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Investment Securities - Amortized Cost and Fair Value of Available-for-Sale Investment Securities Portfolio (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Available-for-Sale |  |
Total | $ 7,719,944 | $ 7,772,603
Unrealized Gains | 234 | 3,028
Unrealized Losses | (1,143,301) | (847,474)
Basis adjustments | (162,116) | (154,445)
Fair Value | 6,414,761 | 6,773,712
Held-to-Maturity |  |
Allowance for securities held-to-maturity | (150) | (150)
Total held-to-maturity securities | 3,027,914 | 3,089,147
Unrealized Gains | 0 | 221
Unrealized Losses | (634,293) | (445,686)
Basis adjustments | 0 | 0
Fair Value | 2,393,621 | 2,643,682
U.S. Treasury |  |
Available-for-Sale |  |
Total | 616,608 | 253,148
Unrealized Gains | 98 | 5
Unrealized Losses | (10,258) | (5,189)
Basis adjustments | (58,322) | (47,037)
Fair Value | 548,126 | 200,927
U.S. government-sponsored entities and agencies |  |
Available-for-Sale |  |
Total | 1,475,307 | 1,451,736
Unrealized Gains | 0 | 0
Unrealized Losses | (229,113) | (169,248)
Basis adjustments | (103,294) | (107,408)
Fair Value | 1,142,900 | 1,175,080
Held-to-Maturity |  |
Amortized Cost | 824,223 | 819,168
Unrealized Gains | 0 | 0
Unrealized Losses | (207,213) | (162,810)
Basis adjustments | 0 | 0
Fair Value | 617,010 | 656,358
Mortgage-backed securities |  |
Available-for-Sale |  |
Total | 4,686,448 | 4,986,354
Unrealized Gains | 17 | 976
Unrealized Losses | (823,760) | (617,428)
Basis adjustments | 0 | 0
Fair Value | 3,862,705 | 4,369,902
Held-to-Maturity |  |
Amortized Cost | 1,043,585 | 1,106,817
Unrealized Gains | 0 | 0
Unrealized Losses | (195,933) | (123,854)
Basis adjustments | 0 | 0
Fair Value | 847,652 | 982,963
States and political subdivisions |  |
Available-for-Sale |  |
Total | 592,495 | 688,159
Unrealized Gains | 7 | 1,789
Unrealized Losses | (47,058) | (26,096)
Basis adjustments | (500) | 0
Fair Value | 544,944 | 663,852
Held-to-Maturity |  |
Amortized Cost | 1,160,256 | 1,163,312
Unrealized Gains | 0 | 221
Unrealized Losses | (231,147) | (159,022)
Basis adjustments | 0 | 0
Fair Value | 929,109 | 1,004,511
Pooled trust preferred securities |  |
Available-for-Sale |  |
Total | 13,794 | 13,783
Unrealized Gains | 0 | 0
Unrealized Losses | (2,669) | (2,972)
Basis adjustments | 0 | 0
Fair Value | 11,125 | 10,811
Other securities |  |
Available-for-Sale |  |
Total | 335,292 | 379,423
Unrealized Gains | 112 | 258
Unrealized Losses | (30,443) | (26,541)
Basis adjustments | 0 | 0
Fair Value | $ 304,961 | $ 353,140

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