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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 | Dec. 31, 2022 | Dec. 31, 2021
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Schedule Of Available For Sale And Held To Maturity Securities [Line Items] |  |
Available-for-Sale, Less than 12 Months, Fair Value | $ 4,465,728 | $ 3,775,098
Available-for-Sale, Less than 12 Months, Unrealized Losses | (480,166) | (90,987)
Available-for-Sale, 12 months or longer, Fair Value | 1,992,246 | 509,992
Available-for-Sale, 12 months or longer, Unrealized Losses | (367,308) | (27,248)
Available-for-Sale, Fair Value | 6,457,974 | 4,285,090
Available-for-Sale, Unrealized Losses | (847,474) | (118,235)
U.S. Treasury |  |
Schedule Of Available For Sale And Held To Maturity Securities [Line Items] |  |
Available-for-Sale, Less than 12 Months, Fair Value | 130,967 | 91,063
Available-for-Sale, Less than 12 Months, Unrealized Losses | (3,264) | (7,751)
Available-for-Sale, 12 months or longer, Fair Value | 66,992 | 0
Available-for-Sale, 12 months or longer, Unrealized Losses | (1,925) | 0
Available-for-Sale, Fair Value | 197,959 | 91,063
Available-for-Sale, Unrealized Losses | (5,189) | (7,751)
U.S. government-sponsored entities and agencies |  |
Schedule Of Available For Sale And Held To Maturity Securities [Line Items] |  |
Available-for-Sale, Less than 12 Months, Fair Value | 454,854 | 1,032,566
Available-for-Sale, Less than 12 Months, Unrealized Losses | (75,795) | (21,167)
Available-for-Sale, 12 months or longer, Fair Value | 720,226 | 312,949
Available-for-Sale, 12 months or longer, Unrealized Losses | (93,453) | (15,847)
Available-for-Sale, Fair Value | 1,175,080 | 1,345,515
Available-for-Sale, Unrealized Losses | (169,248) | (37,014)
Mortgage-backed securities |  |
Schedule Of Available For Sale And Held To Maturity Securities [Line Items] |  |
Available-for-Sale, Less than 12 Months, Fair Value | 3,207,319 | 2,415,923
Available-for-Sale, Less than 12 Months, Unrealized Losses | (358,507) | (59,277)
Available-for-Sale, 12 months or longer, Fair Value | 1,116,205 | 163,685
Available-for-Sale, 12 months or longer, Unrealized Losses | (258,921) | (6,797)
Available-for-Sale, Fair Value | 4,323,524 | 2,579,608
Available-for-Sale, Unrealized Losses | (617,428) | (66,074)
States and political subdivisions |  |
Schedule Of Available For Sale And Held To Maturity Securities [Line Items] |  |
Available-for-Sale, Less than 12 Months, Fair Value | 414,813 | 178,570
Available-for-Sale, Less than 12 Months, Unrealized Losses | (25,555) | (1,849)
Available-for-Sale, 12 months or longer, Fair Value | 2,703 | 2,729
Available-for-Sale, 12 months or longer, Unrealized Losses | (541) | (33)
Available-for-Sale, Fair Value | 417,516 | 181,299
Available-for-Sale, Unrealized Losses | (26,096) | (1,882)
Pooled trust preferred securities |  |
Schedule Of Available For Sale And Held To Maturity Securities [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 | 10,811 | 9,496
Available-for-Sale, 12 months or longer, Unrealized Losses | (2,972) | (4,260)
Available-for-Sale, Fair Value | 10,811 | 9,496
Available-for-Sale, Unrealized Losses | (2,972) | (4,260)
Other securities |  |
Schedule Of Available For Sale And Held To Maturity Securities [Line Items] |  |
Available-for-Sale, Less than 12 Months, Fair Value | 257,775 | 56,976
Available-for-Sale, Less than 12 Months, Unrealized Losses | (17,045) | (943)
Available-for-Sale, 12 months or longer, Fair Value | 75,309 | 21,133
Available-for-Sale, 12 months or longer, Unrealized Losses | (9,496) | (311)
Available-for-Sale, Fair Value | 333,084 | 78,109
Available-for-Sale, Unrealized Losses | $ (26,541) | $ (1,254)

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