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Borrowed Funds - Short-term Borrowings (Details) - USD ($)
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Borrowed funds    
Maximum borrowing capacity with the FHLB $ 712,900,000  
Remaining maximum borrowing capacity with the FHLB 699,800,000  
FHLB, deposit letters of credit 11,900,000  
FHLB, credit enhancement recourse obligations 1,200,000  
Short-term Borrowings from FHLB    
Short-term Borrowings    
Balance at end of year 0 $ 102,333,000
Average balance during the year 17,542,000 15,494,000
Maximum month-end balance $ 0 $ 102,333,000
Weighted-average rate during the year 5.07% 2.82%
Weighted-average rate at December 31 0.00% 4.45%
Federal Funds Purchased    
Short-term Borrowings    
Balance at end of year $ 0 $ 0