business 578 578 51 588 47 Total impaired loans with a valuation allowance 7,227 7,227 901 7,291 308 Total originated impaired loans $ 12,710 $ 12,744 $ 901 $ 12,873 $ 389 Acquired Impaired loans without a valuation allowance: Residential real estate $ 439 $ 462 $ — $ 450 $ — Commercial real estate 982 1,040 — 1,035 10 Commercial Business 402 476 — 488 19 Consumer — — — — — Total impaired loans without a valuation allowance $ 1,823 $ 1,978 $ — $ 1,973 $ 29 Impaired loans with a valuation allowance: Commercial real estate $ 188 $ 188 $ 34 $ 251 $ — Commercial business 132 134 20 285 — Total impaired loans with a valuation allowance 320 322 54 536 — Total acquired impaired loans $ 2,143 $ 2,300 $ 54 $ 2,509 $ 29 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 $ 1,228 $ 1,238 $ — $ 1,236 $ 10 Commercial real estate 651 651 — 668 29 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: 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: Residential real estate $ 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 $ 1,391 $ 1,393 $ — $ 1,402 $ 37 Commercial real estate 4,291 4,291 — 4,308 124 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: Residential real estate $ 197 $ 200 $ — $ 198 $ 2 Commercial real estate 611 678 — 602 6 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
Schedule of loans whose terms were modified as TDRs during the periods	Outstanding Recorded Investment Number of Loans Pre-Modification Post-Modification 2017 2016 2015 2017 2016 2015 2017 2016 2015 (Dollars in thousands) Years ended December 31, Commercial real estate — 1 3 $ — $ 62 $ 4,044 $ — $ 62 $ 4,044 Residential real estate 2 — — 2,957 — — 2,957 — — Commercial business 4 2 1 741 237 39 741 237 39 Total 6 3 4 $ 3,698 $ 299 $ 4,083 $ 3,698 $ 299 $ 4,083
Schedule of information on how loans were modified as a TDR	December 31, 2017 2016 2015 (In thousands) Maturity Concession $ 638 $ 299 $ — Maturity/amortization concession — — 825 Maturity and payment concession 1,925 — 3,258 Maturity and rate concession 1,032 — — Payment concession 103 — — Total $ 3,698 $ 299 $ 4,083

Premises and equipment (Tables)

Premises and equipment (Tables)	12 Months Ended
	Dec. 31, 2017
Property, Plant and Equipment [Abstract]
Schedule of premises and equipment	December 31, 2017 2016 (In thousands) Land $ 2,300 $ 2,300 Building 14,030 14,061 Leasehold improvements 4,558 4,532 Furniture and fixtures 3,096 2,118 Equipment 4,478 4,249 Automobiles 67 67 28,529 27,327 Accumulated depreciation and amortization (10,333 ) (9,492 ) Premises and equipment, net $ 18,196 $ 17,835

Other Assets (Tables)

Other Assets (Tables)	12 Months Ended
	Dec. 31, 2017
Other Assets [Abstract]
Schedule of components of other assets	December 31, 2017 2016 (In thousands) Deferred Compensation $ 4,097 $ 3,582 Servicing Asset 1,113 — Derivative Assets 2,035 966 Other 3,203 2,626 Total Other Assets $ 10,448 $ 7,174
Schedule of Loan Servicing	December 31, (In thousands) Loan Servicing Rights: Balance at beginning of year $ — Servicing rights capitalized 115 Servicing rights amortized (58 ) Servicing rights not previously capitalized 1,056 Balance at end of year $ 1,113

Deposits (Tables)

Deposits (Tables)	12 Months Ended
	Dec. 31, 2017
Deposits [Abstract]
Schedule of deposits	December 31, 2017 2016 (In thousands) Noninterest bearing demand deposit accounts $ 172,638 $ 187,593 Interest bearing accounts: NOW and money market 510,746 403,081 Savings 83,758 96,502 Time certificates of deposit 631,263 601,861 Total interest bearing accounts 1,225,767 1,101,444 Total deposits $ 1,398,405 $ 1,289,037
Schedule of contractual maturities of time certificates of deposit	December 31, 2017 2016 (In thousands) 2017 $ — $ 323,742 2018 391,509 247,517 2019 214,383 29,778 2020 24,466 433 2021 373 391 2022 532 — $ 631,263 $ 601,861
Schedule of interest expense by account type	Years Ended December 31, 2017 2016 2015 (In thousands) NOW and money market $ 3,520 $ 1,945 $ 1,473 Savings 763 315 693 Time certificates of deposit 8,411 6,040 3,515 Total interest expense on deposits $ 12,694 $ 8,300 $ 5,681

Federal Loan Bank Advances an40

Federal Loan Bank Advances and Other Borrowings (Tables)	12 Months Ended
	Dec. 31, 2017
Advances from Federal Home Loan Banks [Abstract]
Schedule of FHLB advances with maturity dates and weighted average rates	December 31, 2017 2016 Amount Weighted Amount Weighted (Dollars in thousands) Year of Maturity: 2017 $ — — % $ 135,000 0.73 % 2018 174,000 1.44 — — 2020 25,000 1.99 25,000 1.99 Total advances $ 199,000 1.51 % $ 160,000 0.92 %

Commitments and Contingencies (

Commitments and Contingencies (Tables)	12 Months Ended
	Dec. 31, 2017
Commitments and Contingencies Disclosure [Abstract]
Schedule of future minimum rental commitments under operating lease	2017 (In thousands) Period Ending December 31, 2018 $ 1,808 2019 1,774 2020 1,666 2021 1,561 2022 937 Thereafter 13,977 $ 21,723
Schedule of Off-balance sheet instruments	December 31, 2017 2016 (In thousands) Commitments to extend credit: Loan commitments $ 112,649 $ 89,825 Undisbursed construction loans 80,064 70,526 Unused home equity lines of credit 7,573 8,083 $ 200,286 $ 168,434

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Schedule of income tax expense	2017 2016 2015 (In thousands) Current provision: Federal $ 7,468 $ 6,838 $ 5,113 State 431 226 694 Total current 7,899 7,064 5,807 Deferred provision (benefit): Federal 3,400 (1,104 ) (1,749 ) State — — 783 Total deferred 3,400 (1,104 ) (966 ) Total income tax expense $ 11,299 $ 5,960 $ 4,841
Schedule of reconciliation of the anticipated income tax expense	December 31, 2017 2016 2015 (In thousands) Income tax expense at statutory federal rate $ 8,795 $ 6,409 $ 4,855 State tax expense, net of federal tax effect 280 147 566 Statutory rate reductions 3,270 — 811 Income exempt from tax (822 ) (687 ) (627 ) Benefits related to stock compensation (490 ) — — Other items, net 266 91 42 Income tax expense before change in valuation allowance 11,299 5,960 5,647 Change in valuation allowance — — (806 ) Income tax expense $ 11,299 $ 5,960 $ 4,841
Schedule of components of deferred tax assets and liabilities	December 31, 2017 2016 (In thousands) Deferred tax assets: Allowance for loan losses $ 4,022 $ 6,378 Net operating loss carryforwards 555 996 Purchase accounting adjustments 14 20 Deferred fees 1,162 1,437 Deferred expenses — 716 Start-up costs 144 275 Depreciation 67 — Other 88 192 Gross deferred tax assets 6,052 10,014 Deferred tax liabilities: Deferred Expenses 482 — Servicing Rights 216 — Tax bad debt reserve — 195 Depreciation — 255 Unrealized gain on derivatives 427 258 Unrealized gain on available for sale securities 23 221 Gross deferred tax liabilities 1,148 929 Net deferred tax asset $ 4,904 $ 9,085
Schedule of reflects a reconciliation of the beginning and ending balances	December 31, 2017 2016 2015 (In thousands) Balance, beginning of year $ 95 $ — $ — Additions relating to potential liability with taxing authorities 298 95 — Balance, end of year $ 393 $ 95 $ —

Earnings Per Share (Tables)

Earnings Per Share (Tables)	12 Months Ended
	Dec. 31, 2017
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, 2017 2016 2015 (In thousands, except per share data) Net income $ 13,830 $ 12,350 $ 9,030 Preferred stock dividends — — (125 ) Dividends to participating securities (1) (28 ) (27 ) (5 ) Undistributed earnings allocated to participating securities (1) (151 ) (211 ) (226 ) Net income for earnings per share calculation $ 13,651 $ 12,112 $ 8,674 Weighted average shares outstanding, basic 7,572 7,396 7,072 Effect of dilutive equity-based awards (2) 98 95 69 Weighted average shares outstanding, diluted 7,670 7,491 7,141 Net earnings per common share: Basic earnings per common share $ 1.80 $ 1.64 $ 1.23 Diluted earnings per common share 1.78 1.62 1.21 (1) Represents dividends paid and undistributed earnings allocated to unvested stock-based awards that contain non-forfeitable rights to dividends. (2) Represents the effect of the assumed exercise of stock options and warrants and the vesting of restricted shares, as applicable, utilizing the treasury stock method.

Stock Based Compensation Plans

Stock Based Compensation Plans (Tables)	12 Months Ended
	Dec. 31, 2017
Compensation and Retirement Disclosure [Abstract]
Schedule of status of outstanding stock options	December 31, 2017 Number of Weighted Options outstanding at beginning of period 120,988 $ 18.58 Exercised (73,738 ) 19.06 Forfeited (200 ) 15.00 Options outstanding at end of period 47,050 17.83 Options exercisable at end of period 47,050 17.83
Schedule of both outstanding and exercisable	Range of Exercise Prices Number of Weighted- Weighted- $17.86 – 20.81 34,700 2.8 $ 19.28 $11.00 – 15.00 12,350 3.0 13.77 47,050 2.8 $ 17.83
Schedule of activity for restricted stock	December 31, 2017 Number of Weighted Unvested at beginning of period 96,594 $ 19.80 Granted 40,250 34.03 Vested (43,430 ) 21.35 Forfeited (18,228 ) 20.52 Unvested at end of period 75,186 26.39

Comprehensive Income (Tables)

Comprehensive Income (Tables)	12 Months Ended
	Dec. 31, 2017
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, 2016 $ 409 $ 481 $ 890 Other comprehensive (loss) income before reclassifications, net of tax (232 ) 843 611 Amounts reclassified from accumulated other comprehensive income, net of tax (108 ) — (108 ) Net other comprehensive income (340 ) 843 503 Amount reclassified for tax rate changes 16 285 301 Balance at December 31, 2017 $ 85 $ 1,609 $ 1,694 Net Unrealized Gain Net Unrealized Gain Total (In thousands) Balance at December 31, 2015 $ 405 $ (178 ) $ 227 Other comprehensive (loss) income before reclassifications, net of tax (71 ) 659 588 Amounts reclassified from accumulated other comprehensive 75 — 75 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) income before reclassifications, net of tax (239 ) (65) (304) Amounts reclassified from accumulated other comprehensive income — — — Net other comprehensive loss (239 ) (65) (304) Balance at December 31, 2015 $ 405 $(178) $227
Schedule of reclassified from accumulated other comprehensive income or loss	Accumulated Other Comprehensive For the Years Ended December 31, Associated Line Item in the Consolidated 2017 2016 2015 (In thousands) Available-for-sale securities: Unrealized gains (losses) on investments $ 165 $ (115 ) $ — Gain (loss) on sale of available for sale securities, net Tax (expense) benefit (57 ) 40 — Income tax expense Net of tax $ 108 $ (75 ) $ —

Derivative Instruments (Tables)

Derivative Instruments (Tables)	12 Months Ended
	Dec. 31, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule of derivative instruments	December 31, 2017: Notional Original Received Paid Fair Value (Dollars in thousands) Cash flow hedge: Interest rate swap on FHLB advance $ 25,000 4.7 years 3-month USD LIBOR 1.62 % $ 62 Interest rate swap on FHLB advance 25,000 5.0 years 3-month USD LIBOR 1.83 % 105 Interest rate swap on FHLB advance 25,000 5.0 years 3-month USD LIBOR 1.48 % 398 Interest rate swap on FHLB advance 25,000 5.0 years 3-month USD LIBOR 1.22 % 793 Interest rate swap on FHLB advance 25,000 7.0 years 3-month USD LIBOR 2.04 % 342 Interest rate swap on FHLB advance 25,000 7.0 years 3-month USD LIBOR 2.04 % 334 $ 150,000 $ 2,034 December 31, 2016: Notional Original Received Paid Fair Value (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 $ 100,000 $ 737
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 FHLB 90-day advance 25,000 August 25, 2017 7.0 years Bank of Montreal FHLB 90-day advance 25,000 August 25, 2017 7.0 years FTN Financial Capital Markets $ 150,000
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 recognized in accumulated other comprehensive income $ 1,297 $ 1,013 Income tax expense on items recognized in accumulated other comprehensive (454 ) (354 ) Other comprehensive income $ 843 $ 659 Amount recognized in interest expense on hedged FHLB advance $ 1,909 $ 1,386

Fair Value of Financial Instr47

Fair Value of Financial Instruments (Tables)	12 Months Ended
	Dec. 31, 2017
Fair Value Disclosures [Abstract]
Schedule of carrying values and fair values of the Company s financial instruments	December 31, 2017 Carrying Fair Level 1 Level 2 Level 3 (In thousands) Financial Assets: Cash and due from banks $ 70,545 $ 70,545 $ 70,545 $ — $ — Federal funds sold 186 186 186 — — Available for sale securities 92,188 92,188 — 92,188 — Held to maturity securities 21,579 22,836 — 1,119 21,717 Loans receivable, net 1,520,879 1,494,599 — — 1,494,599 Accrued interest receivable 5,910 5,910 — 5,910 — FHLB stock 9,183 9,183 — 9,183 — Servicing asset 1,113 1,113 — — 1,113 Derivative asset 2,034 2,034 — 2,034 — Financial Liabilities: Demand deposits $ 172,638 $ 172,638 $ — $ 172,638 $ — NOW and money market 510,746 510,746 — 510,746 — Savings 83,758 83,758 — 83,758 — Time deposits 631,263 629,532 — — 629,532 Accrued interest payable 1,092 1,092 — 1,092 — Advances from the FHLB 199,000 198,932 — — 198,932 Subordinated debentures 25,103 25,457 — — 25,457 Servicing liability 83 83 — — 83 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 — 1,141 15,710 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 966 966 — 966 — 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 Accrued interest payable 837 837 — 837 — Advances from the FHLB 160,000 160,118 — — 160,118 Subordinated debentures 25,051 25,645 — — 25,645 Derivative liability 229 229 — 229 —

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	12 Months Ended
	Dec. 31, 2017
Fair Value Disclosures [Abstract]
Schedule of assets and liabilities measured at fair value on a recurring basis	Fair Value Level 1 Level 2 Level 3 (In thousands) December 31, 2017: Available for sale investment securities: U.S. Government and agency obligations $ — $ 72,774 $ — State agency and municipal obligations — 12,277 — Corporate bonds — 7,137 — Derivative asset, net — 2,034 — December 31, 2016: Available for sale investment securities: U.S. Government and agency obligations $ — $ 62,698 $ — State agency and municipal obligations — 14,763 — Corporate bonds — 10,290 — Derivative asset, net — 737 —
Schedule of financial instruments carried at fair value on a nonrecurring basis	​ ​ ​ Fair Value ​ ​ ​ ​ Level 1 ​ ​ Level 2 ​ ​ Level 3 ​ ​ ​ ​ (In thousands) ​ December 31, 2017: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Impaired loans ​ ​ ​ $ — ​ ​ ​ ​ $ — ​ ​ ​ ​ $ 14,853 ​ ​ Foreclosed real estate ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ December 31, 2016: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Impaired loans ​ ​ ​ $ — ​ ​ ​ ​ $ — ​ ​ ​ ​ $ 4,849 ​ ​ Foreclosed real estate ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ 272 ​ ​
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, 2017: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Impaired loans ​ ​ ​ $ 7,711 ​ ​ ​ Appraisals ​ ​ Discount to appraised value ​ ​ 8.00 – 24.00% ​ ​ ​ ​ ​ ​ 7,142 ​ ​ ​ Discounted cash flows ​ ​ Discount rate ​ ​ 3.25 – 6.75% ​ ​ ​ ​ ​ $ 14,853 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Foreclosed real estate ​ ​ ​ $ — ​ ​ ​ Appraisals ​ ​ Discount to appraised value ​ ​ — ​ December 31, 2016: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Impaired loans ​ ​ ​ $ 2,127 ​ ​ ​ Appraisals ​ ​ Discount to appraised value ​ ​ 8.00 – 28.00% ​ ​ ​ ​ ​ ​ 2,722 ​ ​ ​ Discounted cash flows ​ ​ Discount rate ​ ​ 4.25 – 6.25% ​ ​ ​ ​ ​ $ 4,849 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Foreclosed real estate ​ ​ ​ $ 272 ​ ​ ​ Appraisals ​ ​ Discount to appraised value ​ ​ 20% ​

Regulatory Matters (Tables)

Regulatory Matters (Tables)	12 Months Ended
	Dec. 31, 2017
Banking and Thrift [Abstract]
Schedule of capital amounts and ratios	The capital amounts and ratios for the Bank and the Company at December 31, 2017 were as follows: Actual Capital For Capital To be Well Amount Ratio Amount Ratio Amount Ratio (Dollars in thousands) Bankwell Bank December 31, 2017 Common Equity Tier 1 Capital to Risk-Weighted Assets $ 173,728 10.99 % $ 71,106 4.50 % $ 102,709 6.50 % Total Capital to Risk-Weighted Assets 192,632 12.19 % 126,411 8.00 % 158,014 10.00 % Tier I Capital to Risk-Weighted Assets 173,728 10.99 % 94,808 6.00 % 126,411 8.00 % Tier I Capital to Average Assets 173,728 9.61 % 72,349 4.00 % 90,437 5.00 % Bankwell Financial Group, Inc. December 31, 2017 Common Equity Tier 1 Capital to Risk-Weighted Assets $ 155,977 9.83 % $ 71,369 4.50 % N/A N/A Total Capital to Risk-Weighted Assets 199,984 12.61 % 126,878 8.00 % N/A N/A Tier I Capital to Risk-Weighted Assets 155,977 9.83 % 95,159 6.00 % N/A N/A Tier I Capital to Average Assets 155,977 8.59 % 72,663 4.00 % N/A N/A The capital amounts and ratios for the Bank and 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 10.39 % $ 61,231 4.50 % N/A N/A Total Capital to Risk-Weighted Assets 184,371 13.55 % 108,855 8.00 % N/A N/A Tier I Capital to Risk-Weighted Assets 141,338 10.39 % 81,641 6.00 % N/A N/A Tier I Capital to Average Assets 141,338 9.06 % 62,415 4.00 % N/A N/A

Related Party Transactions (Tab

Related Party Transactions (Tables)	12 Months Ended
	Dec. 31, 2017
Related Party Transactions [Abstract]
Schedule of changes in loans outstanding of related parties	December 31, 2017 2016 (In thousands) Balance, beginning of year $ 22,471 $ 12,891 Additional loans 3,082 9,722 Repayments and changes in status (4,832 ) (142 ) Balance, end of year $ 20,721 $ 22,471

Parent Corporation Only Finan51

Parent Corporation Only Financial Statements (Tables)	12 Months Ended
	Dec. 31, 2017
Parent Corporation Only Financial Statements [Abstract]
Schedule of condensed Statements of Financial Condition	Condensed Statements of Financial Condition December 31, 2017 2016 (Dollars in Thousands) ASSETS Cash and due from banks $ 2,494 $ 5,677 Investment in subsidiary 178,778 162,162 Premises and equipment, net 17 55 Deferred income taxes, net 53 3,063 Other assets 9,068 3,889 Total assets $ 190,410 $ 174,846 LIABILITIES AND SHAREHOLDERS’ EQUITY Subordinated debentures $ 25,103 $ 25,051 Accrued expenses and other liabilities 4,280 3,900 Stockholders’ equity 161,027 145,895 Total liabilities and stockholders’ equity $ 190,410 $ 174,846
Schedule of condensed Statements of Income	Condensed Statements of Income Year Ended December 31, 2017 2016 2015 (Dollars in Thousands) Interest income $ 13 $ 23 $ 38 Other income — — — Total income 13 23 38 Expenses 2,295 3,444 2,714 Loss before equity in undistributed earnings of subsidiaries (2,282 ) (3,421 ) (2,676 ) Equity in undistributed earnings of subsidiaries 16,112 15,771 11,706 Net Income $ 13,830 $ 12,350 $ 9,030
Schedule of condensed Statements of Cash Flows	Condensed Statements of Cash Flows For the Years Ended December 31, 2017 2016 2015 (Dollars in Thousands) Cash flows from operating activities Net income $ 13,830 $ 12,350 $ 9,030 Adjustments to reconcile net income to net cash used by operating activities: Equity in undistributed earnings (16,112 ) (15,771 ) (11,706 ) Increase in other assets (5,179 ) (1,828 ) (418 ) Decrease (Increase) in deferred income taxes, net 3,010 2,385 (2,192 ) Increase in other liabilities 380 1,620 421 Stock-based compensation 917 1,188 1,033 Amortization of debt issuance costs 52 51 — Net cash used by operating activities (3,102 ) (5 ) (3,832 ) Cash flows from investing activities Capital contribution to Bankwell Bank — — (15,000 ) Decrease in premises and equipment, net 37 65 84 Net cash provided by (used by) investing activities 37 65 (14,916 ) 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 & warrants 2,031 1,106 501 Dividends paid on common stock (2,149 ) (1,661 ) (376 ) Dividends paid on preferred stock — — (125 ) Proceeds from issuance of common stock — 200 3,780 Net tax benefit related to stock-based compensation — 280 — Net cash (used by) provided by financing activities (118 ) (75 ) 17,800 Net decrease in cash and cash equivalents (3,183 ) (15 ) (948 ) Cash and cash equivalents: Beginning of year 5,677 5,692 6,640 End of year $ 2,494 $ 5,677 $ 5,692 Supplemental disclosures of cash flows information: Cash paid for: Interest $ — $ — $ — Income taxes — — —

Quarterly Financial Informati52

Quarterly Financial Information of Bankwell Financial Group, Inc. (Unaudited) (Tables)	12 Months Ended
	Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract]
Schedule of quarterly financial information	​ ​ ​ ​ ​ ​ ​ ​ ​ 2017 ​ ​ ​ ​ 4th Quarter ​ ​ 3rd Quarter ​ ​ 2nd Quarter ​ ​ 1st Quarter ​ Total interest income ​ ​ ​ $ 18,729 ​ ​ ​ ​ $ 18,348 ​ ​ ​ ​ $ 17,688 ​ ​ ​ ​ $ 16,436 ​ ​ Total interest expense ​ ​ ​ ​ 4,815 ​ ​ ​ ​ ​ 4,487 ​ ​ ​ ​ ​ 4,047 ​ ​ ​ ​ ​ 3,488 ​ ​ Net interest income ​ ​ ​ ​ 13,914 ​ ​ ​ ​ ​ 13,861 ​ ​ ​ ​ ​ 13,641 ​ ​ ​ ​ ​ 12,948 ​ ​ (Credit) Provision for loan losses ​ ​ ​ ​ (495 ) ​ ​ ​ ​ ​ 398 ​ ​ ​ ​ ​ 895 ​ ​ ​ ​ ​ 543 ​ ​ Non-interest income ​ ​ ​ ​ 1,541 ​ ​ ​ ​ ​ 824 ​ ​ ​ ​ ​ 998 ​ ​ ​ ​ ​ 1,266 ​ ​ Non-interest expense ​ ​ ​ ​ 8,579 ​ ​ ​ ​ ​ 8,129 ​ ​ ​ ​ ​ 7,581 ​ ​ ​ ​ ​ 8,234 ​ ​ Income before income taxes ​ ​ ​ ​ 7,371 ​ ​ ​ ​ ​ 6,158 ​ ​ ​ ​ ​ 6,163 ​ ​ ​ ​ ​ 5,437 ​ ​ Provision from income taxes ​ ​ ​ ​ 5,275 ​ ​ ​ ​ ​ 1,895 ​ ​ ​ ​ ​ 2,394 ​ ​ ​ ​ ​ 1,735 ​ ​ Net income ​ ​ ​ $ 2,096 ​ ​ ​ ​ $ 4,263 ​ ​ ​ ​ $ 3,769 ​ ​ ​ ​ $ 3,702 ​ ​ Net income attributable to common stockholders ​ ​ ​ $ 2,096 ​ ​ ​ ​ $ 4,263 ​ ​ ​ ​ $ 3,769 ​ ​ ​ ​ $ 3,702 ​ ​ Earnings per share: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Basic ​ ​ ​ $ 0.27 ​ ​ ​ ​ $ 0.55 ​ ​ ​ ​ $ 0.49 ​ ​ ​ ​ $ 0.49 ​ ​ Diluted ​ ​ ​ $ 0.27 ​ ​ ​ ​ $ 0.55 ​ ​ ​ ​ $ 0.49 ​ ​ ​ ​ $ 0.48 ​ ​ ​ ​ ​ 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 ​ ​

Nature of Operations and Summ53

Nature of Operations and Summary of Significant Accounting Policies (Detail Textuals) $ in Thousands	1 Months Ended		12 Months Ended
	Oct. 31, 2014USD ($)Branch	Nov. 30, 2013USD ($)Branch	Dec. 31, 2017USD ($)Segment	Dec. 31, 2016USD ($)	Dec. 31, 2015USD ($)	Dec. 31, 2014USD ($)
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
Uncertain tax positions			$ 393	$ 95	$ 0	$ 0
Decrease in retained earnings and increase to accumulated other comprehensive income			$ 301
Statutory federal income tax rate			35.00%
Corporate income tax rate effective in 2018			21.00%
Wilton Bank ("Wilton")
Business Acquisition [Line Items]
Number of branch acquired | Branch		1
Amount of loans acquired		$ 25,100
Amount of deposits acquired		$ 64,200
Quinnipiac Bank and Trust Company
Business Acquisition [Line Items]
Number of branch acquired | Branch	2
Amount of loans acquired	$ 97,800
Amount of deposits acquired	$ 100,600

Shareholders' Equity (Detail Te

Shareholders' Equity (Detail Textuals) $ / shares in Units, $ in Millions	May 15, 2014USD ($)$ / sharesshares
Stockholders Equity Note [Line Items]
Number of common shares authorized to issue in initial public offering | shares	2,702,703
Initial Public Offering ("IPO")
Stockholders Equity Note [Line Items]
Number of common shares authorized to issue in initial public offering | shares	2,702,703
Price per share of shares issued (in dollars per share) | $ / shares	$ 18
Net proceeds from the IPO	$ 44.7
Underwriting discount	2.5
Amount of expenses incurred in public offering	$ 1.3

Shareholders' Equity (Detail 55

Shareholders' Equity (Detail textuals 1) - Quinnipiac Bank and Trust Company - $ / shares	12 Months Ended
	Dec. 31, 2017	Oct. 01, 2014
Stockholders Equity Note [Line Items]
Number of warrants issued		68,600
Number of common stock shares purchased under each warrant		0.56
Exercise price of warrant		$ 17.86
Number of warrant exercised	46,200

Reserve Requirements On Cash 56

Reserve Requirements On Cash and Due From Banks (Detail Textuals) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Reserve Requirements On Cash And Due From Banks [Abstract]
Minimum reserve requires to maintain in Federal Reserve Bank	$ 11.1	$ 11.8
Minimum reserve require to maintain in Atlantic Community Bankers Bank	$ 7.5	$ 10.1

Goodwill and other intangible57

Goodwill and other intangible assets - Summary of goodwill (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Goodwill [Roll Forward]
Balance, beginning of the period	$ 2,589	$ 2,589
Impairment	0	0
Balance, end of the period	$ 2,589	$ 2,589

Goodwill and other intangible58

Goodwill and other intangible assets - Information regarding the carrying amounts and accumulated amortization of amortized intangible assets (Details 1) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]
Net Intangible Asset	$ 382	$ 501
Core deposit intangible
Finite-Lived Intangible Assets [Line Items]
Gross Intangible Asset	1,029	1,029
Accumulated Amortization	647	528
Net Intangible Asset	$ 382	$ 501

Goodwill and other intangible59

Goodwill and other intangible assets (Detail Textuals)	12 Months Ended
	Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]
Period of remaining net intangible asset	5 years

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, 2017	Dec. 31, 2016
Available for sale securities:
Amortized Cost	$ 92,079	$ 87,119
Gross Unrealized Gains	396	809
Gross Unrealized Losses	(287)	(177)
Fair value	92,188	87,751
Held to maturity securities:
Amortized Cost	21,579	16,859
Gross Unrealized Gains	1,262	15
Gross Unrealized Losses	(5)	(23)
Fair value	22,836	16,851
U.S. Government and agency obligations
Available for sale securities:
Due from one through five years, Amortized Cost	13,000	62,357
Due from one through five years, Gross Unrealized Gains	0	295
Due from one through five years, Gross Unrealized Losses	(82)	(49)
Due from one through five years, Fair Value	12,918	62,603
Due from five through ten years, Amortized Cost	100
Due from five through ten years, Gross Unrealized Gains	0
Due from five through ten years, Gross Unrealized Losses	(4)
Due from five through ten years, Fair Value	96
Due after ten years, Amortized Cost	59,924	100
Due after ten years, Gross Unrealized Gains	10	0
Due after ten years, Gross Unrealized Losses	(174)	(5)
Due after ten years, Fair Value	59,760	95
Amortized Cost	73,024	62,457
Gross Unrealized Gains	10	295
Gross Unrealized Losses	(260)	(54)
Fair value	72,774	62,698
State agency and municipal obligations
Available for sale securities:
Due from one through five years, Amortized Cost	2,873	827
Due from one through five years, Gross Unrealized Gains	84	24
Due from one through five years, Gross Unrealized Losses	0	(3)
Due from one through five years, Fair Value	2,957	848
Due from five through ten years, Amortized Cost	7,386	8,045
Due from five through ten years, Gross Unrealized Gains	228	189
Due from five through ten years, Gross Unrealized Losses	0	(1)
Due from five through ten years, Fair Value	7,614	8,233
Due after ten years, Amortized Cost	1,700	5,623
Due after ten years, Gross Unrealized Gains	33	178
Due after ten years, Gross Unrealized Losses	(27)	(119)
Due after ten years, Fair Value	1,706	5,682
Amortized Cost	11,959	14,495
Gross Unrealized Gains	345	391
Gross Unrealized Losses	(27)	(123)
Fair value	12,277	14,763
Held to maturity securities:
Due in less than one year, Amortized cost	198
Due in less than one year, Gross Unrealized Gains	5
Due in less than one year. Gross Unrealized Losses	0
Due in less than one year, Fair Value	203
Due from one through five years, Amortized Cost	3,880	2,135
Due from one through five years, Gross Unrealized Gains	20	0
Due from one through five years, Gross Unrealized Losses	0	0
Due from one through five years, Fair Value	3,900	2,135
Due after ten years, Amortized Cost	16,387	13,575
Due after ten years, Gross Unrealized Gains	1,227	0
Due after ten years, Gross Unrealized Losses	0	0
Due after ten years, Fair Value	17,614	13,575
Amortized Cost	20,465	15,710
Gross Unrealized Gains	1,252	0
Gross Unrealized Losses	0	0
Fair value	21,717	15,710
Corporate bonds
Available for sale securities:
Due in less than one year, Amortized Cost		2,022
Due in less than one year, Gross Unrealized Gains		56
Due in less than one year, Gross Unrealized Losses		0
Due in less than one year, Fair Value		2,078
Due from one through five years, Amortized Cost	7,096	8,145
Due from one through five years, Gross Unrealized Gains	41	67
Due from one through five years, Gross Unrealized Losses	0	0
Due from one through five years, Fair Value	7,137	8,212
Amortized Cost	7,096	10,167
Gross Unrealized Gains	41	123
Gross Unrealized Losses	0	0
Fair value	7,137	10,290
Held to maturity securities:
Due from one through five years, Amortized Cost	1,000	1,000
Due from one through five years, Gross Unrealized Gains	0	0
Due from one through five years, Gross Unrealized Losses	(5)	(23)
Due from one through five years, Fair Value	995	977
Government-sponsored mortgage backed securities
Held to maturity securities:
No contractual maturity, Amortized Cost	114	149
No contractual maturity, Gross Unrealized Gains	10	15
No contractual maturity, Gross Unrealized Losses	0	0
No contractual maturity, Fair Value	$ 124	$ 164

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, 2017	Dec. 31, 2016
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items]
Less than 12 months - Fair Value	$ 70,511	$ 6,779
Less than 12 months - Unrealized Loss	$ (225)	$ (200)
Less Than 12 Months - Percent Decline from Amortized Cost	0.32%	2.86%
12 Months or More - Fair Value	$ 3,715	$ 0
12 Months or More - Unrealized Loss	$ (67)	$ 0
12 Months or More Percent Decline from Amortized Cost	1.77%	0.00%
Fair value - Total	$ 74,226	$ 6,779
Unrealized Loss - Total	$ (292)	$ (200)
Percent Decline from Amortized Cost - Total	0.39%	2.86%
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	$ 70,419	$ 3,045
Less than 12 months - Unrealized Loss	$ (225)	$ (54)
Less Than 12 Months - Percent Decline from Amortized Cost	0.32%	1.74%
12 Months or More - Fair Value	$ 2,064	$ 0
12 Months or More - Unrealized Loss	$ (35)	$ 0
12 Months or More Percent Decline from Amortized Cost	1.67%	0.00%
Fair value - Total	$ 72,483	$ 3,045
Unrealized Loss - Total	$ (260)	$ (54)
Percent Decline from Amortized Cost - Total	0.36%	1.74%
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	$ 92	$ 2,756
Less than 12 months - Unrealized Loss	$ 0	$ (123)
Less Than 12 Months - Percent Decline from Amortized Cost	0.16%	4.29%
12 Months or More - Fair Value	$ 656	$ 0
12 Months or More - Unrealized Loss	$ (27)	$ 0
12 Months or More Percent Decline from Amortized Cost	3.95%	0.00%
Fair value - Total	$ 748	$ 2,756
Unrealized Loss - Total	$ (27)	$ (123)
Percent Decline from Amortized Cost - Total	3.50%	4.29%
Corporate bonds
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items]
Less than 12 months - Fair Value	$ 0	$ 978
Less than 12 months - Unrealized Loss	$ 0	$ (23)
Less Than 12 Months - Percent Decline from Amortized Cost	0.00%	2.25%
12 Months or More - Fair Value	$ 995	$ 0
12 Months or More - Unrealized Loss	$ (5)	$ 0
12 Months or More Percent Decline from Amortized Cost	0.50%	0.00%
Fair value - Total	$ 995	$ 978
Unrealized Loss - Total	$ (5)	$ (23)
Percent Decline from Amortized Cost - Total	0.50%	2.25%

Investment Securities (Detail T

Investment Securities (Detail Textuals)	12 Months Ended
	Dec. 31, 2017USD ($)Security	Dec. 31, 2016USD ($)Security
Financial Instruments Owned and Pledged as Collateral [Line Items]
Gross gains from the sales of investment securities	$ 165,000	$ 129,400
Proceeds from sale of investment securities	$ 49,200,000	54,700,000
Gross losses from the sales of investment securities		$ 244,600
Number of securities | Security	15	11
Public deposits
Financial Instruments Owned and Pledged as Collateral [Line Items]
Securities pledged as collateral		$ 60,000,000

Loans Receivable and Allowanc63

Loans Receivable and Allowance for Loan Losses - Summary of loan portfolio (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Loans and Leases Receivable Disclosure [Line Items]
Total loans	$ 1,543,016	$ 1,365,939
Allowance for loan losses	(18,904)	(17,982)	$ (14,169)	$ (10,860)
Deferred loan origination fees, net	(3,242)	(4,071)
Unamortized loan premiums	8	9
Loans receivable, net	1,520,879	1,343,895
Real estate loans
Loans and Leases Receivable Disclosure [Line Items]
Total loans	1,282,402	1,148,492
Real estate loans | Residential
Loans and Leases Receivable Disclosure [Line Items]
Total loans	193,524	195,729
Allowance for loan losses	(1,721)	(1,802)	(1,618)	(1,636)
Real estate loans | Commercial
Loans and Leases Receivable Disclosure [Line Items]
Total loans	987,242	845,322
Allowance for loan losses	(12,777)	(9,415)	(7,705)	(5,480)
Real estate loans | Construction
Loans and Leases Receivable Disclosure [Line Items]
Total loans	101,636	107,441
Allowance for loan losses	(907)	(2,105)	(1,504)	(1,102)
Commercial business
Loans and Leases Receivable Disclosure [Line Items]
Total loans	259,995	215,914
Allowance for loan losses	(3,498)	(4,283)	(3,334)	(2,638)
Consumer
Loans and Leases Receivable Disclosure [Line Items]
Total loans	619	1,533
Allowance for loan losses	(1)	(377)	(8)	(4)
Originated
Loans and Leases Receivable Disclosure [Line Items]
Total loans	1,482,931	1,295,711
Allowance for loan losses	(18,848)	(17,883)	(14,128)	(10,860)
Deferred loan origination fees, net	(3,242)	(4,071)
Unamortized loan premiums	8	9
Loans receivable, net	1,460,849	1,273,766
Originated | Real estate loans
Loans and Leases Receivable Disclosure [Line Items]
Total loans	1,233,020	1,096,583
Originated | Real estate loans | Residential
Loans and Leases Receivable Disclosure [Line Items]
Total loans	186,107	187,098
Allowance for loan losses	(1,721)	(1,802)	(1,618)	(1,636)
Originated | Real estate loans | Commercial
Loans and Leases Receivable Disclosure [Line Items]
Total loans	945,277	802,156
Allowance for loan losses	(12,741)	(9,386)	(7,693)	(5,480)
Originated | Real estate loans | Construction
Loans and Leases Receivable Disclosure [Line Items]
Total loans	101,636	107,329
Allowance for loan losses	(907)	(2,105)	(1,504)	(1,102)
Originated | Commercial business
Loans and Leases Receivable Disclosure [Line Items]
Total loans	249,719	198,456
Allowance for loan losses	(3,478)	(4,240)	(3,310)	(2,638)
Originated | Consumer
Loans and Leases Receivable Disclosure [Line Items]
Total loans	192	672
Allowance for loan losses	(1)	(350)	(3)	(4)
Acquired
Loans and Leases Receivable Disclosure [Line Items]
Total loans	60,085	70,228
Allowance for loan losses	(56)	(99)	(41)	0
Deferred loan origination fees, net	0	0
Unamortized loan premiums	0	0
Loans receivable, net	60,029	70,129
Acquired | Real estate loans
Loans and Leases Receivable Disclosure [Line Items]
Total loans	49,382	51,909
Acquired | Real estate loans | Residential
Loans and Leases Receivable Disclosure [Line Items]
Total loans	7,417	8,631
Allowance for loan losses	0	0	0	0
Acquired | Real estate loans | Commercial
Loans and Leases Receivable Disclosure [Line Items]
Total loans	41,965	43,166
Allowance for loan losses	(36)	(29)	(12)	0
Acquired | Real estate loans | Construction
Loans and Leases Receivable Disclosure [Line Items]
Total loans	0	112
Allowance for loan losses	0	0	0	0
Acquired | Commercial business
Loans and Leases Receivable Disclosure [Line Items]
Total loans	10,276	17,458
Allowance for loan losses	(20)	(43)	(24)	0
Acquired | Consumer
Loans and Leases Receivable Disclosure [Line Items]
Total loans	427	861
Allowance for loan losses	$ 0	$ (27)	$ (5)	$ 0

Loans Receivable and Allowanc64

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, 2017	Dec. 31, 2016
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]
Balance at beginning of period		$ 666	$ 871
Accretion		(113)	(154)
Other	[1]	0	(51)
Balance at end of period		$ 553	$ 666
[1]	Represents changes in cash flows expected to be collected due to loan sales or payoffs.

Loans Receivable and Allowanc65

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, 2017	Dec. 31, 2016	Dec. 31, 2015
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	$ 17,982	$ 14,169	$ 10,860
Charge-offs	(572)	(111)	(30)
Recoveries	153	10	109
Provisions	1,341	3,914	3,230
Ending balance	18,904	17,982	14,169
Commercial business
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	4,283	3,334	2,638
Charge-offs	(521)	(69)	(15)
Recoveries	4	0	100
Provisions	(268)	1,018	611
Ending balance	3,498	4,283	3,334
Consumer
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	377	8	4
Charge-offs	(51)	(35)	(15)
Recoveries	3	10	9
Provisions	(328)	394	10
Ending balance	1	377	8
Residential | Real estate loans
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	1,802	1,618	1,636
Charge-offs	0	0	0
Recoveries	146	0	0
Provisions	(227)	184	(18)
Ending balance	1,721	1,802	1,618
Commercial | Real estate loans
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	9,415	7,705	5,480
Charge-offs	0	0	0
Recoveries	0	0	0
Provisions	3,362	1,710	2,225
Ending balance	12,777	9,415	7,705
Construction | Real estate loans
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	2,105	1,504	1,102
Charge-offs	0	(7)	0
Recoveries	0	0	0
Provisions	(1,198)	608	402
Ending balance	907	2,105	1,504
Originated
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	17,883	14,128	10,860
Charge-offs	(510)	(69)	(6)
Recoveries	153	8	7
Provisions	1,322	3,816	3,267
Ending balance	18,848	17,883	14,128
Originated | Commercial business
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	4,240	3,310	2,638
Charge-offs	(478)	(59)	0
Recoveries	4	0	0
Provisions	(288)	989	672
Ending balance	3,478	4,240	3,310
Originated | Consumer
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	350	3	4
Charge-offs	(32)	(10)	(6)
Recoveries	3	8	7
Provisions	(320)	349	(2)
Ending balance	1	350	3
Originated | Residential | Real estate loans
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	1,802	1,618	1,636
Charge-offs	0	0	0
Recoveries	146	0	0
Provisions	(227)	184	(18)
Ending balance	1,721	1,802	1,618
Originated | Commercial | Real estate loans
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	9,386	7,693	5,480
Charge-offs	0	0	0
Recoveries	0	0	0
Provisions	3,355	1,693	2,213
Ending balance	12,741	9,386	7,693
Originated | Construction | Real estate loans
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	2,105	1,504	1,102
Charge-offs	0	0	0
Recoveries	0	0	0
Provisions	(1,198)	601	402
Ending balance	907	2,105	1,504
Acquired
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	99	41	0
Charge-offs	(62)	(42)	(24)
Recoveries	0	2	102
Provisions	19	98	(37)
Ending balance	56	99	41
Acquired | Commercial business
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	43	24	0
Charge-offs	(43)	(10)	(15)
Recoveries	0	0	100
Provisions	20	29	(61)
Ending balance	20	43	24
Acquired | Consumer
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	27	5	0
Charge-offs	(19)	(25)	(9)
Recoveries	0	2	2
Provisions	(8)	45	12
Ending balance	0	27	5
Acquired | Residential | Real estate loans
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	0	0	0
Charge-offs	0	0	0
Recoveries	0	0	0
Provisions	0	0	0
Ending balance	0	0	0
Acquired | Commercial | Real estate loans
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	29	12	0
Charge-offs	0	0	0
Recoveries	0	0	0
Provisions	7	17	12
Ending balance	36	29	12
Acquired | Construction | Real estate loans
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	0	0	0
Charge-offs	0	(7)	0
Recoveries	0	0	0
Provisions	0	7	0
Ending balance	$ 0	$ 0	$ 0

Loans Receivable and Allowanc66

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, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Loans individually evaluated for impairment:
Loans individually evaluated for impairment, Portfolio	$ 14,853	$ 4,849
Loans individually evaluated for impairment, Allowance	955	418
Loans collectively evaluated for impairment:
Loans collectively evaluated for impairment, Portfolio	1,528,163	1,361,090
Loans collectively evaluated for impairment, Allowance	17,949	17,564
Portfolio, Total	1,543,016	1,365,939
Allowance, Total	18,904	17,982	$ 14,169	$ 10,860
Real estate loans
Loans collectively evaluated for impairment:
Portfolio, Total	1,282,402	1,148,492
Commercial business
Loans individually evaluated for impairment:
Loans individually evaluated for impairment, Portfolio	2,660	1,882
Loans individually evaluated for impairment, Allowance	71	42
Loans collectively evaluated for impairment:
Loans collectively evaluated for impairment, Portfolio	257,335	214,032
Loans collectively evaluated for impairment, Allowance	3,427	4,241
Portfolio, Total	259,995	215,914
Allowance, Total	3,498	4,283	3,334	2,638
Consumer
Loans individually evaluated for impairment:
Loans individually evaluated for impairment, Portfolio		368
Loans individually evaluated for impairment, Allowance		368
Loans collectively evaluated for impairment:
Loans collectively evaluated for impairment, Portfolio	619	1,165
Loans collectively evaluated for impairment, Allowance	1	9
Portfolio, Total	619	1,533
Allowance, Total	1	377	8	4
Residential | Real estate loans
Loans individually evaluated for impairment:
Loans individually evaluated for impairment, Portfolio	4,607	1,681
Loans individually evaluated for impairment, Allowance	8	0
Loans collectively evaluated for impairment:
Loans collectively evaluated for impairment, Portfolio	188,917	194,048
Loans collectively evaluated for impairment, Allowance	1,713	1,802
Portfolio, Total	193,524	195,729
Allowance, Total	1,721	1,802	1,618	1,636
Commercial | Real estate loans
Loans individually evaluated for impairment:
Loans individually evaluated for impairment, Portfolio	7,586	918
Loans individually evaluated for impairment, Allowance	876	8
Loans collectively evaluated for impairment:
Loans collectively evaluated for impairment, Portfolio	979,656	844,404
Loans collectively evaluated for impairment, Allowance	11,901	9,407
Portfolio, Total	987,242	845,322
Allowance, Total	12,777	9,415	7,705	5,480
Construction | Real estate loans
Loans collectively evaluated for impairment:
Loans collectively evaluated for impairment, Portfolio	101,636	107,441
Loans collectively evaluated for impairment, Allowance	907	2,105
Portfolio, Total	101,636	107,441
Allowance, Total	907	2,105	1,504	1,102
Originated
Loans individually evaluated for impairment:
Loans individually evaluated for impairment, Portfolio	12,710	3,263
Loans individually evaluated for impairment, Allowance	901	347
Loans collectively evaluated for impairment:
Loans collectively evaluated for impairment, Portfolio	1,470,221	1,292,448
Loans collectively evaluated for impairment, Allowance	17,947	17,536
Portfolio, Total	1,482,931	1,295,711
Allowance, Total	18,848	17,883	14,128	10,860
Originated | Real estate loans
Loans collectively evaluated for impairment:
Portfolio, Total	1,233,020	1,096,583
Originated | Commercial business
Loans individually evaluated for impairment:
Loans individually evaluated for impairment, Portfolio	2,126	920
Loans individually evaluated for impairment, Allowance	51	5
Loans collectively evaluated for impairment:
Loans collectively evaluated for impairment, Portfolio	247,593	197,536
Loans collectively evaluated for impairment, Allowance	3,427	4,235
Portfolio, Total	249,719	198,456
Allowance, Total	3,478	4,240	3,310	2,638
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	192	331
Loans collectively evaluated for impairment, Allowance	1	9
Portfolio, Total	192	672
Allowance, Total	1	350	3	4
Originated | Residential | Real estate loans
Loans individually evaluated for impairment:
Loans individually evaluated for impairment, Portfolio	4,168	1,228
Loans individually evaluated for impairment, Allowance	8	0
Loans collectively evaluated for impairment:
Loans collectively evaluated for impairment, Portfolio	181,939	185,870
Loans collectively evaluated for impairment, Allowance	1,713	1,802
Portfolio, Total	186,107	187,098
Allowance, Total	1,721	1,802	1,618	1,636
Originated | Commercial | Real estate loans
Loans individually evaluated for impairment:
Loans individually evaluated for impairment, Portfolio	6,416	774
Loans individually evaluated for impairment, Allowance	842	1
Loans collectively evaluated for impairment:
Loans collectively evaluated for impairment, Portfolio	938,861	801,382
Loans collectively evaluated for impairment, Allowance	11,899	9,385
Portfolio, Total	945,277	802,156
Allowance, Total	12,741	9,386	7,693	5,480
Originated | Construction | Real estate loans
Loans collectively evaluated for impairment:
Loans collectively evaluated for impairment, Portfolio	101,636	107,329
Loans collectively evaluated for impairment, Allowance	907	2,105
Portfolio, Total	101,636	107,329
Allowance, Total	907	2,105	1,504	1,102
Acquired
Loans individually evaluated for impairment:
Loans individually evaluated for impairment, Portfolio	2,143	1,586
Loans individually evaluated for impairment, Allowance	54	71
Loans collectively evaluated for impairment:
Loans collectively evaluated for impairment, Portfolio	57,942	68,642
Loans collectively evaluated for impairment, Allowance	2	28
Portfolio, Total	60,085	70,228
Allowance, Total	56	99	41	0
Acquired | Real estate loans
Loans collectively evaluated for impairment:
Portfolio, Total	49,382	51,909
Acquired | Commercial business
Loans individually evaluated for impairment:
Loans individually evaluated for impairment, Portfolio	534	962
Loans individually evaluated for impairment, Allowance	20	37
Loans collectively evaluated for impairment:
Loans collectively evaluated for impairment, Portfolio	9,742	16,496
Loans collectively evaluated for impairment, Allowance	0	6
Portfolio, Total	10,276	17,458
Allowance, Total	20	43	24	0
Acquired | Consumer
Loans individually evaluated for impairment:
Loans individually evaluated for impairment, Portfolio		27
Loans individually evaluated for impairment, Allowance		27
Loans collectively evaluated for impairment:
Loans collectively evaluated for impairment, Portfolio	427	834
Loans collectively evaluated for impairment, Allowance	0	0
Portfolio, Total	427	861
Allowance, Total	0	27	5	0
Acquired | Residential | Real estate loans
Loans individually evaluated for impairment:
Loans individually evaluated for impairment, Portfolio	439	453
Loans individually evaluated for impairment, Allowance	0	0
Loans collectively evaluated for impairment:
Loans collectively evaluated for impairment, Portfolio	6,978	8,178
Loans collectively evaluated for impairment, Allowance	0	0
Portfolio, Total	7,417	8,631
Allowance, Total	0	0	0	0
Acquired | Commercial | Real estate loans
Loans individually evaluated for impairment:
Loans individually evaluated for impairment, Portfolio	1,170	144
Loans individually evaluated for impairment, Allowance	34	7
Loans collectively evaluated for impairment:
Loans collectively evaluated for impairment, Portfolio	40,795	43,022
Loans collectively evaluated for impairment, Allowance	2	22
Portfolio, Total	41,965	43,166
Allowance, Total	36	29	12	0
Acquired | Construction | Real estate loans
Loans collectively evaluated for impairment:
Loans collectively evaluated for impairment, Portfolio	0	112
Loans collectively evaluated for impairment, Allowance	0	0
Portfolio, Total	0	112
Allowance, Total	$ 0	$ 0	$ 0	$ 0

Loans Receivable and Allowanc67

Loans Receivable and Allowance for Loan Losses - Summary of loan portfolio quality indicators by portfolio segment (Details 4) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Financing Receivable, Recorded Investment [Line Items]
Total loans	$ 1,543,016	$ 1,365,939
Real estate loans
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,282,402	1,148,492
Real estate loans | Residential
Financing Receivable, Recorded Investment [Line Items]
Total loans	193,524	195,729
Real estate loans | Commercial
Financing Receivable, Recorded Investment [Line Items]
Total loans	987,242	845,322
Real estate loans | Construction
Financing Receivable, Recorded Investment [Line Items]
Total loans	101,636	107,441
Commercial business
Financing Receivable, Recorded Investment [Line Items]
Total loans	259,995	215,914
Consumer
Financing Receivable, Recorded Investment [Line Items]
Total loans	619	1,533
Originated
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,482,931	1,295,711
Originated | Real estate loans
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,233,020	1,096,583
Originated | Real estate loans | Residential
Financing Receivable, Recorded Investment [Line Items]
Total loans	186,107	187,098
Originated | Real estate loans | Commercial
Financing Receivable, Recorded Investment [Line Items]
Total loans	945,277	802,156
Originated | Real estate loans | Construction
Financing Receivable, Recorded Investment [Line Items]
Total loans	101,636	107,329
Originated | Commercial business
Financing Receivable, Recorded Investment [Line Items]
Total loans	249,719	198,456
Originated | Consumer
Financing Receivable, Recorded Investment [Line Items]
Total loans	192	672
Acquired
Financing Receivable, Recorded Investment [Line Items]
Total loans	60,085	70,228
Acquired | Real estate loans
Financing Receivable, Recorded Investment [Line Items]
Total loans	49,382	51,909
Acquired | Real estate loans | Residential
Financing Receivable, Recorded Investment [Line Items]
Total loans	7,417	8,631
Acquired | Real estate loans | Commercial
Financing Receivable, Recorded Investment [Line Items]
Total loans	41,965	43,166
Acquired | Real estate loans | Construction
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	112
Acquired | Commercial business
Financing Receivable, Recorded Investment [Line Items]
Total loans	10,276	17,458
Acquired | Consumer
Financing Receivable, Recorded Investment [Line Items]
Total loans	427	861
Commercial credit quality indicators
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,348,873	1,168,677
Commercial credit quality indicators | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,315,108	1,159,544
Commercial credit quality indicators | Special mention
Financing Receivable, Recorded Investment [Line Items]
Total loans	13,390	6,390
Commercial credit quality indicators | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans	20,266	2,743
Commercial credit quality indicators | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total loans	109	0
Commercial credit quality indicators | Loss
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
Commercial credit quality indicators | Real estate loans | Commercial
Financing Receivable, Recorded Investment [Line Items]
Total loans	987,242	845,322
Commercial credit quality indicators | Real estate loans | Commercial | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans	960,902	838,831
Commercial credit quality indicators | Real estate loans | Commercial | Special mention
Financing Receivable, Recorded Investment [Line Items]
Total loans	9,371	6,189
Commercial credit quality indicators | Real estate loans | Commercial | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans	16,969	302
Commercial credit quality indicators | Real estate loans | Commercial | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
Commercial credit quality indicators | Real estate loans | Commercial | Loss
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
Commercial credit quality indicators | Real estate loans | Construction
Financing Receivable, Recorded Investment [Line Items]
Total loans	101,636	107,441
Commercial credit quality indicators | Real estate loans | Construction | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans	101,636	107,441
Commercial credit quality indicators | Real estate loans | Construction | Special mention
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
Commercial credit quality indicators | Real estate loans | Construction | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
Commercial credit quality indicators | Real estate loans | Construction | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
Commercial credit quality indicators | Real estate loans | Construction | Loss
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
Commercial credit quality indicators | Commercial business
Financing Receivable, Recorded Investment [Line Items]
Total loans	259,995	215,914
Commercial credit quality indicators | Commercial business | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans	252,570	213,272
Commercial credit quality indicators | Commercial business | Special mention
Financing Receivable, Recorded Investment [Line Items]
Total loans	4,019	201
Commercial credit quality indicators | Commercial business | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans	3,297	2,441
Commercial credit quality indicators | Commercial business | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total loans	109	0
Commercial credit quality indicators | Commercial business | Loss
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
Commercial credit quality indicators | Originated
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,296,632	1,107,941
Commercial credit quality indicators | Originated | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,264,680	1,101,014
Commercial credit quality indicators | Originated | Special mention
Financing Receivable, Recorded Investment [Line Items]
Total loans	13,281	4,720
Commercial credit quality indicators | Originated | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans	18,671	2,207
Commercial credit quality indicators | Originated | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
Commercial credit quality indicators | Originated | Loss
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
Commercial credit quality indicators | Originated | Real estate loans | Commercial
Financing Receivable, Recorded Investment [Line Items]
Total loans	945,277	802,156
Commercial credit quality indicators | Originated | Real estate loans | Commercial | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans	920,216	797,249
Commercial credit quality indicators | Originated | Real estate loans | Commercial | Special mention
Financing Receivable, Recorded Investment [Line Items]
Total loans	9,262	4,605
Commercial credit quality indicators | Originated | Real estate loans | Commercial | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans	15,799	302
Commercial credit quality indicators | Originated | Real estate loans | Commercial | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
Commercial credit quality indicators | Originated | Real estate loans | Commercial | Loss
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
Commercial credit quality indicators | Originated | Real estate loans | Construction
Financing Receivable, Recorded Investment [Line Items]
Total loans	101,636	107,329
Commercial credit quality indicators | Originated | Real estate loans | Construction | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans	101,636	107,329
Commercial credit quality indicators | Originated | Real estate loans | Construction | Special mention
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
Commercial credit quality indicators | Originated | Real estate loans | Construction | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
Commercial credit quality indicators | Originated | Real estate loans | Construction | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
Commercial credit quality indicators | Originated | Real estate loans | Construction | Loss
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
Commercial credit quality indicators | Originated | Commercial business
Financing Receivable, Recorded Investment [Line Items]
Total loans	249,719	198,456
Commercial credit quality indicators | Originated | Commercial business | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans	242,828	196,436
Commercial credit quality indicators | Originated | Commercial business | Special mention
Financing Receivable, Recorded Investment [Line Items]
Total loans	4,019	115
Commercial credit quality indicators | Originated | Commercial business | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans	2,872	1,905
Commercial credit quality indicators | Originated | Commercial business | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
Commercial credit quality indicators | Originated | Commercial business | Loss
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
Commercial credit quality indicators | Acquired
Financing Receivable, Recorded Investment [Line Items]
Total loans	52,241	60,736
Commercial credit quality indicators | Acquired | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans	50,428	58,530
Commercial credit quality indicators | Acquired | Special mention
Financing Receivable, Recorded Investment [Line Items]
Total loans	109	1,670
Commercial credit quality indicators | Acquired | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,595	536
Commercial credit quality indicators | Acquired | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total loans	109	0
Commercial credit quality indicators | Acquired | Loss
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
Commercial credit quality indicators | Acquired | Real estate loans | Commercial
Financing Receivable, Recorded Investment [Line Items]
Total loans	41,965	43,166
Commercial credit quality indicators | Acquired | Real estate loans | Commercial | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans	40,686	41,582
Commercial credit quality indicators | Acquired | Real estate loans | Commercial | Special mention
Financing Receivable, Recorded Investment [Line Items]
Total loans	109	1,584
Commercial credit quality indicators | Acquired | Real estate loans | Commercial | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,170	0
Commercial credit quality indicators | Acquired | Real estate loans | Commercial | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
Commercial credit quality indicators | Acquired | Real estate loans | Commercial | Loss
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
Commercial credit quality indicators | Acquired | Real estate loans | Construction
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	112
Commercial credit quality indicators | Acquired | Real estate loans | Construction | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	112
Commercial credit quality indicators | Acquired | Real estate loans | Construction | Special mention
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
Commercial credit quality indicators | Acquired | Real estate loans | Construction | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
Commercial credit quality indicators | Acquired | Real estate loans | Construction | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
Commercial credit quality indicators | Acquired | Real estate loans | Construction | Loss
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
Commercial credit quality indicators | Acquired | Commercial business
Financing Receivable, Recorded Investment [Line Items]
Total loans	10,276	17,458
Commercial credit quality indicators | Acquired | Commercial business | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans	9,742	16,836
Commercial credit quality indicators | Acquired | Commercial business | Special mention
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	86
Commercial credit quality indicators | Acquired | Commercial business | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans	425	536
Commercial credit quality indicators | Acquired | Commercial business | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total loans	109	0
Commercial credit quality indicators | Acquired | Commercial business | Loss
Financing Receivable, Recorded Investment [Line Items]
Total loans	$ 0	$ 0

Loans Receivable and Allowanc68

Loans Receivable and Allowance for Loan Losses - Summary of loan portfolio quality indicators by portfolio segment (Details 5) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Financing Receivable, Recorded Investment [Line Items]
Total loans	$ 1,543,016	$ 1,365,939
Real estate loans
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,282,402	1,148,492
Real estate loans | Residential
Financing Receivable, Recorded Investment [Line Items]
Total loans	193,524	195,729
Real estate loans | Commercial
Financing Receivable, Recorded Investment [Line Items]
Total loans	987,242	845,322
Real estate loans | Construction
Financing Receivable, Recorded Investment [Line Items]
Total loans	101,636	107,441
Commercial business
Financing Receivable, Recorded Investment [Line Items]
Total loans	259,995	215,914
Consumer
Financing Receivable, Recorded Investment [Line Items]
Total loans	619	1,533
Originated
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,482,931	1,295,711
Originated | Real estate loans
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,233,020	1,096,583
Originated | Real estate loans | Residential
Financing Receivable, Recorded Investment [Line Items]
Total loans	186,107	187,098
Originated | Real estate loans | Commercial
Financing Receivable, Recorded Investment [Line Items]
Total loans	945,277	802,156
Originated | Real estate loans | Construction
Financing Receivable, Recorded Investment [Line Items]
Total loans	101,636	107,329
Originated | Commercial business
Financing Receivable, Recorded Investment [Line Items]
Total loans	249,719	198,456
Originated | Consumer
Financing Receivable, Recorded Investment [Line Items]
Total loans	192	672
Acquired
Financing Receivable, Recorded Investment [Line Items]
Total loans	60,085	70,228
Acquired | Real estate loans
Financing Receivable, Recorded Investment [Line Items]
Total loans	49,382	51,909
Acquired | Real estate loans | Residential
Financing Receivable, Recorded Investment [Line Items]
Total loans	7,417	8,631
Acquired | Real estate loans | Commercial
Financing Receivable, Recorded Investment [Line Items]
Total loans	41,965	43,166
Acquired | Real estate loans | Construction
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	112
Acquired | Commercial business
Financing Receivable, Recorded Investment [Line Items]
Total loans	10,276	17,458
Acquired | Consumer
Financing Receivable, Recorded Investment [Line Items]
Total loans	427	861
Residential and Consumer credit quality indicators
Financing Receivable, Recorded Investment [Line Items]
Total loans	194,143	197,262
Residential and Consumer credit quality indicators | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans	189,536	194,064
Residential and Consumer credit quality indicators | Special mention
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	265
Residential and Consumer credit quality indicators | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans	4,607	2,568
Residential and Consumer credit quality indicators | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
Residential and Consumer credit quality indicators | Loss
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	365
Residential and Consumer credit quality indicators | Real estate loans | Residential
Financing Receivable, Recorded Investment [Line Items]
Total loans	193,524	195,729
Residential and Consumer credit quality indicators | Real estate loans | Residential | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans	188,917	192,898
Residential and Consumer credit quality indicators | Real estate loans | Residential | Special mention
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	265
Residential and Consumer credit quality indicators | Real estate loans | Residential | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans	4,607	2,566
Residential and Consumer credit quality indicators | Real estate loans | Residential | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
Residential and Consumer credit quality indicators | Real estate loans | Residential | Loss
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
Residential and Consumer credit quality indicators | Consumer
Financing Receivable, Recorded Investment [Line Items]
Total loans	619	1,533
Residential and Consumer credit quality indicators | Consumer | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans	619	1,166
Residential and Consumer credit quality indicators | Consumer | Special mention
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
Residential and Consumer credit quality indicators | Consumer | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	2
Residential and Consumer credit quality indicators | Consumer | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
Residential and Consumer credit quality indicators | Consumer | Loss
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	365
Residential and Consumer credit quality indicators | Originated
Financing Receivable, Recorded Investment [Line Items]
Total loans	186,299	187,770
Residential and Consumer credit quality indicators | Originated | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans	182,131	185,583
Residential and Consumer credit quality indicators | Originated | Special mention
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	216
Residential and Consumer credit quality indicators | Originated | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans	4,168	1,630
Residential and Consumer credit quality indicators | Originated | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
Residential and Consumer credit quality indicators | Originated | Loss
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	341
Residential and Consumer credit quality indicators | Originated | Real estate loans | Residential
Financing Receivable, Recorded Investment [Line Items]
Total loans	186,107	187,098
Residential and Consumer credit quality indicators | Originated | Real estate loans | Residential | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans	181,939	185,252
Residential and Consumer credit quality indicators | Originated | Real estate loans | Residential | Special mention
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	216
Residential and Consumer credit quality indicators | Originated | Real estate loans | Residential | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans	4,168	1,630
Residential and Consumer credit quality indicators | Originated | Real estate loans | Residential | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
Residential and Consumer credit quality indicators | Originated | Real estate loans | Residential | Loss
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
Residential and Consumer credit quality indicators | Originated | Consumer
Financing Receivable, Recorded Investment [Line Items]
Total loans	192	672
Residential and Consumer credit quality indicators | Originated | Consumer | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans	192	331
Residential and Consumer credit quality indicators | Originated | Consumer | Special mention
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
Residential and Consumer credit quality indicators | Originated | Consumer | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
Residential and Consumer credit quality indicators | Originated | Consumer | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
Residential and Consumer credit quality indicators | Originated | Consumer | Loss
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	341
Residential and Consumer credit quality indicators | Acquired
Financing Receivable, Recorded Investment [Line Items]
Total loans	7,844	9,492
Residential and Consumer credit quality indicators | Acquired | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans	7,405	8,481
Residential and Consumer credit quality indicators | Acquired | Special mention
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	49
Residential and Consumer credit quality indicators | Acquired | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans	439	938
Residential and Consumer credit quality indicators | Acquired | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
Residential and Consumer credit quality indicators | Acquired | Loss
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	24
Residential and Consumer credit quality indicators | Acquired | Real estate loans | Residential
Financing Receivable, Recorded Investment [Line Items]
Total loans	7,417	8,631
Residential and Consumer credit quality indicators | Acquired | Real estate loans | Residential | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans	6,978	7,646
Residential and Consumer credit quality indicators | Acquired | Real estate loans | Residential | Special mention
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	49
Residential and Consumer credit quality indicators | Acquired | Real estate loans | Residential | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans	439	936
Residential and Consumer credit quality indicators | Acquired | Real estate loans | Residential | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
Residential and Consumer credit quality indicators | Acquired | Real estate loans | Residential | Loss
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
Residential and Consumer credit quality indicators | Acquired | Consumer
Financing Receivable, Recorded Investment [Line Items]
Total loans	427	861
Residential and Consumer credit quality indicators | Acquired | Consumer | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans	427	835
Residential and Consumer credit quality indicators | Acquired | Consumer | Special mention
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
Residential and Consumer credit quality indicators | Acquired | Consumer | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	2
Residential and Consumer credit quality indicators | Acquired | Consumer | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
Residential and Consumer credit quality indicators | Acquired | Consumer | Loss
Financing Receivable, Recorded Investment [Line Items]
Total loans	$ 0	$ 24

Loans Receivable and Allowanc69

Loans Receivable and Allowance for Loan Losses - Summary of loan portfolio delinquencies by portfolio segment and amount (Details 6) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	$ 25,837	$ 6,355
Current	1,517,179	1,359,584
Carrying Amount > 90 Days and Accruing	1,543,016	1,365,939
31-60 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	15,597	1,118
61-90 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	6,522	2,992
Greater Than 90 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	3,718	2,245
Originated
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	23,759	3,817
Current	1,459,172	1,291,894
Carrying Amount > 90 Days and Accruing	1,482,931	1,295,711
Originated | 31-60 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	14,844	147
Originated | 61-90 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	6,360	2,021
Originated | Greater Than 90 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	2,555	1,649
Originated | Commercial business
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	4,365	378
Current	245,354	198,078
Carrying Amount > 90 Days and Accruing	249,719	198,456
Originated | Commercial business | 31-60 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	4,223	0
Originated | Commercial business | 61-90 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Originated | Commercial business | Greater Than 90 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	142	378
Originated | Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Current	192	672
Carrying Amount > 90 Days and Accruing	192	672
Originated | Consumer | 31-60 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Originated | Consumer | 61-90 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Originated | Consumer | Greater Than 90 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Originated | Residential | Real estate loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	4,305	1,142
Current	181,802	185,956
Carrying Amount > 90 Days and Accruing	186,107	187,098
Originated | Residential | Real estate loans | 31-60 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1,092	0
Originated | Residential | Real estate loans | 61-90 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	2,244	173
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	15,089	2,297
Current	930,188	799,859
Carrying Amount > 90 Days and Accruing	945,277	802,156
Originated | Commercial | Real estate loans | 31-60 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	9,529	147
Originated | Commercial | Real estate loans | 61-90 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	4,116	1,848
Originated | Commercial | Real estate loans | Greater Than 90 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1,444	302
Originated | Construction | Real estate loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Current	101,636	107,329
Carrying Amount > 90 Days and Accruing	101,636	107,329
Originated | Construction | Real estate loans | 31-60 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Originated | Construction | Real estate loans | 61-90 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Originated | Construction | Real estate loans | Greater Than 90 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Acquired
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	2,078	2,538
Current	58,007	67,690
Carrying Amount > 90 Days and Accruing	60,085	70,228
Acquired | 31-60 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	753	971
Acquired | 61-90 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	162	971
Acquired | Greater Than 90 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1,163	596
Acquired | Commercial business
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	596	348
Current	9,680	17,110
Carrying Amount > 90 Days and Accruing	10,276	17,458
Acquired | Commercial business | 31-60 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	95	99
Acquired | Commercial business | 61-90 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	162	249
Acquired | Commercial business | Greater Than 90 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	339	0
Acquired | Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	5	6
Current	422	855
Carrying Amount > 90 Days and Accruing	427	861
Acquired | Consumer | 31-60 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	3	6
Acquired | Consumer | 61-90 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Acquired | Consumer | Greater Than 90 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	2	0
Acquired | Residential | Real estate loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	348	453
Current	7,069	8,178
Carrying Amount > 90 Days and Accruing	7,417	8,631
Acquired | Residential | Real estate loans | 31-60 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	156	0
Acquired | Residential | Real estate loans | 61-90 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Acquired | Residential | Real estate loans | Greater Than 90 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	192	453
Acquired | Commercial | Real estate loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1,129	1,731
Current	40,836	41,435
Carrying Amount > 90 Days and Accruing	41,965	43,166
Acquired | Commercial | Real estate loans | 31-60 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	499	866
Acquired | Commercial | Real estate loans | 61-90 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	722
Acquired | Commercial | Real estate loans | Greater Than 90 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	$ 630	143
Acquired | Construction | Real estate loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		0
Current		112
Carrying Amount > 90 Days and Accruing		112
Acquired | Construction | Real estate loans | 31-60 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		0
Acquired | Construction | Real estate loans | 61-90 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		0
Acquired | Construction | Real estate loans | Greater Than 90 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		$ 0

Loans Receivable and Allowanc70

Loans Receivable and Allowance for Loan Losses - Summary of nonaccrual loans by portfolio segment (Details 7) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total nonaccrual loans	$ 5,481	$ 2,937
Commercial business
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total nonaccrual loans	520	538
Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total nonaccrual loans	0	341
Residential | Real estate loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total nonaccrual loans	1,590	1,612
Commercial | Real estate loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total nonaccrual loans	$ 3,371	$ 446

Loans Receivable and Allowanc71

Loans Receivable and Allowance for Loan Losses - Summary of impaired loans (Details 8) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Originated
Impaired loans without a valuation allowance:
Impaired loans without a valuation allowance, Carrying Amount	$ 5,483	$ 2,430	$ 7,033
Impaired loans without a valuation allowance, Unpaid Principal Balance	5,517	2,473	7,056
Impaired loans without a valuation allowance, Average Carrying Amount	5,582	2,891	7,084
Impaired loans without a valuation allowance, Interest Income Recognized	81	115	210
Impaired loans with a valuation allowance:
Impaired loans with a valuation allowance, Carrying Amount	7,227	833	1,490
Impaired loans with a valuation allowance, Unpaid Principal Balance	7,227	833	1,554
Impaired loans with a valuation allowance, Associated Allowance	901	347	73
Impaired loans with a valuation allowance, Average Carrying Amount	7,291	886	1,537
Impaired loans with a valuation allowance, Interest Income Recognized	308	28	62
Total impaired loans
Total impaired loans, Carrying Amount	12,710	3,263	8,523
Total impaired loans, Unpaid Principal Balance	12,744	3,306	8,610
Total impaired loans, Associated Allowance	901	347	73
Total impaired loans, Average Carrying Amount	12,873	3,777	8,621
Total impaired loans, Interest Income Recognized	389	143	272
Originated | Commercial business
Impaired loans without a valuation allowance:
Impaired loans without a valuation allowance, Carrying Amount	1,548	551	1,351
Impaired loans without a valuation allowance, Unpaid Principal Balance	1,548	584	1,372
Impaired loans without a valuation allowance, Average Carrying Amount	1,621	987	1,374
Impaired loans without a valuation allowance, Interest Income Recognized	70	76	49
Impaired loans with a valuation allowance:
Impaired loans with a valuation allowance, Carrying Amount	578	369	626
Impaired loans with a valuation allowance, Unpaid Principal Balance	578	369	690
Impaired loans with a valuation allowance, Associated Allowance	51	5	71
Impaired loans with a valuation allowance, Average Carrying Amount	588	417	673
Impaired loans with a valuation allowance, Interest Income Recognized	47	22	34
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		0
Originated | Residential | Real estate loans
Impaired loans without a valuation allowance:
Impaired loans without a valuation allowance, Carrying Amount	3,076	1,228	1,391
Impaired loans without a valuation allowance, Unpaid Principal Balance	3,094	1,238	1,393
Impaired loans without a valuation allowance, Average Carrying Amount	3,080	1,236	1,402
Impaired loans without a valuation allowance, Interest Income Recognized	0	10	37
Impaired loans with a valuation allowance:
Impaired loans with a valuation allowance, Carrying Amount	1,092		864
Impaired loans with a valuation allowance, Unpaid Principal Balance	1,092		864
Impaired loans with a valuation allowance, Associated Allowance	8		2
Impaired loans with a valuation allowance, Average Carrying Amount	1,100		864
Impaired loans with a valuation allowance, Interest Income Recognized	0		28
Originated | Commercial | Real estate loans
Impaired loans without a valuation allowance:
Impaired loans without a valuation allowance, Carrying Amount	859	651	4,291
Impaired loans without a valuation allowance, Unpaid Principal Balance	875	651	4,291
Impaired loans without a valuation allowance, Average Carrying Amount	881	668	4,308
Impaired loans without a valuation allowance, Interest Income Recognized	11	29	124
Impaired loans with a valuation allowance:
Impaired loans with a valuation allowance, Carrying Amount	5,557	123
Impaired loans with a valuation allowance, Unpaid Principal Balance	5,557	123
Impaired loans with a valuation allowance, Associated Allowance	842	1
Impaired loans with a valuation allowance, Average Carrying Amount	5,603	128
Impaired loans with a valuation allowance, Interest Income Recognized	261	6
Originated | Construction | Real estate loans
Impaired loans without a valuation allowance:
Impaired loans without a valuation allowance, Carrying Amount	0
Impaired loans without a valuation allowance, Unpaid Principal Balance	0
Impaired loans without a valuation allowance, Average Carrying Amount	0
Impaired loans without a valuation allowance, Interest Income Recognized	0
Acquired
Impaired loans without a valuation allowance:
Impaired loans without a valuation allowance, Carrying Amount	1,823	1,025	1,771
Impaired loans without a valuation allowance, Unpaid Principal Balance	1,978	1,055	1,841
Impaired loans without a valuation allowance, Average Carrying Amount	1,973	1,085	1,799
Impaired loans without a valuation allowance, Interest Income Recognized	29	45	62
Impaired loans with a valuation allowance:
Impaired loans with a valuation allowance, Carrying Amount	320	561	628
Impaired loans with a valuation allowance, Unpaid Principal Balance	322	561	638
Impaired loans with a valuation allowance, Associated Allowance	54	71	38
Impaired loans with a valuation allowance, Average Carrying Amount	536	577	664
Impaired loans with a valuation allowance, Interest Income Recognized	0	19	18
Total impaired loans
Total impaired loans, Carrying Amount	2,143	1,586	2,399
Total impaired loans, Unpaid Principal Balance	2,300	1,616	2,479
Total impaired loans, Associated Allowance	54	71	38
Total impaired loans, Average Carrying Amount	2,509	1,662	2,463
Total impaired loans, Interest Income Recognized	29	64	80
Acquired | Commercial business
Impaired loans without a valuation allowance:
Impaired loans without a valuation allowance, Carrying Amount	402	572	963
Impaired loans without a valuation allowance, Unpaid Principal Balance	476	593	963
Impaired loans without a valuation allowance, Average Carrying Amount	488	629	999
Impaired loans without a valuation allowance, Interest Income Recognized	19	36	54
Impaired loans with a valuation allowance:
Impaired loans with a valuation allowance, Carrying Amount	132	390	470
Impaired loans with a valuation allowance, Unpaid Principal Balance	134	390	480
Impaired loans with a valuation allowance, Associated Allowance	20	37	21
Impaired loans with a valuation allowance, Average Carrying Amount	285	406	506
Impaired loans with a valuation allowance, Interest Income Recognized	0	19	14
Acquired | Consumer
Impaired loans without a valuation allowance:
Impaired loans without a valuation allowance, Carrying Amount	0
Impaired loans without a valuation allowance, Unpaid Principal Balance	0
Impaired loans without a valuation allowance, Average Carrying Amount	0
Impaired loans without a valuation allowance, Interest Income Recognized	0
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		0	1
Acquired | Residential | Real estate loans
Impaired loans without a valuation allowance:
Impaired loans without a valuation allowance, Carrying Amount	439	453	197
Impaired loans without a valuation allowance, Unpaid Principal Balance	462	462	200
Impaired loans without a valuation allowance, Average Carrying Amount	450	456	198
Impaired loans without a valuation allowance, Interest Income Recognized	0	9	2
Acquired | Commercial | Real estate loans
Impaired loans without a valuation allowance:
Impaired loans without a valuation allowance, Carrying Amount	982		611
Impaired loans without a valuation allowance, Unpaid Principal Balance	1,040		678
Impaired loans without a valuation allowance, Average Carrying Amount	1,035		602
Impaired loans without a valuation allowance, Interest Income Recognized	10		6
Impaired loans with a valuation allowance:
Impaired loans with a valuation allowance, Carrying Amount	188	144	151
Impaired loans with a valuation allowance, Unpaid Principal Balance	188	144	151
Impaired loans with a valuation allowance, Associated Allowance	34	7	12
Impaired loans with a valuation allowance, Average Carrying Amount	251	144	151
Impaired loans with a valuation allowance, Interest Income Recognized	$ 0	$ 0	$ 3

Loans Receivable and Allowanc72

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, 2017USD ($)Loan	Dec. 31, 2016USD ($)Loan	Dec. 31, 2015USD ($)Loan
Financing Receivable, Modifications [Line Items]
Number of Loans | Loan	6	3	4
Outstanding Recorded Investment Pre-Modification	$ 3,698	$ 299	$ 4,083
Outstanding Recorded Investment Post-Modification	$ 3,698	$ 299	$ 4,083
Commercial business
Financing Receivable, Modifications [Line Items]
Number of Loans | Loan	4	2	1
Outstanding Recorded Investment Pre-Modification	$ 741	$ 237	$ 39
Outstanding Recorded Investment Post-Modification	$ 741	$ 237	$ 39
Commercial | Real estate loans
Financing Receivable, Modifications [Line Items]
Number of Loans | Loan	2	0	0
Outstanding Recorded Investment Pre-Modification	$ 2,957	$ 0	$ 0
Outstanding Recorded Investment Post-Modification	$ 2,957	$ 0	$ 0
Residential | Real estate loans
Financing Receivable, Modifications [Line Items]
Number of Loans | Loan	0	1	3
Outstanding Recorded Investment Pre-Modification	$ 0	$ 62	$ 4,044
Outstanding Recorded Investment Post-Modification	$ 0	$ 62	$ 4,044

Loans Receivable and Allowanc73

Loans Receivable and Allowance for Loan Losses - Summary of loans were modified as TDR (Details 10) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable, Gross, Allowance, and Net [Abstract]
Maturity Concession	$ 638	$ 299	$ 0
Maturity/amortization concession	0	0	825
Maturity and payment concession	1,925	0	3,258
Maturity and rate concession	1,032	0	0
Payment concession	103	0	0
Total	$ 3,698	$ 299	$ 4,083

Loans Receivable and Allowanc74

Loans Receivable and Allowance for Loan Losses (Detail Textuals) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
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%
Allowance for loan losses pretax reduction in the reserve	$ 1,300
Income contractually due but not recognized on originated nonaccrual loans	174	$ 17	$ 25
Actual interest income recognized	68	74	$ 43
Recorded investment in TDR	4,900	1,400
TDR on non accrual status	553	$ 66
The total recorded investment on 3 loans modified	$ 1,200
Real estate loans | Residential
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, 2017	Dec. 31, 2016
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	$ 28,529	$ 27,327
Accumulated depreciation and amortization	(10,333)	(9,492)
Premises and equipment, net	18,196	17,835
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	14,030	14,061
Leasehold improvements
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	4,558	4,532
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	3,096	2,118
Equipment
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	4,478	4,249
Automobiles
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	$ 67	$ 67

Premises and Equipment (Detail

Premises and Equipment (Detail Textuals) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Property, Plant and Equipment [Abstract]
Depreciation and amortization expense	$ 1,513	$ 1,729	$ 1,685

Other Assets - Summary of compo

Other Assets - Summary of components of other assets (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Other Assets [Abstract]
Deferred Compensation	$ 4,097	$ 3,582
Servicing Asset	1,113	0
Derivative Assets	2,035	966
Other	3,203	2,626
Total Other Assets	$ 10,448	$ 7,174

Other Assets - Summary of chang

Other Assets - Summary of changes in carrying value for loan servicing assets(Details 1) $ in Thousands	12 Months Ended
	Dec. 31, 2017USD ($)
Loan Servicing Rights:
Balance at beginning of year	$ 0
Servicing rights capitalized	115
Servicing rights amortized	(58)
Servicing rights not previously capitalized	1,056
Balance at end of year	$ 1,113

Other Assets (Detail Textuals)

Other Assets (Detail Textuals) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Servicing Assets at Fair Value [Line Items]
Loans serviced for others	$ 122,800	$ 121,800
Carrying value of loan servicing rights	1,100	$ 0
Loan servicing liabilities related to loans serviced for others	$ 83
Minimum
Servicing Assets at Fair Value [Line Items]
Discount rate	7.00%
Pre-payment speed assumptions	7.00%
Maximum
Servicing Assets at Fair Value [Line Items]
Discount rate	12.00%
Pre-payment speed assumptions	9.00%

Deposits - Components of deposi

Deposits - Components of deposits (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Deposits [Abstract]
Noninterest bearing demand deposit accounts	$ 172,638	$ 187,593
Interest bearing accounts:
NOW and money market	510,746	403,081
Savings	83,758	96,502
Time certificates of deposit	631,263	601,861
Total interest bearing accounts	1,225,767	1,101,444
Total deposits	$ 1,398,405	$ 1,289,037

Deposits - Contractual maturiti

Deposits - Contractual maturities of time certificates of deposit (Details 1) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Deposits [Abstract]
2,017		$ 323,742
2,018	$ 391,509	247,517
2,019	214,383	29,778
2,020	24,466	433
2,021	373	391
2,022	532
Total time certificates of deposit	$ 631,263	$ 601,861

Deposits - Interest expense by

Deposits - Interest expense by account type (Details 2) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Deposits [Abstract]
NOW and money market	$ 3,520	$ 1,945	$ 1,473
Savings	763	315	693
Time certificates of deposit	8,411	6,040	3,515
Total interest expense on deposits	$ 12,694	$ 8,300	$ 5,681

Deposits (Detail textuals)

Deposits (Detail textuals) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Deposits [Abstract]
Individual certificate with balances of $250,000 or more	$ 153.8	$ 148.5
Brokered deposits	44.3	58.2
Brokered deposits with balances of $250,000 or more	$ 43.5	$ 57

Federal Loan Bank Advances an84

Federal Loan Bank Advances and Other Borrowings - Summary of FHLB advances with maturity dates and weighted average rates (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Year of Maturity: Amount Due
2,017	$ 0	$ 135,000
2,018	174,000	0
2,020	25,000	25,000
Total advances Amount Due	$ 199,000	$ 160,000
Year of Maturity: Weighted Average Rate
2,017	0.00%	0.73%
2,018	1.44%	0.00%
2,020	1.99%	1.99%
Total advances Weighted Average Rate	1.51%	0.92%

Federal Loan Bank Advances an85

Federal Loan Bank Advances and Other Borrowings (Detail Textuals) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2017	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	$ 150,000
Interest expense on FHLB advances	2,000	$ 1,300	$ 903
Loans pledge as collateral for borrowing at FHLB of Boston	742,000
FHLB advances, immediate availability to borrow	$ 257,600
Number of FHLB shares owned	91,827	79,430
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
Atlantic Community Bankers Bank | Unsecured line of credit
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Unsecured line of credit	7,500	$ 7,500
Zion's Bank | Unsecured line of credit
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Unsecured line of credit	$ 25,000

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 - Future minimum rental lease (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Commitments and Contingencies Disclosure [Abstract]
2,018	$ 1,808
2,019	1,774
2,020	1,666
2,021	1,561
2,022	937
Thereafter	13,977
Total	$ 21,723	$ 19,200

Commitments and Contingencies88

Commitments and Contingencies - Commitments to extend credit (Details 1) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Outstanding commitments	$ 200,286	$ 168,434
Loan commitments
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Outstanding commitments	112,649	89,825
Undisbursed construction loans
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Outstanding commitments	80,064	70,526
Unused home equity lines of credit
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Outstanding commitments	$ 7,573	$ 8,083

Commitments and Contingencies89

Commitments and Contingencies (Detail Textuals) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Commitments and Contingencies Disclosure [Abstract]
Future lease obligations	$ 21,723	$ 19,200
Term of lease contract	98 years 11 months
Current lease payment per year	$ 144
Rental expenses	1,800	$ 2,000	$ 1,800
Reserve for unfunded commitments	$ 250

Income Taxes - Income tax expen

Income Taxes - Income tax expense (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Current provision:
Federal									$ 7,468	$ 6,838	$ 5,113
State									431	226	694
Total current									7,899	7,064	5,807
Deferred provision (benefit):
Federal									3,400	(1,104)	(1,749)
State									0	0	783
Total deferred									3,908	(1,104)	(966)
Total income tax expense	$ 5,275	$ 1,895	$ 2,394	$ 1,735	$ 1,850	$ 1,437	$ 1,320	$ 1,353	$ 11,299	$ 5,960	$ 4,841

Income Taxes - Reconciliation o

Income Taxes - Reconciliation of income tax expense (Details 1) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Income tax expense at statutory federal rate									$ 8,795	$ 6,409	$ 4,855
State tax expense, net of federal tax effect									280	147	566
Statutory rate reductions									3,270	0	811
Income exempt from tax									(822)	(687)	(627)
Benefits related to stock compensation									(490)	0	0
Other items, net									266	91	42
Income tax expense before change in valuation allowance									11,299	5,960	5,647
Change in valuation allowance									0	0	(806)
Total income tax expense	$ 5,275	$ 1,895	$ 2,394	$ 1,735	$ 1,850	$ 1,437	$ 1,320	$ 1,353	$ 11,299	$ 5,960	$ 4,841

Income Taxes - Components of de

Income Taxes - Components of deferred tax assets and liabilities (Details 2) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Deferred tax assets:
Allowance for loan losses	$ 4,022	$ 6,378
Net operating loss carryforwards	555	996
Purchase accounting adjustments	14	20
Deferred fees	1,162	1,437
Deferred expenses	0	716
Start-up costs	144	275
Depreciation	67	0
Other	88	192
Gross deferred tax assets	6,052	10,014
Deferred tax liabilities:
Deferred Expenses	482	0
Servicing Rights	216	0
Tax bad debt reserve	0	195
Depreciation	0	255
Unrealized gain on derivatives	427	258
Unrealized gain on available for sale securities	23	221
Gross deferred tax liabilities	1,148	929
Net deferred tax asset	$ 4,904	$ 9,085

Income Taxes - Reconciliation93

Income Taxes - Reconciliation of the beginning and ending balances of the Company's uncertain tax positions (Details 3) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance, beginning of year	$ 95	$ 0	$ 0
Additions relating to potential liability with taxing authorities	298	95	0
Balance, end of year	$ 393	$ 95	$ 0

Income Taxes (Detail textuals)

Income Taxes (Detail textuals) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Operating Loss Carryforwards [Line Items]
Statutory federal income tax rate	35.00%
Corporate income tax rate effective in 2018	21.00%
Write-down of deferred tax asset due to tax law changes	$ 3,300
Uncertain tax positions	393	$ 95	$ 0	$ 0
Federal
Operating Loss Carryforwards [Line Items]
Operating loss carryovers	2,600
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, 2017	Dec. 31, 2016	Dec. 31, 2015
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	$ 257	$ 227	$ 173

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, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Earnings Per Share [Abstract]
Net income		$ 2,096	$ 4,263	$ 3,769	$ 3,702	$ 3,323	$ 3,140	$ 2,896	$ 2,991	$ 13,830	$ 12,350	$ 9,030
Preferred stock dividends										0	0	(125)
Dividends to participating securities	[1]									(28)	(27)	(5)
Undistributed earnings allocated to participating securities	[1]									(151)	(211)	(226)
Net income for earnings per share calculation										$ 13,651	$ 12,112	$ 8,674
Weighted average shares outstanding, basic (in shares)										7,572,409	7,396,019	7,071,550
Effect of dilutive equity-based awards (in shares)	[2]									98	95	69
Weighted average shares outstanding, diluted (in shares)										7,670,413	7,491,052	7,140,558
Net earnings per common share:
Basic earnings per common share (in dollars per share)		$ 0.27	$ 0.55	$ 0.49	$ 0.49	$ 0.44	$ 0.42	$ 0.38	$ 0.4	$ 1.80	$ 1.64	$ 1.23
Diluted earnings per common share (in dollars per share)		$ 0.27	$ 0.55	$ 0.49	$ 0.48	$ 0.43	$ 0.41	$ 0.38	$ 0.4	$ 1.78	$ 1.62	$ 1.21
[1]	Represents dividends paid and undistributed earnings allocated to unvested stock-based awards that contain non-forfeitable rights to dividends.
[2]	Represents the effect of the assumed exercise of stock options and warrants and the vesting of restricted shares, as applicable, utilizing the treasury stock method.

Stock Based Compensation Plan97

Stock Based Compensation Plans - Outstanding stock options (Details) - Employee Stock Option	12 Months Ended
	Dec. 31, 2017$ / sharesshares
Number of Shares
Options outstanding at beginning of period | shares	120,988
Exercised | shares	(73,738)
Expired | shares	(200)
Options outstanding at end of period | shares	47,050
Options exercisable at end of period | shares	47,050
Weighted Average Exercise Price
Options outstanding at beginning of period | $ / shares	$ 18.58
Exercised | $ / shares	19.06
Expired | $ / shares	15
Options outstanding at end of period | $ / shares	17.83
Options exercisable at end of period | $ / shares	$ 17.83

Stock Based Compensation Plan98

Stock Based Compensation Plans - Summary of information for options (Details 1)	12 Months Ended
	Dec. 31, 2017$ / sharesshares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of Shares | shares	47,050
Weighted- Average Remaining Contractual Life (years)	2 years 9 months 18 days
Weighted- Average Exercise Price	$ 17.83
Range of Exercise Prices, $17.86 - 20.81
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of Shares | shares	34,700
Range of Exercise Prices, Lower Range Limit	$ 17.86
Range of Exercise Prices, Upper Range Limit	$ 20.81
Weighted- Average Remaining Contractual Life (years)	2 years 9 months 18 days
Weighted- Average Exercise Price	$ 19.28
Range of Exercise Prices, $11.00 - 15.00
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of Shares | shares	12,350
Range of Exercise Prices, Lower Range Limit	$ 11
Range of Exercise Prices, Upper Range Limit	$ 15
Weighted- Average Remaining Contractual Life (years)	3 years
Weighted- Average Exercise Price	$ 13.77

Stock Based Compensation Plan99

Stock Based Compensation Plans - Activity for restricted stock (Details 2)	12 Months Ended
	Dec. 31, 2017$ / sharesshares
Number of Shares
Unvested at beginning of period | shares	96,594
Granted | shares	40,250
Vested | shares	(43,430)
Forfeited | shares	(18,228)
Unvested at end of period | shares	75,186
Weighted Average Grant Date Fair Value
Unvested at beginning of period | $ / shares	$ 19.80
Granted | $ / shares	34.03
Vested | $ / shares	21.35
Forfeited | $ / shares	20.52
Unvested at end of period | $ / shares	$ 26.39

Stock Based Compensation Pla100

Stock Based Compensation Plans (Detail Textuals) $ / shares in Units, $ in Thousands	Dec. 09, 2014	Dec. 31, 2017USD ($)Plan$ / sharesshares	Dec. 31, 2016USD ($)	Dec. 31, 2015USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of equity award plans | Plan		5
Number of options exercisable | shares		47,050
Weighted average remaining contractual life		2 years 9 months 18 days
Range of Exercise Prices, $11.00 to $20.81
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of options exercisable | shares		47,050
Range of exercise prices, lower limit | $ / shares		$ 11
Range of exercise prices, upper limit | $ / shares		$ 20.81
Weighted average remaining contractual life		2 years 9 months 18 days
Aggregate intrinsic value of exercisable options		$ 800
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		$ 0	$ 9	$ 14
Total intrinsic value of share options exercised		1,080	597	170
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based compensation expenses		917	1,200	1,000
Total fair value of restricted stock awards vested		1,500
Unrecognized stock compensation expense for restricted stock		$ 1,800
Weighted average period for recognition of compensation expense for restricted stock		1 year 9 months 18 days
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		465,262
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		$ 0	$ 304	$ 134

Stock Based Compensation Pla101

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, 2017	Dec. 31, 2016	Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based compensation expenses			$ 917	$ 1,200	$ 1,000
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 having vested 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			$ 0	$ 304	$ 134
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, 2017	Dec. 31, 2016	Dec. 31, 2015
Accumulated Other Comprehensive Income Loss [Roll Forward]
Balance	$ 890	$ 227	$ 531
Other comprehensive (loss) income before reclassifications, net of tax	611	588	(304)
Amounts reclassified from accumulated other comprehensive income, net of tax	(108)	75	0
Net other comprehensive income	503	663	(304)
Amount reclassified for tax rate changes	301
Balance	1,694	890	227
Net Unrealized Gain (Loss) on Available for Sale Securities
Accumulated Other Comprehensive Income Loss [Roll Forward]
Balance	409	405	644
Other comprehensive (loss) income before reclassifications, net of tax	(232)	(71)	(239)
Amounts reclassified from accumulated other comprehensive income, net of tax	(108)	75	0
Net other comprehensive income	(340)	4	(239)
Amount reclassified for tax rate changes	16
Balance	85	409	405
Net Unrealized Gain (Loss) on Interest Rate Swap
Accumulated Other Comprehensive Income Loss [Roll Forward]
Balance	481	(178)	(113)
Other comprehensive (loss) income before reclassifications, net of tax	843	659	(65)
Amounts reclassified from accumulated other comprehensive income, net of tax	0	0	0
Net other comprehensive income	843	659	(65)
Amount reclassified for tax rate changes	285
Balance	$ 1,609	$ 481	$ (178)

Comprehensive Income - Summa103

Comprehensive Income - Summary of reclassified from accumulated other comprehensive income or loss (Details 1) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Available-for-sale securities:
Unrealized gains (losses) on investments	$ 165	$ (115)
Tax (expense) benefit	(57)	40	$ 0
Net of tax	108	(75)	0
Amount Reclassified from Accumulated Other Comprehensive Income
Available-for-sale securities:
Net of tax	108	(75)	0
Unrealized gains on available for sale securities | Amount Reclassified from Accumulated Other Comprehensive Income
Available-for-sale securities:
Unrealized gains (losses) on investments	165	(115)	0
Tax (expense) benefit	(57)	40	0
Net of tax	$ 108	$ (75)	$ 0

Derivative Instruments - Inform

Derivative Instruments - Information about derivative instruments (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Cash flow hedge:
Notional Amount	$ 25,000
Cash flow hedge
Cash flow hedge:
Notional Amount	150,000	$ 100,000
Fair Value	2,034	737
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 USD LIBOR	3-month LIBOR
Paid	1.62%	1.62%
Fair Value	$ 62	$ (91)
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 USD LIBOR	3-month LIBOR
Paid	1.83%	1.83%
Fair Value	$ 105	$ (138)
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 USD LIBOR	3-month LIBOR
Paid	1.48%	1.48%
Fair Value	$ 398	$ 249
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 USD LIBOR	3-month LIBOR
Paid	1.22%	1.22%
Fair Value	$ 793	$ 717
Cash flow hedge | Interest rate swap on FHLB advance
Cash flow hedge:
Notional Amount	$ 25,000
Original Maturity	7 years
Received	3-month USD LIBOR
Paid	2.04%
Fair Value	$ 342
Cash flow hedge | Interest rate swap on FHLB advance
Cash flow hedge:
Notional Amount	$ 25,000
Original Maturity	7 years
Received	3-month USD LIBOR
Paid	2.04%
Fair Value	$ 334

Derivative Instruments - Forwar

Derivative Instruments - Forward starting interest rate swap transactions (Details 1) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Derivative [Line Items]
Notional Amount	$ 25,000
Cash flow hedge
Derivative [Line Items]
Notional Amount	150,000	$ 100,000
Interest rate swap | Cash flow hedge
Derivative [Line Items]
Notional Amount	$ 25,000	$ 25,000
Duration of Borrowing	4 years 8 months 12 days	4 years 8 months 12 days
Interest rate swap | Cash flow hedge | 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
Interest rate swap | Cash flow hedge | 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
Interest rate swap | Cash flow hedge | 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
Interest rate swap | Cash flow hedge | 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
Interest rate swap | Cash flow hedge | FHLB 90-day advance | August?25, 2017
Derivative [Line Items]
Notional Amount	$ 25,000
Effective Date of Hedged Borrowing	Aug. 25, 2017
Duration of Borrowing	7 years
Counterparty	Bank of Montreal
Interest rate swap | Cash flow hedge | FHLB 90-day advance | August?25, 2017
Derivative [Line Items]
Notional Amount	$ 25,000
Effective Date of Hedged Borrowing	Aug. 25, 2017
Duration of Borrowing	7 years
Counterparty	FTN Financial Capital Markets

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, 2017	Dec. 31, 2016	Dec. 31, 2015
Interest rate swap on FHLB advance:
Unrealized gain recognized in accumulated other comprehensive income	$ 1,297	$ 1,013	$ (89)
Income tax expense on items recognized in accumulated other comprehensive income	(454)	(354)	24
Other comprehensive income	843	659	$ (65)
Amount recognized in interest expense on hedged FHLB advance	$ 1,909	$ 1,386

Derivative Instruments (Detail

Derivative Instruments (Detail Textuals) $ in Millions	12 Months Ended
	Dec. 31, 2017USD ($)
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Notional amount	$ 25
Derivative description	Libor interest rate swaps to convert rolling 90 day Federal Home Loan Bank advances to fixed rates.

Fair Value of Financial Inst108

Fair Value of Financial Instruments - Carrying values and fair values of financial instruments (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Financial Assets:
Federal funds sold	$ 186	$ 329
Available for sale securities	92,188	87,751
Held to maturity securities	21,579	16,859
Servicing asset	1,113	0
Carrying Value
Financial Assets:
Cash and due from banks	70,545	96,026
Federal funds sold	186	329
Available for sale securities	92,188	87,751
Held to maturity securities	21,579	16,859
Loans receivable, net	1,520,879	254
Accrued interest receivable	5,910	1,343,895
FHLB stock	9,183	4,958
Servicing asset	1,113	7,943
Derivative asset	2,034	966
Financial Liabilities:
Demand deposits	172,638	187,593
NOW and money market	510,746	402,982
Savings	83,758	96,601
Time deposits	631,263	601,861
Accrued interest payable	1,092	837
Advances from the FHLB	199,000	160,000
Subordinated debentures	25,103	25,051
Servicing liability	83	229
Fair Value
Financial Assets:
Cash and due from banks	70,545	96,026
Federal funds sold	186	329
Available for sale securities	92,188	87,751
Held to maturity securities	22,836	16,851
Loans receivable, net	1,494,599	254
Accrued interest receivable	5,910	1,339,055
FHLB stock	9,183	4,958
Servicing asset	1,113	7,943
Derivative asset	2,034	966
Financial Liabilities:
Demand deposits	172,638	187,593
NOW and money market	510,746	402,982
Savings	83,758	96,601
Time deposits	629,532	603,456
Accrued interest payable	1,092	837
Advances from the FHLB	198,932	160,118
Subordinated debentures	25,457	25,645
Servicing liability	83	229
Level 1 | Fair Value
Financial Assets:
Cash and due from banks	70,545	96,026
Federal funds sold	186	329
Available for sale securities	0	0
Held to maturity securities	0	0
Loans receivable, net	0	0
Accrued interest receivable	0	0
FHLB stock	0	0
Servicing asset	0	0
Derivative asset	0	0
Financial Liabilities:
Demand deposits	0	0
NOW and money market	0	0
Savings	0	0
Time deposits	0	0
Accrued interest payable	0	0
Advances from the FHLB	0	0
Subordinated debentures	0	0
Servicing liability	0	0
Level 2 | Fair Value
Financial Assets:
Cash and due from banks	0	0
Federal funds sold	0	0
Available for sale securities	92,188	87,751
Held to maturity securities	1,119	1,141
Loans receivable, net	0	254
Accrued interest receivable	5,910	0
FHLB stock	9,183	4,958
Servicing asset	0	7,943
Derivative asset	2,034	966
Financial Liabilities:
Demand deposits	172,638	187,593
NOW and money market	510,746	402,982
Savings	83,758	96,601
Time deposits	0	0
Accrued interest payable	1,092	837
Advances from the FHLB	0	0
Subordinated debentures	0	0
Servicing liability	0	229
Level 3 | Fair Value
Financial Assets:
Cash and due from banks	0	0
Federal funds sold	0	0
Available for sale securities	0	0
Held to maturity securities	21,717	15,710
Loans receivable, net	1,494,599	0
Accrued interest receivable	0	1,339,055
FHLB stock	0	0
Servicing asset	1,113	0
Derivative asset	0	0
Financial Liabilities:
Demand deposits	0	0
NOW and money market	0	0
Savings	0	0
Time deposits	629,532	603,456
Accrued interest payable	0	0
Advances from the FHLB	198,932	160,118
Subordinated debentures	25,457	25,645
Servicing liability	$ 83	$ 0

Fair Value of Financial Inst109

Fair Value of Financial Instruments (Detail Textuals)	12 Months Ended
	Dec. 31, 2017
Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Inputs, Discount Rate	7.00%
Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Inputs, Discount Rate	12.00%
Level 3 | Minimum | Fair Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Inputs, Discount Rate	4.50%
Level 3 | Maximum | Fair Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Inputs, Discount Rate	4.80%

Fair Value Measurements - Finan

Fair Value Measurements - Financial instruments carried at fair value on recurring basis (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Available-for-sale investment securities:
Available for sale securities	$ 92,188	$ 87,751
Fair Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative asset	2,034	966
Available-for-sale investment securities:
Available for sale securities	92,188	87,751
Level 1 | Fair Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative asset	0	0
Available-for-sale investment securities:
Available for sale securities	0	0
Level 2 | Fair Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative asset	2,034	966
Available-for-sale investment securities:
Available for sale securities	92,188	87,751
Level 3 | Fair Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative asset	0	0
Available-for-sale investment securities:
Available for sale securities	0	0
Fair Value Measurements Recurring | Level 1 | Fair Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative asset	0	0
Fair Value Measurements Recurring | Level 1 | U.S. Government and agency obligations | Fair Value
Available-for-sale investment securities:
Available for sale securities	0	0
Fair Value Measurements Recurring | Level 1 | State agency and municipal obligations | Fair Value
Available-for-sale investment securities:
Available for sale securities	0	0
Fair Value Measurements Recurring | Level 1 | Corporate bonds | Fair Value
Available-for-sale investment securities:
Available for sale securities	0	0
Fair Value Measurements Recurring | Level 2 | Fair Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative asset	2,034	737
Fair Value Measurements Recurring | Level 2 | U.S. Government and agency obligations | Fair Value
Available-for-sale investment securities:
Available for sale securities	72,774	62,698
Fair Value Measurements Recurring | Level 2 | State agency and municipal obligations | Fair Value
Available-for-sale investment securities:
Available for sale securities	12,277	14,763
Fair Value Measurements Recurring | Level 2 | Corporate bonds | Fair Value
Available-for-sale investment securities:
Available for sale securities	7,137	10,290
Fair Value Measurements Recurring | Level 3 | Fair Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative asset	0	0
Fair Value Measurements Recurring | Level 3 | U.S. Government and agency obligations | Fair Value
Available-for-sale investment securities:
Available for sale securities	0	0
Fair Value Measurements Recurring | Level 3 | State agency and municipal obligations | Fair Value
Available-for-sale investment securities:
Available for sale securities	0	0
Fair Value Measurements Recurring | Level 3 | Corporate bonds | Fair Value
Available-for-sale investment securities:
Available for sale securities	$ 0	$ 0

Fair Value Measurements - Fi111

Fair Value Measurements - Financial instruments carried at fair value on nonrecurring basis (Details 1) - Fair Value Measurements Nonrecurring - Estimate of Fair Value Measurement [Member] - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans	$ 0	$ 0
Foreclosed real estate	0	0
Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans	0	0
Foreclosed real estate	0	0
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans	14,853	4,849
Foreclosed real estate	$ 0	$ 272

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) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Unobservable Input, Discount rate	7.00%
Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Unobservable Input, Discount rate	12.00%
Level 3 | Minimum | Fair Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Unobservable Input, Discount rate	4.50%
Level 3 | Maximum | Fair Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Unobservable Input, Discount rate	4.80%
Level 3 | Fair Value Measurements Nonrecurring | Fair Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans	$ 14,853	$ 4,849
Foreclosed real estate	0	272
Level 3 | Fair Value Measurements Nonrecurring | Impaired loans | Fair Value | Appraisals
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans	7,711	2,127
Foreclosed real estate	$ 0	$ 272
Valuation Methodology, Appraisals	Appraisals	Appraisals
Level 3 | Fair Value Measurements Nonrecurring | Impaired loans | Fair Value | Discounted cash flows
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans	$ 7,142	$ 2,722
Valuation Methodology, Discounted cash flows	Discounted cash flows	Discounted cash flows
Level 3 | Fair Value Measurements Nonrecurring | Impaired loans | Minimum | Fair Value | Appraisals
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	3.25%	4.25%
Level 3 | Fair Value Measurements Nonrecurring | Impaired loans | Maximum | Fair Value | Appraisals
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Unobservable Input, Discount to appraised value	24.00%	28.00%
Unobservable Input, Discount rate	6.75%	6.25%
Level 3 | Fair Value Measurements Nonrecurring | Foreclosed real estate | Fair Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreclosed real estate	$ 0	$ 272
Valuation Methodology, Discounted cash flows	Discount to appraised value
Level 3 | Fair Value Measurements Nonrecurring | Foreclosed real estate | Fair Value | Appraisals
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Valuation Methodology, Appraisals	Appraisals	Appraisals
Unobservable Input, Discount to appraised value	0.00%	20.00%

Regulatory Matters - Capital am

Regulatory Matters - Capital amounts and ratios for Bank (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Bankwell Bank
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Common Equity Tier 1 Capital to Risk-Weighted Assets, Actual Capital, Amount	$ 173,728	$ 157,604
Common Equity Tier 1 Capital to Risk-Weighted Assets, Actual Capital, Ratio	10.99%	11.59%
Common Equity Tier 1 Capital to Risk-Weighted Assets,For Capital Adequacy Purposes, Amount	$ 71,106	$ 61,168
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	$ 102,709	$ 88,353
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	$ 192,632	$ 174,610
Total Capital to Risk-Weighted Assets, Actual Capital, Ratio	12.19%	12.85%
Total Capital to Risk-Weighted Assets, For Capital Adequacy Purposes, Amount	$ 126,411	$ 108,742
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	$ 158,014	$ 135,928
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	$ 173,728	$ 157,604
Tier I Capital to Risk-Weighted Assets, Actual Capital, Ratio	10.99%	11.59%
Tier I Capital to Risk-Weighted Assets, For Capital Adequacy Purposes, Amount	$ 94,808	$ 81,557
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	$ 126,411	$ 108,742
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	$ 173,728	$ 157,604
Tier I Capital to Average Assets, Actual Capital, Ratio	9.61%	10.10%
Tier I Capital to Average Assets, For Capital Adequacy Purposes, Amount	$ 72,349	$ 62,428
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	$ 90,437	$ 78,035
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	$ 155,977	$ 141,338
Common Equity Tier 1 Capital to Risk-Weighted Assets, Actual Capital, Ratio	9.83%	10.39%
Common Equity Tier 1 Capital to Risk-Weighted Assets,For Capital Adequacy Purposes, Amount	$ 71,369	$ 61,231
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	$ 199,984	$ 184,371
Total Capital to Risk-Weighted Assets, Actual Capital, Ratio	12.61%	13.55%
Total Capital to Risk-Weighted Assets, For Capital Adequacy Purposes, Amount	$ 126,878	$ 108,855
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	$ 155,977	$ 141,338
Tier I Capital to Risk-Weighted Assets, Actual Capital, Ratio	9.83%	10.39%
Tier I Capital to Risk-Weighted Assets, For Capital Adequacy Purposes, Amount	$ 95,159	$ 81,641
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	$ 155,977	$ 141,338
Tier I Capital to Average Assets, Actual Capital, Ratio	8.59%	9.06%
Tier I Capital to Average Assets, For Capital Adequacy Purposes, Amount	$ 72,663	$ 62,415
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, 2017
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Percentage of higher risk weight	150.00%
Risk weight of marketable equity securities	300.00%
Common equity Tier I capital conservation buffer	2.50%
Required minimum conservation buffer on January 1, 2016	0.625%
Required minimum conservation buffer on January 1, 2017	1.25%
Required minimum conservation buffer on January 1, 2018	1.875%
Required minimum conservation buffer on January 1, 2019	2.50%
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%
Tier 1 capital to risk-weighted assets requirement	4.00%
Total capital to risk-weighted assets requirement	8.00%
Percentage of capital ratio	1.00%
Maximum
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Tier 1 capital to risk-weighted assets requirement	6.00%
Percentage of capital ratio	2.00%

Related Party Transactions - Ch

Related Party Transactions - Changes in loans outstanding (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Loans and Leases Receivable, Related Parties [Roll Forward]
Balance, beginning of year	$ 22,471	$ 12,891
Additional loans	3,082	9,722
Repayments and changes in status	(4,832)	(142)
Balance, end of year	$ 20,721	$ 22,471

Related Party Transactions (Det

Related Party Transactions (Detail Textuals) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Related Party Transaction [Line Items]
Related party deposits	$ 45,400	$ 40,400
Payment to related parties for services	133	$ 28
Annual lease payments	$ 534
Minimum
Related Party Transaction [Line Items]
Equity ownership percentage	10.00%

Parent Corporation Only Fina117

Parent Corporation Only Financial Statements - Condensed Statements of Financial Condition (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
ASSETS
Cash and due from banks	$ 70,545	$ 96,026
Premises and equipment, net	18,196	17,835
Deferred income taxes, net	4,904	9,085
Other assets	10,448	7,174
Total assets	1,796,607	1,628,919
LIABILITIES AND SHAREHOLDERS' EQUITY
Accrued expenses and other liabilities	13,072	8,936
Stockholders' equity	161,027	145,895	$ 131,769	$ 129,210
Total liabilities and stockholders' equity	1,796,607	1,628,919
Parent Company
ASSETS
Cash and due from banks	2,494	5,677
Investment in subsidiary	178,778	162,162
Premises and equipment, net	17	55
Deferred income taxes, net	53	3,063
Other assets	9,068	3,889
Total assets	190,410	174,846
LIABILITIES AND SHAREHOLDERS' EQUITY
Subordinated debentures	25,103	25,051
Accrued expenses and other liabilities	4,280	3,900
Stockholders' equity	161,027	145,895
Total liabilities and stockholders' equity	$ 190,410	$ 174,846

Parent Corporation Only Fina118

Parent Corporation Only Financial Statements - Condensed Statements of Income (Details 1) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Condensed Financial Statements, Captions [Line Items]
Interest income									$ 66,841	$ 58,077	$ 48,692
Loss before equity in undistributed earnings of subsidiaries	$ 7,371	$ 6,158	$ 6,163	$ 5,437	$ 5,173	$ 4,577	$ 4,216	$ 4,344	25,129	18,310	13,871
Net Income	$ 2,096	$ 4,263	$ 3,769	$ 3,702	$ 3,323	$ 3,140	$ 2,896	$ 2,991	13,830	12,350	9,030
Parent Company
Condensed Financial Statements, Captions [Line Items]
Interest income									13	23	38
Other income									0	0	0
Total income									13	23	38
Expenses									2,295	3,444	2,714
Loss before equity in undistributed earnings of subsidiaries									(2,282)	(3,421)	(2,676)
Equity in undistributed earnings of subsidiaries									16,112	15,771	11,706
Net Income									$ 13,830	$ 12,350	$ 9,030

Parent Corporation Only Fina119

Parent Corporation Only Financial Statements - Condensed Statements of Cash Flows (Details 2) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Cash flows from operating activities
Net income	$ 2,096	$ 4,263	$ 3,769	$ 3,702	$ 3,323	$ 3,140	$ 2,896	$ 2,991	$ 13,830	$ 12,350	$ 9,030
Adjustments to reconcile net income to net cash used by operating activities:
Increase in other assets									(1,740)	(3,006)	(519)
Amortization of debt issuance costs									52	51
Net cash used by operating activities									20,572	17,372	13,148
Cash flows from investing activities
Net cash provided by (used by) investing activities									194,462	291,693	193,546
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 & warrants									1,368	1,106	501
Dividends paid on common stock									(2,149)	(1,661)	(376)
Dividends paid on preferred stock											(125)
Net tax benefit related to stock-based compensation										280
Net cash (used by) provided by financing activities									148,266	282,079	220,436
Net decrease in cash and cash equivalents									(25,624)	7,758	40,038
Cash and cash equivalents:
Beginning of year				96,355				88,597	96,355	88,597	48,559
End of year					96,355					96,355	88,597
Cash paid for:
Interest									16,582	11,793	7,544
Income taxes									8,020	8,584	6,136
Parent Company
Cash flows from operating activities
Net income									13,830	12,350	9,030
Adjustments to reconcile net income to net cash used by operating activities:
Equity in undistributed earnings									(16,112)	(15,771)	(11,706)
Increase in other assets									(5,179)	(1,828)	(418)
Decrease (Increase) in deferred income taxes, net									3,010	2,385	(2,192)
Increase in other liabilities									380	1,620	421
Stock-based compensation									917	1,188	1,033
Amortization of debt issuance costs									52	51	0
Net cash used by operating activities									(3,102)	(5)	(3,832)
Cash flows from investing activities
Capital contribution to Bankwell Bank									0	0	(15,000)
Decrease in premises and equipment, net									37	65	84
Net cash provided by (used by) investing activities									37	65	(14,916)
Cash flows from financing activities
Proceeds from issuance of subordinated debt									0	0	25,000
Redemption of SBLF Preferred Stock									0	0	(10,980)
Proceeds from exercise of options & warrants									2,031	1,106	501
Dividends paid on common stock									(2,149)	(1,661)	(376)
Dividends paid on preferred stock									0	0	(125)
Proceeds from issuance of common stock									0	200	3,780
Net tax benefit related to stock-based compensation									0	280	0
Net cash (used by) provided by financing activities									(118)	(75)	17,800
Net decrease in cash and cash equivalents									(3,183)	(15)	(948)
Cash and cash equivalents:
Beginning of year				$ 5,677				$ 5,692	5,677	5,692	6,640
End of year	$ 2,494				$ 5,677				2,494	5,677	5,692
Cash paid for:
Interest									0	0	0
Income taxes									$ 0	$ 0	$ 0

Quarterly Financial Informat120

Quarterly Financial Information of Bankwell Financial Group, Inc. (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Quarterly Financial Information Disclosure [Abstract]
Total interest income	$ 18,729	$ 18,348	$ 17,688	$ 16,436	$ 16,642	$ 15,633	$ 14,711	$ 14,004	$ 71,201	$ 60,990	$ 50,754
Total interest expense	4,815	4,487	4,047	3,488	3,354	3,106	2,832	2,606	16,837	11,898	7,966
Net interest income	13,914	13,861	13,641	12,948	13,288	12,527	11,879	11,398	54,364	49,092	42,788
(Credit) Provision for loan losses	(495)	398	895	543	748	1,219	1,301	646	1,341	3,914	3,230
Non-interest income	1,541	824	998	1,266	401	750	853	672	4,629	2,676	3,484
Non-interest expense	8,579	8,129	7,581	8,234	7,768	7,481	7,215	7,080	32,523	29,544	29,171
Income before income taxes	7,371	6,158	6,163	5,437	5,173	4,577	4,216	4,344	25,129	18,310	13,871
Provision from income taxes	5,275	1,895	2,394	1,735	1,850	1,437	1,320	1,353	11,299	5,960	4,841
Net income	2,096	4,263	3,769	3,702	3,323	3,140	2,896	2,991	13,830	12,350	9,030
Net income attributable to common stockholders	$ 2,096	$ 4,263	$ 3,769	$ 3,702	$ 3,323	$ 3,140	$ 2,896	$ 2,991	$ 13,830	$ 12,350	$ 8,905
Earnings per share:
Basic (in dollars per share)	$ 0.27	$ 0.55	$ 0.49	$ 0.49	$ 0.44	$ 0.42	$ 0.38	$ 0.4	$ 1.80	$ 1.64	$ 1.23
Diluted (in dollars per share)	$ 0.27	$ 0.55	$ 0.49	$ 0.48	$ 0.43	$ 0.41	$ 0.38	$ 0.4	$ 1.78	$ 1.62	$ 1.21

Quarterly Financial Informat121

Quarterly Financial Information of Bankwell Financial Group, Inc. (Unaudited) (Detail Textuals) $ in Millions	12 Months Ended
	Dec. 31, 2017USD ($)
Quarterly Financial Information Disclosure [Abstract]
Allowance for loan losses pretax reduction in the reserve	$ 1.3
Statutory federal income tax rate	35.00%
Corporate income tax rate effective in 2018	21.00%
Write-down of deferred tax asset due to tax law changes	$ 3.3