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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 | Mar. 31, 2025 | Dec. 31, 2024
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Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items] |  |
Available-for-Sale, Less than 12 months, Fair Value | $ 524,251 | $ 1,126,895
Available-for-Sale, Less than 12 months, Unrealized Losses | (4,038) | (12,668)
Available-for-Sale, 12 months or longer, Fair Value | 5,209,608 | 5,218,733
Available-for-Sale, 12 months or longer, Unrealized Losses | (792,895) | (884,848)
Available-for-Sale, Fair Value | 5,733,859 | 6,345,628
Available-for-Sale, Unrealized Losses | (796,933) | (897,516)
U.S. Treasury |  |
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items] |  |
Available-for-Sale, Less than 12 months, Fair Value | 1,990 | 3,977
Available-for-Sale, Less than 12 months, Unrealized Losses | (12) | (26)
Available-for-Sale, 12 months or longer, Fair Value | 181,477 | 177,691
Available-for-Sale, 12 months or longer, Unrealized Losses | (10,919) | (12,633)
Available-for-Sale, Fair Value | 183,467 | 181,668
Available-for-Sale, Unrealized Losses | (10,931) | (12,659)
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 | 69,755 | 98,280
Available-for-Sale, Less than 12 months, Unrealized Losses | (407) | (1,713)
Available-for-Sale, 12 months or longer, Fair Value | 1,159,566 | 1,144,618
Available-for-Sale, 12 months or longer, Unrealized Losses | (161,277) | (179,647)
Available-for-Sale, Fair Value | 1,229,321 | 1,242,898
Available-for-Sale, Unrealized Losses | (161,684) | (181,360)
Mortgage-backed securities |  |
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items] |  |
Available-for-Sale, Less than 12 months, Fair Value | 341,754 | 857,440
Available-for-Sale, Less than 12 months, Unrealized Losses | (1,990) | (9,172)
Available-for-Sale, 12 months or longer, Fair Value | 3,389,956 | 3,406,350
Available-for-Sale, 12 months or longer, Unrealized Losses | (580,811) | (653,009)
Available-for-Sale, Fair Value | 3,731,710 | 4,263,790
Available-for-Sale, Unrealized Losses | (582,801) | (662,181)
States and political subdivisions |  |
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items] |  |
Available-for-Sale, Less than 12 months, Fair Value | 94,378 | 133,906
Available-for-Sale, Less than 12 months, Unrealized Losses | (1,592) | (1,462)
Available-for-Sale, 12 months or longer, Fair Value | 261,158 | 279,121
Available-for-Sale, 12 months or longer, Unrealized Losses | (27,481) | (24,419)
Available-for-Sale, Fair Value | 355,536 | 413,027
Available-for-Sale, Unrealized Losses | (29,073) | (25,881)
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 | 11,311 | 11,322
Available-for-Sale, 12 months or longer, Unrealized Losses | (2,498) | (2,485)
Available-for-Sale, Fair Value | 11,311 | 11,322
Available-for-Sale, Unrealized Losses | (2,498) | (2,485)
Other securities |  |
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items] |  |
Available-for-Sale, Less than 12 months, Fair Value | 16,374 | 33,292
Available-for-Sale, Less than 12 months, Unrealized Losses | (37) | (295)
Available-for-Sale, 12 months or longer, Fair Value | 206,140 | 199,631
Available-for-Sale, 12 months or longer, Unrealized Losses | (9,909) | (12,655)
Available-for-Sale, Fair Value | 222,514 | 232,923
Available-for-Sale, Unrealized Losses | $ (9,946) | $ (12,950)

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