Other Debt - Summary of Maximum Borrowing Capacity and Current Gross Balances Outstanding (Details) - USD ($)	Jun. 30, 2020	Dec. 31, 2019
Barclays Repurchase Agreement
Debt Instrument [Line Items]
Period end balance	$ 71,522,000	$ 226,212,000
Maximum borrowing capacity	300,000,000	250,000,000
Citibank Repurchase Agreement
Debt Instrument [Line Items]
Period end balance	87,098,000	190,977,000
Maximum borrowing capacity	200,000,000	200,000,000
Pacific Western Credit Agreement
Debt Instrument [Line Items]
Period end balance		2,499,000
Maximum borrowing capacity	50,000,000	50,000,000
Hershiser Capital Finance Loan Agreement
Debt Instrument [Line Items]
Period end balance	2,820,000	3,000,000
Maximum borrowing capacity	$ 3,000,000	$ 3,000,000