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Securities - Amortized Cost and Fair Value of Securities (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Securities held-to-maturity, amortized cost | $ 58,888 | $ 32,018
Securities held-to-maturity, fair value | 62,112 | 29,874
Securities held-to-maturity, gross unrealized gains | 3,224 | 0
Securities held-to-maturity, gross unrealized losses | 0 | 2,144
Securities available for sale, amortized cost, total other securities | 778,294 | 845,332
Securities available for sale, fair value | 772,500 | 822,655
Securities available for sale, gross unrealized gains | 4,307 | 1,454
Securities available for sale, gross unrealized losses | 10,101 | 24,131
Corporate Debt Securities [Member] |  |
Securities available for sale, amortized cost, total other securities | 130,000 | 130,000
Securities available for sale, fair value | 123,050 | 118,535
Securities available for sale, gross unrealized gains | 0 | 0
Securities available for sale, gross unrealized losses | 6,950 | 11,465
US States and Political Subdivisions Debt Securities [Member] |  |
Securities held-to-maturity, amortized cost | 50,954 | 24,065
Securities held-to-maturity, fair value | 53,998 | 22,508
Securities held-to-maturity, gross unrealized gains | 3,044 | 0
Securities held-to-maturity, gross unrealized losses | 0 | 1,557
Securities available for sale, amortized cost, total other securities | 12,797 | 46,231
Securities available for sale, fair value | 12,916 | 46,574
Securities available for sale, gross unrealized gains | 119 | 343
Securities available for sale, gross unrealized losses | 0 | 0
Other Debt Obligations [Member] |  |
Securities held-to-maturity, amortized cost | 50,954 | 24,065
Securities held-to-maturity, fair value | 53,998 | 22,508
Securities held-to-maturity, gross unrealized gains | 3,044 | 0
Securities held-to-maturity, gross unrealized losses | 0 | 1,557
Securities available for sale, fair value | 248,651 | 264,702
Mutual Fund Debt Securities [Member] |  |
Securities available for sale, amortized cost, total other securities | 12,216 | 11,586
Securities available for sale, fair value | 12,216 | 11,586
Securities available for sale, gross unrealized gains | 0 | 0
Securities available for sale, gross unrealized losses | 0 | 0
FNMA [Member] |  |
Securities held-to-maturity, amortized cost | 7,934 | 7,953
Securities held-to-maturity, fair value | 8,114 | 7,366
Securities held-to-maturity, gross unrealized gains | 180 | 0
Securities held-to-maturity, gross unrealized losses | 0 | 587
Securities available for sale, amortized cost, total other securities | 104,235 | 94,069
Securities available for sale, fair value | 104,882 | 91,693
Securities available for sale, gross unrealized gains | 1,073 | 72
Securities available for sale, gross unrealized losses | 426 | 2,448
Collateralized Debt Obligations [Member] |  |
Securities available for sale, amortized cost, total other securities | 100,349 | 88,396
Securities available for sale, fair value | 99,137 | 86,751
Securities available for sale, gross unrealized gains | 0 | 0
Securities available for sale, gross unrealized losses | 1,212 | 1,645
Collateralized Mortgage Backed Securities [Member] |  |
Securities held-to-maturity, amortized cost | 7,934 | 7,953
Securities held-to-maturity, fair value | 8,114 | 7,366
Securities held-to-maturity, gross unrealized gains | 180 | 0
Securities held-to-maturity, gross unrealized losses | 0 | 587
Securities available for sale, amortized cost, total other securities | 521,600 | 567,863
Securities available for sale, fair value | 523,849 | 557,953
Securities available for sale, gross unrealized gains | 4,188 | 1,111
Securities available for sale, gross unrealized losses | 1,939 | 11,021
Other Securities [Member] |  |
Securities available for sale, amortized cost, total other securities | 1,332 | 1,256
Securities available for sale, fair value | 1,332 | 1,256
Securities available for sale, gross unrealized gains | 0 | 0
Securities available for sale, gross unrealized losses | 0 | 0
Available for Sale Securities Excluding Mortgage Backed Securities [Member] |  |
Securities available for sale, amortized cost, total other securities | 256,694 | 277,469
Securities available for sale, fair value | 248,651 | 264,702
Securities available for sale, gross unrealized gains | 119 | 343
Securities available for sale, gross unrealized losses | 8,162 | 13,110
REMIC and CMO [Member] |  |
Securities available for sale, amortized cost, total other securities | 348,236 | 382,632
Securities available for sale, fair value | 348,989 | 376,340
Securities available for sale, gross unrealized gains | 2,193 | 885
Securities available for sale, gross unrealized losses | 1,440 | 7,177
GNMA [Member] |  |
Securities available for sale, amortized cost, total other securities | 653 | 785
Securities available for sale, fair value | 704 | 826
Securities available for sale, gross unrealized gains | 51 | 41
Securities available for sale, gross unrealized losses | 0 | 0
FHLMC [Member] |  |
Securities available for sale, amortized cost, total other securities | 68,476 | 90,377
Securities available for sale, fair value | 69,274 | 89,094
Securities available for sale, gross unrealized gains | 871 | 113
Securities available for sale, gross unrealized losses | $ 73 | $ 1,396

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