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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
Mar. 31, 2018
USD ($)
defaulted_loan
Mar. 31, 2017
USD ($)
defaulted_loan
Dec. 31, 2017
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 4 3  
Payments to Acquire Other Loans and Leases Held-for-investment $ 721 $ 311  
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Acquired During Period, Contractually Required Payments Receivable at Acquisition, During the Period 730 311  
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Provision for Loan Losses 0 0  
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Allowance for Loan Losses, Decreases 0 14  
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance 19,453   $ 18,866
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net 18,097   $ 17,691
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 0 311  
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 $ 721 $ 0