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Loans - Narrative (Details)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2024
USD ($)
modified_loan
loan
Mar. 31, 2023
USD ($)
Dec. 31, 2023
USD ($)
loan
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]      
Accrued interest receivable for loans | $ $ 8,800   $ 8,800
Outstanding balance of high risk loans, minimum | $ 500    
Interest income | $ $ 55 $ 154  
Loan contracts restructured | modified_loan 3    
Number of loans that subsequently defaulted | loan 0   0
Commercial, financial & agricultural | Term Extension and Payment Delay      
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]      
Term extension from modification 5 years    
Commercial real estate | Term Extension      
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]      
Loan contracts restructured | modified_loan 2    
Term extension from modification 1 year    
Commercial real estate | Term Extension and Payment Delay      
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]      
Loan contracts restructured | modified_loan 1