OTHER ASSETS AND LIABILITIES, GENERAL AND ADMINISTRATIVE, AND OTHER ITEMS - Schedule of General and Administrative Expenses (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Schedule Of Other Income [Line Items]
Legal and professional	$ 18,587	$ 15,552	$ 36,806	$ 41,589
Loan origination	44,916	18,937	85,161	35,866
Occupancy	10,221	8,775	20,571	16,839
Subservicing	45,278	73,132	95,117	140,113
Loan servicing	4,627	7,149	9,306	15,002
Property and maintenance	15,755	8,889	27,885	16,352
Other miscellaneous general and administrative	33,602	27,557	62,001	56,710
Total general and administrative expenses	367,716	292,637	730,221	567,736
Servicing
Schedule Of Other Income [Line Items]
Compensation and benefits	61,432	59,498	126,858	110,839
Origination
Schedule Of Other Income [Line Items]
Compensation and benefits	$ 133,298	$ 73,148	$ 266,516	$ 134,426

[Line Items] for Other Income [Table]

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Subservicing Expense

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Other operating costs incurred during the reporting period and may include amounts paid to maintain the property.

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The aggregate total of expenses of managing and administering the affairs of an entity, including affiliates of the reporting entity, which are not directly or indirectly associated with the manufacture, sale or creation of a product or product line.

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Amount of expense for salary, wage, profit sharing; incentive and equity-based compensation; and other employee benefit.

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The loan servicing fees paid to third parties that relate to loan expenses for a portfolio containing the entire group of loans owned by the company.

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Expenses paid for obtaining loans which includes expenses such as application and origination fees.

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Amount of operating lease expense. Excludes sublease income.

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Amount of general and administrative expense classified as other.

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A fee charged for services from professionals such as doctors, lawyers and accountants. The term is often expanded to include other professions, for example, pharmacists charging to maintain a medicinal profile of a client or customer.

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