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Debt Securities Available for Sale - Continuous Unrealized Loss Position of Available-for-Sale Securities (Details) - USD ($)
$ in Thousands
Jun. 30, 2022
Dec. 31, 2021
Fair Value    
Less Than 12 Months $ 1,123,441 $ 864,455
12 Months or Longer 276,121 67,112
Total 1,399,562 931,567
Gross Unrealized (Losses)    
Less Than 12 Months (86,502) (12,799)
12 Months or Longer (38,695) (1,676)
Total (125,197) (14,475)
U.S. government and agency obligations    
Fair Value    
Less Than 12 Months 46,356 14,488
12 Months or Longer 4,552 0
Total 50,908 14,488
Gross Unrealized (Losses)    
Less Than 12 Months (1,135) (236)
12 Months or Longer (434) 0
Total (1,569) (236)
Mortgage-backed securities and collateralized mortgage obligations    
Fair Value    
Less Than 12 Months 995,720 820,746
12 Months or Longer 266,919 62,407
Total 1,262,639 883,153
Gross Unrealized (Losses)    
Less Than 12 Months (79,434) (11,892)
12 Months or Longer (37,911) (1,381)
Total (117,345) (13,273)
Municipal obligations    
Fair Value    
Less Than 12 Months 4,031  
12 Months or Longer 0  
Total 4,031  
Gross Unrealized (Losses)    
Less Than 12 Months (123)  
12 Months or Longer 0  
Total (123)  
Corporate debt securities    
Fair Value    
Less Than 12 Months 77,334 29,221
12 Months or Longer 4,650 4,705
Total 81,984 33,926
Gross Unrealized (Losses)    
Less Than 12 Months (5,810) (671)
12 Months or Longer (350) (295)
Total $ (6,160) $ (966)