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Investment Securities - Schedule of Amortized Cost, Gross Unrealized Gains and Losses, and Fair Value of Investment Securities (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
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Available-for-Sale: |  |
Available-for-Sale: Amortized Cost | $ 4,362,585 | $ 3,721,636
Available-for-Sale: Gross Unrealized Gains | 33,784 | 72,428
Available-for-Sale: Gross Unrealized Losses | (42,849) | (2,375)
Available-for-Sale: Fair Value | 4,353,520 | 3,791,689
Held-to-Maturity: |  |
Held-to-Maturity: Amortized Cost | 4,899,880 | 3,262,727
Held-to-Maturity: Gross Unrealized Gains | 42,808 | 86,494
Held-to-Maturity: Gross Unrealized Losses | (46,925) | (528)
Held-to-Maturity: Fair Value | 4,895,763 | 3,348,693
Debt Securities Issued by the U.S. Treasury and Government Agencies |  |
Available-for-Sale: |  |
Available-for-Sale: Amortized Cost | 143,409 | 174,409
Available-for-Sale: Gross Unrealized Gains | 1,561 | 427
Available-for-Sale: Gross Unrealized Losses | (106) | (591)
Available-for-Sale: Fair Value | 144,864 | 174,245
Held-to-Maturity: |  |
Held-to-Maturity: Amortized Cost | 131,465 | 7,500
Held-to-Maturity: Gross Unrealized Gains | 277 | 8
Held-to-Maturity: Gross Unrealized Losses | (184) | (8)
Held-to-Maturity: Fair Value | 131,558 | 7,500
Debt Securities Issued by States and Political Subdivisions |  |
Available-for-Sale: |  |
Available-for-Sale: Amortized Cost | 20,231 | 23,540
Available-for-Sale: Gross Unrealized Gains | 839 | 1,301
Available-for-Sale: Gross Unrealized Losses | (2) | (1)
Available-for-Sale: Fair Value | 21,068 | 24,840
Held-to-Maturity: |  |
Held-to-Maturity: Amortized Cost | 33,254 | 33,763
Held-to-Maturity: Gross Unrealized Gains | 125 | 741
Held-to-Maturity: Fair Value | 33,379 | 34,504
Debt Securities Issued by Government-Sponsored Enterprises |  |
Available-for-Sale: |  |
Available-for-Sale: Amortized Cost | 1,509 | 985
Available-for-Sale: Gross Unrealized Gains | 47 | 77
Available-for-Sale: Gross Unrealized Losses | (1) | 0
Available-for-Sale: Fair Value | 1,555 | 1,062
Debt Securities Issued by Corporations |  |
Available-for-Sale: |  |
Available-for-Sale: Amortized Cost | 385,787 | 220,717
Available-for-Sale: Gross Unrealized Gains | 3,630 | 4,844
Available-for-Sale: Gross Unrealized Losses | (1,543) | (956)
Available-for-Sale: Fair Value | 387,874 | 224,605
Held-to-Maturity: |  |
Held-to-Maturity: Amortized Cost | 21,133 | 12,031
Held-to-Maturity: Gross Unrealized Gains | 140 | 251
Held-to-Maturity: Gross Unrealized Losses | (271) |
Held-to-Maturity: Fair Value | 21,002 | 12,282
Residential - Government Agencies |  |
Available-for-Sale: |  |
Available-for-Sale: Amortized Cost | 1,410,231 | 1,561,603
Available-for-Sale: Gross Unrealized Gains | 15,435 | 33,657
Available-for-Sale: Gross Unrealized Losses | (8,483) | (445)
Available-for-Sale: Fair Value | 1,417,183 | 1,594,815
Held-to-Maturity: |  |
Held-to-Maturity: Amortized Cost | 1,877,804 | 917,459
Held-to-Maturity: Gross Unrealized Gains | 18,683 | 30,580
Held-to-Maturity: Gross Unrealized Losses | (14,525) | (29)
Held-to-Maturity: Fair Value | 1,881,962 | 948,010
Residential - U.S. Government-Sponsored Enterprises |  |
Available-for-Sale: |  |
Available-for-Sale: Amortized Cost | 2,223,697 | 1,497,353
Available-for-Sale: Gross Unrealized Gains | 8,395 | 21,254
Available-for-Sale: Gross Unrealized Losses | (32,040) | (324)
Available-for-Sale: Fair Value | 2,200,052 | 1,518,283
Held-to-Maturity: |  |
Held-to-Maturity: Amortized Cost | 2,371,155 | 2,099,053
Held-to-Maturity: Gross Unrealized Gains | 22,683 | 51,735
Held-to-Maturity: Gross Unrealized Losses | (24,397) | (291)
Held-to-Maturity: Fair Value | 2,369,441 | 2,150,497
Commercial - Government Agencies |  |
Available-for-Sale: |  |
Available-for-Sale: Amortized Cost | 177,721 | 243,029
Available-for-Sale: Gross Unrealized Gains | 3,877 | 10,868
Available-for-Sale: Gross Unrealized Losses | (674) | (58)
Available-for-Sale: Fair Value | 180,924 | 253,839
Held-to-Maturity: |  |
Held-to-Maturity: Amortized Cost | 465,069 | 192,921
Held-to-Maturity: Gross Unrealized Gains | 900 | 3,179
Held-to-Maturity: Gross Unrealized Losses | (7,548) | (200)
Held-to-Maturity: Fair Value | 458,421 | 195,900
Mortgage-Backed Securities |  |
Available-for-Sale: |  |
Available-for-Sale: Amortized Cost | 3,811,649 | 3,301,985
Available-for-Sale: Gross Unrealized Gains | 27,707 | 65,779
Available-for-Sale: Gross Unrealized Losses | (41,197) | (827)
Available-for-Sale: Fair Value | 3,798,159 | 3,366,937
Held-to-Maturity: |  |
Held-to-Maturity: Amortized Cost | 4,714,028 | 3,209,433
Held-to-Maturity: Gross Unrealized Gains | 42,266 | 85,494
Held-to-Maturity: Gross Unrealized Losses | (46,470) | (520)
Held-to-Maturity: Fair Value | $ 4,709,824 | $ 3,294,407

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