Quarterly report [Sections 13 or 15(d)]

Derivative Instruments and Hedging Activities - Notional Amounts of Derivative Positions (Details)

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Derivative Instruments and Hedging Activities - Notional Amounts of Derivative Positions (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Derivative [Line Items]        
Average notional amount $ (24,291,340) $ (13,389,167) $ (17,135,722) $ (11,503,991)
Inverse interest-only securities        
Derivative [Line Items]        
Average notional amount (1,903,262) (145,931) (937,547) (153,181)
Interest rate swap agreements        
Derivative [Line Items]        
Average notional amount (22,030,990) (13,365,113) (16,471,850) (13,290,306)
Swaptions, net        
Derivative [Line Items]        
Average notional amount 0 0 0 (77,372)
TBAs        
Derivative [Line Items]        
Average notional amount (4,658,871) (4,799,826) (3,422,617) (4,046,869)
Futures, net        
Derivative [Line Items]        
Average notional amount (4,344,853) (4,975,350) (3,742,509) (5,937,450)
Interest rate lock commitments        
Derivative [Line Items]        
Average notional amount (43,070) (26,775) (36,274) (14,204)
Forward mortgage loan sale commitments        
Derivative [Line Items]        
Average notional amount $ 0 $ (26,872) $ (9,943) $ (14,253)