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Investment Securities - Schedule of AFS Debt Securities in an Unrealized Loss Position (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Schedule Of Available For Sale Securities [Line Items]    
Less Than 12 Months, Fair Value $ 2,687,057 $ 318,953
Less Than 12 Months, Gross Unrealized Losses (39,069) (1,499)
12 Months or Longer, Fair Value 150,063 165,159
12 Months or Longer, Gross Unrealized Losses (3,780) (876)
Total Fair Value 2,837,120 484,112
Total Gross Unrealized Losses (42,849) (2,375)
Debt Securities Issued by the U.S. Treasury and Government Agencies    
Schedule Of Available For Sale Securities [Line Items]    
Less Than 12 Months, Fair Value 1,772 21,338
Less Than 12 Months, Gross Unrealized Losses (4) (42)
12 Months or Longer, Fair Value 10,458 87,070
12 Months or Longer, Gross Unrealized Losses (102) (549)
Total Fair Value 12,230 108,408
Total Gross Unrealized Losses (106) (591)
Debt Securities Issued by States and Political Subdivisions    
Schedule Of Available For Sale Securities [Line Items]    
Less Than 12 Months, Fair Value 413  
Less Than 12 Months, Gross Unrealized Losses (2)  
12 Months or Longer, Fair Value   26
12 Months or Longer, Gross Unrealized Losses   (1)
Total Fair Value 413 26
Total Gross Unrealized Losses (2) (1)
Debt Securities Issued by Government-Sponsored Enterprises    
Schedule Of Available For Sale Securities [Line Items]    
Less Than 12 Months, Fair Value 99  
Less Than 12 Months, Gross Unrealized Losses (1)  
Total Fair Value 99  
Total Gross Unrealized Losses (1)  
Debt Securities Issued by Corporations    
Schedule Of Available For Sale Securities [Line Items]    
Less Than 12 Months, Fair Value 123,230 65,000
Less Than 12 Months, Gross Unrealized Losses (734) (853)
12 Months or Longer, Fair Value 64,190 50,000
12 Months or Longer, Gross Unrealized Losses (809) (103)
Total Fair Value 187,420 115,000
Total Gross Unrealized Losses (1,543) (956)
Residential - Government Agencies    
Schedule Of Available For Sale Securities [Line Items]    
Less Than 12 Months, Fair Value 804,605 113,538
Less Than 12 Months, Gross Unrealized Losses (8,313) (222)
12 Months or Longer, Fair Value 7,954 28,063
12 Months or Longer, Gross Unrealized Losses (170) (223)
Total Fair Value 812,559 141,601
Total Gross Unrealized Losses (8,483) (445)
Residential - U.S. Government-Sponsored Enterprises    
Schedule Of Available For Sale Securities [Line Items]    
Less Than 12 Months, Fair Value 1,756,938 94,002
Less Than 12 Months, Gross Unrealized Losses (30,015) (324)
12 Months or Longer, Fair Value 43,773  
12 Months or Longer, Gross Unrealized Losses (2,025)  
Total Fair Value 1,800,711 94,002
Total Gross Unrealized Losses (32,040) (324)
Commercial - Government Agencies    
Schedule Of Available For Sale Securities [Line Items]    
Less Than 12 Months, Fair Value   25,075
Less Than 12 Months, Gross Unrealized Losses   (58)
12 Months or Longer, Fair Value 23,688  
12 Months or Longer, Gross Unrealized Losses (674)  
Total Fair Value 23,688 25,075
Total Gross Unrealized Losses (674) (58)
Mortgage-Backed Securities    
Schedule Of Available For Sale Securities [Line Items]    
Less Than 12 Months, Fair Value 2,561,543 232,615
Less Than 12 Months, Gross Unrealized Losses (38,328) (604)
12 Months or Longer, Fair Value 75,415 28,063
12 Months or Longer, Gross Unrealized Losses (2,869) (223)
Total Fair Value 2,636,958 260,678
Total Gross Unrealized Losses $ (41,197) $ (827)