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v3.22.1

Investment Securities - Schedule of Amortized Cost, Gross Unrealized Gains and Losses, and Fair Value of Investment Securities (Details) - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021
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Available-for-Sale: |  |
Available-for-Sale: Amortized Cost | $ 4,548,509 | $ 4,320,884
Available-for-Sale: Gross Unrealized Gains | 2,559 | 21,460
Available-for-Sale: Gross Unrealized Losses | (292,534) | (66,288)
Available-for-Sale: Fair Value | 4,258,534 | 4,276,056
Held-to-Maturity: |  |
Held-to-Maturity: Amortized Cost | 4,489,615 | 4,694,780
Held-to-Maturity: Gross Unrealized Gains | 3,806 | 28,334
Held-to-Maturity: Gross Unrealized Losses | (322,159) | (76,495)
Held-to-Maturity: Fair Value | 4,171,262 | 4,646,619
Debt Securities Issued by the U.S. Treasury and Government Agencies |  |
Available-for-Sale: |  |
Available-for-Sale: Amortized Cost | 281,530 | 248,858
Available-for-Sale: Gross Unrealized Gains | 1,326 | 1,513
Available-for-Sale: Gross Unrealized Losses | (7,693) | (284)
Available-for-Sale: Fair Value | 275,163 | 250,087
Held-to-Maturity: |  |
Held-to-Maturity: Amortized Cost | 131,526 | 131,495
Held-to-Maturity: Gross Unrealized Gains |  | 287
Held-to-Maturity: Gross Unrealized Losses | (8,584) | (643)
Held-to-Maturity: Fair Value | 122,942 | 131,139
Debt Securities Issued by States and Political Subdivisions |  |
Available-for-Sale: |  |
Available-for-Sale: Amortized Cost | 74,724 | 74,743
Available-for-Sale: Gross Unrealized Gains | 6 | 1,080
Available-for-Sale: Gross Unrealized Losses | (5,062) | (5)
Available-for-Sale: Fair Value | 69,668 | 75,818
Debt Securities Issued by Government-Sponsored Enterprises |  |
Available-for-Sale: |  |
Available-for-Sale: Amortized Cost | 1,758 | 1,758
Available-for-Sale: Gross Unrealized Gains |  | 33
Available-for-Sale: Gross Unrealized Losses | (57) | (11)
Available-for-Sale: Fair Value | 1,701 | 1,780
Debt Securities Issued by Corporations |  |
Available-for-Sale: |  |
Available-for-Sale: Amortized Cost | 433,216 | 384,590
Available-for-Sale: Gross Unrealized Gains | 12 | 2,339
Available-for-Sale: Gross Unrealized Losses | (23,622) | (3,816)
Available-for-Sale: Fair Value | 409,606 | 383,113
Held-to-Maturity: |  |
Held-to-Maturity: Amortized Cost | 19,496 | 20,316
Held-to-Maturity: Gross Unrealized Gains |  | 76
Held-to-Maturity: Gross Unrealized Losses | (1,175) | (249)
Held-to-Maturity: Fair Value | 18,321 | 20,143
Residential - Government Agencies |  |
Available-for-Sale: |  |
Available-for-Sale: Amortized Cost | 1,368,122 | 1,327,990
Available-for-Sale: Gross Unrealized Gains | 1,063 | 9,818
Available-for-Sale: Gross Unrealized Losses | (78,035) | (18,766)
Available-for-Sale: Fair Value | 1,291,150 | 1,319,042
Held-to-Maturity: |  |
Held-to-Maturity: Amortized Cost | 1,681,326 | 1,774,394
Held-to-Maturity: Gross Unrealized Gains | 3,259 | 12,139
Held-to-Maturity: Gross Unrealized Losses | (118,611) | (30,621)
Held-to-Maturity: Fair Value | 1,565,974 | 1,755,912
Residential - U.S. Government-Sponsored Enterprises |  |
Available-for-Sale: |  |
Available-for-Sale: Amortized Cost | 2,201,086 | 2,127,781
Available-for-Sale: Gross Unrealized Gains | 128 | 4,792
Available-for-Sale: Gross Unrealized Losses | (170,933) | (42,247)
Available-for-Sale: Fair Value | 2,030,281 | 2,090,326
Held-to-Maturity: |  |
Held-to-Maturity: Amortized Cost | 2,189,122 | 2,286,880
Held-to-Maturity: Gross Unrealized Gains | 547 | 15,508
Held-to-Maturity: Gross Unrealized Losses | (152,862) | (32,627)
Held-to-Maturity: Fair Value | 2,036,807 | 2,269,761
Commercial - Government Agencies or Sponsored Agencies |  |
Available-for-Sale: |  |
Available-for-Sale: Amortized Cost | 188,073 | 155,164
Available-for-Sale: Gross Unrealized Gains | 24 | 1,885
Available-for-Sale: Gross Unrealized Losses | (7,132) | (1,159)
Available-for-Sale: Fair Value | 180,965 | 155,890
Held-to-Maturity: |  |
Held-to-Maturity: Amortized Cost | 468,145 | 481,695
Held-to-Maturity: Gross Unrealized Gains |  | 324
Held-to-Maturity: Gross Unrealized Losses | (40,927) | (12,355)
Held-to-Maturity: Fair Value | 427,218 | 469,664
Mortgage-Backed Securities |  |
Available-for-Sale: |  |
Available-for-Sale: Amortized Cost | 3,757,281 | 3,610,935
Available-for-Sale: Gross Unrealized Gains | 1,215 | 16,495
Available-for-Sale: Gross Unrealized Losses | (256,100) | (62,172)
Available-for-Sale: Fair Value | 3,502,396 | 3,565,258
Held-to-Maturity: |  |
Held-to-Maturity: Amortized Cost | 4,338,593 | 4,542,969
Held-to-Maturity: Gross Unrealized Gains | 3,806 | 27,971
Held-to-Maturity: Gross Unrealized Losses | (312,400) | (75,603)
Held-to-Maturity: Fair Value | $ 4,029,999 | $ 4,495,337

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