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Securities - Amortized Cost and Fair Value of Securities (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020 | Mar. 31, 2020
--- | --- | --- | ---
Securities held-to-maturity, amortized cost | $ 58,736 |  |
Securities held-to-maturity, amortized cost | 57,821 | $ 57,832 |
Securities held-to-maturity, fair value | 61,035 | 63,529 |
Securities held-to-maturity, gross Unrecognized gains | 2,564 | 4,790 |
Securities held-to-maturity, gross Unrecognized losses | 265 |  |
Securities held-to-maturity, allowance for credit losses | (915) | (907) |
Securities available for sale, amortized cost, total other securities | 762,561 | 646,112 |
Securities available for sale, fair value | 761,221 | 647,974 |
Securities available for sale, gross unrealized gains | 6,488 | 9,628 |
Securities available for sale, gross unrealized losses | 7,828 | 7,766 |
Other Securities [Member] |  |  |
Securities available for sale, amortized cost, total other securities | 1,342 | 1,295 |
Securities available for sale, fair value | 1,342 | 1,295 |
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 | 6,253 | 6,452 |
Securities available for sale, fair value | 6,219 | 6,453 |
Securities available for sale, gross unrealized gains | 0 | 2 |
Securities available for sale, gross unrealized losses | 34 | 1 |
Corporate Debt Securities [Member] |  |  |
Securities available for sale, amortized cost, total other securities | 130,000 | 130,000 |
Securities available for sale, fair value | 129,598 | 123,865 |
Securities available for sale, gross unrealized gains | 538 | 131 |
Securities available for sale, gross unrealized losses | 940 | 6,266 |
US States and Political Subdivisions Debt Securities [Member] |  |  |
Securities held-to-maturity, amortized cost | 50,827 | 50,825 |
Securities held-to-maturity, fair value | 52,543 | 54,538 |
Securities held-to-maturity, gross Unrecognized gains | 1,981 | 3,713 |
Securities held-to-maturity, gross Unrecognized losses | 265 |  |
Mutual Fund Debt Securities [Member] |  |  |
Securities available for sale, amortized cost, total other securities | 12,525 | 12,703 |
Securities available for sale, fair value | 12,525 | 12,703 |
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 | 93,120 | 100,561 |
Securities available for sale, fair value | 92,756 | 99,198 |
Securities available for sale, gross unrealized gains | 40 | 0 |
Securities available for sale, gross unrealized losses | 404 | 1,363 |
Other Debt Obligations [Member] |  |  |
Securities held-to-maturity, amortized cost | 50,827 | 50,825 |
Securities held-to-maturity, amortized cost | 49,912 | 49,918 |
Securities held-to-maturity, fair value | 52,543 | 54,538 |
Securities held-to-maturity, gross Unrecognized gains | 1,981 | 3,713 |
Securities held-to-maturity, gross Unrecognized losses | 265 |  |
Securities held-to-maturity, allowance for credit losses | (915) | (907) | $ (402)
Securities available for sale, fair value | 242,440 | 243,514 |
Collateralized Mortgage Backed Securities [Member] |  |  |
Securities held-to-maturity, amortized cost | 7,909 | 7,914 |
Securities held-to-maturity, amortized cost | 7,909 | 7,914 |
Securities held-to-maturity, fair value | 8,492 | 8,991 |
Securities held-to-maturity, gross Unrecognized gains | 583 | 1,077 |
Securities held-to-maturity, gross Unrecognized losses | 0 |  |
Securities available for sale, amortized cost, total other securities | 519,321 | 395,101 |
Securities available for sale, fair value | 518,781 | 404,460 |
Securities available for sale, gross unrealized gains | 5,910 | 9,495 |
Securities available for sale, gross unrealized losses | 6,450 | 136 |
REMIC and CMO [Member] |  |  |
Securities available for sale, amortized cost, total other securities | 210,836 | 175,142 |
Securities available for sale, fair value | 213,146 | 180,877 |
Securities available for sale, gross unrealized gains | 3,570 | 5,735 |
Securities available for sale, gross unrealized losses | 1,260 | 0 |
GNMA [Member] |  |  |
Securities available for sale, amortized cost, total other securities | 12,600 | 13,009 |
Securities available for sale, fair value | 12,339 | 13,053 |
Securities available for sale, gross unrealized gains | 51 | 66 |
Securities available for sale, gross unrealized losses | 312 | 22 |
FNMA [Member] |  |  |
Securities held-to-maturity, amortized cost | 7,909 | 7,914 |
Securities held-to-maturity, fair value | 8,492 | 8,991 |
Securities held-to-maturity, gross Unrecognized gains | 583 | 1,077 |
Securities held-to-maturity, gross Unrecognized losses | 0 |  |
Securities available for sale, amortized cost, total other securities | 171,453 | 143,154 |
Securities available for sale, fair value | 171,074 | 146,169 |
Securities available for sale, gross unrealized gains | 1,817 | 3,046 |
Securities available for sale, gross unrealized losses | 2,196 | 31 |
FHLMC [Member] |  |  |
Securities available for sale, amortized cost, total other securities | 124,432 | 63,796 |
Securities available for sale, fair value | 122,222 | 64,361 |
Securities available for sale, gross unrealized gains | 472 | 648 |
Securities available for sale, gross unrealized losses | 2,682 | 83 |
Available for Sale Securities Excluding Mortgage Backed Securities [Member] |  |  |
Securities available for sale, amortized cost, total other securities | 243,240 | 251,011 |
Securities available for sale, fair value | 242,440 | 243,514 |
Securities available for sale, gross unrealized gains | 578 | 133 |
Securities available for sale, gross unrealized losses | $ 1,378 | $ 7,630 |

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