Derivatives Volume of Activity (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2024 USD ($)
Not Designated as Hedging Instrument, Economic Hedge | U.S. Treasury futures | Short position
Derivatives [Roll Forward]
Derivative, Notional Amount	$ 4,880,000
Derivative, Notional Amount, Derivative Instruments Added	(19,199,500)
Derivative, Notional Amount, Derivative Instruments Maturing, Settled, Terminated, or Paired-Off	(22,828,000)
Derivative, Notional Amount	1,251,500
Not Designated as Hedging Instrument, Economic Hedge | Interest rate swaps | Short position
Derivatives [Roll Forward]
Derivative, Notional Amount	0
Derivative, Notional Amount, Derivative Instruments Added	(5,385,000)
Derivative, Notional Amount	5,385,000
Not Designated as Hedging Instrument, Trading | TBA securities | Long position
Derivatives [Roll Forward]
Derivative, Notional Amount	1,403,000
Derivative, Notional Amount, Derivative Instruments Added	(26,025,000)
Derivative, Notional Amount, Derivative Instruments Maturing, Settled, Terminated, or Paired-Off	(25,009,000)
Derivative, Notional Amount	$ 2,419,000