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Accounting Policies - Cash and Cash Equivalents and Statements of Cash Flows (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2015
Other Significant Noncash Transactions [Line Items]      
SEC Schedule III, Real Estate, Acquisitions Through Foreclosures $ 0 $ 4,630  
Proceeds from sale of Farmer Mac Guaranteed Securities 131,202 149,607  
Consolidation of guaranteed securities from off-balance sheet to Loans Held for Investment and Debt Securities of consolidated trusts held by third parties 96,909 117,018  
Purchases of Investment Securities Traded, Not Yet Settled $ 5,640 $ 0  
Preferred Stock Redemption Premium     $ 8,147