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Fair Value - Carrying Amounts and Estimated Fair Values (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023	Mar. 31, 2023
Financial assets
Securities to be held to maturity (net of allowance for credit losses)	$ 327,816	$ 338,570	$ 344,053
Mortgage servicing rights	3,423	3,583	3,505
Financial liabilities
Local certificates of deposit	1,065,427	1,070,247	1,009,667
Total deposits	2,548,988	2,599,662	2,466,701
Carrying value
Financial assets
Securities to be held to maturity (net of allowance for credit losses)	379,453	385,235	391,845
Total loans	2,149,539	2,105,424	1,959,389
Mortgage servicing rights	2,096	2,177	2,402
Financial liabilities
Local certificates of deposit	370,364	293,466	336,449
National certificates of deposit	695,063	776,781	673,218
Total deposits	1,065,427	1,070,247	1,009,667
Repurchase agreements	47,845	49,576	51,500
Federal Home Loan Bank advances	106,934	20,076	32,381
Total borrowed funds	154,779	69,652	83,881
Carrying value | Commercial |    Real estate
Financial assets
Total loans	717,709	699,537	660,789
Carrying value | Commercial | Construction
Financial assets
Total loans	84,997	86,695	70,921
Carrying value | Commercial |    Other
Financial assets
Total loans	461,281	443,944	414,733
Carrying value | Municipal
Financial assets
Total loans	54,552	51,089	46,859
Carrying value | Residential | Construction
Financial assets
Total loans	34,262	31,740	51,763
Carrying value | Residential | Term
Financial assets
Total loans	672,739	669,864	602,241
Carrying value | Home Equity
Financial assets
Total loans	105,137	103,400	92,919
Carrying value | Consumer
Financial assets
Total loans	18,862	19,155	19,164
Total Fair Value
Financial assets
Securities to be held to maturity (net of allowance for credit losses)	327,816	338,570	344,053
Total loans	2,016,120	1,964,228	1,848,450
Mortgage servicing rights	3,423	3,583	3,505
Financial liabilities
Local certificates of deposit	351,799	362,555	308,631
National certificates of deposit	704,387	699,919	681,961
Total deposits	1,056,186	1,062,474	990,592
Repurchase agreements	47,734	49,462	51,392
Federal Home Loan Bank advances	81,863	20,074	32,376
Total borrowed funds	129,597	69,536	83,768
Total Fair Value | Commercial |    Real estate
Financial assets
Total loans	679,690	658,732	630,944
Total Fair Value | Commercial | Construction
Financial assets
Total loans	80,494	81,638	67,440
Total Fair Value | Commercial |    Other
Financial assets
Total loans	446,607	431,067	399,552
Total Fair Value | Municipal
Financial assets
Total loans	51,889	46,806	44,635
Total Fair Value | Residential | Construction
Financial assets
Total loans	33,801	31,131	44,686
Total Fair Value | Residential | Term
Financial assets
Total loans	602,025	595,033	549,823
Total Fair Value | Home Equity
Financial assets
Total loans	104,938	102,858	94,010
Total Fair Value | Consumer
Financial assets
Total loans	16,676	16,963	17,360
Total Fair Value | Level 1
Financial assets
Securities to be held to maturity (net of allowance for credit losses)	0	0	0
Total loans	0	0	0
Mortgage servicing rights	0	0	0
Financial liabilities
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 advances	0	0	0
Total borrowed funds	0	0	0
Total Fair Value | Level 1 | Commercial |    Real estate
Financial assets
Total loans	0	0	0
Total Fair Value | Level 1 | Commercial | Construction
Financial assets
Total loans	0	0	0
Total Fair Value | Level 1 | Commercial |    Other
Financial assets
Total loans	0	0	0
Total Fair Value | Level 1 | Municipal
Financial assets
Total loans	0	0	0
Total Fair Value | Level 1 | Residential | Construction
Financial assets
Total loans	0	0	0
Total Fair Value | Level 1 | Residential | Term
Financial assets
Total loans	0	0	0
Total Fair Value | Level 1 | Home Equity
Financial assets
Total loans	0	0	0
Total Fair Value | Level 1 | Consumer
Financial assets
Total loans	0	0	0
Total Fair Value | Level 2
Financial assets
Securities to be held to maturity (net of allowance for credit losses)	327,816	338,570	344,053
Total loans	0	285	20
Mortgage servicing rights	3,423	3,583	3,505
Financial liabilities
Local certificates of deposit	351,799	362,555	308,631
National certificates of deposit	704,387	699,919	681,961
Total deposits	1,056,186	1,062,474	990,592
Repurchase agreements	47,734	49,462	51,392
Federal Home Loan Bank advances	81,863	20,074	32,376
Total borrowed funds	129,597	69,536	83,768
Total Fair Value | Level 2 | Commercial |    Real estate
Financial assets
Total loans	0	0	0
Total Fair Value | Level 2 | Commercial | Construction
Financial assets
Total loans	0	0	0
Total Fair Value | Level 2 | Commercial |    Other
Financial assets
Total loans	0	0	20
Total Fair Value | Level 2 | Municipal
Financial assets
Total loans	0	0	0
Total Fair Value | Level 2 | Residential | Construction
Financial assets
Total loans	0	0	0
Total Fair Value | Level 2 | Residential | Term
Financial assets
Total loans	0	285	0
Total Fair Value | Level 2 | Home Equity
Financial assets
Total loans	0	0	0
Total Fair Value | Level 2 | Consumer
Financial assets
Total loans	0	0	0
Total Fair Value | Level 3
Financial assets
Securities to be held to maturity (net of allowance for credit losses)	0	0	0
Total loans	2,016,120	1,963,943	1,848,430
Mortgage servicing rights	0	0	0
Financial liabilities
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 advances	0	0	0
Total borrowed funds	0	0	0
Total Fair Value | Level 3 | Commercial |    Real estate
Financial assets
Total loans	679,690	658,732	630,944
Total Fair Value | Level 3 | Commercial | Construction
Financial assets
Total loans	80,494	81,638	67,440
Total Fair Value | Level 3 | Commercial |    Other
Financial assets
Total loans	446,607	431,067	399,532
Total Fair Value | Level 3 | Municipal
Financial assets
Total loans	51,889	46,806	44,635
Total Fair Value | Level 3 | Residential | Construction
Financial assets
Total loans	33,801	31,131	44,686
Total Fair Value | Level 3 | Residential | Term
Financial assets
Total loans	602,025	594,748	549,823
Total Fair Value | Level 3 | Home Equity
Financial assets
Total loans	104,938	102,858	94,010
Total Fair Value | Level 3 | Consumer
Financial assets
Total loans	$ 16,676	$ 16,963	$ 17,360

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Fair value of investment in debt security measured at amortized cost (held-to-maturity).

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