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Investment Securities - Securities With Unrealized Losses (Details) $ in Thousands | Mar. 31, 2020 USD ($)
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Debt Securities, Available-for-sale [Line Items] |
Available-for-sale, less than 12 months, estimated fair value | $ 507,520
Available-for-sale, less than 12 months, gross unrealized losses | (2,518)
Available-for-sale, 12 months or more, estimated fair value | 133,004
Available-for-sale, 12 months or more, gross unrealized losses | (2,686)
Available-for-sale, total, estimated fair value | 640,524
Available-for-sale, total, gross unrealized losses | (5,204)
U.S. Treasury |
Debt Securities, Available-for-sale [Line Items] |
Available-for-sale, less than 12 months, estimated fair value | 424,989
Available-for-sale, less than 12 months, gross unrealized losses | (43)
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 | 424,989
Available-for-sale, total, gross unrealized losses | (43)
U.S. Government agencies |
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 | 58,056
Available-for-sale, 12 months or more, gross unrealized losses | (891)
Available-for-sale, total, estimated fair value | 58,056
Available-for-sale, total, gross unrealized losses | (891)
Mortgage-backed securities |
Debt Securities, Available-for-sale [Line Items] |
Available-for-sale, less than 12 months, estimated fair value | 57,718
Available-for-sale, less than 12 months, gross unrealized losses | (1,318)
Available-for-sale, 12 months or more, estimated fair value | 74,523
Available-for-sale, 12 months or more, gross unrealized losses | (1,791)
Available-for-sale, total, estimated fair value | 132,241
Available-for-sale, total, gross unrealized losses | (3,109)
State and political subdivisions |
Debt Securities, Available-for-sale [Line Items] |
Available-for-sale, less than 12 months, estimated fair value | 24,813
Available-for-sale, less than 12 months, gross unrealized losses | (1,157)
Available-for-sale, 12 months or more, estimated fair value | 425
Available-for-sale, 12 months or more, gross unrealized losses | (4)
Available-for-sale, total, estimated fair value | 25,238
Available-for-sale, total, gross unrealized losses | $ (1,161)

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