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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, 2019
Sep. 30, 2018
Dec. 31, 2018
Guarantor Obligations [Line Items]      
Proceeds from new securitizations $ 199,396 $ 305,391  
Guarantee fees received $ 1,122 $ 1,481  
Farmer Mac Guaranteed Securities [Member]      
Guarantor Obligations [Line Items]      
Weighted average remaining maturity, loans underlying guarantees not held by transferor 9 years 10 months 24 days   10 years 3 months 18 days
Farmer Mac Guaranteed Securities [Member] | Unconsolidated VIEs [Member]      
Guarantor Obligations [Line Items]      
Guarantor obligation, liability $ 2,400   $ 2,800
Institutional Credit [Member] | Farmer Mac Guaranteed Securities [Member]      
Guarantor Obligations [Line Items]      
Weighted average remaining maturity, loans underlying guarantees not held by transferor 2 years 4 months 24 days   5 years