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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, 2020 | Dec. 31, 2019
--- | --- | ---
Amortized Cost |  |
Due in one year or less | $ 1,947 | $ 1,134
Due after one through five years | 4,589 | 5,031
Due after five through ten years | 49,425 | 74,745
Due after ten years | 976,970 | 817,161
Total debt securities with a single maturity date | 1,032,931 | 898,071
Total Investment Securities | 1,794,322 | 1,740,420
Fair Value |  |
Due in one year or less | 1,961 | 1,136
Due after one through five years | 4,718 | 5,141
Due after five through ten years | 52,485 | 76,920
Due after ten years | 1,041,195 | 855,505
Total debt securities with a single maturity date | 1,100,359 | 938,702
Total Investment Securities | 1,890,593 | 1,790,025
Amortized Cost |  |
Due in one year or less | 12,191 | 9,920
Due after one through five years | 23,639 | 45,197
Due after five through ten years | 95,694 | 84,153
Due after ten years | 254,290 | 231,964
Total debt securities with a single maturity date | 385,814 | 371,234
Total Investment Securities | 898,786 | 806,038
Fair Value |  |
Due in one year or less | 12,217 | 10,105
Due after one through five years | 24,224 | 45,654
Due after five through ten years | 101,354 | 88,844
Due after ten years | 271,758 | 241,639
Total debt securities with a single maturity date | 409,553 | 386,242
Investment securities held to maturity | 941,426 | 827,566
U.S. Government-sponsored mortgage-backed securities |  |
Amortized Cost |  |
Without single maturity date | 761,391 | 842,349
Total Investment Securities | 761,391 | 842,349
Fair Value |  |
Without single maturity date | 790,234 | 851,323
Total Investment Securities | 790,234 | 851,323
Amortized Cost |  |
Without single maturity date | 512,972 | 434,804
Total Investment Securities | 512,972 | 434,804
Fair Value |  |
Without single maturity date | 531,873 | 441,324
Investment securities held to maturity | $ 531,873 | $ 441,324

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