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Loans and Allowance for Credit Losses - Amortized Cost and Unpaid Principal of Loans (Details) - USD ($) $ in Thousands | Jun. 30, 2022 | Mar. 31, 2022 | Dec. 31, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | --- | --- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Amortized Cost | $ 1,405,709 |  | $ 1,413,886 |  |  |
Allowance for credit losses | (11,537) | $ (11,310) | (11,739) | $ (14,539) | $ (14,764) | $ (16,625)
Net loans | 1,394,172 |  | 1,402,147 |  |  |
Unpaid Principal | 1,414,005 |  | 1,425,429 |  |  |
Difference | (8,296) |  | (11,543) |  |  |
Commercial & industrial loans |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Amortized Cost | 394,841 |  | 448,338 |  |  |
Allowance for credit losses | (2,961) | (2,901) | (3,027) | (4,291) | (4,269) | (4,348)
Unpaid Principal | 397,154 |  | 454,106 |  |  |
Difference | (2,313) |  | (5,768) |  |  |
Commercial real estate | Owner occupied properties |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Amortized Cost | 313,174 |  | 300,200 |  |  |
Allowance for credit losses | (2,573) | (2,513) | (3,176) | (3,340) | (3,366) | (3,579)
Unpaid Principal | 314,761 |  | 301,623 |  |  |
Difference | (1,587) |  | (1,423) |  |  |
Commercial real estate | Non-owner occupied and multifamily properties |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Amortized Cost | 446,592 |  | 435,311 |  |  |
Allowance for credit losses | (3,107) | (3,063) | (2,930) | (3,841) | (3,704) | (4,944)
Unpaid Principal | 449,987 |  | 438,631 |  |  |
Difference | (3,395) |  | (3,320) |  |  |
Residential real estate | 1-4 family residential properties secured by first liens |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Amortized Cost | 37,298 |  | 32,542 |  |  |
Allowance for credit losses | (620) | (510) | (439) | (630) | (813) | (673)
Unpaid Principal | 37,346 |  | 32,602 |  |  |
Difference | (48) |  | (60) |  |  |
Residential real estate | 1-4 family residential properties secured by junior liens and revolving secured by 1-4 family first liens |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Amortized Cost | 21,953 |  | 19,610 |  |  |
Allowance for credit losses | (327) | (301) | (215) | (340) | (342) | (419)
Unpaid Principal | 21,821 |  | 19,489 |  |  |
Difference | 132 |  | 121 |  |  |
Residential real estate | 1-4 family residential construction loans |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Amortized Cost | 43,915 |  | 36,222 |  |  |
Allowance for credit losses | (231) | (210) | (120) | (231) | (260) | (454)
Unpaid Principal | 44,215 |  | 36,542 |  |  |
Difference | (300) |  | (320) |  |  |
Other construction, land development and raw land loans |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Amortized Cost | 87,163 |  | 88,094 |  |  |
Allowance for credit losses | (1,462) | (1,550) | (1,635) | (1,670) | (1,821) | (1,994)
Unpaid Principal | 87,669 |  | 88,604 |  |  |
Difference | (506) |  | (510) |  |  |
Obligations of states and political subdivisions in the US |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Amortized Cost | 24,005 |  | 16,403 |  |  |
Allowance for credit losses | (59) | (52) | (32) | (39) | (36) | (44)
Unpaid Principal | 24,152 |  | 16,565 |  |  |
Difference | (147) |  | (162) |  |  |
Agricultural production, including commercial fishing |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Amortized Cost | 29,482 |  | 27,959 |  |  |
Allowance for credit losses | (127) | (128) | (91) | (57) | (46) | (49)
Unpaid Principal | 29,638 |  | 28,082 |  |  |
Difference | (156) |  | (123) |  |  |
Consumer loans |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Amortized Cost | 4,092 |  | 4,801 |  |  |
Allowance for credit losses | (64) | (75) | (67) | (94) | (104) | (118)
Unpaid Principal | 4,054 |  | 4,763 |  |  |
Difference | 38 |  | 38 |  |  |
Other loans |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Amortized Cost | 3,194 |  | 4,406 |  |  |
Allowance for credit losses | (6) | $ (7) | (7) | $ (6) | $ (3) | $ (3)
Unpaid Principal | 3,208 |  | 4,422 |  |  |
Difference | $ (14) |  | $ (16) |  |  |

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