Derivatives Volume of Activity (Details) $ in Thousands	9 Months Ended
	Sep. 30, 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	(16,093,000)
Derivative, Notional Amount, Derivative Instruments Maturing, Settled, Terminated, or Paired-Off	(16,618,000)
Derivative, Notional Amount	4,355,000
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	(1,535,000)
Derivative, Notional Amount	1,535,000
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	(18,699,000)
Derivative, Notional Amount, Derivative Instruments Maturing, Settled, Terminated, or Paired-Off	(18,098,000)
Derivative, Notional Amount	$ 2,004,000