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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 | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Available-for-Sale: |  |
Available-for-Sale: Amortized Cost | $ 2,642,728 | $ 2,694,012
Available-for-Sale: Gross Unrealized Gains | 635 | 704
Available-for-Sale: Gross Unrealized Losses | (291,312) | (285,783)
Available-for-Sale: Fair Value | 2,352,051 | 2,408,933
Held-to-Maturity: |  |
Held-to-Maturity: Amortized Cost | 4,913,457 | 4,997,335
Held-to-Maturity: Gross Unrealized Gains | 25 | 29
Held-to-Maturity: Gross Unrealized Losses | (808,860) | (743,727)
Held-to-Maturity: Fair Value | 4,104,622 | 4,253,637
Debt Securities Issued by the U.S. Treasury and Government Agencies |  |
Available-for-Sale: |  |
Available-for-Sale: Amortized Cost | 217,711 | 223,308
Available-for-Sale: Gross Unrealized Gains | 267 | 361
Available-for-Sale: Gross Unrealized Losses | (11,666) | (11,096)
Available-for-Sale: Fair Value | 206,312 | 212,573
Held-to-Maturity: |  |
Held-to-Maturity: Amortized Cost | 131,773 | 131,742
Held-to-Maturity: Gross Unrealized Losses | (16,655) | (15,211)
Held-to-Maturity: Fair Value | 115,118 | 116,531
Debt Securities Issued by States and Political Subdivisions |  |
Available-for-Sale: |  |
Available-for-Sale: Amortized Cost | 73,337 | 73,417
Available-for-Sale: Gross Unrealized Losses | (9,886) | (9,611)
Available-for-Sale: Fair Value | 63,451 | 63,806
Debt Securities Issued by Government-Sponsored Enterprises |  |
Available-for-Sale: |  |
Available-for-Sale: Amortized Cost | 1,506 | 1,556
Available-for-Sale: Gross Unrealized Losses | (81) | (80)
Available-for-Sale: Fair Value | 1,425 | 1,476
Debt Securities Issued by Corporations |  |
Available-for-Sale: |  |
Available-for-Sale: Amortized Cost | 705,308 | 706,002
Available-for-Sale: Gross Unrealized Gains | 244 | 142
Available-for-Sale: Gross Unrealized Losses | (44,406) | (48,443)
Available-for-Sale: Fair Value | 661,146 | 657,701
Held-to-Maturity: |  |
Held-to-Maturity: Amortized Cost | 11,176 | 11,483
Held-to-Maturity: Gross Unrealized Losses | (2,126) | (1,998)
Held-to-Maturity: Fair Value | 9,050 | 9,485
Residential - Government Agencies |  |
Available-for-Sale: |  |
Available-for-Sale: Amortized Cost | 691,565 | 713,918
Available-for-Sale: Gross Unrealized Gains | 119 | 194
Available-for-Sale: Gross Unrealized Losses | (89,408) | (84,785)
Available-for-Sale: Fair Value | 602,276 | 629,327
Held-to-Maturity: |  |
Held-to-Maturity: Amortized Cost | 1,639,458 | 1,674,076
Held-to-Maturity: Gross Unrealized Gains | 15 | 20
Held-to-Maturity: Gross Unrealized Losses | (283,447) | (265,493)
Held-to-Maturity: Fair Value | 1,356,026 | 1,408,603
Residential - U.S. Government-Sponsored Enterprises |  |
Available-for-Sale: |  |
Available-for-Sale: Amortized Cost | 797,610 | 818,296
Available-for-Sale: Gross Unrealized Gains | 5 | 7
Available-for-Sale: Gross Unrealized Losses | (113,042) | (109,176)
Available-for-Sale: Fair Value | 684,573 | 709,127
Held-to-Maturity: |  |
Held-to-Maturity: Amortized Cost | 2,697,411 | 2,744,094
Held-to-Maturity: Gross Unrealized Gains | 10 | 9
Held-to-Maturity: Gross Unrealized Losses | (412,329) | (369,965)
Held-to-Maturity: Fair Value | 2,285,092 | 2,374,138
Commercial - Government Agencies or Sponsored Agencies |  |
Available-for-Sale: |  |
Available-for-Sale: Amortized Cost | 155,691 | 157,515
Available-for-Sale: Gross Unrealized Losses | (22,823) | (22,592)
Available-for-Sale: Fair Value | 132,868 | 134,923
Held-to-Maturity: |  |
Held-to-Maturity: Amortized Cost | 433,639 | 435,940
Held-to-Maturity: Gross Unrealized Losses | (94,303) | (91,060)
Held-to-Maturity: Fair Value | 339,336 | 344,880
Mortgage-Backed Securities |  |
Available-for-Sale: |  |
Available-for-Sale: Amortized Cost | 1,644,866 | 1,689,729
Available-for-Sale: Gross Unrealized Gains | 124 | 201
Available-for-Sale: Gross Unrealized Losses | (225,273) | (216,553)
Available-for-Sale: Fair Value | 1,419,717 | 1,473,377
Held-to-Maturity: |  |
Held-to-Maturity: Amortized Cost | 4,770,508 | 4,854,110
Held-to-Maturity: Gross Unrealized Gains | 25 | 29
Held-to-Maturity: Gross Unrealized Losses | (790,079) | (726,518)
Held-to-Maturity: Fair Value | $ 3,980,454 | $ 4,127,621

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