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Securities (Details Textual)
 3 Months Ended 6 Months Ended 9 Months Ended
Sep. 30, 2023
USD ($)
security
Jun. 30, 2022
Sep. 30, 2023
USD ($)
security
Dec. 31, 2022
USD ($)
Debt Securities, Available-for-Sale [Line Items]        
Held-to-maturity, debt securities, allowance for credit loss $ 321,000   $ 321,000  
Available-for-sale securities, gross realized gain (loss) 0   0  
Continuous unrealized loss position, fair value $ 605,900,000   $ 605,900,000 $ 527,400,000
Continuous unrealized loss position, fair value (as a percent)   94.00% 93.00%  
Number of securities in portfolio | security 504   504  
Securities in unrealized loss position | security 488   488  
Accrued interest, available for sale $ 2,300,000   $ 2,300,000  
Accrued interest, held to maturity $ 1,100,000   $ 1,100,000  
Cumulative Effect, Period of Adoption, Adjustment        
Debt Securities, Available-for-Sale [Line Items]        
Held-to-maturity, debt securities, allowance for credit loss       $ 300,000