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Loans and Allowance for Credit Losses - Amortized Cost and Unpaid Principal of Loans (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Jun. 30, 2023 | Dec. 31, 2022 | Sep. 30, 2022 | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | --- | --- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Amortized Cost | $ 1,720,091 |  | $ 1,501,785 |  |  |
Allowance for credit losses | (16,491) | $ (15,645) | (13,838) | $ (11,982) | $ (11,537) | $ (11,739)
Net loans | 1,703,600 |  | 1,487,947 |  |  |
Unpaid Principal | 1,728,377 |  | 1,510,395 |  |  |
Difference | (8,286) |  | (8,610) |  |  |
Commercial & industrial loans |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Amortized Cost | 415,898 |  | 358,128 |  |  |
Allowance for credit losses | (3,453) | (3,418) | (2,914) | (2,897) | (2,961) | (3,027)
Unpaid Principal | 417,695 |  | 359,900 |  |  |
Difference | (1,797) |  | (1,772) |  |  |
Commercial real estate | Owner occupied properties |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Amortized Cost | 357,455 |  | 349,973 |  |  |
Allowance for credit losses | (2,792) | (2,807) | (3,094) | (2,760) | (2,573) | (3,176)
Unpaid Principal | 359,019 |  | 351,580 |  |  |
Difference | (1,564) |  | (1,607) |  |  |
Commercial real estate | Non-owner occupied and multifamily properties |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Amortized Cost | 506,256 |  | 482,270 |  |  |
Allowance for credit losses | (3,224) | (3,260) | (3,615) | (3,227) | (3,107) | (2,930)
Unpaid Principal | 509,939 |  | 486,021 |  |  |
Difference | (3,683) |  | (3,751) |  |  |
Residential real estate | 1-4 family residential properties secured by first liens |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Amortized Cost | 180,849 |  | 73,381 |  |  |
Allowance for credit losses | (3,540) | (3,206) | (1,413) | (698) | (620) | (439)
Unpaid Principal | 180,719 |  | 73,674 |  |  |
Difference | 130 |  | (293) |  |  |
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 | 27,535 |  | 20,259 |  |  |
Allowance for credit losses | (506) | (423) | (389) | (366) | (327) | (215)
Unpaid Principal | 27,342 |  | 20,103 |  |  |
Difference | 193 |  | 156 |  |  |
Residential real estate | 1-4 family residential construction loans |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Amortized Cost | 32,185 |  | 44,000 |  |  |
Allowance for credit losses | (175) | (206) | (312) | (281) | (231) | (120)
Unpaid Principal | 32,374 |  | 44,314 |  |  |
Difference | (189) |  | (314) |  |  |
Other construction, land development and raw land loans |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Amortized Cost | 119,716 |  | 99,182 |  |  |
Allowance for credit losses | (2,476) | (1,996) | (1,803) | (1,477) | (1,462) | (1,635)
Unpaid Principal | 120,909 |  | 100,075 |  |  |
Difference | (1,193) |  | (893) |  |  |
Obligations of states and political subdivisions in the US |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Amortized Cost | 30,463 |  | 32,539 |  |  |
Allowance for credit losses | (77) | (88) | (79) | (63) | (59) | (32)
Unpaid Principal | 30,465 |  | 32,540 |  |  |
Difference | (2) |  | (1) |  |  |
Agricultural production, including commercial fishing |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Amortized Cost | 40,923 |  | 34,099 |  |  |
Allowance for credit losses | (164) | (162) | (145) | (140) | (127) | (91)
Unpaid Principal | 41,143 |  | 34,263 |  |  |
Difference | (220) |  | (164) |  |  |
Consumer loans |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Amortized Cost | 5,986 |  | 4,335 |  |  |
Allowance for credit losses | (79) | (74) | (68) | (66) | (64) | (67)
Unpaid Principal | 5,930 |  | 4,293 |  |  |
Difference | 56 |  | 42 |  |  |
Other loans |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Amortized Cost | 2,825 |  | 3,619 |  |  |
Allowance for credit losses | (5) | $ (5) | (6) | $ (7) | $ (6) | $ (7)
Unpaid Principal | 2,842 |  | 3,632 |  |  |
Difference | $ (17) |  | $ (13) |  |  |

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