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Borrowed Funds - Short-term Borrowings, Long-term borrowings and Repurchase Agreements (Details) - USD ($)
 6 Months Ended 12 Months Ended
Jun. 30, 2024
Dec. 31, 2023
Borrowed funds    
FHLB maximum borrowing capacity $ 692,900,000  
FHLB, remaining borrowing capacity 665,800,000  
FHLB, deposit letters of credit 25,900,000  
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 22,000 17,542,000
Maximum month-end balance $ 0 $ 0
Weighted-average rate during the period 5.98% 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 2,400,000 4,900,000
Repurchase Agreements    
Short-term Borrowings and Repurchase Agreements    
Balance at end of period 2,366,000 4,821,000
Average balance during the period 3,205,000 5,662,000
Maximum month-end balance $ 4,242,000 $ 10,041,000
Weighted-average rate during the period 0.31% 0.02%
Weighted-average rate at end of period 1.22% 0.01%