Derivatives Volume of Activity (Details) $ in Thousands	6 Months Ended
	Jun. 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	(11,035,000)
Derivative, Notional Amount, Derivative Instruments Maturing, Settled, Terminated, or Paired-Off	(10,520,000)
Derivative, Notional Amount	5,395,000
Not Designated as Hedging Instrument, Economic Hedge | Interest rate swaps
Derivatives [Roll Forward]
Derivative, Notional Amount	0
Derivative, Notional Amount, Derivative Instruments Added	(10,000)
Derivative, Notional Amount	10,000
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	(12,447,000)
Derivative, Notional Amount, Derivative Instruments Maturing, Settled, Terminated, or Paired-Off	(11,111,000)
Derivative, Notional Amount	$ 2,739,000