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Securities - Available-for-Sale and Held-to-Maturity by Contractual Maturity (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | --- | --- | ---
Securities held-to-maturity, Amortized Cost, Due after ten years | $ 66,155 |  |  |
Securities, held-to-maturity, Amortized Cost | 74,010 | $ 74,811 |  |
Securities held-to-maturity, Allowance for credit losses | (1,087) | (1,100) | $ (862) | $ (907)
Securities held-to-maturity | 72,923 | 73,711 |  |
Securities held-to-maturity, Fair Value, Due after ten years | 58,697 |  |  |
Debt Securities, Held-to-maturity, Fair Value, Total | 65,755 | 62,550 |  |
Securities available-for-sale, Amortized Cost, Due in one year or less | 59,979 |  |  |
Securities available-for-sale, Amortized Cost, Due after one years through five years | 105,056 |  |  |
Securities available-for-sale, Amortized Cost, Due after five years through ten years | 222,684 |  |  |
Securities available-for-sale, Amortized Cost, Due after ten years | 139,050 |  |  |
Securities available-for-sale | 956,418 |  |  |
Securities available for sale, Fair Value, Due in one year or less | 59,485 |  |  |
Securities available for sale, Fair Value, Due after one years through five years | 99,599 |  |  |
Securities available for sale, Fair Value, Due after five years through ten years | 209,728 |  |  |
Securities available for sale, Fair Value, Due after ten years | 139,937 |  |  |
Securities, available-for-sale, Fair Value | 874,753 | 735,357 |  |
Basis adjustments | 949 |  |  |
Designated as Hedging Instrument [Member] | Portfolio Layer Hedges on Closed Portfolio of Securities Available for Sale [Member] |  |  |  |
Basis adjustments | 2,300 |  |  |
Total Other Securities [Member] |  |  |  |
Securities, held-to-maturity, Amortized Cost, With single maturity date | 66,155 |  |  |
Securities held-to-maturity, Fair Value, With single maturity date | 58,697 |  |  |
Securities available-for-sale, Amortized Cost, With single maturity date | 526,769 |  |  |
Securities available-for-sale, Fair Value, With single maturity date | 508,749 |  |  |
Collateralized Mortgage Backed Securities |  |  |  |
Securities held-to-maturity, Amortized Cost, Without single maturity | 7,855 |  |  |
Securities, held-to-maturity, Amortized Cost | 7,855 | 7,875 |  |
Securities held-to-maturity, Fair Value, Without single maturity date | 7,058 |  |  |
Debt Securities, Held-to-maturity, Fair Value, Total | 7,058 | 6,989 |  |
Securities, available-for-sale, Amortized Cost, Without single maturity date | 417,989 |  |  |
Securities available-for-sale | 417,989 |  |  |
Securities available-for-sale, Fair Value, Without single maturity date | 354,344 |  |  |
Securities, available-for-sale, Fair Value | 354,344 | 384,283 |  |
Mutual Fund Debt Securities [Member] |  |  |  |
Securities, available-for-sale, Amortized Cost, Without single maturity date | 11,660 |  |  |
Securities available-for-sale | 11,660 |  |  |
Securities available-for-sale, Fair Value, Without single maturity date | 11,660 |  |  |
Securities, available-for-sale, Fair Value | $ 11,660 | $ 11,211 |  |

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