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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 | Sep. 30, 2024 | Dec. 31, 2023
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Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items] |  |
Available-for-Sale, Less than 12 months, Fair Value | $ 222,111 | $ 224,979
Available-for-Sale, Less than 12 months, Unrealized Losses | (1,175) | (1,476)
Available-for-Sale, 12 months or longer, Fair Value | 5,563,631 | 5,742,885
Available-for-Sale, 12 months or longer, Unrealized Losses | (736,577) | (872,667)
Available-for-Sale, Fair Value | 5,785,742 | 5,967,864
Available-for-Sale, Unrealized Losses | (737,752) | (874,143)
U.S. Treasury |  |
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items] |  |
Available-for-Sale, Less than 12 months, Fair Value | 1,998 | 8,937
Available-for-Sale, Less than 12 months, Unrealized Losses | (4) | (42)
Available-for-Sale, 12 months or longer, Fair Value | 193,148 | 191,027
Available-for-Sale, 12 months or longer, Unrealized Losses | (13,072) | (11,899)
Available-for-Sale, Fair Value | 195,146 | 199,964
Available-for-Sale, Unrealized Losses | (13,076) | (11,941)
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 | 55,754 | 0
Available-for-Sale, Less than 12 months, Unrealized Losses | (114) | 0
Available-for-Sale, 12 months or longer, Fair Value | 1,209,200 | 1,189,314
Available-for-Sale, 12 months or longer, Unrealized Losses | (160,718) | (192,717)
Available-for-Sale, Fair Value | 1,264,954 | 1,189,314
Available-for-Sale, Unrealized Losses | (160,832) | (192,717)
Mortgage-backed securities |  |
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items] |  |
Available-for-Sale, Less than 12 months, Fair Value | 93,981 | 90,145
Available-for-Sale, Less than 12 months, Unrealized Losses | (786) | (710)
Available-for-Sale, 12 months or longer, Fair Value | 3,633,891 | 3,835,552
Available-for-Sale, 12 months or longer, Unrealized Losses | (526,901) | (621,142)
Available-for-Sale, Fair Value | 3,727,872 | 3,925,697
Available-for-Sale, Unrealized Losses | (527,687) | (621,852)
States and political subdivisions |  |
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items] |  |
Available-for-Sale, Less than 12 months, Fair Value | 22,970 | 86,865
Available-for-Sale, Less than 12 months, Unrealized Losses | (114) | (495)
Available-for-Sale, 12 months or longer, Fair Value | 306,635 | 259,767
Available-for-Sale, 12 months or longer, Unrealized Losses | (20,928) | (22,562)
Available-for-Sale, Fair Value | 329,605 | 346,632
Available-for-Sale, Unrealized Losses | (21,042) | (23,057)
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 | 11,157 | 11,337
Available-for-Sale, 12 months or longer, Unrealized Losses | (2,648) | (2,460)
Available-for-Sale, Fair Value | 11,157 | 11,337
Available-for-Sale, Unrealized Losses | (2,648) | (2,460)
Other securities |  |
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items] |  |
Available-for-Sale, Less than 12 months, Fair Value | 47,408 | 39,032
Available-for-Sale, Less than 12 months, Unrealized Losses | (157) | (229)
Available-for-Sale, 12 months or longer, Fair Value | 209,600 | 255,888
Available-for-Sale, 12 months or longer, Unrealized Losses | (12,310) | (21,887)
Available-for-Sale, Fair Value | 257,008 | 294,920
Available-for-Sale, Unrealized Losses | $ (12,467) | $ (22,116)

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