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Fair Value Disclosures - Quantitative Information (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Mar. 31, 2014
Dec. 31, 2013
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Financial derivatives, Liabilities $ 59,664 $ 64,388
Fair Value, Measurements, Recurring [Member] | Level 3 [Member]
   
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Available-for-sale, at fair value 65,166 65,490
Trading, at fair value 923 928
Marketable Securities 66,089 66,418
Financial derivatives, Liabilities 161 235
Indicative Bid Approach Valuation Technique [Member] | Floating Interest Rate [Member] | Fair Value, Measurements, Recurring [Member] | Auction-rate certificates backed by Government guaranteed student loans [Member]
   
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Available-for-sale, at fair value 64,963 65,285
Discounted Cash Flows Approach Valuation Technique [Member] | Fair Value, Measurements, Recurring [Member]
   
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Financial derivatives, Liabilities 161 235
Discounted Cash Flows Approach Valuation Technique [Member] | Floating Interest Rate [Member] | Fair Value, Measurements, Recurring [Member] | Asset-backed Securities [Member]
   
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Trading, at fair value 923 928
Discounted Cash Flows Approach Valuation Technique [Member] | Floating Interest Rate [Member] | Fair Value, Measurements, Recurring [Member] | Asset-backed Securities [Member] | Level 3 [Member]
   
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Fair Value Inputs, Prepayment Rate 10.00% 10.00%
Discounted Cash Flows Approach Valuation Technique [Member] | Floating Interest Rate [Member] | Fair Value, Measurements, Recurring [Member] | Collateralized Mortgage Obligations [Member] | Level 3 [Member]
   
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Fair Value Inputs, Prepayment Rate 6.00% 6.00%
Discounted Cash Flows Approach Valuation Technique [Member] | Floating Interest Rate [Member] | Fair Value, Measurements, Recurring [Member] | Government/GSE Guaranteed Mortgage Backed Securities [Member]
   
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Available-for-sale, at fair value 203 205
Farmer Mac Guarantee [Member] | Fair Value, Measurements, Recurring [Member] | Farmer Mac Guaranteed Securities AgVantage [Member] | Level 3 [Member]
   
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Available-for-sale, at fair value 3,467,655 5,070,366
Farmer Mac Guarantee [Member] | Fair Value, Measurements, Recurring [Member] | Farmer Mac Guaranteed USDA Securities [Member] | Level 3 [Member]
   
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Available-for-sale, at fair value 21,608 21,234
Farmer Mac Guarantee [Member] | Discounted Cash Flows Approach Valuation Technique [Member] | Fair Value, Measurements, Recurring [Member] | Farmer Mac Guaranteed Securities AgVantage [Member]
   
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Available-for-sale, at fair value 3,467,655 5,070,366
Farmer Mac Guarantee [Member] | Discounted Cash Flows Approach Valuation Technique [Member] | Fair Value, Measurements, Recurring [Member] | Farmer Mac Guaranteed USDA Securities [Member]
   
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Available-for-sale, at fair value 21,608 21,234
USDA Guarantee [Member] | Fair Value, Measurements, Recurring [Member] | USDA Securities [Member] | Level 3 [Member]
   
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Available-for-sale, at fair value 1,600,659 1,553,669
Trading, at fair value 51,102 58,344
Marketable Securities 1,651,761 1,612,013
USDA Guarantee [Member] | Discounted Cash Flows Approach Valuation Technique [Member] | Fair Value, Measurements, Recurring [Member] | USDA Securities [Member]
   
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Marketable Securities $ 1,651,761 $ 1,612,013
Minimum [Member] | Indicative Bid Approach Valuation Technique [Member] | Floating Interest Rate [Member] | Fair Value, Measurements, Recurring [Member] | Auction-rate certificates backed by Government guaranteed student loans [Member] | Level 3 [Member]
   
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Fair Value Inputs, Range of Offered Quotes 82.00% 82.00%
Minimum [Member] | Discounted Cash Flows Approach Valuation Technique [Member] | Fair Value, Measurements, Recurring [Member] | Derivative Financial Instruments, Liabilities [Member] | Level 3 [Member]
   
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Fair Value Inputs, Discount Rate 0.60% 0.70%
Fair Value Inputs, Prepayment Rate 10.00% 10.00%
Minimum [Member] | Discounted Cash Flows Approach Valuation Technique [Member] | Floating Interest Rate [Member] | Fair Value, Measurements, Recurring [Member] | Asset-backed Securities [Member] | Level 3 [Member]
   
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Fair Value Inputs, Discount Rate 12.20% 13.00%
Minimum [Member] | Discounted Cash Flows Approach Valuation Technique [Member] | Floating Interest Rate [Member] | Fair Value, Measurements, Recurring [Member] | Collateralized Mortgage Obligations [Member] | Level 3 [Member]
   
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Fair Value Inputs, Discount Rate 1.70% 1.80%
Minimum [Member] | Farmer Mac Guarantee [Member] | Discounted Cash Flows Approach Valuation Technique [Member] | Fair Value, Measurements, Recurring [Member] | Farmer Mac Guaranteed Securities AgVantage [Member] | Level 3 [Member]
   
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Fair Value Inputs, Discount Rate 0.80% 0.90%
Minimum [Member] | Farmer Mac Guarantee [Member] | Discounted Cash Flows Approach Valuation Technique [Member] | Fair Value, Measurements, Recurring [Member] | Farmer Mac Guaranteed USDA Securities [Member] | Level 3 [Member]
   
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Fair Value Inputs, Discount Rate 0.80% 0.90%
Fair Value Inputs, Prepayment Rate 8.00% 7.00%
Minimum [Member] | USDA Guarantee [Member] | Discounted Cash Flows Approach Valuation Technique [Member] | Fair Value, Measurements, Recurring [Member] | USDA Securities [Member] | Level 3 [Member]
   
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Fair Value Inputs, Discount Rate 1.10% 1.20%
Fair Value Inputs, Prepayment Rate 0.00% 0.00%
Maximum [Member] | Indicative Bid Approach Valuation Technique [Member] | Floating Interest Rate [Member] | Fair Value, Measurements, Recurring [Member] | Auction-rate certificates backed by Government guaranteed student loans [Member] | Level 3 [Member]
   
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Fair Value Inputs, Range of Offered Quotes 92.00% 92.00%
Maximum [Member] | Discounted Cash Flows Approach Valuation Technique [Member] | Fair Value, Measurements, Recurring [Member] | Derivative Financial Instruments, Liabilities [Member] | Level 3 [Member]
   
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Fair Value Inputs, Discount Rate 2.40% 2.30%
Fair Value Inputs, Prepayment Rate 11.00% 11.00%
Maximum [Member] | Discounted Cash Flows Approach Valuation Technique [Member] | Floating Interest Rate [Member] | Fair Value, Measurements, Recurring [Member] | Asset-backed Securities [Member] | Level 3 [Member]
   
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Fair Value Inputs, Discount Rate 20.90% 22.50%
Maximum [Member] | Discounted Cash Flows Approach Valuation Technique [Member] | Floating Interest Rate [Member] | Fair Value, Measurements, Recurring [Member] | Collateralized Mortgage Obligations [Member] | Level 3 [Member]
   
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Fair Value Inputs, Discount Rate 1.70% 1.80%
Maximum [Member] | Farmer Mac Guarantee [Member] | Discounted Cash Flows Approach Valuation Technique [Member] | Fair Value, Measurements, Recurring [Member] | Farmer Mac Guaranteed Securities AgVantage [Member] | Level 3 [Member]
   
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Fair Value Inputs, Discount Rate 2.20% 3.60%
Maximum [Member] | Farmer Mac Guarantee [Member] | Discounted Cash Flows Approach Valuation Technique [Member] | Fair Value, Measurements, Recurring [Member] | Farmer Mac Guaranteed USDA Securities [Member] | Level 3 [Member]
   
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Fair Value Inputs, Discount Rate 3.20% 3.20%
Fair Value Inputs, Prepayment Rate 15.00% 14.00%
Maximum [Member] | USDA Guarantee [Member] | Discounted Cash Flows Approach Valuation Technique [Member] | Fair Value, Measurements, Recurring [Member] | USDA Securities [Member] | Level 3 [Member]
   
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Fair Value Inputs, Discount Rate 5.20% 5.30%
Fair Value Inputs, Prepayment Rate 15.00% 23.00%
Weighted Average [Member] | Indicative Bid Approach Valuation Technique [Member] | Floating Interest Rate [Member] | Fair Value, Measurements, Recurring [Member] | Auction-rate certificates backed by Government guaranteed student loans [Member] | Level 3 [Member]
   
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Fair Value Inputs, Range of Offered Quotes 87.70% 88.10%
Weighted Average [Member] | Discounted Cash Flows Approach Valuation Technique [Member] | Fair Value, Measurements, Recurring [Member] | Derivative Financial Instruments, Liabilities [Member] | Level 3 [Member]
   
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Fair Value Inputs, Discount Rate 1.20% 1.30%
Fair Value Inputs, Prepayment Rate 10.00% 10.00%
Weighted Average [Member] | Discounted Cash Flows Approach Valuation Technique [Member] | Floating Interest Rate [Member] | Fair Value, Measurements, Recurring [Member] | Asset-backed Securities [Member] | Level 3 [Member]
   
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Fair Value Inputs, Discount Rate 16.60% 17.70%
Weighted Average [Member] | Discounted Cash Flows Approach Valuation Technique [Member] | Floating Interest Rate [Member] | Fair Value, Measurements, Recurring [Member] | Collateralized Mortgage Obligations [Member] | Level 3 [Member]
   
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Fair Value Inputs, Discount Rate 1.70% 1.80%
Weighted Average [Member] | Farmer Mac Guarantee [Member] | Discounted Cash Flows Approach Valuation Technique [Member] | Fair Value, Measurements, Recurring [Member] | Farmer Mac Guaranteed Securities AgVantage [Member] | Level 3 [Member]
   
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Fair Value Inputs, Discount Rate 1.50% 1.80%
Weighted Average [Member] | Farmer Mac Guarantee [Member] | Discounted Cash Flows Approach Valuation Technique [Member] | Fair Value, Measurements, Recurring [Member] | Farmer Mac Guaranteed USDA Securities [Member] | Level 3 [Member]
   
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Fair Value Inputs, Discount Rate 1.80% 1.90%
Fair Value Inputs, Prepayment Rate 6.00% 11.00%
Weighted Average [Member] | USDA Guarantee [Member] | Discounted Cash Flows Approach Valuation Technique [Member] | Fair Value, Measurements, Recurring [Member] | USDA Securities [Member] | Level 3 [Member]
   
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Fair Value Inputs, Discount Rate 3.20% 3.40%
Fair Value Inputs, Prepayment Rate 6.00% 5.00%