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Securities - Unrealized Losses on Held-to-Maturity Debt Securities (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Fair Value    
Less than 12 Months $ 280,917 $ 119,872
12 Months or Longer 0 0
Total 280,917 119,872
Unrealized Losses    
Less than 12 Months 22,607 2,389
12 Months or Longer 0 0
Total 22,607 2,389
U.S. Treasuries    
Fair Value    
Less than 12 Months 80,633 35,280
12 Months or Longer 0 0
Total 80,633 35,280
Unrealized Losses    
Less than 12 Months 6,002 600
12 Months or Longer 0 0
Total 6,002 600
Obligations of U.S. Government sponsored entities    
Fair Value    
Less than 12 Months 200,284 84,592
12 Months or Longer 0 0
Total 200,284 84,592
Unrealized Losses    
Less than 12 Months 16,605 1,789
12 Months or Longer 0 0
Total $ 16,605 $ 1,789