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Loans Held-for-Sale, Net (Details) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2021 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2021 USD ($) loan	Jun. 30, 2020 USD ($)	Dec. 31, 2020 USD ($) loan
Loans Held-for-Sale, Net
Loans held-for-sale	$ 448,940		$ 448,940		$ 968,595
Fair value of future MSR	9,669		9,669		21,600
Unearned discount	(962)		(962)		(3,276)
Loans held-for-sale, net	457,647		457,647		$ 986,919
Gain on sale of loans held-for-sale, including fees	40,900	$ 26,400	$ 69,800	$ 40,700
Number of loans | loan			405		328
Proceeds from Sale of Loans Held-for-sale, Excluding Acquisition	1,480,000	1,990,000	$ 3,320,000	2,950,000
Subordinate class of certificates retained	171,001	$ 63,600	171,001	$ 63,600	$ 140,124
Amortized cost of loans on nonaccrual status					0
APL certificates
Loans Held-for-Sale, Net
Subordinate class of certificates retained	101,868		101,868		63,627
APL certificates | Held-to-Maturity
Loans Held-for-Sale, Net
Subordinate class of certificates retained	101,900		101,900
Greater than 90 Days Past Due
Loans Held-for-Sale, Net
Past Due	0		$ 0
US Government Sponsored-Enterprise Insured Loans [Member]
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	220,944		$ 220,944		679,342
Private Label
Loans Held-for-Sale, Net
Loans held-for-sale, net	135,934		$ 135,934		56,186
Period of loans held for sale sold			180 days
Proceeds from Sale of Loans Held-for-sale, Excluding Acquisition			$ 449,900		727,200
FHA
Loans Held-for-Sale, Net
Loans held-for-sale, net	50,770		50,770		53,063
Freddie Mac
Loans Held-for-Sale, Net
Loans held-for-sale, net	39,806		39,806		$ 180,004
SFR - Fixed Rate
Loans Held-for-Sale, Net
Loans held-for-sale, net	1,486		1,486
Gain on sale of loans held-for-sale, including fees			$ 2,800
Number of loans			23
Proceeds from Sale of Loans Held-for-sale, Excluding Acquisition			$ 75,300
Subordinate class of certificates retained	$ 38,200		$ 38,200

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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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