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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 | Jun. 30, 2019 | Dec. 31, 2018
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Amortized Cost |  |
Due in one year or less | $ 1,131 | $ 13,092
Due after one through five years | 3,752 | 5,311
Due after five through ten years | 74,311 | 73,280
Due after ten years | 639,454 | 527,835
Total debt securities with a single maturity date | 718,648 | 619,518
Total Investment Securities | 1,360,946 | 1,149,727
Fair Value |  |
Due in one year or less | 1,138 | 13,144
Due after one through five years | 3,851 | 5,378
Due after five through ten years | 76,604 | 74,411
Due after ten years | 668,143 | 526,815
Total debt securities with a single maturity date | 749,736 | 619,748
Total Investment Securities | 1,399,959 | 1,142,195
Amortized Cost |  |
Due in one year or less | 3,784 | 4,732
Due after one through five years | 46,941 | 49,054
Due after five through ten years | 78,716 | 62,873
Due after ten years | 216,000 | 104,868
Total debt securities with a single maturity date | 345,441 | 221,527
Total Investment Securities | 692,965 | 490,387
Fair Value |  |
Due in one year or less | 3,782 | 4,730
Due after one through five years | 46,914 | 48,473
Due after five through ten years | 81,769 | 64,163
Due after ten years | 223,895 | 105,601
Total debt securities with a single maturity date | 356,360 | 222,967
Investment securities held to maturity | 708,915 | 489,217
U.S. Government-sponsored mortgage-backed securities |  |
Amortized Cost |  |
Without single maturity date | 642,298 | 530,209
Fair Value |  |
Without single maturity date | 650,223 | 522,447
Amortized Cost |  |
Without single maturity date | 347,524 | 268,860
Fair Value |  |
Without single maturity date | $ 352,555 | $ 266,250

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