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Securities - Amortized Cost and Fair Value of Securities (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | --- | --- | ---
Securities, held-to-maturity, Amortized Cost | $ 74,010 | $ 74,811 |  |
Securities held-to-maturity, Fair Value | 65,755 | 62,550 |  |
Securities held-to-maturity, Gross Unrecognized Losses | (8,255) | (12,261) |  |
Securities held-to-maturity, Allowance for credit losses | (1,087) | (1,100) | $ (862) | $ (907)
Securities held-to-maturity | 72,923 | 73,711 |  |
Securities available-for-sale, Amortized Cost excluding portfolio layer adjustments | 956,418 |  |  |
Securities, available-for-sale, Unallocated portfolio layer basis adjustments | (2,254) |  |  |
Securities available-for-sale | 954,164 | 826,881 |  |
Securities, available-for-sale, Fair Value | 874,753 | 735,357 |  |
Securities available for sale, Gross Unrealized Gains | 1,355 | 5 |  |
Securities available-for-sale, Gross Unrealized Losses excluding portfolio layer adjustments | 83,020 |  |  |
Securities available for sale, Gross Unrealized Losses | (80,766) | (91,529) |  |
US States and Political Subdivisions Debt Securities [Member] |  |  |  |
Securities, held-to-maturity, Amortized Cost | 66,155 | 66,936 |  |
Securities held-to-maturity, Fair Value | 58,697 | 55,561 |  |
Securities held-to-maturity, Gross Unrecognized Losses | (7,458) | (11,375) |  |
Other Debt Obligations |  |  |  |
Securities, held-to-maturity, Amortized Cost | 66,155 | 66,936 |  |
Securities held-to-maturity, Fair Value | 58,697 | 55,561 |  |
Securities held-to-maturity, Gross Unrecognized Losses | (7,458) | (11,375) |  |
US Government Agencies Debt Securities [Member] |  |  |  |
Securities available-for-sale, Amortized Cost excluding portfolio layer adjustments | 82,548 |  |  |
Securities available-for-sale |  | 83,720 |  |
Securities, available-for-sale, Fair Value | 81,734 | 81,103 |  |
Securities available for sale, Gross Unrealized Gains | 123 | 2 |  |
Securities available-for-sale, Gross Unrealized Losses excluding portfolio layer adjustments | 937 |  |  |
Securities available for sale, Gross Unrealized Losses |  | (2,619) |  |
Corporate Debt Securities [Member] |  |  |  |
Securities available-for-sale, Amortized Cost excluding portfolio layer adjustments | 173,184 |  |  |
Securities available-for-sale |  | 146,430 |  |
Securities, available-for-sale, Fair Value | 155,449 | 131,766 |  |
Securities available for sale, Gross Unrealized Gains | 0 | 0 |  |
Securities available-for-sale, Gross Unrealized Losses excluding portfolio layer adjustments | 17,735 |  |  |
Securities available for sale, Gross Unrealized Losses |  | (14,664) |  |
Mutual Fund Debt Securities [Member] |  |  |  |
Securities available-for-sale, Amortized Cost excluding portfolio layer adjustments | 11,660 |  |  |
Securities available-for-sale |  | 11,211 |  |
Securities, available-for-sale, Fair Value | 11,660 | 11,211 |  |
Securities available for sale, Gross Unrealized Gains | 0 | 0 |  |
Securities available-for-sale, Gross Unrealized Losses excluding portfolio layer adjustments | 0 |  |  |
Securities available for sale, Gross Unrealized Losses |  | 0 |  |
Collateralized Debt Obligations [Member] |  |  |  |
Securities available-for-sale, Amortized Cost excluding portfolio layer adjustments | 269,600 |  |  |
Securities available-for-sale |  | 129,684 |  |
Securities, available-for-sale, Fair Value | 270,129 | 125,478 |  |
Securities available for sale, Gross Unrealized Gains | 1,215 | 0 |  |
Securities available-for-sale, Gross Unrealized Losses excluding portfolio layer adjustments | 686 |  |  |
Securities available for sale, Gross Unrealized Losses |  | (4,206) |  |
Other Securities [Member] |  |  |  |
Securities available-for-sale, Amortized Cost excluding portfolio layer adjustments | 1,437 |  |  |
Securities available-for-sale |  | 1,516 |  |
Securities, available-for-sale, Fair Value | 1,437 | 1,516 |  |
Securities available for sale, Gross Unrealized Gains | 0 | 0 |  |
Securities available-for-sale, Gross Unrealized Losses excluding portfolio layer adjustments | 0 |  |  |
Securities available for sale, Gross Unrealized Losses |  | 0 |  |
Available for Sale Securities Excluding Mortgage Backed Securities [Member] |  |  |  |
Securities available-for-sale, Amortized Cost excluding portfolio layer adjustments | 538,429 |  |  |
Securities available-for-sale |  | 372,561 |  |
Securities, available-for-sale, Fair Value | 520,409 | 351,074 |  |
Securities available for sale, Gross Unrealized Gains | 1,338 | 2 |  |
Securities available-for-sale, Gross Unrealized Losses excluding portfolio layer adjustments | 19,358 |  |  |
Securities available for sale, Gross Unrealized Losses |  | (21,489) |  |
REMIC and CMO [Member] |  |  |  |
Securities available-for-sale, Amortized Cost excluding portfolio layer adjustments | 160,165 |  |  |
Securities available-for-sale |  | 175,712 |  |
Securities, available-for-sale, Fair Value | 133,574 | 148,414 |  |
Securities available for sale, Gross Unrealized Gains | 0 | 0 |  |
Securities available-for-sale, Gross Unrealized Losses excluding portfolio layer adjustments | 26,591 |  |  |
Securities available for sale, Gross Unrealized Losses |  | (27,298) |  |
GNMA [Member] |  |  |  |
Securities available-for-sale, Amortized Cost excluding portfolio layer adjustments | 12,402 |  |  |
Securities available-for-sale |  | 9,193 |  |
Securities, available-for-sale, Fair Value | 10,665 | 7,317 |  |
Securities available for sale, Gross Unrealized Gains | 3 | 3 |  |
Securities available-for-sale, Gross Unrealized Losses excluding portfolio layer adjustments | 1,740 |  |  |
Securities available for sale, Gross Unrealized Losses |  | (1,879) |  |
FNMA [Member] |  |  |  |
Securities, held-to-maturity, Amortized Cost | 7,855 | 7,875 |  |
Securities held-to-maturity, Fair Value | 7,058 | 6,989 |  |
Securities held-to-maturity, Gross Unrecognized Losses | (797) | (886) |  |
Securities available-for-sale, Amortized Cost excluding portfolio layer adjustments | 155,995 |  |  |
Securities available-for-sale |  | 172,690 |  |
Securities, available-for-sale, Fair Value | 135,074 | 148,265 |  |
Securities available for sale, Gross Unrealized Gains | 14 | 0 |  |
Securities available-for-sale, Gross Unrealized Losses excluding portfolio layer adjustments | 20,935 |  |  |
Securities available for sale, Gross Unrealized Losses |  | (24,425) |  |
FHLMC [Member] |  |  |  |
Securities available-for-sale, Amortized Cost excluding portfolio layer adjustments | 89,427 |  |  |
Securities available-for-sale |  | 96,725 |  |
Securities, available-for-sale, Fair Value | 75,031 | 80,287 |  |
Securities available for sale, Gross Unrealized Gains | 0 | 0 |  |
Securities available-for-sale, Gross Unrealized Losses excluding portfolio layer adjustments | 14,396 |  |  |
Securities available for sale, Gross Unrealized Losses |  | (16,438) |  |
Collateralized Mortgage Backed Securities |  |  |  |
Securities, held-to-maturity, Amortized Cost | 7,855 | 7,875 |  |
Securities held-to-maturity, Fair Value | 7,058 | 6,989 |  |
Securities held-to-maturity, Gross Unrecognized Losses | (797) | (886) |  |
Securities available-for-sale, Amortized Cost excluding portfolio layer adjustments | 417,989 |  |  |
Securities available-for-sale |  | 454,320 |  |
Securities, available-for-sale, Fair Value | 354,344 | 384,283 |  |
Securities available for sale, Gross Unrealized Gains | 17 | 3 |  |
Securities available-for-sale, Gross Unrealized Losses excluding portfolio layer adjustments | $ 63,662 |  |  |
Securities available for sale, Gross Unrealized Losses |  | $ (70,040) |  |

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