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Investment Securities - Securities With Unrealized Losses (Details) $ in Thousands | Dec. 31, 2023 USD ($)
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Available-for-sale |
Available-for-sale, less than 12 months, estimated fair value | $ 31,862
Available-for-sale, less than 12 months, gross unrealized losses | (2,991)
Available-for-sale, 12 months or more, estimated fair value | 3,084,495
Available-for-sale, 12 months or more, gross unrealized losses | (354,795)
Available-for-sale, total, estimated fair value | 3,116,357
Available-for-sale, total, gross unrealized losses | (357,786)
U.S. Treasury |
Available-for-sale |
Available-for-sale, less than 12 months, estimated fair value | 0
Available-for-sale, less than 12 months, gross unrealized losses | 0
Available-for-sale, 12 months or more, estimated fair value | 2,254
Available-for-sale, 12 months or more, gross unrealized losses | (31)
Available-for-sale, total, estimated fair value | 2,254
Available-for-sale, total, gross unrealized losses | (31)
U.S. Government agencies |
Available-for-sale |
Available-for-sale, less than 12 months, estimated fair value | 8,614
Available-for-sale, less than 12 months, gross unrealized losses | (39)
Available-for-sale, 12 months or more, estimated fair value | 59,732
Available-for-sale, 12 months or more, gross unrealized losses | (1,954)
Available-for-sale, total, estimated fair value | 68,346
Available-for-sale, total, gross unrealized losses | (1,993)
Mortgage-backed securities |
Available-for-sale |
Available-for-sale, less than 12 months, estimated fair value | 9,182
Available-for-sale, less than 12 months, gross unrealized losses | (135)
Available-for-sale, 12 months or more, estimated fair value | 1,930,105
Available-for-sale, 12 months or more, gross unrealized losses | (198,218)
Available-for-sale, total, estimated fair value | 1,939,287
Available-for-sale, total, gross unrealized losses | (198,353)
State and political subdivisions |
Available-for-sale |
Available-for-sale, less than 12 months, estimated fair value | 3,050
Available-for-sale, less than 12 months, gross unrealized losses | (163)
Available-for-sale, 12 months or more, estimated fair value | 869,379
Available-for-sale, 12 months or more, gross unrealized losses | (132,378)
Available-for-sale, total, estimated fair value | 872,429
Available-for-sale, total, gross unrealized losses | (132,541)
Other securities |
Available-for-sale |
Available-for-sale, less than 12 months, estimated fair value | 11,016
Available-for-sale, less than 12 months, gross unrealized losses | (2,654)
Available-for-sale, 12 months or more, estimated fair value | 223,025
Available-for-sale, 12 months or more, gross unrealized losses | (22,214)
Available-for-sale, total, estimated fair value | 234,041
Available-for-sale, total, gross unrealized losses | $ (24,868)

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