The First Bancorp, Inc. (FNLC) 10-K 8 Mar 19 2018 FY Annual report Financial data

Document and Entity Information

Document and Entity Information - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Mar. 01, 2019	Jun. 30, 2018
Document and Entity Information [Abstract]
Entity Registrant Name	First Bancorp, Inc /ME/
Entity Central Index Key	765,207
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Filer Category	Accelerated Filer
Entity Public Float			$ 286,373
Entity Common Stock, Shares Outstanding		10,883,771
Document Fiscal Year Focus	2,018
Document Fiscal Period Focus	FY
Document Type	10-K
Amendment Flag	false
Document Period End Date	Dec. 31, 2018
Entity Emerging Growth Company	false
Entity Small Business	false
Entity Shell Company	false

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Assets
Cash and cash equivalents	$ 19,134	$ 19,207
Interest-bearing deposits in other banks	12,079	860
Securities available for sale	317,416
Securities available for sale		297,199
Securities to be held to maturity (fair value of $250,900,000 at December 31, 2018, and $259,655,000 at December 31, 2017)	255,663	256,567
Restricted equity securities, at cost	11,586	10,358
Loans held for sale	0	386
Loans	1,238,283	1,164,139
Less allowance for loan losses	11,232	10,729
Net loans	1,227,051	1,153,410
Accrued interest receivable	6,660	5,867
Premises and equipment, net	22,056	22,502
Other real estate owned	584	1,012
Goodwill	29,805	29,805
Other assets	42,536	45,757
Total assets	1,944,570	1,842,930
Liabilities
Demand deposits	163,575	145,332
NOW deposits	382,923	318,043
Money market deposits	152,043	163,898
Savings deposits	237,135	232,605
Certificates of deposit	591,409	559,001
Total deposits	1,527,085	1,418,879
Borrowed funds – short term	145,205	113,638
Borrowed funds – long term	65,112	115,120
Other liabilities	15,626	13,972
Total liabilities	1,753,028	1,661,609
Commitments and contingent liabilities
Shareholders' equity
Common stock, one cent par value per share	109	108
Additional paid-in capital	62,746	61,747
Retained earnings	132,460	121,144
Accumulated other comprehensive income (loss)
Net unrealized loss on securities available for sale	(5,051)	(2,901)
Net unrealized loss on securities transferred from available for sale to held to maturity	(197)	(174)
Net unrealized gain on cash flow hedging derivative instruments	1,438	1,544
Net unrecognized gain (loss) on postretirement benefit costs	37	(147)
Total shareholders' equity	191,542	181,321
Total liabilities and shareholders' equity	$ 1,944,570	$ 1,842,930
Common stock
Number of shares authorized (in shares)	18,000,000	18,000,000
Number of shares issued (in shares)	10,862,651	10,829,918
Number of shares outstanding (in shares)	10,862,651	10,829,918
Book value per common share (usd per share)	$ 17.63	$ 16.74
Tangible book value per common share (usd per share)	$ 14.87	$ 13.97

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Assets
Securities to be held to maturity, fair value	$ 250,900	$ 259,655
Common stock, par value (usd per share)	$ 0.01	$ 0.01

Consolidated Statements of Inco

Consolidated Statements of Income and Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Interest and dividend income
Interest and fees on loans (includes tax-exempt income of $1,157,000 in 2018, $798,000 in 2017, and $670,000 in 2016)	$ 53,548	$ 45,373	$ 39,996
Interest on deposits with other banks	242	52	22
Interest and dividends on investments (includes tax-exempt income of $6,954,000 in 2018, $6,501,000 in 2017, and $5,168,000 in 2016)	16,753	15,407	13,741
Total interest and dividend income	70,543	60,832	53,759
Interest expense
Interest on deposits	15,970	9,479	6,028
Interest on borrowed funds	4,364	4,050	4,784
Total interest expense	20,334	13,529	10,812
Net interest income	50,209	47,303	42,947
Provision for loan losses	1,500	2,000	1,600
Net interest income after provision for loan losses	48,709	45,303	41,347
Non-interest income
Net securities gains	137	471	673
Other operating income	5,674	5,463	4,986
Total non-interest income	12,600	12,548	12,499
Non-interest expense
Salaries and employee benefits	17,641	16,601	15,215
Occupancy expense	2,435	2,400	2,313
Furniture and equipment expense	3,924	3,681	3,305
FDIC insurance premiums	1,226	1,008	789
Amortization of identified intangibles	43	43	43
Other operating expense	8,198	7,918	7,718
Total non-interest expense	33,467	31,651	29,383
Income before income taxes	27,842	26,200	24,463
Applicable tax expense	4,306	6,612	6,454
Net income	$ 23,536	$ 19,588	$ 18,009
Basic earnings per common share (in usd per share)	$ 2.18	$ 1.82	$ 1.68
Diluted earnings per common share (in usd per share)	$ 2.17	$ 1.81	$ 1.66
Other comprehensive income (loss), net of tax
Net unrealized loss on securities available for sale	$ (2,150)	$ (1,452)	$ (2,058)
Net unrealized loss on securities transferred from available for sale to held to maturity, net of amortization	(23)	(14)	(17)
Net unrealized gain (loss) on cash flow hedging derivative instruments	(106)	107	1,163
Net unrecognized gain (loss) on postretirement benefits	184	(19)	54
Other comprehensive loss	(2,095)	(1,378)	(858)
Comprehensive income	21,441	18,210	17,151
Fiduciary and investment management income
Non-interest income
Non-interest income	3,030	2,680	2,411
Service charges on deposit accounts
Non-interest income
Non-interest income	2,194	2,081	2,237
Mortgage origination and servicing income
Non-interest income
Non-interest income	$ 1,565	$ 1,853	$ 2,192

Consolidated Statements of In_2

Consolidated Statements of Income and Comprehensive Income (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Statement [Abstract]
Interest and fees on loans (tax-exempt income)	$ 1,157	$ 798	$ 670
Interest and dividends on investments (tax-exempt income)	$ 6,954	$ 6,501	$ 5,168

Consolidated Statements of Chan

Consolidated Statements of Changes in Shareholders' Equity - USD ($) $ in Thousands	Total	Common stock and additional paid-in capital	Retained earnings	Accumulated other comprehensive income (loss)	Warrants	WarrantsRetained earnings
Balance at Dec. 31, 2015	$ 167,498	$ 59,970	$ 106,673	$ 855
Balance (in shares) at Dec. 31, 2015		10,753,855
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	18,009		18,009
Net unrealized gain (loss) on securities available for sale, net of tax	(2,058)			(2,058)
Net unrealized gain on cash flow hedging derivate instruments, net of tax	1,163			1,163
Net unrealized loss on securities transferred from available for sale to held to maturity, net of tax	(17)			(17)
Unrecognized gain (loss) for post-retirement benefits, net of tax	54			54
Comprehensive income (loss)	17,151		18,009	(858)
Cash dividends declared	(11,110)		(11,110)
Equity compensation expense	298	$ 298
Payment for repurchase of common stock and warrants	(129)		(129)		$ (1,750)	$ (1,750)
Payment for repurchase of common stock (in shares)		(7,156)
Tax benefit from vesting of restricted stock	32	$ 32
Issuance of restricted stock	0
Issuance of restricted stock (in shares)		21,847
Proceeds from sale of common stock	531	$ 531
Proceeds from sale of common stock (in shares)		25,400
Balance at Dec. 31, 2016	172,521	$ 60,831	111,693	(3)
Balance (in shares) at Dec. 31, 2016		10,793,946
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	4,637
Net unrealized gain (loss) on securities available for sale, net of tax	1
Net unrealized loss on securities transferred from available for sale to held to maturity, net of tax	(4)
Balance at Mar. 31, 2017	174,910
Balance at Dec. 31, 2016	172,521	$ 60,831	111,693	(3)
Balance (in shares) at Dec. 31, 2016		10,793,946
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	19,588		19,588
Net unrealized gain (loss) on securities available for sale, net of tax	(1,452)			(1,452)
Net unrealized gain on cash flow hedging derivate instruments, net of tax	107			107
Net unrealized loss on securities transferred from available for sale to held to maturity, net of tax	(14)			(14)
Unrecognized gain (loss) for post-retirement benefits, net of tax	(19)			(19)
Comprehensive income (loss)	18,210		19,588	(1,378)
Cash dividends declared	(10,280)		(10,280)
Equity compensation expense	392	$ 392
Payment for repurchase of common stock and warrants	(154)		(154)
Payment for repurchase of common stock (in shares)		(5,562)
Reclassification adjustment for effect of enacted tax law changes	0		297	(297)
Issuance of restricted stock	0
Issuance of restricted stock (in shares)		18,850
Proceeds from sale of common stock	632	$ 632
Proceeds from sale of common stock (in shares)		22,684
Balance at Dec. 31, 2017	$ 181,321	$ 61,855	121,144	(1,678)
Balance (in shares) at Dec. 31, 2017	10,829,918	10,829,918
Balance at Mar. 31, 2017	$ 174,910
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	4,883
Net unrealized gain (loss) on securities available for sale, net of tax	349
Net unrealized loss on securities transferred from available for sale to held to maturity, net of tax	(4)
Balance at Jun. 30, 2017	177,537
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	4,982
Net unrealized gain (loss) on securities available for sale, net of tax	(240)
Net unrealized loss on securities transferred from available for sale to held to maturity, net of tax	(3)
Balance at Sep. 30, 2017	179,882
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	5,086
Net unrealized gain (loss) on securities available for sale, net of tax	(1,562)
Net unrealized loss on securities transferred from available for sale to held to maturity, net of tax	(3)
Balance at Dec. 31, 2017	$ 181,321	$ 61,855	121,144	(1,678)
Balance (in shares) at Dec. 31, 2017	10,829,918	10,829,918
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	$ 5,506
Net unrealized gain (loss) on securities available for sale, net of tax	(3,309)
Net unrealized loss on securities transferred from available for sale to held to maturity, net of tax	(8)
Balance at Mar. 31, 2018	181,372
Balance at Dec. 31, 2017	$ 181,321	$ 61,855	121,144	(1,678)
Balance (in shares) at Dec. 31, 2017	10,829,918	10,829,918
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	$ 23,536		23,536
Net unrealized gain (loss) on securities available for sale, net of tax	(2,150)			(2,150)
Net unrealized gain on cash flow hedging derivate instruments, net of tax	(106)			(106)
Net unrealized loss on securities transferred from available for sale to held to maturity, net of tax	(23)			(23)
Unrecognized gain (loss) for post-retirement benefits, net of tax	184			184
Comprehensive income (loss)	21,441		23,536	(2,095)
Cash dividends declared	(12,052)		(12,052)
Equity compensation expense	381	$ 381
Payment for repurchase of common stock and warrants	(168)		(168)
Payment for repurchase of common stock (in shares)		(5,725)
Issuance of restricted stock	0
Issuance of restricted stock (in shares)		16,795
Proceeds from sale of common stock	619	$ 619
Proceeds from sale of common stock (in shares)		21,663
Balance at Dec. 31, 2018	$ 191,542	$ 62,855	132,460	(3,773)
Balance (in shares) at Dec. 31, 2018	10,862,651	10,862,651
Balance at Mar. 31, 2018	$ 181,372
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	5,734
Net unrealized gain (loss) on securities available for sale, net of tax	(1,035)
Net unrealized loss on securities transferred from available for sale to held to maturity, net of tax	(7)
Balance at Jun. 30, 2018	183,304
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	5,933
Net unrealized gain (loss) on securities available for sale, net of tax	(1,888)
Net unrealized loss on securities transferred from available for sale to held to maturity, net of tax	(5)
Balance at Sep. 30, 2018	184,661
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	6,363
Net unrealized gain (loss) on securities available for sale, net of tax	4,082
Net unrealized loss on securities transferred from available for sale to held to maturity, net of tax	(3)
Balance at Dec. 31, 2018	$ 191,542	$ 62,855	$ 132,460	$ (3,773)
Balance (in shares) at Dec. 31, 2018	10,862,651	10,862,651

Consolidated Statements of Ch_2

Consolidated Statements of Changes in Shareholders' Equity (Parenthetical) - $ / shares	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Statement of Stockholders' Equity [Abstract]
Cash dividends declared, per share (USD per share)	$ 1.11	$ 0.95	$ 1.03

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Statement of Cash Flows [Abstract]
Net income	$ 23,536	$ 19,588	$ 18,009
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	1,792	1,864	1,745
Change in deferred taxes	(485)	2,083	(139)
Provision for loan losses	1,500	2,000	1,600
Loans originated for resale	(25,447)	(39,039)	(54,257)
Proceeds from sales and transfers of loans	26,323	40,172	55,035
Net gain on sales of loans	(490)	(737)	(1,211)
Net gain on sale or call of securities	(137)	(471)	(673)
Net amortization of investment premiums	1,820	3,212	2,338
Net gain on sale of other real estate owned	(312)	(84)	(177)
Provision for losses on other real estate owned	0	17	132
Equity compensation expense	381	392	298
Tax benefit from vesting of restricted stock	0	0	32
Net (increase) decrease in other assets and accrued interest	1,146	(4,817)	(2,444)
Net increase (decrease) in other liabilities	3,848	(2,020)	665
Net (gain) loss on disposal of premises and equipment	136	(108)	0
Amortization of investments in limited partnerships	186	178	194
Net acquisition amortization	43	43	43
Net cash provided by operating activities	33,840	22,273	21,190
Cash flows from investing activities
(Increase) decrease in interest-bearing deposits in other banks	(11,219)	(567)	3,720
Proceeds from sales of securities available for sale	459	15,587	10,309
Proceeds from maturities, payments, calls of securities available for sale	51,752	156,969	79,217
Proceeds from maturities, payments, calls of securities held to maturity	14,094	14,770	88,899
Proceeds from sales of other real estate owned	1,350	607	1,786
Purchases of securities available for sale	(76,893)	(177,409)	(171,881)
Purchases of securities to be held to maturity	(13,159)	(44,334)	(75,573)
Purchase of Federal Home Loan Bank Stock	(1,228)	0	0
Redemption of restricted equity securities	0	1,572	2,327
Net increase in loans	(75,751)	(95,199)	(84,850)
Capital expenditures	(1,484)	(2,529)	(2,131)
Proceeds from sale of premises and equipment	2	473	0
Net cash used in investing activities	(112,077)	(130,060)	(148,177)
Cash flows from financing activities
Net increase in demand, savings, and money market accounts	75,798	88,372	94,130
Net increase in certificates of deposit	32,408	82,381	105,638
Advances on long-term borrowings	0	50,000	35,000
Repayment on long-term borrowings	(80,000)	(70,000)	(30,000)
Net increase (decrease) in short-term borrowings	61,559	(30,143)	(63,556)
Payment to repurchase common stock	(168)	(154)	(129)
Proceeds from sale of common stock	619	632	531
Repurchase of warrants	0	0	(1,750)
Dividends paid	(12,052)	(11,460)	(9,810)
Net cash provided by financing activities	78,164	109,628	130,054
Net increase (decrease) in cash and cash equivalents	(73)	1,841	3,067
Cash and cash equivalents at beginning of year	19,207	17,366	14,299
Cash and cash equivalents at end of year	19,134	19,207	17,366
Interest paid	20,104	13,366	10,767
Income taxes paid	3,057	5,730	6,367
Non-cash transactions:
Net transfer from loans to other real estate owned	$ 610	$ 1,177	$ 584

Summary of Significant Accounti

Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2018
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	Summary of Significant Accounting Policies Principles of Consolidation The consolidated financial statements include the accounts of the Company and the Bank. All intercompany accounts and transactions have been eliminated in consolidation. Subsequent Events Events occurring subsequent to December 31, 2018 have been evaluated as to their potential impact on the financial statements. Use of Estimates in Preparation of Financial Statements In preparing the financial statements in accordance with accounting principles generally accepted in the United States of America ("GAAP"), 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 balance sheet and revenues and expenses for the reporting period. Actual results could differ significantly from those estimates. Material estimates that are particularly susceptible to significant change in the near-term relate to the determination of the allowance for loan losses, goodwill, the valuation of mortgage servicing rights, and other-than-temporary impairment of securities. Investment Securities Investment securities are classified as available for sale or held to maturity when purchased. There are no trading account securities. Securities available for sale consist primarily of debt securities which Management intends to hold for indefinite periods of time. They may be used as part of the Bank's funds management strategy, and may be sold in response to changes in interest rates or prepayment risk, changes in liquidity needs, or for other reasons. They are accounted for at fair value, with unrealized gains or losses adjusted through shareholders' equity, net of related income taxes. The cost basis is adjusted for the amortization of premiums and accretion of discounts, computed using the effective interest method over the securities' contractual lives. Securities to be held to maturity consist primarily of debt securities which Management has acquired solely for long-term investment purposes, rather than for purposes of trading or future sale. For securities to be held to maturity, Management has the intent and the Bank has the ability to hold such securities until their respective maturity dates. Such securities are carried at cost adjusted for the amortization of premiums and accretion of discounts, computed using the effective interest method over the securities' contractual lives. Investment securities transactions are accounted for on a settlement date basis; reported amounts would not be materially different from those accounted for on a trade date basis. Gains and losses on the sales of investment securities are determined using the amortized cost of the specifically identified security. For declines in the fair value of individual debt securities available for sale below their cost that are deemed to be other than temporary, where the Bank does not intend to sell the security and it is more likely than not that the Bank will not be required to sell the security before recovery of its amortized cost basis, the other-than-temporary decline in the fair value of the debt security related to 1) credit loss is recognized in earnings and 2) other factors is recognized in other comprehensive income or loss. Credit loss is deemed to exist if the present value of expected future cash flows using the effective rate at acquisition is less than the amortized cost basis of the debt security. For individual debt securities where the Bank intends to sell the security or more likely than not will be required to sell the security before recovery of its amortized cost, the other-than-temporary impairment is recognized in earnings equal to the entire difference between the security's cost basis and its fair value at the balance sheet date. Derivative Financial Instruments Designated as Hedges The Company recognizes all derivatives in the consolidated balance sheets at fair value. On the date the Bank enters into the derivative contract, the Company designates the derivative as a hedge of either a forecasted transaction or the variability of cash flows to be received or paid related to a recognized asset or liability (“cash flow hedge”), a hedge of the fair value of a recognized asset or liability or of an unrecognized firm commitment (“fair value hedge”), or a held for trading instrument (“trading instrument”). The Bank formally documents relationships between hedging instruments and hedged items, as well as its risk management objectives and strategy for undertaking various hedge transactions. The Company also assesses, both at the hedge’s inception and on an ongoing basis, whether the derivatives that are used in hedging transactions are effective in offsetting changes in cash flows or fair values of hedged items. Changes in fair value of a derivative that is effective and that qualifies as a cash flow hedge are recorded in other comprehensive income (loss) and are reclassified into earnings when the forecasted transaction or related cash flows affect earnings. Changes in fair value of a derivative that qualifies as a fair value hedge and the change in fair value of the hedged item are both recorded in earnings and offset each other when the transaction is effective. Those derivatives that are classified as trading instruments are recorded at fair value with changes in fair value recorded in earnings. The Company discontinues hedge accounting when it determines that the derivative is no longer effective in offsetting changes in the cash flows of the hedged item, that it is unlikely that the forecasted transaction will occur, or that the designation of the derivative as a hedging instrument is no longer appropriate. Loans Held for Sale Loans held for sale consist of residential real estate mortgage loans and are carried at the lower of aggregate cost or fair value, as determined by current investor yield requirements. Loans Loans are generally reported at their outstanding principal balances, adjusted for chargeoffs, the allowance for loan losses and any deferred fees or costs to originate loans. Loan commitments are recorded when funded. Loan Fees and Costs Loan origination fees and certain direct loan origination costs are deferred and recognized in interest income as an adjustment to the loan yield over the life of the related loans. The unamortized net deferred fees and costs are included on the balance sheets with the related loan balances, and the amortization is included with the related interest income. Allowance for Loan Losses Loans considered to be uncollectible are charged against the allowance for loan losses. The allowance for loan losses is maintained at a level determined by Management to be appropriate to absorb probable losses. This allowance is increased by provisions charged to operating expenses and recoveries on loans previously charged off. Arriving at an appropriate level of allowance for loan losses necessarily involves a high degree of judgment. In determining the appropriate level of allowance for loan losses, Management takes into consideration several factors, including reviews of individual non-performing loans and performing loans listed on the watch report requiring periodic evaluation, loan portfolio size by category, recent loss experience, delinquency trends and current economic conditions. For all loan classes, loans over 30 days past due are considered delinquent. Impaired loans include restructured loans and loans placed on non-accrual status when, based on current information and events, it is probable that the Bank will be unable to collect all amounts due according to the contractual terms of the loan agreement. These loans are measured at the present value of expected future cash flows discounted at the loan's effective interest rate or at the fair value of the collateral if the loan is collateral dependent. Management takes into consideration impaired loans in addition to the above mentioned factors in determining the appropriate level of allowance for loan losses. Troubled Debt Restructured A troubled debt restructured ("TDR") constitutes a restructuring of debt if the Bank, for economic or legal reasons related to the borrower's financial difficulties, grants a concession to the borrower that it would not otherwise consider. To determine whether or not a loan should be classified as a TDR, Management evaluates a loan to first determine if the borrower demonstrates financial difficulty. Common indicators of this include past due status with bank obligations, substandard credit bureau reports, or an inability to refinance with another lender. If the borrower is experiencing financial difficulty and concessions are granted, such as maturity date extension, interest rate adjustments to below market pricing, or a deferral of payments, the loan will generally be classified as a TDR. Accrual of Interest Income and Expense Interest on loans and investment securities is taken into income using methods which relate the income earned to the balances of loans and investment securities outstanding. Interest expense on liabilities is derived by applying applicable interest rates to principal amounts outstanding. For all classes of loans, recording of interest income on problem loans, which includes impaired loans, ceases when collectibility of principal and interest within a reasonable period of time becomes doubtful. Cash payments received on non-accrual loans, which includes impaired loans, are applied to reduce the loan's principal balance until the remaining principal balance is deemed collectible, after which interest is recognized when collected. As a general rule, a loan may be restored to accrual status when payments are current for a substantial period of time, generally six months, and repayment of the remaining contractual amounts is expected or when it otherwise becomes well secured and in the process of collection. Premises and Equipment Premises, furniture and equipment are stated at cost, less accumulated depreciation. Depreciation expense is computed by straight-line methods over the asset's estimated useful life. Other Real Estate Owned ("OREO") Real estate acquired by foreclosure or deed in lieu of foreclosure is transferred to OREO and recorded at fair value, less estimated costs to sell, based on appraised value at the date actually or constructively received. Loan losses arising from the acquisition of such property are charged against the allowance for loan losses. Subsequent provisions to reduce the carrying value of a property are recorded to the allowance for OREO losses and a charge to operations on a property specific basis. Goodwill and Identified Intangible Assets Intangible assets include the excess of the purchase price over the fair value of net assets acquired (goodwill) from the acquisition of FNB Bankshares in 2005 as well as the core deposit intangible related to the same acquisition. The core deposit intangible related to this acquisition was fully amortized in 2015. Intangible assets also include the goodwill and core deposit intangible from the 2012 acquisition of a bank branch in Rockland, Maine and a bank building in Bangor, Maine. The core deposit intangible will be amortized on a straight-line basis over ten years . Annual amortization expense for each of 2018 , 2017 and 2016 was $43,000 , and the amortization expense for each year until fully amortized (presently expected to be 2022) will be $43,000 . The straight-line basis is used because the Company does not expect significant run off in the core deposits acquired. The Company annually evaluates goodwill, and periodically evaluates other intangible assets, for impairment. At December 31, 2018 , the Company determined goodwill and other intangible assets were not impaired. Income Taxes Deferred tax assets and liabilities are recognized for the future tax consequences attributable to differences between financial statement carrying amounts of assets and liabilities and their respective tax bases, and for tax credits that are available to offset future taxable income. 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 of a change in tax rates on deferred tax assets and liabilities is recognized in income in the period the change is enacted. On December 22, 2017 the Tax Cuts and Jobs Act of 2017 ("TCJA") was enacted. One facet of TCJA reduced the federal corporate income tax rate from 35% to 21% effective January 1, 2018. As a result of this legislation, the Company evaluated its deferred tax assets and deferred tax liabilities. The effect of the new corporate income tax rate reduced the value of our net tax deferred assets by $134,000 , and a charge to earnings was recorded for this amount in the fourth quarter of 2017. Loan Servicing Servicing rights are recognized when they are acquired through sale of loans. Capitalized servicing rights are reported in other assets and are amortized into non-interest income in proportion to, and over the period of, the estimated future net servicing income of the underlying financial assets. Servicing rights are evaluated for impairment based upon the fair value of the rights as compared to amortized cost. Impairment is determined by stratifying rights by predominant characteristics, such as interest rates and terms. Impairment is recognized through a valuation allowance for an individual stratum, to the extent that fair value is less than the capitalized amount for the stratum. Post-Retirement Benefits The cost of providing post-retirement benefits is accrued during the active service period of the employee or director. Earnings Per Share Basic earnings per share data are based on the weighted average number of common shares outstanding during each year. Diluted earnings per share gives effect to restricted stock granted and stock options and warrants outstanding, determined by the treasury stock method. Comprehensive Income (Loss) Comprehensive income (loss) includes net income and other comprehensive income (loss), which is comprised of the change in unrealized gains and losses on securities available for sale, net of tax, change in unrealized losses on securities transferred from available for sale to held to maturity, net of amortization, change in unrealized gain on cash flow hedging derivative instruments, net of tax, and unrecognized gains and losses related to post-retirement benefit costs, net of tax. Segments The First Bancorp, Inc., through the branches of its subsidiary, First National Bank, provides a broad range of financial services to individuals and companies in coastal Maine. These services include demand, time, and savings deposits; lending; ATM processing; and investment management and trust services. Operations are managed and financial performance is evaluated on a corporate-wide basis. Accordingly, all of the Company's banking operations are considered by Management to be aggregated in one

Cash and Cash Equivalents

Cash and Cash Equivalents	12 Months Ended
	Dec. 31, 2018
Cash and Cash Equivalents [Abstract]
Cash and Cash Equivalents	Cash and Cash Equivalents For the purposes of reporting consolidated cash flows, cash and cash equivalents include cash on hand, amounts due from banks and federal funds sold. At December 31, 2018 , the Company had a contractual clearing balance of $500,000 and a reserve balance requirement of $2,359,000

Investment Securities

Investment Securities	12 Months Ended
	Dec. 31, 2018
Investments, Debt and Equity Securities [Abstract]
Investment Securities	Investment Securities The following tables summarize the amortized cost and estimated fair value of investment securities at December 31, 2018 and 2017 : Amortized Unrealized Unrealized Fair Value As of December 31, 2018 Cost Gains Losses (Estimated) Securities available for sale U.S. government-sponsored agencies $ 5,000,000 $ 7,000 $ — $ 5,007,000 Mortgage-backed securities 313,854,000 571,000 (6,732,000) 307,693,000 State and political subdivisions 4,955,000 — (239,000 ) 4,716,000 $ 323,809,000 $ 578,000 $ (6,971,000 ) $ 317,416,000 Securities to be held to maturity U.S. Government-sponsored agencies $ 11,155,000 $ — $ (472,000 ) $ 10,683,000 Mortgage-backed securities 18,250,000 336,000 (255,000 ) 18,331,000 State and political subdivisions 221,958,000 1,046,000 (5,418,000 ) 217,586,000 Corporate securities 4,300,000 — — 4,300,000 $ 255,663,000 $ 1,382,000 $ (6,145,000 ) $ 250,900,000 Restricted equity securities Federal Home Loan Bank Stock $ 10,549,000 $ — $ — $ 10,549,000 Federal Reserve Bank Stock 1,037,000 — — 1,037,000 $ 11,586,000 $ — $ — $ 11,586,000 Amortized Unrealized Unrealized Fair Value As of December 31, 2017 Cost Gains Losses (Estimated) Securities available for sale Mortgage-backed securities $ 293,689,000 $ 722,000 $ (4,422,000 ) $ 289,989,000 State and political subdivisions 6,860,000 16,000 (107,000 ) 6,769,000 Other equity securities 323,000 121,000 (3,000 ) 441,000 $ 300,872,000 $ 859,000 $ (4,532,000 ) $ 297,199,000 Securities to be held to maturity U.S. Government-sponsored agencies $ 11,155,000 $ — $ (180,000 ) $ 10,975,000 Mortgage-backed securities 23,284,000 568,000 (128,000 ) 23,724,000 State and political subdivisions 217,828,000 3,931,000 (1,103,000 ) 220,656,000 Corporate securities 4,300,000 — — 4,300,000 $ 256,567,000 $ 4,499,000 $ (1,411,000 ) $ 259,655,000 Restricted equity securities Federal Home Loan Bank Stock $ 9,321,000 $ — $ — $ 9,321,000 Federal Reserve Bank Stock 1,037,000 — — 1,037,000 $ 10,358,000 $ — $ — $ 10,358,000 The following table summarizes the contractual maturities of investment securities at December 31, 2018 : Securities available for sale Securities to be held to maturity Amortized Cost Fair Value (Estimated) Amortized Cost Fair Value (Estimated) Due in 1 year or less $ — $ — $ 1,432,000 $ 1,433,000 Due in 1 to 5 years 13,501,000 13,518,000 20,717,000 20,778,000 Due in 5 to 10 years 83,954,000 83,326,000 157,544,000 155,313,000 Due after 10 years 226,354,000 220,572,000 75,970,000 73,376,000 $ 323,809,000 $ 317,416,000 $ 255,663,000 $ 250,900,000 The following table summarizes the contractual maturities of investment securities at December 31, 2017 : Securities available for sale Securities to be held to maturity Amortized Cost Fair Value (Estimated) Amortized Cost Fair Value (Estimated) Due in 1 year or less $ 111,000 $ 112,000 $ 635,000 $ 637,000 Due in 1 to 5 years 841,000 842,000 18,059,000 18,164,000 Due in 5 to 10 years 29,003,000 29,177,000 37,182,000 37,719,000 Due after 10 years 270,594,000 266,627,000 200,691,000 203,135,000 Equity securities 323,000 441,000 — — $ 300,872,000 $ 297,199,000 $ 256,567,000 $ 259,655,000 At December 31, 2018 , securities with a fair value of $222,829,000 were pledged to secure borrowings from the Federal Home Loan Bank of Boston, public deposits, repurchase agreements, and for other purposes as required by law. This compares to securities with a fair value of $231,516,000 as of December 31, 2017 pledged for the same purposes. Gains and losses on the sale of securities available for sale are computed by subtracting the amortized cost at the time of sale from the security's selling price, net of accrued interest to be received. The following table shows securities gains and losses for 2018 , 2017 and 2016 : 2018 2017 2016 Proceeds from sales of securities $ 459,000 $ 15,587,000 $ 10,309,000 Gross realized gains 137,000 471,000 673,000 Gross realized losses — — — Net gain $ 137,000 $ 471,000 $ 673,000 Related income taxes $ 29,000 $ 165,000 $ 236,000 All equity securities were sold during 2018. Management reviews securities with unrealized losses for other than temporary impairment. As of December 31, 2018 , there were 511 securities with unrealized losses held in the Company's portfolio. These securities were temporarily impaired as a result of changes in interest rates reducing their fair value, of which 232 had been temporarily impaired for 12 months or more. At the present time, there have been no material changes in the credit quality of these securities resulting in other than temporary impairment, and in Management's opinion, no additional write-down for other-than-temporary impairment is warranted. Information regarding securities temporarily impaired as of December 31, 2018 is summarized below: Less than 12 months 12 months or more Total Fair Unrealized Fair Unrealized Fair Unrealized As of December 31, 2018 Value Losses Value Losses Value Losses U.S. Government-sponsored agencies $ — $ — $ 10,683,000 $ (472,000 ) $ 10,683,000 $ (472,000 ) Mortgage-backed securities 76,050,000 (1,061,000 ) 185,136,000 (5,926,000 ) 261,186,000 (6,987,000 ) State and political subdivisions 76,809,000 (1,784,000 ) 45,052,000 (3,873,000 ) 121,861,000 (5,657,000 ) $ 152,859,000 $ (2,845,000 ) $ 240,871,000 $ (10,271,000 ) $ 393,730,000 $ (13,116,000 ) As of December 31, 2017 , there were 241 securities with unrealized losses held in the Company's portfolio. These securities were temporarily impaired as a result of changes in interest rates reducing their fair value, of which 157 had been temporarily impaired for 12 months or more. Information regarding securities temporarily impaired as of December 31, 2017 is summarized below: Less than 12 months 12 months or more Total Fair Unrealized Fair Unrealized Fair Unrealized As of December 31, 2017 Value Losses Value Losses Value Losses U.S. Government-sponsored agencies $ 7,161,000 $ (94,000 ) $ 3,814,000 $ (86,000 ) $ 10,975,000 $ (180,000 ) Mortgage-backed securities 132,025,000 (1,857,000 ) 101,707,000 (2,693,000 ) 233,732,000 (4,550,000 ) State and political subdivisions 9,425,000 (149,000 ) 38,864,000 (1,061,000 ) 48,289,000 (1,210,000 ) Other equity securities — — 9,000 (3,000 ) 9,000 (3,000 ) $ 148,611,000 $ (2,100,000 ) $ 144,394,000 $ (3,843,000 ) $ 293,005,000 $ (5,943,000 ) During the third quarter of 2014, the Company transferred securities with a total amortized cost of $89,780,000 and a corresponding fair value of $89,757,000 from available for sale to held to maturity. The net unrealized loss, net of taxes, on these securities at the date of the transfer was $15,000 . The net unrealized holding loss at the time of transfer continues to be reported in accumulated other comprehensive income (loss), net of tax, and is amortized over the remaining lives of the securities as an adjustment of the yield. The amortization of the net unrealized loss reported in accumulated other comprehensive income (loss) will offset the effect on interest income of the discount for the transferred securities. The remaining unamortized balance of the net unrealized losses for the securities transferred from available for sale to held to maturity was $197,000 at December 31, 2018 . These securities were transferred as a part of the Company's overall investment and balance sheet strategies. The Bank is a member of the Federal Home Loan Bank ("FHLB") of Boston, a cooperatively owned wholesale bank for housing and finance in the six New England States. As a requirement of membership in the FHLB, the Bank must own a minimum required amount of FHLB stock, calculated periodically based primarily on its level of borrowings from the FHLB. The Bank uses the FHLB for much of its wholesale funding needs. As of December 31, 2018 and 2017 , the Bank's investment in FHLB stock totaled $10,549,000 and $9,321,000 , respectively. FHLB stock is a restricted equity security and therefore is reported at cost, which equals par value. The Company periodically evaluates its investment in FHLB stock for impairment based on, among other factors, the capital adequacy of the FHLB and its overall financial condition. No impairment losses have been recorded through December 31, 2018

Mortgage Servicing Rights

Mortgage Servicing Rights	12 Months Ended
	Dec. 31, 2018
Transfers and Servicing [Abstract]
Mortgage Servicing Rights	Mortgage Servicing Rights At December 31, 2018 and 2017 , the Bank serviced loans for others totaling $261,654,000 and $260,258,000 , respectively. Net gains from the sale of loans totaled $490,000 in 2018 , $737,000 in 2017 , and $1,211,000 in 2016 . In 2018 , mortgage servicing rights of $291,000 were capitalized and amortization for the year totaled $204,000 . At December 31, 2018 , mortgage servicing rights had a fair value of $2,586,000 . In 2017 , mortgage servicing rights of $567,000 were capitalized and amortization for the year totaled $362,000 . At December 31, 2017 , mortgage servicing rights had a fair value of $2,321,000 . Financial Accounting Standards Board ("FASB") Accounting Standards Codification (the "Codification" or "ASC") Topic 860, "Transfers and Servicing", requires all separately recognized servicing assets and servicing liabilities to be initially measured at fair value, if practicable. Servicing assets and servicing liabilities are reported using the amortization method or the fair value measurement method. In evaluating the carrying values of mortgage servicing rights, the Company obtains third party valuations based on loan level data including note rate, type and term of the underlying loans. The model utilizes several assumptions, the most significant of which are loan prepayments, calculated using a three -month moving average of weekly prepayment data published by the Public Securities Association (PSA) and modeled against the serviced loan portfolio, and the discount rate to discount future cash flows. As of December 31, 2018 , the prepayment assumption using the PSA model was 129 , which translates into an anticipated annual prepayment rate of 7.74% . The discount rate is 9.50% . Other assumptions include delinquency rates, foreclosure rates, servicing cost inflation, and annual unit loan cost. All assumptions are adjusted periodically to reflect current circumstances. Amortization of mortgage servicing rights, as well as write-offs due to prepayments of the related mortgage loans, are recorded as a charge against mortgage servicing fee income. Mortgage servicing rights are included in other assets and detailed in the following table: As of December 31, 2018 2017 Mortgage servicing rights $ 5,718,000 $ 5,428,000 Accumulated amortization (4,364,000 ) (4,160,000 ) $ 1,354,000 $ 1,268,000

Loans

Loans	12 Months Ended
	Dec. 31, 2018
Loans and Leases Receivable Disclosure [Abstract]
Loans	Loans The following table shows the composition of the Company's loan portfolio as of December 31, 2018 and 2017 : December 31, 2018 December 31, 2017 Commercial Real estate $ 353,243,000 28.5 % $ 323,809,000 27.8 % Construction 27,304,000 2.2 % 38,056,000 3.3 % Other 196,391,000 15.9 % 181,528,000 15.6 % Municipal 51,128,000 4.1 % 33,391,000 2.9 % Residential Term 469,145,000 37.9 % 432,661,000 37.1 % Construction 17,743,000 1.4 % 17,868,000 1.5 % Home equity line of credit 98,469,000 8.0 % 111,302,000 9.6 % Consumer 24,860,000 2.0 % 25,524,000 2.2 % Total loans $ 1,238,283,000 100.0 % $ 1,164,139,000 100.0 % Loan balances include net deferred loan costs of $6,615,000 in 2018 and $5,748,000 in 2017 . Pursuant to collateral agreements, qualifying first mortgage loans and commercial real estate, which totaled $290,138,000 and $239,805,000 at December 31, 2018 and 2017 , respectively, were used to collateralize borrowings from the Federal Home Loan Bank of Boston. In addition, commercial, residential construction and home equity loans totaling $237,152,000 at December 31, 2018 and $290,247,000 at December 31, 2017 were used to collateralize a standby line of credit at the Federal Reserve Bank of Boston that is currently unused. At December 31, 2018 and 2017 , non-accrual loans were $14,727,000 and $14,736,000 , respectively. For the years ended December 31, 2018 , 2017 and 2016 , interest income which would have been recognized on these loans, if interest had been accrued, was $811,000 , $496,000 , and $288,000 , respectively. Loans more than 90 days past due accruing interest totaled $351,000 at December 31, 2018 and $445,000 at December 31, 2017 . The Company continues to accrue interest on these loans because it believes collection of principal and interest is reasonably assured. Loans to directors, officers and employees totaled $34,566,000 at December 31, 2018 and $34,715,000 at December 31, 2017 . A summary of loans to directors and executive officers is as follows: For the years ended December 31, 2018 2017 Balance at beginning of year $ 22,354,000 $ 23,293,000 New loans 1,341,000 867,000 Repayments (1,192,000 ) (1,806,000 ) Retired director (354,000 ) — Balance at end of year $ 22,149,000 $ 22,354,000 Information on the past-due status of loans as of December 31, 2018 , is presented in the following table: 30-59 Days Past Due 60-89 Days Past Due 90+ Days Past Due All Past Due Current Total 90+ Days & Accruing Commercial Real estate $ 1,274,000 $ — $ 777,000 $ 2,051,000 $ 351,192,000 $ 353,243,000 $ — Construction — 10,000 — 10,000 27,294,000 27,304,000 — Other 455,000 5,000 120,000 580,000 195,811,000 196,391,000 — Municipal — — — — 51,128,000 51,128,000 — Residential Term 1,097,000 3,518,000 2,023,000 6,638,000 462,507,000 469,145,000 339,000 Construction 76,000 — — 76,000 17,667,000 17,743,000 — Home equity line of credit 2,819,000 419,000 493,000 3,731,000 94,738,000 98,469,000 — Consumer 237,000 25,000 27,000 289,000 24,571,000 24,860,000 12,000 Total $ 5,958,000 $ 3,977,000 $ 3,440,000 $ 13,375,000 $ 1,224,908,000 $ 1,238,283,000 $ 351,000 Information on the past-due status of loans as of December 31, 2017 , is presented in the following table: 30-59 Days Past Due 60-89 Days Past Due 90+ Days Past Due All Past Due Current Total 90+ Days & Accruing Commercial Real estate $ 574,000 $ 80,000 $ 220,000 $ 874,000 $ 322,935,000 $ 323,809,000 $ — Construction — — — — 38,056,000 38,056,000 — Other 542,000 6,663,000 574,000 7,779,000 173,749,000 181,528,000 — Municipal — — — — 33,391,000 33,391,000 — Residential Term 1,031,000 4,372,000 2,256,000 7,659,000 425,002,000 432,661,000 436,000 Construction 101,000 370,000 — 471,000 17,397,000 17,868,000 — Home equity line of credit 537,000 445,000 725,000 1,707,000 109,595,000 111,302,000 — Consumer 159,000 18,000 9,000 186,000 25,338,000 25,524,000 9,000 Total $ 2,944,000 $ 11,948,000 $ 3,784,000 $ 18,676,000 $ 1,145,463,000 $ 1,164,139,000 $ 445,000 For all classes, loans are placed on non-accrual status when, based on current information and events, it is probable that the Company will be unable to collect all amounts due according to the contractual terms of the loan agreement or when principal and interest is 90 days or more past due unless the loan is both well secured and in the process of collection (in which case the loan may continue to accrue interest in spite of its past due status). A loan is "well secured" if it is secured (1) by collateral in the form of liens on or pledges of real or personal property, including securities, that have a realizable value sufficient to discharge the debt (including accrued interest) in full, or (2) by the guarantee of a financially responsible party. A loan is "in the process of collection" if collection of the loan is proceeding in due course either (1) through legal action, including judgment enforcement procedures, or, (2) in appropriate circumstances, through collection efforts not involving legal action which are reasonably expected to result in repayment of the debt or in its restoration to a current status in the near future. Information on nonaccrual loans as of December 31, 2018 and 2017 is presented in the following table: As of December 31, 2018 2017 Commercial Real estate $ 1,226,000 $ 752,000 Construction — — Other 8,664,000 9,357,000 Municipal — — Residential Term 4,062,000 3,778,000 Construction — — Home equity line of credit 760,000 833,000 Consumer 15,000 16,000 Total $ 14,727,000 $ 14,736,000 Information regarding impaired loans is as follows: For the years ended December 31, 2018 2017 2016 Average investment in impaired loans $ 31,805,000 $ 29,108,000 $ 28,217,000 Interest income recognized on impaired loans, all on cash basis 864,000 784,000 1,104,000 As of December 31, 2018 2017 Balance of impaired loans $ 31,751,000 $ 31,392,000 Less portion for which no allowance for loan losses is allocated (21,030,000 ) (18,023,000 ) Portion of impaired loan balance for which an allowance for loan losses is allocated $ 10,721,000 $ 13,369,000 Portion of allowance for loan losses allocated to the impaired loan balance $ 2,308,000 $ 1,812,000 Impaired loans include restructured loans and loans placed on non-accrual. These loans are measured at the present value of expected future cash flows discounted at the loan's effective interest rate or at the fair value of the collateral if the loan is collateral dependent. If the measure of an impaired loan is lower than the recorded investment in the loan and estimated selling costs, a specific reserve is established for the difference, or, in certain situations, if the measure of an impaired loan is lower than the recorded investment in the loan and estimated selling costs, the difference is written off. A breakdown of impaired loans by category as of December 31, 2018 , is presented in the following table: Recorded Investment Unpaid Principal Balance Related Allowance Average Recorded Investment Recognized Interest Income With No Related Allowance Commercial Real estate $ 8,718,000 $ 9,161,000 $ — $ 5,536,000 $ 380,000 Construction 721,000 721,000 — 762,000 43,000 Other 1,468,000 1,555,000 — 2,037,000 32,000 Municipal — — — — — Residential Term 9,136,000 10,317,000 — 9,427,000 289,000 Construction — — — — — Home equity line of credit 972,000 1,035,000 — 1,001,000 20,000 Consumer 15,000 42,000 — 13,000 — $ 21,030,000 $ 22,831,000 $ — $ 18,776,000 $ 764,000 With an Allowance Recorded Commercial Real estate $ 1,042,000 $ 1,059,000 $ 260,000 $ 3,477,000 $ 42,000 Construction — — — — — Other 7,791,000 8,216,000 1,696,000 7,471,000 5,000 Municipal — — — — — Residential Term 1,768,000 1,998,000 335,000 1,982,000 53,000 Construction — — — — — Home equity line of credit 120,000 124,000 17,000 99,000 — Consumer — — — — — $ 10,721,000 $ 11,397,000 $ 2,308,000 $ 13,029,000 $ 100,000 Total Commercial Real estate $ 9,760,000 $ 10,220,000 $ 260,000 $ 9,013,000 $ 422,000 Construction 721,000 721,000 — 762,000 43,000 Other 9,259,000 9,771,000 1,696,000 9,508,000 37,000 Municipal — — — — — Residential Term 10,904,000 12,315,000 335,000 11,409,000 342,000 Construction — — — — — Home equity line of credit 1,092,000 1,159,000 17,000 1,100,000 20,000 Consumer 15,000 42,000 — 13,000 — $ 31,751,000 $ 34,228,000 $ 2,308,000 $ 31,805,000 $ 864,000 Substantially all interest income recognized on impaired loans for all classes of financing receivables was recognized on a cash basis as received. A breakdown of impaired loans by category as of December 31, 2017 , is presented in the following table: Recorded Investment Unpaid Principal Balance Related Allowance Average Recorded Investment Recognized Interest Income With No Related Allowance Commercial Real estate $ 3,791,000 $ 3,996,000 $ — $ 5,124,000 $ 164,000 Construction 741,000 741,000 — 62,000 38,000 Other 2,591,000 2,671,000 — 1,908,000 36,000 Municipal — — — — — Residential Term 9,769,000 10,909,000 — 10,770,000 297,000 Construction — — — — — Home equity line of credit 1,115,000 1,429,000 — 1,351,000 18,000 Consumer 16,000 29,000 — 12,000 — $ 18,023,000 $ 19,775,000 $ — $ 19,227,000 $ 553,000 With an Allowance Recorded Commercial Real estate $ 3,999,000 $ 4,116,000 $ 224,000 $ 4,460,000 $ 152,000 Construction — — — 699,000 — Other 7,327,000 7,371,000 1,309,000 2,584,000 — Municipal — — — — — Residential Term 1,979,000 2,144,000 255,000 2,106,000 79,000 Construction — — — — — Home equity line of credit 64,000 67,000 24,000 32,000 — Consumer — — — — — $ 13,369,000 $ 13,698,000 $ 1,812,000 $ 9,881,000 $ 231,000 Total Commercial Real estate $ 7,790,000 $ 8,112,000 $ 224,000 $ 9,584,000 $ 316,000 Construction 741,000 741,000 — 761,000 38,000 Other 9,918,000 10,042,000 1,309,000 4,492,000 36,000 Municipal — — — — — Residential Term 11,748,000 13,053,000 255,000 12,876,000 376,000 Construction — — — — — Home equity line of credit 1,179,000 1,496,000 24,000 1,383,000 18,000 Consumer 16,000 29,000 — 12,000 — $ 31,392,000 $ 33,473,000 $ 1,812,000 $ 29,108,000 $ 784,000 A breakdown of impaired loans by category as of December 31, 2016 , is presented in the following table: Recorded Investment Unpaid Principal Balance Related Allowance Average Recorded Investment Recognized Interest Income With No Related Allowance Commercial Real estate $ 5,201,000 $ 5,614,000 $ — $ 6,252,000 $ 220,000 Construction — — — 32,000 — Other 1,671,000 1,852,000 — 1,074,000 86,000 Municipal — — — — — Residential Term 11,483,000 12,654,000 — 11,025,000 442,000 Construction — — — — — Home equity line of credit 1,361,000 1,733,000 — 1,213,000 33,000 Consumer — — — 9,000 — $ 19,716,000 $ 21,853,000 $ — $ 19,605,000 $ 781,000 With an Allowance Recorded Commercial Real estate $ 4,820,000 $ 4,925,000 $ 505,000 $ 4,153,000 $ 186,000 Construction 763,000 763,000 100,000 816,000 36,000 Other 72,000 72,000 39,000 317,000 — Municipal — — — — — Residential Term 2,186,000 2,328,000 304,000 3,209,000 101,000 Construction — — — — — Home equity line of credit 26,000 28,000 26,000 69,000 — Consumer — — — 48,000 — $ 7,867,000 $ 8,116,000 $ 974,000 $ 8,612,000 $ 323,000 Total Commercial Real estate $ 10,021,000 $ 10,539,000 $ 505,000 $ 10,405,000 $ 406,000 Construction 763,000 763,000 100,000 848,000 36,000 Other 1,743,000 1,924,000 39,000 1,391,000 86,000 Municipal — — — — — Residential Term 13,669,000 14,982,000 304,000 14,234,000 543,000 Construction — — — — — Home equity line of credit 1,387,000 1,761,000 26,000 1,282,000 33,000 Consumer — — — 57,000 — $ 27,583,000 $ 29,969,000 $ 974,000 $ 28,217,000 $ 1,104,000 Troubled Debt Restructured A TDR constitutes a restructuring of debt if the Company, for economic or legal reasons related to the borrower's financial difficulties, grants a concession to the borrower that it would not otherwise consider. To determine whether or not a loan should be classified as a TDR, Management evaluates a loan based upon the following criteria: • The borrower demonstrates financial difficulty; common indicators include past due status with bank obligations, substandard credit bureau reports, or an inability to refinance with another lender, and • The Company has granted a concession; common concession types include maturity date extension, interest rate adjustments to below market pricing, and deferment of payments. As of December 31, 2018 , the Company had 76 loans with a value of $25,222,000 that have been classified as TDRs. This compares to 62 loans with a value of $17,801,000 classified as TDRs as of December 31, 2017 . The impairment carried as a specific reserve in the allowance for loan losses is calculated by present valuing the cashflow modification on the loan, or, for collateral-dependent loans, using the fair value of the collateral less costs to sell. The following table shows TDRs by class and the specific reserve as of December 31, 2018 : Number of Loans Balance Specific Reserves Commercial Real estate 17 $ 8,631,000 $ 132,000 Construction 1 721,000 — Other 10 7,298,000 1,276,000 Municipal — — — Residential Term 45 8,074,000 160,000 Construction — — — Home equity line of credit 3 498,000 — Consumer — — — 76 $ 25,222,000 $ 1,568,000 The following table shows TDRs by class and the specific reserve as of December 31, 2017 : Number of Loans Balance Specific Reserves Commercial Real estate 8 $ 7,038,000 $ 90,000 Construction 1 741,000 — Other 4 561,000 — Municipal — — — Residential Term 46 8,948,000 233,000 Construction — — — Home equity line of credit 3 513,000 — Consumer — — — 62 $ 17,801,000 $ 323,000 As of December 31, 2018 , nine of the loans classified as TDRs with a total balance of $1,013,000 were more than 30 days past due. None of these loans had been placed on TDR status in the previous 12 months. The following table shows past-due TDRs by class and the associated specific reserves included in the allowance for loan losses as of December 31, 2018 : Number of Loans Balance Specific Reserves Commercial Real estate — $ — $ — Construction — — — Other — — — Municipal — — — Residential Term 8 846,000 26,000 Construction — — — Home equity line of credit 1 167,000 — Consumer — — — 9 $ 1,013,000 $ 26,000 As of December 31, 2017 , 12 of the loans classified as TDRs with a total balance of $1,407,000 were more than 30 days past due. None of these loans had been placed on TDR status in the previous 12 months. The following table shows past-due TDRs by class and the associated specific reserves included in the allowance for loan losses as of December 31, 2017 : Number of Loans Balance Specific Reserves Commercial Real estate — $ — $ — Construction — — — Other — — — Municipal — — — Residential Term 11 1,240,000 44,000 Construction — — — Home equity line of credit 1 167,000 — Consumer — — — 12 $ 1,407,000 $ 44,000 For the year ended December 31, 2018 , 18 loans were place on TDR status. The following table shows these TDRs by class and the associated specific reserves included in the allowance for loan losses as of December 31, 2018: Number of Loans Pre-Modification Outstanding Recorded Investment Post-Modification Outstanding Recorded Investment Specific Reserves Commercial Real estate 9 $ 1,729,000 $ 1,727,000 42,000 Construction — — — — Other 6 7,116,000 6,798,000 1,276,000 Municipal — — — — Residential Term 3 520,000 507,000 26,000 Construction — — — — Home equity line of credit — — — — Consumer — — — — 18 $ 9,365,000 $ 9,032,000 1,344,000 No loans were placed in TDR status in 2017. As of December 31, 2018 , Management is aware of seven loans classified as TDRs that are involved in bankruptcy with an outstanding balance of $935,000 . As of December 31, 2018 , there were 17 loans with an outstanding balance of $8,197,000 that were classified as TDRs and were on non-accrual status, three of which, with an outstanding balance of $398,000 , were in the process of foreclosure. Residential Mortgage Loans in Process of Foreclosure As of December 31, 2018 , there were 11 mortgage loans collateralized by residential real estate in the process of foreclosure with a total balance of $1,131,000 ; this compares to 12 mortgage loans collateralized by residential real estate in the process of foreclosure with a total balance of $1,777,000 as of December 31, 2017 .

Allowance for Loan Losses

Allowance for Loan Losses	12 Months Ended
	Dec. 31, 2018
Receivables [Abstract]
Allowance for Loan Losses	Allowance for Loan Losses The Company provides for loan losses through the establishment of an allowance for loan losses, which represents an estimated reserve for existing losses in the loan portfolio. A systematic methodology is used for determining the allowance that includes a quarterly review process, risk rating changes, and adjustments to the allowance. Major risk characteristics relevant to each portfolio segment are as follows: Commercial Real Estate - Commercial real estate loans are impacted by factors such as competitive market forces, vacancy rates, cap rates, net operating incomes, lease renewals and overall economic demand. In addition, loans in the recreational and tourism sector can be affected by weather conditions, such as unseasonably low winter snowfalls. Commercial real estate lending also carries a higher degree of environmental risk than other real estate lending. Commercial Construction - Commercial construction loans are impacted by factors similar to those for commercial real estate loans in addition to risks related to contractor financial capacity and ability to complete a project within acceptable time frames and within budget. Commercial Other - A weakened economy, soft consumer spending, and the rising cost of labor or raw materials are examples of issues that can impact the credit quality in this segment. Municipal Loans - The overall health of the economy, including unemployment rates and housing prices, has an impact on the credit quality of this segment. Residential Real Estate Term - The overall health of the economy, including unemployment rates and housing prices, has an impact on the credit quality of this segment. Residential Real Estate Construction - The overall health of the economy, including unemployment rates and housing prices, has an impact on the credit quality of this segment. Residential construction loans are impacted by factors similar to those for residential real estate term loans in addition to risks related to contractor financial capacity and ability to complete a project within acceptable time frames and within budget. Home Equity Line of Credit - The overall health of the economy, including unemployment rates and housing prices, has an impact on the credit quality of this segment. Consumer - The overall health of the economy, including unemployment rates, has an impact on the credit quality of this segment. The appropriate level of the allowance is evaluated continually based on a review of significant loans, with a particular emphasis on nonaccruing, past due, and other loans that may require special attention. Other factors include general conditions in local and national economies; loan portfolio composition and asset quality indicators; and internal factors such as changes in underwriting policies, credit administration practices, experience, ability and depth of lending management, among others. The following table summarizes the composition of the allowance for loan losses, by class of financing receivable and allowance, as of December 31, 2018 and 2017 : As of December 31, 2018 2017 Allowance for Loans Evaluated Individually for Impairment Commercial Real estate $ 260,000 $ 224,000 Construction — — Other 1,696,000 1,309,000 Municipal — — Residential Term 335,000 255,000 Construction — — Home equity line of credit 17,000 24,000 Consumer — — Total $ 2,308,000 $ 1,812,000 Allowance for Loans Evaluated Collectively for Impairment Commercial Real estate $ 3,307,000 $ 3,648,000 Construction 255,000 434,000 Other 1,845,000 2,049,000 Municipal 24,000 20,000 Residential Term 900,000 875,000 Construction 34,000 36,000 Home equity line of credit 713,000 668,000 Consumer 630,000 545,000 Unallocated 1,216,000 642,000 Total $ 8,924,000 $ 8,917,000 Total Allowance for Loan Losses Commercial Real estate $ 3,567,000 $ 3,872,000 Construction 255,000 434,000 Other 3,541,000 3,358,000 Municipal 24,000 20,000 Residential Term 1,235,000 1,130,000 Construction 34,000 36,000 Home equity line of credit 730,000 692,000 Consumer 630,000 545,000 Unallocated 1,216,000 642,000 Total $ 11,232,000 $ 10,729,000 The allowance consists of four elements: (1) specific reserves for loans evaluated individually for impairment; (2) general reserves for each portfolio segment based on historical loan loss experience; (3) qualitative reserves judgmentally adjusted for local and national economic conditions, concentrations, portfolio composition, volume and severity of delinquencies and nonaccrual loans, trends of criticized and classified loans, changes in credit policies, and underwriting standards, credit administration practices, and other factors as applicable for each portfolio segment; and (4) unallocated reserves. All outstanding loans are considered in evaluating the appropriateness of the allowance. A breakdown of the allowance for loan losses as of December 31, 2018 and 2017 , by class of financing receivable and allowance element, is presented in the following tables: As of December 31, 2018 Specific Reserves on Loans Evaluated Individually for Impairment General Reserves on Loans Based on Historical Loss Experience Reserves for Qualitative Factors Unallocated Reserves Total Reserves Commercial Real estate $ 260,000 $ 742,000 $ 2,565,000 $ — $ 3,567,000 Construction — 57,000 198,000 — 255,000 Other 1,696,000 414,000 1,431,000 — 3,541,000 Municipal — — 24,000 — 24,000 Residential Term 335,000 326,000 574,000 — 1,235,000 Construction — 12,000 22,000 — 34,000 Home equity line of credit 17,000 263,000 450,000 — 730,000 Consumer — 271,000 359,000 — 630,000 Unallocated — — — 1,216,000 1,216,000 $ 2,308,000 $ 2,085,000 $ 5,623,000 $ 1,216,000 $ 11,232,000 As of December 31, 2017 Specific Reserves on Loans Evaluated Individually for Impairment General Reserves on Loans Based on Historical Loss Experience Reserves for Qualitative Factors Unallocated Reserves Total Reserves Commercial Real estate $ 224,000 $ 1,285,000 $ 2,363,000 $ — $ 3,872,000 Construction — 153,000 281,000 — 434,000 Other 1,309,000 723,000 1,326,000 — 3,358,000 Municipal — — 20,000 — 20,000 Residential Term 255,000 311,000 564,000 — 1,130,000 Construction — 13,000 23,000 — 36,000 Home equity line of credit 24,000 297,000 371,000 — 692,000 Consumer — 251,000 294,000 — 545,000 Unallocated — — — 642,000 642,000 $ 1,812,000 $ 3,033,000 $ 5,242,000 $ 642,000 $ 10,729,000 Qualitative adjustment factors are taken into consideration when determining reserve estimates. These adjustment factors are based upon our evaluation of various current conditions, including those listed below. • General economic conditions. • Credit quality trends with emphasis on loan delinquencies, nonaccrual levels and classified loans. • Recent loss experience in particular segments of the portfolio. • Loan volumes and concentrations, including changes in mix. • Other factors, including changes in quality of loan originations; loan policy changes; changes in credit risk management processes; Bank regulatory and external loan review examination results. The qualitative portion of the allowance for loan losses was 0.45% of related loans as of December 31, 2018 and 2017. The qualitative portion increased $381,000 between December 31, 2017 and December 31, 2018 due to a mix of factors. The unallocated component totaled $1,216,000 at December 31, 2018 , or 10.8% of the total reserve. This compares to $642,000 or 6.0% as of December 31, 2017 . The change supported general imprecision related to portfolio growth and includes considerations of general economic and business conditions affecting our lending area, credit quality trends (including trends in delinquencies and nonperforming loans expected to result from existing conditions), loan volumes and concentrations, duration of the current business cycle, bank regulatory examination results, findings of external loan review examiners, and Management's judgment with respect to various other conditions including loan administration and management and the quality of risk identification systems. Consequently, there maybe underlying credit risks that have not yet surfaced in the loan specific or qualitative metrics the Company uses to estimate its allowance for loan losses that are reflected in the unallocated component. The allowance for loan losses as a percent of total loans stood at 0.91% as of December 31, 2018 , compared to 0.92% of total loans as of December 31, 2017 . Commercial loans are comprised of three major classes: commercial real estate loans, commercial construction loans and other commercial loans. Commercial real estate loans consist of mortgage loans to finance investments in real property, such as multi-family residential, commercial/retail, office, industrial, hotels, educational and other specific or mixed use properties. Commercial real estate loans are typically written with amortizing payment structures. Collateral values are determined based on appraisals and evaluations in accordance with established policy and regulatory guidelines. Commercial real estate loans typically have a loan-to-value ratio of up to 80% based upon current valuation information at the time the loan is made. Commercial real estate loans are primarily paid by the cash flow generated from the real property, such as operating leases, rents, or other operating cash flows from the borrower. Commercial construction loans consist of loans to finance construction in a mix of owner- and non-owner occupied commercial real estate properties. Commercial construction loans typically have maturities of less than two years . Payment structures during the construction period are typically on an interest only basis, although principal payments may be established depending on the type of construction project being financed. During the construction phase, commercial construction loans are primarily paid by cash flow generated from the construction project or other operating cash flows from the borrower or guarantors, if applicable. At the end of the construction period, loan repayment typically comes from a third party source in the event that the Bank will not be providing permanent term financing. Collateral valuation and loan-to-value guidelines follow those for commercial real estate loans. Other commercial loans consist of revolving and term loan obligations extended to business and corporate enterprises for the purpose of financing working capital or capital investment. Collateral generally consists of pledges of business assets including, but not limited to, accounts receivable, inventory, plant and equipment, and/or real estate, if applicable. Commercial loans are primarily paid by the operating cash flow of the borrower. Commercial loans may be secured or unsecured. Municipal loans are comprised of loans to municipalities in Maine for capitalized expenditures, construction projects or tax-anticipation notes. All municipal loans are considered general obligations of the municipality and are collateralized by the taxing ability of the municipality for repayment of debt. Residential loans are comprised of two classes: term loans and construction loans. Residential term loans consist of residential real estate loans held in the Bank's loan portfolio made to borrowers who demonstrate the ability to make scheduled payments with full consideration of underwriting factors. Borrower qualifications include favorable credit history combined with supportive income requirements and loan-to-value ratios within established policy and regulatory guidelines. Collateral values are determined based on appraisals and evaluations in accordance with established policy and regulatory guidelines. Residential loans typically have a loan-to-value ratio of up to 80% based on appraisal information at the time the loan is made. Collateral consists of mortgage liens on one- to four-family residential properties. Loans are offered with fixed or adjustable rates with amortization terms of up to thirty years . Residential construction loans typically consist of loans for the purpose of constructing single family residences to be owned and occupied by the borrower. Borrower qualifications include favorable credit history combined with supportive income requirements and loan-to-value ratios within established policy and regulatory guidelines. Residential construction loans normally have terms of one year or less and payment during the construction term is typically on an interest only basis from sources including interest reserves, borrower liquidity and/or income. Residential construction loans will typically convert to permanent financing from the Bank or have another financing commitment in place from an acceptable mortgage lender. Collateral valuation and loan-to-value guidelines are consistent with those for residential term loans. Home equity lines of credit are made to qualified individuals and are secured by senior or junior mortgage liens on owner-occupied one- to four-family homes, condominiums, or vacation homes. The home equity line of credit typically has a variable interest rate and is billed as interest-only payments during the draw period. At the end of the draw period, the home equity line of credit payments are billed as a percentage of the principal balance plus all accrued interest. Loan maturities are normally 300 months . Borrower qualifications include favorable credit history combined with supportive income requirements and combined loan-to- value ratios usually not exceeding 80% inclusive of priority liens. Collateral valuation guidelines follow those for residential real estate loans. Consumer loan products including personal lines of credit and amortizing loans made to qualified individuals for various purposes such as auto, recreational vehicles, debt consolidation, personal expenses or overdraft protection. Borrower qualifications include favorable credit history combined with supportive income and collateral requirements within established policy guidelines. Consumer loans may be secured or unsecured. Construction, land and land development loans, both commercial and residential, comprise a small portion of the portfolio, and at 25.7% of capital are below the regulatory guidance of 100.0% of capital at December 31, 2018 . Construction loans and non- owner-occupied commercial real estate loans are at 126.4% of total capital at December 31, 2018 , below the regulatory limit of 300.0% of capital. The process of establishing the allowance with respect to the commercial loan portfolio begins when a Loan Officer or Senior Officer (or designate) initially assigns each loan a risk rating, using established credit criteria, which is reviewed and updated if necessary at least annually or when conditions may warrant a change in the assigned risk rating. Approximately 60% of the outstanding loans and commitments are subject to review and validation annually by an independent consulting firm. Additionally, commercial loan relationships with exposure greater than or equal to $500,000 and lines of credit greater than $250,000 are subject to review annually by the Bank's internal credit review function. The methodology employs Management's judgment as to the level of losses on existing loans based on internal review of the loan portfolio, including an analysis of a borrower's current financial position, and the consideration of current and anticipated economic conditions and their potential effects on specific borrowers or lines of business. In determining the Company's ability to collect certain loans, Management also considers the fair value of underlying collateral. The risk rating system has eight levels, defined as follows: 1 Strong Credits rated "1" are characterized by borrowers fully responsible for the credit with excellent capacity to pay principal and interest. Loans rated "1" may be secured with acceptable forms of liquid collateral. 2 Above Average Credits rated "2" are characterized by borrowers that have better than average liquidity, capitalization, earnings and/or cash flow with a consistent record of solid financial performance. 3 Satisfactory Credits rated "3" are characterized by borrowers with favorable liquidity, profitability and financial condition with adequate cash flow to pay debt service. 4 Average Credits rated "4" are characterized by borrowers that present risk more than 1, 2 and 3 rated loans and merit an ordinary level of ongoing monitoring. Financial condition is on par or somewhat below industry averages while cash flow is generally adequate to meet debt service requirements. 5 Watch Credits rated "5" are characterized by borrowers that warrant greater monitoring due to financial condition or unresolved and identified risk factors. 6 Other Assets Especially Mentioned (OAEM) Loans in this category are currently supported but are potentially weak and constitute an undue and unwarranted credit risk, but not to the point of justifying a classification of substandard. OAEM have potential weaknesses which may, if not checked or corrected, weaken the asset or inadequately protect the Bank's credit position at some future date. 7 Substandard Loans in this category are inadequately supported by the current paying capacity of the borrower or of the collateral, if any. These loans have a well-defined weakness or weaknesses that jeopardize the liquidation of the debt. Substandard loans are characterized by the distinct possibility that the Bank may sustain some loss if deficiencies are not corrected. 8 Doubtful Loans classified "Doubtful" have the same weaknesses as those classified substandard with the added characteristic that the weaknesses make collection or liquidation in full, based on currently existing facts, conditions, and values, highly questionable and improbable. The possibility of loss is high, but because of certain important and reasonably specific pending factors which may work to the advantage and strengthening of the asset, its classification as an estimated loss is deferred until its more exact status may be determined. The following table summarizes the risk ratings for the Company's commercial construction, commercial real estate, commercial other and municipal loans as of December 31, 2018 : Commercial Real Estate Commercial Construction Commercial Other Municipal Loans All Risk- Rated Loans 1 Strong $ — $ — $ 3,444,000 $ — $ 3,444,000 2 Above average 10,484,000 37,000 4,564,000 48,800,000 63,885,000 3 Satisfactory 80,266,000 2,231,000 46,090,000 518,000 129,105,000 4 Average 172,597,000 18,780,000 82,081,000 1,810,000 275,268,000 5 Watch 66,325,000 5,970,000 45,546,000 — 117,841,000 6 OAEM 6,890,000 — 1,805,000 — 8,695,000 7 Substandard 16,558,000 286,000 12,861,000 — 29,705,000 8 Doubtful 123,000 — — — 123,000 Total $ 353,243,000 $ 27,304,000 $ 196,391,000 $ 51,128,000 $ 628,066,000 The following table summarizes the risk ratings for the Company's commercial construction, commercial real estate, commercial other and municipal loans as of December 31, 2017 : Commercial Real Estate Commercial Construction Commercial Other Municipal Loans All Risk- Rated Loans 1 Strong $ — $ — $ 1,586,000 $ — $ 1,586,000 2 Above average 12,534,000 40,000 5,776,000 32,673,000 51,023,000 3 Satisfactory 73,899,000 2,856,000 38,151,000 718,000 115,624,000 4 Average 173,956,000 22,446,000 84,360,000 — 280,762,000 5 Watch 41,652,000 12,714,000 33,934,000 — 88,300,000 6 OAEM 3,442,000 — 2,765,000 — 6,207,000 7 Substandard 18,203,000 — 14,956,000 — 33,159,000 8 Doubtful 123,000 — — — 123,000 Total $ 323,809,000 $ 38,056,000 $ 181,528,000 $ 33,391,000 $ 576,784,000 Commercial loans are generally charged off when all or a portion of the principal amount is determined to be uncollectible. This determination is based on circumstances specific to a borrower including repayment ability, analysis of collateral and other factors as applicable. Residential loans are comprised of two classes: term loans, which include traditional amortizing home mortgages, and construction loans, which include loans for owner-occupied residential construction. Residential loans typically have a 75% to 80% loan to value ratio based upon current appraisal information at the time the loan is made. Home equity loans and lines of credit are typically written to the same underwriting standards. Consumer loans are primarily amortizing loans to individuals collateralized by automobiles, pleasure craft and recreation vehicles, typically with a maximum loan to value ratio of 80% to 90% of the purchase price of the collateral. Consumer loans also include a small amount of unsecured short-term time notes to individuals. Residential loans, consumer loans and home equity lines of credit are segregated into homogeneous pools with similar risk characteristics. Trends and current conditions are analyzed and historical loss experience is adjusted accordingly. Quantitative and qualitative adjustment factors for these segments are consistent with those for the commercial and municipal classes. Certain loans in the residential, home equity lines of credit and consumer classes identified as having the potential for further deterioration are analyzed individually to confirm impairment status, and to determine the need for a specific reserve; however, there is no formal rating system used for these classes. Consumer loans greater than 120 days past due are generally charged off. Residential loans 90 days or more past due are placed on non-accrual status unless the loans are both well secured and in the process of collection. One-to four-family residential real estate loans and home equity loans are written down or charged-off no later than 180 days past due, or for residential real estate secured loans having a borrower in bankruptcy, within 60 days of receipt of notification of filing from the bankruptcy court, whichever is sooner. This is subject to completion of a current assessment of the value of the collateral with any outstanding loan balance in excess of the fair value of the property, less costs to sell, written down or charged-off. There were no changes to the Company's accounting policies or methodology used to estimate the allowance for loan losses during the year ended December 31, 2018 . The following tables present allowance for loan losses activity by class, allowance for loan loss balances by class and related loan balances by class for the years ended December 31, 2018 , 2017 and 2016 : For the year ended December 31, 2018 Commercial Residential Home Equity Line of Credit Real Estate Construction Other Municipal Term Construction Consumer Unallocated Total Allowance for loan losses: Beginning balance $ 3,872,000 $ 434,000 $ 3,358,000 $ 20,000 $ 1,130,000 $ 36,000 $ 692,000 $ 545,000 $ 642,000 $ 10,729,000 Chargeoffs 168,000 — 423,000 — 213,000 — 121,000 348,000 — 1,273,000 Recoveries 52,000 — 40,000 — 64,000 — 24,000 96,000 — 276,000 Provision (credit) (189,000 ) (179,000 ) 566,000 4,000 254,000 (2,000 ) 135,000 337,000 574,000 1,500,000 Ending balance $ 3,567,000 $ 255,000 $ 3,541,000 $ 24,000 $ 1,235,000 $ 34,000 $ 730,000 $ 630,000 $ 1,216,000 $ 11,232,000 Ending balance specifically evaluated for impairment $ 260,000 $ — $ 1,696,000 $ — $ 335,000 $ — $ 17,000 $ — $ — $ 2,308,000 Ending balance collectively evaluated for impairment $ 3,307,000 $ 255,000 $ 1,845,000 $ 24,000 $ 900,000 $ 34,000 $ 713,000 $ 630,000 $ 1,216,000 $ 8,924,000 Related loan balances: Ending balance $ 353,243,000 $ 27,304,000 $ 196,391,000 $ 51,128,000 $ 469,145,000 $ 17,743,000 $ 98,469,000 $ 24,860,000 $ — $ 1,238,283,000 Ending balance specifically evaluated for impairment $ 9,760,000 $ 721,000 $ 9,259,000 $ — $ 10,904,000 $ — $ 1,092,000 $ 15,000 $ — $ 31,751,000 Ending balance collectively evaluated for impairment $ 343,483,000 $ 26,583,000 $ 187,132,000 $ 51,128,000 $ 458,241,000 $ 17,743,000 $ 97,377,000 $ 24,845,000 $ — $ 1,206,532,000 For the year ended December 31, 2017 Commercial Residential Home Equity Line of Credit Real Estate Construction Other Municipal Term Construction Consumer Unallocated Total Allowance for loan losses: Beginning balance $ 3,988,000 $ 396,000 $ 1,780,000 $ 18,000 $ 1,288,000 $ 44,000 $ 807,000 $ 559,000 $ 1,258,000 $ 10,138,000 Chargeoffs 587,000 — 212,000 — 456,000 — 28,000 335,000 — 1,618,000 Recoveries — — 49,000 — 40,000 — 11,000 109,000 — 209,000 Provision (credit) 471,000 38,000 1,741,000 2,000 258,000 (8,000 ) (98,000 ) 212,000 (616,000 ) 2,000,000 Ending balance $ 3,872,000 $ 434,000 $ 3,358,000 $ 20,000 $ 1,130,000 $ 36,000 $ 692,000 $ 545,000 $ 642,000 $ 10,729,000 Ending balance specifically evaluated for impairment $ 224,000 $ — $ 1,309,000 $ — $ 255,000 $ — $ 24,000 $ — $ — $ 1,812,000 Ending balance collectively evaluated for impairment $ 3,648,000 $ 434,000 $ 2,049,000 $ 20,000 $ 875,000 $ 36,000 $ 668,000 $ 545,000 $ 642,000 $ 8,917,000 Related loan balances: Ending balance $ 323,809,000 $ 38,056,000 $ 181,528,000 $ 33,391,000 $ 432,661,000 $ 17,868,000 $ 111,302,000 $ 25,524,000 $ — $ 1,164,139,000 Ending balance specifically evaluated for impairment $ 7,790,000 $ 741,000 $ 9,918,000 $ — $ 11,748,000 $ — $ 1,179,000 $ 16,000 $ — $ 31,392,000 Ending balance collectively evaluated for impairment $ 316,019,000 $ 37,315,000 $ 171,610,000 $ 33,391,000 $ 420,913,000 $ 17,868,000 $ 110,123,000 $ 25,508,000 $ — $ 1,132,747,000 For the year ended December 31, 2016 Commercial Residential Home Equity Line of Credit Real Estate Construction Other Municipal Term Construction Consumer Unallocated Total Allowance for loan losses: Beginning balance $ 3,120,000 $ 580,000 $ 1,452,000 $ 17,000 $ 1,391,000 $ 24,000 $ 893,000 $ 566,000 $ 1,873,000 $ 9,916,000 Chargeoffs 294,000 75,000 376,000 — 379,000 — 147,000 450,000 — 1,721,000 Recoveries — 8,000 129,000 — 93,000 — 5,000 108,000 — 343,000 Provision (credit) 1,162,000 (117,000 ) 575,000 1,000 183,000 20,000 56,000 335,000 (615,000 ) 1,600,000 Ending balance $ 3,988,000 $ 396,000 $ 1,780,000 $ 18,000 $ 1,288,000 $ 44,000 $ 807,000 $ 559,000 $ 1,258,000 $ 10,138,000 Ending balance specifically evaluated for impairment $ 505,000 $ 100,000 $ 39,000 $ — $ 304,000 $ — $ 26,000 $ — $ — $ 974,000 Ending balance collectively evaluated for impairment $ 3,483,000 $ 296,000 $ 1,741,000 $ 18,000 $ 984,000 $ 44,000 $ 781,000 $ 559,000 $ 1,258,000 $ 9,164,000 Related loan balances: Ending balance $ 302,506,000 $ 25,406,000 $ 150,769,000 $ 27,056,000 $ 411,469,000 $ 18,303,000 $ 110,907,000 $ 25,110,000 $ — $ 1,071,526,000 Ending balance specifically evaluated for impairment $ 10,021,000 $ 763,000 $ 1,743,000 $ — $ 13,669,000 $ — $ 1,387,000 $ — $ — $ 27,583,000 Ending balance collectively evaluated for impairment $ 292,485,000 $ 24,643,000 $ 149,026,000 $ 27,056,000 $ 397,800,000 $ 18,303,000 $ 109,520,000 $ 25,110,000 $ — $ 1,043,943,000

Premises and Equipment

Premises and Equipment	12 Months Ended
	Dec. 31, 2018
Property, Plant and Equipment [Abstract]
Premises and Equipment	Premises and Equipment Premises and equipment are carried at cost and consist of the following: As of December 31, 2018 2017 Land $ 4,852,000 $ 4,639,000 Land improvements 1,105,000 1,052,000 Buildings 22,301,000 22,254,000 Equipment 12,461,000 13,147,000 40,719,000 41,092,000 Less accumulated depreciation 18,663,000 18,590,000 $ 22,056,000 $ 22,502,000 Future minimum receipts under lease agreements at December 31, 2018 for each of the next five years and in the aggregate are: 2019 $141,000 2020 101,000 2021 97,000 2022 94,000 2023 9,000 Thereafter — $442,000

Other Real Estate Owned

Other Real Estate Owned	12 Months Ended
	Dec. 31, 2018
Real Estate Owned, Disclosure of Detailed Components [Abstract]
Other Real Estate Owned	Other Real Estate Owned The following summarizes other real estate owned: As of December 31, 2018 2017 Real estate acquired in settlement of loans $ 584,000 $ 1,012,000 Changes in the allowance for losses from other real estate owned were as follows: For the years ended December 31, 2018 2017 2016 Balance at beginning of year $ 53,000 $ 205,000 $ 162,000 Losses charged to allowance (53,000 ) (169,000 ) (89,000 ) Provision charged to operating expenses — 17,000 132,000 Balance at end of year $ — $ 53,000 $ 205,000

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes The current and deferred components of income tax expense (benefit) were as follows: For the years ended December 31, 2018 2017 2016 Federal income tax Current $ 4,407,000 $ 4,184,000 $ 6,276,000 Deferred (492,000 ) 2,083,000 (139,000 ) 3,915,000 6,267,000 6,137,000 State franchise tax 391,000 345,000 317,000 $ 4,306,000 $ 6,612,000 $ 6,454,000 The actual tax expense differs from the expected tax expense (computed by applying the applicable U.S. Federal corporate income tax rate to income before income taxes) as follows: For the years ended December 31, 2018 2017 2016 Expected tax expense $ 5,847,000 $ 9,170,000 $ 8,562,000 Non-taxable income (1,699,000 ) (2,625,000 ) (2,176,000 ) State franchise tax, net of federal tax benefit 309,000 224,000 206,000 Equity compensation (55,000 ) (83,000 ) — Tax credits, net of amortization (85,000 ) (88,000 ) (105,000 ) Change in federal tax rate — 134,000 — Other (11,000 ) (120,000 ) (33,000 ) $ 4,306,000 $ 6,612,000 $ 6,454,000 Deferred tax assets and liabilities are recognized at the expected future tax rate. On December 22, 2017, the federal tax rate decreased from 35% to 21% effective January 1, 2018. Accordingly, deferred tax assets and liabilities were revalued at December 31, 2017 to reflect the 21% tax rate. Deferred tax assets and liabilities are classified in other assets and other liabilities in the consolidated balance sheets. No valuation allowance is deemed necessary for the deferred tax asset. Items that give rise to the deferred income tax assets and liabilities and the tax effect of each at December 31, 2018 and 2017 are as follows: 2018 2017 Allowance for loan losses $ 2,359,000 $ 2,253,000 OREO — 11,000 Accrued pension and post-retirement 955,000 1,036,000 Unrealized loss on securities transferred from available for sale to held to maturity 52,000 46,000 Unrealized loss on securities available for sale 1,343,000 772,000 Restricted stock grants 170,000 173,000 Core deposit intangible 18,000 15,000 Investment in flow through entities 31,000 22,000 Other assets 24,000 28,000 Total deferred tax asset 4,952,000 4,356,000 Net deferred loan costs (1,504,000 ) (1,313,000 ) Depreciation (1,300,000 ) (1,306,000 ) Goodwill (80,000 ) (39,000 ) Mortgage servicing rights (284,000 ) (266,000 ) Unrealized gain on derivative instruments (382,000 ) (410,000 ) Prepaid expense (159,000 ) (821,000 ) Total deferred tax liability (3,709,000 ) (4,155,000 ) Net deferred tax asset $ 1,243,000 $ 201,000 At December 31, 2018 , the Company held investments in three limited partnerships with related low income housing tax credits compared to two at December 31, 2017. The investments are carried at cost and amortized on the effective yield method as they were entered into prior to 2015. The tax credits from the investments are estimated at $210,000 and $204,000 for the years ended December 31, 2018 and 2017 , respectively, and are recorded as a reduction of income tax expense. Amortization of the investment in the limited partnership totaled $186,000 and $178,000 for the years ended December 31, 2018 and 2017 , respectively, and is recognized as a component of income tax expense in the consolidated statements of income. The carrying value of these investments was $1,408,000 and at December 31, 2018 and 2017 , and is recorded in other assets. The Company's total exposure to the limited partnerships was $1,408,000 at December 31, 2018 and 2017 , which is comprised of the Company's equity investment in the limited partnerships. FASB ASC Topic 740, "Income Taxes," defines the criteria that an individual tax position must satisfy for some or all of the benefits of that position to be recognized in a company's financial statements. Topic 740 prescribes a recognition threshold of more-likely-than-not, and a measurement attribute for all tax positions taken or expected to be taken on a tax return, in order for those tax positions to be recognized in the financial statements. The Company is currently open to audit under the statute of limitations by the Internal Revenue Service for the years ended December 31, 2015 through 2018

Certificates of Deposit

Certificates of Deposit	12 Months Ended
	Dec. 31, 2018
Banking and Thrift [Abstract]
Certificates of Deposit	Certificates of Deposit The following table represents the breakdown of certificates of deposit at December 31, 2018 and 2017 : December 31, 2018 December 31, 2017 Certificates of deposit < $100,000 $ 372,464,000 $ 284,066,000 Certificates $100,000 to $250,000 162,185,000 232,759,000 Certificates $250,000 and over 56,760,000 42,176,000 $ 591,409,000 $ 559,001,000 At December 31, 2018 , the scheduled maturities of certificates of deposit are as follows: Year of Maturity Less than $100,000 $100,000 and Greater All Certificates of Deposit 2019 $ 303,468,000 $ 108,341,000 $ 411,809,000 2020 25,150,000 36,046,000 61,196,000 2021 20,073,000 24,534,000 44,607,000 2022 10,752,000 16,831,000 27,583,000 2023 13,015,000 33,193,000 46,208,000 2024 and thereafter 6,000 — 6,000 $ 372,464,000 $ 218,945,000 $ 591,409,000 Interest on certificates of deposit of $100,000 or more was $3,038,000 , $2,105,000 , and $1,970,000 in 2018 , 2017 and 2016

Borrowed Funds

Borrowed Funds	12 Months Ended
	Dec. 31, 2018
Borrowed Funds [Abstract]
Borrowed Funds	Borrowed Funds Borrowed funds consist of advances from the FHLB and securities sold under agreements to repurchase with municipal and commercial customers. Pursuant to collateral agreements, FHLB advances are collateralized by all stock in FHLB, qualifying first mortgage loans, U.S. Government and Agency securities not pledged to others, and funds on deposit with FHLB. All FHLB advances as of December 31, 2018 had fixed rates of interest until their respective maturity dates. Securities sold under agreements to repurchase include U.S. agencies securities and other securities. Repurchase agreements have maturity dates ranging from one to 365 days. The Bank also has in place $46,000,000 in credit lines with correspondent banks and a credit facility of $84,000,000 with the Federal Reserve Bank of Boston using commercial and home equity loans as collateral, which are currently not in use. Borrowed funds at December 31, 2018 and 2017 have the following range of interest rates and maturity dates: As of December 31, 2018 Federal Home Loan Bank Advances 2019 2.25% - 2.58% $ 105,000,000 2020 1.60% - 1.97% 55,000,000 2021 1.55% 10,000,000 2024 and thereafter 0.00% 112,000 170,112,000 Repurchase agreements Municipal and commercial customers 0.15% - 2.00% 40,205,000 $ 210,317,000 As of December 31, 2017 Federal Home Loan Bank Advances 2018 1.59% - 3.25% $ 43,074,000 2020 1.60% - 1.97% 55,000,000 2021 1.55% 10,000,000 2023 and thereafter 0.00% - 0.99% 50,120,000 158,194,000 Repurchase agreements Municipal and commercial customers 0.15% - 2.48% 70,564,000 $ 228,758,000

Employee Benefit Plans

Employee Benefit Plans	12 Months Ended
	Dec. 31, 2018
Retirement Benefits, Description [Abstract]
Employee Benefit Plans	Employee Benefit Plans 401(k) Plan The Bank has a defined contribution plan available to substantially all employees who have completed three months of service. Employees may contribute up to Internal Revenue Service determined limits and the Bank may provide a match to employee contributions not to exceed 3.0% of compensation depending on contribution level. Subject to a vote of the Board of Directors, the Bank may also make a profit-sharing contribution to the Plan. Such contribution equaled 2.0% of each eligible employee's compensation in 2018 , 2017 , and 2016 . The expense related to the 401(k) plan was $578,000 , $554,000 , and $435,000 in 2018 , 2017 , and 2016 , respectively. Deferred Compensation and Supplemental Retirement Plan The Bank also provides unfunded supplemental retirement benefits for certain officers, payable in installments over 20 years commencing upon retirement or death. The agreements consist of individual contracts with differing characteristics that, when taken together, do not constitute a post-retirement plan. The costs for these benefits are recognized over the service periods of the participating officers in accordance with FASB ASC Topic 712, "Compensation – Nonretirement Postemployment Benefits". The expense of these supplemental plans was $176,000 in 2018 , $219,000 in 2017 , and $215,000 in 2016 . As of December 31, 2018 and 2017 , the accrued liability of these plans was $2,949,000 and $3,060,000 , respectively, and is recorded in other liabilities. Post-Retirement Benefit Plans The Bank sponsors two post-retirement benefit plans. One plan currently provides a subsidy for health insurance premiums to certain retired employees and a future subsidy for six active employees who were age 50 and over in 1996. These subsidies are based on years of service and range between $40 and $1,200 per month per person. The Bank also provides health insurance for retired directors. The other plan provides life insurance coverage to certain retired employees. None of these plans are pre-funded. The Company utilizes FASB ASC Topic 712 to recognize the overfunded or underfunded status of a defined benefit post-retirement plan as an asset or liability in its balance sheet and to recognize changes in the funded status in the year in which the changes occur through comprehensive income (loss). The following table sets forth the accumulated post-retirement benefit obligation and funded status: At December 31, 2018 2017 2016 Change in benefit obligations Benefit obligation at beginning of year: $ 1,874,000 $ 1,870,000 $ 1,967,000 Interest cost 77,000 77,000 81,000 Benefits paid (117,000 ) (113,000 ) (109,000 ) Actuarial (gain) loss (235,000 ) 40,000 (69,000 ) Benefit obligation at end of year: $ 1,599,000 $ 1,874,000 $ 1,870,000 Funded status Benefit obligation at end of year $ (1,599,000 ) $ (1,874,000 ) $ (1,870,000 ) Unamortized (gain) loss (47,000 ) 186,000 156,000 Accrued benefit cost $ (1,646,000 ) $ (1,688,000 ) $ (1,714,000 ) Weighted average discount rate as of December 31 4.25 % 4.25 % 4.25 % The following table sets forth the net periodic benefit cost: For the years ended December 31, 2018 2017 2016 Components of net periodic benefit cost Interest cost $ 77,000 $ 77,000 $ 81,000 Amortization of loss — — 4,000 Other settlement (income) expense (3,000 ) 11,000 11,000 Net periodic benefit cost $ 74,000 $ 88,000 $ 96,000 Weighted average discount rate for net periodic cost 4.25 % 4.25 % 4.25 % The measurement date for benefit obligations was as of year-end for all years presented. The estimated amount of benefits to be paid in 2019 is $113,000 . For years ending 2020 through 2023 , the estimated amount of benefits to be paid is $112,000 , $111,000 , $109,000 and $108,000 , respectively, and the total estimated amount of benefits to be paid for years ended 2023 through 2027 is $604,000 . Plan expense for 2019 is estimated to be $66,000 . In accordance with FASB ASC Topic 715, "Compensation – Retirement Benefits", amounts not yet reflected in net periodic benefit cost and included in accumulated other comprehensive income (loss) are as follows: At December 31, 2018 2017 Portion to Be Recognized in Income in 2019 Unamortized net actuarial gain (loss) $ 47,000 $ (186,000 ) $ (160,000 ) Deferred tax (expense) benefit at 21% in 2018 and 35% in 2017 (10,000 ) 65,000 34,000 Reclassification adjustment for effect of enacted tax law changes — (26,000 ) — Net unrecognized post-retirement benefits included in accumulated other comprehensive income (loss) $ 37,000 $ (147,000 ) $ (126,000 )

Other Comprehensive Income (Los

Other Comprehensive Income (Loss)	12 Months Ended
	Dec. 31, 2018
Equity [Abstract]
Other Comprehensive Income (Loss)	Other Comprehensive Income (Loss) The following table summarizes activity in the unrealized gain or loss on available for sale securities included in other comprehensive income (loss) for the years ended December 31, 2018 , 2017 and 2016 . For the years ended December 31, 2018 2017 2016 Balance at beginning of year $ (2,901,000 ) $ (935,000 ) $ 1,123,000 Unrealized losses arising during the year (2,585,000 ) (1,763,000 ) (2,493,000 ) Reclassification of realized gains during the year (137,000 ) (471,000 ) (673,000 ) Related deferred taxes 572,000 782,000 1,108,000 Reclassification adjustment for effect of enacted tax law changes — (514,000 ) — Net change (2,150,000 ) (1,966,000 ) (2,058,000 ) Balance at end of year $ (5,051,000 ) $ (2,901,000 ) $ (935,000 ) The reclassification of realized gains is included in the net securities gains line of the consolidated statements of income and comprehensive income and the tax effect is included in the income tax expense line of the same statement. The following table summarizes activity in the unrealized loss on securities transferred from available for sale to held to maturity included in other comprehensive income (loss) for the years ended December 31, 2018 , 2017 , and 2016 . For the years ended December 31, 2018 2017 2016 Balance at beginning of year $ (174,000 ) $ (129,000 ) $ (112,000 ) Amortization of net unrealized losses (29,000 ) (22,000 ) (26,000 ) Related deferred taxes 6,000 8,000 9,000 Reclassification adjustment for effect of enacted tax law changes — (31,000 ) — Net change (23,000 ) (45,000 ) (17,000 ) Balance at end of year $ (197,000 ) $ (174,000 ) $ (129,000 ) The following table represents the effect of the Company's derivative financial instruments included in other comprehensive income (loss) for the years ended December 31, 2018 , 2017 , and 2016 . For the years ended December 31, 2018 2017 2016 Balance at beginning of year $ 1,544,000 $ 1,163,000 $ — Unrealized gains (losses) on cash flow hedging derivatives arising during the year (134,000 ) 165,000 1,790,000 Related deferred taxes 28,000 (58,000 ) (627,000 ) Reclassification adjustment for effect of enacted tax law changes — 274,000 — Net change (106,000 ) 381,000 1,163,000 Balance at end of year $ 1,438,000 $ 1,544,000 $ 1,163,000 The following table summarizes activity in the unrealized gain or loss on postretirement benefits included in other comprehensive income (loss) for the years ended December 31, 2018 , 2017 , and 2016 : For the years ended December 31, 2018 2017 2016 Unrecognized postretirement benefits at beginning of year $ (147,000 ) $ (102,000 ) $ (156,000 ) Change in unamortized net actuarial gain (loss) 233,000 (30,000 ) 84,000 Related deferred taxes (49,000 ) 11,000 (30,000 ) Reclassification adjustment for effect of enacted tax law changes — (26,000 ) $ — Net change 184,000 (45,000 ) $ 54,000 Unrecognized postretirement benefits at end of year $ 37,000 $ (147,000 ) $ (102,000 )

Financial Derivative Instrument

Financial Derivative Instruments	12 Months Ended
	Dec. 31, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Financial Derivative Instruments	Financial Derivative Instruments As part of its overall asset and liability management strategy, the Company periodically uses derivative instruments to mitigate significant unplanned fluctuations in earnings and cash flows caused by interest rate volatility. The Company’s interest rate risk management strategy involves modifying the re-pricing characteristics of certain assets or liabilities so that changes in interest rates do not have a significant effect on net interest income. The Company recognizes its derivative instruments in the consolidated balance sheet at fair value. On the date the derivative instrument is entered into, the Company designates whether the derivative is part of a hedging relationship (i.e., cash flow or fair value hedge). The Company formally documents relationships between hedging instruments and hedged items, as well as its risk management objective and strategy for undertaking hedge transactions. The Company also assesses, both at the hedge’s inception and on an ongoing basis, whether the derivatives used in hedging transactions are highly effective in offsetting the changes in cash flows or fair values of hedged items. Changes in fair value of derivative instruments that are highly effective and qualify as cash flow hedges are recorded in other comprehensive income or loss. Any ineffective portion is recorded in earnings. The Company discontinues hedge accounting when it is determined that the derivative is no longer highly effective in offsetting changes of the hedged risk on the hedged item, or management determines that the designation of the derivative as a hedging instrument is no longer appropriate. In 2016, then again in 2018, interest rate swaps were contracted to limit the Company’s exposure to rising interest rates on short-term liabilities indexed to one-month London Inter-bank Offered Rates (LIBOR). The interest rate swaps were designated as cash flow hedges. The details of the interest rate swap agreements are as follows: As of December 31, 2018 2017 Notional Amount Effective Date Maturity Date Variable Index Received Fixed Rate Paid Fair Value (1) Fair Value (1) $ 30,000,000 June 28, 2016 June 28, 2021 1-Month USD LIBOR 0.94 % $ 1,110,000 $ 1,154,000 $ 20,000,000 June 27, 2016 June 27, 2021 1-Month USD LIBOR 0.89 % $ 763,000 801,000 $ 25,000,000 June 5, 2018 December 5, 2019 1-Month USD LIBOR 2.47 % $ 16,000 — $ 25,000,000 June 5, 2018 June 5, 2020 1-Month USD LIBOR 2.55 % $ (9,000 ) — $ 25,000,000 June 5, 2018 December 5, 2020 1-Month USD LIBOR 2.60 % $ (60,000 ) — $ 125,000,000 $ 1,820,000 $ 1,955,000 (1) Presented within other assets in the consolidated balance sheet.

Preferred and Common Stock

Preferred and Common Stock	12 Months Ended
	Dec. 31, 2018
Stockholders' Equity Note [Abstract]
Preferred and Common Stock	Preferred and Common Stock Preferred Stock On January 9, 2009, the Company issued $25,000,000 in Fixed Rate Cumulative Perpetual Preferred Stock, Series A, to the U.S. Treasury under the Capital Purchase Program ("the CPP Shares"). The CPP Shares qualified as Tier 1 capital on the Company's books for regulatory purposes and ranked senior to the Company's common stock and senior or at an equal level in the Company's capital structure to any other shares of preferred stock the Company may issue in the future. In three separate transactions in 2012 and 2013, the Company repurchased all of the CPP Shares from the Treasury. Incident to such issuance of the CPP Shares, the Company issued to the U.S. Treasury warrants (the "Warrants") to purchase up to 225,904 shares of the Company's common stock at a price per share of $16.60 (subject to adjustment). The Warrants (and any shares of common stock issuable pursuant to the Warrants) are freely transferable by Treasury to third parties. The warrants have a term of 10 years and could be exercised by Treasury or a subsequent holder at any time or from time to time during their term. To the extent they had not previously been exercised, the Warrants will expire after ten years. The Warrants were unchanged as a result of the CPP Shares repurchase transactions. In May 2015, the Treasury sold all of the Warrants to private parties. In accordance with the contractual terms of the Warrants, the number of shares issuable upon exercise of the Warrants and the strike price were adjusted at the time of the sale. As a result of this transaction, the number of shares issuable under the Warrants was adjusted to 226,819 with a strike price of $16.53 per share. In November 2016, the Company repurchased all of the outstanding Warrants for an aggregate purchase price of $1,750,000 . Common Stock In 2016, the Company reserved 250,000 shares of its common stock to be made available to directors and employees who elect to participate in the stock purchase or savings and investment plans. As of December 31, 2018 , 39,411 shares had been issued pursuant to these plans, leaving 210,589 shares available for future use. The issuance price is based on the market price of the stock at issuance date. Prior to 2016, the Company had reserved 700,000 shares of its common stock to be made available to directors and employees who elect to participate in the stock purchase or savings investment plans. Sales of stock to directors and employees amounted to 12,138 shares in 2018 , 12,762 shares in 2017 , and 14,511 shares in 2016 . In 2001, the Company established a dividend reinvestment plan to allow shareholders to use their cash dividends for the automatic purchase of shares in the Company. The plan was amended in 2018 to reflect changes in its administration. When the plan was established, 600,000 shares were registered with the Securities and Exchange Commission, and as of December 31, 2018 , 267,284 shares have been issued, leaving 332,716 shares usable for future issuance. Participation in this plan is optional and at the individual discretion of each shareholder. Shares are purchased for the plan from the Company at a price per share equal to the average of the daily bid and asked prices reported on the NASDAQ System for the five trading days immediately preceding, but not including, the dividend payment date. Sales of stock under the dividend reinvestment plan amounted to 9,524 shares in 2018 , 9,922 shares in 2017 , and 10,889 shares in 2016 . Proceeds from issuances of common stock under these plans totaled $619,000 , $632,000 and $531,000 for the years ended December 31, 2018 , 2017 and 2016

Stock Options and Stock-Based C

Stock Options and Stock-Based Compensation	12 Months Ended
	Dec. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock Options and Stock-Based Compensation	Stock Options and Stock-Based Compensation At the 2010 Annual Meeting, shareholders approved the 2010 Equity Incentive Plan (the "2010 Plan"). This plan reserves 400,000 shares of common stock for issuance in connection with stock options, restricted stock awards and other equity based awards to attract and retain the best available personnel, provide additional incentive to officers, employees and non-employee Directors and promote the success of our business. Such grants and awards have been and will be structured in a manner that does not encourage the recipients to expose the Company to undue or inappropriate risk. Options issued under the 2010 Plan will qualify for treatment as incentive stock options for purposes of Section 422 of the Internal Revenue Code. Other compensation under the 2010 Plan will qualify as performance-based for purposes of Section 162(m) of the Internal Revenue Code, and will satisfy NASDAQ guidelines relating to equity compensation. As of December 31, 2018 , 144,355 shares of restricted stock had been granted under the 2010 Plan, of which 67,689 shares remain restricted as of December 31, 2018 as detailed in the following table: Year Granted Vesting Term (In Years) Shares Remaining Term (In Years) 2014 5.0 10,422 0.1 2015 5.0 12,023 1.0 2016 5.0 15,015 2.0 2017 3.0 4,902 1.1 2017 5.0 9,972 3.0 2018 1.0 300 0.1 2018 2.0 932 1.0 2018 3.0 2,400 2.1 2018 4.0 2,068 3.0 2018 5.0 9,655 4.0 67,689 1.8 The compensation cost related to these restricted stock grants was $1,489,000 and will be recognized over the vesting terms of each grant. In 2018 , $381,000 of expense was recognized for these restricted shares, leaving $678,000 in unrecognized expense as of December 31, 2018 . In 2017 , $392,000 of expense was recognized for restricted shares, leaving $601,000 in unrecognized expense as of December 31, 2017

Earnings Per Share

Earnings Per Share	12 Months Ended
	Dec. 31, 2018
Earnings Per Share [Abstract]
Earnings Per Share	Earnings Per Share The following table provides detail for basic earnings per share (EPS) and diluted (EPS) for the years ended December 31, 2018 , 2017 and 2016 : Income (Numerator) Shares (Denominator) Per-Share Amount For the year ended December 31, 2018 Net income as reported $ 23,536,000 Basic EPS: Income available to common shareholders 23,536,000 10,783,419 $ 2.18 Effect of dilutive securities: restricted stock 69,055 Diluted EPS: Income available to common shareholders plus assumed conversions $ 23,536,000 10,852,474 $ 2.17 For the year ended December 31, 2017 Net income as reported $ 19,588,000 Basic EPS: Income available to common shareholders 19,588,000 10,747,306 $ 1.82 Effect of dilutive securities: restricted stock 71,712 Diluted EPS: Income available to common shareholders plus assumed conversions $ 19,588,000 10,819,018 $ 1.81 For the year ended December 31, 2016 Net income as reported $ 18,009,000 Basic EPS: Income available to common shareholders 18,009,000 10,713,290 $ 1.68 Effect of dilutive securities: restricted stock and warrants 116,512 Diluted EPS: Income available to common shareholders plus assumed conversions $ 18,009,000 10,829,802 $ 1.66

Regulatory Capital Requirements

Regulatory Capital Requirements	12 Months Ended
	Dec. 31, 2018
Regulatory Capital Requirements [Abstract]
Regulatory Capital Requirements	Regulatory Capital Requirements The ability of the Company to pay cash dividends to its shareholders depends primarily on receipt of dividends from its subsidiary, the Bank. The Bank may pay dividends to its parent out of so much of its net income as the Bank's directors deem appropriate, subject to the limitation that the total of all dividends declared by the Bank in any calendar year may not exceed the total of its net income of that year combined with its retained net income of the preceding two years and subject to minimum regulatory capital requirements. The amount available for dividends in 2019 will be 2019 earnings plus retained earnings of $21,391,000 from 2018 and 2017 . The payment of dividends by the Company is also affected by various regulatory requirements and policies, such as the requirements to maintain adequate capital. In addition, if, in the opinion of the applicable regulatory authority, a bank under its jurisdiction is engaged in or is about to engage in an unsafe or unsound practice (which, depending on the financial condition of the bank, could include the payment of dividends), that authority may require, after notice and hearing, that such bank cease and desist from that practice. The Federal Reserve Bank and the Comptroller of the Currency have each indicated that paying dividends that deplete a bank's capital base to an inadequate level would be an unsafe and unsound banking practice. The Federal Reserve Bank, the Comptroller of the Currency and the Federal Deposit Insurance Corporation have issued policy statements which provide that bank holding companies and insured banks should generally only pay dividends out of current operating earnings. In addition to the effect on the payment of dividends, failure to meet minimum capital requirements can also result in mandatory and discretionary actions by regulators that, if undertaken, could have an impact on the Company's operations. Under capital adequacy guidelines and the regulatory framework for prompt corrective action, the Bank must meet specific capital guidelines that involve quantitative measurements of the Bank's assets, liabilities, and certain off-balance-sheet items as calculated under regulatory accounting practices. The Bank's capital amounts and classifications are also subject to qualitative judgments by the regulators about components, risk weightings, and other factors. Financial institution regulators have established guidelines for minimum capital ratios for banks and bank holding companies. The net unrealized gain or loss on securities available for sale is generally not included in computing regulatory capital. During the first quarter of 2015, the Company adopted the new Basel III regulatory capital framework as approved by the federal banking agencies. The adoption of this new framework modified the calculation of the various capital ratios, added a new ratio, common equity tier 1, and revised the adequately and well capitalized thresholds. Additionally, under the new rule, in order to avoid limitations on capital distributions, including dividend payments, the Company must hold a capital conservation buffer above the adequately capitalized risk-based capital ratios. The capital conservation buffer is being phased in from 0.0% for 2015 to 2.50% by 2019. As of December 31, 2018 , the Company's capital conservation buffer was 7.11% , and met both the 2018 minimum requirement of 2.25% and the fully phased-in 2019 minimum requirement. As of December 31, 2018 , the most recent notification from the Office of the Comptroller of the Currency classified the Bank as well-capitalized under the regulatory framework for prompt corrective action. To be categorized as well-capitalized, the Bank must maintain minimum total risk-based, Tier 1 risk-based, common equity Tier 1 risk-based and Tier 1 leverage ratios as set forth in the table. There are no conditions or events since this notification that Management believes have changed the institution's category. The actual and minimum capital amounts and ratios for the Bank are presented in the following table: Actual For capital adequacy purposes To be well-capitalized under prompt corrective action provisions As of December 31, 2018 Tier 2 capital to $ 175,448,000 $ 92,892,000 $ 116,115,000 risk-weighted assets 15.11 % 8.00 % 10.00 % Tier 1 capital to $ 164,116,000 $ 69,669,000 $ 92,892,000 risk-weighted assets 14.13 % 6.00 % 8.00 % Common equity Tier 1 capital to $ 164,116,000 $ 52,252,000 $ 75,474,000 risk-weighted assets 14.13 % 4.50 % 6.50 % Tier 1 capital to $ 164,116,000 $ 77,269,000 $ 96,586,000 average assets 8.51 % 4.00 % 5.00 % As of December 31, 2017 Tier 2 capital to $ 162,355,000 $ 86,063,000 $ 107,579,000 risk-weighted assets 15.09 % 8.00 % 10.00 % Tier 1 capital to $ 151,526,000 $ 64,548,000 $ 86,063,000 risk-weighted assets 14.09 % 6.00 % 8.00 % Common equity Tier 1 capital to $ 151,526,000 $ 48,411,000 $ 69,926,000 risk-weighted assets 14.09 % 4.50 % 6.50 % Tier 1 capital to $ 151,526,000 $ 71,386,000 $ 89,233,000 average assets 8.49 % 4.00 % 5.00 % The actual and minimum capital amounts and ratios for the Company, on a consolidated basis, are presented in the following table: Actual For capital adequacy purposes To be well-capitalized under prompt corrective action provisions As of December 31, 2018 Tier 2 capital to $ 176,349,000 $ 92,892,000 n/a risk-weighted assets 15.19 % 8.00 % n/a Tier 1 capital to $ 165,117,000 $ 69,669,000 n/a risk-weighted assets 14.22 % 6.00 % n/a Common equity Tier 1 capital to $ 165,117,000 $ 52,252,000 n/a risk-weighted assets 14.22 % 4.50 % n/a Tier 1 capital to $ 165,117,000 $ 76,810,000 n/a average assets 8.60 % 4.00 % n/a As of December 31, 2017 Tier 2 capital to $ 163,943,000 $ 86,070,000 n/a risk-weighted assets 15.24 % 8.00 % n/a Tier 1 capital to $ 153,114,000 $ 64,553,000 n/a risk-weighted assets 14.23 % 6.00 % n/a Common equity Tier 1 capital to $ 153,114,000 $ 48,415,000 n/a risk-weighted assets 14.23 % 4.50 % n/a Tier 1 capital to $ 153,114,000 $ 71,435,000 n/a average assets 8.57 % 4.00 % n/a

Off-Balance-Sheet Financial Ins

Off-Balance-Sheet Financial Instruments and Concentrations of Credit Risk	12 Months Ended
	Dec. 31, 2018
Commitments and Contingencies Disclosure [Abstract]
Off-Balance-Sheet Financial Instruments and Concentrations of Credit Risk	Off-Balance-Sheet Financial Instruments and Concentrations of Credit Risk The Bank is party to financial instruments with off-balance-sheet risk in the normal course of business to meet the financing needs of its customers. These financial instruments include commitments to originate loans, commitments for unused lines of credit, and standby letters of credit. The instruments involve, to varying degrees, elements of credit risk in excess of the amount recognized in the consolidated balance sheets. The contract amounts of those instruments reflect the extent of involvement the Bank has in particular classes of financial instruments. Commitments for unused lines of credit are agreements to lend to a customer provided there is no violation of any condition established in the contract. Commitments generally have fixed expiration dates or other termination clauses and may require payment of a fee. Since many of the commitments are expected to expire without being drawn upon, the total commitment amounts do not necessarily represent future cash requirements. The Bank evaluates each customer's creditworthiness on a case-by-case basis. The amount of collateral obtained, if deemed necessary by the Bank upon extension of credit, is based on Management's credit evaluation of the borrower. The Bank did not incur any losses on its commitments in 2018 , 2017 or 2016 . Standby letters of credit are conditional commitments issued by the Bank to guarantee a customer's performance to a third party, with the customer being obligated to repay (with interest) any amounts paid out by the Bank under the letter of credit. The credit risk involved in issuing letters of credit is essentially the same as that involved in extending loans to customers. The Bank's exposure to credit loss in the event of nonperformance by the other party to the financial instrument for loan commitments and standby letters of credit is represented by the contractual amount of those instruments. The Bank uses the same credit policies in making commitments and conditional obligations as it does for on-balance sheet instruments. At December 31, 2018 and 2017 , the Bank had the following off-balance-sheet financial instruments, whose contract amounts represent credit risk: As of December 31, 2018 2017 Unused lines, collateralized by residential real estate $ 83,421,000 $ 76,887,000 Other unused commitments 60,033,000 62,771,000 Standby letters of credit 3,590,000 3,497,000 Commitments to extend credit 19,268,000 8,724,000 Total $ 166,312,000 $ 151,879,000 The Bank grants residential, commercial and consumer loans to customers principally located in the Mid-Coast and Down East regions of Maine. Collateral on these loans typically consists of residential or commercial real estate, or personal property. Although the loan portfolio is diversified, a substantial portion of borrowers' ability to honor their contracts is dependent on the economic conditions in the area, especially in the real estate sector. Derivative Financial Instruments Designated as Hedges As part of its overall asset and liability management strategy, the Company periodically uses derivative instruments to minimize significant unplanned fluctuations in earnings and cash flows caused by interest rate volatility. The Company's interest rate risk management strategy involves modifying the re-pricing characteristics of certain assets and/or liabilities so that change in interest rates does not have a significant adverse effect on net interest income. Derivative instruments that Management periodically uses as part of its interest rate risk management strategy may include interest rate swap agreements, interest rate floor agreements, and interest rate cap agreements. At December 31, 2018 , the Company had five outstanding, off-balance sheet, derivative instruments. These derivative instruments were interest rate swap agreements, with notional principal amounts totaling $125,000,000 and an unrealized gain of $1,438,000 , net of tax. The notional amounts of the financial derivative instruments do not represent exposure to credit loss. The Company is exposed to credit loss only to the extent the counter-party defaults in its responsibility to pay interest under the terms of the agreements. The credit risk in derivative instruments is mitigated by entering into transactions with highly-rated counterparties that Management believes to be creditworthy and by limiting the amount of exposure to each counter-party. At December 31, 2018

Fair Value Disclosures

Fair Value Disclosures	12 Months Ended
	Dec. 31, 2018
Fair Value Disclosures [Abstract]
Fair Value Disclosures	Fair Value Disclosures Certain assets and liabilities are recorded at fair value to provide additional insight into the Company's quality of earnings. Some of these assets and liabilities are measured on a recurring basis while others are measured on a nonrecurring basis, with the determination based upon applicable existing accounting pronouncements. For example, securities available for sale are recorded at fair value on a recurring basis. Other assets, such as mortgage servicing rights, loans held for sale, and impaired loans, are recorded at fair value on a nonrecurring basis using the lower of cost or market methodology to determine impairment of individual assets. The Company groups assets and liabilities which are recorded at fair value in three levels, based on the markets in which the assets and liabilities are traded and the reliability of the assumptions used to determine fair value. A financial instrument's level within the fair value hierarchy is based on the lowest level of input that is significant to the fair value measurement (with level 1 considered highest and level 3 considered lowest). A brief description of each level follows. Level 1 – Valuation is based upon quoted prices for identical instruments in active markets. Level 2 – Valuation is based upon quoted prices for similar instruments in active markets, quoted prices for identical or similar instruments in markets that are not active, and model-based valuation techniques for which all significant assumptions are observable in the market. Level 3 – Valuation is generated from model-based techniques that use at least one significant assumption not observable in the market. These unobservable assumptions reflect estimates that market participants would use in pricing the asset or liability. Valuation includes use of discounted cash flow models and similar techniques. The fair value methods and assumptions for the Company's financial instruments and other assets measured at fair value are set forth below. Investment Securities The fair values of investment securities are estimated by independent providers using a market approach with observable inputs, including matrix pricing and recent transactions. In obtaining such valuation information from third parties, the Company has evaluated their valuation methodologies used to develop the fair values in order to determine whether the valuations are representative of an exit price in the Company's principal markets. The Company's principal markets for its securities portfolios are the secondary institutional markets, with an exit price that is predominantly reflective of bid level pricing in those markets. Fair values are calculated based on the value of one unit without regard to any premium or discount that may result from concentrations of ownership of a financial instrument, possible tax ramifications, or estimated transaction costs. If these considerations had been incorporated into the fair value estimates, the aggregate fair value could have been changed. The carrying values of restricted equity securities approximate fair values. As such, the Company classifies investment securities as Level 2. Loans Fair values are estimated for portfolios of loans are based on an exit pricing notion. The fair values of performing loans are calculated by discounting scheduled cash flows through the estimated maturity using estimated market discount rates that reflect the credit and interest risk inherent in the loan. The estimates of maturity are based on the Company's historical experience with repayments for each loan classification, modified, as required, by an estimate of the effect of current economic and lending conditions, and the effects of estimated prepayments. Assumptions regarding credit risk, cash flows, and discount rates are judgmentally determined using available market information and specific borrower information. Management has made estimates of fair value using discount rates that it believes to be reasonable. However, because there is no market for many of these financial instruments, Management has no basis to determine whether the fair value presented above would be indicative of the value negotiated in an actual sale. As such, the Company classifies loans as Level 3, except for certain collateral-dependent impaired loans. Fair values of impaired loans are based on estimated cash flows and are discounted using a rate commensurate with the risk associated with the estimated cash flows, or if collateral dependent, discounted to the appraised value of the collateral as determined by reference to sale prices of similar properties, less costs to sell. As such, the Company classifies collateral dependent impaired loans for which a specific reserve results in a fair value measure as Level 2. All other impaired loans are classified as Level 3. Other Real Estate Owned Real estate acquired through foreclosure is initially recorded at fair value. The fair value of other real estate owned is based on property appraisals and an analysis of sales prices of similar properties currently available. As such, the Company records other real estate owned as nonrecurring Level 2. Mortgage Servicing Rights Mortgage servicing rights represent the value associated with servicing residential mortgage loans. Servicing assets and servicing liabilities are reported using the amortization method and compared to fair value for impairment. In evaluating the fair values of mortgage servicing rights, the Company obtains third party valuations based on loan level data including note rate, type and term of the underlying loans. As such, the Company classifies mortgage servicing rights as Level 2. Time Deposits The fair value of maturity deposits is based on the discounted value of contractual cash flows using a replacement cost of funds approach. The discount rate is estimated using the cost of funds borrowing rate in the market. As such, the Company classifies deposits as Level 2. Borrowed Funds The fair value of borrowed funds is based on the discounted value of contractual cash flows. The discount rate is estimated using the rates currently available for borrowings of similar remaining maturities. As such, the Company classifies borrowed funds as Level 2. Derivatives The fair value of interest rate swaps is determined using inputs that are observable in the market place obtained from third parties including yield curves, publicly available volatilities, and floating indexes and, accordingly, are classified as Level 2 inputs. The credit value adjustments associated with derivatives utilize Level 3 inputs, such as estimates of current credit spreads to evaluate the likelihood of default by the Company and its counterparties. As of December 31, 2018 and 2017 , the Company has assessed the significance of the impact of the credit valuation adjustments on the overall valuation of its derivative positions and has determined that the credit valuation adjustments are not significant to the overall valuation of its derivatives due to collateral postings. Limitations Fair value estimates are made at a specific point in time, based on relevant market information and information about the financial instrument. These values do not reflect any premium or discount that could result from offering for sale at one time the Company's entire holdings of a particular financial instrument. Because no market exists for a significant portion of the Company's financial instruments, fair value estimates are based on Management's judgments regarding future expected loss experience, current economic conditions, risk characteristics of various financial instruments, and other factors. These estimates are subjective in nature and involve uncertainties and matters of significant judgment and therefore cannot be determined with precision. Changes in assumptions could significantly affect the estimates. Fair value estimates are based on existing on- and off-balance-sheet financial instruments without attempting to estimate the value of anticipated future business and the value of assets and liabilities that are not considered financial instruments. Other significant assets and liabilities that are not considered financial instruments include the deferred tax asset, premises and equipment, and other real estate owned. In addition, tax ramifications related to the realization of the unrealized gains and losses can have a significant effect on fair value estimates and have not been considered in any of the estimates. Assets and Liabilities Recorded at Fair Value on a Recurring Basis The following tables present the balances of assets and liabilities that were measured at fair value on a recurring basis as of December 31, 2018 and 2017 . At December 31, 2018 Level 1 Level 2 Level 3 Total Securities available for sale U.S. Government-sponsored agencies $ — $ 5,007,000 $ — $ 5,007,000 Mortgage-backed securities — 307,693,000 — 307,693,000 State and political subdivisions — 4,716,000 — 4,716,000 Total securities available for sale $ — $ 317,416,000 $ — $ 317,416,000 Interest rate swap agreements $ — $ 1,820,000 $ — $ 1,820,000 Total assets $ — $ 319,236,000 $ — $ 319,236,000 At December 31, 2017 Level 1 Level 2 Level 3 Total Securities available for sale Mortgage-backed securities $ — $ 289,989,000 $ — $ 289,989,000 State and political subdivisions — 6,769,000 — 6,769,000 Other equity securities — 441,000 — 441,000 Total securities available for sale $ — $ 297,199,000 $ — $ 297,199,000 Interest rate swap agreements $ — $ 1,955,000 $ — $ 1,955,000 Total assets $ — $ 299,154,000 $ — $ 299,154,000 Assets and Liabilities Recorded at Fair Value on a Non-Recurring Basis The following tables present assets measured at fair value on a nonrecurring basis that have had a fair value adjustment since their initial recognition. Other real estate owned is presented net of an allowance for losses of $0 and $53,000 at December 31, 2018 and 2017 , respectively. Only collateral-dependent impaired loans with a related specific allowance for loan losses or a partial charge off are included in impaired loans for purposes of fair value disclosures. Impaired loans below are presented net of specific allowances of $2,096,000 and $1,531,000 at December 31, 2018 and 2017 , respectively. At December 31, 2018 Level 1 Level 2 Level 3 Total Other real estate owned $ — $ 584,000 $ — $ 584,000 Impaired loans — 7,415,000 — 7,415,000 Total assets $ — $ 7,999,000 $ — $ 7,999,000 At December 31, 2017 Level 1 Level 2 Level 3 Total Other real estate owned $ — $ 1,012,000 $ — $ 1,012,000 Impaired loans — 6,521,000 — 6,521,000 Total assets $ — $ 7,533,000 $ — $ 7,533,000 Fair Value of Financial Instruments FASB ASC Topic 825, "Financial Instruments," requires disclosures of fair value information about financial instruments, whether or not recognized in the balance sheet, if the fair values can be reasonably determined. Fair value is best determined based upon quoted market prices. However, in many instances, there are no quoted market prices for the Company's various financial instruments. In cases where quoted market prices are not available, fair values are based on estimates using present value or other valuation techniques using observable inputs when available. 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 instrument. FASB ASC Topic 825 excludes certain financial instruments and all nonfinancial instruments from its disclosure requirements. Accordingly, the aggregate fair value amounts presented may not necessarily represent the underlying fair value of the Company. This summary excludes financial assets and liabilities for which carrying value approximates fair values and financial instruments that are recorded at fair value on a recurring basis. Financial instruments for which carrying values approximate fair value include cash equivalents, interest-bearing deposits in other banks, demand, NOW, savings and money market deposits. The estimated fair value of demand, NOW, savings and money market deposits is the amount payable on demand at the reporting date. Carrying value is used because the accounts have no stated maturity and the customer has the ability to withdraw funds immediately. The carrying amounts and estimated fair values for financial instruments as of December 31, 2018 were as follows: Carrying Estimated As of December 31, 2018 value fair value Level 1 Level 2 Level 3 Financial assets Securities to be held to maturity $255,663,000 $250,900,000 $ — $250,900,000 $ — Loans (net of allowance for loan losses) Commercial Real estate 349,243,000 340,526,000 — 423,000 340,103,000 Construction 27,018,000 26,344,000 — — 26,344,000 Other 192,420,000 189,842,000 — 6,096,000 183,746,000 Municipal 51,101,000 50,965,000 — — 50,965,000 Residential Term 467,760,000 451,323,000 — 793,000 450,530,000 Construction 17,705,000 17,083,000 — — 17,083,000 Home equity line of credit 97,650,000 95,175,000 — 103,000 95,072,000 Consumer 24,154,000 22,530,000 — — 22,530,000 Total loans 1,227,051,000 1,193,788,000 — 7,415,000 1,186,373,000 Mortgage servicing rights 1,354,000 2,586,000 — 2,586,000 — Financial liabilities Local certificates of deposit $284,482,000 $281,282,000 — $281,282,000 — National certificates of deposit 306,927,000 307,508,000 — 307,508,000 — Total certificates of deposit deposits 591,409,000 588,790,000 — 588,790,000 — Repurchase agreements 40,205,000 40,161,000 — 40,161,000 — Federal Home Loan Bank advances 170,112,000 169,240,000 — 169,240,000 — Total borrowed funds 210,317,000 209,401,000 — 209,401,000 — The carrying amounts and estimated fair values for financial instruments as of December 31, 2017 were as follows: Carrying Estimated As of December 31, 2017 value fair value Level 1 Level 2 Level 3 Financial assets Securities to be held to maturity $256,567,000 $259,655,000 $ — $259,655,000 $ — Loans (net of allowance for loan losses) Commercial Real estate 319,691,000 311,321,000 — 72,000 311,249,000 Construction 37,594,000 36,610,000 — — 36,610,000 Other 177,956,000 175,455,000 — 6,018,000 169,437,000 Municipal 33,370,000 33,280,000 — — 33,280,000 Residential Term 431,459,000 431,028,000 — 391,000 430,637,000 Construction 17,830,000 17,613,000 — — 17,613,000 Home equity line of credit 110,566,000 109,012,000 — 40,000 108,972,000 Consumer 24,944,000 24,408,000 — — 24,408,000 Total loans 1,153,410,000 1,138,727,000 — 6,521,000 1,132,206,000 Mortgage servicing rights 1,268,000 2,321,000 — 2,321,000 — Financial liabilities Local certificates of deposit $223,074,000 $220,734,000 $ — $220,734,000 $ — National certificates of deposit 335,927,000 335,775,000 — 335,775,000 — Total certificates of deposits 559,001,000 556,509,000 — 556,509,000 — Repurchase agreements 70,564,000 67,976,000 — 67,976,000 — Federal Home Loan Bank advances 158,194,000 156,396,000 — 156,396,000 — Total borrowed funds 228,758,000 224,372,000 — 224,372,000 —

Other Operating Income and Expe

Other Operating Income and Expense	12 Months Ended
	Dec. 31, 2018
Other Income and Expenses [Abstract]
Other Operating Income and Expense	Other Operating Income and Expense Other operating income and other operating expense include the following items greater than 1% of revenues. For the years ended December 31, 2018 2017 2016 Other operating income ATM and debit card income $ 3,556,000 $ 3,378,000 $ 3,024,000 Other operating expense Advertising and marketing expense $ 1,165,000 $ 1,208,000 $ 1,099,000 Accounting and auditing expenses 837,000 818,000 690,000 ATM and interchange expense 995,000 886,000 853,000

Legal Contingencies

Legal Contingencies	12 Months Ended
	Dec. 31, 2018
Loss Contingency [Abstract]
Legal Contingencies	Legal Contingencies

Reclassifications

Reclassifications	12 Months Ended
	Dec. 31, 2018
Prior Period Adjustment [Abstract]
Reclassifications	Reclassifications

Condensed Financial Information

Condensed Financial Information of Parent	12 Months Ended
	Dec. 31, 2018
Condensed Financial Information Disclosure [Abstract]
Condensed Financial Information of Parent	Condensed Financial Information of Parent Condensed financial information for The First Bancorp, Inc. exclusive of its subsidiary is as follows: Balance Sheets As of December 31, 2018 2017 Assets Cash and cash equivalents $ 1,190,000 $ 958,000 Dividends receivable 2,950,000 2,500,000 Investments — 441,000 Investment in subsidiary 162,763,000 152,174,000 Premises and equipment 2,000 3,000 Goodwill 27,559,000 27,559,000 Other assets 232,000 312,000 Total assets $ 194,696,000 $ 183,947,000 Liabilities and shareholders' equity Dividends payable $ 3,150,000 $ 2,599,000 Other liabilities 4,000 27,000 Total liabilities 3,154,000 2,626,000 Shareholders' equity Common stock 109,000 108,000 Additional paid-in capital 62,746,000 61,747,000 Retained earnings 128,687,000 119,373,000 Accumulated other comprehensive income Net unrealized gain on available for sale securities, net of tax — 93,000 Total accumulated other comprehensive income — 93,000 Total shareholders' equity 191,542,000 181,321,000 Total liabilities and shareholders' equity $ 194,696,000 $ 183,947,000 Statements of Income For the years ended December 31, 2018 2017 2016 Interest and dividends on investments $ — $ 15,000 $ 22,000 Net securities gains (losses) 137,000 (3,000 ) (6,000 ) Total income 137,000 12,000 16,000 Occupancy expense 2,000 5,000 9,000 Other operating expense 652,000 588,000 528,000 Total expense 654,000 593,000 537,000 Loss before income taxes and Bank earnings (517,000 ) (581,000 ) (521,000 ) Applicable income taxes (164,000 ) (187,000 ) (186,000 ) Loss before Bank earnings (353,000 ) (394,000 ) (335,000 ) Equity in earnings of Bank Remitted 11,300,000 11,180,000 11,300,000 Unremitted 12,589,000 8,802,000 7,044,000 Net income $ 23,536,000 $ 19,588,000 $ 18,009,000 Statements of Cash Flows For the years ended December 31, 2018 2017 2016 Cash flows from operating activities: Net income $ 23,536,000 $ 19,588,000 $ 18,009,000 Adjustments to reconcile net income to net cash provided by operating activities: Depreciation — 5,000 8,000 Equity compensation expense 381,000 392,000 298,000 (Gain) loss on sale of investments (137,000 ) 3,000 6,000 Tax benefit from vesting of restricted stock — — 32,000 Decrease in other assets 81,000 27,000 136,000 (Increase) decrease in dividends receivable (450,000 ) 1,300,000 (1,300,000 ) Increase (decrease) in dividends payable 551,000 (1,179,000 ) 112,000 Increase (decrease) in other liabilities — (3,000 ) (4,000 ) Unremitted earnings of Bank (12,589,000 ) (8,802,000 ) (7,044,000 ) Net cash provided by operating activities 11,373,000 11,331,000 10,253,000 Cash flows from investing activities: Proceeds from sales/maturities of investments 459,000 — 87,000 Capital expenditures 1,000 (4,000 ) — Net cash provided by (used in) investing activities 460,000 (4,000 ) 87,000 Cash flows from financing activities: Purchase of common stock (168,000 ) (154,000 ) (129,000 ) Proceeds from sale of common stock 619,000 632,000 531,000 Repurchase of warrants — — (1,750,000 ) Dividends paid (12,052,000 ) (11,460,000 ) (9,810,000 ) Net cash used in financing activities (11,601,000 ) (10,982,000 ) (11,158,000 ) Net increase (decrease) in cash and cash equivalents 232,000 345,000 (818,000 ) Cash and cash equivalents at beginning of year 958,000 613,000 1,431,000 Cash and cash equivalents at end of year $ 1,190,000 $ 958,000 $ 613,000

New Accounting Pronouncements

New Accounting Pronouncements	12 Months Ended
	Dec. 31, 2018
Accounting Policies [Abstract]
New Accounting Pronouncements	New Accounting Pronouncements The FASB issued Accounting Standards Update (“ASU”) No. 2014-09, Revenue from Contracts with Customers, in 2014 to replace the current plethora of industry-specific rules with a broad, principles-based framework for recognizing and measuring revenue. Due to the complexity of the new pronouncement and the anticipated effort required by entities in many industries to implement ASU No. 2014-09, FASB delayed the effective date. Public business entities, certain not-for-profit entities, and certain employee benefit plans should apply the guidance to annual reporting periods beginning after December 15, 2017, and all other entities should apply the guidance to annual reporting periods beginning after December 15, 2018. FASB formed a Transition Resource Group to assist it in identifying implementation issues that may require further clarification or amendment to ASU No. 2014-09. As a result of that group’s deliberations, FASB has issued the following amendments, which will be effective concurrently with ASU No. 2014-09: ASU No. 2016-08, Principal versus Agent Considerations, which clarifies whether an entity should record the gross amount of revenue or only its ultimate share when a third party is also involved in providing goods or services to a customer; ASU No. 2016-10, Identifying Performance Obligations and Licensing, which clarifies and simplifies the process for determining whether performance obligations to a customer should be segregated and accounted for individually, and clarifies how the new revenue rules apply to licenses of intellectual property; and ASU No. 2016-12, Narrow-Scope Improvements and Practical Expedients, which clarifies and simplifies the process of assessing collectability of consideration under a contract, presentation of sales taxes, accounting for noncash consideration received, and certain transitional issues. The new standard does not apply to revenue associated with financial instruments, including loans and securities that are accounted for under other U.S. GAAP. The Company has reviewed its various other revenue streams and concluded that the new standard will have minimal impact upon its consolidated financial statements. Adoption of ASU No. 2014-09 was made on January 1, 2018 utilizing the modified retrospective approach. In January 2016, the FASB issued ASU No. 2016-01, Financial Instruments - Overall: Recognition and Measurement of Financial Assets and Financial Liabilities. The ASU was issued to enhance the reporting model for financial instruments to provide users of financial statements with more decision-useful information. This ASU changes how entities account for equity investments that do not result in consolidation and are not accounted for under the equity method of accounting. The ASU also changes certain disclosure requirements and other aspects of U.S. GAAP, including a requirement for public business entities to use the exit price notion when measuring the fair value of financial instruments for disclosure purposes. The ASU became effective for fiscal years beginning after December 15, 2017, including interim periods within those fiscal years. The adoption of the ASU did not have a material effect on the Company's consolidated financial statements. In February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842). The ASU was issued to increase transparency and comparability among organizations by recognizing lease assets and lease liabilities on the balance sheet and disclosing key information about leasing arrangements. The ASU is effective for annual periods, and interim periods within those annual periods, beginning after December 15, 2018. Management is reviewing the guidance in the ASU to determine whether it will have a material effect on the Company's consolidated financial statements. In June 2016, the FASB issued ASU No. 2016-13, Financial Instruments-Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments. Under the new guidance, which will replace the existing incurred loss model for recognizing credit losses, banks and other lending institutions will be required to recognize the full amount of expected credit losses. The new guidance, which is referred to as the current expected credit loss model, requires that expected credit losses for financial assets held at the reporting date that are accounted for at amortized cost be measured and recognized based on historical experience and current and reasonably supportable forecasted conditions to reflect the full amount of expected credit losses. A modified version of these requirements also applies to debt securities classified as available for sale. The ASU is effective for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years. Early adoption is permitted for fiscal years beginning after December 15, 2018, including interim periods within such years. The Company is currently evaluating the impact of the adoption of the ASU on its consolidated financial statements, and anticipates it may have a material impact. The Bank has formed an implementation committee for ASU No. 2016-13. To date, committee members have participated in educational seminars on the new standards, begun the process of identifying the historical data sets that will be necessary to implement the new standard, and have chosen a third-party vendor who provides software solutions for ASU No. 2016-13 modeling and calculation. Implementation of this software is in process. In January 2017, the FASB issued ASU No. 2017-04, Intangibles - Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment. The ASU was issued to reduce the cost and complexity of the goodwill impairment test. To simplify the subsequent measurement of goodwill, step two of the goodwill impairment test was eliminated. Instead, a Company will recognize an impairment of goodwill should the carrying value of a reporting unit exceed its fair value (i.e. step one). The ASU will be effective for the Company on January 1, 2020 and will be applied prospectively. The Company does not expect the implementation to have a material effect on the Company's consolidated financial statements. In March 2017, the FASB issued ASU No. 2017-08, Premium Amortization on Purchased Callable Debt Securities. This ASU shortens the amortization period for the premium on certain purchased callable debt securities to the earliest call date. Today, many entities amortize the premium over the contractual life of the security. The new guidance does not change the accounting for purchased callable debt securities held at a discount; the discount continues to be accreted to maturity. The ASU is effective for interim and annual reporting periods beginning after December 15, 2018; early adoption is permitted. The guidance calls for a modified retrospective transition approach under which a cumulative-effect adjustment will be made to retained earnings as of the beginning of the first reporting period in which the guidance is adopted. The Company's current practice aligns with the ASU; therefore Management believes there will be no impact on the Company's consolidated financial statements. In May 2017, the FASB issued ASU No. 2017-09, Compensation-Stock Compensation (Topic 718): Scope of Modification Accounting. The ASU was issued to provide clarity and reduce both 1) diversity in practice and 2) cost and complexity when applying the guidance in Topic 718, Compensation-Stock Compensation, to a change to the terms or conditions of a shared-based payment award. The ASU includes guidance on determining which changes to the terms and conditions of share-based payment awards require and entity to apply modification accounting under Topic 718. The ASU is effective for the annual period, and interim periods within the annual periods, beginning after December 15, 2017. Early adoption is permitted, including adoption in any interim period. The ASU should be applied prospectively to an award modified on or after the adoption date. Adoption of the ASU did not have a material effect on the Company's consolidated financial statements. In August 2017, the FASB issued ASU 2017-12, Derivatives and Hedging (Topic 815). The amendments in this ASU improve the financial reporting of hedging relationships to better portray the economic results of an entity's risk management activities in its financial statements. In addition, this ASU makes certain targeted improvements to simplify the application of the hedge accounting guidance in current US GAAP. The amendments in this ASU are effective for fiscal years beginning after December 15, 2018, and interim periods within those fiscal years. Early application is permitted in any interim period after issuance of the ASU. Management is reviewing the guidance in this ASU to determine whether it will have a material effect on the Company's consolidated financial statements. In February 2018, the FASB issued ASU No. 2018-02, Income Statement - Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income (Loss). This ASU was issued to allow a reclassification from accumulated other comprehensive income (loss) to retained earnings for stranded tax effects resulting from the Tax Cuts and Jobs Act. Consequently, the amendments eliminate the stranded tax effects resulting from the Tax Cuts and Jobs Act and will improve the usefulness of information reported to financial statement users. However, because the amendments only relate to the reclassification of the income tax effects of the Tax Cuts and Jobs Act, the underlying guidance that requires that the effect of a change in tax laws or rates be included in income from continuing operations is not affected. The ASU is effective for fiscal years beginning after December 15, 2018, with early adoption permitted for financial statements which have not yet been issued. The Company adopted the ASU for the December 31, 2017 consolidated financial statements, which resulted in a reclassification adjustment on the Consolidated Statements of Changes in Shareholders' Equity of $297,000 from accumulated other comprehensive income (loss) to retained earnings. Refer to Note 9, Income Taxes, in the Company's December 31, 2017 Form 10-K for additional information. In July 2018, the FASB issued ASU No. 2018-11, Leases - Targeted Improvements to provide entities with relief from the costs of implementing certain aspects of the new leasing standard, ASU No. 2016-02. Specifically, under the amendments in ASU 2018-11: (1) entities may elect not to recast the comparative periods presented when transitioning to the new leasing standard, and (2) lessors may elect not to separate lease and non-lease components when certain conditions are met. The amendments have the same effective date as ASU 2016-02. The Company expects to elect both transition options. The adoption of ASU 2018-11 will not have a material effect on the Company’s consolidated financial statements. In August 2018, the FASB issued ASU No. 2018-13, Disclosure Framework - Changes to the Disclosure Requirements for Fair Value Measurement. This ASU eliminates, adds and modifies certain disclosure requirements for fair value measurements. Among the changes, entities will no longer be required to disclose the amount of and reasons for transfers between Level 1 and Level 2 of the fair value hierarchy, but will be required to disclose the range and weighted average used to develop significant unobservable inputs for Level 3 fair value measurements. ASU No. 2018-13 is effective for interim and annual reporting periods beginning after December 15, 2019; early adoption is permitted. Entities are also allowed to elect early adoption of the eliminated or modified disclosure requirements and delay adoption of the new disclosure requirements until their effective date. As ASU No. 2018-13 only revises disclosure requirements, it will not have a material impact on the Company’s consolidated financial statements. In August 2018, the FASB issued ASU No. 2018-14, Disclosure Framework - Changes to the Disclosure Requirements for Defined Benefit Plans .

Quarterly Information

Quarterly Information	12 Months Ended
	Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract]
Quarterly Information	Quarterly Information The following tables provide unaudited financial information by quarter for each of the past two years: Dollars in thousands except per share data 2017Q1 2017Q2 2017Q3 2017Q4 2018Q1 2018Q2 2018Q3 2018Q4 Balance Sheets Cash and cash equivalents $ 17,600 $ 23,718 $ 22,375 $ 19,207 $ 16,559 $ 21,056 $ 21,649 $ 19,134 Interest-bearing deposits in other banks 3,272 291 584 860 280 1,616 51,045 12,079 Investments 553,453 552,269 541,678 553,766 562,459 565,125 562,839 573,079 Restricted equity securities 13,363 12,311 10,798 10,358 11,947 12,363 11,586 11,586 Net loans and loans held for sale 1,080,347 1,110,919 1,110,508 1,153,796 1,177,329 1,213,449 1,233,010 1,227,051 Other assets 95,793 96,143 95,758 104,943 103,241 100,352 101,725 101,641 Total assets $ 1,763,828 $ 1,795,651 $ 1,781,701 $ 1,842,930 $ 1,871,815 $ 1,913,961 $ 1,981,854 $ 1,944,570 Deposits $ 1,346,483 $ 1,319,259 $ 1,350,049 $ 1,418,879 $ 1,428,192 $ 1,416,646 $ 1,514,911 $ 1,527,085 Borrowed funds 226,467 282,277 234,328 228,758 244,229 297,455 265,274 210,317 Other liabilities 15,968 16,578 17,442 13,972 18,022 16,556 17,008 15,626 Shareholders' equity 174,910 177,537 179,882 181,321 181,372 183,304 184,661 191,542 Total liabilities & equity $ 1,763,828 $ 1,795,651 $ 1,781,701 $ 1,842,930 $ 1,871,815 $ 1,913,961 $ 1,981,854 $ 1,944,570 Income and Comprehensive Income Statements Interest income $ 14,491 $ 15,002 $ 15,517 $ 15,822 $ 16,451 $ 17,205 $ 18,086 $ 18,801 Interest expense 3,015 3,337 3,563 3,614 4,042 4,936 5,550 5,806 Net interest income 11,476 11,665 11,954 12,208 12,409 12,269 12,536 12,995 Provision for loan losses 500 500 750 250 500 500 333 167 Net interest income after provision for loan losses 10,976 11,165 11,204 11,958 11,909 11,769 12,203 12,828 Non-interest income 2,843 3,002 3,493 3,210 3,132 3,181 3,034 3,253 Non-interest expense 7,698 7,640 8,013 8,300 8,579 8,176 8,216 8,496 Income before taxes 6,121 6,527 6,684 6,868 6,462 6,774 7,021 7,585 Income taxes 1,484 1,644 1,702 1,782 956 1,040 1,088 1,222 Net income $ 4,637 $ 4,883 $ 4,982 $ 5,086 $ 5,506 $ 5,734 $ 5,933 $ 6,363 Basic earnings per share $ 0.43 $ 0.45 $ 0.46 $ 0.48 $ 0.51 $ 0.53 $ 0.55 $ 0.59 Diluted earnings per share $ 0.43 $ 0.45 $ 0.46 $ 0.47 $ 0.51 $ 0.53 $ 0.55 $ 0.58 Other comprehensive income (loss), net of tax Net unrealized gain (loss) on securities available for sale $ 1 $ 349 $ (240 ) $ (1,562 ) $ (3,309 ) $ (1,035 ) $ (1,888 ) $ 4,082 Net unrealized loss on securities transfered from available for sale to held to maturity (4 ) (4 ) (3 ) (3 ) (8 ) (7 ) (5 ) (3 ) Net unrealized gain (loss) on cash flow hedging derivative instruments 63 (171 ) (20 ) 235 384 138 216 (844 ) Unrecognized gain (loss) on postretirement benefit costs — — — (19 ) — — — 184 Other comprehensive income (loss) $ 60 $ 174 $ (263 ) $ (1,349 ) $ (2,933 ) $ (904 ) $ (1,677 ) $ 3,419 Comprehensive income $ 4,697 $ 5,057 $ 4,719 $ 3,737 $ 2,573 $ 4,830 $ 4,256 $ 9,782

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2018
Accounting Policies [Abstract]
Principles of Consolidation	Principles of ConsolidationThe consolidated financial statements include the accounts of the Company and the Bank. All intercompany accounts and transactions have been eliminated in consolidation.
Subsequent Events	Subsequent Events Events occurring subsequent to December 31, 2018
Use of Estimates in Preparation of Financial Statements	Use of Estimates in Preparation of Financial StatementsIn preparing the financial statements in accordance with accounting principles generally accepted in the United States of America ("GAAP"), 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 balance sheet and revenues and expenses for the reporting period. Actual results could differ significantly from those estimates. Material estimates that are particularly susceptible to significant change in the near-term relate to the determination of the allowance for loan losses, goodwill, the valuation of mortgage servicing rights, and other-than-temporary impairment of securities.
Investment Securities	Investment SecuritiesInvestment securities are classified as available for sale or held to maturity when purchased. There are no trading account securities. Securities available for sale consist primarily of debt securities which Management intends to hold for indefinite periods of time. They may be used as part of the Bank's funds management strategy, and may be sold in response to changes in interest rates or prepayment risk, changes in liquidity needs, or for other reasons. They are accounted for at fair value, with unrealized gains or losses adjusted through shareholders' equity, net of related income taxes. The cost basis is adjusted for the amortization of premiums and accretion of discounts, computed using the effective interest method over the securities' contractual lives. Securities to be held to maturity consist primarily of debt securities which Management has acquired solely for long-term investment purposes, rather than for purposes of trading or future sale. For securities to be held to maturity, Management has the intent and the Bank has the ability to hold such securities until their respective maturity dates. Such securities are carried at cost adjusted for the amortization of premiums and accretion of discounts, computed using the effective interest method over the securities' contractual lives. Investment securities transactions are accounted for on a settlement date basis; reported amounts would not be materially different from those accounted for on a trade date basis. Gains and losses on the sales of investment securities are determined using the amortized cost of the specifically identified security. For declines in the fair value of individual debt securities available for sale below their cost that are deemed to be other than temporary, where the Bank does not intend to sell the security and it is more likely than not that the Bank will not be required to sell the security before recovery of its amortized cost basis, the other-than-temporary decline in the fair value of the debt security related to 1) credit loss is recognized in earnings and 2) other factors is recognized in other comprehensive income or loss. Credit loss is deemed to exist if the present value of expected future cash flows using the effective rate at acquisition is less than the amortized cost basis of the debt security. For individual debt securities where the Bank intends to sell the security or more likely than not will be required to sell the security before recovery of its amortized cost, the other-than-temporary impairment is recognized in earnings equal to the entire difference between the security's cost basis and its fair value at the balance sheet date.
Derivative Financial Instruments Designated as Hedges	Derivative Financial Instruments Designated as Hedges The Company recognizes all derivatives in the consolidated balance sheets at fair value. On the date the Bank enters into the derivative contract, the Company designates the derivative as a hedge of either a forecasted transaction or the variability of cash flows to be received or paid related to a recognized asset or liability (“cash flow hedge”), a hedge of the fair value of a recognized asset or liability or of an unrecognized firm commitment (“fair value hedge”), or a held for trading instrument (“trading instrument”). The Bank formally documents relationships between hedging instruments and hedged items, as well as its risk management objectives and strategy for undertaking various hedge transactions. The Company also assesses, both at the hedge’s inception and on an ongoing basis, whether the derivatives that are used in hedging transactions are effective in offsetting changes in cash flows or fair values of hedged items. Changes in fair value of a derivative that is effective and that qualifies as a cash flow hedge are recorded in other comprehensive income (loss) and are reclassified into earnings when the forecasted transaction or related cash flows affect earnings. Changes in fair value of a derivative that qualifies as a fair value hedge and the change in fair value of the hedged item are both recorded in earnings and offset each other when the transaction is effective. Those derivatives that are classified as trading instruments are recorded at fair value with changes in fair value recorded in earnings. The Company discontinues hedge accounting when it determines that the derivative is no longer effective in offsetting changes in the cash flows of the hedged item, that it is unlikely that the forecasted transaction will occur, or that the designation of the derivative as a hedging
Loans Held for Sale	Loans Held for SaleLoans held for sale consist of residential real estate mortgage loans and are carried at the lower of aggregate cost or fair value, as determined by current investor yield requirements.
Loans	LoansLoans are generally reported at their outstanding principal balances, adjusted for chargeoffs, the allowance for loan losses and any deferred fees or costs to originate loans. Loan commitments are recorded when funded.
Loan Fees and Costs	Loan Fees and CostsLoan origination fees and certain direct loan origination costs are deferred and recognized in interest income as an adjustment to the loan yield over the life of the related loans. The unamortized net deferred fees and costs are included on the balance sheets with the related loan balances, and the amortization is included with the related interest income.
Allowance for Loan Losses	Allowance for Loan LossesLoans considered to be uncollectible are charged against the allowance for loan losses. The allowance for loan losses is maintained at a level determined by Management to be appropriate to absorb probable losses. This allowance is increased by provisions charged to operating expenses and recoveries on loans previously charged off. Arriving at an appropriate level of allowance for loan losses necessarily involves a high degree of judgment. In determining the appropriate level of allowance for loan losses, Management takes into consideration several factors, including reviews of individual non-performing loans and performing loans listed on the watch report requiring periodic evaluation, loan portfolio size by category, recent loss experience, delinquency trends and current economic conditions. For all loan classes, loans over 30 days past due are considered delinquent. Impaired loans include restructured loans and loans placed on non-accrual status when, based on current information and events, it is probable that the Bank will be unable to collect all amounts due according to the contractual terms of the loan agreement. These loans are measured at the present value of expected future cash flows discounted at the loan's effective interest rate or at the fair value of the collateral if the loan is collateral dependent. Management takes into consideration impaired loans in addition to the above mentioned factors in determining the appropriate level of allowance for loan losses.
Troubled Debt Restructured	Troubled Debt RestructuredA troubled debt restructured ("TDR") constitutes a restructuring of debt if the Bank, for economic or legal reasons related to the borrower's financial difficulties, grants a concession to the borrower that it would not otherwise consider. To determine whether or not a loan should be classified as a TDR, Management evaluates a loan to first determine if the borrower demonstrates financial difficulty. Common indicators of this include past due status with bank obligations, substandard credit bureau reports, or an inability to refinance with another lender. If the borrower is experiencing financial difficulty and concessions are granted, such as maturity date extension, interest rate adjustments to below market pricing, or a deferral of payments, the loan will generally be classified as a TDR.
Accrual of Interest Income and Expense	Accrual of Interest Income and ExpenseInterest on loans and investment securities is taken into income using methods which relate the income earned to the balances of loans and investment securities outstanding. Interest expense on liabilities is derived by applying applicable interest rates to principal amounts outstanding. For all classes of loans, recording of interest income on problem loans, which includes impaired loans, ceases when collectibility of principal and interest within a reasonable period of time becomes doubtful. Cash payments received on non-accrual loans, which includes impaired loans, are applied to reduce the loan's principal balance until the remaining principal balance is deemed collectible, after which interest is recognized when collected. As a general rule, a loan may be restored to accrual status when payments are current for a substantial period of time, generally six months, and repayment of the remaining contractual amounts is expected or when it otherwise becomes well secured and in the process of collection.
Premises and Equipment	Premises and EquipmentPremises, furniture and equipment are stated at cost, less accumulated depreciation. Depreciation expense is computed by straight-line methods over the asset's estimated useful life.
Other Real Estate Owned (OREO)	Other Real Estate Owned ("OREO")Real estate acquired by foreclosure or deed in lieu of foreclosure is transferred to OREO and recorded at fair value, less estimated costs to sell, based on appraised value at the date actually or constructively received. Loan losses arising from the acquisition of such property are charged against the allowance for loan losses. Subsequent provisions to reduce the carrying value of a property are recorded to the allowance for OREO losses and a charge to operations on a property specific basis.
Goodwill and Identified Intangible Assets	Goodwill and Identified Intangible Assets Intangible assets include the excess of the purchase price over the fair value of net assets acquired (goodwill) from the acquisition of FNB Bankshares in 2005 as well as the core deposit intangible related to the same acquisition. The core deposit intangible related to this acquisition was fully amortized in 2015. Intangible assets also include the goodwill and core deposit intangible from the 2012 acquisition of a bank branch in Rockland, Maine and a bank building in Bangor, Maine. The core deposit intangible will be amortized on a straight-line basis over ten years . Annual amortization expense for each of 2018 , 2017 and 2016 was $43,000 , and the amortization expense for each year until fully amortized (presently expected to be 2022) will be $43,000 . The straight-line basis is used because the Company does not expect significant run off in the core deposits acquired. The Company annually evaluates goodwill, and periodically evaluates other intangible assets, for impairment. At December 31, 2018
Income Taxes	Income TaxesDeferred tax assets and liabilities are recognized for the future tax consequences attributable to differences between financial statement carrying amounts of assets and liabilities and their respective tax bases, and for tax credits that are available to offset future taxable income. 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 of a change in tax rates on deferred tax assets and liabilities is recognized in income in the period the change is enacted
Loan Servicing	Loan Servicing Servicing rights are recognized when they are acquired through sale of loans. Capitalized servicing rights are reported in other assets and are amortized into non-interest income in proportion to, and over the period of, the estimated future net servicing income of the underlying financial assets. Servicing rights are evaluated for impairment based upon the fair value of the rights as compared to amortized cost. Impairment is determined by stratifying rights by predominant characteristics, such as interest rates and terms. Impairment is recognized through a valuation allowance for an individual stratum, to the extent that fair value is less than the capitalized amount for the stratum.
Post-Retirement Benefits	Post-Retirement Benefits The cost of providing post-retirement benefits is accrued during the active service period of the employee or director.
Earnings Per Share	Earnings Per Share Basic earnings per share data are based on the weighted average number of common shares outstanding during each year. Diluted earnings per share gives effect to restricted stock granted and stock options and warrants outstanding, determined by the treasury stock method.
Comprehensive Income (Loss)	Comprehensive Income (Loss)Comprehensive income (loss) includes net income and other comprehensive income (loss), which is comprised of the change in unrealized gains and losses on securities available for sale, net of tax, change in unrealized losses on securities transferred from available for sale to held to maturity, net of amortization, change in unrealized gain on cash flow hedging derivative instruments, net of tax, and unrecognized gains and losses related to post-retirement benefit costs, net of tax.
Segments	Segments The First Bancorp, Inc., through the branches of its subsidiary, First National Bank, provides a broad range of financial services to individuals and companies in coastal Maine. These services include demand, time, and savings deposits; lending; ATM processing; and investment management and trust services. Operations are managed and financial performance is evaluated on a corporate-wide basis. Accordingly, all of the Company's banking operations are considered by Management to be aggregated in one reportable operating segment.
Financial Derivative Instruments	As part of its overall asset and liability management strategy, the Company periodically uses derivative instruments to mitigate significant unplanned fluctuations in earnings and cash flows caused by interest rate volatility. The Company’s interest rate risk management strategy involves modifying the re-pricing characteristics of certain assets or liabilities so that changes in interest rates do not have a significant effect on net interest income. The Company recognizes its derivative instruments in the consolidated balance sheet at fair value. On the date the derivative instrument is entered into, the Company designates whether the derivative is part of a hedging relationship (i.e., cash flow or fair value hedge). The Company formally documents relationships between hedging instruments and hedged items, as well as its risk management objective and strategy for undertaking hedge transactions. The Company also assesses, both at the hedge’s inception and on an ongoing basis, whether the derivatives used in hedging transactions are highly effective in offsetting the changes in cash flows or fair values of hedged items. Changes in fair value of derivative instruments that are highly effective and qualify as cash flow hedges are recorded in other comprehensive income or loss. Any ineffective portion is recorded in earnings. The Company discontinues hedge accounting when it is determined that the derivative is no longer highly effective in offsetting changes of the hedged risk on the hedged item, or management determines that the designation of the derivative as a hedging instrument is no longer appropriate.
Reclassifications	Reclassifications
Fair Value Measurement	Certain assets and liabilities are recorded at fair value to provide additional insight into the Company's quality of earnings. Some of these assets and liabilities are measured on a recurring basis while others are measured on a nonrecurring basis, with the determination based upon applicable existing accounting pronouncements. For example, securities available for sale are recorded at fair value on a recurring basis. Other assets, such as mortgage servicing rights, loans held for sale, and impaired loans, are recorded at fair value on a nonrecurring basis using the lower of cost or market methodology to determine impairment of individual assets. The Company groups assets and liabilities which are recorded at fair value in three levels, based on the markets in which the assets and liabilities are traded and the reliability of the assumptions used to determine fair value. A financial instrument's level within the fair value hierarchy is based on the lowest level of input that is significant to the fair value measurement (with level 1 considered highest and level 3 considered lowest). A brief description of each level follows. Level 1 – Valuation is based upon quoted prices for identical instruments in active markets. Level 2 – Valuation is based upon quoted prices for similar instruments in active markets, quoted prices for identical or similar instruments in markets that are not active, and model-based valuation techniques for which all significant assumptions are observable in the market. Level 3
Fair Value of Financial Instruments	The fair value methods and assumptions for the Company's financial instruments and other assets measured at fair value are set forth below. Investment Securities The fair values of investment securities are estimated by independent providers using a market approach with observable inputs, including matrix pricing and recent transactions. In obtaining such valuation information from third parties, the Company has evaluated their valuation methodologies used to develop the fair values in order to determine whether the valuations are representative of an exit price in the Company's principal markets. The Company's principal markets for its securities portfolios are the secondary institutional markets, with an exit price that is predominantly reflective of bid level pricing in those markets. Fair values are calculated based on the value of one unit without regard to any premium or discount that may result from concentrations of ownership of a financial instrument, possible tax ramifications, or estimated transaction costs. If these considerations had been incorporated into the fair value estimates, the aggregate fair value could have been changed. The carrying values of restricted equity securities approximate fair values. As such, the Company classifies investment securities as Level 2. Loans Fair values are estimated for portfolios of loans are based on an exit pricing notion. The fair values of performing loans are calculated by discounting scheduled cash flows through the estimated maturity using estimated market discount rates that reflect the credit and interest risk inherent in the loan. The estimates of maturity are based on the Company's historical experience with repayments for each loan classification, modified, as required, by an estimate of the effect of current economic and lending conditions, and the effects of estimated prepayments. Assumptions regarding credit risk, cash flows, and discount rates are judgmentally determined using available market information and specific borrower information. Management has made estimates of fair value using discount rates that it believes to be reasonable. However, because there is no market for many of these financial instruments, Management has no basis to determine whether the fair value presented above would be indicative of the value negotiated in an actual sale. As such, the Company classifies loans as Level 3, except for certain collateral-dependent impaired loans. Fair values of impaired loans are based on estimated cash flows and are discounted using a rate commensurate with the risk associated with the estimated cash flows, or if collateral dependent, discounted to the appraised value of the collateral as determined by reference to sale prices of similar properties, less costs to sell. As such, the Company classifies collateral dependent impaired loans for which a specific reserve results in a fair value measure as Level 2. All other impaired loans are classified as Level 3. Other Real Estate Owned Real estate acquired through foreclosure is initially recorded at fair value. The fair value of other real estate owned is based on property appraisals and an analysis of sales prices of similar properties currently available. As such, the Company records other real estate owned as nonrecurring Level 2. Mortgage Servicing Rights Mortgage servicing rights represent the value associated with servicing residential mortgage loans. Servicing assets and servicing liabilities are reported using the amortization method and compared to fair value for impairment. In evaluating the fair values of mortgage servicing rights, the Company obtains third party valuations based on loan level data including note rate, type and term of the underlying loans. As such, the Company classifies mortgage servicing rights as Level 2. Time Deposits The fair value of maturity deposits is based on the discounted value of contractual cash flows using a replacement cost of funds approach. The discount rate is estimated using the cost of funds borrowing rate in the market. As such, the Company classifies deposits as Level 2. Borrowed Funds The fair value of borrowed funds is based on the discounted value of contractual cash flows. The discount rate is estimated using the rates currently available for borrowings of similar remaining maturities. As such, the Company classifies borrowed funds as Level 2. Derivatives The fair value of interest rate swaps is determined using inputs that are observable in the market place obtained from third parties including yield curves, publicly available volatilities, and floating indexes and, accordingly, are classified as Level 2 inputs. The credit value adjustments associated with derivatives utilize Level 3 inputs, such as estimates of current credit spreads to evaluate the likelihood of default by the Company and its counterparties. As of December 31, 2018 and 2017 , the Company has assessed the significance of the impact of the credit valuation adjustments on the overall valuation of its derivative positions and has determined that the credit valuation adjustments are not significant to the overall valuation of its derivatives due to collateral postings. Limitations
New Accounting Pronouncements	New Accounting Pronouncements The FASB issued Accounting Standards Update (“ASU”) No. 2014-09, Revenue from Contracts with Customers, in 2014 to replace the current plethora of industry-specific rules with a broad, principles-based framework for recognizing and measuring revenue. Due to the complexity of the new pronouncement and the anticipated effort required by entities in many industries to implement ASU No. 2014-09, FASB delayed the effective date. Public business entities, certain not-for-profit entities, and certain employee benefit plans should apply the guidance to annual reporting periods beginning after December 15, 2017, and all other entities should apply the guidance to annual reporting periods beginning after December 15, 2018. FASB formed a Transition Resource Group to assist it in identifying implementation issues that may require further clarification or amendment to ASU No. 2014-09. As a result of that group’s deliberations, FASB has issued the following amendments, which will be effective concurrently with ASU No. 2014-09: ASU No. 2016-08, Principal versus Agent Considerations, which clarifies whether an entity should record the gross amount of revenue or only its ultimate share when a third party is also involved in providing goods or services to a customer; ASU No. 2016-10, Identifying Performance Obligations and Licensing, which clarifies and simplifies the process for determining whether performance obligations to a customer should be segregated and accounted for individually, and clarifies how the new revenue rules apply to licenses of intellectual property; and ASU No. 2016-12, Narrow-Scope Improvements and Practical Expedients, which clarifies and simplifies the process of assessing collectability of consideration under a contract, presentation of sales taxes, accounting for noncash consideration received, and certain transitional issues. The new standard does not apply to revenue associated with financial instruments, including loans and securities that are accounted for under other U.S. GAAP. The Company has reviewed its various other revenue streams and concluded that the new standard will have minimal impact upon its consolidated financial statements. Adoption of ASU No. 2014-09 was made on January 1, 2018 utilizing the modified retrospective approach. In January 2016, the FASB issued ASU No. 2016-01, Financial Instruments - Overall: Recognition and Measurement of Financial Assets and Financial Liabilities. The ASU was issued to enhance the reporting model for financial instruments to provide users of financial statements with more decision-useful information. This ASU changes how entities account for equity investments that do not result in consolidation and are not accounted for under the equity method of accounting. The ASU also changes certain disclosure requirements and other aspects of U.S. GAAP, including a requirement for public business entities to use the exit price notion when measuring the fair value of financial instruments for disclosure purposes. The ASU became effective for fiscal years beginning after December 15, 2017, including interim periods within those fiscal years. The adoption of the ASU did not have a material effect on the Company's consolidated financial statements. In February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842). The ASU was issued to increase transparency and comparability among organizations by recognizing lease assets and lease liabilities on the balance sheet and disclosing key information about leasing arrangements. The ASU is effective for annual periods, and interim periods within those annual periods, beginning after December 15, 2018. Management is reviewing the guidance in the ASU to determine whether it will have a material effect on the Company's consolidated financial statements. In June 2016, the FASB issued ASU No. 2016-13, Financial Instruments-Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments. Under the new guidance, which will replace the existing incurred loss model for recognizing credit losses, banks and other lending institutions will be required to recognize the full amount of expected credit losses. The new guidance, which is referred to as the current expected credit loss model, requires that expected credit losses for financial assets held at the reporting date that are accounted for at amortized cost be measured and recognized based on historical experience and current and reasonably supportable forecasted conditions to reflect the full amount of expected credit losses. A modified version of these requirements also applies to debt securities classified as available for sale. The ASU is effective for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years. Early adoption is permitted for fiscal years beginning after December 15, 2018, including interim periods within such years. The Company is currently evaluating the impact of the adoption of the ASU on its consolidated financial statements, and anticipates it may have a material impact. The Bank has formed an implementation committee for ASU No. 2016-13. To date, committee members have participated in educational seminars on the new standards, begun the process of identifying the historical data sets that will be necessary to implement the new standard, and have chosen a third-party vendor who provides software solutions for ASU No. 2016-13 modeling and calculation. Implementation of this software is in process. In January 2017, the FASB issued ASU No. 2017-04, Intangibles - Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment. The ASU was issued to reduce the cost and complexity of the goodwill impairment test. To simplify the subsequent measurement of goodwill, step two of the goodwill impairment test was eliminated. Instead, a Company will recognize an impairment of goodwill should the carrying value of a reporting unit exceed its fair value (i.e. step one). The ASU will be effective for the Company on January 1, 2020 and will be applied prospectively. The Company does not expect the implementation to have a material effect on the Company's consolidated financial statements. In March 2017, the FASB issued ASU No. 2017-08, Premium Amortization on Purchased Callable Debt Securities. This ASU shortens the amortization period for the premium on certain purchased callable debt securities to the earliest call date. Today, many entities amortize the premium over the contractual life of the security. The new guidance does not change the accounting for purchased callable debt securities held at a discount; the discount continues to be accreted to maturity. The ASU is effective for interim and annual reporting periods beginning after December 15, 2018; early adoption is permitted. The guidance calls for a modified retrospective transition approach under which a cumulative-effect adjustment will be made to retained earnings as of the beginning of the first reporting period in which the guidance is adopted. The Company's current practice aligns with the ASU; therefore Management believes there will be no impact on the Company's consolidated financial statements. In May 2017, the FASB issued ASU No. 2017-09, Compensation-Stock Compensation (Topic 718): Scope of Modification Accounting. The ASU was issued to provide clarity and reduce both 1) diversity in practice and 2) cost and complexity when applying the guidance in Topic 718, Compensation-Stock Compensation, to a change to the terms or conditions of a shared-based payment award. The ASU includes guidance on determining which changes to the terms and conditions of share-based payment awards require and entity to apply modification accounting under Topic 718. The ASU is effective for the annual period, and interim periods within the annual periods, beginning after December 15, 2017. Early adoption is permitted, including adoption in any interim period. The ASU should be applied prospectively to an award modified on or after the adoption date. Adoption of the ASU did not have a material effect on the Company's consolidated financial statements. In August 2017, the FASB issued ASU 2017-12, Derivatives and Hedging (Topic 815). The amendments in this ASU improve the financial reporting of hedging relationships to better portray the economic results of an entity's risk management activities in its financial statements. In addition, this ASU makes certain targeted improvements to simplify the application of the hedge accounting guidance in current US GAAP. The amendments in this ASU are effective for fiscal years beginning after December 15, 2018, and interim periods within those fiscal years. Early application is permitted in any interim period after issuance of the ASU. Management is reviewing the guidance in this ASU to determine whether it will have a material effect on the Company's consolidated financial statements. In February 2018, the FASB issued ASU No. 2018-02, Income Statement - Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income (Loss). This ASU was issued to allow a reclassification from accumulated other comprehensive income (loss) to retained earnings for stranded tax effects resulting from the Tax Cuts and Jobs Act. Consequently, the amendments eliminate the stranded tax effects resulting from the Tax Cuts and Jobs Act and will improve the usefulness of information reported to financial statement users. However, because the amendments only relate to the reclassification of the income tax effects of the Tax Cuts and Jobs Act, the underlying guidance that requires that the effect of a change in tax laws or rates be included in income from continuing operations is not affected. The ASU is effective for fiscal years beginning after December 15, 2018, with early adoption permitted for financial statements which have not yet been issued. The Company adopted the ASU for the December 31, 2017 consolidated financial statements, which resulted in a reclassification adjustment on the Consolidated Statements of Changes in Shareholders' Equity of $297,000 from accumulated other comprehensive income (loss) to retained earnings. Refer to Note 9, Income Taxes, in the Company's December 31, 2017 Form 10-K for additional information. In July 2018, the FASB issued ASU No. 2018-11, Leases - Targeted Improvements to provide entities with relief from the costs of implementing certain aspects of the new leasing standard, ASU No. 2016-02. Specifically, under the amendments in ASU 2018-11: (1) entities may elect not to recast the comparative periods presented when transitioning to the new leasing standard, and (2) lessors may elect not to separate lease and non-lease components when certain conditions are met. The amendments have the same effective date as ASU 2016-02. The Company expects to elect both transition options. The adoption of ASU 2018-11 will not have a material effect on the Company’s consolidated financial statements. In August 2018, the FASB issued ASU No. 2018-13, Disclosure Framework - Changes to the Disclosure Requirements for Fair Value Measurement. This ASU eliminates, adds and modifies certain disclosure requirements for fair value measurements. Among the changes, entities will no longer be required to disclose the amount of and reasons for transfers between Level 1 and Level 2 of the fair value hierarchy, but will be required to disclose the range and weighted average used to develop significant unobservable inputs for Level 3 fair value measurements. ASU No. 2018-13 is effective for interim and annual reporting periods beginning after December 15, 2019; early adoption is permitted. Entities are also allowed to elect early adoption of the eliminated or modified disclosure requirements and delay adoption of the new disclosure requirements until their effective date. As ASU No. 2018-13 only revises disclosure requirements, it will not have a material impact on the Company’s consolidated financial statements. In August 2018, the FASB issued ASU No. 2018-14, Disclosure Framework - Changes to the Disclosure Requirements for Defined Benefit Plans .

Investment Securities (Tables)

Investment Securities (Tables)	12 Months Ended
	Dec. 31, 2018
Investments, Debt and Equity Securities [Abstract]
Schedule of Available For Sale, Held-to-Maturity, and Restricted Equity Securities	The following tables summarize the amortized cost and estimated fair value of investment securities at December 31, 2018 and 2017 : Amortized Unrealized Unrealized Fair Value As of December 31, 2018 Cost Gains Losses (Estimated) Securities available for sale U.S. government-sponsored agencies $ 5,000,000 $ 7,000 $ — $ 5,007,000 Mortgage-backed securities 313,854,000 571,000 (6,732,000) 307,693,000 State and political subdivisions 4,955,000 — (239,000 ) 4,716,000 $ 323,809,000 $ 578,000 $ (6,971,000 ) $ 317,416,000 Securities to be held to maturity U.S. Government-sponsored agencies $ 11,155,000 $ — $ (472,000 ) $ 10,683,000 Mortgage-backed securities 18,250,000 336,000 (255,000 ) 18,331,000 State and political subdivisions 221,958,000 1,046,000 (5,418,000 ) 217,586,000 Corporate securities 4,300,000 — — 4,300,000 $ 255,663,000 $ 1,382,000 $ (6,145,000 ) $ 250,900,000 Restricted equity securities Federal Home Loan Bank Stock $ 10,549,000 $ — $ — $ 10,549,000 Federal Reserve Bank Stock 1,037,000 — — 1,037,000 $ 11,586,000 $ — $ — $ 11,586,000 Amortized Unrealized Unrealized Fair Value As of December 31, 2017 Cost Gains Losses (Estimated) Securities available for sale Mortgage-backed securities $ 293,689,000 $ 722,000 $ (4,422,000 ) $ 289,989,000 State and political subdivisions 6,860,000 16,000 (107,000 ) 6,769,000 Other equity securities 323,000 121,000 (3,000 ) 441,000 $ 300,872,000 $ 859,000 $ (4,532,000 ) $ 297,199,000 Securities to be held to maturity U.S. Government-sponsored agencies $ 11,155,000 $ — $ (180,000 ) $ 10,975,000 Mortgage-backed securities 23,284,000 568,000 (128,000 ) 23,724,000 State and political subdivisions 217,828,000 3,931,000 (1,103,000 ) 220,656,000 Corporate securities 4,300,000 — — 4,300,000 $ 256,567,000 $ 4,499,000 $ (1,411,000 ) $ 259,655,000 Restricted equity securities Federal Home Loan Bank Stock $ 9,321,000 $ — $ — $ 9,321,000 Federal Reserve Bank Stock 1,037,000 — — 1,037,000 $ 10,358,000 $ — $ — $ 10,358,000
Contractual Maturities of Investment Securities	The following table summarizes the contractual maturities of investment securities at December 31, 2018 : Securities available for sale Securities to be held to maturity Amortized Cost Fair Value (Estimated) Amortized Cost Fair Value (Estimated) Due in 1 year or less $ — $ — $ 1,432,000 $ 1,433,000 Due in 1 to 5 years 13,501,000 13,518,000 20,717,000 20,778,000 Due in 5 to 10 years 83,954,000 83,326,000 157,544,000 155,313,000 Due after 10 years 226,354,000 220,572,000 75,970,000 73,376,000 $ 323,809,000 $ 317,416,000 $ 255,663,000 $ 250,900,000 The following table summarizes the contractual maturities of investment securities at December 31, 2017 : Securities available for sale Securities to be held to maturity Amortized Cost Fair Value (Estimated) Amortized Cost Fair Value (Estimated) Due in 1 year or less $ 111,000 $ 112,000 $ 635,000 $ 637,000 Due in 1 to 5 years 841,000 842,000 18,059,000 18,164,000 Due in 5 to 10 years 29,003,000 29,177,000 37,182,000 37,719,000 Due after 10 years 270,594,000 266,627,000 200,691,000 203,135,000 Equity securities 323,000 441,000 — — $ 300,872,000 $ 297,199,000 $ 256,567,000 $ 259,655,000
Schedule of Securities Gains and Losses	The following table shows securities gains and losses for 2018 , 2017 and 2016 : 2018 2017 2016 Proceeds from sales of securities $ 459,000 $ 15,587,000 $ 10,309,000 Gross realized gains 137,000 471,000 673,000 Gross realized losses — — — Net gain $ 137,000 $ 471,000 $ 673,000 Related income taxes $ 29,000 $ 165,000 $ 236,000
Schedule of Temporary Impairment Losses	Information regarding securities temporarily impaired as of December 31, 2018 is summarized below: Less than 12 months 12 months or more Total Fair Unrealized Fair Unrealized Fair Unrealized As of December 31, 2018 Value Losses Value Losses Value Losses U.S. Government-sponsored agencies $ — $ — $ 10,683,000 $ (472,000 ) $ 10,683,000 $ (472,000 ) Mortgage-backed securities 76,050,000 (1,061,000 ) 185,136,000 (5,926,000 ) 261,186,000 (6,987,000 ) State and political subdivisions 76,809,000 (1,784,000 ) 45,052,000 (3,873,000 ) 121,861,000 (5,657,000 ) $ 152,859,000 $ (2,845,000 ) $ 240,871,000 $ (10,271,000 ) $ 393,730,000 $ (13,116,000 ) As of December 31, 2017 , there were 241 securities with unrealized losses held in the Company's portfolio. These securities were temporarily impaired as a result of changes in interest rates reducing their fair value, of which 157 had been temporarily impaired for 12 months or more. Information regarding securities temporarily impaired as of December 31, 2017 is summarized below: Less than 12 months 12 months or more Total Fair Unrealized Fair Unrealized Fair Unrealized As of December 31, 2017 Value Losses Value Losses Value Losses U.S. Government-sponsored agencies $ 7,161,000 $ (94,000 ) $ 3,814,000 $ (86,000 ) $ 10,975,000 $ (180,000 ) Mortgage-backed securities 132,025,000 (1,857,000 ) 101,707,000 (2,693,000 ) 233,732,000 (4,550,000 ) State and political subdivisions 9,425,000 (149,000 ) 38,864,000 (1,061,000 ) 48,289,000 (1,210,000 ) Other equity securities — — 9,000 (3,000 ) 9,000 (3,000 ) $ 148,611,000 $ (2,100,000 ) $ 144,394,000 $ (3,843,000 ) $ 293,005,000 $ (5,943,000 )

Mortgage Servicing Rights (Tabl

Mortgage Servicing Rights (Tables)	12 Months Ended
	Dec. 31, 2018
Transfers and Servicing [Abstract]
Reconciliation of Mortgage Servicing Assets	Mortgage servicing rights are included in other assets and detailed in the following table: As of December 31, 2018 2017 Mortgage servicing rights $ 5,718,000 $ 5,428,000 Accumulated amortization (4,364,000 ) (4,160,000 ) $ 1,354,000 $ 1,268,000

Loans (Tables)

Loans (Tables)	12 Months Ended
	Dec. 31, 2018
Loans and Leases Receivable Disclosure [Abstract]
Composition of Loan Portfolio	The following table shows the composition of the Company's loan portfolio as of December 31, 2018 and 2017 : December 31, 2018 December 31, 2017 Commercial Real estate $ 353,243,000 28.5 % $ 323,809,000 27.8 % Construction 27,304,000 2.2 % 38,056,000 3.3 % Other 196,391,000 15.9 % 181,528,000 15.6 % Municipal 51,128,000 4.1 % 33,391,000 2.9 % Residential Term 469,145,000 37.9 % 432,661,000 37.1 % Construction 17,743,000 1.4 % 17,868,000 1.5 % Home equity line of credit 98,469,000 8.0 % 111,302,000 9.6 % Consumer 24,860,000 2.0 % 25,524,000 2.2 % Total loans $ 1,238,283,000 100.0 % $ 1,164,139,000 100.0 %
Loans to Directors, Officers and Employees which exceed $60,000	A summary of loans to directors and executive officers is as follows: For the years ended December 31, 2018 2017 Balance at beginning of year $ 22,354,000 $ 23,293,000 New loans 1,341,000 867,000 Repayments (1,192,000 ) (1,806,000 ) Retired director (354,000 ) — Balance at end of year $ 22,149,000 $ 22,354,000
Past Due Loans Aging	Information on the past-due status of loans as of December 31, 2018 , is presented in the following table: 30-59 Days Past Due 60-89 Days Past Due 90+ Days Past Due All Past Due Current Total 90+ Days & Accruing Commercial Real estate $ 1,274,000 $ — $ 777,000 $ 2,051,000 $ 351,192,000 $ 353,243,000 $ — Construction — 10,000 — 10,000 27,294,000 27,304,000 — Other 455,000 5,000 120,000 580,000 195,811,000 196,391,000 — Municipal — — — — 51,128,000 51,128,000 — Residential Term 1,097,000 3,518,000 2,023,000 6,638,000 462,507,000 469,145,000 339,000 Construction 76,000 — — 76,000 17,667,000 17,743,000 — Home equity line of credit 2,819,000 419,000 493,000 3,731,000 94,738,000 98,469,000 — Consumer 237,000 25,000 27,000 289,000 24,571,000 24,860,000 12,000 Total $ 5,958,000 $ 3,977,000 $ 3,440,000 $ 13,375,000 $ 1,224,908,000 $ 1,238,283,000 $ 351,000 Information on the past-due status of loans as of December 31, 2017 , is presented in the following table: 30-59 Days Past Due 60-89 Days Past Due 90+ Days Past Due All Past Due Current Total 90+ Days & Accruing Commercial Real estate $ 574,000 $ 80,000 $ 220,000 $ 874,000 $ 322,935,000 $ 323,809,000 $ — Construction — — — — 38,056,000 38,056,000 — Other 542,000 6,663,000 574,000 7,779,000 173,749,000 181,528,000 — Municipal — — — — 33,391,000 33,391,000 — Residential Term 1,031,000 4,372,000 2,256,000 7,659,000 425,002,000 432,661,000 436,000 Construction 101,000 370,000 — 471,000 17,397,000 17,868,000 — Home equity line of credit 537,000 445,000 725,000 1,707,000 109,595,000 111,302,000 — Consumer 159,000 18,000 9,000 186,000 25,338,000 25,524,000 9,000 Total $ 2,944,000 $ 11,948,000 $ 3,784,000 $ 18,676,000 $ 1,145,463,000 $ 1,164,139,000 $ 445,000
Nonaccrual Loans	Information on nonaccrual loans as of December 31, 2018 and 2017 is presented in the following table: As of December 31, 2018 2017 Commercial Real estate $ 1,226,000 $ 752,000 Construction — — Other 8,664,000 9,357,000 Municipal — — Residential Term 4,062,000 3,778,000 Construction — — Home equity line of credit 760,000 833,000 Consumer 15,000 16,000 Total $ 14,727,000 $ 14,736,000
Impaired Loans	Information regarding impaired loans is as follows: For the years ended December 31, 2018 2017 2016 Average investment in impaired loans $ 31,805,000 $ 29,108,000 $ 28,217,000 Interest income recognized on impaired loans, all on cash basis 864,000 784,000 1,104,000 As of December 31, 2018 2017 Balance of impaired loans $ 31,751,000 $ 31,392,000 Less portion for which no allowance for loan losses is allocated (21,030,000 ) (18,023,000 ) Portion of impaired loan balance for which an allowance for loan losses is allocated $ 10,721,000 $ 13,369,000 Portion of allowance for loan losses allocated to the impaired loan balance $ 2,308,000 $ 1,812,000
Impaired Loans by class of financing receivable	A breakdown of impaired loans by category as of December 31, 2018 , is presented in the following table: Recorded Investment Unpaid Principal Balance Related Allowance Average Recorded Investment Recognized Interest Income With No Related Allowance Commercial Real estate $ 8,718,000 $ 9,161,000 $ — $ 5,536,000 $ 380,000 Construction 721,000 721,000 — 762,000 43,000 Other 1,468,000 1,555,000 — 2,037,000 32,000 Municipal — — — — — Residential Term 9,136,000 10,317,000 — 9,427,000 289,000 Construction — — — — — Home equity line of credit 972,000 1,035,000 — 1,001,000 20,000 Consumer 15,000 42,000 — 13,000 — $ 21,030,000 $ 22,831,000 $ — $ 18,776,000 $ 764,000 With an Allowance Recorded Commercial Real estate $ 1,042,000 $ 1,059,000 $ 260,000 $ 3,477,000 $ 42,000 Construction — — — — — Other 7,791,000 8,216,000 1,696,000 7,471,000 5,000 Municipal — — — — — Residential Term 1,768,000 1,998,000 335,000 1,982,000 53,000 Construction — — — — — Home equity line of credit 120,000 124,000 17,000 99,000 — Consumer — — — — — $ 10,721,000 $ 11,397,000 $ 2,308,000 $ 13,029,000 $ 100,000 Total Commercial Real estate $ 9,760,000 $ 10,220,000 $ 260,000 $ 9,013,000 $ 422,000 Construction 721,000 721,000 — 762,000 43,000 Other 9,259,000 9,771,000 1,696,000 9,508,000 37,000 Municipal — — — — — Residential Term 10,904,000 12,315,000 335,000 11,409,000 342,000 Construction — — — — — Home equity line of credit 1,092,000 1,159,000 17,000 1,100,000 20,000 Consumer 15,000 42,000 — 13,000 — $ 31,751,000 $ 34,228,000 $ 2,308,000 $ 31,805,000 $ 864,000 Substantially all interest income recognized on impaired loans for all classes of financing receivables was recognized on a cash basis as received. A breakdown of impaired loans by category as of December 31, 2017 , is presented in the following table: Recorded Investment Unpaid Principal Balance Related Allowance Average Recorded Investment Recognized Interest Income With No Related Allowance Commercial Real estate $ 3,791,000 $ 3,996,000 $ — $ 5,124,000 $ 164,000 Construction 741,000 741,000 — 62,000 38,000 Other 2,591,000 2,671,000 — 1,908,000 36,000 Municipal — — — — — Residential Term 9,769,000 10,909,000 — 10,770,000 297,000 Construction — — — — — Home equity line of credit 1,115,000 1,429,000 — 1,351,000 18,000 Consumer 16,000 29,000 — 12,000 — $ 18,023,000 $ 19,775,000 $ — $ 19,227,000 $ 553,000 With an Allowance Recorded Commercial Real estate $ 3,999,000 $ 4,116,000 $ 224,000 $ 4,460,000 $ 152,000 Construction — — — 699,000 — Other 7,327,000 7,371,000 1,309,000 2,584,000 — Municipal — — — — — Residential Term 1,979,000 2,144,000 255,000 2,106,000 79,000 Construction — — — — — Home equity line of credit 64,000 67,000 24,000 32,000 — Consumer — — — — — $ 13,369,000 $ 13,698,000 $ 1,812,000 $ 9,881,000 $ 231,000 Total Commercial Real estate $ 7,790,000 $ 8,112,000 $ 224,000 $ 9,584,000 $ 316,000 Construction 741,000 741,000 — 761,000 38,000 Other 9,918,000 10,042,000 1,309,000 4,492,000 36,000 Municipal — — — — — Residential Term 11,748,000 13,053,000 255,000 12,876,000 376,000 Construction — — — — — Home equity line of credit 1,179,000 1,496,000 24,000 1,383,000 18,000 Consumer 16,000 29,000 — 12,000 — $ 31,392,000 $ 33,473,000 $ 1,812,000 $ 29,108,000 $ 784,000 A breakdown of impaired loans by category as of December 31, 2016 , is presented in the following table: Recorded Investment Unpaid Principal Balance Related Allowance Average Recorded Investment Recognized Interest Income With No Related Allowance Commercial Real estate $ 5,201,000 $ 5,614,000 $ — $ 6,252,000 $ 220,000 Construction — — — 32,000 — Other 1,671,000 1,852,000 — 1,074,000 86,000 Municipal — — — — — Residential Term 11,483,000 12,654,000 — 11,025,000 442,000 Construction — — — — — Home equity line of credit 1,361,000 1,733,000 — 1,213,000 33,000 Consumer — — — 9,000 — $ 19,716,000 $ 21,853,000 $ — $ 19,605,000 $ 781,000 With an Allowance Recorded Commercial Real estate $ 4,820,000 $ 4,925,000 $ 505,000 $ 4,153,000 $ 186,000 Construction 763,000 763,000 100,000 816,000 36,000 Other 72,000 72,000 39,000 317,000 — Municipal — — — — — Residential Term 2,186,000 2,328,000 304,000 3,209,000 101,000 Construction — — — — — Home equity line of credit 26,000 28,000 26,000 69,000 — Consumer — — — 48,000 — $ 7,867,000 $ 8,116,000 $ 974,000 $ 8,612,000 $ 323,000 Total Commercial Real estate $ 10,021,000 $ 10,539,000 $ 505,000 $ 10,405,000 $ 406,000 Construction 763,000 763,000 100,000 848,000 36,000 Other 1,743,000 1,924,000 39,000 1,391,000 86,000 Municipal — — — — — Residential Term 13,669,000 14,982,000 304,000 14,234,000 543,000 Construction — — — — — Home equity line of credit 1,387,000 1,761,000 26,000 1,282,000 33,000 Consumer — — — 57,000 — $ 27,583,000 $ 29,969,000 $ 974,000 $ 28,217,000 $ 1,104,000
Troubled Debt Restructurings on Financing Receivables	The following table shows TDRs by class and the specific reserve as of December 31, 2018 : Number of Loans Balance Specific Reserves Commercial Real estate 17 $ 8,631,000 $ 132,000 Construction 1 721,000 — Other 10 7,298,000 1,276,000 Municipal — — — Residential Term 45 8,074,000 160,000 Construction — — — Home equity line of credit 3 498,000 — Consumer — — — 76 $ 25,222,000 $ 1,568,000 The following table shows TDRs by class and the specific reserve as of December 31, 2017 : Number of Loans Balance Specific Reserves Commercial Real estate 8 $ 7,038,000 $ 90,000 Construction 1 741,000 — Other 4 561,000 — Municipal — — — Residential Term 46 8,948,000 233,000 Construction — — — Home equity line of credit 3 513,000 — Consumer — — — 62 $ 17,801,000 $ 323,000 As of December 31, 2018 , nine of the loans classified as TDRs with a total balance of $1,013,000 were more than 30 days past due. None of these loans had been placed on TDR status in the previous 12 months. The following table shows past-due TDRs by class and the associated specific reserves included in the allowance for loan losses as of December 31, 2018 : Number of Loans Balance Specific Reserves Commercial Real estate — $ — $ — Construction — — — Other — — — Municipal — — — Residential Term 8 846,000 26,000 Construction — — — Home equity line of credit 1 167,000 — Consumer — — — 9 $ 1,013,000 $ 26,000 As of December 31, 2017 , 12 of the loans classified as TDRs with a total balance of $1,407,000 were more than 30 days past due. None of these loans had been placed on TDR status in the previous 12 months. The following table shows past-due TDRs by class and the associated specific reserves included in the allowance for loan losses as of December 31, 2017 : Number of Loans Balance Specific Reserves Commercial Real estate — $ — $ — Construction — — — Other — — — Municipal — — — Residential Term 11 1,240,000 44,000 Construction — — — Home equity line of credit 1 167,000 — Consumer — — — 12 $ 1,407,000 $ 44,000 For the year ended December 31, 2018 , 18 loans were place on TDR status. The following table shows these TDRs by class and the associated specific reserves included in the allowance for loan losses as of December 31, 2018: Number of Loans Pre-Modification Outstanding Recorded Investment Post-Modification Outstanding Recorded Investment Specific Reserves Commercial Real estate 9 $ 1,729,000 $ 1,727,000 42,000 Construction — — — — Other 6 7,116,000 6,798,000 1,276,000 Municipal — — — — Residential Term 3 520,000 507,000 26,000 Construction — — — — Home equity line of credit — — — — Consumer — — — — 18 $ 9,365,000 $ 9,032,000 1,344,000

Allowance for Loan Losses (Tabl

Allowance for Loan Losses (Tables)	12 Months Ended
	Dec. 31, 2018
Receivables [Abstract]
Allowance for loan losses by class of financing receivable and allowance	The following table summarizes the composition of the allowance for loan losses, by class of financing receivable and allowance, as of December 31, 2018 and 2017 : As of December 31, 2018 2017 Allowance for Loans Evaluated Individually for Impairment Commercial Real estate $ 260,000 $ 224,000 Construction — — Other 1,696,000 1,309,000 Municipal — — Residential Term 335,000 255,000 Construction — — Home equity line of credit 17,000 24,000 Consumer — — Total $ 2,308,000 $ 1,812,000 Allowance for Loans Evaluated Collectively for Impairment Commercial Real estate $ 3,307,000 $ 3,648,000 Construction 255,000 434,000 Other 1,845,000 2,049,000 Municipal 24,000 20,000 Residential Term 900,000 875,000 Construction 34,000 36,000 Home equity line of credit 713,000 668,000 Consumer 630,000 545,000 Unallocated 1,216,000 642,000 Total $ 8,924,000 $ 8,917,000 Total Allowance for Loan Losses Commercial Real estate $ 3,567,000 $ 3,872,000 Construction 255,000 434,000 Other 3,541,000 3,358,000 Municipal 24,000 20,000 Residential Term 1,235,000 1,130,000 Construction 34,000 36,000 Home equity line of credit 730,000 692,000 Consumer 630,000 545,000 Unallocated 1,216,000 642,000 Total $ 11,232,000 $ 10,729,000
Loan losses by loan segment and allowance element	A breakdown of the allowance for loan losses as of December 31, 2018 and 2017 , by class of financing receivable and allowance element, is presented in the following tables: As of December 31, 2018 Specific Reserves on Loans Evaluated Individually for Impairment General Reserves on Loans Based on Historical Loss Experience Reserves for Qualitative Factors Unallocated Reserves Total Reserves Commercial Real estate $ 260,000 $ 742,000 $ 2,565,000 $ — $ 3,567,000 Construction — 57,000 198,000 — 255,000 Other 1,696,000 414,000 1,431,000 — 3,541,000 Municipal — — 24,000 — 24,000 Residential Term 335,000 326,000 574,000 — 1,235,000 Construction — 12,000 22,000 — 34,000 Home equity line of credit 17,000 263,000 450,000 — 730,000 Consumer — 271,000 359,000 — 630,000 Unallocated — — — 1,216,000 1,216,000 $ 2,308,000 $ 2,085,000 $ 5,623,000 $ 1,216,000 $ 11,232,000 As of December 31, 2017 Specific Reserves on Loans Evaluated Individually for Impairment General Reserves on Loans Based on Historical Loss Experience Reserves for Qualitative Factors Unallocated Reserves Total Reserves Commercial Real estate $ 224,000 $ 1,285,000 $ 2,363,000 $ — $ 3,872,000 Construction — 153,000 281,000 — 434,000 Other 1,309,000 723,000 1,326,000 — 3,358,000 Municipal — — 20,000 — 20,000 Residential Term 255,000 311,000 564,000 — 1,130,000 Construction — 13,000 23,000 — 36,000 Home equity line of credit 24,000 297,000 371,000 — 692,000 Consumer — 251,000 294,000 — 545,000 Unallocated — — — 642,000 642,000 $ 1,812,000 $ 3,033,000 $ 5,242,000 $ 642,000 $ 10,729,000
Summary of risk ratings for loans	The following table summarizes the risk ratings for the Company's commercial construction, commercial real estate, commercial other and municipal loans as of December 31, 2018 : Commercial Real Estate Commercial Construction Commercial Other Municipal Loans All Risk- Rated Loans 1 Strong $ — $ — $ 3,444,000 $ — $ 3,444,000 2 Above average 10,484,000 37,000 4,564,000 48,800,000 63,885,000 3 Satisfactory 80,266,000 2,231,000 46,090,000 518,000 129,105,000 4 Average 172,597,000 18,780,000 82,081,000 1,810,000 275,268,000 5 Watch 66,325,000 5,970,000 45,546,000 — 117,841,000 6 OAEM 6,890,000 — 1,805,000 — 8,695,000 7 Substandard 16,558,000 286,000 12,861,000 — 29,705,000 8 Doubtful 123,000 — — — 123,000 Total $ 353,243,000 $ 27,304,000 $ 196,391,000 $ 51,128,000 $ 628,066,000 The following table summarizes the risk ratings for the Company's commercial construction, commercial real estate, commercial other and municipal loans as of December 31, 2017 : Commercial Real Estate Commercial Construction Commercial Other Municipal Loans All Risk- Rated Loans 1 Strong $ — $ — $ 1,586,000 $ — $ 1,586,000 2 Above average 12,534,000 40,000 5,776,000 32,673,000 51,023,000 3 Satisfactory 73,899,000 2,856,000 38,151,000 718,000 115,624,000 4 Average 173,956,000 22,446,000 84,360,000 — 280,762,000 5 Watch 41,652,000 12,714,000 33,934,000 — 88,300,000 6 OAEM 3,442,000 — 2,765,000 — 6,207,000 7 Substandard 18,203,000 — 14,956,000 — 33,159,000 8 Doubtful 123,000 — — — 123,000 Total $ 323,809,000 $ 38,056,000 $ 181,528,000 $ 33,391,000 $ 576,784,000
Allowance for loan losses transactions	The following tables present allowance for loan losses activity by class, allowance for loan loss balances by class and related loan balances by class for the years ended December 31, 2018 , 2017 and 2016 : For the year ended December 31, 2018 Commercial Residential Home Equity Line of Credit Real Estate Construction Other Municipal Term Construction Consumer Unallocated Total Allowance for loan losses: Beginning balance $ 3,872,000 $ 434,000 $ 3,358,000 $ 20,000 $ 1,130,000 $ 36,000 $ 692,000 $ 545,000 $ 642,000 $ 10,729,000 Chargeoffs 168,000 — 423,000 — 213,000 — 121,000 348,000 — 1,273,000 Recoveries 52,000 — 40,000 — 64,000 — 24,000 96,000 — 276,000 Provision (credit) (189,000 ) (179,000 ) 566,000 4,000 254,000 (2,000 ) 135,000 337,000 574,000 1,500,000 Ending balance $ 3,567,000 $ 255,000 $ 3,541,000 $ 24,000 $ 1,235,000 $ 34,000 $ 730,000 $ 630,000 $ 1,216,000 $ 11,232,000 Ending balance specifically evaluated for impairment $ 260,000 $ — $ 1,696,000 $ — $ 335,000 $ — $ 17,000 $ — $ — $ 2,308,000 Ending balance collectively evaluated for impairment $ 3,307,000 $ 255,000 $ 1,845,000 $ 24,000 $ 900,000 $ 34,000 $ 713,000 $ 630,000 $ 1,216,000 $ 8,924,000 Related loan balances: Ending balance $ 353,243,000 $ 27,304,000 $ 196,391,000 $ 51,128,000 $ 469,145,000 $ 17,743,000 $ 98,469,000 $ 24,860,000 $ — $ 1,238,283,000 Ending balance specifically evaluated for impairment $ 9,760,000 $ 721,000 $ 9,259,000 $ — $ 10,904,000 $ — $ 1,092,000 $ 15,000 $ — $ 31,751,000 Ending balance collectively evaluated for impairment $ 343,483,000 $ 26,583,000 $ 187,132,000 $ 51,128,000 $ 458,241,000 $ 17,743,000 $ 97,377,000 $ 24,845,000 $ — $ 1,206,532,000 For the year ended December 31, 2017 Commercial Residential Home Equity Line of Credit Real Estate Construction Other Municipal Term Construction Consumer Unallocated Total Allowance for loan losses: Beginning balance $ 3,988,000 $ 396,000 $ 1,780,000 $ 18,000 $ 1,288,000 $ 44,000 $ 807,000 $ 559,000 $ 1,258,000 $ 10,138,000 Chargeoffs 587,000 — 212,000 — 456,000 — 28,000 335,000 — 1,618,000 Recoveries — — 49,000 — 40,000 — 11,000 109,000 — 209,000 Provision (credit) 471,000 38,000 1,741,000 2,000 258,000 (8,000 ) (98,000 ) 212,000 (616,000 ) 2,000,000 Ending balance $ 3,872,000 $ 434,000 $ 3,358,000 $ 20,000 $ 1,130,000 $ 36,000 $ 692,000 $ 545,000 $ 642,000 $ 10,729,000 Ending balance specifically evaluated for impairment $ 224,000 $ — $ 1,309,000 $ — $ 255,000 $ — $ 24,000 $ — $ — $ 1,812,000 Ending balance collectively evaluated for impairment $ 3,648,000 $ 434,000 $ 2,049,000 $ 20,000 $ 875,000 $ 36,000 $ 668,000 $ 545,000 $ 642,000 $ 8,917,000 Related loan balances: Ending balance $ 323,809,000 $ 38,056,000 $ 181,528,000 $ 33,391,000 $ 432,661,000 $ 17,868,000 $ 111,302,000 $ 25,524,000 $ — $ 1,164,139,000 Ending balance specifically evaluated for impairment $ 7,790,000 $ 741,000 $ 9,918,000 $ — $ 11,748,000 $ — $ 1,179,000 $ 16,000 $ — $ 31,392,000 Ending balance collectively evaluated for impairment $ 316,019,000 $ 37,315,000 $ 171,610,000 $ 33,391,000 $ 420,913,000 $ 17,868,000 $ 110,123,000 $ 25,508,000 $ — $ 1,132,747,000 For the year ended December 31, 2016 Commercial Residential Home Equity Line of Credit Real Estate Construction Other Municipal Term Construction Consumer Unallocated Total Allowance for loan losses: Beginning balance $ 3,120,000 $ 580,000 $ 1,452,000 $ 17,000 $ 1,391,000 $ 24,000 $ 893,000 $ 566,000 $ 1,873,000 $ 9,916,000 Chargeoffs 294,000 75,000 376,000 — 379,000 — 147,000 450,000 — 1,721,000 Recoveries — 8,000 129,000 — 93,000 — 5,000 108,000 — 343,000 Provision (credit) 1,162,000 (117,000 ) 575,000 1,000 183,000 20,000 56,000 335,000 (615,000 ) 1,600,000 Ending balance $ 3,988,000 $ 396,000 $ 1,780,000 $ 18,000 $ 1,288,000 $ 44,000 $ 807,000 $ 559,000 $ 1,258,000 $ 10,138,000 Ending balance specifically evaluated for impairment $ 505,000 $ 100,000 $ 39,000 $ — $ 304,000 $ — $ 26,000 $ — $ — $ 974,000 Ending balance collectively evaluated for impairment $ 3,483,000 $ 296,000 $ 1,741,000 $ 18,000 $ 984,000 $ 44,000 $ 781,000 $ 559,000 $ 1,258,000 $ 9,164,000 Related loan balances: Ending balance $ 302,506,000 $ 25,406,000 $ 150,769,000 $ 27,056,000 $ 411,469,000 $ 18,303,000 $ 110,907,000 $ 25,110,000 $ — $ 1,071,526,000 Ending balance specifically evaluated for impairment $ 10,021,000 $ 763,000 $ 1,743,000 $ — $ 13,669,000 $ — $ 1,387,000 $ — $ — $ 27,583,000 Ending balance collectively evaluated for impairment $ 292,485,000 $ 24,643,000 $ 149,026,000 $ 27,056,000 $ 397,800,000 $ 18,303,000 $ 109,520,000 $ 25,110,000 $ — $ 1,043,943,000

Premises and Equipment (Tables)

Premises and Equipment (Tables)	12 Months Ended
	Dec. 31, 2018
Property, Plant and Equipment [Abstract]
Premises and Equipment	Premises and equipment are carried at cost and consist of the following: As of December 31, 2018 2017 Land $ 4,852,000 $ 4,639,000 Land improvements 1,105,000 1,052,000 Buildings 22,301,000 22,254,000 Equipment 12,461,000 13,147,000 40,719,000 41,092,000 Less accumulated depreciation 18,663,000 18,590,000 $ 22,056,000 $ 22,502,000
Schedule of Anticipated Rental Revenue	Future minimum receipts under lease agreements at December 31, 2018 for each of the next five years and in the aggregate are: 2019 $141,000 2020 101,000 2021 97,000 2022 94,000 2023 9,000 Thereafter — $442,000

Other Real Estate Owned (Tables

Other Real Estate Owned (Tables)	12 Months Ended
	Dec. 31, 2018
Real Estate Owned, Disclosure of Detailed Components [Abstract]
Other Real Estate Owned	The following summarizes other real estate owned: As of December 31, 2018 2017 Real estate acquired in settlement of loans $ 584,000 $ 1,012,000
Change in Allowance for Losses from Other Real Estate Owned	Changes in the allowance for losses from other real estate owned were as follows: For the years ended December 31, 2018 2017 2016 Balance at beginning of year $ 53,000 $ 205,000 $ 162,000 Losses charged to allowance (53,000 ) (169,000 ) (89,000 ) Provision charged to operating expenses — 17,000 132,000 Balance at end of year $ — $ 53,000 $ 205,000

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Current and Deferred Components of Income Tax Expense	The current and deferred components of income tax expense (benefit) were as follows: For the years ended December 31, 2018 2017 2016 Federal income tax Current $ 4,407,000 $ 4,184,000 $ 6,276,000 Deferred (492,000 ) 2,083,000 (139,000 ) 3,915,000 6,267,000 6,137,000 State franchise tax 391,000 345,000 317,000 $ 4,306,000 $ 6,612,000 $ 6,454,000
Actual Tax Expense from Expected Tax Expense	The actual tax expense differs from the expected tax expense (computed by applying the applicable U.S. Federal corporate income tax rate to income before income taxes) as follows: For the years ended December 31, 2018 2017 2016 Expected tax expense $ 5,847,000 $ 9,170,000 $ 8,562,000 Non-taxable income (1,699,000 ) (2,625,000 ) (2,176,000 ) State franchise tax, net of federal tax benefit 309,000 224,000 206,000 Equity compensation (55,000 ) (83,000 ) — Tax credits, net of amortization (85,000 ) (88,000 ) (105,000 ) Change in federal tax rate — 134,000 — Other (11,000 ) (120,000 ) (33,000 ) $ 4,306,000 $ 6,612,000 $ 6,454,000
Components of Deferred Tax Assets and Liabilities	Items that give rise to the deferred income tax assets and liabilities and the tax effect of each at December 31, 2018 and 2017 are as follows: 2018 2017 Allowance for loan losses $ 2,359,000 $ 2,253,000 OREO — 11,000 Accrued pension and post-retirement 955,000 1,036,000 Unrealized loss on securities transferred from available for sale to held to maturity 52,000 46,000 Unrealized loss on securities available for sale 1,343,000 772,000 Restricted stock grants 170,000 173,000 Core deposit intangible 18,000 15,000 Investment in flow through entities 31,000 22,000 Other assets 24,000 28,000 Total deferred tax asset 4,952,000 4,356,000 Net deferred loan costs (1,504,000 ) (1,313,000 ) Depreciation (1,300,000 ) (1,306,000 ) Goodwill (80,000 ) (39,000 ) Mortgage servicing rights (284,000 ) (266,000 ) Unrealized gain on derivative instruments (382,000 ) (410,000 ) Prepaid expense (159,000 ) (821,000 ) Total deferred tax liability (3,709,000 ) (4,155,000 ) Net deferred tax asset $ 1,243,000 $ 201,000

Certificates of Deposit (Tables

Certificates of Deposit (Tables)	12 Months Ended
	Dec. 31, 2018
Banking and Thrift [Abstract]
Certificates of deposit	The following table represents the breakdown of certificates of deposit at December 31, 2018 and 2017 : December 31, 2018 December 31, 2017 Certificates of deposit < $100,000 $ 372,464,000 $ 284,066,000 Certificates $100,000 to $250,000 162,185,000 232,759,000 Certificates $250,000 and over 56,760,000 42,176,000 $ 591,409,000 $ 559,001,000
Maturities of certificates of deposit	At December 31, 2018 , the scheduled maturities of certificates of deposit are as follows: Year of Maturity Less than $100,000 $100,000 and Greater All Certificates of Deposit 2019 $ 303,468,000 $ 108,341,000 $ 411,809,000 2020 25,150,000 36,046,000 61,196,000 2021 20,073,000 24,534,000 44,607,000 2022 10,752,000 16,831,000 27,583,000 2023 13,015,000 33,193,000 46,208,000 2024 and thereafter 6,000 — 6,000 $ 372,464,000 $ 218,945,000 $ 591,409,000

Borrowed Funds (Tables)

Borrowed Funds (Tables)	12 Months Ended
	Dec. 31, 2018
Borrowed Funds [Abstract]
Range of Interest Rates and Maturity Dates of Borrowed Funds	Borrowed funds at December 31, 2018 and 2017 have the following range of interest rates and maturity dates: As of December 31, 2018 Federal Home Loan Bank Advances 2019 2.25% - 2.58% $ 105,000,000 2020 1.60% - 1.97% 55,000,000 2021 1.55% 10,000,000 2024 and thereafter 0.00% 112,000 170,112,000 Repurchase agreements Municipal and commercial customers 0.15% - 2.00% 40,205,000 $ 210,317,000 As of December 31, 2017 Federal Home Loan Bank Advances 2018 1.59% - 3.25% $ 43,074,000 2020 1.60% - 1.97% 55,000,000 2021 1.55% 10,000,000 2023 and thereafter 0.00% - 0.99% 50,120,000 158,194,000 Repurchase agreements Municipal and commercial customers 0.15% - 2.48% 70,564,000 $ 228,758,000

Employee Benefit Plans (Tables)

Employee Benefit Plans (Tables)	12 Months Ended
	Dec. 31, 2018
Retirement Benefits, Description [Abstract]
Accumulated post-retirement benefit obligation and funded status	The following table sets forth the accumulated post-retirement benefit obligation and funded status: At December 31, 2018 2017 2016 Change in benefit obligations Benefit obligation at beginning of year: $ 1,874,000 $ 1,870,000 $ 1,967,000 Interest cost 77,000 77,000 81,000 Benefits paid (117,000 ) (113,000 ) (109,000 ) Actuarial (gain) loss (235,000 ) 40,000 (69,000 ) Benefit obligation at end of year: $ 1,599,000 $ 1,874,000 $ 1,870,000 Funded status Benefit obligation at end of year $ (1,599,000 ) $ (1,874,000 ) $ (1,870,000 ) Unamortized (gain) loss (47,000 ) 186,000 156,000 Accrued benefit cost $ (1,646,000 ) $ (1,688,000 ) $ (1,714,000 ) Weighted average discount rate as of December 31 4.25 % 4.25 % 4.25 %
Schedule of net benefit costs	The following table sets forth the net periodic benefit cost: For the years ended December 31, 2018 2017 2016 Components of net periodic benefit cost Interest cost $ 77,000 $ 77,000 $ 81,000 Amortization of loss — — 4,000 Other settlement (income) expense (3,000 ) 11,000 11,000 Net periodic benefit cost $ 74,000 $ 88,000 $ 96,000 Weighted average discount rate for net periodic cost 4.25 % 4.25 % 4.25 %
Schedule of net periodic benefit cost not yet recognized	In accordance with FASB ASC Topic 715, "Compensation – Retirement Benefits", amounts not yet reflected in net periodic benefit cost and included in accumulated other comprehensive income (loss) are as follows: At December 31, 2018 2017 Portion to Be Recognized in Income in 2019 Unamortized net actuarial gain (loss) $ 47,000 $ (186,000 ) $ (160,000 ) Deferred tax (expense) benefit at 21% in 2018 and 35% in 2017 (10,000 ) 65,000 34,000 Reclassification adjustment for effect of enacted tax law changes — (26,000 ) — Net unrecognized post-retirement benefits included in accumulated other comprehensive income (loss) $ 37,000 $ (147,000 ) $ (126,000 )

Other Comprehensive Income (L_2

Other Comprehensive Income (Loss) (Tables)	12 Months Ended
	Dec. 31, 2018
Equity [Abstract]
Schedule of Accumulated Other Comprehensive Income (Loss)	The following table summarizes activity in the unrealized gain or loss on available for sale securities included in other comprehensive income (loss) for the years ended December 31, 2018 , 2017 and 2016 . For the years ended December 31, 2018 2017 2016 Balance at beginning of year $ (2,901,000 ) $ (935,000 ) $ 1,123,000 Unrealized losses arising during the year (2,585,000 ) (1,763,000 ) (2,493,000 ) Reclassification of realized gains during the year (137,000 ) (471,000 ) (673,000 ) Related deferred taxes 572,000 782,000 1,108,000 Reclassification adjustment for effect of enacted tax law changes — (514,000 ) — Net change (2,150,000 ) (1,966,000 ) (2,058,000 ) Balance at end of year $ (5,051,000 ) $ (2,901,000 ) $ (935,000 ) The reclassification of realized gains is included in the net securities gains line of the consolidated statements of income and comprehensive income and the tax effect is included in the income tax expense line of the same statement. The following table summarizes activity in the unrealized loss on securities transferred from available for sale to held to maturity included in other comprehensive income (loss) for the years ended December 31, 2018 , 2017 , and 2016 . For the years ended December 31, 2018 2017 2016 Balance at beginning of year $ (174,000 ) $ (129,000 ) $ (112,000 ) Amortization of net unrealized losses (29,000 ) (22,000 ) (26,000 ) Related deferred taxes 6,000 8,000 9,000 Reclassification adjustment for effect of enacted tax law changes — (31,000 ) — Net change (23,000 ) (45,000 ) (17,000 ) Balance at end of year $ (197,000 ) $ (174,000 ) $ (129,000 ) The following table represents the effect of the Company's derivative financial instruments included in other comprehensive income (loss) for the years ended December 31, 2018 , 2017 , and 2016 . For the years ended December 31, 2018 2017 2016 Balance at beginning of year $ 1,544,000 $ 1,163,000 $ — Unrealized gains (losses) on cash flow hedging derivatives arising during the year (134,000 ) 165,000 1,790,000 Related deferred taxes 28,000 (58,000 ) (627,000 ) Reclassification adjustment for effect of enacted tax law changes — 274,000 — Net change (106,000 ) 381,000 1,163,000 Balance at end of year $ 1,438,000 $ 1,544,000 $ 1,163,000 The following table summarizes activity in the unrealized gain or loss on postretirement benefits included in other comprehensive income (loss) for the years ended December 31, 2018 , 2017 , and 2016 : For the years ended December 31, 2018 2017 2016 Unrecognized postretirement benefits at beginning of year $ (147,000 ) $ (102,000 ) $ (156,000 ) Change in unamortized net actuarial gain (loss) 233,000 (30,000 ) 84,000 Related deferred taxes (49,000 ) 11,000 (30,000 ) Reclassification adjustment for effect of enacted tax law changes — (26,000 ) $ — Net change 184,000 (45,000 ) $ 54,000 Unrecognized postretirement benefits at end of year $ 37,000 $ (147,000 ) $ (102,000 )

Financial Derivative Instrume_2

Financial Derivative Instruments (Tables)	12 Months Ended
	Dec. 31, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule of Derivative Instruments	The details of the interest rate swap agreements are as follows: As of December 31, 2018 2017 Notional Amount Effective Date Maturity Date Variable Index Received Fixed Rate Paid Fair Value (1) Fair Value (1) $ 30,000,000 June 28, 2016 June 28, 2021 1-Month USD LIBOR 0.94 % $ 1,110,000 $ 1,154,000 $ 20,000,000 June 27, 2016 June 27, 2021 1-Month USD LIBOR 0.89 % $ 763,000 801,000 $ 25,000,000 June 5, 2018 December 5, 2019 1-Month USD LIBOR 2.47 % $ 16,000 — $ 25,000,000 June 5, 2018 June 5, 2020 1-Month USD LIBOR 2.55 % $ (9,000 ) — $ 25,000,000 June 5, 2018 December 5, 2020 1-Month USD LIBOR 2.60 % $ (60,000 ) — $ 125,000,000 $ 1,820,000 $ 1,955,000 (1)

Stock Options and Stock-Based_2

Stock Options and Stock-Based Compensation (Tables)	12 Months Ended
	Dec. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Schedule of Nonvested Restricted Stock Units Activity	As of December 31, 2018 , 144,355 shares of restricted stock had been granted under the 2010 Plan, of which 67,689 shares remain restricted as of December 31, 2018 as detailed in the following table: Year Granted Vesting Term (In Years) Shares Remaining Term (In Years) 2014 5.0 10,422 0.1 2015 5.0 12,023 1.0 2016 5.0 15,015 2.0 2017 3.0 4,902 1.1 2017 5.0 9,972 3.0 2018 1.0 300 0.1 2018 2.0 932 1.0 2018 3.0 2,400 2.1 2018 4.0 2,068 3.0 2018 5.0 9,655 4.0 67,689 1.8

Earnings Per Share (Tables)

Earnings Per Share (Tables)	12 Months Ended
	Dec. 31, 2018
Earnings Per Share [Abstract]
Basic and diluted earnings per share (EPS)	The following table provides detail for basic earnings per share (EPS) and diluted (EPS) for the years ended December 31, 2018 , 2017 and 2016 : Income (Numerator) Shares (Denominator) Per-Share Amount For the year ended December 31, 2018 Net income as reported $ 23,536,000 Basic EPS: Income available to common shareholders 23,536,000 10,783,419 $ 2.18 Effect of dilutive securities: restricted stock 69,055 Diluted EPS: Income available to common shareholders plus assumed conversions $ 23,536,000 10,852,474 $ 2.17 For the year ended December 31, 2017 Net income as reported $ 19,588,000 Basic EPS: Income available to common shareholders 19,588,000 10,747,306 $ 1.82 Effect of dilutive securities: restricted stock 71,712 Diluted EPS: Income available to common shareholders plus assumed conversions $ 19,588,000 10,819,018 $ 1.81 For the year ended December 31, 2016 Net income as reported $ 18,009,000 Basic EPS: Income available to common shareholders 18,009,000 10,713,290 $ 1.68 Effect of dilutive securities: restricted stock and warrants 116,512 Diluted EPS: Income available to common shareholders plus assumed conversions $ 18,009,000 10,829,802 $ 1.66

Regulatory Capital Requiremen_2

Regulatory Capital Requirements (Tables)	12 Months Ended
	Dec. 31, 2018
Regulatory Capital Requirements [Abstract]
The actual and minimum capital amounts and ratios	The actual and minimum capital amounts and ratios for the Bank are presented in the following table: Actual For capital adequacy purposes To be well-capitalized under prompt corrective action provisions As of December 31, 2018 Tier 2 capital to $ 175,448,000 $ 92,892,000 $ 116,115,000 risk-weighted assets 15.11 % 8.00 % 10.00 % Tier 1 capital to $ 164,116,000 $ 69,669,000 $ 92,892,000 risk-weighted assets 14.13 % 6.00 % 8.00 % Common equity Tier 1 capital to $ 164,116,000 $ 52,252,000 $ 75,474,000 risk-weighted assets 14.13 % 4.50 % 6.50 % Tier 1 capital to $ 164,116,000 $ 77,269,000 $ 96,586,000 average assets 8.51 % 4.00 % 5.00 % As of December 31, 2017 Tier 2 capital to $ 162,355,000 $ 86,063,000 $ 107,579,000 risk-weighted assets 15.09 % 8.00 % 10.00 % Tier 1 capital to $ 151,526,000 $ 64,548,000 $ 86,063,000 risk-weighted assets 14.09 % 6.00 % 8.00 % Common equity Tier 1 capital to $ 151,526,000 $ 48,411,000 $ 69,926,000 risk-weighted assets 14.09 % 4.50 % 6.50 % Tier 1 capital to $ 151,526,000 $ 71,386,000 $ 89,233,000 average assets 8.49 % 4.00 % 5.00 % The actual and minimum capital amounts and ratios for the Company, on a consolidated basis, are presented in the following table: Actual For capital adequacy purposes To be well-capitalized under prompt corrective action provisions As of December 31, 2018 Tier 2 capital to $ 176,349,000 $ 92,892,000 n/a risk-weighted assets 15.19 % 8.00 % n/a Tier 1 capital to $ 165,117,000 $ 69,669,000 n/a risk-weighted assets 14.22 % 6.00 % n/a Common equity Tier 1 capital to $ 165,117,000 $ 52,252,000 n/a risk-weighted assets 14.22 % 4.50 % n/a Tier 1 capital to $ 165,117,000 $ 76,810,000 n/a average assets 8.60 % 4.00 % n/a As of December 31, 2017 Tier 2 capital to $ 163,943,000 $ 86,070,000 n/a risk-weighted assets 15.24 % 8.00 % n/a Tier 1 capital to $ 153,114,000 $ 64,553,000 n/a risk-weighted assets 14.23 % 6.00 % n/a Common equity Tier 1 capital to $ 153,114,000 $ 48,415,000 n/a risk-weighted assets 14.23 % 4.50 % n/a Tier 1 capital to $ 153,114,000 $ 71,435,000 n/a average assets 8.57 % 4.00 % n/a

Off-Balance-Sheet Financial I_2

Off-Balance-Sheet Financial Instruments and Concentrations of Credit Risk (Tables)	12 Months Ended
	Dec. 31, 2018
Commitments and Contingencies Disclosure [Abstract]
Off-Balance-Sheet Financial instruments	At December 31, 2018 and 2017 , the Bank had the following off-balance-sheet financial instruments, whose contract amounts represent credit risk: As of December 31, 2018 2017 Unused lines, collateralized by residential real estate $ 83,421,000 $ 76,887,000 Other unused commitments 60,033,000 62,771,000 Standby letters of credit 3,590,000 3,497,000 Commitments to extend credit 19,268,000 8,724,000 Total $ 166,312,000 $ 151,879,000

Fair Value Disclosures (Tables)

Fair Value Disclosures (Tables)	12 Months Ended
	Dec. 31, 2018
Fair Value Disclosures [Abstract]
Assets and liabilities measured on recurring basis measured at fair value	The following tables present the balances of assets and liabilities that were measured at fair value on a recurring basis as of December 31, 2018 and 2017 . At December 31, 2018 Level 1 Level 2 Level 3 Total Securities available for sale U.S. Government-sponsored agencies $ — $ 5,007,000 $ — $ 5,007,000 Mortgage-backed securities — 307,693,000 — 307,693,000 State and political subdivisions — 4,716,000 — 4,716,000 Total securities available for sale $ — $ 317,416,000 $ — $ 317,416,000 Interest rate swap agreements $ — $ 1,820,000 $ — $ 1,820,000 Total assets $ — $ 319,236,000 $ — $ 319,236,000 At December 31, 2017 Level 1 Level 2 Level 3 Total Securities available for sale Mortgage-backed securities $ — $ 289,989,000 $ — $ 289,989,000 State and political subdivisions — 6,769,000 — 6,769,000 Other equity securities — 441,000 — 441,000 Total securities available for sale $ — $ 297,199,000 $ — $ 297,199,000 Interest rate swap agreements $ — $ 1,955,000 $ — $ 1,955,000 Total assets $ — $ 299,154,000 $ — $ 299,154,000
Assets and liabilities measured on non-recurring basis measured at fair value	The following tables present assets measured at fair value on a nonrecurring basis that have had a fair value adjustment since their initial recognition. Other real estate owned is presented net of an allowance for losses of $0 and $53,000 at December 31, 2018 and 2017 , respectively. Only collateral-dependent impaired loans with a related specific allowance for loan losses or a partial charge off are included in impaired loans for purposes of fair value disclosures. Impaired loans below are presented net of specific allowances of $2,096,000 and $1,531,000 at December 31, 2018 and 2017 , respectively. At December 31, 2018 Level 1 Level 2 Level 3 Total Other real estate owned $ — $ 584,000 $ — $ 584,000 Impaired loans — 7,415,000 — 7,415,000 Total assets $ — $ 7,999,000 $ — $ 7,999,000 At December 31, 2017 Level 1 Level 2 Level 3 Total Other real estate owned $ — $ 1,012,000 $ — $ 1,012,000 Impaired loans — 6,521,000 — 6,521,000 Total assets $ — $ 7,533,000 $ — $ 7,533,000
Estimated fair value of financial instruments	The carrying amounts and estimated fair values for financial instruments as of December 31, 2018 were as follows: Carrying Estimated As of December 31, 2018 value fair value Level 1 Level 2 Level 3 Financial assets Securities to be held to maturity $255,663,000 $250,900,000 $ — $250,900,000 $ — Loans (net of allowance for loan losses) Commercial Real estate 349,243,000 340,526,000 — 423,000 340,103,000 Construction 27,018,000 26,344,000 — — 26,344,000 Other 192,420,000 189,842,000 — 6,096,000 183,746,000 Municipal 51,101,000 50,965,000 — — 50,965,000 Residential Term 467,760,000 451,323,000 — 793,000 450,530,000 Construction 17,705,000 17,083,000 — — 17,083,000 Home equity line of credit 97,650,000 95,175,000 — 103,000 95,072,000 Consumer 24,154,000 22,530,000 — — 22,530,000 Total loans 1,227,051,000 1,193,788,000 — 7,415,000 1,186,373,000 Mortgage servicing rights 1,354,000 2,586,000 — 2,586,000 — Financial liabilities Local certificates of deposit $284,482,000 $281,282,000 — $281,282,000 — National certificates of deposit 306,927,000 307,508,000 — 307,508,000 — Total certificates of deposit deposits 591,409,000 588,790,000 — 588,790,000 — Repurchase agreements 40,205,000 40,161,000 — 40,161,000 — Federal Home Loan Bank advances 170,112,000 169,240,000 — 169,240,000 — Total borrowed funds 210,317,000 209,401,000 — 209,401,000 — The carrying amounts and estimated fair values for financial instruments as of December 31, 2017 were as follows: Carrying Estimated As of December 31, 2017 value fair value Level 1 Level 2 Level 3 Financial assets Securities to be held to maturity $256,567,000 $259,655,000 $ — $259,655,000 $ — Loans (net of allowance for loan losses) Commercial Real estate 319,691,000 311,321,000 — 72,000 311,249,000 Construction 37,594,000 36,610,000 — — 36,610,000 Other 177,956,000 175,455,000 — 6,018,000 169,437,000 Municipal 33,370,000 33,280,000 — — 33,280,000 Residential Term 431,459,000 431,028,000 — 391,000 430,637,000 Construction 17,830,000 17,613,000 — — 17,613,000 Home equity line of credit 110,566,000 109,012,000 — 40,000 108,972,000 Consumer 24,944,000 24,408,000 — — 24,408,000 Total loans 1,153,410,000 1,138,727,000 — 6,521,000 1,132,206,000 Mortgage servicing rights 1,268,000 2,321,000 — 2,321,000 — Financial liabilities Local certificates of deposit $223,074,000 $220,734,000 $ — $220,734,000 $ — National certificates of deposit 335,927,000 335,775,000 — 335,775,000 — Total certificates of deposits 559,001,000 556,509,000 — 556,509,000 — Repurchase agreements 70,564,000 67,976,000 — 67,976,000 — Federal Home Loan Bank advances 158,194,000 156,396,000 — 156,396,000 — Total borrowed funds 228,758,000 224,372,000 — 224,372,000 —

Other Operating Income and Ex_2

Other Operating Income and Expense (Tables)	12 Months Ended
	Dec. 31, 2018
Other Income and Expenses [Abstract]
Other operating income and expense	Other operating income and other operating expense include the following items greater than 1% of revenues. For the years ended December 31, 2018 2017 2016 Other operating income ATM and debit card income $ 3,556,000 $ 3,378,000 $ 3,024,000 Other operating expense Advertising and marketing expense $ 1,165,000 $ 1,208,000 $ 1,099,000 Accounting and auditing expenses 837,000 818,000 690,000 ATM and interchange expense 995,000 886,000 853,000

Condensed Financial Informati_2

Condensed Financial Information of Parent (Tables)	12 Months Ended
	Dec. 31, 2018
Condensed Financial Information Disclosure [Abstract]
Condensed financial information for Parent	Condensed financial information for The First Bancorp, Inc. exclusive of its subsidiary is as follows: Balance Sheets As of December 31, 2018 2017 Assets Cash and cash equivalents $ 1,190,000 $ 958,000 Dividends receivable 2,950,000 2,500,000 Investments — 441,000 Investment in subsidiary 162,763,000 152,174,000 Premises and equipment 2,000 3,000 Goodwill 27,559,000 27,559,000 Other assets 232,000 312,000 Total assets $ 194,696,000 $ 183,947,000 Liabilities and shareholders' equity Dividends payable $ 3,150,000 $ 2,599,000 Other liabilities 4,000 27,000 Total liabilities 3,154,000 2,626,000 Shareholders' equity Common stock 109,000 108,000 Additional paid-in capital 62,746,000 61,747,000 Retained earnings 128,687,000 119,373,000 Accumulated other comprehensive income Net unrealized gain on available for sale securities, net of tax — 93,000 Total accumulated other comprehensive income — 93,000 Total shareholders' equity 191,542,000 181,321,000 Total liabilities and shareholders' equity $ 194,696,000 $ 183,947,000 Statements of Income For the years ended December 31, 2018 2017 2016 Interest and dividends on investments $ — $ 15,000 $ 22,000 Net securities gains (losses) 137,000 (3,000 ) (6,000 ) Total income 137,000 12,000 16,000 Occupancy expense 2,000 5,000 9,000 Other operating expense 652,000 588,000 528,000 Total expense 654,000 593,000 537,000 Loss before income taxes and Bank earnings (517,000 ) (581,000 ) (521,000 ) Applicable income taxes (164,000 ) (187,000 ) (186,000 ) Loss before Bank earnings (353,000 ) (394,000 ) (335,000 ) Equity in earnings of Bank Remitted 11,300,000 11,180,000 11,300,000 Unremitted 12,589,000 8,802,000 7,044,000 Net income $ 23,536,000 $ 19,588,000 $ 18,009,000 Statements of Cash Flows For the years ended December 31, 2018 2017 2016 Cash flows from operating activities: Net income $ 23,536,000 $ 19,588,000 $ 18,009,000 Adjustments to reconcile net income to net cash provided by operating activities: Depreciation — 5,000 8,000 Equity compensation expense 381,000 392,000 298,000 (Gain) loss on sale of investments (137,000 ) 3,000 6,000 Tax benefit from vesting of restricted stock — — 32,000 Decrease in other assets 81,000 27,000 136,000 (Increase) decrease in dividends receivable (450,000 ) 1,300,000 (1,300,000 ) Increase (decrease) in dividends payable 551,000 (1,179,000 ) 112,000 Increase (decrease) in other liabilities — (3,000 ) (4,000 ) Unremitted earnings of Bank (12,589,000 ) (8,802,000 ) (7,044,000 ) Net cash provided by operating activities 11,373,000 11,331,000 10,253,000 Cash flows from investing activities: Proceeds from sales/maturities of investments 459,000 — 87,000 Capital expenditures 1,000 (4,000 ) — Net cash provided by (used in) investing activities 460,000 (4,000 ) 87,000 Cash flows from financing activities: Purchase of common stock (168,000 ) (154,000 ) (129,000 ) Proceeds from sale of common stock 619,000 632,000 531,000 Repurchase of warrants — — (1,750,000 ) Dividends paid (12,052,000 ) (11,460,000 ) (9,810,000 ) Net cash used in financing activities (11,601,000 ) (10,982,000 ) (11,158,000 ) Net increase (decrease) in cash and cash equivalents 232,000 345,000 (818,000 ) Cash and cash equivalents at beginning of year 958,000 613,000 1,431,000 Cash and cash equivalents at end of year $ 1,190,000 $ 958,000 $ 613,000

Quarterly Information (Tables)

Quarterly Information (Tables)	12 Months Ended
	Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract]
Quarterly information	The following tables provide unaudited financial information by quarter for each of the past two years: Dollars in thousands except per share data 2017Q1 2017Q2 2017Q3 2017Q4 2018Q1 2018Q2 2018Q3 2018Q4 Balance Sheets Cash and cash equivalents $ 17,600 $ 23,718 $ 22,375 $ 19,207 $ 16,559 $ 21,056 $ 21,649 $ 19,134 Interest-bearing deposits in other banks 3,272 291 584 860 280 1,616 51,045 12,079 Investments 553,453 552,269 541,678 553,766 562,459 565,125 562,839 573,079 Restricted equity securities 13,363 12,311 10,798 10,358 11,947 12,363 11,586 11,586 Net loans and loans held for sale 1,080,347 1,110,919 1,110,508 1,153,796 1,177,329 1,213,449 1,233,010 1,227,051 Other assets 95,793 96,143 95,758 104,943 103,241 100,352 101,725 101,641 Total assets $ 1,763,828 $ 1,795,651 $ 1,781,701 $ 1,842,930 $ 1,871,815 $ 1,913,961 $ 1,981,854 $ 1,944,570 Deposits $ 1,346,483 $ 1,319,259 $ 1,350,049 $ 1,418,879 $ 1,428,192 $ 1,416,646 $ 1,514,911 $ 1,527,085 Borrowed funds 226,467 282,277 234,328 228,758 244,229 297,455 265,274 210,317 Other liabilities 15,968 16,578 17,442 13,972 18,022 16,556 17,008 15,626 Shareholders' equity 174,910 177,537 179,882 181,321 181,372 183,304 184,661 191,542 Total liabilities & equity $ 1,763,828 $ 1,795,651 $ 1,781,701 $ 1,842,930 $ 1,871,815 $ 1,913,961 $ 1,981,854 $ 1,944,570 Income and Comprehensive Income Statements Interest income $ 14,491 $ 15,002 $ 15,517 $ 15,822 $ 16,451 $ 17,205 $ 18,086 $ 18,801 Interest expense 3,015 3,337 3,563 3,614 4,042 4,936 5,550 5,806 Net interest income 11,476 11,665 11,954 12,208 12,409 12,269 12,536 12,995 Provision for loan losses 500 500 750 250 500 500 333 167 Net interest income after provision for loan losses 10,976 11,165 11,204 11,958 11,909 11,769 12,203 12,828 Non-interest income 2,843 3,002 3,493 3,210 3,132 3,181 3,034 3,253 Non-interest expense 7,698 7,640 8,013 8,300 8,579 8,176 8,216 8,496 Income before taxes 6,121 6,527 6,684 6,868 6,462 6,774 7,021 7,585 Income taxes 1,484 1,644 1,702 1,782 956 1,040 1,088 1,222 Net income $ 4,637 $ 4,883 $ 4,982 $ 5,086 $ 5,506 $ 5,734 $ 5,933 $ 6,363 Basic earnings per share $ 0.43 $ 0.45 $ 0.46 $ 0.48 $ 0.51 $ 0.53 $ 0.55 $ 0.59 Diluted earnings per share $ 0.43 $ 0.45 $ 0.46 $ 0.47 $ 0.51 $ 0.53 $ 0.55 $ 0.58 Other comprehensive income (loss), net of tax Net unrealized gain (loss) on securities available for sale $ 1 $ 349 $ (240 ) $ (1,562 ) $ (3,309 ) $ (1,035 ) $ (1,888 ) $ 4,082 Net unrealized loss on securities transfered from available for sale to held to maturity (4 ) (4 ) (3 ) (3 ) (8 ) (7 ) (5 ) (3 ) Net unrealized gain (loss) on cash flow hedging derivative instruments 63 (171 ) (20 ) 235 384 138 216 (844 ) Unrecognized gain (loss) on postretirement benefit costs — — — (19 ) — — — 184 Other comprehensive income (loss) $ 60 $ 174 $ (263 ) $ (1,349 ) $ (2,933 ) $ (904 ) $ (1,677 ) $ 3,419 Comprehensive income $ 4,697 $ 5,057 $ 4,719 $ 3,737 $ 2,573 $ 4,830 $ 4,256 $ 9,782

Summary of Significant Accoun_3

Summary of Significant Accounting Policies (Details) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2017USD ($)	Dec. 31, 2018USD ($)segment	Dec. 31, 2017USD ($)	Dec. 31, 2016USD ($)
Business Acquisition [Line Items]
Finite lived intangible asset, amortization (in years)		10 years
Amortization of identified intangibles		$ 43	$ 43	$ 43
Net tax deferred assets	$ 134
Number of reportable operating segments | segment		1
Bank Acquisitions From Camden National Bank | Core Deposits
Business Acquisition [Line Items]
Amortization of identified intangibles		$ 43	$ 43	$ 43
Yearly amortization expense until fully amortized		$ 43

Cash and Cash Equivalents (Deta

Cash and Cash Equivalents (Details) $ in Thousands	Dec. 31, 2018USD ($)
Cash and Cash Equivalents [Abstract]
Contractual clearing balance	$ 500
Cash held in Reserve at Federal Reserve Bank	$ 2,359

Investment Securities - Summary

Investment Securities - Summary of Amortized Cost and Estimated Fair Value (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 323,809
Unrealized Gains	578
Unrealized Losses	(6,971)
Fair Value (Estimated)	317,416
Securities available-for-sale, Amortized Cost		$ 300,872
Securities available-for-sale, Unrealized Gains		859
Securities available-for-sale, Unrealized Losses		(4,532)
Securities available-for-sale, Fair Value (Estimated)		297,199
Securities to be held to maturity, cost and FMV [Abstract]
Amortized Cost	255,663	256,567
Unrealized Gains	1,382	4,499
Unrealized Losses	(6,145)	(1,411)
Fair Value (Estimated)	250,900	259,655
Restricted equity securities
Federal Home Loan Bank Stock	10,549	9,321
Federal Reserve Bank Stock	1,037	1,037
Restricted equity securities	11,586	10,358
State and political subdivisions
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	4,955
Unrealized Gains	0
Unrealized Losses	(239)
Fair Value (Estimated)	4,716
Securities available-for-sale, Amortized Cost		6,860
Securities available-for-sale, Unrealized Gains		16
Securities available-for-sale, Unrealized Losses		(107)
Securities available-for-sale, Fair Value (Estimated)		6,769
Securities to be held to maturity, cost and FMV [Abstract]
Amortized Cost	221,958	217,828
Unrealized Gains	1,046	3,931
Unrealized Losses	(5,418)	(1,103)
Fair Value (Estimated)	217,586	220,656
Mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	313,854
Unrealized Gains	571
Unrealized Losses	(6,732)
Fair Value (Estimated)	307,693
Securities available-for-sale, Amortized Cost		293,689
Securities available-for-sale, Unrealized Gains		722
Securities available-for-sale, Unrealized Losses		(4,422)
Securities available-for-sale, Fair Value (Estimated)		289,989
Securities to be held to maturity, cost and FMV [Abstract]
Amortized Cost	18,250	23,284
Unrealized Gains	336	568
Unrealized Losses	(255)	(128)
Fair Value (Estimated)	18,331	23,724
U.S. Government-sponsored agencies
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	5,000
Unrealized Gains	7
Unrealized Losses	0
Fair Value (Estimated)	5,007
Securities to be held to maturity, cost and FMV [Abstract]
Amortized Cost	11,155	11,155
Unrealized Gains	0	0
Unrealized Losses	(472)	(180)
Fair Value (Estimated)	10,683	10,975
Corporate securities
Securities to be held to maturity, cost and FMV [Abstract]
Amortized Cost	4,300	4,300
Unrealized Gains	0	0
Unrealized Losses	0	0
Fair Value (Estimated)	$ 4,300	4,300
Other equity securities
Debt Securities, Available-for-sale [Line Items]
Securities available-for-sale, Amortized Cost		323
Securities available-for-sale, Unrealized Gains		121
Securities available-for-sale, Unrealized Losses		(3)
Securities available-for-sale, Fair Value (Estimated)		$ 441

Investment Securities - Summa_2

Investment Securities - Summary of Contractual Maturities (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Available-for-sale Securities, Debt Maturities [Abstract]
Amortized Cost, Due in 1 year or less	$ 0	$ 111
Fair Value (Estimated), Due in 1 year or less	0	112
Amortized Cost, Due in 1 to 5 years	13,501	841
Fair Value (Estimated), Due in 1 to 5 years	13,518	842
Amortized Cost, Due in 5 to 10 years	83,954	29,003
Fair Value (Estimated), Due in 1 to 5 years	83,326	29,177
Amortized Cost, Due after 10 years	226,354	270,594
Fair Value (Estimated), Due after 10 years	220,572	266,627
Securities available-for-sale, Amortized Cost	323,809
Fair Value (Estimated)	317,416
Equity securities, Amortized Cost		323
Equity securities, Fair Value (Estimated)		441
Amortized Cost		300,872
Fair Value (Estimated)		297,199
Debt Securities, Held-to-maturity, Maturity [Abstract]
Amortized Cost, Due in 1 year or less	1,432	635
Fair Value (Estimated), Due in 1 year or less	1,433	637
Amortized Cost, Due in 1 to 5 years	20,717	18,059
Fair Value (Estimated), Due in 1 to 5 years	20,778	18,164
Amortized Cost, Due in 5 to 10 years	157,544	37,182
Fair Value (Estimated), Due in 1 to 5 years	155,313	37,719
Amortized Cost, Due after 10 years	75,970	200,691
Fair Value (Estimated), Due after 10 years	73,376	203,135
Amortized Cost	255,663	256,567
Fair Value (Estimated)	$ 250,900	$ 259,655

Investment Securities - Narrati

Investment Securities - Narrative (Details)	12 Months Ended
	Dec. 31, 2018USD ($)securitystate	Dec. 31, 2017USD ($)security	Sep. 30, 2014USD ($)
Debt Securities, Available-for-sale [Line Items]
Number of securities temporarily impaired (security) | security	511	241
Number of securities temporarily impaired for 12 months or more (security) | security	232	157
Period of temporary impairment	12 months	12 months
Amortized cost of securities transferred			$ 89,780,000
Fair value of securities transferred			89,757,000
Net unrealized losses on securities transferred			$ 15,000
Net unrealized loss on securities transferred from available for sale to held to maturity	$ 197,000	$ 174,000
Number of states | state	6
Federal Home Loan Bank Stock	$ 10,549,000	9,321,000
Impairment losses	0
Other equity securities
Debt Securities, Available-for-sale [Line Items]
Securities pledged as collateral	$ 222,829,000	$ 231,516,000

Investment Securities - Securit

Investment Securities - Securities Gains and Losses (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Investments, Debt and Equity Securities [Abstract]
Proceeds from sales of securities available for sale	$ 459	$ 15,587	$ 10,309
Gross realized gains	137
Gross realized gains		471	673
Gross realized losses	0
Gross realized losses		0	0
Net gain	137
Net gain	137	471	673
Related income taxes	$ 29	$ 165	$ 236

Investment Securities - Secur_2

Investment Securities - Securities Temporarily Impaired (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 152,859
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(2,845)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	240,871
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(10,271)
Debt Securities, Available-for-sale, Unrealized Loss Position	393,730
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	(13,116)
Less than 12 months, Fair Value		$ 148,611
Less than 12 months, Unrealized Losses		(2,100)
12 months or more, Fair Value		144,394
12 months or more, Unrealized Losses		(3,843)
Fair Value		293,005
Unrealized Losses		(5,943)
U.S. Government-sponsored agencies
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	10,683
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(472)
Debt Securities, Available-for-sale, Unrealized Loss Position	10,683
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	(472)
Less than 12 months, Fair Value		7,161
Less than 12 months, Unrealized Losses		(94)
12 months or more, Fair Value		3,814
12 months or more, Unrealized Losses		(86)
Fair Value		10,975
Unrealized Losses		(180)
Mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	76,050
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(1,061)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	185,136
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(5,926)
Debt Securities, Available-for-sale, Unrealized Loss Position	261,186
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	(6,987)
Less than 12 months, Fair Value		132,025
Less than 12 months, Unrealized Losses		(1,857)
12 months or more, Fair Value		101,707
12 months or more, Unrealized Losses		(2,693)
Fair Value		233,732
Unrealized Losses		(4,550)
State and political subdivisions
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	76,809
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(1,784)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	45,052
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(3,873)
Debt Securities, Available-for-sale, Unrealized Loss Position	121,861
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ (5,657)
Less than 12 months, Fair Value		9,425
Less than 12 months, Unrealized Losses		(149)
12 months or more, Fair Value		38,864
12 months or more, Unrealized Losses		(1,061)
Fair Value		48,289
Unrealized Losses		(1,210)
Other equity securities
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, Fair Value		0
Less than 12 months, Unrealized Losses		0
12 months or more, Fair Value		9
12 months or more, Unrealized Losses		(3)
Fair Value		9
Unrealized Losses		$ (3)

Mortgage Servicing Rights (Deta

Mortgage Servicing Rights (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Transfers and Servicing [Abstract]
Outstanding principal balance of loans serviced for others	$ 261,654	$ 260,258
Net gain from sale of loans	490	(737)	$ (1,211)
Mortgage servicing rights capitalized	291	567
Amortization of mortgage servicing rights	204	362
Fair value of mortgage servicing rights	$ 2,586	2,321
Moving average of weekly prepayment data (in months)	3 months
Anticipated loan prepayment rate of servicing assets (in hundredths)	7.74%
Servicing assets and servicing liabilities at fair value, assumptions used to estimate fair value, discount rate adjustment factor (in hundredths)	9.50%
Summary of mortgage servicing rights [Abstract]
Mortgage servicing rights	$ 5,718	5,428
Accumulated amortization	(4,364)	(4,160)
Mortgage servicing rights, net	$ 1,354	$ 1,268

Loans - Loan Portfolio (Details

Loans - Loan Portfolio (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 1,238,283	$ 1,164,139	$ 1,071,526
Percentage of loans receivable	100.00%	100.00%
Commercial | Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 353,243	$ 323,809	302,506
Percentage of loans receivable	28.50%	27.80%
Commercial | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 27,304	$ 38,056	25,406
Percentage of loans receivable	2.20%	3.30%
Commercial | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 196,391	$ 181,528	150,769
Percentage of loans receivable	15.90%	15.60%
Municipal
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 51,128	$ 33,391	27,056
Percentage of loans receivable	4.10%	2.90%
Residential | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 17,743	$ 17,868	18,303
Percentage of loans receivable	1.40%	1.50%
Residential | Term
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 469,145	$ 432,661	411,469
Percentage of loans receivable	37.90%	37.10%
Home Equity LIne of Credit
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 98,469	$ 111,302	110,907
Percentage of loans receivable	8.00%	9.60%
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 24,860	$ 25,524	$ 25,110
Percentage of loans receivable	2.00%	2.20%

Loans - Narrative (Details)

Loans - Narrative (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2018USD ($)loan	Dec. 31, 2017USD ($)loan	Dec. 31, 2016USD ($)
Schedule of Financing Receivables [Line Items]
Net deferred loan costs included in loan balances	$ 6,615	$ 5,748
Loans used to collateralize borrowings from the Federal Home Loan Bank of Boston	290,138	239,805
Commercial, construction and home equity loans used to collateralize unused line of credit at the Federal Reserve Bank of Boston	237,152	290,247
Nonaccrual loans	14,727	14,736
Interest income which would have been recognized on these loans, if interest had been accrued	811	496	$ 288
90 Plus Days And Accruing	351	445
Loans to directors, officers and employees	$ 34,566	$ 34,715
Number of loans | loan	76	62
TDR recorded investment	$ 25,222	$ 17,801
Number of loans | loan	9	12
TDR recorded investment more than 30 days past due	$ 1,013	$ 1,407
Number of loans placed on TDR status in previous 12 months | loan	0	0
Number of loans | loan	18
Loans classified as TDRs that are involved in bankruptcy	$ 935
Number of loans classified as TDRs that were on non-accrual status | loan	17
Loans classified as TDRs that were on non-accrual status	$ 8,197
Number of loans classified as TDRs that are involved in foreclosure | loan	3
Loans classified as TDRs that are involved in foreclosure	$ 398
Number of mortgage loans in the process of foreclosure | loan	11	12
Mortgage loans in the process of foreclosure	$ 1,131	$ 1,777
Loans Receivable in Bankruptcy
Schedule of Financing Receivables [Line Items]
Number of loans | loan	7

Loans - Summary of Loans to Dir

Loans - Summary of Loans to Directors and Executive Officers (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Loans and Leases Receivable, Related Parties [Roll Forward]
Beginning balance	$ 22,354	$ 23,293
New loans	1,341	867
Repayments	(1,192)	(1,806)
Retired director	(354)	0
Ending balance	$ 22,149	$ 22,354

Loans - Past-due Status of Loan

Loans - Past-due Status of Loans by Class (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	$ 13,375	$ 18,676
Current	1,224,908	1,145,463
Loans	1,238,283	1,164,139	$ 1,071,526
90 Plus Days And Accruing	351	445
Commercial | Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	2,051	874
Current	351,192	322,935
Loans	353,243	323,809	302,506
90 Plus Days And Accruing	0	0
Commercial | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	10	0
Current	27,294	38,056
Loans	27,304	38,056	25,406
90 Plus Days And Accruing	0	0
Commercial | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	580	7,779
Current	195,811	173,749
Loans	196,391	181,528	150,769
90 Plus Days And Accruing	0	0
Municipal
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	0	0
Current	51,128	33,391
Loans	51,128	33,391	27,056
90 Plus Days And Accruing	0	0
Residential | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	76	471
Current	17,667	17,397
Loans	17,743	17,868	18,303
90 Plus Days And Accruing	0	0
Residential | Term
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	6,638	7,659
Current	462,507	425,002
Loans	469,145	432,661	411,469
90 Plus Days And Accruing	339	436
Home Equity LIne of Credit
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	3,731	1,707
Current	94,738	109,595
Loans	98,469	111,302	110,907
90 Plus Days And Accruing	0	0
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	289	186
Current	24,571	25,338
Loans	24,860	25,524	$ 25,110
90 Plus Days And Accruing	12	9
30-59 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	5,958	2,944
30-59 Days Past Due | Commercial | Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	1,274	574
30-59 Days Past Due | Commercial | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	0	0
30-59 Days Past Due | Commercial | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	455	542
30-59 Days Past Due | Municipal
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	0	0
30-59 Days Past Due | Residential | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	76	101
30-59 Days Past Due | Residential | Term
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	1,097	1,031
30-59 Days Past Due | Home Equity LIne of Credit
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	2,819	537
30-59 Days Past Due | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	237	159
60-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	3,977	11,948
60-89 Days Past Due | Commercial | Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	0	80
60-89 Days Past Due | Commercial | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	10	0
60-89 Days Past Due | Commercial | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	5	6,663
60-89 Days Past Due | Municipal
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	0	0
60-89 Days Past Due | Residential | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	0	370
60-89 Days Past Due | Residential | Term
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	3,518	4,372
60-89 Days Past Due | Home Equity LIne of Credit
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	419	445
60-89 Days Past Due | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	25	18
90 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	3,440	3,784
90 Days Past Due | Commercial | Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	777	220
90 Days Past Due | Commercial | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	0	0
90 Days Past Due | Commercial | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	120	574
90 Days Past Due | Municipal
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	0	0
90 Days Past Due | Residential | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	0	0
90 Days Past Due | Residential | Term
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	2,023	2,256
90 Days Past Due | Home Equity LIne of Credit
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	493	725
90 Days Past Due | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	$ 27	$ 9

Loans - Nonaccrual Loans (Detai

Loans - Nonaccrual Loans (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans	$ 14,727	$ 14,736
Commercial | Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans	1,226	752
Commercial | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans	0	0
Commercial | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans	8,664	9,357
Municipal
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans	0	0
Residential | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans	0	0
Residential | Term
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans	4,062	3,778
Home Equity LIne of Credit
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans	760	833
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans	$ 15	$ 16

Loans - Information Regarding I

Loans - Information Regarding Impaired Loans (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Receivables [Abstract]
Average investment in impaired loans	$ 31,805	$ 29,108	$ 28,217
Interest income recognized on impaired loans, all on cash basis	864	784	1,104
Balance of impaired loans	31,751	31,392	27,583
Less portion for which no allowance for loan losses is allocated	(21,030)	(18,023)
Portion of impaired loan balance for which an allowance for loan losses is allocated	10,721	13,369
Portion of allowance for loan losses allocated to the impaired loan balance	$ 2,308	$ 1,812	$ 974

Loans - Impaired Loans by Class

Loans - Impaired Loans by Class (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Impaired Financing Receivable, Recorded Investment [Abstract]
Recorded Investment, No Related Allowance	$ 21,030	$ 18,023	$ 19,716
Recorded Investment, With Related Allowance	10,721	13,369	7,867
Balance of impaired loans	31,751	31,392	27,583
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]
Unpaid Principal Balance, No Related Allowance	22,831	19,775	21,853
Unpaid Principal Balance, With Related Allowance	11,397	13,698	8,116
Unpaid Principal Balance	34,228	33,473	29,969
Related Allowance	2,308	1,812	974
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Average Recorded Investment, No Related Allowance	18,776	19,227	19,605
Average Recorded Investment, With Related Allowance	13,029	9,881	8,612
Average Recorded Investment	31,805	29,108	28,217
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract]
Recognized Interest Income, No Related Allowance	764	553	781
Recognized Interest Income, With Related Allowance	100	231	323
Recognized Interest Income	864	784	1,104
Commercial | Real Estate
Impaired Financing Receivable, Recorded Investment [Abstract]
Recorded Investment, No Related Allowance	8,718	3,791	5,201
Recorded Investment, With Related Allowance	1,042	3,999	4,820
Balance of impaired loans	9,760	7,790	10,021
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]
Unpaid Principal Balance, No Related Allowance	9,161	3,996	5,614
Unpaid Principal Balance, With Related Allowance	1,059	4,116	4,925
Unpaid Principal Balance	10,220	8,112	10,539
Related Allowance	260	224	505
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Average Recorded Investment, No Related Allowance	5,536	5,124	6,252
Average Recorded Investment, With Related Allowance	3,477	4,460	4,153
Average Recorded Investment	9,013	9,584	10,405
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract]
Recognized Interest Income, No Related Allowance	380	164	220
Recognized Interest Income, With Related Allowance	42	152	186
Recognized Interest Income	422	316	406
Commercial | Construction
Impaired Financing Receivable, Recorded Investment [Abstract]
Recorded Investment, No Related Allowance	721	741	0
Recorded Investment, With Related Allowance	0	0	763
Balance of impaired loans	721	741	763
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]
Unpaid Principal Balance, No Related Allowance	721	741	0
Unpaid Principal Balance, With Related Allowance	0	0	763
Unpaid Principal Balance	721	741	763
Related Allowance	0	0	100
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Average Recorded Investment, No Related Allowance	762	62	32
Average Recorded Investment, With Related Allowance	0	699	816
Average Recorded Investment	762	761	848
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract]
Recognized Interest Income, No Related Allowance	43	38	0
Recognized Interest Income, With Related Allowance	0	0	36
Recognized Interest Income	43	38	36
Commercial | Other
Impaired Financing Receivable, Recorded Investment [Abstract]
Recorded Investment, No Related Allowance	1,468	2,591	1,671
Recorded Investment, With Related Allowance	7,791	7,327	72
Balance of impaired loans	9,259	9,918	1,743
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]
Unpaid Principal Balance, No Related Allowance	1,555	2,671	1,852
Unpaid Principal Balance, With Related Allowance	8,216	7,371	72
Unpaid Principal Balance	9,771	10,042	1,924
Related Allowance	1,696	1,309	39
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Average Recorded Investment, No Related Allowance	2,037	1,908	1,074
Average Recorded Investment, With Related Allowance	7,471	2,584	317
Average Recorded Investment	9,508	4,492	1,391
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract]
Recognized Interest Income, No Related Allowance	32	36	86
Recognized Interest Income, With Related Allowance	5	0	0
Recognized Interest Income	37	36	86
Municipal
Impaired Financing Receivable, Recorded Investment [Abstract]
Recorded Investment, No Related Allowance	0	0	0
Recorded Investment, With Related Allowance	0	0	0
Balance of impaired loans	0	0	0
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]
Unpaid Principal Balance, No Related Allowance	0	0	0
Unpaid Principal Balance, With Related Allowance	0	0	0
Unpaid Principal Balance	0	0	0
Related Allowance	0	0	0
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Average Recorded Investment, No Related Allowance	0	0	0
Average Recorded Investment, With Related Allowance	0	0	0
Average Recorded Investment	0	0	0
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract]
Recognized Interest Income, No Related Allowance	0	0	0
Recognized Interest Income, With Related Allowance	0	0	0
Recognized Interest Income	0	0	0
Residential | Construction
Impaired Financing Receivable, Recorded Investment [Abstract]
Recorded Investment, No Related Allowance	0	0	0
Recorded Investment, With Related Allowance	0	0	0
Balance of impaired loans	0	0	0
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]
Unpaid Principal Balance, No Related Allowance	0	0	0
Unpaid Principal Balance, With Related Allowance	0	0	0
Unpaid Principal Balance	0	0	0
Related Allowance	0	0	0
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Average Recorded Investment, No Related Allowance	0	0	0
Average Recorded Investment, With Related Allowance	0	0	0
Average Recorded Investment	0	0	0
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract]
Recognized Interest Income, No Related Allowance	0	0	0
Recognized Interest Income, With Related Allowance	0	0	0
Recognized Interest Income	0	0	0
Residential | Term
Impaired Financing Receivable, Recorded Investment [Abstract]
Recorded Investment, No Related Allowance	9,136	9,769	11,483
Recorded Investment, With Related Allowance	1,768	1,979	2,186
Balance of impaired loans	10,904	11,748	13,669
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]
Unpaid Principal Balance, No Related Allowance	10,317	10,909	12,654
Unpaid Principal Balance, With Related Allowance	1,998	2,144	2,328
Unpaid Principal Balance	12,315	13,053	14,982
Related Allowance	335	255	304
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Average Recorded Investment, No Related Allowance	9,427	10,770	11,025
Average Recorded Investment, With Related Allowance	1,982	2,106	3,209
Average Recorded Investment	11,409	12,876	14,234
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract]
Recognized Interest Income, No Related Allowance	289	297	442
Recognized Interest Income, With Related Allowance	53	79	101
Recognized Interest Income	342	376	543
Home Equity LIne of Credit
Impaired Financing Receivable, Recorded Investment [Abstract]
Recorded Investment, No Related Allowance	972	1,115	1,361
Recorded Investment, With Related Allowance	120	64	26
Balance of impaired loans	1,092	1,179	1,387
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]
Unpaid Principal Balance, No Related Allowance	1,035	1,429	1,733
Unpaid Principal Balance, With Related Allowance	124	67	28
Unpaid Principal Balance	1,159	1,496	1,761
Related Allowance	17	24	26
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Average Recorded Investment, No Related Allowance	1,001	1,351	1,213
Average Recorded Investment, With Related Allowance	99	32	69
Average Recorded Investment	1,100	1,383	1,282
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract]
Recognized Interest Income, No Related Allowance	20	18	33
Recognized Interest Income, With Related Allowance	0	0	0
Recognized Interest Income	20	18	33
Consumer
Impaired Financing Receivable, Recorded Investment [Abstract]
Recorded Investment, No Related Allowance	15	16	0
Recorded Investment, With Related Allowance	0	0	0
Balance of impaired loans	15	16	0
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]
Unpaid Principal Balance, No Related Allowance	42	29	0
Unpaid Principal Balance, With Related Allowance	0	0	0
Unpaid Principal Balance	42	29	0
Related Allowance	0	0	0
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Average Recorded Investment, No Related Allowance	13	12	9
Average Recorded Investment, With Related Allowance	0	0	48
Average Recorded Investment	13	12	57
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract]
Recognized Interest Income, No Related Allowance	0	0	0
Recognized Interest Income, With Related Allowance	0	0	0
Recognized Interest Income	$ 0	$ 0	$ 0

Loans - TDRs by Class and Speci

Loans - TDRs by Class and Specific Reserve (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2018USD ($)loan	Dec. 31, 2017USD ($)loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | loan	76	62
Balance	$ 25,222	$ 17,801
Specific Reserves	$ 1,568	$ 323
Commercial | Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | loan	17	8
Balance	$ 8,631	$ 7,038
Specific Reserves	$ 132	$ 90
Commercial | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | loan	1	1
Balance	$ 721	$ 741
Specific Reserves	$ 0	$ 0
Commercial | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | loan	10	4
Balance	$ 7,298	$ 561
Specific Reserves	$ 1,276	$ 0
Municipal
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | loan	0	0
Balance	$ 0	$ 0
Specific Reserves	$ 0	$ 0
Residential | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | loan	0	0
Balance	$ 0	$ 0
Specific Reserves	$ 0	$ 0
Residential | Term
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | loan	45	46
Balance	$ 8,074	$ 8,948
Specific Reserves	$ 160	$ 233
Home Equity LIne of Credit
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | loan	3	3
Balance	$ 498	$ 513
Specific Reserves	$ 0	$ 0
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | loan	0	0
Balance	$ 0	$ 0
Specific Reserves	$ 0	$ 0

Loans - TDRs by Class and Assoc

Loans - TDRs by Class and Associated Specific Reserves (Details) $ in Thousands	Dec. 31, 2018USD ($)loan	Dec. 31, 2017USD ($)loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | loan	9	12
Balance	$ 1,013	$ 1,407
Specific Reserves	$ 26	$ 44
Commercial | Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | loan	0	0
Balance	$ 0	$ 0
Specific Reserves	$ 0	$ 0
Commercial | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | loan	0	0
Balance	$ 0	$ 0
Specific Reserves	$ 0	$ 0
Commercial | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | loan	0	0
Balance	$ 0	$ 0
Specific Reserves	$ 0	$ 0
Municipal
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | loan	0	0
Balance	$ 0	$ 0
Specific Reserves	$ 0	$ 0
Residential | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | loan	0	0
Balance	$ 0	$ 0
Specific Reserves	$ 0	$ 0
Residential | Term
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | loan	8	11
Balance	$ 846	$ 1,240
Specific Reserves	$ 26	$ 44
Home Equity LIne of Credit
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | loan	1	1
Balance	$ 167	$ 167
Specific Reserves	$ 0	$ 0
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | loan	0	0
Balance	$ 0	$ 0
Specific Reserves	$ 0	$ 0

Loans - Pre-Modification and Po

Loans - Pre-Modification and Post-Modification Outstanding Recorded Investment (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2018USD ($)loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | loan	18
Pre-Modification Outstanding Recorded Investment	$ 9,365
Post-Modification Outstanding Recorded Investment	9,032
Specific Reserves	$ 1,344
Commercial | Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | loan	9
Pre-Modification Outstanding Recorded Investment	$ 1,729
Post-Modification Outstanding Recorded Investment	1,727
Specific Reserves	$ 42
Commercial | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | loan	0
Pre-Modification Outstanding Recorded Investment	$ 0
Post-Modification Outstanding Recorded Investment	0
Specific Reserves	$ 0
Commercial | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | loan	6
Pre-Modification Outstanding Recorded Investment	$ 7,116
Post-Modification Outstanding Recorded Investment	6,798
Specific Reserves	$ 1,276
Municipal
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | loan	0
Pre-Modification Outstanding Recorded Investment	$ 0
Post-Modification Outstanding Recorded Investment	0
Specific Reserves	$ 0
Residential | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | loan	0
Pre-Modification Outstanding Recorded Investment	$ 0
Post-Modification Outstanding Recorded Investment	0
Specific Reserves	$ 0
Residential | Term
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | loan	3
Pre-Modification Outstanding Recorded Investment	$ 520
Post-Modification Outstanding Recorded Investment	507
Specific Reserves	$ 26
Home Equity LIne of Credit
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | loan	0
Pre-Modification Outstanding Recorded Investment	$ 0
Post-Modification Outstanding Recorded Investment	0
Specific Reserves	$ 0
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | loan	0
Pre-Modification Outstanding Recorded Investment	$ 0
Post-Modification Outstanding Recorded Investment	0
Specific Reserves	$ 0

Allowance for Loan Losses - Com

Allowance for Loan Losses - Composition of Allowance for Loans Losses, by Class (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for Loans Evaluated Individually for Impairment	$ 2,308	$ 1,812	$ 974
Allowance for Loans Evaluated Collectively for Impairment	8,924	8,917	9,164
Total Allowance for Loan Losses	11,232	10,729	10,138	$ 9,916
Commercial | Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for Loans Evaluated Individually for Impairment	260	224	505
Allowance for Loans Evaluated Collectively for Impairment	3,307	3,648	3,483
Total Allowance for Loan Losses	3,567	3,872	3,988	3,120
Commercial | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for Loans Evaluated Individually for Impairment	0	0	100
Allowance for Loans Evaluated Collectively for Impairment	255	434	296
Total Allowance for Loan Losses	255	434	396	580
Commercial | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for Loans Evaluated Individually for Impairment	1,696	1,309	39
Allowance for Loans Evaluated Collectively for Impairment	1,845	2,049	1,741
Total Allowance for Loan Losses	3,541	3,358	1,780	1,452
Municipal
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for Loans Evaluated Individually for Impairment	0	0	0
Allowance for Loans Evaluated Collectively for Impairment	24	20	18
Total Allowance for Loan Losses	24	20	18	17
Residential | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for Loans Evaluated Individually for Impairment	0	0	0
Allowance for Loans Evaluated Collectively for Impairment	34	36	44
Total Allowance for Loan Losses	34	36	44	24
Residential | Term
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for Loans Evaluated Individually for Impairment	335	255	304
Allowance for Loans Evaluated Collectively for Impairment	900	875	984
Total Allowance for Loan Losses	1,235	1,130	1,288	1,391
Home Equity LIne of Credit
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for Loans Evaluated Individually for Impairment	17	24	26
Allowance for Loans Evaluated Collectively for Impairment	713	668	781
Total Allowance for Loan Losses	730	692	807	893
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for Loans Evaluated Individually for Impairment	0	0	0
Allowance for Loans Evaluated Collectively for Impairment	630	545	559
Total Allowance for Loan Losses	630	545	559	566
Unallocated
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for Loans Evaluated Individually for Impairment	0	0	0
Allowance for Loans Evaluated Collectively for Impairment	1,216	642	1,258
Total Allowance for Loan Losses	$ 1,216	$ 642	$ 1,258	$ 1,873

Allowance for Loan Losses - Fin

Allowance for Loan Losses - Financing Receivable and Allowance Element by Class (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	$ 11,232	$ 10,729	$ 10,138	$ 9,916
Commercial | Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	3,567	3,872	3,988	3,120
Commercial | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	255	434	396	580
Commercial | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	3,541	3,358	1,780	1,452
Municipal
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	24	20	18	17
Residential | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	34	36	44	24
Residential | Term
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	1,235	1,130	1,288	1,391
Home Equity LIne of Credit
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	730	692	807	893
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	630	545	559	566
Unallocated
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	1,216	642	$ 1,258	$ 1,873
Specific Reserves on Loans Evaluated Individually for Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	2,308	1,812
Specific Reserves on Loans Evaluated Individually for Impairment | Commercial | Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	260	224
Specific Reserves on Loans Evaluated Individually for Impairment | Commercial | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	0	0
Specific Reserves on Loans Evaluated Individually for Impairment | Commercial | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	1,696	1,309
Specific Reserves on Loans Evaluated Individually for Impairment | Municipal
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	0	0
Specific Reserves on Loans Evaluated Individually for Impairment | Residential | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	0	0
Specific Reserves on Loans Evaluated Individually for Impairment | Residential | Term
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	335	255
Specific Reserves on Loans Evaluated Individually for Impairment | Home Equity LIne of Credit
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	17	24
Specific Reserves on Loans Evaluated Individually for Impairment | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	0	0
Specific Reserves on Loans Evaluated Individually for Impairment | Unallocated
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	0	0
General Reserves on Loans Based on Historical Loss Experience
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	2,085	3,033
General Reserves on Loans Based on Historical Loss Experience | Commercial | Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	742	1,285
General Reserves on Loans Based on Historical Loss Experience | Commercial | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	57	153
General Reserves on Loans Based on Historical Loss Experience | Commercial | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	414	723
General Reserves on Loans Based on Historical Loss Experience | Municipal
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	0	0
General Reserves on Loans Based on Historical Loss Experience | Residential | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	12	13
General Reserves on Loans Based on Historical Loss Experience | Residential | Term
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	326	311
General Reserves on Loans Based on Historical Loss Experience | Home Equity LIne of Credit
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	263	297
General Reserves on Loans Based on Historical Loss Experience | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	271	251
General Reserves on Loans Based on Historical Loss Experience | Unallocated
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	0	0
Reserves for Qualitative Factors
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	5,623	5,242
Reserves for Qualitative Factors | Commercial | Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	2,565	2,363
Reserves for Qualitative Factors | Commercial | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	198	281
Reserves for Qualitative Factors | Commercial | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	1,431	1,326
Reserves for Qualitative Factors | Municipal
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	24	20
Reserves for Qualitative Factors | Residential | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	22	23
Reserves for Qualitative Factors | Residential | Term
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	574	564
Reserves for Qualitative Factors | Home Equity LIne of Credit
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	450	371
Reserves for Qualitative Factors | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	359	294
Reserves for Qualitative Factors | Unallocated
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	0	0
Unallocated Reserves
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	1,216	642
Unallocated Reserves | Commercial | Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	0	0
Unallocated Reserves | Commercial | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	0	0
Unallocated Reserves | Commercial | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	0	0
Unallocated Reserves | Municipal
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	0	0
Unallocated Reserves | Residential | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	0	0
Unallocated Reserves | Residential | Term
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	0	0
Unallocated Reserves | Home Equity LIne of Credit
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	0	0
Unallocated Reserves | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	0	0
Unallocated Reserves | Unallocated
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	$ 1,216	$ 642

Allowance for Loan Losses - Nar

Allowance for Loan Losses - Narrative (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2018USD ($)loan_class	Dec. 31, 2017USD ($)	Dec. 31, 2016USD ($)	Dec. 31, 2015USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percent of related loans	0.45%
Increase (decrease) in qualitative portion	$ 381
Allowance for loan losses	$ 11,232	$ 10,729	$ 10,138	$ 9,916
Allowance for loan losses as a percent of total loans	0.91%	0.92%
Number of commercial loan classes | loan_class	3
Loan-to-value percent, commercial real estate	80.00%
Number of residential loan classes | loan_class	2
Construction loans, percent of capital	25.70%
Construction loans, maximum percent of capital	100.00%
Construction loans and non-owner-occupied commercial real estate loans, percent of capital	126.40%
Construction loans and non-owner-occupied commercial real estate loans, maximum percent of capital	300.00%
Outstanding loans and commitments subject by independent consulting firm	60.00%
Residential loans, loan to value percent minimum	75.00%
Residential loans, loan to value percent, maximum	80.00%
Consumer loans, loan to value percent, minimum	80.00%
Consumer loans, loan to value percent, maximum	90.00%
Commercial | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	$ 255	$ 434	396	580
Loan maturities	2 years
Home Equity LIne of Credit
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	$ 730	692	807	893
Loan maturities	300 months
Loan to value ratio	0.80
Residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan to value ratio	0.80
Amortization term (in years)	30 years
Delinquent period before residential loans are placed on non-accrual status	90 days
Delinquent period for loans charged off	180 days
Delinquent period for loans charged off after receipt of notification	60 days
Residential | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	$ 34	36	44	24
Loan maturities	1 year
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	$ 630	545	$ 559	$ 566
Delinquent period before consumer loans are charged off	120 days
Unallocated Reserves
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	$ 1,216	$ 642
Percent of total allowance reserve	10.80%	6.00%
Unallocated Reserves | Commercial | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	$ 0	$ 0
Unallocated Reserves | Home Equity LIne of Credit
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	0	0
Unallocated Reserves | Residential | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	0	0
Unallocated Reserves | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	$ 0	$ 0

Allowance for Loan Losses - Ris

Allowance for Loan Losses - Risk Ratings by Segment (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	$ 628,066	$ 576,784
Commercial | Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	353,243	323,809
Commercial | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	27,304	38,056
Commercial | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	196,391	181,528
Municipal
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	51,128	33,391
1 Strong
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	3,444	1,586
1 Strong | Commercial | Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	0	0
1 Strong | Commercial | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	0	0
1 Strong | Commercial | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	3,444	1,586
1 Strong | Municipal
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	0	0
2 Above average
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	63,885	51,023
2 Above average | Commercial | Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	10,484	12,534
2 Above average | Commercial | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	37	40
2 Above average | Commercial | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	4,564	5,776
2 Above average | Municipal
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	48,800	32,673
3 Satisfactory
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	129,105	115,624
3 Satisfactory | Commercial | Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	80,266	73,899
3 Satisfactory | Commercial | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	2,231	2,856
3 Satisfactory | Commercial | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	46,090	38,151
3 Satisfactory | Municipal
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	518	718
4 Average
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	275,268	280,762
4 Average | Commercial | Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	172,597	173,956
4 Average | Commercial | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	18,780	22,446
4 Average | Commercial | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	82,081	84,360
4 Average | Municipal
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	1,810	0
5 Watch
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	117,841	88,300
5 Watch | Commercial | Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	66,325	41,652
5 Watch | Commercial | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	5,970	12,714
5 Watch | Commercial | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	45,546	33,934
5 Watch | Municipal
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	0	0
6 OAEM
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	8,695	6,207
6 OAEM | Commercial | Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	6,890	3,442
6 OAEM | Commercial | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	0	0
6 OAEM | Commercial | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	1,805	2,765
6 OAEM | Municipal
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	0	0
8 Doubtful
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	29,705	33,159
8 Doubtful | Commercial | Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	16,558	18,203
8 Doubtful | Commercial | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	286	0
8 Doubtful | Commercial | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	12,861	14,956
8 Doubtful | Municipal
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	0	0
8 Doubtful
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	123	123
8 Doubtful | Commercial | Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	123	123
8 Doubtful | Commercial | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	0	0
8 Doubtful | Commercial | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	0	0
8 Doubtful | Municipal
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	$ 0	$ 0

Allowance for Loan Losses - Act

Allowance for Loan Losses - Activity by Class (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance				$ 10,729				$ 10,138	$ 10,729	$ 10,138	$ 9,916
Chargeoffs									1,273	1,618	1,721
Recoveries									276	209	343
Provision for loan losses	$ 167	$ 333	$ 500	500	$ 250	$ 750	$ 500	500	1,500	2,000	1,600
Ending balance	11,232				10,729				11,232	10,729	10,138
Ending balance specifically evaluated for impairment	2,308				1,812				2,308	1,812	974
Ending balance collectively evaluated for impairment	8,924				8,917				8,924	8,917	9,164
Loans	1,238,283				1,164,139				1,238,283	1,164,139	1,071,526
Ending balance specifically evaluated for impairment	31,751				31,392				31,751	31,392	27,583
Ending balance collectively evaluated for impairment	1,206,532				1,132,747				1,206,532	1,132,747	1,043,943
Commercial | Real Estate
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance				3,872				3,988	3,872	3,988	3,120
Chargeoffs									168	587	294
Recoveries									52	0	0
Provision for loan losses									(189)	471	1,162
Ending balance	3,567				3,872				3,567	3,872	3,988
Ending balance specifically evaluated for impairment	260				224				260	224	505
Ending balance collectively evaluated for impairment	3,307				3,648				3,307	3,648	3,483
Loans	353,243				323,809				353,243	323,809	302,506
Ending balance specifically evaluated for impairment	9,760				7,790				9,760	7,790	10,021
Ending balance collectively evaluated for impairment	343,483				316,019				343,483	316,019	292,485
Commercial | Construction
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance				434				396	434	396	580
Chargeoffs									0	0	75
Recoveries									0	0	8
Provision for loan losses									(179)	38	(117)
Ending balance	255				434				255	434	396
Ending balance specifically evaluated for impairment	0				0				0	0	100
Ending balance collectively evaluated for impairment	255				434				255	434	296
Loans	27,304				38,056				27,304	38,056	25,406
Ending balance specifically evaluated for impairment	721				741				721	741	763
Ending balance collectively evaluated for impairment	26,583				37,315				26,583	37,315	24,643
Commercial | Other
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance				3,358				1,780	3,358	1,780	1,452
Chargeoffs									423	212	376
Recoveries									40	49	129
Provision for loan losses									566	1,741	575
Ending balance	3,541				3,358				3,541	3,358	1,780
Ending balance specifically evaluated for impairment	1,696				1,309				1,696	1,309	39
Ending balance collectively evaluated for impairment	1,845				2,049				1,845	2,049	1,741
Loans	196,391				181,528				196,391	181,528	150,769
Ending balance specifically evaluated for impairment	9,259				9,918				9,259	9,918	1,743
Ending balance collectively evaluated for impairment	187,132				171,610				187,132	171,610	149,026
Municipal
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance				20				18	20	18	17
Chargeoffs									0	0	0
Recoveries									0	0	0
Provision for loan losses									4	2	1
Ending balance	24				20				24	20	18
Ending balance specifically evaluated for impairment	0				0				0	0	0
Ending balance collectively evaluated for impairment	24				20				24	20	18
Loans	51,128				33,391				51,128	33,391	27,056
Ending balance specifically evaluated for impairment	0				0				0	0	0
Ending balance collectively evaluated for impairment	51,128				33,391				51,128	33,391	27,056
Residential | Construction
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance				36				44	36	44	24
Chargeoffs									0	0	0
Recoveries									0	0	0
Provision for loan losses									(2)	(8)	20
Ending balance	34				36				34	36	44
Ending balance specifically evaluated for impairment	0				0				0	0	0
Ending balance collectively evaluated for impairment	34				36				34	36	44
Loans	17,743				17,868				17,743	17,868	18,303
Ending balance specifically evaluated for impairment	0				0				0	0	0
Ending balance collectively evaluated for impairment	17,743				17,868				17,743	17,868	18,303
Residential | Term
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance				1,130				1,288	1,130	1,288	1,391
Chargeoffs									213	456	379
Recoveries									64	40	93
Provision for loan losses									254	258	183
Ending balance	1,235				1,130				1,235	1,130	1,288
Ending balance specifically evaluated for impairment	335				255				335	255	304
Ending balance collectively evaluated for impairment	900				875				900	875	984
Loans	469,145				432,661				469,145	432,661	411,469
Ending balance specifically evaluated for impairment	10,904				11,748				10,904	11,748	13,669
Ending balance collectively evaluated for impairment	458,241				420,913				458,241	420,913	397,800
Home Equity LIne of Credit
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance				692				807	692	807	893
Chargeoffs									121	28	147
Recoveries									24	11	5
Provision for loan losses									135	(98)	56
Ending balance	730				692				730	692	807
Ending balance specifically evaluated for impairment	17				24				17	24	26
Ending balance collectively evaluated for impairment	713				668				713	668	781
Loans	98,469				111,302				98,469	111,302	110,907
Ending balance specifically evaluated for impairment	1,092				1,179				1,092	1,179	1,387
Ending balance collectively evaluated for impairment	97,377				110,123				97,377	110,123	109,520
Consumer
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance				545				559	545	559	566
Chargeoffs									348	335	450
Recoveries									96	109	108
Provision for loan losses									337	212	335
Ending balance	630				545				630	545	559
Ending balance specifically evaluated for impairment	0				0				0	0	0
Ending balance collectively evaluated for impairment	630				545				630	545	559
Loans	24,860				25,524				24,860	25,524	25,110
Ending balance specifically evaluated for impairment	15				16				15	16	0
Ending balance collectively evaluated for impairment	24,845				25,508				24,845	25,508	25,110
Unallocated
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance				$ 642				$ 1,258	642	1,258	1,873
Chargeoffs									0	0	0
Recoveries									0	0	0
Provision for loan losses									574	(616)	(615)
Ending balance	1,216				642				1,216	642	1,258
Ending balance specifically evaluated for impairment	0				0				0	0	0
Ending balance collectively evaluated for impairment	1,216				642				1,216	642	1,258
Loans	0				0				0	0	0
Ending balance specifically evaluated for impairment	0				0				0	0	0
Ending balance collectively evaluated for impairment	$ 0				$ 0				$ 0	$ 0	$ 0

Premises and Equipment - Schedu

Premises and Equipment - Schedule of Premises and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	$ 40,719	$ 41,092
Less accumulated depreciation	18,663	18,590
Premises and equipment, net	22,056	22,502
Land
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	4,852	4,639
Land improvements
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	1,105	1,052
Buildings
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	22,301	22,254
Equipment
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	$ 12,461	$ 13,147

Premises and Equipment - Antici

Premises and Equipment - Anticipated Rental Revenue (Details) $ in Thousands	Dec. 31, 2018USD ($)
Property, Plant and Equipment [Abstract]
2,019	$ 141
2,020	101
2,021	97
2,022	94
2,023	9
Thereafter	0
Total	$ 442

Other Real Estate Owned (Detail

Other Real Estate Owned (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Summary Other Real Estate Owned [Abstract]
Real estate acquired in settlement of loans	$ 584	$ 1,012
Real Estate Owned Valuation Allowance [Roll Forward]
Balance at beginning of year	53	205	$ 162
Losses charged to allowance	(53)	(169)	(89)
Provision charged to operating expenses	0	17	132
Balance at end of year	$ 0	$ 53	$ 205

Income Taxes (Details)

Income Taxes (Details) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018USD ($)limited_partnership	Sep. 30, 2018USD ($)	Jun. 30, 2018USD ($)	Mar. 31, 2018USD ($)	Dec. 31, 2017USD ($)limited_partnership	Sep. 30, 2017USD ($)	Jun. 30, 2017USD ($)	Mar. 31, 2017USD ($)	Dec. 31, 2018USD ($)limited_partnership	Dec. 31, 2017USD ($)limited_partnership	Dec. 31, 2016USD ($)
Federal income tax
Current									$ 4,407	$ 4,184	$ 6,276
Deferred									(492)	2,083	(139)
Federal income tax expense									3,915	6,267	6,137
State franchise tax									391	345	317
Income tax expense	$ 1,222	$ 1,088	$ 1,040	$ 956	$ 1,782	$ 1,702	$ 1,644	$ 1,484	4,306	6,612	6,454
Reconciliation between US expected tax rate and actual tax expense
Expected tax expense									5,847	9,170	8,562
Non-taxable income									(1,699)	(2,625)	(2,176)
State franchise tax, net of federal tax benefit									309	224	206
Equity compensation									(55)	(83)	0
Tax credits, net of amortization									(85)	(88)	(105)
Change in federal tax rate									0	134	0
Other									(11)	(120)	(33)
Income tax expense	1,222	$ 1,088	$ 1,040	$ 956	1,782	$ 1,702	$ 1,644	$ 1,484	4,306	6,612	$ 6,454
Components of deferred tax assets and liabilities
Allowance for loan losses	2,359				2,253				2,359	2,253
OREO	0				11				0	11
Accrued pension and post-retirement	955				1,036				955	1,036
Unrealized loss on securities transferred from available for sale to held to maturity	52				46				52	46
Unrealized loss on securities available for sale	1,343				772				1,343	772
Restricted stock grants	170				173				170	173
Core deposit intangible	18				15				18	15
Investment in flow through entities	31				22				31	22
Other assets	24				28				24	28
Total deferred tax asset	4,952				4,356				4,952	4,356
Net deferred loan costs	(1,504)				(1,313)				(1,504)	(1,313)
Depreciation	(1,300)				(1,306)				(1,300)	(1,306)
Goodwill	(80)				(39)				(80)	(39)
Mortgage servicing rights	(284)				(266)				(284)	(266)
Unrealized gain on derivative instruments	(382)				(410)				(382)	(410)
Prepaid expense	(159)				(821)				(159)	(821)
Total deferred tax liability	(3,709)				(4,155)				(3,709)	(4,155)
Net deferred tax asset	$ 1,243				$ 201				$ 1,243	$ 201
Limited partnerships
Limited partnerships held as investments | limited_partnership	3				2				3	2
Tax credits from investments in limited partnerships									$ 210	$ 204
Amortization of investments in limited partnerships									186	178
Carrying value of investments in limited partnerships	$ 1,408				$ 1,408				1,408	1,408
Total exposure to limited partnerships	$ 1,408				$ 1,408				$ 1,408	$ 1,408

Certificates of Deposit (Detail

Certificates of Deposit (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Maturities Of Certificates Of Deposit [Line Items]
Certificates of deposit less than $100,000	$ 372,464	$ 284,066
Certificates $100,000 to $250,000	162,185	232,759
Certificates $250,000 and over	56,760	42,176
Total	591,409	559,001
Maturity of certificates of deposit [Abstract]
2,019	411,809
2,020	61,196
2,021	44,607
2,022	27,583
2,023	46,208
2024 and thereafter	6
Total	591,409	559,001
Interest expense on certificates of deposit of $100,000 or greater	3,038	$ 2,105	$ 1,970
Less than $100,000
Maturities Of Certificates Of Deposit [Line Items]
Total	372,464
Maturity of certificates of deposit [Abstract]
2,019	303,468
2,020	25,150
2,021	20,073
2,022	10,752
2,023	13,015
2024 and thereafter	6
Total	372,464
$100,000 and Greater
Maturities Of Certificates Of Deposit [Line Items]
Total	218,945
Maturity of certificates of deposit [Abstract]
2,019	108,341
2,020	36,046
2,021	24,534
2,022	16,831
2,023	33,193
2024 and thereafter	0
Total	$ 218,945

Borrowed Funds (Details)

Borrowed Funds (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017
Disclosure of Repurchase Agreements [Abstract]
Range of repurchase agreements' maturity dates	one to 365
Amount of line of credit with correspondent banks	$ 46,000
Credit facility with Federal Reserve Bank	$ 84,000
Federal Home Loan Bank, Advances, Maturities Summary [Abstract]
Interest rate, due in year three	1.55%
Interest rate, due in year four		1.55%
Interest rate, due thereafter	0.00%
Due in twelve months maturity	$ 105,000	$ 43,074
Due in year two maturity	55,000
Due in year three maturity	10,000	55,000
Due in year four maturity		10,000
Due thereafter	112	50,120
Total	170,112	158,194
Repurchase agreements for municipal and commercial customers	40,205	70,564
Total	$ 210,317	$ 228,758	$ 265,274	$ 297,455	$ 244,229	$ 234,328	$ 282,277	$ 226,467
Minimum
Disclosure of Repurchase Agreements [Abstract]
Range of repurchase agreements' maturity dates (days)	1 day
Federal Home Loan Bank, Advances, Maturities Summary [Abstract]
Interest rate, due in next twelve months	2.25%	1.59%
Interest rate, due in year two	1.60%
Interest rate, due in year three		1.60%
Interest rate, due thereafter		0.00%
Interest rate, Repurchase agreements for municipal and commercial customers	0.15%	0.15%
Maximum
Disclosure of Repurchase Agreements [Abstract]
Range of repurchase agreements' maturity dates (days)	365 days
Federal Home Loan Bank, Advances, Maturities Summary [Abstract]
Interest rate, due in next twelve months	2.58%	3.25%
Interest rate, due in year two	1.97%
Interest rate, due in year three		1.97%
Interest rate, due thereafter		0.99%
Interest rate, Repurchase agreements for municipal and commercial customers	2.00%	2.48%

Employee Benefit Plans (Details

Employee Benefit Plans (Details)	12 Months Ended
	Dec. 31, 2018USD ($)planemployee	Dec. 31, 2017USD ($)	Dec. 31, 2016USD ($)
Defined contribution plan [Abstract]
Defined contribution plan service period (in months)	3 months
Defined contribution plan employer maximum percentage match of annual salary based on employee contribution (in hundredths)	3.00%
Defined contribution plan employer maximum percentage of annual profit-sharing contribution to plan for benefit of employee (in hundredths)	2.00%	2.00%	2.00%
Expense related to 401(k) plan	$ 578,000	$ 554,000	$ 435,000
Defined benefit plans, general information	The Bank also provides unfunded supplemental retirement benefits for certain officers, payable in installments over 20 years commencing upon retirement or death. The agreements consist of individual contracts with differing characteristics that, when taken together, do not constitute a post-retirement plan.
Non-qualified deferred compensation payable period (in years)	2 years
Supplemental retirement benefits, period of benefits to be received	20 years
Pension expense	$ 176,000	219,000	$ 215,000
Accrued pension liability	$ 2,949,000	$ 3,060,000
Number of post-retirement benefit plans | plan	2
Number of active employees aged 50 and over | employee	6
Employee benefit plan age (in years)	50 years
Post-retirement benefit plan health insurance subsidy range minimum per month per person	$ 40
Post-retirement benefit plan health insurance subsidy range maximum per month per person	1,200
Expected future benefit payments in 2019	113,000
Expected future benefit payments in 2020	112,000
Expected future benefit payments in 2021	111,000
Expected future benefit payments in 2022	109,000
Expected future benefit payments in 2023	108,000
Expected future benefit payments in 2023 through 2027	604,000
Estimated plan expense	$ 66,000
Federal statutory income tax rate (percent)	21.00%	35.00%

Employee Benefit Plans - Accumu

Employee Benefit Plans - Accumulated Post-Retirement Benefit Obligation, Funded Status, and Net Periodic Benefit Cost (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2018USD ($)	Dec. 31, 2017USD ($)	Dec. 31, 2016USD ($)	Dec. 31, 2018USD ($)	Dec. 31, 2017USD ($)	Dec. 31, 2016USD ($)
Change in Benefit Obligations [Roll Forward]
Benefit obligation at beginning of year	$ 1,874	$ 1,870	$ 1,967
Interest cost	77	77	81
Benefits paid	(117)	(113)	(109)
Actuarial (gain) loss				$ (235)	$ 40	$ (69)
Benefit obligation at end of period	1,599	1,874	1,870
Funded Status of Plan [Abstract]
Benefit obligation at end of period	(1,599)	(1,874)	(1,967)	(1,599)	(1,874)	(1,870)
Unamortized (gain) loss				(47)	186	156
Accrued benefit cost				$ (1,646)	$ (1,688)	$ (1,714)
Weighted average discount rate as of December 31				0.0425	0.0425	0.0425
Components of Net Periodic Benefit Cost [Abstract]
Interest cost	77	77	81
Amortization of loss	0	0	4
Other settlement (income) expense	(3)	11	11
Net periodic benefit cost	$ 74	$ 88	$ 96
Weighted average discount rate for net periodic cost	4.25%	4.25%	4.25%

Employee Benefit Plans - Schedu

Employee Benefit Plans - Schedule of Net Periodic Benefit Cost Not Yet Recognized (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Retirement Benefits, Description [Abstract]
Unamortized net actuarial gain (loss)	$ 47	$ (186)
Deferred tax (expense) benefit at 21% in 2018 and 35% in 2017	(10)	65
Reclassification adjustment for effect of enacted tax law changes	0	(26)
Net unrecognized post-retirement benefits included in accumulated other comprehensive income (loss)	37	$ (147)
Portion to Be Recognized in Income in 2019
Unamortized net actuarial gain (loss)	(160)
Deferred tax (expense) benefit at 21% in 2018 and 35% in 2017	34
Reclassification adjustment for effect of enacted tax law changes	0
Net unrecognized post-retirement benefits included in accumulated other comprehensive income (loss)	$ (126)

Other Comprehensive Income (L_3

Other Comprehensive Income (Loss), Summary of Unrealized Gains and Losses on Available-for-Sale Securities (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward]
Balance	$ 184,661	$ 183,304	$ 181,372	$ 181,321	$ 179,882	$ 177,537	$ 174,910	$ 172,521	$ 181,321	$ 172,521	$ 167,498
Reclassification adjustment for effect of enacted tax law changes										0
Other comprehensive loss	3,419	(1,677)	(904)	(2,933)	(1,349)	(263)	174	60	(2,095)	(1,378)	(858)
Balance	191,542	$ 184,661	$ 183,304	181,372	181,321	$ 179,882	$ 177,537	174,910	191,542	181,321	172,521
Accumulated Net Unrealized Investment Gain (Loss)
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward]
Balance				$ (2,901)				$ (935)	(2,901)	(935)	1,123
Unrealized gains (losses) during the period									(2,585)	(1,763)	(2,493)
Realized gains during the period									(137)	(471)	(673)
Related deferred taxes									572	782	1,108
Reclassification adjustment for effect of enacted tax law changes									0	(514)	0
Other comprehensive loss									(2,150)	(1,966)	(2,058)
Balance	$ (5,051)				$ (2,901)				$ (5,051)	$ (2,901)	$ (935)

Other Comprehensive Income (L_4

Other Comprehensive Income (Loss), Summary of Transfer of AFS Securities to HTM (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward]
Balance	$ 184,661	$ 183,304	$ 181,372	$ 181,321	$ 179,882	$ 177,537	$ 174,910	$ 172,521	$ 181,321	$ 172,521	$ 167,498
Reclassification adjustment for effect of enacted tax law changes										0
Other comprehensive loss	3,419	(1,677)	(904)	(2,933)	(1,349)	(263)	174	60	(2,095)	(1,378)	(858)
Balance	191,542	$ 184,661	$ 183,304	181,372	181,321	$ 179,882	$ 177,537	174,910	191,542	181,321	172,521
Accumulated Net Gain (Loss) on Securities Transferred from Available-for-Sale to Held-to-Maturity
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward]
Balance				$ (174)				$ (129)	(174)	(129)	(112)
Amortization of unrealized losses									(29)	(22)	(26)
Related deferred taxes									6	8	9
Reclassification adjustment for effect of enacted tax law changes									0	(31)	0
Other comprehensive loss									(23)	(45)	(17)
Balance	$ (197)				$ (174)				$ (197)	$ (174)	$ (129)

Other Comprehensive Income (L_5

Other Comprehensive Income (Loss), Summary of Derivative Financial Instruments (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance	$ 184,661	$ 183,304	$ 181,372	$ 181,321	$ 179,882	$ 177,537	$ 174,910	$ 172,521	$ 181,321	$ 172,521	$ 167,498
Reclassification adjustment for effect of enacted tax law changes										0
Other comprehensive loss	3,419	(1,677)	(904)	(2,933)	(1,349)	(263)	174	60	(2,095)	(1,378)	(858)
Balance	191,542	$ 184,661	$ 183,304	181,372	181,321	$ 179,882	$ 177,537	174,910	191,542	181,321	172,521
Accumulated Net Gain (Loss) from Cash Flow Hedges
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance				$ 1,544				$ 1,163	1,544	1,163	0
Unrealized gains (losses) during the period									(134)	165	1,790
Related deferred taxes									28	(58)	(627)
Reclassification adjustment for effect of enacted tax law changes									0	274	0
Other comprehensive loss									(106)	381	1,163
Balance	$ 1,438				$ 1,544				$ 1,438	$ 1,544	$ 1,163

Other Comprehensive Income (L_6

Other Comprehensive Income (Loss), Summary of Unrealized Gains and Losses on Postretirement Benefits (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward]
Balance	$ 184,661	$ 183,304	$ 181,372	$ 181,321	$ 179,882	$ 177,537	$ 174,910	$ 172,521	$ 181,321	$ 172,521	$ 167,498
Reclassification adjustment for effect of enacted tax law changes										0
Other comprehensive loss	3,419	(1,677)	(904)	(2,933)	(1,349)	(263)	174	60	(2,095)	(1,378)	(858)
Balance	191,542	$ 184,661	$ 183,304	181,372	181,321	$ 179,882	$ 177,537	174,910	191,542	181,321	172,521
Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss)
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward]
Balance				$ (147)				$ (102)	(147)	(102)	(156)
Unrealized gains (losses) during the period									233	(30)	84
Related deferred taxes									(49)	11	(30)
Reclassification adjustment for effect of enacted tax law changes									0	(26)	0
Other comprehensive loss									184	(45)	54
Balance	$ 37				$ (147)				$ 37	$ (147)	$ (102)

Financial Derivative Instrume_3

Financial Derivative Instruments (Details) - Cash Flow Hedging - Designated as Hedging Instrument - USD ($)	Dec. 31, 2018	Dec. 31, 2017
June 28, 2016
Derivative [Line Items]
Notional Amount	$ 30,000,000
Fixed Rate Paid	0.94%
Fair Value	$ 1,110,000	$ 1,154,000
June 27, 2016
Derivative [Line Items]
Notional Amount	$ 20,000,000
Fixed Rate Paid	0.89%
Fair Value	$ 763,000	801,000
June 5, 2018, Maturity Date December 5, 2019
Derivative [Line Items]
Notional Amount	$ 25,000,000
Fixed Rate Paid	2.47%
Fair Value	$ 16,000	0
June 5, 2018, Maturity Date June 5, 2020
Derivative [Line Items]
Notional Amount	$ 25,000,000
Fixed Rate Paid	2.55%
Fair Value	$ (9,000)	0
June 5, 2018, Maturity Date December 5, 2020
Derivative [Line Items]
Notional Amount	$ 25,000,000
Fixed Rate Paid	2.60%
Fair Value	$ (60,000)	0
Interest Rate Swap
Derivative [Line Items]
Notional Amount	125,000,000
Fair Value	$ 1,820,000	$ 1,955,000

Preferred and Common Stock (Det

Preferred and Common Stock (Details) - USD ($)	Jan. 09, 2009	Nov. 30, 2016	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2018	May 31, 2015	Dec. 31, 2001
Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract]
Proceeds from issuance of CPP Shares	$ 25,000,000
Number of shares of common stock issuable pursuant to the Warrants, maximum (in shares)	225,904						226,819
Exercise price of the Warrants (in dollars per share)	$ 16.60						$ 16.53
Term of warrants (in years)	10 years
Repurchase of warrants		$ 1,750,000	$ 0	$ 0	$ 1,750,000
Common stock
Number of shares available to directors and employees for stock purchase or savings and investment plans (in shares)				700,000	250,000
Number of shares issued under employee savings and investment plan (in shares)			39,411			39,411
Number of shares available for future use under employee savings and investment plan (in shares)			210,589			210,589
Number of shares issued during period, employee benefit plan (in shares)			12,138	12,762	14,511
Number of shares registered with SEC for dividend reinvestment plan (in shares)								600,000
Number of shares issued during period, dividend reinvestment plan (in shares)			9,524	9,922	10,889	267,284
Number of shares for future use (in shares)			332,716
Number of trading days immediately preceding dividend payment date used in determining per share price of shares purchased			5 years
Proceeds from sale of common stock			$ 619,000	$ 632,000	$ 531,000
Capital Purchase Program
Common stock
Proceeds from sale of common stock			$ 619,000	$ 632,000	$ 531,000

Stock Options and Stock-Based_3

Stock Options and Stock-Based Compensation - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares of common stock reserved for issuance (in shares)			400,000
Shares	144,355
Compensation cost related to restricted stock grants	$ 1,489
Compensation expense recognized for restricted shares	381	$ 392
Unrecognized compensation costs	$ 678	$ 601
Plan 2010 | Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares	67,689

Stock Options and Stock-Based_4

Stock Options and Stock-Based Compensation - Summary of Restricted Stock Granted (Details) - Plan 2010 - Restricted Stock - shares	9 Months Ended	12 Months Ended
	Sep. 30, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares		67,689
Remaining Term (In Years)		1 year 9 months 18 days
2014 | Five Years
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting Term (In Years)						5 years
Shares						10,422
Remaining Term (In Years)						3 days
2015 | Five Years
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting Term (In Years)					5 years
Shares					12,023
Remaining Term (In Years)					1 year
2016 | Five Years
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting Term (In Years)				5 years
Shares				15,015
Remaining Term (In Years)				2 years
2017 | Three Years
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting Term (In Years)			3 years
Shares			4,902
Remaining Term (In Years)			1 year 1 month 6 days
2017 | Five Years
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting Term (In Years)			5 years
Shares			9,972
Remaining Term (In Years)			3 years
2018 | One Year
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting Term (In Years)	1 year
Shares	300
Remaining Term (In Years)	3 days
2018 | Two Years
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting Term (In Years)	2 years
Shares	932
Remaining Term (In Years)	1 year
2018 | Three Years
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting Term (In Years)		3 years
Shares		2,400
Remaining Term (In Years)		2 years 1 month 6 days
2018 | Four Years
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting Term (In Years)		4 years
Shares		2,068
Remaining Term (In Years)		3 years
2018 | Five Years
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting Term (In Years)		5 years
Shares		9,655
Remaining Term (In Years)		4 years

Earnings Per Share (Details)

Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income (Numerator) [Abstract]
Net income as reported	$ 6,363	$ 5,933	$ 5,734	$ 5,506	$ 5,086	$ 4,982	$ 4,883	$ 4,637	$ 23,536	$ 19,588	$ 18,009
Basic EPS: Income available to common shareholders									23,536	19,588	18,009
Diluted EPS: Income available to common shareholders plus assumed conversions									$ 23,536	$ 19,588	$ 18,009
Shares (Denominator) [Abstract]
Weighted average number of common shares outstanding (in shares)									10,783,419	10,747,306	10,713,290
Incremental shares (in shares)									69,055	71,712	116,512
Diluted EPS: Income available to common shareholders plus assumed conversions (in shares)									10,852,474	10,819,018	10,829,802
Per-Share Amount [Abstract]
Basic EPS: Income available to common shareholders (in dollars per share)	$ 0.59	$ 0.55	$ 0.53	$ 0.51	$ 0.48	$ 0.46	$ 0.45	$ 0.43	$ 2.18	$ 1.82	$ 1.68
Diluted EPS: Income available to common shareholders plus assumed conversions (in dollars per share)	$ 0.58	$ 0.55	$ 0.53	$ 0.51	$ 0.47	$ 0.46	$ 0.45	$ 0.43	$ 2.17	$ 1.81	$ 1.66

Regulatory Capital Requiremen_3

Regulatory Capital Requirements (Details) - USD ($)	Dec. 31, 2018	Dec. 31, 2017	Mar. 31, 2015
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Retained earnings from prior two years available for dividends	$ 21,391,000
Capital conservation buffer phase in, minimum (as a percentage)	2.25%		0.00%
Capital conservation buffer phase in, maximum (as a percentage)			2.50%
Capital conservation buffer (as a percentage)	7.11%
Tier 1 capital to risk-weighted assets [Abstract]
Actual	$ 165,117,000	$ 153,114,000
Actual	165,117,000	153,114,000
For capital adequacy purposes		$ 48,415,000
Risk-weighted assets [Abstract]
Actual (in hundredths)		14.23%
For capital adequacy purposes (in hundredths)		4.50%
Non Consolidated
Tier 2 capital to risk-weighted asets [Abstract]
Actual	175,448,000	$ 162,355,000
For capital adequacy purposes	92,892,000	86,063,000
To be well-capitalized under prompt corrective action provisions	116,115,000	107,579,000
Tier 1 capital to risk-weighted assets [Abstract]
Actual	164,116,000	151,526,000
For capital adequacy purposes	69,669,000	64,548,000
To be well-capitalized under prompt corrective action provisions	92,892,000	86,063,000
Actual	164,116,000	151,526,000
For capital adequacy purposes	52,252,000	48,411,000
To be well-capitalized under prompt corrective action provisions	$ 75,474,000	$ 69,926,000
Risk-weighted assets [Abstract]
Actual (in hundredths)	15.11%	15.09%
For capital adequacy purposes (in hundredths)	8.00%	8.00%
To be well-capitalized under prompt corrective action provisions (in hundredths)	10.00%	10.00%
Actual (in hundredths)	14.13%	14.09%
For capital adequacy purposes (in hundredths)	6.00%	6.00%
To be well-capitalized under prompt corrective action provisions (in hundredths)	8.00%	8.00%
Actual (in hundredths)	14.13%	14.09%
For capital adequacy purposes (in hundredths)	4.50%	4.50%
To be well-capitalized under prompt corrective action provisions (in hundredths)	6.50%	6.50%
Tier 1 capital to average assets [Abstract]
Actual	$ 164,116,000	$ 151,526,000
For capital adequacy purpose	77,269,000	71,386,000
To be well-capitalized under prompt corrective action provisions	$ 96,586,000	$ 89,233,000
Average assets [Abstract]
Actual (in hundredths)	8.51%	8.49%
For capital adequacy purpose (in hundredths)	4.00%	4.00%
To be well-capitalized under prompt corrective action provisions (in hundredths)	5.00%	5.00%
Consolidated
Tier 2 capital to risk-weighted asets [Abstract]
Actual	$ 176,349,000	$ 163,943,000
For capital adequacy purposes	92,892,000	86,070,000
Tier 1 capital to risk-weighted assets [Abstract]
For capital adequacy purposes	69,669,000	$ 64,553,000
For capital adequacy purposes	$ 52,252,000
Risk-weighted assets [Abstract]
Actual (in hundredths)	15.19%	15.24%
For capital adequacy purposes (in hundredths)	8.00%	8.00%
Actual (in hundredths)	14.22%	14.23%
For capital adequacy purposes (in hundredths)	6.00%	6.00%
Actual (in hundredths)	14.22%
For capital adequacy purposes (in hundredths)	4.50%
Tier 1 capital to average assets [Abstract]
Actual	$ 165,117,000	$ 153,114,000
For capital adequacy purpose	$ 76,810,000	$ 71,435,000
Average assets [Abstract]
Actual (in hundredths)	8.60%	8.57%
For capital adequacy purpose (in hundredths)	4.00%	4.00%

Off-Balance-Sheet Financial I_3

Off-Balance-Sheet Financial Instruments and Concentrations of Credit Risk (Details)	12 Months Ended
	Dec. 31, 2018USD ($)derivative	Dec. 31, 2017USD ($)
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Off-balance-sheet financial instruments	$ 166,312,000	$ 151,879,000
Designated as Hedging Instrument | Interest Rate Swap | Cash Flow Hedging
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Number of derivative instruments (derivative) | derivative	5
Notional Amount	$ 125,000,000
Unrealized gain on derivative	1,438,000
Unused lines, collateralized by residential real estate
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Off-balance-sheet financial instruments	83,421,000	76,887,000
Other unused commitments
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Off-balance-sheet financial instruments	60,033,000	62,771,000
Standby letters of credit
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Off-balance-sheet financial instruments	3,590,000	3,497,000
Commitments to extend credit
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Off-balance-sheet financial instruments	$ 19,268,000	$ 8,724,000

Fair Value Disclosures - Assets

Fair Value Disclosures - Assets and Liabilities Recorded on a Recurring and Nonrecurring Basis (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	$ 317,416
Securities available for sale		$ 297,199
Allowance for loan losses, other real estate owned	0	53	$ 205	$ 162
Allowance for impaired loans	2,096	1,531
U.S. Government-sponsored agencies
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	5,007
Mortgage-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	307,693
Securities available for sale		289,989
State and political subdivisions
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	4,716
Securities available for sale		6,769
Other equity securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale		441
Fair Value, Measurements, Recurring | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	0
Securities available for sale		0
Assets measured at fair value	0	0
Fair Value, Measurements, Recurring | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	317,416
Securities available for sale		297,199
Assets measured at fair value	319,236	299,154
Fair Value, Measurements, Recurring | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	0
Securities available for sale		0
Assets measured at fair value	0	0
Fair Value, Measurements, Recurring | Estimate of Fair Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	317,416
Securities available for sale		297,199
Assets measured at fair value	319,236	299,154
Fair Value, Measurements, Recurring | Interest Rate Swap | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest rate swap agreements	0	0
Fair Value, Measurements, Recurring | Interest Rate Swap | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest rate swap agreements	1,820	1,955
Fair Value, Measurements, Recurring | Interest Rate Swap | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest rate swap agreements	0	0
Fair Value, Measurements, Recurring | Interest Rate Swap | Estimate of Fair Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest rate swap agreements	1,820	1,955
Fair Value, Measurements, Recurring | U.S. Government-sponsored agencies | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	0
Fair Value, Measurements, Recurring | U.S. Government-sponsored agencies | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	5,007
Fair Value, Measurements, Recurring | U.S. Government-sponsored agencies | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	0
Fair Value, Measurements, Recurring | U.S. Government-sponsored agencies | Estimate of Fair Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	5,007
Fair Value, Measurements, Recurring | Mortgage-backed securities | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	0
Securities available for sale		0
Fair Value, Measurements, Recurring | Mortgage-backed securities | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	307,693
Securities available for sale		289,989
Fair Value, Measurements, Recurring | Mortgage-backed securities | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	0
Securities available for sale		0
Fair Value, Measurements, Recurring | Mortgage-backed securities | Estimate of Fair Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	307,693
Securities available for sale		289,989
Fair Value, Measurements, Recurring | State and political subdivisions | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	0
Securities available for sale		0
Fair Value, Measurements, Recurring | State and political subdivisions | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	4,716
Securities available for sale		6,769
Fair Value, Measurements, Recurring | State and political subdivisions | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	0
Securities available for sale		0
Fair Value, Measurements, Recurring | State and political subdivisions | Estimate of Fair Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	4,716
Securities available for sale		6,769
Fair Value, Measurements, Recurring | Other equity securities | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale		0
Fair Value, Measurements, Recurring | Other equity securities | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale		441
Fair Value, Measurements, Recurring | Other equity securities | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale		0
Fair Value, Measurements, Recurring | Other equity securities | Estimate of Fair Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale		441
Fair Value, Measurements, Nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other real estate owned	584	1,012
Impaired loans	7,415	6,521
Assets measured at fair value	7,999	7,533
Fair Value, Measurements, Nonrecurring | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other real estate owned	0	0
Impaired loans	0	0
Assets measured at fair value	0	0
Fair Value, Measurements, Nonrecurring | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other real estate owned	584	1,012
Impaired loans	7,415	6,521
Assets measured at fair value	7,999	7,533
Fair Value, Measurements, Nonrecurring | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other real estate owned	0	0
Impaired loans	0	0
Assets measured at fair value	$ 0	$ 0

Fair Value Disclosures - Carryi

Fair Value Disclosures - Carrying Amounts and Estimated Fair Values (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017
Financial assets
Securities to be held to maturity, fair value	$ 250,900				$ 259,655
Loans (net of allowance for loan losses)
Mortgage servicing rights	2,586				2,321
Financial liabilities
Certificates of deposit	591,409				559,001
Total deposits	1,527,085	$ 1,514,911	$ 1,416,646	$ 1,428,192	1,418,879	$ 1,350,049	$ 1,319,259	$ 1,346,483
Level 1
Financial assets
Securities to be held to maturity, fair value	0				0
Loans (net of allowance for loan losses)
Loans	0				0
Mortgage servicing rights	0				0
Financial liabilities
Certificates of deposit	0				0
National certificates of deposit	0				0
Total deposits	0				0
Repurchase agreements	0				0
Federal Home Loan Bank advances	0				0
Total borrowed funds	0				0
Level 1 | Commercial | Real Estate
Loans (net of allowance for loan losses)
Loans	0				0
Level 1 | Commercial | Construction
Loans (net of allowance for loan losses)
Loans	0				0
Level 1 | Commercial | Other
Loans (net of allowance for loan losses)
Loans	0				0
Level 1 | Municipal
Loans (net of allowance for loan losses)
Loans	0				0
Level 1 | Residential | Construction
Loans (net of allowance for loan losses)
Loans	0				0
Level 1 | Residential | Term
Loans (net of allowance for loan losses)
Loans	0				0
Level 1 | Home Equity LIne of Credit
Loans (net of allowance for loan losses)
Loans	0				0
Level 1 | Consumer
Loans (net of allowance for loan losses)
Loans	0				0
Level 2
Financial assets
Securities to be held to maturity, fair value	250,900				259,655
Loans (net of allowance for loan losses)
Loans	7,415				6,521
Mortgage servicing rights	2,586				2,321
Financial liabilities
Certificates of deposit	281,282				220,734
National certificates of deposit	307,508				335,775
Total deposits	588,790				556,509
Repurchase agreements	40,161				67,976
Federal Home Loan Bank advances	169,240				156,396
Total borrowed funds	209,401				224,372
Level 2 | Commercial | Real Estate
Loans (net of allowance for loan losses)
Loans	423				72
Level 2 | Commercial | Construction
Loans (net of allowance for loan losses)
Loans	0				0
Level 2 | Commercial | Other
Loans (net of allowance for loan losses)
Loans	6,096				6,018
Level 2 | Municipal
Loans (net of allowance for loan losses)
Loans	0				0
Level 2 | Residential | Construction
Loans (net of allowance for loan losses)
Loans	0				0
Level 2 | Residential | Term
Loans (net of allowance for loan losses)
Loans	793				391
Level 2 | Home Equity LIne of Credit
Loans (net of allowance for loan losses)
Loans	103				40
Level 2 | Consumer
Loans (net of allowance for loan losses)
Loans	0				0
Level 3
Financial assets
Securities to be held to maturity, fair value	0				0
Loans (net of allowance for loan losses)
Loans	1,186,373				1,132,206
Mortgage servicing rights	0				0
Financial liabilities
Certificates of deposit	0				0
National certificates of deposit	0				0
Total deposits	0				0
Repurchase agreements	0				0
Federal Home Loan Bank advances	0				0
Total borrowed funds	0				0
Level 3 | Commercial | Real Estate
Loans (net of allowance for loan losses)
Loans	340,103				311,249
Level 3 | Commercial | Construction
Loans (net of allowance for loan losses)
Loans	26,344				36,610
Level 3 | Commercial | Other
Loans (net of allowance for loan losses)
Loans	183,746				169,437
Level 3 | Municipal
Loans (net of allowance for loan losses)
Loans	50,965				33,280
Level 3 | Residential | Construction
Loans (net of allowance for loan losses)
Loans	17,083				17,613
Level 3 | Residential | Term
Loans (net of allowance for loan losses)
Loans	450,530				430,637
Level 3 | Home Equity LIne of Credit
Loans (net of allowance for loan losses)
Loans	95,072				108,972
Level 3 | Consumer
Loans (net of allowance for loan losses)
Loans	22,530				24,408
Carrying Amount
Financial assets
Securities to be held to maturity, fair value	255,663				256,567
Loans (net of allowance for loan losses)
Loans	1,227,051				1,153,410
Mortgage servicing rights	1,354				1,268
Financial liabilities
Certificates of deposit	284,482				223,074
National certificates of deposit	306,927				335,927
Total deposits	591,409				559,001
Repurchase agreements	40,205				70,564
Federal Home Loan Bank advances	170,112				158,194
Total borrowed funds	210,317				228,758
Carrying Amount | Commercial | Real Estate
Loans (net of allowance for loan losses)
Loans	349,243				319,691
Carrying Amount | Commercial | Construction
Loans (net of allowance for loan losses)
Loans	27,018				37,594
Carrying Amount | Commercial | Other
Loans (net of allowance for loan losses)
Loans	192,420				177,956
Carrying Amount | Municipal
Loans (net of allowance for loan losses)
Loans	51,101				33,370
Carrying Amount | Residential | Construction
Loans (net of allowance for loan losses)
Loans	17,705				17,830
Carrying Amount | Residential | Term
Loans (net of allowance for loan losses)
Loans	467,760				431,459
Carrying Amount | Home Equity LIne of Credit
Loans (net of allowance for loan losses)
Loans	97,650				110,566
Carrying Amount | Consumer
Loans (net of allowance for loan losses)
Loans	24,154				24,944
Estimate of Fair Value
Financial assets
Securities to be held to maturity, fair value	250,900				259,655
Loans (net of allowance for loan losses)
Loans	1,193,788				1,138,727
Mortgage servicing rights	2,586				2,321
Financial liabilities
Certificates of deposit	281,282				220,734
National certificates of deposit	307,508				335,775
Total deposits	588,790				556,509
Repurchase agreements	40,161				67,976
Federal Home Loan Bank advances	169,240				156,396
Total borrowed funds	209,401				224,372
Estimate of Fair Value | Commercial | Real Estate
Loans (net of allowance for loan losses)
Loans	340,526				311,321
Estimate of Fair Value | Commercial | Construction
Loans (net of allowance for loan losses)
Loans	26,344				36,610
Estimate of Fair Value | Commercial | Other
Loans (net of allowance for loan losses)
Loans	189,842				175,455
Estimate of Fair Value | Municipal
Loans (net of allowance for loan losses)
Loans	50,965				33,280
Estimate of Fair Value | Residential | Construction
Loans (net of allowance for loan losses)
Loans	17,083				17,613
Estimate of Fair Value | Residential | Term
Loans (net of allowance for loan losses)
Loans	451,323				431,028
Estimate of Fair Value | Home Equity LIne of Credit
Loans (net of allowance for loan losses)
Loans	95,175				109,012
Estimate of Fair Value | Consumer
Loans (net of allowance for loan losses)
Loans	$ 22,530				$ 24,408

Other Operating Income and Ex_3

Other Operating Income and Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Other operating expense
Advertising and marketing expense	$ 1,165	$ 1,208	$ 1,099
Accounting and auditing expenses	837	818	690
ATM and interchange expense	995	886	853
ATM and debit card income
Other operating income
ATM and debit card income	$ 3,556	$ 3,378	$ 3,024

Condensed Financial Informati_3

Condensed Financial Information of Parent (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended								12 Months Ended
	Nov. 30, 2016	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Assets
Cash and cash equivalents		$ 19,134	$ 21,649	$ 21,056	$ 16,559	$ 19,207	$ 22,375	$ 23,718	$ 17,600	$ 19,134	$ 19,207
Investments		573,079	562,839	565,125	562,459	553,766	541,678	552,269	553,453	573,079	553,766
Premises and equipment		22,056				22,502				22,056	22,502
Goodwill		29,805				29,805				29,805	29,805
Other assets		42,536				45,757				42,536	45,757
Total assets		1,944,570	1,981,854	1,913,961	1,871,815	1,842,930	1,781,701	1,795,651	1,763,828	1,944,570	1,842,930
Liabilities and shareholders' equity
Other liabilities		15,626	17,008	16,556	18,022	13,972	17,442	16,578	15,968	15,626	13,972
Total liabilities		1,753,028				1,661,609				1,753,028	1,661,609
Shareholders' equity
Common stock		109				108				109	108
Additional paid-in capital		62,746				61,747				62,746	61,747
Retained earnings		132,460				121,144				132,460	121,144
Accumulated other comprehensive income (loss)
Net unrealized gain on available for sale securities, net of tax		(5,051)				(2,901)				(5,051)	(2,901)
Total shareholders' equity		191,542	184,661	183,304	181,372	181,321	179,882	177,537	174,910	191,542	181,321	$ 172,521	$ 167,498
Total liabilities and shareholders' equity		1,944,570	1,981,854	1,913,961	1,871,815	1,842,930	1,781,701	1,795,651	1,763,828	1,944,570	1,842,930
Statements of Income
Net securities gains										137	471	673
Income before income taxes		7,585	7,021	6,774	6,462	6,868	6,684	6,527	6,121	27,842	26,200	24,463
Applicable tax expense		1,222	1,088	1,040	956	1,782	1,702	1,644	1,484	4,306	6,612	6,454
Equity in earnings of Bank
Net income		6,363	5,933	5,734	5,506	5,086	4,982	4,883	4,637	23,536	19,588	18,009
Cash flows from operating activities
Net income		6,363	$ 5,933	$ 5,734	5,506	5,086	$ 4,982	$ 4,883	4,637	23,536	19,588	18,009
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation										1,792	1,864	1,745
Equity compensation expense										381	392	298
(Gain) loss on sale of investments										(137)	(471)	(673)
Tax benefit from vesting of restricted stock										0	0	32
Decrease in other assets										1,146	(4,817)	(2,444)
Increase (decrease) in other liabilities										3,848	(2,020)	665
Net cash provided by operating activities										33,840	22,273	21,190
Cash flows from investing activities
Proceeds from maturities, payments, calls of securities available for sale										51,752	156,969	79,217
Capital expenditures										(1,484)	(2,529)	(2,131)
Net cash used in investing activities										(112,077)	(130,060)	(148,177)
Cash flows from financing activities
Purchase of common stock										(168)	(154)	(129)
Proceeds from sale of common stock										619	632	531
Repurchase of warrants	$ (1,750)									0	0	(1,750)
Dividends paid										(12,052)	(11,460)	(9,810)
Net cash provided by financing activities										78,164	109,628	130,054
Net increase (decrease) in cash and cash equivalents										(73)	1,841	3,067
Cash and cash equivalents at beginning of year					19,207				17,366	19,207	17,366	14,299
Cash and cash equivalents at end of year		19,134				19,207				19,134	19,207	17,366
Parent Company
Assets
Cash and cash equivalents		1,190				958				1,190	958
Dividends receivable		2,950				2,500				2,950	2,500
Investments		0				441				0	441
Investment in subsidiary		162,763				152,174				162,763	152,174
Premises and equipment		2				3				2	3
Goodwill		27,559				27,559				27,559	27,559
Other assets		232				312				232	312
Total assets		194,696				183,947				194,696	183,947
Liabilities and shareholders' equity
Dividends payable		3,150				2,599				3,150	2,599
Other liabilities		4				27				4	27
Total liabilities		3,154				2,626				3,154	2,626
Shareholders' equity
Common stock		109				108				109	108
Additional paid-in capital		62,746				61,747				62,746	61,747
Retained earnings		128,687				119,373				128,687	119,373
Accumulated other comprehensive income (loss)
Net unrealized gain on available for sale securities, net of tax		0				93				0	93
Total accumulated other comprehensive income		0				93				0	93
Total shareholders' equity		191,542				181,321				191,542	181,321
Total liabilities and shareholders' equity		194,696				183,947				194,696	183,947
Statements of Income
Interest and dividends on investments										0	15	22
Net securities gains										137	(3)	(6)
Total income										137	12	16
Occupancy expense										2	5	9
Other operating expense										652	588	528
Total expense										654	593	537
Income before income taxes										(517)	(581)	(521)
Applicable tax expense										(164)	(187)	(186)
Loss before Bank earnings										(353)	(394)	(335)
Equity in earnings of Bank
Remitted										11,300	11,180	11,300
Unremitted										12,589	8,802	7,044
Net income										23,536	19,588	18,009
Cash flows from operating activities
Net income										23,536	19,588	18,009
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation										0	5	8
Equity compensation expense										381	392	298
(Gain) loss on sale of investments										(137)	3	6
Tax benefit from vesting of restricted stock										0	0	32
Decrease in other assets										81	27	136
(Increase) decrease in dividends receivable										(450)	1,300	(1,300)
Increase (decrease) in dividends payable										551	(1,179)	112
Increase (decrease) in other liabilities										0	(3)	(4)
Unremitted earnings of Bank										(12,589)	(8,802)	(7,044)
Net cash provided by operating activities										11,373	11,331	10,253
Cash flows from investing activities
Proceeds from maturities, payments, calls of securities available for sale										459	0	87
Capital expenditures										1	(4)	0
Net cash used in investing activities										460	(4)	87
Cash flows from financing activities
Purchase of common stock										(168)	(154)	(129)
Proceeds from sale of common stock										619	632	531
Repurchase of warrants										0	0	(1,750)
Dividends paid										(12,052)	(11,460)	(9,810)
Net cash provided by financing activities										(11,601)	(10,982)	(11,158)
Net increase (decrease) in cash and cash equivalents										232	345	(818)
Cash and cash equivalents at beginning of year					$ 958				$ 613	958	613	1,431
Cash and cash equivalents at end of year		$ 1,190				$ 958				$ 1,190	$ 958	$ 613

New Accounting Pronouncements (

New Accounting Pronouncements (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2017USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reclassification adjustment for effect of enacted tax law changes	$ 0
Retained earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reclassification adjustment for effect of enacted tax law changes	$ 297

Quarterly Information (Details)

Quarterly Information (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Balance Sheets
Cash and cash equivalents	$ 19,134	$ 21,649	$ 21,056	$ 16,559	$ 19,207	$ 22,375	$ 23,718	$ 17,600	$ 19,134	$ 19,207
Interest-bearing deposits in other banks	12,079	51,045	1,616	280	860	584	291	3,272	12,079	860
Investments	573,079	562,839	565,125	562,459	553,766	541,678	552,269	553,453	573,079	553,766
Restricted equity securities	11,586	11,586	12,363	11,947	10,358	10,798	12,311	13,363	11,586	10,358
Net loans and loans held for sale	1,227,051	1,233,010	1,213,449	1,177,329	1,153,796	1,110,508	1,110,919	1,080,347	1,227,051	1,153,796
Other assets	101,641	101,725	100,352	103,241	104,943	95,758	96,143	95,793	101,641	104,943
Total assets	1,944,570	1,981,854	1,913,961	1,871,815	1,842,930	1,781,701	1,795,651	1,763,828	1,944,570	1,842,930
Deposits	1,527,085	1,514,911	1,416,646	1,428,192	1,418,879	1,350,049	1,319,259	1,346,483	1,527,085	1,418,879
Borrowed funds	210,317	265,274	297,455	244,229	228,758	234,328	282,277	226,467	210,317	228,758
Other liabilities	15,626	17,008	16,556	18,022	13,972	17,442	16,578	15,968	15,626	13,972
Shareholders' equity	191,542	184,661	183,304	181,372	181,321	179,882	177,537	174,910	191,542	181,321	$ 172,521	$ 167,498
Total liabilities and shareholders' equity	1,944,570	1,981,854	1,913,961	1,871,815	1,842,930	1,781,701	1,795,651	1,763,828	1,944,570	1,842,930
Statements of Income
Interest income	18,801	18,086	17,205	16,451	15,822	15,517	15,002	14,491	70,543	60,832	53,759
Interest expense	5,806	5,550	4,936	4,042	3,614	3,563	3,337	3,015	20,334	13,529	10,812
Net interest income	12,995	12,536	12,269	12,409	12,208	11,954	11,665	11,476	50,209	47,303	42,947
Provision for loan losses	167	333	500	500	250	750	500	500	1,500	2,000	1,600
Net interest income after provision for loan losses	12,828	12,203	11,769	11,909	11,958	11,204	11,165	10,976	48,709	45,303	41,347
Non-interest income	3,253	3,034	3,181	3,132	3,210	3,493	3,002	2,843	12,600	12,548	12,499
Non-interest expense	8,496	8,216	8,176	8,579	8,300	8,013	7,640	7,698	33,467	31,651	29,383
Income before income taxes	7,585	7,021	6,774	6,462	6,868	6,684	6,527	6,121	27,842	26,200	24,463
Applicable tax expense	1,222	1,088	1,040	956	1,782	1,702	1,644	1,484	4,306	6,612	6,454
Net income	$ 6,363	$ 5,933	$ 5,734	$ 5,506	$ 5,086	$ 4,982	$ 4,883	$ 4,637	$ 23,536	$ 19,588	$ 18,009
Basic earnings per common share (in usd per share)	$ 0.59	$ 0.55	$ 0.53	$ 0.51	$ 0.48	$ 0.46	$ 0.45	$ 0.43	$ 2.18	$ 1.82	$ 1.68
Diluted earnings per common share (in usd per share)	$ 0.58	$ 0.55	$ 0.53	$ 0.51	$ 0.47	$ 0.46	$ 0.45	$ 0.43	$ 2.17	$ 1.81	$ 1.66
Other comprehensive income (loss), net of tax
Net unrealized gain (loss) on securities available for sale	$ 4,082	$ (1,888)	$ (1,035)	$ (3,309)	$ (1,562)	$ (240)	$ 349	$ 1	$ (2,150)	$ (1,452)	$ (2,058)
Net unrealized loss on securities transferred from available for sale to held to maturity, net of tax	(3)	(5)	(7)	(8)	(3)	(3)	(4)	(4)	(23)	(14)	(17)
Net unrealized gain (loss) on cash flow hedging derivative instruments	(844)	216	138	384	235	(20)	(171)	63	(106)	107	1,163
Unrecognized gain (loss) on postretirement benefit costs	184	0	0	0	(19)	0	0	0	184	(19)	54
Other comprehensive loss	3,419	(1,677)	(904)	(2,933)	(1,349)	(263)	174	60	(2,095)	(1,378)	(858)
Comprehensive income	$ 9,782	$ 4,256	$ 4,830	$ 2,573	$ 3,737	$ 4,719	$ 5,057	$ 4,697	$ 21,441	$ 18,210	$ 17,151