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Investment Securities (Scheduled Maturities of Securities Available for Sale and Securities Held to Maturity) (Details) - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Investments [Abstract]    
Debt securities available for sale, Due in one year or less, Amortized Cost $ 2,767  
Debt securities available for sale, Due from one to five years, Amortized Cost 92,910  
Debt securities available for sale, Due after five years through ten years, Amortized Cost 137,900  
Debt securities available for sale, Due after ten years, Amortized Cost 827,604  
Securities available for sale, Amortized Cost 1,061,181 $ 1,127,057
Debt securities available for sale, Due in one year or less, Fair Value 2,707  
Debt securities available for sale, Due from one to five years, Fair Value 84,604  
Debt securities available for sale, Due after five years through ten years, Fair Value 117,404  
Debt securities available for sale, Due after ten years, Fair Value 649,500  
Debt securities available for sale, Fair Value 854,215 954,371
Debt securities held to maturity, Due in one year or less, Amortized Cost 26,552  
Debt securities held to maturity, Due from one to five years, Amortized Cost 34,730  
Debt securities held to maturity, Due after five years through ten years, Amortized Cost 30,712  
Debt securities held to maturity, Due after ten years, Amortized Cost 62,214  
Securities held to maturity, Amortized Cost 154,208 188,980
Debt securities held to maturity, Due in one year or less, Fair Value 26,156  
Debt securities held to maturity, Due from one to five years, Fair Value 33,141  
Debt securities held to maturity, Due after five years through ten years, Fair Value 26,658  
Debt securities held to maturity, Due after ten years, Fair Value 50,585  
Securities held to maturity, Fair Value $ 136,540 $ 174,188