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Securities - Amortized Cost and Fair Value of Securities (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Mar. 31, 2023 | Dec. 31, 2022 | Sep. 30, 2022 | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | --- | --- | --- | --- | ---
Securities, held-to-maturity, Amortized Cost | $ 74,213 |  |  |  |  |
Securities held-to-maturity, Fair Value | 57,665 |  | $ 62,550 |  |  |
Securities held-to-maturity, Gross Unrecognized Losses | 16,548 |  | 12,261 |  |  |
Securities held-to-maturity, Allowance for credit losses | (1,082) | $ (1,079) | (1,100) | $ (1,096) | $ (1,085) | $ (862)
Securities held-to-maturity | 73,131 |  | 73,711 |  |  |
Securities available-for-sale, Amortized Cost excluding portfolio layer adjustments | 951,240 |  |  |  |  |
Securities, available-for-sale, Unallocated portfolio layer basis adjustments | (7,721) |  |  |  |  |
Securities available-for-sale | 943,519 |  | 826,881 |  |  |
Securities, available-for-sale, Fair Value | 843,663 |  | 735,357 |  |  |
Securities available for sale, Gross Unrealized Gains | 550 |  | 5 |  |  |
Securities available-for-sale, Gross Unrealized Losses excluding portfolio layer adjustments | 108,127 |  |  |  |  |
Securities available for sale, Gross Unrealized Losses | 100,406 |  | 91,529 |  |  |
Other Securities [Member] |  |  |  |  |  |
Securities available-for-sale, Amortized Cost excluding portfolio layer adjustments | 1,451 |  |  |  |  |
Securities available-for-sale |  |  | 1,516 |  |  |
Securities, available-for-sale, Fair Value | 1,451 |  | 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 |  |  |
US Government Agencies Debt Securities [Member] |  |  |  |  |  |
Securities available-for-sale, Amortized Cost excluding portfolio layer adjustments | 83,037 |  |  |  |  |
Securities available-for-sale |  |  | 83,720 |  |  |
Securities, available-for-sale, Fair Value | 81,481 |  | 81,103 |  |  |
Securities available for sale, Gross Unrealized Gains | 138 |  | 2 |  |  |
Securities available-for-sale, Gross Unrealized Losses excluding portfolio layer adjustments | 1,694 |  |  |  |  |
Securities available for sale, Gross Unrealized Losses |  |  | 2,619 |  |  |
Corporate Debt Securities [Member] |  |  |  |  |  |
Securities available-for-sale, Amortized Cost excluding portfolio layer adjustments | 173,139 |  |  |  |  |
Securities available-for-sale |  |  | 146,430 |  |  |
Securities, available-for-sale, Fair Value | 152,345 |  | 131,766 |  |  |
Securities available for sale, Gross Unrealized Gains | 0 |  | 0 |  |  |
Securities available-for-sale, Gross Unrealized Losses excluding portfolio layer adjustments | 20,794 |  |  |  |  |
Securities available for sale, Gross Unrealized Losses |  |  | 14,664 |  |  |
US States and Political Subdivisions Debt Securities [Member] |  |  |  |  |  |
Securities, held-to-maturity, Amortized Cost | 66,353 |  | 66,936 |  |  |
Securities held-to-maturity, Fair Value | 51,031 |  | 55,561 |  |  |
Securities held-to-maturity, Gross Unrecognized Losses | 15,322 |  | 11,375 |  |  |
Mutual Fund Debt Securities [Member] |  |  |  |  |  |
Securities available-for-sale, Amortized Cost excluding portfolio layer adjustments | 11,066 |  |  |  |  |
Securities available-for-sale |  |  | 11,211 |  |  |
Securities, available-for-sale, Fair Value | 11,066 |  | 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 | 260,727 |  |  |  |  |
Securities available-for-sale |  |  | 129,684 |  |  |
Securities, available-for-sale, Fair Value | 259,441 |  | 125,478 |  |  |
Securities available for sale, Gross Unrealized Gains | 411 |  | 0 |  |  |
Securities available-for-sale, Gross Unrealized Losses excluding portfolio layer adjustments | 1,697 |  |  |  |  |
Securities available for sale, Gross Unrealized Losses |  |  | 4,206 |  |  |
Other Debt Obligations |  |  |  |  |  |
Securities, held-to-maturity, Amortized Cost | 66,353 |  | 66,936 |  |  |
Securities held-to-maturity, Fair Value | 51,031 |  | 55,561 |  |  |
Securities held-to-maturity, Gross Unrecognized Losses | 15,322 |  | 11,375 |  |  |
Collateralized Mortgage Backed Securities |  |  |  |  |  |
Securities, held-to-maturity, Amortized Cost | 7,860 |  | 7,875 |  |  |
Securities held-to-maturity, Fair Value | 6,634 |  | 6,989 |  |  |
Securities held-to-maturity, Gross Unrecognized Losses | 1,226 |  | 886 |  |  |
Securities available-for-sale, Amortized Cost excluding portfolio layer adjustments | 421,820 |  |  |  |  |
Securities available-for-sale |  |  | 454,320 |  |  |
Securities, available-for-sale, Fair Value | 337,879 |  | 384,283 |  |  |
Securities available for sale, Gross Unrealized Gains | 1 |  | 3 |  |  |
Securities available-for-sale, Gross Unrealized Losses excluding portfolio layer adjustments | 83,942 |  |  |  |  |
Securities available for sale, Gross Unrealized Losses |  |  | 70,040 |  |  |
REMIC and CMO [Member] |  |  |  |  |  |
Securities available-for-sale, Amortized Cost excluding portfolio layer adjustments | 164,303 |  |  |  |  |
Securities available-for-sale |  |  | 175,712 |  |  |
Securities, available-for-sale, Fair Value | 131,476 |  | 148,414 |  |  |
Securities available for sale, Gross Unrealized Gains | 0 |  | 0 |  |  |
Securities available-for-sale, Gross Unrealized Losses excluding portfolio layer adjustments | 32,827 |  |  |  |  |
Securities available for sale, Gross Unrealized Losses |  |  | 27,298 |  |  |
GNMA [Member] |  |  |  |  |  |
Securities available-for-sale, Amortized Cost excluding portfolio layer adjustments | 8,678 |  |  |  |  |
Securities available-for-sale |  |  | 9,193 |  |  |
Securities, available-for-sale, Fair Value | 6,542 |  | 7,317 |  |  |
Securities available for sale, Gross Unrealized Gains | 1 |  | 3 |  |  |
Securities available-for-sale, Gross Unrealized Losses excluding portfolio layer adjustments | 2,137 |  |  |  |  |
Securities available for sale, Gross Unrealized Losses |  |  | 1,879 |  |  |
FNMA [Member] |  |  |  |  |  |
Securities, held-to-maturity, Amortized Cost | 7,860 |  | 7,875 |  |  |
Securities held-to-maturity, Fair Value | 6,634 |  | 6,989 |  |  |
Securities held-to-maturity, Gross Unrecognized Losses | 1,226 |  | 886 |  |  |
Securities available-for-sale, Amortized Cost excluding portfolio layer adjustments | 157,897 |  |  |  |  |
Securities available-for-sale |  |  | 172,690 |  |  |
Securities, available-for-sale, Fair Value | 128,781 |  | 148,265 |  |  |
Securities available for sale, Gross Unrealized Gains | 0 |  | 0 |  |  |
Securities available-for-sale, Gross Unrealized Losses excluding portfolio layer adjustments | 29,116 |  |  |  |  |
Securities available for sale, Gross Unrealized Losses |  |  | 24,425 |  |  |
FHLMC [Member] |  |  |  |  |  |
Securities available-for-sale, Amortized Cost excluding portfolio layer adjustments | 90,942 |  |  |  |  |
Securities available-for-sale |  |  | 96,725 |  |  |
Securities, available-for-sale, Fair Value | 71,080 |  | 80,287 |  |  |
Securities available for sale, Gross Unrealized Gains | 0 |  | 0 |  |  |
Securities available-for-sale, Gross Unrealized Losses excluding portfolio layer adjustments | 19,862 |  |  |  |  |
Securities available for sale, Gross Unrealized Losses |  |  | 16,438 |  |  |
Available for Sale Securities Excluding Mortgage Backed Securities [Member] |  |  |  |  |  |
Securities available-for-sale, Amortized Cost excluding portfolio layer adjustments | 529,420 |  |  |  |  |
Securities available-for-sale |  |  | 372,561 |  |  |
Securities, available-for-sale, Fair Value | 505,784 |  | 351,074 |  |  |
Securities available for sale, Gross Unrealized Gains | 549 |  | 2 |  |  |
Securities available-for-sale, Gross Unrealized Losses excluding portfolio layer adjustments | $ 24,185 |  |  |  |  |
Securities available for sale, Gross Unrealized Losses |  |  | $ 21,489 |  |  |

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