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v3.23.3

Investment Securities - Schedule of Amortized Cost, Gross Unrealized Gains and Losses, and Fair Value of Investment Securities (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Available-for-Sale: |  |
Available-for-Sale: Amortized Cost | $ 2,752,093 | $ 3,172,436
Available-for-Sale: Gross Unrealized Gains | 516 | 1,851
Available-for-Sale: Gross Unrealized Losses | (365,285) | (329,464)
Available-for-Sale: Fair Value | 2,387,324 | 2,844,823
Held-to-Maturity: |  |
Held-to-Maturity: Amortized Cost | 5,088,013 | 5,414,139
Held-to-Maturity: Gross Unrealized Gains | 5 | 43
Held-to-Maturity: Gross Unrealized Losses | (983,549) | (798,789)
Held-to-Maturity: Fair Value | 4,104,469 | 4,615,393
Debt Securities Issued by the U.S. Treasury and Government Agencies |  |
Available-for-Sale: |  |
Available-for-Sale: Amortized Cost | 228,181 | 248,335
Available-for-Sale: Gross Unrealized Gains | 408 | 638
Available-for-Sale: Gross Unrealized Losses | (15,133) | (15,067)
Available-for-Sale: Fair Value | 213,456 | 233,906
Held-to-Maturity: |  |
Held-to-Maturity: Amortized Cost | 131,710 | 131,619
Held-to-Maturity: Gross Unrealized Losses | (20,301) | (18,202)
Held-to-Maturity: Fair Value | 111,409 | 113,417
Debt Securities Issued by States and Political Subdivisions |  |
Available-for-Sale: |  |
Available-for-Sale: Amortized Cost | 73,722 | 107,689
Available-for-Sale: Gross Unrealized Gains |  | 158
Available-for-Sale: Gross Unrealized Losses | (13,120) | (12,582)
Available-for-Sale: Fair Value | 60,602 | 95,265
Debt Securities Issued by Government-Sponsored Enterprises |  |
Available-for-Sale: |  |
Available-for-Sale: Amortized Cost | 1,757 | 48,807
Available-for-Sale: Gross Unrealized Losses | (117) | (179)
Available-for-Sale: Fair Value | 1,640 | 48,628
Debt Securities Issued by Corporations |  |
Available-for-Sale: |  |
Available-for-Sale: Amortized Cost | 706,693 | 850,585
Available-for-Sale: Gross Unrealized Gains | 7 | 809
Available-for-Sale: Gross Unrealized Losses | (57,560) | (56,736)
Available-for-Sale: Fair Value | 649,140 | 794,658
Held-to-Maturity: |  |
Held-to-Maturity: Amortized Cost | 11,788 | 17,014
Held-to-Maturity: Gross Unrealized Losses | (2,582) | (2,534)
Held-to-Maturity: Fair Value | 9,206 | 14,480
Residential - Government Agencies |  |
Available-for-Sale: |  |
Available-for-Sale: Amortized Cost | 740,652 | 828,798
Available-for-Sale: Gross Unrealized Gains | 101 | 245
Available-for-Sale: Gross Unrealized Losses | (108,806) | (96,215)
Available-for-Sale: Fair Value | 631,947 | 732,828
Held-to-Maturity: |  |
Held-to-Maturity: Amortized Cost | 1,712,317 | 1,848,239
Held-to-Maturity: Gross Unrealized Gains |  | 35
Held-to-Maturity: Gross Unrealized Losses | (330,120) | (294,047)
Held-to-Maturity: Fair Value | 1,382,197 | 1,554,227
Residential - U.S. Government-Sponsored Enterprises |  |
Available-for-Sale: |  |
Available-for-Sale: Amortized Cost | 841,441 | 919,980
Available-for-Sale: Gross Unrealized Gains |  | 1
Available-for-Sale: Gross Unrealized Losses | (142,092) | (126,110)
Available-for-Sale: Fair Value | 699,349 | 793,871
Held-to-Maturity: |  |
Held-to-Maturity: Amortized Cost | 2,794,307 | 2,968,322
Held-to-Maturity: Gross Unrealized Gains | 5 | 8
Held-to-Maturity: Gross Unrealized Losses | (519,138) | (397,055)
Held-to-Maturity: Fair Value | 2,275,174 | 2,571,275
Commercial - Government Agencies or Sponsored Agencies |  |
Available-for-Sale: |  |
Available-for-Sale: Amortized Cost | 159,647 | 168,242
Available-for-Sale: Gross Unrealized Losses | (28,457) | (22,575)
Available-for-Sale: Fair Value | 131,190 | 145,667
Held-to-Maturity: |  |
Held-to-Maturity: Amortized Cost | 437,891 | 448,945
Held-to-Maturity: Gross Unrealized Losses | (111,408) | (86,951)
Held-to-Maturity: Fair Value | 326,483 | 361,994
Mortgage-Backed Securities |  |
Available-for-Sale: |  |
Available-for-Sale: Amortized Cost | 1,741,740 | 1,917,020
Available-for-Sale: Gross Unrealized Gains | 101 | 246
Available-for-Sale: Gross Unrealized Losses | (279,355) | (244,900)
Available-for-Sale: Fair Value | 1,462,486 | 1,672,366
Held-to-Maturity: |  |
Held-to-Maturity: Amortized Cost | 4,944,515 | 5,265,506
Held-to-Maturity: Gross Unrealized Gains | 5 | 43
Held-to-Maturity: Gross Unrealized Losses | (960,666) | (778,053)
Held-to-Maturity: Fair Value | $ 3,983,854 | $ 4,487,496

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