Quarterly report pursuant to Section 13 or 15(d)

Notes Payable - Additional Information (Details)

v3.21.2
Notes Payable - Additional Information (Details) - USD ($)
1 Months Ended
Jul. 31, 2021
Mar. 31, 2021
Jan. 31, 2014
Sep. 30, 2021
Mar. 01, 2021
Feb. 28, 2021
Dec. 31, 2020
Sep. 30, 2020
Jul. 31, 2020
Jul. 31, 2017
Term Note                    
Debt Instrument [Line Items]                    
Line of credit facility, maximum borrowing capacity       $ 175,000,000            
Maximum amount of committed to increase           $ 76,500,000        
Outstanding borrowings       $ 100,000,000 $ 76,500,000   $ 80,800,000      
Periodic payment, principal, percentage of outstanding balance       5.00%            
New Term Note                    
Debt Instrument [Line Items]                    
Maximum amount of committed to increase       $ 125,000,000            
Federal Funds Rate | Term Note                    
Debt Instrument [Line Items]                    
Debt instrument variable rate   0.50%                
Eurodollar Base Rate | Term Note                    
Debt Instrument [Line Items]                    
Debt instrument variable rate   1.00%                
Government National Mortgage Association | Revolving Credit Facility                    
Debt Instrument [Line Items]                    
Unused facility fee percentage     70.00%              
Line of credit facility, maximum borrowing capacity               $ 135,000,000    
Maximum amount of committed to increase               $ 200,000,000    
Outstanding borrowings       45,000,000     45,000,000      
Government National Mortgage Association | LIBOR | Revolving Credit Facility                    
Debt Instrument [Line Items]                    
Line of credit, floor interest rate     4.50%              
Federal Home Loan Mortgage Corporation | Revolving Credit Facility                    
Debt Instrument [Line Items]                    
Unused facility fee percentage 50.00%                  
Line of credit facility, maximum borrowing capacity                 $ 65,000,000 $ 25,000,000
Outstanding borrowings       $ 20,000,000     $ 20,000,000      
Federal Home Loan Mortgage Corporation | LIBOR | Revolving Credit Facility                    
Debt Instrument [Line Items]                    
Line of credit, floor interest rate 0.50%