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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 | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Amortized Cost |  |
Due in one year or less | $ 2,421 | $ 1,349
Due after one through five years | 13,087 | 5,545
Due after five through ten years | 100,122 | 70,777
Due after ten years | 1,367,250 | 1,097,451
Total debt securities with a single maturity date | 1,482,880 | 1,175,122
Total investment securities | 2,307,977 | 1,807,389
Fair Value |  |
Due in one year or less | 2,428 | 1,353
Due after one through five years | 14,068 | 5,764
Due after five through ten years | 105,457 | 75,223
Due after ten years | 1,429,488 | 1,182,110
Total debt securities with a single maturity date | 1,551,441 | 1,264,450
Total investment securities | 2,374,578 | 1,919,119
Amortized Cost |  |
Due in one year or less | 8,718 | 9,712
Due after one through five years | 28,789 | 22,241
Due after five through ten years | 176,603 | 115,408
Due after ten years | 874,315 | 505,153
Total debt securities with a single maturity date | 1,088,425 | 652,514
Amortized Cost | 2,071,183 | 1,227,668
Fair Value |  |
Due in one year or less | 8,766 | 9,755
Due after one through five years | 30,589 | 23,190
Due after five through ten years | 180,790 | 121,333
Due after ten years | 882,238 | 533,079
Total debt securities with a single maturity date | 1,102,383 | 687,357
Investment securities held to maturity | 2,086,555 | 1,280,293
U.S. Government-sponsored mortgage-backed securities |  |
Amortized Cost |  |
Without single maturity date | 825,097 | 632,267
Fair Value |  |
Without single maturity date | 823,137 | 654,669
Total investment securities | 823,137 | 654,669
Amortized Cost |  |
Without single maturity date | 982,758 | 575,154
Amortized Cost | 982,758 | 575,154
Fair Value |  |
Without single maturity date | 984,172 | 592,936
Investment securities held to maturity | $ 984,172 | $ 592,936

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