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Commitments and Contingencies (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Commitments, Contingencies and Guarantees [Line Items]      
Off-balance-sheet credit exposure $ 3,200 $ 3,600  
Off-balance-sheet, liability, credit loss expense (reversal) (318)    
Cumulative Effect, Period of Adoption, Adjustment      
Commitments, Contingencies and Guarantees [Line Items]      
Off-balance-sheet credit exposure     $ 3,100
Financial Standby Letters of Credit      
Commitments, Contingencies and Guarantees [Line Items]      
Commitments to extend credit $ 61,400 $ 62,200