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Debt Securities Available for Sale - Continuous Unrealized Loss Position of Available-for-Sale Securities (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Fair Value    
Less Than 12 Months $ 1,097,123 $ 864,455
12 Months or Longer 274,629 67,112
Total 1,371,752 931,567
Gross Unrealized (Losses)    
Less Than 12 Months (56,287) (12,799)
12 Months or Longer (24,422) (1,676)
Total (80,709) (14,475)
U.S. government and agency obligations    
Fair Value    
Less Than 12 Months 22,400 14,488
12 Months or Longer 4,613 0
Total 27,013 14,488
Gross Unrealized (Losses)    
Less Than 12 Months (806) (236)
12 Months or Longer (372) 0
Total (1,178) (236)
Mortgage-backed securities and collateralized mortgage obligations    
Fair Value    
Less Than 12 Months 1,010,976 820,746
12 Months or Longer 265,384 62,407
Total 1,276,360 883,153
Gross Unrealized (Losses)    
Less Than 12 Months (52,254) (11,892)
12 Months or Longer (23,727) (1,381)
Total (75,981) (13,273)
Municipal obligations    
Fair Value    
Less Than 12 Months 452  
12 Months or Longer 0  
Total 452  
Gross Unrealized (Losses)    
Less Than 12 Months (5)  
12 Months or Longer 0  
Total (5)  
Corporate debt securities    
Fair Value    
Less Than 12 Months 63,295 29,221
12 Months or Longer 4,632 4,705
Total 67,927 33,926
Gross Unrealized (Losses)    
Less Than 12 Months (3,222) (671)
12 Months or Longer (323) (295)
Total $ (3,545) $ (966)