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Fair Value - Carrying Amounts and Estimated Fair Values (Details) - USD ($)
$ in Thousands
Sep. 30, 2022
Dec. 31, 2021
Sep. 30, 2021
Financial assets      
Securities to be held to maturity $ 313,796 $ 375,327 $ 379,797
Mortgage servicing rights 3,789 3,041 2,757
Financial liabilities      
Local certificates of deposit 786,176 566,205 514,567
Total deposits 2,369,949 2,123,297 2,033,213
Level 1      
Financial liabilities      
Local certificates of deposit 0    
Level 2      
Financial liabilities      
Local certificates of deposit 239,377    
Level 3      
Financial liabilities      
Local certificates of deposit 0    
Carrying value      
Financial assets      
Securities to be held to maturity 381,906 370,040 375,699
Loans 1,841,588 1,632,962 1,601,142
Mortgage servicing rights 2,594 2,671 2,597
Financial liabilities      
Local certificates of deposit 252,211 232,724 238,170
National certificates of deposit 533,965 333,481 276,397
Total deposits 786,176 566,205 514,567
Repurchase agreements 68,258 81,251 88,109
Federal Home Loan Bank advances 50,085 55,091 145,092
Total borrowed funds 118,343 136,342 233,201
Carrying value | Commercial |    Real estate      
Financial assets      
Loans 632,385 570,134 542,975
Carrying value | Commercial |    Construction      
Financial assets      
Loans 127,765 78,522 72,341
Carrying value | Commercial |    Other      
Financial assets      
Loans 306,692 261,373 284,048
Carrying value | Municipal      
Financial assets      
Loans 48,521 48,185 40,409
Carrying value | Residential |    Construction      
Financial assets      
Loans 41,440 31,596 29,203
Carrying value | Residential |    Term      
Financial assets      
Loans 592,143 548,530 536,231
Carrying value | Home equity line of credit      
Financial assets      
Loans 72,812 72,587 73,549
Carrying value | Consumer      
Financial assets      
Loans 19,830 22,035 22,386
Total Fair Value      
Financial assets      
Securities to be held to maturity 313,796 375,327 379,797
Loans 1,765,525 1,637,145 1,595,673
Mortgage servicing rights 3,789 3,041 2,757
Financial liabilities      
Local certificates of deposit 239,377 231,265 239,239
National certificates of deposit 525,169 337,025 279,653
Total deposits 764,546 568,290 518,892
Repurchase agreements 59,208 79,065 86,114
Federal Home Loan Bank advances 50,071 55,998 146,411
Total borrowed funds 109,279 135,063 232,525
Total Fair Value | Commercial |    Real estate      
Financial assets      
Loans 615,560 570,187 537,937
Total Fair Value | Commercial |    Construction      
Financial assets      
Loans 124,366 78,529 71,670
Total Fair Value | Commercial |    Other      
Financial assets      
Loans 304,024 261,759 283,585
Total Fair Value | Municipal      
Financial assets      
Loans 46,475 48,634 40,133
Total Fair Value | Residential |    Construction      
Financial assets      
Loans 37,263 31,966 29,593
Total Fair Value | Residential |    Term      
Financial assets      
Loans 543,378 553,098 540,586
Total Fair Value | Home equity line of credit      
Financial assets      
Loans 76,287 72,381 71,591
Total Fair Value | Consumer      
Financial assets      
Loans 18,172 20,591 20,578
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 313,796 375,327 379,797
Loans 5 224 224
Mortgage servicing rights 3,789 3,041 2,757
Financial liabilities      
Local certificates of deposit   231,265 239,239
National certificates of deposit 525,169 337,025 279,653
Total deposits 764,546 568,290 518,892
Repurchase agreements 59,208 79,065 86,114
Federal Home Loan Bank advances 50,071 55,998 146,411
Total borrowed funds 109,279 135,063 232,525
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 0 219 219
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 1,765,520 1,636,921 1,595,449
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 615,560 570,187 537,937
Total Fair Value | Level 3 | Commercial |    Construction      
Financial assets      
Loans 124,366 78,529 71,670
Total Fair Value | Level 3 | Commercial |    Other      
Financial assets      
Loans 304,019 261,754 283,580
Total Fair Value | Level 3 | Municipal      
Financial assets      
Loans 46,475 48,634 40,133
Total Fair Value | Level 3 | Residential |    Construction      
Financial assets      
Loans 37,263 31,966 29,593
Total Fair Value | Level 3 | Residential |    Term      
Financial assets      
Loans 543,378 552,879 540,367
Total Fair Value | Level 3 | Home equity line of credit      
Financial assets      
Loans 76,287 72,381 71,591
Total Fair Value | Level 3 | Consumer      
Financial assets      
Loans $ 18,172 $ 20,591 $ 20,578