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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 6 Months Ended
Jun. 30, 2017
USD ($)
defaulted_loan
Jun. 30, 2016
USD ($)
defaulted_loan
Jun. 30, 2017
USD ($)
defaulted_loan
Jun. 30, 2016
USD ($)
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 1 0 4 5  
Payments to Acquire Other Loans and Leases Held-for-investment $ 104 $ 0 $ 415 $ 1,415  
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Acquired During Period, Contractually Required Payments Receivable at Acquisition, During the Period 105 0 416 1,435  
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Provision for Loan Losses 0 208 0 208  
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Allowance for Loan Losses, Decreases 128 6 142 10  
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance 14,156   14,156   $ 14,669
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net 12,969   12,969   $ 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 0 311 1,267  
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 $ 104 $ 0 $ 104 $ 148