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Securities - Amortized Cost and Fair Value of Securities (Details) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | --- | --- | ---
Securities, held-to-maturity, Amortized Cost | $ 51,838 | $ 74,010 |  |
Securities held-to-maturity, Allowance for Credit Losses | (353) | (1,087) | $ (1,100) | $ (862)
Securities held-to-maturity, Net Carrying Amount | 51,485 | 72,923 |  |
Securities held-to-maturity, Gross Unrecognized Losses | (6,767) | (7,168) |  |
Securities held-to-maturity, Fair Value | 44,718 | 65,755 |  |
Total Securities available for sale, before allowance for credit losses | 1,506,798 |  |  |
Securities available-for-sale |  | 956,418 |  |
Securities, available-for-sale, Unallocated portfolio layer basis adjustments |  | (2,254) |  |
Total securities available for sale, net of allowance for credit losses |  | 954,164 |  |
Total Securities available for sale, Allowance for Credit Losses | (2,627) | 0 |  |
Total Securities available for sale, Gross Unrealized Gains | 3,069 | 1,355 |  |
Securities available-for-sale, Gross Unrealized Losses excluding portfolio layer adjustments |  | (83,020) |  |
Securities available-for-sale, Gross Unrealized Losses, Unallocated portfolio layer basis adjustments |  | 2,254 |  |
Total Securities available for sale, Gross Unrealized Losses | (9,335) | (80,766) |  |
Total Securities available for sale, Fair Value | 1,497,905 | 874,753 |  |
Total Other Securities [Member] |  |  |  |
Total Securities available for sale, before allowance for credit losses | 593,928 |  |  |
Securities available-for-sale |  | 538,429 |  |
Total Securities available for sale, Allowance for Credit Losses | (2,627) |  |  |
Total Securities available for sale, Gross Unrealized Gains | 1,938 | 1,338 |  |
Securities available-for-sale, Gross Unrealized Losses excluding portfolio layer adjustments |  | (19,358) |  |
Total Securities available for sale, Gross Unrealized Losses | (6,970) |  |  |
Total Securities available for sale, Fair Value | 586,269 | 520,409 |  |
US States and Political Subdivisions Debt Securities [Member] |  |  |  |
Securities, held-to-maturity, Amortized Cost | 44,002 | 66,155 |  |
Securities held-to-maturity, Allowance for Credit Losses | (353) | (1,087) |  |
Securities held-to-maturity, Net Carrying Amount | 43,649 | 65,068 |  |
Securities held-to-maturity, Gross Unrecognized Losses | (5,834) | (6,371) |  |
Securities held-to-maturity, Fair Value | 37,815 | 58,697 |  |
Total Securities available for sale, before allowance for credit losses | 20,627 |  |  |
Total Securities available for sale, Allowance for Credit Losses | (2,627) |  |  |
Total Securities available for sale, Gross Unrealized Gains | 0 |  |  |
Total Securities available for sale, Fair Value | 18,000 |  |  |
US Government Agencies Debt Securities [Member] |  |  |  |
Total Securities available for sale, before allowance for credit losses | 8,804 |  |  |
Securities available-for-sale |  | 82,548 |  |
Total Securities available for sale, Gross Unrealized Gains | 77 | 123 |  |
Securities available-for-sale, Gross Unrealized Losses excluding portfolio layer adjustments |  | (937) |  |
Total Securities available for sale, Gross Unrealized Losses | (33) |  |  |
Total Securities available for sale, Fair Value | 8,848 | 81,734 |  |
Corporate Debt Securities [Member] |  |  |  |
Total Securities available for sale, before allowance for credit losses | 130,882 |  |  |
Securities available-for-sale |  | 173,184 |  |
Total Securities available for sale, Gross Unrealized Gains | 735 |  |  |
Securities available-for-sale, Gross Unrealized Losses excluding portfolio layer adjustments |  | (17,735) |  |
Total Securities available for sale, Gross Unrealized Losses | (6,368) |  |  |
Total Securities available for sale, Fair Value | 125,249 | 155,449 |  |
Mutual Fund Debt Securities [Member] |  |  |  |
Total Securities available for sale, before allowance for credit losses | 11,890 |  |  |
Securities available-for-sale |  | 11,660 |  |
Total Securities available for sale, Gross Unrealized Gains | 0 |  |  |
Total Securities available for sale, Fair Value | 11,890 | 11,660 |  |
Collateralized Debt Obligations [Member] |  |  |  |
Total Securities available for sale, before allowance for credit losses | 420,260 |  |  |
Securities available-for-sale |  | 269,600 |  |
Total Securities available for sale, Gross Unrealized Gains | 1,126 | 1,215 |  |
Securities available-for-sale, Gross Unrealized Losses excluding portfolio layer adjustments |  | (686) |  |
Total Securities available for sale, Gross Unrealized Losses | (569) |  |  |
Total Securities available for sale, Fair Value | 420,817 | 270,129 |  |
Other Debt Obligations |  |  |  |
Total Securities available for sale, before allowance for credit losses | 1,465 |  |  |
Securities available-for-sale |  | 1,437 |  |
Total Securities available for sale, Gross Unrealized Gains | 0 |  |  |
Total Securities available for sale, Fair Value | 1,465 | 1,437 |  |
Collateralized Mortgage Backed Securities |  |  |  |
Total Securities available for sale, before allowance for credit losses | 912,870 |  |  |
Securities available-for-sale |  | 417,989 |  |
Total Securities available for sale, Gross Unrealized Gains | 1,131 | 17 |  |
Securities available-for-sale, Gross Unrealized Losses excluding portfolio layer adjustments |  | (63,662) |  |
Total Securities available for sale, Gross Unrealized Losses | (2,365) |  |  |
Total Securities available for sale, Fair Value | 911,636 | 354,344 |  |
REMIC and CMO [Member] |  |  |  |
Total Securities available for sale, before allowance for credit losses | 707,540 |  |  |
Securities available-for-sale |  | 160,165 |  |
Total Securities available for sale, Gross Unrealized Gains | 1,107 |  |  |
Securities available-for-sale, Gross Unrealized Losses excluding portfolio layer adjustments |  | (26,591) |  |
Total Securities available for sale, Gross Unrealized Losses | (1,067) |  |  |
Total Securities available for sale, Fair Value | 707,580 | 133,574 |  |
GNMA [Member] |  |  |  |
Total Securities available for sale, before allowance for credit losses | 30,099 |  |  |
Securities available-for-sale |  | 12,402 |  |
Total Securities available for sale, Gross Unrealized Gains | 0 | 3 |  |
Securities available-for-sale, Gross Unrealized Losses excluding portfolio layer adjustments |  | (1,740) |  |
Total Securities available for sale, Gross Unrealized Losses | (154) |  |  |
Total Securities available for sale, Fair Value | 29,945 | 10,665 |  |
FNMA [Member] |  |  |  |
Securities, held-to-maturity, Amortized Cost | 7,836 | 7,855 |  |
Securities held-to-maturity, Net Carrying Amount | 7,836 | 7,855 |  |
Securities held-to-maturity, Gross Unrecognized Losses | (933) | (797) |  |
Securities held-to-maturity, Fair Value | 6,903 | 7,058 |  |
Total Securities available for sale, before allowance for credit losses | 99,183 |  |  |
Securities available-for-sale |  | 155,995 |  |
Total Securities available for sale, Gross Unrealized Gains | 11 | 14 |  |
Securities available-for-sale, Gross Unrealized Losses excluding portfolio layer adjustments |  | (20,935) |  |
Total Securities available for sale, Gross Unrealized Losses | (1,048) |  |  |
Total Securities available for sale, Fair Value | 98,146 | 135,074 |  |
FHLMC [Member] |  |  |  |
Total Securities available for sale, before allowance for credit losses | 76,048 |  |  |
Securities available-for-sale |  | 89,427 |  |
Total Securities available for sale, Gross Unrealized Gains | 13 |  |  |
Securities available-for-sale, Gross Unrealized Losses excluding portfolio layer adjustments |  | (14,396) |  |
Total Securities available for sale, Gross Unrealized Losses | (96) |  |  |
Total Securities available for sale, Fair Value | $ 75,965 | $ 75,031 |  |

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