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Fair Value - Carrying Amounts and Estimated Fair Values (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Mar. 31, 2021
Financial assets      
Securities to be held to maturity $ 353,191 $ 375,327 $ 388,836
Mortgage servicing rights 3,435 3,041 2,608
Financial liabilities      
Local certificates of deposit 609,947 566,205 634,330
Total deposits 2,158,539 2,123,297 1,953,557
Level 1      
Financial liabilities      
Local certificates of deposit 0    
Level 2      
Financial liabilities      
Local certificates of deposit 223,383    
Level 3      
Financial liabilities      
Local certificates of deposit 0    
Carrying value      
Financial assets      
Securities to be held to maturity 377,183 370,040 385,352
Loans 1,691,982 1,632,962 1,503,700
Mortgage servicing rights 2,676 2,671  
Financial liabilities      
Local certificates of deposit 229,055 232,724 246,976
National certificates of deposit 380,892 333,481 387,354
Total deposits 609,947 566,205 634,330
Repurchase agreements 78,623 81,251 71,952
Federal Home Loan Bank advances 55,089 55,091 157,696
Total borrowed funds 133,712 136,342 229,648
Carrying value | Commercial |    Real estate      
Financial assets      
Loans 582,270 570,134 463,854
Carrying value | Commercial |    Construction      
Financial assets      
Loans 101,927 78,522 52,702
Carrying value | Commercial |    Other      
Financial assets      
Loans 264,345 261,373 293,139
Carrying value | Municipal      
Financial assets      
Loans 50,692 48,185 49,279
Carrying value | Residential |    Construction      
Financial assets      
Loans 36,091 31,596 24,656
Carrying value | Residential |    Term      
Financial assets      
Loans 563,745 548,530 520,682
Carrying value | Home equity line of credit      
Financial assets      
Loans 71,808 72,587 76,201
Carrying value | Consumer      
Financial assets      
Loans 21,104 22,035 23,187
Total Fair Value      
Financial assets      
Securities to be held to maturity 353,191 375,327 388,836
Loans 1,668,531 1,637,145 1,496,844
Mortgage servicing rights 3,435 3,041 2,608
Financial liabilities      
Local certificates of deposit 223,383 231,265 249,458
National certificates of deposit 377,302 337,025 359,899
Total deposits 600,685 568,290 609,357
Repurchase agreements 72,990 79,065 70,105
Federal Home Loan Bank advances 55,399 55,998 159,184
Total borrowed funds 128,389 135,063 229,289
Total Fair Value | Commercial |    Real estate      
Financial assets      
Loans 580,407 570,187 459,158
Total Fair Value | Commercial |    Construction      
Financial assets      
Loans 101,601 78,529 52,168
Total Fair Value | Commercial |    Other      
Financial assets      
Loans 263,502 261,759 289,541
Total Fair Value | Municipal      
Financial assets      
Loans 51,015 48,634 48,698
Total Fair Value | Residential |    Construction      
Financial assets      
Loans 34,873 31,966 25,028
Total Fair Value | Residential |    Term      
Financial assets      
Loans 547,611 553,098 526,134
Total Fair Value | Home equity line of credit      
Financial assets      
Loans 70,029 72,381 74,813
Total Fair Value | Consumer      
Financial assets      
Loans 19,493 20,591 21,304
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 353,191 375,327 388,836
Loans 200 224 234
Mortgage servicing rights 3,435 3,041 2,608
Financial liabilities      
Local certificates of deposit   231,265 249,458
National certificates of deposit 377,302 337,025 359,899
Total deposits 600,685 568,290 609,357
Repurchase agreements 72,990 79,065 70,105
Federal Home Loan Bank advances 55,399 55,998 159,184
Total borrowed funds 128,389 135,063 229,289
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 50
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 102 219 184
Total Fair Value | Level 2 | Home equity line of credit      
Financial assets      
Loans 93 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 1,668,331 1,636,921 1,496,610
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 580,407 570,187 459,158
Total Fair Value | Level 3 | Commercial |    Construction      
Financial assets      
Loans 101,601 78,529 52,168
Total Fair Value | Level 3 | Commercial |    Other      
Financial assets      
Loans 263,497 261,754 289,491
Total Fair Value | Level 3 | Municipal      
Financial assets      
Loans 51,015 48,634 48,698
Total Fair Value | Level 3 | Residential |    Construction      
Financial assets      
Loans 34,873 31,966 25,028
Total Fair Value | Level 3 | Residential |    Term      
Financial assets      
Loans 547,509 552,879 525,950
Total Fair Value | Level 3 | Home equity line of credit      
Financial assets      
Loans 69,936 72,381 74,813
Total Fair Value | Level 3 | Consumer      
Financial assets      
Loans $ 19,493 $ 20,591 $ 21,304