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Investment Securities - Securities With Unrealized Losses (Details) $ in Thousands | Dec. 31, 2022 USD ($)
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Available-for-sale |
Available-for-sale, less than 12 months, estimated fair value | $ 1,081,117
Available-for-sale, less than 12 months, gross unrealized losses | (66,901)
Available-for-sale, 12 months or more, estimated fair value | 2,715,164
Available-for-sale, 12 months or more, gross unrealized losses | (412,031)
Available-for-sale, total, estimated fair value | 3,796,281
Available-for-sale, total, gross unrealized losses | (478,932)
U.S. Treasury |
Available-for-sale |
Available-for-sale, less than 12 months, estimated fair value | 2,197
Available-for-sale, less than 12 months, gross unrealized losses | (60)
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 | 2,197
Available-for-sale, total, gross unrealized losses | (60)
U.S. Government agencies |
Available-for-sale |
Available-for-sale, less than 12 months, estimated fair value | 101,138
Available-for-sale, less than 12 months, gross unrealized losses | (3,263)
Available-for-sale, 12 months or more, estimated fair value | 66,970
Available-for-sale, 12 months or more, gross unrealized losses | (4,059)
Available-for-sale, total, estimated fair value | 168,108
Available-for-sale, total, gross unrealized losses | (7,322)
Mortgage-backed securities |
Available-for-sale |
Available-for-sale, less than 12 months, estimated fair value | 653,288
Available-for-sale, less than 12 months, gross unrealized losses | (27,437)
Available-for-sale, 12 months or more, estimated fair value | 1,880,277
Available-for-sale, 12 months or more, gross unrealized losses | (239,000)
Available-for-sale, total, estimated fair value | 2,533,565
Available-for-sale, total, gross unrealized losses | (266,437)
State and political subdivisions |
Available-for-sale |
Available-for-sale, less than 12 months, estimated fair value | 147,989
Available-for-sale, less than 12 months, gross unrealized losses | (24,740)
Available-for-sale, 12 months or more, estimated fair value | 692,478
Available-for-sale, 12 months or more, gross unrealized losses | (160,560)
Available-for-sale, total, estimated fair value | 840,467
Available-for-sale, total, gross unrealized losses | (185,300)
Other securities |
Available-for-sale |
Available-for-sale, less than 12 months, estimated fair value | 176,505
Available-for-sale, less than 12 months, gross unrealized losses | (11,401)
Available-for-sale, 12 months or more, estimated fair value | 75,439
Available-for-sale, 12 months or more, gross unrealized losses | (8,412)
Available-for-sale, total, estimated fair value | 251,944
Available-for-sale, total, gross unrealized losses | $ (19,813)

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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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