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Fair Value Disclosures - Carrying Amounts and Estimated Fair Values (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019
--- | --- | --- | --- | --- | --- | --- | --- | ---
Financial assets |  |  |  |  |  |  |  |
Securities to be held to maturity, fair value | $ 377,134 |  |  |  | $ 287,045 |  |  |
Loans (net of allowance for loan losses) |  |  |  |  |  |  |  |
Mortgage servicing rights | 1,985 |  |  |  | 2,089 |  |  |
Financial liabilities |  |  |  |  |  |  |  |
Certificates of deposit | 605,585 |  |  |  | 689,979 |  |  |
Total deposits | 1,844,611 | $ 1,763,059 | $ 1,740,121 | $ 1,644,612 | 1,650,466 | $ 1,623,290 | $ 1,592,956 | $ 1,606,875
Level 1 |  |  |  |  |  |  |  |
Financial assets |  |  |  |  |  |  |  |
Securities to be held to maturity, fair value | 0 |  |  |  | 0 |  |  |
Loans (net of allowance for loan losses) |  |  |  |  |  |  |  |
Loans | 0 |  |  |  | 0 |  |  |
Mortgage servicing rights | 0 |  |  |  | 0 |  |  |
Financial liabilities |  |  |  |  |  |  |  |
Certificates of deposit | 0 |  |  |  | 0 |  |  |
National certificates of deposit | 0 |  |  |  | 0 |  |  |
Total deposits | 0 |  |  |  | 0 |  |  |
Repurchase agreements | 0 |  |  |  | 0 |  |  |
Other borrowed funds | 0 |  |  |  | 0 |  |  |
Total borrowed funds | 0 |  |  |  | 0 |  |  |
Level 1 | Commercial | Real estate |  |  |  |  |  |  |  |
Loans (net of allowance for loan losses) |  |  |  |  |  |  |  |
Loans | 0 |  |  |  | 0 |  |  |
Level 1 | Commercial | Construction |  |  |  |  |  |  |  |
Loans (net of allowance for loan losses) |  |  |  |  |  |  |  |
Loans | 0 |  |  |  | 0 |  |  |
Level 1 | Commercial | Other |  |  |  |  |  |  |  |
Loans (net of allowance for loan losses) |  |  |  |  |  |  |  |
Loans | 0 |  |  |  | 0 |  |  |
Level 1 | Municipal |  |  |  |  |  |  |  |
Loans (net of allowance for loan losses) |  |  |  |  |  |  |  |
Loans | 0 |  |  |  | 0 |  |  |
Level 1 | Residential | Construction |  |  |  |  |  |  |  |
Loans (net of allowance for loan losses) |  |  |  |  |  |  |  |
Loans | 0 |  |  |  | 0 |  |  |
Level 1 | Residential | Term |  |  |  |  |  |  |  |
Loans (net of allowance for loan losses) |  |  |  |  |  |  |  |
Loans | 0 |  |  |  | 0 |  |  |
Level 1 | Home equity line of credit |  |  |  |  |  |  |  |
Loans (net of allowance for loan losses) |  |  |  |  |  |  |  |
Loans | 0 |  |  |  | 0 |  |  |
Level 1 | Consumer |  |  |  |  |  |  |  |
Loans (net of allowance for loan losses) |  |  |  |  |  |  |  |
Loans | 0 |  |  |  | 0 |  |  |
Level 2 |  |  |  |  |  |  |  |
Financial assets |  |  |  |  |  |  |  |
Securities to be held to maturity, fair value | 377,134 |  |  |  | 287,045 |  |  |
Loans (net of allowance for loan losses) |  |  |  |  |  |  |  |
Loans | 794 |  |  |  | 6,579 |  |  |
Mortgage servicing rights | 1,985 |  |  |  | 2,089 |  |  |
Financial liabilities |  |  |  |  |  |  |  |
Certificates of deposit | 253,892 |  |  |  | 281,480 |  |  |
National certificates of deposit | 359,899 |  |  |  | 412,337 |  |  |
Total deposits | 613,791 |  |  |  | 693,817 |  |  |
Repurchase agreements | 69,497 |  |  |  | 37,450 |  |  |
Other borrowed funds | 194,469 |  |  |  | 140,063 |  |  |
Total borrowed funds | 263,966 |  |  |  | 177,513 |  |  |
Level 2 | Commercial | Real estate |  |  |  |  |  |  |  |
Loans (net of allowance for loan losses) |  |  |  |  |  |  |  |
Loans | 347 |  |  |  | 2 |  |  |
Level 2 | Commercial | Construction |  |  |  |  |  |  |  |
Loans (net of allowance for loan losses) |  |  |  |  |  |  |  |
Loans | 0 |  |  |  | 0 |  |  |
Level 2 | Commercial | Other |  |  |  |  |  |  |  |
Loans (net of allowance for loan losses) |  |  |  |  |  |  |  |
Loans | 5 |  |  |  | 5,046 |  |  |
Level 2 | Municipal |  |  |  |  |  |  |  |
Loans (net of allowance for loan losses) |  |  |  |  |  |  |  |
Loans | 0 |  |  |  | 0 |  |  |
Level 2 | Residential | Construction |  |  |  |  |  |  |  |
Loans (net of allowance for loan losses) |  |  |  |  |  |  |  |
Loans | 0 |  |  |  | 0 |  |  |
Level 2 | Residential | Term |  |  |  |  |  |  |  |
Loans (net of allowance for loan losses) |  |  |  |  |  |  |  |
Loans | 442 |  |  |  | 577 |  |  |
Level 2 | Home equity line of credit |  |  |  |  |  |  |  |
Loans (net of allowance for loan losses) |  |  |  |  |  |  |  |
Loans | 0 |  |  |  | 954 |  |  |
Level 2 | Consumer |  |  |  |  |  |  |  |
Loans (net of allowance for loan losses) |  |  |  |  |  |  |  |
Loans | 0 |  |  |  | 0 |  |  |
Level 3 |  |  |  |  |  |  |  |
Financial assets |  |  |  |  |  |  |  |
Securities to be held to maturity, fair value | 0 |  |  |  | 0 |  |  |
Loans (net of allowance for loan losses) |  |  |  |  |  |  |  |
Loans | 1,475,898 |  |  |  | 1,269,106 |  |  |
Mortgage servicing rights | 0 |  |  |  | 0 |  |  |
Financial liabilities |  |  |  |  |  |  |  |
Certificates of deposit | 0 |  |  |  | 0 |  |  |
National certificates of deposit | 0 |  |  |  | 0 |  |  |
Total deposits | 0 |  |  |  | 0 |  |  |
Repurchase agreements | 0 |  |  |  | 0 |  |  |
Other borrowed funds | 0 |  |  |  | 0 |  |  |
Total borrowed funds | 0 |  |  |  | 0 |  |  |
Level 3 | Commercial | Real estate |  |  |  |  |  |  |  |
Loans (net of allowance for loan losses) |  |  |  |  |  |  |  |
Loans | 440,388 |  |  |  | 364,624 |  |  |
Level 3 | Commercial | Construction |  |  |  |  |  |  |  |
Loans (net of allowance for loan losses) |  |  |  |  |  |  |  |
Loans | 56,388 |  |  |  | 37,366 |  |  |
Level 3 | Commercial | Other |  |  |  |  |  |  |  |
Loans (net of allowance for loan losses) |  |  |  |  |  |  |  |
Loans | 279,496 |  |  |  | 207,502 |  |  |
Level 3 | Municipal |  |  |  |  |  |  |  |
Loans (net of allowance for loan losses) |  |  |  |  |  |  |  |
Loans | 44,440 |  |  |  | 40,552 |  |  |
Level 3 | Residential | Construction |  |  |  |  |  |  |  |
Loans (net of allowance for loan losses) |  |  |  |  |  |  |  |
Loans | 21,890 |  |  |  | 14,786 |  |  |
Level 3 | Residential | Term |  |  |  |  |  |  |  |
Loans (net of allowance for loan losses) |  |  |  |  |  |  |  |
Loans | 532,617 |  |  |  | 490,782 |  |  |
Level 3 | Home equity line of credit |  |  |  |  |  |  |  |
Loans (net of allowance for loan losses) |  |  |  |  |  |  |  |
Loans | 77,177 |  |  |  | 90,005 |  |  |
Level 3 | Consumer |  |  |  |  |  |  |  |
Loans (net of allowance for loan losses) |  |  |  |  |  |  |  |
Loans | 23,502 |  |  |  | 23,489 |  |  |
Carrying Amount |  |  |  |  |  |  |  |
Financial assets |  |  |  |  |  |  |  |
Securities to be held to maturity, fair value | 365,613 |  |  |  | 281,606 |  |  |
Loans (net of allowance for loan losses) |  |  |  |  |  |  |  |
Loans | 1,460,508 |  |  |  | 1,285,436 |  |  |
Mortgage servicing rights | 1,956 |  |  |  | 1,546 |  |  |
Financial liabilities |  |  |  |  |  |  |  |
Certificates of deposit | 250,264 |  |  |  | 285,602 |  |  |
National certificates of deposit | 355,321 |  |  |  | 404,377 |  |  |
Total deposits | 605,585 |  |  |  | 689,979 |  |  |
Repurchase agreements | 69,340 |  |  |  | 37,450 |  |  |
Other borrowed funds | 192,698 |  |  |  | 147,505 |  |  |
Total borrowed funds | 262,038 |  |  |  | 184,955 |  |  |
Carrying Amount | Commercial | Real estate |  |  |  |  |  |  |  |
Loans (net of allowance for loan losses) |  |  |  |  |  |  |  |
Loans | 436,161 |  |  |  | 368,645 |  |  |
Carrying Amount | Commercial | Construction |  |  |  |  |  |  |  |
Loans (net of allowance for loan losses) |  |  |  |  |  |  |  |
Loans | 55,803 |  |  |  | 37,678 |  |  |
Carrying Amount | Commercial | Other |  |  |  |  |  |  |  |
Loans (net of allowance for loan losses) |  |  |  |  |  |  |  |
Loans | 281,057 |  |  |  | 215,068 |  |  |
Carrying Amount | Municipal |  |  |  |  |  |  |  |
Loans (net of allowance for loan losses) |  |  |  |  |  |  |  |
Loans | 43,586 |  |  |  | 41,258 |  |  |
Carrying Amount | Residential | Construction |  |  |  |  |  |  |  |
Loans (net of allowance for loan losses) |  |  |  |  |  |  |  |
Loans | 21,483 |  |  |  | 14,785 |  |  |
Carrying Amount | Residential | Term |  |  |  |  |  |  |  |
Loans (net of allowance for loan losses) |  |  |  |  |  |  |  |
Loans | 519,101 |  |  |  | 491,315 |  |  |
Carrying Amount | Home equity line of credit |  |  |  |  |  |  |  |
Loans (net of allowance for loan losses) |  |  |  |  |  |  |  |
Loans | 78,356 |  |  |  | 91,149 |  |  |
Carrying Amount | Consumer |  |  |  |  |  |  |  |
Loans (net of allowance for loan losses) |  |  |  |  |  |  |  |
Loans | 24,961 |  |  |  | 25,538 |  |  |
Estimate of Fair Value |  |  |  |  |  |  |  |
Financial assets |  |  |  |  |  |  |  |
Securities to be held to maturity, fair value | 377,134 |  |  |  | 287,045 |  |  |
Loans (net of allowance for loan losses) |  |  |  |  |  |  |  |
Loans | 1,476,692 |  |  |  | 1,275,685 |  |  |
Mortgage servicing rights | 1,985 |  |  |  | 2,089 |  |  |
Financial liabilities |  |  |  |  |  |  |  |
Certificates of deposit | 253,892 |  |  |  | 281,480 |  |  |
National certificates of deposit | 359,899 |  |  |  | 412,337 |  |  |
Total deposits | 613,791 |  |  |  | 693,817 |  |  |
Repurchase agreements | 69,497 |  |  |  | 37,450 |  |  |
Other borrowed funds | 194,469 |  |  |  | 140,063 |  |  |
Total borrowed funds | 263,966 |  |  |  | 177,513 |  |  |
Estimate of Fair Value | Commercial | Real estate |  |  |  |  |  |  |  |
Loans (net of allowance for loan losses) |  |  |  |  |  |  |  |
Loans | 440,735 |  |  |  | 364,626 |  |  |
Estimate of Fair Value | Commercial | Construction |  |  |  |  |  |  |  |
Loans (net of allowance for loan losses) |  |  |  |  |  |  |  |
Loans | 56,388 |  |  |  | 37,366 |  |  |
Estimate of Fair Value | Commercial | Other |  |  |  |  |  |  |  |
Loans (net of allowance for loan losses) |  |  |  |  |  |  |  |
Loans | 279,501 |  |  |  | 212,548 |  |  |
Estimate of Fair Value | Municipal |  |  |  |  |  |  |  |
Loans (net of allowance for loan losses) |  |  |  |  |  |  |  |
Loans | 44,440 |  |  |  | 40,552 |  |  |
Estimate of Fair Value | Residential | Construction |  |  |  |  |  |  |  |
Loans (net of allowance for loan losses) |  |  |  |  |  |  |  |
Loans | 21,890 |  |  |  | 14,786 |  |  |
Estimate of Fair Value | Residential | Term |  |  |  |  |  |  |  |
Loans (net of allowance for loan losses) |  |  |  |  |  |  |  |
Loans | 533,059 |  |  |  | 491,359 |  |  |
Estimate of Fair Value | Home equity line of credit |  |  |  |  |  |  |  |
Loans (net of allowance for loan losses) |  |  |  |  |  |  |  |
Loans | 77,177 |  |  |  | 90,959 |  |  |
Estimate of Fair Value | Consumer |  |  |  |  |  |  |  |
Loans (net of allowance for loan losses) |  |  |  |  |  |  |  |
Loans | $ 23,502 |  |  |  | $ 23,489 |  |  |

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