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Borrowed Funds - Short-term Borrowings, Long-term borrowings and Repurchase Agreements (Details) - USD ($)
 9 Months Ended 12 Months Ended
Sep. 30, 2023
Dec. 31, 2022
Borrowed funds    
FHLB maximum borrowing capacity $ 721,200,000  
FHLB, remaining borrowing capacity 707,800,000  
FHLB, deposit letters of credit 11,900,000  
FHLB, credit enhancement recourse obligations 1,400,000  
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 0 102,333,000
Average balance during the period 23,449,000 15,494,000
Maximum month-end balance $ 0 $ 102,333,000
Weighted-average rate during the period 5.06% 2.82%
Weighted-average rate at end of period 0.00% 4.45%
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 4,600,000 10,400,000
Repurchase Agreements    
Short-term Borrowings and Repurchase Agreements    
Balance at end of period 4,502,000 10,037,000
Average balance during the period 5,974,000 10,987,000
Maximum month-end balance $ 10,041,000 $ 12,680,000
Weighted-average rate during the period 0.00% 0.05%
Weighted-average rate at end of period 0.01% 0.06%