FAIR VALUE - Financial Statement Items on Recurring Basis (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Assets
Loans held for sale, at fair value	$ 8,136,817	$ 6,955,424
Derivative assets, at fair value	194,665	647,939
Servicing rights, at fair value	2,006,712	1,127,866
Trading securities, at fair value	72,874	0
Liabilities
Derivative liabilities, at fair value	37,797	168,169
Servicing rights, at fair value	7,310	3,564
Fair Value, Recurring
Assets
Loans held for sale, at fair value	8,136,817	6,955,424
Servicing rights, at fair value	2,006,712	1,127,866
Trading securities, at fair value	72,874
Liabilities
Servicing rights, at fair value	7,310	3,564
Fair Value, Recurring \| Level 1
Assets
Loans held for sale, at fair value	0	0
Servicing rights, at fair value	0	0
Trading securities, at fair value	0
Liabilities
Servicing rights, at fair value	0	0
Fair Value, Recurring \| Level 2
Assets
Loans held for sale, at fair value	8,136,817	6,955,424
Servicing rights, at fair value	0	0
Trading securities, at fair value	72,874
Liabilities
Servicing rights, at fair value	0	0
Fair Value, Recurring \| Level 3
Assets
Loans held for sale, at fair value	0	0
Servicing rights, at fair value	2,006,712	1,127,866
Trading securities, at fair value	0
Liabilities
Servicing rights, at fair value	7,310	3,564
Fair Value, Recurring \| Carrying Amount
Assets
Cash and cash equivalents	419,571	284,224
Restricted cash	201,025	204,465
Loans held for sale, at fair value	8,136,817	6,955,424
Derivative assets, at fair value	194,665	647,939
Servicing rights, at fair value	2,006,712	1,127,866
Trading securities, at fair value	72,874
Loans eligible for repurchase	363,373	1,246,158
Liabilities
Warehouse and other lines of credit	7,457,199	6,577,429
Derivative liabilities, at fair value	37,797	168,169
Servicing rights, at fair value	7,310	3,564
Liability for loans eligible for repurchase	363,373	1,246,158
Fair Value, Recurring \| Carrying Amount \| Secured credit facilities
Liabilities
Debt obligations	343,759	22,571
Fair Value, Recurring \| Carrying Amount \| Term Notes
Liabilities
Debt obligations	199,133	198,640
Fair Value, Recurring \| Carrying Amount \| Senior Notes
Liabilities
Debt obligations	1,085,316	491,255
Fair Value, Recurring \| Estimated Fair Value \| Level 1
Assets
Cash and cash equivalents	419,571	284,224
Restricted cash	201,025	204,465
Loans held for sale, at fair value	0	0
Derivative assets, at fair value	4,924	483
Servicing rights, at fair value	0	0
Trading securities, at fair value	0
Loans eligible for repurchase	0	0
Liabilities
Warehouse and other lines of credit	0	0
Derivative liabilities, at fair value	31,070	4,299
Servicing rights, at fair value	0	0
Liability for loans eligible for repurchase	0	0
Fair Value, Recurring \| Estimated Fair Value \| Level 1 \| Secured credit facilities
Liabilities
Debt obligations	0	0
Fair Value, Recurring \| Estimated Fair Value \| Level 1 \| Term Notes
Liabilities
Debt obligations	0	0
Fair Value, Recurring \| Estimated Fair Value \| Level 1 \| Senior Notes
Liabilities
Debt obligations	0
Fair Value, Recurring \| Estimated Fair Value \| Level 2
Assets
Cash and cash equivalents	0	0
Restricted cash	0	0
Loans held for sale, at fair value	8,136,817	6,955,424
Derivative assets, at fair value	5,358	107
Servicing rights, at fair value	0	0
Trading securities, at fair value	72,874
Loans eligible for repurchase	363,373	1,246,158
Liabilities
Warehouse and other lines of credit	7,457,199	6,577,429
Derivative liabilities, at fair value	2,964	163,566
Servicing rights, at fair value	0	0
Liability for loans eligible for repurchase	363,373	1,246,158
Fair Value, Recurring \| Estimated Fair Value \| Level 2 \| Secured credit facilities
Liabilities
Debt obligations	345,596	23,593
Fair Value, Recurring \| Estimated Fair Value \| Level 2 \| Term Notes
Liabilities
Debt obligations	200,000	200,000
Fair Value, Recurring \| Estimated Fair Value \| Level 2 \| Senior Notes
Liabilities
Debt obligations	1,057,977	518,245
Fair Value, Recurring \| Estimated Fair Value \| Level 3
Assets
Cash and cash equivalents	0	0
Restricted cash	0	0
Loans held for sale, at fair value	0	0
Derivative assets, at fair value	184,383	647,349
Servicing rights, at fair value	2,006,712	1,127,866
Trading securities, at fair value	0
Loans eligible for repurchase	0	0
Liabilities
Warehouse and other lines of credit	0	0
Derivative liabilities, at fair value	3,763	304
Servicing rights, at fair value	7,310	3,564
Liability for loans eligible for repurchase	0	0
Fair Value, Recurring \| Estimated Fair Value \| Level 3 \| Secured credit facilities
Liabilities
Debt obligations	0	0
Fair Value, Recurring \| Estimated Fair Value \| Level 3 \| Term Notes
Liabilities
Debt obligations	0	0
Fair Value, Recurring \| Estimated Fair Value \| Level 3 \| Senior Notes
Liabilities
Debt obligations	$ 0

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Fair value portion of contractual arrangement with a lender under which borrowings can be made up to a specific amount at any point in time.

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