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Investment Securities - Available-for-Sale 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, 2022 | Dec. 31, 2021
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Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items] |  |
Available-for-Sale, Less than 12 Months, Fair Value | $ 6,315,610 | $ 3,775,098
Available-for-Sale, Less than 12 Months, Unrealized Losses | (286,288) | (90,987)
Available-for-Sale, 12 months or longer, Fair Value | 1,388,842 | 509,992
Available-for-Sale, 12 months or longer, Unrealized Losses | (181,629) | (27,248)
Available-for-Sale, Fair Value | 7,704,452 | 4,285,090
Available-for-Sale, Unrealized Losses | (467,917) | (118,235)
U.S. Treasury |  |
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items] |  |
Available-for-Sale, Less than 12 Months, Fair Value | 419,024 | 91,063
Available-for-Sale, Less than 12 Months, Unrealized Losses | (8,887) | (7,751)
Available-for-Sale, 12 months or longer, Fair Value | 0 | 0
Available-for-Sale, 12 months or longer, Unrealized Losses | 0 | 0
Available-for-Sale, Fair Value | 419,024 | 91,063
Available-for-Sale, Unrealized Losses | (8,887) | (7,751)
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 | 987,337 | 1,032,566
Available-for-Sale, Less than 12 Months, Unrealized Losses | (73,226) | (21,167)
Available-for-Sale, 12 months or longer, Fair Value | 531,640 | 312,949
Available-for-Sale, 12 months or longer, Unrealized Losses | (77,027) | (15,847)
Available-for-Sale, Fair Value | 1,518,977 | 1,345,515
Available-for-Sale, Unrealized Losses | (150,253) | (37,014)
Mortgage-backed securities |  |
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items] |  |
Available-for-Sale, Less than 12 Months, Fair Value | 4,355,133 | 2,415,923
Available-for-Sale, Less than 12 Months, Unrealized Losses | (184,282) | (59,277)
Available-for-Sale, 12 months or longer, Fair Value | 823,217 | 163,685
Available-for-Sale, 12 months or longer, Unrealized Losses | (99,177) | (6,797)
Available-for-Sale, Fair Value | 5,178,350 | 2,579,608
Available-for-Sale, Unrealized Losses | (283,459) | (66,074)
States and political subdivisions |  |
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items] |  |
Available-for-Sale, Less than 12 Months, Fair Value | 276,808 | 178,570
Available-for-Sale, Less than 12 Months, Unrealized Losses | (9,885) | (1,849)
Available-for-Sale, 12 months or longer, Fair Value | 0 | 2,729
Available-for-Sale, 12 months or longer, Unrealized Losses | 0 | (33)
Available-for-Sale, Fair Value | 276,808 | 181,299
Available-for-Sale, Unrealized Losses | (9,885) | (1,882)
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 | 9,664 | 9,496
Available-for-Sale, 12 months or longer, Unrealized Losses | (4,097) | (4,260)
Available-for-Sale, Fair Value | 9,664 | 9,496
Available-for-Sale, Unrealized Losses | (4,097) | (4,260)
Other securities |  |
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items] |  |
Available-for-Sale, Less than 12 Months, Fair Value | 277,308 | 56,976
Available-for-Sale, Less than 12 Months, Unrealized Losses | (10,008) | (943)
Available-for-Sale, 12 months or longer, Fair Value | 24,321 | 21,133
Available-for-Sale, 12 months or longer, Unrealized Losses | (1,328) | (311)
Available-for-Sale, Fair Value | 301,629 | 78,109
Available-for-Sale, Unrealized Losses | $ (11,336) | $ (1,254)

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- Definition Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27161-111563 + Details
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