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Securities - Securities Available-for-sale and Held-to-maturity by Contractual Maturity (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019
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Securities held-to-maturity, amortized cost, due after ten years | $ 50,627 |
Securities held-to-maturity, fair value, due after ten years | 51,938 |
Securities held-to-maturity, amortized cost | 58,556 | $ 58,888
Securities held-to-maturity, fair value | 60,891 | 62,112
Securities available for sale, amortized cost, due after one years through five years | 20,000 |
Securities available for sale, fair value, due after one years through five years | 18,276 |
Securities available for sale, amortized cost, due after five years through ten years | 127,923 |
Securities available for sale, fair value, due after five years through ten years | 109,510 |
Securities available for sale, amortized cost, due after ten years | 96,536 |
Securities available for sale, fair value, due after ten years | 85,594 |
Securities available for sale, amortized cost, total other securities | 736,013 | 778,294
Securities available for sale, fair value, total other securities | 715,412 | 772,500
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 available for sale, fair value, total other securities | 225,856 | 248,651
Total Other Securities [Member] |  |
Securities available for sale, amortized cost, total other securities | 244,459 |
Securities available for sale, fair value, total other securities | 213,380 |
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 available for sale, amortized cost, total other securities | 479,078 | 521,600
Securities available for sale, fair value, total other securities | 489,556 | 523,849
Mutual Fund Debt Securities [Member] |  |
Securities available for sale, amortized cost, total other securities | 12,476 | 12,216
Securities available for sale, fair value, total other securities | $ 12,476 | $ 12,216

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