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Investment Securities - Securities With Unrealized Losses (Details) $ in Thousands | Mar. 31, 2022 USD ($)
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Debt Securities, Available-for-sale [Line Items] |
Available-for-sale, less than 12 months, estimated fair value | $ 4,087,530
Available-for-sale, less than 12 months, gross unrealized losses | (251,450)
Available-for-sale, 12 months or more, estimated fair value | 1,603,080
Available-for-sale, 12 months or more, gross unrealized losses | (184,476)
Available-for-sale, total, estimated fair value | 5,690,610
Available-for-sale, total, gross unrealized losses | (435,926)
U.S. Government agencies |
Debt Securities, Available-for-sale [Line Items] |
Available-for-sale, less than 12 months, estimated fair value | 94,352
Available-for-sale, less than 12 months, gross unrealized losses | (4,576)
Available-for-sale, 12 months or more, estimated fair value | 211,178
Available-for-sale, 12 months or more, gross unrealized losses | (30,162)
Available-for-sale, total, estimated fair value | 305,530
Available-for-sale, total, gross unrealized losses | (34,738)
Mortgage-backed securities |
Debt Securities, Available-for-sale [Line Items] |
Available-for-sale, less than 12 months, estimated fair value | 2,377,428
Available-for-sale, less than 12 months, gross unrealized losses | (115,730)
Available-for-sale, 12 months or more, estimated fair value | 1,141,855
Available-for-sale, 12 months or more, gross unrealized losses | (96,789)
Available-for-sale, total, estimated fair value | 3,519,283
Available-for-sale, total, gross unrealized losses | (212,519)
State and political subdivisions |
Debt Securities, Available-for-sale [Line Items] |
Available-for-sale, less than 12 months, estimated fair value | 1,337,236
Available-for-sale, less than 12 months, gross unrealized losses | (118,017)
Available-for-sale, 12 months or more, estimated fair value | 152,722
Available-for-sale, 12 months or more, gross unrealized losses | (43,550)
Available-for-sale, total, estimated fair value | 1,489,958
Available-for-sale, total, gross unrealized losses | (161,567)
Other securities |
Debt Securities, Available-for-sale [Line Items] |
Available-for-sale, less than 12 months, estimated fair value | 278,514
Available-for-sale, less than 12 months, gross unrealized losses | (13,127)
Available-for-sale, 12 months or more, estimated fair value | 97,325
Available-for-sale, 12 months or more, gross unrealized losses | (13,975)
Available-for-sale, total, estimated fair value | 375,839
Available-for-sale, total, gross unrealized losses | $ (27,102)

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- Definition Amount of accumulated unrealized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for 12 months or longer, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27337-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=124269663&loc=SL82922890-210455 + Details
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