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Securities - Amortized Cost and Fair Value of Securities (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Securities held-to-maturity, amortized cost | $ 58,739 | $ 58,888
Securities held-to-maturity, fair value | 63,529 | 62,112
Securities held-to-maturity, gross Unrecognized gains | 4,790 | 3,224
Securities held-to-maturity, allowance for credit losses | (907) |
Securities available for sale, amortized cost, total other securities | 646,112 | 778,294
Securities available for sale, fair value | 647,974 | 772,500
Securities available for sale, gross unrealized gains | 9,628 | 4,307
Securities available for sale, gross unrealized losses | 7,766 | 10,101
Other Securities [Member] |  |
Securities available for sale, amortized cost, total other securities | 1,295 | 1,332
Securities available for sale, fair value | 1,295 | 1,332
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 | 6,452 |
Securities available for sale, fair value | 6,453 |
Securities available for sale, gross unrealized gains | 2 |
Securities available for sale, gross unrealized losses | 1 |
Corporate Debt Securities [Member] |  |
Securities available for sale, amortized cost, total other securities | 130,000 | 130,000
Securities available for sale, fair value | 123,865 | 123,050
Securities available for sale, gross unrealized gains | 131 | 0
Securities available for sale, gross unrealized losses | 6,266 | 6,950
US States and Political Subdivisions Debt Securities [Member] |  |
Securities held-to-maturity, amortized cost |  | 50,954
Securites held-to-maturity, amortized cost | 50,825 |
Securities held-to-maturity, fair value | 54,538 | 53,998
Securities held-to-maturity, gross Unrecognized gains | 3,713 | 3,044
Securities held-to-maturity, allowance for credit losses | (907) |
Securities available for sale, amortized cost, total other securities |  | 12,797
Securities available for sale, fair value |  | 12,916
Securities available for sale, gross unrealized gains |  | 119
Securities available for sale, gross unrealized losses |  | 0
Mutual Fund Debt Securities [Member] |  |
Securities available for sale, amortized cost, total other securities | 12,703 | 12,216
Securities available for sale, fair value | 12,703 | 12,216
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 | 100,561 | 100,349
Securities available for sale, fair value | 99,198 | 99,137
Securities available for sale, gross unrealized gains | 0 | 0
Securities available for sale, gross unrealized losses | 1,363 | 1,212
Other Debt Obligations [Member] |  |
Securities held-to-maturity, amortized cost | 49,918 | 50,954
Securites held-to-maturity, amortized cost | 50,825 |
Securities held-to-maturity, fair value | 54,538 | 53,998
Securities held-to-maturity, gross Unrecognized gains | 3,713 | 3,044
Securities held-to-maturity, allowance for credit losses | (907) |
Securities available for sale, fair value | 243,514 | 248,651
Collateralized Mortgage Backed Securities [Member] |  |
Securities held-to-maturity, amortized cost | 7,914 | 7,934
Securities held-to-maturity, fair value | 8,991 | 8,114
Securities held-to-maturity, gross Unrecognized gains | 1,077 | 180
Securities held-to-maturity, allowance for credit losses | 0 |
Securities available for sale, amortized cost, total other securities | 395,101 | 521,600
Securities available for sale, fair value | 404,460 | 523,849
Securities available for sale, gross unrealized gains | 9,495 | 4,188
Securities available for sale, gross unrealized losses | 136 | 1,939
REMIC and CMO [Member] |  |
Securities available for sale, amortized cost, total other securities | 175,142 | 348,236
Securities available for sale, fair value | 180,877 | 348,989
Securities available for sale, gross unrealized gains | 5,735 | 2,193
Securities available for sale, gross unrealized losses | 0 | 1,440
GNMA [Member] |  |
Securities available for sale, amortized cost, total other securities | 13,009 | 653
Securities available for sale, fair value | 13,053 | 704
Securities available for sale, gross unrealized gains | 66 | 51
Securities available for sale, gross unrealized losses | 22 | 0
FNMA [Member] |  |
Securities held-to-maturity, amortized cost | 7,914 | 7,934
Securities held-to-maturity, fair value | 8,991 | 8,114
Securities held-to-maturity, gross Unrecognized gains | 1,077 | 180
Securities held-to-maturity, allowance for credit losses | 0 |
Securities available for sale, amortized cost, total other securities | 143,154 | 104,235
Securities available for sale, fair value | 146,169 | 104,882
Securities available for sale, gross unrealized gains | 3,046 | 1,073
Securities available for sale, gross unrealized losses | 31 | 426
FHLMC [Member] |  |
Securities available for sale, amortized cost, total other securities | 63,796 | 68,476
Securities available for sale, fair value | 64,361 | 69,274
Securities available for sale, gross unrealized gains | 648 | 871
Securities available for sale, gross unrealized losses | 83 | 73
Available for Sale Securities Excluding Mortgage Backed Securities [Member] |  |
Securities available for sale, amortized cost, total other securities | 251,011 | 256,694
Securities available for sale, fair value | 243,514 | 248,651
Securities available for sale, gross unrealized gains | 133 | 119
Securities available for sale, gross unrealized losses | $ 7,630 | $ 8,162

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