Other Debt - Summary of Interest Expense (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Debt Instrument [Line Items]
Interest expense — portfolio related	$ 21,189	$ 20,324	$ 44,036	$ 39,387
Interest expense — corporate debt	$ 1,894	$ 3,353	8,237	6,706
Total interest expense			52,273	46,093
Warehouse Repurchase Facilities
Debt Instrument [Line Items]
Interest expense — portfolio related			6,932	5,834
Securitizations
Debt Instrument [Line Items]
Interest expense — portfolio related			$ 37,104	$ 33,553

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Aggregate amount of interest expense on all borrowings.

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Amount of the cost of borrowed funds accounted for as interest expense for debt.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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The aggregate interest expense incurred on the following for deposits in domestic offices: (1) transaction accounts (NOW, and telephone and preauthorized transfer accounts), (2) money market deposits and (3) savings deposits.

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