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Investments in Securities - Unrealized Gain (Loss) on Investments (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Agency mortgage-backed securities    
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value $ 47,769 $ 10,279
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (388) (831)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 10,583  
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (356)  
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 58,352 10,279
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss (744) (831)
Agency collateralized mortgage obligations    
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 92,727 12,727
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (1,588) (375)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 16,298  
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (910)  
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 109,025 12,727
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss (2,498) (375)
States and political subdivisions securities    
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 6,537 1,164
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (43) (6)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 6,537 1,164
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss (43) (6)
Unrealized Losses and Estimated Fair Value    
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 147,033 24,170
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (2,019) (1,212)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 26,881  
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (1,266)  
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 173,914 24,170
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss $ (3,285) $ (1,212)