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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, 2020 | Dec. 31, 2019
--- | --- | ---
Available for Sale, Amortized Cost |  |
Due in one year or less | $ 1,349 | $ 1,134
Due after one through five years | 5,545 | 5,031
Due after five through ten years | 70,777 | 74,745
Due after ten years | 1,097,451 | 817,161
Amortized Cost | 1,175,122 | 898,071
Amortized Cost | 1,807,389 | 1,740,420
Available for Sale, Fair Value |  |
Due in one year or less | 1,353 | 1,136
Due after one through five years | 5,764 | 5,141
Due after five through ten years | 75,223 | 76,920
Due after ten years | 1,182,110 | 855,505
Fair Value | 1,264,450 | 938,702
Total Investment Securities | 1,919,119 | 1,790,025
Held to Maturity, Amortized Cost |  |
Due in one year or less | 9,712 | 9,920
Due after one through five years | 22,241 | 45,197
Due after five through ten years | 115,408 | 84,153
Due after ten years | 505,153 | 231,964
Amortized Cost | 652,514 | 371,234
Amortized Cost | 1,227,668 | 806,038
Held to Maturity, Fair Value |  |
Due in one year or less | 9,755 | 10,105
Due after one through five years | 23,190 | 45,654
Due after five through ten years | 121,333 | 88,844
Due after ten years | 533,079 | 241,639
Fair Value | 687,357 | 386,242
Total Investment Securities | 1,280,293 | 827,566
U.S. Government-sponsored mortgage-backed securities |  |
Available for Sale, Amortized Cost |  |
U.S. Government-sponsored mortgage-backed securities | 632,267 | 842,349
Amortized Cost | 632,267 | 842,349
Available for Sale, Fair Value |  |
Without single maturity date | 654,669 | 851,323
Total Investment Securities | 654,669 | 851,323
Held to Maturity, Amortized Cost |  |
Without single maturity date | 575,154 | 434,804
Amortized Cost | 575,154 | 434,804
Held to Maturity, Fair Value |  |
Without single maturity date | 592,936 | 441,324
Total Investment Securities | $ 592,936 | $ 441,324

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