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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, 2020 | Dec. 31, 2019
--- | --- | ---
Amortized Cost |  |
Due in one year or less | $ 1,945 | $ 1,134
Due after one through five years | 4,800 | 5,031
Due after five through ten years | 47,807 | 74,745
Due after ten years | 857,464 | 817,161
Total debt securities with a single maturity date | 912,016 | 898,071
Total Investment Securities | 1,732,279 | 1,740,420
Fair Value |  |
Due in one year or less | 1,965 | 1,136
Due after one through five years | 4,932 | 5,141
Due after five through ten years | 49,833 | 76,920
Due after ten years | 905,587 | 855,505
Total debt securities with a single maturity date | 962,317 | 938,702
Total Investment Securities | 1,815,775 | 1,790,025
Amortized Cost |  |
Due in one year or less | 8,740 | 9,920
Due after one through five years | 33,393 | 45,197
Due after five through ten years | 107,482 | 84,153
Due after ten years | 245,414 | 231,964
Total debt securities with a single maturity date | 395,029 | 371,234
Total Investment Securities | 882,179 | 806,038
Fair Value |  |
Due in one year or less | 8,762 | 10,105
Due after one through five years | 33,947 | 45,654
Due after five through ten years | 111,986 | 88,844
Due after ten years | 258,344 | 241,639
Total debt securities with a single maturity date | 413,039 | 386,242
Investment securities held to maturity | 920,178 | 827,566
U.S. Government-sponsored mortgage-backed securities |  |
Amortized Cost |  |
Without single maturity date | 820,263 | 842,349
Total Investment Securities | 820,263 | 842,349
Fair Value |  |
Without single maturity date | 853,458 | 851,323
Total Investment Securities | 853,458 | 851,323
Amortized Cost |  |
Without single maturity date | 487,150 | 434,804
Total Investment Securities | 487,150 | 434,804
Fair Value |  |
Without single maturity date | 507,139 | 441,324
Investment securities held to maturity | $ 507,139 | $ 441,324

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