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Loans and Allowance for Losses and Concentrations of Credit Risk - Certain Loans Acquired in Transfer (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
USD ($)
defaulted_loan
Sep. 30, 2016
USD ($)
defaulted_loan
Sep. 30, 2017
USD ($)
defaulted_loan
Sep. 30, 2016
USD ($)
defaulted_loan
Dec. 31, 2016
USD ($)
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]          
Certain Loans Acquired In Transfer Not Accounted For As Debt Securities, Number Defaulted | defaulted_loan 6 3 10 8  
Payments to Acquire Other Loans and Leases Held-for-investment $ 3,043 $ 1,102 $ 3,458 $ 2,516  
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Acquired During Period, Contractually Required Payments Receivable at Acquisition, During the Period 3,073 1,109 3,490 2,544  
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Provision for Loan Losses 0 0 0 208  
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Allowance for Loan Losses, Decreases 29 21 171 31  
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance 16,514   16,514   $ 14,669
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net 15,379   15,379   $ 13,069
Long-Term Standby Purchase Commitments [Member]          
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]          
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, UPB at acquisition 0 852 311 2,118  
Farmer Mac Guaranteed Securities [Member]          
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]          
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, UPB at acquisition $ 3,043 $ 250 $ 3,147 $ 398