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Fair Value - Carrying Amounts and Estimated Fair Values (Details) - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Sep. 30, 2022
Financial assets      
Securities to be held to maturity (net of allowance for credit losses) $ 311,864 $ 339,011 $ 313,796
Mortgage servicing rights 3,673 3,734 3,789
Financial liabilities      
Local certificates of deposit 1,009,166 867,671 786,176
Total deposits 2,599,937 2,378,877 2,369,949
Carrying value      
Financial assets      
Securities to be held to maturity (net of allowance for credit losses) 387,374 393,896 381,906
Loans 2,056,806 1,898,226 1,841,588
Mortgage servicing rights 2,246 2,493 2,594
Financial liabilities      
Local certificates of deposit 338,280 291,152 252,211
National certificates of deposit 670,886 576,519 533,965
Total deposits 1,009,166 867,671 786,176
Repurchase agreements 52,915 64,409 68,258
Federal Home Loan Bank advances 30,078 39,074 50,085
Total borrowed funds 82,993 103,483 118,343
Carrying value | Commercial | Real Estate      
Financial assets      
Loans 688,027 692,541 632,385
Carrying value | Commercial | Construction      
Financial assets      
Loans 70,822 92,994 127,765
Carrying value | Commercial |    Other      
Financial assets      
Loans 435,563 315,917 306,692
Carrying value | Municipal      
Financial assets      
Loans 58,071 40,439 48,521
Carrying value | Residential | Construction      
Financial assets      
Loans 28,410 49,686 41,440
Carrying value | Residential | Term      
Financial assets      
Loans 655,431 611,350 592,143
Carrying value | Home Equity      
Financial assets      
Loans 101,363 75,416 72,812
Carrying value | Consumer      
Financial assets      
Loans 19,119 19,883 19,830
Total Fair Value      
Financial assets      
Securities to be held to maturity (net of allowance for credit losses) 311,864 339,011 313,796
Loans 1,920,157 1,809,678 1,765,525
Mortgage servicing rights 3,673 3,734 3,789
Financial liabilities      
Local certificates of deposit 319,218 275,658 239,377
National certificates of deposit 672,654 569,883 525,169
Total deposits 991,872 845,541 764,546
Repurchase agreements 52,793 64,289 59,208
Federal Home Loan Bank advances 30,074 39,064 50,071
Total borrowed funds 82,867 103,353 109,279
Total Fair Value | Commercial | Real Estate      
Financial assets      
Loans 652,297 669,752 615,560
Total Fair Value | Commercial | Construction      
Financial assets      
Loans 67,144 89,934 124,366
Total Fair Value | Commercial |    Other      
Financial assets      
Loans 423,464 312,219 304,024
Total Fair Value | Municipal      
Financial assets      
Loans 52,196 38,069 46,475
Total Fair Value | Residential | Construction      
Financial assets      
Loans 27,972 44,410 37,263
Total Fair Value | Residential | Term      
Financial assets      
Loans 577,982 558,274 543,378
Total Fair Value | Home Equity      
Financial assets      
Loans 102,124 78,878 76,287
Total Fair Value | Consumer      
Financial assets      
Loans 16,978 18,142 18,172
Total Fair Value | Level 1      
Financial assets      
Securities to be held to maturity (net of allowance for credit losses) 0 0 0
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      
Loans 0 0 0
Total Fair Value | Level 1 | Commercial | Construction      
Financial assets      
Loans 0 0 0
Total Fair Value | Level 1 | Commercial |    Other      
Financial assets      
Loans 0 0 0
Total Fair Value | Level 1 | Municipal      
Financial assets      
Loans 0 0 0
Total Fair Value | Level 1 | Residential | Construction      
Financial assets      
Loans 0 0 0
Total Fair Value | Level 1 | Residential | Term      
Financial assets      
Loans 0 0 0
Total Fair Value | Level 1 | Home Equity      
Financial assets      
Loans 0 0 0
Total Fair Value | Level 1 | Consumer      
Financial assets      
Loans 0 0 0
Total Fair Value | Level 2      
Financial assets      
Securities to be held to maturity (net of allowance for credit losses) 311,864 339,011 313,796
Loans 285 20 5
Mortgage servicing rights 3,673 3,734 3,789
Financial liabilities      
Local certificates of deposit 319,218 275,658 239,377
National certificates of deposit 672,654 569,883 525,169
Total deposits 991,872 845,541 764,546
Repurchase agreements 52,793 64,289 59,208
Federal Home Loan Bank advances 30,074 39,064 50,071
Total borrowed funds 82,867 103,353 109,279
Total Fair Value | Level 2 | Commercial | Real Estate      
Financial assets      
Loans 0 0 0
Total Fair Value | Level 2 | Commercial | Construction      
Financial assets      
Loans 0 0 0
Total Fair Value | Level 2 | Commercial |    Other      
Financial assets      
Loans 0 20 5
Total Fair Value | Level 2 | Municipal      
Financial assets      
Loans 0 0 0
Total Fair Value | Level 2 | Residential | Construction      
Financial assets      
Loans 0 0 0
Total Fair Value | Level 2 | Residential | Term      
Financial assets      
Loans 285 0 0
Total Fair Value | Level 2 | Home Equity      
Financial assets      
Loans 0 0 0
Total Fair Value | Level 2 | Consumer      
Financial assets      
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
Loans 1,919,872 1,809,658 1,765,520
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      
Loans 652,297 669,752 615,560
Total Fair Value | Level 3 | Commercial | Construction      
Financial assets      
Loans 67,144 89,934 124,366
Total Fair Value | Level 3 | Commercial |    Other      
Financial assets      
Loans 423,464 312,199 304,019
Total Fair Value | Level 3 | Municipal      
Financial assets      
Loans 52,196 38,069 46,475
Total Fair Value | Level 3 | Residential | Construction      
Financial assets      
Loans 27,972 44,410 37,263
Total Fair Value | Level 3 | Residential | Term      
Financial assets      
Loans 577,697 558,274 543,378
Total Fair Value | Level 3 | Home Equity      
Financial assets      
Loans 102,124 78,878 76,287
Total Fair Value | Level 3 | Consumer      
Financial assets      
Loans $ 16,978 $ 18,142 $ 18,172