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Investment Securities - Securities With Unrealized Losses (Details) $ in Thousands | Mar. 31, 2023 USD ($)
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Debt Securities, Available-for-sale [Line Items] |
Available-for-sale, less than 12 months, estimated fair value | $ 661,971
Available-for-sale, less than 12 months, gross unrealized losses | (20,920)
Available-for-sale, 12 months or more, estimated fair value | 3,020,877
Available-for-sale, 12 months or more, gross unrealized losses | (398,337)
Available-for-sale, total, estimated fair value | 3,682,848
Available-for-sale, total, gross unrealized losses | (419,257)
U.S. Treasury |
Debt Securities, Available-for-sale [Line Items] |
Available-for-sale, less than 12 months, estimated fair value | 2,220
Available-for-sale, less than 12 months, gross unrealized losses | (44)
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 | 2,220
Available-for-sale, total, gross unrealized losses | (44)
U.S. Government agencies |
Debt Securities, Available-for-sale [Line Items] |
Available-for-sale, less than 12 months, estimated fair value | 85,993
Available-for-sale, less than 12 months, gross unrealized losses | (2,409)
Available-for-sale, 12 months or more, estimated fair value | 80,154
Available-for-sale, 12 months or more, gross unrealized losses | (3,962)
Available-for-sale, total, estimated fair value | 166,147
Available-for-sale, total, gross unrealized losses | (6,371)
Mortgage-backed securities |
Debt Securities, Available-for-sale [Line Items] |
Available-for-sale, less than 12 months, estimated fair value | 442,923
Available-for-sale, less than 12 months, gross unrealized losses | (7,396)
Available-for-sale, 12 months or more, estimated fair value | 1,980,733
Available-for-sale, 12 months or more, gross unrealized losses | (223,846)
Available-for-sale, total, estimated fair value | 2,423,656
Available-for-sale, total, gross unrealized losses | (231,242)
State and political subdivisions |
Debt Securities, Available-for-sale [Line Items] |
Available-for-sale, less than 12 months, estimated fair value | 47,760
Available-for-sale, less than 12 months, gross unrealized losses | (2,572)
Available-for-sale, 12 months or more, estimated fair value | 813,859
Available-for-sale, 12 months or more, gross unrealized losses | (162,002)
Available-for-sale, total, estimated fair value | 861,619
Available-for-sale, total, gross unrealized losses | (164,574)
Other securities |
Debt Securities, Available-for-sale [Line Items] |
Available-for-sale, less than 12 months, estimated fair value | 83,075
Available-for-sale, less than 12 months, gross unrealized losses | (8,499)
Available-for-sale, 12 months or more, estimated fair value | 146,131
Available-for-sale, 12 months or more, gross unrealized losses | (8,527)
Available-for-sale, total, estimated fair value | 229,206
Available-for-sale, total, gross unrealized losses | $ (17,026)

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