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Guarantees and Long Term Standby Purchase Commitments - Cash Flows from Off-balance sheet Guaranteed Securities (Details) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Guarantor Obligations [Line Items]      
Proceeds from sale of Farmer Mac Guaranteed Securities $ 404,246 $ 457,369  
Proceeds from Fees Received 2,141 2,333  
Payments to Acquire Loans and Leases Held-for-investment (3,147) $ (2,118)  
Variable Interest Entity, Not Primary Beneficiary [Member]      
Guarantor Obligations [Line Items]      
Guarantor Obligations, Maximum Exposure, Undiscounted $ 894,839   $ 1,802,631
Farmer Mac Guaranteed Securities [Member]      
Guarantor Obligations [Line Items]      
Weighted average remaining maturity, Loans underlying guarantees not held by transferor 10 years 1 month 18 days   10 years 8 months 18 days
Farmer Mac Guaranteed Securities [Member] | Variable Interest Entity, Not Primary Beneficiary [Member]      
Guarantor Obligations [Line Items]      
Guarantor Obligations, Current Carrying Value $ 3,800   $ 5,500
Institutional Credit [Member] | Variable Interest Entity, Not Primary Beneficiary [Member]      
Guarantor Obligations [Line Items]      
Guarantor Obligations, Maximum Exposure, Undiscounted $ 13,214   $ 983,214
Institutional Credit [Member] | Farmer Mac Guaranteed Securities [Member]      
Guarantor Obligations [Line Items]      
Weighted average remaining maturity, Loans underlying guarantees not held by transferor 1 year 1 month 8 days   8 months 8 days