The First Bancorp, Inc. (FNLC) 10-K 5 Mar 21 2020 FY Annual report Financial data

Cover

Cover - USD ($)	12 Months Ended
	Dec. 31, 2020	Mar. 01, 2021	Jun. 30, 2020
Cover [Abstract]
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2020
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	Non-accelerated Filer
Entity Public Float			$ 222,030,000
Entity Common Stock, Shares Outstanding		10,984,439
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	FY
Amendment Flag	false
Entity Emerging Growth Company	false
Entity Small Business	true
ICFR Auditor Attestation Flag	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, 2020	Dec. 31, 2019
Assets
Cash and cash equivalents	$ 26,212	$ 14,433
Interest-bearing deposits in other banks	56,151	11,310
Securities available for sale	313,376	360,520
Securities to be held to maturity (fair value of $377,134,000 at December 31, 2020, and $287,045,000 at December 31, 2019)	365,613	281,606
Restricted equity securities, at cost	10,545	8,982
Loans held for sale	5,855	154
Loans	1,476,761	1,297,075
Less allowance for loan losses	16,253	11,639
Net loans	1,460,508	1,285,436
Accrued interest receivable	9,298	7,167
Premises and equipment, net	27,251	21,305
Other real estate owned	908	279
Goodwill	30,646	29,805
Other assets	54,873	47,799
Total assets	2,361,236	2,068,796
Liabilities
Demand deposits	250,219	169,777
NOW deposits	520,385	393,569
Money market deposits	163,819	161,000
Savings deposits	304,603	236,141
Certificates of deposit	605,585	689,979
Total deposits	1,844,611	1,650,466
Borrowed funds – short term	206,940	174,850
Borrowed funds – long term	55,098	10,105
Other liabilities	30,861	20,867
Total liabilities	2,137,510	1,856,288
Commitments and contingent liabilities
Shareholders' equity
Common stock, one cent par value per share	110	109
Additional paid-in capital	65,285	63,964
Retained earnings	158,359	144,839
Accumulated other comprehensive income (loss)
Net unrealized gain on securities available for sale	5,009	3,657
Net unrealized loss on securities transferred from available for sale to held to maturity	(133)	(182)
Net unrealized gain (loss) on cash flow hedging derivative instruments	(4,932)	97
Net unrealized gain on postretirement costs	28	24
Total shareholders' equity	223,726	212,508
Total liabilities and shareholders' equity	$ 2,361,236	$ 2,068,796
Common stock
Number of shares authorized (in shares)	18,000,000	18,000,000
Number of shares issued (in shares)	10,950,289	10,899,210
Number of shares outstanding (in shares)	10,950,289	10,899,210
Book value per common share (usd per share)	$ 20.43	$ 19.50
Tangible book value per common share (usd per share)	$ 17.60	$ 16.75

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Assets [Abstract]
Securities to be held to maturity, fair value	$ 377,134	$ 287,045
Stockholders' Equity Note [Abstract]
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, 2020	Dec. 31, 2019	Dec. 31, 2018
Interest and dividend income
Interest and fees on loans (includes tax-exempt income of $1,170,000 in 2020, $1,302,000 in 2019, and $1,157,000 in 2018)	$ 59,059	$ 59,239	$ 53,548
Interest on deposits with other banks	96	188	242
Interest and dividends on investments (includes tax-exempt income of $7,617,000 in 2020, $7,333,000 in 2019, and $6,954,000 in 2018)	17,964	19,224	16,753
Total interest and dividend income	77,119	78,651	70,543
Interest expense
Interest on deposits	14,139	23,268	15,970
Interest on borrowed funds	3,147	2,890	4,364
Total interest expense	17,286	26,158	20,334
Net interest income	59,833	52,493	50,209
Provision for loan losses	6,050	1,250	1,500
Net interest income after provision for loan losses	53,783	51,243	48,709
Non-interest income
Net securities gains	1,155	224	137
Other operating income	6,571	6,408	5,674
Non-interest income	18,119	14,189	12,600
Non-interest expense
Salaries and employee benefits	20,388	18,396	17,641
Occupancy expense	2,762	2,558	2,435
Furniture and equipment expense	4,799	3,990	3,924
FDIC insurance premiums	738	439	1,226
Acquisition-related costs	310	0	0
Amortization of identified intangibles	43	43	43
Other operating expense	10,612	9,746	8,198
Total non-interest expense	39,652	35,172	33,467
Income before income taxes	32,250	30,260	27,842
Applicable tax expense	5,121	4,735	4,306
Net income	$ 27,129	$ 25,525	$ 23,536
Basic earnings per common share (in usd per share)	$ 2.50	$ 2.36	$ 2.18
Diluted earnings per common share (in usd per share)	$ 2.48	$ 2.34	$ 2.17
Other comprehensive income (loss), net of tax
Net unrealized gain (loss) on securities available for sale	$ 1,352	$ 8,708	$ (2,150)
Net unrealized gain (loss) on securities transferred from available for sale to held to maturity, net of amortization	49	15	(23)
Net loss on cash flow hedging derivative instruments	(5,029)	(1,341)	(106)
Net unrecognized gain (loss) on postretirement benefits	4	(13)	184
Other comprehensive gain (loss)	(3,624)	7,369	(2,095)
Comprehensive income	23,505	32,894	21,441
Fiduciary and investment management income
Non-interest income
Non-interest income	3,660	3,318	3,030
Service charges on deposit accounts
Non-interest income
Non-interest income	1,648	2,330	2,194
Mortgage origination and servicing income
Non-interest income
Non-interest income	$ 5,085	$ 1,909	$ 1,565

Consolidated Statements of In_2

Consolidated Statements of Income and Comprehensive Income (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Statement [Abstract]
Interest and fees on loans (tax-exempt income)	$ 1,170	$ 1,302	$ 1,157
Interest and dividends on investments (tax-exempt income)	$ 7,617	$ 7,333	$ 6,954

Consolidated Statements of Chan

Consolidated Statements of Changes in Shareholders' Equity - USD ($) $ in Thousands	Total	Common stock and additional paid-in capital	Retained earnings	Accumulated other comprehensive income (loss)
Balance (in shares) at Dec. 31, 2017		10,829,918
Beginning balance at Dec. 31, 2017	$ 181,321	$ 61,855	$ 121,144	$ (1,678)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	23,536		23,536
Net unrealized loss on securities available for sale, net of tax	(2,150)			(2,150)
Net loss on cash flow hedging derivative instruments	(106)			(106)
Net unrealized gain on securities transferred from available for sale to held to maturity, net of tax	(23)			(23)
Unrecognized gain (loss) for post-retirement benefits, net of tax	184			184
Comprehensive income	21,441		23,536	(2,095)
Cash dividends declared	(12,052)		(12,052)
Equity compensation expense	381	$ 381
Payment for repurchase of common stock (in shares)		(5,725)
Payment for repurchase of common stock	(168)		(168)
Reclassification adjustment for effect of enacted tax law changes	0
Issuance of restricted stock (in shares)		16,795
Issuance of restricted stock	0
Proceeds from sale of common stock (in shares)		21,663
Proceeds from sale of common stock	619	$ 619
Balance (in shares) at Dec. 31, 2018		10,862,651
Ending balance at Dec. 31, 2018	191,542	$ 62,855	132,460	(3,773)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	6,156
Net unrealized loss on securities available for sale, net of tax	3,512
Net loss on cash flow hedging derivative instruments	(465)
Net unrealized gain on securities transferred from available for sale to held to maturity, net of tax	3
Ending balance at Mar. 31, 2019	197,787
Balance (in shares) at Dec. 31, 2018		10,862,651
Beginning balance at Dec. 31, 2018	191,542	$ 62,855	132,460	(3,773)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	25,525		25,525
Net unrealized loss on securities available for sale, net of tax	8,708			8,708
Net loss on cash flow hedging derivative instruments	(1,341)			(1,341)
Net unrealized gain on securities transferred from available for sale to held to maturity, net of tax	15			15
Unrecognized gain (loss) for post-retirement benefits, net of tax	(13)			(13)
Comprehensive income	32,894		25,525	7,369
Cash dividends declared	(12,963)		(12,963)
Equity compensation expense	565	$ 565
Payment for repurchase of common stock (in shares)		(7,178)
Payment for repurchase of common stock	(183)		(183)
Issuance of restricted stock (in shares)		19,087
Issuance of restricted stock	0
Proceeds from sale of common stock (in shares)		24,650
Proceeds from sale of common stock	$ 653	$ 653
Balance (in shares) at Dec. 31, 2019	10,899,210	10,899,210
Ending balance at Dec. 31, 2019	$ 212,508	$ 64,073	144,839	3,596
Beginning balance at Mar. 31, 2019	197,787
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	6,395
Net unrealized loss on securities available for sale, net of tax	4,289
Net loss on cash flow hedging derivative instruments	(898)
Net unrealized gain on securities transferred from available for sale to held to maturity, net of tax	4
Ending balance at Jun. 30, 2019	204,593
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	6,288
Net unrealized loss on securities available for sale, net of tax	936
Net loss on cash flow hedging derivative instruments	(340)
Net unrealized gain on securities transferred from available for sale to held to maturity, net of tax	1
Ending balance at Sep. 30, 2019	208,489
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	6,686
Net unrealized loss on securities available for sale, net of tax	(29)
Net loss on cash flow hedging derivative instruments	362
Net unrealized gain on securities transferred from available for sale to held to maturity, net of tax	$ 7
Balance (in shares) at Dec. 31, 2019	10,899,210	10,899,210
Ending balance at Dec. 31, 2019	$ 212,508	$ 64,073	144,839	3,596
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	6,495
Net unrealized loss on securities available for sale, net of tax	4,233
Net loss on cash flow hedging derivative instruments	(4,870)
Net unrealized gain on securities transferred from available for sale to held to maturity, net of tax	8
Ending balance at Mar. 31, 2020	$ 215,257
Balance (in shares) at Dec. 31, 2019	10,899,210	10,899,210
Beginning balance at Dec. 31, 2019	$ 212,508	$ 64,073	144,839	3,596
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	27,129		27,129
Net unrealized loss on securities available for sale, net of tax	1,352			1,352
Net loss on cash flow hedging derivative instruments	(5,029)			(5,029)
Net unrealized gain on securities transferred from available for sale to held to maturity, net of tax	49			49
Unrecognized gain (loss) for post-retirement benefits, net of tax	4			4
Comprehensive income	23,505		27,129	(3,624)
Cash dividends declared	(13,453)		(13,453)
Equity compensation expense	652	$ 652
Payment for repurchase of common stock (in shares)		(5,447)
Payment for repurchase of common stock	(156)		(156)
Issuance of restricted stock (in shares)		27,345
Issuance of restricted stock	0
Proceeds from sale of common stock (in shares)		29,181
Proceeds from sale of common stock	$ 670	$ 670
Balance (in shares) at Dec. 31, 2020	10,950,289	10,950,289
Ending balance at Dec. 31, 2020	$ 223,726	$ 65,395	158,359	(28)
Beginning balance at Mar. 31, 2020	215,257
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	6,569
Net unrealized loss on securities available for sale, net of tax	(790)
Net loss on cash flow hedging derivative instruments	(1,414)
Net unrealized gain on securities transferred from available for sale to held to maturity, net of tax	28
Ending balance at Jun. 30, 2020	216,584
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	7,095
Net unrealized loss on securities available for sale, net of tax	(1,580)
Net loss on cash flow hedging derivative instruments	387
Net unrealized gain on securities transferred from available for sale to held to maturity, net of tax	7
Ending balance at Sep. 30, 2020	219,440
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	6,970
Net unrealized loss on securities available for sale, net of tax	(511)
Net loss on cash flow hedging derivative instruments	868
Net unrealized gain on securities transferred from available for sale to held to maturity, net of tax	$ 6
Balance (in shares) at Dec. 31, 2020	10,950,289	10,950,289
Ending balance at Dec. 31, 2020	$ 223,726	$ 65,395	$ 158,359	$ (28)

Consolidated Statements of Ch_2

Consolidated Statements of Changes in Shareholders' Equity (Parenthetical) - $ / shares	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Statement of Stockholders' Equity [Abstract]
Cash dividends declared (usd per share)	$ 1.23	$ 1.19	$ 1.11

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Cash flows from operating activities
Net income	$ 27,129	$ 25,525	$ 23,536
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	2,221	1,938	1,792
Change in deferred taxes	(262)	336	(485)
Provision for loan losses	6,050	1,250	1,500
Loans originated for resale	(128,375)	(37,721)	(25,447)
Proceeds from sales and transfers of loans	125,982	38,218	26,323
Net gain on sales of loans	(3,308)	(651)	(490)
Net gain on sale or call of securities	(1,155)	(224)	(137)
Net amortization of investment premiums	1,944	1,082	1,820
Net gain on sale of other real estate owned	(170)	(113)	(312)
Provision for losses on other real estate owned	45	0	0
Equity compensation expense	652	565	381
Net (increase) decrease in other assets and accrued interest	(17,737)	(7,690)	1,146
Net increase in other liabilities	9,347	2,802	3,848
Net (gain) loss on disposal of premises and equipment	(19)	386	136
Amortization of investments in limited partnerships	311	307	186
Net acquisition amortization	43	43	43
Net cash provided by operating activities	22,698	26,053	33,840
Cash flows from investing activities
(Increase) decrease in interest-bearing deposits in other banks	(44,841)	769	(11,219)
Proceeds from sales of securities available for sale	103,579	8,339	459
Proceeds from maturities, payments, calls of securities available for sale	141,598	78,825	51,752
Proceeds from maturities, payments, calls and sales of securities held to maturity	81,809	24,087	14,094
Proceeds from sales of other real estate owned	542	418	1,350
Purchases of securities available for sale	(197,207)	(98,257)	(76,893)
Cash paid for limited partnerships	(717)	0	0
Purchases of securities to be held to maturity	(165,658)	(71,857)	(13,159)
Purchase of restricted equity securities	(1,563)	0	(1,228)
Redemption of restricted equity securities	0	2,604	0
Net increase in loans	(159,080)	(59,635)	(75,751)
Capital expenditures	(2,540)	(1,573)	(1,484)
Proceeds from sale of premises and equipment	67	0	2
Cash paid, net of cash acquired, in branch acquisition	(6,060)	0	0
Net cash used in investing activities	(250,071)	(116,280)	(112,077)
Cash flows from financing activities
Net increase in demand, savings, and money market accounts	262,035	24,811	75,798
Net increase (decrease) in certificates of deposit	(87,151)	98,570	32,408
Advances on long-term borrowings	55,000	0	0
Repayment on long-term borrowings	(10,007)	(25,362)	(80,000)
Net increase in short-term borrowings	32,090	0	61,559
Payment to repurchase common stock	(156)	(183)	(168)
Proceeds from sale of common stock	670	653	619
Dividends paid	(13,329)	(12,963)	(12,052)
Net cash provided by financing activities	239,152	85,526	78,164
Net increase (decrease) in cash and cash equivalents	11,779	(4,701)	(73)
Cash and cash equivalents at beginning of year	14,433	19,134	19,207
Cash and cash equivalents at end of year	26,212	14,433	19,134
Interest paid	17,560	26,088	20,104
Income taxes paid	5,049	3,994	3,057
Non-cash transactions:
Net transfer from loans to other real estate owned	1,046	0	610
Fair value of assets acquired	(25,328)	0	0
Less liabilities assumed	19,268	0	$ 0
Right of use lease asset	511	0
Operating lease liability	$ (511)	$ 0

Summary of Significant Accounti

Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2020
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	Nature of Operations The First Bancorp, Inc. (the "Company") through its wholly-owned subsidiary, First National Bank (the "Bank"), provides a full range of banking services to individual and corporate customers from seventeen offices in coastal and eastern Maine. First National Wealth Management, a division of the Bank, provides investment management, private banking and financial planning services. On January 28, 2016, the Board of Directors voted to change the Bank's name to First National Bank from The First, N.A. 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, 2020 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 ("TDR") 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 restructuring of debt constitutes a TDR 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. Regulatory guidance issued in March 2020 in response to the consequences of the COVID-19 pandemic, and the CARES Act passed shortly thereafter, granted exemption to TDR classification for certain qualified loan modification actions that normally would have been classified as TDRs. 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 acquisitions of FNB Bankshares in 2005, a bank branch in Rockland, Maine and bank building in Bangor, Maine in 2012, and a bank branch in Belfast, Maine in 2020, as well as the core deposit intangible related to the respective acquisitions. The Company annually evaluates goodwill, and periodically evaluates other intangible assets, for impairment. At December 31, 2020, 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. 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. Risks & Uncertainties As of December 31, 2020, local, U.S., and world governments have encouraged self-isolation to curtail the spread of the global pandemic, coronavirus disease (COVID-19), by mandating the temporary shut-down of business in many sectors and imposing limitations on travel and size and duration of group meetings. These conditions have continued to exist subsequent to December 31, 2020. Most industries are experiencing disruption to business operations and the impact of reduced consumer spending. There is unprecedented uncertainty surrounding the duration of the pandemic, its potential economic ramifications, and any government

Cash and Cash Equivalents

Cash and Cash Equivalents	12 Months Ended
	Dec. 31, 2020
Cash and Cash Equivalents [Abstract]
Cash and Cash Equivalents	Cash and Cash EquivalentsFor 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, 2020, the Company had a contractual clearing balance of $500,000 that is satisfied by both cash on hand at branches and balances held at the Federal Reserve Bank of Boston. The company had no reserve balance requirement at December 31, 2020. 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, 2020
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, 2020 and 2019: Amortized Unrealized Unrealized Fair Value As of December 31, 2020 Cost Gains Losses (Estimated) Securities available for sale U.S. government-sponsored agencies $ 23,045,000 $ — $ (315,000) $ 22,730,000 Mortgage-backed securities 238,516,000 5,507,000 (617,000) 243,406,000 State and political subdivisions 37,752,000 1,722,000 — 39,474,000 Asset-backed securities 7,723,000 43,000 — 7,766,000 $ 307,036,000 $ 7,272,000 $ (932,000) $ 313,376,000 Securities to be held to maturity U.S. Government-sponsored agencies $ 44,149,000 $ 143,000 $ (18,000) $ 44,274,000 Mortgage-backed securities 53,594,000 736,000 (195,000) 54,135,000 State and political subdivisions 245,620,000 10,427,000 (3,000) 256,044,000 Corporate securities 22,250,000 433,000 (2,000) 22,681,000 $ 365,613,000 $ 11,739,000 $ (218,000) $ 377,134,000 Restricted equity securities Federal Home Loan Bank Stock $ 9,508,000 $ — $ — $ 9,508,000 Federal Reserve Bank Stock 1,037,000 — — 1,037,000 $ 10,545,000 $ — $ — $ 10,545,000 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 The following table summarizes the contractual maturities of investment securities at December 31, 2020: 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 $ 117,000 $ 120,000 $ 3,607,000 $ 3,641,000 Due in 1 to 5 years 17,718,000 17,915,000 30,867,000 31,792,000 Due in 5 to 10 years 49,697,000 51,001,000 183,679,000 190,153,000 Due after 10 years 239,504,000 244,340,000 147,460,000 151,548,000 $ 307,036,000 $ 313,376,000 $ 365,613,000 $ 377,134,000 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 Fair Value (Estimated) Amortized 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 At December 31, 2020, securities with a fair value of $297,326,000 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 $214,173,000 as of December 31, 2019 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 2020, 2019 and 2018: 2020 2019 2018 Proceeds from sales of securities $ 112,179,000 $ 9,229,000 $ 459,000 Gross realized gains 1,689,000 224,000 137,000 Gross realized losses (534,000) — — Net gain $ 1,155,000 $ 224,000 $ 137,000 Related income taxes $ 243,000 $ 47,000 $ 29,000 Sales include 28 municipal securities sold in the second quarter of 2020 that had been designated as Held to Maturity. Proceeds from these sales totaled $8,600,000 against a cumulative book value of $8,313,000 resulting in a net realized gain of $268,000. The economic potential impact of COVID-19 is considered to be an isolated and unusual event that could not be reasonably anticipated as outlined in Accounting Standards Codification ("ASC") Section 320-10-25. Management conducted a review of its municipal bond portfolio in conjunction with risk mitigation efforts related to the onset of the COVID-19 virus; the intent of the review was to identify investment exposures with lower relative credit ratings, locales with perceived above average economic risk, municipal entities with reliance upon sales tax or income tax revenue, or any combination of these factors. Each of the sold positions met one or more of the criteria. Management reviews securities with unrealized losses for other than temporary impairment. As of December 31, 2020, there were 50 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 10 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, 2020 is summarized below: Less than 12 months 12 months or more Total Fair Unrealized Fair Unrealized Fair Unrealized As of December 31, 2020 Value Losses Value Losses Value Losses U.S. Government-sponsored agencies $ 30,212,000 $ (333,000) $ — $ — $ 30,212,000 $ (333,000) Mortgage-backed securities 65,505,000 (724,000) 3,878,000 (88,000) 69,383,000 (812,000) State and political subdivisions 855,000 (3,000) — — 855,000 (3,000) Corporate securities 2,498,000 (2,000) — — 2,498,000 (2,000) $ 99,070,000 $ (1,062,000) $ 3,878,000 $ (88,000) $ 102,948,000 $ (1,150,000) 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. 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 disclosed in Note 25, the Financial Accounting Standards Board ("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 $133,000, net of taxes, at December 31, 2020. This compares to $182,000, net of taxes, 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, 2020 and 2019, the Bank's investment in FHLB stock totaled $9,508,000 and $7,945,000, 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, 2020. The Bank will continue to monitor its investment in FHLB stock.

Mortgage Servicing Rights

Mortgage Servicing Rights	12 Months Ended
	Dec. 31, 2020
Transfers and Servicing [Abstract]
Mortgage Servicing Rights	Mortgage Servicing Rights At December 31, 2020 and 2019, the Bank serviced loans for others totaling $318,459,000 and $266,173,000, respectively. Net gains from the sale of loans, serviced by the Bank, totaled $3,308,000 in 2020, $651,000 in 2019, and $490,000 in 2018. In 2020, mortgage servicing rights of $1,160,000 were capitalized and amortization for the year totaled $352,000. At December 31, 2020, mortgage servicing rights had a fair value of $1,985,000. 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. FASB 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 The Bank recorded an impairment reserve as of December 31, 2020 for strata with a fair value lower than cost. Mortgage servicing rights are included in other assets and detailed in the following table: As of December 31, 2020 2019 Mortgage servicing rights $ 7,299,000 $ 6,140,000 Accumulated amortization (4,985,000) (4,594,000) Amortized cost 2,314,000 1,546,000 Impairment reserve (358,000) — Carrying value $ 1,956,000 $ 1,546,000

Loans

Loans	12 Months Ended
	Dec. 31, 2020
Loans and Leases Receivable Disclosure [Abstract]
Loans	Loans The following table shows the composition of the Company's loan portfolio as of December 31, 2020 and 2019: December 31, 2020 December 31, 2019 Commercial Real estate $ 442,121,000 29.9 % $ 372,810,000 28.7 % Construction 56,565,000 3.8 % 38,084,000 3.0 % Other 285,015,000 19.3 % 218,773,000 16.9 % Municipal 43,783,000 3.0 % 41,288,000 3.2 % Residential Term 522,070,000 35.3 % 492,455,000 37.9 % Construction 21,600,000 1.5 % 14,813,000 1.2 % Home equity line of credit 79,750,000 5.4 % 92,349,000 7.1 % Consumer 25,857,000 1.8 % 26,503,000 2.0 % Total loans $ 1,476,761,000 100.0 % $ 1,297,075,000 100.0 % Loan balances include net deferred loan costs of $6,931,000 in 2020 and $7,419,000 in 2019. Pursuant to collateral agreements, qualifying first mortgage loans and commercial real estate, which totaled $378,183,000 and $296,871,000 at December 31, 2020 and 2019, respectively, were used to collateralize borrowings from the Federal Home Loan Bank of Boston. In addition, commercial, residential construction and home equity loans totaling $259,599,000 at December 31, 2020 and $240,133,000 at December 31, 2019 were used to collateralize borrowings from the Federal Reserve Bank of Boston ("FRB") Discount Window Borrower In Custody ("BIC") program. The Bank enrolled to participate in FRB's Payroll Protection Program Liquidity Facility (PPPLF); as of December 31, 2020 no loans had been pledged and no advances taken under the PPPLF. The Bank is a designated Small Business Administration ("SBA") preferred lender and had processed 1,718 Paycheck Protection Program ("PPP") loan requests totaling $97,566,000 in funds disbursed to qualified small businesses as of December 31, 2020. The Bank is actively working with those borrowers and the SBA towards forgiveness of loan balances per program guidelines, with approximately $37,000,000 in forgiveness payments received through the end of December 2020. At December 31, 2020 and 2019, non-accrual loans were $6,721,000 and $16,649,000, respectively. For the years ended December 31, 2020 and 2019, interest income which would have been recognized on these loans, if interest had been accrued, was $558,000 and $906,000. Loans more than 90 days past due accruing interest totaled $1,505,000 at December 31, 2020 and $1,560,000 at December 31, 2019. 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 $36,880,000 at December 31, 2020 and $35,071,000 at December 31, 2019. A summary of loans to directors and executive officers is as follows: For the years ended December 31, 2020 2019 Balance at beginning of year $ 21,134,000 $ 22,149,000 New loans 3,544,000 521,000 Repayments (3,138,000) (1,536,000) Retired director (326,000) — Balance at end of year $ 21,214,000 $ 21,134,000 For all loan classes, loans over 30 days past due are considered delinquent. Information on the past-due status of loans by class of financing receivable as of December 31, 2020, is presented in the following table: 30-59 Days 60-89 Days 90+ Days All Current Total 90+ Days Commercial Real estate $ 139,000 $ 190,000 $ 226,000 $ 555,000 $ 441,566,000 $ 442,121,000 $ — Construction 13,000 — 80,000 93,000 56,472,000 56,565,000 — Other 490,000 62,000 2,082,000 2,634,000 282,381,000 285,015,000 1,464,000 Municipal — — — — 43,783,000 43,783,000 — Residential Term 540,000 1,799,000 1,616,000 3,955,000 518,115,000 522,070,000 23,000 Construction — — — — 21,600,000 21,600,000 — Home equity line of credit 1,645,000 324,000 367,000 2,336,000 77,414,000 79,750,000 — Consumer 89,000 42,000 18,000 149,000 25,708,000 25,857,000 18,000 Total $ 2,916,000 $ 2,417,000 $ 4,389,000 $ 9,722,000 $ 1,467,039,000 $ 1,476,761,000 $ 1,505,000 On March 22, 2020, banking regulators issued an Interagency Statement on Loan Modifications and Reporting in response to the onset of COVID-19; shortly thereafter, on March 30, 2020, the Coronavirus Aid, Relief, and Economic Security ("CARES") Act was passed. Both the Interagency Statement and the CARES Act provided an exemption for qualified modifications from TDR designation. The Company actively worked with borrowers impacted by the COVID-19 outbreak and as of December 31, 2020, a total of 1,031 loan modification requests for interest-only payments or deferred payments had been completed in conformance with the Interagency Statement or CARES Act, representing $291,100,000 in loan balances, or approximately 19.6% of the loan portfolio. One of these modifications of de minimis amount has been classified as a TDR since being modified. So long as modified terms are met, loans in an active modification are not included in past due loan totals and continue to accrue interest. As of December 31, 2020, loans totaling $62,208,000 or 4.2% of all loans, remained in either their original modification or a subsequent modification. Modification statuses by portfolio segment are summarized below: Commercial/Municipal Loan Modifications Units Percentage Balance Percentage Paid Off 61 10.0 % $ 9,027,000 4.0 % Subsequent Modification 54 9.0 % 32,724,000 14.0 % Still in Original Modification 16 3.0 % 7,244,000 3.0 % Out of Modification 470 78.0 % 189,413,000 79.0 % Total 601 100.0 % $ 238,408,000 100.0 % Residential Real Estate Modifications Units Percentage Balance Percentage Paid Off 27 7.0 % $ 5,930,000 12.0 % Subsequent Modification 154 43.0 % 19,468,000 38.0 % Still in Original Modification 27 7.0 % 2,615,000 5.0 % Out of Modification 154 43.0 % 23,553,000 45.0 % Total 362 100.0 % $ 51,566,000 100.0 % Consumer Loan Modifications Units Percentage Balance Percentage Paid Off 11 16.0 % $ 118,000 10.0 % Subsequent Modification 3 4.0 % 104,000 9.0 % Still in Original Modification 4 6.0 % 53,000 5.0 % Out of Modification 50 74.0 % 854,000 76.0 % Total 68 100.0 % $ 1,129,000 100.0 % Of the $213,819,000 in total loans that are Out of Modification, balances of $972,000 were past due as of December 31, 2020, a past due rate of 0.45%. Information on the past-due status of loans by class of financing receivable 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 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. Cash payments received on non-accrual loans, which are included in 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. Information on nonaccrual loans as of December 31, 2020 and 2019 is presented in the following table: As of December 31, 2020 2019 Commercial Real estate $ 543,000 $ 1,784,000 Construction 89,000 256,000 Other 1,481,000 6,534,000 Municipal — — Residential Term 3,593,000 5,899,000 Construction — — Home equity line of credit 1,015,000 2,171,000 Consumer — 5,000 Total $ 6,721,000 $ 16,649,000 Information regarding impaired loans is as follows: For the years ended December 31, 2020 2019 2018 Average investment in impaired loans $ 21,088,000 $ 31,557,000 $ 31,805,000 Interest income recognized on impaired loans, all on cash basis 478,000 735,000 864,000 As of December 31, 2020 2019 Balance of impaired loans $ 16,039,000 $ 29,274,000 Less portion for which no allowance for loan losses is allocated (12,098,000) (18,212,000) Portion of impaired loan balance for which an allowance for loan losses is allocated $ 3,941,000 $ 11,062,000 Portion of allowance for loan losses allocated to the impaired loan balance $ 462,000 $ 2,213,000 Impaired loans include TDR 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 class of financing receivable as of December 31, 2020, is presented in the following table: Recorded Investment Unpaid Related Allowance Average Recognized Interest With No Related Allowance Commercial Real estate $ 2,060,000 $ 2,368,000 $ — $ 4,123,000 $ 127,000 Construction 89,000 89,000 — 358,000 — Other 1,591,000 1,623,000 — 999,000 15,000 Municipal — — — — — Residential Term 7,335,000 8,629,000 — 8,773,000 193,000 Construction — — — — — Home equity line of credit 1,015,000 1,089,000 — 1,219,000 — Consumer 8,000 8,000 — 1,000 1,000 $ 12,098,000 $ 13,806,000 $ — $ 15,473,000 $ 336,000 With an Allowance Recorded Commercial Real estate $ 969,000 $ 995,000 $ 112,000 $ 1,018,000 $ 43,000 Construction 681,000 681,000 18,000 579,000 30,000 Other 188,000 202,000 169,000 1,193,000 3,000 Municipal — — — — — Residential Term 2,079,000 2,134,000 163,000 2,073,000 65,000 Construction — — — — — Home equity line of credit 24,000 24,000 — 744,000 1,000 Consumer — — — 8,000 — $ 3,941,000 $ 4,036,000 $ 462,000 $ 5,615,000 $ 142,000 Total Commercial Real estate $ 3,029,000 $ 3,363,000 $ 112,000 $ 5,141,000 $ 170,000 Construction 770,000 770,000 18,000 937,000 30,000 Other 1,779,000 1,825,000 169,000 2,192,000 18,000 Municipal — — — — — Residential Term 9,414,000 10,763,000 163,000 10,846,000 258,000 Construction — — — — — Home equity line of credit 1,039,000 1,113,000 — 1,963,000 1,000 Consumer 8,000 8,000 — 9,000 1,000 $ 16,039,000 $ 17,842,000 $ 462,000 $ 21,088,000 $ 478,000 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 class of financing receivable as of December 31, 2019, is presented in the following table: Recorded Investment Unpaid Related Allowance Average Recognized Interest 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 A breakdown of impaired loans by category as of December 31, 2018, is presented in the following table: Recorded Investment Unpaid Related Allowance Average Recognized Interest 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 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, 2020, the Company had 74 loans with a value of $11,534,000 that have been classified as TDRs. This compares to 81 loans with a value of $21,424,000 classified as TDRs as of December 31, 2019. 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, 2020: Number of Loans Balance Specific Reserves Commercial Real estate 13 $ 2,558,000 $ 106,000 Construction 1 681,000 18,000 Other 6 717,000 96,000 Municipal — — — Residential Term 51 7,384,000 149,000 Construction — — — Home equity line of credit 2 186,000 — Consumer 1 8,000 — 74 $ 11,534,000 $ 369,000 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 As of December 31, 2020, 14 of the loans classified as TDRs with a total balance of $1,577,000 were more than 30 days past due. One 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, 2020: Number of Loans Balance Specific Reserves Commercial Real estate — $ — $ — Construction — — — Other 4 419,000 92,000 Municipal — — — Residential Term 8 988,000 5,000 Construction — — — Home equity line of credit 1 162,000 — Consumer 1 8,000 — 14 $ 1,577,000 $ 97,000 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 For the year ended December 31, 2020, three 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, 2020: Number of Loans Pre-Modification Post-Modification Outstanding Specific Reserves Commercial Real estate — $ — $ — — Construction — — — — Other — — — — Municipal — — — — Residential Term 2 234,000 185,000 21,000 Construction — — — — Home equity line of credit — — — — Consumer 1 8,000 8,000 — 3 $ 242,000 $ 193,000 21,000 For the year ended December 31, 2019, 11 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, 2019. Number of Loans Pre-Modification Post-Modification Outstanding 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 As of December 31, 2020, Management is aware of seven loans classified as TDRs that are involved in bankruptcy with an outstanding balance of $810,000. As of December 31, 2020, there were 22 loans with an outstanding balance of $2,216,000 that were classified as TDRs and were on non-accrual status, two of which, with an outstanding balance of $254,000, were in the process of foreclosure. Residential Mortgage Loans in Process of Foreclosure As of December 31, 2020, there were 11 mortgage loans collateralized by residential real estate in the process of foreclosure with a total balance of $1,109,000; this compares to 14 mortgage loans collateralized by residential real estate in the process of foreclosure with a total balance of $1,502,000 as of December 31, 2019.

Allowance for Loan Losses

Allowance for Loan Losses	12 Months Ended
	Dec. 31, 2020
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, 2020 and 2019: As of December 31, 2020 2019 Allowance for Loans Evaluated Individually for Impairment Commercial Real estate $ 112,000 $ 251,000 Construction 18,000 — Other 169,000 1,273,000 Municipal — — Residential Term 163,000 237,000 Construction — — Home equity line of credit — 447,000 Consumer — 5,000 Total $ 462,000 $ 2,213,000 Allowance for Loans Evaluated Collectively for Impairment Commercial Real estate $ 5,066,000 $ 3,491,000 Construction 644,000 365,000 Other 3,269,000 2,056,000 Municipal 171,000 27,000 Residential Term 2,416,000 787,000 Construction 102,000 25,000 Home equity line of credit 1,211,000 631,000 Consumer 778,000 862,000 Unallocated 2,134,000 1,182,000 Total $ 15,791,000 $ 9,426,000 Total Allowance for Loan Losses Commercial Real estate $ 5,178,000 $ 3,742,000 Construction 662,000 365,000 Other 3,438,000 3,329,000 Municipal 171,000 27,000 Residential Term 2,579,000 1,024,000 Construction 102,000 25,000 Home equity line of credit 1,211,000 1,078,000 Consumer 778,000 867,000 Unallocated 2,134,000 1,182,000 Total $ 16,253,000 $ 11,639,000 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, 2020 and 2019, by class of financing receivable and allowance element, is presented in the following tables: As of December 31, 2020 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 $ 112,000 $ 721,000 $ 4,345,000 $ — $ 5,178,000 Construction 18,000 92,000 552,000 — 662,000 Other 169,000 465,000 2,804,000 — 3,438,000 Municipal — — 171,000 — 171,000 Residential Term 163,000 145,000 2,271,000 — 2,579,000 Construction — 6,000 96,000 — 102,000 Home equity line of credit — 151,000 1,060,000 — 1,211,000 Consumer — 282,000 496,000 — 778,000 Unallocated — — — 2,134,000 2,134,000 $ 462,000 $ 1,862,000 $ 11,795,000 $ 2,134,000 $ 16,253,000 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 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. Qualitative factors applied to the portfolio or segments of the portfolio may include judgments concerning general economic conditions that may affect credit quality, credit concentrations, the pace of portfolio growth, the direction of risk rating movements, policy exception levels, and delinquency levels; these qualitative factors are also considered in connection with the unallocated portion of our allowance for loan losses. The qualitative portion of the allowance for loan losses was 0.80% of related loans as of December 31, 2020 and 0.48% of related loans as of December 31, 2019. The qualitative portion increased $5,534,000 between December 31, 2019 and December 31, 2020 due to a mix of factors. These included the impacts of the COVID-19 pandemic on various macroeconomic measures used in the qualitative model, as well as analysis of the loan portfolio conducted under both top down and unit level approaches for factors such as levels of credit extended to industry segments particularly vulnerable to social distancing, and performance of COVID-19 related modifications. The unallocated component totaled $2,134,000 at December 31, 2020, or 13.1% of the total reserve. This compares to $1,182,000 or 10.2% as of December 31, 2019. While year to date growth in the qualitative portion of the reserve directionally reflects potential impacts of COVID-19 on the loan portfolio, it remains likely that there are other underlying credit risks not yet captured in loan specific or qualitative metrics the Company uses to estimate its allowance. This uncertainty along with general imprecision related to portfolio growth experienced year-to-date, and potential unknowns that may be present in loans acquired in the Belfast branch purchase, all support the continued inclusion of an unallocated component. The allowance for loan losses as a percent of total loans stood at 1.10% as of December 31, 2020, compared to 0.90% of total loans as of December 31, 2019. When PPP loan balances are excluded, the allowance for loan losses as a percent of total loans was 1.15% as of December 31, 2020. 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. In 2020, other commercial loans also include loans made under the SBA PPP. These loans are unsecured and carry a 100% guarantee from the SBA. 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 37.7% of capital at December 31, 2020 are below the regulatory guidance of 100.0% of capital. Construction loans and non- owner-occupied commercial real estate loans are at 147.1% of total capital at December 31, 2020, 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, 2020: Commercial Commercial Commercial Municipal All Risk- 1 Strong $ — $ — $ 2,402,000 $ 19,000 $ 2,421,000 2 Above average 5,938,000 2,343,000 6,326,000 41,939,000 56,546,000 3 Satisfactory 91,475,000 2,889,000 104,432,000 369,000 199,165,000 4 Average 261,539,000 31,221,000 120,570,000 1,456,000 414,786,000 5 Watch 72,840,000 19,893,000 44,293,000 — 137,026,000 6 OAEM 2,754,000 — 234,000 — 2,988,000 7 Substandard 7,575,000 219,000 6,758,000 — 14,552,000 8 Doubtful — — — — — Total $ 442,121,000 $ 56,565,000 $ 285,015,000 $ 43,783,000 $ 827,484,000 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, 2019: Commercial Commercial Commercial Municipal All Risk- 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 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, 2020. 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, 2020, 2019 and 2018: For the year ended December 31, 2020 Commercial Residential Home Equity Real Estate Construction Other Municipal Term Construction Consumer Unallocated Total Allowance for loan losses: Beginning 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 Chargeoffs 1,088,000 — 27,000 — 66,000 — 153,000 327,000 — 1,661,000 Recoveries — — 37,000 — 34,000 — 22,000 132,000 — 225,000 Provision 2,524,000 297,000 99,000 144,000 1,587,000 77,000 264,000 106,000 952,000 6,050,000 Ending balance $ 5,178,000 $ 662,000 $ 3,438,000 $ 171,000 $ 2,579,000 $ 102,000 $ 1,211,000 $ 778,000 $ 2,134,000 $ 16,253,000 Ending balance specifically evaluated for impairment $ 112,000 $ 18,000 $ 169,000 $ — $ 163,000 $ — $ — $ — $ — $ 462,000 Ending balance collectively evaluated for impairment $ 5,066,000 $ 644,000 $ 3,269,000 $ 171,000 $ 2,416,000 $ 102,000 $ 1,211,000 $ 778,000 $ 2,134,000 $ 15,791,000 Related loan balances: Ending balance $ 442,121,000 $ 56,565,000 $ 285,015,000 $ 43,783,000 $ 522,070,000 $ 21,600,000 $ 79,750,000 $ 25,857,000 $ — $ 1,476,761,000 Ending balance specifically evaluated for impairment $ 3,029,000 $ 770,000 $ 1,779,000 $ — $ 9,414,000 $ — $ 1,039,000 $ 8,000 $ — $ 16,039,000 Ending balance collectively evaluated for impairment $ 439,092,000 $ 55,795,000 $ 283,236,000 $ 43,783,000 $ 512,656,000 $ 21,600,000 $ 78,711,000 $ 25,849,000 $ — $ 1,460,722,000 For the year ended December 31, 2019 Commercial Residential Home Equity 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 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

Premises and Equipment

Premises and Equipment	12 Months Ended
	Dec. 31, 2020
Property, Plant and Equipment [Abstract]
Premises and Equipment	P remises and Equipment Premises and equipment are carried at cost and consist of the following: As of December 31, 2020 2019 Land $ 6,178,000 $ 5,100,000 Land improvements 1,710,000 1,100,000 Buildings 28,067,000 21,946,000 Equipment 11,878,000 12,858,000 47,833,000 41,004,000 Less accumulated depreciation 20,582,000 19,699,000 Total premises and equipment $ 27,251,000 $ 21,305,000 Future minimum receipts under lease agreements at December 31, 2020 by year and in the aggregate are: 2021 $129,000 2022 125,000 2023 41,000 2024 16,000 $311,000 Leases The Company adopted ASU No. 2016‑02, Leases , on January 1, 2019 with no required adjustment to prior periods presented or cumulative‑effect adjustment to retained earnings. As part of the branch acquisition in December 2020, the Company entered into an operating lease pertaining to land with a remaining lease term of 23 years, including an option to renew. The right‑of‑use asset and lease liability by lease type, and the associated balance sheet classifications as of December 31, 2020 were as follows: Balance Sheet Classification Right-of-use assets: Operating leases Premises and equipment, net $511,000 Lease liabilities: Operating leases Other liabilities $511,000 There was no lease expense for the year ended December 31, 2020 related to this lease. Future lease payments for operating leases with initial terms of one year or more as of December 31, 2020 are as follows: 2021 $28,000 2022 28,000 2023 28,000 2024 28,000 2025 28,000 Thereafter 486,000 Total undiscounted lease payments 626,000 Less: imputed interest 115,000 Net lease liability $511,000

Other Real Estate Owned

Other Real Estate Owned	12 Months Ended
	Dec. 31, 2020
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, 2020 2019 Real estate acquired in settlement of loans $ 908,000 $ 279,000 Changes in the allowance for losses from other real estate owned were as follows: For the years ended December 31, 2020 2019 2018 Balance at beginning of year $ — $ — $ 53,000 Losses charged to allowance — — (53,000) Provision charged to operating expenses 45,000 — — Balance at end of year $ 45,000 $ — $ —

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2020
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, 2020 2019 2018 Federal income tax Current $ 4,923,000 $ 3,978,000 $ 4,407,000 Deferred (262,000) 336,000 (492,000) 4,661,000 4,314,000 3,915,000 State franchise tax 460,000 421,000 391,000 $ 5,121,000 $ 4,735,000 $ 4,306,000 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, 2020 2019 2018 Expected tax expense $ 6,773,000 $ 6,355,000 $ 5,847,000 Non-taxable income (1,808,000) (1,749,000) (1,699,000) State franchise tax, net of federal tax benefit 348,000 332,000 309,000 Equity compensation (43,000) (45,000) (55,000) Tax credits, net of amortization (144,000) (85,000) (85,000) Other (5,000) (73,000) (11,000) $ 5,121,000 $ 4,735,000 $ 4,306,000 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, 2020 and 2019 are as follows: 2020 2019 Allowance for loan losses $ 3,413,000 $ 2,444,000 OREO 9,000 — Accrued pension and post-retirement 948,000 926,000 Unrealized loss on derivative instruments 1,865,000 345,000 Unrealized loss on securities transferred from available for sale to held to maturity 35,000 48,000 Restricted stock grants 270,000 203,000 Core deposit intangible 24,000 21,000 Investment in flow through entities 82,000 55,000 Other assets 87,000 — Total deferred tax asset 6,733,000 4,042,000 Net deferred loan costs (1,894,000) (1,669,000) Depreciation (2,013,000) (1,434,000) Unrealized gain on securities available for sale (1,332,000) (972,000) Goodwill (161,000) (120,000) Mortgage servicing rights (411,000) (325,000) Unrealized gain on derivative instruments (554,000) (371,000) Prepaid expense (195,000) (205,000) Total deferred tax liability (6,560,000) (5,096,000) Net deferred tax asset (liability) $ 173,000 $ (1,054,000) At December 31, 2020 and 2019, the Company held investments in four limited partnerships with related low income housing tax credits. The tax credits from the investments are estimated at $351,000 and $330,000 for the years ended December 31, 2020 and 2019, respectively, and are recorded as a reduction of income tax expense. Amortization of the investment in the limited partnership totaled $311,000 and $307,000 for the years ended December 31, 2020 and 2019, respectively, and is recognized as a component of income tax expense in the consolidated statements of income. The carrying value of these investments was $1,734,000 at December 31, 2020 and $1,951,000 at December 31, 2019, which is comprised of the Company's equity investment in the limited partnerships, and is recorded in other assets. 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 ("IRS") for the years ended December 31, 2017 through 2020.

Certificates of Deposit

Certificates of Deposit	12 Months Ended
	Dec. 31, 2020
Deposits [Abstract]
Certificates of Deposit	Certificates of Deposit The following table represents the breakdown of certificates of deposit at December 31, 2020 and 2019: December 31, 2020 December 31, 2019 Certificates of deposit < $100,000 $ 246,875,000 $ 277,225,000 Certificates $100,000 to $250,000 295,672,000 345,241,000 Certificates $250,000 and over 63,038,000 67,513,000 $ 605,585,000 $ 689,979,000 At December 31, 2020, 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 2021 $ 205,853,000 $ 294,486,000 $ 500,339,000 2022 16,889,000 21,411,000 38,300,000 2023 14,064,000 33,119,000 47,183,000 2024 4,562,000 4,926,000 9,488,000 2025 5,363,000 4,768,000 10,131,000 2026 and thereafter 144,000 — 144,000 $ 246,875,000 $ 358,710,000 $ 605,585,000 Interest on certificates of deposit of $100,000 or more was $5,327,000, $6,060,000, and $3,038,000 in 2020, 2019 and 2018, respectively.

Borrowed Funds

Borrowed Funds	12 Months Ended
	Dec. 31, 2020
Borrowed Funds [Abstract]
Borrowed Funds	Borrowed Funds Borrowed funds consist of advances from the FHLB, FRB, 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, 2020 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 Borrowed funds at December 31, 2020 and 2019 have the following range of interest rates and maturity dates: As of December 31, 2020 Federal Home Loan Bank Advances and Federal Reserve Bank Borrowings 2021 0.00% - 1.55% $ 137,600,000 2022 0.00% — 2023 0.00% — 2024 0.00% 98,000 2025 1.35% - 1.40% 55,000,000 2026 and thereafter 0.00% — 192,698,000 Repurchase agreements Municipal and commercial customers 0.10% - 2.00% 69,340,000 $ 262,038,000 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

Employee Benefit Plans

Employee Benefit Plans	12 Months Ended
	Dec. 31, 2020
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 3.0% of each eligible employee's compensation in 2020 and 2.0% in 2019, and 2018. The Company adopted the safe harbor form of 401(k) plan for 2020 and will follow safe harbor guidelines when determining the level of discretionary contribution.The expense related to the 401(k) plan was $981,000, $575,000, and $578,000 in 2020, 2019, and 2018, 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 $450,000 in 2020, $165,000 in 2019, and $176,000 in 2018. As of December 31, 2020 and 2019, the accrued liability of these plans was $2,991,000 and $2,828,000, 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, 2020 2019 2018 Change in benefit obligations Benefit obligation at beginning of year: $ 1,581,000 $ 1,599,000 $ 1,874,000 Interest cost 46,000 66,000 77,000 Benefits paid (97,000) (97,000) (117,000) Actuarial (gain) loss (7,000) 13,000 (235,000) Benefit obligation at end of year: $ 1,523,000 $ 1,581,000 $ 1,599,000 Funded status Benefit obligation at end of year $ (1,523,000) $ (1,581,000) $ (1,599,000) Unamortized gain (35,000) (31,000) (47,000) Accrued benefit cost $ (1,558,000) $ (1,612,000) $ (1,646,000) Weighted average discount rate as of December 31 2.00 % 3.00 % 4.25 % The following table sets forth the net periodic benefit cost: For the years ended December 31, 2020 2019 2018 Components of net periodic benefit cost Interest cost $ 46,000 $ 66,000 $ 77,000 Amortization of loss — — — Other settlement income (2,000) (2,000) (3,000) Net periodic benefit cost $ 44,000 $ 64,000 $ 74,000 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 2021 is $97,000. For years ending 2022 through 2025, the estimated amount of benefits to be paid is $94,000, $90,000, $98,000 and $95,000, respectively, and the total estimated amount of benefits to be paid for years ended 2025 through 2028 is $351,000. Plan expense for 2021 is estimated to be $29,000. 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, 2020 2019 Portion to Be Recognized in Unamortized net actuarial gain $ 35,000 $ 31,000 $ — Deferred tax expense at 21% (7,000) (7,000) — Net unrecognized post-retirement benefits included in accumulated other comprehensive income $ 28,000 $ 24,000 $ —

Other Comprehensive Income (Los

Other Comprehensive Income (Loss)	12 Months Ended
	Dec. 31, 2020
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, 2020, 2019 and 2018. For the years ended December 31, 2020 2019 2018 Balance at beginning of year $ 3,657,000 $ (5,051,000) $ (2,901,000) Unrealized gains (losses) arising during the year 2,866,000 11,247,000 (2,585,000) Reclassification of realized gains during the year (1,155,000) (224,000) (137,000) Related deferred taxes (359,000) (2,315,000) 572,000 Net change 1,352,000 8,708,000 (2,150,000) Balance at end of year $ 5,009,000 $ 3,657,000 $ (5,051,000) 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, 2020, 2019, and 2018. For the years ended December 31, 2020 2019 2018 Balance at beginning of year $ (182,000) $ (197,000) $ (174,000) Amortization of net unrealized gains (losses) 62,000 19,000 (29,000) Related deferred taxes (13,000) (4,000) 6,000 Net change 49,000 15,000 (23,000) Balance at end of year $ (133,000) $ (182,000) $ (197,000) 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, 2020, 2019, and 2018. For the years ended December 31, 2020 2019 2018 Balance at beginning of year $ 97,000 $ 1,438,000 $ 1,544,000 Unrealized losses on cash flow hedging derivatives arising during the year (6,366,000) (1,697,000) (134,000) Related deferred taxes 1,337,000 356,000 28,000 Net change (5,029,000) (1,341,000) (106,000) Balance at end of year $ (4,932,000) $ 97,000 $ 1,438,000 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, 2020, 2019, and 2018: For the years ended December 31, 2020 2019 2018 Unrecognized postretirement benefits at beginning of year $ 24,000 $ 37,000 $ (147,000) Change in unamortized net actuarial gain (loss) 5,000 (16,000) 233,000 Related deferred taxes (1,000) 3,000 (49,000) Net change 4,000 (13,000) 184,000 Unrecognized postretirement benefits at end of year $ 28,000 $ 24,000 $ 37,000 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, 2020
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 details of the interest rate swap agreements are as follows: December 31, 2020 December 31, 2019 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 Liabilities (Assets) $ 20,000,000 $ (76,000) $ 20,000,000 $ 199,000 06/28/16 06/28/21 1-Month USD LIBOR 0.940 % Other Liabilities (Assets) 30,000,000 (121,000) 30,000,000 278,000 06/05/18 06/05/20 1-Month USD LIBOR 2.547 % Other Liabilities — — 25,000,000 (96,000) 06/05/18 12/05/20 1-Month USD LIBOR 2.603 % Other Liabilities — — 25,000,000 (234,000) 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 (626,000) 12,500,000 (11,000) 08/05/19 08/05/24 1-Month USD LIBOR 1.420 % Other Liabilities (Assets) 12,500,000 (550,000) 12,500,000 85,000 02/12/20 02/12/23 3-Month USD LIBOR 1.486 % Other Liabilities 25,000,000 (695,000) — — 02/12/20 02/12/24 3-Month USD LIBOR 1.477 % Other Liabilities 25,000,000 (972,000) — — 06/28/21 06/28/26 1-Month USD LIBOR 1.158 % Other Liabilities 50,000,000 (1,872,000) — — 03/13/20 03/13/25 3-Month USD LIBOR 0.855 % Other Liabilities 25,000,000 (551,000) — — 03/13/20 03/13/30 3-Month USD LIBOR 1.029 % Other Liabilities 20,000,000 (339,000) — — 04/07/20 04/07/23 3-Month USD LIBOR 0.599 % Other Liabilities 20,000,000 (185,000) — — 04/07/20 04/07/24 3-Month USD LIBOR 0.643 % Other Liabilities 20,000,000 (255,000) — — $ 260,000,000 $ (6,242,000) $ 150,000,000 $ 123,000 During the first quarter of 2020, the Bank took advantage of market opportunities to restructure several interest rate swap positions and extend funding at favorable interest rates; one-time charges totaling $1,756,000 were incurred and expensed in the first quarter of 2020 in connection with the restructuring. 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 or swap termination. Amounts paid or received under the swaps are reported in interest expense in the consolidated statement of income, and in interest paid in the consolidated statement of cash flows. Customer loan derivatives The Bank 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, 2020 there were five customer loan swap arrangement in place, detailed below: December 31, 2020 December 31, 2019 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 5 $ 32,987,000 $ (2,640,000) 2 $ 16,374,000 $ (1,205,000) Receive Fixed, Pay Variable Other Assets 5 32,987,000 2,640,000 2 16,374,000 1,205,000 Total 10 $ 65,974,000 $ — 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, 2020, the Bank had posted to the counterparty $3,100,000 of cash and $10,000,000 (par value) in securities as collateral on its swap contracts. The required amount to be pledged was $9,011,000. Cessation of LIBOR As discussed in Item 1A Risk Factors, the Company is aware that certain tenors of USD LIBOR may no longer be published after December 31, 2021, while other tenors are expected to continue being published until June 30, 2023. The Federal Reserve formed the Alternative Reference Rates Committee (ARRC) to guide the transition process in the United States. ARRC has issued a number of recommendations including the adoption of the Secured Overnight Financing Rate (SOFR) as a replacement for LIBOR. 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 recently issued a voluntary fallback protocol for market participants. The Company has formed a working group to address the change away from LIBOR. Management intends to continue to monitor developments from ARRC and ISDA, along with guidance from US banking regulators, closely, and expects to pursue the steps ultimately recommended to provide for an orderly transition to a post-LIBOR environment. Each of the interest rate swap contracts the Company has in place as of December 31, 2020 is tied to a LIBOR tenor expected to be published until June 30, 2023. Two contracts carrying a total notional amount of $50 million are set to mature in 2021; two additional contracts carrying a total notional value of $45 million mature prior to June 30, 2023, and an additional seven contracts with a total notional amount of $165 million have maturity dates beyond June 30, 2023. The five customer loan swap contracts shown in the table immediately above have maturity dates of December 19, 2029, August 21, 2030, July 1, 2035, October 1, 2035 and April 1, 2039.

Common Stock

Common Stock	12 Months Ended
	Dec. 31, 2020
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, 2020, 66,935 shares had been issued pursuant to these plans, leaving 183,065 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 14,117 shares in 2020, 13,408 shares in 2019, and 12,138 shares in 2018. 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, 2020, 293,590 shares have been issued, leaving 306,410 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 15,064 shares in 2020, 11,242 shares in 2019, and 9,524 shares in 2018. Proceeds from issuances of common stock under these plans totaled $670,000, $653,000 and $619,000 for the years ended December 31, 2020, 2019 and 2018, respectively.

Stock Options and Stock-Based C

Stock Options and Stock-Based Compensation	12 Months Ended
	Dec. 31, 2020
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"). The 2010 Plan expired on April 28, 2020, leaving 215,513 shares not issued. At the 2020 Annual Meeting, shareholders approved the 2020 Equity Incentive Plan (the "2020 Plan"). This 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 the Company. Such grants and awards 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 2020 Plan qualify for treatment as incentive stock options for purposes of Section 422 of the Internal Revenue Code. Other compensation under the 2020 Plan will qualify as performance-based for purposes of Section 162(m) of the Internal Revenue Code, and will satisfy NASDAQ guidelines relating to equity compensation. As of December 31, 2020, 184,487 shares of restricted stock had been granted under the 2010 Plan and 5,750 shares under the 2020 Plan, of which 76,597 shares remain restricted as of December 31, 2020 as detailed in the following table: Year Vesting Term Shares Remaining Term 2016 5.0 10,874 0.1 2017 5.0 7,017 1.1 2018 3.0 5,371 0.1 2018 4.0 2,068 1.0 2018 5.0 6,184 2.0 2019 2.0 1,484 0.1 2019 3.0 16,254 1.1 2020 1.0 5,809 0.3 2020 2.0 694 1.1 2020 3.0 20,842 2.1 76,597 1.3 The compensation cost related to these restricted stock grants was $1,978,000 and will be recognized over the vesting terms of each grant. In 2020, $652,000 of expense was recognized for these restricted shares, leaving $694,000 in unrecognized expense as of December 31, 2020. In 2019, $565,000 of expense was recognized for restricted shares, leaving $600,000 in unrecognized expense as of December 31, 2019.

Earnings Per Share

Earnings Per Share	12 Months Ended
	Dec. 31, 2020
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, 2020, 2019 and 2018: Income Shares Per-Share For the year ended December 31, 2020 Net income as reported $ 27,129,000 Basic EPS: Income available to common shareholders 27,129,000 10,858,606 $ 2.50 Effect of dilutive securities: restricted stock 74,212 Diluted EPS: Income available to common shareholders plus assumed conversions $ 27,129,000 10,932,818 $ 2.48 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

Regulatory Capital Requirements

Regulatory Capital Requirements	12 Months Ended
	Dec. 31, 2020
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 2021 will be 2021 earnings plus retained earnings of $28,008,000 from 2020 and 2019. 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. The Company maintains its capital in accordance with the Basel III regulatory capital framework as approved by the federal banking agencies. 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. As of December 31, 2020, the Company's capital conservation buffer was 6.82%, and met the minimum requirement of 2.5%. As of December 31, 2020, 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 Bank's category. The actual and minimum capital amounts and ratios for the Bank are presented in the following table: Actual For capital To be well-capitalized As of December 31, 2020 Tier 2 capital to $ 207,461,000 $ 112,899,000 $ 141,124,000 risk-weighted assets 14.70 % 8.00 % 10.00 % Tier 1 capital to $ 191,108,000 $ 84,675,000 $ 112,899,000 risk-weighted assets 13.54 % 6.00 % 8.00 % Common equity Tier 1 capital to $ 191,108,000 $ 63,506,000 $ 91,731,000 risk-weighted assets 13.54 % 4.50 % 6.50 % Tier 1 capital to $ 191,108,000 $ 90,577,000 $ 113,221,000 average assets 8.44 % 4.00 % 5.00 % 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 % The actual and minimum capital amounts and ratios for the Company, on a consolidated basis, are presented in the following table: Actual For capital To be well-capitalized As of December 31, 2020 Tier 2 capital to $ 209,113,000 $ 112,899,000 n/a risk-weighted assets 14.82 % 8.00 % n/a Tier 1 capital to $ 192,760,000 $ 84,675,000 n/a risk-weighted assets 13.66 % 6.00 % n/a Common equity Tier 1 capital to $ 192,760,000 $ 63,506,000 n/a risk-weighted assets 13.66 % 4.50 % n/a Tier 1 capital to $ 192,760,000 $ 90,821,000 n/a average assets 8.49 % 4.00 % n/a 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

Off-Balance-Sheet Financial Ins

Off-Balance-Sheet Financial Instruments and Concentrations of Credit Risk	12 Months Ended
	Dec. 31, 2020
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 2020, 2019 or 2018. 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, 2020 and 2019, the Bank had the following off-balance-sheet financial instruments, whose contract amounts represent credit risk: As of December 31, 2020 2019 Unused lines, collateralized by residential real estate $ 89,852,000 $ 81,193,000 Other unused commitments 102,963,000 90,186,000 Standby letters of credit 4,415,000 4,496,000 Commitments to extend credit 34,526,000 19,702,000 Total $ 231,756,000 $ 195,577,000 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. During the first quarter of 2020, the Bank took advantage of market opportunities to restructure several interest rate swap positions and extend funding at favorable interest rates. At December 31, 2020, the Company had 11 outstanding, off-balance sheet, derivative instruments designated as cash flow hedges. These derivative instruments were interest rate swap agreements, with notional principal amounts totaling $260,000,000 and an unrealized loss of $4,932,000, 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, 2020, 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, 2020, the Bank had five customer loan swap contracts in place with a total notional value of $65,974,000.

Fair Value Disclosures

Fair Value Disclosures	12 Months Ended
	Dec. 31, 2020
Fair Value Disclosures [Abstract]
Fair Value Disclosures	Fair Value DisclosuresCertain 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, 2020 and 2019, 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, 2020 and 2019. At December 31, 2020 Level 1 Level 2 Level 3 Total Securities available for sale U.S. Government-sponsored agencies $ — $ 22,730,000 $ — $ 22,730,000 Mortgage-backed securities — 243,406,000 — 243,406,000 State and political subdivisions — 39,474,000 — 39,474,000 Asset-backed securities — 7,766,000 — 7,766,000 Total securities available for sale — 313,376,000 — 313,376,000 Customer loan interest swap agreements — 2,640,000 — 2,640,000 Total interest rate swap agreements — 2,640,000 — 2,640,000 Total assets $ — $ 316,016,000 $ — $ 316,016,000 At December 31, 2020 Level 1 Level 2 Level 3 Total Interest rate swap agreements $ — $ 6,242,000 $ — $ 6,242,000 Customer loan interest swap agreements — 2,640,000 — 2,640,000 Total liabilities $ — $ 8,882,000 $ — $ 8,882,000 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 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. Mortgage servicing rights are presented net of an impairment reserve of $358,000 at December 31, 2020 and $0 at December 31, 2019. Other real estate owned is presented net of an allowance for losses of $45,000 at December 31, 2020 and $0 at December 31, 2019. 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 $304,000 and $1,916,000 at December 31, 2020 and 2019, respectively. At December 31, 2020 Level 1 Level 2 Level 3 Total Mortgage servicing rights $ — $ 1,985,000 $ — $ 1,985,000 Other real estate owned — 908,000 — 908,000 Impaired loans — 794,000 — 794,000 Total assets $ — $ 3,687,000 $ — $ 3,687,000 At December 31, 2019 Level 1 Level 2 Level 3 Total Mortgage servicing rights $ — $ 2,089,000 $ — $ 2,089,000 Other real estate owned $ — $ 279,000 $ — $ 279,000 Impaired loans — 6,579,000 — 6,579,000 Total assets $ — $ 8,947,000 $ — $ 8,947,000 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, 2020 were as follows: Carrying Estimated As of December 31, 2020 value fair value Level 1 Level 2 Level 3 Financial assets Securities to be held to maturity $365,613,000 $377,134,000 $ — $377,134,000 $ — Loans (net of allowance for loan losses) Commercial Real estate 436,161,000 440,735,000 — 347,000 440,388,000 Construction 55,803,000 56,388,000 — — 56,388,000 Other 281,057,000 279,501,000 — 5,000 279,496,000 Municipal 43,586,000 44,440,000 — — 44,440,000 Residential Term 519,101,000 533,059,000 — 442,000 532,617,000 Construction 21,483,000 21,890,000 — — 21,890,000 Home equity line of credit 78,356,000 77,177,000 — — 77,177,000 Consumer 24,961,000 23,502,000 — — 23,502,000 Total loans 1,460,508,000 1,476,692,000 — 794,000 1,475,898,000 Mortgage servicing rights 1,956,000 1,985,000 — 1,985,000 — Financial liabilities Local certificates of deposit $250,264,000 $253,892,000 — $253,892,000 — National certificates of deposit 355,321,000 359,899,000 — 359,899,000 — Total certificates of deposit 605,585,000 613,791,000 — 613,791,000 — Repurchase agreements 69,340,000 69,497,000 — 69,497,000 — Other borrowed funds 192,698,000 194,469,000 — 194,469,000 — Total borrowed funds 262,038,000 263,966,000 — 263,966,000 — 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 689,979,000 693,817,000 — 693,817,000 — Repurchase agreements 37,450,000 37,450,000 — 37,450,000 — Other borrowed funds 147,505,000 140,063,000 — 140,063,000 — Total borrowed funds 184,955,000 177,513,000 — 177,513,000 —

Other Operating Income and Expe

Other Operating Income and Expense	12 Months Ended
	Dec. 31, 2020
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, 2020 2019 2018 Other operating income ATM and debit card income $ 4,138,000 $ 3,956,000 $ 3,556,000 Loan processing fees 1,200,000 812,000 711,000 Other operating expense Advertising and marketing expense $ 983,000 $ 1,174,000 $ 1,165,000 Accounting and auditing expenses 788,000 828,000 837,000 ATM and interchange expense 1,253,000 1,176,000 995,000 Swap termination expense 1,756,000 — —

Legal Contingencies

Legal Contingencies	12 Months Ended
	Dec. 31, 2020
Loss Contingency [Abstract]
Legal Contingencies	Legal ContingenciesVarious 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, 2020
Prior Period Adjustment [Abstract]
Reclassifications	ReclassificationsCertain 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, 2020
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, 2020 2019 Assets Cash and cash equivalents $ 1,287,000 $ 1,028,000 Dividends receivable 3,400,000 3,200,000 Investment in subsidiary 194,515,000 183,654,000 Goodwill 27,559,000 27,559,000 Other assets 360,000 337,000 Total assets $ 227,121,000 $ 215,778,000 Liabilities and shareholders' equity Dividends payable $ 3,395,000 $ 3,270,000 Other liabilities — — Total liabilities 3,395,000 3,270,000 Shareholders' equity Common stock 110,000 109,000 Additional paid-in capital 65,285,000 63,964,000 Retained earnings 158,331,000 148,435,000 Total shareholders' equity 223,726,000 212,508,000 Total liabilities and shareholders' equity $ 227,121,000 $ 215,778,000 Statements of Income For the years ended December 31, 2020 2019 2018 Net securities gains $ — $ — $ 137,000 Other operating income 8,000 — — Total income 8,000 — 137,000 Occupancy expense — 1,000 2,000 Other operating expense 911,000 826,000 652,000 Total expense 911,000 827,000 654,000 Loss before income taxes and Bank earnings (903,000) (827,000) (517,000) Applicable income taxes (246,000) (230,000) (164,000) Loss before Bank earnings (657,000) (597,000) (353,000) Equity in earnings of Bank Remitted 13,300,000 12,600,000 11,300,000 Unremitted 14,486,000 13,522,000 12,589,000 Net income $ 27,129,000 $ 25,525,000 $ 23,536,000 Statements of Cash Flows For the years ended December 31, 2020 2019 2018 Cash flows from operating activities: Net income $ 27,129,000 $ 25,525,000 $ 23,536,000 Adjustments to reconcile net income to net cash provided by operating activities: Depreciation — 2,000 — Equity compensation expense 652,000 565,000 381,000 Gain on sale of investments — — (137,000) (Increase) decrease in other assets (21,000) (105,000) 81,000 Increase in dividends receivable (200,000) (250,000) (450,000) Increase in dividends payable — 120,000 551,000 Decrease in other liabilities — (4,000) — Unremitted earnings of Bank (14,486,000) (13,522,000) (12,589,000) Net cash provided by operating activities 13,074,000 12,331,000 11,373,000 Cash flows from investing activities: Proceeds from sales/maturities of investments — — 459,000 Capital expenditures — — 1,000 Net cash provided by investing activities — — 460,000 Cash flows from financing activities: Purchase of common stock (156,000) (183,000) (168,000) Proceeds from sale of common stock 670,000 653,000 619,000 Dividends paid (13,329,000) (12,963,000) (12,052,000) Net cash used in financing activities (12,815,000) (12,493,000) (11,601,000) Net increase (decrease) in cash and cash equivalents 259,000 (162,000) 232,000 Cash and cash equivalents at beginning of year 1,028,000 1,190,000 958,000 Cash and cash equivalents at end of year $ 1,287,000 $ 1,028,000 $ 1,190,000

New Accounting Pronouncements

New Accounting Pronouncements	12 Months Ended
	Dec. 31, 2020
Accounting Policies [Abstract]
New Accounting Pronouncements	New Accounting Pronouncements In June 2016, the FASB issued Accounting Standards Update (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 anticipate 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 was effective for the Company on January 1, 2020 and has been applied prospectively. Implementation of this ASU 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. As ASU No. 2018-13 only revises disclosure requirements, it did 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.

Quarterly Information

Quarterly Information	12 Months Ended
	Dec. 31, 2020
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 2019Q1 2019Q2 2019Q3 2019Q4 2020Q1 2020Q2 2020Q3 2020Q4 Balance Sheets Cash and cash equivalents $ 15,270 $ 16,918 $ 21,418 $ 14,433 $ 21,117 $ 22,143 $ 22,742 $ 26,212 Interest-bearing deposits in other banks 231 917 16,714 11,310 6,047 21,907 48,111 56,151 Investments 606,495 625,097 625,584 642,126 654,520 653,462 672,102 678,989 Restricted equity securities 8,982 8,982 8,982 8,982 9,994 10,545 10,545 10,545 Net loans and loans held for sale 1,253,585 1,237,661 1,252,546 1,285,590 1,332,911 1,442,463 1,427,662 1,466,363 Other assets 106,782 109,124 107,983 106,355 111,807 116,604 115,464 122,976 Total assets $ 1,991,345 $ 1,998,699 $ 2,033,227 $ 2,068,796 $ 2,136,396 $ 2,267,124 $ 2,296,626 $ 2,361,236 Deposits $ 1,606,875 $ 1,592,956 $ 1,623,290 $ 1,650,466 $ 1,644,612 $ 1,740,121 $ 1,763,059 $ 1,844,611 Borrowed funds 170,419 181,858 181,417 184,955 248,040 278,805 283,787 262,038 Other liabilities 16,264 19,292 20,031 20,867 28,487 31,614 30,340 30,861 Shareholders' equity 197,787 204,593 208,489 212,508 215,257 216,584 219,440 223,726 Total liabilities $ 1,991,345 $ 1,998,699 $ 2,033,227 $ 2,068,796 $ 2,136,396 $ 2,267,124 $ 2,296,626 $ 2,361,236 Income and Comprehensive Income Statements Interest income $ 19,268 $ 19,822 $ 19,904 $ 19,657 $ 20,694 $ 18,786 $ 18,506 $ 19,133 Interest expense 6,369 6,872 6,678 6,239 5,776 4,295 3,761 3,454 Net interest income 12,899 12,950 13,226 13,418 14,918 14,491 14,745 15,679 Provision for 375 250 250 375 400 2,350 1,800 1,500 Net interest income after provision for loan losses 12,524 12,700 12,976 13,043 14,518 12,141 12,945 14,179 Non-interest income 3,144 3,605 3,532 3,908 4,221 4,601 4,805 4,492 Non-interest expense 8,398 8,730 9,040 9,004 11,043 8,917 9,276 10,416 Income before taxes 7,270 7,575 7,468 7,947 7,696 7,825 8,474 8,255 Income taxes 1,114 1,180 1,180 1,261 1,201 1,256 1,379 1,285 Net income $ 6,156 $ 6,395 $ 6,288 $ 6,686 $ 6,495 $ 6,569 $ 7,095 $ 6,970 Basic earnings per share $ 0.57 $ 0.59 $ 0.58 $ 0.62 $ 0.60 $ 0.61 $ 0.65 $ 0.64 Diluted earnings per share $ 0.57 $ 0.59 $ 0.58 $ 0.60 $ 0.60 $ 0.60 $ 0.65 $ 0.63 Other comprehensive income (loss), net of tax Net unrealized gain (loss) on securities available for sale $ 3,512 $ 4,289 $ 936 $ (29) $ 4,233 $ (790) $ (1,580) $ (511) Net unrealized gain on securities transferred from available for sale to held to maturity 3 4 1 7 8 28 7 6 Net unrealized gain (loss) on cash flow hedging derivative instruments (465) (898) (340) 362 (4,870) (1,414) 387 868 Unrecognized gain (loss) on postretirement benefit costs — — — (13) — — — 4 Other comprehensive income (loss) $ 3,050 $ 3,395 $ 597 $ 327 $ (629) $ (2,176) $ (1,186) $ 367 Comprehensive income $ 9,206 $ 9,790 $ 6,885 $ 7,013 $ 5,866 $ 4,393 $ 5,909 $ 7,337

Acquisitions and Intangible Ass

Acquisitions and Intangible Assets	12 Months Ended
	Dec. 31, 2020
Business Combinations [Abstract]
Acquisitions and Intangible Assets	Acquisitions and Intangible Assets On December 11, 2020, the Company acquired a branch at 1B Belmont Avenue, Belfast, Maine from Bangor Savings Bank. The acquisition adds to its existing book of business in Belfast and Waldo County. The Company intends to leverage having a physical presence in Belfast and the base of new customers to grow its loan and deposit share in the market. Under the terms of the acquisition, the Company acquired approximately $19,000,000 in deposits as well as $23,000,000 in loans. The following table summarizes the consideration paid for the branch and the allocation to the assets acquired and liabilities assumed based on estimates of fair value at the acquisition date: Assets Cash $ 381,000 Loans & accrued interest 23,138,000 Premises and equipment 696,000 Prepaid expenses 10,000 Core deposit intangible 262,000 Goodwill 841,000 Liabilities Deposits $ 19,261,000 Other liabilities 7,000 The banking facilities were valued at a recent appraised value, which approximates fair value. The loans acquired were recorded at fair value at the time of acquisition. The estimated fair value of the loans acquired is equal to the carrying value. At time of acquisition, all the loans are expected to be collectible. The excess of the purchase price over the fair value of the assets acquired and liabilities assumed totaled $841,000 and was recorded as goodwill. The amount of goodwill that is expected to be deductible for income taxes purposes is $841,000. The fair value of intangible assets related to core deposit accounts assumed was $262,000. The core deposit intangible is subject to amortization over the estimated ten As part of the branch acquisition, the Company entered into a lease agreement for land upon which the branch is situated. The Company recorded a right of use asset and lease liability for $511,000. One-time costs associated with the acquisition that were recognized by the Company and included in the consolidated statements of income and comprehensive income for 2020 were $310,000. The core deposit intangible related to the FNB Bankshares acquisition was fully amortized in 2015. The core deposit intangible related to the Rockland branch acquisition is being amortized on a straight-line basis over ten years. Annual amortization expense for each of 2020, 2019 and 2018 was $43,000, and the amortization expense for each year until fully amortized (presently expected to be 2022) will be $43,000. Core deposit intangible is being amortized on a straight-line basis as the Company does not expect significant run off in the core deposits.

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2020
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, 2020 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
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 ("TDR") loans and loans placed on non-accrual status when, based on current information and events, it is probable that the Bank will be unable to collect all amounts due according to the contractual terms of the loan agreement. These loans are measured at the present value of expected future cash flows discounted at the loan's effective interest rate or at the fair value of the collateral if the loan is collateral dependent. Management takes into consideration impaired loans in addition to the above mentioned factors in determining the appropriate level of allowance for loan losses.
Troubled Debt Restructured	Troubled Debt RestructuredA restructuring of debt constitutes a TDR 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. Regulatory guidance issued in March 2020 in response to the consequences of the COVID-19 pandemic, and the CARES Act passed shortly thereafter, granted exemption to TDR classification for certain qualified loan modification actions that normally would have been classified as TDRs.
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 AssetsIntangible assets include the excess of the purchase price over the fair value of net assets acquired (goodwill) from the acquisitions of FNB Bankshares in 2005, a bank branch in Rockland, Maine and bank building in Bangor, Maine in 2012, and a bank branch in Belfast, Maine in 2020, as well as the core deposit intangible related to the respective acquisitions. The Company annually evaluates goodwill, and periodically evaluates other intangible assets, for impairment. At December 31, 2020, the Company determined goodwill and other intangible assets were not impaired.
Income Taxes	Income TaxesDeferred tax assets and liabilities are recognized for the future tax consequences attributable to differences between financial statement carrying amounts of assets and liabilities and their respective tax bases, and for tax credits that are available to offset future taxable income. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which those temporary differences are expected to be recovered or settled. The effect of a change in tax rates on deferred tax assets and liabilities is recognized in income in the period the change is enacted
Loan Servicing	Loan Servicing Servicing rights are recognized when they are acquired through sale of loans. Capitalized servicing rights are reported in other assets and are amortized into non-interest income in proportion to, and over the period of, the estimated future net servicing income of the underlying financial assets. Servicing rights are evaluated for impairment based upon the fair value of the rights as compared to amortized cost. Impairment is determined by stratifying rights by predominant characteristics, such as interest rates and terms. Impairment is recognized through a valuation allowance for an individual stratum, to the extent that fair value is less than the capitalized amount for the stratum.
Post-Retirement Benefits	Post-Retirement Benefits The cost of providing post-retirement benefits is accrued during the active service period of the employee or director.
Earnings Per Share	Earnings Per Share Basic earnings per share data are based on the weighted average number of common shares outstanding during each year. Diluted earnings per share gives effect to restricted stock granted and stock options and warrants outstanding, determined by the treasury stock method.
Comprehensive Income (Loss)	Comprehensive Income (Loss) Comprehensive income (loss) includes net income and other comprehensive income (loss), which is comprised of the change in unrealized gains and losses on securities available for sale, net of tax, change in unrealized 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 InstrumentsThe 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.
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, 2020 and 2019, 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	ReclassificationsCertain 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 In June 2016, the FASB issued Accounting Standards Update (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 anticipate 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 was effective for the Company on January 1, 2020 and has been applied prospectively. Implementation of this ASU 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. As ASU No. 2018-13 only revises disclosure requirements, it did 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.

Investment Securities (Tables)

Investment Securities (Tables)	12 Months Ended
	Dec. 31, 2020
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, 2020 and 2019: Amortized Unrealized Unrealized Fair Value As of December 31, 2020 Cost Gains Losses (Estimated) Securities available for sale U.S. government-sponsored agencies $ 23,045,000 $ — $ (315,000) $ 22,730,000 Mortgage-backed securities 238,516,000 5,507,000 (617,000) 243,406,000 State and political subdivisions 37,752,000 1,722,000 — 39,474,000 Asset-backed securities 7,723,000 43,000 — 7,766,000 $ 307,036,000 $ 7,272,000 $ (932,000) $ 313,376,000 Securities to be held to maturity U.S. Government-sponsored agencies $ 44,149,000 $ 143,000 $ (18,000) $ 44,274,000 Mortgage-backed securities 53,594,000 736,000 (195,000) 54,135,000 State and political subdivisions 245,620,000 10,427,000 (3,000) 256,044,000 Corporate securities 22,250,000 433,000 (2,000) 22,681,000 $ 365,613,000 $ 11,739,000 $ (218,000) $ 377,134,000 Restricted equity securities Federal Home Loan Bank Stock $ 9,508,000 $ — $ — $ 9,508,000 Federal Reserve Bank Stock 1,037,000 — — 1,037,000 $ 10,545,000 $ — $ — $ 10,545,000 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
Contractual Maturities of Investment Securities	The following table summarizes the contractual maturities of investment securities at December 31, 2020: 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 $ 117,000 $ 120,000 $ 3,607,000 $ 3,641,000 Due in 1 to 5 years 17,718,000 17,915,000 30,867,000 31,792,000 Due in 5 to 10 years 49,697,000 51,001,000 183,679,000 190,153,000 Due after 10 years 239,504,000 244,340,000 147,460,000 151,548,000 $ 307,036,000 $ 313,376,000 $ 365,613,000 $ 377,134,000 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 Fair Value (Estimated) Amortized 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
Schedule of Securities Gains and Losses	The following table shows securities gains and losses for 2020, 2019 and 2018: 2020 2019 2018 Proceeds from sales of securities $ 112,179,000 $ 9,229,000 $ 459,000 Gross realized gains 1,689,000 224,000 137,000 Gross realized losses (534,000) — — Net gain $ 1,155,000 $ 224,000 $ 137,000 Related income taxes $ 243,000 $ 47,000 $ 29,000
Schedule of Temporary Impairment Losses	Information regarding securities temporarily impaired as of December 31, 2020 is summarized below: Less than 12 months 12 months or more Total Fair Unrealized Fair Unrealized Fair Unrealized As of December 31, 2020 Value Losses Value Losses Value Losses U.S. Government-sponsored agencies $ 30,212,000 $ (333,000) $ — $ — $ 30,212,000 $ (333,000) Mortgage-backed securities 65,505,000 (724,000) 3,878,000 (88,000) 69,383,000 (812,000) State and political subdivisions 855,000 (3,000) — — 855,000 (3,000) Corporate securities 2,498,000 (2,000) — — 2,498,000 (2,000) $ 99,070,000 $ (1,062,000) $ 3,878,000 $ (88,000) $ 102,948,000 $ (1,150,000) 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. 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)

Mortgage Servicing Rights (Tabl

Mortgage Servicing Rights (Tables)	12 Months Ended
	Dec. 31, 2020
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, 2020 2019 Mortgage servicing rights $ 7,299,000 $ 6,140,000 Accumulated amortization (4,985,000) (4,594,000) Amortized cost 2,314,000 1,546,000 Impairment reserve (358,000) — Carrying value $ 1,956,000 $ 1,546,000

Loans (Tables)

Loans (Tables)	12 Months Ended
	Dec. 31, 2020
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, 2020 and 2019: December 31, 2020 December 31, 2019 Commercial Real estate $ 442,121,000 29.9 % $ 372,810,000 28.7 % Construction 56,565,000 3.8 % 38,084,000 3.0 % Other 285,015,000 19.3 % 218,773,000 16.9 % Municipal 43,783,000 3.0 % 41,288,000 3.2 % Residential Term 522,070,000 35.3 % 492,455,000 37.9 % Construction 21,600,000 1.5 % 14,813,000 1.2 % Home equity line of credit 79,750,000 5.4 % 92,349,000 7.1 % Consumer 25,857,000 1.8 % 26,503,000 2.0 % Total loans $ 1,476,761,000 100.0 % $ 1,297,075,000 100.0 %
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, 2020 2019 Balance at beginning of year $ 21,134,000 $ 22,149,000 New loans 3,544,000 521,000 Repayments (3,138,000) (1,536,000) Retired director (326,000) — Balance at end of year $ 21,214,000 $ 21,134,000
Past Due Loans Aging	Information on the past-due status of loans by class of financing receivable as of December 31, 2020, is presented in the following table: 30-59 Days 60-89 Days 90+ Days All Current Total 90+ Days Commercial Real estate $ 139,000 $ 190,000 $ 226,000 $ 555,000 $ 441,566,000 $ 442,121,000 $ — Construction 13,000 — 80,000 93,000 56,472,000 56,565,000 — Other 490,000 62,000 2,082,000 2,634,000 282,381,000 285,015,000 1,464,000 Municipal — — — — 43,783,000 43,783,000 — Residential Term 540,000 1,799,000 1,616,000 3,955,000 518,115,000 522,070,000 23,000 Construction — — — — 21,600,000 21,600,000 — Home equity line of credit 1,645,000 324,000 367,000 2,336,000 77,414,000 79,750,000 — Consumer 89,000 42,000 18,000 149,000 25,708,000 25,857,000 18,000 Total $ 2,916,000 $ 2,417,000 $ 4,389,000 $ 9,722,000 $ 1,467,039,000 $ 1,476,761,000 $ 1,505,000 Information on the past-due status of loans by class of financing receivable 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
Modification Statuses by Portfolio Segment	Modification statuses by portfolio segment are summarized below: Commercial/Municipal Loan Modifications Units Percentage Balance Percentage Paid Off 61 10.0 % $ 9,027,000 4.0 % Subsequent Modification 54 9.0 % 32,724,000 14.0 % Still in Original Modification 16 3.0 % 7,244,000 3.0 % Out of Modification 470 78.0 % 189,413,000 79.0 % Total 601 100.0 % $ 238,408,000 100.0 % Residential Real Estate Modifications Units Percentage Balance Percentage Paid Off 27 7.0 % $ 5,930,000 12.0 % Subsequent Modification 154 43.0 % 19,468,000 38.0 % Still in Original Modification 27 7.0 % 2,615,000 5.0 % Out of Modification 154 43.0 % 23,553,000 45.0 % Total 362 100.0 % $ 51,566,000 100.0 % Consumer Loan Modifications Units Percentage Balance Percentage Paid Off 11 16.0 % $ 118,000 10.0 % Subsequent Modification 3 4.0 % 104,000 9.0 % Still in Original Modification 4 6.0 % 53,000 5.0 % Out of Modification 50 74.0 % 854,000 76.0 % Total 68 100.0 % $ 1,129,000 100.0 %
Nonaccrual Loans	Information on nonaccrual loans as of December 31, 2020 and 2019 is presented in the following table: As of December 31, 2020 2019 Commercial Real estate $ 543,000 $ 1,784,000 Construction 89,000 256,000 Other 1,481,000 6,534,000 Municipal — — Residential Term 3,593,000 5,899,000 Construction — — Home equity line of credit 1,015,000 2,171,000 Consumer — 5,000 Total $ 6,721,000 $ 16,649,000
Impaired Loans	Information regarding impaired loans is as follows: For the years ended December 31, 2020 2019 2018 Average investment in impaired loans $ 21,088,000 $ 31,557,000 $ 31,805,000 Interest income recognized on impaired loans, all on cash basis 478,000 735,000 864,000 As of December 31, 2020 2019 Balance of impaired loans $ 16,039,000 $ 29,274,000 Less portion for which no allowance for loan losses is allocated (12,098,000) (18,212,000) Portion of impaired loan balance for which an allowance for loan losses is allocated $ 3,941,000 $ 11,062,000 Portion of allowance for loan losses allocated to the impaired loan balance $ 462,000 $ 2,213,000
Impaired Loans by class of financing receivable	A breakdown of impaired loans by class of financing receivable as of December 31, 2020, is presented in the following table: Recorded Investment Unpaid Related Allowance Average Recognized Interest With No Related Allowance Commercial Real estate $ 2,060,000 $ 2,368,000 $ — $ 4,123,000 $ 127,000 Construction 89,000 89,000 — 358,000 — Other 1,591,000 1,623,000 — 999,000 15,000 Municipal — — — — — Residential Term 7,335,000 8,629,000 — 8,773,000 193,000 Construction — — — — — Home equity line of credit 1,015,000 1,089,000 — 1,219,000 — Consumer 8,000 8,000 — 1,000 1,000 $ 12,098,000 $ 13,806,000 $ — $ 15,473,000 $ 336,000 With an Allowance Recorded Commercial Real estate $ 969,000 $ 995,000 $ 112,000 $ 1,018,000 $ 43,000 Construction 681,000 681,000 18,000 579,000 30,000 Other 188,000 202,000 169,000 1,193,000 3,000 Municipal — — — — — Residential Term 2,079,000 2,134,000 163,000 2,073,000 65,000 Construction — — — — — Home equity line of credit 24,000 24,000 — 744,000 1,000 Consumer — — — 8,000 — $ 3,941,000 $ 4,036,000 $ 462,000 $ 5,615,000 $ 142,000 Total Commercial Real estate $ 3,029,000 $ 3,363,000 $ 112,000 $ 5,141,000 $ 170,000 Construction 770,000 770,000 18,000 937,000 30,000 Other 1,779,000 1,825,000 169,000 2,192,000 18,000 Municipal — — — — — Residential Term 9,414,000 10,763,000 163,000 10,846,000 258,000 Construction — — — — — Home equity line of credit 1,039,000 1,113,000 — 1,963,000 1,000 Consumer 8,000 8,000 — 9,000 1,000 $ 16,039,000 $ 17,842,000 $ 462,000 $ 21,088,000 $ 478,000 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 class of financing receivable as of December 31, 2019, is presented in the following table: Recorded Investment Unpaid Related Allowance Average Recognized Interest 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 A breakdown of impaired loans by category as of December 31, 2018, is presented in the following table: Recorded Investment Unpaid Related Allowance Average Recognized Interest 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
Troubled Debt Restructurings on Financing Receivables	The following table shows TDRs by class and the specific reserve as of December 31, 2020: Number of Loans Balance Specific Reserves Commercial Real estate 13 $ 2,558,000 $ 106,000 Construction 1 681,000 18,000 Other 6 717,000 96,000 Municipal — — — Residential Term 51 7,384,000 149,000 Construction — — — Home equity line of credit 2 186,000 — Consumer 1 8,000 — 74 $ 11,534,000 $ 369,000 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 As of December 31, 2020, 14 of the loans classified as TDRs with a total balance of $1,577,000 were more than 30 days past due. One 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, 2020: Number of Loans Balance Specific Reserves Commercial Real estate — $ — $ — Construction — — — Other 4 419,000 92,000 Municipal — — — Residential Term 8 988,000 5,000 Construction — — — Home equity line of credit 1 162,000 — Consumer 1 8,000 — 14 $ 1,577,000 $ 97,000 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 For the year ended December 31, 2020, three 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, 2020: Number of Loans Pre-Modification Post-Modification Outstanding Specific Reserves Commercial Real estate — $ — $ — — Construction — — — — Other — — — — Municipal — — — — Residential Term 2 234,000 185,000 21,000 Construction — — — — Home equity line of credit — — — — Consumer 1 8,000 8,000 — 3 $ 242,000 $ 193,000 21,000 For the year ended December 31, 2019, 11 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, 2019. Number of Loans Pre-Modification Post-Modification Outstanding 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

Allowance for Loan Losses (Tabl

Allowance for Loan Losses (Tables)	12 Months Ended
	Dec. 31, 2020
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, 2020 and 2019: As of December 31, 2020 2019 Allowance for Loans Evaluated Individually for Impairment Commercial Real estate $ 112,000 $ 251,000 Construction 18,000 — Other 169,000 1,273,000 Municipal — — Residential Term 163,000 237,000 Construction — — Home equity line of credit — 447,000 Consumer — 5,000 Total $ 462,000 $ 2,213,000 Allowance for Loans Evaluated Collectively for Impairment Commercial Real estate $ 5,066,000 $ 3,491,000 Construction 644,000 365,000 Other 3,269,000 2,056,000 Municipal 171,000 27,000 Residential Term 2,416,000 787,000 Construction 102,000 25,000 Home equity line of credit 1,211,000 631,000 Consumer 778,000 862,000 Unallocated 2,134,000 1,182,000 Total $ 15,791,000 $ 9,426,000 Total Allowance for Loan Losses Commercial Real estate $ 5,178,000 $ 3,742,000 Construction 662,000 365,000 Other 3,438,000 3,329,000 Municipal 171,000 27,000 Residential Term 2,579,000 1,024,000 Construction 102,000 25,000 Home equity line of credit 1,211,000 1,078,000 Consumer 778,000 867,000 Unallocated 2,134,000 1,182,000 Total $ 16,253,000 $ 11,639,000
Loan losses by loan segment and allowance element	A breakdown of the allowance for loan losses as of December 31, 2020 and 2019, by class of financing receivable and allowance element, is presented in the following tables: As of December 31, 2020 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 $ 112,000 $ 721,000 $ 4,345,000 $ — $ 5,178,000 Construction 18,000 92,000 552,000 — 662,000 Other 169,000 465,000 2,804,000 — 3,438,000 Municipal — — 171,000 — 171,000 Residential Term 163,000 145,000 2,271,000 — 2,579,000 Construction — 6,000 96,000 — 102,000 Home equity line of credit — 151,000 1,060,000 — 1,211,000 Consumer — 282,000 496,000 — 778,000 Unallocated — — — 2,134,000 2,134,000 $ 462,000 $ 1,862,000 $ 11,795,000 $ 2,134,000 $ 16,253,000 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
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, 2020: Commercial Commercial Commercial Municipal All Risk- 1 Strong $ — $ — $ 2,402,000 $ 19,000 $ 2,421,000 2 Above average 5,938,000 2,343,000 6,326,000 41,939,000 56,546,000 3 Satisfactory 91,475,000 2,889,000 104,432,000 369,000 199,165,000 4 Average 261,539,000 31,221,000 120,570,000 1,456,000 414,786,000 5 Watch 72,840,000 19,893,000 44,293,000 — 137,026,000 6 OAEM 2,754,000 — 234,000 — 2,988,000 7 Substandard 7,575,000 219,000 6,758,000 — 14,552,000 8 Doubtful — — — — — Total $ 442,121,000 $ 56,565,000 $ 285,015,000 $ 43,783,000 $ 827,484,000 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, 2019: Commercial Commercial Commercial Municipal All Risk- 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
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, 2020, 2019 and 2018: For the year ended December 31, 2020 Commercial Residential Home Equity Real Estate Construction Other Municipal Term Construction Consumer Unallocated Total Allowance for loan losses: Beginning 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 Chargeoffs 1,088,000 — 27,000 — 66,000 — 153,000 327,000 — 1,661,000 Recoveries — — 37,000 — 34,000 — 22,000 132,000 — 225,000 Provision 2,524,000 297,000 99,000 144,000 1,587,000 77,000 264,000 106,000 952,000 6,050,000 Ending balance $ 5,178,000 $ 662,000 $ 3,438,000 $ 171,000 $ 2,579,000 $ 102,000 $ 1,211,000 $ 778,000 $ 2,134,000 $ 16,253,000 Ending balance specifically evaluated for impairment $ 112,000 $ 18,000 $ 169,000 $ — $ 163,000 $ — $ — $ — $ — $ 462,000 Ending balance collectively evaluated for impairment $ 5,066,000 $ 644,000 $ 3,269,000 $ 171,000 $ 2,416,000 $ 102,000 $ 1,211,000 $ 778,000 $ 2,134,000 $ 15,791,000 Related loan balances: Ending balance $ 442,121,000 $ 56,565,000 $ 285,015,000 $ 43,783,000 $ 522,070,000 $ 21,600,000 $ 79,750,000 $ 25,857,000 $ — $ 1,476,761,000 Ending balance specifically evaluated for impairment $ 3,029,000 $ 770,000 $ 1,779,000 $ — $ 9,414,000 $ — $ 1,039,000 $ 8,000 $ — $ 16,039,000 Ending balance collectively evaluated for impairment $ 439,092,000 $ 55,795,000 $ 283,236,000 $ 43,783,000 $ 512,656,000 $ 21,600,000 $ 78,711,000 $ 25,849,000 $ — $ 1,460,722,000 For the year ended December 31, 2019 Commercial Residential Home Equity 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 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

Premises and Equipment (Tables)

Premises and Equipment (Tables)	12 Months Ended
	Dec. 31, 2020
Property, Plant and Equipment [Abstract]
Premises and Equipment	Premises and equipment are carried at cost and consist of the following: As of December 31, 2020 2019 Land $ 6,178,000 $ 5,100,000 Land improvements 1,710,000 1,100,000 Buildings 28,067,000 21,946,000 Equipment 11,878,000 12,858,000 47,833,000 41,004,000 Less accumulated depreciation 20,582,000 19,699,000 Total premises and equipment $ 27,251,000 $ 21,305,000
Schedule of Anticipated Rental Revenue	Future minimum receipts under lease agreements at December 31, 2020 by year and in the aggregate are: 2021 $129,000 2022 125,000 2023 41,000 2024 16,000 $311,000
Right-of-use Asset and Lease Liability	The right‑of‑use asset and lease liability by lease type, and the associated balance sheet classifications as of December 31, 2020 were as follows: Balance Sheet Classification Right-of-use assets: Operating leases Premises and equipment, net $511,000 Lease liabilities: Operating leases Other liabilities $511,000
Future Lease Payments for Operating Leases	Future lease payments for operating leases with initial terms of one year or more as of December 31, 2020 are as follows: 2021 $28,000 2022 28,000 2023 28,000 2024 28,000 2025 28,000 Thereafter 486,000 Total undiscounted lease payments 626,000 Less: imputed interest 115,000 Net lease liability $511,000

Other Real Estate Owned (Tables

Other Real Estate Owned (Tables)	12 Months Ended
	Dec. 31, 2020
Real Estate Owned, Disclosure of Detailed Components [Abstract]
Other Real Estate Owned	The following summarizes other real estate owned: As of December 31, 2020 2019 Real estate acquired in settlement of loans $ 908,000 $ 279,000
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, 2020 2019 2018 Balance at beginning of year $ — $ — $ 53,000 Losses charged to allowance — — (53,000) Provision charged to operating expenses 45,000 — — Balance at end of year $ 45,000 $ — $ —

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2020
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, 2020 2019 2018 Federal income tax Current $ 4,923,000 $ 3,978,000 $ 4,407,000 Deferred (262,000) 336,000 (492,000) 4,661,000 4,314,000 3,915,000 State franchise tax 460,000 421,000 391,000 $ 5,121,000 $ 4,735,000 $ 4,306,000
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, 2020 2019 2018 Expected tax expense $ 6,773,000 $ 6,355,000 $ 5,847,000 Non-taxable income (1,808,000) (1,749,000) (1,699,000) State franchise tax, net of federal tax benefit 348,000 332,000 309,000 Equity compensation (43,000) (45,000) (55,000) Tax credits, net of amortization (144,000) (85,000) (85,000) Other (5,000) (73,000) (11,000) $ 5,121,000 $ 4,735,000 $ 4,306,000
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, 2020 and 2019 are as follows: 2020 2019 Allowance for loan losses $ 3,413,000 $ 2,444,000 OREO 9,000 — Accrued pension and post-retirement 948,000 926,000 Unrealized loss on derivative instruments 1,865,000 345,000 Unrealized loss on securities transferred from available for sale to held to maturity 35,000 48,000 Restricted stock grants 270,000 203,000 Core deposit intangible 24,000 21,000 Investment in flow through entities 82,000 55,000 Other assets 87,000 — Total deferred tax asset 6,733,000 4,042,000 Net deferred loan costs (1,894,000) (1,669,000) Depreciation (2,013,000) (1,434,000) Unrealized gain on securities available for sale (1,332,000) (972,000) Goodwill (161,000) (120,000) Mortgage servicing rights (411,000) (325,000) Unrealized gain on derivative instruments (554,000) (371,000) Prepaid expense (195,000) (205,000) Total deferred tax liability (6,560,000) (5,096,000) Net deferred tax asset (liability) $ 173,000 $ (1,054,000)

Certificates of Deposit (Tables

Certificates of Deposit (Tables)	12 Months Ended
	Dec. 31, 2020
Deposits [Abstract]
Certificates of deposit	The following table represents the breakdown of certificates of deposit at December 31, 2020 and 2019: December 31, 2020 December 31, 2019 Certificates of deposit < $100,000 $ 246,875,000 $ 277,225,000 Certificates $100,000 to $250,000 295,672,000 345,241,000 Certificates $250,000 and over 63,038,000 67,513,000 $ 605,585,000 $ 689,979,000
Maturities of certificates of deposit	At December 31, 2020, 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 2021 $ 205,853,000 $ 294,486,000 $ 500,339,000 2022 16,889,000 21,411,000 38,300,000 2023 14,064,000 33,119,000 47,183,000 2024 4,562,000 4,926,000 9,488,000 2025 5,363,000 4,768,000 10,131,000 2026 and thereafter 144,000 — 144,000 $ 246,875,000 $ 358,710,000 $ 605,585,000

Borrowed Funds (Tables)

Borrowed Funds (Tables)	12 Months Ended
	Dec. 31, 2020
Borrowed Funds [Abstract]
Range of Interest Rates and Maturity Dates of Borrowed Funds	Borrowed funds at December 31, 2020 and 2019 have the following range of interest rates and maturity dates: As of December 31, 2020 Federal Home Loan Bank Advances and Federal Reserve Bank Borrowings 2021 0.00% - 1.55% $ 137,600,000 2022 0.00% — 2023 0.00% — 2024 0.00% 98,000 2025 1.35% - 1.40% 55,000,000 2026 and thereafter 0.00% — 192,698,000 Repurchase agreements Municipal and commercial customers 0.10% - 2.00% 69,340,000 $ 262,038,000 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

Employee Benefit Plans (Tables)

Employee Benefit Plans (Tables)	12 Months Ended
	Dec. 31, 2020
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, 2020 2019 2018 Change in benefit obligations Benefit obligation at beginning of year: $ 1,581,000 $ 1,599,000 $ 1,874,000 Interest cost 46,000 66,000 77,000 Benefits paid (97,000) (97,000) (117,000) Actuarial (gain) loss (7,000) 13,000 (235,000) Benefit obligation at end of year: $ 1,523,000 $ 1,581,000 $ 1,599,000 Funded status Benefit obligation at end of year $ (1,523,000) $ (1,581,000) $ (1,599,000) Unamortized gain (35,000) (31,000) (47,000) Accrued benefit cost $ (1,558,000) $ (1,612,000) $ (1,646,000) Weighted average discount rate as of December 31 2.00 % 3.00 % 4.25 %
Schedule of net benefit costs	The following table sets forth the net periodic benefit cost: For the years ended December 31, 2020 2019 2018 Components of net periodic benefit cost Interest cost $ 46,000 $ 66,000 $ 77,000 Amortization of loss — — — Other settlement income (2,000) (2,000) (3,000) Net periodic benefit cost $ 44,000 $ 64,000 $ 74,000 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, 2020 2019 Portion to Be Recognized in Unamortized net actuarial gain $ 35,000 $ 31,000 $ — Deferred tax expense at 21% (7,000) (7,000) — Net unrecognized post-retirement benefits included in accumulated other comprehensive income $ 28,000 $ 24,000 $ —

Other Comprehensive Income (L_2

Other Comprehensive Income (Loss) (Tables)	12 Months Ended
	Dec. 31, 2020
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, 2020, 2019 and 2018. For the years ended December 31, 2020 2019 2018 Balance at beginning of year $ 3,657,000 $ (5,051,000) $ (2,901,000) Unrealized gains (losses) arising during the year 2,866,000 11,247,000 (2,585,000) Reclassification of realized gains during the year (1,155,000) (224,000) (137,000) Related deferred taxes (359,000) (2,315,000) 572,000 Net change 1,352,000 8,708,000 (2,150,000) Balance at end of year $ 5,009,000 $ 3,657,000 $ (5,051,000) 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, 2020, 2019, and 2018. For the years ended December 31, 2020 2019 2018 Balance at beginning of year $ (182,000) $ (197,000) $ (174,000) Amortization of net unrealized gains (losses) 62,000 19,000 (29,000) Related deferred taxes (13,000) (4,000) 6,000 Net change 49,000 15,000 (23,000) Balance at end of year $ (133,000) $ (182,000) $ (197,000) 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, 2020, 2019, and 2018. For the years ended December 31, 2020 2019 2018 Balance at beginning of year $ 97,000 $ 1,438,000 $ 1,544,000 Unrealized losses on cash flow hedging derivatives arising during the year (6,366,000) (1,697,000) (134,000) Related deferred taxes 1,337,000 356,000 28,000 Net change (5,029,000) (1,341,000) (106,000) Balance at end of year $ (4,932,000) $ 97,000 $ 1,438,000 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, 2020, 2019, and 2018: For the years ended December 31, 2020 2019 2018 Unrecognized postretirement benefits at beginning of year $ 24,000 $ 37,000 $ (147,000) Change in unamortized net actuarial gain (loss) 5,000 (16,000) 233,000 Related deferred taxes (1,000) 3,000 (49,000) Net change 4,000 (13,000) 184,000 Unrecognized postretirement benefits at end of year $ 28,000 $ 24,000 $ 37,000

Financial Derivative Instrume_2

Financial Derivative Instruments (Tables)	12 Months Ended
	Dec. 31, 2020
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule of Derivative Instruments	The details of the interest rate swap agreements are as follows: December 31, 2020 December 31, 2019 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 Liabilities (Assets) $ 20,000,000 $ (76,000) $ 20,000,000 $ 199,000 06/28/16 06/28/21 1-Month USD LIBOR 0.940 % Other Liabilities (Assets) 30,000,000 (121,000) 30,000,000 278,000 06/05/18 06/05/20 1-Month USD LIBOR 2.547 % Other Liabilities — — 25,000,000 (96,000) 06/05/18 12/05/20 1-Month USD LIBOR 2.603 % Other Liabilities — — 25,000,000 (234,000) 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 (626,000) 12,500,000 (11,000) 08/05/19 08/05/24 1-Month USD LIBOR 1.420 % Other Liabilities (Assets) 12,500,000 (550,000) 12,500,000 85,000 02/12/20 02/12/23 3-Month USD LIBOR 1.486 % Other Liabilities 25,000,000 (695,000) — — 02/12/20 02/12/24 3-Month USD LIBOR 1.477 % Other Liabilities 25,000,000 (972,000) — — 06/28/21 06/28/26 1-Month USD LIBOR 1.158 % Other Liabilities 50,000,000 (1,872,000) — — 03/13/20 03/13/25 3-Month USD LIBOR 0.855 % Other Liabilities 25,000,000 (551,000) — — 03/13/20 03/13/30 3-Month USD LIBOR 1.029 % Other Liabilities 20,000,000 (339,000) — — 04/07/20 04/07/23 3-Month USD LIBOR 0.599 % Other Liabilities 20,000,000 (185,000) — — 04/07/20 04/07/24 3-Month USD LIBOR 0.643 % Other Liabilities 20,000,000 (255,000) — — $ 260,000,000 $ (6,242,000) $ 150,000,000 $ 123,000 December 31, 2020 December 31, 2019 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 5 $ 32,987,000 $ (2,640,000) 2 $ 16,374,000 $ (1,205,000) Receive Fixed, Pay Variable Other Assets 5 32,987,000 2,640,000 2 16,374,000 1,205,000 Total 10 $ 65,974,000 $ — 4 $ 32,748,000 $ —

Stock Options and Stock-Based_2

Stock Options and Stock-Based Compensation (Tables)	12 Months Ended
	Dec. 31, 2020
Share-based Payment Arrangement [Abstract]
Schedule of Nonvested Restricted Stock Units Activity	As of December 31, 2020, 184,487 shares of restricted stock had been granted under the 2010 Plan and 5,750 shares under the 2020 Plan, of which 76,597 shares remain restricted as of December 31, 2020 as detailed in the following table: Year Vesting Term Shares Remaining Term 2016 5.0 10,874 0.1 2017 5.0 7,017 1.1 2018 3.0 5,371 0.1 2018 4.0 2,068 1.0 2018 5.0 6,184 2.0 2019 2.0 1,484 0.1 2019 3.0 16,254 1.1 2020 1.0 5,809 0.3 2020 2.0 694 1.1 2020 3.0 20,842 2.1 76,597 1.3

Earnings Per Share (Tables)

Earnings Per Share (Tables)	12 Months Ended
	Dec. 31, 2020
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, 2020, 2019 and 2018: Income Shares Per-Share For the year ended December 31, 2020 Net income as reported $ 27,129,000 Basic EPS: Income available to common shareholders 27,129,000 10,858,606 $ 2.50 Effect of dilutive securities: restricted stock 74,212 Diluted EPS: Income available to common shareholders plus assumed conversions $ 27,129,000 10,932,818 $ 2.48 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

Regulatory Capital Requiremen_2

Regulatory Capital Requirements (Tables)	12 Months Ended
	Dec. 31, 2020
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 To be well-capitalized As of December 31, 2020 Tier 2 capital to $ 207,461,000 $ 112,899,000 $ 141,124,000 risk-weighted assets 14.70 % 8.00 % 10.00 % Tier 1 capital to $ 191,108,000 $ 84,675,000 $ 112,899,000 risk-weighted assets 13.54 % 6.00 % 8.00 % Common equity Tier 1 capital to $ 191,108,000 $ 63,506,000 $ 91,731,000 risk-weighted assets 13.54 % 4.50 % 6.50 % Tier 1 capital to $ 191,108,000 $ 90,577,000 $ 113,221,000 average assets 8.44 % 4.00 % 5.00 % 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 % The actual and minimum capital amounts and ratios for the Company, on a consolidated basis, are presented in the following table: Actual For capital To be well-capitalized As of December 31, 2020 Tier 2 capital to $ 209,113,000 $ 112,899,000 n/a risk-weighted assets 14.82 % 8.00 % n/a Tier 1 capital to $ 192,760,000 $ 84,675,000 n/a risk-weighted assets 13.66 % 6.00 % n/a Common equity Tier 1 capital to $ 192,760,000 $ 63,506,000 n/a risk-weighted assets 13.66 % 4.50 % n/a Tier 1 capital to $ 192,760,000 $ 90,821,000 n/a average assets 8.49 % 4.00 % n/a 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

Off-Balance-Sheet Financial I_2

Off-Balance-Sheet Financial Instruments and Concentrations of Credit Risk (Tables)	12 Months Ended
	Dec. 31, 2020
Commitments and Contingencies Disclosure [Abstract]
Off-Balance-Sheet Financial instruments	At December 31, 2020 and 2019, the Bank had the following off-balance-sheet financial instruments, whose contract amounts represent credit risk: As of December 31, 2020 2019 Unused lines, collateralized by residential real estate $ 89,852,000 $ 81,193,000 Other unused commitments 102,963,000 90,186,000 Standby letters of credit 4,415,000 4,496,000 Commitments to extend credit 34,526,000 19,702,000 Total $ 231,756,000 $ 195,577,000

Fair Value Disclosures (Tables)

Fair Value Disclosures (Tables)	12 Months Ended
	Dec. 31, 2020
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, 2020 and 2019. At December 31, 2020 Level 1 Level 2 Level 3 Total Securities available for sale U.S. Government-sponsored agencies $ — $ 22,730,000 $ — $ 22,730,000 Mortgage-backed securities — 243,406,000 — 243,406,000 State and political subdivisions — 39,474,000 — 39,474,000 Asset-backed securities — 7,766,000 — 7,766,000 Total securities available for sale — 313,376,000 — 313,376,000 Customer loan interest swap agreements — 2,640,000 — 2,640,000 Total interest rate swap agreements — 2,640,000 — 2,640,000 Total assets $ — $ 316,016,000 $ — $ 316,016,000 At December 31, 2020 Level 1 Level 2 Level 3 Total Interest rate swap agreements $ — $ 6,242,000 $ — $ 6,242,000 Customer loan interest swap agreements — 2,640,000 — 2,640,000 Total liabilities $ — $ 8,882,000 $ — $ 8,882,000 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
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. Mortgage servicing rights are presented net of an impairment reserve of $358,000 at December 31, 2020 and $0 at December 31, 2019. Other real estate owned is presented net of an allowance for losses of $45,000 at December 31, 2020 and $0 at December 31, 2019. 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 $304,000 and $1,916,000 at December 31, 2020 and 2019, respectively. At December 31, 2020 Level 1 Level 2 Level 3 Total Mortgage servicing rights $ — $ 1,985,000 $ — $ 1,985,000 Other real estate owned — 908,000 — 908,000 Impaired loans — 794,000 — 794,000 Total assets $ — $ 3,687,000 $ — $ 3,687,000 At December 31, 2019 Level 1 Level 2 Level 3 Total Mortgage servicing rights $ — $ 2,089,000 $ — $ 2,089,000 Other real estate owned $ — $ 279,000 $ — $ 279,000 Impaired loans — 6,579,000 — 6,579,000 Total assets $ — $ 8,947,000 $ — $ 8,947,000
Estimated fair value of financial instruments	The carrying amounts and estimated fair values for financial instruments as of December 31, 2020 were as follows: Carrying Estimated As of December 31, 2020 value fair value Level 1 Level 2 Level 3 Financial assets Securities to be held to maturity $365,613,000 $377,134,000 $ — $377,134,000 $ — Loans (net of allowance for loan losses) Commercial Real estate 436,161,000 440,735,000 — 347,000 440,388,000 Construction 55,803,000 56,388,000 — — 56,388,000 Other 281,057,000 279,501,000 — 5,000 279,496,000 Municipal 43,586,000 44,440,000 — — 44,440,000 Residential Term 519,101,000 533,059,000 — 442,000 532,617,000 Construction 21,483,000 21,890,000 — — 21,890,000 Home equity line of credit 78,356,000 77,177,000 — — 77,177,000 Consumer 24,961,000 23,502,000 — — 23,502,000 Total loans 1,460,508,000 1,476,692,000 — 794,000 1,475,898,000 Mortgage servicing rights 1,956,000 1,985,000 — 1,985,000 — Financial liabilities Local certificates of deposit $250,264,000 $253,892,000 — $253,892,000 — National certificates of deposit 355,321,000 359,899,000 — 359,899,000 — Total certificates of deposit 605,585,000 613,791,000 — 613,791,000 — Repurchase agreements 69,340,000 69,497,000 — 69,497,000 — Other borrowed funds 192,698,000 194,469,000 — 194,469,000 — Total borrowed funds 262,038,000 263,966,000 — 263,966,000 — 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 689,979,000 693,817,000 — 693,817,000 — Repurchase agreements 37,450,000 37,450,000 — 37,450,000 — Other borrowed funds 147,505,000 140,063,000 — 140,063,000 — Total borrowed funds 184,955,000 177,513,000 — 177,513,000 —

Other Operating Income and Ex_2

Other Operating Income and Expense (Tables)	12 Months Ended
	Dec. 31, 2020
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, 2020 2019 2018 Other operating income ATM and debit card income $ 4,138,000 $ 3,956,000 $ 3,556,000 Loan processing fees 1,200,000 812,000 711,000 Other operating expense Advertising and marketing expense $ 983,000 $ 1,174,000 $ 1,165,000 Accounting and auditing expenses 788,000 828,000 837,000 ATM and interchange expense 1,253,000 1,176,000 995,000 Swap termination expense 1,756,000 — —

Condensed Financial Informati_2

Condensed Financial Information of Parent (Tables)	12 Months Ended
	Dec. 31, 2020
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, 2020 2019 Assets Cash and cash equivalents $ 1,287,000 $ 1,028,000 Dividends receivable 3,400,000 3,200,000 Investment in subsidiary 194,515,000 183,654,000 Goodwill 27,559,000 27,559,000 Other assets 360,000 337,000 Total assets $ 227,121,000 $ 215,778,000 Liabilities and shareholders' equity Dividends payable $ 3,395,000 $ 3,270,000 Other liabilities — — Total liabilities 3,395,000 3,270,000 Shareholders' equity Common stock 110,000 109,000 Additional paid-in capital 65,285,000 63,964,000 Retained earnings 158,331,000 148,435,000 Total shareholders' equity 223,726,000 212,508,000 Total liabilities and shareholders' equity $ 227,121,000 $ 215,778,000 Statements of Income For the years ended December 31, 2020 2019 2018 Net securities gains $ — $ — $ 137,000 Other operating income 8,000 — — Total income 8,000 — 137,000 Occupancy expense — 1,000 2,000 Other operating expense 911,000 826,000 652,000 Total expense 911,000 827,000 654,000 Loss before income taxes and Bank earnings (903,000) (827,000) (517,000) Applicable income taxes (246,000) (230,000) (164,000) Loss before Bank earnings (657,000) (597,000) (353,000) Equity in earnings of Bank Remitted 13,300,000 12,600,000 11,300,000 Unremitted 14,486,000 13,522,000 12,589,000 Net income $ 27,129,000 $ 25,525,000 $ 23,536,000 Statements of Cash Flows For the years ended December 31, 2020 2019 2018 Cash flows from operating activities: Net income $ 27,129,000 $ 25,525,000 $ 23,536,000 Adjustments to reconcile net income to net cash provided by operating activities: Depreciation — 2,000 — Equity compensation expense 652,000 565,000 381,000 Gain on sale of investments — — (137,000) (Increase) decrease in other assets (21,000) (105,000) 81,000 Increase in dividends receivable (200,000) (250,000) (450,000) Increase in dividends payable — 120,000 551,000 Decrease in other liabilities — (4,000) — Unremitted earnings of Bank (14,486,000) (13,522,000) (12,589,000) Net cash provided by operating activities 13,074,000 12,331,000 11,373,000 Cash flows from investing activities: Proceeds from sales/maturities of investments — — 459,000 Capital expenditures — — 1,000 Net cash provided by investing activities — — 460,000 Cash flows from financing activities: Purchase of common stock (156,000) (183,000) (168,000) Proceeds from sale of common stock 670,000 653,000 619,000 Dividends paid (13,329,000) (12,963,000) (12,052,000) Net cash used in financing activities (12,815,000) (12,493,000) (11,601,000) Net increase (decrease) in cash and cash equivalents 259,000 (162,000) 232,000 Cash and cash equivalents at beginning of year 1,028,000 1,190,000 958,000 Cash and cash equivalents at end of year $ 1,287,000 $ 1,028,000 $ 1,190,000

Quarterly Information (Tables)

Quarterly Information (Tables)	12 Months Ended
	Dec. 31, 2020
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 2019Q1 2019Q2 2019Q3 2019Q4 2020Q1 2020Q2 2020Q3 2020Q4 Balance Sheets Cash and cash equivalents $ 15,270 $ 16,918 $ 21,418 $ 14,433 $ 21,117 $ 22,143 $ 22,742 $ 26,212 Interest-bearing deposits in other banks 231 917 16,714 11,310 6,047 21,907 48,111 56,151 Investments 606,495 625,097 625,584 642,126 654,520 653,462 672,102 678,989 Restricted equity securities 8,982 8,982 8,982 8,982 9,994 10,545 10,545 10,545 Net loans and loans held for sale 1,253,585 1,237,661 1,252,546 1,285,590 1,332,911 1,442,463 1,427,662 1,466,363 Other assets 106,782 109,124 107,983 106,355 111,807 116,604 115,464 122,976 Total assets $ 1,991,345 $ 1,998,699 $ 2,033,227 $ 2,068,796 $ 2,136,396 $ 2,267,124 $ 2,296,626 $ 2,361,236 Deposits $ 1,606,875 $ 1,592,956 $ 1,623,290 $ 1,650,466 $ 1,644,612 $ 1,740,121 $ 1,763,059 $ 1,844,611 Borrowed funds 170,419 181,858 181,417 184,955 248,040 278,805 283,787 262,038 Other liabilities 16,264 19,292 20,031 20,867 28,487 31,614 30,340 30,861 Shareholders' equity 197,787 204,593 208,489 212,508 215,257 216,584 219,440 223,726 Total liabilities $ 1,991,345 $ 1,998,699 $ 2,033,227 $ 2,068,796 $ 2,136,396 $ 2,267,124 $ 2,296,626 $ 2,361,236 Income and Comprehensive Income Statements Interest income $ 19,268 $ 19,822 $ 19,904 $ 19,657 $ 20,694 $ 18,786 $ 18,506 $ 19,133 Interest expense 6,369 6,872 6,678 6,239 5,776 4,295 3,761 3,454 Net interest income 12,899 12,950 13,226 13,418 14,918 14,491 14,745 15,679 Provision for 375 250 250 375 400 2,350 1,800 1,500 Net interest income after provision for loan losses 12,524 12,700 12,976 13,043 14,518 12,141 12,945 14,179 Non-interest income 3,144 3,605 3,532 3,908 4,221 4,601 4,805 4,492 Non-interest expense 8,398 8,730 9,040 9,004 11,043 8,917 9,276 10,416 Income before taxes 7,270 7,575 7,468 7,947 7,696 7,825 8,474 8,255 Income taxes 1,114 1,180 1,180 1,261 1,201 1,256 1,379 1,285 Net income $ 6,156 $ 6,395 $ 6,288 $ 6,686 $ 6,495 $ 6,569 $ 7,095 $ 6,970 Basic earnings per share $ 0.57 $ 0.59 $ 0.58 $ 0.62 $ 0.60 $ 0.61 $ 0.65 $ 0.64 Diluted earnings per share $ 0.57 $ 0.59 $ 0.58 $ 0.60 $ 0.60 $ 0.60 $ 0.65 $ 0.63 Other comprehensive income (loss), net of tax Net unrealized gain (loss) on securities available for sale $ 3,512 $ 4,289 $ 936 $ (29) $ 4,233 $ (790) $ (1,580) $ (511) Net unrealized gain on securities transferred from available for sale to held to maturity 3 4 1 7 8 28 7 6 Net unrealized gain (loss) on cash flow hedging derivative instruments (465) (898) (340) 362 (4,870) (1,414) 387 868 Unrecognized gain (loss) on postretirement benefit costs — — — (13) — — — 4 Other comprehensive income (loss) $ 3,050 $ 3,395 $ 597 $ 327 $ (629) $ (2,176) $ (1,186) $ 367 Comprehensive income $ 9,206 $ 9,790 $ 6,885 $ 7,013 $ 5,866 $ 4,393 $ 5,909 $ 7,337

Acquisitions and Intangible A_2

Acquisitions and Intangible Assets (Tables)	12 Months Ended
	Dec. 31, 2020
Business Combinations [Abstract]
Summary of Consideration Paid	The following table summarizes the consideration paid for the branch and the allocation to the assets acquired and liabilities assumed based on estimates of fair value at the acquisition date: Assets Cash $ 381,000 Loans & accrued interest 23,138,000 Premises and equipment 696,000 Prepaid expenses 10,000 Core deposit intangible 262,000 Goodwill 841,000 Liabilities Deposits $ 19,261,000 Other liabilities 7,000

Summary of Significant Accoun_3

Summary of Significant Accounting Policies (Details)	12 Months Ended
	Dec. 31, 2020limitedPartnership
Accounting Policies [Abstract]
Number of reportable operating segments	1

Cash and Cash Equivalents (Deta

Cash and Cash Equivalents (Details)	Dec. 31, 2020USD ($)
Cash and Cash Equivalents [Abstract]
Contractual clearing balance	$ 500,000
Cash held in Reserve at Federal Reserve Bank	$ 0

Investment Securities - Summary

Investment Securities - Summary of Amortized Cost and Estimated Fair Value, AFS (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 307,036	$ 355,890
Unrealized Gains	7,272	5,565
Unrealized Losses	(932)	(935)
Fair Value (Estimated)	313,376	360,520
U.S. government-sponsored agencies
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	23,045	7,500
Unrealized Gains	0	0
Unrealized Losses	(315)	(102)
Fair Value (Estimated)	22,730	7,398
Mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	238,516	323,277
Unrealized Gains	5,507	4,173
Unrealized Losses	(617)	(833)
Fair Value (Estimated)	243,406	326,617
State and political subdivisions
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	37,752	25,113
Unrealized Gains	1,722	1,392
Unrealized Losses	0	0
Fair Value (Estimated)	39,474	$ 26,505
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	7,723
Unrealized Gains	43
Unrealized Losses	0
Fair Value (Estimated)	$ 7,766

Investment Securities - Summa_2

Investment Securities - Summary of Amortized Cost and Estimated Fair Value, HTM and Restricted Equity Securities (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Securities to be held to maturity, cost and FMV [Abstract]
Amortized Cost	$ 365,613	$ 281,606
Unrealized Gains	11,739	5,590
Unrealized Losses	(218)	(151)
Fair Value (Estimated)	377,134	287,045
Restricted equity securities
Federal Home Loan Bank Stock	9,508	7,945
Federal Reserve Bank Stock	1,037	1,037
Restricted equity securities	10,545	8,982
U.S. government-sponsored agencies
Securities to be held to maturity, cost and FMV [Abstract]
Amortized Cost	44,149	32,840
Unrealized Gains	143	47
Unrealized Losses	(18)	(26)
Fair Value (Estimated)	44,274	32,861
Mortgage-backed securities
Securities to be held to maturity, cost and FMV [Abstract]
Amortized Cost	53,594	14,431
Unrealized Gains	736	450
Unrealized Losses	(195)	(16)
Fair Value (Estimated)	54,135	14,865
State and political subdivisions
Securities to be held to maturity, cost and FMV [Abstract]
Amortized Cost	245,620	219,585
Unrealized Gains	10,427	4,936
Unrealized Losses	(3)	(109)
Fair Value (Estimated)	256,044	224,412
Corporate securities
Securities to be held to maturity, cost and FMV [Abstract]
Amortized Cost	22,250	14,750
Unrealized Gains	433	157
Unrealized Losses	(2)	0
Fair Value (Estimated)	$ 22,681	$ 14,907

Investment Securities - Summa_3

Investment Securities - Summary of Contractual Maturities (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Available-for-sale Securities, Debt Maturities [Abstract]
Amortized Cost, Due in 1 year or less	$ 117	$ 127
Fair Value (Estimated), Due in 1 year or less	120	127
Amortized Cost, Due in 1 to 5 years	17,718	36,534
Fair Value (Estimated), Due in 1 to 5 years	17,915	36,778
Amortized Cost, Due in 5 to 10 years	49,697	93,134
Fair Value (Estimated), Due in 1 to 5 years	51,001	95,014
Amortized Cost, Due after 10 years	239,504	226,095
Fair Value (Estimated), Due after 10 years	244,340	228,601
Securities available-for-sale, Amortized Cost	307,036	355,890
Fair Value (Estimated)	313,376	360,520
Debt Securities, Held-to-maturity, Maturity [Abstract]
Amortized Cost, Due in 1 year or less	3,607	1,334
Fair Value (Estimated), Due in 1 year or less	3,641	1,338
Amortized Cost, Due in 1 to 5 years	30,867	25,860
Fair Value (Estimated), Due in 1 to 5 years	31,792	26,323
Amortized Cost, Due in 5 to 10 years	183,679	179,133
Fair Value (Estimated), Due in 1 to 5 years	190,153	182,834
Amortized Cost, Due after 10 years	147,460	75,279
Fair Value (Estimated), Due after 10 years	151,548	76,550
Amortized Cost	365,613	281,606
Fair Value (Estimated)	$ 377,134	$ 287,045

Investment Securities - Narrati

Investment Securities - Narrative (Details)	1 Months Ended	12 Months Ended
	Dec. 31, 2019USD ($)security	Dec. 31, 2020USD ($)loanstatesecurity	Dec. 31, 2019USD ($)security	Dec. 31, 2018USD ($)	Sep. 30, 2014USD ($)
Debt Securities, Available-for-sale [Line Items]
Number of securities temporarily impaired (security) | security	86	50	86
Number of securities temporarily impaired for 12 months or more (security) | security	28	10	28
Period of temporary impairment		12 months	12 months
Amortized cost of securities transferred		$ 24,900,000			$ 89,780,000
Net unrealized gains (losses) on securities transferred		1,600,000			(15,000)
Proceeds from sales of securities available for sale	$ 4,300,000	103,579,000	$ 8,339,000	$ 459,000
Gain on sale of securities	209,000	1,155,000	224,000
Fair value of securities transferred					$ 89,757,000
Net unrealized loss on securities transferred from available for sale to held to maturity	(182,000)	$ (133,000)	(182,000)
Number of states | state		6
Federal Home Loan Bank Stock	7,945,000	$ 9,508,000	7,945,000
Impairment losses		$ 0
State and political subdivisions
Debt Securities, Available-for-sale [Line Items]
Number of securities temporarily impaired (security) | loan		28
Proceeds from sale of held-to-maturity securities		$ 8,600,000
Cumulative book value		8,313,000
Net realized gain from sale of municipal securities		268,000
Other equity securities
Debt Securities, Available-for-sale [Line Items]
Securities pledged as collateral	$ 214,173,000	$ 297,326,000	$ 214,173,000

Investment Securities - Securit

Investment Securities - Securities Gains and Losses (Details) - USD ($) $ in Thousands	1 Months Ended	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Investments, Debt and Equity Securities [Abstract]
Proceeds from sales of securities		$ 112,179	$ 9,229
Proceeds from sales of securities available for sale	$ 4,300	103,579	8,339	$ 459
Gross realized gains		1,689	224
Gross realized gains				137
Gross realized losses		(534)	0
Gross realized losses				0
Net gain	$ 209	1,155	224
Net gain		1,155	224	137
Related income taxes		$ 243	$ 47	$ 29

Investment Securities - Secur_2

Investment Securities - Securities Temporarily Impaired (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, Fair Value	$ 99,070	$ 77,148
Less than 12 months, Unrealized Losses	(1,062)	(588)
12 months or more, Fair Value	3,878	19,000
12 months or more, Unrealized Losses	(88)	(498)
Fair Value	102,948	96,148
Unrealized Losses	(1,150)	(1,086)
U.S. government-sponsored agencies
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, Fair Value	30,212	12,372
Less than 12 months, Unrealized Losses	(333)	(128)
12 months or more, Fair Value	0	0
12 months or more, Unrealized Losses	0	0
Fair Value	30,212	12,372
Unrealized Losses	(333)	(128)
Mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, Fair Value	65,505	54,244
Less than 12 months, Unrealized Losses	(724)	(359)
12 months or more, Fair Value	3,878	18,696
12 months or more, Unrealized Losses	(88)	(490)
Fair Value	69,383	72,940
Unrealized Losses	(812)	(849)
State and political subdivisions
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, Fair Value	855	10,532
Less than 12 months, Unrealized Losses	(3)	(101)
12 months or more, Fair Value	0	304
12 months or more, Unrealized Losses	0	(8)
Fair Value	855	10,836
Unrealized Losses	(3)	$ (109)
Corporate securities
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, Fair Value	2,498
Less than 12 months, Unrealized Losses	(2)
12 months or more, Fair Value	0
12 months or more, Unrealized Losses	0
Fair Value	2,498
Unrealized Losses	$ (2)

Mortgage Servicing Rights (Deta

Mortgage Servicing Rights (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Transfers and Servicing [Abstract]
Outstanding principal balance of loans serviced for others	$ 318,459	$ 266,173
Net gain from sale of loans	3,308	651	$ 490
Mortgage servicing rights capitalized	1,160	422
Amortization of mortgage servicing rights	352	231
Fair value of mortgage servicing rights	$ 1,985	2,089
Moving average of weekly prepayment data (in months)	3 months
Anticipated loan prepayment rate of servicing assets (in hundredths)	20.76%
Servicing assets and servicing liabilities at fair value, assumptions used to estimate fair value, discount rate adjustment factor (in hundredths)	9.00%
Summary of mortgage servicing rights [Abstract]
Mortgage servicing rights	$ 7,299	6,140
Accumulated amortization	(4,985)	(4,594)
Amortized cost	2,314	1,546
Impairment reserve	(358)	0
Mortgage servicing rights, net	$ 1,956	$ 1,546

Loans - Portfolio (Details)

Loans - Portfolio (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 1,476,761	$ 1,297,075	$ 1,238,283
Percentage of loans receivable	100.00%	100.00%
Commercial | Real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 442,121	$ 372,810	353,243
Percentage of loans receivable	29.90%	28.70%
Commercial | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 56,565	$ 38,084	27,304
Percentage of loans receivable	3.80%	3.00%
Commercial | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 285,015	$ 218,773	196,391
Percentage of loans receivable	19.30%	16.90%
Municipal
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 43,783	$ 41,288	51,128
Percentage of loans receivable	3.00%	3.20%
Residential | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 21,600	$ 14,813	17,743
Percentage of loans receivable	1.50%	1.20%
Residential | Term
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 522,070	$ 492,455	469,145
Percentage of loans receivable	35.30%	37.90%
Home equity line of credit
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 79,750	$ 92,349	98,469
Percentage of loans receivable	5.40%	7.10%
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 25,857	$ 26,503	$ 24,860
Percentage of loans receivable	1.80%	2.00%

Loans - Narrative (Details)

Loans - Narrative (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2020USD ($)loan	Dec. 31, 2019USD ($)loan	Dec. 31, 2018USD ($)
Schedule of Financing Receivables [Line Items]
Net deferred loan costs included in loan balances	$ 6,931	$ 7,419
Loans used to collateralize borrowings from the Federal Home Loan Bank of Boston	378,183	296,871
Commercial, construction and home equity loans used to collateralize unused line of credit at the Federal Reserve Bank of Boston	$ 259,599	$ 240,133
Number of loans | loan	74	81
Loans	$ 1,476,761	$ 1,297,075	$ 1,238,283
Forgiveness payments received	1,661	1,120	$ 1,273
Nonaccrual loans	6,721	16,649
Interest income which would have been recognized on these loans, if interest had been accrued	558	906
Loans more than 90 days past due accruing interest	1,505	1,560
Loans to directors, officers and employees	36,880	35,071
Amounts past due	9,722	15,017
TDR recorded investment	$ 11,534	$ 21,424
Number of loans | loan	14	13
TDR recorded investment more than 30 days past due	$ 1,577	$ 1,510
Number of loans placed on TDR status in previous 12 months | loan	1	2
Number of loans | loan	3	11
Loans classified as TDRs that are involved in bankruptcy	$ 810
Number of loans classified as TDRs that were on non-accrual status | loan	22
Loans classified as TDRs that were on non-accrual status	$ 2,216
Number of loans classified as TDRs that are involved in foreclosure | loan	2
Loans classified as TDRs that are involved in foreclosure	$ 254
Number of mortgage loans in the process of foreclosure | loan	11	14
Mortgage loans in the process of foreclosure	$ 1,109	$ 1,502
Original or Subsequent Modification | Exemption from Troubled Debt Restructure Designation, CARES Act
Schedule of Financing Receivables [Line Items]
Loans	$ 62,208
Percentage of loans receivable, by type	0.042
Out of Modification | Exemption from Troubled Debt Restructure Designation, CARES Act
Schedule of Financing Receivables [Line Items]
Loans	$ 213,819
Amounts past due	$ 972
Past due rate	0.45%
Small Business Administration (SBA), CARES Act, Paycheck Protection Program
Schedule of Financing Receivables [Line Items]
Number of loans | loan	1,718
Loans	$ 97,566
Forgiveness payments received	$ 37,000
Small Business Administration (SBA), CARES Act, Excluding Paycheck Protection Program
Schedule of Financing Receivables [Line Items]
Number of loans | loan	1,031
Loans	$ 291,100
Percentage of loans receivable, by type	0.196
Loans Receivable in Bankruptcy
Schedule of Financing Receivables [Line Items]
Number of loans | loan	7

Loans - Summary of Loans to Dir

Loans - Summary of Loans to Directors and Executive Officers (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Loans and Leases Receivable, Related Parties [Roll Forward]
Beginning balance	$ 21,134	$ 22,149
New loans	3,544	521
Repayments	(3,138)	(1,536)
Retired director	(326)	0
Ending balance	$ 21,214	$ 21,134

Loans - Modification Statuses b

Loans - Modification Statuses by Portfolio Segment (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2020USD ($)loan	Dec. 31, 2019USD ($)loan	Dec. 31, 2018USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Units | loan	74	81
Balance	$ 1,476,761	$ 1,297,075	$ 1,238,283
Out of Modification | Exemption from Troubled Debt Restructure Designation, CARES Act
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance	$ 213,819
Commercial/Municipal Portfolio Segment | Exemption from Troubled Debt Restructure Designation, CARES Act
Accounts, Notes, Loans and Financing Receivable [Line Items]
Units | loan	601
Percentage of loans receivable, by type	1
Balance	$ 238,408
Percentage of balance	100.00%
Commercial/Municipal Portfolio Segment | Paid Off | Exemption from Troubled Debt Restructure Designation, CARES Act
Accounts, Notes, Loans and Financing Receivable [Line Items]
Units | loan	61
Percentage of loans receivable, by type	0.100
Balance	$ 9,027
Percentage of balance	4.00%
Commercial/Municipal Portfolio Segment | Subsequent Modification | Exemption from Troubled Debt Restructure Designation, CARES Act
Accounts, Notes, Loans and Financing Receivable [Line Items]
Units | loan	54
Percentage of loans receivable, by type	0.090
Balance	$ 32,724
Percentage of balance	14.00%
Commercial/Municipal Portfolio Segment | Still in Original Modification | Exemption from Troubled Debt Restructure Designation, CARES Act
Accounts, Notes, Loans and Financing Receivable [Line Items]
Units | loan	16
Percentage of loans receivable, by type	0.030
Balance	$ 7,244
Percentage of balance	3.00%
Commercial/Municipal Portfolio Segment | Out of Modification | Exemption from Troubled Debt Restructure Designation, CARES Act
Accounts, Notes, Loans and Financing Receivable [Line Items]
Units | loan	470
Percentage of loans receivable, by type	0.780
Balance	$ 189,413
Percentage of balance	79.00%
Residential | Exemption from Troubled Debt Restructure Designation, CARES Act
Accounts, Notes, Loans and Financing Receivable [Line Items]
Units | loan	362
Percentage of loans receivable, by type	1
Balance	$ 51,566
Percentage of balance	100.00%
Residential | Paid Off | Exemption from Troubled Debt Restructure Designation, CARES Act
Accounts, Notes, Loans and Financing Receivable [Line Items]
Units | loan	27
Percentage of loans receivable, by type	0.070
Balance	$ 5,930
Percentage of balance	12.00%
Residential | Subsequent Modification | Exemption from Troubled Debt Restructure Designation, CARES Act
Accounts, Notes, Loans and Financing Receivable [Line Items]
Units | loan	154
Percentage of loans receivable, by type	0.430
Balance	$ 19,468
Percentage of balance	38.00%
Residential | Still in Original Modification | Exemption from Troubled Debt Restructure Designation, CARES Act
Accounts, Notes, Loans and Financing Receivable [Line Items]
Units | loan	27
Percentage of loans receivable, by type	0.070
Balance	$ 2,615
Percentage of balance	5.00%
Residential | Out of Modification | Exemption from Troubled Debt Restructure Designation, CARES Act
Accounts, Notes, Loans and Financing Receivable [Line Items]
Units | loan	154
Percentage of loans receivable, by type	0.430
Balance	$ 23,553
Percentage of balance	45.00%
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Units | loan	1	0
Balance	$ 25,857	$ 26,503	$ 24,860
Consumer | Exemption from Troubled Debt Restructure Designation, CARES Act
Accounts, Notes, Loans and Financing Receivable [Line Items]
Units | loan	68
Percentage of loans receivable, by type	1
Balance	$ 1,129
Percentage of balance	100.00%
Consumer | Paid Off | Exemption from Troubled Debt Restructure Designation, CARES Act
Accounts, Notes, Loans and Financing Receivable [Line Items]
Units | loan	11
Percentage of loans receivable, by type	0.160
Balance	$ 118
Percentage of balance	10.00%
Consumer | Subsequent Modification | Exemption from Troubled Debt Restructure Designation, CARES Act
Accounts, Notes, Loans and Financing Receivable [Line Items]
Units | loan	3
Percentage of loans receivable, by type	0.040
Balance	$ 104
Percentage of balance	9.00%
Consumer | Still in Original Modification | Exemption from Troubled Debt Restructure Designation, CARES Act
Accounts, Notes, Loans and Financing Receivable [Line Items]
Units | loan	4
Percentage of loans receivable, by type	0.060
Balance	$ 53
Percentage of balance	5.00%
Consumer | Out of Modification | Exemption from Troubled Debt Restructure Designation, CARES Act
Accounts, Notes, Loans and Financing Receivable [Line Items]
Units | loan	50
Percentage of loans receivable, by type	0.740
Balance	$ 854
Percentage of balance	76.00%

Loans - Past-due Status of Loan

Loans - Past-due Status of Loans by Class (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	$ 9,722	$ 15,017
Current	1,467,039	1,282,058
Ending balance	1,476,761	1,297,075	$ 1,238,283
90 Plus Days And Accruing	1,505	1,560
Commercial | Real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	555	1,774
Current	441,566	371,036
Ending balance	442,121	372,810	353,243
90 Plus Days And Accruing	0	0
Commercial | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	93	271
Current	56,472	37,813
Ending balance	56,565	38,084	27,304
90 Plus Days And Accruing	0	0
Commercial | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	2,634	5,028
Current	282,381	213,745
Ending balance	285,015	218,773	196,391
90 Plus Days And Accruing	1,464	1,464
Municipal
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	0	0
Current	43,783	41,288
Ending balance	43,783	41,288	51,128
90 Plus Days And Accruing	0	0
Residential | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	0	0
Current	21,600	14,813
Ending balance	21,600	14,813	17,743
90 Plus Days And Accruing	0	0
Residential | Term
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	3,955	4,640
Current	518,115	487,815
Ending balance	522,070	492,455	469,145
90 Plus Days And Accruing	23	86
Home equity line of credit
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	2,336	2,957
Current	77,414	89,392
Ending balance	79,750	92,349	98,469
90 Plus Days And Accruing	0	0
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	149	347
Current	25,708	26,156
Ending balance	25,857	26,503	$ 24,860
90 Plus Days And Accruing	18	10
30-59 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	2,916	6,139
30-59 Days Past Due | Commercial | Real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	139	786
30-59 Days Past Due | Commercial | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	13	0
30-59 Days Past Due | Commercial | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	490	2,764
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	0
30-59 Days Past Due | Residential | Term
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	540	1,129
30-59 Days Past Due | Home equity line of credit
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	1,645	1,169
30-59 Days Past Due | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	89	291
60-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	2,417	2,092
60-89 Days Past Due | Commercial | Real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	190	377
60-89 Days Past Due | Commercial | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	0	14
60-89 Days Past Due | Commercial | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	62	465
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	1,799	1,132
60-89 Days Past Due | Home equity line of credit
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	324	58
60-89 Days Past Due | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	42	46
90+ Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	4,389	6,786
90+ Days Past Due | Commercial | Real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	226	611
90+ Days Past Due | Commercial | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	80	257
90+ Days Past Due | Commercial | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	2,082	1,799
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	1,616	2,379
90+ Days Past Due | Home equity line of credit
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	367	1,730
90+ Days Past Due | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	$ 18	$ 10

Loans - Nonaccrual Loans (Detai

Loans - Nonaccrual Loans (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans	$ 6,721	$ 16,649
Commercial | Real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans	543	1,784
Commercial | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans	89	256
Commercial | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans	1,481	6,534
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	3,593	5,899
Home equity line of credit
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans	1,015	2,171
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans	$ 0	$ 5

Loans - Information Regarding I

Loans - Information Regarding Impaired Loans (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Receivables [Abstract]
Average investment in impaired loans	$ 21,088	$ 31,557	$ 31,805
Interest income recognized on impaired loans, all on cash basis	478	735	864
Balance of impaired loans	16,039	29,274	31,751
Less portion for which no allowance for loan losses is allocated	(12,098)	(18,212)
Portion of impaired loan balance for which an allowance for loan losses is allocated	3,941	11,062
Portion of allowance for loan losses allocated to the impaired loan balance	$ 462	$ 2,213	$ 2,308

Loans - Impaired Loans by Class

Loans - Impaired Loans by Class (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Impaired Financing Receivable, Recorded Investment [Abstract]
Recorded Investment, No Related Allowance	$ 12,098	$ 18,212	$ 21,030
Recorded Investment, With Related Allowance	3,941	11,062	10,721
Balance of impaired loans	16,039	29,274	31,751
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]
Unpaid Principal Balance, No Related Allowance	13,806	20,330	22,831
Unpaid Principal Balance, With Related Allowance	4,036	11,848	11,397
Unpaid Principal Balance	17,842	32,178	34,228
Related Allowance	462	2,213	2,308
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Average Recorded Investment, No Related Allowance	15,473	20,542	18,776
Average Recorded Investment, With Related Allowance	5,615	11,015	13,029
Average Recorded Investment	21,088	31,557	31,805
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract]
Recognized Interest Income, No Related Allowance	336	593	764
Recognized Interest Income, With Related Allowance	142	142	100
Recognized Interest Income	478	735	864
Commercial | Real estate
Impaired Financing Receivable, Recorded Investment [Abstract]
Recorded Investment, No Related Allowance	2,060	5,235	8,718
Recorded Investment, With Related Allowance	969	1,074	1,042
Balance of impaired loans	3,029	6,309	9,760
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]
Unpaid Principal Balance, No Related Allowance	2,368	5,492	9,161
Unpaid Principal Balance, With Related Allowance	995	1,093	1,059
Unpaid Principal Balance	3,363	6,585	10,220
Related Allowance	112	251	260
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Average Recorded Investment, No Related Allowance	4,123	7,611	5,536
Average Recorded Investment, With Related Allowance	1,018	1,528	3,477
Average Recorded Investment	5,141	9,139	9,013
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract]
Recognized Interest Income, No Related Allowance	127	228	380
Recognized Interest Income, With Related Allowance	43	60	42
Recognized Interest Income	170	288	422
Commercial | Construction
Impaired Financing Receivable, Recorded Investment [Abstract]
Recorded Investment, No Related Allowance	89	958	721
Recorded Investment, With Related Allowance	681	0	0
Balance of impaired loans	770	958	721
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]
Unpaid Principal Balance, No Related Allowance	89	970	721
Unpaid Principal Balance, With Related Allowance	681	0	0
Unpaid Principal Balance	770	970	721
Related Allowance	18	0	0
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Average Recorded Investment, No Related Allowance	358	936	762
Average Recorded Investment, With Related Allowance	579	0	0
Average Recorded Investment	937	936	762
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract]
Recognized Interest Income, No Related Allowance	0	47	43
Recognized Interest Income, With Related Allowance	30	0	0
Recognized Interest Income	30	47	43
Commercial | Other
Impaired Financing Receivable, Recorded Investment [Abstract]
Recorded Investment, No Related Allowance	1,591	756	1,468
Recorded Investment, With Related Allowance	188	6,319	7,791
Balance of impaired loans	1,779	7,075	9,259
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]
Unpaid Principal Balance, No Related Allowance	1,623	786	1,555
Unpaid Principal Balance, With Related Allowance	202	6,925	8,216
Unpaid Principal Balance	1,825	7,711	9,771
Related Allowance	169	1,273	1,696
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Average Recorded Investment, No Related Allowance	999	965	2,037
Average Recorded Investment, With Related Allowance	1,193	6,778	7,471
Average Recorded Investment	2,192	7,743	9,508
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract]
Recognized Interest Income, No Related Allowance	15	29	32
Recognized Interest Income, With Related Allowance	3	0	5
Recognized Interest Income	18	29	37
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	7,335	10,176	9,136
Recorded Investment, With Related Allowance	2,079	2,263	1,768
Balance of impaired loans	9,414	12,439	10,904
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]
Unpaid Principal Balance, No Related Allowance	8,629	11,931	10,317
Unpaid Principal Balance, With Related Allowance	2,134	2,412	1,998
Unpaid Principal Balance	10,763	14,343	12,315
Related Allowance	163	237	335
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Average Recorded Investment, No Related Allowance	8,773	10,033	9,427
Average Recorded Investment, With Related Allowance	2,073	2,424	1,982
Average Recorded Investment	10,846	12,457	11,409
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract]
Recognized Interest Income, No Related Allowance	193	269	289
Recognized Interest Income, With Related Allowance	65	82	53
Recognized Interest Income	258	351	342
Home equity line of credit
Impaired Financing Receivable, Recorded Investment [Abstract]
Recorded Investment, No Related Allowance	1,015	1,087	972
Recorded Investment, With Related Allowance	24	1,401	120
Balance of impaired loans	1,039	2,488	1,092
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]
Unpaid Principal Balance, No Related Allowance	1,089	1,151	1,035
Unpaid Principal Balance, With Related Allowance	24	1,412	124
Unpaid Principal Balance	1,113	2,563	1,159
Related Allowance	0	447	17
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Average Recorded Investment, No Related Allowance	1,219	997	1,001
Average Recorded Investment, With Related Allowance	744	283	99
Average Recorded Investment	1,963	1,280	1,100
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract]
Recognized Interest Income, No Related Allowance	0	20	20
Recognized Interest Income, With Related Allowance	1	0	0
Recognized Interest Income	1	20	20
Consumer
Impaired Financing Receivable, Recorded Investment [Abstract]
Recorded Investment, No Related Allowance	8	0	15
Recorded Investment, With Related Allowance	0	5	0
Balance of impaired loans	8	5	15
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]
Unpaid Principal Balance, No Related Allowance	8	0	42
Unpaid Principal Balance, With Related Allowance	0	6	0
Unpaid Principal Balance	8	6	42
Related Allowance	0	5	0
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Average Recorded Investment, No Related Allowance	1	0	13
Average Recorded Investment, With Related Allowance	8	2	0
Average Recorded Investment	9	2	13
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract]
Recognized Interest Income, No Related Allowance	1	0	0
Recognized Interest Income, With Related Allowance	0	0	0
Recognized Interest Income	$ 1	$ 0	$ 0

Loans - TDRs by Class and Speci

Loans - TDRs by Class and Specific Reserve (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2020USD ($)loan	Dec. 31, 2019USD ($)loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | loan	74	81
Balance	$ 11,534	$ 21,424
Specific Reserves	$ 369	$ 1,677
Commercial | Real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | loan	13	17
Balance	$ 2,558	$ 4,836
Specific Reserves	$ 106	$ 246
Commercial | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | loan	1	1
Balance	$ 681	$ 701
Specific Reserves	$ 18	$ 0
Commercial | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | loan	6	8
Balance	$ 717	$ 6,932
Specific Reserves	$ 96	$ 1,231
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	51	52
Balance	$ 7,384	$ 8,472
Specific Reserves	$ 149	$ 200
Home equity line of credit
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | loan	2	3
Balance	$ 186	$ 483
Specific Reserves	$ 0	$ 0
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | loan	1	0
Balance	$ 8	$ 0
Specific Reserves	$ 0	$ 0

Loans - TDRs by Class and Assoc

Loans - TDRs by Class and Associated Specific Reserves (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2020USD ($)loan	Dec. 31, 2019USD ($)loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | loan	14	13
TDR recorded investment more than 30 days past due	$ 1,577	$ 1,510
Number of loans placed on TDR status in previous 12 months | loan	1	2
Balance	$ 1,577	$ 1,510
Specific Reserves	$ 97	$ 217
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	4
Balance	$ 419	$ 371
Specific Reserves	$ 92	$ 131
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	$ 988	$ 972
Specific Reserves	$ 5	$ 86
Home equity line of credit
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | loan	1	1
Balance	$ 162	$ 167
Specific Reserves	$ 0	$ 0
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | loan	1	0
Balance	$ 8	$ 0
Specific Reserves	$ 0	$ 0

Loans - Pre-Modification and Po

Loans - Pre-Modification and Post-Modification Outstanding Recorded Investment (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2020USD ($)loan	Dec. 31, 2019USD ($)loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | loan	3	11
Pre-Modification Outstanding Recorded Investment	$ 242	$ 1,203
Post-Modification Outstanding Recorded Investment	193	1,060
Specific Reserves	$ 21	$ 162
Commercial | Real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | loan	0	2
Pre-Modification Outstanding Recorded Investment	$ 0	$ 109
Post-Modification Outstanding Recorded Investment	0	90
Specific Reserves	$ 0	$ 90
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	0	1
Pre-Modification Outstanding Recorded Investment	$ 0	$ 98
Post-Modification Outstanding Recorded Investment	0	98
Specific Reserves	$ 0	$ 0
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	2	8
Pre-Modification Outstanding Recorded Investment	$ 234	$ 996
Post-Modification Outstanding Recorded Investment	185	872
Specific Reserves	$ 21	$ 72
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	1	0
Pre-Modification Outstanding Recorded Investment	$ 8	$ 0
Post-Modification Outstanding Recorded Investment	8	0
Specific Reserves	$ 0	$ 0

Allowance for Loan Losses - Com

Allowance for Loan Losses - Composition of Allowance for Loans Losses, by Class (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for Loans Evaluated Individually for Impairment	$ 462	$ 2,213	$ 2,308
Allowance for Loans Evaluated Collectively for Impairment	15,791	9,426	8,924
Total Allowance for Loan Losses	16,253	11,639	11,232	$ 10,729
Commercial | Real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for Loans Evaluated Individually for Impairment	112	251	260
Allowance for Loans Evaluated Collectively for Impairment	5,066	3,491	3,307
Total Allowance for Loan Losses	5,178	3,742	3,567	3,872
Commercial | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for Loans Evaluated Individually for Impairment	18	0	0
Allowance for Loans Evaluated Collectively for Impairment	644	365	255
Total Allowance for Loan Losses	662	365	255	434
Commercial | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for Loans Evaluated Individually for Impairment	169	1,273	1,696
Allowance for Loans Evaluated Collectively for Impairment	3,269	2,056	1,845
Total Allowance for Loan Losses	3,438	3,329	3,541	3,358
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	171	27	24
Total Allowance for Loan Losses	171	27	24	20
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	102	25	34
Total Allowance for Loan Losses	102	25	34	36
Residential | Term
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for Loans Evaluated Individually for Impairment	163	237	335
Allowance for Loans Evaluated Collectively for Impairment	2,416	787	900
Total Allowance for Loan Losses	2,579	1,024	1,235	1,130
Home equity line of credit
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for Loans Evaluated Individually for Impairment	0	447	17
Allowance for Loans Evaluated Collectively for Impairment	1,211	631	713
Total Allowance for Loan Losses	1,211	1,078	730	692
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for Loans Evaluated Individually for Impairment	0	5	0
Allowance for Loans Evaluated Collectively for Impairment	778	862	630
Total Allowance for Loan Losses	778	867	630	545
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	2,134	1,182	1,216
Total Allowance for Loan Losses	$ 2,134	$ 1,182	$ 1,216	$ 642

Allowance for Loan Losses - Fin

Allowance for Loan Losses - Financing Receivable and Allowance Element by Class (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less allowance for loan losses	$ 16,253	$ 11,639	$ 11,232	$ 10,729
Commercial | Real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less allowance for loan losses	5,178	3,742	3,567	3,872
Commercial | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less allowance for loan losses	662	365	255	434
Commercial | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less allowance for loan losses	3,438	3,329	3,541	3,358
Municipal
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less allowance for loan losses	171	27	24	20
Residential | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less allowance for loan losses	102	25	34	36
Residential | Term
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less allowance for loan losses	2,579	1,024	1,235	1,130
Home equity line of credit
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less allowance for loan losses	1,211	1,078	730	692
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less allowance for loan losses	778	867	630	545
Unallocated
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less allowance for loan losses	2,134	1,182	$ 1,216	$ 642
Specific Reserves on Loans Evaluated Individually for Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less allowance for loan losses	462	2,213
Specific Reserves on Loans Evaluated Individually for Impairment | Commercial | Real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less allowance for loan losses	112	251
Specific Reserves on Loans Evaluated Individually for Impairment | Commercial | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less allowance for loan losses	18	0
Specific Reserves on Loans Evaluated Individually for Impairment | Commercial | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less allowance for loan losses	169	1,273
Specific Reserves on Loans Evaluated Individually for Impairment | Municipal
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less allowance for loan losses	0	0
Specific Reserves on Loans Evaluated Individually for Impairment | Residential | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less allowance for loan losses	0	0
Specific Reserves on Loans Evaluated Individually for Impairment | Residential | Term
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less allowance for loan losses	163	237
Specific Reserves on Loans Evaluated Individually for Impairment | Home equity line of credit
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less allowance for loan losses	0	447
Specific Reserves on Loans Evaluated Individually for Impairment | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less allowance for loan losses	0	5
Specific Reserves on Loans Evaluated Individually for Impairment | Unallocated
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less allowance for loan losses	0	0
General Reserves on Loans Based on Historical Loss Experience
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less allowance for loan losses	1,862	1,983
General Reserves on Loans Based on Historical Loss Experience | Commercial | Real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less allowance for loan losses	721	729
General Reserves on Loans Based on Historical Loss Experience | Commercial | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less allowance for loan losses	92	76
General Reserves on Loans Based on Historical Loss Experience | Commercial | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less allowance for loan losses	465	430
General Reserves on Loans Based on Historical Loss Experience | Municipal
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less 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]
Less allowance for loan losses	6	5
General Reserves on Loans Based on Historical Loss Experience | Residential | Term
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less allowance for loan losses	145	153
General Reserves on Loans Based on Historical Loss Experience | Home equity line of credit
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less allowance for loan losses	151	130
General Reserves on Loans Based on Historical Loss Experience | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less allowance for loan losses	282	460
General Reserves on Loans Based on Historical Loss Experience | Unallocated
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less allowance for loan losses	0	0
Reserves for Qualitative Factors
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less allowance for loan losses	11,795	6,261
Reserves for Qualitative Factors | Commercial | Real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less allowance for loan losses	4,345	2,762
Reserves for Qualitative Factors | Commercial | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less allowance for loan losses	552	289
Reserves for Qualitative Factors | Commercial | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less allowance for loan losses	2,804	1,626
Reserves for Qualitative Factors | Municipal
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less allowance for loan losses	171	27
Reserves for Qualitative Factors | Residential | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less allowance for loan losses	96	20
Reserves for Qualitative Factors | Residential | Term
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less allowance for loan losses	2,271	634
Reserves for Qualitative Factors | Home equity line of credit
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less allowance for loan losses	1,060	501
Reserves for Qualitative Factors | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less allowance for loan losses	496	402
Reserves for Qualitative Factors | Unallocated
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less allowance for loan losses	0	0
Unallocated Reserves
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less allowance for loan losses	2,134	1,182
Unallocated Reserves | Commercial | Real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less allowance for loan losses	0	0
Unallocated Reserves | Commercial | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less allowance for loan losses	0	0
Unallocated Reserves | Commercial | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less allowance for loan losses	0	0
Unallocated Reserves | Municipal
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less allowance for loan losses	0	0
Unallocated Reserves | Residential | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less allowance for loan losses	0	0
Unallocated Reserves | Residential | Term
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less allowance for loan losses	0	0
Unallocated Reserves | Home equity line of credit
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less allowance for loan losses	0	0
Unallocated Reserves | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less allowance for loan losses	0	0
Unallocated Reserves | Unallocated
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less allowance for loan losses	$ 2,134	$ 1,182

Allowance for Loan Losses - Nar

Allowance for Loan Losses - Narrative (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2020USD ($)loan_class	Dec. 31, 2019USD ($)	Dec. 31, 2018USD ($)	Dec. 31, 2017USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percent of related loans	0.80%	0.48%
Increase (decrease) in qualitative portion	$ 5,534
Allowance for loan losses	$ 16,253	$ 11,639	$ 11,232	$ 10,729
Allowance for loan losses as a percent of total loans	1.10%	0.90%
Allowance for loan losses as a percent of total loans, excluding PPP loan balances	1.15%
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	37.70%
Construction loans, maximum percent of capital	100.00%
Construction loans and non-owner-occupied commercial real estate loans, percent of capital	147.10%
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	$ 662	$ 365	255	434
Loan maturities	2 years
Home equity line of credit
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	$ 1,211	1,078	730	692
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	$ 102	25	34	36
Loan maturities	1 year
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	$ 778	867	$ 630	$ 545
Delinquent period before consumer loans are charged off	120 days
Unallocated Reserves
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	$ 2,134	$ 1,182
Percent of total allowance reserve	13.10%	10.20%
Unallocated Reserves | Commercial | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	$ 0	$ 0
Unallocated Reserves | Home equity line of credit
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	0	0
Unallocated Reserves | Residential | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	0	0
Unallocated Reserves | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	$ 0	$ 0

Allowance for Loan Losses - Ris

Allowance for Loan Losses - Risk Ratings by Segment (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	$ 827,484	$ 670,955
Commercial | Real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	442,121	372,810
Commercial | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	56,565	38,084
Commercial | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	285,015	218,773
Municipal
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	43,783	41,288
1 Strong
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	2,421	4,290
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	2,402	4,258
1 Strong | Municipal
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	19	32
2 Above average
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	56,546	57,664
2 Above average | Commercial | Real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	5,938	12,393
2 Above average | Commercial | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	2,343	794
2 Above average | Commercial | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	6,326	6,187
2 Above average | Municipal
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	41,939	38,290
3 Satisfactory
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	199,165	118,920
3 Satisfactory | Commercial | Real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	91,475	74,709
3 Satisfactory | Commercial | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	2,889	2,305
3 Satisfactory | Commercial | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	104,432	41,527
3 Satisfactory | Municipal
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	369	379
4 Average
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	414,786	334,503
4 Average | Commercial | Real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	261,539	205,510
4 Average | Commercial | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	31,221	19,017
4 Average | Commercial | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	120,570	107,389
4 Average | Municipal
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	1,456	2,587
5 Watch
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	137,026	126,222
5 Watch | Commercial | Real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	72,840	63,582
5 Watch | Commercial | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	19,893	15,488
5 Watch | Commercial | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	44,293	47,152
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	2,988	3,148
6 OAEM | Commercial | Real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	2,754	1,160
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	234	1,988
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	14,552	26,208
8 Doubtful | Commercial | Real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	7,575	15,456
8 Doubtful | Commercial | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	219	480
8 Doubtful | Commercial | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	6,758	10,272
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	0
8 Doubtful | Commercial | Real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	0	0
8 Doubtful | Commercial | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	0	0
8 Doubtful | Commercial | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	0	0
8 Doubtful | Municipal
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	$ 0	$ 0

Allowance for Loan Losses - Act

Allowance for Loan Losses - Activity by Class (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance				$ 11,639				$ 11,232	$ 11,639	$ 11,232	$ 10,729
Chargeoffs									1,661	1,120	1,273
Recoveries									225	277	276
Provision for loan losses	$ 1,500	$ 1,800	$ 2,350	400	$ 375	$ 250	$ 250	375	6,050	1,250	1,500
Ending balance	16,253				11,639				16,253	11,639	11,232
Ending balance specifically evaluated for impairment	462				2,213				462	2,213	2,308
Ending balance collectively evaluated for impairment	15,791				9,426				15,791	9,426	8,924
Ending balance	1,476,761				1,297,075				1,476,761	1,297,075	1,238,283
Ending balance specifically evaluated for impairment	16,039				29,274				16,039	29,274	31,751
Ending balance collectively evaluated for impairment	1,460,722				1,267,801				1,460,722	1,267,801	1,206,532
Commercial | Real estate
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance				3,742				3,567	3,742	3,567	3,872
Chargeoffs									1,088	89	168
Recoveries									0	15	52
Provision for loan losses									2,524	249	(189)
Ending balance	5,178				3,742				5,178	3,742	3,567
Ending balance specifically evaluated for impairment	112				251				112	251	260
Ending balance collectively evaluated for impairment	5,066				3,491				5,066	3,491	3,307
Ending balance	442,121				372,810				442,121	372,810	353,243
Ending balance specifically evaluated for impairment	3,029				6,309				3,029	6,309	9,760
Ending balance collectively evaluated for impairment	439,092				366,501				439,092	366,501	343,483
Commercial | Construction
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance				365				255	365	255	434
Chargeoffs									0	0	0
Recoveries									0	0	0
Provision for loan losses									297	110	(179)
Ending balance	662				365				662	365	255
Ending balance specifically evaluated for impairment	18				0				18	0	0
Ending balance collectively evaluated for impairment	644				365				644	365	255
Ending balance	56,565				38,084				56,565	38,084	27,304
Ending balance specifically evaluated for impairment	770				958				770	958	721
Ending balance collectively evaluated for impairment	55,795				37,126				55,795	37,126	26,583
Commercial | Other
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance				3,329				3,541	3,329	3,541	3,358
Chargeoffs									27	179	423
Recoveries									37	73	40
Provision for loan losses									99	(106)	566
Ending balance	3,438				3,329				3,438	3,329	3,541
Ending balance specifically evaluated for impairment	169				1,273				169	1,273	1,696
Ending balance collectively evaluated for impairment	3,269				2,056				3,269	2,056	1,845
Ending balance	285,015				218,773				285,015	218,773	196,391
Ending balance specifically evaluated for impairment	1,779				7,075				1,779	7,075	9,259
Ending balance collectively evaluated for impairment	283,236				211,698				283,236	211,698	187,132
Municipal
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance				27				24	27	24	20
Chargeoffs									0	0	0
Recoveries									0	0	0
Provision for loan losses									144	3	4
Ending balance	171				27				171	27	24
Ending balance specifically evaluated for impairment	0				0				0	0	0
Ending balance collectively evaluated for impairment	171				27				171	27	24
Ending balance	43,783				41,288				43,783	41,288	51,128
Ending balance specifically evaluated for impairment	0				0				0	0	0
Ending balance collectively evaluated for impairment	43,783				41,288				43,783	41,288	51,128
Residential | Construction
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance				25				34	25	34	36
Chargeoffs									0	0	0
Recoveries									0	0	0
Provision for loan losses									77	(9)	(2)
Ending balance	102				25				102	25	34
Ending balance specifically evaluated for impairment	0				0				0	0	0
Ending balance collectively evaluated for impairment	102				25				102	25	34
Ending balance	21,600				14,813				21,600	14,813	17,743
Ending balance specifically evaluated for impairment	0				0				0	0	0
Ending balance collectively evaluated for impairment	21,600				14,813				21,600	14,813	17,743
Residential | Term
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance				1,024				1,235	1,024	1,235	1,130
Chargeoffs									66	445	213
Recoveries									34	57	64
Provision for loan losses									1,587	177	254
Ending balance	2,579				1,024				2,579	1,024	1,235
Ending balance specifically evaluated for impairment	163				237				163	237	335
Ending balance collectively evaluated for impairment	2,416				787				2,416	787	900
Ending balance	522,070				492,455				522,070	492,455	469,145
Ending balance specifically evaluated for impairment	9,414				12,439				9,414	12,439	10,904
Ending balance collectively evaluated for impairment	512,656				480,016				512,656	480,016	458,241
Home equity line of credit
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance				1,078				730	1,078	730	692
Chargeoffs									153	69	121
Recoveries									22	4	24
Provision for loan losses									264	413	135
Ending balance	1,211				1,078				1,211	1,078	730
Ending balance specifically evaluated for impairment	0				447				0	447	17
Ending balance collectively evaluated for impairment	1,211				631				1,211	631	713
Ending balance	79,750				92,349				79,750	92,349	98,469
Ending balance specifically evaluated for impairment	1,039				2,488				1,039	2,488	1,092
Ending balance collectively evaluated for impairment	78,711				89,861				78,711	89,861	97,377
Consumer
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance				867				630	867	630	545
Chargeoffs									327	338	348
Recoveries									132	128	96
Provision for loan losses									106	447	337
Ending balance	778				867				778	867	630
Ending balance specifically evaluated for impairment	0				5				0	5	0
Ending balance collectively evaluated for impairment	778				862				778	862	630
Ending balance	25,857				26,503				25,857	26,503	24,860
Ending balance specifically evaluated for impairment	8				5				8	5	15
Ending balance collectively evaluated for impairment	25,849				26,498				25,849	26,498	24,845
Unallocated
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance				$ 1,182				$ 1,216	1,182	1,216	642
Chargeoffs									0	0	0
Recoveries									0	0	0
Provision for loan losses									952	(34)	574
Ending balance	2,134				1,182				2,134	1,182	1,216
Ending balance specifically evaluated for impairment	0				0				0	0	0
Ending balance collectively evaluated for impairment	2,134				1,182				2,134	1,182	1,216
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 - Schedu

Premises and Equipment - Schedule of Premises and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	$ 47,833	$ 41,004
Less accumulated depreciation	20,582	19,699
Premises and equipment, net	27,251	21,305
Land
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	6,178	5,100
Land improvements
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	1,710	1,100
Buildings
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	28,067	21,946
Equipment
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	$ 11,878	$ 12,858

Premises and Equipment - Antici

Premises and Equipment - Anticipated Rental Revenue (Details) $ in Thousands	Dec. 31, 2020USD ($)
Property, Plant and Equipment [Abstract]
2021	$ 129
2022	125
2023	41
2024	16
Total	$ 311

Premises and Equipment - Leases

Premises and Equipment - Leases (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 11, 2020	Dec. 31, 2019
Property, Plant and Equipment [Line Items]
Remaining lease term	23 years
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	us-gaap:PropertyPlantAndEquipmentNet		us-gaap:PropertyPlantAndEquipmentNet
Operating lease asset	$ 511,000		$ 0
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	us-gaap:OtherLiabilitiesNoncurrent
Net lease liability	$ 511,000	$ 511,000	$ 0
Lease expense	0
2021	28,000
2022	28,000
2023	28,000
2024	28,000
2025	28,000
Thereafter	486,000
Total undiscounted lease payments	626,000
Less: imputed interest	$ 115,000

Other Real Estate Owned (Detail

Other Real Estate Owned (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Summary Other Real Estate Owned [Abstract]
Real estate acquired in settlement of loans	$ 908	$ 279
Real Estate Owned Valuation Allowance [Roll Forward]
Balance at beginning of year	0	0	$ 53
Losses charged to allowance	0	0	(53)
Provision charged to operating expenses	45	0	0
Balance at end of year	$ 45	$ 0	$ 0

Income Taxes (Details)

Income Taxes (Details) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020USD ($)limitedPartnership	Sep. 30, 2020USD ($)	Jun. 30, 2020USD ($)	Mar. 31, 2020USD ($)	Dec. 31, 2019USD ($)limitedPartnership	Sep. 30, 2019USD ($)	Jun. 30, 2019USD ($)	Mar. 31, 2019USD ($)	Dec. 31, 2020USD ($)limitedPartnership	Dec. 31, 2019USD ($)limitedPartnership	Dec. 31, 2018USD ($)
Federal income tax
Current									$ 4,923	$ 3,978	$ 4,407
Deferred									(262)	336	(492)
Federal income tax expense									4,661	4,314	3,915
State franchise tax									460	421	391
Income tax expense	$ 1,285	$ 1,379	$ 1,256	$ 1,201	$ 1,261	$ 1,180	$ 1,180	$ 1,114	5,121	4,735	4,306
Reconciliation between US expected tax rate and actual tax expense
Expected tax expense									6,773	6,355	5,847
Non-taxable income									(1,808)	(1,749)	(1,699)
State franchise tax, net of federal tax benefit									348	332	309
Equity compensation									(43)	(45)	(55)
Tax credits, net of amortization									(144)	(85)	(85)
Other									(5)	(73)	(11)
Income tax expense	1,285	$ 1,379	$ 1,256	$ 1,201	1,261	$ 1,180	$ 1,180	$ 1,114	5,121	4,735	$ 4,306
Components of deferred tax assets and liabilities
Allowance for loan losses	3,413				2,444				3,413	2,444
OREO	9				0				9	0
Accrued pension and post-retirement	948				926				948	926
Unrealized loss on derivative instruments	1,865				345				1,865	345
Unrealized loss on securities transferred from available for sale to held to maturity	35				48				35	48
Restricted stock grants	270				203				270	203
Core deposit intangible	24				21				24	21
Investment in flow through entities	82				55				82	55
Other assets	87				0				87	0
Total deferred tax asset	6,733				4,042				6,733	4,042
Net deferred loan costs	(1,894)				(1,669)				(1,894)	(1,669)
Depreciation	(2,013)				(1,434)				(2,013)	(1,434)
Unrealized gain on securities available for sale	(1,332)				(972)				(1,332)	(972)
Goodwill	(161)				(120)				(161)	(120)
Mortgage servicing rights	(411)				(325)				(411)	(325)
Unrealized gain on derivative instruments	(554)				(371)				(554)	(371)
Prepaid expense	(195)				(205)				(195)	(205)
Total deferred tax liability	(6,560)				(5,096)				(6,560)	(5,096)
Net deferred tax asset (liability)	$ 173								$ 173
Net deferred tax asset (liability)					$ (1,054)					$ (1,054)
Limited partnerships
Limited partnerships held as investments | limitedPartnership	4				4				4	4
Tax credits from investments in limited partnerships									$ 351	$ 330
Amortization of investments in limited partnerships									311	307
Carrying value of investments in limited partnerships	$ 1,734				$ 1,951				$ 1,734	$ 1,951

Certificates of Deposit (Detail

Certificates of Deposit (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Maturities Of Certificates Of Deposit [Line Items]
Certificates of deposit less than $100,000	$ 246,875	$ 277,225
Certificates $100,000 to $250,000	295,672	345,241
Certificates $250,000 and over	63,038	67,513
Total	605,585	689,979
Maturity of certificates of deposit [Abstract]
2021	500,339
2022	38,300
2023	47,183
2024	9,488
2025	10,131
2026 and thereafter	144
Total	605,585	689,979
Interest expense on certificates of deposit of $100,000 or greater	5,327	$ 6,060	$ 3,038
Less than $100,000
Maturities Of Certificates Of Deposit [Line Items]
Total	246,875
Maturity of certificates of deposit [Abstract]
2021	205,853
2022	16,889
2023	14,064
2024	4,562
2025	5,363
2026 and thereafter	144
Total	246,875
$100,000 and Greater
Maturities Of Certificates Of Deposit [Line Items]
Total	358,710
Maturity of certificates of deposit [Abstract]
2021	294,486
2022	21,411
2023	33,119
2024	4,926
2025	4,768
2026 and thereafter	0
Total	$ 358,710

Borrowed Funds (Details)

Borrowed Funds (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019
Disclosure of Repurchase Agreements [Abstract]
Amount of line of credit with correspondent banks	$ 51,000
Credit facility with Federal Reserve Bank	$ 95,000
Federal Home Loan Bank, Advances, Maturities Summary [Abstract]
Interest rate, due in year two	0.00%	155.00%
Interest rate, due in year three	0.00%	0.00%
Interest rate, due in year four	0.00%	0.00%
Interest rate, due in year five		0.00%
Interest rate, due in year six and thereafter	0.00%	0.00%
Due in twelve months maturity	$ 137,600	$ 137,400
Due in year two maturity	0	10,000
Due in year three maturity	0	0
Due in year four maturity	98	0
Due in year five maturity	55,000	105
Due thereafter	0	0
Total	192,698	147,505
Repurchase agreements for municipal and commercial customers	69,340	37,450
Total	$ 262,038	$ 184,955	$ 283,787	$ 278,805	$ 248,040	$ 181,417	$ 181,858	$ 170,419
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	0.00%	1.60%
Interest rate, due in year five	1.35%
Interest rate, Repurchase agreements for municipal and commercial customers	0.10%	0.10%
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	1.55%	1.97%
Interest rate, due in year five	1.40%
Interest rate, Repurchase agreements for municipal and commercial customers	2.00%	2.33%

Employee Benefit Plans (Details

Employee Benefit Plans (Details)	12 Months Ended
	Dec. 31, 2020USD ($)employeepostretirementBenefitPlan	Dec. 31, 2019USD ($)	Dec. 31, 2018USD ($)
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	3.00%
Defined contribution plan employer maximum percentage of annual profit-sharing contribution to plan for benefit of employee (in hundredths)	3.00%	2.00%	2.00%
Expense related to 401(k) plan	$ 981,000	$ 575,000	$ 578,000
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.
Unfunded, supplemental retirement benefits payable period	20 years
Pension expense	$ 450,000	165,000	$ 176,000
Accrued pension liability	$ 2,991,000	$ 2,828,000
Number of post-retirement benefit plans | postretirementBenefitPlan	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 2021	97,000
Expected future benefit payments in 2022	94,000
Expected future benefit payments in 2023	90,000
Expected future benefit payments in 2024	98,000
Expected future benefit payments in 2025	95,000
Expected future benefit payments in 2025 through 2028	351,000
Estimated plan expense	$ 29,000

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, 2020USD ($)	Dec. 31, 2019USD ($)	Dec. 31, 2018USD ($)	Dec. 31, 2020USD ($)	Dec. 31, 2019USD ($)	Dec. 31, 2018USD ($)
Change in Benefit Obligations [Roll Forward]
Benefit obligation at beginning of year	$ 1,581	$ 1,599	$ 1,874
Interest cost	46	66	77
Benefits paid	(97)	(97)	(117)
Actuarial (gain) loss				$ (7)	$ 13	$ (235)
Benefit obligation at end of period	1,523	1,581	1,599
Funded Status of Plan [Abstract]
Benefit obligation at end of period	(1,523)	(1,599)	(1,599)	(1,523)	(1,581)	(1,599)
Unamortized gain	(35)	(31)	(47)
Accrued benefit cost				$ (1,558)	$ (1,612)	$ (1,646)
Weighted average discount rate as of December 31				0.0200	0.0300	0.0425
Components of Net Periodic Benefit Cost [Abstract]
Interest cost	46	66	77
Amortization of loss	0	0	0
Other settlement income	(2)	(2)	(3)
Net periodic benefit cost	$ 44	$ 64	$ 74
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, 2020	Dec. 31, 2019
Retirement Benefits, Description [Abstract]
Unamortized net actuarial gain	$ 35	$ 31
Deferred tax expense at 21%	(7)	(7)
Net unrecognized post-retirement benefits included in accumulated other comprehensive income	28	$ 24
Portion to Be Recognized in Income in 2021
Unamortized net actuarial gain	0
Deferred tax expense at 21%	0
Net unrecognized post-retirement benefits included in accumulated other comprehensive income	$ 0

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, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance	$ 219,440	$ 216,584	$ 215,257	$ 212,508	$ 208,489	$ 204,593	$ 197,787	$ 191,542	$ 212,508	$ 191,542	$ 181,321
Reclassification adjustment for effect of enacted tax law changes											0
Other comprehensive gain (loss)	367	(1,186)	(2,176)	(629)	327	597	3,395	3,050	(3,624)	7,369	(2,095)
Ending balance	223,726	$ 219,440	$ 216,584	215,257	212,508	$ 208,489	$ 204,593	197,787	223,726	212,508	191,542
Accumulated Net Unrealized Investment Gain (Loss)
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance				$ 3,657				$ (5,051)	3,657	(5,051)	(2,901)
Unrealized gains (losses) during the period									2,866	11,247	(2,585)
Realized gains during the period									(1,155)	(224)	(137)
Related deferred taxes									(359)	(2,315)	572
Other comprehensive gain (loss)									1,352	8,708	(2,150)
Ending balance	$ 5,009				$ 3,657				$ 5,009	$ 3,657	$ (5,051)

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, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance	$ 219,440	$ 216,584	$ 215,257	$ 212,508	$ 208,489	$ 204,593	$ 197,787	$ 191,542	$ 212,508	$ 191,542	$ 181,321
Reclassification adjustment for effect of enacted tax law changes											0
Other comprehensive gain (loss)	367	(1,186)	(2,176)	(629)	327	597	3,395	3,050	(3,624)	7,369	(2,095)
Ending balance	223,726	$ 219,440	$ 216,584	215,257	212,508	$ 208,489	$ 204,593	197,787	223,726	212,508	191,542
Accumulated Net Gain (Loss) on Securities Transferred from Available-for-Sale to Held-to-Maturity
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance				$ (182)				$ (197)	(182)	(197)	(174)
Amortization of unrealized losses									62	19	(29)
Related deferred taxes									(13)	(4)	6
Other comprehensive gain (loss)									49	15	(23)
Ending balance	$ (133)				$ (182)				$ (133)	$ (182)	$ (197)

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, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	$ 219,440	$ 216,584	$ 215,257	$ 212,508	$ 208,489	$ 204,593	$ 197,787	$ 191,542	$ 212,508	$ 191,542	$ 181,321
Reclassification adjustment for effect of enacted tax law changes											0
Other comprehensive gain (loss)	367	(1,186)	(2,176)	(629)	327	597	3,395	3,050	(3,624)	7,369	(2,095)
Ending balance	223,726	$ 219,440	$ 216,584	215,257	212,508	$ 208,489	$ 204,593	197,787	223,726	212,508	191,542
Accumulated Net Gain (Loss) from Cash Flow Hedges
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance				$ 97				$ 1,438	97	1,438	1,544
Unrealized gains (losses) during the period									(6,366)	(1,697)	(134)
Related deferred taxes									1,337	356	28
Other comprehensive gain (loss)									(5,029)	(1,341)	(106)
Ending balance	$ (4,932)				$ 97				$ (4,932)	$ 97	$ 1,438

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, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance	$ 219,440	$ 216,584	$ 215,257	$ 212,508	$ 208,489	$ 204,593	$ 197,787	$ 191,542	$ 212,508	$ 191,542	$ 181,321
Reclassification adjustment for effect of enacted tax law changes											0
Other comprehensive gain (loss)	367	(1,186)	(2,176)	(629)	327	597	3,395	3,050	(3,624)	7,369	(2,095)
Ending balance	223,726	$ 219,440	$ 216,584	215,257	212,508	$ 208,489	$ 204,593	197,787	223,726	212,508	191,542
Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss)
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance				$ 24				$ 37	24	37	(147)
Unrealized gains (losses) during the period									5	(16)	233
Related deferred taxes									(1)	3	(49)
Other comprehensive gain (loss)									4	(13)	184
Ending balance	$ 28				$ 24				$ 28	$ 24	$ 37

Financial Derivative Instrume_3

Financial Derivative Instruments (Details)	12 Months Ended
	Dec. 31, 2020USD ($)instrumentderivative	Dec. 31, 2019USD ($)instrument
Interest Rate Swap
Derivative [Line Items]
Expense incurred from restructuring derivatives	$ 1,756,000
Not Designated as Hedging Instrument [Member] | Customer Loan Interest Swap
Derivative [Line Items]
Collateral posted, securities	$ 10,000,000
Cash Flow Hedging | Designated as Hedging Instrument | June 27, 2016
Derivative [Line Items]
Fixed Rate Paid	0.893%
Notional Amount	$ 20,000,000	$ 20,000,000
Fair Value	$ (76,000)	199,000
Cash Flow Hedging | Designated as Hedging Instrument | June 28, 2016
Derivative [Line Items]
Fixed Rate Paid	0.94%
Notional Amount	$ 30,000,000	30,000,000
Fair Value	$ (121,000)	278,000
Cash Flow Hedging | Designated as Hedging Instrument | June 5, 2018, Maturity Date June 5, 2020
Derivative [Line Items]
Fixed Rate Paid	2.547%
Notional Amount	$ 0	25,000,000
Fair Value	$ 0	(96,000)
Cash Flow Hedging | Designated as Hedging Instrument | June 5, 2018, Maturity Date December 5, 2020
Derivative [Line Items]
Fixed Rate Paid	2.603%
Notional Amount	$ 0	25,000,000
Fair Value	$ 0	(234,000)
Cash Flow Hedging | Designated as Hedging Instrument | Interest Rate Swap December 5, 2019, Maturity Date December 5, 2022
Derivative [Line Items]
Fixed Rate Paid	1.779%
Notional Amount	$ 0	25,000,000
Fair Value	$ 0	(98,000)
Cash Flow Hedging | Designated as Hedging Instrument | Interest Rate Swap August 2, 2019, Maturity Date August 2, 2024
Derivative [Line Items]
Fixed Rate Paid	1.59%
Notional Amount	$ 12,500,000	12,500,000
Fair Value	$ (626,000)	(11,000)
Cash Flow Hedging | Designated as Hedging Instrument | Interest Rate Swap August 5, 2019, Maturity Date August 5, 2024
Derivative [Line Items]
Fixed Rate Paid	1.42%
Notional Amount	$ 12,500,000	12,500,000
Fair Value	(550,000)	85,000
Cash Flow Hedging | Designated as Hedging Instrument | Interest Rate Swap
Derivative [Line Items]
Notional Amount	260,000,000	150,000,000
Fair Value	$ (6,242,000)	123,000
Number of Positions | derivative	11
Cash Flow Hedging | Designated as Hedging Instrument | Customer Loan Swaps
Derivative [Line Items]
Fair Value	$ 0	$ 0
Number of Positions | instrument	10	4
Derivative notional amount	$ 65,974,000	$ 32,748,000
Collateral posted, cash	3,100,000
Required collateral to be pledged	9,011,000
Cash Flow Hedging | Designated as Hedging Instrument | Customer Loan Swaps | Other Liabilities
Derivative [Line Items]
Fair Value	$ (2,640,000)	$ (1,205,000)
Number of Positions | instrument	5	2
Derivative notional amount	$ 32,987,000	$ 16,374,000
Cash Flow Hedging | Designated as Hedging Instrument | Customer Loan Swaps | Other Assets
Derivative [Line Items]
Fair Value	$ 2,640,000	$ 1,205,000
Number of Positions | instrument	5	2
Derivative notional amount	$ 32,987,000	$ 16,374,000
Cash Flow Hedging | Designated as Hedging Instrument | Interest Rate Swap Maturity Date Prior to December 31, 2021
Derivative [Line Items]
Notional Amount	$ 50,000,000
Number of Positions | instrument	2
Cash Flow Hedging | Designated as Hedging Instrument | Customer Loan Swaps Maturity Dates December 19, 2029 and October 1, 2039
Derivative [Line Items]
Number of Positions | derivative	5
Cash Flow Hedging | Designated as Hedging Instrument | Interest Rate Swap February 12, 2023
Derivative [Line Items]
Fixed Rate Paid	1.486%
Notional Amount	$ 25,000,000	0
Fair Value	$ (695,000)	0
Cash Flow Hedging | Designated as Hedging Instrument | Interest Rate Swap February 12, 2024
Derivative [Line Items]
Fixed Rate Paid	1.477%
Notional Amount	$ 25,000,000	0
Fair Value	$ (972,000)	0
Cash Flow Hedging | Designated as Hedging Instrument | Interest Rate Swap June 28, 2026
Derivative [Line Items]
Fixed Rate Paid	1.158%
Notional Amount	$ 50,000,000	0
Fair Value	$ (1,872,000)	0
Cash Flow Hedging | Designated as Hedging Instrument | Interest Rate Swap March 13, 2025
Derivative [Line Items]
Fixed Rate Paid	0.855%
Notional Amount	$ 25,000,000	0
Fair Value	$ (551,000)	0
Cash Flow Hedging | Designated as Hedging Instrument | Interest Rate Swap March 13, 2030
Derivative [Line Items]
Fixed Rate Paid	1.029%
Notional Amount	$ 20,000,000	0
Fair Value	$ (339,000)	0
Cash Flow Hedging | Designated as Hedging Instrument | Interest Rate Swap April 07, 2023
Derivative [Line Items]
Fixed Rate Paid	0.599%
Notional Amount	$ 20,000,000	0
Fair Value	$ (185,000)	0
Cash Flow Hedging | Designated as Hedging Instrument | Interest Rate Swap April 07, 2024
Derivative [Line Items]
Fixed Rate Paid	0.643%
Notional Amount	$ 20,000,000	0
Fair Value	(255,000)	$ 0
Cash Flow Hedging | Designated as Hedging Instrument | Customer Loan Interest Swap
Derivative [Line Items]
Notional Amount	$ 65,974,000
Number of Positions | derivative	5
Cash Flow Hedging | Designated as Hedging Instrument | Interest Rate Swap Maturity Date Prior to June 30, 2023
Derivative [Line Items]
Notional Amount	$ 45,000,000
Number of Positions | instrument	2
Cash Flow Hedging | Designated as Hedging Instrument | Interest Rate Swap Maturity Date Beyond June 30, 2023
Derivative [Line Items]
Notional Amount	$ 165,000,000
Number of Positions | instrument	7

Common Stock (Details)

Common Stock (Details) - USD ($) $ in Thousands	12 Months Ended			216 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2018	Dec. 31, 2017	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)	66,935
Number of shares available for future use under employee savings and investment plan (in shares)	183,065
Number of shares issued during period, employee benefit plan (in shares)	14,117	13,408	12,138
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)	15,064	11,242	9,524	293,590
Number of shares for future use (in shares)	306,410
Proceeds from sale of common stock	$ 670	$ 653	$ 619
Capital Purchase Program
Common stock
Proceeds from sale of common stock	$ 670	$ 653	$ 619

Stock Options and Stock-Based_3

Stock Options and Stock-Based Compensation - Narrative (Details) - USD ($) $ in Thousands	Apr. 28, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grants during the period (in shares)		184,487
Compensation cost related to restricted stock grants		$ 1,978
Compensation expense recognized for restricted shares		652	$ 565
Unrecognized compensation costs		$ 694	$ 600
2010 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares not issued (in shares)	215,513
2010 Plan | Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grants during the period (in shares)		76,597
2020 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares of common stock reserved for issuance (in shares)				400,000

Stock Options and Stock-Based_4

Stock Options and Stock-Based Compensation - Summary of Restricted Stock Granted (Details) - Restricted Stock - shares	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
2010 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares	76,597
Remaining Term (In Years)	1 year 3 months 18 days
2010 Plan | 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 month 6 days
2010 Plan | 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)				1 year 1 month 6 days
2010 Plan | 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)			2 years
2010 Plan | 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 month 6 days
2010 Plan | 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)			1 year
2010 Plan | 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)		1 year 1 month 6 days
2010 Plan | 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 month 6 days
2020 Plan | Year Awarded 2020 [Member] | Three Years
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting Term (In Years)	3 years
Shares	20,842
Remaining Term (In Years)	2 years 1 month 6 days
2020 Plan | Year Awarded 2020 [Member] | Two Years
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting Term (In Years)	2 years
Shares	694
Remaining Term (In Years)	1 year 1 month 6 days
2020 Plan | Year Awarded 2020 [Member] | One Year
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting Term (In Years)	1 year
Shares	5,809
Remaining Term (In Years)	3 months 18 days

Earnings Per Share (Details)

Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income (Numerator) [Abstract]
Net income as reported	$ 6,970	$ 7,095	$ 6,569	$ 6,495	$ 6,686	$ 6,288	$ 6,395	$ 6,156	$ 27,129	$ 25,525	$ 23,536
Basic EPS: Income available to common shareholders									27,129	25,525	23,536
Diluted EPS: Income available to common shareholders plus assumed conversions									$ 27,129	$ 25,525	$ 23,536
Shares (Denominator) [Abstract]
Basic EPS: Income available to common shareholders (in shares)									10,858,606	10,815,718	10,783,419
Effect of dilutive securities: restricted stock (in shares)									74,212	73,591	69,055
Diluted EPS: Income available to common shareholders plus assumed conversions (in shares)									10,932,818	10,889,309	10,852,474
Per-Share Amount [Abstract]
Basic EPS: Income available to common shareholders (in dollars per share)	$ 0.64	$ 0.65	$ 0.61	$ 0.60	$ 0.62	$ 0.58	$ 0.59	$ 0.57	$ 2.50	$ 2.36	$ 2.18
Diluted EPS: Income available to common shareholders plus assumed conversions (in dollars per share)	$ 0.63	$ 0.65	$ 0.60	$ 0.60	$ 0.60	$ 0.58	$ 0.59	$ 0.57	$ 2.48	$ 2.34	$ 2.17

Regulatory Capital Requiremen_3

Regulatory Capital Requirements (Details)	Dec. 31, 2020USD ($)	Dec. 31, 2019USD ($)
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Retained earnings from prior two years available for dividends	$ 28,008,000	$ 28,008,000
Capital conservation buffer	6.82%
Capital conservation buffer, minimum	2.50%
Tier 1 capital to risk-weighted assets [Abstract]
Actual	$ 192,760,000	178,773,000
Actual	192,760,000	178,773,000
For capital adequacy purposes		$ 56,113,000
Risk-weighted assets [Abstract]
Actual (in hundredths)		14.34%
For capital adequacy purposes (in hundredths)		4.50%
Non Consolidated
Tier 2 capital to risk-weighted asets [Abstract]
Actual	207,461,000	$ 189,421,000
For capital adequacy purposes	112,899,000	99,756,000
To be well-capitalized under prompt corrective action provisions	141,124,000	124,695,000
Tier 1 capital to risk-weighted assets [Abstract]
Actual	191,108,000	177,682,000
For capital adequacy purposes	84,675,000	74,817,000
To be well-capitalized under prompt corrective action provisions	112,899,000	99,756,000
Actual	191,108,000	177,682,000
For capital adequacy purposes	63,506,000	56,113,000
To be well-capitalized under prompt corrective action provisions	$ 91,731,000	$ 81,052,000
Risk-weighted assets [Abstract]
Actual (in hundredths)	0.1470	0.1519
For capital adequacy purposes (in hundredths)	0.0800	0.0800
To be well-capitalized under prompt corrective action provisions (in hundredths)	0.1000	0.1000
Actual (in hundredths)	0.1354	0.1425
For capital adequacy purposes (in hundredths)	0.0600	0.0600
To be well-capitalized under prompt corrective action provisions (in hundredths)	0.0800	0.0800
Actual (in hundredths)	13.54%	14.25%
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	$ 191,108,000	$ 177,682,000
For capital adequacy purpose	90,577,000	80,385,000
To be well-capitalized under prompt corrective action provisions	$ 113,221,000	$ 100,481,000
Average assets [Abstract]
Actual (in hundredths)	0.0844	0.0884
For capital adequacy purpose (in hundredths)	0.0400	0.0400
To be well-capitalized under prompt corrective action provisions (in hundredths)	0.0500	0.0500
Consolidated
Tier 2 capital to risk-weighted asets [Abstract]
Actual	$ 209,113,000	$ 190,412,000
For capital adequacy purposes	112,899,000	99,756,000
Tier 1 capital to risk-weighted assets [Abstract]
For capital adequacy purposes	84,675,000	$ 74,817,000
For capital adequacy purposes	$ 63,506,000
Risk-weighted assets [Abstract]
Actual (in hundredths)	0.1482	0.1527
For capital adequacy purposes (in hundredths)	0.0800	0.0800
Actual (in hundredths)	0.1366	0.1434
For capital adequacy purposes (in hundredths)	0.0600	0.0600
Actual (in hundredths)	13.66%
For capital adequacy purposes (in hundredths)	4.50%
Tier 1 capital to average assets [Abstract]
Actual	$ 192,760,000	$ 178,773,000
For capital adequacy purpose	$ 90,821,000	$ 80,527,000
Average assets [Abstract]
Actual (in hundredths)	0.0849	0.0888
For capital adequacy purpose (in hundredths)	0.0400	0.0400

Off-Balance-Sheet Financial I_3

Off-Balance-Sheet Financial Instruments and Concentrations of Credit Risk (Details)	12 Months Ended
	Dec. 31, 2020USD ($)derivative	Dec. 31, 2019USD ($)
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Off-balance-sheet financial instruments	$ 231,756,000	$ 195,577,000
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	11
Notional principal amounts	$ 260,000,000	150,000,000
Unrealized loss on derivative	$ 4,932,000
Designated as Hedging Instrument | Customer Loan Interest Swap | Cash Flow Hedging
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Number of derivative instruments (derivative) | derivative	5
Notional principal amounts	$ 65,974,000
Unused lines, collateralized by residential real estate
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Off-balance-sheet financial instruments	89,852,000	81,193,000
Other unused commitments
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Off-balance-sheet financial instruments	102,963,000	90,186,000
Standby letters of credit
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Off-balance-sheet financial instruments	4,415,000	4,496,000
Commitments to extend credit
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Off-balance-sheet financial instruments	$ 34,526,000	$ 19,702,000

Fair Value Disclosures - Assets

Fair Value Disclosures - Assets and Liabilities Recorded on a Recurring and Nonrecurring Basis (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	$ 313,376	$ 360,520
Mortgage servicing rights, impairment reserve	358	0
Allowance for loan losses, other real estate owned	45	0	$ 0	$ 53
Allowance for impaired loans	304	1,916
Mortgage servicing rights	1,985	2,089
Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgage servicing rights	0	0
Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgage servicing rights	1,985	2,089
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgage servicing rights	0	0
Estimate of Fair Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgage servicing rights	1,985	2,089
U.S. government-sponsored agencies
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	22,730	7,398
Mortgage-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	243,406	326,617
State and political subdivisions
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	39,474	26,505
Asset-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	7,766
Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest rate swap agreements	2,640	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	0
Interest rate swap agreements	0	0
Derivative liabilities	0	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	313,376	360,520
Interest rate swap agreements	2,640	1,767
Derivative liabilities	8,882	1,644
Assets measured at fair value	316,016	362,287
Fair Value, Measurements, Recurring | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	0	0
Interest rate swap agreements	0	0
Derivative liabilities	0	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	313,376	360,520
Derivative liabilities	8,882	1,644
Assets measured at fair value	316,016	362,287
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
Derivative liabilities	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
Derivative liabilities	6,242	439
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
Derivative liabilities	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
Derivative liabilities	6,242	439
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	2,640	1,205
Derivative liabilities	2,640	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	0
Derivative liabilities	0	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	2,640	1,205
Derivative liabilities	2,640	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	0
Derivative liabilities	0	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	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	22,730	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	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	22,730	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	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	243,406	326,617
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	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	243,406	326,617
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	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	39,474	26,505
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	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	39,474	26,505
Fair Value, Measurements, Recurring | Asset-backed securities | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	0
Fair Value, Measurements, Recurring | Asset-backed securities | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	7,766
Fair Value, Measurements, Recurring | Asset-backed securities | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	0
Fair Value, Measurements, Recurring | Asset-backed securities | Estimate of Fair Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	7,766
Fair Value, Measurements, Nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other real estate owned	908	279
Impaired loans	794	6,579
Assets measured at fair value	3,687	8,947
Fair Value, Measurements, Nonrecurring | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgage servicing rights	0	0
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]
Mortgage servicing rights	1,985	2,089
Other real estate owned	908	279
Impaired loans	794	6,579
Assets measured at fair value	3,687	8,947
Fair Value, Measurements, Nonrecurring | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgage servicing rights	0	0
Other real estate owned	0	0
Impaired loans	0	0
Assets measured at fair value	0	0
Fair Value, Measurements, Nonrecurring | Estimate of Fair Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgage servicing rights	$ 1,985	$ 2,089

Fair Value Disclosures - Carryi

Fair Value Disclosures - Carrying Amounts and Estimated Fair Values (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019
Financial assets
Securities to be held to maturity, fair value	$ 377,134				$ 287,045
Loans (net of allowance for loan losses)
Mortgage servicing rights	1,985				2,089
Financial liabilities
Certificates of deposit	605,585				689,979
Total deposits	1,844,611	$ 1,763,059	$ 1,740,121	$ 1,644,612	1,650,466	$ 1,623,290	$ 1,592,956	$ 1,606,875
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
Other borrowed funds	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	377,134				287,045
Loans (net of allowance for loan losses)
Loans	794				6,579
Mortgage servicing rights	1,985				2,089
Financial liabilities
Certificates of deposit	253,892				281,480
National certificates of deposit	359,899				412,337
Total deposits	613,791				693,817
Repurchase agreements	69,497				37,450
Other borrowed funds	194,469				140,063
Total borrowed funds	263,966				177,513
Level 2 | Commercial | Real estate
Loans (net of allowance for loan losses)
Loans	347				2
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				5,046
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	442				577
Level 2 | Home equity line of credit
Loans (net of allowance for loan losses)
Loans	0				954
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	1,475,898				1,269,106
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
Other borrowed funds	0				0
Total borrowed funds	0				0
Level 3 | Commercial | Real estate
Loans (net of allowance for loan losses)
Loans	440,388				364,624
Level 3 | Commercial | Construction
Loans (net of allowance for loan losses)
Loans	56,388				37,366
Level 3 | Commercial | Other
Loans (net of allowance for loan losses)
Loans	279,496				207,502
Level 3 | Municipal
Loans (net of allowance for loan losses)
Loans	44,440				40,552
Level 3 | Residential | Construction
Loans (net of allowance for loan losses)
Loans	21,890				14,786
Level 3 | Residential | Term
Loans (net of allowance for loan losses)
Loans	532,617				490,782
Level 3 | Home equity line of credit
Loans (net of allowance for loan losses)
Loans	77,177				90,005
Level 3 | Consumer
Loans (net of allowance for loan losses)
Loans	23,502				23,489
Carrying Amount
Financial assets
Securities to be held to maturity, fair value	365,613				281,606
Loans (net of allowance for loan losses)
Loans	1,460,508				1,285,436
Mortgage servicing rights	1,956				1,546
Financial liabilities
Certificates of deposit	250,264				285,602
National certificates of deposit	355,321				404,377
Total deposits	605,585				689,979
Repurchase agreements	69,340				37,450
Other borrowed funds	192,698				147,505
Total borrowed funds	262,038				184,955
Carrying Amount | Commercial | Real estate
Loans (net of allowance for loan losses)
Loans	436,161				368,645
Carrying Amount | Commercial | Construction
Loans (net of allowance for loan losses)
Loans	55,803				37,678
Carrying Amount | Commercial | Other
Loans (net of allowance for loan losses)
Loans	281,057				215,068
Carrying Amount | Municipal
Loans (net of allowance for loan losses)
Loans	43,586				41,258
Carrying Amount | Residential | Construction
Loans (net of allowance for loan losses)
Loans	21,483				14,785
Carrying Amount | Residential | Term
Loans (net of allowance for loan losses)
Loans	519,101				491,315
Carrying Amount | Home equity line of credit
Loans (net of allowance for loan losses)
Loans	78,356				91,149
Carrying Amount | Consumer
Loans (net of allowance for loan losses)
Loans	24,961				25,538
Estimate of Fair Value
Financial assets
Securities to be held to maturity, fair value	377,134				287,045
Loans (net of allowance for loan losses)
Loans	1,476,692				1,275,685
Mortgage servicing rights	1,985				2,089
Financial liabilities
Certificates of deposit	253,892				281,480
National certificates of deposit	359,899				412,337
Total deposits	613,791				693,817
Repurchase agreements	69,497				37,450
Other borrowed funds	194,469				140,063
Total borrowed funds	263,966				177,513
Estimate of Fair Value | Commercial | Real estate
Loans (net of allowance for loan losses)
Loans	440,735				364,626
Estimate of Fair Value | Commercial | Construction
Loans (net of allowance for loan losses)
Loans	56,388				37,366
Estimate of Fair Value | Commercial | Other
Loans (net of allowance for loan losses)
Loans	279,501				212,548
Estimate of Fair Value | Municipal
Loans (net of allowance for loan losses)
Loans	44,440				40,552
Estimate of Fair Value | Residential | Construction
Loans (net of allowance for loan losses)
Loans	21,890				14,786
Estimate of Fair Value | Residential | Term
Loans (net of allowance for loan losses)
Loans	533,059				491,359
Estimate of Fair Value | Home equity line of credit
Loans (net of allowance for loan losses)
Loans	77,177				90,959
Estimate of Fair Value | Consumer
Loans (net of allowance for loan losses)
Loans	$ 23,502				$ 23,489

Other Operating Income and Ex_3

Other Operating Income and Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Other operating expense
Advertising and marketing expense	$ 983	$ 1,174	$ 1,165
Accounting and auditing expenses	788	828	837
ATM and interchange expense	1,253	1,176	995
Swap termination expense	1,756	0	0
ATM and debit card income
Other operating income
Other operating income	4,138	3,956	3,556
Loan processing fees
Other operating income
Other operating income	$ 1,200	$ 812	$ 711

Condensed Financial Informati_3

Condensed Financial Information of Parent (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Assets
Premises and equipment	$ 27,251				$ 21,305				$ 27,251	$ 21,305
Goodwill	30,646				29,805				30,646	29,805
Other assets	54,873				47,799				54,873	47,799
Total assets	2,361,236	$ 2,296,626	$ 2,267,124	$ 2,136,396	2,068,796	$ 2,033,227	$ 1,998,699	$ 1,991,345	2,361,236	2,068,796
Liabilities and shareholders' equity
Other liabilities	30,861	30,340	31,614	28,487	20,867	20,031	19,292	16,264	30,861	20,867
Total liabilities	2,137,510				1,856,288				2,137,510	1,856,288
Shareholders' equity
Common stock	110				109				110	109
Additional paid-in capital	65,285				63,964				65,285	63,964
Retained earnings	158,359				144,839				158,359	144,839
Total shareholders' equity	223,726	219,440	216,584	215,257	212,508	208,489	204,593	197,787	223,726	212,508	$ 191,542	$ 181,321
Total liabilities and shareholders' equity	2,361,236	2,296,626	2,267,124	2,136,396	2,068,796	2,033,227	1,998,699	1,991,345	2,361,236	2,068,796
Statements of Income
Net securities gains									1,155	224	137
Income before income taxes	8,255	8,474	7,825	7,696	7,947	7,468	7,575	7,270	32,250	30,260	27,842
Applicable tax expense	1,285	1,379	1,256	1,201	1,261	1,180	1,180	1,114	5,121	4,735	4,306
Equity in earnings of Bank
Net income	6,970	7,095	6,569	6,495	6,686	6,288	6,395	6,156	27,129	25,525	23,536
Cash flows from operating activities
Net income	6,970	$ 7,095	$ 6,569	6,495	6,686	$ 6,288	$ 6,395	6,156	27,129	25,525	23,536
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation									2,221	1,938	1,792
Equity compensation expense									652	565	381
Gain on sale of investments									(1,155)	(224)	(137)
(Increase) decrease in other assets									(17,737)	(7,690)	1,146
Decrease in other liabilities									9,347	2,802	3,848
Net cash provided by operating activities									22,698	26,053	33,840
Cash flows from investing activities
Proceeds from maturities, payments, calls of securities available for sale									141,598	78,825	51,752
Capital expenditures									(2,540)	(1,573)	(1,484)
Net cash used in investing activities									(250,071)	(116,280)	(112,077)
Cash flows from financing activities
Purchase of common stock									(156)	(183)	(168)
Proceeds from sale of common stock									670	653	619
Dividends paid									(13,329)	(12,963)	(12,052)
Net cash provided by financing activities									239,152	85,526	78,164
Parent Company
Assets
Cash and cash equivalents	1,287				1,028				1,287	1,028
Dividends receivable	3,400				3,200				3,400	3,200
Investment in subsidiary	194,515				183,654				194,515	183,654
Goodwill	27,559				27,559				27,559	27,559
Other assets	360				337				360	337
Total assets	227,121				215,778				227,121	215,778
Liabilities and shareholders' equity
Dividends payable	3,395				3,270				3,395	3,270
Other liabilities	0				0				0	0
Total liabilities	3,395				3,270				3,395	3,270
Shareholders' equity
Common stock	110				109				110	109
Additional paid-in capital	65,285				63,964				65,285	63,964
Retained earnings	158,331				148,435				158,331	148,435
Total shareholders' equity	223,726				212,508				223,726	212,508
Total liabilities and shareholders' equity	227,121				215,778				227,121	215,778
Statements of Income
Net securities gains									0	0	137
Other operating income									8	0	0
Total income									8	0	137
Occupancy expense									0	1	2
Other operating expense									911	826	652
Total expense									911	827	654
Income before income taxes									(903)	(827)	(517)
Applicable tax expense									(246)	(230)	(164)
Loss before Bank earnings									(657)	(597)	(353)
Equity in earnings of Bank
Remitted									13,300	12,600	11,300
Unremitted									14,486	13,522	12,589
Net income									27,129	25,525	23,536
Cash flows from operating activities
Net income									27,129	25,525	23,536
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation									0	2	0
Equity compensation expense									652	565	381
Gain on sale of investments									0	0	(137)
(Increase) decrease in other assets									(21)	(105)	81
Increase in dividends receivable									(200)	(250)	(450)
Increase in dividends payable									0	120	551
Decrease in other liabilities									0	(4)	0
Unremitted earnings of Bank									(14,486)	(13,522)	(12,589)
Net cash provided by operating activities									13,074	12,331	11,373
Cash flows from investing activities
Proceeds from maturities, payments, calls of securities available for sale									0	0	459
Capital expenditures									0	0	1
Net cash used in investing activities									0	0	460
Cash flows from financing activities
Purchase of common stock									(156)	(183)	(168)
Proceeds from sale of common stock									670	653	619
Dividends paid									(13,329)	(12,963)	(12,052)
Net cash provided by financing activities									(12,815)	(12,493)	(11,601)
Net increase (decrease) in cash and cash equivalents									259	(162)	232
Cash and cash equivalents at beginning of year				$ 1,028				$ 1,190	1,028	1,190	958
Cash and cash equivalents at end of year	$ 1,287				$ 1,028				$ 1,287	$ 1,028	$ 1,190

Quarterly Information (Details)

Quarterly Information (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Balance Sheets
Cash and cash equivalents	$ 26,212	$ 22,742	$ 22,143	$ 21,117	$ 14,433	$ 21,418	$ 16,918	$ 15,270	$ 26,212	$ 14,433	$ 19,134	$ 19,207
Interest-bearing deposits in other banks	56,151	48,111	21,907	6,047	11,310	16,714	917	231	56,151	11,310
Investments	678,989	672,102	653,462	654,520	642,126	625,584	625,097	606,495	678,989	642,126
Restricted equity securities	10,545	10,545	10,545	9,994	8,982	8,982	8,982	8,982	10,545	8,982
Net loans and loans held for sale	1,466,363	1,427,662	1,442,463	1,332,911	1,285,590	1,252,546	1,237,661	1,253,585	1,466,363	1,285,590
Other assets	122,976	115,464	116,604	111,807	106,355	107,983	109,124	106,782	122,976	106,355
Total assets	2,361,236	2,296,626	2,267,124	2,136,396	2,068,796	2,033,227	1,998,699	1,991,345	2,361,236	2,068,796
Deposits	1,844,611	1,763,059	1,740,121	1,644,612	1,650,466	1,623,290	1,592,956	1,606,875	1,844,611	1,650,466
Borrowed funds	262,038	283,787	278,805	248,040	184,955	181,417	181,858	170,419	262,038	184,955
Other liabilities	30,861	30,340	31,614	28,487	20,867	20,031	19,292	16,264	30,861	20,867
Shareholders' equity	223,726	219,440	216,584	215,257	212,508	208,489	204,593	197,787	223,726	212,508	191,542	$ 181,321
Total liabilities and shareholders' equity	2,361,236	2,296,626	2,267,124	2,136,396	2,068,796	2,033,227	1,998,699	1,991,345	2,361,236	2,068,796
Statements of Income
Interest income	19,133	18,506	18,786	20,694	19,657	19,904	19,822	19,268	77,119	78,651	70,543
Interest expense	3,454	3,761	4,295	5,776	6,239	6,678	6,872	6,369	17,286	26,158	20,334
Net interest income	15,679	14,745	14,491	14,918	13,418	13,226	12,950	12,899	59,833	52,493	50,209
Provision for loan losses	1,500	1,800	2,350	400	375	250	250	375	6,050	1,250	1,500
Net interest income after provision for loan losses	14,179	12,945	12,141	14,518	13,043	12,976	12,700	12,524	53,783	51,243	48,709
Non-interest income	4,492	4,805	4,601	4,221	3,908	3,532	3,605	3,144	18,119	14,189	12,600
Non-interest expense	10,416	9,276	8,917	11,043	9,004	9,040	8,730	8,398	39,652	35,172	33,467
Income before income taxes	8,255	8,474	7,825	7,696	7,947	7,468	7,575	7,270	32,250	30,260	27,842
Applicable tax expense	1,285	1,379	1,256	1,201	1,261	1,180	1,180	1,114	5,121	4,735	4,306
Net income	$ 6,970	$ 7,095	$ 6,569	$ 6,495	$ 6,686	$ 6,288	$ 6,395	$ 6,156	$ 27,129	$ 25,525	$ 23,536
Basic earnings per common share (in usd per share)	$ 0.64	$ 0.65	$ 0.61	$ 0.60	$ 0.62	$ 0.58	$ 0.59	$ 0.57	$ 2.50	$ 2.36	$ 2.18
Diluted earnings per common share (in usd per share)	$ 0.63	$ 0.65	$ 0.60	$ 0.60	$ 0.60	$ 0.58	$ 0.59	$ 0.57	$ 2.48	$ 2.34	$ 2.17
Other comprehensive income (loss), net of tax
Net unrealized gain (loss) on securities available for sale	$ (511)	$ (1,580)	$ (790)	$ 4,233	$ (29)	$ 936	$ 4,289	$ 3,512	$ 1,352	$ 8,708	$ (2,150)
Net unrealized gain on securities transferred from available for sale to held to maturity, net of tax	6	7	28	8	7	1	4	3	49	15	(23)
Net loss on cash flow hedging derivative instruments	868	387	(1,414)	(4,870)	362	(340)	(898)	(465)	(5,029)	(1,341)	(106)
Unrecognized gain (loss) on postretirement benefit costs	4	0	0	0	(13)	0	0	0	4	(13)	184
Other comprehensive gain (loss)	367	(1,186)	(2,176)	(629)	327	597	3,395	3,050	(3,624)	7,369	(2,095)
Comprehensive income	$ 7,337	$ 5,909	$ 4,393	$ 5,866	$ 7,013	$ 6,885	$ 9,790	$ 9,206	$ 23,505	$ 32,894	$ 21,441

Acquisitions and Intangible A_3

Acquisitions and Intangible Assets - Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 11, 2020
Business Acquisition [Line Items]
Goodwill	$ 30,646	$ 29,805
Operating lease asset	511	0
Net lease liability	511	0		$ 511
Acquisition-related costs	310	0	$ 0
Amortization of identified intangibles	43	43	43
Belfast, Maine Branch
Business Acquisition [Line Items]
Deposits				19,261
Loans & accrued interest				23,138
Goodwill				841
Goodwill expected to be deductible for income tax purposes				841
Core deposit intangible				262
Operating lease asset				511
Acquisition-related costs	$ 310
Belfast, Maine Branch | Core Deposits
Business Acquisition [Line Items]
Core deposit intangible				$ 262
Intangible assets useful life	10 years
Amortization of identified intangibles	$ 26
Bank Acquisitions From Camden National Bank | Core Deposits
Business Acquisition [Line Items]
Intangible assets useful life	10 years
Amortization of identified intangibles	$ 43	$ 43	$ 43
Yearly amortization expense until fully amortized	$ 43

Acquisitions and Intangible A_4

Acquisitions and Intangible Assets - Summary of Consideration Paid (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 11, 2020	Dec. 31, 2019
Assets
Goodwill	$ 30,646		$ 29,805
Belfast, Maine Branch
Assets
Cash		$ 381
Loans & accrued interest		23,138
Premises and equipment		696
Prepaid expenses		10
Core deposit intangible		262
Goodwill		841
Liabilities
Deposits		19,261
Other liabilities		$ 7