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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, 2024 | Dec. 31, 2023
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Available-for-Sale: |  |
Available-for-Sale: Amortized Cost | $ 2,947,415 | $ 2,694,012
Available-for-Sale: Gross Unrealized Gains | 1,248 | 704
Available-for-Sale: Gross Unrealized Losses | (259,135) | (285,783)
Available-for-Sale: Fair Value | 2,689,528 | 2,408,933
Held-to-Maturity: |  |
Held-to-Maturity: Amortized Cost | 4,618,543 | 4,997,335
Held-to-Maturity: Gross Unrealized Gains | 40 | 29
Held-to-Maturity: Gross Unrealized Losses | (797,701) | (743,727)
Held-to-Maturity: Fair Value | 3,820,882 | 4,253,637
Debt Securities Issued by the U.S. Treasury and Government Agencies |  |
Available-for-Sale: |  |
Available-for-Sale: Amortized Cost | 257,036 | 223,308
Available-for-Sale: Gross Unrealized Gains | 221 | 361
Available-for-Sale: Gross Unrealized Losses | (8,185) | (11,096)
Available-for-Sale: Fair Value | 249,072 | 212,573
Held-to-Maturity: |  |
Held-to-Maturity: Amortized Cost | 131,868 | 131,742
Held-to-Maturity: Gross Unrealized Losses | (14,927) | (15,211)
Held-to-Maturity: Fair Value | 116,941 | 116,531
Debt Securities Issued by States and Political Subdivisions |  |
Available-for-Sale: |  |
Available-for-Sale: Amortized Cost | 73,208 | 73,417
Available-for-Sale: Gross Unrealized Gains |  | 0
Available-for-Sale: Gross Unrealized Losses | (9,349) | (9,611)
Available-for-Sale: Fair Value | 63,859 | 63,806
Debt Securities Issued by Government-Sponsored Enterprises |  |
Available-for-Sale: |  |
Available-for-Sale: Amortized Cost | 1,505 | 1,556
Available-for-Sale: Gross Unrealized Losses | (41) | (80)
Available-for-Sale: Fair Value | 1,464 | 1,476
Debt Securities Issued by Corporations |  |
Available-for-Sale: |  |
Available-for-Sale: Amortized Cost | 703,579 | 706,002
Available-for-Sale: Gross Unrealized Gains | 376 | 142
Available-for-Sale: Gross Unrealized Losses | (32,280) | (48,443)
Available-for-Sale: Fair Value | 671,675 | 657,701
Held-to-Maturity: |  |
Held-to-Maturity: Amortized Cost | 10,490 | 11,483
Held-to-Maturity: Gross Unrealized Losses | (2,156) | (1,998)
Held-to-Maturity: Fair Value | 8,334 | 9,485
Residential - Government Agencies or Sponsored Enterprises |  |
Available-for-Sale: |  |
Available-for-Sale: Amortized Cost | 1,050,299 | 892,513
Available-for-Sale: Gross Unrealized Gains | 322 | 1
Available-for-Sale: Gross Unrealized Losses | (115,401) | (118,151)
Available-for-Sale: Fair Value | 935,220 | 774,363
Held-to-Maturity: |  |
Held-to-Maturity: Amortized Cost | 2,185,210 | 2,383,375
Held-to-Maturity: Gross Unrealized Gains | 3 | 3
Held-to-Maturity: Gross Unrealized Losses | (377,149) | (361,295)
Held-to-Maturity: Fair Value | 1,808,064 | 2,022,083
Commercial - Government Agencies or Sponsored Enterprises |  |
Available-for-Sale: |  |
Available-for-Sale: Amortized Cost | 306,696 | 157,515
Available-for-Sale: Gross Unrealized Gains | 199 |
Available-for-Sale: Gross Unrealized Losses | (23,421) | (22,592)
Available-for-Sale: Fair Value | 283,474 | 134,923
Held-to-Maturity: |  |
Held-to-Maturity: Amortized Cost | 416,389 | 425,935
Held-to-Maturity: Gross Unrealized Losses | (92,211) | (88,932)
Held-to-Maturity: Fair Value | 324,178 | 337,003
Collateralized Mortgage Obligations |  |
Available-for-Sale: |  |
Available-for-Sale: Amortized Cost | 1,356,995 | 1,050,028
Available-for-Sale: Gross Unrealized Gains | 521 | 1
Available-for-Sale: Gross Unrealized Losses | (138,822) | (140,743)
Available-for-Sale: Fair Value | 1,218,694 | 909,286
Held-to-Maturity: |  |
Held-to-Maturity: Amortized Cost | 2,601,599 | 2,809,310
Held-to-Maturity: Gross Unrealized Gains | 3 | 3
Held-to-Maturity: Gross Unrealized Losses | (469,360) | (450,227)
Held-to-Maturity: Fair Value | 2,132,242 | 2,359,086
Residential - Government Agencies or Sponsored Enterprises |  |
Available-for-Sale: |  |
Available-for-Sale: Amortized Cost | 555,092 | 639,701
Available-for-Sale: Gross Unrealized Gains | 130 | 200
Available-for-Sale: Gross Unrealized Losses | (70,458) | (75,810)
Available-for-Sale: Fair Value | 484,764 | 564,091
Held-to-Maturity: |  |
Held-to-Maturity: Amortized Cost | 1,864,591 | 2,034,794
Held-to-Maturity: Gross Unrealized Gains | 37 | 26
Held-to-Maturity: Gross Unrealized Losses | (309,093) | (274,162)
Held-to-Maturity: Fair Value | 1,555,535 | 1,760,658
Commercial - Government Agencies or Sponsored Enterprises |  |
Held-to-Maturity: |  |
Held-to-Maturity: Amortized Cost | 9,995 | 10,006
Held-to-Maturity: Gross Unrealized Losses | (2,165) | (2,129)
Held-to-Maturity: Fair Value | 7,830 | 7,877
Mortgage-Backed Securities |  |
Available-for-Sale: |  |
Available-for-Sale: Amortized Cost | 555,092 | 639,701
Available-for-Sale: Gross Unrealized Gains | 130 | 200
Available-for-Sale: Gross Unrealized Losses | (70,458) | (75,810)
Available-for-Sale: Fair Value | 484,764 | 564,091
Held-to-Maturity: |  |
Held-to-Maturity: Amortized Cost | 1,874,586 | 2,044,800
Held-to-Maturity: Gross Unrealized Gains | 37 | 26
Held-to-Maturity: Gross Unrealized Losses | (311,258) | (276,291)
Held-to-Maturity: Fair Value | $ 1,563,365 | $ 1,768,535

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