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Investment Securities - Amortized Cost and Fair Value of Available-for-Sale Investment Securities Portfolio (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Available-for-Sale |  |
Total | $ 7,834,082 | $ 7,684,889
Unrealized Gains | 2,810 | 4,607
Unrealized Losses | (917,039) | (874,143)
Basis adjustments | (128,201) | (102,298)
Fair Value | 6,791,652 | 6,713,055
Held-to-Maturity |  |
Allowance for securities held-to-maturity | (150) | (150)
Total held-to-maturity securities | 3,001,349 | 3,013,493
Unrealized Gains | 864 | 1,800
Unrealized Losses | (454,637) | (414,105)
Basis adjustments | 0 | 0
Fair Value | 2,547,576 | 2,601,188
U.S. Treasury |  |
Available-for-Sale |  |
Total | 291,538 | 449,817
Unrealized Gains | 19 | 154
Unrealized Losses | (9,956) | (11,941)
Basis adjustments | (48,550) | (41,297)
Fair Value | 233,051 | 396,733
U.S. government-sponsored entities and agencies |  |
Available-for-Sale |  |
Total | 1,448,561 | 1,487,879
Unrealized Gains | 0 | 33
Unrealized Losses | (184,941) | (192,717)
Basis adjustments | (80,601) | (63,931)
Fair Value | 1,183,019 | 1,231,264
Held-to-Maturity |  |
Amortized Cost | 827,684 | 825,953
Unrealized Gains | 0 | 0
Unrealized Losses | (164,949) | (154,827)
Basis adjustments | 0 | 0
Fair Value | 662,735 | 671,126
Mortgage-backed securities |  |
Available-for-Sale |  |
Total | 5,223,119 | 4,835,319
Unrealized Gains | 1,996 | 3,093
Unrealized Losses | (675,092) | (621,852)
Basis adjustments | 0 | 0
Fair Value | 4,550,023 | 4,216,560
Held-to-Maturity |  |
Amortized Cost | 1,016,858 | 1,029,131
Unrealized Gains | 0 | 0
Unrealized Losses | (159,201) | (147,137)
Basis adjustments | 0 | 0
Fair Value | 857,657 | 881,994
States and political subdivisions |  |
Available-for-Sale |  |
Total | 537,930 | 554,509
Unrealized Gains | 404 | 878
Unrealized Losses | (24,180) | (23,057)
Basis adjustments | 950 | 2,930
Fair Value | 515,104 | 535,260
Held-to-Maturity |  |
Amortized Cost | 1,156,957 | 1,158,559
Unrealized Gains | 864 | 1,800
Unrealized Losses | (130,487) | (112,141)
Basis adjustments | 0 | 0
Fair Value | 1,027,334 | 1,048,218
Pooled trust preferred securities |  |
Available-for-Sale |  |
Total | 13,800 | 13,797
Unrealized Gains | 0 | 0
Unrealized Losses | (2,526) | (2,460)
Basis adjustments | 0 | 0
Fair Value | 11,274 | 11,337
Other securities |  |
Available-for-Sale |  |
Total | 319,134 | 343,568
Unrealized Gains | 391 | 449
Unrealized Losses | (20,344) | (22,116)
Basis adjustments | 0 | 0
Fair Value | $ 299,181 | $ 321,901

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