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Securities - Available-for-Sale and Held-to-Maturity by Contractual Maturity (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Mar. 31, 2024 | Dec. 31, 2023 | Sep. 30, 2023 | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | --- | --- | --- | --- | ---
Securities held-to-maturity, Amortized Cost, Due after ten years | $ 64,945 |  |  |  |  |
Securities, held-to-maturity, Amortized Cost, With single maturity date | 64,945 |  |  |  |  |
Securities, held-to-maturity, Amortized Cost | 72,786 |  | $ 74,010 |  |  |
Securities held-to-maturity, Allowance for credit losses | (1,086) | $ (1,089) | (1,087) | $ (1,082) | $ (1,079) | $ (1,100)
Securities held-to-maturity | 71,700 |  | 72,923 |  |  |
Securities held-to-maturity, Fair Value, Due after ten years | 56,709 |  |  |  |  |
Securities held-to-maturity, Fair Value, With single maturity date | 56,709 |  |  |  |  |
Debt Securities, Held-to-maturity, Fair Value, Total | 63,952 |  | 65,755 |  |  |
Securities available-for-sale, Amortized Cost, Due in one year or less | 29,953 |  |  |  |  |
Securities available-for-sale, Amortized Cost, Due after one years through five years | 75,191 |  |  |  |  |
Securities available-for-sale, Amortized Cost, Due after five years through ten years | 207,758 |  |  |  |  |
Securities available-for-sale, Amortized Cost, Due after ten years | 375,596 |  |  |  |  |
Securities available-for-sale, Amortized Cost, With single maturity date | 688,498 |  |  |  |  |
Securities available-for-sale | 1,677,943 |  | 956,418 |  |  |
Securities available for sale, Fair Value, Due in one year or less | 29,635 |  |  |  |  |
Securities available for sale, Fair Value, Due after one years through five years | 71,066 |  |  |  |  |
Securities available for sale, Fair Value, Due after five years through ten years | 198,713 |  |  |  |  |
Securities available for sale, Fair Value, Due after ten years | 375,936 |  |  |  |  |
Securities available-for-sale, Fair Value, With single maturity date | 675,350 |  |  |  |  |
Securities, available-for-sale, Fair Value | 1,614,249 |  | 874,753 |  |  |
Basis adjustments | (2,184) |  | 949 |  |  |
Designated as Hedging Instrument [Member] | Portfolio Layer Hedges on Closed Portfolio of Securities Available for Sale [Member] |  |  |  |  |  |
Basis adjustments | 100 |  | 2,300 |  |  |
Total Other Securities [Member] |  |  |  |  |  |
Securities, held-to-maturity, Amortized Cost | 64,945 |  | 66,155 |  |  |
Debt Securities, Held-to-maturity, Fair Value, Total | 56,709 |  | 58,697 |  |  |
Securities available-for-sale | 700,666 |  | 538,429 |  |  |
Securities, available-for-sale, Fair Value | 687,518 |  | 520,409 |  |  |
Collateralized Mortgage Backed Securities |  |  |  |  |  |
Securities held-to-maturity, Amortized Cost, Without single maturity | 7,841 |  |  |  |  |
Securities, held-to-maturity, Amortized Cost | 7,841 |  | 7,855 |  |  |
Securities held-to-maturity, Fair Value, Without single maturity date | 7,243 |  |  |  |  |
Debt Securities, Held-to-maturity, Fair Value, Total | 7,243 |  | 7,058 |  |  |
Securities, available-for-sale, Amortized Cost, Without single maturity date | 977,277 |  |  |  |  |
Securities available-for-sale | 977,277 |  | 417,989 |  |  |
Securities available-for-sale, Fair Value, Without single maturity date | 926,731 |  |  |  |  |
Securities, available-for-sale, Fair Value | 926,731 |  | 354,344 |  |  |
Mutual Fund Debt Securities [Member] |  |  |  |  |  |
Securities, available-for-sale, Amortized Cost, Without single maturity date | 12,168 |  |  |  |  |
Securities available-for-sale | 12,168 |  | 11,660 |  |  |
Securities available-for-sale, Fair Value, Without single maturity date | 12,168 |  |  |  |  |
Securities, available-for-sale, Fair Value | $ 12,168 |  | $ 11,660 |  |  |

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