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Investment Securities - Unrealized Losses (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Fair Value    
Less than 12 Months $ 756,153 $ 334,687
12 Months or Longer 45,842 32,267
Total 801,995 366,954
Unrealized Losses    
Less than 12 Months (44,251) (4,435)
12 Months or Longer (3,731) (403)
Total (47,982) (4,838)
U.S. government and agency securities    
Fair Value    
Less than 12 Months 38,002 14,828
12 Months or Longer 1,553 0
Total 39,555 14,828
Unrealized Losses    
Less than 12 Months (1,764) (176)
12 Months or Longer (170) 0
Total (1,934) (176)
Municipal securities    
Fair Value    
Less than 12 Months 90,266 29,774
12 Months or Longer 16,837 9,351
Total 107,103 39,125
Unrealized Losses    
Less than 12 Months (5,206) (619)
12 Months or Longer (2,007) (235)
Total (7,213) (854)
Residential CMO and MBS    
Fair Value    
Less than 12 Months 307,811 204,039
12 Months or Longer 24,731 19,862
Total 332,542 223,901
Unrealized Losses    
Less than 12 Months (19,312) (2,470)
12 Months or Longer (1,432) (123)
Total (20,744) (2,593)
Commercial CMO and MBS    
Fair Value    
Less than 12 Months 307,598 83,283
12 Months or Longer 1,717 1,936
Total 309,315 85,219
Unrealized Losses    
Less than 12 Months (17,695) (1,161)
12 Months or Longer (111) (38)
Total (17,806) (1,199)
Other asset-backed securities    
Fair Value    
Less than 12 Months 12,476 2,763
12 Months or Longer 1,004 1,118
Total 13,480 3,881
Unrealized Losses    
Less than 12 Months (274) (9)
12 Months or Longer (11) (7)
Total $ (285) $ (16)