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Fair Value - Carrying Amounts and Estimated Fair Values (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
Sep. 30, 2024
Financial assets      
Securities to be held to maturity (net of allowance for credit losses) $ 316,574 $ 314,993 $ 333,575
Mortgage servicing rights 2,775 3,054 3,074
Financial liabilities      
Local certificates of deposit 1,071,527 1,114,811 1,125,326
Total deposits 2,737,550 2,725,251 2,702,718
Carrying value      
Financial assets      
Securities to be held to maturity (net of allowance for credit losses) 362,552 369,704 377,635
Total loans 2,373,765 2,316,069 2,283,254
Mortgage servicing rights 1,716 1,894 1,940
Financial liabilities      
Local certificates of deposit 400,172 385,897 377,750
National certificates of deposit 671,355 728,914 747,576
Total deposits 1,071,527 1,114,811 1,125,326
Repurchase agreements 57,468 51,278 56,027
Federal Home Loan Bank advances 95,500 95,000 95,000
Total borrowed funds 152,968 146,278 151,027
Carrying value | Commercial | Real estate      
Financial assets      
Total loans 779,849 752,613 746,558
Carrying value | Commercial | Construction      
Financial assets      
Total loans 51,334 98,773 87,185
Carrying value | Commercial | Other      
Financial assets      
Total loans 561,646 519,560 523,624
Carrying value | Municipal      
Financial assets      
Total loans 68,305 61,565 62,678
Carrying value | Residential | Construction      
Financial assets      
Total loans 32,343 35,007 34,203
Carrying value | Residential | Term      
Financial assets      
Total loans 725,201 705,566 693,017
Carrying value | Home Equity      
Financial assets      
Total loans 136,169 122,377 116,365
Carrying value | Consumer      
Financial assets      
Total loans 18,918 20,608 19,624
Estimated fair value      
Financial assets      
Securities to be held to maturity (net of allowance for credit losses) 316,574 314,993 333,575
Total loans 2,293,875 2,202,820 2,172,931
Mortgage servicing rights 2,775 3,054 3,074
Financial liabilities      
Local certificates of deposit 375,001 365,937 360,988
National certificates of deposit 699,204 747,681 768,270
Total deposits 1,074,205 1,113,618 1,129,258
Repurchase agreements 57,365 51,181 55,910
Federal Home Loan Bank advances 95,837 95,066 94,914
Total borrowed funds 153,202 146,247 150,824
Estimated fair value | Commercial | Real estate      
Financial assets      
Total loans 761,198 720,898 714,398
Estimated fair value | Commercial | Construction      
Financial assets      
Total loans 50,106 94,611 83,429
Estimated fair value | Commercial | Other      
Financial assets      
Total loans 559,233 513,417 516,977
Estimated fair value | Municipal      
Financial assets      
Total loans 64,726 57,657 57,578
Estimated fair value | Residential | Construction      
Financial assets      
Total loans 32,084 34,631 33,869
Estimated fair value | Residential | Term      
Financial assets      
Total loans 673,863 643,402 633,247
Estimated fair value | Home Equity      
Financial assets      
Total loans 135,993 119,930 116,058
Estimated fair value | Consumer      
Financial assets      
Total loans 16,672 18,274 17,375
Estimated 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
Estimated fair value | Level 1 | Commercial | Real estate      
Financial assets      
Total loans 0 0 0
Estimated fair value | Level 1 | Commercial | Construction      
Financial assets      
Total loans 0 0 0
Estimated fair value | Level 1 | Commercial | Other      
Financial assets      
Total loans 0 0 0
Estimated fair value | Level 1 | Municipal      
Financial assets      
Total loans 0 0 0
Estimated fair value | Level 1 | Residential | Construction      
Financial assets      
Total loans 0 0 0
Estimated fair value | Level 1 | Residential | Term      
Financial assets      
Total loans 0 0 0
Estimated fair value | Level 1 | Home Equity      
Financial assets      
Total loans 0 0 0
Estimated fair value | Level 1 | Consumer      
Financial assets      
Total loans 0 0 0
Estimated fair value | Level 2      
Financial assets      
Securities to be held to maturity (net of allowance for credit losses) 316,574 314,993 333,575
Total loans 430 538 0
Mortgage servicing rights 2,775 3,054 3,074
Financial liabilities      
Local certificates of deposit 375,001 365,937 360,988
National certificates of deposit 699,204 747,681 768,270
Total deposits 1,074,205 1,113,618 1,129,258
Repurchase agreements 57,365 51,181 55,910
Federal Home Loan Bank advances 95,837 95,066 94,914
Total borrowed funds 153,202 146,247 150,824
Estimated fair value | Level 2 | Commercial | Real estate      
Financial assets      
Total loans 0 0 0
Estimated fair value | Level 2 | Commercial | Construction      
Financial assets      
Total loans 0 0 0
Estimated fair value | Level 2 | Commercial | Other      
Financial assets      
Total loans 430 538 0
Estimated fair value | Level 2 | Municipal      
Financial assets      
Total loans 0 0 0
Estimated fair value | Level 2 | Residential | Construction      
Financial assets      
Total loans 0 0 0
Estimated fair value | Level 2 | Residential | Term      
Financial assets      
Total loans 0 0 0
Estimated fair value | Level 2 | Home Equity      
Financial assets      
Total loans 0 0 0
Estimated fair value | Level 2 | Consumer      
Financial assets      
Total loans 0 0 0
Estimated fair value | Level 3      
Financial assets      
Securities to be held to maturity (net of allowance for credit losses) 0 0 0
Total loans 2,293,445 2,202,282 2,172,931
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
Estimated fair value | Level 3 | Commercial | Real estate      
Financial assets      
Total loans 761,198 720,898 714,398
Estimated fair value | Level 3 | Commercial | Construction      
Financial assets      
Total loans 50,106 94,611 83,429
Estimated fair value | Level 3 | Commercial | Other      
Financial assets      
Total loans 558,803 512,879 516,977
Estimated fair value | Level 3 | Municipal      
Financial assets      
Total loans 64,726 57,657 57,578
Estimated fair value | Level 3 | Residential | Construction      
Financial assets      
Total loans 32,084 34,631 33,869
Estimated fair value | Level 3 | Residential | Term      
Financial assets      
Total loans 673,863 643,402 633,247
Estimated fair value | Level 3 | Home Equity      
Financial assets      
Total loans 135,993 119,930 116,058
Estimated fair value | Level 3 | Consumer      
Financial assets      
Total loans $ 16,672 $ 18,274 $ 17,375