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Securities - Securities Available-for-sale and Held-to-maturity by Contractual Maturity (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
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Securities held-to-maturity, amortized cost, due after ten years | $ 50,654 |
Securities held-to-maturity, fair value, due after ten years | 53,268 |
Securities held-to-maturity, amortized cost | 58,573 | $ 58,888
Securities held-to-maturity, fair value | 62,466 | 62,112
Securities available for sale, amortized cost, due after one years through five years | 45,000 |
Securities available for sale, fair value, due after one years through five years | 43,654 |
Securities available for sale, amortized cost, due after five years through ten years | 110,431 |
Securities available for sale, fair value, due after five years through ten years | 104,599 |
Securities available for sale, amortized cost, due after ten years | 76,256 |
Securities available for sale, fair value, due after ten years | 73,777 |
Securities available for sale, amortized cost, total other securities | 620,262 | 778,294
Securities available for sale, fair value, total other securities | 620,956 | 772,500
Other Debt Obligations [Member] |  |
Securities held-to-maturity, amortized cost | 50,654 | 50,954
Securities held-to-maturity, fair value | 53,268 | 53,998
Securities available for sale, fair value, total other securities | 234,721 | 248,651
Total Other Securities [Member] |  |
Securities available for sale, amortized cost, total other securities | 231,687 |
Securities available for sale, fair value, total other securities | 222,030 |
Collateralized Mortgage Backed Securities [Member] |  |
Securities held-to-maturity, amortized cost | 7,919 | 7,934
Securities held-to-maturity, fair value | 9,198 | 8,114
Securities available for sale, amortized cost, total other securities | 375,884 | 521,600
Securities available for sale, fair value, total other securities | 386,235 | 523,849
Mutual Fund Debt Securities [Member] |  |
Securities available for sale, amortized cost, total other securities | 12,691 | 12,216
Securities available for sale, fair value, total other securities | $ 12,691 | $ 12,216

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