Derivatives Volume of Activity (Details) $ in Thousands	3 Months Ended
	Mar. 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	5,325,000
Derivative, Notional Amount, Derivative Instruments Maturing, Settled, Terminated, or Paired-Off	(5,030,000)
Derivative, Notional Amount	5,175,000
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	5,811,000
Derivative, Notional Amount, Derivative Instruments Maturing, Settled, Terminated, or Paired-Off	(4,761,000)
Derivative, Notional Amount	$ 2,453,000