Derivatives Volume of Activity (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2025 USD ($)
Not Designated as Hedging Instrument, Economic Hedge | U.S. Treasury futures | Short position
Derivatives [Roll Forward]
Derivative, Notional Amount	$ 1,251,500
Derivative, Notional Amount, Derivative Instruments Added	2,751,500
Derivative, Notional Amount, Derivative Instruments Maturing, Settled, Terminated, or Paired-Off	2,441,500
Derivative, Notional Amount	1,561,500
Not Designated as Hedging Instrument, Economic Hedge | Interest rate swaps | Short position
Derivatives [Roll Forward]
Derivative, Notional Amount	5,385,000
Derivative, Notional Amount, Derivative Instruments Added	950,000
Derivative, Notional Amount	6,335,000
Not Designated as Hedging Instrument, Economic Hedge | Interest Rate Swaption | Long position
Derivatives [Roll Forward]
Derivative, Notional Amount	0
Derivative, Notional Amount, Derivative Instruments Added	500,000
Derivative, Notional Amount	500,000
Not Designated as Hedging Instrument, Trading | TBA securities | Long position
Derivatives [Roll Forward]
Derivative, Notional Amount	2,419,000
Derivative, Notional Amount, Derivative Instruments Added	9,124,000
Derivative, Notional Amount, Derivative Instruments Maturing, Settled, Terminated, or Paired-Off	8,694,000
Derivative, Notional Amount	$ 2,849,000