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Securities - Amortized Cost and Fair Value of Securities (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Securities held-to-maturity, amortized cost | $ 58,556 | $ 58,888
Securities held-to-maturity, fair value | 60,891 | 62,112
Securities held-to-maturity, gross unrealized gains | 2,335 | 3,224
Securities held-to-maturity, gross unrealized losses | 0 |
Securities held-to-maturity, allowance for credit losses | (402) |
Securities available for sale, amortized cost, total other securities | 736,013 | 778,294
Securities available for sale, fair value | 715,412 | 772,500
Securities available for sale, gross unrealized gains | 10,950 | 4,307
Securities available for sale, gross unrealized losses | 31,551 | 10,101
Corporate Debt Securities [Member] |  |
Securities available for sale, amortized cost, total other securities | 130,000 | 130,000
Securities available for sale, fair value | 111,852 | 123,050
Securities available for sale, gross unrealized gains | 0 | 0
Securities available for sale, gross unrealized losses | 18,148 | 6,950
US States and Political Subdivisions Debt Securities [Member] |  |
Securities held-to-maturity, amortized cost | 50,627 | 50,954
Securities held-to-maturity, fair value | 51,938 | 53,998
Securities held-to-maturity, gross unrealized gains | 1,311 | 3,044
Securities held-to-maturity, gross unrealized losses | 0 |
Securities held-to-maturity, allowance for credit losses | (402) |
Securities available for sale, amortized cost, total other securities | 12,743 | 12,797
Securities available for sale, fair value | 12,801 | 12,916
Securities available for sale, gross unrealized gains | 58 | 119
Securities available for sale, gross unrealized losses | 0 | 0
Other Debt Obligations [Member] |  |
Securities held-to-maturity, amortized cost | 50,627 | 50,954
Securities held-to-maturity, fair value | 51,938 | 53,998
Securities held-to-maturity, gross unrealized gains | 1,311 | 3,044
Securities held-to-maturity, gross unrealized losses | 0 |
Securities held-to-maturity, allowance for credit losses | (402) |
Securities available for sale, fair value | 225,856 | 248,651
Mutual Fund Debt Securities [Member] |  |
Securities available for sale, amortized cost, total other securities | 12,476 | 12,216
Securities available for sale, fair value | 12,476 | 12,216
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 | 7,929 | 7,934
Securities held-to-maturity, fair value | 8,953 | 8,114
Securities held-to-maturity, gross unrealized gains | 1,024 | 180
Securities held-to-maturity, gross unrealized losses | 0 |
Securities available for sale, amortized cost, total other securities | 99,676 | 104,235
Securities available for sale, fair value | 102,224 | 104,882
Securities available for sale, gross unrealized gains | 2,572 | 1,073
Securities available for sale, gross unrealized losses | 24 | 426
Collateralized Debt Obligations [Member] |  |
Securities available for sale, amortized cost, total other securities | 100,361 | 100,349
Securities available for sale, fair value | 87,372 | 99,137
Securities available for sale, gross unrealized gains | 0 | 0
Securities available for sale, gross unrealized losses | 12,989 | 1,212
Collateralized Mortgage Backed Securities [Member] |  |
Securities held-to-maturity, amortized cost | 7,929 | 7,934
Securities held-to-maturity, fair value | 8,953 | 8,114
Securities held-to-maturity, gross unrealized gains | 1,024 | 180
Securities held-to-maturity, gross unrealized losses | 0 |
Securities available for sale, amortized cost, total other securities | 479,078 | 521,600
Securities available for sale, fair value | 489,556 | 523,849
Securities available for sale, gross unrealized gains | 10,892 | 4,188
Securities available for sale, gross unrealized losses | 414 | 1,939
Other Securities [Member] |  |
Securities available for sale, amortized cost, total other securities | 1,355 | 1,332
Securities available for sale, fair value | 1,355 | 1,332
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 | 256,935 | 256,694
Securities available for sale, fair value | 225,856 | 248,651
Securities available for sale, gross unrealized gains | 58 | 119
Securities available for sale, gross unrealized losses | 31,137 | 8,162
REMIC and CMO [Member] |  |
Securities available for sale, amortized cost, total other securities | 341,170 | 348,236
Securities available for sale, fair value | 348,109 | 348,989
Securities available for sale, gross unrealized gains | 7,329 | 2,193
Securities available for sale, gross unrealized losses | 390 | 1,440
GNMA [Member] |  |
Securities available for sale, amortized cost, total other securities | 602 | 653
Securities available for sale, fair value | 659 | 704
Securities available for sale, gross unrealized gains | 57 | 51
Securities available for sale, gross unrealized losses | 0 | 0
FHLMC [Member] |  |
Securities available for sale, amortized cost, total other securities | 37,630 | 68,476
Securities available for sale, fair value | 38,564 | 69,274
Securities available for sale, gross unrealized gains | 934 | 871
Securities available for sale, gross unrealized losses | $ 0 | $ 73

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