Annual report pursuant to Section 13 and 15(d)

Borrowings - Terms of MetLife Facility (Detail)

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Borrowings - Terms of MetLife Facility (Detail) - USD ($)
12 Months Ended
Dec. 20, 2017
Sep. 08, 2017
Jul. 17, 2017
Jul. 13, 2017
Dec. 31, 2017
Jun. 16, 2016
Dec. 05, 2014
Northwest Farm Credit Services Notes Payable              
Debt Instrument [Line Items]              
Aggregate Commitment   $ 5,460,000          
Principal Outstanding         $ 5,412,000    
Term of debt   39 years 7 months 6 days          
New MetLife Credit Facility              
Debt Instrument [Line Items]              
Principal Outstanding         141,210,000    
Additional amount available to be drawn         $ 8,000,000    
Minimum annualized rate (as percent)         2.50%    
New MetLife Credit Facility | Minimum              
Debt Instrument [Line Items]              
Line of credit facility, unused capacity, commitment fee percentage         0.10%    
New MetLife Credit Facility | Maximum              
Debt Instrument [Line Items]              
Line of credit facility, unused capacity, commitment fee percentage         0.20%    
New MetLife Credit Facility | Term Notes              
Debt Instrument [Line Items]              
Aggregate Commitment         $ 200,000,000    
Principal Outstanding         131,210,000    
Undrawn Commitment         63,530,000    
Debt instrument, principal payments         $ 5,300,000    
Weighted-average interest rate (as percent)         3.30%    
Term of debt         10 years    
New MetLife Credit Facility | Line of Credit              
Debt Instrument [Line Items]              
Aggregate Commitment         $ 75,000,000    
Principal Outstanding         10,000,000    
Undrawn Commitment         $ 65,000,000    
Interest rate (as percent)         3.60%    
New MetLife Credit Facility | Line of Credit | LIBOR              
Debt Instrument [Line Items]              
Basis spread (as percent)         2.25%    
Farm Credit Central Florida Notes Payable              
Debt Instrument [Line Items]              
Aggregate Commitment       $ 5,472,000      
Principal Outstanding         $ 24,664,000    
Term of debt       28 years 4 months 14 days      
Farm Credit West Note Payable              
Debt Instrument [Line Items]              
Aggregate Commitment $ 3,555,000   $ 8,162,000        
Principal Outstanding         24,222,000    
Term of debt 20 years   20 years        
Farmer Mac Facility              
Debt Instrument [Line Items]              
Aggregate Commitment         125,000,000 $ 125,000,000 $ 75,000,000
Principal Outstanding         84,519,000    
Undrawn Commitment         39,118,000    
Additional amount available to be drawn         $ 0    
Weighted-average interest rate (as percent)         3.13%