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Investment Securities - Amortized Cost and Fair Value of Available for Sale Securities and Held to Maturity Securities by Contractual Maturity (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Available for Sale, Amortized Cost |  |
Due in one year or less | $ 13,092 |
Due after one through five years | 5,311 |
Due after five through ten years | 73,280 |
Due after ten years | 527,835 |
Amortized Cost | 619,518 |
Total Investment Securities | 1,149,727 | $ 986,565
Available for Sale, Fair Value |  |
Due in one year or less | 13,144 |
Due after one through five years | 5,378 |
Due after five through ten years | 74,411 |
Due after ten years | 526,815 |
Fair Value | 619,748 |
Total Investment Securities | 1,142,195 | 999,947
Held to Maturity, Amortized Cost |  |
Due in one year or less | 4,732 |
Due after one through five years | 49,054 |
Due after five through ten years | 62,873 |
Due after ten years | 104,868 |
Amortized Cost | 221,527 |
Amortized Cost | 490,387 | 560,655
Held to Maturity, Fair Value |  |
Due in one year or less | 4,730 |
Due after one through five years | 48,473 |
Due after five through ten years | 64,163 |
Due after ten years | 105,601 |
Fair Value | 222,967 |
Total Investment Securities | 489,217 | $ 568,208
U.S. Government-sponsored mortgage-backed securities |  |
Available for Sale, Amortized Cost |  |
Without single maturity date | 530,209 |
Available for Sale, Fair Value |  |
Without single maturity date | 522,447 |
Held to Maturity, Amortized Cost |  |
Without single maturity date | 268,860 |
Held to Maturity, Fair Value |  |
Without single maturity date | $ 266,250 |

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- Definition Carrying amount of debt securities accounted for as held-to-maturity, net of adjustments including, but not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized and fair value hedge accounting adjustments, maturing in the next rolling twelve months following the latest balance sheet presented. + References No definition available. + Details
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