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Investment Securities - Securities With Unrealized Losses (Details) $ in Thousands | Sep. 30, 2022 USD ($)
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Debt Securities, Available-for-sale [Line Items] |
Available-for-sale, less than 12 months, estimated fair value | $ 1,983,590
Available-for-sale, less than 12 months, gross unrealized losses | (172,554)
Available-for-sale, 12 months or more, estimated fair value | 1,895,108
Available-for-sale, 12 months or more, gross unrealized losses | (374,429)
Available-for-sale, total, estimated fair value | 3,878,698
Available-for-sale, total, gross unrealized losses | (546,983)
U.S. Treasury |
Debt Securities, Available-for-sale [Line Items] |
Available-for-sale, less than 12 months, estimated fair value | 2,191
Available-for-sale, less than 12 months, gross unrealized losses | (59)
Available-for-sale, 12 months or more, estimated fair value | 0
Available-for-sale, 12 months or more, gross unrealized losses | 0
Available-for-sale, total, estimated fair value | 2,191
Available-for-sale, total, gross unrealized losses | (59)
U.S. Government agencies |
Debt Securities, Available-for-sale [Line Items] |
Available-for-sale, less than 12 months, estimated fair value | 116,968
Available-for-sale, less than 12 months, gross unrealized losses | (5,120)
Available-for-sale, 12 months or more, estimated fair value | 53,942
Available-for-sale, 12 months or more, gross unrealized losses | (2,334)
Available-for-sale, total, estimated fair value | 170,910
Available-for-sale, total, gross unrealized losses | (7,454)
Mortgage-backed securities |
Debt Securities, Available-for-sale [Line Items] |
Available-for-sale, less than 12 months, estimated fair value | 1,115,220
Available-for-sale, less than 12 months, gross unrealized losses | (73,690)
Available-for-sale, 12 months or more, estimated fair value | 1,545,776
Available-for-sale, 12 months or more, gross unrealized losses | (215,849)
Available-for-sale, total, estimated fair value | 2,660,996
Available-for-sale, total, gross unrealized losses | (289,539)
State and political subdivisions |
Debt Securities, Available-for-sale [Line Items] |
Available-for-sale, less than 12 months, estimated fair value | 536,510
Available-for-sale, less than 12 months, gross unrealized losses | (79,426)
Available-for-sale, 12 months or more, estimated fair value | 259,147
Available-for-sale, 12 months or more, gross unrealized losses | (152,665)
Available-for-sale, total, estimated fair value | 795,657
Available-for-sale, total, gross unrealized losses | (232,091)
Other securities |
Debt Securities, Available-for-sale [Line Items] |
Available-for-sale, less than 12 months, estimated fair value | 212,701
Available-for-sale, less than 12 months, gross unrealized losses | (14,259)
Available-for-sale, 12 months or more, estimated fair value | 36,243
Available-for-sale, 12 months or more, gross unrealized losses | (3,581)
Available-for-sale, total, estimated fair value | 248,944
Available-for-sale, total, gross unrealized losses | $ (17,840)

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- Definition Amount of 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 more than 12 months, 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 326 -SubTopic 30 -Section 50 -Paragraph 5 -URI https://asc.fasb.org/extlink&oid=124269663&loc=SL82922890-210455 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27337-111563 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 55 -Paragraph 8 -URI https://asc.fasb.org/extlink&oid=121590138&loc=SL82922954-210456 + Details
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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 https://asc.fasb.org/extlink&oid=126970911&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 https://asc.fasb.org/extlink&oid=124269663&loc=SL82922890-210455 + Details
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