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Securities - Available-for-Sale and Held-to-Maturity by Contractual Maturity (Details) - USD ($) $ in Thousands | Jun. 30, 2024 | Mar. 31, 2024 | Dec. 31, 2023 | Jun. 30, 2023 | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | --- | --- | --- | --- | ---
Securities held-to-maturity, Amortized Cost, Due after ten years | $ 65,255 |  |  |  |  |
Securities, held-to-maturity, Amortized Cost, With single maturity date | 65,255 |  |  |  |  |
Securities, held-to-maturity, Amortized Cost | 73,101 |  | $ 74,010 |  |  |
Securities held-to-maturity, Allowance for credit losses | (1,089) | $ (1,084) | (1,087) | $ (1,079) | $ (1,087) | $ (1,100)
Securities held-to-maturity | 72,012 |  | 72,923 |  |  |
Securities held-to-maturity, Fair Value, Due after ten years | 54,153 |  |  |  |  |
Securities held-to-maturity, Fair Value, With single maturity date | 54,153 |  |  |  |  |
Debt Securities, Held-to-maturity, Fair Value, Total | 61,070 |  | 65,755 |  |  |
Securities available-for-sale, Amortized Cost, Due in one year or less | 29,927 |  |  |  |  |
Securities available-for-sale, Amortized Cost, Due after one years through five years | 75,188 |  |  |  |  |
Securities available-for-sale, Amortized Cost, Due after five years through ten years | 192,898 |  |  |  |  |
Securities available-for-sale, Amortized Cost, Due after ten years | 386,885 |  |  |  |  |
Securities available-for-sale, Amortized Cost, With single maturity date | 684,898 |  |  |  |  |
Securities available-for-sale | 1,636,359 |  | 956,418 |  |  |
Securities available for sale, Fair Value, Due in one year or less | 29,291 |  |  |  |  |
Securities available for sale, Fair Value, Due after one years through five years | 70,119 |  |  |  |  |
Securities available for sale, Fair Value, Due after five years through ten years | 180,115 |  |  |  |  |
Securities available for sale, Fair Value, Due after ten years | 387,937 |  |  |  |  |
Securities available-for-sale, Fair Value, With single maturity date | 667,462 |  |  |  |  |
Securities, available-for-sale, Fair Value | 1,548,611 |  | 874,753 |  |  |
Basis adjustments | 6,656 |  | 949 |  |  |
Designated as Hedging Instrument [Member] | Portfolio Layer Hedges on Closed Portfolio of Securities Available for Sale [Member] |  |  |  |  |  |
Basis adjustments | 5,200 |  | 2,300 |  |  |
Total Other Securities [Member] |  |  |  |  |  |
Securities, held-to-maturity, Amortized Cost | 65,255 |  | 66,155 |  |  |
Debt Securities, Held-to-maturity, Fair Value, Total | 54,153 |  | 58,697 |  |  |
Securities available-for-sale | 696,553 |  | 538,429 |  |  |
Securities, available-for-sale, Fair Value | 679,117 |  | 520,409 |  |  |
Collateralized Mortgage Backed Securities |  |  |  |  |  |
Securities held-to-maturity, Amortized Cost, Without single maturity | 7,846 |  |  |  |  |
Securities, held-to-maturity, Amortized Cost | 7,846 |  | 7,855 |  |  |
Securities held-to-maturity, Fair Value, Without single maturity date | 6,917 |  |  |  |  |
Debt Securities, Held-to-maturity, Fair Value, Total | 6,917 |  | 7,058 |  |  |
Securities, available-for-sale, Amortized Cost, Without single maturity date | 939,806 |  |  |  |  |
Securities available-for-sale | 939,806 |  | 417,989 |  |  |
Securities available-for-sale, Fair Value, Without single maturity date | 869,494 |  |  |  |  |
Securities, available-for-sale, Fair Value | 869,494 |  | 354,344 |  |  |
Mutual Fund Debt Securities [Member] |  |  |  |  |  |
Securities, available-for-sale, Amortized Cost, Without single maturity date | 11,655 |  |  |  |  |
Securities available-for-sale | 11,655 |  | 11,660 |  |  |
Securities available-for-sale, Fair Value, Without single maturity date | 11,655 |  |  |  |  |
Securities, available-for-sale, Fair Value | $ 11,655 |  | $ 11,660 |  |  |

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