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Debt Securities Available for Sale - Continuous Unrealized Loss Position of Available-for-Sale Securities (Details) - USD ($)
$ in Thousands
Sep. 30, 2022
Dec. 31, 2021
Fair Value    
Less Than 12 Months $ 824,671 $ 864,455
12 Months or Longer 522,105 67,112
Total 1,346,776 931,567
Gross Unrealized (Losses)    
Less Than 12 Months (81,699) (12,799)
12 Months or Longer (105,859) (1,676)
Total (187,558) (14,475)
U.S. government and agency obligations    
Fair Value    
Less Than 12 Months 54,464 14,488
12 Months or Longer 8,817 0
Total 63,281 14,488
Gross Unrealized (Losses)    
Less Than 12 Months (3,104) (236)
12 Months or Longer (1,106) 0
Total (4,210) (236)
Mortgage-backed securities and collateralized mortgage obligations    
Fair Value    
Less Than 12 Months 696,364 820,746
12 Months or Longer 504,328 62,407
Total 1,200,692 883,153
Gross Unrealized (Losses)    
Less Than 12 Months (72,154) (11,892)
12 Months or Longer (103,713) (1,381)
Total (175,867) (13,273)
Municipal obligations    
Fair Value    
Less Than 12 Months 3,557  
12 Months or Longer 0  
Total 3,557  
Gross Unrealized (Losses)    
Less Than 12 Months (141)  
12 Months or Longer 0  
Total (141)  
Corporate debt securities    
Fair Value    
Less Than 12 Months 70,286 29,221
12 Months or Longer 8,960 4,705
Total 79,246 33,926
Gross Unrealized (Losses)    
Less Than 12 Months (6,300) (671)
12 Months or Longer (1,040) (295)
Total $ (7,340) $ (966)