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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.