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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 |  |  |

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