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Loans Held-for-Sale, Net (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2021 USD ($) loan	Dec. 31, 2020 USD ($) loan	Dec. 31, 2019 USD ($)	Feb. 28, 2022 USD ($)
Loans Held-for-Sale, Net
Loans held-for-sale	$ 1,077,239	$ 968,595
Fair value of future MSR	19,318	21,600
Unearned discount	(2,948)	(3,276)
Loans held-for-sale, net	1,093,609	986,919
Sale of loans held-for-sale excluding acquired loans	6,420,000	6,590,000	$ 4,400,000
Gain on sale of loans held-for-sale, including fees	$ 123,000	$ 94,600	$ 65,700
Number of loans | loan	580	328
Subordinate class of certificates retained	$ 210,728	$ 140,124
Amortized cost of loans on nonaccrual status	0
Held-to-maturity securities
Loans Held-for-Sale, Net
Subordinate class of certificates retained	85,700
APL certificates
Loans Held-for-Sale, Net
Subordinate class of certificates retained	149,368	63,627
APL certificates | Held-to-maturity securities
Loans Held-for-Sale, Net
Subordinate class of certificates retained	149,400	63,600
Greater than 90 Days Past Due
Loans Held-for-Sale, Net
Past Due	$ 0	0
US Government Sponsored-Enterprise Insured Loans
Loans Held-for-Sale, Net
Period of loans held for sale sold	60 days
Fannie Mae
Loans Held-for-Sale, Net
Loans held-for-sale, net	$ 392,876	679,342
Private Label
Loans Held-for-Sale, Net
Loans held-for-sale, net	$ 507,918	56,186
Period of loans held for sale sold	180 days
Sale of loans held-for-sale excluding acquired loans	$ 985,100	727,200
Private Label | Subsequent Event [Member]
Loans Held-for-Sale, Net
Subordinate class of certificates retained				$ 489,300
Subordinate certificates | Subsequent Event [Member]
Loans Held-for-Sale, Net
Subordinate class of certificates retained				$ 43,400
Freddie Mac
Loans Held-for-Sale, Net
Loans held-for-sale, net	112,561	180,004
FHA
Loans Held-for-Sale, Net
Loans held-for-sale, net	54,532	$ 53,063
SFR - Fixed Rate.
Loans Held-for-Sale, Net
Loans held-for-sale, net	$ 9,352

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Number of mortgage loans within investment in mortgage loan on real estate by entity with substantial portion of business acquiring and holding investment real estate or interest in real estate.

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