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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, 2024 | Dec. 31, 2023
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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 | $ 1,126,895 | $ 224,979
Available-for-Sale, Less than 12 Months, Unrealized Losses | (12,668) | (1,476)
Available-for-Sale, 12 months or longer, Fair Value | 5,218,733 | 5,742,885
Available-for-Sale, 12 months or longer, Unrealized Losses | (884,848) | (872,667)
Available-for-Sale, Fair Value | 6,345,628 | 5,967,864
Available-for-Sale, Unrealized Losses | (897,516) | (874,143)
U.S. Treasury |  |
Schedule Of Available For Sale And Held To Maturity Securities [Line Items] |  |
Available-for-Sale, Less than 12 Months, Fair Value | 3,977 | 8,937
Available-for-Sale, Less than 12 Months, Unrealized Losses | (26) | (42)
Available-for-Sale, 12 months or longer, Fair Value | 177,691 | 191,027
Available-for-Sale, 12 months or longer, Unrealized Losses | (12,633) | (11,899)
Available-for-Sale, Fair Value | 181,668 | 199,964
Available-for-Sale, Unrealized Losses | (12,659) | (11,941)
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 | 98,280 | 0
Available-for-Sale, Less than 12 Months, Unrealized Losses | (1,713) | 0
Available-for-Sale, 12 months or longer, Fair Value | 1,144,618 | 1,189,314
Available-for-Sale, 12 months or longer, Unrealized Losses | (179,647) | (192,717)
Available-for-Sale, Fair Value | 1,242,898 | 1,189,314
Available-for-Sale, Unrealized Losses | (181,360) | (192,717)
Mortgage-backed securities |  |
Schedule Of Available For Sale And Held To Maturity Securities [Line Items] |  |
Available-for-Sale, Less than 12 Months, Fair Value | 857,440 | 90,145
Available-for-Sale, Less than 12 Months, Unrealized Losses | (9,172) | (710)
Available-for-Sale, 12 months or longer, Fair Value | 3,406,350 | 3,835,552
Available-for-Sale, 12 months or longer, Unrealized Losses | (653,009) | (621,142)
Available-for-Sale, Fair Value | 4,263,790 | 3,925,697
Available-for-Sale, Unrealized Losses | (662,181) | (621,852)
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 | 133,906 | 86,865
Available-for-Sale, Less than 12 Months, Unrealized Losses | (1,462) | (495)
Available-for-Sale, 12 months or longer, Fair Value | 279,121 | 259,767
Available-for-Sale, 12 months or longer, Unrealized Losses | (24,419) | (22,562)
Available-for-Sale, Fair Value | 413,027 | 346,632
Available-for-Sale, Unrealized Losses | (25,881) | (23,057)
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 | 11,322 | 11,337
Available-for-Sale, 12 months or longer, Unrealized Losses | (2,485) | (2,460)
Available-for-Sale, Fair Value | 11,322 | 11,337
Available-for-Sale, Unrealized Losses | (2,485) | (2,460)
Other securities |  |
Schedule Of Available For Sale And Held To Maturity Securities [Line Items] |  |
Available-for-Sale, Less than 12 Months, Fair Value | 33,292 | 39,032
Available-for-Sale, Less than 12 Months, Unrealized Losses | (295) | (229)
Available-for-Sale, 12 months or longer, Fair Value | 199,631 | 255,888
Available-for-Sale, 12 months or longer, Unrealized Losses | (12,655) | (21,887)
Available-for-Sale, Fair Value | 232,923 | 294,920
Available-for-Sale, Unrealized Losses | $ (12,950) | $ (22,116)

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