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Securities - Amortized Cost and Fair Value of Securities (Details) - USD ($) $ in Thousands | Jun. 30, 2023 | Mar. 31, 2023 | Dec. 31, 2022 | Jun. 30, 2022 | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | --- | --- | --- | --- | ---
Securities, held-to-maturity, Amortized Cost | $ 74,413 |  |  |  |  |
Securities held-to-maturity, Fair Value | 64,337 |  | $ 62,550 |  |  |
Securities held-to-maturity, Gross Unrecognized Losses | 10,076 |  | 12,261 |  |  |
Securities held-to-maturity, Allowance for credit losses | (1,079) | $ (1,087) | (1,100) | $ (1,085) | $ (986) | $ (862)
Securities held-to-maturity | 73,334 |  | 73,711 |  |  |
Securities available-for-sale, Amortized Cost excluding portfolio layer adjustments | 967,095 |  |  |  |  |
Securities, available-for-sale, Unallocated portfolio layer basis adjustments | (5,504) |  |  |  |  |
Securities available-for-sale | 961,591 |  | 826,881 |  |  |
Securities, available-for-sale, Fair Value | 869,556 |  | 735,357 |  |  |
Securities available for sale, Gross Unrealized Gains | 210 |  | 5 |  |  |
Securities available-for-sale, Gross Unrealized Losses excluding portfolio layer adjustments | 97,749 |  |  |  |  |
Securities available for sale, Gross Unrealized Losses | 92,245 |  | 91,529 |  |  |
Other Securities [Member] |  |  |  |  |  |
Securities available-for-sale, Amortized Cost excluding portfolio layer adjustments | 1,434 |  |  |  |  |
Securities available-for-sale |  |  | 1,516 |  |  |
Securities, available-for-sale, Fair Value | 1,434 |  | 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 | 83,339 |  |  |  |  |
Securities available-for-sale |  |  | 83,720 |  |  |
Securities, available-for-sale, Fair Value | 81,290 |  | 81,103 |  |  |
Securities available for sale, Gross Unrealized Gains | 151 |  | 2 |  |  |
Securities available-for-sale, Gross Unrealized Losses excluding portfolio layer adjustments | 2,200 |  |  |  |  |
Securities available for sale, Gross Unrealized Losses |  |  | 2,619 |  |  |
Corporate Debt Securities [Member] |  |  |  |  |  |
Securities available-for-sale, Amortized Cost excluding portfolio layer adjustments | 173,095 |  |  |  |  |
Securities available-for-sale |  |  | 146,430 |  |  |
Securities, available-for-sale, Fair Value | 150,602 |  | 131,766 |  |  |
Securities available for sale, Gross Unrealized Gains | 0 |  | 0 |  |  |
Securities available-for-sale, Gross Unrealized Losses excluding portfolio layer adjustments | 22,493 |  |  |  |  |
Securities available for sale, Gross Unrealized Losses |  |  | 14,664 |  |  |
US States and Political Subdivisions Debt Securities [Member] |  |  |  |  |  |
Securities, held-to-maturity, Amortized Cost | 66,548 |  | 66,936 |  |  |
Securities held-to-maturity, Fair Value | 57,326 |  | 55,561 |  |  |
Securities held-to-maturity, Gross Unrecognized Losses | 9,222 |  | 11,375 |  |  |
Mutual Fund Debt Securities [Member] |  |  |  |  |  |
Securities available-for-sale, Amortized Cost excluding portfolio layer adjustments | 11,346 |  |  |  |  |
Securities available-for-sale |  |  | 11,211 |  |  |
Securities, available-for-sale, Fair Value | 11,346 |  | 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 | 262,471 |  |  |  |  |
Securities available-for-sale |  |  | 129,684 |  |  |
Securities, available-for-sale, Fair Value | 258,973 |  | 125,478 |  |  |
Securities available for sale, Gross Unrealized Gains | 58 |  | 0 |  |  |
Securities available-for-sale, Gross Unrealized Losses excluding portfolio layer adjustments | 3,556 |  |  |  |  |
Securities available for sale, Gross Unrealized Losses |  |  | 4,206 |  |  |
Other Debt Obligations |  |  |  |  |  |
Securities, held-to-maturity, Amortized Cost | 66,548 |  | 66,936 |  |  |
Securities held-to-maturity, Fair Value | 57,326 |  | 55,561 |  |  |
Securities held-to-maturity, Gross Unrecognized Losses | 9,222 |  | 11,375 |  |  |
Collateralized Mortgage Backed Securities |  |  |  |  |  |
Securities, held-to-maturity, Amortized Cost | 7,865 |  | 7,875 |  |  |
Securities held-to-maturity, Fair Value | 7,011 |  | 6,989 |  |  |
Securities held-to-maturity, Gross Unrecognized Losses | 854 |  | 886 |  |  |
Securities available-for-sale, Amortized Cost excluding portfolio layer adjustments | 435,410 |  |  |  |  |
Securities available-for-sale |  |  | 454,320 |  |  |
Securities, available-for-sale, Fair Value | 365,911 |  | 384,283 |  |  |
Securities available for sale, Gross Unrealized Gains | 1 |  | 3 |  |  |
Securities available-for-sale, Gross Unrealized Losses excluding portfolio layer adjustments | 69,500 |  |  |  |  |
Securities available for sale, Gross Unrealized Losses |  |  | 70,040 |  |  |
REMIC and CMO [Member] |  |  |  |  |  |
Securities available-for-sale, Amortized Cost excluding portfolio layer adjustments | 168,675 |  |  |  |  |
Securities available-for-sale |  |  | 175,712 |  |  |
Securities, available-for-sale, Fair Value | 140,161 |  | 148,414 |  |  |
Securities available for sale, Gross Unrealized Gains | 0 |  | 0 |  |  |
Securities available-for-sale, Gross Unrealized Losses excluding portfolio layer adjustments | 28,514 |  |  |  |  |
Securities available for sale, Gross Unrealized Losses |  |  | 27,298 |  |  |
GNMA [Member] |  |  |  |  |  |
Securities available-for-sale, Amortized Cost excluding portfolio layer adjustments | 8,861 |  |  |  |  |
Securities available-for-sale |  |  | 9,193 |  |  |
Securities, available-for-sale, Fair Value | 7,079 |  | 7,317 |  |  |
Securities available for sale, Gross Unrealized Gains | 1 |  | 3 |  |  |
Securities available-for-sale, Gross Unrealized Losses excluding portfolio layer adjustments | 1,783 |  |  |  |  |
Securities available for sale, Gross Unrealized Losses |  |  | 1,879 |  |  |
FNMA [Member] |  |  |  |  |  |
Securities, held-to-maturity, Amortized Cost | 7,865 |  | 7,875 |  |  |
Securities held-to-maturity, Fair Value | 7,011 |  | 6,989 |  |  |
Securities held-to-maturity, Gross Unrecognized Losses | 854 |  | 886 |  |  |
Securities available-for-sale, Amortized Cost excluding portfolio layer adjustments | 165,064 |  |  |  |  |
Securities available-for-sale |  |  | 172,690 |  |  |
Securities, available-for-sale, Fair Value | 141,717 |  | 148,265 |  |  |
Securities available for sale, Gross Unrealized Gains | 0 |  | 0 |  |  |
Securities available-for-sale, Gross Unrealized Losses excluding portfolio layer adjustments | 23,347 |  |  |  |  |
Securities available for sale, Gross Unrealized Losses |  |  | 24,425 |  |  |
FHLMC [Member] |  |  |  |  |  |
Securities available-for-sale, Amortized Cost excluding portfolio layer adjustments | 92,810 |  |  |  |  |
Securities available-for-sale |  |  | 96,725 |  |  |
Securities, available-for-sale, Fair Value | 76,954 |  | 80,287 |  |  |
Securities available for sale, Gross Unrealized Gains | 0 |  | 0 |  |  |
Securities available-for-sale, Gross Unrealized Losses excluding portfolio layer adjustments | 15,856 |  |  |  |  |
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 | 531,685 |  |  |  |  |
Securities available-for-sale |  |  | 372,561 |  |  |
Securities, available-for-sale, Fair Value | 503,645 |  | 351,074 |  |  |
Securities available for sale, Gross Unrealized Gains | 209 |  | 2 |  |  |
Securities available-for-sale, Gross Unrealized Losses excluding portfolio layer adjustments | $ 28,249 |  |  |  |  |
Securities available for sale, Gross Unrealized Losses |  |  | $ 21,489 |  |  |

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