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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, 2023 | Dec. 31, 2022
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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 | $ 224,979 | $ 4,465,728
Available-for-Sale, Less than 12 Months, Unrealized Losses | (1,476) | (480,166)
Available-for-Sale, 12 months or longer, Fair Value | 5,742,885 | 1,992,246
Available-for-Sale, 12 months or longer, Unrealized Losses | (872,667) | (367,308)
Available-for-Sale, Fair Value | 5,967,864 | 6,457,974
Available-for-Sale, Unrealized Losses | (874,143) | (847,474)
U.S. Treasury |  |
Schedule Of Available For Sale And Held To Maturity Securities [Line Items] |  |
Available-for-Sale, Less than 12 Months, Fair Value | 8,937 | 130,967
Available-for-Sale, Less than 12 Months, Unrealized Losses | (42) | (3,264)
Available-for-Sale, 12 months or longer, Fair Value | 191,027 | 66,992
Available-for-Sale, 12 months or longer, Unrealized Losses | (11,899) | (1,925)
Available-for-Sale, Fair Value | 199,964 | 197,959
Available-for-Sale, Unrealized Losses | (11,941) | (5,189)
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 | 0 | 454,854
Available-for-Sale, Less than 12 Months, Unrealized Losses | 0 | (75,795)
Available-for-Sale, 12 months or longer, Fair Value | 1,189,314 | 720,226
Available-for-Sale, 12 months or longer, Unrealized Losses | (192,717) | (93,453)
Available-for-Sale, Fair Value | 1,189,314 | 1,175,080
Available-for-Sale, Unrealized Losses | (192,717) | (169,248)
Mortgage-backed securities |  |
Schedule Of Available For Sale And Held To Maturity Securities [Line Items] |  |
Available-for-Sale, Less than 12 Months, Fair Value | 90,145 | 3,207,319
Available-for-Sale, Less than 12 Months, Unrealized Losses | (710) | (358,507)
Available-for-Sale, 12 months or longer, Fair Value | 3,835,552 | 1,116,205
Available-for-Sale, 12 months or longer, Unrealized Losses | (621,142) | (258,921)
Available-for-Sale, Fair Value | 3,925,697 | 4,323,524
Available-for-Sale, Unrealized Losses | (621,852) | (617,428)
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 | 86,865 | 414,813
Available-for-Sale, Less than 12 Months, Unrealized Losses | (495) | (25,555)
Available-for-Sale, 12 months or longer, Fair Value | 259,767 | 2,703
Available-for-Sale, 12 months or longer, Unrealized Losses | (22,562) | (541)
Available-for-Sale, Fair Value | 346,632 | 417,516
Available-for-Sale, Unrealized Losses | (23,057) | (26,096)
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 | 11,337 | 10,811
Available-for-Sale, 12 months or longer, Unrealized Losses | (2,460) | (2,972)
Available-for-Sale, Fair Value | 11,337 | 10,811
Available-for-Sale, Unrealized Losses | (2,460) | (2,972)
Other securities |  |
Schedule Of Available For Sale And Held To Maturity Securities [Line Items] |  |
Available-for-Sale, Less than 12 Months, Fair Value | 39,032 | 257,775
Available-for-Sale, Less than 12 Months, Unrealized Losses | (229) | (17,045)
Available-for-Sale, 12 months or longer, Fair Value | 255,888 | 75,309
Available-for-Sale, 12 months or longer, Unrealized Losses | (21,887) | (9,496)
Available-for-Sale, Fair Value | 294,920 | 333,084
Available-for-Sale, Unrealized Losses | $ (22,116) | $ (26,541)

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