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Debt, net - Narrative (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Debt Instrument [Line Items]      
Long-term debt $ 386,663   $ 379,617
Warehouse Borrowings due April 2022 | Residential mortgage warehouse borrowings      
Debt Instrument [Line Items]      
Long-term debt   $ 60,000  
Warehouse Borrowings due August 2022 | Residential mortgage warehouse borrowings      
Debt Instrument [Line Items]      
Long-term debt   $ 50,000