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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 | Jun. 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 | $ 735,456 | $ 4,465,728
Available-for-sale, less than 12 months, unrealized losses | (21,643) | (480,166)
Available-for-sale, 12 months or longer, fair value | 5,566,702 | 1,992,246
Available-for-sale, 12 months or longer, unrealized losses | (914,123) | (367,308)
Available-for-sale, fair value | 6,302,158 | 6,457,974
Available-for-sale, unrealized losses | (935,766) | (847,474)
U.S. Treasury |  |
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items] |  |
Available-for-sale, less than 12 months, fair value | 124,751 | 130,967
Available-for-sale, less than 12 months, unrealized losses | (258) | (3,264)
Available-for-sale, 12 months or longer, fair value | 187,661 | 66,992
Available-for-sale, 12 months or longer, unrealized losses | (8,987) | (1,925)
Available-for-sale, fair value | 312,412 | 197,959
Available-for-sale, unrealized losses | (9,245) | (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 | 14,732 | 454,854
Available-for-sale, less than 12 months, unrealized losses | (264) | (75,795)
Available-for-sale, 12 months or longer, fair value | 1,159,624 | 720,226
Available-for-sale, 12 months or longer, unrealized losses | (201,359) | (93,453)
Available-for-sale, fair value | 1,174,356 | 1,175,080
Available-for-sale, unrealized losses | (201,623) | (169,248)
Mortgage-backed securities |  |
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items] |  |
Available-for-sale, less than 12 months, fair value | 402,696 | 3,207,319
Available-for-sale, less than 12 months, unrealized losses | (19,217) | (358,507)
Available-for-sale, 12 months or longer, fair value | 3,677,906 | 1,116,205
Available-for-sale, 12 months or longer, unrealized losses | (644,056) | (258,921)
Available-for-sale, fair value | 4,080,602 | 4,323,524
Available-for-sale, unrealized losses | (663,273) | (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 | 168,144 | 414,813
Available-for-sale, less than 12 months, unrealized losses | (1,406) | (25,555)
Available-for-sale, 12 months or longer, fair value | 264,829 | 2,703
Available-for-sale, 12 months or longer, unrealized losses | (23,852) | (541)
Available-for-sale, fair value | 432,973 | 417,516
Available-for-sale, unrealized losses | (25,258) | (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 | 10,994 | 10,811
Available-for-sale, 12 months or longer, unrealized losses | (2,797) | (2,972)
Available-for-sale, fair value | 10,994 | 10,811
Available-for-sale, unrealized losses | (2,797) | (2,972)
Other securities |  |
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items] |  |
Available-for-sale, less than 12 months, fair value | 25,133 | 257,775
Available-for-sale, less than 12 months, unrealized losses | (498) | (17,045)
Available-for-sale, 12 months or longer, fair value | 265,688 | 75,309
Available-for-sale, 12 months or longer, unrealized losses | (33,072) | (9,496)
Available-for-sale, fair value | 290,821 | 333,084
Available-for-sale, unrealized losses | $ (33,570) | $ (26,541)

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