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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 | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Amortized Cost |  |
Due in one year or less | $ 4,746 | $ 13,092
Due after one through five years | 3,750 | 5,311
Due after five through ten years | 79,533 | 73,280
Due after ten years | 579,113 | 527,835
Total debt securities with a single maturity date | 667,142 | 619,518
Total Investment Securities | 1,229,729 | 1,149,727
Fair Value |  |
Due in one year or less | 4,764 | 13,144
Due after one through five years | 3,835 | 5,378
Due after five through ten years | 81,458 | 74,411
Due after ten years | 595,535 | 526,815
Total debt securities with a single maturity date | 685,592 | 619,748
Total Investment Securities | 1,247,632 | 1,142,195
Amortized Cost |  |
Due in one year or less | 3,502 | 4,732
Due after one through five years | 49,060 | 49,054
Due after five through ten years | 65,990 | 62,873
Due after ten years | 159,587 | 104,868
Total debt securities with a single maturity date | 278,139 | 221,527
Total Investment Securities | 615,027 | 490,387
Fair Value |  |
Due in one year or less | 3,501 | 4,730
Due after one through five years | 48,717 | 48,473
Due after five through ten years | 68,332 | 64,163
Due after ten years | 163,804 | 105,601
Total debt securities with a single maturity date | 284,354 | 222,967
Investment securities held to maturity | 622,635 | 489,217
U.S. Government-sponsored mortgage-backed securities |  |
Amortized Cost |  |
Without single maturity date | 562,587 | 530,209
Fair Value |  |
Without single maturity date | 562,040 | 522,447
Amortized Cost |  |
Without single maturity date | 336,888 | 268,860
Fair Value |  |
Without single maturity date | $ 338,281 | $ 266,250

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