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Securities - Available-for-Sale and Held-to-Maturity by Contractual Maturity (Details) - USD ($)
$ in Thousands
Sep. 30, 2023
Mar. 31, 2023
Dec. 31, 2022
Sep. 30, 2022
Mar. 31, 2022
Dec. 31, 2021
Securities held-to-maturity, Amortized Cost, Due after ten years $ 66,353          
Securities, held-to-maturity, Amortized Cost 74,213          
Securities held-to-maturity, Allowance for credit losses (1,082) $ (1,079) $ (1,100) $ (1,096) $ (1,085) $ (862)
Securities held-to-maturity 73,131   73,711      
Securities held-to-maturity, Fair Value, Due after ten years 51,031          
Debt Securities, Held-to-maturity, Fair Value, Total 57,665   62,550      
Securities available-for-sale, Amortized Cost, Due in one year or less 59,934          
Securities available-for-sale, Amortized Cost, Due after one years through five years 84,849          
Securities available-for-sale, Amortized Cost, Due after five years through ten years 244,126          
Securities available-for-sale, Amortized Cost, Due after ten years 129,445          
Securities available-for-sale 951,240          
Securities available for sale, Fair Value, Due in one year or less 58,951          
Securities available for sale, Fair Value, Due after one years through five years 79,070          
Securities available for sale, Fair Value, Due after five years through ten years 227,135          
Securities available for sale, Fair Value, Due after ten years 129,562          
Securities, available-for-sale, Fair Value 843,663   735,357      
Basis adjustments 10,639          
Designated as Hedging Instrument [Member] | Portfolio Layer Hedges on Closed Portfolio of Securities Available for Sale [Member]            
Basis adjustments 7,700          
Total Other Securities [Member]            
Securities, held-to-maturity, Amortized Cost, With single maturity date 66,353          
Securities held-to-maturity, Fair Value, With single maturity date 51,031          
Securities available-for-sale, Amortized Cost, With single maturity date 518,354          
Securities available-for-sale, Fair Value, With single maturity date 494,718          
Collateralized Mortgage Backed Securities            
Securities held-to-maturity, Amortized Cost, Without single maturity 7,860          
Securities, held-to-maturity, Amortized Cost 7,860   7,875      
Securities held-to-maturity, Fair Value, Without single maturity date 6,634          
Debt Securities, Held-to-maturity, Fair Value, Total 6,634   6,989      
Securities, available-for-sale, Amortized Cost, Without single maturity date 421,820          
Securities available-for-sale 421,820          
Securities available-for-sale, Fair Value, Without single maturity date 337,879          
Securities, available-for-sale, Fair Value 337,879   384,283      
Mutual Fund Debt Securities [Member]            
Securities, available-for-sale, Amortized Cost, Without single maturity date 11,066          
Securities available-for-sale 11,066          
Securities available-for-sale, Fair Value, Without single maturity date 11,066          
Securities, available-for-sale, Fair Value $ 11,066   $ 11,211