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Securities - Amortized Cost and Fair Value of Securities (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Jun. 30, 2021 | Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Dec. 31, 2019
--- | --- | --- | --- | --- | --- | ---
Securities held-to-maturity, amortized cost | $ 58,731 |  |  |  |  |
Securities held-to-maturity, amortized cost | 57,888 |  | $ 57,832 |  |  |
Securities held-to-maturity, fair value | 61,451 |  | 63,529 |  |  |
Securities held-to-maturity, gross Unrecognized gains | 2,877 |  | 4,790 |  |  |
Securities held-to-maturity, gross Unrecognized losses | 157 |  |  |  |  |
Securities held-to-maturity, allowance for credit losses | (843) | $ (844) | (907) | $ (402) | $ (402) | $ (340)
Securities available for sale, amortized cost, total other securities | 799,936 |  | 646,112 |  |  |
Securities available for sale, fair value | 796,799 |  | 647,974 |  |  |
Securities available for sale, gross unrealized gains | 4,869 |  | 9,628 |  |  |
Securities available for sale, gross unrealized losses | 8,006 |  | 7,766 |  |  |
Other Securities [Member] |  |  |  |  |  |
Securities available for sale, amortized cost, total other securities | 1,548 |  | 1,295 |  |  |
Securities available for sale, fair value | 1,548 |  | 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 | 5,643 |  | 6,452 |  |  |
Securities available for sale, fair value | 5,645 |  | 6,453 |  |  |
Securities available for sale, gross unrealized gains | 5 |  | 2 |  |  |
Securities available for sale, gross unrealized losses | 3 |  | 1 |  |  |
Corporate Debt Securities [Member] |  |  |  |  |  |
Securities available for sale, amortized cost, total other securities | 107,421 |  | 130,000 |  |  |
Securities available for sale, fair value | 105,956 |  | 123,865 |  |  |
Securities available for sale, gross unrealized gains | 189 |  | 131 |  |  |
Securities available for sale, gross unrealized losses | 1,654 |  | 6,266 |  |  |
US States and Political Subdivisions Debt Securities [Member] |  |  |  |  |  |
Securities held-to-maturity, amortized cost | 50,832 |  | 50,825 |  |  |
Securities held-to-maturity, fair value | 52,753 |  | 54,538 |  |  |
Securities held-to-maturity, gross Unrecognized gains | 2,078 |  | 3,713 |  |  |
Securities held-to-maturity, gross Unrecognized losses | 157 |  |  |  |  |
Mutual Fund Debt Securities [Member] |  |  |  |  |  |
Securities available for sale, amortized cost, total other securities | 12,572 |  | 12,703 |  |  |
Securities available for sale, fair value | 12,572 |  | 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 | 87,167 |  | 100,561 |  |  |
Securities available for sale, fair value | 86,933 |  | 99,198 |  |  |
Securities available for sale, gross unrealized gains | 5 |  | 0 |  |  |
Securities available for sale, gross unrealized losses | 239 |  | 1,363 |  |  |
Other Debt Obligations [Member] |  |  |  |  |  |
Securities held-to-maturity, amortized cost | 50,832 |  | 50,825 |  |  |
Securities held-to-maturity, amortized cost | 49,989 |  | 49,918 |  |  |
Securities held-to-maturity, fair value | 52,753 |  | 54,538 |  |  |
Securities held-to-maturity, gross Unrecognized gains | 2,078 |  | 3,713 |  |  |
Securities held-to-maturity, gross Unrecognized losses | 157 |  |  |  |  |
Securities held-to-maturity, allowance for credit losses | (843) |  | (907) |  |  |
Securities available for sale, fair value | 212,654 |  | 243,514 |  |  |
Collateralized Mortgage Backed Securities [Member] |  |  |  |  |  |
Securities held-to-maturity, amortized cost | 7,899 |  | 7,914 |  |  |
Securities held-to-maturity, amortized cost | 7,899 |  | 7,914 |  |  |
Securities held-to-maturity, fair value | 8,698 |  | 8,991 |  |  |
Securities held-to-maturity, gross Unrecognized gains | 799 |  | 1,077 |  |  |
Securities held-to-maturity, gross Unrecognized losses | 0 |  |  |  |  |
Securities available for sale, amortized cost, total other securities | 585,585 |  | 395,101 |  |  |
Securities available for sale, fair value | 584,145 |  | 404,460 |  |  |
Securities available for sale, gross unrealized gains | 4,670 |  | 9,495 |  |  |
Securities available for sale, gross unrealized losses | 6,110 |  | 136 |  |  |
REMIC and CMO [Member] |  |  |  |  |  |
Securities available for sale, amortized cost, total other securities | 229,499 |  | 175,142 |  |  |
Securities available for sale, fair value | 229,890 |  | 180,877 |  |  |
Securities available for sale, gross unrealized gains | 2,372 |  | 5,735 |  |  |
Securities available for sale, gross unrealized losses | 1,981 |  | 0 |  |  |
GNMA [Member] |  |  |  |  |  |
Securities available for sale, amortized cost, total other securities | 11,362 |  | 13,009 |  |  |
Securities available for sale, fair value | 11,088 |  | 13,053 |  |  |
Securities available for sale, gross unrealized gains | 38 |  | 66 |  |  |
Securities available for sale, gross unrealized losses | 312 |  | 22 |  |  |
FNMA [Member] |  |  |  |  |  |
Securities held-to-maturity, amortized cost | 7,899 |  | 7,914 |  |  |
Securities held-to-maturity, fair value | 8,698 |  | 8,991 |  |  |
Securities held-to-maturity, gross Unrecognized gains | 799 |  | 1,077 |  |  |
Securities held-to-maturity, gross Unrecognized losses | 0 |  |  |  |  |
Securities available for sale, amortized cost, total other securities | 194,973 |  | 143,154 |  |  |
Securities available for sale, fair value | 195,030 |  | 146,169 |  |  |
Securities available for sale, gross unrealized gains | 1,815 |  | 3,046 |  |  |
Securities available for sale, gross unrealized losses | 1,758 |  | 31 |  |  |
FHLMC [Member] |  |  |  |  |  |
Securities available for sale, amortized cost, total other securities | 149,751 |  | 63,796 |  |  |
Securities available for sale, fair value | 148,137 |  | 64,361 |  |  |
Securities available for sale, gross unrealized gains | 445 |  | 648 |  |  |
Securities available for sale, gross unrealized losses | 2,059 |  | 83 |  |  |
Available for Sale Securities Excluding Mortgage Backed Securities [Member] |  |  |  |  |  |
Securities available for sale, amortized cost, total other securities | 214,351 |  | 251,011 |  |  |
Securities available for sale, fair value | 212,654 |  | 243,514 |  |  |
Securities available for sale, gross unrealized gains | 199 |  | 133 |  |  |
Securities available for sale, gross unrealized losses | $ 1,896 |  | $ 7,630 |  |  |

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