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Securities - Securities Available-for-sale and Held-to-maturity by Contractual Maturity (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
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Securities held-to-maturity, amortized cost, due in one year or less | $ 180 |
Securities held-to-maturity, fair value, due in one year or less | 180 |
Securities held-to-maturity, amortized cost, due after ten years | 50,774 |
Securities held-to-maturity, fair value, due after ten years | 53,818 |
Securities held-to-maturity, amortized cost | 58,888 | $ 32,018
Securities held-to-maturity, fair value | 62,112 | 29,874
Securities available for sale, amortized cost, due after one years through five years | 10,000 |
Securities available for sale, fair value, due after one years through five years | 9,820 |
Securities available for sale, amortized cost, due after five years through ten years | 137,918 |
Securities available for sale, fair value, due after five years through ten years | 131,051 |
Securities available for sale, amortized cost, due after ten years | 96,560 |
Securities available for sale, fair value, due after ten years | 95,564 |
Securities available for sale, amortized cost, total other securities | 778,294 | 845,332
Securities available for sale, fair value, total other securities | 772,500 | 822,655
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 available for sale, fair value, total other securities | 248,651 | 264,702
Total Other Securities [Member] |  |
Securities available for sale, amortized cost, total other securities | 244,478 |
Securities available for sale, fair value, total other securities | 236,435 |
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 available for sale, amortized cost, total other securities | 521,600 | 567,863
Securities available for sale, fair value, total other securities | 523,849 | 557,953
Mutual Fund Debt Securities [Member] |  |
Securities available for sale, amortized cost, total other securities | 12,216 | 11,586
Securities available for sale, fair value, total other securities | $ 12,216 | $ 11,586

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