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Investment Securities - Amortized Cost and Fair Value of Available-for-Sale Investment Securities Portfolio (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Available-for-Sale |  |
Amortized Cost | $ 7,684,889 | $ 7,772,603
Unrealized Gains | 4,607 | 3,028
Unrealized Losses | (874,143) | (847,474)
Basis Adjustments | (102,298) | (154,445)
Fair Value | 6,713,055 | 6,773,712
Held-to-Maturity |  |
Allowance for securities held-to-maturity | (150) | (150)
Total held-to-maturity securities | 3,013,493 | 3,089,147
Unrealized Gains | 1,800 | 221
Unrealized Losses | (414,105) | (445,686)
Basis adjustments | 0 | 0
Investment securities-held-to-maturity, fair value | 2,601,188 | 2,643,682
U.S. Treasury |  |
Available-for-Sale |  |
Amortized Cost | 449,817 | 253,148
Unrealized Gains | 154 | 5
Unrealized Losses | (11,941) | (5,189)
Basis Adjustments | (41,297) | (47,037)
Fair Value | 396,733 | 200,927
U.S. government-sponsored entities and agencies |  |
Available-for-Sale |  |
Amortized Cost | 1,487,879 | 1,451,736
Unrealized Gains | 33 | 0
Unrealized Losses | (192,717) | (169,248)
Basis Adjustments | (63,931) | (107,408)
Fair Value | 1,231,264 | 1,175,080
Held-to-Maturity |  |
Amortized Cost | 825,953 | 819,168
Unrealized Gains | 0 | 0
Unrealized Losses | (154,827) | (162,810)
Basis adjustments | 0 | 0
Investment securities-held-to-maturity, fair value | 671,126 | 656,358
Mortgage-backed securities |  |
Available-for-Sale |  |
Amortized Cost | 4,835,319 | 4,986,354
Unrealized Gains | 3,093 | 976
Unrealized Losses | (621,852) | (617,428)
Basis Adjustments | 0 | 0
Fair Value | 4,216,560 | 4,369,902
Held-to-Maturity |  |
Amortized Cost | 1,029,131 | 1,106,817
Unrealized Gains | 0 | 0
Unrealized Losses | (147,137) | (123,854)
Basis adjustments | 0 | 0
Investment securities-held-to-maturity, fair value | 881,994 | 982,963
States and political subdivisions |  |
Available-for-Sale |  |
Amortized Cost | 554,509 | 688,159
Unrealized Gains | 878 | 1,789
Unrealized Losses | (23,057) | (26,096)
Basis Adjustments | 2,930 | 0
Fair Value | 535,260 | 663,852
Held-to-Maturity |  |
Amortized Cost | 1,158,559 | 1,163,312
Unrealized Gains | 1,800 | 221
Unrealized Losses | (112,141) | (159,022)
Basis adjustments | 0 | 0
Investment securities-held-to-maturity, fair value | 1,048,218 | 1,004,511
Pooled trust preferred securities |  |
Available-for-Sale |  |
Amortized Cost | 13,797 | 13,783
Unrealized Gains | 0 | 0
Unrealized Losses | (2,460) | (2,972)
Basis Adjustments | 0 | 0
Fair Value | 11,337 | 10,811
Other securities |  |
Available-for-Sale |  |
Amortized Cost | 343,568 | 379,423
Unrealized Gains | 449 | 258
Unrealized Losses | (22,116) | (26,541)
Basis Adjustments | 0 | 0
Fair Value | $ 321,901 | $ 353,140

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