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Investment Securities - Securities With Unrealized Losses (Details) $ in Thousands | Dec. 31, 2021 USD ($)
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Available-for-sale |
Available-for-sale debt securities, less than 12 months, estimated fair value | $ 4,544,559
Available-for-sale debt securities, less than 12 months, gross unrealized losses | (42,797)
Available-for-sale debt securities, 12 months or more, estimated fair value | 521,145
Available-for-sale debt securities, 12 months or more, gross unrealized losses | (18,524)
Available-for-sale debt securities, estimated fair value | 5,065,704
Available-for-sale debt securities, gross unrealized losses | (61,321)
U.S. Government agencies |
Available-for-sale |
Available-for-sale debt securities, less than 12 months, estimated fair value | 152,908
Available-for-sale debt securities, less than 12 months, gross unrealized losses | (3,297)
Available-for-sale debt securities, 12 months or more, estimated fair value | 160,913
Available-for-sale debt securities, 12 months or more, gross unrealized losses | (7,311)
Available-for-sale debt securities, estimated fair value | 313,821
Available-for-sale debt securities, gross unrealized losses | (10,608)
Mortgage-backed securities |
Available-for-sale |
Available-for-sale debt securities, less than 12 months, estimated fair value | 3,632,822
Available-for-sale debt securities, less than 12 months, gross unrealized losses | (33,551)
Available-for-sale debt securities, 12 months or more, estimated fair value | 323,683
Available-for-sale debt securities, 12 months or more, gross unrealized losses | (9,688)
Available-for-sale debt securities, estimated fair value | 3,956,505
Available-for-sale debt securities, gross unrealized losses | (43,239)
State and political subdivisions |
Available-for-sale |
Available-for-sale debt securities, less than 12 months, estimated fair value | 530,647
Available-for-sale debt securities, less than 12 months, gross unrealized losses | (709)
Available-for-sale debt securities, 12 months or more, estimated fair value | 29,565
Available-for-sale debt securities, 12 months or more, gross unrealized losses | (1,286)
Available-for-sale debt securities, estimated fair value | 560,212
Available-for-sale debt securities, gross unrealized losses | (1,995)
Other securities |
Available-for-sale |
Available-for-sale debt securities, less than 12 months, estimated fair value | 228,182
Available-for-sale debt securities, less than 12 months, gross unrealized losses | (5,240)
Available-for-sale debt securities, 12 months or more, estimated fair value | 6,984
Available-for-sale debt securities, 12 months or more, gross unrealized losses | (239)
Available-for-sale debt securities, estimated fair value | 235,166
Available-for-sale debt securities, gross unrealized losses | $ (5,479)

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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 http://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 http://asc.fasb.org/extlink&oid=123581744&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 http://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 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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