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Securities - Schedule of Unrealized Loss and Fair Value on Investments (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Fair Value    
Less Than 12 Months $ 463,620 $ 332,099
12 Months or Longer 35,605 73,338
Total 499,225 405,437
Unrealized Losses    
Less Than 12 Months (7,102) (1,530)
12 Months or Longer (148) (568)
Total (7,250) (2,098)
U.S. Treasury securities and obligations of U.S. government agencies    
Fair Value    
Less Than 12 Months 0 0
12 Months or Longer 253 256
Total 253 256
Unrealized Losses    
Less Than 12 Months 0 0
12 Months or Longer (2) (1)
Total (2) (1)
Mortgage-backed securities and collateralized mortgage obligations of U.S. government-sponsored entities    
Fair Value    
Less Than 12 Months 314,851 203,405
12 Months or Longer 4,888 569
Total 319,739 203,974
Unrealized Losses    
Less Than 12 Months (6,725) (1,218)
12 Months or Longer (49) (22)
Total (6,774) (1,240)
Private mortgage-backed securities and collateralized mortgage obligations    
Fair Value    
Less Than 12 Months 18,752 23,997
12 Months or Longer 2,029 0
Total 20,781 23,997
Unrealized Losses    
Less Than 12 Months (236) (210)
12 Months or Longer (25) 0
Total (261) (210)
Collateralized loan obligations    
Fair Value    
Less Than 12 Months 125,035 104,697
12 Months or Longer 28,435 72,513
Total 153,470 177,210
Unrealized Losses    
Less Than 12 Months (88) (102)
12 Months or Longer (72) (545)
Total (160) $ (647)
Obligations of state and political subdivisions    
Fair Value    
Less Than 12 Months 4,982  
12 Months or Longer 0  
Total 4,982  
Unrealized Losses    
Less Than 12 Months (53)  
12 Months or Longer 0  
Total $ (53)