v3.24.3
Investment Securities - Schedule of Available-for-Sale Debt Securities in a Continuous Unrealized Loss Position (Details) - USD ($)
$ in Thousands
Sep. 30, 2024
Dec. 31, 2023
Debt Securities, Available-for-sale [Line Items]    
Less Than 12 Months, Fair Value $ 458,752 $ 910,999
Less Than 12 Months, Unrealized Loss (873) (19,751)
12 Months or Longer, Fair Value 1,692,006 2,256,400
12 Months or Longer, Unrealized Loss (114,575) (327,379)
Total, Fair Value 2,150,758 3,167,399
Total, Unrealized Loss (115,448) (347,130)
U.S. Treasury securities    
Debt Securities, Available-for-sale [Line Items]    
Less Than 12 Months, Fair Value 0 0
Less Than 12 Months, Unrealized Loss 0 0
12 Months or Longer, Fair Value 275,804 636,473
12 Months or Longer, Unrealized Loss (2,396) (14,639)
Total, Fair Value 275,804 636,473
Total, Unrealized Loss (2,396) (14,639)
U.S. government agency securities    
Debt Securities, Available-for-sale [Line Items]    
Less Than 12 Months, Fair Value 0 0
Less Than 12 Months, Unrealized Loss 0 0
12 Months or Longer, Fair Value 0 106,592
12 Months or Longer, Unrealized Loss 0 (18,408)
Total, Fair Value 0 106,592
Total, Unrealized Loss 0 (18,408)
Residential mortgage-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Less Than 12 Months, Fair Value 458,752 910,999
Less Than 12 Months, Unrealized Loss (873) (19,751)
12 Months or Longer, Fair Value 1,404,200 1,501,340
12 Months or Longer, Unrealized Loss (111,390) (292,691)
Total, Fair Value 1,862,952 2,412,339
Total, Unrealized Loss (112,263) (312,442)
CRT securities    
Debt Securities, Available-for-sale [Line Items]    
Less Than 12 Months, Fair Value 0 0
Less Than 12 Months, Unrealized Loss 0 0
12 Months or Longer, Fair Value 12,002 11,995
12 Months or Longer, Unrealized Loss (789) (1,641)
Total, Fair Value 12,002 11,995
Total, Unrealized Loss $ (789) $ (1,641)