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
Mar. 31, 2026
Mar. 31, 2025
Derivative [Line Items]    
Average notional amount $ 13,662,520 $ 20,370,357
Inverse interest-only securities    
Derivative [Line Items]    
Average notional amount 1,209,616 145,136
Interest rate swap agreements    
Derivative [Line Items]    
Average notional amount 13,273,112 20,401,413
TBAs    
Derivative [Line Items]    
Average notional amount 3,827,936 3,120,322
Futures, net    
Derivative [Line Items]    
Average notional amount 4,718,100 3,350,600
Interest rate lock commitments    
Derivative [Line Items]    
Average notional amount 69,956 28,902
Forward mortgage loan sale commitments    
Derivative [Line Items]    
Average notional amount $ 0 $ 25,184