The First Bancorp, Inc. (FNLC) 10-Q 5 Nov 21 2021 Q3 Quarterly report Financial data

Cover

Cover - shares	9 Months Ended
	Sep. 30, 2021	Nov. 01, 2021
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2021
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	Main Street
Entity Address, City or Town	Damariscotta
Entity Address, State or Province	ME
Entity Address, Postal Zip Code	04543
City Area Code	207
Local Phone Number	563-3195
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		10,996,274
Entity Central Index Key	0000765207
Current Fiscal Year End Date	--12-31
Document Transition Report	false
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q3
Amendment Flag	false

Consolidated Balance Sheets (Un

Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020	Sep. 30, 2020
Assets
Cash and cash equivalents	$ 27,126	$ 26,212	$ 22,742
Interest bearing deposits in other banks	93,779	56,151	48,111
Securities available for sale	309,224	313,376	340,140
Securities to be held to maturity (fair value of $379,797,000 at September 30, 2021, $377,134,000 at December 31, 2020 and $342,062,000 at September 30, 2020)	375,699	365,613	331,962
Restricted equity securities, at cost	8,839	10,545	10,545
Loans held for sale	1,437	5,855	6,387
Loans	1,617,212	1,476,761	1,436,646
Less allowance for loan losses	17,507	16,253	15,371
Net loans	1,599,705	1,460,508	1,421,275
Accrued interest receivable	8,380	9,298	10,249
Premises and equipment, net	29,106	27,251	27,110
Other real estate owned	0	908	777
Goodwill	30,646	30,646	29,805
Other assets	45,650	54,873	47,523
Total assets	2,529,591	2,361,236	2,296,626
Liabilities
Demand deposits	354,899	250,219	248,444
NOW deposits	625,294	520,385	492,223
Money market deposits	190,420	163,819	156,948
Savings deposits	348,033	304,603	275,513
Certificates of deposit	514,567	605,585	589,931
Total deposits	2,033,213	1,844,611	1,763,059
Borrowed funds – short term	178,109	206,940	228,687
Borrowed funds – long term	55,092	55,098	55,100
Other liabilities	24,440	30,861	30,340
Total liabilities	2,290,854	2,137,510	2,077,186
Shareholders' equity
Common stock, one cent par value per share	110	110	109
Additional paid-in capital	66,471	65,285	64,943
Retained earnings	174,391	158,359	154,783
Accumulated other comprehensive income (loss)
Net unrealized gain (loss) on securities available for sale	(627)	5,009	5,520
Net unrealized loss on securities transferred from available for sale to held to maturity	(99)	(133)	(139)
Net unrealized loss on cash flow hedging derivative instruments	(1,537)	(4,932)	(5,800)
Net unrealized gain on postretirement costs	28	28	24
Total shareholders' equity	238,737	223,726	219,440
Total liabilities & shareholders' equity	$ 2,529,591	$ 2,361,236	$ 2,296,626
Common Stock
Number of shares authorized (in shares)	18,000,000	18,000,000	18,000,000
Number of shares issued (in shares)	10,992,950	10,950,289	10,942,959
Number of shares outstanding (in shares)	10,992,950	10,950,289	10,942,959
Book value per common share (usd per share)	$ 21.72	$ 20.43	$ 20.05
Tangible book value per common share (usd per share)	$ 18.90	$ 17.60	$ 17.32

Consolidated Balance Sheets (_2

Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020	Sep. 30, 2020
Assets [Abstract]
Securities to be held to maturity, fair value	$ 379,797	$ 377,134	$ 342,062
Stockholders' Equity [Abstract]
Common stock par value (usd per share)	$ 0.01	$ 0.01	$ 0.01

Consolidated Statements of Inco

Consolidated Statements of Income and Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Interest income
Interest and fees on loans (includes tax-exempt income of $832,000 YTD September 30, 2021 and $899,000 YTD September 30, 2020)	$ 15,905	$ 14,109	$ 45,864	$ 44,124
Interest on deposits with other banks	21	8	45	87
Interest and dividends on investments (includes tax-exempt income of $5,798,000 YTD September 30, 2021 and $5,649,000 YTD September 30, 2020)	3,662	4,389	11,173	13,775
Total interest income	19,588	18,506	57,082	57,986
Interest expense
Interest on deposits	1,650	2,866	5,796	11,613
Interest on borrowed funds	927	895	2,679	2,219
Total interest expense	2,577	3,761	8,475	13,832
Net interest income	17,011	14,745	48,607	44,154
Provision for loan losses	525	1,800	1,575	4,550
Net interest income after provision for loan losses	16,486	12,945	47,032	39,604
Non-interest income
Net securities gains (losses)	(142)	0	22	1,179
Other operating income	607	543	1,852	1,636
Total non-interest income	4,375	4,805	14,584	13,627
Non-interest expense
Salaries and employee benefits	5,424	5,032	15,600	14,719
Occupancy expense	735	709	2,148	2,117
Furniture and equipment expense	1,135	1,184	3,535	3,438
FDIC insurance premiums	209	189	600	548
Amortization of identified intangibles	17	10	52	32
Other operating expense	2,412	2,152	7,367	8,382
Total non-interest expense	9,932	9,276	29,302	29,236
Income before income taxes	10,929	8,474	32,314	23,995
Income tax expense	1,915	1,379	5,591	3,836
NET INCOME	$ 9,014	$ 7,095	$ 26,723	$ 20,159
Basic earnings per common share (usd per share)	$ 0.83	$ 0.65	$ 2.45	$ 1.86
Diluted earnings per common share (usd per share)	$ 0.82	$ 0.65	$ 2.43	$ 1.84
Other comprehensive income (loss) net of tax
Net unrealized gain (loss) on securities available for sale, net of taxes	$ (1,817)	$ (1,580)	$ (5,636)	$ 1,863
Net unrealized gain on transferred securities, net of taxes	14	7	34	43
Net unrealized gain (loss) on cash flow hedging derivative instruments, net of taxes	546	387	3,395	(5,897)
Other comprehensive loss	(1,257)	(1,186)	(2,207)	(3,991)
Comprehensive income	7,757	5,909	24,516	16,168
Investment management and fiduciary income
Non-interest income
Non-interest income	1,135	909	3,352	2,712
Service charges on deposit accounts
Non-interest income
Non-interest income	413	375	1,132	1,257
Mortgage origination and servicing income, net of amortization
Non-interest income
Non-interest income	1,030	1,914	4,351	3,802
Debit card income
Non-interest income
Non-interest income	$ 1,332	$ 1,064	$ 3,875	$ 3,041

Consolidated Statements of In_2

Consolidated Statements of Income and Comprehensive Income (Unaudited) (Parenthetical) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Income Statement [Abstract]
Interest and fees on loans (tax-exempt income)	$ 832	$ 899
Interest and dividends on investments (tax-exempt income)	$ 5,798	$ 5,649

Consolidated Statements of Chan

Consolidated Statements of Changes in Shareholders' Equity (Unaudited) - USD ($) $ in Thousands	Total	Common stock and additional paid-in capital	Retained earnings	Accumulated other comprehensive income (loss)
Beginning balance (in shares) at Dec. 31, 2019		10,899,210
Balance at beginning of period at Dec. 31, 2019	$ 212,508	$ 64,073	$ 144,839	$ 3,596
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	20,159		20,159
Net unrealized gain (loss) on securities available for sale, net of tax	1,863			1,863
Net unrealized gain on securities transferred from available for sale to held to maturity, net of tax	43			43
Net unrealized gain (loss) on cash flow hedging derivative instruments, net of tax	(5,897)			(5,897)
Comprehensive income (loss)	16,168		20,159	(3,991)
Cash dividend declared	(10,058)		(10,058)
Equity compensation expense	482	$ 482
Payment to repurchase common stock (in shares)		(5,447)
Payment to repurchase common stock	(157)		(157)
Issuance of restricted stock (in shares)		27,345
Proceeds from sale of common stock (in shares)		21,851
Proceeds from sale of common stock	$ 497	$ 497
Ending balance (in shares) at Sep. 30, 2020	10,942,959	10,942,959
Balance at end of period at Sep. 30, 2020	$ 219,440	$ 65,052	154,783	(395)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	7,095
Net unrealized gain (loss) on securities available for sale, net of tax	(1,580)
Net unrealized gain on securities transferred from available for sale to held to maturity, net of tax	7
Net unrealized gain (loss) on cash flow hedging derivative instruments, net of tax	387
Comprehensive income (loss)	$ 5,909
Ending balance (in shares) at Sep. 30, 2020	10,942,959	10,942,959
Balance at end of period at Sep. 30, 2020	$ 219,440	$ 65,052	154,783	(395)
Beginning balance (in shares) at Dec. 31, 2020	10,950,289	10,950,289
Balance at beginning of period at Dec. 31, 2020	$ 223,726	$ 65,395	158,359	(28)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	26,723		26,723
Net unrealized gain (loss) on securities available for sale, net of tax	(5,636)			(5,636)
Net unrealized gain on securities transferred from available for sale to held to maturity, net of tax	34			34
Net unrealized gain (loss) on cash flow hedging derivative instruments, net of tax	3,395			3,395
Comprehensive income (loss)	24,516		26,723	(2,207)
Cash dividend declared	(10,438)		(10,438)
Equity compensation expense	672	$ 672
Payment to repurchase common stock (in shares)		(10,252)
Payment to repurchase common stock	(253)		(253)
Issuance of restricted stock (in shares)		34,689
Proceeds from sale of common stock (in shares)		18,224
Proceeds from sale of common stock	$ 514	$ 514
Ending balance (in shares) at Sep. 30, 2021	10,992,950	10,992,950
Balance at end of period at Sep. 30, 2021	$ 238,737	$ 66,581	174,391	(2,235)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	9,014
Net unrealized gain (loss) on securities available for sale, net of tax	(1,817)
Net unrealized gain on securities transferred from available for sale to held to maturity, net of tax	14
Net unrealized gain (loss) on cash flow hedging derivative instruments, net of tax	546
Comprehensive income (loss)	$ 7,757
Ending balance (in shares) at Sep. 30, 2021	10,992,950	10,992,950
Balance at end of period at Sep. 30, 2021	$ 238,737	$ 66,581	$ 174,391	$ (2,235)

Consolidated Statements of Ch_2

Consolidated Statements of Changes in Shareholders' Equity (Unaudited) (Parenthetical) - $ / shares	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Statement of Stockholders' Equity [Abstract]
Cash dividends declared (usd per share)	$ 0.95	$ 0.92

Consolidated Statements of Cash

Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Cash flows from operating activities
Net income	$ 26,723	$ 20,159
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation	1,540	1,670
Change in deferred taxes	483	(24)
Provision for loan losses	1,575	4,550
Loans originated for resale	(89,166)	(53,772)
Proceeds from sales and transfers of loans	96,227	49,941
Net gain on sales of loans	(2,643)	(2,402)
Net gain on sale or call of securities	(22)	(1,179)
Net amortization of premiums on investments	1,801	1,425
Net (gain) loss on sale of other real estate owned	(91)	5
Provision for losses on other real estate owned	0	45
Equity compensation expense	672	482
Net (increase) decrease in other assets and accrued interest	14,364	(9,757)
Net increase (decrease) in other liabilities	(6,522)	9,579
Net (gain) loss on disposal of premises and equipment	2	(3)
Amortization of investment in limited partnership	232	313
Net acquisition amortization	52	32
Net cash provided by operating activities	45,227	21,064
Cash flows from investing activities
Increase in interest-bearing deposits in other banks	(37,628)	(36,801)
Proceeds from sales of securities available for sale	19,435	70,869
Proceeds from maturities, payments and calls of securities available for sale	85,989	90,809
Proceeds from maturities, payments, calls and sales of securities to be held to maturity	70,217	62,916
Proceeds from sales of other real estate owned	999	279
Purchases of securities available for sale	(109,835)	(139,353)
Purchases of securities to be held to maturity	(80,610)	(113,052)
Redemption of restricted equity securities	1,706	0
Purchase of restricted equity securities	0	(1,563)
Net increase in loans	(140,772)	(141,216)
Capital expenditures	(3,412)	(7,475)
Proceeds from disposal of premises and equipment	0	3
Net cash used by investing activities	(193,911)	(214,584)
Cash flows from financing activities
Net increase in demand, savings, and money market accounts	279,620	212,641
Net decrease in certificates of deposit	(91,018)	(100,048)
Net increase (decrease) in short-term borrowings	(28,831)	53,837
Advances on long-term borrowings	0	55,000
Repayment on long-term borrowings	(6)	(10,005)
Payment to repurchase common stock	(253)	(157)
Proceeds from sale of common stock	514	497
Dividends paid	(10,428)	(9,936)
Net cash provided by financing activities	149,598	201,829
Net increase in cash and cash equivalents	914	8,309
Cash and cash equivalents at beginning of period	26,212	14,433
Cash and cash equivalents at end of period	27,126	22,742
Interest paid	8,887	14,066
Income taxes paid	4,573	3,917
Non-cash transactions
Net transfer from loans to other real estate owned	$ 0	$ 827

Basis of Presentation

Basis of Presentation	9 Months Ended
	Sep. 30, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	Basis of Presentation The First Bancorp, Inc. ("the Company") is a financial holding company that owns all of the common stock of First National Bank ("the Bank"). The accompanying unaudited consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America ("GAAP") for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by GAAP for complete financial statements. In the opinion of Management, all adjustments (consisting of normally recurring accruals) considered necessary for a fair presentation have been included. All significant intercompany transactions and balances are eliminated in consolidation. The income reported for the 2021 period is not necessarily indicative of the results that may be expected for the year ending December 31, 2021. For further information, refer to the consolidated financial statements and notes included in the Company's annual report on Form 10-K for the year ended December 31, 2020. Risks and Uncertainties In March 2020 the World Health Organization declared a worldwide pandemic as a result of the outbreak of coronavirus disease 2019 ("COVID-19"). The impact of COVID-19 continues to cause varying levels of disruption and uncertainty in the local, national, and world economies. To curtail spread of the virus, governments at all levels encouraged social distancing and many imposed restrictions on travel and group meetings, and/or mandated shut-downs of all but essential businesses. Vaccination efforts have led to a general re-opening of the economy with few remaining restrictions. The Company’s business, financial condition, and results of operations generally rely upon the ability of the Bank’s borrowers to repay their loans, the value of collateral underlying the Bank’s secured loans, and demand for loans and other products and services the Bank offers, which are highly dependent on the business environment in the Bank’s primary markets where it operates and in the United States as a whole. The Bank's primary market is the State of Maine, which relies upon tourism for a significant percentage of its economic activity. In 2020, COVID-19 adversely impacted the tourism industry to a greater degree than other industries; early data and anecdotal evidence suggest a strong rebound in tourism in 2021, limited in some cases by available labor. The highly transmissible Delta variant of COVID-19 has become the dominant strain with regional outbreaks occurring resulting in varying levels of disruption. The severity of these outbreaks or potential future outbreaks could have an impact on the Company's operating results, though the degree is indeterminable at this time. Subsequent Events Events occurring subsequent to September 30, 2021, have been evaluated as to their potential impact to the financial statements.

Investment Securities

Investment Securities	9 Months Ended
	Sep. 30, 2021
Investments, Debt and Equity Securities [Abstract]
Investment Securities	Investment Securities The following table summarizes the amortized cost and estimated fair value of investment securities at September 30, 2021: Amortized Unrealized Gains Unrealized Losses Fair Value (Estimated) Securities available for sale U.S. Government-sponsored agencies $ 23,045,000 $ — $ (1,106,000) $ 21,939,000 Mortgage-backed securities 247,606,000 2,751,000 (3,104,000) 247,253,000 State and political subdivisions 34,590,000 895,000 (306,000) 35,179,000 Asset-backed securities 4,777,000 76,000 — 4,853,000 $ 310,018,000 $ 3,722,000 $ (4,516,000) $ 309,224,000 Securities to be held to maturity U.S. Government-sponsored agencies $ 35,600,000 $ 17,000 $ (1,161,000) $ 34,456,000 Mortgage-backed securities 64,651,000 354,000 (1,701,000) 63,304,000 State and political subdivisions 254,198,000 7,251,000 (1,042,000) 260,407,000 Corporate securities 21,250,000 415,000 (35,000) 21,630,000 $ 375,699,000 $ 8,037,000 $ (3,939,000) $ 379,797,000 Restricted equity securities Federal Home Loan Bank Stock $ 7,802,000 $ — $ — $ 7,802,000 Federal Reserve Bank Stock 1,037,000 — — 1,037,000 $ 8,839,000 $ — $ — $ 8,839,000 The following table summarizes the amortized cost and estimated fair value of investment securities at December 31, 2020: Amortized Unrealized Gains Unrealized Losses Fair Value (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 The following table summarizes the amortized cost and estimated fair value of investment securities at September 30, 2020: Amortized Unrealized Gains Unrealized Losses Fair Value (Estimated) Securities available for sale U.S. Government-sponsored agencies $ 27,545,000 $ 180,000 $ (228,000) $ 27,497,000 Mortgage-backed securities 270,336,000 6,737,000 (649,000) 276,424,000 State and political subdivisions 35,271,000 1,240,000 (292,000) 36,219,000 $ 333,152,000 $ 8,157,000 $ (1,169,000) $ 340,140,000 Securities to be held to maturity U.S. Government-sponsored agencies $ 26,146,000 $ 294,000 $ — $ 26,440,000 Mortgage-backed securities 43,414,000 844,000 (119,000) 44,139,000 State and political subdivisions 245,152,000 8,660,000 (69,000) 253,743,000 Corporate securities 17,250,000 490,000 — 17,740,000 $ 331,962,000 $ 10,288,000 $ (188,000) $ 342,062,000 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 The following table summarizes the contractual maturities of investment securities at September 30, 2021: Securities available for sale Securities to be held to maturity Amortized Fair Value (Estimated) Amortized Fair Value (Estimated) Due in 1 year or less $ — $ — $ 3,788,000 $ 3,763,000 Due in 1 to 5 years 6,285,000 6,529,000 18,616,000 19,426,000 Due in 5 to 10 years 37,971,000 38,400,000 171,039,000 176,007,000 Due after 10 years 265,762,000 264,295,000 182,256,000 180,601,000 $ 310,018,000 $ 309,224,000 $ 375,699,000 $ 379,797,000 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 Fair Value (Estimated) Amortized 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 September 30, 2020: Securities available for sale Securities to be held to maturity Amortized Fair Value (Estimated) Amortized Fair Value (Estimated) Due in 1 year or less $ 7,097,000 $ 7,159,000 $ 2,454,000 $ 2,462,000 Due in 1 to 5 years 23,789,000 24,260,000 32,595,000 33,683,000 Due in 5 to 10 years 58,430,000 60,086,000 176,400,000 182,370,000 Due after 10 years 243,836,000 248,635,000 120,513,000 123,547,000 $ 333,152,000 $ 340,140,000 $ 331,962,000 $ 342,062,000 At September 30, 2021, securities with a fair value of $349,978,000 were pledged to secure public deposits, repurchase agreements, and for other purposes as required by law. This compares to securities with a fair value of $297,326,000 as of December 31, 2020 and $285,253,000 at September 30, 2020, pledged for the same purposes. Gains and losses on the sale of securities 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 the nine months and quarters ended September 30, 2021 and 2020: For the nine months ended September 30, For the quarter ended September 30, 2021 2020 2021 2020 Proceeds from sales of securities $ 19,435,000 $ 79,469,000 $ 3,743,000 $ — Gross realized gains 627,000 1,526,000 1,000 — Gross realized losses (605,000) (347,000) (143,000) — Net gain (loss) $ 22,000 $ 1,179,000 $ (142,000) $ — Related income taxes $ 5,000 $ 248,000 $ (29,000) $ — Prior year sales included 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 $8,332,000 resulting in a net realized gain of $268,000. The potential economic impact of COVID-19 was 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 September 30, 2021, there were 184 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 19 had been temporarily impaired for 12 months or more. The Company has the ability and intent to hold its impaired securities until a recovery of their amortized cost, which may be at maturity. Information regarding securities temporarily impaired as of September 30, 2021 is summarized below: Less than 12 months 12 months or more Total Fair Value (Estimated) Unrealized Losses Fair Value (Estimated) Unrealized Losses Fair Value (Estimated) Unrealized Losses U.S. Government-sponsored agencies $ 37,054,000 $ (1,396,000) $ 16,174,000 $ (871,000) $ 53,228,000 $ (2,267,000) Mortgage-backed securities 207,951,000 (4,207,000) 17,337,000 (598,000) 225,288,000 (4,805,000) State and political subdivisions 50,050,000 (1,348,000) — — 50,050,000 (1,348,000) Corporate securities 3,465,000 (35,000) — — 3,465,000 (35,000) $ 298,520,000 $ (6,986,000) $ 33,511,000 $ (1,469,000) $ 332,031,000 $ (8,455,000) 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. Information regarding securities temporarily impaired as of December 31, 2020 is summarized below: Less than 12 months 12 months or more Total Fair Value (Estimated) Unrealized Losses Fair Value (Estimated) Unrealized Losses Fair Value (Estimated) Unrealized 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 September 30, 2020, there were 75 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. Information regarding securities temporarily impaired as of September 30, 2020 is summarized below: Less than 12 months 12 months or more Total Fair Value (Estimated) Unrealized Losses Fair Value (Estimated) Unrealized Losses Fair Value (Estimated) Unrealized Losses U.S. Government-sponsored agencies $ 16,817,000 $ (228,000) $ — $ — $ 16,817,000 $ (228,000) Mortgage-backed securities 79,816,000 (654,000) 4,216,000 (114,000) 84,032,000 (768,000) State and political subdivisions 19,201,000 (361,000) — — 19,201,000 (361,000) $ 115,834,000 $ (1,243,000) $ 4,216,000 $ (114,000) $ 120,050,000 $ (1,357,000) During the third quarter of 2014, the Company transferred securities with a total amortized cost of $89,780,000 with 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 $99,000, net of taxes, at September 30, 2021. This compares to $133,000 and $139,000, net of taxes, at December 31, 2020 and September 30, 2020, respectively. 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 a portion of its wholesale funding needs. As of September 30, 2021 and 2020, and December 31, 2020, the Bank's investment in FHLB stock totaled $7,802,000, $9,508,000 and $9,508,000, respectively. FHLB stock is a non-marketable 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 September 30, 2021. The Company will continue to monitor its investment in FHLB stock.

Loans

Loans	9 Months Ended
	Sep. 30, 2021
Loans and Leases Receivable Disclosure [Abstract]
Loans	Loans The following table shows the composition of the Company's loan portfolio as of September 30, 2021 and 2020 and at December 31, 2020: September 30, 2021 December 31, 2020 September 30, 2020 Commercial Real estate $ 550,077,000 34.0 % $ 442,121,000 29.9 % $ 407,128,000 28.3 % Construction 73,302,000 4.6 % 56,565,000 3.8 % 52,038,000 3.6 % Other 288,121,000 17.8 % 285,015,000 19.3 % 309,297,000 21.5 % Municipal 40,616,000 2.5 % 43,783,000 3.0 % 44,110,000 3.1 % Residential Term 537,811,000 33.3 % 522,070,000 35.3 % 497,667,000 34.6 % Construction 29,358,000 1.8 % 21,600,000 1.5 % 16,101,000 1.2 % Home equity line of credit 74,594,000 4.6 % 79,750,000 5.4 % 82,982,000 5.8 % Consumer 23,333,000 1.4 % 25,857,000 1.8 % 27,323,000 1.9 % Total $ 1,617,212,000 100.0 % $ 1,476,761,000 100.0 % $ 1,436,646,000 100.0 % Loan balances include net deferred loan costs of $6,597,000 as of September 30, 2021, $6,931,000 as of December 31, 2020, and $5,323,000 as of September 30, 2020. Net deferred loan costs have increased from a year ago and decreased year-to-date largely due to unearned fees and deferred costs associated with US Small Business Administration ("SBA") Payroll Protection Program ("PPP") loans originated in 2020 and during the first and second quarters of 2021. Pursuant to collateral agreements, qualifying first mortgage loans and commercial real estate loans, which totaled $356,517,000 at September 30, 2021, were used to collateralize borrowings from the FHLB. This compares to qualifying loans which totaled $378,183,000 at December 31, 2020, and $379,387,000 at September 30, 2020. In addition, commercial, construction and home equity loans totaling $291,188,000 at September 30, 2021, $259,599,000 at December 31, 2020, and $271,905,000 at September 30, 2020, were used to collateralize a standby line of credit at the Federal Reserve Bank of Boston. 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 September 30, 2021, is presented in the following table: 30-59 Days 60-89 Days 90+ Days All Current Total 90+ Days Commercial Real estate $ 33,000 $ — $ 226,000 $ 259,000 $ 549,818,000 $ 550,077,000 $ 36,000 Construction 13,000 15,000 — 28,000 73,274,000 73,302,000 — Other 92,000 359,000 225,000 676,000 287,445,000 288,121,000 — Municipal — — — — 40,616,000 40,616,000 — Residential Term 549,000 918,000 986,000 2,453,000 535,358,000 537,811,000 190,000 Construction — — — — 29,358,000 29,358,000 — Home equity line of credit 251,000 25,000 131,000 407,000 74,187,000 74,594,000 — Consumer 90,000 202,000 3,000 295,000 23,038,000 23,333,000 3,000 Total $ 1,028,000 $ 1,519,000 $ 1,571,000 $ 4,118,000 $ 1,613,094,000 $ 1,617,212,000 $ 229,000 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 Troubled Debt Restructure ("TDR") designation, which was extended by the Coronavirus Preparedness and Response Supplemental Appropriations Act, 2020. The Company actively worked with borrowers impacted by the COVID-19 outbreak and as of September 30, 2021, a total of 1,051 loan modification requests for interest-only payments or deferred payments had been completed in conformance with the Interagency Statement or CARES Act, representing $287,922,000 in loan balances, or approximately 18.3% of the loan portfolio excluding PPP balances. 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 September 30, 2021, loans totaling $6,609,000, or 0.41% 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 156 26 % $ 35,130,000 15 % Charged Off 1 — % 66,000 — % Subsequent Modification 2 — % 1,014,000 — % Still in Original Modification 1 — % 125,000 — % Out of Modification 445 74 % 197,999,000 85 % Total 605 100 % $ 234,334,000 100 % Residential Real Estate Modifications Units Percentage Balance Percentage Paid Off 73 20 % $ 12,694,000 24 % Subsequent Modification 53 14 % 5,405,000 10 % Still in Original Modification 1 — % 22,000 — % Out of Modification 250 66 % 34,457,000 66 % Total 377 100 % $ 52,578,000 100 % Consumer Loan Modifications Units Percentage Balance Percentage Paid Off 23 34 % $ 209,000 21 % Charged Off 1 1 % 10,000 1 % Subsequent Modification 2 3 % 43,000 4 % Out of Modification 43 62 % 748,000 74 % Total 69 100 % $ 1,010,000 100 % 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 September 30, 2020, is presented in the following table: 30-59 Days 60-89 Days 90+ Days All Current Total 90+ Days Commercial Real estate $ 2,397,000 $ 58,000 $ 454,000 $ 2,909,000 $ 404,219,000 $ 407,128,000 $ — Construction — — 80,000 80,000 51,958,000 52,038,000 — Other 547,000 258,000 1,871,000 2,676,000 306,621,000 309,297,000 1,464,000 Municipal — — — — 44,110,000 44,110,000 — Residential Term 2,550,000 357,000 1,602,000 4,509,000 493,158,000 497,667,000 — Construction — — — — 16,101,000 16,101,000 — Home equity line of credit 868,000 65,000 1,392,000 2,325,000 80,657,000 82,982,000 — Consumer 219,000 28,000 30,000 277,000 27,046,000 27,323,000 30,000 Total $ 6,581,000 $ 766,000 $ 5,429,000 $ 12,776,000 $ 1,423,870,000 $ 1,436,646,000 $ 1,494,000 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 September 30, 2021 and 2020 and at December 31, 2020 is presented in the following table: September 30, 2021 December 31, 2020 September 30, 2020 Commercial Real estate $ 604,000 $ 543,000 $ 1,771,000 Construction 23,000 89,000 307,000 Other 1,251,000 1,481,000 503,000 Municipal — — — Residential Term 3,785,000 3,593,000 4,467,000 Construction — — — Home equity line of credit 482,000 1,015,000 2,063,000 Consumer — — — Total $ 6,145,000 $ 6,721,000 $ 9,111,000 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 and for the period ended September 30, 2021 is presented in the following table: For the nine months ended September 30, 2021 For the quarter ended September 30, 2021 Recorded Investment Unpaid Principal Balance Related Allowance Average Recorded Investment Recognized Interest Income Average Recorded Investment Recognized Interest Income With No Related Allowance Commercial Real estate $ 1,906,000 $ 2,257,000 $ — $ 2,215,000 $ 50,000 $ 2,053,000 $ 15,000 Construction 24,000 25,000 — 69,000 — 24,000 — Other 1,353,000 1,459,000 — 1,534,000 12,000 1,372,000 4,000 Municipal — — — — — — — Residential Term 7,021,000 8,181,000 — 7,231,000 101,000 7,180,000 33,000 Construction — — — 9,000 — — — Home equity line of credit 482,000 516,000 — 725,000 — 546,000 — Consumer 4,000 4,000 — 6,000 — 4,000 — $ 10,790,000 $ 12,442,000 $ — $ 11,789,000 $ 163,000 $ 11,179,000 $ 52,000 With an Allowance Recorded Commercial Real estate $ 894,000 $ 923,000 $ 138,000 $ 940,000 $ 30,000 $ 910,000 $ 10,000 Construction 681,000 681,000 18,000 681,000 17,000 681,000 6,000 Other 402,000 421,000 397,000 466,000 10,000 403,000 5,000 Municipal — — — — — — — Residential Term 1,761,000 1,923,000 129,000 1,753,000 32,000 1,641,000 9,000 Construction — — — — — — — Home equity line of credit 21,000 21,000 — 15,000 — 21,000 — Consumer — — — 1,000 — 3,000 — $ 3,759,000 $ 3,969,000 $ 682,000 $ 3,856,000 $ 89,000 $ 3,659,000 $ 30,000 Total Commercial Real estate $ 2,800,000 $ 3,180,000 $ 138,000 $ 3,155,000 $ 80,000 $ 2,963,000 $ 25,000 Construction 705,000 706,000 18,000 750,000 17,000 705,000 6,000 Other 1,755,000 1,880,000 397,000 2,000,000 22,000 1,775,000 9,000 Municipal — — — — — — — Residential Term 8,782,000 10,104,000 129,000 8,984,000 133,000 8,821,000 42,000 Construction — — — 9,000 — — — Home equity line of credit 503,000 537,000 — 740,000 — 567,000 — Consumer 4,000 4,000 — 7,000 — 7,000 — $ 14,549,000 $ 16,411,000 $ 682,000 $ 15,645,000 $ 252,000 $ 14,838,000 $ 82,000 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 and for the year ended December 31, 2020 is presented in the following table: Recorded Investment Unpaid Principal Balance Related Allowance Average Recorded Investment Recognized Interest Income With No Related Allowance Commercial Real estate $ 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 A breakdown of impaired loans by class of financing receivable as of and for the period ended September 30, 2020 is presented in the following table: For the nine months ended September 30, 2020 For the quarter ended September 30, 2020 Recorded Investment Unpaid Principal Balance Related Allowance Average Recorded Investment Recognized Interest Income Average Recorded Investment Recognized Interest Income With No Related Allowance Commercial Real estate $ 3,730,000 $ 4,528,000 $ — $ 4,673,000 $ 117,000 $ 4,068,000 $ 33,000 Construction 308,000 337,000 — 402,000 — 256,000 — Other 862,000 887,000 — 796,000 19,000 814,000 6,000 Municipal — — — — — — — Residential Term 7,783,000 9,058,000 — 9,173,000 123,000 8,024,000 31,000 Construction — — — — — — — Home equity line of credit 1,478,000 1,551,000 — 1,284,000 10,000 1,438,000 2,000 Consumer — — — — — — — $ 14,161,000 $ 16,361,000 $ — $ 16,328,000 $ 269,000 $ 14,600,000 $ 72,000 With an Allowance Recorded Commercial Real estate $ 1,023,000 $ 1,047,000 $ 135,000 $ 1,032,000 $ 32,000 $ 1,027,000 $ 11,000 Construction 701,000 701,000 19,000 546,000 25,000 701,000 8,000 Other 161,000 183,000 128,000 1,523,000 — 143,000 — Municipal — — — — — — — Residential Term 2,399,000 2,466,000 204,000 2,002,000 63,000 2,207,000 27,000 Construction — — — — — — — Home equity line of credit 886,000 886,000 403,000 981,000 1,000 870,000 1,000 Consumer 10,000 10,000 1,000 10,000 — 3,000 — $ 5,180,000 $ 5,293,000 $ 890,000 $ 6,094,000 $ 121,000 $ 4,951,000 $ 47,000 Total Commercial Real estate $ 4,753,000 $ 5,575,000 $ 135,000 $ 5,705,000 $ 149,000 $ 5,095,000 $ 44,000 Construction 1,009,000 1,038,000 19,000 948,000 25,000 957,000 8,000 Other 1,023,000 1,070,000 128,000 2,319,000 19,000 957,000 6,000 Municipal — — — — — — — Residential Term 10,182,000 11,524,000 204,000 11,175,000 186,000 10,231,000 58,000 Construction — — — — — — — Home equity line of credit 2,364,000 2,437,000 403,000 2,265,000 11,000 2,308,000 3,000 Consumer 10,000 10,000 1,000 10,000 — 3,000 — $ 19,341,000 $ 21,654,000 $ 890,000 $ 22,422,000 $ 390,000 $ 19,551,000 $ 119,000 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 September 30, 2021, the Company had 64 loans with a balance of $10,051,000 that have been classified as TDRs. This compares to 74 loans with a balance of $11,534,000 and 78 loans with a balance of $13,390,000 classified as TDRs as of December 31, 2020 and September 30, 2020, respectively. The impairment carried as a specific reserve in the allowance for loan losses is calculated by present valuing the expected cash flows on the loan at the original interest rate, 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 September 30, 2021: Number of Loans Balance Specific Reserves Commercial Real estate 10 $ 2,238,000 $ 138,000 Construction 1 681,000 18,000 Other 6 883,000 351,000 Municipal — — — Residential Term 45 6,224,000 129,000 Construction — — — Home equity line of credit 1 21,000 — Consumer 1 4,000 — 64 $ 10,051,000 $ 636,000 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 September 30, 2020: Number of Loans Balance Specific Reserves Commercial Real estate 16 $ 4,054,000 $ 130,000 Construction 1 701,000 19,000 Other 6 729,000 92,000 Municipal — — — Residential Term 51 7,430,000 153,000 Construction — — — Home equity line of credit 3 466,000 — Consumer 1 10,000 1,000 78 $ 13,390,000 $ 395,000 As of September 30, 2021, 12 of the loans classified as TDRs with a total balance of $1,095,000 were more than 30 days past due. Of these loans, two had been placed on TDR status in the previous 12 months. The following table shows these TDRs by class and the associated specific reserves included in the allowance for loan losses as of September 30, 2021: Number of Loans Balance Specific Reserves Commercial Real estate — $ — $ — Construction — — — Other 5 641,000 351,000 Municipal — — — Residential Term 6 450,000 — Construction — — — Home equity line of credit — — — Consumer 1 4,000 — 12 $ 1,095,000 $ 351,000 As of September 30, 2020, 15 of the loans classified as TDRs with a total balance of $2,814,000 were more than 30 days past due. Of these loans, two had been placed on TDR status in the previous 12 months. The following table shows these TDRs by class and the associated specific reserves included in the allowance for loan losses as of September 30, 2020: Number of Loans Balance Specific Reserves Commercial Real estate 3 $ 1,472,000 $ — Construction — — Other 4 424,000 92,000 Municipal — — Residential Term 6 743,000 — Construction — — — Home equity line of credit 1 165,000 — Consumer 1 10,000 1,000 15 $ 2,814,000 $ 93,000 For the nine months ended September 30, 2021, 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 September 30, 2021: Number of Loans Pre-Modification Post-Modification Outstanding Specific Reserves Commercial Real estate — $ — $ — $ — Construction 1 80,000 80,000 — Other 1 261,000 261,000 261,000 Municipal — — — — Residential Term 1 9,000 4,000 — Construction — — — — Home equity line of credit — — — — Consumer — — — — 3 $ 350,000 $ 345,000 $ 261,000 For the nine months ended September 30, 2020, three loans were placed on TDR status. The following table shows these TDRs by class and associated specific reserves included in the allowance for loan losses as of September 30, 2020: Number of Loans Pre-Modification Post-Modification Outstanding Specific Reserves Commercial Real estate — $ — $ — $ — Construction — — — — Other — — — — Municipal — — — — Residential Term 2 235,000 187,000 23,000 Construction — — — — Home equity line of credit — — — — Consumer 1 10,000 10,000 1,000 3 $ 245,000 $ 197,000 $ 24,000 For the quarter ended September 30, 2021, no loans were placed on TDR status. For the quarter ended September 30, 2020, one loan was placed on TDR status. The following table shows this TDR by class and the associated specific reserve included in the allowance for loan losses as of September 30, 2020: Number of Loans Pre-Modification Outstanding Recorded Investment Post-Modification Outstanding Recorded Investment Specific Reserves Commercial Real estate — $ — $ — $ — Construction — — — — Other — — — — Municipal — — — — Residential Term — — — — Construction — — — — Home equity line of credit — — — Consumer 1 10,000 10,000 1,000 1 $ 10,000 $ 10,000 $ 1,000 As of September 30, 2021, Management is aware of eight loans classified as TDRs that are involved in bankruptcy with an outstanding balance of $961,000. There were also 19 loans with an outstanding balance of $1,648,000 that were classified as TDRs and on non-accrual status, of which no loans were in the process of foreclosure. Residential Mortgage Loans in Process of Foreclosure As of September 30, 2021, there were 10 mortgage loans collateralized by residential real estate in the process of foreclosure with a total balance of $839,000. This compares to 17 mortgage loans collateralized by residential real estate in the process of foreclosure with a total balance of $2,083,000 as of September 30, 2020.

Allowance for Loan Losses

Allowance for Loan Losses	9 Months Ended
	Sep. 30, 2021
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. The loan portfolio is classified in eight classes and credit risk is evaluated separately in each class. 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 - 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 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 September 30, 2021, December 31, 2020, and September 30, 2020, by class of financing receivable and allowance element, is presented in the following tables: As of September 30, 2021 Specific Reserves on Loans Evaluated Individually for Impairment General Reserves on Loans Based on Historical Loss Experience Reserves for Qualitative Factors Unallocated Total Reserves Commercial Real estate $ 138,000 $ 864,000 $ 5,497,000 $ — $ 6,499,000 Construction 18,000 117,000 744,000 — 879,000 Other 397,000 452,000 2,878,000 — 3,727,000 Municipal — — 189,000 — 189,000 Residential Term 129,000 189,000 2,443,000 — 2,761,000 Construction — 10,000 132,000 — 142,000 Home equity line of credit — 109,000 847,000 — 956,000 Consumer — 263,000 604,000 — 867,000 Unallocated — — — 1,487,000 1,487,000 $ 682,000 $ 2,004,000 $ 13,334,000 $ 1,487,000 $ 17,507,000 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 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 September 30, 2020 Specific Reserves on Loans Evaluated Individually for Impairment General Reserves on Loans Based on Historical Loss Experience Reserves for Qualitative Factors Unallocated Total Reserves Commercial Real estate $ 135,000 $ 686,000 $ 3,940,000 $ — $ 4,761,000 Construction 19,000 87,000 501,000 — 607,000 Other 128,000 521,000 2,993,000 — 3,642,000 Municipal — — 139,000 — 139,000 Residential Term 204,000 275,000 2,037,000 — 2,516,000 Construction — 10,000 71,000 — 81,000 Home equity line of credit 403,000 79,000 975,000 — 1,457,000 Consumer 1,000 168,000 423,000 — 592,000 Unallocated — — — 1,576,000 1,576,000 $ 890,000 $ 1,826,000 $ 11,079,000 $ 1,576,000 $ 15,371,000 Qualitative adjustment factors are taken into consideration when determining reserve estimates. These adjustment factors are based upon Management's 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 the loan origination; 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 0.82% of related loans as of September 30, 2021, compared to 0.80% of related loans as of December 31, 2020. The qualitative portion increased $1,539,000 between December 31, 2020 and September 30, 2021 due to a mix of factors. These factors included changes in various macroeconomic measures used in the qualitative model, updated analysis of the loan portfolio in multiple stress scenarios, and performance of COVID-19 related loan modifications. The unallocated component of the allowance totaled $1,487,000 at September 30, 2021, or 8.5% of the total reserve. This compares to $2,134,000 or 13.1% as of December 31, 2020. Maintenance of an unallocated component reflects general imprecision related to portfolio growth along with lingering uncertainty regarding the potential impacts of COVID-19 on the loan portfolio. The allowance for loan losses as a percent of total loans stood at 1.08% as of September 30, 2021, 1.10% at December 31, 2020 and 1.07% as of September 30, 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 Company 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 and 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. 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. Municipal loans are considered either general obligations of the issuer backed by the taxing ability of the municipality for repayment of debt, or revenue obligations backed by a pledge of the issuer's revenue, such as water & sewer usage fees. Residential loans are comprised of two classes: term loans and construction loans. Residential term loans consist of residential real estate loans held in the Company's loan portfolio made to borrowers who demonstrate the ability to make scheduled payments with full consideration to 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 construction 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 Company 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 is 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 45.4% of Bank capital are below the regulatory guidance limit of 100.0% of capital at September 30, 2021. Construction loans and non-owner-occupied commercial real estate loans are at 191.7% of Bank total capital, below the regulatory limit of 300.0% of capital at September 30, 2021. The process of establishing the allowance with respect to the commercial loan portfolio begins when a Loan Officer or Senior Officer (or designee) initially assigns each loan a risk rating, using established credit criteria. Approximately 60% of commercial loan outstanding balances, excluding SBA PPP loans, are subject to review and validation annually by an independent consulting firm. Additionally, commercial loan relationships with exposure greater than or equal to $500,000 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 and 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 protected 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 Company's credit position at some future date. 7 Substandard Loans in this category are inadequately protected by the paying capacity of the borrower or of the collateral pledged, if any. Loans so classified have a well-defined weakness or weaknesses that jeopardize the liquidation of the debt. Substandard loans are characterized by the distinct possibility that the Company may sustain some loss if the 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 real estate, commercial construction, commercial other, and municipal loans as of September 30, 2021: Commercial Commercial Commercial Municipal All Risk- 1 Strong $ — $ — $ 2,434,000 $ 8,000 $ 2,442,000 2 Above Average 9,220,000 175,000 7,144,000 38,787,000 55,326,000 3 Satisfactory 92,596,000 1,831,000 79,693,000 354,000 174,474,000 4 Average 355,252,000 47,003,000 155,189,000 1,467,000 558,911,000 5 Watch 79,885,000 24,293,000 38,505,000 — 142,683,000 6 OAEM 3,899,000 — 32,000 — 3,931,000 7 Substandard 9,225,000 — 5,124,000 — 14,349,000 8 Doubtful — — — — — Total $ 550,077,000 $ 73,302,000 $ 288,121,000 $ 40,616,000 $ 952,116,000 The following table summarizes the risk ratings for the Company's commercial real estate, commercial construction, 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 real estate, commercial construction, commercial other, and municipal loans as of September 30, 2020: Commercial Commercial Commercial Municipal All Risk- 1 Strong $ — $ — $ 2,251,000 $ 23,000 $ 2,274,000 2 Above Average 8,492,000 1,627,000 5,361,000 42,262,000 57,742,000 3 Satisfactory 84,178,000 3,145,000 140,360,000 369,000 228,052,000 4 Average 230,954,000 27,907,000 107,552,000 1,456,000 367,869,000 5 Watch 68,565,000 18,919,000 46,211,000 — 133,695,000 6 OAEM 2,028,000 — 1,291,000 — 3,319,000 7 Substandard 12,911,000 440,000 6,271,000 — 19,622,000 8 Doubtful — — — — — Total $ 407,128,000 $ 52,038,000 $ 309,297,000 $ 44,110,000 $ 812,573,000 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 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 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 nine months ended September 30, 2021. The following table presents allowance for loan losses activity by class for the nine months and quarter ended September 30, 2021, and allowance for loan loss balances by class and related loan balances by class as of September 30, 2021: Commercial Municipal Residential Home Equity Line of Credit Consumer Unallocated Total Real Estate Construction Other Term Construction For the nine months ended September 30, 2021 Beginning 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 Charge offs 71,000 — 286,000 — 41,000 — — 239,000 — 637,000 Recoveries 95,000 — 83,000 — 12,000 — 60,000 66,000 — 316,000 Provision (credit) 1,297,000 217,000 492,000 18,000 211,000 40,000 (315,000) 262,000 (647,000) 1,575,000 Ending balance $ 6,499,000 $ 879,000 $ 3,727,000 $ 189,000 $ 2,761,000 $ 142,000 $ 956,000 $ 867,000 $ 1,487,000 $ 17,507,000 For the three months ended September 30, 2021 Beginning balance $ 6,088,000 $ 750,000 $ 3,757,000 $ 187,000 $ 2,896,000 $ 160,000 $ 959,000 $ 892,000 $ 1,345,000 $ 17,034,000 Charge offs 66,000 — — — — — — 92,000 — 158,000 Recoveries — — 81,000 — 3,000 — 12,000 10,000 — 106,000 Provision (credit) 477,000 129,000 (111,000) 2,000 (138,000) (18,000) (15,000) 57,000 142,000 525,000 Ending balance $ 6,499,000 $ 879,000 $ 3,727,000 $ 189,000 $ 2,761,000 $ 142,000 $ 956,000 $ 867,000 $ 1,487,000 $ 17,507,000 Allowance for loan losses as of September 30, 2021 Ending balance specifically evaluated for impairment $ 138,000 $ 18,000 $ 397,000 $ — $ 129,000 $ — $ — $ — $ — $ 682,000 Ending balance collectively evaluated for impairment $ 6,361,000 $ 861,000 $ 3,330,000 $ 189,000 $ 2,632,000 $ 142,000 $ 956,000 $ 867,000 $ 1,487,000 $ 16,825,000 Related loan balances as of September 30, 2021 Ending balance $ 550,077,000 $ 73,302,000 $ 288,121,000 $ 40,616,000 $ 537,811,000 $ 29,358,000 $ 74,594,000 $ 23,333,000 $ — $ 1,617,212,000 Ending balance specifically evaluated for impairment $ 2,800,000 $ 705,000 $ 1,755,000 $ — $ 8,782,000 $ — $ 503,000 $ 4,000 $ — $ 14,549,000 Ending balance collectively evaluated for impairment $ 547,277,000 $ 72,597,000 $ 286,366,000 $ 40,616,000 $ 529,029,000 $ 29,358,000 $ 74,091,000 $ 23,329,000 $ — $ 1,602,663,000 The following table presents allowance for loan losses activity by class for the year ended December 31, 2020 and allowance for loan loss balances by class and related loan balances by class as of December 31, 2020: Commercial Municipal Residential Home Equity Line of Credit Consumer Unallocated Total Real Estate Construction Other Term Construction For the year ended December 31, 2020 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 Charge offs 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 Allowance for loan losses as of December 31, 2020 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 as of December 31, 2020 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 The following table presents allowance for loan losses activity by class for the nine months and quarter ended September 30, 2020, and allowance for loan loss balances by class and related loan balances by class as of September 30, 2020: Commercial Municipal Residential Home Equity Line of Credit Consumer Unallocated Total Real Estate Construction Other Term Construction For the nine months ended September 30, 2020 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 Charge offs 532,000 — 24,000 — 46,000 — 153,000 238,000 — 993,000 Recoveries — — 24,000 — 31,000 — 20,000 100,000 — 175,000 Provision (credit) 1,551,000 242,000 313,000 112,000 1,507,000 56,000 512,000 (137,000) 394,000 4,550,000 Ending balance $ 4,761,000 $ 607,000 $ 3,642,000 $ 139,000 $ 2,516,000 $ 81,000 $ 1,457,000 $ 592,000 $ 1,576,000 $ 15,371,000 For the three months ended September 30, 2020 Beginning balance $ 4,511,000 $ 524,000 $ 3,689,000 $ 110,000 $ 2,261,000 $ 64,000 $ 1,284,000 $ 658,000 $ 1,009,000 $ 14,110,000 Charge offs 532,000 — 7,000 — — — — 37,000 — 576,000 Recoveries — — 4,000 — 5,000 — 1,000 27,000 — 37,000 Provision (credit) 782,000 83,000 (44,000) 29,000 250,000 17,000 172,000 (56,000) 567,000 1,800,000 Ending balance $ 4,761,000 $ 607,000 $ 3,642,000 $ 139,000 $ 2,516,000 $ 81,000 $ 1,457,000 $ 592,000 $ 1,576,000 $ 15,371,000 Allowance for loan losses as of September 30, 2020 Ending balance specifically evaluated for impairment $ 135,000 $ 19,000 $ 128,000 $ — $ 204,000 $ — $ 403,000 $ 1,000 $ — $ 890,000 Ending balance collectively evaluated for impairment $ 4,626,000 $ 588,000 $ 3,514,000 $ 139,000 $ 2,312,000 $ 81,000 $ 1,054,000 $ 591,000 $ 1,576,000 $ 14,481,000 Related loan balances as of September 30, 2020 Ending balance $ 407,128,000 $ 52,038,000 $ 309,297,000 $ 44,110,000 $ 497,667,000 $ 16,101,000 $ 82,982,000 $ 27,323,000 $ — $ 1,436,646,000 Ending balance specifically evaluated for impairment $ 4,753,000 $ 1,009,000 $ 1,023,000 $ — $ 10,182,000 $ — $ 2,364,000 $ 10,000 $ — $ 19,341,000 Ending balance collectively evaluated for impairment $ 402,375,000 $ 51,029,000 $ 308,274,000 $ 44,110,000 $ 487,485,000 $ 16,101,000 $ 80,618,000 $ 27,313,000 $ — $ 1,417,305,000

Stock-Based Compensation

Stock-Based Compensation	9 Months Ended
	Sep. 30, 2021
Share-based Payment Arrangement [Abstract]
Stock-Based Compensation	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"). The 2020 Plan reserves 400,000 shares of common stock for issuance in connection with stock options, restricted stock awards, and other equity based awards to attract and retain the best available personnel, provide additional incentive to officers, employees, and non-employee Directors, and promote the success of 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 qualifies as performance-based for purposes of Section 162(m) of the Internal Revenue Code, and satisfies NASDAQ guidelines relating to equity compensation. As of September 30, 2021, 184,487 shares of restricted stock had been granted under the 2010 Plan and 40,189 shares under the 2020 Plan, of which 81,240 shares remain restricted as of September 30, 2021 as detailed in the following table: Year Vesting Term Shares Remaining Term 2017 5.0 5,774 0.3 2018 4.0 706 0.3 2018 5.0 6,184 1.3 2019 3.0 16,254 0.3 2020 2.0 694 0.3 2020 3.0 20,342 1.3 2021 1.0 4,114 0.3 2021 3.0 27,172 2.3 81,240 1.3 The compensation cost related to these non-vested restricted stock grants is $2,135,000 and is recognized over the vesting terms of each grant. In the nine months ended September 30, 2021, $672,000 of expense was recognized for these restricted shares, leaving $855,000 in unrecognized expense as of September 30, 2021. In the nine months ended September 30, 2020, $482,000 of expense was recognized for restricted shares, leaving $864,000 in unrecognized expense as of September 30, 2020.

Common Stock

Common Stock	9 Months Ended
	Sep. 30, 2021
Stockholders' Equity Note [Abstract]
Common Stock	Common StockProceeds from sale of common stock totaled $514,000 and $497,000 for the nine months ended September 30, 2021 and 2020, respectively.

Earnings Per Share

Earnings Per Share	9 Months Ended
	Sep. 30, 2021
Earnings Per Share [Abstract]
Earnings Per Share	Earnings Per Share The following table sets forth the computation of basic and diluted earnings per share (EPS) for the nine months ended September 30, 2021 and 2020: Income (Numerator) Shares (Denominator) Per-Share Amount For the nine months ended September 30, 2021 Net income as reported $ 26,723,000 Basic EPS: Income available to common shareholders 26,723,000 10,901,793 $ 2.45 Effect of dilutive securities: restricted stock 82,157 Diluted EPS: Income available to common shareholders plus assumed conversions $ 26,723,000 10,983,950 $ 2.43 For the nine months ended September 30, 2020 Net income as reported $ 20,159,000 Basic EPS: Income available to common shareholders 20,159,000 10,854,384 $ 1.86 Effect of dilutive securities: restricted stock 73,285 Diluted EPS: Income available to common shareholders plus assumed conversions $ 20,159,000 10,927,669 $ 1.84 The following table sets forth the computation of basic and diluted earnings per share (EPS) for the quarters ended September 30, 2021 and 2020: Income (Numerator) Shares (Denominator) Per-Share Amount For the quarter ended September 30, 2021 Net income as reported $ 9,014,000 Basic EPS: Income available to common shareholders 9,014,000 10,909,338 $ 0.83 Effect of dilutive securities: restricted stock 81,811 Diluted EPS: Income available to common shareholders plus assumed conversions $ 9,014,000 10,991,149 $ 0.82 For the quarter ended September 30, 2020 Net income as reported $ 7,095,000 Basic EPS: Income available to common shareholders 7,095,000 10,863,315 $ 0.65 Effect of dilutive securities: restricted stock 76,544 Diluted EPS: Income available to common shareholders plus assumed conversions $ 7,095,000 10,939,859 $ 0.65

Employee Benefit Plans

Employee Benefit Plans	9 Months Ended
	Sep. 30, 2021
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 ("IRS") determined limits and the Bank may match 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. The Company adopted the safe harbor form of 401(k) plan in 2020 and follows safe harbor guidelines when determining the level of discretionary contribution. The expense related to the 401(k) plan was $593,000 and $653,000 for the nine months ended September 30, 2021 and 2020, respectively. Deferred Compensation and Supplemental Retirement Benefits The Bank also provides unfunded supplemental retirement benefits for certain officers, payable in installments over 20 years upon retirement or death. The agreements consist of individual contracts with differing characteristics that, when taken together, do not constitute a postretirement plan. The costs for these benefits are recognized over the service periods of the participating officers in accordance with Financial Accounting Standards Board ("FASB") ASC Topic 712 "Compensation – Nonretirement Postemployment Benefits". The expense of these supplemental retirement benefits was $126,000 and $119,000 for the nine months ended September 30, 2021 and 2020, respectively. As of September 30, 2021, the associated accrued liability included in other liabilities in the balance sheet was $2,902,000 compared to $2,991,000 and $2,708,000 at December 31, 2020 and September 30, 2020, respectively. Postretirement Benefit Plans The Bank sponsors two postretirement benefit plans. One plan currently provides a subsidy for health insurance premiums to certain retired employees; these subsidies are based on years of service and range between $40 and $1,200 per month per person. The other plan provides life insurance coverage to certain retired employees and health insurance for retired directors. None of these plans are prefunded. The Company utilizes FASB ASC Topic 712 to recognize the overfunded or underfunded status of a defined benefit postretirement 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 postretirement benefit obligation and funded status: At or for the nine months ended September 30, 2021 2020 Change in benefit obligation Benefit obligation at beginning of year $ 1,523,000 $ 1,581,000 Interest cost 21,000 48,000 Benefits paid (72,000) (81,000) Benefit obligation at end of period $ 1,472,000 $ 1,548,000 Funded status Benefit obligation at end of period $ (1,472,000) $ (1,548,000) Unamortized gain (35,000) (31,000) Accrued benefit cost at end of period $ (1,507,000) $ (1,579,000) The following table sets forth the net periodic pension cost: For the nine months ended September 30, For the quarter ended September 30, 2021 2020 2021 2020 Components of net periodic benefit cost Interest cost $ 21,000 $ 48,000 $ 6,000 $ 16,000 Net periodic benefit cost $ 21,000 $ 48,000 $ 6,000 $ 16,000 Amounts not yet reflected in net periodic benefit cost and included in accumulated other comprehensive income are as follows: September 30, December 31, 2020 September 30, Unamortized net actuarial gain $ 35,000 $ 35,000 $ 31,000 Deferred tax expense (7,000) (7,000) (7,000) Net unrecognized postretirement benefits included in accumulated other comprehensive income $ 28,000 $ 28,000 $ 24,000 A weighted average discount rate of 2.00% was used in determining the accumulated benefit obligation and the net periodic benefit cost. The assumed health care cost trend rate is 7.00%. The measurement date for benefit obligations was as of year-end for prior years presented. The expected benefit payments for all of 2021 are $97,000. Plan expense for 2021 is estimated to be $30,000. A 1.00% change in trend assumptions would create an approximate change in the same direction of $100,000 in the accumulated benefit obligation, $7,000 in the interest cost, and $1,000 in the service cost.

Other Comprehensive Income (Los

Other Comprehensive Income (Loss)	9 Months Ended
	Sep. 30, 2021
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 nine months and quarter ended September 30, 2021 and 2020. For the nine months ended September 30, For the quarter ended September 30, 2021 2020 2021 2020 Balance at beginning of period $ 5,009,000 $ 3,657,000 $ 1,190,000 $ 7,100,000 Unrealized gains (losses) arising during the period (7,112,000) 3,537,000 (2,442,000) (2,000,000) Reclassification of net realized (gains) losses during the period (22,000) (1,179,000) 142,000 — Related deferred taxes 1,498,000 (495,000) 483,000 420,000 Net change (5,636,000) 1,863,000 (1,817,000) (1,580,000) Balance at end of period $ (627,000) $ 5,520,000 $ (627,000) $ 5,520,000 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 nine months and quarter ended September 30, 2021 and 2020. For the nine months ended September 30, For the quarter ended September 30, 2021 2020 2021 2020 Balance at beginning of period $ (133,000) $ (182,000) $ (113,000) $ (146,000) Amortization of net unrealized gains 43,000 54,000 18,000 9,000 Related deferred taxes (9,000) (11,000) (4,000) (2,000) Net change 34,000 43,000 14,000 7,000 Balance at end of period $ (99,000) $ (139,000) $ (99,000) $ (139,000) The following table presents the effect of the Company's derivative financial instruments included in other comprehensive income (loss) for the nine months and quarter ended September 30, 2021 and 2020. For the nine months ended September 30, For the quarter ended September 30, 2021 2020 2021 2020 Balance at beginning of period $ (4,932,000) $ 97,000 $ (2,083,000) $ (6,187,000) Unrealized gains (losses) on cash flow hedging derivatives arising during the period 4,297,000 (7,465,000) 691,000 490,000 Related deferred taxes (902,000) 1,568,000 (145,000) (103,000) Net change 3,395,000 (5,897,000) 546,000 387,000 Balance at end of period $ (1,537,000) $ (5,800,000) $ (1,537,000) $ (5,800,000) There was no activity in the unrealized gain or loss on postretirement benefits included in other comprehensive income (loss) for the nine months and quarter ended September 30, 2021 and 2020.

Financial Derivative Instrument

Financial Derivative Instruments	9 Months Ended
	Sep. 30, 2021
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Financial Derivative Instruments	Financial Derivative Instruments The Bank uses derivative financial instruments for risk management purposes and not for trading or speculative purposes. As part of its overall asset and liability management strategy, the Bank periodically uses derivative instruments to minimize significant unplanned fluctuations in earnings and cash flows caused by interest rate volatility. The Bank’s interest rate risk management strategy involves modifying the re-pricing characteristics of certain assets or liabilities so that changes in interest rates do not have a significant effect on net interest income. The Bank recognizes its derivative instruments in the consolidated balance sheet at fair value. On the date the derivative instrument is entered into, the Bank designates whether the derivative is part of a hedging relationship (i.e., cash flow or fair value hedge). The Bank formally documents relationships between hedging instruments and hedged items, as well as its risk management objective and strategy for undertaking hedge transactions. The Bank also assesses, both at the hedge’s inception and on an ongoing basis, whether the derivatives used in hedging transactions are highly effective in offsetting the changes in cash flows or fair values of hedged items. Changes in fair value of derivative instruments that are highly effective and qualify as cash flow hedges are recorded in other comprehensive income or (loss). Any ineffective portion is recorded in earnings. The Bank discontinues hedge accounting when it is determined that the derivative is no longer highly effective in offsetting changes of the hedged risk on the hedged item, or management determines that the designation of the derivative as a hedging instrument is no longer appropriate. The details of the interest rate swap agreements are as follows: September 30, 2021 December 31, 2020 September 30, 2020 Effective Date Maturity Date Variable Index Received Fixed Rate Paid Presentation on Consolidated Balance Sheet Notional Amount Fair Value Notional Amount Fair Value Notional Amount Fair Value 06/28/2016 06/28/2021 1-Month USD Libor 0.940% Other Liabilities $ — $ — $ 30,000,000 $ (121,000) $ 30,000,000 $ (179,000) 06/27/2016 06/27/2021 1-Month USD Libor 0.893% Other Liabilities — — 20,000,000 (76,000) 20,000,000 (112,000) 08/02/2019 08/02/2024 1-Month USD Libor 1.590% Other Liabilities 12,500,000 (381,000) 12,500,000 (626,000) 12,500,000 (692,000) 08/05/2019 08/05/2024 1-Month USD Libor 1.420% Other Liabilities 12,500,000 (320,000) 12,500,000 (550,000) 12,500,000 (611,000) 02/12/2020 02/12/2023 3-Month USD Libor 1.486% Other Liabilities 25,000,000 (438,000) 25,000,000 (695,000) 25,000,000 (762,000) 02/12/2020 02/12/2024 3-Month USD Libor 1.477% Other Liabilities 25,000,000 (601,000) 25,000,000 (972,000) 25,000,000 (1,044,000) 06/28/2021 06/28/2026 1-Month USD Libor 1.158% Other Liabilities 50,000,000 (594,000) 50,000,000 (1,872,000) 50,000,000 (2,162,000) 03/13/2020 03/13/2025 3-Month USD Libor 0.855% Other Liabilities 25,000,000 (85,000) 25,000,000 (551,000) 25,000,000 (621,000) 03/13/2020 03/13/2030 3-Month USD Libor 1.029% Other (Liabilities) Assets 20,000,000 644,000 20,000,000 (339,000) 20,000,000 (690,000) 04/07/2020 04/07/2023 3-Month USD Libor 0.599% Other Liabilities 20,000,000 (106,000) 20,000,000 (185,000) 20,000,000 (194,000) 04/07/2020 04/07/2024 3-Month USD Libor 0.643% Other Liabilities 20,000,000 (64,000) 20,000,000 (255,000) 20,000,000 (275,000) $210,000,000 $(1,945,000) $260,000,000 $(6,242,000) $260,000,000 $(7,342,000) 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 $1.76 million 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 September 30, 2021, there were six customer loan swap arrangements in place, detailed below: September 30, 2021 December 31, 2020 September 30, 2020 Presentation on Consolidated Balance Sheet Number of Positions Notional Amount Fair Value Number of Positions Notional Amount Fair Value Number of Positions Notional Amount Fair Value Pay Fixed, Receive Variable Other Assets 3 $ 15,885,000 $ 801,000 3 $ 16,922,000 $ 37,000 — $ — $ — Pay Fixed, Receive Variable Other Liabilities 3 24,768,000 (1,862,000) 2 16,065,000 (2,603,000) 4 28,541,000 (3,311,000) 6 40,653,000 (1,061,000) 5 32,987,000 (2,566,000) 4 28,541,000 (3,311,000) Receive Fixed, Pay Variable Other Assets 3 24,768,000 1,862,000 2 16,065,000 2,603,000 4 28,541,000 3,311,000 Receive Fixed, Pay Variable Other Liabilities 3 15,885,000 (801,000) 3 16,922,000 (37,000) — — — 6 40,653,000 1,061,000 5 32,987,000 2,566,000 4 28,541,000 3,311,000 Total 12 $ 81,306,000 $ — 10 $ 65,974,000 $ — 8 $ 57,082,000 $ — Derivative collateral The Bank 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 loan 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 September 30, 2021, the Bank posted to the counterparty $6,600,000 of cash as collateral on its swap contracts. The required amount to be pledged was $3,243,000. Cessation of LIBOR The Company is aware that 1) certain tenors of US Dollar ("USD") denominated London Interbank Offering Rate ("LIBOR") indices will no longer be published after December 31, 2021, while other tenors are expected to continue being published until June 30, 2023, and 2) no new contracts referencing LIBOR are to be written after December 31, 2021. 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 has issued a voluntary fallback protocol for market participants. The Company formed a working group to address LIBOR cessation, which continues to monitor developments from ARRC and ISDA, along with guidance from US banking regulators. A replacement reference rate index for new transactions will be selected prior to year-end 2021 as required. Each of the interest rate swap contracts the Company has in place as of September 30, 2021 is tied to a LIBOR tenor expected to be published until June 2023. Two contracts with a total notional value of $45 million mature prior to June 30, 2023, while an additional seven contracts with a total notional amount of $165 million have maturity dates beyond June 30, 2023. The six customer loan swap contracts shown in the table immediately above have maturity dates of December 19, 2029, August 21, 2030, April 1, 2031, July 1, 2035,

Mortgage Servicing Rights

Mortgage Servicing Rights	9 Months Ended
	Sep. 30, 2021
Transfers and Servicing [Abstract]
Mortgage Servicing Rights	Mortgage Servicing Rights 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. The Company's servicing assets and servicing liabilities are reported using the amortization method and carried at the lower of amortized cost or fair value by strata. 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 is loan prepayments, calculated using a three-months moving average of weekly prepayment data published by the Public Securities Association (PSA) and modeled against the serviced loan portfolio, and the discount rate to discount future cash flows. As of September 30, 2021, the prepayment assumption using the PSA model was 260, which translates into an anticipated prepayment rate of 12.48%. The discount rate is 9.00%. Other assumptions include delinquency rates, foreclosure rates, servicing cost inflation, and annual unit loan cost. All assumptions are adjusted periodically to reflect current circumstances. Amortization of mortgage servicing rights, as well as write-offs due to prepayments of the related mortgage loans, are recorded as a charge against mortgage servicing fee income. For the nine months ended September 30, 2021 and 2020, servicing rights capitalized totaled $859,000 and $926,000, respectively. Servicing rights amortized for the nine-month periods ended September 30, 2021 and 2020 were $485,000 and 252,000, respectively. The fair value of servicing rights was $2,757,000, $1,985,000, and $2,013,000 at September 30, 2021, December 31, 2020 and September 30, 2020, respectively. The Bank serviced loans for others totaling $353,633,000, $318,459,000, and $315,426,000 at September 30, 2021, December 31, 2020, and September 30, 2020, respectively. The Bank recorded an impairment reserve as of September 30, 2021, 2020 and 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: September 30, December 31, September 30, Mortgage servicing rights $ 8,158,000 $ 7,299,000 $ 7,066,000 Accumulated amortization (5,470,000) (4,985,000) (4,846,000) Amortized cost 2,688,000 2,314,000 2,220,000 Impairment reserve (91,000) (358,000) (258,000) Carrying value $ 2,597,000 $ 1,956,000 $ 1,962,000

Income Taxes

Income Taxes	9 Months Ended
	Sep. 30, 2021
Income Tax Disclosure [Abstract]
Income Taxes	Income TaxesFASB 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 IRS for the years ended December 31, 2018 through 2020.

Certificates of Deposit

Certificates of Deposit	9 Months Ended
	Sep. 30, 2021
Deposits [Abstract]
Certificates of Deposit	Certificates of Deposit The following table represents the breakdown of certificates of deposit at September 30, 2021 and 2020, and at December 31, 2020: September 30, 2021 December 31, 2020 September 30, 2020 Certificates of deposit < $100,000 $ 194,373,000 $ 246,875,000 $ 252,461,000 Certificates $100,000 to $250,000 263,860,000 295,672,000 269,881,000 Certificates $250,000 and over 56,334,000 63,038,000 67,589,000 $ 514,567,000 $ 605,585,000 $ 589,931,000

Reclassifications

Reclassifications	9 Months Ended
	Sep. 30, 2021
Accounting Changes and Error Corrections [Abstract]
Reclassifications	ReclassificationsCertain items from the prior year were reclassified in the consolidated financial statements to conform with the current year presentation. These do not have a material impact on the consolidated balance sheet or statement of income and comprehensive income presentations.Impact of Recently Issued Accounting StandardsIn 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 loss models in parallel until adoption of ASU No. 2016-13.

Fair Value

Fair Value	9 Months Ended
	Sep. 30, 2021
Fair Value Disclosures [Abstract]
Fair Value	Fair Value 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 other real estate owned 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. Loans Fair values are estimated for portfolios of loans based on 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 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 time 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 September 30, 2021 and 2020, and December 31, 2020, 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 September 30, 2021, December 31, 2020 and September 30, 2020. At September 30, 2021 Level 1 Level 2 Level 3 Total Securities available for sale U.S. Government-sponsored agencies $ — $ 21,939,000 $ — $ 21,939,000 Mortgage-backed securities — 247,253,000 — 247,253,000 State and political subdivisions — 35,179,000 — 35,179,000 Asset-backed securities — 4,853,000 — 4,853,000 Total securities available for sale — 309,224,000 — 309,224,000 Interest rate swap agreements — 644,000 — 644,000 Customer loan interest swap agreements — 2,663,000 — 2,663,000 Total interest rate swap agreements — 3,307,000 — 3,307,000 Total assets $ — $ 312,531,000 $ — $ 312,531,000 At September 30, 2021 Level 1 Level 2 Level 3 Total Interest rate swap agreements $ — $ 2,589,000 $ — $ 2,589,000 Customer loan interest swap agreements — 2,663,000 — 2,663,000 Total liabilities $ — $ 5,252,000 $ — $ 5,252,000 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 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 September 30, 2020 Level 1 Level 2 Level 3 Total Securities available for sale U.S. Treasury and agency $ — $ 27,497,000 $ — $ 27,497,000 Mortgage-backed securities — 276,424,000 — 276,424,000 State and political subdivisions — 36,219,000 — 36,219,000 Total securities available for sale — 340,140,000 — 340,140,000 Customer loan interest swap agreements — 3,311,000 — 3,311,000 Total assets $ — $ 343,451,000 $ — $ 343,451,000 At September 30, 2020 Level 1 Level 2 Level 3 Total Interest rate swap agreements $ — $ 7,342,000 $ — $ 7,342,000 Customer loan interest swap agreements — 3,311,000 — 3,311,000 Total liabilities $ — $ 10,653,000 $ — $ 10,653,000 Assets Recorded at Fair Value on a Non-Recurring Basis The following tables include 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 $91,000 at September 30, 2021, $358,000 at December 31, 2020 and $258,000 at September 30, 2020. Other real estate owned is presented net of an allowance of $45,000 at December 31, 2020 and September 30, 2020. The Company had no other real estate owned or related allowance at September 30, 2021. 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 $457,000, $304,000 and $633,000 at September 30, 2021, December 31, 2020, and September 30, 2020, respectively. At September 30, 2021 Level 1 Level 2 Level 3 Total Mortgage servicing rights $ — $ 2,757,000 $ — $ 2,757,000 Impaired loans — 224,000 — 224,000 Total assets $ — $ 2,981,000 $ — $ 2,981,000 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 September 30, 2020 Level 1 Level 2 Level 3 Total Mortgage servicing rights $ — $ 2,013,000 $ — $ 2,013,000 Other real estate owned — 777,000 — 777,000 Impaired loans — 789,000 — 789,000 Total assets $ — $ 3,579,000 $ — $ 3,579,000 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. 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 amount and estimated fair values for financial instruments as of September 30, 2021 were as follows: Carrying value Estimated fair value Level 1 Level 2 Level 3 Financial assets Securities to be held to maturity $ 375,699,000 $ 379,797,000 $ — $ 379,797,000 $ — Loans (net of allowance for loan losses) Commercial Real estate 542,975,000 537,937,000 — — 537,937,000 Construction 72,341,000 71,670,000 — — 71,670,000 Other 284,048,000 283,585,000 — 5,000 283,580,000 Municipal 40,409,000 40,133,000 — — 40,133,000 Residential Term 534,794,000 540,586,000 — 219,000 540,367,000 Construction 29,203,000 29,593,000 — — 29,593,000 Home equity line of credit 73,549,000 71,591,000 — — 71,591,000 Consumer 22,386,000 20,578,000 — — 20,578,000 Total loans 1,599,705,000 1,595,673,000 — 224,000 1,595,449,000 Mortgage servicing rights 2,597,000 2,757,000 — 2,757,000 — Financial liabilities Local certificates of deposit $ 238,170,000 $ 239,239,000 $ — $ 239,239,000 $ — National certificates of deposit 276,397,000 279,653,000 — 279,653,000 — Total certificates of deposits 514,567,000 518,892,000 — 518,892,000 — Repurchase agreements 88,109,000 86,114,000 — 86,114,000 — Federal Home Loan Bank and Federal Reserve Bank borrowings 145,092,000 146,411,000 — 146,411,000 — Total borrowed funds 233,201,000 232,525,000 — 232,525,000 — The carrying amounts and estimated fair values for financial instruments as of December 31, 2020 were as follows: Carrying value Estimated 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 deposits 605,585,000 613,791,000 — 613,791,000 — Repurchase agreements 69,340,000 69,497,000 — 69,497,000 — Federal Home Loan Bank advances 192,698,000 194,469,000 — 194,469,000 — Total borrowed funds 262,038,000 263,966,000 — 263,966,000 — The carrying amount and estimated fair values for financial instruments as of September 30, 2020 were as follows: Carrying value Estimated fair value Level 1 Level 2 Level 3 Financial assets Securities to be held to maturity $ 331,962,000 $ 342,062,000 $ — $ 342,062,000 $ — Loans (net of allowance for loan losses) Commercial Real estate 401,822,000 406,575,000 — 13,000 406,562,000 Construction 51,362,000 51,970,000 — — 51,970,000 Other 305,239,000 302,600,000 — 33,000 302,567,000 Municipal 43,955,000 44,203,000 — — 44,203,000 Residential Term 494,864,000 505,357,000 — 277,000 505,080,000 Construction 16,011,000 16,178,000 — — 16,178,000 Home equity line of credit 81,359,000 80,160,000 — 457,000 79,703,000 Consumer 26,663,000 24,686,000 — 9,000 24,677,000 Total loans 1,421,275,000 1,431,729,000 — 789,000 1,430,940,000 Mortgage servicing rights 1,962,000 2,013,000 — 2,013,000 — Financial liabilities Local certificates of deposit $ 253,863,000 $ 255,553,000 $ — $ 255,553,000 $ — National certificates of deposit 336,068,000 343,022,000 — 343,022,000 — Total certificates of deposits 589,931,000 598,575,000 — 598,575,000 — Repurchase agreements 66,087,000 55,085,000 — 55,085,000 — Federal Home Loan Bank advances 217,700,000 197,527,000 — 197,527,000 — Total borrowed funds 283,787,000 252,612,000 — 252,612,000 —

Impact of Recently Issued Accou

Impact of Recently Issued Accounting Standards	9 Months Ended
	Sep. 30, 2021
Accounting Standards Update and Change in Accounting Principle [Abstract]
Impact of Recently Issued Accounting Standards	ReclassificationsCertain items from the prior year were reclassified in the consolidated financial statements to conform with the current year presentation. These do not have a material impact on the consolidated balance sheet or statement of income and comprehensive income presentations.Impact of Recently Issued Accounting StandardsIn 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 loss models in parallel until adoption of ASU No. 2016-13.

Basis of Presentation (Policies

Basis of Presentation (Policies)	9 Months Ended
	Sep. 30, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	Basis of PresentationThe First Bancorp, Inc. ("the Company") is a financial holding company that owns all of the common stock of First National Bank ("the Bank"). The accompanying unaudited consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America ("GAAP") for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by GAAP for complete financial statements. In the opinion of Management, all adjustments (consisting of normally recurring accruals) considered necessary for a fair presentation have been included. All significant intercompany transactions and balances are eliminated in consolidation. The income reported for the 2021 period is not necessarily indicative of the results that may be expected for the year ending December 31, 2021. For further information, refer to the consolidated financial statements and notes included in the Company's annual report on Form 10-K for the year ended December 31, 2020.
Financial Derivative Instruments	The Bank uses derivative financial instruments for risk management purposes and not for trading or speculative purposes. As part of its overall asset and liability management strategy, the Bank periodically uses derivative instruments to minimize significant unplanned fluctuations in earnings and cash flows caused by interest rate volatility. The Bank’s interest rate risk management strategy involves modifying the re-pricing characteristics of certain assets or liabilities so that changes in interest rates do not have a significant effect on net interest income. The Bank recognizes its derivative instruments in the consolidated balance sheet at fair value. On the date the derivative instrument is entered into, the Bank designates whether the derivative is part of a hedging relationship (i.e., cash flow or fair value hedge). The Bank formally documents relationships between hedging instruments and hedged items, as well as its risk management objective and strategy for undertaking hedge transactions. The Bank also assesses, both at the hedge’s inception and on an ongoing basis, whether the derivatives used in hedging transactions are highly effective in offsetting the changes in cash flows or fair values of hedged items. Changes in fair value of derivative instruments that are highly effective and qualify as cash flow hedges are recorded in other comprehensive income or (loss). Any ineffective portion is recorded in earnings. The Bank discontinues hedge accounting when it is determined that the derivative is no longer highly effective in offsetting changes of the hedged risk on the hedged item, or management determines that the designation of the derivative as a hedging instrument is no longer appropriate.
Reclassifications	Certain items from the prior year were reclassified in the consolidated financial statements to conform with the current year presentation. These do not have a material impact on the consolidated balance sheet or statement of income and comprehensive income presentations.
Fair Value	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 other real estate owned 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. Loans Fair values are estimated for portfolios of loans based on 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 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 time 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 September 30, 2021 and 2020, and December 31, 2020, 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 of Financial Instruments	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. 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.
Impact of Recently Issued Accounting Standards	Impact of Recently Issued Accounting StandardsIn 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 loss models in parallel until adoption of ASU No. 2016-13.

Investment Securities (Tables)

Investment Securities (Tables)	9 Months Ended
	Sep. 30, 2021
Investments, Debt and Equity Securities [Abstract]
Schedule of Available For Sale, Held-to-Maturity, and Restricted Equity Securities	The following table summarizes the amortized cost and estimated fair value of investment securities at September 30, 2021: Amortized Unrealized Gains Unrealized Losses Fair Value (Estimated) Securities available for sale U.S. Government-sponsored agencies $ 23,045,000 $ — $ (1,106,000) $ 21,939,000 Mortgage-backed securities 247,606,000 2,751,000 (3,104,000) 247,253,000 State and political subdivisions 34,590,000 895,000 (306,000) 35,179,000 Asset-backed securities 4,777,000 76,000 — 4,853,000 $ 310,018,000 $ 3,722,000 $ (4,516,000) $ 309,224,000 Securities to be held to maturity U.S. Government-sponsored agencies $ 35,600,000 $ 17,000 $ (1,161,000) $ 34,456,000 Mortgage-backed securities 64,651,000 354,000 (1,701,000) 63,304,000 State and political subdivisions 254,198,000 7,251,000 (1,042,000) 260,407,000 Corporate securities 21,250,000 415,000 (35,000) 21,630,000 $ 375,699,000 $ 8,037,000 $ (3,939,000) $ 379,797,000 Restricted equity securities Federal Home Loan Bank Stock $ 7,802,000 $ — $ — $ 7,802,000 Federal Reserve Bank Stock 1,037,000 — — 1,037,000 $ 8,839,000 $ — $ — $ 8,839,000 The following table summarizes the amortized cost and estimated fair value of investment securities at December 31, 2020: Amortized Unrealized Gains Unrealized Losses Fair Value (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 The following table summarizes the amortized cost and estimated fair value of investment securities at September 30, 2020: Amortized Unrealized Gains Unrealized Losses Fair Value (Estimated) Securities available for sale U.S. Government-sponsored agencies $ 27,545,000 $ 180,000 $ (228,000) $ 27,497,000 Mortgage-backed securities 270,336,000 6,737,000 (649,000) 276,424,000 State and political subdivisions 35,271,000 1,240,000 (292,000) 36,219,000 $ 333,152,000 $ 8,157,000 $ (1,169,000) $ 340,140,000 Securities to be held to maturity U.S. Government-sponsored agencies $ 26,146,000 $ 294,000 $ — $ 26,440,000 Mortgage-backed securities 43,414,000 844,000 (119,000) 44,139,000 State and political subdivisions 245,152,000 8,660,000 (69,000) 253,743,000 Corporate securities 17,250,000 490,000 — 17,740,000 $ 331,962,000 $ 10,288,000 $ (188,000) $ 342,062,000 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
Schedule of Contractual Maturities of Investment Securities	The following table summarizes the contractual maturities of investment securities at September 30, 2021: Securities available for sale Securities to be held to maturity Amortized Fair Value (Estimated) Amortized Fair Value (Estimated) Due in 1 year or less $ — $ — $ 3,788,000 $ 3,763,000 Due in 1 to 5 years 6,285,000 6,529,000 18,616,000 19,426,000 Due in 5 to 10 years 37,971,000 38,400,000 171,039,000 176,007,000 Due after 10 years 265,762,000 264,295,000 182,256,000 180,601,000 $ 310,018,000 $ 309,224,000 $ 375,699,000 $ 379,797,000 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 Fair Value (Estimated) Amortized 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 September 30, 2020: Securities available for sale Securities to be held to maturity Amortized Fair Value (Estimated) Amortized Fair Value (Estimated) Due in 1 year or less $ 7,097,000 $ 7,159,000 $ 2,454,000 $ 2,462,000 Due in 1 to 5 years 23,789,000 24,260,000 32,595,000 33,683,000 Due in 5 to 10 years 58,430,000 60,086,000 176,400,000 182,370,000 Due after 10 years 243,836,000 248,635,000 120,513,000 123,547,000 $ 333,152,000 $ 340,140,000 $ 331,962,000 $ 342,062,000
Schedule of Securities Gains and Losses	The following table shows securities gains and losses for the nine months and quarters ended September 30, 2021 and 2020: For the nine months ended September 30, For the quarter ended September 30, 2021 2020 2021 2020 Proceeds from sales of securities $ 19,435,000 $ 79,469,000 $ 3,743,000 $ — Gross realized gains 627,000 1,526,000 1,000 — Gross realized losses (605,000) (347,000) (143,000) — Net gain (loss) $ 22,000 $ 1,179,000 $ (142,000) $ — Related income taxes $ 5,000 $ 248,000 $ (29,000) $ —
Schedule of Securities Temporarily Impaired	Information regarding securities temporarily impaired as of September 30, 2021 is summarized below: Less than 12 months 12 months or more Total Fair Value (Estimated) Unrealized Losses Fair Value (Estimated) Unrealized Losses Fair Value (Estimated) Unrealized Losses U.S. Government-sponsored agencies $ 37,054,000 $ (1,396,000) $ 16,174,000 $ (871,000) $ 53,228,000 $ (2,267,000) Mortgage-backed securities 207,951,000 (4,207,000) 17,337,000 (598,000) 225,288,000 (4,805,000) State and political subdivisions 50,050,000 (1,348,000) — — 50,050,000 (1,348,000) Corporate securities 3,465,000 (35,000) — — 3,465,000 (35,000) $ 298,520,000 $ (6,986,000) $ 33,511,000 $ (1,469,000) $ 332,031,000 $ (8,455,000) 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. Information regarding securities temporarily impaired as of December 31, 2020 is summarized below: Less than 12 months 12 months or more Total Fair Value (Estimated) Unrealized Losses Fair Value (Estimated) Unrealized Losses Fair Value (Estimated) Unrealized 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 September 30, 2020, there were 75 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. Information regarding securities temporarily impaired as of September 30, 2020 is summarized below: Less than 12 months 12 months or more Total Fair Value (Estimated) Unrealized Losses Fair Value (Estimated) Unrealized Losses Fair Value (Estimated) Unrealized Losses U.S. Government-sponsored agencies $ 16,817,000 $ (228,000) $ — $ — $ 16,817,000 $ (228,000) Mortgage-backed securities 79,816,000 (654,000) 4,216,000 (114,000) 84,032,000 (768,000) State and political subdivisions 19,201,000 (361,000) — — 19,201,000 (361,000) $ 115,834,000 $ (1,243,000) $ 4,216,000 $ (114,000) $ 120,050,000 $ (1,357,000)

Loans (Tables)

Loans (Tables)	9 Months Ended
	Sep. 30, 2021
Loans and Leases Receivable Disclosure [Abstract]
Schedule of Composition of Loan Portfolio	The following table shows the composition of the Company's loan portfolio as of September 30, 2021 and 2020 and at December 31, 2020: September 30, 2021 December 31, 2020 September 30, 2020 Commercial Real estate $ 550,077,000 34.0 % $ 442,121,000 29.9 % $ 407,128,000 28.3 % Construction 73,302,000 4.6 % 56,565,000 3.8 % 52,038,000 3.6 % Other 288,121,000 17.8 % 285,015,000 19.3 % 309,297,000 21.5 % Municipal 40,616,000 2.5 % 43,783,000 3.0 % 44,110,000 3.1 % Residential Term 537,811,000 33.3 % 522,070,000 35.3 % 497,667,000 34.6 % Construction 29,358,000 1.8 % 21,600,000 1.5 % 16,101,000 1.2 % Home equity line of credit 74,594,000 4.6 % 79,750,000 5.4 % 82,982,000 5.8 % Consumer 23,333,000 1.4 % 25,857,000 1.8 % 27,323,000 1.9 % Total $ 1,617,212,000 100.0 % $ 1,476,761,000 100.0 % $ 1,436,646,000 100.0 %
Schedule of Past Due Loans Aging	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 September 30, 2021, is presented in the following table: 30-59 Days 60-89 Days 90+ Days All Current Total 90+ Days Commercial Real estate $ 33,000 $ — $ 226,000 $ 259,000 $ 549,818,000 $ 550,077,000 $ 36,000 Construction 13,000 15,000 — 28,000 73,274,000 73,302,000 — Other 92,000 359,000 225,000 676,000 287,445,000 288,121,000 — Municipal — — — — 40,616,000 40,616,000 — Residential Term 549,000 918,000 986,000 2,453,000 535,358,000 537,811,000 190,000 Construction — — — — 29,358,000 29,358,000 — Home equity line of credit 251,000 25,000 131,000 407,000 74,187,000 74,594,000 — Consumer 90,000 202,000 3,000 295,000 23,038,000 23,333,000 3,000 Total $ 1,028,000 $ 1,519,000 $ 1,571,000 $ 4,118,000 $ 1,613,094,000 $ 1,617,212,000 $ 229,000 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 September 30, 2020, is presented in the following table: 30-59 Days 60-89 Days 90+ Days All Current Total 90+ Days Commercial Real estate $ 2,397,000 $ 58,000 $ 454,000 $ 2,909,000 $ 404,219,000 $ 407,128,000 $ — Construction — — 80,000 80,000 51,958,000 52,038,000 — Other 547,000 258,000 1,871,000 2,676,000 306,621,000 309,297,000 1,464,000 Municipal — — — — 44,110,000 44,110,000 — Residential Term 2,550,000 357,000 1,602,000 4,509,000 493,158,000 497,667,000 — Construction — — — — 16,101,000 16,101,000 — Home equity line of credit 868,000 65,000 1,392,000 2,325,000 80,657,000 82,982,000 — Consumer 219,000 28,000 30,000 277,000 27,046,000 27,323,000 30,000 Total $ 6,581,000 $ 766,000 $ 5,429,000 $ 12,776,000 $ 1,423,870,000 $ 1,436,646,000 $ 1,494,000
Schedule of Modification Statuses by Portfolio Segment	Modification statuses by portfolio segment are summarized below: Commercial/Municipal Loan Modifications Units Percentage Balance Percentage Paid Off 156 26 % $ 35,130,000 15 % Charged Off 1 — % 66,000 — % Subsequent Modification 2 — % 1,014,000 — % Still in Original Modification 1 — % 125,000 — % Out of Modification 445 74 % 197,999,000 85 % Total 605 100 % $ 234,334,000 100 % Residential Real Estate Modifications Units Percentage Balance Percentage Paid Off 73 20 % $ 12,694,000 24 % Subsequent Modification 53 14 % 5,405,000 10 % Still in Original Modification 1 — % 22,000 — % Out of Modification 250 66 % 34,457,000 66 % Total 377 100 % $ 52,578,000 100 % Consumer Loan Modifications Units Percentage Balance Percentage Paid Off 23 34 % $ 209,000 21 % Charged Off 1 1 % 10,000 1 % Subsequent Modification 2 3 % 43,000 4 % Out of Modification 43 62 % 748,000 74 % Total 69 100 % $ 1,010,000 100 %
Schedule of Nonaccrual Loans	Information on nonaccrual loans as of September 30, 2021 and 2020 and at December 31, 2020 is presented in the following table: September 30, 2021 December 31, 2020 September 30, 2020 Commercial Real estate $ 604,000 $ 543,000 $ 1,771,000 Construction 23,000 89,000 307,000 Other 1,251,000 1,481,000 503,000 Municipal — — — Residential Term 3,785,000 3,593,000 4,467,000 Construction — — — Home equity line of credit 482,000 1,015,000 2,063,000 Consumer — — — Total $ 6,145,000 $ 6,721,000 $ 9,111,000
Schedule of Impaired Loans by Class of Financing Receivable	A breakdown of impaired loans by class of financing receivable as of and for the period ended September 30, 2021 is presented in the following table: For the nine months ended September 30, 2021 For the quarter ended September 30, 2021 Recorded Investment Unpaid Principal Balance Related Allowance Average Recorded Investment Recognized Interest Income Average Recorded Investment Recognized Interest Income With No Related Allowance Commercial Real estate $ 1,906,000 $ 2,257,000 $ — $ 2,215,000 $ 50,000 $ 2,053,000 $ 15,000 Construction 24,000 25,000 — 69,000 — 24,000 — Other 1,353,000 1,459,000 — 1,534,000 12,000 1,372,000 4,000 Municipal — — — — — — — Residential Term 7,021,000 8,181,000 — 7,231,000 101,000 7,180,000 33,000 Construction — — — 9,000 — — — Home equity line of credit 482,000 516,000 — 725,000 — 546,000 — Consumer 4,000 4,000 — 6,000 — 4,000 — $ 10,790,000 $ 12,442,000 $ — $ 11,789,000 $ 163,000 $ 11,179,000 $ 52,000 With an Allowance Recorded Commercial Real estate $ 894,000 $ 923,000 $ 138,000 $ 940,000 $ 30,000 $ 910,000 $ 10,000 Construction 681,000 681,000 18,000 681,000 17,000 681,000 6,000 Other 402,000 421,000 397,000 466,000 10,000 403,000 5,000 Municipal — — — — — — — Residential Term 1,761,000 1,923,000 129,000 1,753,000 32,000 1,641,000 9,000 Construction — — — — — — — Home equity line of credit 21,000 21,000 — 15,000 — 21,000 — Consumer — — — 1,000 — 3,000 — $ 3,759,000 $ 3,969,000 $ 682,000 $ 3,856,000 $ 89,000 $ 3,659,000 $ 30,000 Total Commercial Real estate $ 2,800,000 $ 3,180,000 $ 138,000 $ 3,155,000 $ 80,000 $ 2,963,000 $ 25,000 Construction 705,000 706,000 18,000 750,000 17,000 705,000 6,000 Other 1,755,000 1,880,000 397,000 2,000,000 22,000 1,775,000 9,000 Municipal — — — — — — — Residential Term 8,782,000 10,104,000 129,000 8,984,000 133,000 8,821,000 42,000 Construction — — — 9,000 — — — Home equity line of credit 503,000 537,000 — 740,000 — 567,000 — Consumer 4,000 4,000 — 7,000 — 7,000 — $ 14,549,000 $ 16,411,000 $ 682,000 $ 15,645,000 $ 252,000 $ 14,838,000 $ 82,000 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 and for the year ended December 31, 2020 is presented in the following table: Recorded Investment Unpaid Principal Balance Related Allowance Average Recorded Investment Recognized Interest Income With No Related Allowance Commercial Real estate $ 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 A breakdown of impaired loans by class of financing receivable as of and for the period ended September 30, 2020 is presented in the following table: For the nine months ended September 30, 2020 For the quarter ended September 30, 2020 Recorded Investment Unpaid Principal Balance Related Allowance Average Recorded Investment Recognized Interest Income Average Recorded Investment Recognized Interest Income With No Related Allowance Commercial Real estate $ 3,730,000 $ 4,528,000 $ — $ 4,673,000 $ 117,000 $ 4,068,000 $ 33,000 Construction 308,000 337,000 — 402,000 — 256,000 — Other 862,000 887,000 — 796,000 19,000 814,000 6,000 Municipal — — — — — — — Residential Term 7,783,000 9,058,000 — 9,173,000 123,000 8,024,000 31,000 Construction — — — — — — — Home equity line of credit 1,478,000 1,551,000 — 1,284,000 10,000 1,438,000 2,000 Consumer — — — — — — — $ 14,161,000 $ 16,361,000 $ — $ 16,328,000 $ 269,000 $ 14,600,000 $ 72,000 With an Allowance Recorded Commercial Real estate $ 1,023,000 $ 1,047,000 $ 135,000 $ 1,032,000 $ 32,000 $ 1,027,000 $ 11,000 Construction 701,000 701,000 19,000 546,000 25,000 701,000 8,000 Other 161,000 183,000 128,000 1,523,000 — 143,000 — Municipal — — — — — — — Residential Term 2,399,000 2,466,000 204,000 2,002,000 63,000 2,207,000 27,000 Construction — — — — — — — Home equity line of credit 886,000 886,000 403,000 981,000 1,000 870,000 1,000 Consumer 10,000 10,000 1,000 10,000 — 3,000 — $ 5,180,000 $ 5,293,000 $ 890,000 $ 6,094,000 $ 121,000 $ 4,951,000 $ 47,000 Total Commercial Real estate $ 4,753,000 $ 5,575,000 $ 135,000 $ 5,705,000 $ 149,000 $ 5,095,000 $ 44,000 Construction 1,009,000 1,038,000 19,000 948,000 25,000 957,000 8,000 Other 1,023,000 1,070,000 128,000 2,319,000 19,000 957,000 6,000 Municipal — — — — — — — Residential Term 10,182,000 11,524,000 204,000 11,175,000 186,000 10,231,000 58,000 Construction — — — — — — — Home equity line of credit 2,364,000 2,437,000 403,000 2,265,000 11,000 2,308,000 3,000 Consumer 10,000 10,000 1,000 10,000 — 3,000 — $ 19,341,000 $ 21,654,000 $ 890,000 $ 22,422,000 $ 390,000 $ 19,551,000 $ 119,000
Schedule of Troubled Debt Restructurings on Financing Receivables	The following table shows TDRs by class and the specific reserve as of September 30, 2021: Number of Loans Balance Specific Reserves Commercial Real estate 10 $ 2,238,000 $ 138,000 Construction 1 681,000 18,000 Other 6 883,000 351,000 Municipal — — — Residential Term 45 6,224,000 129,000 Construction — — — Home equity line of credit 1 21,000 — Consumer 1 4,000 — 64 $ 10,051,000 $ 636,000 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 September 30, 2020: Number of Loans Balance Specific Reserves Commercial Real estate 16 $ 4,054,000 $ 130,000 Construction 1 701,000 19,000 Other 6 729,000 92,000 Municipal — — — Residential Term 51 7,430,000 153,000 Construction — — — Home equity line of credit 3 466,000 — Consumer 1 10,000 1,000 78 $ 13,390,000 $ 395,000 As of September 30, 2021, 12 of the loans classified as TDRs with a total balance of $1,095,000 were more than 30 days past due. Of these loans, two had been placed on TDR status in the previous 12 months. The following table shows these TDRs by class and the associated specific reserves included in the allowance for loan losses as of September 30, 2021: Number of Loans Balance Specific Reserves Commercial Real estate — $ — $ — Construction — — — Other 5 641,000 351,000 Municipal — — — Residential Term 6 450,000 — Construction — — — Home equity line of credit — — — Consumer 1 4,000 — 12 $ 1,095,000 $ 351,000 As of September 30, 2020, 15 of the loans classified as TDRs with a total balance of $2,814,000 were more than 30 days past due. Of these loans, two had been placed on TDR status in the previous 12 months. The following table shows these TDRs by class and the associated specific reserves included in the allowance for loan losses as of September 30, 2020: Number of Loans Balance Specific Reserves Commercial Real estate 3 $ 1,472,000 $ — Construction — — Other 4 424,000 92,000 Municipal — — Residential Term 6 743,000 — Construction — — — Home equity line of credit 1 165,000 — Consumer 1 10,000 1,000 15 $ 2,814,000 $ 93,000 For the nine months ended September 30, 2021, 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 September 30, 2021: Number of Loans Pre-Modification Post-Modification Outstanding Specific Reserves Commercial Real estate — $ — $ — $ — Construction 1 80,000 80,000 — Other 1 261,000 261,000 261,000 Municipal — — — — Residential Term 1 9,000 4,000 — Construction — — — — Home equity line of credit — — — — Consumer — — — — 3 $ 350,000 $ 345,000 $ 261,000 For the nine months ended September 30, 2020, three loans were placed on TDR status. The following table shows these TDRs by class and associated specific reserves included in the allowance for loan losses as of September 30, 2020: Number of Loans Pre-Modification Post-Modification Outstanding Specific Reserves Commercial Real estate — $ — $ — $ — Construction — — — — Other — — — — Municipal — — — — Residential Term 2 235,000 187,000 23,000 Construction — — — — Home equity line of credit — — — — Consumer 1 10,000 10,000 1,000 3 $ 245,000 $ 197,000 $ 24,000 For the quarter ended September 30, 2021, no loans were placed on TDR status. For the quarter ended September 30, 2020, one loan was placed on TDR status. The following table shows this TDR by class and the associated specific reserve included in the allowance for loan losses as of September 30, 2020: Number of Loans Pre-Modification Outstanding Recorded Investment Post-Modification Outstanding Recorded Investment Specific Reserves Commercial Real estate — $ — $ — $ — Construction — — — — Other — — — — Municipal — — — — Residential Term — — — — Construction — — — — Home equity line of credit — — — Consumer 1 10,000 10,000 1,000 1 $ 10,000 $ 10,000 $ 1,000

Allowance for Loan Losses (Tabl

Allowance for Loan Losses (Tables)	9 Months Ended
	Sep. 30, 2021
Receivables [Abstract]
Allowance for Loan Losses by Class of Financing Receivable and Allowance	A breakdown of the allowance for loan losses as of September 30, 2021, December 31, 2020, and September 30, 2020, by class of financing receivable and allowance element, is presented in the following tables: As of September 30, 2021 Specific Reserves on Loans Evaluated Individually for Impairment General Reserves on Loans Based on Historical Loss Experience Reserves for Qualitative Factors Unallocated Total Reserves Commercial Real estate $ 138,000 $ 864,000 $ 5,497,000 $ — $ 6,499,000 Construction 18,000 117,000 744,000 — 879,000 Other 397,000 452,000 2,878,000 — 3,727,000 Municipal — — 189,000 — 189,000 Residential Term 129,000 189,000 2,443,000 — 2,761,000 Construction — 10,000 132,000 — 142,000 Home equity line of credit — 109,000 847,000 — 956,000 Consumer — 263,000 604,000 — 867,000 Unallocated — — — 1,487,000 1,487,000 $ 682,000 $ 2,004,000 $ 13,334,000 $ 1,487,000 $ 17,507,000 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 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 September 30, 2020 Specific Reserves on Loans Evaluated Individually for Impairment General Reserves on Loans Based on Historical Loss Experience Reserves for Qualitative Factors Unallocated Total Reserves Commercial Real estate $ 135,000 $ 686,000 $ 3,940,000 $ — $ 4,761,000 Construction 19,000 87,000 501,000 — 607,000 Other 128,000 521,000 2,993,000 — 3,642,000 Municipal — — 139,000 — 139,000 Residential Term 204,000 275,000 2,037,000 — 2,516,000 Construction — 10,000 71,000 — 81,000 Home equity line of credit 403,000 79,000 975,000 — 1,457,000 Consumer 1,000 168,000 423,000 — 592,000 Unallocated — — — 1,576,000 1,576,000 $ 890,000 $ 1,826,000 $ 11,079,000 $ 1,576,000 $ 15,371,000
Schedule of Risk Ratings for Loans	The following table summarizes the risk ratings for the Company's commercial real estate, commercial construction, commercial other, and municipal loans as of September 30, 2021: Commercial Commercial Commercial Municipal All Risk- 1 Strong $ — $ — $ 2,434,000 $ 8,000 $ 2,442,000 2 Above Average 9,220,000 175,000 7,144,000 38,787,000 55,326,000 3 Satisfactory 92,596,000 1,831,000 79,693,000 354,000 174,474,000 4 Average 355,252,000 47,003,000 155,189,000 1,467,000 558,911,000 5 Watch 79,885,000 24,293,000 38,505,000 — 142,683,000 6 OAEM 3,899,000 — 32,000 — 3,931,000 7 Substandard 9,225,000 — 5,124,000 — 14,349,000 8 Doubtful — — — — — Total $ 550,077,000 $ 73,302,000 $ 288,121,000 $ 40,616,000 $ 952,116,000 The following table summarizes the risk ratings for the Company's commercial real estate, commercial construction, 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 real estate, commercial construction, commercial other, and municipal loans as of September 30, 2020: Commercial Commercial Commercial Municipal All Risk- 1 Strong $ — $ — $ 2,251,000 $ 23,000 $ 2,274,000 2 Above Average 8,492,000 1,627,000 5,361,000 42,262,000 57,742,000 3 Satisfactory 84,178,000 3,145,000 140,360,000 369,000 228,052,000 4 Average 230,954,000 27,907,000 107,552,000 1,456,000 367,869,000 5 Watch 68,565,000 18,919,000 46,211,000 — 133,695,000 6 OAEM 2,028,000 — 1,291,000 — 3,319,000 7 Substandard 12,911,000 440,000 6,271,000 — 19,622,000 8 Doubtful — — — — — Total $ 407,128,000 $ 52,038,000 $ 309,297,000 $ 44,110,000 $ 812,573,000
Schedule of Allowance for Loan Losses Transactions	The following table presents allowance for loan losses activity by class for the nine months and quarter ended September 30, 2021, and allowance for loan loss balances by class and related loan balances by class as of September 30, 2021: Commercial Municipal Residential Home Equity Line of Credit Consumer Unallocated Total Real Estate Construction Other Term Construction For the nine months ended September 30, 2021 Beginning 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 Charge offs 71,000 — 286,000 — 41,000 — — 239,000 — 637,000 Recoveries 95,000 — 83,000 — 12,000 — 60,000 66,000 — 316,000 Provision (credit) 1,297,000 217,000 492,000 18,000 211,000 40,000 (315,000) 262,000 (647,000) 1,575,000 Ending balance $ 6,499,000 $ 879,000 $ 3,727,000 $ 189,000 $ 2,761,000 $ 142,000 $ 956,000 $ 867,000 $ 1,487,000 $ 17,507,000 For the three months ended September 30, 2021 Beginning balance $ 6,088,000 $ 750,000 $ 3,757,000 $ 187,000 $ 2,896,000 $ 160,000 $ 959,000 $ 892,000 $ 1,345,000 $ 17,034,000 Charge offs 66,000 — — — — — — 92,000 — 158,000 Recoveries — — 81,000 — 3,000 — 12,000 10,000 — 106,000 Provision (credit) 477,000 129,000 (111,000) 2,000 (138,000) (18,000) (15,000) 57,000 142,000 525,000 Ending balance $ 6,499,000 $ 879,000 $ 3,727,000 $ 189,000 $ 2,761,000 $ 142,000 $ 956,000 $ 867,000 $ 1,487,000 $ 17,507,000 Allowance for loan losses as of September 30, 2021 Ending balance specifically evaluated for impairment $ 138,000 $ 18,000 $ 397,000 $ — $ 129,000 $ — $ — $ — $ — $ 682,000 Ending balance collectively evaluated for impairment $ 6,361,000 $ 861,000 $ 3,330,000 $ 189,000 $ 2,632,000 $ 142,000 $ 956,000 $ 867,000 $ 1,487,000 $ 16,825,000 Related loan balances as of September 30, 2021 Ending balance $ 550,077,000 $ 73,302,000 $ 288,121,000 $ 40,616,000 $ 537,811,000 $ 29,358,000 $ 74,594,000 $ 23,333,000 $ — $ 1,617,212,000 Ending balance specifically evaluated for impairment $ 2,800,000 $ 705,000 $ 1,755,000 $ — $ 8,782,000 $ — $ 503,000 $ 4,000 $ — $ 14,549,000 Ending balance collectively evaluated for impairment $ 547,277,000 $ 72,597,000 $ 286,366,000 $ 40,616,000 $ 529,029,000 $ 29,358,000 $ 74,091,000 $ 23,329,000 $ — $ 1,602,663,000 The following table presents allowance for loan losses activity by class for the year ended December 31, 2020 and allowance for loan loss balances by class and related loan balances by class as of December 31, 2020: Commercial Municipal Residential Home Equity Line of Credit Consumer Unallocated Total Real Estate Construction Other Term Construction For the year ended December 31, 2020 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 Charge offs 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 Allowance for loan losses as of December 31, 2020 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 as of December 31, 2020 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 The following table presents allowance for loan losses activity by class for the nine months and quarter ended September 30, 2020, and allowance for loan loss balances by class and related loan balances by class as of September 30, 2020: Commercial Municipal Residential Home Equity Line of Credit Consumer Unallocated Total Real Estate Construction Other Term Construction For the nine months ended September 30, 2020 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 Charge offs 532,000 — 24,000 — 46,000 — 153,000 238,000 — 993,000 Recoveries — — 24,000 — 31,000 — 20,000 100,000 — 175,000 Provision (credit) 1,551,000 242,000 313,000 112,000 1,507,000 56,000 512,000 (137,000) 394,000 4,550,000 Ending balance $ 4,761,000 $ 607,000 $ 3,642,000 $ 139,000 $ 2,516,000 $ 81,000 $ 1,457,000 $ 592,000 $ 1,576,000 $ 15,371,000 For the three months ended September 30, 2020 Beginning balance $ 4,511,000 $ 524,000 $ 3,689,000 $ 110,000 $ 2,261,000 $ 64,000 $ 1,284,000 $ 658,000 $ 1,009,000 $ 14,110,000 Charge offs 532,000 — 7,000 — — — — 37,000 — 576,000 Recoveries — — 4,000 — 5,000 — 1,000 27,000 — 37,000 Provision (credit) 782,000 83,000 (44,000) 29,000 250,000 17,000 172,000 (56,000) 567,000 1,800,000 Ending balance $ 4,761,000 $ 607,000 $ 3,642,000 $ 139,000 $ 2,516,000 $ 81,000 $ 1,457,000 $ 592,000 $ 1,576,000 $ 15,371,000 Allowance for loan losses as of September 30, 2020 Ending balance specifically evaluated for impairment $ 135,000 $ 19,000 $ 128,000 $ — $ 204,000 $ — $ 403,000 $ 1,000 $ — $ 890,000 Ending balance collectively evaluated for impairment $ 4,626,000 $ 588,000 $ 3,514,000 $ 139,000 $ 2,312,000 $ 81,000 $ 1,054,000 $ 591,000 $ 1,576,000 $ 14,481,000 Related loan balances as of September 30, 2020 Ending balance $ 407,128,000 $ 52,038,000 $ 309,297,000 $ 44,110,000 $ 497,667,000 $ 16,101,000 $ 82,982,000 $ 27,323,000 $ — $ 1,436,646,000 Ending balance specifically evaluated for impairment $ 4,753,000 $ 1,009,000 $ 1,023,000 $ — $ 10,182,000 $ — $ 2,364,000 $ 10,000 $ — $ 19,341,000 Ending balance collectively evaluated for impairment $ 402,375,000 $ 51,029,000 $ 308,274,000 $ 44,110,000 $ 487,485,000 $ 16,101,000 $ 80,618,000 $ 27,313,000 $ — $ 1,417,305,000

Stock-Based Compensation (Table

Stock-Based Compensation (Tables)	9 Months Ended
	Sep. 30, 2021
Share-based Payment Arrangement [Abstract]
Schedule of Nonvested Restricted Stock Units Activity	As of September 30, 2021, 184,487 shares of restricted stock had been granted under the 2010 Plan and 40,189 shares under the 2020 Plan, of which 81,240 shares remain restricted as of September 30, 2021 as detailed in the following table: Year Vesting Term Shares Remaining Term 2017 5.0 5,774 0.3 2018 4.0 706 0.3 2018 5.0 6,184 1.3 2019 3.0 16,254 0.3 2020 2.0 694 0.3 2020 3.0 20,342 1.3 2021 1.0 4,114 0.3 2021 3.0 27,172 2.3 81,240 1.3

Earnings Per Share (Tables)

Earnings Per Share (Tables)	9 Months Ended
	Sep. 30, 2021
Earnings Per Share [Abstract]
Schedule of Basic and Diluted Earnings per Share (EPS)	The following table sets forth the computation of basic and diluted earnings per share (EPS) for the nine months ended September 30, 2021 and 2020: Income (Numerator) Shares (Denominator) Per-Share Amount For the nine months ended September 30, 2021 Net income as reported $ 26,723,000 Basic EPS: Income available to common shareholders 26,723,000 10,901,793 $ 2.45 Effect of dilutive securities: restricted stock 82,157 Diluted EPS: Income available to common shareholders plus assumed conversions $ 26,723,000 10,983,950 $ 2.43 For the nine months ended September 30, 2020 Net income as reported $ 20,159,000 Basic EPS: Income available to common shareholders 20,159,000 10,854,384 $ 1.86 Effect of dilutive securities: restricted stock 73,285 Diluted EPS: Income available to common shareholders plus assumed conversions $ 20,159,000 10,927,669 $ 1.84 The following table sets forth the computation of basic and diluted earnings per share (EPS) for the quarters ended September 30, 2021 and 2020: Income (Numerator) Shares (Denominator) Per-Share Amount For the quarter ended September 30, 2021 Net income as reported $ 9,014,000 Basic EPS: Income available to common shareholders 9,014,000 10,909,338 $ 0.83 Effect of dilutive securities: restricted stock 81,811 Diluted EPS: Income available to common shareholders plus assumed conversions $ 9,014,000 10,991,149 $ 0.82 For the quarter ended September 30, 2020 Net income as reported $ 7,095,000 Basic EPS: Income available to common shareholders 7,095,000 10,863,315 $ 0.65 Effect of dilutive securities: restricted stock 76,544 Diluted EPS: Income available to common shareholders plus assumed conversions $ 7,095,000 10,939,859 $ 0.65

Employee Benefit Plans (Tables)

Employee Benefit Plans (Tables)	9 Months Ended
	Sep. 30, 2021
Retirement Benefits, Description [Abstract]
Schedule of Accumulated Post-retirement Benefit Obligation and Funded Status	The following table sets forth the accumulated postretirement benefit obligation and funded status: At or for the nine months ended September 30, 2021 2020 Change in benefit obligation Benefit obligation at beginning of year $ 1,523,000 $ 1,581,000 Interest cost 21,000 48,000 Benefits paid (72,000) (81,000) Benefit obligation at end of period $ 1,472,000 $ 1,548,000 Funded status Benefit obligation at end of period $ (1,472,000) $ (1,548,000) Unamortized gain (35,000) (31,000) Accrued benefit cost at end of period $ (1,507,000) $ (1,579,000)
Schedule of Net Pension Costs	The following table sets forth the net periodic pension cost: For the nine months ended September 30, For the quarter ended September 30, 2021 2020 2021 2020 Components of net periodic benefit cost Interest cost $ 21,000 $ 48,000 $ 6,000 $ 16,000 Net periodic benefit cost $ 21,000 $ 48,000 $ 6,000 $ 16,000
Schedule of Net Periodic Benefit Cost Not Yet Recognized	Amounts not yet reflected in net periodic benefit cost and included in accumulated other comprehensive income are as follows: September 30, December 31, 2020 September 30, Unamortized net actuarial gain $ 35,000 $ 35,000 $ 31,000 Deferred tax expense (7,000) (7,000) (7,000) Net unrecognized postretirement benefits included in accumulated other comprehensive income $ 28,000 $ 28,000 $ 24,000

Other Comprehensive Income (L_2

Other Comprehensive Income (Loss) (Tables)	9 Months Ended
	Sep. 30, 2021
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 nine months and quarter ended September 30, 2021 and 2020. For the nine months ended September 30, For the quarter ended September 30, 2021 2020 2021 2020 Balance at beginning of period $ 5,009,000 $ 3,657,000 $ 1,190,000 $ 7,100,000 Unrealized gains (losses) arising during the period (7,112,000) 3,537,000 (2,442,000) (2,000,000) Reclassification of net realized (gains) losses during the period (22,000) (1,179,000) 142,000 — Related deferred taxes 1,498,000 (495,000) 483,000 420,000 Net change (5,636,000) 1,863,000 (1,817,000) (1,580,000) Balance at end of period $ (627,000) $ 5,520,000 $ (627,000) $ 5,520,000 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 nine months and quarter ended September 30, 2021 and 2020. For the nine months ended September 30, For the quarter ended September 30, 2021 2020 2021 2020 Balance at beginning of period $ (133,000) $ (182,000) $ (113,000) $ (146,000) Amortization of net unrealized gains 43,000 54,000 18,000 9,000 Related deferred taxes (9,000) (11,000) (4,000) (2,000) Net change 34,000 43,000 14,000 7,000 Balance at end of period $ (99,000) $ (139,000) $ (99,000) $ (139,000) The following table presents the effect of the Company's derivative financial instruments included in other comprehensive income (loss) for the nine months and quarter ended September 30, 2021 and 2020. For the nine months ended September 30, For the quarter ended September 30, 2021 2020 2021 2020 Balance at beginning of period $ (4,932,000) $ 97,000 $ (2,083,000) $ (6,187,000) Unrealized gains (losses) on cash flow hedging derivatives arising during the period 4,297,000 (7,465,000) 691,000 490,000 Related deferred taxes (902,000) 1,568,000 (145,000) (103,000) Net change 3,395,000 (5,897,000) 546,000 387,000 Balance at end of period $ (1,537,000) $ (5,800,000) $ (1,537,000) $ (5,800,000) There was no activity in the unrealized gain or loss on postretirement benefits included in other comprehensive income (loss) for the nine months and quarter ended September 30, 2021 and 2020.

Financial Derivative Instrume_2

Financial Derivative Instruments (Tables)	9 Months Ended
	Sep. 30, 2021
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule of Derivative Instruments	The details of the interest rate swap agreements are as follows: September 30, 2021 December 31, 2020 September 30, 2020 Effective Date Maturity Date Variable Index Received Fixed Rate Paid Presentation on Consolidated Balance Sheet Notional Amount Fair Value Notional Amount Fair Value Notional Amount Fair Value 06/28/2016 06/28/2021 1-Month USD Libor 0.940% Other Liabilities $ — $ — $ 30,000,000 $ (121,000) $ 30,000,000 $ (179,000) 06/27/2016 06/27/2021 1-Month USD Libor 0.893% Other Liabilities — — 20,000,000 (76,000) 20,000,000 (112,000) 08/02/2019 08/02/2024 1-Month USD Libor 1.590% Other Liabilities 12,500,000 (381,000) 12,500,000 (626,000) 12,500,000 (692,000) 08/05/2019 08/05/2024 1-Month USD Libor 1.420% Other Liabilities 12,500,000 (320,000) 12,500,000 (550,000) 12,500,000 (611,000) 02/12/2020 02/12/2023 3-Month USD Libor 1.486% Other Liabilities 25,000,000 (438,000) 25,000,000 (695,000) 25,000,000 (762,000) 02/12/2020 02/12/2024 3-Month USD Libor 1.477% Other Liabilities 25,000,000 (601,000) 25,000,000 (972,000) 25,000,000 (1,044,000) 06/28/2021 06/28/2026 1-Month USD Libor 1.158% Other Liabilities 50,000,000 (594,000) 50,000,000 (1,872,000) 50,000,000 (2,162,000) 03/13/2020 03/13/2025 3-Month USD Libor 0.855% Other Liabilities 25,000,000 (85,000) 25,000,000 (551,000) 25,000,000 (621,000) 03/13/2020 03/13/2030 3-Month USD Libor 1.029% Other (Liabilities) Assets 20,000,000 644,000 20,000,000 (339,000) 20,000,000 (690,000) 04/07/2020 04/07/2023 3-Month USD Libor 0.599% Other Liabilities 20,000,000 (106,000) 20,000,000 (185,000) 20,000,000 (194,000) 04/07/2020 04/07/2024 3-Month USD Libor 0.643% Other Liabilities 20,000,000 (64,000) 20,000,000 (255,000) 20,000,000 (275,000) $210,000,000 $(1,945,000) $260,000,000 $(6,242,000) $260,000,000 $(7,342,000) At September 30, 2021, there were six customer loan swap arrangements in place, detailed below: September 30, 2021 December 31, 2020 September 30, 2020 Presentation on Consolidated Balance Sheet Number of Positions Notional Amount Fair Value Number of Positions Notional Amount Fair Value Number of Positions Notional Amount Fair Value Pay Fixed, Receive Variable Other Assets 3 $ 15,885,000 $ 801,000 3 $ 16,922,000 $ 37,000 — $ — $ — Pay Fixed, Receive Variable Other Liabilities 3 24,768,000 (1,862,000) 2 16,065,000 (2,603,000) 4 28,541,000 (3,311,000) 6 40,653,000 (1,061,000) 5 32,987,000 (2,566,000) 4 28,541,000 (3,311,000) Receive Fixed, Pay Variable Other Assets 3 24,768,000 1,862,000 2 16,065,000 2,603,000 4 28,541,000 3,311,000 Receive Fixed, Pay Variable Other Liabilities 3 15,885,000 (801,000) 3 16,922,000 (37,000) — — — 6 40,653,000 1,061,000 5 32,987,000 2,566,000 4 28,541,000 3,311,000 Total 12 $ 81,306,000 $ — 10 $ 65,974,000 $ — 8 $ 57,082,000 $ —

Mortgage Servicing Rights (Tabl

Mortgage Servicing Rights (Tables)	9 Months Ended
	Sep. 30, 2021
Transfers and Servicing [Abstract]
Reconciliation of Mortgage Servicing Assets	Mortgage servicing rights are included in other assets and detailed in the following table: September 30, December 31, September 30, Mortgage servicing rights $ 8,158,000 $ 7,299,000 $ 7,066,000 Accumulated amortization (5,470,000) (4,985,000) (4,846,000) Amortized cost 2,688,000 2,314,000 2,220,000 Impairment reserve (91,000) (358,000) (258,000) Carrying value $ 2,597,000 $ 1,956,000 $ 1,962,000

Certificates of Deposit (Tables

Certificates of Deposit (Tables)	9 Months Ended
	Sep. 30, 2021
Deposits [Abstract]
Schedule of Certificates of Deposit	The following table represents the breakdown of certificates of deposit at September 30, 2021 and 2020, and at December 31, 2020: September 30, 2021 December 31, 2020 September 30, 2020 Certificates of deposit < $100,000 $ 194,373,000 $ 246,875,000 $ 252,461,000 Certificates $100,000 to $250,000 263,860,000 295,672,000 269,881,000 Certificates $250,000 and over 56,334,000 63,038,000 67,589,000 $ 514,567,000 $ 605,585,000 $ 589,931,000

Fair Value (Tables)

Fair Value (Tables)	9 Months Ended
	Sep. 30, 2021
Fair Value Disclosures [Abstract]
Schedule of 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 September 30, 2021, December 31, 2020 and September 30, 2020. At September 30, 2021 Level 1 Level 2 Level 3 Total Securities available for sale U.S. Government-sponsored agencies $ — $ 21,939,000 $ — $ 21,939,000 Mortgage-backed securities — 247,253,000 — 247,253,000 State and political subdivisions — 35,179,000 — 35,179,000 Asset-backed securities — 4,853,000 — 4,853,000 Total securities available for sale — 309,224,000 — 309,224,000 Interest rate swap agreements — 644,000 — 644,000 Customer loan interest swap agreements — 2,663,000 — 2,663,000 Total interest rate swap agreements — 3,307,000 — 3,307,000 Total assets $ — $ 312,531,000 $ — $ 312,531,000 At September 30, 2021 Level 1 Level 2 Level 3 Total Interest rate swap agreements $ — $ 2,589,000 $ — $ 2,589,000 Customer loan interest swap agreements — 2,663,000 — 2,663,000 Total liabilities $ — $ 5,252,000 $ — $ 5,252,000 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 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 September 30, 2020 Level 1 Level 2 Level 3 Total Securities available for sale U.S. Treasury and agency $ — $ 27,497,000 $ — $ 27,497,000 Mortgage-backed securities — 276,424,000 — 276,424,000 State and political subdivisions — 36,219,000 — 36,219,000 Total securities available for sale — 340,140,000 — 340,140,000 Customer loan interest swap agreements — 3,311,000 — 3,311,000 Total assets $ — $ 343,451,000 $ — $ 343,451,000 At September 30, 2020 Level 1 Level 2 Level 3 Total Interest rate swap agreements $ — $ 7,342,000 $ — $ 7,342,000 Customer loan interest swap agreements — 3,311,000 — 3,311,000 Total liabilities $ — $ 10,653,000 $ — $ 10,653,000
Schedule of Assets Measured on Nonrecurring Basis Measured at Fair Value	The following tables include 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 $91,000 at September 30, 2021, $358,000 at December 31, 2020 and $258,000 at September 30, 2020. Other real estate owned is presented net of an allowance of $45,000 at December 31, 2020 and September 30, 2020. The Company had no other real estate owned or related allowance at September 30, 2021. 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 $457,000, $304,000 and $633,000 at September 30, 2021, December 31, 2020, and September 30, 2020, respectively. At September 30, 2021 Level 1 Level 2 Level 3 Total Mortgage servicing rights $ — $ 2,757,000 $ — $ 2,757,000 Impaired loans — 224,000 — 224,000 Total assets $ — $ 2,981,000 $ — $ 2,981,000 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 September 30, 2020 Level 1 Level 2 Level 3 Total Mortgage servicing rights $ — $ 2,013,000 $ — $ 2,013,000 Other real estate owned — 777,000 — 777,000 Impaired loans — 789,000 — 789,000 Total assets $ — $ 3,579,000 $ — $ 3,579,000
Schedule of Estimated Fair Value of Financial Instruments	The carrying amount and estimated fair values for financial instruments as of September 30, 2021 were as follows: Carrying value Estimated fair value Level 1 Level 2 Level 3 Financial assets Securities to be held to maturity $ 375,699,000 $ 379,797,000 $ — $ 379,797,000 $ — Loans (net of allowance for loan losses) Commercial Real estate 542,975,000 537,937,000 — — 537,937,000 Construction 72,341,000 71,670,000 — — 71,670,000 Other 284,048,000 283,585,000 — 5,000 283,580,000 Municipal 40,409,000 40,133,000 — — 40,133,000 Residential Term 534,794,000 540,586,000 — 219,000 540,367,000 Construction 29,203,000 29,593,000 — — 29,593,000 Home equity line of credit 73,549,000 71,591,000 — — 71,591,000 Consumer 22,386,000 20,578,000 — — 20,578,000 Total loans 1,599,705,000 1,595,673,000 — 224,000 1,595,449,000 Mortgage servicing rights 2,597,000 2,757,000 — 2,757,000 — Financial liabilities Local certificates of deposit $ 238,170,000 $ 239,239,000 $ — $ 239,239,000 $ — National certificates of deposit 276,397,000 279,653,000 — 279,653,000 — Total certificates of deposits 514,567,000 518,892,000 — 518,892,000 — Repurchase agreements 88,109,000 86,114,000 — 86,114,000 — Federal Home Loan Bank and Federal Reserve Bank borrowings 145,092,000 146,411,000 — 146,411,000 — Total borrowed funds 233,201,000 232,525,000 — 232,525,000 — The carrying amounts and estimated fair values for financial instruments as of December 31, 2020 were as follows: Carrying value Estimated 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 deposits 605,585,000 613,791,000 — 613,791,000 — Repurchase agreements 69,340,000 69,497,000 — 69,497,000 — Federal Home Loan Bank advances 192,698,000 194,469,000 — 194,469,000 — Total borrowed funds 262,038,000 263,966,000 — 263,966,000 — The carrying amount and estimated fair values for financial instruments as of September 30, 2020 were as follows: Carrying value Estimated fair value Level 1 Level 2 Level 3 Financial assets Securities to be held to maturity $ 331,962,000 $ 342,062,000 $ — $ 342,062,000 $ — Loans (net of allowance for loan losses) Commercial Real estate 401,822,000 406,575,000 — 13,000 406,562,000 Construction 51,362,000 51,970,000 — — 51,970,000 Other 305,239,000 302,600,000 — 33,000 302,567,000 Municipal 43,955,000 44,203,000 — — 44,203,000 Residential Term 494,864,000 505,357,000 — 277,000 505,080,000 Construction 16,011,000 16,178,000 — — 16,178,000 Home equity line of credit 81,359,000 80,160,000 — 457,000 79,703,000 Consumer 26,663,000 24,686,000 — 9,000 24,677,000 Total loans 1,421,275,000 1,431,729,000 — 789,000 1,430,940,000 Mortgage servicing rights 1,962,000 2,013,000 — 2,013,000 — Financial liabilities Local certificates of deposit $ 253,863,000 $ 255,553,000 $ — $ 255,553,000 $ — National certificates of deposit 336,068,000 343,022,000 — 343,022,000 — Total certificates of deposits 589,931,000 598,575,000 — 598,575,000 — Repurchase agreements 66,087,000 55,085,000 — 55,085,000 — Federal Home Loan Bank advances 217,700,000 197,527,000 — 197,527,000 — Total borrowed funds 283,787,000 252,612,000 — 252,612,000 —

Investment Securities - Summary

Investment Securities - Summary of Amortized Cost and Estimated Fair Value, AFS (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020	Sep. 30, 2020
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 310,018	$ 307,036	$ 333,152
Unrealized Gains	3,722	7,272	8,157
Unrealized Losses	(4,516)	(932)	(1,169)
Fair Value (Estimated)	309,224	313,376	340,140
U.S. Government-sponsored agencies
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	23,045	23,045	27,545
Unrealized Gains	0	0	180
Unrealized Losses	(1,106)	(315)	(228)
Fair Value (Estimated)	21,939	22,730	27,497
Mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	247,606	238,516	270,336
Unrealized Gains	2,751	5,507	6,737
Unrealized Losses	(3,104)	(617)	(649)
Fair Value (Estimated)	247,253	243,406	276,424
State and political subdivisions
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	34,590	37,752	35,271
Unrealized Gains	895	1,722	1,240
Unrealized Losses	(306)	0	(292)
Fair Value (Estimated)	35,179	39,474	$ 36,219
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	4,777	7,723
Unrealized Gains	76	43
Unrealized Losses	0	0
Fair Value (Estimated)	$ 4,853	$ 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	Sep. 30, 2021	Dec. 31, 2020	Sep. 30, 2020
Debt Securities, Held-to-maturity, Fair Value to Amortized Cost [Abstract]
Amortized Cost	$ 375,699	$ 365,613	$ 331,962
Unrealized Gains	8,037	11,739	10,288
Unrealized Losses	(3,939)	(218)	(188)
Fair Value (Estimated)	379,797	377,134	342,062
Equity Securities, Restricted [Abstract]
Federal Home Loan Bank Stock	7,802	9,508	9,508
Federal Reserve Bank Stock	1,037	1,037	1,037
Restricted equity securities	8,839	10,545	10,545
U.S. Government-sponsored agencies
Debt Securities, Held-to-maturity, Fair Value to Amortized Cost [Abstract]
Amortized Cost	35,600	44,149	26,146
Unrealized Gains	17	143	294
Unrealized Losses	(1,161)	(18)	0
Fair Value (Estimated)	34,456	44,274	26,440
Mortgage-backed securities
Debt Securities, Held-to-maturity, Fair Value to Amortized Cost [Abstract]
Amortized Cost	64,651	53,594	43,414
Unrealized Gains	354	736	844
Unrealized Losses	(1,701)	(195)	(119)
Fair Value (Estimated)	63,304	54,135	44,139
State and political subdivisions
Debt Securities, Held-to-maturity, Fair Value to Amortized Cost [Abstract]
Amortized Cost	254,198	245,620	245,152
Unrealized Gains	7,251	10,427	8,660
Unrealized Losses	(1,042)	(3)	(69)
Fair Value (Estimated)	260,407	256,044	253,743
Corporate securities
Debt Securities, Held-to-maturity, Fair Value to Amortized Cost [Abstract]
Amortized Cost	21,250	22,250	17,250
Unrealized Gains	415	433	490
Unrealized Losses	(35)	(2)	0
Fair Value (Estimated)	$ 21,630	$ 22,681	$ 17,740

Investment Securities - Summa_3

Investment Securities - Summary of Contractual Maturities (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020	Sep. 30, 2020
Securities available for sale
Amortized Cost, Due in 1 year or less	$ 0	$ 117	$ 7,097
Fair Value (Estimated), Due in 1 year or less	0	120	7,159
Amortized Cost, Due in 1 to 5 years	6,285	17,718	23,789
Fair Value (Estimated), Due in 1 to 5 years	6,529	17,915	24,260
Amortized Cost, Due in 5 to 10 years	37,971	49,697	58,430
Fair Value (Estimated), Due in 1 to 5 years	38,400	51,001	60,086
Amortized Cost, Due after 10 years	265,762	239,504	243,836
Fair Value (Estimated), Due after 10 years	264,295	244,340	248,635
Fair Value (Estimated)	309,224	313,376	340,140
Amortized Cost	310,018	307,036	333,152
Securities to be held to maturity
Amortized Cost, Due in 1 year or less	3,788	3,607	2,454
Fair Value (Estimated), Due in 1 year or less	3,763	3,641	2,462
Amortized Cost, Due in 1 to 5 years	18,616	30,867	32,595
Fair Value (Estimated), Due in 1 to 5 years	19,426	31,792	33,683
Amortized Cost, Due in 5 to 10 years	171,039	183,679	176,400
Fair Value (Estimated), Due in 1 to 5 years	176,007	190,153	182,370
Amortized Cost, Due after 10 years	182,256	147,460	120,513
Fair Value (Estimated), Due after 10 years	180,601	151,548	123,547
Amortized Cost	375,699	365,613	331,962
Securities to be held to maturity, Fair Value (Estimated)	$ 379,797	$ 377,134	$ 342,062

Investment Securities - Narrati

Investment Securities - Narrative (Details)	9 Months Ended		12 Months Ended
	Sep. 30, 2021USD ($)securitystate	Sep. 30, 2020USD ($)security	Dec. 31, 2020USD ($)security	Jun. 30, 2020security	Sep. 30, 2014USD ($)
Debt Securities, Available-for-sale [Line Items]
Number of securities temporarily impaired (security) | security	184	75	50
Number of securities temporarily impaired for twelve months or more (security) | security	19	10	10
Period of temporary impairment	12 months	12 months	12 months
Amortized cost of securities transferred					$ 89,780,000
Fair value of securities transferred					89,757,000
Net unrealized loss, net of taxes on transferred securities					$ 15,000
Unamortized balance of net unrealized losses transferred	$ 99,000	$ 139,000	$ 133,000
Number of states | state	6
FHLB stock investment	$ 7,802,000	9,508,000	9,508,000
Impairment losses	0
State and political subdivisions
Debt Securities, Available-for-sale [Line Items]
Number of securities temporarily impaired (security) | security				28
Proceeds from sales of municipal securities	8,600,000
Cumulative book value	8,332,000
Net realized gain from sale of municipal securities	268,000
Other equity securities
Debt Securities, Available-for-sale [Line Items]
Securities pledged as collateral	$ 349,978,000	$ 285,253,000	$ 297,326,000

Investment Securities - Securit

Investment Securities - Securities Gains and Losses (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Investments, Debt and Equity Securities [Abstract]
Proceeds from sales of securities	$ 3,743	$ 0	$ 19,435	$ 79,469
Gross realized gains	1	0	627	1,526
Gross realized losses	(143)	0	(605)	(347)
Net gain (loss)	(142)	0	22	1,179
Related income taxes	$ (29)	$ 0	$ 5	$ 248

Investment Securities - Secur_2

Investment Securities - Securities Temporarily Impaired (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020	Sep. 30, 2020
Debt Securities, Available-for-sale [Line Items]
Fair Value (Estimated) (Less than 12 months)	$ 298,520	$ 99,070	$ 115,834
Unrealized Losses (Less than 12 months)	(6,986)	(1,062)	(1,243)
Fair Value (Estimated) (12 months or more)	33,511	3,878	4,216
Unrealized Losses (12 months or more)	(1,469)	(88)	(114)
Fair Value (Estimated)	332,031	102,948	120,050
Unrealized Losses	(8,455)	(1,150)	(1,357)
U.S. Government-sponsored agencies
Debt Securities, Available-for-sale [Line Items]
Fair Value (Estimated) (Less than 12 months)	37,054	30,212	16,817
Unrealized Losses (Less than 12 months)	(1,396)	(333)	(228)
Fair Value (Estimated) (12 months or more)	16,174	0	0
Unrealized Losses (12 months or more)	(871)	0	0
Fair Value (Estimated)	53,228	30,212	16,817
Unrealized Losses	(2,267)	(333)	(228)
Mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Fair Value (Estimated) (Less than 12 months)	207,951	65,505	79,816
Unrealized Losses (Less than 12 months)	(4,207)	(724)	(654)
Fair Value (Estimated) (12 months or more)	17,337	3,878	4,216
Unrealized Losses (12 months or more)	(598)	(88)	(114)
Fair Value (Estimated)	225,288	69,383	84,032
Unrealized Losses	(4,805)	(812)	(768)
State and political subdivisions
Debt Securities, Available-for-sale [Line Items]
Fair Value (Estimated) (Less than 12 months)	50,050	855	19,201
Unrealized Losses (Less than 12 months)	(1,348)	(3)	(361)
Fair Value (Estimated) (12 months or more)	0	0	0
Unrealized Losses (12 months or more)	0	0	0
Fair Value (Estimated)	50,050	855	19,201
Unrealized Losses	(1,348)	(3)	$ (361)
Corporate securities
Debt Securities, Available-for-sale [Line Items]
Fair Value (Estimated) (Less than 12 months)	3,465	2,498
Unrealized Losses (Less than 12 months)	(35)	(2)
Fair Value (Estimated) (12 months or more)	0	0
Unrealized Losses (12 months or more)	0	0
Fair Value (Estimated)	3,465	2,498
Unrealized Losses	$ (35)	$ (2)

Loans - Loan Portfolio (Details

Loans - Loan Portfolio (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020	Sep. 30, 2020
Schedule of Financing Receivables [Line Items]
Loans	$ 1,617,212	$ 1,476,761	$ 1,436,646
Percentage of loans receivable, by type	100.00%	100.00%	100.00%
Commercial |    Real estate
Schedule of Financing Receivables [Line Items]
Loans	$ 550,077	$ 442,121	$ 407,128
Percentage of loans receivable, by type	34.00%	29.90%	28.30%
Commercial |    Construction
Schedule of Financing Receivables [Line Items]
Loans	$ 73,302	$ 56,565	$ 52,038
Percentage of loans receivable, by type	4.60%	3.80%	3.60%
Commercial |    Other
Schedule of Financing Receivables [Line Items]
Loans	$ 288,121	$ 285,015	$ 309,297
Percentage of loans receivable, by type	17.80%	19.30%	21.50%
Municipal
Schedule of Financing Receivables [Line Items]
Loans	$ 40,616	$ 43,783	$ 44,110
Percentage of loans receivable, by type	2.50%	3.00%	3.10%
Residential |    Construction
Schedule of Financing Receivables [Line Items]
Loans	$ 29,358	$ 21,600	$ 16,101
Percentage of loans receivable, by type	1.80%	1.50%	1.20%
Residential |    Term
Schedule of Financing Receivables [Line Items]
Loans	$ 537,811	$ 522,070	$ 497,667
Percentage of loans receivable, by type	33.30%	35.30%	34.60%
Home equity line of credit
Schedule of Financing Receivables [Line Items]
Loans	$ 74,594	$ 79,750	$ 82,982
Percentage of loans receivable, by type	4.60%	5.40%	5.80%
Consumer
Schedule of Financing Receivables [Line Items]
Loans	$ 23,333	$ 25,857	$ 27,323
Percentage of loans receivable, by type	1.40%	1.80%	1.90%

Loans - Narrative (Details)

Loans - Narrative (Details) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2021USD ($)loan	Sep. 30, 2020USD ($)loan	Sep. 30, 2021USD ($)loanloan_modification_request	Sep. 30, 2020USD ($)loan	Dec. 31, 2020USD ($)loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Net deferred loan costs included in loan balances	$ 6,597	$ 5,323	$ 6,597	$ 5,323	$ 6,931
Loans used to collateralize borrowings from the Federal Home Loan Bank of Boston	356,517	379,387	356,517	379,387	378,183
Commercial, construction and home equity loans used to collateralize unused line of credit at the Federal Reserve Bank of Boston	291,188	271,905	$ 291,188	$ 271,905	$ 259,599
Number of loans | loan			64	78	74
Loans	$ 1,617,212	$ 1,436,646	$ 1,617,212	$ 1,436,646	$ 1,476,761
Percentage of loans receivable, by type	100.00%	100.00%	100.00%	100.00%	100.00%
TDR recorded investment	$ 10,051	$ 13,390	$ 10,051	$ 13,390	$ 11,534
Number of loans | loan	12	15	12	15
TDR recorded investment more than 30 days past due	$ 1,095	$ 2,814	$ 1,095	$ 2,814
Number of loans placed on TDR status in previous 12 months | loan			2	2
Number of loans | loan	0	1	3	3
Number of TDR loans involved in bankruptcy (loan) | loan	8		8
Loans classified as TDRs that are involved in bankruptcy	$ 961		$ 961
Number of loans classified as TDRs that were on non-accrual status | loan	19		19
Loans classified as TDRs that were on non-accrual status	$ 1,648		$ 1,648
Number of loans classified as TDRs that are involved in foreclosure | loan	0		0
Number of mortgage loans in the process of foreclosure | loan	10	17	10	17
Mortgage loans in the process of foreclosure	$ 839	$ 2,083	$ 839	$ 2,083
Small Business Administration (SBA), CARES Act, Excluding Paycheck Protection Program
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of loans | loan_modification_request			1,051
Loans	$ 287,922		$ 287,922
Percentage of loans receivable, by type	18.30%		18.30%
Unallocated
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 0	$ 0	$ 0	$ 0	$ 0
Number of days past due			30 days	30 days
Exemption from Troubled Debt Restructure Designation, CARES Act | Original or Subsequent Modification
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 6,609		$ 6,609
Percentage of loans receivable, by type	0.41%		0.41%

Loans - Past-due Status of Loan

Loans - Past-due Status of Loans by Class (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020	Sep. 30, 2020
Schedule of Financing Receivables [Line Items]
Loans	$ 1,617,212	$ 1,476,761	$ 1,436,646
90+ Days & Accruing	229	1,505	1,494
30-59 Days Past Due
Schedule of Financing Receivables [Line Items]
Loans	1,028	2,916	6,581
60-89 Days Past Due
Schedule of Financing Receivables [Line Items]
Loans	1,519	2,417	766
90+ Days Past Due
Schedule of Financing Receivables [Line Items]
Loans	1,571	4,389	5,429
All Past Due
Schedule of Financing Receivables [Line Items]
Loans	4,118	9,722	12,776
Current
Schedule of Financing Receivables [Line Items]
Loans	1,613,094	1,467,039	1,423,870
Commercial |    Real estate
Schedule of Financing Receivables [Line Items]
Loans	550,077	442,121	407,128
90+ Days & Accruing	36	0	0
Commercial |    Real estate | 30-59 Days Past Due
Schedule of Financing Receivables [Line Items]
Loans	33	139	2,397
Commercial |    Real estate | 60-89 Days Past Due
Schedule of Financing Receivables [Line Items]
Loans	0	190	58
Commercial |    Real estate | 90+ Days Past Due
Schedule of Financing Receivables [Line Items]
Loans	226	226	454
Commercial |    Real estate | All Past Due
Schedule of Financing Receivables [Line Items]
Loans	259	555	2,909
Commercial |    Real estate | Current
Schedule of Financing Receivables [Line Items]
Loans	549,818	441,566	404,219
Commercial |    Construction
Schedule of Financing Receivables [Line Items]
Loans	73,302	56,565	52,038
90+ Days & Accruing	0	0	0
Commercial |    Construction | 30-59 Days Past Due
Schedule of Financing Receivables [Line Items]
Loans	13	13	0
Commercial |    Construction | 60-89 Days Past Due
Schedule of Financing Receivables [Line Items]
Loans	15	0	0
Commercial |    Construction | 90+ Days Past Due
Schedule of Financing Receivables [Line Items]
Loans	0	80	80
Commercial |    Construction | All Past Due
Schedule of Financing Receivables [Line Items]
Loans	28	93	80
Commercial |    Construction | Current
Schedule of Financing Receivables [Line Items]
Loans	73,274	56,472	51,958
Commercial |    Other
Schedule of Financing Receivables [Line Items]
Loans	288,121	285,015	309,297
90+ Days & Accruing	0	1,464	1,464
Commercial |    Other | 30-59 Days Past Due
Schedule of Financing Receivables [Line Items]
Loans	92	490	547
Commercial |    Other | 60-89 Days Past Due
Schedule of Financing Receivables [Line Items]
Loans	359	62	258
Commercial |    Other | 90+ Days Past Due
Schedule of Financing Receivables [Line Items]
Loans	225	2,082	1,871
Commercial |    Other | All Past Due
Schedule of Financing Receivables [Line Items]
Loans	676	2,634	2,676
Commercial |    Other | Current
Schedule of Financing Receivables [Line Items]
Loans	287,445	282,381	306,621
Municipal
Schedule of Financing Receivables [Line Items]
Loans	40,616	43,783	44,110
90+ Days & Accruing	0	0	0
Municipal | 30-59 Days Past Due
Schedule of Financing Receivables [Line Items]
Loans	0	0	0
Municipal | 60-89 Days Past Due
Schedule of Financing Receivables [Line Items]
Loans	0	0	0
Municipal | 90+ Days Past Due
Schedule of Financing Receivables [Line Items]
Loans	0	0	0
Municipal | All Past Due
Schedule of Financing Receivables [Line Items]
Loans	0	0	0
Municipal | Current
Schedule of Financing Receivables [Line Items]
Loans	40,616	43,783	44,110
Residential |    Construction
Schedule of Financing Receivables [Line Items]
Loans	29,358	21,600	16,101
90+ Days & Accruing	0	0	0
Residential |    Construction | 30-59 Days Past Due
Schedule of Financing Receivables [Line Items]
Loans	0	0	0
Residential |    Construction | 60-89 Days Past Due
Schedule of Financing Receivables [Line Items]
Loans	0	0	0
Residential |    Construction | 90+ Days Past Due
Schedule of Financing Receivables [Line Items]
Loans	0	0	0
Residential |    Construction | All Past Due
Schedule of Financing Receivables [Line Items]
Loans	0	0	0
Residential |    Construction | Current
Schedule of Financing Receivables [Line Items]
Loans	29,358	21,600	16,101
Residential |    Term
Schedule of Financing Receivables [Line Items]
Loans	537,811	522,070	497,667
90+ Days & Accruing	190	23	0
Residential |    Term | 30-59 Days Past Due
Schedule of Financing Receivables [Line Items]
Loans	549	540	2,550
Residential |    Term | 60-89 Days Past Due
Schedule of Financing Receivables [Line Items]
Loans	918	1,799	357
Residential |    Term | 90+ Days Past Due
Schedule of Financing Receivables [Line Items]
Loans	986	1,616	1,602
Residential |    Term | All Past Due
Schedule of Financing Receivables [Line Items]
Loans	2,453	3,955	4,509
Residential |    Term | Current
Schedule of Financing Receivables [Line Items]
Loans	535,358	518,115	493,158
Home equity line of credit
Schedule of Financing Receivables [Line Items]
Loans	74,594	79,750	82,982
90+ Days & Accruing	0	0	0
Home equity line of credit | 30-59 Days Past Due
Schedule of Financing Receivables [Line Items]
Loans	251	1,645	868
Home equity line of credit | 60-89 Days Past Due
Schedule of Financing Receivables [Line Items]
Loans	25	324	65
Home equity line of credit | 90+ Days Past Due
Schedule of Financing Receivables [Line Items]
Loans	131	367	1,392
Home equity line of credit | All Past Due
Schedule of Financing Receivables [Line Items]
Loans	407	2,336	2,325
Home equity line of credit | Current
Schedule of Financing Receivables [Line Items]
Loans	74,187	77,414	80,657
Consumer
Schedule of Financing Receivables [Line Items]
Loans	23,333	25,857	27,323
90+ Days & Accruing	3	18	30
Consumer | 30-59 Days Past Due
Schedule of Financing Receivables [Line Items]
Loans	90	89	219
Consumer | 60-89 Days Past Due
Schedule of Financing Receivables [Line Items]
Loans	202	42	28
Consumer | 90+ Days Past Due
Schedule of Financing Receivables [Line Items]
Loans	3	18	30
Consumer | All Past Due
Schedule of Financing Receivables [Line Items]
Loans	295	149	277
Consumer | Current
Schedule of Financing Receivables [Line Items]
Loans	$ 23,038	$ 25,708	$ 27,046

Loans - Modification Statuses b

Loans - Modification Statuses by Portfolio Segment (Details) $ in Thousands	9 Months Ended		12 Months Ended
	Sep. 30, 2021USD ($)loan	Sep. 30, 2020USD ($)loan	Dec. 31, 2020USD ($)loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Units | loan	64	78	74
Percentage of loans receivable, by type	100.00%	100.00%	100.00%
Balance | $	$ 1,617,212	$ 1,436,646	$ 1,476,761
Commercial/Municipal Loan Modifications | Exemption from Troubled Debt Restructure Designation, CARES Act
Accounts, Notes, Loans and Financing Receivable [Line Items]
Units | loan	605
Percentage of loans receivable, by type	100.00%
Balance | $	$ 234,334
Percentage of balance	100.00%
Commercial/Municipal Loan Modifications | Paid Off | Exemption from Troubled Debt Restructure Designation, CARES Act
Accounts, Notes, Loans and Financing Receivable [Line Items]
Units | loan	156
Percentage of loans receivable, by type	26.00%
Balance | $	$ 35,130
Percentage of balance	15.00%
Commercial/Municipal Loan Modifications | Charged Off | Exemption from Troubled Debt Restructure Designation, CARES Act
Accounts, Notes, Loans and Financing Receivable [Line Items]
Units | loan	1
Percentage of loans receivable, by type	0.00%
Balance | $	$ 66
Percentage of balance	0.00%
Commercial/Municipal Loan Modifications | Subsequent Modification | Exemption from Troubled Debt Restructure Designation, CARES Act
Accounts, Notes, Loans and Financing Receivable [Line Items]
Units | loan	2
Percentage of loans receivable, by type	0.00%
Balance | $	$ 1,014
Percentage of balance	0.00%
Commercial/Municipal Loan Modifications | Still in Original Modification | Exemption from Troubled Debt Restructure Designation, CARES Act
Accounts, Notes, Loans and Financing Receivable [Line Items]
Units | loan	1
Percentage of loans receivable, by type	0.00%
Balance | $	$ 125
Percentage of balance	0.00%
Commercial/Municipal Loan Modifications | Out of Modification | Exemption from Troubled Debt Restructure Designation, CARES Act
Accounts, Notes, Loans and Financing Receivable [Line Items]
Units | loan	445
Percentage of loans receivable, by type	74.00%
Balance | $	$ 197,999
Percentage of balance	85.00%
Residential Real Estate Modifications | Exemption from Troubled Debt Restructure Designation, CARES Act
Accounts, Notes, Loans and Financing Receivable [Line Items]
Units | loan	377
Percentage of loans receivable, by type	100.00%
Balance | $	$ 52,578
Percentage of balance	100.00%
Residential Real Estate Modifications | Paid Off | Exemption from Troubled Debt Restructure Designation, CARES Act
Accounts, Notes, Loans and Financing Receivable [Line Items]
Units | loan	73
Percentage of loans receivable, by type	20.00%
Balance | $	$ 12,694
Percentage of balance	24.00%
Residential Real Estate Modifications | Subsequent Modification | Exemption from Troubled Debt Restructure Designation, CARES Act
Accounts, Notes, Loans and Financing Receivable [Line Items]
Units | loan	53
Percentage of loans receivable, by type	14.00%
Balance | $	$ 5,405
Percentage of balance	10.00%
Residential Real Estate Modifications | Still in Original Modification | Exemption from Troubled Debt Restructure Designation, CARES Act
Accounts, Notes, Loans and Financing Receivable [Line Items]
Units | loan	1
Percentage of loans receivable, by type	0.00%
Balance | $	$ 22
Percentage of balance	0.00%
Residential Real Estate Modifications | Out of Modification | Exemption from Troubled Debt Restructure Designation, CARES Act
Accounts, Notes, Loans and Financing Receivable [Line Items]
Units | loan	250
Percentage of loans receivable, by type	66.00%
Balance | $	$ 34,457
Percentage of balance	66.00%
Consumer Loan Modifications
Accounts, Notes, Loans and Financing Receivable [Line Items]
Units | loan	1	1	1
Percentage of loans receivable, by type	1.40%	1.90%	1.80%
Balance | $	$ 23,333	$ 27,323	$ 25,857
Consumer Loan Modifications | Exemption from Troubled Debt Restructure Designation, CARES Act
Accounts, Notes, Loans and Financing Receivable [Line Items]
Units | loan	69
Percentage of loans receivable, by type	100.00%
Balance | $	$ 1,010
Percentage of balance	100.00%
Consumer Loan Modifications | Paid Off | Exemption from Troubled Debt Restructure Designation, CARES Act
Accounts, Notes, Loans and Financing Receivable [Line Items]
Units | loan	23
Percentage of loans receivable, by type	34.00%
Balance | $	$ 209
Percentage of balance	21.00%
Consumer Loan Modifications | Charged Off | Exemption from Troubled Debt Restructure Designation, CARES Act
Accounts, Notes, Loans and Financing Receivable [Line Items]
Units | loan	1
Percentage of loans receivable, by type	1.00%
Balance | $	$ 10
Percentage of balance	1.00%
Consumer Loan Modifications | Subsequent Modification | Exemption from Troubled Debt Restructure Designation, CARES Act
Accounts, Notes, Loans and Financing Receivable [Line Items]
Units | loan	2
Percentage of loans receivable, by type	3.00%
Balance | $	$ 43
Percentage of balance	4.00%
Consumer Loan Modifications | Out of Modification | Exemption from Troubled Debt Restructure Designation, CARES Act
Accounts, Notes, Loans and Financing Receivable [Line Items]
Units | loan	43
Percentage of loans receivable, by type	62.00%
Balance | $	$ 748
Percentage of balance	74.00%

Loans - Nonaccrual Loans (Detai

Loans - Nonaccrual Loans (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020	Sep. 30, 2020
Schedule of Financing Receivables [Line Items]
Nonaccrual loans	$ 6,145	$ 6,721	$ 9,111
Commercial |    Real estate
Schedule of Financing Receivables [Line Items]
Nonaccrual loans	604	543	1,771
Commercial |    Construction
Schedule of Financing Receivables [Line Items]
Nonaccrual loans	23	89	307
Commercial |    Other
Schedule of Financing Receivables [Line Items]
Nonaccrual loans	1,251	1,481	503
Municipal
Schedule of Financing Receivables [Line Items]
Nonaccrual loans	0	0	0
Residential |    Construction
Schedule of Financing Receivables [Line Items]
Nonaccrual loans	0	0	0
Residential |    Term
Schedule of Financing Receivables [Line Items]
Nonaccrual loans	3,785	3,593	4,467
Home equity line of credit
Schedule of Financing Receivables [Line Items]
Nonaccrual loans	482	1,015	2,063
Consumer
Schedule of Financing Receivables [Line Items]
Nonaccrual loans	$ 0	$ 0	$ 0

Loans - Impaired Loans by Class

Loans - Impaired Loans by Class (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Impaired Financing Receivable, Recorded Investment [Abstract]
Recorded investment, with no related allowance	$ 10,790	$ 14,161	$ 10,790	$ 14,161	$ 12,098
Recorded investment, with related allowance	3,759	5,180	3,759	5,180	3,941
Recorded Investment	14,549	19,341	14,549	19,341	16,039
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]
Unpaid principal balance, with no related allowance	12,442	16,361	12,442	16,361	13,806
Unpaid principal balance with related allowance	3,969	5,293	3,969	5,293	4,036
Unpaid Principal Balance	16,411	21,654	16,411	21,654	17,842
Related Allowance	682	890	682	890	462
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Average recorded investment, with no related allowance	11,179	14,600	11,789	16,328	15,473
Average recorded investment, with related allowance	3,659	4,951	3,856	6,094	5,615
Average Recorded Investment	14,838	19,551	15,645	22,422	21,088
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract]
Recognized interest income, with no related allowance	52	72	163	269	336
Recognized interest income, with related allowance	30	47	89	121	142
Recognized Interest Income	82	119	252	390	478
Commercial |    Real estate
Impaired Financing Receivable, Recorded Investment [Abstract]
Recorded investment, with no related allowance	1,906	3,730	1,906	3,730	2,060
Recorded investment, with related allowance	894	1,023	894	1,023	969
Recorded Investment	2,800	4,753	2,800	4,753	3,029
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]
Unpaid principal balance, with no related allowance	2,257	4,528	2,257	4,528	2,368
Unpaid principal balance with related allowance	923	1,047	923	1,047	995
Unpaid Principal Balance	3,180	5,575	3,180	5,575	3,363
Related Allowance	138	135	138	135	112
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Average recorded investment, with no related allowance	2,053	4,068	2,215	4,673	4,123
Average recorded investment, with related allowance	910	1,027	940	1,032	1,018
Average Recorded Investment	2,963	5,095	3,155	5,705	5,141
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract]
Recognized interest income, with no related allowance	15	33	50	117	127
Recognized interest income, with related allowance	10	11	30	32	43
Recognized Interest Income	25	44	80	149	170
Commercial |    Construction
Impaired Financing Receivable, Recorded Investment [Abstract]
Recorded investment, with no related allowance	24	308	24	308	89
Recorded investment, with related allowance	681	701	681	701	681
Recorded Investment	705	1,009	705	1,009	770
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]
Unpaid principal balance, with no related allowance	25	337	25	337	89
Unpaid principal balance with related allowance	681	701	681	701	681
Unpaid Principal Balance	706	1,038	706	1,038	770
Related Allowance	18	19	18	19	18
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Average recorded investment, with no related allowance	24	256	69	402	358
Average recorded investment, with related allowance	681	701	681	546	579
Average Recorded Investment	705	957	750	948	937
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract]
Recognized interest income, with no related allowance	0	0	0	0	0
Recognized interest income, with related allowance	6	8	17	25	30
Recognized Interest Income	6	8	17	25	30
Commercial |    Other
Impaired Financing Receivable, Recorded Investment [Abstract]
Recorded investment, with no related allowance	1,353	862	1,353	862	1,591
Recorded investment, with related allowance	402	161	402	161	188
Recorded Investment	1,755	1,023	1,755	1,023	1,779
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]
Unpaid principal balance, with no related allowance	1,459	887	1,459	887	1,623
Unpaid principal balance with related allowance	421	183	421	183	202
Unpaid Principal Balance	1,880	1,070	1,880	1,070	1,825
Related Allowance	397	128	397	128	169
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Average recorded investment, with no related allowance	1,372	814	1,534	796	999
Average recorded investment, with related allowance	403	143	466	1,523	1,193
Average Recorded Investment	1,775	957	2,000	2,319	2,192
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract]
Recognized interest income, with no related allowance	4	6	12	19	15
Recognized interest income, with related allowance	5	0	10	0	3
Recognized Interest Income	9	6	22	19	18
Municipal
Impaired Financing Receivable, Recorded Investment [Abstract]
Recorded investment, with no related allowance	0	0	0	0	0
Recorded investment, with related allowance	0	0	0	0	0
Recorded Investment	0	0	0	0	0
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]
Unpaid principal balance, with no related allowance	0	0	0	0	0
Unpaid principal balance with related allowance	0	0	0	0	0
Unpaid Principal Balance	0	0	0	0	0
Related Allowance	0	0	0	0	0
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Average recorded investment, with no related allowance	0	0	0	0	0
Average recorded investment, with related allowance	0	0	0	0	0
Average Recorded Investment	0	0	0	0	0
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract]
Recognized interest income, with no related allowance	0	0	0	0	0
Recognized interest income, with related allowance	0	0	0	0	0
Recognized Interest Income	0	0	0	0	0
Residential |    Construction
Impaired Financing Receivable, Recorded Investment [Abstract]
Recorded investment, with no related allowance	0	0	0	0	0
Recorded investment, with related allowance	0	0	0	0	0
Recorded Investment	0	0	0	0	0
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]
Unpaid principal balance, with no related allowance	0	0	0	0	0
Unpaid principal balance with related allowance	0	0	0	0	0
Unpaid Principal Balance	0	0	0	0	0
Related Allowance	0	0	0	0	0
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Average recorded investment, with no related allowance	0	0	9	0	0
Average recorded investment, with related allowance	0	0	0	0	0
Average Recorded Investment	0	0	9	0	0
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract]
Recognized interest income, with no related allowance	0	0	0	0	0
Recognized interest income, with related allowance	0	0	0	0	0
Recognized Interest Income	0	0	0	0	0
Residential |    Term
Impaired Financing Receivable, Recorded Investment [Abstract]
Recorded investment, with no related allowance	7,021	7,783	7,021	7,783	7,335
Recorded investment, with related allowance	1,761	2,399	1,761	2,399	2,079
Recorded Investment	8,782	10,182	8,782	10,182	9,414
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]
Unpaid principal balance, with no related allowance	8,181	9,058	8,181	9,058	8,629
Unpaid principal balance with related allowance	1,923	2,466	1,923	2,466	2,134
Unpaid Principal Balance	10,104	11,524	10,104	11,524	10,763
Related Allowance	129	204	129	204	163
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Average recorded investment, with no related allowance	7,180	8,024	7,231	9,173	8,773
Average recorded investment, with related allowance	1,641	2,207	1,753	2,002	2,073
Average Recorded Investment	8,821	10,231	8,984	11,175	10,846
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract]
Recognized interest income, with no related allowance	33	31	101	123	193
Recognized interest income, with related allowance	9	27	32	63	65
Recognized Interest Income	42	58	133	186	258
Home equity line of credit
Impaired Financing Receivable, Recorded Investment [Abstract]
Recorded investment, with no related allowance	482	1,478	482	1,478	1,015
Recorded investment, with related allowance	21	886	21	886	24
Recorded Investment	503	2,364	503	2,364	1,039
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]
Unpaid principal balance, with no related allowance	516	1,551	516	1,551	1,089
Unpaid principal balance with related allowance	21	886	21	886	24
Unpaid Principal Balance	537	2,437	537	2,437	1,113
Related Allowance	0	403	0	403	0
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Average recorded investment, with no related allowance	546	1,438	725	1,284	1,219
Average recorded investment, with related allowance	21	870	15	981	744
Average Recorded Investment	567	2,308	740	2,265	1,963
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract]
Recognized interest income, with no related allowance	0	2	0	10	0
Recognized interest income, with related allowance	0	1	0	1	1
Recognized Interest Income	0	3	0	11	1
Consumer
Impaired Financing Receivable, Recorded Investment [Abstract]
Recorded investment, with no related allowance	4	0	4	0	8
Recorded investment, with related allowance	0	10	0	10	0
Recorded Investment	4	10	4	10	8
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]
Unpaid principal balance, with no related allowance	4	0	4	0	8
Unpaid principal balance with related allowance	0	10	0	10	0
Unpaid Principal Balance	4	10	4	10	8
Related Allowance	0	1	0	1	0
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Average recorded investment, with no related allowance	4	0	6	0	1
Average recorded investment, with related allowance	3	3	1	10	8
Average Recorded Investment	7	3	7	10	9
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract]
Recognized interest income, with no related allowance	0	0	0	0	1
Recognized interest income, with related allowance	0	0	0	0	0
Recognized Interest Income	$ 0	$ 0	$ 0	$ 0	$ 1

Loans - TDR's by Class and Spec

Loans - TDR's by Class and Specific Reserves (Details) $ in Thousands	9 Months Ended		12 Months Ended
	Sep. 30, 2021USD ($)loan	Sep. 30, 2020USD ($)loan	Dec. 31, 2020USD ($)loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | loan	64	78	74
Balance	$ 10,051	$ 13,390	$ 11,534
Specific Reserves	$ 636	$ 395	$ 369
Commercial |    Real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | loan	10	16	13
Balance	$ 2,238	$ 4,054	$ 2,558
Specific Reserves	$ 138	$ 130	$ 106
Commercial |    Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | loan	1	1	1
Balance	$ 681	$ 701	$ 681
Specific Reserves	$ 18	$ 19	$ 18
Commercial |    Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | loan	6	6	6
Balance	$ 883	$ 729	$ 717
Specific Reserves	$ 351	$ 92	$ 96
Municipal
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | loan	0	0	0
Balance	$ 0	$ 0	$ 0
Specific Reserves	$ 0	$ 0	$ 0
Residential |    Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | loan	0	0	0
Balance	$ 0	$ 0	$ 0
Specific Reserves	$ 0	$ 0	$ 0
Residential |    Term
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | loan	45	51	51
Balance	$ 6,224	$ 7,430	$ 7,384
Specific Reserves	$ 129	$ 153	$ 149
Home equity line of credit
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | loan	1	3	2
Balance	$ 21	$ 466	$ 186
Specific Reserves	$ 0	$ 0	$ 0
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | loan	1	1	1
Balance	$ 4	$ 10	$ 8
Specific Reserves	$ 0	$ 1	$ 0

Loans - TDR's by Class and Sp_2

Loans - TDR's by Class and Specific Reserves More Than 30 Days Past Due (Details) $ in Thousands	Sep. 30, 2021USD ($)loan	Sep. 30, 2020USD ($)loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | loan	12	15
Balance	$ 1,095	$ 2,814
Specific Reserves	$ 351	$ 93
Commercial |    Real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | loan	0	3
Balance	$ 0	$ 1,472
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
Commercial |    Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | loan	5	4
Balance	$ 641	$ 424
Specific Reserves	$ 351	$ 92
Municipal
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | loan	0	0
Balance	$ 0	$ 0
Specific Reserves	$ 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	6	6
Balance	$ 450	$ 743
Specific Reserves	$ 0	$ 0
Home equity line of credit
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | loan	0	1
Balance	$ 0	$ 165
Specific Reserves	$ 0	$ 0
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | loan	1	1
Balance	$ 4	$ 10
Specific Reserves	$ 0	$ 1

Loans - Pre-Modification and Po

Loans - Pre-Modification and Post-Modification Outstanding Recorded Investment (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021loan	Sep. 30, 2020USD ($)loan	Sep. 30, 2021USD ($)loan	Sep. 30, 2020USD ($)loan
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan	0	1	3	3
Pre-Modification Outstanding Recorded Investment		$ 10	$ 350	$ 245
Post-Modification Outstanding Recorded Investment		10	345	197
Specific Reserves		$ 1	$ 261	$ 24
Commercial |    Real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan		0	0	0
Pre-Modification Outstanding Recorded Investment		$ 0	$ 0	$ 0
Post-Modification Outstanding Recorded Investment		0	0	0
Specific Reserves		$ 0	$ 0	$ 0
Commercial |    Construction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan		0	1	0
Pre-Modification Outstanding Recorded Investment		$ 0	$ 80	$ 0
Post-Modification Outstanding Recorded Investment		0	80	0
Specific Reserves		$ 0	$ 0	$ 0
Commercial |    Other
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan		0	1	0
Pre-Modification Outstanding Recorded Investment		$ 0	$ 261	$ 0
Post-Modification Outstanding Recorded Investment		0	261	0
Specific Reserves		$ 0	$ 261	$ 0
Municipal
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan		0	0	0
Pre-Modification Outstanding Recorded Investment		$ 0	$ 0	$ 0
Post-Modification Outstanding Recorded Investment		0	0	0
Specific Reserves		$ 0	$ 0	$ 0
Residential |    Construction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan		0	0	0
Pre-Modification Outstanding Recorded Investment		$ 0	$ 0	$ 0
Post-Modification Outstanding Recorded Investment		0	0	0
Specific Reserves		$ 0	$ 0	$ 0
Residential |    Term
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan		0	1	2
Pre-Modification Outstanding Recorded Investment		$ 0	$ 9	$ 235
Post-Modification Outstanding Recorded Investment		0	4	187
Specific Reserves		$ 0	$ 0	$ 23
Home equity line of credit
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan		0	0	0
Pre-Modification Outstanding Recorded Investment		$ 0	$ 0	$ 0
Post-Modification Outstanding Recorded Investment		0	0	0
Specific Reserves			$ 0	$ 0
Consumer
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan		1	0	1
Pre-Modification Outstanding Recorded Investment		$ 10	$ 0	$ 10
Post-Modification Outstanding Recorded Investment		10	0	10
Specific Reserves		$ 1	$ 0	$ 1

Allowance for Loan Losses - Nar

Allowance for Loan Losses - Narrative (Details) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2021USD ($)loan_class	Dec. 31, 2020USD ($)	Jun. 30, 2021USD ($)	Sep. 30, 2020USD ($)	Jun. 30, 2020USD ($)	Dec. 31, 2019USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of loan classes | loan_class	8
Percent of related loans	0.82%	0.80%
Increase (decrease) in qualitative portion	$ 1,539
Allowance for loan losses	$ 17,507	$ 16,253	$ 17,034	$ 15,371	$ 14,110	$ 11,639
Allowance for loan losses as a percent of total loans	1.08%	1.10%		1.07%
Number of classes in the commercial loan portfolio | loan_class	3
Loan-to-value percent, commercial real estate	80.00%
Number of classes in the residential loan portfolio | loan_class	2
Construction loans, percent of capital	45.40%
Construction loans, maximum percent of capital	100.00%
Construction loans and non-owner-occupied commercial real estate loans, percent of capital	191.70%
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%
Minimum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Residential loans, loan to value percent, maximum	75.00%
Consumer loans, loan to value percent, minimum	80.00%
Maximum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Residential loans, loan to value percent, maximum	80.00%
Consumer loans, loan to value percent, minimum	90.00%
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	$ 867	$ 778	892	$ 592	658	867
Delinquent period before consumer loans are charged off	120 days
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	$ 142	102	160	81	64	25
Loan maturities	1 year
Home equity line of credit
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	$ 956	1,211	959	1,457	1,284	1,078
Loan maturities	300 months
Loan to value ratio	0.80
Commercial |    Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	$ 879	662	$ 750	607	$ 524	$ 365
Loan maturities	2 years
Unallocated Reserves
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	$ 1,487	$ 2,134		1,576
Percent of total allowance reserve	8.50%	13.10%
Unallocated Reserves | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	$ 0	$ 0		0
Unallocated Reserves | Residential |    Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	0	0		0
Unallocated Reserves | Home equity line of credit
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	0	0		0
Unallocated Reserves | Commercial |    Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	$ 0	$ 0		$ 0

Allowance for Loan Losses - Fin

Allowance for Loan Losses - Financing Receivable and Allowance Element by Class (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Jun. 30, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	$ 17,507	$ 17,034	$ 16,253	$ 15,371	$ 14,110	$ 11,639
Specific Reserves on Loans Evaluated Individually for Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	682		462	890
General Reserves on Loans Based on Historical Loss Experience
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	2,004		1,862	1,826
Reserves for Qualitative Factors
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	13,334		11,795	11,079
Unallocated Reserves
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	1,487		2,134	1,576
Commercial |    Real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	6,499	6,088	5,178	4,761	4,511	3,742
Commercial |    Real estate | Specific Reserves on Loans Evaluated Individually for Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	138		112	135
Commercial |    Real estate | General Reserves on Loans Based on Historical Loss Experience
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	864		721	686
Commercial |    Real estate | Reserves for Qualitative Factors
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	5,497		4,345	3,940
Commercial |    Real estate | Unallocated Reserves
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	0		0	0
Commercial |    Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	879	750	662	607	524	365
Commercial |    Construction | Specific Reserves on Loans Evaluated Individually for Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	18		18	19
Commercial |    Construction | General Reserves on Loans Based on Historical Loss Experience
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	117		92	87
Commercial |    Construction | Reserves for Qualitative Factors
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	744		552	501
Commercial |    Construction | Unallocated Reserves
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	0		0	0
Commercial |    Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	3,727	3,757	3,438	3,642	3,689	3,329
Commercial |    Other | Specific Reserves on Loans Evaluated Individually for Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	397		169	128
Commercial |    Other | General Reserves on Loans Based on Historical Loss Experience
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	452		465	521
Commercial |    Other | Reserves for Qualitative Factors
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	2,878		2,804	2,993
Commercial |    Other | Unallocated Reserves
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	0		0	0
Municipal
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	189	187	171	139	110	27
Municipal | Specific Reserves on Loans Evaluated Individually for Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	0		0	0
Municipal | General Reserves on Loans Based on Historical Loss Experience
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	0		0	0
Municipal | Reserves for Qualitative Factors
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	189		171	139
Municipal | Unallocated Reserves
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	0		0	0
Residential |    Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	142	160	102	81	64	25
Residential |    Construction | Specific Reserves on Loans Evaluated Individually for Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	0		0	0
Residential |    Construction | General Reserves on Loans Based on Historical Loss Experience
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	10		6	10
Residential |    Construction | Reserves for Qualitative Factors
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	132		96	71
Residential |    Construction | Unallocated Reserves
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	0		0	0
Residential |    Term
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	2,761	2,896	2,579	2,516	2,261	1,024
Residential |    Term | Specific Reserves on Loans Evaluated Individually for Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	129		163	204
Residential |    Term | General Reserves on Loans Based on Historical Loss Experience
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	189		145	275
Residential |    Term | Reserves for Qualitative Factors
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	2,443		2,271	2,037
Residential |    Term | Unallocated Reserves
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	0		0	0
Home equity line of credit
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	956	959	1,211	1,457	1,284	1,078
Home equity line of credit | Specific Reserves on Loans Evaluated Individually for Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	0		0	403
Home equity line of credit | General Reserves on Loans Based on Historical Loss Experience
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	109		151	79
Home equity line of credit | Reserves for Qualitative Factors
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	847		1,060	975
Home equity line of credit | Unallocated Reserves
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	0		0	0
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	867	892	778	592	658	867
Consumer | Specific Reserves on Loans Evaluated Individually for Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	0		0	1
Consumer | General Reserves on Loans Based on Historical Loss Experience
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	263		282	168
Consumer | Reserves for Qualitative Factors
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	604		496	423
Consumer | Unallocated Reserves
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	0		0	0
Unallocated
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	1,487	$ 1,345	2,134	1,576	$ 1,009	$ 1,182
Unallocated | Specific Reserves on Loans Evaluated Individually for Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	0		0	0
Unallocated | General Reserves on Loans Based on Historical Loss Experience
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	0		0	0
Unallocated | Reserves for Qualitative Factors
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	0		0	0
Unallocated | Unallocated Reserves
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	$ 1,487		$ 2,134	$ 1,576

Allowance for Loan Losses - Ris

Allowance for Loan Losses - Risk Ratings by Segment (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020	Sep. 30, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	$ 952,116	$ 827,484	$ 812,573
1 Strong
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	2,442	2,421	2,274
2 Above Average
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	55,326	56,546	57,742
3 Satisfactory
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	174,474	199,165	228,052
4 Average
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	558,911	414,786	367,869
5 Watch
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	142,683	137,026	133,695
6 OAEM
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	3,931	2,988	3,319
7 Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	14,349	14,552	19,622
8 Doubtful
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	0	0	0
Commercial |    Real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	550,077	442,121	407,128
Commercial |    Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	73,302	56,565	52,038
Commercial |    Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	288,121	285,015	309,297
Commercial | 1 Strong |    Real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	0	0	0
Commercial | 1 Strong |    Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	0	0	0
Commercial | 1 Strong |    Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	2,434	2,402	2,251
Commercial | 2 Above Average |    Real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	9,220	5,938	8,492
Commercial | 2 Above Average |    Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	175	2,343	1,627
Commercial | 2 Above Average |    Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	7,144	6,326	5,361
Commercial | 3 Satisfactory |    Real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	92,596	91,475	84,178
Commercial | 3 Satisfactory |    Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	1,831	2,889	3,145
Commercial | 3 Satisfactory |    Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	79,693	104,432	140,360
Commercial | 4 Average |    Real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	355,252	261,539	230,954
Commercial | 4 Average |    Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	47,003	31,221	27,907
Commercial | 4 Average |    Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	155,189	120,570	107,552
Commercial | 5 Watch |    Real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	79,885	72,840	68,565
Commercial | 5 Watch |    Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	24,293	19,893	18,919
Commercial | 5 Watch |    Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	38,505	44,293	46,211
Commercial | 6 OAEM |    Real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	3,899	2,754	2,028
Commercial | 6 OAEM |    Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	0	0	0
Commercial | 6 OAEM |    Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	32	234	1,291
Commercial | 7 Substandard |    Real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	9,225	7,575	12,911
Commercial | 7 Substandard |    Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	0	219	440
Commercial | 7 Substandard |    Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	5,124	6,758	6,271
Commercial | 8 Doubtful |    Real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	0	0	0
Commercial | 8 Doubtful |    Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	0	0	0
Commercial | 8 Doubtful |    Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	0	0	0
Municipal
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	40,616	43,783	44,110
Municipal | 1 Strong
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	8	19	23
Municipal | 2 Above Average
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	38,787	41,939	42,262
Municipal | 3 Satisfactory
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	354	369	369
Municipal | 4 Average
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	1,467	1,456	1,456
Municipal | 5 Watch
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	0	0	0
Municipal | 6 OAEM
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	0	0	0
Municipal | 7 Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	0	0	0
Municipal | 8 Doubtful
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	$ 0	$ 0	$ 0

Allowance for Loan Losses - Act

Allowance for Loan Losses - Activity by Class (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	$ 17,034	$ 14,110	$ 16,253	$ 11,639	$ 11,639
Charge offs	158	576	637	993	1,661
Recoveries	106	37	316	175	225
Provision (credit)	525	1,800	1,575	4,550	6,050
Ending balance	17,507	15,371	17,507	15,371	16,253
Ending balance specifically evaluated for impairment	682	890	682	890	462
Ending balance collectively evaluated for impairment	16,825	14,481	16,825	14,481	15,791
Ending balance	1,617,212	1,436,646	1,617,212	1,436,646	1,476,761
Ending balance specifically evaluated for impairment	14,549	19,341	14,549	19,341	16,039
Ending balance collectively evaluated for impairment	1,602,663	1,417,305	1,602,663	1,417,305	1,460,722
Commercial |    Real estate
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	6,088	4,511	5,178	3,742	3,742
Charge offs	66	532	71	532	1,088
Recoveries	0	0	95	0	0
Provision (credit)	477	782	1,297	1,551	2,524
Ending balance	6,499	4,761	6,499	4,761	5,178
Ending balance specifically evaluated for impairment	138	135	138	135	112
Ending balance collectively evaluated for impairment	6,361	4,626	6,361	4,626	5,066
Ending balance	550,077	407,128	550,077	407,128	442,121
Ending balance specifically evaluated for impairment	2,800	4,753	2,800	4,753	3,029
Ending balance collectively evaluated for impairment	547,277	402,375	547,277	402,375	439,092
Commercial |    Construction
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	750	524	662	365	365
Charge offs	0	0	0	0	0
Recoveries	0	0	0	0	0
Provision (credit)	129	83	217	242	297
Ending balance	879	607	879	607	662
Ending balance specifically evaluated for impairment	18	19	18	19	18
Ending balance collectively evaluated for impairment	861	588	861	588	644
Ending balance	73,302	52,038	73,302	52,038	56,565
Ending balance specifically evaluated for impairment	705	1,009	705	1,009	770
Ending balance collectively evaluated for impairment	72,597	51,029	72,597	51,029	55,795
Commercial |    Other
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	3,757	3,689	3,438	3,329	3,329
Charge offs	0	7	286	24	27
Recoveries	81	4	83	24	37
Provision (credit)	(111)	(44)	492	313	99
Ending balance	3,727	3,642	3,727	3,642	3,438
Ending balance specifically evaluated for impairment	397	128	397	128	169
Ending balance collectively evaluated for impairment	3,330	3,514	3,330	3,514	3,269
Ending balance	288,121	309,297	288,121	309,297	285,015
Ending balance specifically evaluated for impairment	1,755	1,023	1,755	1,023	1,779
Ending balance collectively evaluated for impairment	286,366	308,274	286,366	308,274	283,236
Municipal
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	187	110	171	27	27
Charge offs	0	0	0	0	0
Recoveries	0	0	0	0	0
Provision (credit)	2	29	18	112	144
Ending balance	189	139	189	139	171
Ending balance specifically evaluated for impairment	0	0	0	0	0
Ending balance collectively evaluated for impairment	189	139	189	139	171
Ending balance	40,616	44,110	40,616	44,110	43,783
Ending balance specifically evaluated for impairment	0	0	0	0	0
Ending balance collectively evaluated for impairment	40,616	44,110	40,616	44,110	43,783
Residential |    Construction
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	160	64	102	25	25
Charge offs	0	0	0	0	0
Recoveries	0	0	0	0	0
Provision (credit)	(18)	17	40	56	77
Ending balance	142	81	142	81	102
Ending balance specifically evaluated for impairment	0	0	0	0	0
Ending balance collectively evaluated for impairment	142	81	142	81	102
Ending balance	29,358	16,101	29,358	16,101	21,600
Ending balance specifically evaluated for impairment	0	0	0	0	0
Ending balance collectively evaluated for impairment	29,358	16,101	29,358	16,101	21,600
Residential |    Term
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	2,896	2,261	2,579	1,024	1,024
Charge offs	0	0	41	46	66
Recoveries	3	5	12	31	34
Provision (credit)	(138)	250	211	1,507	1,587
Ending balance	2,761	2,516	2,761	2,516	2,579
Ending balance specifically evaluated for impairment	129	204	129	204	163
Ending balance collectively evaluated for impairment	2,632	2,312	2,632	2,312	2,416
Ending balance	537,811	497,667	537,811	497,667	522,070
Ending balance specifically evaluated for impairment	8,782	10,182	8,782	10,182	9,414
Ending balance collectively evaluated for impairment	529,029	487,485	529,029	487,485	512,656
Home equity line of credit
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	959	1,284	1,211	1,078	1,078
Charge offs	0	0	0	153	153
Recoveries	12	1	60	20	22
Provision (credit)	(15)	172	(315)	512	264
Ending balance	956	1,457	956	1,457	1,211
Ending balance specifically evaluated for impairment	0	403	0	403	0
Ending balance collectively evaluated for impairment	956	1,054	956	1,054	1,211
Ending balance	74,594	82,982	74,594	82,982	79,750
Ending balance specifically evaluated for impairment	503	2,364	503	2,364	1,039
Ending balance collectively evaluated for impairment	74,091	80,618	74,091	80,618	78,711
Consumer
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	892	658	778	867	867
Charge offs	92	37	239	238	327
Recoveries	10	27	66	100	132
Provision (credit)	57	(56)	262	(137)	106
Ending balance	867	592	867	592	778
Ending balance specifically evaluated for impairment	0	1	0	1	0
Ending balance collectively evaluated for impairment	867	591	867	591	778
Ending balance	23,333	27,323	23,333	27,323	25,857
Ending balance specifically evaluated for impairment	4	10	4	10	8
Ending balance collectively evaluated for impairment	23,329	27,313	23,329	27,313	25,849
Unallocated
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	1,345	1,009	2,134	1,182	1,182
Charge offs	0	0	0	0	0
Recoveries	0	0	0	0	0
Provision (credit)	142	567	(647)	394	952
Ending balance	1,487	1,576	1,487	1,576	2,134
Ending balance specifically evaluated for impairment	0	0	0	0	0
Ending balance collectively evaluated for impairment	1,487	1,576	1,487	1,576	2,134
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

Stock-Based Compensation - Narr

Stock-Based Compensation - Narrative (Details) - USD ($) $ in Thousands	Apr. 28, 2020	Sep. 30, 2021	Sep. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total share based compensation cost		$ 2,135
Compensation expense recognized for restricted shares		672	$ 482
Unrecognized compensation costs		$ 855	$ 864
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)		184,487
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
2020 Plan | Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grants during the period (in shares)		40,189

Stock-Based Compensation - Summ

Stock-Based Compensation - Summary of Restricted Stock Granted (Details) - Restricted Stock - shares	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2017
2010 Plan | 2017 | Five Years
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting Term (In Years)					5 years
Shares	5,774
Remaining Term (In Years)					3 months 18 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)				1 year 3 months 18 days
2010 Plan | 2018 | Four Years
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting Term (In Years)				4 years
Shares	706
Remaining Term (In Years)				3 months 18 days
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)			3 months 18 days
2020 Plan | 2020 | Three Years
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting Term (In Years)		3 years
Shares	20,342
Remaining Term (In Years)		1 year 3 months 18 days
2020 Plan | 2020 | 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)		3 months 18 days
2010 and 2020 Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares	81,240
Remaining Term (In Years)	1 year 3 months 18 days
2010 and 2020 Equity Incentive Plan | 2021 | Three Years
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting Term (In Years)	3 years
Shares	27,172
Remaining Term (In Years)	2 years 3 months 18 days
2010 and 2020 Equity Incentive Plan | 2021 | One Year
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting Term (In Years)	1 year
Shares	4,114
Remaining Term (In Years)	3 months 18 days

Common Stock (Details)

Common Stock (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Class of Stock [Line Items]
Proceeds from sale of common stock	$ 514	$ 497
Capital Purchase Program
Class of Stock [Line Items]
Proceeds from sale of common stock	$ 514	$ 497

Earnings Per Share (Details)

Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Income (Numerator)
Net income as reported	$ 9,014	$ 7,095	$ 26,723	$ 20,159
Basic EPS: Income available to common shareholders	9,014	7,095	26,723	20,159
Diluted EPS: Income available to common shareholders plus assumed conversions	$ 9,014	$ 7,095	$ 26,723	$ 20,159
Shares (Denominator)
Basic EPS: Income available to common shareholders (in shares)	10,909,338	10,863,315	10,901,793	10,854,384
Effect of dilutive securities: restricted stock (in shares)	81,811	76,544	82,157	73,285
Diluted EPS: Income available to common shareholders plus assumed conversions (in shares)	10,991,149	10,939,859	10,983,950	10,927,669
Per-Share Amount
Basic EPS: Income available to common shareholders (usd per share)	$ 0.83	$ 0.65	$ 2.45	$ 1.86
Diluted EPS: Income available to common shareholders plus assumed conversions (usd per share)	$ 0.82	$ 0.65	$ 2.43	$ 1.84

Employee Benefit Plans - Narrat

Employee Benefit Plans - Narrative (Details)	9 Months Ended
	Sep. 30, 2021USD ($)post_retirement_benefit_plan	Sep. 30, 2020USD ($)	Dec. 31, 2020USD ($)
Retirement Benefits, Description [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%
Expense related to 401(k) plan	$ 593,000	$ 653,000
Unfunded, supplemental retirement benefits payable period	20 years
Pension expense	$ 126,000	119,000
Accrued pension liability	$ 2,902,000	$ 2,708,000	$ 2,991,000
Number of post-retirement benefit plans | post_retirement_benefit_plan	2
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
Discount rate	2.00%
Assumed health care cost trend rate	7.00%
Expected future benefit payments, current year	$ 97,000
Estimated plan expense	30,000
Effect of one percentage point increase on accumulated benefit obligation	100,000
Effect of one percentage point increase on interest cost	7,000
Effect of one percentage point increase on service cost	$ 1,000

Employee Benefit Plans - Accumu

Employee Benefit Plans - Accumulated Post-Retirement Benefit Obligation, Funded Status, and Net Periodic Benefit Cost (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Change in benefit obligation
Benefit obligation at beginning of year			$ 1,523	$ 1,581
Interest cost	$ 6	$ 16	21	48
Benefits paid			(72)	(81)
Benefit obligation at end of period	1,472	1,548	1,472	1,548
Funded status
Benefit obligation at end of period	(1,472)	(1,548)	(1,472)	(1,548)
Unamortized gain			(35)	(31)
Accrued benefit cost at end of period	(1,507)	(1,579)	(1,507)	(1,579)
Components of net periodic benefit cost
Interest cost	6	16	21	48
Net periodic benefit cost	$ 6	$ 16	$ 21	$ 48

Employee Benefit Plans - Schedu

Employee Benefit Plans - Schedule of Net Periodic Benefit Cost Not Yet Recognized (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020	Sep. 30, 2020
Retirement Benefits, Description [Abstract]
Unamortized net actuarial gain	$ 35	$ 35	$ 31
Deferred tax expense	(7)	(7)	(7)
Net unrecognized postretirement benefits included in accumulated other comprehensive income	$ 28	$ 28	$ 24

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		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance at beginning of period			$ 223,726	$ 212,508
Other comprehensive loss	$ (1,257)	$ (1,186)	(2,207)	(3,991)
Balance at end of period	238,737	219,440	238,737	219,440
Accumulated Net Investment Gain (Loss) Attributable to Parent
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance at beginning of period	1,190	7,100	5,009	3,657
Unrealized gains (losses) arising during the period	(2,442)	(2,000)	(7,112)	3,537
Reclassification of net realized (gains) losses during the period	142	0	(22)	(1,179)
Related deferred taxes	483	420	1,498	(495)
Other comprehensive loss	(1,817)	(1,580)	(5,636)	1,863
Balance at end of period	$ (627)	$ 5,520	$ (627)	$ 5,520

Other Comprehensive Income (L_4

Other Comprehensive Income (Loss) - Summary of Transfer of AFS Securities to HTM (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Reclassification of Available-for-Sale Securities to Held-to-maturity Roll Forward [Roll Forward]
Balance at beginning of period			$ 223,726	$ 212,508
Other comprehensive loss	$ (1,257)	$ (1,186)	(2,207)	(3,991)
Balance at end of period	238,737	219,440	238,737	219,440
Accumulated Net Gain (Loss) on Securities Transferred from Available-for-Sale to Held-to-Maturity
Reclassification of Available-for-Sale Securities to Held-to-maturity Roll Forward [Roll Forward]
Balance at beginning of period	(113)	(146)	(133)	(182)
Amortization of net unrealized gains	18	9	43	54
Related deferred taxes	(4)	(2)	(9)	(11)
Other comprehensive loss	14	7	34	43
Balance at end of period	$ (99)	$ (139)	$ (99)	$ (139)

Other Comprehensive Income (L_5

Other Comprehensive Income (Loss) - Summary of Derivative Financial Instruments (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of period			$ 223,726	$ 212,508
Other comprehensive loss	$ (1,257)	$ (1,186)	(2,207)	(3,991)
Balance at end of period	238,737	219,440	238,737	219,440
Accumulated Net Gain (Loss) from Cash Flow Hedges
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of period	(2,083)	(6,187)	(4,932)	97
Unrealized gains (losses) on cash flow hedging derivatives arising during the period	691	490	4,297	(7,465)
Related deferred taxes	(145)	(103)	(902)	1,568
Other comprehensive loss	546	387	3,395	(5,897)
Balance at end of period	$ (1,537)	$ (5,800)	$ (1,537)	$ (5,800)

Financial Derivative Instrume_3

Financial Derivative Instruments (Details)	3 Months Ended
	Mar. 31, 2020USD ($)	Sep. 30, 2021USD ($)derivative	Dec. 31, 2020USD ($)derivative	Sep. 30, 2020USD ($)derivative
Interest Rate Swap
Derivative [Line Items]
Expense incurred from restructuring derivatives	$ 1,760,000
Not Designated as Hedging Instrument | Customer loan interest swap agreements
Derivative [Line Items]
Collateral posted, cash		$ 6,600,000
Not Designated as Hedging Instrument | Customer Loan Swaps
Derivative [Line Items]
Required amount to be pledged		$ 3,243,000
Cash Flow Hedging | Designated as Hedging Instrument | Interest Rate Swap June 28 2021
Derivative [Line Items]
Fixed Rate Paid		0.94%
Notional Amount		$ 0	$ 30,000,000	$ 30,000,000
Fair Value		$ 0	(121,000)	(179,000)
Cash Flow Hedging | Designated as Hedging Instrument | Interest Rate Swap June 27 2021
Derivative [Line Items]
Fixed Rate Paid		0.893%
Notional Amount		$ 0	20,000,000	20,000,000
Fair Value		$ 0	(76,000)	(112,000)
Cash Flow Hedging | Designated as Hedging Instrument | Interest Rate Swap August 2 2024
Derivative [Line Items]
Fixed Rate Paid		1.59%
Notional Amount		$ 12,500,000	12,500,000	12,500,000
Fair Value		$ (381,000)	(626,000)	(692,000)
Cash Flow Hedging | Designated as Hedging Instrument | Interest Rate Swap August 5 2024
Derivative [Line Items]
Fixed Rate Paid		1.42%
Notional Amount		$ 12,500,000	12,500,000	12,500,000
Fair Value		$ (320,000)	(550,000)	(611,000)
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	25,000,000	25,000,000
Fair Value		$ (438,000)	(695,000)	(762,000)
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	25,000,000	25,000,000
Fair Value		$ (601,000)	(972,000)	(1,044,000)
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	50,000,000	50,000,000
Fair Value		$ (594,000)	(1,872,000)	(2,162,000)
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	25,000,000	25,000,000
Fair Value		$ (85,000)	(551,000)	(621,000)
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	20,000,000	20,000,000
Fair Value		$ 644,000	(339,000)	(690,000)
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	20,000,000	20,000,000
Fair Value		$ (106,000)	(185,000)	(194,000)
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	20,000,000	20,000,000
Fair Value		(64,000)	(255,000)	(275,000)
Cash Flow Hedging | Designated as Hedging Instrument | Interest Rate Swap
Derivative [Line Items]
Notional Amount		210,000,000	260,000,000	260,000,000
Fair Value		(1,945,000)	(6,242,000)	(7,342,000)
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 derivative instruments | derivative		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 derivative instruments | derivative		7
Cash Flow Hedging | Designated as Hedging Instrument | Customer Loan Swaps Maturity Dates December 19, 2029 and October 1, 2039
Derivative [Line Items]
Number of derivative instruments | derivative		6
Cash Flow Hedging | Not Designated as Hedging Instrument | Customer loan interest swap agreements
Derivative [Line Items]
Fair Value		$ 0	$ 0	$ 0
Number of derivative instruments | derivative		12	10	8
Derivative notional amount		$ 81,306,000	$ 65,974,000	$ 57,082,000
Cash Flow Hedging | Not Designated as Hedging Instrument | Customer loan interest swap agreements | Pay Fixed, Receive Variable
Derivative [Line Items]
Fair Value		$ (1,061,000)	$ (2,566,000)	$ (3,311,000)
Number of derivative instruments | derivative		6	5	4
Derivative notional amount		$ 40,653,000	$ 32,987,000	$ 28,541,000
Cash Flow Hedging | Not Designated as Hedging Instrument | Customer loan interest swap agreements | Receive Fixed, Pay Variable
Derivative [Line Items]
Fair Value		$ 1,061,000	$ 2,566,000	$ 3,311,000
Number of derivative instruments | derivative		6	5	4
Derivative notional amount		$ 40,653,000	$ 32,987,000	$ 28,541,000
Cash Flow Hedging | Not Designated as Hedging Instrument | Other Assets | Customer loan interest swap agreements | Pay Fixed, Receive Variable
Derivative [Line Items]
Fair Value		$ 801,000	$ 37,000	$ 0
Number of derivative instruments | derivative		3	3	0
Derivative notional amount		$ 15,885,000	$ 16,922,000	$ 0
Cash Flow Hedging | Not Designated as Hedging Instrument | Other Assets | Customer loan interest swap agreements | Receive Fixed, Pay Variable
Derivative [Line Items]
Fair Value		$ 1,862,000	$ 2,603,000	$ 3,311,000
Number of derivative instruments | derivative		3	2	4
Derivative notional amount		$ 24,768,000	$ 16,065,000	$ 28,541,000
Cash Flow Hedging | Not Designated as Hedging Instrument | Other Liabilities | Customer loan interest swap agreements | Pay Fixed, Receive Variable
Derivative [Line Items]
Fair Value		$ (1,862,000)	$ (2,603,000)	$ (3,311,000)
Number of derivative instruments | derivative		3	2	4
Derivative notional amount		$ 24,768,000	$ 16,065,000	$ 28,541,000
Cash Flow Hedging | Not Designated as Hedging Instrument | Other Liabilities | Customer loan interest swap agreements | Receive Fixed, Pay Variable
Derivative [Line Items]
Fair Value		$ (801,000)	$ (37,000)	$ 0
Number of derivative instruments | derivative		3	3	0
Derivative notional amount		$ 15,885,000	$ 16,922,000	$ 0

Mortgage Servicing Rights - Nar

Mortgage Servicing Rights - Narrative (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Transfers and Servicing [Abstract]
Moving average of weekly prepayment data (in months)	3 months
Anticipated loan prepayment rate of servicing assets (in hundredths)	12.48%
Servicing assets and servicing liabilities at fair value, assumptions used to estimate fair value, discount rate adjustment factor (in hundredths)	9.00%
Mortgage servicing rights capitalized	$ 859	$ 926
Amortization of mortgage servicing rights	485	252
Fair value of mortgage servicing rights	2,757	2,013	$ 1,985
Outstanding principal balance of loans serviced for others	$ 353,633	$ 315,426	$ 318,459

Mortgage Servicing Rights - Sch

Mortgage Servicing Rights - Schedule of Mortgage Servicing Rights (Details) - USD ($) $ in Thousands	9 Months Ended		12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Transfers and Servicing [Abstract]
Mortgage servicing rights	$ 8,158	$ 7,066	$ 7,299
Accumulated amortization	(5,470)	(4,846)	(4,985)
Amortized cost	2,688	2,220	2,314
Impairment reserve	(91)	(258)	(358)
Carrying value	$ 2,597	$ 1,962	$ 1,956

Certificates of Deposit (Detail

Certificates of Deposit (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020	Sep. 30, 2020
Deposits [Abstract]
Certificates of deposit of less than $100,000	$ 194,373	$ 246,875	$ 252,461
Certificates $100,000 to $250,000	263,860	295,672	269,881
Certificates $250,000 and over	56,334	63,038	67,589
Total certificates of deposit	$ 514,567	$ 605,585	$ 589,931

Fair Value - Assets and Liabili

Fair Value - Assets and Liabilities Recorded at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020	Sep. 30, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	$ 309,224	$ 313,376	$ 340,140
U.S. Government-sponsored agencies
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	21,939	22,730	27,497
Mortgage-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	247,253	243,406	276,424
State and political subdivisions
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	35,179	39,474	36,219
Asset-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	4,853	7,766
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	0
Derivative assets	0
Total assets	0	0	0
Derivative liabilities	0	0	0
Fair Value, Measurements, Recurring | Level 1 | Interest rate swap agreements
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	0
Derivative liabilities	0	0	0
Fair Value, Measurements, Recurring | Level 1 | Customer loan interest swap agreements
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	0	0	0
Derivative liabilities	0	0
Fair Value, Measurements, Recurring | Level 1 | U.S. Government-sponsored agencies
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	0	0	0
Fair Value, Measurements, Recurring | Level 1 |    Mortgage-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	0	0	0
Fair Value, Measurements, Recurring | Level 1 |    State and political subdivisions
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	0	0	0
Fair Value, Measurements, Recurring | Level 1 | Asset-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	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	309,224	313,376	340,140
Derivative assets	3,307
Total assets	312,531	316,016	343,451
Derivative liabilities	5,252	8,882	10,653
Fair Value, Measurements, Recurring | Level 2 | Interest rate swap agreements
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	644
Derivative liabilities	2,589	6,242	7,342
Fair Value, Measurements, Recurring | Level 2 | Customer loan interest swap agreements
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	2,663	2,640	3,311
Derivative liabilities	2,663	2,640
Fair Value, Measurements, Recurring | Level 2 | U.S. Government-sponsored agencies
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	21,939	22,730	27,497
Fair Value, Measurements, Recurring | Level 2 |    Mortgage-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	247,253	243,406	276,424
Fair Value, Measurements, Recurring | Level 2 |    State and political subdivisions
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	35,179	39,474	36,219
Fair Value, Measurements, Recurring | Level 2 | Asset-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	4,853	7,766
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	0
Derivative assets	0
Total assets	0	0	0
Derivative liabilities	0	0	0
Fair Value, Measurements, Recurring | Level 3 | Interest rate swap agreements
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	0
Derivative liabilities	0	0	0
Fair Value, Measurements, Recurring | Level 3 | Customer loan interest swap agreements
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	0	0	0
Derivative liabilities	0	0	0
Fair Value, Measurements, Recurring | Level 3 | U.S. Government-sponsored agencies
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	0	0	0
Fair Value, Measurements, Recurring | Level 3 |    Mortgage-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	0	0	0
Fair Value, Measurements, Recurring | Level 3 |    State and political subdivisions
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	0	0	0
Fair Value, Measurements, Recurring | Level 3 | Asset-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	0	0
Fair Value, Measurements, Recurring | Total Fair Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	309,224	313,376	340,140
Derivative assets	3,307
Total assets	312,531	316,016	343,451
Derivative liabilities	5,252	8,882	10,653
Fair Value, Measurements, Recurring | Total Fair Value | Interest rate swap agreements
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	644
Derivative liabilities	2,589	6,242	7,342
Fair Value, Measurements, Recurring | Total Fair Value | Customer loan interest swap agreements
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	2,663	2,640	3,311
Derivative liabilities	2,663	2,640
Fair Value, Measurements, Recurring | Total Fair Value | U.S. Government-sponsored agencies
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	21,939	22,730	27,497
Fair Value, Measurements, Recurring | Total Fair Value |    Mortgage-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	247,253	243,406	276,424
Fair Value, Measurements, Recurring | Total Fair Value |    State and political subdivisions
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	35,179	39,474	$ 36,219
Fair Value, Measurements, Recurring | Total Fair Value | Asset-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	$ 4,853	$ 7,766

Fair Value - Additional Informa

Fair Value - Additional Information (Details) - USD ($)	9 Months Ended		12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Fair Value Disclosures [Abstract]
Mortgage servicing rights impairment	$ 91,000	$ 258,000	$ 358,000
Other real estate owned, valuation allowance	0	45,000	45,000
Valuation allowance on impaired financing receivable	$ 457,000	$ 633,000	$ 304,000

Fair Value - Assets Recorded at

Fair Value - Assets Recorded at Fair Value on a Non-Recurring Basis (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020	Sep. 30, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgage servicing rights	$ 2,757	$ 1,985	$ 2,013
Other real estate owned	0	908	777
Total Fair Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgage servicing rights	2,757	1,985	2,013
Total Fair Value | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgage servicing rights	0	0	0
Total Fair Value | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgage servicing rights	2,757	1,985	2,013
Total Fair Value | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgage servicing rights	0	0	0
Fair Value, Measurements, Nonrecurring | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgage servicing rights	0	0	0
Other real estate owned		0	0
Impaired loans	0	0	0
Total assets	0	0	0
Fair Value, Measurements, Nonrecurring | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgage servicing rights	2,757	1,985	2,013
Other real estate owned		908	777
Impaired loans	224	794	789
Total assets	2,981	3,687	3,579
Fair Value, Measurements, Nonrecurring | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgage servicing rights	0	0	0
Other real estate owned		0	0
Impaired loans	0	0	0
Total assets	0	0	0
Fair Value, Measurements, Nonrecurring | Total Fair Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgage servicing rights	2,757	1,985	2,013
Other real estate owned		908	777
Impaired loans	224	794	789
Total assets	$ 2,981	$ 3,687	$ 3,579

Fair Value - Assets and Liabi_2

Fair Value - Assets and Liabilities at Fair Value (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020	Sep. 30, 2020
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Securities to be held to maturity	$ 379,797	$ 377,134	$ 342,062
Mortgage servicing rights	2,757	1,985	2,013
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Local certificates of deposit	514,567	605,585	589,931
Total deposits	2,033,213	1,844,611	1,763,059
Carrying value
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Securities to be held to maturity	375,699	365,613	331,962
Loans	1,599,705	1,460,508	1,421,275
Mortgage servicing rights	2,597	1,956	1,962
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Local certificates of deposit	238,170	250,264	253,863
National certificates of deposit	276,397	355,321	336,068
Total deposits	514,567	605,585	589,931
Repurchase agreements	88,109	69,340	66,087
Federal Home Loan Bank and Federal Reserve Bank borrowings	145,092	192,698	217,700
Total borrowed funds	233,201	262,038	283,787
Carrying value | Commercial |    Real estate
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Loans	542,975	436,161	401,822
Carrying value | Commercial |    Construction
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Loans	72,341	55,803	51,362
Carrying value | Commercial |    Other
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Loans	284,048	281,057	305,239
Carrying value | Municipal
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Loans	40,409	43,586	43,955
Carrying value | Residential |    Construction
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Loans	29,203	21,483	16,011
Carrying value | Residential |    Term
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Loans	534,794	519,101	494,864
Carrying value | Home equity line of credit
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Loans	73,549	78,356	81,359
Carrying value | Consumer
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Loans	22,386	24,961	26,663
Total Fair Value
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Securities to be held to maturity	379,797	377,134	342,062
Loans	1,595,673	1,476,692	1,431,729
Mortgage servicing rights	2,757	1,985	2,013
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Local certificates of deposit	239,239	253,892	255,553
National certificates of deposit	279,653	359,899	343,022
Total deposits	518,892	613,791	598,575
Repurchase agreements	86,114	69,497	55,085
Federal Home Loan Bank and Federal Reserve Bank borrowings	146,411	194,469	197,527
Total borrowed funds	232,525	263,966	252,612
Total Fair Value | Commercial |    Real estate
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Loans	537,937	440,735	406,575
Total Fair Value | Commercial |    Construction
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Loans	71,670	56,388	51,970
Total Fair Value | Commercial |    Other
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Loans	283,585	279,501	302,600
Total Fair Value | Municipal
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Loans	40,133	44,440	44,203
Total Fair Value | Residential |    Construction
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Loans	29,593	21,890	16,178
Total Fair Value | Residential |    Term
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Loans	540,586	533,059	505,357
Total Fair Value | Home equity line of credit
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Loans	71,591	77,177	80,160
Total Fair Value | Consumer
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Loans	20,578	23,502	24,686
Total Fair Value | Level 1
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Securities to be held to maturity	0	0	0
Loans	0	0	0
Mortgage servicing rights	0	0	0
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Local certificates of deposit	0	0	0
National certificates of deposit	0	0	0
Total deposits	0	0	0
Repurchase agreements	0	0	0
Federal Home Loan Bank and Federal Reserve Bank borrowings	0	0	0
Total borrowed funds	0	0	0
Total Fair Value | Level 1 | Commercial |    Real estate
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Loans	0	0	0
Total Fair Value | Level 1 | Commercial |    Construction
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Loans	0	0	0
Total Fair Value | Level 1 | Commercial |    Other
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Loans	0	0	0
Total Fair Value | Level 1 | Municipal
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Loans	0	0	0
Total Fair Value | Level 1 | Residential |    Construction
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Loans	0	0	0
Total Fair Value | Level 1 | Residential |    Term
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Loans	0	0	0
Total Fair Value | Level 1 | Home equity line of credit
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Loans	0	0	0
Total Fair Value | Level 1 | Consumer
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Loans	0	0	0
Total Fair Value | Level 2
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Securities to be held to maturity	379,797	377,134	342,062
Loans	224	794	789
Mortgage servicing rights	2,757	1,985	2,013
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Local certificates of deposit	239,239	253,892	255,553
National certificates of deposit	279,653	359,899	343,022
Total deposits	518,892	613,791	598,575
Repurchase agreements	86,114	69,497	55,085
Federal Home Loan Bank and Federal Reserve Bank borrowings	146,411	194,469	197,527
Total borrowed funds	232,525	263,966	252,612
Total Fair Value | Level 2 | Commercial |    Real estate
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Loans	0	347	13
Total Fair Value | Level 2 | Commercial |    Construction
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Loans	0	0	0
Total Fair Value | Level 2 | Commercial |    Other
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Loans	5	5	33
Total Fair Value | Level 2 | Municipal
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Loans	0	0	0
Total Fair Value | Level 2 | Residential |    Construction
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Loans	0	0	0
Total Fair Value | Level 2 | Residential |    Term
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Loans	219	442	277
Total Fair Value | Level 2 | Home equity line of credit
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Loans	0	0	457
Total Fair Value | Level 2 | Consumer
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Loans	0	0	9
Total Fair Value | Level 3
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Securities to be held to maturity	0	0	0
Loans	1,595,449	1,475,898	1,430,940
Mortgage servicing rights	0	0	0
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Local certificates of deposit	0	0	0
National certificates of deposit	0	0	0
Total deposits	0	0	0
Repurchase agreements	0	0	0
Federal Home Loan Bank and Federal Reserve Bank borrowings	0	0	0
Total borrowed funds	0	0	0
Total Fair Value | Level 3 | Commercial |    Real estate
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Loans	537,937	440,388	406,562
Total Fair Value | Level 3 | Commercial |    Construction
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Loans	71,670	56,388	51,970
Total Fair Value | Level 3 | Commercial |    Other
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Loans	283,580	279,496	302,567
Total Fair Value | Level 3 | Municipal
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Loans	40,133	44,440	44,203
Total Fair Value | Level 3 | Residential |    Construction
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Loans	29,593	21,890	16,178
Total Fair Value | Level 3 | Residential |    Term
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Loans	540,367	532,617	505,080
Total Fair Value | Level 3 | Home equity line of credit
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Loans	71,591	77,177	79,703
Total Fair Value | Level 3 | Consumer
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Loans	$ 20,578	$ 23,502	$ 24,677