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Investment Securities - Securities With Unrealized Losses (Details) $ in Thousands | Mar. 31, 2024 USD ($)
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Debt Securities, Available-for-sale [Line Items] |
Available-for-sale, less than 12 months, estimated fair value | $ 43,033
Available-for-sale, less than 12 months, gross unrealized losses | (579)
Available-for-sale, 12 months or more, estimated fair value | 2,930,580
Available-for-sale, 12 months or more, gross unrealized losses | (367,066)
Available-for-sale, total, estimated fair value | 2,973,613
Available-for-sale, total, gross unrealized losses | (367,645)
U.S. Treasury |
Debt Securities, Available-for-sale [Line Items] |
Available-for-sale, less than 12 months, estimated fair value | 1,964
Available-for-sale, less than 12 months, gross unrealized losses | (26)
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 | 1,964
Available-for-sale, total, gross unrealized losses | (26)
U.S. Government agencies |
Debt Securities, Available-for-sale [Line Items] |
Available-for-sale, less than 12 months, estimated fair value | 15,965
Available-for-sale, less than 12 months, gross unrealized losses | (181)
Available-for-sale, 12 months or more, estimated fair value | 49,809
Available-for-sale, 12 months or more, gross unrealized losses | (1,814)
Available-for-sale, total, estimated fair value | 65,774
Available-for-sale, total, gross unrealized losses | (1,995)
Mortgage-backed securities |
Debt Securities, Available-for-sale [Line Items] |
Available-for-sale, less than 12 months, estimated fair value | 10,842
Available-for-sale, less than 12 months, gross unrealized losses | (293)
Available-for-sale, 12 months or more, estimated fair value | 1,833,560
Available-for-sale, 12 months or more, gross unrealized losses | (203,241)
Available-for-sale, total, estimated fair value | 1,844,402
Available-for-sale, total, gross unrealized losses | (203,534)
State and political subdivisions |
Debt Securities, Available-for-sale [Line Items] |
Available-for-sale, less than 12 months, estimated fair value | 14,262
Available-for-sale, less than 12 months, gross unrealized losses | (79)
Available-for-sale, 12 months or more, estimated fair value | 845,801
Available-for-sale, 12 months or more, gross unrealized losses | (138,404)
Available-for-sale, total, estimated fair value | 860,063
Available-for-sale, total, gross unrealized losses | (138,483)
Other securities |
Debt Securities, Available-for-sale [Line Items] |
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 | 201,410
Available-for-sale, 12 months or more, gross unrealized losses | (23,607)
Available-for-sale, total, estimated fair value | 201,410
Available-for-sale, total, gross unrealized losses | $ (23,607)

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