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Securities - Amortized Cost and Fair Value of Securities (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | --- | --- | --- | --- | ---
Securities held-to-maturity, amortized cost | $ 58,734 |  |  |  |  |
Securities held-to-maturity, amortized cost | 57,890 |  | $ 57,832 |  |  |
Securities held-to-maturity, fair value | 62,446 |  | 63,529 |  |  |
Securities held-to-maturity, gross Unrecognized gains | 3,712 |  | 4,790 |  |  |
Securities held-to-maturity, gross Unrecognized losses | 0 |  |  |  |  |
Securities held-to-maturity, allowance for credit losses | (844) | $ (915) | (907) | $ (402) | $ (402) | $ (340)
Securities available for sale, amortized cost, total other securities | 820,738 |  | 646,112 |  |  |
Securities available for sale, fair value | 821,445 |  | 647,974 |  |  |
Securities available for sale, gross unrealized gains | 5,947 |  | 9,628 |  |  |
Securities available for sale, gross unrealized losses | 5,240 |  | 7,766 |  |  |
Other Securities [Member] |  |  |  |  |  |
Securities available for sale, amortized cost, total other securities | 1,495 |  | 1,295 |  |  |
Securities available for sale, fair value | 1,495 |  | 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 | 6,206 |  | 6,452 |  |  |
Securities available for sale, fair value | 6,218 |  | 6,453 |  |  |
Securities available for sale, gross unrealized gains | 15 |  | 2 |  |  |
Securities available for sale, gross unrealized losses | 3 |  | 1 |  |  |
Corporate Debt Securities [Member] |  |  |  |  |  |
Securities available for sale, amortized cost, total other securities | 117,420 |  | 130,000 |  |  |
Securities available for sale, fair value | 117,602 |  | 123,865 |  |  |
Securities available for sale, gross unrealized gains | 461 |  | 131 |  |  |
Securities available for sale, gross unrealized losses | 279 |  | 6,266 |  |  |
US States and Political Subdivisions Debt Securities [Member] |  |  |  |  |  |
Securities held-to-maturity, amortized cost | 50,830 |  | 50,825 |  |  |
Securities held-to-maturity, fair value | 53,598 |  | 54,538 |  |  |
Securities held-to-maturity, gross Unrecognized gains | 2,768 |  | 3,713 |  |  |
Securities held-to-maturity, gross Unrecognized losses | 0 |  |  |  |  |
Mutual Fund Debt Securities [Member] |  |  |  |  |  |
Securities available for sale, amortized cost, total other securities | 12,585 |  | 12,703 |  |  |
Securities available for sale, fair value | 12,585 |  | 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 | 87,148 |  | 100,561 |  |  |
Securities available for sale, fair value | 86,884 |  | 99,198 |  |  |
Securities available for sale, gross unrealized gains | 18 |  | 0 |  |  |
Securities available for sale, gross unrealized losses | 282 |  | 1,363 |  |  |
Other Debt Obligations [Member] |  |  |  |  |  |
Securities held-to-maturity, amortized cost | 50,830 |  | 50,825 |  |  |
Securities held-to-maturity, amortized cost | 49,986 |  | 49,918 |  |  |
Securities held-to-maturity, fair value | 53,598 |  | 54,538 |  |  |
Securities held-to-maturity, gross Unrecognized gains | 2,768 |  | 3,713 |  |  |
Securities held-to-maturity, gross Unrecognized losses | 0 |  |  |  |  |
Securities held-to-maturity, allowance for credit losses | (844) |  | (907) |  |  |
Securities available for sale, fair value | 224,784 |  | 243,514 |  |  |
Collateralized Mortgage Backed Securities [Member] |  |  |  |  |  |
Securities held-to-maturity, amortized cost | 7,904 |  | 7,914 |  |  |
Securities held-to-maturity, amortized cost | 7,904 |  | 7,914 |  |  |
Securities held-to-maturity, fair value | 8,848 |  | 8,991 |  |  |
Securities held-to-maturity, gross Unrecognized gains | 944 |  | 1,077 |  |  |
Securities held-to-maturity, gross Unrecognized losses | 0 |  |  |  |  |
Securities available for sale, amortized cost, total other securities | 595,884 |  | 395,101 |  |  |
Securities available for sale, fair value | 596,661 |  | 404,460 |  |  |
Securities available for sale, gross unrealized gains | 5,453 |  | 9,495 |  |  |
Securities available for sale, gross unrealized losses | 4,676 |  | 136 |  |  |
REMIC and CMO [Member] |  |  |  |  |  |
Securities available for sale, amortized cost, total other securities | 222,748 |  | 175,142 |  |  |
Securities available for sale, fair value | 224,065 |  | 180,877 |  |  |
Securities available for sale, gross unrealized gains | 3,042 |  | 5,735 |  |  |
Securities available for sale, gross unrealized losses | 1,725 |  | 0 |  |  |
GNMA [Member] |  |  |  |  |  |
Securities available for sale, amortized cost, total other securities | 12,033 |  | 13,009 |  |  |
Securities available for sale, fair value | 11,802 |  | 13,053 |  |  |
Securities available for sale, gross unrealized gains | 39 |  | 66 |  |  |
Securities available for sale, gross unrealized losses | 270 |  | 22 |  |  |
FNMA [Member] |  |  |  |  |  |
Securities held-to-maturity, amortized cost | 7,904 |  | 7,914 |  |  |
Securities held-to-maturity, fair value | 8,848 |  | 8,991 |  |  |
Securities held-to-maturity, gross Unrecognized gains | 944 |  | 1,077 |  |  |
Securities held-to-maturity, gross Unrecognized losses | 0 |  |  |  |  |
Securities available for sale, amortized cost, total other securities | 205,159 |  | 143,154 |  |  |
Securities available for sale, fair value | 205,782 |  | 146,169 |  |  |
Securities available for sale, gross unrealized gains | 1,783 |  | 3,046 |  |  |
Securities available for sale, gross unrealized losses | 1,160 |  | 31 |  |  |
FHLMC [Member] |  |  |  |  |  |
Securities available for sale, amortized cost, total other securities | 155,944 |  | 63,796 |  |  |
Securities available for sale, fair value | 155,012 |  | 64,361 |  |  |
Securities available for sale, gross unrealized gains | 589 |  | 648 |  |  |
Securities available for sale, gross unrealized losses | 1,521 |  | 83 |  |  |
Available for Sale Securities Excluding Mortgage Backed Securities [Member] |  |  |  |  |  |
Securities available for sale, amortized cost, total other securities | 224,854 |  | 251,011 |  |  |
Securities available for sale, fair value | 224,784 |  | 243,514 |  |  |
Securities available for sale, gross unrealized gains | 494 |  | 133 |  |  |
Securities available for sale, gross unrealized losses | $ 564 |  | $ 7,630 |  |  |

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