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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 | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Available-for-Sale: |  |
Available-for-Sale: Amortized Cost | $ 2,694,012 | $ 3,172,436
Available-for-Sale: Gross Unrealized Gains | 704 | 1,851
Available-for-Sale: Gross Unrealized Losses | (285,783) | (329,464)
Available-for-Sale: Fair Value | 2,408,933 | 2,844,823
Held-to-Maturity: |  |
Held-to-Maturity: Amortized Cost | 4,997,335 | 5,414,139
Held-to-Maturity: Gross Unrealized Gains | 29 | 43
Held-to-Maturity: Gross Unrealized Losses | (743,727) | (798,789)
Held-to-Maturity: Fair Value | 4,253,637 | 4,615,393
Debt Securities Issued by the U.S. Treasury and Government Agencies |  |
Available-for-Sale: |  |
Available-for-Sale: Amortized Cost | 223,308 | 248,335
Available-for-Sale: Gross Unrealized Gains | 361 | 638
Available-for-Sale: Gross Unrealized Losses | (11,096) | (15,067)
Available-for-Sale: Fair Value | 212,573 | 233,906
Held-to-Maturity: |  |
Held-to-Maturity: Amortized Cost | 131,742 | 131,619
Held-to-Maturity: Gross Unrealized Losses | (15,211) | (18,202)
Held-to-Maturity: Fair Value | 116,531 | 113,417
Debt Securities Issued by States and Political Subdivisions |  |
Available-for-Sale: |  |
Available-for-Sale: Amortized Cost | 73,417 | 107,689
Available-for-Sale: Gross Unrealized Gains |  | 158
Available-for-Sale: Gross Unrealized Losses | (9,611) | (12,582)
Available-for-Sale: Fair Value | 63,806 | 95,265
Debt Securities Issued by Government-Sponsored Enterprises |  |
Available-for-Sale: |  |
Available-for-Sale: Amortized Cost | 1,556 | 48,807
Available-for-Sale: Gross Unrealized Losses | (80) | (179)
Available-for-Sale: Fair Value | 1,476 | 48,628
Debt Securities Issued by Corporations |  |
Available-for-Sale: |  |
Available-for-Sale: Amortized Cost | 706,002 | 850,585
Available-for-Sale: Gross Unrealized Gains | 142 | 809
Available-for-Sale: Gross Unrealized Losses | (48,443) | (56,736)
Available-for-Sale: Fair Value | 657,701 | 794,658
Held-to-Maturity: |  |
Held-to-Maturity: Amortized Cost | 11,483 | 17,014
Held-to-Maturity: Gross Unrealized Losses | (1,998) | (2,534)
Held-to-Maturity: Fair Value | 9,485 | 14,480
Residential - Government Agencies |  |
Available-for-Sale: |  |
Available-for-Sale: Amortized Cost | 713,918 | 828,798
Available-for-Sale: Gross Unrealized Gains | 194 | 245
Available-for-Sale: Gross Unrealized Losses | (84,785) | (96,215)
Available-for-Sale: Fair Value | 629,327 | 732,828
Held-to-Maturity: |  |
Held-to-Maturity: Amortized Cost | 1,674,076 | 1,848,239
Held-to-Maturity: Gross Unrealized Gains | 20 | 35
Held-to-Maturity: Gross Unrealized Losses | (265,493) | (294,047)
Held-to-Maturity: Fair Value | 1,408,603 | 1,554,227
Residential - U.S. Government-Sponsored Enterprises |  |
Available-for-Sale: |  |
Available-for-Sale: Amortized Cost | 818,296 | 919,980
Available-for-Sale: Gross Unrealized Gains | 7 | 1
Available-for-Sale: Gross Unrealized Losses | (109,176) | (126,110)
Available-for-Sale: Fair Value | 709,127 | 793,871
Held-to-Maturity: |  |
Held-to-Maturity: Amortized Cost | 2,744,094 | 2,968,322
Held-to-Maturity: Gross Unrealized Gains | 9 | 8
Held-to-Maturity: Gross Unrealized Losses | (369,965) | (397,055)
Held-to-Maturity: Fair Value | 2,374,138 | 2,571,275
Commercial - Government Agencies - Sponsored Agencies |  |
Available-for-Sale: |  |
Available-for-Sale: Amortized Cost | 157,515 | 168,242
Available-for-Sale: Gross Unrealized Losses | (22,592) | (22,575)
Available-for-Sale: Fair Value | 134,923 | 145,667
Held-to-Maturity: |  |
Held-to-Maturity: Amortized Cost | 435,940 | 448,945
Held-to-Maturity: Gross Unrealized Losses | (91,060) | (86,951)
Held-to-Maturity: Fair Value | 344,880 | 361,994
Mortgage-Backed Securities |  |
Available-for-Sale: |  |
Available-for-Sale: Amortized Cost | 1,689,729 | 1,917,020
Available-for-Sale: Gross Unrealized Gains | 201 | 246
Available-for-Sale: Gross Unrealized Losses | (216,553) | (244,900)
Available-for-Sale: Fair Value | 1,473,377 | 1,672,366
Held-to-Maturity: |  |
Held-to-Maturity: Amortized Cost | 4,854,110 | 5,265,506
Held-to-Maturity: Gross Unrealized Gains | 29 | 43
Held-to-Maturity: Gross Unrealized Losses | (726,518) | (778,053)
Held-to-Maturity: Fair Value | $ 4,127,621 | $ 4,487,496

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