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Securities - Amortized Cost and Fair Value of Securities (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 | $ 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 | 63,952 |  | 65,755 |  |  |
Securities held-to-maturity, Gross Unrecognized Losses | (8,834) |  | (8,255) |  |  |
Securities available-for-sale, Amortized Cost excluding portfolio layer adjustments | 1,677,943 |  | 956,418 |  |  |
Securities, available-for-sale, Unallocated portfolio layer basis adjustments | (89) |  | (2,254) |  |  |
Securities available-for-sale | 1,677,854 |  | 954,164 |  |  |
Securities, available-for-sale, Fair Value | 1,614,249 |  | 874,753 |  |  |
Securities available for sale, Gross Unrealized Gains | 6,357 |  | 1,355 |  |  |
Securities available-for-sale, Gross Unrealized Losses excluding portfolio layer adjustments | (70,051) |  | (83,020) |  |  |
Securities available-for-sale, Gross Unrealized Losses, Unallocated portfolio layer basis adjustments | 89 |  | 2,254 |  |  |
Securities available for sale, Gross Unrealized Losses | 69,962 |  | 80,766 |  |  |
Total Other Securities [Member] |  |  |  |  |  |
Securities, held-to-maturity, Amortized Cost | 64,945 |  | 66,155 |  |  |
Securities held-to-maturity, Fair Value | 56,709 |  | 58,697 |  |  |
Securities held-to-maturity, Gross Unrecognized Losses | (8,236) |  | (7,458) |  |  |
Securities available-for-sale, Amortized Cost excluding portfolio layer adjustments | 700,666 |  | 538,429 |  |  |
Securities, available-for-sale, Fair Value | 687,518 |  | 520,409 |  |  |
Securities available for sale, Gross Unrealized Gains | 2,176 |  | 1,338 |  |  |
Securities available-for-sale, Gross Unrealized Losses excluding portfolio layer adjustments | (15,324) |  | (19,358) |  |  |
US States and Political Subdivisions Debt Securities [Member] |  |  |  |  |  |
Securities, held-to-maturity, Amortized Cost | 64,945 |  | 66,155 |  |  |
Securities held-to-maturity, Fair Value | 56,709 |  | 58,697 |  |  |
Securities held-to-maturity, Gross Unrecognized Losses | (8,236) |  | (7,458) |  |  |
US Government Agencies Debt Securities [Member] |  |  |  |  |  |
Securities available-for-sale, Amortized Cost excluding portfolio layer adjustments | 30,016 |  | 82,548 |  |  |
Securities, available-for-sale, Fair Value | 29,856 |  | 81,734 |  |  |
Securities available for sale, Gross Unrealized Gains | 106 |  | 123 |  |  |
Securities available-for-sale, Gross Unrealized Losses excluding portfolio layer adjustments | (266) |  | (937) |  |  |
Corporate Debt Securities [Member] |  |  |  |  |  |
Securities available-for-sale, Amortized Cost excluding portfolio layer adjustments | 183,281 |  | 173,184 |  |  |
Securities, available-for-sale, Fair Value | 169,555 |  | 155,449 |  |  |
Securities available for sale, Gross Unrealized Gains | 407 |  |  |  |  |
Securities available-for-sale, Gross Unrealized Losses excluding portfolio layer adjustments | (14,133) |  | (17,735) |  |  |
Mutual Fund Debt Securities [Member] |  |  |  |  |  |
Securities available-for-sale, Amortized Cost excluding portfolio layer adjustments | 12,168 |  | 11,660 |  |  |
Securities, available-for-sale, Fair Value | 12,168 |  | 11,660 |  |  |
Securities available-for-sale, Gross Unrealized Losses excluding portfolio layer adjustments |  |  | 0 |  |  |
Collateralized Debt Obligations [Member] |  |  |  |  |  |
Securities available-for-sale, Amortized Cost excluding portfolio layer adjustments | 473,762 |  | 269,600 |  |  |
Securities, available-for-sale, Fair Value | 474,500 |  | 270,129 |  |  |
Securities available for sale, Gross Unrealized Gains | 1,663 |  | 1,215 |  |  |
Securities available-for-sale, Gross Unrealized Losses excluding portfolio layer adjustments | (925) |  | (686) |  |  |
Other Debt Obligations |  |  |  |  |  |
Securities available-for-sale, Amortized Cost excluding portfolio layer adjustments | 1,439 |  | 1,437 |  |  |
Securities, available-for-sale, Fair Value | 1,439 |  | 1,437 |  |  |
Securities available-for-sale, Gross Unrealized Losses excluding portfolio layer adjustments |  |  | 0 |  |  |
Collateralized Mortgage Backed Securities |  |  |  |  |  |
Securities, held-to-maturity, Amortized Cost | 7,841 |  | 7,855 |  |  |
Securities held-to-maturity, Fair Value | 7,243 |  | 7,058 |  |  |
Securities held-to-maturity, Gross Unrecognized Losses | (598) |  | (797) |  |  |
Securities available-for-sale, Amortized Cost excluding portfolio layer adjustments | 977,277 |  | 417,989 |  |  |
Securities, available-for-sale, Fair Value | 926,731 |  | 354,344 |  |  |
Securities available for sale, Gross Unrealized Gains | 4,181 |  | 17 |  |  |
Securities available-for-sale, Gross Unrealized Losses excluding portfolio layer adjustments | (54,727) |  | (63,662) |  |  |
REMIC and CMO [Member] |  |  |  |  |  |
Securities available-for-sale, Amortized Cost excluding portfolio layer adjustments | 723,583 |  | 160,165 |  |  |
Securities, available-for-sale, Fair Value | 704,494 |  | 133,574 |  |  |
Securities available for sale, Gross Unrealized Gains | 4,055 |  |  |  |  |
Securities available-for-sale, Gross Unrealized Losses excluding portfolio layer adjustments | (23,144) |  | (26,591) |  |  |
GNMA [Member] |  |  |  |  |  |
Securities available-for-sale, Amortized Cost excluding portfolio layer adjustments | 23,686 |  | 12,402 |  |  |
Securities, available-for-sale, Fair Value | 22,254 |  | 10,665 |  |  |
Securities available for sale, Gross Unrealized Gains | 85 |  | 3 |  |  |
Securities available-for-sale, Gross Unrealized Losses excluding portfolio layer adjustments | (1,517) |  | (1,740) |  |  |
FNMA [Member] |  |  |  |  |  |
Securities, held-to-maturity, Amortized Cost | 7,841 |  | 7,855 |  |  |
Securities held-to-maturity, Fair Value | 7,243 |  | 7,058 |  |  |
Securities held-to-maturity, Gross Unrecognized Losses | (598) |  | (797) |  |  |
Securities available-for-sale, Amortized Cost excluding portfolio layer adjustments | 145,547 |  | 155,995 |  |  |
Securities, available-for-sale, Fair Value | 128,047 |  | 135,074 |  |  |
Securities available for sale, Gross Unrealized Gains | 41 |  | 14 |  |  |
Securities available-for-sale, Gross Unrealized Losses excluding portfolio layer adjustments | (17,541) |  | (20,935) |  |  |
FHLMC [Member] |  |  |  |  |  |
Securities available-for-sale, Amortized Cost excluding portfolio layer adjustments | 84,461 |  | 89,427 |  |  |
Securities, available-for-sale, Fair Value | 71,936 |  | 75,031 |  |  |
Securities available-for-sale, Gross Unrealized Losses excluding portfolio layer adjustments | $ (12,525) |  | $ (14,396) |  |  |

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