Annual report pursuant to Section 13 and 15(d)

Borrowings - Farmer Mac Facility (Detail)

v3.10.0.1
Borrowings - Farmer Mac Facility (Detail)
3 Months Ended 12 Months Ended
Sep. 13, 2018
USD ($)
Sep. 30, 2018
USD ($)
Dec. 31, 2018
USD ($)
debt_instrument
bond
Dec. 31, 2017
USD ($)
Aug. 17, 2018
USD ($)
Jul. 30, 2018
USD ($)
Mar. 13, 2018
USD ($)
Dec. 05, 2014
USD ($)
Debt Instrument [Line Items]                
Repayments of bonds     $ 23,455,000 $ 7,906,000        
Farmer Mac Bonds Payable                
Debt Instrument [Line Items]                
Debt instrument, face amount             $ 125,000,000 $ 125,000,000
Number of debt instruments issued | debt_instrument     16          
Number of debt instruments paid | bond     3          
Bonds repaid     $ 16,000,000          
Principal Outstanding             $ 90,877,000  
Weighted-average interest rate (as percent)             3.55%  
Undrawn Commitment             $ 16,342,000  
Debt instrument, loans to value ratios percentage     60.00%          
Aggregate principal amount of outstanding bonds percentage     110.00%          
Farmer Mac Bonds Payable Issued in Current Period                
Debt Instrument [Line Items]                
Debt instrument, face amount $ 4,110,000       $ 7,050,000 $ 10,356,000 $ 1,260,000  
Number of debt instruments issued | debt_instrument     4          
Term of debt 96 years 10 months 24 days              
Interest rate (as percent) 4.57%       4.06% 4.45% 4.47%  
Collateral pledged | Farmer Mac Bonds Payable                
Debt Instrument [Line Items]                
Gain on collateral pledged   $ 1,400,000