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Loans and Allowance for Credit Losses - Collateral Loan (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | --- | --- | ---
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Loans held for investment | $ 1,539,147 |  | $ 1,521,252 |  |  |
Increase in liability for unfunded commitments | 23,744 | [1] | 15,588 | [1] | $ 16,903 | $ 18,113
Commercial, Financial, and Agricultural |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Loans held for investment | 226,275 |  | 244,549 |  |  |
Increase in liability for unfunded commitments | 3,208 |  | 2,735 |  | 2,717 | 5,121
Real Estate Construction - Residential |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Loans held for investment | 58,347 |  | 32,095 |  |  |
Increase in liability for unfunded commitments | 1,043 |  | 157 |  | 137 | 213
Real estate mortgage − residential |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Loans held for investment | 372,391 |  | 361,025 |  |  |
Increase in liability for unfunded commitments | 5,264 |  | 3,329 |  | 2,482 | 2,679
Real estate mortgage − commercial |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Loans held for investment | 731,024 |  | 722,729 |  |  |
Increase in liability for unfunded commitments | 10,537 |  | $ 8,000 |  | $ 10,662 | $ 9,354
Real Estate |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Loans held for investment | 2,847 |  |  |  |  |
Real Estate | Commercial, Financial, and Agricultural |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Loans held for investment | 0 |  |  |  |  |
Real Estate | Real Estate Construction - Residential |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Loans held for investment | 432 |  |  |  |  |
Real Estate | Real estate mortgage − residential |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Loans held for investment | 46 |  |  |  |  |
Real Estate | Real estate mortgage − commercial |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Loans held for investment | 2,369 |  |  |  |  |
Other |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Loans held for investment | 2,221 |  |  |  |  |
Other | Commercial, Financial, and Agricultural |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Loans held for investment | 2,221 |  |  |  |  |
Other | Real Estate Construction - Residential |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Loans held for investment | 0 |  |  |  |  |
Other | Real estate mortgage − residential |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Loans held for investment | 0 |  |  |  |  |
Other | Real estate mortgage − commercial |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Loans held for investment | 0 |  |  |  |  |
Allowance Allocated |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Increase in liability for unfunded commitments | 1,483 |  |  |  |  |
Allowance Allocated | Commercial, Financial, and Agricultural |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Increase in liability for unfunded commitments | 1,300 |  |  |  |  |
Allowance Allocated | Real Estate Construction - Residential |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Increase in liability for unfunded commitments | 164 |  |  |  |  |
Allowance Allocated | Real estate mortgage − residential |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Increase in liability for unfunded commitments | 19 |  |  |  |  |
Allowance Allocated | Real estate mortgage − commercial |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Increase in liability for unfunded commitments | $ 0 |  |  |  |  |
[1] | December 31, 2023 amounts include the impacts of the January 1, 2023 adoption of ASU 2016-13. See Note 2 for details.

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