Investments in Servicing Related Assets, Summary (Details) - USD ($) $ in Thousands		6 Months Ended	12 Months Ended
		Jun. 30, 2022	Dec. 31, 2021
Servicing Asset [Abstract]
Unpaid principal balance		$ 20,721,685	$ 20,773,278
Carrying value	[1]	$ 263,578	$ 218,727
Weighted average coupon		3.46%	3.51%
Weighted average maturity	[2]	26 years 1 month 6 days	26 years 3 months 18 days
Year to date changes in fair value recorded in other income (loss)		$ 27,881	$ (11,062)
Mortgage Servicing Rights (MSRs) [Member]
Servicing Asset [Abstract]
Unpaid principal balance		20,721,685	20,773,278
Carrying value	[1]	$ 263,578	$ 218,727
Weighted average coupon		3.46%	3.51%
Weighted average maturity	[2]	26 years 1 month 6 days	26 years 3 months 18 days
Year to date changes in fair value recorded in other income (loss)		$ 27,881	$ (11,062)

[1] See Note 9 regarding the estimation of fair value, which approximates carrying value for all pools.

[2] Weighted average maturity of the underlying residential mortgage loans in the pool is based on the unpaid principal balance.