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Securities - Fair Value and Age of Gross Unrealized Losses of Debt Securities (Details) $ in Thousands | Sep. 30, 2021 USD ($) security | Dec. 31, 2020 USD ($) security
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Debt Securities, Available-for-sale [Line Items] |  |
Number of Securities, Less Than 12 Months | security | 22 | 3
Fair Value, Less Than 12 Months | $ 286,466 | $ 36,196
Unrealized Losses, Less Than 12 Months | $ (3,070) | $ (90)
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 | 22 | 3
Fair Value, Total | $ 286,466 | $ 36,196
Unrealized Losses, Total | $ (3,070) | $ (90)
U.S. Treasury securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Number of Securities, Less Than 12 Months | security | 4 | 0
Fair Value, Less Than 12 Months | $ 43,200 | $ 0
Unrealized Losses, Less Than 12 Months | $ (248) | $ 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 | 4 | 0
Fair Value, Total | $ 43,200 | $ 0
Unrealized Losses, Total | $ (248) | $ 0
Obligations of U.S. government corporations and agencies |  |
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
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 | 7 | 2
Fair Value, Less Than 12 Months | $ 88,290 | $ 35,697
Unrealized Losses, Less Than 12 Months | $ (1,198) | $ (89)
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 | 7 | 2
Fair Value, Total | $ 88,290 | $ 35,697
Unrealized Losses, Total | $ (1,198) | $ (89)
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 | 3 | 0
Fair Value, Less Than 12 Months | $ 48,497 | $ 0
Unrealized Losses, Less Than 12 Months | $ (966) | $ 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 | 3 | 0
Fair Value, Total | $ 48,497 | $ 0
Unrealized Losses, Total | $ (966) | $ 0
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 | 7 | 0
Fair Value, Less Than 12 Months | $ 101,479 | $ 0
Unrealized Losses, Less Than 12 Months | $ (658) | $ 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 | 7 | 0
Fair Value, Total | $ 101,479 | $ 0
Unrealized Losses, Total | $ (658) | $ 0
Corporate bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Number of Securities, Less Than 12 Months | security | 0 | 1
Fair Value, Less Than 12 Months | $ 0 | $ 499
Unrealized Losses, Less Than 12 Months | $ 0 | $ (1)
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 | 1
Fair Value, Total | $ 0 | $ 499
Unrealized Losses, Total | $ 0 | $ (1)
Obligations of states and political subdivisions |  |
Debt Securities, Available-for-sale [Line Items] |  |
Number of Securities, Less Than 12 Months | security | 1 | 0
Fair Value, Less Than 12 Months | $ 5,000 | $ 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 | 1 | 0
Fair Value, Total | $ 5,000 | $ 0
Unrealized Losses, Total | $ 0 | $ 0

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