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Investment Securities - Available-for-Sale and Held-to-Maturity Investment Securities with Unrealized Losses by Aggregated Major Security Type and Length of Time in Continuous Unrealized Loss Position (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
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Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items] |  |
Available-for-sale, less than 12 months, fair value | $ 465,307 | $ 4,465,728
Available-for-sale, less than 12 months, unrealized losses | (14,072) | (480,166)
Available-for-sale, 12 months or longer, fair value | 5,559,525 | 1,992,246
Available-for-sale, 12 months or longer, unrealized losses | (1,129,229) | (367,308)
Available-for-sale, fair value | 6,024,832 | 6,457,974
Available-for-sale, unrealized losses | (1,143,301) | (847,474)
U.S. Treasury |  |
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items] |  |
Available-for-sale, less than 12 months, fair value | 37,492 | 130,967
Available-for-sale, less than 12 months, unrealized losses | (144) | (3,264)
Available-for-sale, 12 months or longer, fair value | 178,540 | 66,992
Available-for-sale, 12 months or longer, unrealized losses | (10,114) | (1,925)
Available-for-sale, fair value | 216,032 | 197,959
Available-for-sale, unrealized losses | (10,258) | (5,189)
U.S. government-sponsored entities and agencies |  |
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items] |  |
Available-for-sale, less than 12 months, fair value | 32,821 | 454,854
Available-for-sale, less than 12 months, unrealized losses | (58) | (75,795)
Available-for-sale, 12 months or longer, fair value | 1,110,079 | 720,226
Available-for-sale, 12 months or longer, unrealized losses | (229,055) | (93,453)
Available-for-sale, fair value | 1,142,900 | 1,175,080
Available-for-sale, unrealized losses | (229,113) | (169,248)
Mortgage-backed securities |  |
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items] |  |
Available-for-sale, less than 12 months, fair value | 124,895 | 3,207,319
Available-for-sale, less than 12 months, unrealized losses | (5,798) | (358,507)
Available-for-sale, 12 months or longer, fair value | 3,736,306 | 1,116,205
Available-for-sale, 12 months or longer, unrealized losses | (817,962) | (258,921)
Available-for-sale, fair value | 3,861,201 | 4,323,524
Available-for-sale, unrealized losses | (823,760) | (617,428)
States and political subdivisions |  |
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items] |  |
Available-for-sale, less than 12 months, fair value | 258,362 | 414,813
Available-for-sale, less than 12 months, unrealized losses | (7,749) | (25,555)
Available-for-sale, 12 months or longer, fair value | 260,563 | 2,703
Available-for-sale, 12 months or longer, unrealized losses | (39,309) | (541)
Available-for-sale, fair value | 518,925 | 417,516
Available-for-sale, unrealized losses | (47,058) | (26,096)
Pooled trust preferred securities |  |
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items] |  |
Available-for-sale, less than 12 months, fair value | 0 | 0
Available-for-sale, less than 12 months, unrealized losses | 0 | 0
Available-for-sale, 12 months or longer, fair value | 11,125 | 10,811
Available-for-sale, 12 months or longer, unrealized losses | (2,669) | (2,972)
Available-for-sale, fair value | 11,125 | 10,811
Available-for-sale, unrealized losses | (2,669) | (2,972)
Other securities |  |
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items] |  |
Available-for-sale, less than 12 months, fair value | 11,737 | 257,775
Available-for-sale, less than 12 months, unrealized losses | (323) | (17,045)
Available-for-sale, 12 months or longer, fair value | 262,912 | 75,309
Available-for-sale, 12 months or longer, unrealized losses | (30,120) | (9,496)
Available-for-sale, fair value | 274,649 | 333,084
Available-for-sale, unrealized losses | $ (30,443) | $ (26,541)

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