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Securities - Fair Value and Age of Gross Unrealized Losses of Debt Securities (Details) $ in Thousands | Mar. 31, 2022 USD ($) security | Dec. 31, 2021 USD ($) security
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Debt Securities, Available-for-sale [Line Items] |  |
Number of Securities, Less Than 12 Months | security | 91 | 30
Fair Value, Less Than 12 Months | $ 727,845 | $ 372,499
Unrealized Losses, Less Than 12 Months | $ (32,878) | $ (5,393)
Number of Securities, 12 Months or More | security | 6 | 1
Fair Value, 12 Months or More | $ 76,343 | $ 8,933
Unrealized Losses, 12 Months or More | $ (7,617) | $ (374)
Number of Securities, Total | security | 97 | 31
Fair Value, Total | $ 804,188 | $ 381,432
Unrealized Losses, Total | $ (40,495) | $ (5,767)
U.S. Treasury securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Number of Securities, Less Than 12 Months | security | 12 | 8
Fair Value, Less Than 12 Months | $ 119,959 | $ 85,221
Unrealized Losses, Less Than 12 Months | $ (6,742) | $ (742)
Number of Securities, 12 Months or More | security | 0 | 0
Fair Value, 12 Months or More | $ 0 | $ 0
Unrealized Losses, 12 Months or More | $ 0 | $ 0
Number of Securities, Total | security | 12 | 8
Fair Value, Total | $ 119,959 | $ 85,221
Unrealized Losses, Total | $ (6,742) | $ (742)
Obligations of U.S. government corporations and agencies |  |
Debt Securities, Available-for-sale [Line Items] |  |
Number of Securities, Less Than 12 Months | security | 2 | 0
Fair Value, Less Than 12 Months | $ 15,296 | $ 0
Unrealized Losses, Less Than 12 Months | $ (256) | $ 0
Number of Securities, 12 Months or More | security | 0 | 0
Fair Value, 12 Months or More | $ 0 | $ 0
Unrealized Losses, 12 Months or More | $ 0 | $ 0
Number of Securities, Total | security | 2 | 0
Fair Value, Total | $ 15,296 | $ 0
Unrealized Losses, Total | $ (256) | $ 0
Collateralized mortgage obligations of U.S. government corporations and agencies |  |
Debt Securities, Available-for-sale [Line Items] |  |
Number of Securities, Less Than 12 Months | security | 39 | 12
Fair Value, Less Than 12 Months | $ 309,426 | $ 141,204
Unrealized Losses, Less Than 12 Months | $ (15,367) | $ (2,436)
Number of Securities, 12 Months or More | security | 4 | 1
Fair Value, 12 Months or More | $ 36,986 | $ 8,933
Unrealized Losses, 12 Months or More | $ (3,836) | $ (374)
Number of Securities, Total | security | 43 | 13
Fair Value, Total | $ 346,412 | $ 150,137
Unrealized Losses, Total | $ (19,203) | $ (2,810)
Residential mortgage-backed securities of U.S. government corporations and agencies |  |
Debt Securities, Available-for-sale [Line Items] |  |
Number of Securities, Less Than 12 Months | security | 9 | 3
Fair Value, Less Than 12 Months | $ 8,171 | $ 46,042
Unrealized Losses, Less Than 12 Months | $ (269) | $ (628)
Number of Securities, 12 Months or More | security | 2 | 0
Fair Value, 12 Months or More | $ 39,357 | $ 0
Unrealized Losses, 12 Months or More | $ (3,781) | $ 0
Number of Securities, Total | security | 11 | 3
Fair Value, Total | $ 47,528 | $ 46,042
Unrealized Losses, Total | $ (4,050) | $ (628)
Commercial mortgage-backed securities of U.S. government corporations and agencies |  |
Debt Securities, Available-for-sale [Line Items] |  |
Number of Securities, Less Than 12 Months | security | 29 | 7
Fair Value, Less Than 12 Months | $ 274,993 | $ 100,032
Unrealized Losses, Less Than 12 Months | $ (10,244) | $ (1,587)
Number of Securities, 12 Months or More | security | 0 | 0
Fair Value, 12 Months or More | $ 0 | $ 0
Unrealized Losses, 12 Months or More | $ 0 | $ 0
Number of Securities, Total | security | 29 | 7
Fair Value, Total | $ 274,993 | $ 100,032
Unrealized Losses, Total | $ (10,244) | $ (1,587)
Corporate bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Number of Securities, Less Than 12 Months | security | 0 | 0
Fair Value, Less Than 12 Months | $ 0 | $ 0
Unrealized Losses, Less Than 12 Months | $ 0 | $ 0
Number of Securities, 12 Months or More | security | 0 | 0
Fair Value, 12 Months or More | $ 0 | $ 0
Unrealized Losses, 12 Months or More | $ 0 | $ 0
Number of Securities, Total | security | 0 | 0
Fair Value, Total | $ 0 | $ 0
Unrealized Losses, Total | $ 0 | $ 0
Obligations of states and political subdivisions |  |
Debt Securities, Available-for-sale [Line Items] |  |
Number of Securities, Less Than 12 Months | security | 0 | 0
Fair Value, Less Than 12 Months | $ 0 | $ 0
Unrealized Losses, Less Than 12 Months | $ 0 | $ 0
Number of Securities, 12 Months or More | security | 0 | 0
Fair Value, 12 Months or More | $ 0 | $ 0
Unrealized Losses, 12 Months or More | $ 0 | $ 0
Number of Securities, Total | security | 0 | 0
Fair Value, Total | $ 0 | $ 0
Unrealized Losses, Total | $ 0 | $ 0

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