The First Bancorp, Inc. (FNLC) 10-K 6 Mar 20 2019 FY Annual report Financial data

Cover

Cover - USD ($)	12 Months Ended
	Dec. 31, 2019	Mar. 01, 2020	Jun. 30, 2019
Cover page.
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2019
Entity File Number	0-26589
Entity Registrant Name	FIRST BANCORP, INC
Entity Incorporation, State or Country Code	ME
Entity Tax Identification Number	01-0404322
Entity Address, Address Line One	223 Main Street
Entity Address, City or Town	Damariscotta
Entity Address, State or Province	ME
Entity Address, Postal Zip Code	04543
Entity Central Index Key	0000765207
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Accelerated Filer
Entity Public Float			$ 273,082,000
Entity Common Stock, Shares Outstanding		10,920,770
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	FY
Amendment Flag	false
Entity Emerging Growth Company	false
Entity Small Business	true
Entity Shell Company	false
City Area Code	207
Local Phone Number	563-3195
Document Transition Report	false

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Assets
Cash and cash equivalents	$ 14,433	$ 19,134
Interest-bearing deposits in other banks	11,310	12,079
Securities available for sale	360,520	317,416
Securities to be held to maturity (fair value of $287,045,000 at December 31, 2019, and $250,900,000 at December 31, 2018)	281,606	255,663
Restricted equity securities, at cost	8,982	11,586
Loans held for sale	154	0
Loans	1,297,075	1,238,283
Less allowance for loan losses	11,639	11,232
Net loans	1,285,436	1,227,051
Accrued interest receivable	7,167	6,660
Premises and equipment, net	21,305	22,056
Other real estate owned	279	584
Goodwill	29,805	29,805
Other assets	47,799	42,536
Total assets	2,068,796	1,944,570
Liabilities
Demand deposits	169,777	163,575
NOW deposits	393,569	382,923
Money market deposits	161,000	152,043
Savings deposits	236,141	237,135
Certificates of deposit	689,979	591,409
Total deposits	1,650,466	1,527,085
Borrowed funds – short term	174,850	145,205
Borrowed funds – long term	10,105	65,112
Other liabilities	20,867	15,626
Total liabilities	1,856,288	1,753,028
Commitments and contingent liabilities
Shareholders' equity
Common stock, one cent par value per share	109	109
Additional paid-in capital	63,964	62,746
Retained earnings	144,839	132,460
Accumulated other comprehensive income (loss)
Net unrealized gain (loss) on securities available for sale	3,657	(5,051)
Net unrealized loss on securities transferred from available for sale to held to maturity	(182)	(197)
Net unrealized gain on cash flow hedging derivative instruments	97	1,438
Net unrecognized gain on postretirement benefit costs	24	37
Total shareholders' equity	212,508	191,542
Total liabilities and shareholders' equity	$ 2,068,796	$ 1,944,570
Common stock
Number of shares authorized (in shares)	18,000,000	18,000,000
Number of shares issued (in shares)	10,899,210	10,862,651
Number of shares outstanding (in shares)	10,899,210	10,862,651
Book value per common share (usd per share)	$ 19.50	$ 17.63
Tangible book value per common share (usd per share)	$ 16.75	$ 14.87

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Assets
Securities to be held to maturity, fair value	$ 287,045	$ 250,900
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, 2019	Dec. 31, 2018	Dec. 31, 2017
Interest and dividend income
Interest and fees on loans (includes tax-exempt income of $1,302,000 in 2019, $1,157,000 in 2018, and $798,000 in 2017)	$ 59,239	$ 53,548	$ 45,373
Interest on deposits with other banks	188	242	52
Interest and dividends on investments (includes tax-exempt income of $7,333,000 in 2019, $6,954,000 in 2018, and $6,501,000 in 2017)	19,224	16,753	15,407
Total interest and dividend income	78,651	70,543	60,832
Interest expense
Interest on deposits	23,268	15,970	9,479
Interest on borrowed funds	2,890	4,364	4,050
Total interest expense	26,158	20,334	13,529
Net interest income	52,493	50,209	47,303
Provision for loan losses	1,250	1,500	2,000
Net interest income after provision for loan losses	51,243	48,709	45,303
Non-interest income
Net securities gains	224	137	471
Other operating income	6,408	5,674	5,463
Total non-interest income	14,189	12,600	12,548
Non-interest expense
Salaries and employee benefits	18,396	17,641	16,601
Occupancy expense	2,558	2,435	2,400
Furniture and equipment expense	3,990	3,924	3,681
FDIC insurance premiums	439	1,226	1,008
Amortization of identified intangibles	43	43	43
Other operating expense	9,746	8,198	7,918
Total non-interest expense	35,172	33,467	31,651
Income before income taxes	30,260	27,842	26,200
Applicable tax expense	4,735	4,306	6,612
Net income	$ 25,525	$ 23,536	$ 19,588
Basic earnings per common share (in usd per share)	$ 2.36	$ 2.18	$ 1.82
Diluted earnings per common share (in usd per share)	$ 2.34	$ 2.17	$ 1.81
Other comprehensive income (loss), net of tax
Net unrealized gain (loss) on securities available for sale	$ 8,708	$ (2,150)	$ (1,452)
Net unrealized gain (loss) on securities transferred from available for sale to held to maturity, net of amortization	15	(23)	(14)
Net unrealized gain (loss) on cash flow hedging derivative instruments	(1,341)	(106)	107
Net unrecognized gain (loss) on postretirement benefits	(13)	184	(19)
Other comprehensive gain (loss)	7,369	(2,095)	(1,378)
Comprehensive income	32,894	21,441	18,210
Fiduciary and investment management income
Non-interest income
Non-interest income	3,318	3,030	2,680
Service charges on deposit accounts
Non-interest income
Non-interest income	2,330	2,194	2,081
Mortgage origination and servicing income
Non-interest income
Non-interest income	$ 1,909	$ 1,565	$ 1,853

Consolidated Statements of In_2

Consolidated Statements of Income and Comprehensive Income (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Statement [Abstract]
Interest and fees on loans (tax-exempt income)	$ 1,302	$ 1,157	$ 798
Interest and dividends on investments (tax-exempt income)	$ 7,333	$ 6,954	$ 6,501

Consolidated Statements of Chan

Consolidated Statements of Changes in Shareholders' Equity - USD ($)	Total	Common stock and additional paid-in capital	Retained earnings	Accumulated other comprehensive income (loss)
Balance at Dec. 31, 2016	$ 172,521,000	$ 60,831,000	$ 111,693,000	$ (3,000)
Balance (in shares) at Dec. 31, 2016		10,793,946
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	19,588,000		19,588,000
Net unrealized loss on securities available for sale, net of tax	(1,452,000)			(1,452,000)
Net unrealized gain on cash flow hedging derivative instruments, net of tax	107,000			107,000
Net unrealized loss on securities transferred from available for sale to held to maturity, net of tax	(14,000)			(14,000)
Unrecognized gain (loss) for post-retirement benefits, net of tax	(19,000)			(19,000)
Comprehensive income	18,210,000		19,588,000	(1,378,000)
Cash dividends declared	(10,280,000)		(10,280,000)
Equity compensation expense	392,000	$ 392,000
Payment for repurchase of common stock	(154,000)		(154,000)
Payment for repurchase of common stock (in shares)		(5,562)
Reclassification adjustment for effect of enacted tax law changes	0		297,000	(297,000)
Issuance of restricted stock	0
Issuance of restricted stock (in shares)		18,850
Proceeds from sale of common stock	632,000	$ 632,000
Proceeds from sale of common stock (in shares)		22,684
Balance at Dec. 31, 2017	181,321,000	$ 61,855,000	121,144,000	(1,678,000)
Balance (in shares) at Dec. 31, 2017		10,829,918
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	5,506,000
Net unrealized loss on securities available for sale, net of tax	(3,309,000)
Net unrealized loss on securities transferred from available for sale to held to maturity, net of tax	(8,000)
Balance at Mar. 31, 2018	181,372,000
Balance at Dec. 31, 2017	181,321,000	$ 61,855,000	121,144,000	(1,678,000)
Balance (in shares) at Dec. 31, 2017		10,829,918
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	23,536,000		23,536,000
Net unrealized loss on securities available for sale, net of tax	(2,150,000)			(2,150,000)
Net unrealized gain on cash flow hedging derivative instruments, net of tax	(106,000)			(106,000)
Net unrealized loss on securities transferred from available for sale to held to maturity, net of tax	(23,000)			(23,000)
Unrecognized gain (loss) for post-retirement benefits, net of tax	184,000			184,000
Comprehensive income	21,441,000		23,536,000	(2,095,000)
Cash dividends declared	(12,052,000)		(12,052,000)
Equity compensation expense	381,000	$ 381,000
Payment for repurchase of common stock	(168,000)		(168,000)
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	619,000	$ 619,000
Proceeds from sale of common stock (in shares)		21,663
Balance at Dec. 31, 2018	$ 191,542,000	$ 62,855,000	132,460,000	(3,773,000)
Balance (in shares) at Dec. 31, 2018	10,862,651	10,862,651
Balance at Mar. 31, 2018	$ 181,372,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	5,734,000
Net unrealized loss on securities available for sale, net of tax	(1,035,000)
Net unrealized loss on securities transferred from available for sale to held to maturity, net of tax	(7,000)
Balance at Jun. 30, 2018	183,304,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	5,933,000
Net unrealized loss on securities available for sale, net of tax	(1,888,000)
Net unrealized loss on securities transferred from available for sale to held to maturity, net of tax	(5,000)
Balance at Sep. 30, 2018	184,661,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	6,363,000
Net unrealized loss on securities available for sale, net of tax	4,082,000
Net unrealized loss on securities transferred from available for sale to held to maturity, net of tax	(3,000)
Balance at Dec. 31, 2018	$ 191,542,000	$ 62,855,000	132,460,000	(3,773,000)
Balance (in shares) at Dec. 31, 2018	10,862,651	10,862,651
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	$ 6,156,000
Net unrealized loss on securities available for sale, net of tax	3,512,000
Net unrealized loss on securities transferred from available for sale to held to maturity, net of tax	3,000
Balance at Mar. 31, 2019	197,787,000
Balance at Dec. 31, 2018	$ 191,542,000	$ 62,855,000	132,460,000	(3,773,000)
Balance (in shares) at Dec. 31, 2018	10,862,651	10,862,651
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	$ 25,525,000		25,525,000
Net unrealized loss on securities available for sale, net of tax	8,708,000			8,708,000
Net unrealized gain on cash flow hedging derivative instruments, net of tax	(1,341,000)			(1,341,000)
Net unrealized loss on securities transferred from available for sale to held to maturity, net of tax	15,000			15,000
Unrecognized gain (loss) for post-retirement benefits, net of tax	(13,000)			(13,000)
Comprehensive income	32,894,000		25,525,000	7,369,000
Cash dividends declared	(12,963,000)		(12,963,000)
Equity compensation expense	565,000	$ 565,000
Payment for repurchase of common stock	(183,000)		(183,000)
Payment for repurchase of common stock (in shares)		(7,178)
Issuance of restricted stock	0
Issuance of restricted stock (in shares)		19,087
Proceeds from sale of common stock	653,000	$ 653,000
Proceeds from sale of common stock (in shares)		24,650
Balance at Dec. 31, 2019	$ 212,508,000	$ 64,073,000	144,839,000	3,596,000
Balance (in shares) at Dec. 31, 2019	10,899,210	10,899,210
Balance at Mar. 31, 2019	$ 197,787,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	6,395,000
Net unrealized loss on securities available for sale, net of tax	4,289,000
Net unrealized loss on securities transferred from available for sale to held to maturity, net of tax	4,000
Balance at Jun. 30, 2019	204,593,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	6,288,000
Net unrealized loss on securities available for sale, net of tax	936,000
Net unrealized loss on securities transferred from available for sale to held to maturity, net of tax	1,000
Balance at Sep. 30, 2019	208,489,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	6,686,000
Net unrealized loss on securities available for sale, net of tax	(29,000)
Net unrealized loss on securities transferred from available for sale to held to maturity, net of tax	7,000
Balance at Dec. 31, 2019	$ 212,508,000	$ 64,073,000	$ 144,839,000	$ 3,596,000
Balance (in shares) at Dec. 31, 2019	10,899,210	10,899,210

Consolidated Statements of Ch_2

Consolidated Statements of Changes in Shareholders' Equity (Parenthetical) - $ / shares	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Statement of Stockholders' Equity [Abstract]
Cash dividends declared, per share (USD per share)	$ 1.19	$ 1.11	$ 0.95

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Statement of Cash Flows [Abstract]
Net income	$ 25,525	$ 23,536	$ 19,588
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	1,938	1,792	1,864
Change in deferred taxes	336	(485)	2,083
Provision for loan losses	1,250	1,500	2,000
Loans originated for resale	(37,721)	(25,447)	(39,039)
Proceeds from sales and transfers of loans	38,218	26,323	40,172
Net gain on sales of loans	(651)	(490)	(737)
Net gain on sale or call of securities	(224)	(137)	(471)
Net amortization of investment premiums	1,082	1,820	3,212
Net gain on sale of other real estate owned	(113)	(312)	(84)
Provision for losses on other real estate owned	0	0	17
Equity compensation expense	565	381	392
Net (increase) decrease in other assets and accrued interest	(7,690)	1,146	(4,817)
Net increase (decrease) in other liabilities	2,802	3,848	(2,020)
Net (gain) loss on disposal of premises and equipment	386	136	(108)
Amortization of investments in limited partnerships	307	186	178
Net acquisition amortization	43	43	43
Net cash provided by operating activities	26,053	33,840	22,273
Cash flows from investing activities
(Increase) decrease in interest-bearing deposits in other banks	769	(11,219)	(567)
Proceeds from sales of securities available for sale	8,339	459	15,587
Proceeds from maturities, payments, calls of securities available for sale	78,825	51,752	156,969
Proceeds from maturities, payments, calls and sales of securities held to maturity	24,087	14,094	14,770
Proceeds from sales of other real estate owned	418	1,350	607
Purchases of securities available for sale	(98,257)	(76,893)	(177,409)
Purchases of securities to be held to maturity	(71,857)	(13,159)	(44,334)
Purchase of Federal Home Loan Bank Stock	0	(1,228)	0
Redemption of restricted equity securities	2,604	0	1,572
Net increase in loans	(59,635)	(75,751)	(95,199)
Capital expenditures	(1,573)	(1,484)	(2,529)
Proceeds from sale of premises and equipment	0	2	473
Net cash used in investing activities	(116,280)	(112,077)	(130,060)
Cash flows from financing activities
Net increase in demand, savings, and money market accounts	24,811	75,798	88,372
Net increase in certificates of deposit	98,570	32,408	82,381
Advances on long-term borrowings	0	0	50,000
Repayment on long-term borrowings	(25,362)	(80,000)	(70,000)
Net increase (decrease) in short-term borrowings	0	61,559	(30,143)
Payment to repurchase common stock	(183)	(168)	(154)
Proceeds from sale of common stock	653	619	632
Dividends paid	(12,963)	(12,052)	(11,460)
Net cash provided by financing activities	85,526	78,164	109,628
Net increase (decrease) in cash and cash equivalents	(4,701)	(73)	1,841
Cash and cash equivalents at beginning of year	19,134	19,207	17,366
Cash and cash equivalents at end of year	14,433	19,134	19,207
Interest paid	26,088	20,104	13,366
Income taxes paid	3,994	3,057	5,730
Non-cash transactions:
Net transfer from loans to other real estate owned	$ 0	$ 610	$ 1,177

Summary of Significant Accounti

Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2019
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, 2019 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 Bank recognizes all derivatives in the consolidated balance sheets at fair value. On the date the Bank enters into the derivative contract, the Bank 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 Bank 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 Bank 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 troubled debt 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 2019 , 2018 and 2017 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, 2019 , 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 gains and losses on securities transferred from available for sale to held to maturity, net of amortization, change in unrealized gain and losses 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 reportable operating segment.

Cash and Cash Equivalents

Cash and Cash Equivalents	12 Months Ended
	Dec. 31, 2019
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, 2019 , the Company had a contractual clearing balance of $500,000 and a reserve balance requirement of $3,147,000 at the Federal Reserve Bank, which are satisfied by both cash on hand at branches and balances held at the Federal Reserve Bank of Boston. The Company maintains a portion of its cash in bank deposit accounts which, at times, may exceed federally insured limits. The Company has not experienced any losses in such accounts. The Company believes it is not exposed to any significant risk with respect to these accounts.

Investment Securities

Investment Securities	12 Months Ended
	Dec. 31, 2019
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, 2019 and 2018 : Amortized Unrealized Unrealized Fair Value As of December 31, 2019 Cost Gains Losses (Estimated) Securities available for sale U.S. government-sponsored agencies $ 7,500,000 $ — $ (102,000 ) $ 7,398,000 Mortgage-backed securities 323,277,000 4,173,000 (833,000) 326,617,000 State and political subdivisions 25,113,000 1,392,000 — 26,505,000 $ 355,890,000 $ 5,565,000 $ (935,000 ) $ 360,520,000 Securities to be held to maturity U.S. Government-sponsored agencies $ 32,840,000 $ 47,000 $ (26,000 ) $ 32,861,000 Mortgage-backed securities 14,431,000 450,000 (16,000 ) 14,865,000 State and political subdivisions 219,585,000 4,936,000 (109,000 ) 224,412,000 Corporate securities 14,750,000 157,000 — 14,907,000 $ 281,606,000 $ 5,590,000 $ (151,000 ) $ 287,045,000 Restricted equity securities Federal Home Loan Bank Stock $ 7,945,000 $ — $ — $ 7,945,000 Federal Reserve Bank Stock 1,037,000 — — 1,037,000 $ 8,982,000 $ — $ — $ 8,982,000 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 The following table summarizes the contractual maturities of investment securities at December 31, 2019 : 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 $ 127,000 $ 127,000 $ 1,334,000 $ 1,338,000 Due in 1 to 5 years 36,534,000 36,778,000 25,860,000 26,323,000 Due in 5 to 10 years 93,134,000 95,014,000 179,133,000 182,834,000 Due after 10 years 226,095,000 228,601,000 75,279,000 76,550,000 $ 355,890,000 $ 360,520,000 $ 281,606,000 $ 287,045,000 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 At December 31, 2019 , securities with a fair value of $214,173,000 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 $222,829,000 as of December 31, 2018 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 2019 , 2018 and 2017 : 2019 2018 2017 Proceeds from sales of securities $ 9,229,000 $ 459,000 $ 15,587,000 Gross realized gains 224,000 137,000 471,000 Gross realized losses — — — Net gain $ 224,000 $ 137,000 $ 471,000 Related income taxes $ 47,000 $ 29,000 $ 165,000 Management reviews securities with unrealized losses for other than temporary impairment. As of December 31, 2019 , there were 86 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 28 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, 2019 is summarized below: Less than 12 months 12 months or more Total Fair Unrealized Fair Unrealized Fair Unrealized As of December 31, 2019 Value Losses Value Losses Value Losses U.S. Government-sponsored agencies $ 12,372,000 $ (128,000 ) $ — $ — $ 12,372,000 $ (128,000 ) Mortgage-backed securities 54,244,000 (359,000 ) 18,696,000 (490,000 ) 72,940,000 (849,000 ) State and political subdivisions 10,532,000 (101,000 ) 304,000 (8,000 ) 10,836,000 (109,000 ) $ 77,148,000 $ (588,000 ) $ 19,000,000 $ (498,000 ) $ 96,148,000 $ (1,086,000 ) 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. 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 disclosed in Note 25, the FASB issued Accounting Standards Update (“ASU”) No. 2019–04 in April 2019. In December 2019, the Company elected to early adopt the amendments to Topic 815, Derivatives and Hedging, which allowed the Company a one–time reclassification of certain prepayable debt securities from held to maturity to available for sale. In December 2019, prepayable debt securities with a carrying value of $24.9 million and a net unrealized gain of $1.6 million were transferred from held to maturity to available for sale. The reclassified securities consisted of state and political subdivision municipal debt securities. The Company subsequently sold approximately $4.3 million of those securities at a gain of $209,000 recognized in 2019. 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 $182,000 at December 31, 2019 . 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, 2019 and 2018 , the Bank's investment in FHLB stock totaled $7,945,000 and $10,549,000 , 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, 2019 . The Bank will continue to monitor its investment in FHLB stock.

Mortgage Servicing Rights

Mortgage Servicing Rights	12 Months Ended
	Dec. 31, 2019
Transfers and Servicing [Abstract]
Mortgage Servicing Rights	Mortgage Servicing Rights At December 31, 2019 and 2018 , the Bank serviced loans for others totaling $266,173,000 and $261,654,000 , respectively. Net gains from the sale of loans, serviced by the bank, totaled $651,000 in 2019 , $490,000 in 2018 , and $737,000 in 2017 . In 2019 , mortgage servicing rights of $422,000 were capitalized and amortization for the year totaled $231,000 . At December 31, 2019 , mortgage servicing rights had a fair value of $2,089,000 . 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 . 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, 2019 , the prepayment assumption using the PSA model was 220 , which translates into an anticipated annual prepayment rate of 13.20% . 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, 2019 2018 Mortgage servicing rights $ 6,140,000 $ 5,718,000 Accumulated amortization (4,594,000 ) (4,364,000 ) $ 1,546,000 $ 1,354,000

Loans

Loans	12 Months Ended
	Dec. 31, 2019
Loans and Leases Receivable Disclosure [Abstract]
Loans	Loans The following table shows the composition of the Company's loan portfolio as of December 31, 2019 and 2018 : December 31, 2019 December 31, 2018 Commercial Real estate $ 372,810,000 28.7 % $ 353,243,000 28.5 % Construction 38,084,000 3.0 % 27,304,000 2.2 % Other 218,773,000 16.9 % 196,391,000 15.9 % Municipal 41,288,000 3.2 % 51,128,000 4.1 % Residential Term 492,455,000 37.9 % 469,145,000 37.9 % Construction 14,813,000 1.2 % 17,743,000 1.4 % Home equity line of credit 92,349,000 7.1 % 98,469,000 8.0 % Consumer 26,503,000 2.0 % 24,860,000 2.0 % Total loans $ 1,297,075,000 100.0 % $ 1,238,283,000 100.0 % Loan balances include net deferred loan costs of $7,419,000 in 2019 and $6,615,000 in 2018 . Pursuant to collateral agreements, qualifying first mortgage loans and commercial real estate, which totaled $296,871,000 and $290,138,000 at December 31, 2019 and 2018 , respectively, were used to collateralize borrowings from the Federal Home Loan Bank of Boston. In addition, commercial, residential construction and home equity loans totaling $240,133,000 at December 31, 2019 and $237,152,000 at December 31, 2018 were used to collateralize a standby line of credit at the Federal Reserve Bank of Boston that is currently unused. At December 31, 2019 and 2018 , non-accrual loans were $16,649,000 and $14,727,000 , respectively. For the years ended December 31, 2019 , 2018 and 2017 , interest income which would have been recognized on these loans, if interest had been accrued, was $906,000 , $811,000 , and $496,000 , respectively. Loans more than 90 days past due accruing interest totaled $1,560,000 at December 31, 2019 and $351,000 at December 31, 2018 . 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 $35,071,000 at December 31, 2019 and $34,566,000 at December 31, 2018 . A summary of loans to directors and executive officers is as follows: For the years ended December 31, 2019 2018 Balance at beginning of year $ 22,149,000 $ 22,354,000 New loans 521,000 1,341,000 Repayments (1,536,000 ) (1,192,000 ) Retired director — (354,000 ) Balance at end of year $ 21,134,000 $ 22,149,000 Information on the past-due status of loans as of December 31, 2019 , 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 $ 786,000 $ 377,000 $ 611,000 $ 1,774,000 $ 371,036,000 $ 372,810,000 $ — Construction — 14,000 257,000 271,000 37,813,000 38,084,000 — Other 2,764,000 465,000 1,799,000 5,028,000 213,745,000 218,773,000 1,464,000 Municipal — — — — 41,288,000 41,288,000 — Residential Term 1,129,000 1,132,000 2,379,000 4,640,000 487,815,000 492,455,000 86,000 Construction — — — — 14,813,000 14,813,000 — Home equity line of credit 1,169,000 58,000 1,730,000 2,957,000 89,392,000 92,349,000 — Consumer 291,000 46,000 10,000 347,000 26,156,000 26,503,000 10,000 Total $ 6,139,000 $ 2,092,000 $ 6,786,000 $ 15,017,000 $ 1,282,058,000 $ 1,297,075,000 $ 1,560,000 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 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, 2019 and 2018 is presented in the following table: As of December 31, 2019 2018 Commercial Real estate $ 1,784,000 $ 1,226,000 Construction 256,000 — Other 6,534,000 8,664,000 Municipal — — Residential Term 5,899,000 4,062,000 Construction — — Home equity line of credit 2,171,000 760,000 Consumer 5,000 15,000 Total $ 16,649,000 $ 14,727,000 Information regarding impaired loans is as follows: For the years ended December 31, 2019 2018 2017 Average investment in impaired loans $ 31,557,000 $ 31,805,000 $ 29,108,000 Interest income recognized on impaired loans, all on cash basis 735,000 864,000 784,000 As of December 31, 2019 2018 Balance of impaired loans $ 29,274,000 $ 31,751,000 Less portion for which no allowance for loan losses is allocated (18,212,000 ) (21,030,000 ) Portion of impaired loan balance for which an allowance for loan losses is allocated $ 11,062,000 $ 10,721,000 Portion of allowance for loan losses allocated to the impaired loan balance $ 2,213,000 $ 2,308,000 Impaired loans include troubled debt 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, 2019 , 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 $ 5,235,000 $ 5,492,000 $ — $ 7,611,000 $ 228,000 Construction 958,000 970,000 — 936,000 47,000 Other 756,000 786,000 — 965,000 29,000 Municipal — — — — — Residential Term 10,176,000 11,931,000 — 10,033,000 269,000 Construction — — — — — Home equity line of credit 1,087,000 1,151,000 — 997,000 20,000 Consumer — — — — — $ 18,212,000 $ 20,330,000 $ — $ 20,542,000 $ 593,000 With an Allowance Recorded Commercial Real estate $ 1,074,000 $ 1,093,000 $ 251,000 $ 1,528,000 $ 60,000 Construction — — — — — Other 6,319,000 6,925,000 1,273,000 6,778,000 — Municipal — — — — — Residential Term 2,263,000 2,412,000 237,000 2,424,000 82,000 Construction — — — — — Home equity line of credit 1,401,000 1,412,000 447,000 283,000 — Consumer 5,000 6,000 5,000 2,000 — $ 11,062,000 $ 11,848,000 $ 2,213,000 $ 11,015,000 $ 142,000 Total Commercial Real estate $ 6,309,000 $ 6,585,000 $ 251,000 $ 9,139,000 $ 288,000 Construction 958,000 970,000 — 936,000 47,000 Other 7,075,000 7,711,000 1,273,000 7,743,000 29,000 Municipal — — — — — Residential Term 12,439,000 14,343,000 237,000 12,457,000 351,000 Construction — — — — — Home equity line of credit 2,488,000 2,563,000 447,000 1,280,000 20,000 Consumer 5,000 6,000 5,000 2,000 — $ 29,274,000 $ 32,178,000 $ 2,213,000 $ 31,557,000 $ 735,000 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, 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 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 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, 2019 , the Company had 81 loans with a value of $21,424,000 that have been classified as TDRs. This compares to 76 loans with a value of $25,222,000 classified as TDRs as of December 31, 2018 . 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, 2019 : Number of Loans Balance Specific Reserves Commercial Real estate 17 $ 4,836,000 $ 246,000 Construction 1 701,000 — Other 8 6,932,000 1,231,000 Municipal — — — Residential Term 52 8,472,000 200,000 Construction — — — Home equity line of credit 3 483,000 — Consumer — — — 81 $ 21,424,000 $ 1,677,000 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 As of December 31, 2019 , 13 of the loans classified as TDRs with a total balance of $1,510,000 were more than 30 days past due. Two 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, 2019 : Number of Loans Balance Specific Reserves Commercial Real estate — $ — $ — Construction — — — Other 4 371,000 131,000 Municipal — — — Residential Term 8 972,000 86,000 Construction — — — Home equity line of credit 1 167,000 — Consumer — — — 13 $ 1,510,000 $ 217,000 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 For the year ended December 31, 2019 , 11 loans were placed 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, 2019 : Number of Loans Pre-Modification Outstanding Recorded Investment Post-Modification Outstanding Recorded Investment Specific Reserves Commercial Real estate 2 $ 109,000 $ 90,000 90,000 Construction — — — — Other 1 98,000 98,000 — Municipal — — — — Residential Term 8 996,000 872,000 72,000 Construction — — — — Home equity line of credit — — — — Consumer — — — — 11 $ 1,203,000 $ 1,060,000 162,000 For the year ended December 31, 2018 , 18 loans were placed in TDR status. The following table shows these TDRs by class and the associated specific reserves included in the allowance for loan losses as for 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 As of December 31, 2019 , Management is aware of nine loans classified as TDRs that are involved in bankruptcy with an outstanding balance of $987,000 . As of December 31, 2019 , there were 26 loans with an outstanding balance of $8,799,000 that were classified as TDRs and were on non-accrual status, two of which, with an outstanding balance of $350,000 , were in the process of foreclosure. Residential Mortgage Loans in Process of Foreclosure As of December 31, 2019 , there were 14 mortgage loans collateralized by residential real estate in the process of foreclosure with a total balance of $1,502,000 ; this compares to 11 mortgage loans collateralized by residential real estate in the process of foreclosure with a total balance of $1,131,000 as of December 31, 2018 .

Allowance for Loan Losses

Allowance for Loan Losses	12 Months Ended
	Dec. 31, 2019
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, 2019 and 2018 : As of December 31, 2019 2018 Allowance for Loans Evaluated Individually for Impairment Commercial Real estate $ 251,000 $ 260,000 Construction — — Other 1,273,000 1,696,000 Municipal — — Residential Term 237,000 335,000 Construction — — Home equity line of credit 447,000 17,000 Consumer 5,000 — Total $ 2,213,000 $ 2,308,000 Allowance for Loans Evaluated Collectively for Impairment Commercial Real estate $ 3,491,000 $ 3,307,000 Construction 365,000 255,000 Other 2,056,000 1,845,000 Municipal 27,000 24,000 Residential Term 787,000 900,000 Construction 25,000 34,000 Home equity line of credit 631,000 713,000 Consumer 862,000 630,000 Unallocated 1,182,000 1,216,000 Total $ 9,426,000 $ 8,924,000 Total Allowance for Loan Losses Commercial Real estate $ 3,742,000 $ 3,567,000 Construction 365,000 255,000 Other 3,329,000 3,541,000 Municipal 27,000 24,000 Residential Term 1,024,000 1,235,000 Construction 25,000 34,000 Home equity line of credit 1,078,000 730,000 Consumer 867,000 630,000 Unallocated 1,182,000 1,216,000 Total $ 11,639,000 $ 11,232,000 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, 2019 and 2018 , by class of financing receivable and allowance element, is presented in the following tables: As of December 31, 2019 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 $ 251,000 $ 729,000 $ 2,762,000 $ — $ 3,742,000 Construction — 76,000 289,000 — 365,000 Other 1,273,000 430,000 1,626,000 — 3,329,000 Municipal — — 27,000 — 27,000 Residential Term 237,000 153,000 634,000 — 1,024,000 Construction — 5,000 20,000 — 25,000 Home equity line of credit 447,000 130,000 501,000 — 1,078,000 Consumer 5,000 460,000 402,000 — 867,000 Unallocated — — — 1,182,000 1,182,000 $ 2,213,000 $ 1,983,000 $ 6,261,000 $ 1,182,000 $ 11,639,000 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 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 0.48% of related loans as of December 31, 2019 and 0.45% of related loans as of December 31, 2018 . The qualitative portion increased $638,000 between December 31, 2018 and December 31, 2019 due to a mix of factors. The unallocated component totaled $1,182,000 at December 31, 2019 , or 10.2% of the total reserve. This compares to $1,216,000 or 10.8% as of December 31, 2018 . Management considers these levels appropriate as they supported general imprecision related to portfolio growth and included 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 may be 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 0.90% as of December 31, 2019 , compared to 0.91% of total loans as of December 31, 2018 . 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 27.9% of capital at December 31, 2019 are below the regulatory guidance of 100.0% of capital. Construction loans and non- owner-occupied commercial real estate loans are at 123.0% of total capital at December 31, 2019 , 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. Approximately 60% of a trailing four quarter average gross commercial portfolio is subject to review and validation annually by an independent consulting firm. Additionally, commercial loan relationships with exposure greater than or equal to $500,000 are subject to review annually by the Company'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, 2019 : Commercial Real Estate Commercial Construction Commercial Other Municipal Loans All Risk- Rated Loans 1 Strong $ — $ — $ 4,258,000 $ 32,000 $ 4,290,000 2 Above average 12,393,000 794,000 6,187,000 38,290,000 57,664,000 3 Satisfactory 74,709,000 2,305,000 41,527,000 379,000 118,920,000 4 Average 205,510,000 19,017,000 107,389,000 2,587,000 334,503,000 5 Watch 63,582,000 15,488,000 47,152,000 — 126,222,000 6 OAEM 1,160,000 — 1,988,000 — 3,148,000 7 Substandard 15,456,000 480,000 10,272,000 — 26,208,000 8 Doubtful — — — — — Total $ 372,810,000 $ 38,084,000 $ 218,773,000 $ 41,288,000 $ 670,955,000 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, 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 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, 2019 . 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, 2019 , 2018 and 2017 : For the year ended December 31, 2019 Commercial Residential Home Equity Line of Credit Real Estate Construction Other Municipal Term Construction Consumer Unallocated Total Allowance for loan losses: Beginning 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 Chargeoffs 89,000 — 179,000 — 445,000 — 69,000 338,000 — 1,120,000 Recoveries 15,000 — 73,000 — 57,000 — 4,000 128,000 — 277,000 Provision (credit) 249,000 110,000 (106,000 ) 3,000 177,000 (9,000 ) 413,000 447,000 (34,000 ) 1,250,000 Ending balance $ 3,742,000 $ 365,000 $ 3,329,000 $ 27,000 $ 1,024,000 $ 25,000 $ 1,078,000 $ 867,000 $ 1,182,000 $ 11,639,000 Ending balance specifically evaluated for impairment $ 251,000 $ — $ 1,273,000 $ — $ 237,000 $ — $ 447,000 $ 5,000 $ — $ 2,213,000 Ending balance collectively evaluated for impairment $ 3,491,000 $ 365,000 $ 2,056,000 $ 27,000 $ 787,000 $ 25,000 $ 631,000 $ 862,000 $ 1,182,000 $ 9,426,000 Related loan balances: Ending balance $ 372,810,000 $ 38,084,000 $ 218,773,000 $ 41,288,000 $ 492,455,000 $ 14,813,000 $ 92,349,000 $ 26,503,000 $ — $ 1,297,075,000 Ending balance specifically evaluated for impairment $ 6,309,000 $ 958,000 $ 7,075,000 $ — $ 12,439,000 $ — $ 2,488,000 $ 5,000 $ — $ 29,274,000 Ending balance collectively evaluated for impairment $ 366,501,000 $ 37,126,000 $ 211,698,000 $ 41,288,000 $ 480,016,000 $ 14,813,000 $ 89,861,000 $ 26,498,000 $ — $ 1,267,801,000 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

Premises and Equipment

Premises and Equipment	12 Months Ended
	Dec. 31, 2019
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, 2019 2018 Land $ 5,100,000 $ 4,852,000 Land improvements 1,100,000 1,105,000 Buildings 21,946,000 22,301,000 Equipment 12,858,000 12,461,000 41,004,000 40,719,000 Less accumulated depreciation 19,699,000 18,663,000 $ 21,305,000 $ 22,056,000 Future minimum receipts under lease agreements at December 31, 2019 for each of the next five years and in the aggregate are: 2020 $129,000 2021 129,000 2022 125,000 2023 41,000 2024 16,000 Thereafter — $440,000

Other Real Estate Owned

Other Real Estate Owned	12 Months Ended
	Dec. 31, 2019
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, 2019 2018 Real estate acquired in settlement of loans $ 279,000 $ 584,000 Changes in the allowance for losses from other real estate owned were as follows: For the years ended December 31, 2019 2018 2017 Balance at beginning of year $ — $ 53,000 $ 205,000 Losses charged to allowance — (53,000 ) (169,000 ) Provision charged to operating expenses — — 17,000 Balance at end of year $ — $ — $ 53,000

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2019
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, 2019 2018 2017 Federal income tax Current $ 3,978,000 $ 4,407,000 $ 4,184,000 Deferred 336,000 (492,000 ) 2,083,000 4,314,000 3,915,000 6,267,000 State franchise tax 421,000 391,000 345,000 $ 4,735,000 $ 4,306,000 $ 6,612,000 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, 2019 2018 2017 Expected tax expense $ 6,355,000 $ 5,847,000 $ 9,170,000 Non-taxable income (1,749,000 ) (1,699,000 ) (2,625,000 ) State franchise tax, net of federal tax benefit 332,000 309,000 224,000 Equity compensation (45,000 ) (55,000 ) (83,000 ) Tax credits, net of amortization (85,000 ) (85,000 ) (88,000 ) Change in federal tax rate — — 134,000 Other (73,000 ) (11,000 ) (120,000 ) $ 4,735,000 $ 4,306,000 $ 6,612,000 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, 2019 and 2018 are as follows: 2019 2018 Allowance for loan losses $ 2,444,000 $ 2,359,000 Accrued pension and post-retirement 926,000 955,000 Unrealized loss on securities available for sale — 1,343,000 Unrealized loss on securities transferred from available for sale to held to maturity 48,000 52,000 Restricted stock grants 203,000 170,000 Core deposit intangible 21,000 18,000 Investment in flow through entities 55,000 31,000 Other assets — 24,000 Total deferred tax asset 3,697,000 4,952,000 Net deferred loan costs (1,669,000 ) (1,504,000 ) Depreciation (1,434,000 ) (1,300,000 ) Unrealized gain on securities available for sale (972,000 ) — Goodwill (120,000 ) (80,000 ) Mortgage servicing rights (325,000 ) (284,000 ) Unrealized gain on derivative instruments (26,000 ) (382,000 ) Prepaid expense (205,000 ) (159,000 ) Total deferred tax liability (4,751,000 ) (3,709,000 ) Net deferred tax asset (liability) $ (1,054,000 ) $ 1,243,000 At December 31, 2019 , the Company held investments in four limited partnerships with related low income housing tax credits compared to three at December 31, 2018 . The tax credits from the investments are estimated at $330,000 and $210,000 for the years ended December 31, 2019 and 2018 , respectively, and are recorded as a reduction of income tax expense. Amortization of the investment in the limited partnership totaled $307,000 and $186,000 for the years ended December 31, 2019 and 2018 , respectively, and is recognized as a component of income tax expense in the consolidated statements of income. The carrying value of these investments was $1,951,000 at December 31, 2019 and $1,408,000 at December 31, 2018 , and is recorded in other assets. The Company's total exposure to the limited partnerships was $1,951,000 at December 31, 2019 and $1,408,000 at December 31, 2018 , 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 2019 .

Certificates of Deposit

Certificates of Deposit	12 Months Ended
	Dec. 31, 2019
Banking and Thrift [Abstract]
Certificates of Deposit	Certificates of Deposit The following table represents the breakdown of certificates of deposit at December 31, 2019 and 2018 : December 31, 2019 December 31, 2018 Certificates of deposit < $100,000 $ 277,225,000 $ 372,464,000 Certificates $100,000 to $250,000 345,241,000 162,185,000 Certificates $250,000 and over 67,513,000 56,760,000 $ 689,979,000 $ 591,409,000 At December 31, 2019 , 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 2020 $ 176,860,000 $ 330,371,000 $ 507,231,000 2021 21,055,000 26,236,000 47,291,000 2022 35,923,000 17,932,000 53,855,000 2023 24,687,000 33,493,000 58,180,000 2024 18,549,000 4,722,000 23,271,000 2025 and thereafter 151,000 — 151,000 $ 277,225,000 $ 412,754,000 $ 689,979,000 Interest on certificates of deposit of $100,000 or more was $6,060,000 , $3,038,000 , and $2,105,000 in 2019 , 2018 and 2017 , respectively.

Borrowed Funds

Borrowed Funds	12 Months Ended
	Dec. 31, 2019
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, 2019 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 $51,000,000 in credit lines with correspondent banks and a credit facility of $119,000,000 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, 2019 and 2018 have the following range of interest rates and maturity dates: As of December 31, 2019 Federal Home Loan Bank Advances 2020 1.60% - 1.97% $ 137,400,000 2021 1.55% 10,000,000 2022 0.00% — 2023 0.00% — 2024 0.00% 105,000 2025 and thereafter 0.00% — 147,505,000 Repurchase agreements Municipal and commercial customers 0.10% - 2.33% 37,450,000 $ 184,955,000 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

Employee Benefit Plans

Employee Benefit Plans	12 Months Ended
	Dec. 31, 2019
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 2019 , 2018 , and 2017 . The expense related to the 401(k) plan was $575,000 , $578,000 , and $554,000 in 2019 , 2018 , and 2017 , 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 $165,000 in 2019 , $176,000 in 2018 , and $219,000 in 2017 . As of December 31, 2019 and 2018 , the accrued liability of these plans was $2,828,000 and $2,949,000 , 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, 2019 2018 2017 Change in benefit obligations Benefit obligation at beginning of year: $ 1,599,000 $ 1,874,000 $ 1,870,000 Interest cost 66,000 77,000 77,000 Benefits paid (97,000 ) (117,000 ) (113,000 ) Actuarial (gain) loss 13,000 (235,000 ) 40,000 Benefit obligation at end of year: $ 1,581,000 $ 1,599,000 $ 1,874,000 Funded status Benefit obligation at end of year $ (1,581,000 ) $ (1,599,000 ) $ (1,874,000 ) Unamortized (gain) loss (31,000 ) (47,000 ) 186,000 Accrued benefit cost $ (1,612,000 ) $ (1,646,000 ) $ (1,688,000 ) Weighted average discount rate as of December 31 3.00 % 4.25 % 4.25 % The following table sets forth the net periodic benefit cost: For the years ended December 31, 2019 2018 2017 Components of net periodic benefit cost Interest cost $ 66,000 $ 77,000 $ 77,000 Amortization of loss — — — Other settlement (income) expense (2,000 ) (3,000 ) 11,000 Net periodic benefit cost $ 64,000 $ 74,000 $ 88,000 Weighted average discount rate for net periodic cost 3.00 % 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 2020 is $108,000 . For years ending 2021 through 2024 , the estimated amount of benefits to be paid is $106,000 , $103,000 , $101,000 and $107,000 , respectively, and the total estimated amount of benefits to be paid for years ended 2025 through 2028 is $496,000 . Plan expense for 2020 is estimated to be $64,000 . 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, 2019 2018 Portion to Be Recognized in Income in 2020 Unamortized net actuarial gain (loss) $ 31,000 $ 47,000 $ (158,000 ) Deferred tax (expense) benefit at 21% (7,000 ) (10,000 ) 33,000 Net unrecognized post-retirement benefits included in accumulated other comprehensive income (loss) $ 24,000 $ 37,000 $ (125,000 )

Other Comprehensive Income (Los

Other Comprehensive Income (Loss)	12 Months Ended
	Dec. 31, 2019
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, 2019 , 2018 and 2017 . For the years ended December 31, 2019 2018 2017 Balance at beginning of year $ (5,051,000 ) $ (2,901,000 ) $ (935,000 ) Unrealized gains (losses) arising during the year 11,247,000 (2,585,000 ) (1,763,000 ) Reclassification of realized gains during the year (224,000 ) (137,000 ) (471,000 ) Related deferred taxes (2,315,000 ) 572,000 782,000 Reclassification adjustment for effect of enacted tax law changes — — (514,000 ) Net change 8,708,000 (2,150,000 ) (1,966,000 ) Balance at end of year $ 3,657,000 $ (5,051,000 ) $ (2,901,000 ) 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, 2019 , 2018 , and 2017 . For the years ended December 31, 2019 2018 2017 Balance at beginning of year $ (197,000 ) $ (174,000 ) $ (129,000 ) Amortization of net unrealized gains (losses) 19,000 (29,000 ) (22,000 ) Related deferred taxes (4,000 ) 6,000 8,000 Reclassification adjustment for effect of enacted tax law changes — — (31,000 ) Net change 15,000 (23,000 ) (45,000 ) Balance at end of year $ (182,000 ) $ (197,000 ) $ (174,000 ) 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, 2019 , 2018 , and 2017 . For the years ended December 31, 2019 2018 2017 Balance at beginning of year $ 1,438,000 $ 1,544,000 $ 1,163,000 Unrealized gains (losses) on cash flow hedging derivatives arising during the year (1,697,000 ) (134,000 ) 165,000 Related deferred taxes 356,000 28,000 (58,000 ) Reclassification adjustment for effect of enacted tax law changes — — 274,000 Net change (1,341,000 ) (106,000 ) 381,000 Balance at end of year $ 97,000 $ 1,438,000 $ 1,544,000 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, 2019 , 2018 , and 2017 : For the years ended December 31, 2019 2018 2017 Unrecognized postretirement benefits at beginning of year $ 37,000 $ (147,000 ) $ (102,000 ) Change in unamortized net actuarial gain (loss) (16,000 ) 233,000 (30,000 ) Related deferred taxes 3,000 (49,000 ) 11,000 Reclassification adjustment for effect of enacted tax law changes — — (26,000 ) Net change (13,000 ) 184,000 (45,000 ) Unrecognized postretirement benefits at end of year $ 24,000 $ 37,000 $ (147,000 ) The reclassification of accumulated losses is a component of net periodic benefit cost (see Note 12) and the income tax effect is included in the income tax expense line of the consolidated statements of income and comprehensive income.

Financial Derivative Instrument

Financial Derivative Instruments	12 Months Ended
	Dec. 31, 2019
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Financial Derivative Instruments	Financial Derivative Instruments The Bank uses derivative financial instruments for risk management purposes and not for trading or speculative purposes. As part of its overall asset and liability management strategy, the Bank periodically uses derivative instruments to minimize significant unplanned fluctuations in earnings and cash flows caused by interest rate volatility. The Bank’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 Bank recognizes its derivative instruments in the consolidated balance sheet at fair value. On the date the derivative instrument is entered into, the Bank designates whether the derivative is part of a hedging relationship (i.e., cash flow or fair value hedge). The Bank formally documents relationships between hedging instruments and hedged items, as well as its risk management objective and strategy for undertaking hedge transactions. The Bank 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 Bank 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. The details of the interest rate swap agreements are as follows: December 31, 2019 December 31, 2018 Effective Date Maturity Date Variable Index Received Fixed Rate Paid Presentation on Consolidated Balance Sheet Notional Amount Fair Value Notional Amount Fair Value 06/27/16 06/27/21 1-Month USD LIBOR 0.893 % Other Assets $ 20,000,000 $ 199,000 $ 20,000,000 $ 763,000 06/28/16 06/28/21 1-Month USD LIBOR 0.940 % Other Assets 30,000,000 278,000 30,000,000 1,110,000 06/05/18 12/05/19 1-Month USD LIBOR 2.466 % Other Assets — — 25,000,000 16,000 06/05/18 06/05/20 1-Month USD LIBOR 2.547 % Other Liabilities 25,000,000 (96,000 ) 25,000,000 (9,000 ) 06/05/18 12/05/20 1-Month USD LIBOR 2.603 % Other Liabilities 25,000,000 (234,000 ) 25,000,000 (60,000 ) 12/05/19 12/05/22 3-Month USD LIBOR 1.779 % Other Liabilities 25,000,000 (98,000 ) — — 08/02/19 08/02/24 1-Month USD Libor 1.590 % Other Liabilities 12,500,000 (11,000 ) — — 08/05/19 08/05/24 1-Month USD Libor 1.420 % Other Assets 12,500,000 85,000 — — $ 150,000,000 $ 123,000 $ 125,000,000 $ 1,820,000 The Company would reclassify unrealized gains or losses accounted for within accumulated other comprehensive income (loss) into earnings if the interest rate swaps were to become ineffective or the swaps were to terminate. In the next 12 months, the Company does not believe it will be required to reclassify any unrealized gains or losses accounted for within accumulated other comprehensive income (loss) into earnings as a result of ineffectiveness. Amounts paid or received under the swaps are reported in interest expense in the statement of income, and in interest paid in the statement of cash flows. Customer loan derivatives The Company will enter into interest rate swaps with qualified commercial customers. Through these arrangements, the Bank is able to provide a means for a loan customer to obtain a long-term fixed rate, while it simultaneously contracts with an approved, highly-rated, third-party financial institution as counterparty to swap the fixed rate for a variable rate. Such loan level arrangements are not designated as hedges for accounting purposes, and are recorded at fair value in the Company’s consolidated balance sheet. At December 31, 2019 there were two customer loan swap arrangement in place, detailed below: December 31, 2019 December 31, 2018 Presentation on Consolidated Balance Sheet Number of Positions Notional Amount Fair Value Number of Positions Notional Amount Fair Value Pay Fixed, Receive Variable Other Liabilities 2 $ 16,374,000 $ (1,205,000 ) — — — Receive Fixed, Pay Variable Other Assets 2 16,374,000 1,205,000 — — — Total 4 $ 32,748,000 — — — — Derivative collateral The Company has entered into a master netting arrangement with its counterparty and settles payments with the counterparty as necessary. The Bank's arrangement with its institutional counterparty requires it to post cash or other assets as collateral for its various swap contracts in a net liability position based on their fair values and the Bank's credit rating or receive cash collateral for contracts in a net asset position as requested. At December 31, 2019 , the Bank had posted to the counterparty $3,050,000 of cash as collateral on its swap contracts. The required amount to be pledged was $1,113,000 . Cessation of LIBOR As discussed in Item 1A Risk Factors, the Company is aware that LIBOR may no longer be published after December 31, 2021. The International Swap and Derivatives Association ("ISDA"), the organization that oversees and guides swap and derivatives markets and participants, continues to work on transitions and replacement rates, including having replacement rates in place before the possible cessation of LIBOR at the end of 2021, and has committed to providing more definitive recommendations later in 2020. The Company intends to continue to monitor these developments closely and expects to pursue the steps ultimately recommended by ISDA to provide for an orderly transition to a post-LIBOR environment. Of the interest rate swap contracts the Company has in place as of December 31, 2019, four contracts carrying a total notional amount of $100 million are set to mature prior to December 31, 2021; three contracts with a total notional amount of $50 million have maturity dates beyond December 31, 2021. The two customer loan swap contracts shown in the table immediately above have maturity dates of December 19, 2029 and October 1, 2039.

Preferred and Common Stock

Preferred and Common Stock	12 Months Ended
	Dec. 31, 2019
Stockholders' Equity Note [Abstract]
Common Stock	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, 2019 , 52,819 shares had been issued pursuant to these plans, leaving 197,181 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 elected to participate in the stock purchase or savings investment plans. Sales of stock to directors and employees amounted to 13,408 shares in 2019 , 12,138 shares in 2018 , and 12,762 shares in 2017 . 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, 2019 , 278,526 shares have been issued, leaving 321,474 shares available 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 11,242 shares in 2019 , 9,524 shares in 2018 , and 9,922 shares in 2017 . Proceeds from issuances of common stock under these plans totaled $653,000 , $619,000 and $632,000 for the years ended December 31, 2019 , 2018 and 2017 , respectively.

Stock Options and Stock-Based C

Stock Options and Stock-Based Compensation	12 Months Ended
	Dec. 31, 2019
Share-based Payment Arrangement [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. The plan expires on April 28, 2020; thus no further grants or awards will be made under this plan after that date. As of December 31, 2019 , 162,892 shares of restricted stock had been granted under the 2010 Plan, of which 65,039 shares remain restricted as of December 31, 2019 as detailed in the following table: Year Granted Vesting Term (In Years) Shares Remaining Term (In Years) 2015 5.0 8,904 0.2 2016 5.0 10,874 1.1 2017 3.0 4,602 0.1 2017 5.0 7,017 2.1 2018 2.0 932 0.1 2018 3.0 5,371 1.1 2018 4.0 2,068 2.0 2018 5.0 6,184 3.0 2019 1.0 1,349 0.1 2019 2.0 1,484 1.1 2019 3.0 16,254 2.1 65,039 1.3 The compensation cost related to these restricted stock grants was $1,570,000 and will be recognized over the vesting terms of each grant. In 2019 , $565,000 of expense was recognized for these restricted shares, leaving $600,000 in unrecognized expense as of December 31, 2019 . In 2018 , $381,000 of expense was recognized for restricted shares, leaving $678,000 in unrecognized expense as of December 31, 2018 .

Earnings Per Share

Earnings Per Share	12 Months Ended
	Dec. 31, 2019
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, 2019 , 2018 and 2017 : Income (Numerator) Shares (Denominator) Per-Share Amount For the year ended December 31, 2019 Net income as reported $ 25,525,000 Basic EPS: Income available to common shareholders 25,525,000 10,815,718 $ 2.36 Effect of dilutive securities: restricted stock 73,591 Diluted EPS: Income available to common shareholders plus assumed conversions $ 25,525,000 10,889,309 $ 2.34 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

Regulatory Capital Requirements

Regulatory Capital Requirements	12 Months Ended
	Dec. 31, 2019
Broker-Dealer, Net Capital Requirement, SEC Regulation [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 2020 will be 2020 earnings plus retained earnings of $26,111,000 from 2019 and 2018 . 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 was phased in from 0.0% for 2015 to 2.50% in 2019. As of December 31, 2019 , the Company's capital conservation buffer was 7.19% , and met the fully phased-in 2019 minimum requirement. As of December 31, 2019 , 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, 2019 Tier 2 capital to $ 189,421,000 $ 99,756,000 $ 124,695,000 risk-weighted assets 15.19 % 8.00 % 10.00 % Tier 1 capital to $ 177,682,000 $ 74,817,000 $ 99,756,000 risk-weighted assets 14.25 % 6.00 % 8.00 % Common equity Tier 1 capital to $ 177,682,000 $ 56,113,000 $ 81,052,000 risk-weighted assets 14.25 % 4.50 % 6.50 % Tier 1 capital to $ 177,682,000 $ 80,385,000 $ 100,481,000 average assets 8.84 % 4.00 % 5.00 % 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 % 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, 2019 Tier 2 capital to $ 190,412,000 $ 99,756,000 n/a risk-weighted assets 15.27 % 8.00 % n/a Tier 1 capital to $ 178,773,000 $ 74,817,000 n/a risk-weighted assets 14.34 % 6.00 % n/a Common equity Tier 1 capital to $ 178,773,000 $ 56,113,000 n/a risk-weighted assets 14.34 % 4.50 % n/a Tier 1 capital to $ 178,773,000 $ 80,527,000 n/a average assets 8.88 % 4.00 % n/a 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

Off-Balance-Sheet Financial Ins

Off-Balance-Sheet Financial Instruments and Concentrations of Credit Risk	12 Months Ended
	Dec. 31, 2019
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 2019 , 2018 or 2017 . 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, 2019 and 2018 , the Bank had the following off-balance-sheet financial instruments, whose contract amounts represent credit risk: As of December 31, 2019 2018 Unused lines, collateralized by residential real estate $ 81,193,000 $ 83,421,000 Other unused commitments 90,186,000 60,033,000 Standby letters of credit 4,496,000 3,590,000 Commitments to extend credit 19,702,000 19,268,000 Total $ 195,577,000 $ 166,312,000 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 Bank periodically uses derivative instruments to minimize significant unplanned fluctuations in earnings and cash flows caused by interest rate volatility. The Bank'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, 2019 , the Company had seven outstanding, off-balance sheet, derivative instruments designated as cash flow hedges. These derivative instruments were interest rate swap agreements, with notional principal amounts totaling $150,000,000 and an unrealized gain of $97,000 , net of tax. The notional amounts and net unrealized gain (loss) of the financial derivative instruments do not represent exposure to credit loss. The Bank 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, 2019 , the Bank's derivative instrument counterparties were credit rated “A” by the major credit rating agencies. The interest rate swap agreements were entered into by the Bank to limit its exposure to rising interest rates. The Bank also enters into swap arrangements with qualified loan customers as a means to provide these customers with access to long-term fixed interest rates for borrowings, and simultaneously enters into a swap contract with an approved third- party financial institution. The terms of the two contracts are designed to offset one another resulting in their being neither a net gain or a loss. The notional amounts of the financial derivative instruments do not represent exposure to credit loss. The Bank is exposed to credit loss only to the extent that either counter-party defaults in its responsibility to pay interest under the terms of the agreements. Credit risk is mitigated by prudent underwriting of the loan customer and financial institution counterparties. As of December 31, 2019 , the Bank had customer loan swap contracts in place with a total notional value of $32,748,000 .

Fair Value Disclosures

Fair Value Disclosures	12 Months Ended
	Dec. 31, 2019
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, 2019 and 2018 , 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. Customer Loan Derivatives The valuation of the Company’s customer loan derivatives is obtained from a third-party pricing service and is determined using a discounted cash flow analysis on the expected cash flows of each derivative. The pricing analysis is based on observable inputs for the contractual terms of the derivatives, including the period to maturity and interest rate curves. The Company incorporates credit valuation adjustments to appropriately reflect both its own nonperformance risk and the respective counterparty’s nonperformance risk in the fair value measurements. In adjusting the fair value of its derivative contracts for the effect of nonperformance risk, the Company has considered the impact of master netting arrangements and any applicable credit enhancements, such as 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, 2019 and 2018 . At December 31, 2019 Level 1 Level 2 Level 3 Total Securities available for sale U.S. Government-sponsored agencies $ — $ 7,398,000 $ — $ 7,398,000 Mortgage-backed securities — 326,617,000 — 326,617,000 State and political subdivisions — 26,505,000 — 26,505,000 Total securities available for sale — 360,520,000 — 360,520,000 Interest rate swap agreements — 562,000 — 562,000 Customer loan interest swap agreements — 1,205,000 — 1,205,000 Total interest rate swap agreements — 1,767,000 — 1,767,000 Total assets $ — $ 362,287,000 $ — $ 362,287,000 At December 31, 2019 Level 1 Level 2 Level 3 Total Interest rate swap agreements $ — $ 439,000 $ — $ 439,000 Customer loan interest swap agreements — 1,205,000 — 1,205,000 Total liabilities $ — $ 1,644,000 $ — $ 1,644,000 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 — 1,889,000 — 1,889,000 Total assets $ — $ 319,305,000 $ — $ 319,305,000 At December 31, 2018 Level 1 Level 2 Level 3 Total Interest rate swap agreements $ — $ 69,000 $ — $ 69,000 Total liabilities $ — $ 69,000 $ — $ 69,000 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 at December 31, 2019 and 2018 . 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 $1,916,000 and $2,096,000 at December 31, 2019 and 2018 , respectively. At December 31, 2019 Level 1 Level 2 Level 3 Total Other real estate owned $ — $ 279,000 $ — $ 279,000 Impaired loans — 6,579,000 — 6,579,000 Total assets $ — $ 6,858,000 $ — $ 6,858,000 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 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, 2019 were as follows: Carrying Estimated As of December 31, 2019 value fair value Level 1 Level 2 Level 3 Financial assets Securities to be held to maturity $281,606,000 $287,045,000 $ — $287,045,000 $ — Loans (net of allowance for loan losses) Commercial Real estate 368,645,000 364,626,000 — 2,000 364,624,000 Construction 37,678,000 37,366,000 — — 37,366,000 Other 215,068,000 212,548,000 — 5,046,000 207,502,000 Municipal 41,258,000 40,552,000 — — 40,552,000 Residential Term 491,315,000 491,359,000 — 577,000 490,782,000 Construction 14,785,000 14,786,000 — — 14,786,000 Home equity line of credit 91,149,000 90,959,000 — 954,000 90,005,000 Consumer 25,538,000 23,489,000 — — 23,489,000 Total loans 1,285,436,000 1,275,685,000 — 6,579,000 1,269,106,000 Mortgage servicing rights 1,546,000 2,089,000 — 2,089,000 — Financial liabilities Local certificates of deposit $285,602,000 $281,480,000 — $281,480,000 — National certificates of deposit 404,377,000 412,337,000 — 412,337,000 — Total certificates of deposit deposits 689,979,000 693,817,000 — 693,817,000 — Repurchase agreements 37,450,000 37,450,000 — 37,450,000 — Federal Home Loan Bank advances 147,505,000 140,063,000 — 140,063,000 — Total borrowed funds 184,955,000 177,513,000 — 177,513,000 — 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 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 —

Other Operating Income and Expe

Other Operating Income and Expense	12 Months Ended
	Dec. 31, 2019
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, 2019 2018 2017 Other operating income ATM and debit card income $ 3,956,000 $ 3,556,000 $ 3,378,000 Other operating expense Advertising and marketing expense $ 1,174,000 $ 1,165,000 $ 1,208,000 Accounting and auditing expenses 828,000 837,000 818,000 ATM and interchange expense 1,176,000 995,000 886,000

Legal Contingencies

Legal Contingencies	12 Months Ended
	Dec. 31, 2019
Loss Contingency [Abstract]
Legal Contingencies	Legal Contingencies Various legal claims also arise from time to time in the normal course of business which, in the opinion of Management, will have no material effect on the Company's consolidated financial statements.

Reclassifications

Reclassifications	12 Months Ended
	Dec. 31, 2019
Prior Period Adjustment [Abstract]
Reclassifications	Reclassifications Certain items from prior years were reclassified in the financial statements to conform with the current year presentation. These do not have a material impact on the balance sheet or statement of income presentations.

Condensed Financial Information

Condensed Financial Information of Parent	12 Months Ended
	Dec. 31, 2019
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, 2019 2018 Assets Cash and cash equivalents $ 1,028,000 $ 1,190,000 Dividends receivable 3,200,000 2,950,000 Investment in subsidiary 183,654,000 162,763,000 Premises and equipment — 2,000 Goodwill 27,559,000 27,559,000 Other assets 337,000 232,000 Total assets $ 215,778,000 $ 194,696,000 Liabilities and shareholders' equity Dividends payable $ 3,270,000 $ 3,150,000 Other liabilities — 4,000 Total liabilities 3,270,000 3,154,000 Shareholders' equity Common stock 109,000 109,000 Additional paid-in capital 63,964,000 62,746,000 Retained earnings 148,435,000 128,687,000 Total shareholders' equity 212,508,000 191,542,000 Total liabilities and shareholders' equity $ 215,778,000 $ 194,696,000 Statements of Income For the years ended December 31, 2019 2018 2017 Interest and dividends on investments $ — $ — $ 15,000 Net securities gains (losses) — 137,000 (3,000 ) Total income — 137,000 12,000 Occupancy expense 1,000 2,000 5,000 Other operating expense 826,000 652,000 588,000 Total expense 827,000 654,000 593,000 Loss before income taxes and Bank earnings (827,000 ) (517,000 ) (581,000 ) Applicable income taxes (230,000 ) (164,000 ) (187,000 ) Loss before Bank earnings (597,000 ) (353,000 ) (394,000 ) Equity in earnings of Bank Remitted 12,600,000 11,300,000 11,180,000 Unremitted 13,522,000 12,589,000 8,802,000 Net income $ 25,525,000 $ 23,536,000 $ 19,588,000 Statements of Cash Flows For the years ended December 31, 2019 2018 2017 Cash flows from operating activities: Net income $ 25,525,000 $ 23,536,000 $ 19,588,000 Adjustments to reconcile net income to net cash provided by operating activities: Depreciation 2,000 — 5,000 Equity compensation expense 565,000 381,000 392,000 (Gain) loss on sale of investments — (137,000 ) 3,000 (Increase) decrease in other assets (105,000 ) 81,000 27,000 (Increase) decrease in dividends receivable (250,000 ) (450,000 ) 1,300,000 Increase (decrease) in dividends payable 120,000 551,000 (1,179,000 ) Decrease in other liabilities (4,000 ) — (3,000 ) Unremitted earnings of Bank (13,522,000 ) (12,589,000 ) (8,802,000 ) Net cash provided by operating activities 12,331,000 11,373,000 11,331,000 Cash flows from investing activities: Proceeds from sales/maturities of investments — 459,000 — Capital expenditures — 1,000 (4,000 ) Net cash provided by (used in) investing activities — 460,000 (4,000 ) Cash flows from financing activities: Purchase of common stock (183,000 ) (168,000 ) (154,000 ) Proceeds from sale of common stock 653,000 619,000 632,000 Dividends paid (12,963,000 ) (12,052,000 ) (11,460,000 ) Net cash used in financing activities (12,493,000 ) (11,601,000 ) (10,982,000 ) Net increase (decrease) in cash and cash equivalents (162,000 ) 232,000 345,000 Cash and cash equivalents at beginning of year 1,190,000 958,000 613,000 Cash and cash equivalents at end of year $ 1,028,000 $ 1,190,000 $ 958,000

New Accounting Pronouncements

New Accounting Pronouncements	12 Months Ended
	Dec. 31, 2019
Accounting Policies [Abstract]
New Accounting Pronouncements	New Accounting Pronouncements The FASB issued 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. Adoption of ASU No. 2014-09 was made on January 1, 2018 utilizing the modified retrospective approach. The adoption of the ASU did not have a material effect on the Company's consolidated financial statements. 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. The adoption of the ASU did not 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 was to be effective for all SEC registrants for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years. On October 16, 2019 FASB voted to finalize a proposal issued in August 2019 under which the effective implementation date was changed for SEC registrants meeting the definition of a Smaller Reporting Company to fiscal years beginning after December 15, 2022. Early adoption is permitted for fiscal years beginning after December 15, 2018, including interim periods within such years. The Company qualifies as a Smaller Reporting Company. It continues to evaluate the impact of the adoption of the ASU on its consolidated financial statements, and continues to anticipates that it may have a material impact upon adoption. 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, identified 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. The Bank is in the late stages of implementing this software and plans to run incurred loss and current expected credit models in parallel until adoption of ASU No. 2016-13. 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 there was 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. The adoption of this ASU did not 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 did 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 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 . This ASU makes minor changes to the disclosure requirements for employers that sponsor defined benefit pension and/or other postretirement benefit plans. ASU 2018-14 is effective for fiscal years ending after December 15, 2020; early adoption is permitted. As ASU 2018-14 only revises disclosure requirements, it will not have a material impact on the Company’s consolidated financial statements. In April 2019, the FASB issued ASU No. 2019–04, Codification Improvements to Topic 326, Financial Instruments – Credit Losses, Topic 815, Derivatives and Hedging, and Topic 825, Financial Instruments. With respect to Topic 815, Derivatives and Hedging, ASU 2019-04 clarifies that the reclassification of a debt security from held to maturity (“HTM”) to available for sale (“AFS”) under the transition guidance in ASU 2017-12 would not (1) call into question the classification of other HTM securities, (2) be required to actually designate any reclassified security in a last-of-layer hedge, or (3) be restricted from selling any reclassified security. As part of the transition of ASU 2019-04, entities may reclassify securities that would qualify for designation as the hedged item in a last-of-layer hedging relationship from HTM to AFS; however, entities that already made such a

Quarterly Information

Quarterly Information	12 Months Ended
	Dec. 31, 2019
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 2018Q1 2018Q2 2018Q3 2018Q4 2019Q1 2019Q2 2019Q3 2019Q4 Balance Sheets Cash and cash equivalents $ 16,559 $ 21,056 $ 21,649 $ 19,134 $ 15,270 $ 16,918 $ 21,418 $ 14,433 Interest-bearing deposits in other banks 280 1,616 51,045 12,079 231 917 16,714 11,310 Investments 562,459 565,125 562,839 573,079 606,495 625,097 625,584 642,126 Restricted equity securities 11,947 12,363 11,586 11,586 8,982 8,982 8,982 8,982 Net loans and loans held for sale 1,177,329 1,213,449 1,233,010 1,227,051 1,253,585 1,237,661 1,252,546 1,285,590 Other assets 103,241 100,352 101,725 101,641 106,782 109,124 107,983 106,355 Total assets $ 1,871,815 $ 1,913,961 $ 1,981,854 $ 1,944,570 $ 1,991,345 $ 1,998,699 $ 2,033,227 $ 2,068,796 Deposits $ 1,428,192 $ 1,416,646 $ 1,514,911 $ 1,527,085 $ 1,606,875 $ 1,592,956 $ 1,623,290 $ 1,650,466 Borrowed funds 244,229 297,455 265,274 210,317 170,419 181,858 181,417 184,955 Other liabilities 18,022 16,556 17,008 15,626 16,264 19,292 20,031 20,867 Shareholders' equity 181,372 183,304 184,661 191,542 197,787 204,593 208,489 212,508 Total liabilities & equity $ 1,871,815 $ 1,913,961 $ 1,981,854 $ 1,944,570 $ 1,991,345 $ 1,998,699 $ 2,033,227 $ 2,068,796 Income and Comprehensive Income Statements Interest income $ 16,451 $ 17,205 $ 18,086 $ 18,801 $ 19,268 $ 19,822 $ 19,904 $ 19,657 Interest expense 4,042 4,936 5,550 5,806 6,369 6,872 6,678 6,239 Net interest income 12,409 12,269 12,536 12,995 12,899 12,950 13,226 13,418 Provision for loan losses 500 500 333 167 375 250 250 375 Net interest income after provision for loan losses 11,909 11,769 12,203 12,828 12,524 12,700 12,976 13,043 Non-interest income 3,132 3,181 3,034 3,253 3,144 3,605 3,532 3,908 Non-interest expense 8,579 8,176 8,216 8,496 8,398 8,730 9,040 9,004 Income before taxes 6,462 6,774 7,021 7,585 7,270 7,575 7,468 7,947 Income taxes 956 1,040 1,088 1,222 1,114 1,180 1,180 1,261 Net income $ 5,506 $ 5,734 $ 5,933 $ 6,363 $ 6,156 $ 6,395 $ 6,288 $ 6,686 Basic earnings per share $ 0.51 $ 0.53 $ 0.55 $ 0.59 $ 0.57 $ 0.59 $ 0.58 $ 0.62 Diluted earnings per share $ 0.51 $ 0.53 $ 0.55 $ 0.58 $ 0.57 $ 0.59 $ 0.58 $ 0.60 Other comprehensive income (loss), net of tax Net unrealized gain (loss) on securities available for sale $ (3,309 ) $ (1,035 ) $ (1,888 ) $ 4,082 $ 3,512 $ 4,289 $ 936 $ (29 ) Net unrealized gain (loss) on securities transfered from available for sale to held to maturity (8 ) (7 ) (5 ) (3 ) 3 4 1 7 Net unrealized gain (loss) on cash flow hedging derivative instruments 384 138 216 (844 ) (465 ) (898 ) (340 ) 362 Unrecognized gain (loss) on postretirement benefit costs — — — 184 — — — (13 ) Other comprehensive income (loss) $ (2,933 ) $ (904 ) $ (1,677 ) $ 3,419 $ 3,050 $ 3,395 $ 597 $ 327 Comprehensive income $ 2,573 $ 4,830 $ 4,256 $ 9,782 $ 9,206 $ 9,790 $ 6,885 $ 7,013

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2019
Accounting Policies [Abstract]
Principles of Consolidation	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	Subsequent Events Events occurring subsequent to December 31, 2019 have been evaluated as to their potential impact on the financial statements.
Use of Estimates in Preparation of 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 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	Derivative Financial Instruments Designated as Hedges The Bank recognizes all derivatives in the consolidated balance sheets at fair value. On the date the Bank enters into the derivative contract, the Bank 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 Bank 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 Bank 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 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 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 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	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 troubled debt 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 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	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 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)	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 2019 , 2018 and 2017 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, 2019 , the Company determined goodwill and other intangible assets were not impaired.
Income Taxes	Income Taxes
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 gains and losses on securities transferred from available for sale to held to maturity, net of amortization, change in unrealized gain and losses 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	Financial Derivative Instruments The Bank uses derivative financial instruments for risk management purposes and not for trading or speculative purposes. As part of its overall asset and liability management strategy, the Bank periodically uses derivative instruments to minimize significant unplanned fluctuations in earnings and cash flows caused by interest rate volatility. The Bank’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 Bank recognizes its derivative instruments in the consolidated balance sheet at fair value. On the date the derivative instrument is entered into, the Bank designates whether the derivative is part of a hedging relationship (i.e., cash flow or fair value hedge). The Bank formally documents relationships between hedging instruments and hedged items, as well as its risk management objective and strategy for undertaking hedge transactions. The Bank 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 Bank 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.
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 – 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.
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, 2019 and 2018 , 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. Customer Loan Derivatives The valuation of the Company’s customer loan derivatives is obtained from a third-party pricing service and is determined using a discounted cash flow analysis on the expected cash flows of each derivative. The pricing analysis is based on observable inputs for the contractual terms of the derivatives, including the period to maturity and interest rate curves. The Company incorporates credit valuation adjustments to appropriately reflect both its own nonperformance risk and the respective counterparty’s nonperformance risk in the fair value measurements. In adjusting the fair value of its derivative contracts for the effect of nonperformance risk, the Company has considered the impact of master netting arrangements and any applicable credit enhancements, such as 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.
Reclassifications	Reclassifications Certain items from prior years were reclassified in the financial statements to conform with the current year presentation. These do not have a material impact on the balance sheet or statement of income presentations.
New Accounting Pronouncements	New Accounting Pronouncements The FASB issued 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. Adoption of ASU No. 2014-09 was made on January 1, 2018 utilizing the modified retrospective approach. The adoption of the ASU did not have a material effect on the Company's consolidated financial statements. 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. The adoption of the ASU did not 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 was to be effective for all SEC registrants for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years. On October 16, 2019 FASB voted to finalize a proposal issued in August 2019 under which the effective implementation date was changed for SEC registrants meeting the definition of a Smaller Reporting Company to fiscal years beginning after December 15, 2022. Early adoption is permitted for fiscal years beginning after December 15, 2018, including interim periods within such years. The Company qualifies as a Smaller Reporting Company. It continues to evaluate the impact of the adoption of the ASU on its consolidated financial statements, and continues to anticipates that it may have a material impact upon adoption. 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, identified 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. The Bank is in the late stages of implementing this software and plans to run incurred loss and current expected credit models in parallel until adoption of ASU No. 2016-13. 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 there was 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. The adoption of this ASU did not 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 did 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 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 . This ASU makes minor changes to the disclosure requirements for employers that sponsor defined benefit pension and/or other postretirement benefit plans. ASU 2018-14 is effective for fiscal years ending after December 15, 2020; early adoption is permitted. As ASU 2018-14 only revises disclosure requirements, it will not have a material impact on the Company’s consolidated financial statements. In April 2019, the FASB issued ASU No. 2019–04, Codification Improvements to Topic 326, Financial Instruments – Credit Losses, Topic 815, Derivatives and Hedging, and Topic 825, Financial Instruments. With respect to Topic 815, Derivatives and Hedging, ASU 2019-04 clarifies that the reclassification of a debt security from held to maturity (“HTM”) to available for sale (“AFS”) under the transition guidance in ASU 2017-12 would not (1) call into question the classification of other HTM securities, (2) be required to actually designate any reclassified security in a last-of-layer hedge, or (3) be restricted from selling any reclassified security. As part of the transition of ASU 2019-04, entities may reclassify securities that would qualify for designation as the hedged item in a last-of-layer hedging relationship from HTM to AFS; however, entities that already made such a

Investment Securities (Tables)

Investment Securities (Tables)	12 Months Ended
	Dec. 31, 2019
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, 2019 and 2018 : Amortized Unrealized Unrealized Fair Value As of December 31, 2019 Cost Gains Losses (Estimated) Securities available for sale U.S. government-sponsored agencies $ 7,500,000 $ — $ (102,000 ) $ 7,398,000 Mortgage-backed securities 323,277,000 4,173,000 (833,000) 326,617,000 State and political subdivisions 25,113,000 1,392,000 — 26,505,000 $ 355,890,000 $ 5,565,000 $ (935,000 ) $ 360,520,000 Securities to be held to maturity U.S. Government-sponsored agencies $ 32,840,000 $ 47,000 $ (26,000 ) $ 32,861,000 Mortgage-backed securities 14,431,000 450,000 (16,000 ) 14,865,000 State and political subdivisions 219,585,000 4,936,000 (109,000 ) 224,412,000 Corporate securities 14,750,000 157,000 — 14,907,000 $ 281,606,000 $ 5,590,000 $ (151,000 ) $ 287,045,000 Restricted equity securities Federal Home Loan Bank Stock $ 7,945,000 $ — $ — $ 7,945,000 Federal Reserve Bank Stock 1,037,000 — — 1,037,000 $ 8,982,000 $ — $ — $ 8,982,000 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
Contractual Maturities of Investment Securities	The following table summarizes the contractual maturities of investment securities at December 31, 2019 : 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 $ 127,000 $ 127,000 $ 1,334,000 $ 1,338,000 Due in 1 to 5 years 36,534,000 36,778,000 25,860,000 26,323,000 Due in 5 to 10 years 93,134,000 95,014,000 179,133,000 182,834,000 Due after 10 years 226,095,000 228,601,000 75,279,000 76,550,000 $ 355,890,000 $ 360,520,000 $ 281,606,000 $ 287,045,000 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
Schedule of Securities Gains and Losses	The following table shows securities gains and losses for 2019 , 2018 and 2017 : 2019 2018 2017 Proceeds from sales of securities $ 9,229,000 $ 459,000 $ 15,587,000 Gross realized gains 224,000 137,000 471,000 Gross realized losses — — — Net gain $ 224,000 $ 137,000 $ 471,000 Related income taxes $ 47,000 $ 29,000 $ 165,000
Schedule of Temporary Impairment Losses	Information regarding securities temporarily impaired as of December 31, 2019 is summarized below: Less than 12 months 12 months or more Total Fair Unrealized Fair Unrealized Fair Unrealized As of December 31, 2019 Value Losses Value Losses Value Losses U.S. Government-sponsored agencies $ 12,372,000 $ (128,000 ) $ — $ — $ 12,372,000 $ (128,000 ) Mortgage-backed securities 54,244,000 (359,000 ) 18,696,000 (490,000 ) 72,940,000 (849,000 ) State and political subdivisions 10,532,000 (101,000 ) 304,000 (8,000 ) 10,836,000 (109,000 ) $ 77,148,000 $ (588,000 ) $ 19,000,000 $ (498,000 ) $ 96,148,000 $ (1,086,000 ) 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. 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 )

Mortgage Servicing Rights (Tabl

Mortgage Servicing Rights (Tables)	12 Months Ended
	Dec. 31, 2019
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, 2019 2018 Mortgage servicing rights $ 6,140,000 $ 5,718,000 Accumulated amortization (4,594,000 ) (4,364,000 ) $ 1,546,000 $ 1,354,000

Loans (Tables)

Loans (Tables)	12 Months Ended
	Dec. 31, 2019
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, 2019 and 2018 : December 31, 2019 December 31, 2018 Commercial Real estate $ 372,810,000 28.7 % $ 353,243,000 28.5 % Construction 38,084,000 3.0 % 27,304,000 2.2 % Other 218,773,000 16.9 % 196,391,000 15.9 % Municipal 41,288,000 3.2 % 51,128,000 4.1 % Residential Term 492,455,000 37.9 % 469,145,000 37.9 % Construction 14,813,000 1.2 % 17,743,000 1.4 % Home equity line of credit 92,349,000 7.1 % 98,469,000 8.0 % Consumer 26,503,000 2.0 % 24,860,000 2.0 % Total loans $ 1,297,075,000 100.0 % $ 1,238,283,000 100.0 %
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, 2019 2018 Balance at beginning of year $ 22,149,000 $ 22,354,000 New loans 521,000 1,341,000 Repayments (1,536,000 ) (1,192,000 ) Retired director — (354,000 ) Balance at end of year $ 21,134,000 $ 22,149,000
Past Due Loans Aging	Information on the past-due status of loans as of December 31, 2019 , 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 $ 786,000 $ 377,000 $ 611,000 $ 1,774,000 $ 371,036,000 $ 372,810,000 $ — Construction — 14,000 257,000 271,000 37,813,000 38,084,000 — Other 2,764,000 465,000 1,799,000 5,028,000 213,745,000 218,773,000 1,464,000 Municipal — — — — 41,288,000 41,288,000 — Residential Term 1,129,000 1,132,000 2,379,000 4,640,000 487,815,000 492,455,000 86,000 Construction — — — — 14,813,000 14,813,000 — Home equity line of credit 1,169,000 58,000 1,730,000 2,957,000 89,392,000 92,349,000 — Consumer 291,000 46,000 10,000 347,000 26,156,000 26,503,000 10,000 Total $ 6,139,000 $ 2,092,000 $ 6,786,000 $ 15,017,000 $ 1,282,058,000 $ 1,297,075,000 $ 1,560,000 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
Nonaccrual Loans	Information on nonaccrual loans as of December 31, 2019 and 2018 is presented in the following table: As of December 31, 2019 2018 Commercial Real estate $ 1,784,000 $ 1,226,000 Construction 256,000 — Other 6,534,000 8,664,000 Municipal — — Residential Term 5,899,000 4,062,000 Construction — — Home equity line of credit 2,171,000 760,000 Consumer 5,000 15,000 Total $ 16,649,000 $ 14,727,000
Impaired Loans	Information regarding impaired loans is as follows: For the years ended December 31, 2019 2018 2017 Average investment in impaired loans $ 31,557,000 $ 31,805,000 $ 29,108,000 Interest income recognized on impaired loans, all on cash basis 735,000 864,000 784,000 As of December 31, 2019 2018 Balance of impaired loans $ 29,274,000 $ 31,751,000 Less portion for which no allowance for loan losses is allocated (18,212,000 ) (21,030,000 ) Portion of impaired loan balance for which an allowance for loan losses is allocated $ 11,062,000 $ 10,721,000 Portion of allowance for loan losses allocated to the impaired loan balance $ 2,213,000 $ 2,308,000
Impaired Loans by class of financing receivable	A breakdown of impaired loans by category as of December 31, 2019 , 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 $ 5,235,000 $ 5,492,000 $ — $ 7,611,000 $ 228,000 Construction 958,000 970,000 — 936,000 47,000 Other 756,000 786,000 — 965,000 29,000 Municipal — — — — — Residential Term 10,176,000 11,931,000 — 10,033,000 269,000 Construction — — — — — Home equity line of credit 1,087,000 1,151,000 — 997,000 20,000 Consumer — — — — — $ 18,212,000 $ 20,330,000 $ — $ 20,542,000 $ 593,000 With an Allowance Recorded Commercial Real estate $ 1,074,000 $ 1,093,000 $ 251,000 $ 1,528,000 $ 60,000 Construction — — — — — Other 6,319,000 6,925,000 1,273,000 6,778,000 — Municipal — — — — — Residential Term 2,263,000 2,412,000 237,000 2,424,000 82,000 Construction — — — — — Home equity line of credit 1,401,000 1,412,000 447,000 283,000 — Consumer 5,000 6,000 5,000 2,000 — $ 11,062,000 $ 11,848,000 $ 2,213,000 $ 11,015,000 $ 142,000 Total Commercial Real estate $ 6,309,000 $ 6,585,000 $ 251,000 $ 9,139,000 $ 288,000 Construction 958,000 970,000 — 936,000 47,000 Other 7,075,000 7,711,000 1,273,000 7,743,000 29,000 Municipal — — — — — Residential Term 12,439,000 14,343,000 237,000 12,457,000 351,000 Construction — — — — — Home equity line of credit 2,488,000 2,563,000 447,000 1,280,000 20,000 Consumer 5,000 6,000 5,000 2,000 — $ 29,274,000 $ 32,178,000 $ 2,213,000 $ 31,557,000 $ 735,000 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, 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 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
Troubled Debt Restructurings on Financing Receivables	The following table shows TDRs by class and the specific reserve as of December 31, 2019 : Number of Loans Balance Specific Reserves Commercial Real estate 17 $ 4,836,000 $ 246,000 Construction 1 701,000 — Other 8 6,932,000 1,231,000 Municipal — — — Residential Term 52 8,472,000 200,000 Construction — — — Home equity line of credit 3 483,000 — Consumer — — — 81 $ 21,424,000 $ 1,677,000 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 As of December 31, 2019 , 13 of the loans classified as TDRs with a total balance of $1,510,000 were more than 30 days past due. Two 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, 2019 : Number of Loans Balance Specific Reserves Commercial Real estate — $ — $ — Construction — — — Other 4 371,000 131,000 Municipal — — — Residential Term 8 972,000 86,000 Construction — — — Home equity line of credit 1 167,000 — Consumer — — — 13 $ 1,510,000 $ 217,000 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 For the year ended December 31, 2019 , 11 loans were placed 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, 2019 : Number of Loans Pre-Modification Outstanding Recorded Investment Post-Modification Outstanding Recorded Investment Specific Reserves Commercial Real estate 2 $ 109,000 $ 90,000 90,000 Construction — — — — Other 1 98,000 98,000 — Municipal — — — — Residential Term 8 996,000 872,000 72,000 Construction — — — — Home equity line of credit — — — — Consumer — — — — 11 $ 1,203,000 $ 1,060,000 162,000 For the year ended December 31, 2018 , 18 loans were placed in TDR status. The following table shows these TDRs by class and the associated specific reserves included in the allowance for loan losses as for 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, 2019
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, 2019 and 2018 : As of December 31, 2019 2018 Allowance for Loans Evaluated Individually for Impairment Commercial Real estate $ 251,000 $ 260,000 Construction — — Other 1,273,000 1,696,000 Municipal — — Residential Term 237,000 335,000 Construction — — Home equity line of credit 447,000 17,000 Consumer 5,000 — Total $ 2,213,000 $ 2,308,000 Allowance for Loans Evaluated Collectively for Impairment Commercial Real estate $ 3,491,000 $ 3,307,000 Construction 365,000 255,000 Other 2,056,000 1,845,000 Municipal 27,000 24,000 Residential Term 787,000 900,000 Construction 25,000 34,000 Home equity line of credit 631,000 713,000 Consumer 862,000 630,000 Unallocated 1,182,000 1,216,000 Total $ 9,426,000 $ 8,924,000 Total Allowance for Loan Losses Commercial Real estate $ 3,742,000 $ 3,567,000 Construction 365,000 255,000 Other 3,329,000 3,541,000 Municipal 27,000 24,000 Residential Term 1,024,000 1,235,000 Construction 25,000 34,000 Home equity line of credit 1,078,000 730,000 Consumer 867,000 630,000 Unallocated 1,182,000 1,216,000 Total $ 11,639,000 $ 11,232,000
Loan losses by loan segment and allowance element	A breakdown of the allowance for loan losses as of December 31, 2019 and 2018 , by class of financing receivable and allowance element, is presented in the following tables: As of December 31, 2019 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 $ 251,000 $ 729,000 $ 2,762,000 $ — $ 3,742,000 Construction — 76,000 289,000 — 365,000 Other 1,273,000 430,000 1,626,000 — 3,329,000 Municipal — — 27,000 — 27,000 Residential Term 237,000 153,000 634,000 — 1,024,000 Construction — 5,000 20,000 — 25,000 Home equity line of credit 447,000 130,000 501,000 — 1,078,000 Consumer 5,000 460,000 402,000 — 867,000 Unallocated — — — 1,182,000 1,182,000 $ 2,213,000 $ 1,983,000 $ 6,261,000 $ 1,182,000 $ 11,639,000 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
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, 2019 : Commercial Real Estate Commercial Construction Commercial Other Municipal Loans All Risk- Rated Loans 1 Strong $ — $ — $ 4,258,000 $ 32,000 $ 4,290,000 2 Above average 12,393,000 794,000 6,187,000 38,290,000 57,664,000 3 Satisfactory 74,709,000 2,305,000 41,527,000 379,000 118,920,000 4 Average 205,510,000 19,017,000 107,389,000 2,587,000 334,503,000 5 Watch 63,582,000 15,488,000 47,152,000 — 126,222,000 6 OAEM 1,160,000 — 1,988,000 — 3,148,000 7 Substandard 15,456,000 480,000 10,272,000 — 26,208,000 8 Doubtful — — — — — Total $ 372,810,000 $ 38,084,000 $ 218,773,000 $ 41,288,000 $ 670,955,000 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, 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
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, 2019 , 2018 and 2017 : For the year ended December 31, 2019 Commercial Residential Home Equity Line of Credit Real Estate Construction Other Municipal Term Construction Consumer Unallocated Total Allowance for loan losses: Beginning 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 Chargeoffs 89,000 — 179,000 — 445,000 — 69,000 338,000 — 1,120,000 Recoveries 15,000 — 73,000 — 57,000 — 4,000 128,000 — 277,000 Provision (credit) 249,000 110,000 (106,000 ) 3,000 177,000 (9,000 ) 413,000 447,000 (34,000 ) 1,250,000 Ending balance $ 3,742,000 $ 365,000 $ 3,329,000 $ 27,000 $ 1,024,000 $ 25,000 $ 1,078,000 $ 867,000 $ 1,182,000 $ 11,639,000 Ending balance specifically evaluated for impairment $ 251,000 $ — $ 1,273,000 $ — $ 237,000 $ — $ 447,000 $ 5,000 $ — $ 2,213,000 Ending balance collectively evaluated for impairment $ 3,491,000 $ 365,000 $ 2,056,000 $ 27,000 $ 787,000 $ 25,000 $ 631,000 $ 862,000 $ 1,182,000 $ 9,426,000 Related loan balances: Ending balance $ 372,810,000 $ 38,084,000 $ 218,773,000 $ 41,288,000 $ 492,455,000 $ 14,813,000 $ 92,349,000 $ 26,503,000 $ — $ 1,297,075,000 Ending balance specifically evaluated for impairment $ 6,309,000 $ 958,000 $ 7,075,000 $ — $ 12,439,000 $ — $ 2,488,000 $ 5,000 $ — $ 29,274,000 Ending balance collectively evaluated for impairment $ 366,501,000 $ 37,126,000 $ 211,698,000 $ 41,288,000 $ 480,016,000 $ 14,813,000 $ 89,861,000 $ 26,498,000 $ — $ 1,267,801,000 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

Premises and Equipment (Tables)

Premises and Equipment (Tables)	12 Months Ended
	Dec. 31, 2019
Property, Plant and Equipment [Abstract]
Premises and Equipment	Premises and equipment are carried at cost and consist of the following: As of December 31, 2019 2018 Land $ 5,100,000 $ 4,852,000 Land improvements 1,100,000 1,105,000 Buildings 21,946,000 22,301,000 Equipment 12,858,000 12,461,000 41,004,000 40,719,000 Less accumulated depreciation 19,699,000 18,663,000 $ 21,305,000 $ 22,056,000
Schedule of Anticipated Rental Revenue	Future minimum receipts under lease agreements at December 31, 2019 for each of the next five years and in the aggregate are: 2020 $129,000 2021 129,000 2022 125,000 2023 41,000 2024 16,000 Thereafter — $440,000

Other Real Estate Owned (Tables

Other Real Estate Owned (Tables)	12 Months Ended
	Dec. 31, 2019
Real Estate Owned, Disclosure of Detailed Components [Abstract]
Other Real Estate Owned	The following summarizes other real estate owned: As of December 31, 2019 2018 Real estate acquired in settlement of loans $ 279,000 $ 584,000
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, 2019 2018 2017 Balance at beginning of year $ — $ 53,000 $ 205,000 Losses charged to allowance — (53,000 ) (169,000 ) Provision charged to operating expenses — — 17,000 Balance at end of year $ — $ — $ 53,000

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2019
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, 2019 2018 2017 Federal income tax Current $ 3,978,000 $ 4,407,000 $ 4,184,000 Deferred 336,000 (492,000 ) 2,083,000 4,314,000 3,915,000 6,267,000 State franchise tax 421,000 391,000 345,000 $ 4,735,000 $ 4,306,000 $ 6,612,000
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, 2019 2018 2017 Expected tax expense $ 6,355,000 $ 5,847,000 $ 9,170,000 Non-taxable income (1,749,000 ) (1,699,000 ) (2,625,000 ) State franchise tax, net of federal tax benefit 332,000 309,000 224,000 Equity compensation (45,000 ) (55,000 ) (83,000 ) Tax credits, net of amortization (85,000 ) (85,000 ) (88,000 ) Change in federal tax rate — — 134,000 Other (73,000 ) (11,000 ) (120,000 ) $ 4,735,000 $ 4,306,000 $ 6,612,000
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, 2019 and 2018 are as follows: 2019 2018 Allowance for loan losses $ 2,444,000 $ 2,359,000 Accrued pension and post-retirement 926,000 955,000 Unrealized loss on securities available for sale — 1,343,000 Unrealized loss on securities transferred from available for sale to held to maturity 48,000 52,000 Restricted stock grants 203,000 170,000 Core deposit intangible 21,000 18,000 Investment in flow through entities 55,000 31,000 Other assets — 24,000 Total deferred tax asset 3,697,000 4,952,000 Net deferred loan costs (1,669,000 ) (1,504,000 ) Depreciation (1,434,000 ) (1,300,000 ) Unrealized gain on securities available for sale (972,000 ) — Goodwill (120,000 ) (80,000 ) Mortgage servicing rights (325,000 ) (284,000 ) Unrealized gain on derivative instruments (26,000 ) (382,000 ) Prepaid expense (205,000 ) (159,000 ) Total deferred tax liability (4,751,000 ) (3,709,000 ) Net deferred tax asset (liability) $ (1,054,000 ) $ 1,243,000

Certificates of Deposit (Tables

Certificates of Deposit (Tables)	12 Months Ended
	Dec. 31, 2019
Banking and Thrift [Abstract]
Certificates of deposit	The following table represents the breakdown of certificates of deposit at December 31, 2019 and 2018 : December 31, 2019 December 31, 2018 Certificates of deposit < $100,000 $ 277,225,000 $ 372,464,000 Certificates $100,000 to $250,000 345,241,000 162,185,000 Certificates $250,000 and over 67,513,000 56,760,000 $ 689,979,000 $ 591,409,000
Maturities of certificates of deposit	At December 31, 2019 , 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 2020 $ 176,860,000 $ 330,371,000 $ 507,231,000 2021 21,055,000 26,236,000 47,291,000 2022 35,923,000 17,932,000 53,855,000 2023 24,687,000 33,493,000 58,180,000 2024 18,549,000 4,722,000 23,271,000 2025 and thereafter 151,000 — 151,000 $ 277,225,000 $ 412,754,000 $ 689,979,000

Borrowed Funds (Tables)

Borrowed Funds (Tables)	12 Months Ended
	Dec. 31, 2019
Borrowed Funds [Abstract]
Range of Interest Rates and Maturity Dates of Borrowed Funds	Borrowed funds at December 31, 2019 and 2018 have the following range of interest rates and maturity dates: As of December 31, 2019 Federal Home Loan Bank Advances 2020 1.60% - 1.97% $ 137,400,000 2021 1.55% 10,000,000 2022 0.00% — 2023 0.00% — 2024 0.00% 105,000 2025 and thereafter 0.00% — 147,505,000 Repurchase agreements Municipal and commercial customers 0.10% - 2.33% 37,450,000 $ 184,955,000 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

Employee Benefit Plans (Tables)

Employee Benefit Plans (Tables)	12 Months Ended
	Dec. 31, 2019
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, 2019 2018 2017 Change in benefit obligations Benefit obligation at beginning of year: $ 1,599,000 $ 1,874,000 $ 1,870,000 Interest cost 66,000 77,000 77,000 Benefits paid (97,000 ) (117,000 ) (113,000 ) Actuarial (gain) loss 13,000 (235,000 ) 40,000 Benefit obligation at end of year: $ 1,581,000 $ 1,599,000 $ 1,874,000 Funded status Benefit obligation at end of year $ (1,581,000 ) $ (1,599,000 ) $ (1,874,000 ) Unamortized (gain) loss (31,000 ) (47,000 ) 186,000 Accrued benefit cost $ (1,612,000 ) $ (1,646,000 ) $ (1,688,000 ) Weighted average discount rate as of December 31 3.00 % 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, 2019 2018 2017 Components of net periodic benefit cost Interest cost $ 66,000 $ 77,000 $ 77,000 Amortization of loss — — — Other settlement (income) expense (2,000 ) (3,000 ) 11,000 Net periodic benefit cost $ 64,000 $ 74,000 $ 88,000 Weighted average discount rate for net periodic cost 3.00 % 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, 2019 2018 Portion to Be Recognized in Income in 2020 Unamortized net actuarial gain (loss) $ 31,000 $ 47,000 $ (158,000 ) Deferred tax (expense) benefit at 21% (7,000 ) (10,000 ) 33,000 Net unrecognized post-retirement benefits included in accumulated other comprehensive income (loss) $ 24,000 $ 37,000 $ (125,000 )

Other Comprehensive Income (L_2

Other Comprehensive Income (Loss) (Tables)	12 Months Ended
	Dec. 31, 2019
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, 2019 , 2018 and 2017 . For the years ended December 31, 2019 2018 2017 Balance at beginning of year $ (5,051,000 ) $ (2,901,000 ) $ (935,000 ) Unrealized gains (losses) arising during the year 11,247,000 (2,585,000 ) (1,763,000 ) Reclassification of realized gains during the year (224,000 ) (137,000 ) (471,000 ) Related deferred taxes (2,315,000 ) 572,000 782,000 Reclassification adjustment for effect of enacted tax law changes — — (514,000 ) Net change 8,708,000 (2,150,000 ) (1,966,000 ) Balance at end of year $ 3,657,000 $ (5,051,000 ) $ (2,901,000 ) 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, 2019 , 2018 , and 2017 . For the years ended December 31, 2019 2018 2017 Balance at beginning of year $ (197,000 ) $ (174,000 ) $ (129,000 ) Amortization of net unrealized gains (losses) 19,000 (29,000 ) (22,000 ) Related deferred taxes (4,000 ) 6,000 8,000 Reclassification adjustment for effect of enacted tax law changes — — (31,000 ) Net change 15,000 (23,000 ) (45,000 ) Balance at end of year $ (182,000 ) $ (197,000 ) $ (174,000 ) 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, 2019 , 2018 , and 2017 . For the years ended December 31, 2019 2018 2017 Balance at beginning of year $ 1,438,000 $ 1,544,000 $ 1,163,000 Unrealized gains (losses) on cash flow hedging derivatives arising during the year (1,697,000 ) (134,000 ) 165,000 Related deferred taxes 356,000 28,000 (58,000 ) Reclassification adjustment for effect of enacted tax law changes — — 274,000 Net change (1,341,000 ) (106,000 ) 381,000 Balance at end of year $ 97,000 $ 1,438,000 $ 1,544,000 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, 2019 , 2018 , and 2017 : For the years ended December 31, 2019 2018 2017 Unrecognized postretirement benefits at beginning of year $ 37,000 $ (147,000 ) $ (102,000 ) Change in unamortized net actuarial gain (loss) (16,000 ) 233,000 (30,000 ) Related deferred taxes 3,000 (49,000 ) 11,000 Reclassification adjustment for effect of enacted tax law changes — — (26,000 ) Net change (13,000 ) 184,000 (45,000 ) Unrecognized postretirement benefits at end of year $ 24,000 $ 37,000 $ (147,000 )

Financial Derivative Instrume_2

Financial Derivative Instruments (Tables)	12 Months Ended
	Dec. 31, 2019
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule of Derivative Instruments	The details of the interest rate swap agreements are as follows: December 31, 2019 December 31, 2018 Effective Date Maturity Date Variable Index Received Fixed Rate Paid Presentation on Consolidated Balance Sheet Notional Amount Fair Value Notional Amount Fair Value 06/27/16 06/27/21 1-Month USD LIBOR 0.893 % Other Assets $ 20,000,000 $ 199,000 $ 20,000,000 $ 763,000 06/28/16 06/28/21 1-Month USD LIBOR 0.940 % Other Assets 30,000,000 278,000 30,000,000 1,110,000 06/05/18 12/05/19 1-Month USD LIBOR 2.466 % Other Assets — — 25,000,000 16,000 06/05/18 06/05/20 1-Month USD LIBOR 2.547 % Other Liabilities 25,000,000 (96,000 ) 25,000,000 (9,000 ) 06/05/18 12/05/20 1-Month USD LIBOR 2.603 % Other Liabilities 25,000,000 (234,000 ) 25,000,000 (60,000 ) 12/05/19 12/05/22 3-Month USD LIBOR 1.779 % Other Liabilities 25,000,000 (98,000 ) — — 08/02/19 08/02/24 1-Month USD Libor 1.590 % Other Liabilities 12,500,000 (11,000 ) — — 08/05/19 08/05/24 1-Month USD Libor 1.420 % Other Assets 12,500,000 85,000 — — $ 150,000,000 $ 123,000 $ 125,000,000 $ 1,820,000

Stock Options and Stock-Based_2

Stock Options and Stock-Based Compensation (Tables)	12 Months Ended
	Dec. 31, 2019
Share-based Payment Arrangement [Abstract]
Schedule of Nonvested Restricted Stock Units Activity	As of December 31, 2019 , 162,892 shares of restricted stock had been granted under the 2010 Plan, of which 65,039 shares remain restricted as of December 31, 2019 as detailed in the following table: Year Granted Vesting Term (In Years) Shares Remaining Term (In Years) 2015 5.0 8,904 0.2 2016 5.0 10,874 1.1 2017 3.0 4,602 0.1 2017 5.0 7,017 2.1 2018 2.0 932 0.1 2018 3.0 5,371 1.1 2018 4.0 2,068 2.0 2018 5.0 6,184 3.0 2019 1.0 1,349 0.1 2019 2.0 1,484 1.1 2019 3.0 16,254 2.1 65,039 1.3

Earnings Per Share (Tables)

Earnings Per Share (Tables)	12 Months Ended
	Dec. 31, 2019
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, 2019 , 2018 and 2017 : Income (Numerator) Shares (Denominator) Per-Share Amount For the year ended December 31, 2019 Net income as reported $ 25,525,000 Basic EPS: Income available to common shareholders 25,525,000 10,815,718 $ 2.36 Effect of dilutive securities: restricted stock 73,591 Diluted EPS: Income available to common shareholders plus assumed conversions $ 25,525,000 10,889,309 $ 2.34 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

Regulatory Capital Requiremen_2

Regulatory Capital Requirements (Tables)	12 Months Ended
	Dec. 31, 2019
Broker-Dealer, Net Capital Requirement, SEC Regulation [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, 2019 Tier 2 capital to $ 189,421,000 $ 99,756,000 $ 124,695,000 risk-weighted assets 15.19 % 8.00 % 10.00 % Tier 1 capital to $ 177,682,000 $ 74,817,000 $ 99,756,000 risk-weighted assets 14.25 % 6.00 % 8.00 % Common equity Tier 1 capital to $ 177,682,000 $ 56,113,000 $ 81,052,000 risk-weighted assets 14.25 % 4.50 % 6.50 % Tier 1 capital to $ 177,682,000 $ 80,385,000 $ 100,481,000 average assets 8.84 % 4.00 % 5.00 % 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 % 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, 2019 Tier 2 capital to $ 190,412,000 $ 99,756,000 n/a risk-weighted assets 15.27 % 8.00 % n/a Tier 1 capital to $ 178,773,000 $ 74,817,000 n/a risk-weighted assets 14.34 % 6.00 % n/a Common equity Tier 1 capital to $ 178,773,000 $ 56,113,000 n/a risk-weighted assets 14.34 % 4.50 % n/a Tier 1 capital to $ 178,773,000 $ 80,527,000 n/a average assets 8.88 % 4.00 % n/a 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

Off-Balance-Sheet Financial I_2

Off-Balance-Sheet Financial Instruments and Concentrations of Credit Risk (Tables)	12 Months Ended
	Dec. 31, 2019
Commitments and Contingencies Disclosure [Abstract]
Off-Balance-Sheet Financial instruments	At December 31, 2019 and 2018 , the Bank had the following off-balance-sheet financial instruments, whose contract amounts represent credit risk: As of December 31, 2019 2018 Unused lines, collateralized by residential real estate $ 81,193,000 $ 83,421,000 Other unused commitments 90,186,000 60,033,000 Standby letters of credit 4,496,000 3,590,000 Commitments to extend credit 19,702,000 19,268,000 Total $ 195,577,000 $ 166,312,000

Fair Value Disclosures (Tables)

Fair Value Disclosures (Tables)	12 Months Ended
	Dec. 31, 2019
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, 2019 and 2018 . At December 31, 2019 Level 1 Level 2 Level 3 Total Securities available for sale U.S. Government-sponsored agencies $ — $ 7,398,000 $ — $ 7,398,000 Mortgage-backed securities — 326,617,000 — 326,617,000 State and political subdivisions — 26,505,000 — 26,505,000 Total securities available for sale — 360,520,000 — 360,520,000 Interest rate swap agreements — 562,000 — 562,000 Customer loan interest swap agreements — 1,205,000 — 1,205,000 Total interest rate swap agreements — 1,767,000 — 1,767,000 Total assets $ — $ 362,287,000 $ — $ 362,287,000 At December 31, 2019 Level 1 Level 2 Level 3 Total Interest rate swap agreements $ — $ 439,000 $ — $ 439,000 Customer loan interest swap agreements — 1,205,000 — 1,205,000 Total liabilities $ — $ 1,644,000 $ — $ 1,644,000 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 — 1,889,000 — 1,889,000 Total assets $ — $ 319,305,000 $ — $ 319,305,000 At December 31, 2018 Level 1 Level 2 Level 3 Total Interest rate swap agreements $ — $ 69,000 $ — $ 69,000 Total liabilities $ — $ 69,000 $ — $ 69,000
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 at December 31, 2019 and 2018 . 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 $1,916,000 and $2,096,000 at December 31, 2019 and 2018 , respectively. At December 31, 2019 Level 1 Level 2 Level 3 Total Other real estate owned $ — $ 279,000 $ — $ 279,000 Impaired loans — 6,579,000 — 6,579,000 Total assets $ — $ 6,858,000 $ — $ 6,858,000 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
Estimated fair value of financial instruments	The carrying amounts and estimated fair values for financial instruments as of December 31, 2019 were as follows: Carrying Estimated As of December 31, 2019 value fair value Level 1 Level 2 Level 3 Financial assets Securities to be held to maturity $281,606,000 $287,045,000 $ — $287,045,000 $ — Loans (net of allowance for loan losses) Commercial Real estate 368,645,000 364,626,000 — 2,000 364,624,000 Construction 37,678,000 37,366,000 — — 37,366,000 Other 215,068,000 212,548,000 — 5,046,000 207,502,000 Municipal 41,258,000 40,552,000 — — 40,552,000 Residential Term 491,315,000 491,359,000 — 577,000 490,782,000 Construction 14,785,000 14,786,000 — — 14,786,000 Home equity line of credit 91,149,000 90,959,000 — 954,000 90,005,000 Consumer 25,538,000 23,489,000 — — 23,489,000 Total loans 1,285,436,000 1,275,685,000 — 6,579,000 1,269,106,000 Mortgage servicing rights 1,546,000 2,089,000 — 2,089,000 — Financial liabilities Local certificates of deposit $285,602,000 $281,480,000 — $281,480,000 — National certificates of deposit 404,377,000 412,337,000 — 412,337,000 — Total certificates of deposit deposits 689,979,000 693,817,000 — 693,817,000 — Repurchase agreements 37,450,000 37,450,000 — 37,450,000 — Federal Home Loan Bank advances 147,505,000 140,063,000 — 140,063,000 — Total borrowed funds 184,955,000 177,513,000 — 177,513,000 — 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 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 —

Other Operating Income and Ex_2

Other Operating Income and Expense (Tables)	12 Months Ended
	Dec. 31, 2019
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, 2019 2018 2017 Other operating income ATM and debit card income $ 3,956,000 $ 3,556,000 $ 3,378,000 Other operating expense Advertising and marketing expense $ 1,174,000 $ 1,165,000 $ 1,208,000 Accounting and auditing expenses 828,000 837,000 818,000 ATM and interchange expense 1,176,000 995,000 886,000

Condensed Financial Informati_2

Condensed Financial Information of Parent (Tables)	12 Months Ended
	Dec. 31, 2019
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, 2019 2018 Assets Cash and cash equivalents $ 1,028,000 $ 1,190,000 Dividends receivable 3,200,000 2,950,000 Investment in subsidiary 183,654,000 162,763,000 Premises and equipment — 2,000 Goodwill 27,559,000 27,559,000 Other assets 337,000 232,000 Total assets $ 215,778,000 $ 194,696,000 Liabilities and shareholders' equity Dividends payable $ 3,270,000 $ 3,150,000 Other liabilities — 4,000 Total liabilities 3,270,000 3,154,000 Shareholders' equity Common stock 109,000 109,000 Additional paid-in capital 63,964,000 62,746,000 Retained earnings 148,435,000 128,687,000 Total shareholders' equity 212,508,000 191,542,000 Total liabilities and shareholders' equity $ 215,778,000 $ 194,696,000 Statements of Income For the years ended December 31, 2019 2018 2017 Interest and dividends on investments $ — $ — $ 15,000 Net securities gains (losses) — 137,000 (3,000 ) Total income — 137,000 12,000 Occupancy expense 1,000 2,000 5,000 Other operating expense 826,000 652,000 588,000 Total expense 827,000 654,000 593,000 Loss before income taxes and Bank earnings (827,000 ) (517,000 ) (581,000 ) Applicable income taxes (230,000 ) (164,000 ) (187,000 ) Loss before Bank earnings (597,000 ) (353,000 ) (394,000 ) Equity in earnings of Bank Remitted 12,600,000 11,300,000 11,180,000 Unremitted 13,522,000 12,589,000 8,802,000 Net income $ 25,525,000 $ 23,536,000 $ 19,588,000 Statements of Cash Flows For the years ended December 31, 2019 2018 2017 Cash flows from operating activities: Net income $ 25,525,000 $ 23,536,000 $ 19,588,000 Adjustments to reconcile net income to net cash provided by operating activities: Depreciation 2,000 — 5,000 Equity compensation expense 565,000 381,000 392,000 (Gain) loss on sale of investments — (137,000 ) 3,000 (Increase) decrease in other assets (105,000 ) 81,000 27,000 (Increase) decrease in dividends receivable (250,000 ) (450,000 ) 1,300,000 Increase (decrease) in dividends payable 120,000 551,000 (1,179,000 ) Decrease in other liabilities (4,000 ) — (3,000 ) Unremitted earnings of Bank (13,522,000 ) (12,589,000 ) (8,802,000 ) Net cash provided by operating activities 12,331,000 11,373,000 11,331,000 Cash flows from investing activities: Proceeds from sales/maturities of investments — 459,000 — Capital expenditures — 1,000 (4,000 ) Net cash provided by (used in) investing activities — 460,000 (4,000 ) Cash flows from financing activities: Purchase of common stock (183,000 ) (168,000 ) (154,000 ) Proceeds from sale of common stock 653,000 619,000 632,000 Dividends paid (12,963,000 ) (12,052,000 ) (11,460,000 ) Net cash used in financing activities (12,493,000 ) (11,601,000 ) (10,982,000 ) Net increase (decrease) in cash and cash equivalents (162,000 ) 232,000 345,000 Cash and cash equivalents at beginning of year 1,190,000 958,000 613,000 Cash and cash equivalents at end of year $ 1,028,000 $ 1,190,000 $ 958,000

Quarterly Information (Tables)

Quarterly Information (Tables)	12 Months Ended
	Dec. 31, 2019
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 2018Q1 2018Q2 2018Q3 2018Q4 2019Q1 2019Q2 2019Q3 2019Q4 Balance Sheets Cash and cash equivalents $ 16,559 $ 21,056 $ 21,649 $ 19,134 $ 15,270 $ 16,918 $ 21,418 $ 14,433 Interest-bearing deposits in other banks 280 1,616 51,045 12,079 231 917 16,714 11,310 Investments 562,459 565,125 562,839 573,079 606,495 625,097 625,584 642,126 Restricted equity securities 11,947 12,363 11,586 11,586 8,982 8,982 8,982 8,982 Net loans and loans held for sale 1,177,329 1,213,449 1,233,010 1,227,051 1,253,585 1,237,661 1,252,546 1,285,590 Other assets 103,241 100,352 101,725 101,641 106,782 109,124 107,983 106,355 Total assets $ 1,871,815 $ 1,913,961 $ 1,981,854 $ 1,944,570 $ 1,991,345 $ 1,998,699 $ 2,033,227 $ 2,068,796 Deposits $ 1,428,192 $ 1,416,646 $ 1,514,911 $ 1,527,085 $ 1,606,875 $ 1,592,956 $ 1,623,290 $ 1,650,466 Borrowed funds 244,229 297,455 265,274 210,317 170,419 181,858 181,417 184,955 Other liabilities 18,022 16,556 17,008 15,626 16,264 19,292 20,031 20,867 Shareholders' equity 181,372 183,304 184,661 191,542 197,787 204,593 208,489 212,508 Total liabilities & equity $ 1,871,815 $ 1,913,961 $ 1,981,854 $ 1,944,570 $ 1,991,345 $ 1,998,699 $ 2,033,227 $ 2,068,796 Income and Comprehensive Income Statements Interest income $ 16,451 $ 17,205 $ 18,086 $ 18,801 $ 19,268 $ 19,822 $ 19,904 $ 19,657 Interest expense 4,042 4,936 5,550 5,806 6,369 6,872 6,678 6,239 Net interest income 12,409 12,269 12,536 12,995 12,899 12,950 13,226 13,418 Provision for loan losses 500 500 333 167 375 250 250 375 Net interest income after provision for loan losses 11,909 11,769 12,203 12,828 12,524 12,700 12,976 13,043 Non-interest income 3,132 3,181 3,034 3,253 3,144 3,605 3,532 3,908 Non-interest expense 8,579 8,176 8,216 8,496 8,398 8,730 9,040 9,004 Income before taxes 6,462 6,774 7,021 7,585 7,270 7,575 7,468 7,947 Income taxes 956 1,040 1,088 1,222 1,114 1,180 1,180 1,261 Net income $ 5,506 $ 5,734 $ 5,933 $ 6,363 $ 6,156 $ 6,395 $ 6,288 $ 6,686 Basic earnings per share $ 0.51 $ 0.53 $ 0.55 $ 0.59 $ 0.57 $ 0.59 $ 0.58 $ 0.62 Diluted earnings per share $ 0.51 $ 0.53 $ 0.55 $ 0.58 $ 0.57 $ 0.59 $ 0.58 $ 0.60 Other comprehensive income (loss), net of tax Net unrealized gain (loss) on securities available for sale $ (3,309 ) $ (1,035 ) $ (1,888 ) $ 4,082 $ 3,512 $ 4,289 $ 936 $ (29 ) Net unrealized gain (loss) on securities transfered from available for sale to held to maturity (8 ) (7 ) (5 ) (3 ) 3 4 1 7 Net unrealized gain (loss) on cash flow hedging derivative instruments 384 138 216 (844 ) (465 ) (898 ) (340 ) 362 Unrecognized gain (loss) on postretirement benefit costs — — — 184 — — — (13 ) Other comprehensive income (loss) $ (2,933 ) $ (904 ) $ (1,677 ) $ 3,419 $ 3,050 $ 3,395 $ 597 $ 327 Comprehensive income $ 2,573 $ 4,830 $ 4,256 $ 9,782 $ 9,206 $ 9,790 $ 6,885 $ 7,013

Summary of Significant Accoun_3

Summary of Significant Accounting Policies (Details) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2017USD ($)	Dec. 31, 2019USD ($)segment	Dec. 31, 2018USD ($)	Dec. 31, 2017USD ($)
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, 2019USD ($)
Cash and Cash Equivalents [Abstract]
Contractual clearing balance	$ 500
Cash held in Reserve at Federal Reserve Bank	$ 3,147

Investment Securities Summary o

Investment Securities Summary of Amortized Cost and Estimated Fair Value (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 355,890	$ 323,809
Unrealized Gains	5,565	578
Unrealized Losses	(935)	(6,971)
Fair Value (Estimated)	360,520	317,416
Securities to be held to maturity, cost and FMV [Abstract]
Amortized Cost	281,606	255,663
Unrealized Gains	5,590	1,382
Unrealized Losses	(151)	(6,145)
Fair Value (Estimated)	287,045	250,900
Restricted equity securities
Federal Home Loan Bank Stock	7,945	10,549
Federal Reserve Bank Stock	1,037	1,037
Restricted equity securities	8,982	11,586
U.S. Government-sponsored agencies
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	7,500	5,000
Unrealized Gains	0	7
Unrealized Losses	(102)	0
Fair Value (Estimated)	7,398	5,007
Securities to be held to maturity, cost and FMV [Abstract]
Amortized Cost	32,840	11,155
Unrealized Gains	47	0
Unrealized Losses	(26)	(472)
Fair Value (Estimated)	32,861	10,683
Mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	323,277	313,854
Unrealized Gains	4,173	571
Unrealized Losses	(833)	(6,732)
Fair Value (Estimated)	326,617	307,693
Securities to be held to maturity, cost and FMV [Abstract]
Amortized Cost	14,431	18,250
Unrealized Gains	450	336
Unrealized Losses	(16)	(255)
Fair Value (Estimated)	14,865	18,331
State and political subdivisions
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	25,113	4,955
Unrealized Gains	1,392	0
Unrealized Losses	0	(239)
Fair Value (Estimated)	26,505	4,716
Securities to be held to maturity, cost and FMV [Abstract]
Amortized Cost	219,585	221,958
Unrealized Gains	4,936	1,046
Unrealized Losses	(109)	(5,418)
Fair Value (Estimated)	224,412	217,586
Corporate securities
Securities to be held to maturity, cost and FMV [Abstract]
Amortized Cost	14,750	4,300
Unrealized Gains	157	0
Unrealized Losses	0	0
Fair Value (Estimated)	$ 14,907	$ 4,300

Investment Securities Summary_2

Investment Securities Summary of Contractual Maturities (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Available-for-sale Securities, Debt Maturities [Abstract]
Amortized Cost, Due in 1 year or less	$ 127	$ 0
Fair Value (Estimated), Due in 1 year or less	127	0
Amortized Cost, Due in 1 to 5 years	36,534	13,501
Fair Value (Estimated), Due in 1 to 5 years	36,778	13,518
Amortized Cost, Due in 5 to 10 years	93,134	83,954
Fair Value (Estimated), Due in 1 to 5 years	95,014	83,326
Amortized Cost, Due after 10 years	226,095	226,354
Fair Value (Estimated), Due after 10 years	228,601	220,572
Securities available-for-sale, Amortized Cost	355,890
Fair Value (Estimated)	360,520
Amortized Cost	355,890	323,809
Fair Value (Estimated)	360,520	317,416
Debt Securities, Held-to-maturity, Maturity [Abstract]
Amortized Cost, Due in 1 year or less	1,334	1,432
Fair Value (Estimated), Due in 1 year or less	1,338	1,433
Amortized Cost, Due in 1 to 5 years	25,860	20,717
Fair Value (Estimated), Due in 1 to 5 years	26,323	20,778
Amortized Cost, Due in 5 to 10 years	179,133	157,544
Fair Value (Estimated), Due in 1 to 5 years	182,834	155,313
Amortized Cost, Due after 10 years	75,279	75,970
Fair Value (Estimated), Due after 10 years	76,550	73,376
Amortized Cost	281,606	255,663
Fair Value (Estimated)	$ 287,045	$ 250,900

Investment Securities Narrative

Investment Securities Narrative (Details)	1 Months Ended	12 Months Ended
	Dec. 31, 2019USD ($)securitystate	Dec. 31, 2019USD ($)securitystate	Dec. 31, 2018USD ($)security	Dec. 31, 2017USD ($)	Sep. 30, 2014USD ($)
Debt Securities, Available-for-sale [Line Items]
Number of securities temporarily impaired (security) | security	86	86	511
Number of securities temporarily impaired for 12 months or more (security) | security	28	28	232
Period of temporary impairment		12 months	12 months
Amortized cost of securities transferred	$ 24,900,000	$ 24,900,000			$ 89,780,000
Fair value of securities transferred					89,757,000
Net unrealized gains (losses) on securities transferred	1,600,000	1,600,000			$ (15,000)
Proceeds from sales of securities available for sale	4,300,000	8,339,000	$ 459,000	$ 15,587,000
Gain on sale of securities	209,000	224,000
Net unrealized loss on securities transferred from available for sale to held to maturity	$ 182,000	$ 182,000	197,000
Number of states | state	6	6
Federal Home Loan Bank Stock	$ 7,945,000	$ 7,945,000	10,549,000
Impairment losses	0	0
Other equity securities
Debt Securities, Available-for-sale [Line Items]
Securities pledged as collateral	$ 214,173,000	$ 214,173,000	$ 222,829,000

Investment Securities Securitie

Investment Securities Securities Gains and Losses (Details) - USD ($) $ in Thousands	1 Months Ended	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Investments, Debt and Equity Securities [Abstract]
Proceeds from Sale and Maturity of Marketable Securities		$ 9,229
Proceeds from sales of securities available for sale	$ 4,300	8,339	$ 459	$ 15,587
Gross realized gains		224
Gross realized gains			137	471
Gross realized losses		0
Gross realized losses			0	0
Net gain	$ 209	224
Net gain		224	137	471
Related income taxes		$ 47	$ 29	$ 165

Investment Securities Securit_2

Investment Securities Securities Temporarily Impaired (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, Fair Value	$ 77,148	$ 152,859
Less than 12 months, Unrealized Losses	(588)	(2,845)
12 months or more, Fair Value	19,000	240,871
12 months or more, Unrealized Losses	(498)	(10,271)
Fair Value	96,148	393,730
Unrealized Losses	(1,086)	(13,116)
U.S. Government-sponsored agencies
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, Fair Value	12,372	0
Less than 12 months, Unrealized Losses	(128)	0
12 months or more, Fair Value	0	10,683
12 months or more, Unrealized Losses	0	(472)
Fair Value	12,372	10,683
Unrealized Losses	(128)	(472)
Mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, Fair Value	54,244	76,050
Less than 12 months, Unrealized Losses	(359)	(1,061)
12 months or more, Fair Value	18,696	185,136
12 months or more, Unrealized Losses	(490)	(5,926)
Fair Value	72,940	261,186
Unrealized Losses	(849)	(6,987)
State and political subdivisions
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, Fair Value	10,532	76,809
Less than 12 months, Unrealized Losses	(101)	(1,784)
12 months or more, Fair Value	304	45,052
12 months or more, Unrealized Losses	(8)	(3,873)
Fair Value	10,836	121,861
Unrealized Losses	$ (109)	$ (5,657)

Mortgage Servicing Rights (Deta

Mortgage Servicing Rights (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Transfers and Servicing [Abstract]
Outstanding principal balance of loans serviced for others	$ 266,173	$ 261,654
Net gain from sale of loans	651	490	$ 737
Mortgage servicing rights capitalized	422	291
Amortization of mortgage servicing rights	231	204
Fair value of mortgage servicing rights	$ 2,089	2,586
Moving average of weekly prepayment data (in months)	3 months
Anticipated loan prepayment rate of servicing assets (in hundredths)	13.20%
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	$ 6,140	5,718
Accumulated amortization	(4,594)	(4,364)
Mortgage servicing rights, net	$ 1,546	$ 1,354

Loans Portfolio (Details)

Loans Portfolio (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 1,297,075	$ 1,238,283	$ 1,164,139
Percentage of loans receivable	100.00%	100.00%
Commercial | Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 372,810	$ 353,243	323,809
Percentage of loans receivable	28.70%	28.50%
Commercial | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 38,084	$ 27,304	38,056
Percentage of loans receivable	3.00%	2.20%
Commercial | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 218,773	$ 196,391	181,528
Percentage of loans receivable	16.90%	15.90%
Municipal
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 41,288	$ 51,128	33,391
Percentage of loans receivable	3.20%	4.10%
Residential | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 14,813	$ 17,743	17,868
Percentage of loans receivable	1.20%	1.40%
Residential | Term
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 492,455	$ 469,145	432,661
Percentage of loans receivable	37.90%	37.90%
Home Equity LIne of Credit
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 92,349	$ 98,469	111,302
Percentage of loans receivable	7.10%	8.00%
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 26,503	$ 24,860	$ 25,524
Percentage of loans receivable	2.00%	2.00%

Loans Narrative (Details)

Loans Narrative (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019USD ($)loan	Dec. 31, 2018USD ($)loan	Dec. 31, 2017USD ($)
Schedule of Financing Receivables [Line Items]
Net deferred loan costs included in loan balances	$ 7,419	$ 6,615
Loans used to collateralize borrowings from the Federal Home Loan Bank of Boston	296,871	290,138
Commercial, construction and home equity loans used to collateralize unused line of credit at the Federal Reserve Bank of Boston	240,133	237,152
Nonaccrual loans	16,649	14,727
Interest income which would have been recognized on these loans, if interest had been accrued	906	811	$ 496
90 Plus Days And Accruing	1,560	351
Loans to directors, officers and employees	$ 35,071	$ 34,566
Number of loans | loan	81	76
TDR recorded investment	$ 21,424	$ 25,222
Number of loans | loan	13	9
TDR recorded investment more than 30 days past due	$ 1,510	$ 1,013
Number of loans placed on TDR status in previous 12 months | loan	2	0
Number of loans | loan	11	18
Loans classified as TDRs that are involved in bankruptcy	$ 987
Number of loans classified as TDRs that were on non-accrual status | loan	26
Loans classified as TDRs that were on non-accrual status	$ 8,799
Number of loans classified as TDRs that are involved in foreclosure | loan	2
Loans classified as TDRs that are involved in foreclosure	$ 350
Number of mortgage loans in the process of foreclosure | loan	14	11
Mortgage loans in the process of foreclosure	$ 1,502	$ 1,131
Loans Receivable in Bankruptcy
Schedule of Financing Receivables [Line Items]
Number of loans | loan	9

Loans Summary of Loans to Direc

Loans Summary of Loans to Directors and Executive Officers (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Loans and Leases Receivable, Related Parties [Roll Forward]
Beginning balance	$ 22,149	$ 22,354
New loans	521	1,341
Repayments	(1,536)	(1,192)
Retired director	0	(354)
Ending balance	$ 21,134	$ 22,149

Loans Past-due Status of Loans

Loans Past-due Status of Loans by Class (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	$ 15,017	$ 13,375
Current	1,282,058	1,224,908
Ending balance	1,297,075	1,238,283	$ 1,164,139
90 Plus Days And Accruing	1,560	351
Commercial | Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	1,774	2,051
Current	371,036	351,192
Ending balance	372,810	353,243	323,809
90 Plus Days And Accruing	0	0
Commercial | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	271	10
Current	37,813	27,294
Ending balance	38,084	27,304	38,056
90 Plus Days And Accruing	0	0
Commercial | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	5,028	580
Current	213,745	195,811
Ending balance	218,773	196,391	181,528
90 Plus Days And Accruing	1,464	0
Municipal
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	0	0
Current	41,288	51,128
Ending balance	41,288	51,128	33,391
90 Plus Days And Accruing	0	0
Residential | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	0	76
Current	14,813	17,667
Ending balance	14,813	17,743	17,868
90 Plus Days And Accruing	0	0
Residential | Term
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	4,640	6,638
Current	487,815	462,507
Ending balance	492,455	469,145	432,661
90 Plus Days And Accruing	86	339
Home Equity LIne of Credit
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	2,957	3,731
Current	89,392	94,738
Ending balance	92,349	98,469	111,302
90 Plus Days And Accruing	0	0
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	347	289
Current	26,156	24,571
Ending balance	26,503	24,860	$ 25,524
90 Plus Days And Accruing	10	12
30-59 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	6,139	5,958
30-59 Days Past Due | Commercial | Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	786	1,274
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	2,764	455
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	0	76
30-59 Days Past Due | Residential | Term
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	1,129	1,097
30-59 Days Past Due | Home Equity LIne of Credit
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	1,169	2,819
30-59 Days Past Due | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	291	237
60-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	2,092	3,977
60-89 Days Past Due | Commercial | Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	377	0
60-89 Days Past Due | Commercial | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	14	10
60-89 Days Past Due | Commercial | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	465	5
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	0
60-89 Days Past Due | Residential | Term
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	1,132	3,518
60-89 Days Past Due | Home Equity LIne of Credit
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	58	419
60-89 Days Past Due | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	46	25
90 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	6,786	3,440
90 Days Past Due | Commercial | Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	611	777
90 Days Past Due | Commercial | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	257	0
90 Days Past Due | Commercial | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	1,799	120
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	2,379	2,023
90 Days Past Due | Home Equity LIne of Credit
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	1,730	493
90 Days Past Due | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	$ 10	$ 27

Loans Nonaccrual Loans (Details

Loans Nonaccrual Loans (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans	$ 16,649	$ 14,727
Commercial | Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans	1,784	1,226
Commercial | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans	256	0
Commercial | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans	6,534	8,664
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	5,899	4,062
Home Equity LIne of Credit
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans	2,171	760
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans	$ 5	$ 15

Loans Information Regarding Imp

Loans Information Regarding Impaired Loans (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Receivables [Abstract]
Average investment in impaired loans	$ 31,557	$ 31,805	$ 29,108
Interest income recognized on impaired loans, all on cash basis	735	864	784
Balance of impaired loans	29,274	31,751	31,392
Less portion for which no allowance for loan losses is allocated	(18,212)	(21,030)
Portion of impaired loan balance for which an allowance for loan losses is allocated	11,062	10,721
Portion of allowance for loan losses allocated to the impaired loan balance	$ 2,213	$ 2,308	$ 1,812

Loans Impaired Loans by Class (

Loans Impaired Loans by Class (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Impaired Financing Receivable, Recorded Investment [Abstract]
Recorded Investment, No Related Allowance	$ 18,212	$ 21,030	$ 18,023
Recorded Investment, With Related Allowance	11,062	10,721	13,369
Balance of impaired loans	29,274	31,751	31,392
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]
Unpaid Principal Balance, No Related Allowance	20,330	22,831	19,775
Unpaid Principal Balance, With Related Allowance	11,848	11,397	13,698
Unpaid Principal Balance	32,178	34,228	33,473
Related Allowance	2,213	2,308	1,812
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Average Recorded Investment, No Related Allowance	20,542	18,776	19,227
Average Recorded Investment, With Related Allowance	11,015	13,029	9,881
Average Recorded Investment	31,557	31,805	29,108
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract]
Recognized Interest Income, No Related Allowance	593	764	553
Recognized Interest Income, With Related Allowance	142	100	231
Recognized Interest Income	735	864	784
Commercial | Real Estate
Impaired Financing Receivable, Recorded Investment [Abstract]
Recorded Investment, No Related Allowance	5,235	8,718	3,791
Recorded Investment, With Related Allowance	1,074	1,042	3,999
Balance of impaired loans	6,309	9,760	7,790
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]
Unpaid Principal Balance, No Related Allowance	5,492	9,161	3,996
Unpaid Principal Balance, With Related Allowance	1,093	1,059	4,116
Unpaid Principal Balance	6,585	10,220	8,112
Related Allowance	251	260	224
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Average Recorded Investment, No Related Allowance	7,611	5,536	5,124
Average Recorded Investment, With Related Allowance	1,528	3,477	4,460
Average Recorded Investment	9,139	9,013	9,584
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract]
Recognized Interest Income, No Related Allowance	228	380	164
Recognized Interest Income, With Related Allowance	60	42	152
Recognized Interest Income	288	422	316
Commercial | Construction
Impaired Financing Receivable, Recorded Investment [Abstract]
Recorded Investment, No Related Allowance	958	721	741
Recorded Investment, With Related Allowance	0	0	0
Balance of impaired loans	958	721	741
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]
Unpaid Principal Balance, No Related Allowance	970	721	741
Unpaid Principal Balance, With Related Allowance	0	0	0
Unpaid Principal Balance	970	721	741
Related Allowance	0	0	0
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Average Recorded Investment, No Related Allowance	936	762	62
Average Recorded Investment, With Related Allowance	0	0	699
Average Recorded Investment	936	762	761
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract]
Recognized Interest Income, No Related Allowance	47	43	38
Recognized Interest Income, With Related Allowance	0	0	0
Recognized Interest Income	47	43	38
Commercial | Other
Impaired Financing Receivable, Recorded Investment [Abstract]
Recorded Investment, No Related Allowance	756	1,468	2,591
Recorded Investment, With Related Allowance	6,319	7,791	7,327
Balance of impaired loans	7,075	9,259	9,918
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]
Unpaid Principal Balance, No Related Allowance	786	1,555	2,671
Unpaid Principal Balance, With Related Allowance	6,925	8,216	7,371
Unpaid Principal Balance	7,711	9,771	10,042
Related Allowance	1,273	1,696	1,309
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Average Recorded Investment, No Related Allowance	965	2,037	1,908
Average Recorded Investment, With Related Allowance	6,778	7,471	2,584
Average Recorded Investment	7,743	9,508	4,492
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract]
Recognized Interest Income, No Related Allowance	29	32	36
Recognized Interest Income, With Related Allowance	0	5	0
Recognized Interest Income	29	37	36
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	10,176	9,136	9,769
Recorded Investment, With Related Allowance	2,263	1,768	1,979
Balance of impaired loans	12,439	10,904	11,748
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]
Unpaid Principal Balance, No Related Allowance	11,931	10,317	10,909
Unpaid Principal Balance, With Related Allowance	2,412	1,998	2,144
Unpaid Principal Balance	14,343	12,315	13,053
Related Allowance	237	335	255
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Average Recorded Investment, No Related Allowance	10,033	9,427	10,770
Average Recorded Investment, With Related Allowance	2,424	1,982	2,106
Average Recorded Investment	12,457	11,409	12,876
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract]
Recognized Interest Income, No Related Allowance	269	289	297
Recognized Interest Income, With Related Allowance	82	53	79
Recognized Interest Income	351	342	376
Home Equity LIne of Credit
Impaired Financing Receivable, Recorded Investment [Abstract]
Recorded Investment, No Related Allowance	1,087	972	1,115
Recorded Investment, With Related Allowance	1,401	120	64
Balance of impaired loans	2,488	1,092	1,179
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]
Unpaid Principal Balance, No Related Allowance	1,151	1,035	1,429
Unpaid Principal Balance, With Related Allowance	1,412	124	67
Unpaid Principal Balance	2,563	1,159	1,496
Related Allowance	447	17	24
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Average Recorded Investment, No Related Allowance	997	1,001	1,351
Average Recorded Investment, With Related Allowance	283	99	32
Average Recorded Investment	1,280	1,100	1,383
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract]
Recognized Interest Income, No Related Allowance	20	20	18
Recognized Interest Income, With Related Allowance	0	0	0
Recognized Interest Income	20	20	18
Consumer
Impaired Financing Receivable, Recorded Investment [Abstract]
Recorded Investment, No Related Allowance	0	15	16
Recorded Investment, With Related Allowance	5	0	0
Balance of impaired loans	5	15	16
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]
Unpaid Principal Balance, No Related Allowance	0	42	29
Unpaid Principal Balance, With Related Allowance	6	0	0
Unpaid Principal Balance	6	42	29
Related Allowance	5	0	0
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Average Recorded Investment, No Related Allowance	0	13	12
Average Recorded Investment, With Related Allowance	2	0	0
Average Recorded Investment	2	13	12
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 Specifi

Loans TDRs by Class and Specific Reserve (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019USD ($)loan	Dec. 31, 2018USD ($)loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | loan	81	76
Balance	$ 21,424	$ 25,222
Specific Reserves	$ 1,677	$ 1,568
Commercial | Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | loan	17	17
Balance	$ 4,836	$ 8,631
Specific Reserves	$ 246	$ 132
Commercial | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | loan	1	1
Balance	$ 701	$ 721
Specific Reserves	$ 0	$ 0
Commercial | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | loan	8	10
Balance	$ 6,932	$ 7,298
Specific Reserves	$ 1,231	$ 1,276
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	52	45
Balance	$ 8,472	$ 8,074
Specific Reserves	$ 200	$ 160
Home Equity LIne of Credit
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | loan	3	3
Balance	$ 483	$ 498
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 Associa

Loans TDRs by Class and Associated Specific Reserves (Details) $ in Thousands	Dec. 31, 2019USD ($)loan	Dec. 31, 2018USD ($)loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | loan	13	9
Balance	$ 1,510	$ 1,013
Specific Reserves	$ 217	$ 26
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	4	0
Balance	$ 371	$ 0
Specific Reserves	$ 131	$ 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	8
Balance	$ 972	$ 846
Specific Reserves	$ 86	$ 26
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 Post

Loans Pre-Modification and Post-Modification Outstanding Recorded Investment (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019USD ($)loan	Dec. 31, 2018USD ($)loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | loan	11	18
Pre-Modification Outstanding Recorded Investment	$ 1,203	$ 9,365
Post-Modification Outstanding Recorded Investment	1,060	9,032
Specific Reserves	$ 162	$ 1,344
Commercial | Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | loan	2	9
Pre-Modification Outstanding Recorded Investment	$ 109	$ 1,729
Post-Modification Outstanding Recorded Investment	90	1,727
Specific Reserves	$ 90	$ 42
Commercial | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | loan	0	0
Pre-Modification Outstanding Recorded Investment	$ 0	$ 0
Post-Modification Outstanding Recorded Investment	0	0
Specific Reserves	$ 0	$ 0
Commercial | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | loan	1	6
Pre-Modification Outstanding Recorded Investment	$ 98	$ 7,116
Post-Modification Outstanding Recorded Investment	98	6,798
Specific Reserves	$ 0	$ 1,276
Municipal
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | loan	0	0
Pre-Modification Outstanding Recorded Investment	$ 0	$ 0
Post-Modification Outstanding Recorded Investment	0	0
Specific Reserves	$ 0	$ 0
Residential | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | loan	0	0
Pre-Modification Outstanding Recorded Investment	$ 0	$ 0
Post-Modification Outstanding Recorded Investment	0	0
Specific Reserves	$ 0	$ 0
Residential | Term
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | loan	8	3
Pre-Modification Outstanding Recorded Investment	$ 996	$ 520
Post-Modification Outstanding Recorded Investment	872	507
Specific Reserves	$ 72	$ 26
Home Equity LIne of Credit
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | loan	0	0
Pre-Modification Outstanding Recorded Investment	$ 0	$ 0
Post-Modification Outstanding Recorded Investment	0	0
Specific Reserves	$ 0	$ 0
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | loan	0	0
Pre-Modification Outstanding Recorded Investment	$ 0	$ 0
Post-Modification Outstanding Recorded Investment	0	0
Specific Reserves	$ 0	$ 0

Allowance for Loan Losses Compo

Allowance for Loan Losses Composition of Allowance for Loans Losses, by Class (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for Loans Evaluated Individually for Impairment	$ 2,213	$ 2,308	$ 1,812
Allowance for Loans Evaluated Collectively for Impairment	9,426	8,924	8,917
Total Allowance for Loan Losses	11,639	11,232	10,729	$ 10,138
Commercial | Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for Loans Evaluated Individually for Impairment	251	260	224
Allowance for Loans Evaluated Collectively for Impairment	3,491	3,307	3,648
Total Allowance for Loan Losses	3,742	3,567	3,872	3,988
Commercial | 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	365	255	434
Total Allowance for Loan Losses	365	255	434	396
Commercial | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for Loans Evaluated Individually for Impairment	1,273	1,696	1,309
Allowance for Loans Evaluated Collectively for Impairment	2,056	1,845	2,049
Total Allowance for Loan Losses	3,329	3,541	3,358	1,780
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	27	24	20
Total Allowance for Loan Losses	27	24	20	18
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	25	34	36
Total Allowance for Loan Losses	25	34	36	44
Residential | Term
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for Loans Evaluated Individually for Impairment	237	335	255
Allowance for Loans Evaluated Collectively for Impairment	787	900	875
Total Allowance for Loan Losses	1,024	1,235	1,130	1,288
Home Equity LIne of Credit
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for Loans Evaluated Individually for Impairment	447	17	24
Allowance for Loans Evaluated Collectively for Impairment	631	713	668
Total Allowance for Loan Losses	1,078	730	692	807
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for Loans Evaluated Individually for Impairment	5	0	0
Allowance for Loans Evaluated Collectively for Impairment	862	630	545
Total Allowance for Loan Losses	867	630	545	559
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	1,182	1,216	642
Total Allowance for Loan Losses	$ 1,182	$ 1,216	$ 642	$ 1,258

Allowance for Loan Losses Finan

Allowance for Loan Losses Financing Receivable and Allowance Element by Class (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	$ 11,639	$ 11,232	$ 10,729	$ 10,138
Commercial | Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	3,742	3,567	3,872	3,988
Commercial | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	365	255	434	396
Commercial | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	3,329	3,541	3,358	1,780
Municipal
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	27	24	20	18
Residential | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	25	34	36	44
Residential | Term
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	1,024	1,235	1,130	1,288
Home Equity LIne of Credit
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	1,078	730	692	807
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	867	630	545	559
Unallocated
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	1,182	1,216	$ 642	$ 1,258
Specific Reserves on Loans Evaluated Individually for Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	2,213	2,308
Specific Reserves on Loans Evaluated Individually for Impairment | Commercial | Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	251	260
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	1,273	1,696
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	237	335
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	447	17
Specific Reserves on Loans Evaluated Individually for Impairment | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	5	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	1,983	2,085
General Reserves on Loans Based on Historical Loss Experience | Commercial | Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	729	742
General Reserves on Loans Based on Historical Loss Experience | Commercial | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	76	57
General Reserves on Loans Based on Historical Loss Experience | Commercial | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	430	414
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	5	12
General Reserves on Loans Based on Historical Loss Experience | Residential | Term
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	153	326
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	130	263
General Reserves on Loans Based on Historical Loss Experience | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	460	271
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	6,261	5,623
Reserves for Qualitative Factors | Commercial | Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	2,762	2,565
Reserves for Qualitative Factors | Commercial | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	289	198
Reserves for Qualitative Factors | Commercial | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	1,626	1,431
Reserves for Qualitative Factors | Municipal
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	27	24
Reserves for Qualitative Factors | Residential | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	20	22
Reserves for Qualitative Factors | Residential | Term
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	634	574
Reserves for Qualitative Factors | Home Equity LIne of Credit
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	501	450
Reserves for Qualitative Factors | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	402	359
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	1,182	1,216
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	$ 1,182	$ 1,216

Allowance for Loan Losses Narra

Allowance for Loan Losses Narrative (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019USD ($)loan_class	Dec. 31, 2018USD ($)	Dec. 31, 2017USD ($)	Dec. 31, 2016USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percent of related loans	0.48%	0.45%
Increase (decrease) in qualitative portion	$ 638
Allowance for loan losses	$ 11,639	$ 11,232	$ 10,729	$ 10,138
Allowance for loan losses as a percent of total loans	0.90%	0.91%
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	27.90%
Construction loans, maximum percent of capital	100.00%
Construction loans and non-owner-occupied commercial real estate loans, percent of capital	123.00%
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	$ 365	$ 255	434	396
Loan maturities	2 years
Home Equity LIne of Credit
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	$ 1,078	730	692	807
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	$ 25	34	36	44
Loan maturities	1 year
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	$ 867	630	$ 545	$ 559
Delinquent period before consumer loans are charged off	120 days
Unallocated Reserves
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	$ 1,182	$ 1,216
Percent of total allowance reserve	10.20%	10.80%
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 Risk

Allowance for Loan Losses Risk Ratings by Segment (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	$ 670,955	$ 628,066
Commercial | Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	372,810	353,243
Commercial | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	38,084	27,304
Commercial | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	218,773	196,391
Municipal
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	41,288	51,128
1 Strong
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	4,290	3,444
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	4,258	3,444
1 Strong | Municipal
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	32	0
2 Above average
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	57,664	63,885
2 Above average | Commercial | Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	12,393	10,484
2 Above average | Commercial | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	794	37
2 Above average | Commercial | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	6,187	4,564
2 Above average | Municipal
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	38,290	48,800
3 Satisfactory
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	118,920	129,105
3 Satisfactory | Commercial | Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	74,709	80,266
3 Satisfactory | Commercial | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	2,305	2,231
3 Satisfactory | Commercial | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	41,527	46,090
3 Satisfactory | Municipal
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	379	518
4 Average
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	334,503	275,268
4 Average | Commercial | Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	205,510	172,597
4 Average | Commercial | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	19,017	18,780
4 Average | Commercial | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	107,389	82,081
4 Average | Municipal
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	2,587	1,810
5 Watch
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	126,222	117,841
5 Watch | Commercial | Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	63,582	66,325
5 Watch | Commercial | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	15,488	5,970
5 Watch | Commercial | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	47,152	45,546
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	3,148	8,695
6 OAEM | Commercial | Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	1,160	6,890
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	1,988	1,805
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	26,208	29,705
8 Doubtful | Commercial | Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	15,456	16,558
8 Doubtful | Commercial | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	480	286
8 Doubtful | Commercial | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	10,272	12,861
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	0	123
8 Doubtful | Commercial | Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	0	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 Activ

Allowance for Loan Losses Activity by Class (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance				$ 11,232				$ 10,729	$ 11,232	$ 10,729	$ 10,138
Chargeoffs									1,120	1,273	1,618
Recoveries									277	276	209
Provision for loan losses	$ 375	$ 250	$ 250	375	$ 167	$ 333	$ 500	500	1,250	1,500	2,000
Ending balance	11,639				11,232				11,639	11,232	10,729
Ending balance specifically evaluated for impairment	2,213				2,308				2,213	2,308	1,812
Ending balance collectively evaluated for impairment	9,426				8,924				9,426	8,924	8,917
Ending balance	1,297,075				1,238,283				1,297,075	1,238,283	1,164,139
Ending balance specifically evaluated for impairment	29,274				31,751				29,274	31,751	31,392
Ending balance collectively evaluated for impairment	1,267,801				1,206,532				1,267,801	1,206,532	1,132,747
Commercial | Real Estate
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance				3,567				3,872	3,567	3,872	3,988
Chargeoffs									89	168	587
Recoveries									15	52	0
Provision for loan losses									249	(189)	471
Ending balance	3,742				3,567				3,742	3,567	3,872
Ending balance specifically evaluated for impairment	251				260				251	260	224
Ending balance collectively evaluated for impairment	3,491				3,307				3,491	3,307	3,648
Ending balance	372,810				353,243				372,810	353,243	323,809
Ending balance specifically evaluated for impairment	6,309				9,760				6,309	9,760	7,790
Ending balance collectively evaluated for impairment	366,501				343,483				366,501	343,483	316,019
Commercial | Construction
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance				255				434	255	434	396
Chargeoffs									0	0	0
Recoveries									0	0	0
Provision for loan losses									110	(179)	38
Ending balance	365				255				365	255	434
Ending balance specifically evaluated for impairment	0				0				0	0	0
Ending balance collectively evaluated for impairment	365				255				365	255	434
Ending balance	38,084				27,304				38,084	27,304	38,056
Ending balance specifically evaluated for impairment	958				721				958	721	741
Ending balance collectively evaluated for impairment	37,126				26,583				37,126	26,583	37,315
Commercial | Other
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance				3,541				3,358	3,541	3,358	1,780
Chargeoffs									179	423	212
Recoveries									73	40	49
Provision for loan losses									(106)	566	1,741
Ending balance	3,329				3,541				3,329	3,541	3,358
Ending balance specifically evaluated for impairment	1,273				1,696				1,273	1,696	1,309
Ending balance collectively evaluated for impairment	2,056				1,845				2,056	1,845	2,049
Ending balance	218,773				196,391				218,773	196,391	181,528
Ending balance specifically evaluated for impairment	7,075				9,259				7,075	9,259	9,918
Ending balance collectively evaluated for impairment	211,698				187,132				211,698	187,132	171,610
Municipal
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance				24				20	24	20	18
Chargeoffs									0	0	0
Recoveries									0	0	0
Provision for loan losses									3	4	2
Ending balance	27				24				27	24	20
Ending balance specifically evaluated for impairment	0				0				0	0	0
Ending balance collectively evaluated for impairment	27				24				27	24	20
Ending balance	41,288				51,128				41,288	51,128	33,391
Ending balance specifically evaluated for impairment	0				0				0	0	0
Ending balance collectively evaluated for impairment	41,288				51,128				41,288	51,128	33,391
Residential | Construction
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance				34				36	34	36	44
Chargeoffs									0	0	0
Recoveries									0	0	0
Provision for loan losses									(9)	(2)	(8)
Ending balance	25				34				25	34	36
Ending balance specifically evaluated for impairment	0				0				0	0	0
Ending balance collectively evaluated for impairment	25				34				25	34	36
Ending balance	14,813				17,743				14,813	17,743	17,868
Ending balance specifically evaluated for impairment	0				0				0	0	0
Ending balance collectively evaluated for impairment	14,813				17,743				14,813	17,743	17,868
Residential | Term
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance				1,235				1,130	1,235	1,130	1,288
Chargeoffs									445	213	456
Recoveries									57	64	40
Provision for loan losses									177	254	258
Ending balance	1,024				1,235				1,024	1,235	1,130
Ending balance specifically evaluated for impairment	237				335				237	335	255
Ending balance collectively evaluated for impairment	787				900				787	900	875
Ending balance	492,455				469,145				492,455	469,145	432,661
Ending balance specifically evaluated for impairment	12,439				10,904				12,439	10,904	11,748
Ending balance collectively evaluated for impairment	480,016				458,241				480,016	458,241	420,913
Home Equity LIne of Credit
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance				730				692	730	692	807
Chargeoffs									69	121	28
Recoveries									4	24	11
Provision for loan losses									413	135	(98)
Ending balance	1,078				730				1,078	730	692
Ending balance specifically evaluated for impairment	447				17				447	17	24
Ending balance collectively evaluated for impairment	631				713				631	713	668
Ending balance	92,349				98,469				92,349	98,469	111,302
Ending balance specifically evaluated for impairment	2,488				1,092				2,488	1,092	1,179
Ending balance collectively evaluated for impairment	89,861				97,377				89,861	97,377	110,123
Consumer
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance				630				545	630	545	559
Chargeoffs									338	348	335
Recoveries									128	96	109
Provision for loan losses									447	337	212
Ending balance	867				630				867	630	545
Ending balance specifically evaluated for impairment	5				0				5	0	0
Ending balance collectively evaluated for impairment	862				630				862	630	545
Ending balance	26,503				24,860				26,503	24,860	25,524
Ending balance specifically evaluated for impairment	5				15				5	15	16
Ending balance collectively evaluated for impairment	26,498				24,845				26,498	24,845	25,508
Unallocated
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance				$ 1,216				$ 642	1,216	642	1,258
Chargeoffs									0	0	0
Recoveries									0	0	0
Provision for loan losses									(34)	574	(616)
Ending balance	1,182				1,216				1,182	1,216	642
Ending balance specifically evaluated for impairment	0				0				0	0	0
Ending balance collectively evaluated for impairment	1,182				1,216				1,182	1,216	642
Ending balance	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 Schedule

Premises and Equipment Schedule of Premises and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	$ 41,004	$ 40,719
Less accumulated depreciation	19,699	18,663
Premises and equipment, net	21,305	22,056
Land
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	5,100	4,852
Land improvements
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	1,100	1,105
Buildings
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	21,946	22,301
Equipment
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	$ 12,858	$ 12,461

Premises and Equipment Anticipa

Premises and Equipment Anticipated Rental Revenue (Details) $ in Thousands	Dec. 31, 2019USD ($)
Property, Plant and Equipment [Abstract]
2020	$ 129
2021	129
2022	125
2023	41
2024	16
Thereafter	0
Total	$ 440

Other Real Estate Owned (Detail

Other Real Estate Owned (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Summary Other Real Estate Owned [Abstract]
Real estate acquired in settlement of loans	$ 279	$ 584
Real Estate Owned Valuation Allowance [Roll Forward]
Balance at beginning of year	0	53	$ 205
Losses charged to allowance	0	(53)	(169)
Provision charged to operating expenses	0	0	17
Balance at end of year	$ 0	$ 0	$ 53

Income Taxes (Details)

Income Taxes (Details) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019USD ($)limited_partnership	Sep. 30, 2019USD ($)	Jun. 30, 2019USD ($)	Mar. 31, 2019USD ($)	Dec. 31, 2018USD ($)limited_partnership	Sep. 30, 2018USD ($)	Jun. 30, 2018USD ($)	Mar. 31, 2018USD ($)	Dec. 31, 2019USD ($)limited_partnership	Dec. 31, 2018USD ($)limited_partnership	Dec. 31, 2017USD ($)
Federal income tax
Current									$ 3,978	$ 4,407	$ 4,184
Deferred									336	(492)	2,083
Federal income tax expense									4,314	3,915	6,267
State franchise tax									421	391	345
Income tax expense	$ 1,261	$ 1,180	$ 1,180	$ 1,114	$ 1,222	$ 1,088	$ 1,040	$ 956	4,735	4,306	6,612
Reconciliation between US expected tax rate and actual tax expense
Expected tax expense									6,355	5,847	9,170
Non-taxable income									(1,749)	(1,699)	(2,625)
State franchise tax, net of federal tax benefit									332	309	224
Equity compensation									(45)	(55)	(83)
Tax credits, net of amortization									(85)	(85)	(88)
Change in federal tax rate									0	0	134
Other									(73)	(11)	(120)
Income tax expense	1,261	$ 1,180	$ 1,180	$ 1,114	1,222	$ 1,088	$ 1,040	$ 956	4,735	4,306	$ 6,612
Components of deferred tax assets and liabilities
Allowance for loan losses	2,444				2,359				2,444	2,359
Accrued pension and post-retirement	926				955				926	955
Unrealized loss on securities available for sale	0				1,343				0	1,343
Unrealized loss on securities transferred from available for sale to held to maturity	48				52				48	52
Restricted stock grants	203				170				203	170
Core deposit intangible	21				18				21	18
Investment in flow through entities	55				31				55	31
Other assets	0				24				0	24
Total deferred tax asset	3,697				4,952				3,697	4,952
Net deferred loan costs	(1,669)				(1,504)				(1,669)	(1,504)
Depreciation	(1,434)				(1,300)				(1,434)	(1,300)
Unrealized gain on securities available for sale	(972)				0				(972)	0
Goodwill	(120)				(80)				(120)	(80)
Mortgage servicing rights	(325)				(284)				(325)	(284)
Unrealized gain on derivative instruments	(26)				(382)				(26)	(382)
Prepaid expense	(205)				(159)				(205)	(159)
Total deferred tax liability	(4,751)				(3,709)				(4,751)	(3,709)
Net deferred tax asset (liability)	$ 1,054								$ 1,054
Net deferred tax asset (liability)					$ 1,243					$ 1,243
Limited partnerships
Limited partnerships held as investments | limited_partnership	4				3				4	3
Tax credits from investments in limited partnerships									$ 330	$ 210
Amortization of investments in limited partnerships									307	186
Carrying value of investments in limited partnerships	$ 1,951				$ 1,408				1,951	1,408
Total exposure to limited partnerships	$ 1,951				$ 1,408				$ 1,951	$ 1,408

Certificates of Deposit (Detail

Certificates of Deposit (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Maturities Of Certificates Of Deposit [Line Items]
Certificates of deposit less than $100,000	$ 277,225	$ 372,464
Certificates $100,000 to $250,000	345,241	162,185
Certificates $250,000 and over	67,513	56,760
Total	689,979	591,409
Maturity of certificates of deposit [Abstract]
2020	507,231
2021	47,291
2022	53,855
2023	58,180
2024	23,271
2025 and thereafter	151
Total	689,979	591,409
Interest expense on certificates of deposit of $100,000 or greater	6,060	$ 3,038	$ 2,105
Less than $100,000
Maturities Of Certificates Of Deposit [Line Items]
Total	277,225
Maturity of certificates of deposit [Abstract]
2020	176,860
2021	21,055
2022	35,923
2023	24,687
2024	18,549
2025 and thereafter	151
Total	277,225
$100,000 and Greater
Maturities Of Certificates Of Deposit [Line Items]
Total	412,754
Maturity of certificates of deposit [Abstract]
2020	330,371
2021	26,236
2022	17,932
2023	33,493
2024	4,722
2025 and thereafter	0
Total	$ 412,754

Borrowed Funds (Details)

Borrowed Funds (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018
Disclosure of Repurchase Agreements [Abstract]
Range of repurchase agreements' maturity dates	one to 365
Amount of line of credit with correspondent banks	$ 51,000
Credit facility with Federal Reserve Bank	$ 119,000
Federal Home Loan Bank, Advances, Maturities Summary [Abstract]
Interest rate, due in year two	1.55%
Interest rate, due in year three	0.00%	1.55%
Interest rate, due in year four	0.00%
Interest rate, due in year five	0.00%
Interest rate, due thereafter	0.00%
Due in twelve months maturity	$ 137,400	$ 105,000
Due in year two maturity	10,000	55,000
Due in year three maturity	0	10,000
Due in year four maturity	0
Due in year five maturity	105
Due thereafter	0	112
Total	147,505	170,112
Repurchase agreements for municipal and commercial customers	37,450	40,205
Total	$ 184,955	$ 210,317	$ 181,417	$ 181,858	$ 170,419	$ 265,274	$ 297,455	$ 244,229
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	1.60%	2.25%
Interest rate, due in year two		1.60%
Interest rate, due thereafter		0.00%
Interest rate, Repurchase agreements for municipal and commercial customers	0.10%	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	1.97%	2.58%
Interest rate, due in year two		1.97%
Interest rate, Repurchase agreements for municipal and commercial customers	2.33%	2.00%

Employee Benefit Plans (Details

Employee Benefit Plans (Details)	12 Months Ended
	Dec. 31, 2019USD ($)planemployee	Dec. 31, 2018USD ($)	Dec. 31, 2017USD ($)
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	$ 575,000	$ 578,000	$ 554,000
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	$ 165,000	176,000	$ 219,000
Accrued pension liability	$ 2,828,000	$ 2,949,000
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 2020	108,000
Expected future benefit payments in 2021	106,000
Expected future benefit payments in 2022	103,000
Expected future benefit payments in 2023	101,000
Expected future benefit payments in 2024	107,000
Expected future benefit payments in 2024 through 2028	496,000
Estimated plan expense	$ 64,000
Federal statutory income tax rate (percent)	21.00%	21.00%

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, 2019USD ($)	Dec. 31, 2018USD ($)	Dec. 31, 2017USD ($)	Dec. 31, 2019USD ($)	Dec. 31, 2018USD ($)	Dec. 31, 2017USD ($)
Change in Benefit Obligations [Roll Forward]
Benefit obligation at beginning of year	$ 1,599	$ 1,874	$ 1,870
Interest cost	66	77	77
Benefits paid	(97)	(117)	(113)
Actuarial (gain) loss				$ 13	$ (235)	$ 40
Benefit obligation at end of period	1,581	1,599	1,874
Funded Status of Plan [Abstract]
Benefit obligation at end of period	(1,599)	(1,874)	(1,874)	(1,581)	(1,599)	(1,874)
Unamortized (gain) loss				(31)	(47)	186
Accrued benefit cost				$ (1,612)	$ (1,646)	$ (1,688)
Weighted average discount rate as of December 31				0.0300	0.0425	0.0425
Components of Net Periodic Benefit Cost [Abstract]
Interest cost	66	77	77
Amortization of loss	0	0	0
Other settlement (income) expense	(2)	(3)	11
Net periodic benefit cost	$ 64	$ 74	$ 88
Weighted average discount rate for net periodic cost	3.00%	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, 2019	Dec. 31, 2018
Retirement Benefits, Description [Abstract]
Unamortized net actuarial gain (loss)	$ 31	$ 47
Deferred tax (expense) benefit at 21%	(7)	(10)
Net unrecognized post-retirement benefits included in accumulated other comprehensive income (loss)	24	$ 37
Portion to Be Recognized in Income in 2020
Unamortized net actuarial gain (loss)	(158)
Deferred tax (expense) benefit at 21%	33
Net unrecognized post-retirement benefits included in accumulated other comprehensive income (loss)	$ (125)

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, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward]
Balance	$ 208,489	$ 204,593	$ 197,787	$ 191,542	$ 184,661	$ 183,304	$ 181,372	$ 181,321	$ 191,542	$ 181,321	$ 172,521
Reclassification adjustment for effect of enacted tax law changes											0
Other comprehensive gain (loss)	327	597	3,395	3,050	3,419	(1,677)	(904)	(2,933)	7,369	(2,095)	(1,378)
Balance	212,508	$ 208,489	$ 204,593	197,787	191,542	$ 184,661	$ 183,304	181,372	212,508	191,542	181,321
Accumulated Net Unrealized Investment Gain (Loss)
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward]
Balance				$ (5,051)				$ (2,901)	(5,051)	(2,901)	(935)
Unrealized gains (losses) during the period									11,247	(2,585)	(1,763)
Realized gains during the period									(224)	(137)	(471)
Related deferred taxes									(2,315)	572	782
Reclassification adjustment for effect of enacted tax law changes									0	0	(514)
Other comprehensive gain (loss)									8,708	(2,150)	(1,966)
Balance	$ 3,657				$ (5,051)				$ 3,657	$ (5,051)	$ (2,901)

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, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward]
Balance	$ 208,489	$ 204,593	$ 197,787	$ 191,542	$ 184,661	$ 183,304	$ 181,372	$ 181,321	$ 191,542	$ 181,321	$ 172,521
Reclassification adjustment for effect of enacted tax law changes											0
Other comprehensive gain (loss)	327	597	3,395	3,050	3,419	(1,677)	(904)	(2,933)	7,369	(2,095)	(1,378)
Balance	212,508	$ 208,489	$ 204,593	197,787	191,542	$ 184,661	$ 183,304	181,372	212,508	191,542	181,321
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				$ (197)				$ (174)	(197)	(174)	(129)
Amortization of unrealized losses									19	(29)	(22)
Related deferred taxes									(4)	6	8
Reclassification adjustment for effect of enacted tax law changes									0	0	(31)
Other comprehensive gain (loss)									15	(23)	(45)
Balance	$ (182)				$ (197)				$ (182)	$ (197)	$ (174)

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, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance	$ 208,489	$ 204,593	$ 197,787	$ 191,542	$ 184,661	$ 183,304	$ 181,372	$ 181,321	$ 191,542	$ 181,321	$ 172,521
Reclassification adjustment for effect of enacted tax law changes											0
Other comprehensive gain (loss)	327	597	3,395	3,050	3,419	(1,677)	(904)	(2,933)	7,369	(2,095)	(1,378)
Balance	212,508	$ 208,489	$ 204,593	197,787	191,542	$ 184,661	$ 183,304	181,372	212,508	191,542	181,321
Accumulated Net Gain (Loss) from Cash Flow Hedges
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance				$ 1,438				$ 1,544	1,438	1,544	1,163
Unrealized gains (losses) during the period									(1,697)	(134)	165
Related deferred taxes									356	28	(58)
Reclassification adjustment for effect of enacted tax law changes									0	0	274
Other comprehensive gain (loss)									(1,341)	(106)	381
Balance	$ 97				$ 1,438				$ 97	$ 1,438	$ 1,544

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, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward]
Balance	$ 208,489	$ 204,593	$ 197,787	$ 191,542	$ 184,661	$ 183,304	$ 181,372	$ 181,321	$ 191,542	$ 181,321	$ 172,521
Reclassification adjustment for effect of enacted tax law changes											0
Other comprehensive gain (loss)	327	597	3,395	3,050	3,419	(1,677)	(904)	(2,933)	7,369	(2,095)	(1,378)
Balance	212,508	$ 208,489	$ 204,593	197,787	191,542	$ 184,661	$ 183,304	181,372	212,508	191,542	181,321
Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss)
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward]
Balance				$ 37				$ (147)	37	(147)	(102)
Unrealized gains (losses) during the period									(16)	233	(30)
Related deferred taxes									3	(49)	11
Reclassification adjustment for effect of enacted tax law changes									0	0	(26)
Other comprehensive gain (loss)									(13)	184	(45)
Balance	$ 24				$ 37				$ 24	$ 37	$ (147)

Financial Derivative Instrume_3

Financial Derivative Instruments (Details) - Cash Flow Hedging - Designated as Hedging Instrument	Dec. 31, 2019USD ($)derivative	Dec. 31, 2018USD ($)
June 27, 2016
Derivative [Line Items]
Fixed Rate Paid	0.893%
Notional Amount	$ 20,000,000	$ 20,000,000
Fair Value	$ 199,000	763,000
June 28, 2016
Derivative [Line Items]
Fixed Rate Paid	0.94%
Notional Amount	$ 30,000,000	30,000,000
Fair Value	$ 278,000	1,110,000
June 5, 2018, Maturity Date December 5, 2019
Derivative [Line Items]
Fixed Rate Paid	2.466%
Notional Amount	$ 0	25,000,000
Fair Value	$ 0	16,000
June 5, 2018, Maturity Date June 5, 2020
Derivative [Line Items]
Fixed Rate Paid	2.547%
Notional Amount	$ 25,000,000	25,000,000
Fair Value	$ (96,000)	(9,000)
June 5, 2018, Maturity Date December 5, 2020
Derivative [Line Items]
Fixed Rate Paid	2.603%
Notional Amount	$ 25,000,000	25,000,000
Fair Value	$ (234,000)	(60,000)
Interest Rate Swap December 5, 2019, Maturity Date December 5, 2022
Derivative [Line Items]
Fixed Rate Paid	1.779%
Notional Amount	$ 25,000,000	0
Fair Value	$ (98,000)	0
Interest Rate Swap August 2, 2019, Maturity Date August 2, 2024
Derivative [Line Items]
Fixed Rate Paid	1.59%
Notional Amount	$ 12,500,000	0
Fair Value	$ (11,000)	0
Interest Rate Swap August 5, 2019, Maturity Date August 5, 2024
Derivative [Line Items]
Fixed Rate Paid	1.42%
Notional Amount	$ 12,500,000	0
Fair Value	85,000	0
Interest Rate Swap
Derivative [Line Items]
Notional Amount	150,000,000	125,000,000
Fair Value	$ 123,000	1,820,000
Number of Positions | derivative	7
Customer Loan Swaps
Derivative [Line Items]
Notional Amount	$ 32,748,000	0
Fair Value	0	$ 0
Cash posted as collateral	3,050,000
Required collateral to be pledged	$ 1,113,000
Number of Positions	4	0
Customer Loan Swaps | Other Liabilities
Derivative [Line Items]
Notional Amount	$ 16,374,000	$ 0
Fair Value	$ (1,205,000)	$ 0
Number of Positions	2	0
Customer Loan Swaps | Other Assets
Derivative [Line Items]
Notional Amount	$ 16,374,000	$ 0
Fair Value	$ 1,205,000	$ 0
Number of Positions	2	0
Interest Rate Swap Maturity Date Prior to December 31, 2021
Derivative [Line Items]
Notional Amount	$ 100,000,000
Number of Positions	4
Interest Rate Swap Maturity Date Beyond December 31, 2021
Derivative [Line Items]
Notional Amount	$ 50,000,000
Number of Positions	3
Customer Loan Swaps Maturity Dates December 19, 2029 and October 1, 2039
Derivative [Line Items]
Number of Positions	2

Preferred and Common Stock (Det

Preferred and Common Stock (Details) - USD ($) $ in Thousands	12 Months Ended			216 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2016	Dec. 31, 2001
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)	52,819
Number of shares available for future use under employee savings and investment plan (in shares)	197,181
Number of shares issued during period, employee benefit plan (in shares)	13,408	12,138	12,762
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)	11,242	9,524	9,922	278,526
Number of shares for future use (in shares)	321,474
Proceeds from sale of common stock	$ 653	$ 619	$ 632
Capital Purchase Program
Common stock
Proceeds from sale of common stock	$ 653	$ 619	$ 632

Stock Options and Stock-Based_3

Stock Options and Stock-Based Compensation - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	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	162,892
Compensation cost related to restricted stock grants	$ 1,570
Compensation expense recognized for restricted shares	565	$ 381
Unrecognized compensation costs	$ 600	$ 678
Plan 2010 | Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares	65,039

Stock Options and Stock-Based_4

Stock Options and Stock-Based Compensation - Summary of Restricted Stock Granted (Details) - Plan 2010 - Restricted Stock - shares	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares	65,039
Remaining Term (In Years)	1 year 3 months 18 days
2015 | Five Years
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting Term (In Years)					5 years
Shares					8,904
Remaining Term (In Years)					6 days
2016 | Five Years
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting Term (In Years)				5 years
Shares				10,874
Remaining Term (In Years)				1 year 1 month 6 days
2017 | Three Years
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting Term (In Years)			3 years
Shares			4,602
Remaining Term (In Years)			3 days
2017 | Five Years
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting Term (In Years)			5 years
Shares			7,017
Remaining Term (In Years)			2 years 1 month 6 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)		3 days
2018 | Three Years
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting Term (In Years)		3 years
Shares		5,371
Remaining Term (In Years)		1 year 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)		2 years
2018 | Five Years
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting Term (In Years)		5 years
Shares		6,184
Remaining Term (In Years)		3 years
2019 | One Years
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting Term (In Years)	1 year
Shares	1,349
Remaining Term (In Years)	3 days
2019 | Two Years
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting Term (In Years)	2 years
Shares	1,484
Remaining Term (In Years)	1 year 1 month 6 days
2019 | Three Years
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting Term (In Years)	3 years
Shares	16,254
Remaining Term (In Years)	2 years 1 month 6 days

Earnings Per Share (Details)

Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income (Numerator) [Abstract]
Net income as reported	$ 6,686	$ 6,288	$ 6,395	$ 6,156	$ 6,363	$ 5,933	$ 5,734	$ 5,506	$ 25,525	$ 23,536	$ 19,588
Basic EPS: Income available to common shareholders									25,525	23,536	19,588
Diluted EPS: Income available to common shareholders plus assumed conversions									$ 25,525	$ 23,536	$ 19,588
Shares (Denominator) [Abstract]
Weighted average number of common shares outstanding (in shares)									10,815,718	10,783,419	10,747,306
Effect of dilutive securities: restricted stock (in shares)									73,591	69,055	71,712
Diluted EPS: Income available to common shareholders plus assumed conversions (in shares)									10,889,309	10,852,474	10,819,018
Per-Share Amount [Abstract]
Basic EPS: Income available to common shareholders (in dollars per share)	$ 0.62	$ 0.58	$ 0.59	$ 0.57	$ 0.59	$ 0.55	$ 0.53	$ 0.51	$ 2.36	$ 2.18	$ 1.82
Diluted EPS: Income available to common shareholders plus assumed conversions (in dollars per share)	$ 0.60	$ 0.58	$ 0.59	$ 0.57	$ 0.58	$ 0.55	$ 0.53	$ 0.51	$ 2.34	$ 2.17	$ 1.81

Regulatory Capital Requiremen_3

Regulatory Capital Requirements (Details) - USD ($)	Dec. 31, 2019	Dec. 31, 2018	Mar. 31, 2015
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Retained earnings from prior two years available for dividends	$ 26,111,000
Capital conservation buffer phase in, minimum (as a percentage)	0.00%		7.19%
Capital conservation buffer phase in, maximum (as a percentage)			2.50%
Tier 1 capital to risk-weighted assets [Abstract]
Actual	$ 178,773,000	$ 165,117,000
Actual	178,773,000	165,117,000
For capital adequacy purposes		$ 52,252,000
Risk-weighted assets [Abstract]
Actual (in hundredths)		14.22%
For capital adequacy purposes (in hundredths)		4.50%
Non Consolidated
Tier 2 capital to risk-weighted asets [Abstract]
Actual	189,421,000	$ 175,448,000
For capital adequacy purposes	99,756,000	92,892,000
To be well-capitalized under prompt corrective action provisions	124,695,000	116,115,000
Tier 1 capital to risk-weighted assets [Abstract]
Actual	177,682,000	164,116,000
For capital adequacy purposes	74,817,000	69,669,000
To be well-capitalized under prompt corrective action provisions	99,756,000	92,892,000
Actual	177,682,000	164,116,000
For capital adequacy purposes	56,113,000	52,252,000
To be well-capitalized under prompt corrective action provisions	$ 81,052,000	$ 75,474,000
Risk-weighted assets [Abstract]
Actual (in hundredths)	15.19%	15.11%
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)	14.25%	14.13%
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)	14.25%	14.13%
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	$ 177,682,000	$ 164,116,000
For capital adequacy purpose	80,385,000	77,269,000
To be well-capitalized under prompt corrective action provisions	$ 100,481,000	$ 96,586,000
Average assets [Abstract]
Actual (in hundredths)	8.84%	8.51%
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	$ 190,412,000	$ 176,349,000
For capital adequacy purposes	99,756,000	92,892,000
Tier 1 capital to risk-weighted assets [Abstract]
For capital adequacy purposes	74,817,000	$ 69,669,000
For capital adequacy purposes	$ 56,113,000
Risk-weighted assets [Abstract]
Actual (in hundredths)	15.27%	15.19%
For capital adequacy purposes (in hundredths)	8.00%	8.00%
Actual (in hundredths)	14.34%	14.22%
For capital adequacy purposes (in hundredths)	6.00%	6.00%
Actual (in hundredths)	14.34%
For capital adequacy purposes (in hundredths)	4.50%
Tier 1 capital to average assets [Abstract]
Actual	$ 178,773,000	$ 165,117,000
For capital adequacy purpose	$ 80,527,000	$ 76,810,000
Average assets [Abstract]
Actual (in hundredths)	8.88%	8.60%
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, 2019USD ($)derivative	Dec. 31, 2018USD ($)
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Off-balance-sheet financial instruments	$ 195,577,000	$ 166,312,000
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	7
Notional Amount	$ 150,000,000	125,000,000
Unrealized gain on derivative	97,000
Designated as Hedging Instrument | Customer Loan Interest Swap | Cash Flow Hedging
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Notional Amount	32,748,000
Unused lines, collateralized by residential real estate
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Off-balance-sheet financial instruments	81,193,000	83,421,000
Other unused commitments
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Off-balance-sheet financial instruments	90,186,000	60,033,000
Standby letters of credit
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Off-balance-sheet financial instruments	4,496,000	3,590,000
Commitments to extend credit
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Off-balance-sheet financial instruments	$ 19,702,000	$ 19,268,000

Fair Value Disclosures Assets a

Fair Value Disclosures Assets and Liabilities Recorded on a Recurring and Nonrecurring Basis (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	$ 360,520	$ 317,416
Allowance for loan losses, other real estate owned	0	0	$ 53	$ 205
Allowance for impaired loans	1,916	2,096
U.S. Government-sponsored agencies
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	7,398	5,007
Mortgage-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	326,617	307,693
State and political subdivisions
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	26,505	4,716
Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest rate swap agreements	1,767
Fair Value, Measurements, Recurring | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	0
Interest rate swap agreements	0
Derivative Liability	0	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	360,520
Interest rate swap agreements	1,767
Derivative Liability	1,644	69
Securities available for sale		317,416
Assets measured at fair value	362,287	319,305
Fair Value, Measurements, Recurring | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	0
Interest rate swap agreements	0
Derivative Liability	0	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	360,520
Derivative Liability	1,644	69
Securities available for sale		317,416
Assets measured at fair value	362,287	319,305
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
Derivative Liability	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	562	1,889
Derivative Liability	439	69
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
Derivative Liability	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	562	1,889
Derivative Liability	439	69
Fair Value, Measurements, Recurring | Customer Loan Interest Swap
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest rate swap agreements	1,205
Derivative Liability	1,205
Fair Value, Measurements, Recurring | Customer Loan Interest Swap | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest rate swap agreements	0
Derivative Liability	0
Fair Value, Measurements, Recurring | Customer Loan Interest Swap | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest rate swap agreements	1,205
Derivative Liability	1,205
Fair Value, Measurements, Recurring | Customer Loan Interest Swap | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest rate swap agreements	0
Derivative Liability	0
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	7,398
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	7,398
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	326,617
Securities available for sale		307,693
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	326,617
Securities available for sale		307,693
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	26,505
Securities available for sale		4,716
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	26,505
Securities available for sale		4,716
Fair Value, Measurements, Nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other real estate owned	279	584
Impaired loans	6,579	7,415
Assets measured at fair value	6,858	7,999
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	279	584
Impaired loans	6,579	7,415
Assets measured at fair value	6,858	7,999
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 Carrying

Fair Value Disclosures Carrying Amounts and Estimated Fair Values (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018
Financial assets
Securities to be held to maturity, fair value	$ 287,045				$ 250,900
Loans (net of allowance for loan losses)
Mortgage servicing rights	2,089				2,586
Financial liabilities
Certificates of deposit	689,979				591,409
Total deposits	1,650,466	$ 1,623,290	$ 1,592,956	$ 1,606,875	1,527,085	$ 1,514,911	$ 1,416,646	$ 1,428,192
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	287,045				250,900
Loans (net of allowance for loan losses)
Loans	6,579				7,415
Mortgage servicing rights	2,089				2,586
Financial liabilities
Certificates of deposit	281,480				281,282
National certificates of deposit	412,337				307,508
Total deposits	693,817				588,790
Repurchase agreements	37,450				40,161
Federal Home Loan Bank advances	140,063				169,240
Total borrowed funds	177,513				209,401
Level 2 | Commercial | Real Estate
Loans (net of allowance for loan losses)
Loans	2				423
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	5,046				6,096
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	577				793
Level 2 | Home Equity LIne of Credit
Loans (net of allowance for loan losses)
Loans	954				103
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	1,269,106				1,186,373
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	364,624				340,103
Level 3 | Commercial | Construction
Loans (net of allowance for loan losses)
Loans	37,366				26,344
Level 3 | Commercial | Other
Loans (net of allowance for loan losses)
Loans	207,502				183,746
Level 3 | Municipal
Loans (net of allowance for loan losses)
Loans	40,552				50,965
Level 3 | Residential | Construction
Loans (net of allowance for loan losses)
Loans	14,786				17,083
Level 3 | Residential | Term
Loans (net of allowance for loan losses)
Loans	490,782				450,530
Level 3 | Home Equity LIne of Credit
Loans (net of allowance for loan losses)
Loans	90,005				95,072
Level 3 | Consumer
Loans (net of allowance for loan losses)
Loans	23,489				22,530
Carrying Amount
Financial assets
Securities to be held to maturity, fair value	281,606				255,663
Loans (net of allowance for loan losses)
Loans	1,285,436				1,227,051
Mortgage servicing rights	1,546				1,354
Financial liabilities
Certificates of deposit	285,602				284,482
National certificates of deposit	404,377				306,927
Total deposits	689,979				591,409
Repurchase agreements	37,450				40,205
Federal Home Loan Bank advances	147,505				170,112
Total borrowed funds	184,955				210,317
Carrying Amount | Commercial | Real Estate
Loans (net of allowance for loan losses)
Loans	368,645				349,243
Carrying Amount | Commercial | Construction
Loans (net of allowance for loan losses)
Loans	37,678				27,018
Carrying Amount | Commercial | Other
Loans (net of allowance for loan losses)
Loans	215,068				192,420
Carrying Amount | Municipal
Loans (net of allowance for loan losses)
Loans	41,258				51,101
Carrying Amount | Residential | Construction
Loans (net of allowance for loan losses)
Loans	14,785				17,705
Carrying Amount | Residential | Term
Loans (net of allowance for loan losses)
Loans	491,315				467,760
Carrying Amount | Home Equity LIne of Credit
Loans (net of allowance for loan losses)
Loans	91,149				97,650
Carrying Amount | Consumer
Loans (net of allowance for loan losses)
Loans	25,538				24,154
Estimate of Fair Value
Financial assets
Securities to be held to maturity, fair value	287,045				250,900
Loans (net of allowance for loan losses)
Loans	1,275,685				1,193,788
Mortgage servicing rights	2,089				2,586
Financial liabilities
Certificates of deposit	281,480				281,282
National certificates of deposit	412,337				307,508
Total deposits	693,817				588,790
Repurchase agreements	37,450				40,161
Federal Home Loan Bank advances	140,063				169,240
Total borrowed funds	177,513				209,401
Estimate of Fair Value | Commercial | Real Estate
Loans (net of allowance for loan losses)
Loans	364,626				340,526
Estimate of Fair Value | Commercial | Construction
Loans (net of allowance for loan losses)
Loans	37,366				26,344
Estimate of Fair Value | Commercial | Other
Loans (net of allowance for loan losses)
Loans	212,548				189,842
Estimate of Fair Value | Municipal
Loans (net of allowance for loan losses)
Loans	40,552				50,965
Estimate of Fair Value | Residential | Construction
Loans (net of allowance for loan losses)
Loans	14,786				17,083
Estimate of Fair Value | Residential | Term
Loans (net of allowance for loan losses)
Loans	491,359				451,323
Estimate of Fair Value | Home Equity LIne of Credit
Loans (net of allowance for loan losses)
Loans	90,959				95,175
Estimate of Fair Value | Consumer
Loans (net of allowance for loan losses)
Loans	$ 23,489				$ 22,530

Other Operating Income and Ex_3

Other Operating Income and Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Other operating expense
Advertising and marketing expense	$ 1,174	$ 1,165	$ 1,208
Accounting and auditing expenses	828	837	818
ATM and interchange expense	1,176	995	886
ATM and debit card income
Other operating income
ATM and debit card income	$ 3,956	$ 3,556	$ 3,378

Condensed Financial Informati_3

Condensed Financial Information of Parent (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Assets
Cash and cash equivalents	$ 14,433	$ 21,418	$ 16,918	$ 15,270	$ 19,134	$ 21,649	$ 21,056	$ 16,559	$ 14,433	$ 19,134
Premises and equipment	21,305				22,056				21,305	22,056
Goodwill	29,805				29,805				29,805	29,805
Other assets	47,799				42,536				47,799	42,536
Total assets	2,068,796	2,033,227	1,998,699	1,991,345	1,944,570	1,981,854	1,913,961	1,871,815	2,068,796	1,944,570
Liabilities and shareholders' equity
Other liabilities	20,867	20,031	19,292	16,264	15,626	17,008	16,556	18,022	20,867	15,626
Total liabilities	1,856,288				1,753,028				1,856,288	1,753,028
Shareholders' equity
Common stock	109				109				109	109
Additional paid-in capital	63,964				62,746				63,964	62,746
Retained earnings	144,839				132,460				144,839	132,460
Total shareholders' equity	212,508	208,489	204,593	197,787	191,542	184,661	183,304	181,372	212,508	191,542	$ 181,321	$ 172,521
Total liabilities and shareholders' equity	2,068,796	2,033,227	1,998,699	1,991,345	1,944,570	1,981,854	1,913,961	1,871,815	2,068,796	1,944,570
Statements of Income
Net securities gains (losses)									224	137	471
Income before income taxes	7,947	7,468	7,575	7,270	7,585	7,021	6,774	6,462	30,260	27,842	26,200
Applicable tax expense	1,261	1,180	1,180	1,114	1,222	1,088	1,040	956	4,735	4,306	6,612
Equity in earnings of Bank
Net income	6,686	6,288	6,395	6,156	6,363	5,933	5,734	5,506	25,525	23,536	19,588
Cash flows from operating activities
Net income	6,686	$ 6,288	$ 6,395	6,156	6,363	$ 5,933	$ 5,734	5,506	25,525	23,536	19,588
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation									1,938	1,792	1,864
Equity compensation expense									565	381	392
(Gain) loss on sale of investments									(224)	(137)	(471)
(Increase) decrease in other assets									(7,690)	1,146	(4,817)
Decrease in other liabilities									2,802	3,848	(2,020)
Net cash provided by operating activities									26,053	33,840	22,273
Cash flows from investing activities
Proceeds from maturities, payments, calls of securities available for sale									78,825	51,752	156,969
Capital expenditures									(1,573)	(1,484)	(2,529)
Net cash used in investing activities									(116,280)	(112,077)	(130,060)
Cash flows from financing activities
Purchase of common stock									(183)	(168)	(154)
Proceeds from sale of common stock									653	619	632
Dividends paid									(12,963)	(12,052)	(11,460)
Net cash provided by financing activities									85,526	78,164	109,628
Cash and cash equivalents at beginning of year				19,134				19,207	19,134	19,207	17,366
Cash and cash equivalents at end of year	14,433				19,134				14,433	19,134	19,207
Parent Company
Assets
Cash and cash equivalents	1,028				1,190				1,028	1,190
Dividends receivable	3,200				2,950				3,200	2,950
Investment in subsidiary	183,654				162,763				183,654	162,763
Premises and equipment	0				2				0	2
Goodwill	27,559				27,559				27,559	27,559
Other assets	337				232				337	232
Total assets	215,778				194,696				215,778	194,696
Liabilities and shareholders' equity
Dividends payable	3,270				3,150				3,270	3,150
Other liabilities	0				4				0	4
Total liabilities	3,270				3,154				3,270	3,154
Shareholders' equity
Common stock	109				109				109	109
Additional paid-in capital	63,964				62,746				63,964	62,746
Retained earnings	148,435				128,687				148,435	128,687
Total shareholders' equity	212,508				191,542				212,508	191,542
Total liabilities and shareholders' equity	215,778				194,696				215,778	194,696
Statements of Income
Interest and dividends on investments									0	0	15
Net securities gains (losses)									0	137	(3)
Total income									0	137	12
Occupancy expense									1	2	5
Other operating expense									826	652	588
Total expense									827	654	593
Income before income taxes									(827)	(517)	(581)
Applicable tax expense									(230)	(164)	(187)
Loss before Bank earnings									(597)	(353)	(394)
Equity in earnings of Bank
Remitted									12,600	11,300	11,180
Unremitted									13,522	12,589	8,802
Net income									25,525	23,536	19,588
Cash flows from operating activities
Net income									25,525	23,536	19,588
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation									2	0	5
Equity compensation expense									565	381	392
(Gain) loss on sale of investments									0	(137)	3
(Increase) decrease in other assets									(105)	81	27
(Increase) decrease in dividends receivable									(250)	(450)	1,300
Increase (decrease) in dividends payable									120	551	(1,179)
Decrease in other liabilities									(4)	0	(3)
Unremitted earnings of Bank									(13,522)	(12,589)	(8,802)
Net cash provided by operating activities									12,331	11,373	11,331
Cash flows from investing activities
Proceeds from maturities, payments, calls of securities available for sale									0	459	0
Capital expenditures									0	1	(4)
Net cash used in investing activities									0	460	(4)
Cash flows from financing activities
Purchase of common stock									(183)	(168)	(154)
Proceeds from sale of common stock									653	619	632
Dividends paid									(12,963)	(12,052)	(11,460)
Net cash provided by financing activities									(12,493)	(11,601)	(10,982)
Net increase (decrease) in cash and cash equivalents									(162)	232	345
Cash and cash equivalents at beginning of year				$ 1,190				$ 958	1,190	958	613
Cash and cash equivalents at end of year	$ 1,028				$ 1,190				$ 1,028	$ 1,190	$ 958

New Accounting Pronouncements (

New Accounting Pronouncements (Details)	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	$ 297,000

Quarterly Information (Details)

Quarterly Information (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Balance Sheets
Cash and cash equivalents	$ 14,433	$ 21,418	$ 16,918	$ 15,270	$ 19,134	$ 21,649	$ 21,056	$ 16,559	$ 14,433	$ 19,134
Interest-bearing deposits in other banks	11,310	16,714	917	231	12,079	51,045	1,616	280	11,310	12,079
Investments	642,126	625,584	625,097	606,495	573,079	562,839	565,125	562,459	642,126	573,079
Restricted equity securities	8,982	8,982	8,982	8,982	11,586	11,586	12,363	11,947	8,982	11,586
Net loans and loans held for sale	1,285,590	1,252,546	1,237,661	1,253,585	1,227,051	1,233,010	1,213,449	1,177,329	1,285,590	1,227,051
Other assets	106,355	107,983	109,124	106,782	101,641	101,725	100,352	103,241	106,355	101,641
Total assets	2,068,796	2,033,227	1,998,699	1,991,345	1,944,570	1,981,854	1,913,961	1,871,815	2,068,796	1,944,570
Deposits	1,650,466	1,623,290	1,592,956	1,606,875	1,527,085	1,514,911	1,416,646	1,428,192	1,650,466	1,527,085
Borrowed funds	184,955	181,417	181,858	170,419	210,317	265,274	297,455	244,229	184,955	210,317
Other liabilities	20,867	20,031	19,292	16,264	15,626	17,008	16,556	18,022	20,867	15,626
Shareholders' equity	212,508	208,489	204,593	197,787	191,542	184,661	183,304	181,372	212,508	191,542	$ 181,321	$ 172,521
Total liabilities and shareholders' equity	2,068,796	2,033,227	1,998,699	1,991,345	1,944,570	1,981,854	1,913,961	1,871,815	2,068,796	1,944,570
Statements of Income
Interest income	19,657	19,904	19,822	19,268	18,801	18,086	17,205	16,451	78,651	70,543	60,832
Interest expense	6,239	6,678	6,872	6,369	5,806	5,550	4,936	4,042	26,158	20,334	13,529
Net interest income	13,418	13,226	12,950	12,899	12,995	12,536	12,269	12,409	52,493	50,209	47,303
Provision for loan losses	375	250	250	375	167	333	500	500	1,250	1,500	2,000
Net interest income after provision for loan losses	13,043	12,976	12,700	12,524	12,828	12,203	11,769	11,909	51,243	48,709	45,303
Non-interest income	3,908	3,532	3,605	3,144	3,253	3,034	3,181	3,132	14,189	12,600	12,548
Non-interest expense	9,004	9,040	8,730	8,398	8,496	8,216	8,176	8,579	35,172	33,467	31,651
Income before income taxes	7,947	7,468	7,575	7,270	7,585	7,021	6,774	6,462	30,260	27,842	26,200
Applicable tax expense	1,261	1,180	1,180	1,114	1,222	1,088	1,040	956	4,735	4,306	6,612
Net income	$ 6,686	$ 6,288	$ 6,395	$ 6,156	$ 6,363	$ 5,933	$ 5,734	$ 5,506	$ 25,525	$ 23,536	$ 19,588
Basic earnings per common share (in usd per share)	$ 0.62	$ 0.58	$ 0.59	$ 0.57	$ 0.59	$ 0.55	$ 0.53	$ 0.51	$ 2.36	$ 2.18	$ 1.82
Diluted earnings per common share (in usd per share)	$ 0.60	$ 0.58	$ 0.59	$ 0.57	$ 0.58	$ 0.55	$ 0.53	$ 0.51	$ 2.34	$ 2.17	$ 1.81
Other comprehensive income (loss), net of tax
Net unrealized gain (loss) on securities available for sale	$ (29)	$ 936	$ 4,289	$ 3,512	$ 4,082	$ (1,888)	$ (1,035)	$ (3,309)	$ 8,708	$ (2,150)	$ (1,452)
Net unrealized loss on securities transferred from available for sale to held to maturity, net of tax	7	1	4	3	(3)	(5)	(7)	(8)	15	(23)	(14)
Net unrealized gain (loss) on cash flow hedging derivative instruments	362	(340)	(898)	(465)	(844)	216	138	384
Unrecognized gain (loss) on postretirement benefit costs	(13)	0	0	0	184	0	0	0	(13)	184	(19)
Other comprehensive gain (loss)	327	597	3,395	3,050	3,419	(1,677)	(904)	(2,933)	7,369	(2,095)	(1,378)
Comprehensive income	$ 7,013	$ 6,885	$ 9,790	$ 9,206	$ 9,782	$ 4,256	$ 4,830	$ 2,573	$ 32,894	$ 21,441	$ 18,210