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Investment Securities - Unrealized Losses (Details) - USD ($)
$ in Thousands
Sep. 30, 2022
Dec. 31, 2021
Fair Value    
Less than 12 Months $ 1,148,864 $ 334,687
12 Months or Longer 181,229 32,267
Total 1,330,093 366,954
Unrealized Losses    
Less than 12 Months (94,682) (4,435)
12 Months or Longer (40,721) (403)
Total (135,403) (4,838)
US Treasury and Government [Member]    
Fair Value    
Less than 12 Months 58,025 14,828
12 Months or Longer 5,724 0
Total 63,749 14,828
Unrealized Losses    
Less than 12 Months (4,176) (176)
12 Months or Longer (987) 0
Total (5,163) (176)
Municipal securities    
Fair Value    
Less than 12 Months 148,054 29,774
12 Months or Longer 27,731 9,351
Total 175,785 39,125
Unrealized Losses    
Less than 12 Months (12,031) (619)
12 Months or Longer (9,074) (235)
Total (21,105) (854)
Residential CMO and MBS    
Fair Value    
Less than 12 Months 308,142 204,039
12 Months or Longer 128,304 19,862
Total 436,446 223,901
Unrealized Losses    
Less than 12 Months (28,668) (2,470)
12 Months or Longer (27,298) (123)
Total (55,966) (2,593)
Commercial CMO and MBS    
Fair Value    
Less than 12 Months 611,399 83,283
12 Months or Longer 18,636 1,936
Total 630,035 85,219
Unrealized Losses    
Less than 12 Months (49,077) (1,161)
12 Months or Longer (3,347) (38)
Total (52,424) (1,199)
Corporate Debt Securities [Member]    
Fair Value    
Less than 12 Months 5,834  
12 Months or Longer 0  
Total 5,834  
Unrealized Losses    
Less than 12 Months (167)  
12 Months or Longer 0  
Total (167)  
Other asset-backed securities    
Fair Value    
Less than 12 Months 17,410 2,763
12 Months or Longer 834 1,118
Total 18,244 3,881
Unrealized Losses    
Less than 12 Months (563) (9)
12 Months or Longer (15) (7)
Total $ (578) $ (16)