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Loans and Allowance for Credit Losses - Related Party Loans (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2024
Dec. 31, 2023
Receivables [Abstract]    
Beginning balance on January 1 $ 292 $ 547
New loans 1 64
Repayments (3) (319)
Ending balance $ 290 $ 292