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Borrowings - Assets Pledged as Collateral (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Schedule of Borrowings [Line Items]
Outstanding borrowings	$ 41,928	$ 62,681
Restricted cash	79,049	60,514
Variable Interest Entity, Primary Beneficiary
Schedule of Borrowings [Line Items]
Restricted cash	19,440	12,371
Warehouse credit facilities | Revolving credit facility
Schedule of Borrowings [Line Items]
Outstanding borrowings	16,323	34,994
Warehouse credit facilities | Revolving credit facility | Variable Interest Entity, Primary Beneficiary
Schedule of Borrowings [Line Items]
Outstanding borrowings	16,323	34,994
Aggregate outstanding principal of loans pledged as collateral	28,854	59,709
Aggregate fair value of loans purchased and held by ULT	28,795	60,231
Restricted cash	$ 18,487	$ 11,270

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Carrying amount as of the balance sheet date of loans that have been pledged as collateral for borrowings. If the secured party has the right by contract or custom to sell or re-pledge the collateral, then the debtor reclassifies that asset and report that asset in its statement of financial position separately from other assets not so encumbered.

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Amount of cash restricted as to withdrawal or usage. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits.

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