Quarterly report pursuant to Section 13 or 15(d)

Borrowings - Additional Information (Details)

v3.20.2
Borrowings - Additional Information (Details)
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2020
USD ($)
debt_instrument
Agreement
Mar. 31, 2020
USD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2020
USD ($)
debt_instrument
Agreement
Jun. 30, 2019
USD ($)
Dec. 31, 2019
USD ($)
Jan. 10, 2020
USD ($)
Dec. 05, 2014
USD ($)
Debt Instrument [Line Items]                
Net cost basis $ 822,523,000     $ 822,523,000        
Other income 21,000   $ 48,000 1,345,000 $ 874,000      
Borrowings under lines of credit 100,000     100,000   $ 100,000    
Borrowings                
Debt Instrument [Line Items]                
Net cost basis $ 821,300,000     $ 821,300,000        
Weighted average interest rate (as percent) 3.98%   3.93% 3.98% 3.93%      
Farm Credit Notes Payable                
Debt Instrument [Line Items]                
Interest rate, increase (decrease) (as percent)   20.40%       20.40%    
Basis spread on variable rate, increase (decrease) (as percent)   0.98%       0.98%    
Number of loan agreements | Agreement 10     10        
Other income   $ 1,300,000            
MetLife Facility                
Debt Instrument [Line Items]                
Face amount of debt           $ 200,000,000.0    
Maximum borrowing capacity           75,000,000.0    
MetLife Facility | Notes and bonds payables                
Debt Instrument [Line Items]                
Face amount of debt $ 75,000,000.0     $ 75,000,000.0        
Undrawn commitment $ 75,000,000     $ 75,000,000   $ 21,500,000    
Farmer Mac Facility                
Debt Instrument [Line Items]                
Face amount of debt             $ 8,100,000 $ 125,000,000.0
Number of bonds | debt_instrument 1     1        
Extinguishment of debt, amount       $ 8,100,000        
Mortgage Notes and Bonds Payable | Notes and bonds payables                
Debt Instrument [Line Items]                
Fair value amount $ 496,500,000     496,500,000        
Secured debt 494,700,000     494,700,000        
Short Term Mortgage Notes And Bonds Payable | Notes and bonds payables                
Debt Instrument [Line Items]                
Borrowings under lines of credit $ 100,000     $ 100,000