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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, 2021 | Dec. 31, 2020
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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 | $ 3,775,098 | $ 654,262
Available-for-Sale, Less than 12 Months, Unrealized Losses | (90,987) | (4,917)
Available-for-Sale, 12 months or longer, Fair Value | 509,992 | 36,356
Available-for-Sale, 12 months or longer, Unrealized Losses | (27,248) | (6,468)
Available-for-Sale, Fair Value | 4,285,090 | 690,618
Available-for-Sale, Unrealized Losses | (118,235) | (11,385)
U.S. Treasury |  |
Schedule Of Available For Sale And Held To Maturity Securities [Line Items] |  |
Available-for-Sale, Less than 12 Months, Fair Value | 91,063 |
Available-for-Sale, Less than 12 Months, Unrealized Losses | (7,751) |
Available-for-Sale, 12 months or longer, Fair Value | 0 |
Available-for-Sale, 12 months or longer, Unrealized Losses | 0 |
Available-for-Sale, Fair Value | 91,063 |
Available-for-Sale, Unrealized Losses | (7,751) | 0
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 | 1,032,566 | 355,528
Available-for-Sale, Less than 12 Months, Unrealized Losses | (21,167) | (3,921)
Available-for-Sale, 12 months or longer, Fair Value | 312,949 | 0
Available-for-Sale, 12 months or longer, Unrealized Losses | (15,847) | 0
Available-for-Sale, Fair Value | 1,345,515 | 355,528
Available-for-Sale, Unrealized Losses | (37,014) | (3,921)
Mortgage-backed securities |  |
Schedule Of Available For Sale And Held To Maturity Securities [Line Items] |  |
Available-for-Sale, Less than 12 Months, Fair Value | 2,415,923 | 275,833
Available-for-Sale, Less than 12 Months, Unrealized Losses | (59,277) | (895)
Available-for-Sale, 12 months or longer, Fair Value | 163,685 | 3,572
Available-for-Sale, 12 months or longer, Unrealized Losses | (6,797) | (95)
Available-for-Sale, Fair Value | 2,579,608 | 279,405
Available-for-Sale, Unrealized Losses | (66,074) | (990)
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 | 178,570 | 3,497
Available-for-Sale, Less than 12 Months, Unrealized Losses | (1,849) | (31)
Available-for-Sale, 12 months or longer, Fair Value | 2,729 | 0
Available-for-Sale, 12 months or longer, Unrealized Losses | (33) | 0
Available-for-Sale, Fair Value | 181,299 | 3,497
Available-for-Sale, Unrealized Losses | (1,882) | (31)
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 | 9,496 | 7,913
Available-for-Sale, 12 months or longer, Unrealized Losses | (4,260) | (5,850)
Available-for-Sale, Fair Value | 9,496 | 7,913
Available-for-Sale, Unrealized Losses | (4,260) | (5,850)
Other securities |  |
Schedule Of Available For Sale And Held To Maturity Securities [Line Items] |  |
Available-for-Sale, Less than 12 Months, Fair Value | 56,976 | 19,404
Available-for-Sale, Less than 12 Months, Unrealized Losses | (943) | (70)
Available-for-Sale, 12 months or longer, Fair Value | 21,133 | 24,871
Available-for-Sale, 12 months or longer, Unrealized Losses | (311) | (523)
Available-for-Sale, Fair Value | 78,109 | 44,275
Available-for-Sale, Unrealized Losses | $ (1,254) | $ (593)

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