Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Cash flows from operating activities
Net income before noncontrolling interests	$ 265,630	$ 245,953	$ 173,230
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Gains attributable to the fair value of future servicing rights, net of guaranty obligation	(287,145)	(358,000)	(180,766)
Change in the fair value of premiums and origination fees	19,450	(32,981)	6,041
Amortization and depreciation	210,284	169,011	152,472
Stock compensation-equity and liability classified	36,582	28,319	24,075
Provision (benefit) for credit losses	(13,287)	37,479	7,273
Deferred tax expense	34,222	47,165	22,012
Amortization of deferred loan fees and costs	(2,423)	(1,723)	(6,587)
Amortization of debt issuance costs and debt discount	7,077	4,652	5,451
Origination fees received from loans held for investment	2,550	786	2,553
Originations of loans held for sale	(17,810,768)	(22,828,602)	(15,746,949)
Proceeds from transfers of loans held for sale	18,431,542	21,216,975	16,007,910
Cash paid for cloud computing implementation costs	(1,682)	(1,199)	(6,194)
Changes in:
Receivables, net	(42,873)	(19,264)	(2,298)
Other assets	(26,613)	2,205	(20,924)
Other liabilities	46,657	71,382	2,601
Performance deposits from borrowers	1,252	6,472	(12,339)
Net cash provided by (used in) operating activities	870,455	(1,411,370)	427,561
Cash flows from investing activities
Capital expenditures	(9,208)	(2,983)	(4,711)
Purchase of equity-method investments	(33,446)	(1,682)	(923)
Purchase of pledged available-for-sale ("AFS") securities	(31,750)	(24,883)	(30,611)
Proceeds from prepayment and sale of pledged AFS securities	45,301	19,635	22,756
Investments in joint ventures	(66,718)	(24,369)	(57,573)
Distributions from joint ventures	47,065	15,907	41,629
Acquisitions, net of cash received	(420,555)	(46,784)	(7,180)
Originations of loans held for investment	(557,706)	(199,153)	(362,924)
Principal collected on loans held for investment upon payoff	649,466	379,491	319,832
Net cash provided by (used in) investing activities	(377,551)	115,179	(79,705)
Cash flows from financing activities
Borrowings (repayments) of warehouse notes payable, net	(635,912)	1,718,470	(367,864)
Borrowings of interim warehouse notes payable	266,575	60,770	179,765
Repayments of interim warehouse notes payable	(227,999)	(167,960)	(67,871)
Repayments of notes payable	(294,773)	(2,977)	(2,250)
Borrowings of notes payable	598,500
Proceeds from secured borrowings		2,766
Repayments of secured borrowings	(73,312)
Proceeds from issuance of common stock	5,252	14,021	5,511
Repurchase of common stock	(18,872)	(45,774)	(30,676)
Purchase of noncontrolling interests		(10,400)
Cash dividends paid	(64,453)	(45,350)	(37,272)
Payment of contingent consideration		(1,641)	(6,450)
Debt issuance costs	(12,732)	(4,298)	(4,531)
Net cash provided by (used in) financing activities	(457,726)	1,517,627	(331,638)
Net increase in cash, cash equivalents, restricted cash, and restricted cash equivalents (NOTE 2)	35,178	221,436	16,218
Cash, cash equivalents, restricted cash, and restricted cash equivalents at beginning of period	358,002	136,566	120,348
Total of cash, cash equivalents, restricted cash, and restricted cash equivalents at end of period	393,180	358,002	136,566
Supplemental Disclosure of Cash Flow Information:
Cash paid to third parties for interest	37,947	45,944	63,564
Cash paid for income taxes	$ 43,427	$ 29,708	$ 39,908