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Other Debt - Summary of Maximum Borrowing Capacity and Current Gross Balances Outstanding (Details) - USD ($)
Sep. 30, 2021
Apr. 16, 2021
Jan. 29, 2021
Dec. 31, 2020
Sep. 12, 2018
Revolving Credit Facility          
Debt Instrument [Line Items]          
Maximum borrowing capacity         $ 50,000,000.0
2021 Term Repurchase Agreement | Secured Debt          
Debt Instrument [Line Items]          
Period end balance $ 21,205,000        
Maximum borrowing capacity 100,000,000        
2021 Repurchase Agreement | Secured Debt          
Debt Instrument [Line Items]          
Period end balance 127,898,000        
Maximum borrowing capacity 200,000,000 $ 100,000,000.0 $ 200,000,000.0    
2013 Repurchase Agreement | Secured Debt          
Debt Instrument [Line Items]          
Period end balance 77,209,000     $ 73,502,000  
Maximum borrowing capacity 200,000,000.0     100,000,000  
July Two Thousand Twenty One Term Repurchase Agreement          
Debt Instrument [Line Items]          
Maximum borrowing capacity 100,000,000.0        
July Two Thousand Twenty One Term Repurchase Agreement | Secured Debt          
Debt Instrument [Line Items]          
Maximum borrowing capacity 100,000,000        
Bank Credit Agreement | Revolving Credit Facility          
Debt Instrument [Line Items]          
Period end balance 30,732,000        
Maximum borrowing capacity 50,000,000        
2019-1 Trust | Secured Debt          
Debt Instrument [Line Items]          
Period end balance 2,700,000     2,700,000  
Maximum borrowing capacity $ 3,000,000     $ 3,000,000