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Fair Value - Carrying Amounts and Estimated Fair Values (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024	Mar. 31, 2024
Financial assets
Securities to be held to maturity (net of allowance for credit losses)	$ 312,788	$ 314,993	$ 327,816
Mortgage servicing rights	2,973	3,054	3,423
Financial liabilities
Local certificates of deposit	1,169,516	1,114,811	1,065,427
Total deposits	2,711,335	2,725,251	2,548,988
Carrying value
Financial assets
Securities to be held to maturity (net of allowance for credit losses)	368,571	369,704	379,453
Total loans	2,358,036	2,316,069	2,149,539
Mortgage servicing rights	1,835	1,894	2,096
Financial liabilities
Local certificates of deposit	380,408	385,897	370,364
National certificates of deposit	789,108	728,914	695,063
Total deposits	1,169,516	1,114,811	1,065,427
Repurchase agreements	55,539	51,278	47,845
Federal Home Loan Bank advances	129,905	95,000	106,934
Total borrowed funds	185,444	146,278	154,779
Carrying value | Commercial |    Real estate
Financial assets
Total loans	773,936	752,613	717,709
Carrying value | Commercial | Construction
Financial assets
Total loans	75,783	98,773	84,997
Carrying value | Commercial |    Other
Financial assets
Total loans	551,967	519,560	461,281
Carrying value | Municipal
Financial assets
Total loans	54,868	61,565	54,552
Carrying value | Residential | Construction
Financial assets
Total loans	34,962	35,007	34,262
Carrying value | Residential | Term
Financial assets
Total loans	714,088	705,566	672,739
Carrying value | Home Equity
Financial assets
Total loans	130,771	122,377	105,137
Carrying value | Consumer
Financial assets
Total loans	21,661	20,608	18,862
Total Fair Value
Financial assets
Securities to be held to maturity (net of allowance for credit losses)	312,788	314,993	327,816
Total loans	2,262,880	2,202,820	2,016,120
Mortgage servicing rights	2,973	3,054	3,423
Financial liabilities
Local certificates of deposit	359,404	365,937	351,799
National certificates of deposit	809,997	747,681	704,387
Total deposits	1,169,401	1,113,618	1,056,186
Repurchase agreements	55,435	51,181	47,734
Federal Home Loan Bank advances	130,213	95,066	81,863
Total borrowed funds	185,648	146,247	129,597
Total Fair Value | Commercial |    Real estate
Financial assets
Total loans	750,258	720,898	679,690
Total Fair Value | Commercial | Construction
Financial assets
Total loans	73,464	94,611	80,494
Total Fair Value | Commercial |    Other
Financial assets
Total loans	548,918	513,417	446,607
Total Fair Value | Municipal
Financial assets
Total loans	50,617	57,657	51,889
Total Fair Value | Residential | Construction
Financial assets
Total loans	34,653	34,631	33,801
Total Fair Value | Residential | Term
Financial assets
Total loans	655,427	643,402	602,025
Total Fair Value | Home Equity
Financial assets
Total loans	130,190	119,930	104,938
Total Fair Value | Consumer
Financial assets
Total loans	19,353	18,274	16,676
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)	312,788	314,993	327,816
Total loans	318	538	0
Mortgage servicing rights	2,973	3,054	3,423
Financial liabilities
Local certificates of deposit	359,404	365,937	351,799
National certificates of deposit	809,997	747,681	704,387
Total deposits	1,169,401	1,113,618	1,056,186
Repurchase agreements	55,435	51,181	47,734
Federal Home Loan Bank advances	130,213	95,066	81,863
Total borrowed funds	185,648	146,247	129,597
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	318	538	0
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	0	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	2,262,562	2,202,282	2,016,120
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	750,258	720,898	679,690
Total Fair Value | Level 3 | Commercial | Construction
Financial assets
Total loans	73,464	94,611	80,494
Total Fair Value | Level 3 | Commercial |    Other
Financial assets
Total loans	548,600	512,879	446,607
Total Fair Value | Level 3 | Municipal
Financial assets
Total loans	50,617	57,657	51,889
Total Fair Value | Level 3 | Residential | Construction
Financial assets
Total loans	34,653	34,631	33,801
Total Fair Value | Level 3 | Residential | Term
Financial assets
Total loans	655,427	643,402	602,025
Total Fair Value | Level 3 | Home Equity
Financial assets
Total loans	130,190	119,930	104,938
Total Fair Value | Level 3 | Consumer
Financial assets
Total loans	$ 19,353	$ 18,274	$ 16,676

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