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Securities - Amortized Cost and Fair Value of Securities (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 | $ 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 | 61,070 |  | 65,755 |  |  |
Securities held-to-maturity, Gross Unrecognized Losses | (12,031) |  | (8,255) |  |  |
Securities available-for-sale, Amortized Cost excluding portfolio layer adjustments | 1,636,359 |  | 956,418 |  |  |
Securities, available-for-sale, Unallocated portfolio layer basis adjustments | (5,195) |  | (2,254) |  |  |
Securities available-for-sale | 1,631,164 |  | 954,164 |  |  |
Securities, available-for-sale, Fair Value | 1,548,611 |  | 874,753 |  |  |
Securities available for sale, Gross Unrealized Gains | 2,314 |  | 1,355 |  |  |
Securities available-for-sale, Gross Unrealized Losses excluding portfolio layer adjustments | (90,062) |  | (83,020) |  |  |
Securities available-for-sale, Gross Unrealized Losses, Unallocated portfolio layer basis adjustments | 5,195 |  | 2,254 |  |  |
Securities available for sale, Gross Unrealized Losses | 84,867 |  | 80,766 |  |  |
Total Other Securities [Member] |  |  |  |  |  |
Securities, held-to-maturity, Amortized Cost | 65,255 |  | 66,155 |  |  |
Securities held-to-maturity, Fair Value | 54,153 |  | 58,697 |  |  |
Securities held-to-maturity, Gross Unrecognized Losses | (11,102) |  | (7,458) |  |  |
Securities available-for-sale, Amortized Cost excluding portfolio layer adjustments | 696,553 |  | 538,429 |  |  |
Securities, available-for-sale, Fair Value | 679,117 |  | 520,409 |  |  |
Securities available for sale, Gross Unrealized Gains | 2,029 |  | 1,338 |  |  |
Securities available-for-sale, Gross Unrealized Losses excluding portfolio layer adjustments | (19,465) |  | (19,358) |  |  |
US States and Political Subdivisions Debt Securities [Member] |  |  |  |  |  |
Securities, held-to-maturity, Amortized Cost | 65,255 |  | 66,155 |  |  |
Securities held-to-maturity, Fair Value | 54,153 |  | 58,697 |  |  |
Securities held-to-maturity, Gross Unrecognized Losses | (11,102) |  | (7,458) |  |  |
US Government Agencies Debt Securities [Member] |  |  |  |  |  |
Securities available-for-sale, Amortized Cost excluding portfolio layer adjustments | 31,073 |  | 82,548 |  |  |
Securities, available-for-sale, Fair Value | 30,678 |  | 81,734 |  |  |
Securities available for sale, Gross Unrealized Gains | 122 |  | 123 |  |  |
Securities available-for-sale, Gross Unrealized Losses excluding portfolio layer adjustments | (517) |  | (937) |  |  |
Corporate Debt Securities [Member] |  |  |  |  |  |
Securities available-for-sale, Amortized Cost excluding portfolio layer adjustments | 177,234 |  | 173,184 |  |  |
Securities, available-for-sale, Fair Value | 158,759 |  | 155,449 |  |  |
Securities available for sale, Gross Unrealized Gains | 24 |  |  |  |  |
Securities available-for-sale, Gross Unrealized Losses excluding portfolio layer adjustments | (18,499) |  | (17,735) |  |  |
Mutual Fund Debt Securities [Member] |  |  |  |  |  |
Securities available-for-sale, Amortized Cost excluding portfolio layer adjustments | 11,655 |  | 11,660 |  |  |
Securities, available-for-sale, Fair Value | 11,655 |  | 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 | 475,134 |  | 269,600 |  |  |
Securities, available-for-sale, Fair Value | 476,568 |  | 270,129 |  |  |
Securities available for sale, Gross Unrealized Gains | 1,883 |  | 1,215 |  |  |
Securities available-for-sale, Gross Unrealized Losses excluding portfolio layer adjustments | (449) |  | (686) |  |  |
Other Debt Obligations |  |  |  |  |  |
Securities available-for-sale, Amortized Cost excluding portfolio layer adjustments | 1,457 |  | 1,437 |  |  |
Securities, available-for-sale, Fair Value | 1,457 |  | 1,437 |  |  |
Securities available-for-sale, Gross Unrealized Losses excluding portfolio layer adjustments |  |  | 0 |  |  |
Collateralized Mortgage Backed Securities |  |  |  |  |  |
Securities, held-to-maturity, Amortized Cost | 7,846 |  | 7,855 |  |  |
Securities held-to-maturity, Fair Value | 6,917 |  | 7,058 |  |  |
Securities held-to-maturity, Gross Unrecognized Losses | (929) |  | (797) |  |  |
Securities available-for-sale, Amortized Cost excluding portfolio layer adjustments | 939,806 |  | 417,989 |  |  |
Securities, available-for-sale, Fair Value | 869,494 |  | 354,344 |  |  |
Securities available for sale, Gross Unrealized Gains | 285 |  | 17 |  |  |
Securities available-for-sale, Gross Unrealized Losses excluding portfolio layer adjustments | (70,597) |  | (63,662) |  |  |
REMIC and CMO [Member] |  |  |  |  |  |
Securities available-for-sale, Amortized Cost excluding portfolio layer adjustments | 678,425 |  | 160,165 |  |  |
Securities, available-for-sale, Fair Value | 649,262 |  | 133,574 |  |  |
Securities available for sale, Gross Unrealized Gains | 280 |  |  |  |  |
Securities available-for-sale, Gross Unrealized Losses excluding portfolio layer adjustments | (29,443) |  | (26,591) |  |  |
GNMA [Member] |  |  |  |  |  |
Securities available-for-sale, Amortized Cost excluding portfolio layer adjustments | 26,250 |  | 12,402 |  |  |
Securities, available-for-sale, Fair Value | 24,248 |  | 10,665 |  |  |
Securities available for sale, Gross Unrealized Gains | 1 |  | 3 |  |  |
Securities available-for-sale, Gross Unrealized Losses excluding portfolio layer adjustments | (2,003) |  | (1,740) |  |  |
FNMA [Member] |  |  |  |  |  |
Securities, held-to-maturity, Amortized Cost | 7,846 |  | 7,855 |  |  |
Securities held-to-maturity, Fair Value | 6,917 |  | 7,058 |  |  |
Securities held-to-maturity, Gross Unrecognized Losses | (929) |  | (797) |  |  |
Securities available-for-sale, Amortized Cost excluding portfolio layer adjustments | 148,928 |  | 155,995 |  |  |
Securities, available-for-sale, Fair Value | 125,740 |  | 135,074 |  |  |
Securities available for sale, Gross Unrealized Gains | 4 |  | 14 |  |  |
Securities available-for-sale, Gross Unrealized Losses excluding portfolio layer adjustments | (23,192) |  | (20,935) |  |  |
FHLMC [Member] |  |  |  |  |  |
Securities available-for-sale, Amortized Cost excluding portfolio layer adjustments | 86,203 |  | 89,427 |  |  |
Securities, available-for-sale, Fair Value | 70,244 |  | 75,031 |  |  |
Securities available-for-sale, Gross Unrealized Losses excluding portfolio layer adjustments | $ (15,959) |  | $ (14,396) |  |  |

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