v3.26.3
Debt and Equity Securities - Schedule of Available-for-Sale Debt Securities in a Continuous Unrealized Loss Position (Details) - USD ($)
$ in Thousands
Sep. 30, 2026
Dec. 31, 2025
Debt Securities, Available-for-sale [Line Items]    
Less Than 12 Months, Fair Value $ 3,147,778 $ 203,193
Less Than 12 Months, Unrealized Loss (127,605) (97)
12 Months or Longer, Fair Value 677,165 945,019
12 Months or Longer, Unrealized Loss (119,867) (91,979)
Total, Fair Value 3,824,943 1,148,212
Total, Unrealized Loss (247,472) (92,076)
Residential mortgage-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Less Than 12 Months, Fair Value 2,912,259 203,193
Less Than 12 Months, Unrealized Loss (114,687) (97)
12 Months or Longer, Fair Value 667,046 934,222
12 Months or Longer, Unrealized Loss (119,534) (91,528)
Total, Fair Value 3,579,305 1,137,415
Total, Unrealized Loss (234,221) (91,625)
Commercial mortgage-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Less Than 12 Months, Fair Value 235,519 0
Less Than 12 Months, Unrealized Loss (12,918) 0
12 Months or Longer, Fair Value 0 0
12 Months or Longer, Unrealized Loss 0 0
Total, Fair Value 235,519 0
Total, Unrealized Loss (12,918) 0
Credit risk transfer 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 10,119 10,797
12 Months or Longer, Unrealized Loss (333) (451)
Total, Fair Value 10,119 10,797
Total, Unrealized Loss $ (333) $ (451)