Quarterly report [Sections 13 or 15(d)]

Available-for-Sale Securities, at Fair Value - Allowance for Credit Losses and Unrealized Loss (Details)

v3.26.1
Available-for-Sale Securities, at Fair Value - Allowance for Credit Losses and Unrealized Loss (Details)
$ in Thousands
Mar. 31, 2026
USD ($)
numberOfPosition
Security
Dec. 31, 2025
USD ($)
numberOfPosition
Security
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]    
Debt securities, available-for-sale, number of positions | Security 1,044 968
Debt securities, available-for-sale, continuous unrealized loss position, less than 12 months, number of positions | numberOfPosition 456 70
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer, number of positions | numberOfPosition 190 202
Less than 12 Months, Estimated Fair Value $ 3,046,044 $ 660,703
Less than 12 Months, Gross Unrealized Losses (20,877) (2,084)
12 Months or Longer, Estimated Fair Value 1,232,673 1,885,594
12 Months or Longer, Gross Unrealized Losses (38,629) (41,509)
Total, Estimated Fair Value 4,278,717 2,546,297
Total, Gross Unrealized Losses (59,506) (43,593)
Agency    
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]    
Less than 12 Months, Estimated Fair Value 3,046,044 660,143
Less than 12 Months, Gross Unrealized Losses (20,877) (1,996)
12 Months or Longer, Estimated Fair Value 1,232,570 1,885,254
12 Months or Longer, Gross Unrealized Losses (38,597) (41,410)
Total, Estimated Fair Value 4,278,614 2,545,397
Total, Gross Unrealized Losses (59,474) (43,406)
Non-Agency    
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]    
Less than 12 Months, Estimated Fair Value 0 560
Less than 12 Months, Gross Unrealized Losses 0 (88)
12 Months or Longer, Estimated Fair Value 103 340
12 Months or Longer, Gross Unrealized Losses (32) (99)
Total, Estimated Fair Value 103 900
Total, Gross Unrealized Losses $ (32) $ (187)