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Borrowed Funds - Short-term Borrowings, Long-term borrowings and Repurchase Agreements (Details) - USD ($)
 3 Months Ended 12 Months Ended
Mar. 31, 2024
Dec. 31, 2023
Borrowed funds    
FHLB maximum borrowing capacity $ 697,000,000  
FHLB, remaining borrowing capacity 683,900,000  
FHLB, deposit letters of credit 11,900,000  
FHLB, credit enhancement recourse obligations 1,200,000  
Short-term Borrowings and Repurchase Agreements    
Long-term notes from the FHLB 0 $ 0
Short-term Borrowings from FHLB    
Short-term Borrowings and Repurchase Agreements    
Balance at end of period 0 0
Average balance during the period 44,000 17,542,000
Maximum month-end balance $ 0 $ 0
Weighted-average rate during the period 9.14% 5.07%
Weighted-average rate at end of period 0.00% 0.00%
Federal Funds Purchased    
Short-term Borrowings and Repurchase Agreements    
Balance at end of period $ 0 $ 0
Investment Securities    
Short-term Borrowings and Repurchase Agreements    
Investment securities held as collateral 3,900,000 4,900,000
Repurchase Agreements    
Short-term Borrowings and Repurchase Agreements    
Balance at end of period 3,810,000 4,821,000
Average balance during the period 2,951,000 5,662,000
Maximum month-end balance $ 3,810,000 $ 10,041,000
Weighted-average rate during the period 0.01% 0.02%
Weighted-average rate at end of period 0.01% 0.01%