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Fair Value - Carrying Amounts and Estimated Fair Values (Details) - USD ($)
$ in Thousands
Jun. 30, 2022
Dec. 31, 2021
Jun. 30, 2021
Financial assets      
Securities to be held to maturity $ 335,950 $ 375,327 $ 383,454
Mortgage servicing rights 3,751 3,041 2,777
Financial liabilities      
Local certificates of deposit 704,410 566,205 596,202
Total deposits 2,252,022 2,123,297 1,961,321
Level 1      
Financial liabilities      
Local certificates of deposit 0    
Level 2      
Financial liabilities      
Local certificates of deposit 246,032    
Level 3      
Financial liabilities      
Local certificates of deposit 0    
Carrying value      
Financial assets      
Securities to be held to maturity 379,693 370,040 376,181
Loans 1,772,843 1,632,962 1,572,377
Mortgage servicing rights 2,644 2,671 2,548
Financial liabilities      
Local certificates of deposit 254,717 232,724 243,447
National certificates of deposit 449,693 333,481 352,755
Total deposits 704,410 566,205 596,202
Repurchase agreements 71,501 81,251 83,554
Federal Home Loan Bank advances 55,087 55,091 145,094
Total borrowed funds 126,588 136,342 228,648
Carrying value | Commercial |    Real estate      
Financial assets      
Loans 611,302 570,134 520,803
Carrying value | Commercial |    Construction      
Financial assets      
Loans 127,628 78,522 64,980
Carrying value | Commercial |    Other      
Financial assets      
Loans 272,386 261,373 294,669
Carrying value | Municipal      
Financial assets      
Loans 46,658 48,185 40,876
Carrying value | Residential |    Construction      
Financial assets      
Loans 43,795 31,596 29,644
Carrying value | Residential |    Term      
Financial assets      
Loans 580,076 548,530 521,347
Carrying value | Home equity line of credit      
Financial assets      
Loans 70,620 72,587 76,668
Carrying value | Consumer      
Financial assets      
Loans 20,378 22,035 23,390
Total Fair Value      
Financial assets      
Securities to be held to maturity 335,950 375,327 383,454
Loans 1,739,099 1,637,145 1,567,081
Mortgage servicing rights 3,751 3,041 2,777
Financial liabilities      
Local certificates of deposit 246,032 231,265 244,558
National certificates of deposit 441,369 337,025 356,258
Total deposits 687,401 568,290 600,816
Repurchase agreements 71,448 79,065 82,220
Federal Home Loan Bank advances 55,072 55,998 146,637
Total borrowed funds 126,520 135,063 228,857
Total Fair Value | Commercial |    Real estate      
Financial assets      
Loans 610,394 570,187 515,609
Total Fair Value | Commercial |    Construction      
Financial assets      
Loans 127,438 78,529 64,332
Total Fair Value | Commercial |    Other      
Financial assets      
Loans 272,521 261,759 294,902
Total Fair Value | Municipal      
Financial assets      
Loans 47,414 48,634 40,625
Total Fair Value | Residential |    Construction      
Financial assets      
Loans 40,690 31,966 30,013
Total Fair Value | Residential |    Term      
Financial assets      
Loans 548,022 553,098 525,325
Total Fair Value | Home equity line of credit      
Financial assets      
Loans 73,594 72,381 74,713
Total Fair Value | Consumer      
Financial assets      
Loans 19,026 20,591 21,562
Total Fair Value | Level 1      
Financial assets      
Securities to be held to maturity 0 0 0
Loans 0 0 0
Mortgage servicing rights 0 0 0
Financial liabilities      
Local certificates of deposit   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 line of credit      
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 335,950 375,327 383,454
Loans 5 224 189
Mortgage servicing rights 3,751 3,041 2,777
Financial liabilities      
Local certificates of deposit   231,265 244,558
National certificates of deposit 441,369 337,025 356,258
Total deposits 687,401 568,290 600,816
Repurchase agreements 71,448 79,065 82,220
Federal Home Loan Bank advances 55,072 55,998 146,637
Total borrowed funds 126,520 135,063 228,857
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 5 5 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 0 219 184
Total Fair Value | Level 2 | Home equity line of credit      
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 0 0 0
Loans 1,739,094 1,636,921 1,566,892
Mortgage servicing rights 0 0 0
Financial liabilities      
Local certificates of deposit   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 610,394 570,187 515,609
Total Fair Value | Level 3 | Commercial |    Construction      
Financial assets      
Loans 127,438 78,529 64,332
Total Fair Value | Level 3 | Commercial |    Other      
Financial assets      
Loans 272,516 261,754 294,897
Total Fair Value | Level 3 | Municipal      
Financial assets      
Loans 47,414 48,634 40,625
Total Fair Value | Level 3 | Residential |    Construction      
Financial assets      
Loans 40,690 31,966 30,013
Total Fair Value | Level 3 | Residential |    Term      
Financial assets      
Loans 548,022 552,879 525,141
Total Fair Value | Level 3 | Home equity line of credit      
Financial assets      
Loans 73,594 72,381 74,713
Total Fair Value | Level 3 | Consumer      
Financial assets      
Loans $ 19,026 $ 20,591 $ 21,562