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Securities - Amortized Cost and Fair Value of Securities (Details) - USD ($) $ in Thousands | Mar. 31, 2023 | Dec. 31, 2022 | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | --- | --- | ---
Securities held-to-maturity, amortized cost | $ 74,610 |  |  |
Securities held-to-maturity, amortized cost | 73,523 | $ 73,711 |  |
Securities held-to-maturity, fair value | 67,869 | 62,550 |  |
Securities held-to-maturity, gross Unrecognized losses | 6,741 | 12,261 |  |
Securities held-to-maturity, allowance for credit losses | (1,087) | (1,100) | $ (986) | $ (862)
Securities available for sale, amortized cost, total other securities | 898,819 | 826,881 |  |
Securities available for sale, at fair value: (assets pledged of $193,558 and $172,235, respectively; $13,192 and $13,023 at fair value pursuant to the fair value option, respectively) | 811,928 | 735,357 |  |
Securities available for sale, gross unrealized gains | 175 | 5 |  |
Securities available for sale, gross unrealized losses | 87,066 | 91,529 |  |
Other Securities [Member] |  |  |  |
Securities available for sale, amortized cost, total other securities | 1,445 | 1,516 |  |
Securities available for sale, at fair value: (assets pledged of $193,558 and $172,235, respectively; $13,192 and $13,023 at fair value pursuant to the fair value option, respectively) | 1,445 | 1,516 |  |
Securities available for sale, gross unrealized gains | 0 | 0 |  |
Securities available for sale, gross unrealized losses | 0 | 0 |  |
US Government Agencies Debt Securities [Member] |  |  |  |
Securities available for sale, amortized cost, total other securities | 83,691 | 83,720 |  |
Securities available for sale, at fair value: (assets pledged of $193,558 and $172,235, respectively; $13,192 and $13,023 at fair value pursuant to the fair value option, respectively) | 81,802 | 81,103 |  |
Securities available for sale, gross unrealized gains | 171 | 2 |  |
Securities available for sale, gross unrealized losses | 2,060 | 2,619 |  |
Corporate Debt Securities [Member] |  |  |  |
Securities available for sale, amortized cost, total other securities | 173,052 | 146,430 |  |
Securities available for sale, at fair value: (assets pledged of $193,558 and $172,235, respectively; $13,192 and $13,023 at fair value pursuant to the fair value option, respectively) | 156,581 | 131,766 |  |
Securities available for sale, gross unrealized gains | 0 | 0 |  |
Securities available for sale, gross unrealized losses | 16,471 | 14,664 |  |
US States and Political Subdivisions Debt Securities [Member] |  |  |  |
Securities held-to-maturity, amortized cost | 66,740 | 66,936 |  |
Securities held-to-maturity, fair value | 60,732 | 55,561 |  |
Securities held-to-maturity, gross Unrecognized losses | 6,008 | 11,375 |  |
Mutual Fund Debt Securities [Member] |  |  |  |
Securities available for sale, amortized cost, total other securities | 11,460 | 11,211 |  |
Securities available for sale, at fair value: (assets pledged of $193,558 and $172,235, respectively; $13,192 and $13,023 at fair value pursuant to the fair value option, respectively) | 11,460 | 11,211 |  |
Securities available for sale, gross unrealized gains | 0 | 0 |  |
Securities available for sale, gross unrealized losses | 0 | 0 |  |
Collateralized Debt Obligations [Member] |  |  |  |
Securities available for sale, amortized cost, total other securities | 184,773 | 129,684 |  |
Securities available for sale, at fair value: (assets pledged of $193,558 and $172,235, respectively; $13,192 and $13,023 at fair value pursuant to the fair value option, respectively) | 180,530 | 125,478 |  |
Securities available for sale, gross unrealized gains | 0 | 0 |  |
Securities available for sale, gross unrealized losses | 4,243 | 4,206 |  |
Other Debt Obligations |  |  |  |
Securities held-to-maturity, amortized cost | 66,740 | 66,936 |  |
Securities held-to-maturity, fair value | 60,732 | 55,561 |  |
Securities held-to-maturity, gross Unrecognized losses | 6,008 | 11,375 |  |
Collateralized Mortgage Backed Securities |  |  |  |
Securities held-to-maturity, amortized cost | 7,870 | 7,875 |  |
Securities held-to-maturity, amortized cost | 7,870 |  |  |
Securities held-to-maturity, fair value | 7,137 | 6,989 |  |
Securities held-to-maturity, gross Unrecognized losses | 733 | 886 |  |
Securities available for sale, amortized cost, total other securities | 444,398 | 454,320 |  |
Securities available for sale, at fair value: (assets pledged of $193,558 and $172,235, respectively; $13,192 and $13,023 at fair value pursuant to the fair value option, respectively) | 380,110 | 384,283 |  |
Securities available for sale, gross unrealized gains | 4 | 3 |  |
Securities available for sale, gross unrealized losses | 64,292 | 70,040 |  |
REMIC and CMO [Member] |  |  |  |
Securities available for sale, amortized cost, total other securities | 172,001 | 175,712 |  |
Securities available for sale, at fair value: (assets pledged of $193,558 and $172,235, respectively; $13,192 and $13,023 at fair value pursuant to the fair value option, respectively) | 146,318 | 148,414 |  |
Securities available for sale, gross unrealized gains | 0 | 0 |  |
Securities available for sale, gross unrealized losses | 25,683 | 27,298 |  |
GNMA [Member] |  |  |  |
Securities available for sale, amortized cost, total other securities | 9,067 | 9,193 |  |
Securities available for sale, at fair value: (assets pledged of $193,558 and $172,235, respectively; $13,192 and $13,023 at fair value pursuant to the fair value option, respectively) | 7,304 | 7,317 |  |
Securities available for sale, gross unrealized gains | 3 | 3 |  |
Securities available for sale, gross unrealized losses | 1,766 | 1,879 |  |
FNMA [Member] |  |  |  |
Securities held-to-maturity, amortized cost | 7,870 | 7,875 |  |
Securities held-to-maturity, fair value | 7,137 | 6,989 |  |
Securities held-to-maturity, gross Unrecognized losses | 733 | 886 |  |
Securities available for sale, amortized cost, total other securities | 168,689 | 172,690 |  |
Securities available for sale, at fair value: (assets pledged of $193,558 and $172,235, respectively; $13,192 and $13,023 at fair value pursuant to the fair value option, respectively) | 146,633 | 148,265 |  |
Securities available for sale, gross unrealized gains | 1 | 0 |  |
Securities available for sale, gross unrealized losses | 22,057 | 24,425 |  |
FHLMC [Member] |  |  |  |
Securities available for sale, amortized cost, total other securities | 94,641 | 96,725 |  |
Securities available for sale, at fair value: (assets pledged of $193,558 and $172,235, respectively; $13,192 and $13,023 at fair value pursuant to the fair value option, respectively) | 79,855 | 80,287 |  |
Securities available for sale, gross unrealized gains | 0 | 0 |  |
Securities available for sale, gross unrealized losses | 14,786 | 16,438 |  |
Available for Sale Securities Excluding Mortgage Backed Securities [Member] |  |  |  |
Securities available for sale, amortized cost, total other securities | 454,421 | 372,561 |  |
Securities available for sale, at fair value: (assets pledged of $193,558 and $172,235, respectively; $13,192 and $13,023 at fair value pursuant to the fair value option, respectively) | 431,818 | 351,074 |  |
Securities available for sale, gross unrealized gains | 171 | 2 |  |
Securities available for sale, gross unrealized losses | $ 22,774 | $ 21,489 |  |

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