Quarterly report pursuant to Section 13 or 15(d)

Notes Payable - Additional Information (Details)

v3.21.1
Notes Payable - Additional Information (Details) - USD ($)
1 Months Ended
Mar. 31, 2021
Jul. 31, 2020
Jan. 31, 2014
Mar. 01, 2021
Feb. 28, 2021
Dec. 31, 2020
Jun. 30, 2020
Jul. 31, 2018
Jul. 31, 2017
Term Note                  
Debt Instrument [Line Items]                  
Unused facility fee percentage 0.375%                
Line of credit facility, maximum borrowing capacity $ 175,000,000.0                
Maximum amount of committed to increase         $ 76,500,000        
Outstanding borrowings $ 100,000,000.0     $ 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 $ 125,000,000.0                
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             $ 135,000,000.0    
Maximum amount of committed to increase             $ 200,000,000.0    
Outstanding borrowings $ 45,000,000.0         45,000,000.0      
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   $ 65,000,000.0           $ 50,000,000.0 $ 25,000,000.0
Outstanding borrowings $ 20,000,000.0         $ 20,000,000.0      
Federal Home Loan Mortgage Corporation | LIBOR | Revolving Credit Facility                  
Debt Instrument [Line Items]                  
Line of credit, floor interest rate   0.75%