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Investment Securities - Securities With Unrealized Losses (Details) $ in Thousands | Jun. 30, 2023 USD ($)
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Debt Securities, Available-for-sale [Line Items] |
Available-for-sale, less than 12 months, estimated fair value | $ 91,580
Available-for-sale, less than 12 months, gross unrealized losses | (7,841)
Available-for-sale, 12 months or more, estimated fair value | 3,440,690
Available-for-sale, 12 months or more, gross unrealized losses | (420,113)
Available-for-sale, total, estimated fair value | 3,532,270
Available-for-sale, total, gross unrealized losses | (427,954)
U.S. Treasury |
Debt Securities, Available-for-sale [Line Items] |
Available-for-sale, less than 12 months, estimated fair value | 776
Available-for-sale, less than 12 months, gross unrealized losses | (21)
Available-for-sale, 12 months or more, estimated fair value | 1,433
Available-for-sale, 12 months or more, gross unrealized losses | (41)
Available-for-sale, total, estimated fair value | 2,209
Available-for-sale, total, gross unrealized losses | (62)
U.S. Government agencies |
Debt Securities, Available-for-sale [Line Items] |
Available-for-sale, less than 12 months, estimated fair value | 22,246
Available-for-sale, less than 12 months, gross unrealized losses | (95)
Available-for-sale, 12 months or more, estimated fair value | 149,445
Available-for-sale, 12 months or more, gross unrealized losses | (7,127)
Available-for-sale, total, estimated fair value | 171,691
Available-for-sale, total, gross unrealized losses | (7,222)
Mortgage-backed securities |
Debt Securities, Available-for-sale [Line Items] |
Available-for-sale, less than 12 months, estimated fair value | 2,707
Available-for-sale, less than 12 months, gross unrealized losses | (85)
Available-for-sale, 12 months or more, estimated fair value | 2,270,299
Available-for-sale, 12 months or more, gross unrealized losses | (249,825)
Available-for-sale, total, estimated fair value | 2,273,006
Available-for-sale, total, gross unrealized losses | (249,910)
State and political subdivisions |
Debt Securities, Available-for-sale [Line Items] |
Available-for-sale, less than 12 months, estimated fair value | 17,045
Available-for-sale, less than 12 months, gross unrealized losses | (379)
Available-for-sale, 12 months or more, estimated fair value | 846,298
Available-for-sale, 12 months or more, gross unrealized losses | (143,464)
Available-for-sale, total, estimated fair value | 863,343
Available-for-sale, total, gross unrealized losses | (143,843)
Other securities |
Debt Securities, Available-for-sale [Line Items] |
Available-for-sale, less than 12 months, estimated fair value | 48,806
Available-for-sale, less than 12 months, gross unrealized losses | (7,261)
Available-for-sale, 12 months or more, estimated fair value | 173,215
Available-for-sale, 12 months or more, gross unrealized losses | (19,656)
Available-for-sale, total, estimated fair value | 222,021
Available-for-sale, total, gross unrealized losses | $ (26,917)

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