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Loans Held-for-Sale, Net (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Loans Held-for-Sale, Net
Loans held-for-sale	$ 349,860		$ 349,860		$ 847,126
Fair value of future MSR	11,234		11,234		16,519
Unearned discount	(722)		(722)		(2,285)
Loans held-for-sale, net	360,372		360,372		861,360
Sale of loans held-for-sale			2,949,949	$ 1,847,488
Sale of loans held-for-sale excluding acquired loans	1,990,000	$ 923,000	2,950,000	2,020,000
Gain on sale of loans held-for-sale	24,900	$ 12,900	38,200	$ 28,000
Subordinate class of certificates retained	168,457		168,457		111,028
APL certificates
Loans Held-for-Sale, Net
Subordinate class of certificates retained	63,627		63,627
APL certificates | Held-to-Maturity
Loans Held-for-Sale, Net
Subordinate class of certificates retained	63,600		$ 63,600
Minimum
Loans Held-for-Sale, Net
Period of loans held for sale sold			60 days
Maximum
Loans Held-for-Sale, Net
Period of loans held for sale sold			180 days
Greater than 90 Days Past Due
Loans Held-for-Sale, Net
Past Due	0		$ 0		0
Fannie Mae
Loans Held-for-Sale, Net
Loans held-for-sale, net	312,717		312,717		408,534
Freddie Mac
Loans Held-for-Sale, Net
Loans held-for-sale, net	20,343		20,343		36,303
FHA
Loans Held-for-Sale, Net
Loans held-for-sale, net	11,338		11,338		1,082
Private Label
Loans Held-for-Sale, Net
Loans held-for-sale, net	5,462		$ 5,462		$ 401,207
Sale of loans held-for-sale excluding acquired loans	727,200
Private Label | Held-to-Maturity
Loans Held-for-Sale, Net
Sale of loans held-for-sale excluding acquired loans	$ 727,200

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