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Fair Value Disclosures - Fair Value Measurements, Recurring and Nonrecurring (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 0 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2013
Dec. 31, 2012
Jun. 30, 2013
Fair Value, Measurements, Recurring [Member]
Level 1
Dec. 31, 2012
Fair Value, Measurements, Recurring [Member]
Level 1
Jun. 30, 2013
Fair Value, Measurements, Recurring [Member]
Level 2
Dec. 31, 2012
Fair Value, Measurements, Recurring [Member]
Level 2
Jun. 30, 2013
Fair Value, Measurements, Recurring [Member]
Level 3
Jun. 30, 2012
Fair Value, Measurements, Recurring [Member]
Level 3
Jun. 30, 2013
Fair Value, Measurements, Recurring [Member]
Level 3
Jun. 30, 2012
Fair Value, Measurements, Recurring [Member]
Level 3
Mar. 31, 2013
Fair Value, Measurements, Recurring [Member]
Level 3
Dec. 31, 2012
Fair Value, Measurements, Recurring [Member]
Level 3
Mar. 31, 2012
Fair Value, Measurements, Recurring [Member]
Level 3
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Level 3
Jun. 30, 2013
Fair Value, Measurements, Recurring [Member]
Fair Value
Dec. 31, 2012
Fair Value, Measurements, Recurring [Member]
Fair Value
Jun. 30, 2013
Fair Value, Measurements, Nonrecurring
Level 1
Dec. 31, 2012
Fair Value, Measurements, Nonrecurring
Level 1
Jun. 30, 2013
Fair Value, Measurements, Nonrecurring
Level 2
Dec. 31, 2012
Fair Value, Measurements, Nonrecurring
Level 2
Jun. 30, 2013
Fair Value, Measurements, Nonrecurring
Level 3
Dec. 31, 2012
Fair Value, Measurements, Nonrecurring
Level 3
Jun. 30, 2013
Fair Value, Measurements, Nonrecurring
Fair Value
Dec. 31, 2012
Fair Value, Measurements, Nonrecurring
Fair Value
Jun. 30, 2013
Farmer Mac Guarantee
Mar. 31, 2012
Farmer Mac Guarantee
Jun. 30, 2013
Farmer Mac Guarantee
Fair Value, Measurements, Recurring [Member]
Level 3
Jun. 30, 2012
Farmer Mac Guarantee
Fair Value, Measurements, Recurring [Member]
Level 3
Jun. 30, 2013
Farmer Mac Guarantee
Fair Value, Measurements, Recurring [Member]
Level 3
Jun. 30, 2012
Farmer Mac Guarantee
Fair Value, Measurements, Recurring [Member]
Level 3
Mar. 31, 2013
Farmer Mac Guarantee
Fair Value, Measurements, Recurring [Member]
Level 3
Dec. 31, 2012
Farmer Mac Guarantee
Fair Value, Measurements, Recurring [Member]
Level 3
Mar. 31, 2012
Farmer Mac Guarantee
Fair Value, Measurements, Recurring [Member]
Level 3
Dec. 31, 2011
Farmer Mac Guarantee
Fair Value, Measurements, Recurring [Member]
Level 3
Jun. 30, 2013
Available-for-sale Securities [Member]
Fair Value, Measurements, Recurring [Member]
Level 3
Jun. 30, 2012
Available-for-sale Securities [Member]
Fair Value, Measurements, Recurring [Member]
Level 3
Jun. 30, 2013
Available-for-sale Securities [Member]
Fair Value, Measurements, Recurring [Member]
Level 3
Jun. 30, 2012
Available-for-sale Securities [Member]
Fair Value, Measurements, Recurring [Member]
Level 3
Mar. 31, 2013
Available-for-sale Securities [Member]
Fair Value, Measurements, Recurring [Member]
Level 3
Dec. 31, 2012
Available-for-sale Securities [Member]
Fair Value, Measurements, Recurring [Member]
Level 3
Mar. 31, 2012
Available-for-sale Securities [Member]
Fair Value, Measurements, Recurring [Member]
Level 3
Dec. 31, 2011
Available-for-sale Securities [Member]
Fair Value, Measurements, Recurring [Member]
Level 3
Jun. 30, 2013
Trading Account Assets [Member]
Fair Value, Measurements, Recurring [Member]
Level 3
Jun. 30, 2012
Trading Account Assets [Member]
Fair Value, Measurements, Recurring [Member]
Level 3
Jun. 30, 2013
Trading Account Assets [Member]
Fair Value, Measurements, Recurring [Member]
Level 3
Jun. 30, 2012
Trading Account Assets [Member]
Fair Value, Measurements, Recurring [Member]
Level 3
Mar. 31, 2013
Trading Account Assets [Member]
Fair Value, Measurements, Recurring [Member]
Level 3
Dec. 31, 2012
Trading Account Assets [Member]
Fair Value, Measurements, Recurring [Member]
Level 3
Mar. 31, 2012
Trading Account Assets [Member]
Fair Value, Measurements, Recurring [Member]
Level 3
Dec. 31, 2011
Trading Account Assets [Member]
Fair Value, Measurements, Recurring [Member]
Level 3
Jun. 30, 2013
Investment Securities [Member]
Fair Value, Measurements, Recurring [Member]
Level 3
Jun. 30, 2012
Investment Securities [Member]
Fair Value, Measurements, Recurring [Member]
Level 3
Jun. 30, 2013
Investment Securities [Member]
Fair Value, Measurements, Recurring [Member]
Level 3
Jun. 30, 2012
Investment Securities [Member]
Fair Value, Measurements, Recurring [Member]
Level 3
Mar. 31, 2013
Investment Securities [Member]
Fair Value, Measurements, Recurring [Member]
Level 3
Dec. 31, 2012
Investment Securities [Member]
Fair Value, Measurements, Recurring [Member]
Level 3
Mar. 31, 2012
Investment Securities [Member]
Fair Value, Measurements, Recurring [Member]
Level 3
Dec. 31, 2011
Investment Securities [Member]
Fair Value, Measurements, Recurring [Member]
Level 3
Jun. 30, 2013
Farmer Mac Guaranteed Securities [Member]
Farmer Mac Guarantee
Fair Value, Measurements, Recurring [Member]
Level 1
Dec. 31, 2012
Farmer Mac Guaranteed Securities [Member]
Farmer Mac Guarantee
Fair Value, Measurements, Recurring [Member]
Level 1
Jun. 30, 2013
Farmer Mac Guaranteed Securities [Member]
Farmer Mac Guarantee
Fair Value, Measurements, Recurring [Member]
Level 2
Dec. 31, 2012
Farmer Mac Guaranteed Securities [Member]
Farmer Mac Guarantee
Fair Value, Measurements, Recurring [Member]
Level 2
Jun. 30, 2013
Farmer Mac Guaranteed Securities [Member]
Farmer Mac Guarantee
Fair Value, Measurements, Recurring [Member]
Level 3
Dec. 31, 2012
Farmer Mac Guaranteed Securities [Member]
Farmer Mac Guarantee
Fair Value, Measurements, Recurring [Member]
Level 3
Jun. 30, 2013
Farmer Mac Guaranteed Securities [Member]
Farmer Mac Guarantee
Fair Value, Measurements, Recurring [Member]
Fair Value
Dec. 31, 2012
Farmer Mac Guaranteed Securities [Member]
Farmer Mac Guarantee
Fair Value, Measurements, Recurring [Member]
Fair Value
Jun. 30, 2013
Farm & Ranch Guaranteed Securities [Member]
Farmer Mac Guarantee
Fair Value, Measurements, Recurring [Member]
Level 1
Dec. 31, 2012
Farm & Ranch Guaranteed Securities [Member]
Farmer Mac Guarantee
Fair Value, Measurements, Recurring [Member]
Level 1
Jun. 30, 2013
Farm & Ranch Guaranteed Securities [Member]
Farmer Mac Guarantee
Fair Value, Measurements, Recurring [Member]
Level 2
Dec. 31, 2012
Farm & Ranch Guaranteed Securities [Member]
Farmer Mac Guarantee
Fair Value, Measurements, Recurring [Member]
Level 2
Jun. 30, 2013
Farm & Ranch Guaranteed Securities [Member]
Farmer Mac Guarantee
Fair Value, Measurements, Recurring [Member]
Level 3
Dec. 31, 2012
Farm & Ranch Guaranteed Securities [Member]
Farmer Mac Guarantee
Fair Value, Measurements, Recurring [Member]
Level 3
Jun. 30, 2013
Farm & Ranch Guaranteed Securities [Member]
Farmer Mac Guarantee
Fair Value, Measurements, Recurring [Member]
Fair Value
Dec. 31, 2012
Farm & Ranch Guaranteed Securities [Member]
Farmer Mac Guarantee
Fair Value, Measurements, Recurring [Member]
Fair Value
Jun. 30, 2013
Farmer Mac Guarantee
Fair Value, Measurements, Recurring [Member]
Level 1
Dec. 31, 2012
Farmer Mac Guarantee
Fair Value, Measurements, Recurring [Member]
Level 1
Jun. 30, 2013
Farmer Mac Guarantee
Fair Value, Measurements, Recurring [Member]
Level 2
Dec. 31, 2012
Farmer Mac Guarantee
Fair Value, Measurements, Recurring [Member]
Level 2
Jun. 30, 2013
Farmer Mac Guarantee
Fair Value, Measurements, Recurring [Member]
Level 3
Dec. 31, 2012
Farmer Mac Guarantee
Fair Value, Measurements, Recurring [Member]
Level 3
Jun. 30, 2013
Farmer Mac Guarantee
Fair Value, Measurements, Recurring [Member]
Fair Value
Dec. 31, 2012
Farmer Mac Guarantee
Fair Value, Measurements, Recurring [Member]
Fair Value
Jun. 30, 2013
Farmer Mac Guaranteed Securities - Rural Utilities
Farmer Mac Guarantee
Fair Value, Measurements, Recurring [Member]
Level 1
Dec. 31, 2012
Farmer Mac Guaranteed Securities - Rural Utilities
Farmer Mac Guarantee
Fair Value, Measurements, Recurring [Member]
Level 1
Jun. 30, 2013
Farmer Mac Guaranteed Securities - Rural Utilities
Farmer Mac Guarantee
Fair Value, Measurements, Recurring [Member]
Level 2
Dec. 31, 2012
Farmer Mac Guaranteed Securities - Rural Utilities
Farmer Mac Guarantee
Fair Value, Measurements, Recurring [Member]
Level 2
Jun. 30, 2013
Farmer Mac Guaranteed Securities - Rural Utilities
Farmer Mac Guarantee
Fair Value, Measurements, Recurring [Member]
Level 3
Dec. 31, 2012
Farmer Mac Guaranteed Securities - Rural Utilities
Farmer Mac Guarantee
Fair Value, Measurements, Recurring [Member]
Level 3
Jun. 30, 2013
Farmer Mac Guaranteed Securities - Rural Utilities
Farmer Mac Guarantee
Fair Value, Measurements, Recurring [Member]
Fair Value
Dec. 31, 2012
Farmer Mac Guaranteed Securities - Rural Utilities
Farmer Mac Guarantee
Fair Value, Measurements, Recurring [Member]
Fair Value
Dec. 31, 2012
Financing Loans [Member]
Fair Value, Measurements, Nonrecurring
Level 1
Dec. 31, 2012
Financing Loans [Member]
Fair Value, Measurements, Nonrecurring
Level 2
Dec. 31, 2012
Financing Loans [Member]
Fair Value, Measurements, Nonrecurring
Level 3
Dec. 31, 2012
Financing Loans [Member]
Fair Value, Measurements, Nonrecurring
Fair Value
Jun. 30, 2013
loans held for investment [Member]
Fair Value, Measurements, Nonrecurring
Level 1
Dec. 31, 2012
loans held for investment [Member]
Fair Value, Measurements, Nonrecurring
Level 1
Jun. 30, 2013
loans held for investment [Member]
Fair Value, Measurements, Nonrecurring
Level 2
Dec. 31, 2012
loans held for investment [Member]
Fair Value, Measurements, Nonrecurring
Level 2
Jun. 30, 2013
loans held for investment [Member]
Fair Value, Measurements, Nonrecurring
Level 3
Dec. 31, 2012
loans held for investment [Member]
Fair Value, Measurements, Nonrecurring
Level 3
Jun. 30, 2013
loans held for investment [Member]
Fair Value, Measurements, Nonrecurring
Fair Value
Dec. 31, 2012
loans held for investment [Member]
Fair Value, Measurements, Nonrecurring
Fair Value
Jun. 30, 2013
REO
Fair Value, Measurements, Nonrecurring
Level 1
Dec. 31, 2012
REO
Fair Value, Measurements, Nonrecurring
Level 1
Jun. 30, 2013
REO
Fair Value, Measurements, Nonrecurring
Level 2
Dec. 31, 2012
REO
Fair Value, Measurements, Nonrecurring
Level 2
Jun. 30, 2013
REO
Fair Value, Measurements, Nonrecurring
Level 3
Dec. 31, 2012
REO
Fair Value, Measurements, Nonrecurring
Level 3
Jun. 30, 2013
REO
Fair Value, Measurements, Nonrecurring
Fair Value
Dec. 31, 2012
REO
Fair Value, Measurements, Nonrecurring
Fair Value
Jun. 30, 2013
Fair Value, Measurements, Recurring [Member]
Level 3
Jun. 30, 2012
Fair Value, Measurements, Recurring [Member]
Level 3
Jun. 30, 2013
Fair Value, Measurements, Recurring [Member]
Level 3
Jun. 30, 2012
Fair Value, Measurements, Recurring [Member]
Level 3
Jun. 30, 2013
Fair Value, Measurements, Recurring [Member]
Level 3
Jun. 30, 2012
Fair Value, Measurements, Recurring [Member]
Level 3
Jun. 30, 2013
Fair Value, Measurements, Recurring [Member]
Level 3
Jun. 30, 2012
Fair Value, Measurements, Recurring [Member]
Level 3
Mar. 31, 2013
Fair Value, Measurements, Recurring [Member]
Level 3
Dec. 31, 2012
Fair Value, Measurements, Recurring [Member]
Level 3
Mar. 31, 2012
Fair Value, Measurements, Recurring [Member]
Level 3
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Level 3
Jun. 30, 2013
Fair Value, Measurements, Recurring [Member]
Level 1
Dec. 31, 2012
Fair Value, Measurements, Recurring [Member]
Level 1
Jun. 30, 2013
Fair Value, Measurements, Recurring [Member]
Level 2
Dec. 31, 2012
Fair Value, Measurements, Recurring [Member]
Level 2
Jun. 30, 2013
Fair Value, Measurements, Recurring [Member]
Level 3
Jun. 30, 2012
Fair Value, Measurements, Recurring [Member]
Level 3
Jun. 30, 2013
Fair Value, Measurements, Recurring [Member]
Level 3
Jun. 30, 2012
Fair Value, Measurements, Recurring [Member]
Level 3
Mar. 31, 2013
Fair Value, Measurements, Recurring [Member]
Level 3
Dec. 31, 2012
Fair Value, Measurements, Recurring [Member]
Level 3
Mar. 31, 2012
Fair Value, Measurements, Recurring [Member]
Level 3
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Level 3
Jun. 30, 2013
Fair Value, Measurements, Recurring [Member]
Fair Value
Dec. 31, 2012
Fair Value, Measurements, Recurring [Member]
Fair Value
Jun. 30, 2013
Auction-rate certificates backed by Government guaranteed student loans
Floating Interest Rate [Member]
Dec. 31, 2012
Auction-rate certificates backed by Government guaranteed student loans
Floating Interest Rate [Member]
Jun. 30, 2013
Auction-rate certificates backed by Government guaranteed student loans
Fair Value, Measurements, Recurring [Member]
Floating Interest Rate [Member]
Level 1
Dec. 31, 2012
Auction-rate certificates backed by Government guaranteed student loans
Fair Value, Measurements, Recurring [Member]
Floating Interest Rate [Member]
Level 1
Jun. 30, 2013
Auction-rate certificates backed by Government guaranteed student loans
Fair Value, Measurements, Recurring [Member]
Floating Interest Rate [Member]
Level 2
Dec. 31, 2012
Auction-rate certificates backed by Government guaranteed student loans
Fair Value, Measurements, Recurring [Member]
Floating Interest Rate [Member]
Level 2
Jun. 30, 2013
Auction-rate certificates backed by Government guaranteed student loans
Fair Value, Measurements, Recurring [Member]
Floating Interest Rate [Member]
Level 3
Jun. 30, 2012
Auction-rate certificates backed by Government guaranteed student loans
Fair Value, Measurements, Recurring [Member]
Floating Interest Rate [Member]
Level 3
Jun. 30, 2013
Auction-rate certificates backed by Government guaranteed student loans
Fair Value, Measurements, Recurring [Member]
Floating Interest Rate [Member]
Level 3
Jun. 30, 2012
Auction-rate certificates backed by Government guaranteed student loans
Fair Value, Measurements, Recurring [Member]
Floating Interest Rate [Member]
Level 3
Mar. 31, 2013
Auction-rate certificates backed by Government guaranteed student loans
Fair Value, Measurements, Recurring [Member]
Floating Interest Rate [Member]
Level 3
Dec. 31, 2012
Auction-rate certificates backed by Government guaranteed student loans
Fair Value, Measurements, Recurring [Member]
Floating Interest Rate [Member]
Level 3
Mar. 31, 2012
Auction-rate certificates backed by Government guaranteed student loans
Fair Value, Measurements, Recurring [Member]
Floating Interest Rate [Member]
Level 3
Dec. 31, 2011
Auction-rate certificates backed by Government guaranteed student loans
Fair Value, Measurements, Recurring [Member]
Floating Interest Rate [Member]
Level 3
Jun. 30, 2013
Auction-rate certificates backed by Government guaranteed student loans
Fair Value, Measurements, Recurring [Member]
Floating Interest Rate [Member]
Fair Value
Dec. 31, 2012
Auction-rate certificates backed by Government guaranteed student loans
Fair Value, Measurements, Recurring [Member]
Floating Interest Rate [Member]
Fair Value
Jun. 30, 2013
Asset-backed Securities [Member]
Floating Interest Rate [Member]
Dec. 31, 2012
Asset-backed Securities [Member]
Floating Interest Rate [Member]
Dec. 31, 2012
Asset-backed Securities [Member]
Fixed Interest Rate [Member]
Jun. 30, 2013
Asset-backed Securities [Member]
Fair Value, Measurements, Recurring [Member]
Floating Interest Rate [Member]
Level 1
Dec. 31, 2012
Asset-backed Securities [Member]
Fair Value, Measurements, Recurring [Member]
Floating Interest Rate [Member]
Level 1
Jun. 30, 2013
Asset-backed Securities [Member]
Fair Value, Measurements, Recurring [Member]
Floating Interest Rate [Member]
Level 2
Dec. 31, 2012
Asset-backed Securities [Member]
Fair Value, Measurements, Recurring [Member]
Floating Interest Rate [Member]
Level 2
Jun. 30, 2013
Asset-backed Securities [Member]
Fair Value, Measurements, Recurring [Member]
Floating Interest Rate [Member]
Level 3
Dec. 31, 2012
Asset-backed Securities [Member]
Fair Value, Measurements, Recurring [Member]
Floating Interest Rate [Member]
Level 3
Jun. 30, 2013
Asset-backed Securities [Member]
Fair Value, Measurements, Recurring [Member]
Floating Interest Rate [Member]
Fair Value
Dec. 31, 2012
Asset-backed Securities [Member]
Fair Value, Measurements, Recurring [Member]
Floating Interest Rate [Member]
Fair Value
Dec. 31, 2012
Asset-backed Securities [Member]
Fair Value, Measurements, Recurring [Member]
Fixed Interest Rate [Member]
Level 1
Dec. 31, 2012
Asset-backed Securities [Member]
Fair Value, Measurements, Recurring [Member]
Fixed Interest Rate [Member]
Level 2
Dec. 31, 2012
Asset-backed Securities [Member]
Fair Value, Measurements, Recurring [Member]
Fixed Interest Rate [Member]
Level 3
Dec. 31, 2012
Asset-backed Securities [Member]
Fair Value, Measurements, Recurring [Member]
Fixed Interest Rate [Member]
Fair Value
Jun. 30, 2013
Asset-backed Securities [Member]
Fair Value, Measurements, Recurring [Member]
Level 3
Jun. 30, 2012
Asset-backed Securities [Member]
Fair Value, Measurements, Recurring [Member]
Level 3
Jun. 30, 2013
Asset-backed Securities [Member]
Fair Value, Measurements, Recurring [Member]
Level 3
Jun. 30, 2012
Asset-backed Securities [Member]
Fair Value, Measurements, Recurring [Member]
Level 3
Mar. 31, 2013
Asset-backed Securities [Member]
Fair Value, Measurements, Recurring [Member]
Level 3
Dec. 31, 2012
Asset-backed Securities [Member]
Fair Value, Measurements, Recurring [Member]
Level 3
Mar. 31, 2012
Asset-backed Securities [Member]
Fair Value, Measurements, Recurring [Member]
Level 3
Dec. 31, 2011
Asset-backed Securities [Member]
Fair Value, Measurements, Recurring [Member]
Level 3
Jun. 30, 2013
Asset-backed Securities [Member]
Trading Account Assets [Member]
Fair Value, Measurements, Recurring [Member]
Floating Interest Rate [Member]
Level 1
Dec. 31, 2012
Asset-backed Securities [Member]
Trading Account Assets [Member]
Fair Value, Measurements, Recurring [Member]
Floating Interest Rate [Member]
Level 1
Jun. 30, 2013
Asset-backed Securities [Member]
Trading Account Assets [Member]
Fair Value, Measurements, Recurring [Member]
Floating Interest Rate [Member]
Level 2
Dec. 31, 2012
Asset-backed Securities [Member]
Trading Account Assets [Member]
Fair Value, Measurements, Recurring [Member]
Floating Interest Rate [Member]
Level 2
Jun. 30, 2013
Asset-backed Securities [Member]
Trading Account Assets [Member]
Fair Value, Measurements, Recurring [Member]
Floating Interest Rate [Member]
Level 3
Jun. 30, 2012
Asset-backed Securities [Member]
Trading Account Assets [Member]
Fair Value, Measurements, Recurring [Member]
Floating Interest Rate [Member]
Level 3
Jun. 30, 2013
Asset-backed Securities [Member]
Trading Account Assets [Member]
Fair Value, Measurements, Recurring [Member]
Floating Interest Rate [Member]
Level 3
Jun. 30, 2012
Asset-backed Securities [Member]
Trading Account Assets [Member]
Fair Value, Measurements, Recurring [Member]
Floating Interest Rate [Member]
Level 3
Mar. 31, 2013
Asset-backed Securities [Member]
Trading Account Assets [Member]
Fair Value, Measurements, Recurring [Member]
Floating Interest Rate [Member]
Level 3
Dec. 31, 2012
Asset-backed Securities [Member]
Trading Account Assets [Member]
Fair Value, Measurements, Recurring [Member]
Floating Interest Rate [Member]
Level 3
Mar. 31, 2012
Asset-backed Securities [Member]
Trading Account Assets [Member]
Fair Value, Measurements, Recurring [Member]
Floating Interest Rate [Member]
Level 3
Dec. 31, 2011
Asset-backed Securities [Member]
Trading Account Assets [Member]
Fair Value, Measurements, Recurring [Member]
Floating Interest Rate [Member]
Level 3
Jun. 30, 2013
Asset-backed Securities [Member]
Trading Account Assets [Member]
Fair Value, Measurements, Recurring [Member]
Floating Interest Rate [Member]
Fair Value
Dec. 31, 2012
Asset-backed Securities [Member]
Trading Account Assets [Member]
Fair Value, Measurements, Recurring [Member]
Floating Interest Rate [Member]
Fair Value
Jun. 30, 2013
Corporate Debt Securities [Member]
Floating Interest Rate [Member]
Dec. 31, 2012
Corporate Debt Securities [Member]
Floating Interest Rate [Member]
Jun. 30, 2013
Corporate Debt Securities [Member]
Fixed Interest Rate [Member]
Dec. 31, 2012
Corporate Debt Securities [Member]
Fixed Interest Rate [Member]
Jun. 30, 2013
Corporate Debt Securities [Member]
Fair Value, Measurements, Recurring [Member]
Floating Interest Rate [Member]
Level 1
Dec. 31, 2012
Corporate Debt Securities [Member]
Fair Value, Measurements, Recurring [Member]
Floating Interest Rate [Member]
Level 1
Jun. 30, 2013
Corporate Debt Securities [Member]
Fair Value, Measurements, Recurring [Member]
Floating Interest Rate [Member]
Level 2
Dec. 31, 2012
Corporate Debt Securities [Member]
Fair Value, Measurements, Recurring [Member]
Floating Interest Rate [Member]
Level 2
Jun. 30, 2013
Corporate Debt Securities [Member]
Fair Value, Measurements, Recurring [Member]
Floating Interest Rate [Member]
Level 3
Dec. 31, 2012
Corporate Debt Securities [Member]
Fair Value, Measurements, Recurring [Member]
Floating Interest Rate [Member]
Level 3
Jun. 30, 2013
Corporate Debt Securities [Member]
Fair Value, Measurements, Recurring [Member]
Floating Interest Rate [Member]
Fair Value
Dec. 31, 2012
Corporate Debt Securities [Member]
Fair Value, Measurements, Recurring [Member]
Floating Interest Rate [Member]
Fair Value
Jun. 30, 2013
Corporate Debt Securities [Member]
Fair Value, Measurements, Recurring [Member]
Fixed Interest Rate [Member]
Level 1
Dec. 31, 2012
Corporate Debt Securities [Member]
Fair Value, Measurements, Recurring [Member]
Fixed Interest Rate [Member]
Level 1
Jun. 30, 2013
Corporate Debt Securities [Member]
Fair Value, Measurements, Recurring [Member]
Fixed Interest Rate [Member]
Level 2
Dec. 31, 2012
Corporate Debt Securities [Member]
Fair Value, Measurements, Recurring [Member]
Fixed Interest Rate [Member]
Level 2
Jun. 30, 2013
Corporate Debt Securities [Member]
Fair Value, Measurements, Recurring [Member]
Fixed Interest Rate [Member]
Level 3
Dec. 31, 2012
Corporate Debt Securities [Member]
Fair Value, Measurements, Recurring [Member]
Fixed Interest Rate [Member]
Level 3
Jun. 30, 2013
Corporate Debt Securities [Member]
Fair Value, Measurements, Recurring [Member]
Fixed Interest Rate [Member]
Fair Value
Dec. 31, 2012
Corporate Debt Securities [Member]
Fair Value, Measurements, Recurring [Member]
Fixed Interest Rate [Member]
Fair Value
Jun. 30, 2013
Collateralized Mortgage Backed Securities [Member]
Floating Interest Rate [Member]
Dec. 31, 2012
Collateralized Mortgage Backed Securities [Member]
Floating Interest Rate [Member]
Jun. 30, 2013
Collateralized Mortgage Backed Securities [Member]
Fixed Interest Rate [Member]
Dec. 31, 2012
Collateralized Mortgage Backed Securities [Member]
Fixed Interest Rate [Member]
Jun. 30, 2013
Collateralized Mortgage Backed Securities [Member]
Fair Value, Measurements, Recurring [Member]
Floating Interest Rate [Member]
Level 1
Dec. 31, 2012
Collateralized Mortgage Backed Securities [Member]
Fair Value, Measurements, Recurring [Member]
Floating Interest Rate [Member]
Level 1
Jun. 30, 2013
Collateralized Mortgage Backed Securities [Member]
Fair Value, Measurements, Recurring [Member]
Floating Interest Rate [Member]
Level 2
Dec. 31, 2012
Collateralized Mortgage Backed Securities [Member]
Fair Value, Measurements, Recurring [Member]
Floating Interest Rate [Member]
Level 2
Jun. 30, 2013
Collateralized Mortgage Backed Securities [Member]
Fair Value, Measurements, Recurring [Member]
Floating Interest Rate [Member]
Level 3
Jun. 30, 2013
Collateralized Mortgage Backed Securities [Member]
Fair Value, Measurements, Recurring [Member]
Floating Interest Rate [Member]
Level 3
Mar. 31, 2013
Collateralized Mortgage Backed Securities [Member]
Fair Value, Measurements, Recurring [Member]
Floating Interest Rate [Member]
Level 3
Dec. 31, 2012
Collateralized Mortgage Backed Securities [Member]
Fair Value, Measurements, Recurring [Member]
Floating Interest Rate [Member]
Level 3
Jun. 30, 2013
Collateralized Mortgage Backed Securities [Member]
Fair Value, Measurements, Recurring [Member]
Floating Interest Rate [Member]
Fair Value
Dec. 31, 2012
Collateralized Mortgage Backed Securities [Member]
Fair Value, Measurements, Recurring [Member]
Floating Interest Rate [Member]
Fair Value
Jun. 30, 2013
Collateralized Mortgage Backed Securities [Member]
Fair Value, Measurements, Recurring [Member]
Fixed Interest Rate [Member]
Level 1
Dec. 31, 2012
Collateralized Mortgage Backed Securities [Member]
Fair Value, Measurements, Recurring [Member]
Fixed Interest Rate [Member]
Level 1
Jun. 30, 2013
Collateralized Mortgage Backed Securities [Member]
Fair Value, Measurements, Recurring [Member]
Fixed Interest Rate [Member]
Level 2
Dec. 31, 2012
Collateralized Mortgage Backed Securities [Member]
Fair Value, Measurements, Recurring [Member]
Fixed Interest Rate [Member]
Level 2
Jun. 30, 2013
Collateralized Mortgage Backed Securities [Member]
Fair Value, Measurements, Recurring [Member]
Fixed Interest Rate [Member]
Level 3
Dec. 31, 2012
Collateralized Mortgage Backed Securities [Member]
Fair Value, Measurements, Recurring [Member]
Fixed Interest Rate [Member]
Level 3
Jun. 30, 2013
Collateralized Mortgage Backed Securities [Member]
Fair Value, Measurements, Recurring [Member]
Fixed Interest Rate [Member]
Fair Value
Dec. 31, 2012
Collateralized Mortgage Backed Securities [Member]
Fair Value, Measurements, Recurring [Member]
Fixed Interest Rate [Member]
Fair Value
Jun. 30, 2013
Subordinated Debt [Member]
Floating Interest Rate [Member]
Dec. 31, 2012
Subordinated Debt [Member]
Floating Interest Rate [Member]
Jun. 30, 2013
Subordinated Debt [Member]
Fair Value, Measurements, Recurring [Member]
Floating Interest Rate [Member]
Level 1
Dec. 31, 2012
Subordinated Debt [Member]
Fair Value, Measurements, Recurring [Member]
Floating Interest Rate [Member]
Level 1
Jun. 30, 2013
Subordinated Debt [Member]
Fair Value, Measurements, Recurring [Member]
Floating Interest Rate [Member]
Level 2
Dec. 31, 2012
Subordinated Debt [Member]
Fair Value, Measurements, Recurring [Member]
Floating Interest Rate [Member]
Level 2
Jun. 30, 2013
Subordinated Debt [Member]
Fair Value, Measurements, Recurring [Member]
Floating Interest Rate [Member]
Level 3
Dec. 31, 2012
Subordinated Debt [Member]
Fair Value, Measurements, Recurring [Member]
Floating Interest Rate [Member]
Level 3
Jun. 30, 2013
Subordinated Debt [Member]
Fair Value, Measurements, Recurring [Member]
Floating Interest Rate [Member]
Fair Value
Dec. 31, 2012
Subordinated Debt [Member]
Fair Value, Measurements, Recurring [Member]
Floating Interest Rate [Member]
Fair Value
Dec. 31, 2012
Commercial Paper [Member]
Fair Value, Measurements, Recurring [Member]
Fixed Interest Rate [Member]
Level 1
Dec. 31, 2012
Commercial Paper [Member]
Fair Value, Measurements, Recurring [Member]
Fixed Interest Rate [Member]
Level 2
Dec. 31, 2012
Commercial Paper [Member]
Fair Value, Measurements, Recurring [Member]
Fixed Interest Rate [Member]
Level 3
Dec. 31, 2012
Commercial Paper [Member]
Fair Value, Measurements, Recurring [Member]
Fixed Interest Rate [Member]
Fair Value
Jun. 30, 2013
US Treasury Securities [Member]
Fixed Interest Rate [Member]
Dec. 31, 2012
US Treasury Securities [Member]
Fixed Interest Rate [Member]
Jun. 30, 2013
US Treasury Securities [Member]
Fair Value, Measurements, Recurring [Member]
Fixed Interest Rate [Member]
Level 1
Dec. 31, 2012
US Treasury Securities [Member]
Fair Value, Measurements, Recurring [Member]
Fixed Interest Rate [Member]
Level 1
Jun. 30, 2013
US Treasury Securities [Member]
Fair Value, Measurements, Recurring [Member]
Fixed Interest Rate [Member]
Level 2
Dec. 31, 2012
US Treasury Securities [Member]
Fair Value, Measurements, Recurring [Member]
Fixed Interest Rate [Member]
Level 2
Jun. 30, 2013
US Treasury Securities [Member]
Fair Value, Measurements, Recurring [Member]
Fixed Interest Rate [Member]
Level 3
Dec. 31, 2012
US Treasury Securities [Member]
Fair Value, Measurements, Recurring [Member]
Fixed Interest Rate [Member]
Level 3
Jun. 30, 2013
US Treasury Securities [Member]
Fair Value, Measurements, Recurring [Member]
Fixed Interest Rate [Member]
Fair Value
Dec. 31, 2012
US Treasury Securities [Member]
Fair Value, Measurements, Recurring [Member]
Fixed Interest Rate [Member]
Fair Value
Jun. 30, 2013
Taxable Municipal Bonds [Member]
Fixed Interest Rate [Member]
Jun. 30, 2013
Taxable Municipal Bonds [Member]
Fair Value, Measurements, Recurring [Member]
Fixed Interest Rate [Member]
Level 1
Jun. 30, 2013
Taxable Municipal Bonds [Member]
Fair Value, Measurements, Recurring [Member]
Fixed Interest Rate [Member]
Level 2
Jun. 30, 2013
Taxable Municipal Bonds [Member]
Fair Value, Measurements, Recurring [Member]
Fixed Interest Rate [Member]
Level 3
Jun. 30, 2013
Taxable Municipal Bonds [Member]
Fair Value, Measurements, Recurring [Member]
Fixed Interest Rate [Member]
Fair Value
Jun. 30, 2013
Senior Agency Debt Securities
Floating Interest Rate [Member]
Dec. 31, 2012
Senior Agency Debt Securities
Floating Interest Rate [Member]
Jun. 30, 2013
Senior Agency Debt Securities
Fixed Interest Rate [Member]
Dec. 31, 2012
Senior Agency Debt Securities
Fixed Interest Rate [Member]
Jun. 30, 2013
Senior Agency Debt Securities
Fair Value, Measurements, Recurring [Member]
Floating Interest Rate [Member]
Level 1
Dec. 31, 2012
Senior Agency Debt Securities
Fair Value, Measurements, Recurring [Member]
Floating Interest Rate [Member]
Level 1
Jun. 30, 2013
Senior Agency Debt Securities
Fair Value, Measurements, Recurring [Member]
Floating Interest Rate [Member]
Level 2
Dec. 31, 2012
Senior Agency Debt Securities
Fair Value, Measurements, Recurring [Member]
Floating Interest Rate [Member]
Level 2
Jun. 30, 2013
Senior Agency Debt Securities
Fair Value, Measurements, Recurring [Member]
Floating Interest Rate [Member]
Level 3
Dec. 31, 2012
Senior Agency Debt Securities
Fair Value, Measurements, Recurring [Member]
Floating Interest Rate [Member]
Level 3
Jun. 30, 2013
Senior Agency Debt Securities
Fair Value, Measurements, Recurring [Member]
Floating Interest Rate [Member]
Fair Value
Dec. 31, 2012
Senior Agency Debt Securities
Fair Value, Measurements, Recurring [Member]
Floating Interest Rate [Member]
Fair Value
Jun. 30, 2013
Senior Agency Debt Securities
Fair Value, Measurements, Recurring [Member]
Fixed Interest Rate [Member]
Level 1
Dec. 31, 2012
Senior Agency Debt Securities
Fair Value, Measurements, Recurring [Member]
Fixed Interest Rate [Member]
Level 1
Jun. 30, 2013
Senior Agency Debt Securities
Fair Value, Measurements, Recurring [Member]
Fixed Interest Rate [Member]
Level 2
Dec. 31, 2012
Senior Agency Debt Securities
Fair Value, Measurements, Recurring [Member]
Fixed Interest Rate [Member]
Level 2
Jun. 30, 2013
Senior Agency Debt Securities
Fair Value, Measurements, Recurring [Member]
Fixed Interest Rate [Member]
Level 3
Dec. 31, 2012
Senior Agency Debt Securities
Fair Value, Measurements, Recurring [Member]
Fixed Interest Rate [Member]
Level 3
Jun. 30, 2013
Senior Agency Debt Securities
Fair Value, Measurements, Recurring [Member]
Fixed Interest Rate [Member]
Fair Value
Dec. 31, 2012
Senior Agency Debt Securities
Fair Value, Measurements, Recurring [Member]
Fixed Interest Rate [Member]
Fair Value
Jun. 30, 2013
Preferred Stock [Member]
Fixed Interest Rate [Member]
Dec. 31, 2012
Preferred Stock [Member]
Fixed Interest Rate [Member]
Jun. 30, 2013
Preferred Stock [Member]
Fair Value, Measurements, Recurring [Member]
Fixed Interest Rate [Member]
Level 1
Dec. 31, 2012
Preferred Stock [Member]
Fair Value, Measurements, Recurring [Member]
Fixed Interest Rate [Member]
Level 1
Jun. 30, 2013
Preferred Stock [Member]
Fair Value, Measurements, Recurring [Member]
Fixed Interest Rate [Member]
Level 2
Dec. 31, 2012
Preferred Stock [Member]
Fair Value, Measurements, Recurring [Member]
Fixed Interest Rate [Member]
Level 2
Jun. 30, 2013
Preferred Stock [Member]
Fair Value, Measurements, Recurring [Member]
Fixed Interest Rate [Member]
Level 3
Dec. 31, 2012
Preferred Stock [Member]
Fair Value, Measurements, Recurring [Member]
Fixed Interest Rate [Member]
Level 3
Jun. 30, 2013
Preferred Stock [Member]
Fair Value, Measurements, Recurring [Member]
Fixed Interest Rate [Member]
Fair Value
Dec. 31, 2012
Preferred Stock [Member]
Fair Value, Measurements, Recurring [Member]
Fixed Interest Rate [Member]
Fair Value
Jun. 30, 2013
Derivative Financial Instruments, Liabilities [Member]
Fair Value, Measurements, Recurring [Member]
Level 3
Jun. 30, 2012
Derivative Financial Instruments, Liabilities [Member]
Fair Value, Measurements, Recurring [Member]
Level 3
Jun. 30, 2013
Derivative Financial Instruments, Liabilities [Member]
Fair Value, Measurements, Recurring [Member]
Level 3
Jun. 30, 2012
Derivative Financial Instruments, Liabilities [Member]
Fair Value, Measurements, Recurring [Member]
Level 3
Mar. 31, 2013
Derivative Financial Instruments, Liabilities [Member]
Fair Value, Measurements, Recurring [Member]
Level 3
Dec. 31, 2012
Derivative Financial Instruments, Liabilities [Member]
Fair Value, Measurements, Recurring [Member]
Level 3
Mar. 31, 2012
Derivative Financial Instruments, Liabilities [Member]
Fair Value, Measurements, Recurring [Member]
Level 3
Dec. 31, 2011
Derivative Financial Instruments, Liabilities [Member]
Fair Value, Measurements, Recurring [Member]
Level 3
Jun. 30, 2013
Farmer Mac Guarantee
Fair Value, Measurements, Recurring [Member]
Level 3
Jun. 30, 2012
Farmer Mac Guarantee
Fair Value, Measurements, Recurring [Member]
Level 3
Jun. 30, 2013
Farmer Mac Guarantee
Fair Value, Measurements, Recurring [Member]
Level 3
Jun. 30, 2012
Farmer Mac Guarantee
Fair Value, Measurements, Recurring [Member]
Level 3
Mar. 31, 2013
Farmer Mac Guarantee
Fair Value, Measurements, Recurring [Member]
Level 3
Dec. 31, 2012
Farmer Mac Guarantee
Fair Value, Measurements, Recurring [Member]
Level 3
Mar. 31, 2012
Farmer Mac Guarantee
Fair Value, Measurements, Recurring [Member]
Level 3
Dec. 31, 2011
Farmer Mac Guarantee
Fair Value, Measurements, Recurring [Member]
Level 3
Jun. 30, 2013
Rural Utilities [Member]
Farmer Mac Guarantee
Fair Value, Measurements, Recurring [Member]
Level 3
Jun. 30, 2012
Rural Utilities [Member]
Farmer Mac Guarantee
Fair Value, Measurements, Recurring [Member]
Level 3
Jun. 30, 2013
Rural Utilities [Member]
Farmer Mac Guarantee
Fair Value, Measurements, Recurring [Member]
Level 3
Jun. 30, 2012
Rural Utilities [Member]
Farmer Mac Guarantee
Fair Value, Measurements, Recurring [Member]
Level 3
Mar. 31, 2013
Rural Utilities [Member]
Farmer Mac Guarantee
Fair Value, Measurements, Recurring [Member]
Level 3
Dec. 31, 2012
Rural Utilities [Member]
Farmer Mac Guarantee
Fair Value, Measurements, Recurring [Member]
Level 3
Mar. 31, 2012
Rural Utilities [Member]
Farmer Mac Guarantee
Fair Value, Measurements, Recurring [Member]
Level 3
Dec. 31, 2011
Rural Utilities [Member]
Farmer Mac Guarantee
Fair Value, Measurements, Recurring [Member]
Level 3
Jun. 30, 2013
Farm & Ranch [Member]
Farmer Mac Guarantee
Fair Value, Measurements, Recurring [Member]
Level 3
Jun. 30, 2012
Farm & Ranch [Member]
Farmer Mac Guarantee
Fair Value, Measurements, Recurring [Member]
Level 3
Jun. 30, 2013
Farm & Ranch [Member]
Farmer Mac Guarantee
Fair Value, Measurements, Recurring [Member]
Level 3
Jun. 30, 2012
Farm & Ranch [Member]
Farmer Mac Guarantee
Fair Value, Measurements, Recurring [Member]
Level 3
Mar. 31, 2013
Farm & Ranch [Member]
Farmer Mac Guarantee
Fair Value, Measurements, Recurring [Member]
Level 3
Dec. 31, 2012
Farm & Ranch [Member]
Farmer Mac Guarantee
Fair Value, Measurements, Recurring [Member]
Level 3
Mar. 31, 2012
Farm & Ranch [Member]
Farmer Mac Guarantee
Fair Value, Measurements, Recurring [Member]
Level 3
Dec. 31, 2011
Farm & Ranch [Member]
Farmer Mac Guarantee
Fair Value, Measurements, Recurring [Member]
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value             $ 6,742,583 $ 6,071,067 $ 6,742,583 $ 6,071,067 $ 6,823,086 $ 6,421,447 $ 5,963,474 $ 5,843,186                         $ 5,058,853 $ 4,444,467 $ 5,058,853 $ 4,444,467 $ 5,100,080 $ 4,766,258 $ 4,389,861 $ 4,289,272 $ 65,310 $ 59,707 $ 65,310 $ 59,707 $ 65,446 $ 63,159 $ 58,868 $ 60,213 $ 1,064 $ 1,430 $ 1,064 $ 1,430 $ 1,129 $ 1,247 $ 1,646 $ 1,796 $ 66,374 $ 61,137 $ 66,374 $ 61,137 $ 66,575 $ 64,406 $ 60,514 $ 62,009                                                                                                                 $ 73,592 [1],[2] $ 146,825 [3],[4] $ 73,592 [1],[2] $ 146,825 [3],[4] $ 87,271 [2] $ 104,188 [1] $ 184,397 [4] $ 212,359 [3]         $ 1,617,356 $ 1,565,463 $ 1,617,356 $ 1,565,463 $ 1,656,431 $ 1,590,783 $ 1,513,099 $ 1,491,905                 $ 65,088 $ 59,707 $ 65,088 $ 59,707 $ 65,213 $ 63,159 $ 58,868 $ 60,213                                   $ 1,543,764 $ 1,418,638 $ 1,543,764 $ 1,418,638 $ 1,569,160 $ 1,486,595 $ 1,328,702 $ 1,279,546         $ 1,064 [5],[6] $ 1,430 [7],[8] $ 1,064 [5],[6] $ 1,430 [7],[8] $ 1,129 [6] $ 1,247 [5] $ 1,646 [8] $ 1,796 [7]                                                             $ 222 $ 222 $ 233 $ 0                                                                                                                                                           $ 25,794 $ 29,899 $ 25,794 $ 29,899 $ 27,198 $ 26,681 $ 36,129 $ 35,599 $ 1,534,585 $ 1,191,236 $ 1,534,585 $ 1,191,236 $ 1,544,362 $ 1,313,088 $ 1,345,509 $ 1,446,046 $ 3,498,474 $ 3,223,332 $ 3,498,474 $ 3,223,332 $ 3,528,520 $ 3,426,489 $ 3,008,223 $ 2,807,627
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases             310,897 365,613 858,317 667,338                                 200,000 205,327 625,000 405,327         0 0 233 0         0 0 0 0         0 0 233 0                                                                                                                         0 [2] 0 [4] 0 [1] 0 [3]                 110,897 160,286 233,084 262,011                         0 0 0 0                                           110,897 160,286 233,084 262,011                 0 [6] 0 [8] 0 [5] 0 [7]                                                                     0 233                                                                                                                                                               0 5,327 0 5,327         0 0 325,000 0         200,000 200,000 300,000 400,000        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales             0 (5,327) 0 (5,327)                                 0 (5,327) 0 (5,327)         0 0 0 0         0 0 0 0         0 0 0 0                                                                                                                         0 [2] 0 [4] 0 [1] 0 [3]                 0 0 0 0                         0 0 0 0                                           0 0 0 0                 0 [6] 0 [8] 0 [5] 0 [7]                                                                     0 0                                                                                                                                                               0 (5,327) 0 (5,327)         0 0 0 0         0 0 0 0        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements             (296,824) (261,271) (461,587) (440,437)                                 (207,034) (156,794) (285,350) (252,731)         (9) 0 (9) 0         (186) (239) (500) (527)         (195) (239) (509) (527)                                                                                                                         (13,231) [2] (34,463) [4] (30,162) [1] (63,386) [3]                 (89,595) (104,238) (175,728) (187,179)                         0 0 0 0                                           (76,364) (69,775) (145,566) (123,793)                 (186) [6] (239) [8] (500) [5] (527) [7]                                                                     (9) (9)                                                                                                                                                               (515) (5,787) (898) (6,015)         (5,311) (150,000) (83,235) (245,701)         (201,208) (1,007) (201,217) (1,015)        
Available-for-sale securities     1,054,381 1,165,889 1,336,161 1,269,334 65,310   65,310     63,159     2,455,852 2,498,382                 5,058,853 4,766,258                                                                 0 0 0 0 5,058,853 4,766,258 5,058,853 4,766,258 0 0 0 0 3,498,474 3,426,489 3,498,474 3,426,489 0 0 0 0 25,794 26,681 25,794 26,681 0 0 0 0 1,534,585 1,313,088 1,534,585 1,313,088                                                                 0 0 0 0 1,543,764   1,543,764     1,486,595     1,543,764 1,486,595 65,088 63,159 0 0 0 0 65,088   65,088     63,159     65,088 63,159 158,292 151,044 6,501 0 0 158,292 151,044 0 0 158,292 151,044 0 6,501 0 6,501                                             104,656 76,763 65,065 52,416 0 0 104,656 76,763 0 0 104,656 76,763 0 0 65,065 52,416 0 0 65,065 52,416 664,107 712,859 5,833 [9] 2,065 0 0 663,885 712,859 222 222   0 664,107 712,859 0 0 5,833 2,065 0 0 5,833 2,065 63,321 57,431 0 0 63,321 57,431 0 0 63,321 57,431 0 0 0 0 1,054,381 1,165,889 1,054,381 1,165,889 0 0 0 0 1,054,381 1,165,889 18,721 0 18,721 0 18,721 50,032 50,055 119,467 73,114 0 0 50,032 50,055 0 0 50,032 50,055 0 0 119,467 73,114 0 0 119,467 73,114 86,889 87,086 0 0 86,889 87,086 0 0 86,889 87,086                                                                
Trading securities     0 0 0 0 1,064   1,064     1,247     1,064 1,247                                                                                                                                                                                                                     0 0 0 0 73,592   73,592     104,188     73,592 104,188                                 1,064 1,247                                           0 0 0 0 1,064   1,064     1,247     1,064 1,247                                                                                                                                                                                                                                                                          
Marketable Securities     1,054,381 1,165,889 1,336,161 1,269,334 66,374   66,374     64,406     2,456,916 2,499,629                                                                                                                                                                                                                     0 0 0 0 1,617,356   1,617,356     1,590,783     1,617,356 1,590,783                                                                                                                                                                                                                                                                                                                                                                                    
Derivative Assets 21,806 29,523 0 0 23,164 31,173 0   0     0     23,164 31,173                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
Assets at fair value     1,054,381 1,165,889 1,359,325 1,300,507 6,742,583   6,742,583     6,421,447     9,156,289 8,887,843 0 0 0 0 7,979 666,988 7,979 666,988                                                                                                                                     0 0 657,154 657,154 0 0 0 0 5,891 8,130 5,891 8,130 0 0 0 0 2,088 1,704 2,088 1,704                                                                                                                                                                                                                                                                                                                                                                                                                                        
Financial derivatives, Liabilities     30 12 98,643 149,979 390   390     691     99,063 150,682                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
Liabilities at fair value     30 12 98,643 149,979 390   390     691     99,063 150,682                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value             (390) (967) (390) (967) (532) (691) (1,225) (1,335)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         (390) [10] (967) [11] (390) [10] (967) [11] (532) [10] (691) [10] (1,225) [11] (1,335) [11]                                                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Purchases             0 0 0 0                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 0 [10] 0 [11] 0 [10] 0 [11]                                                        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Sales             0 0 0 0                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 0 [10] 0 [11] 0 [10] 0 [11]                                                        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Settlements             0 0 0 0                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 0 [10] 0 [11] 0 [10] 0 [11]                                                        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings             142 258 301 368                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 142 [10] 258 [11] 301 [10] 368 [11]                                                        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Other Comprehensive Income (Loss)             0 0 0 0                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 0 [10] 0 [11] 0 [10] 0 [11]                                                        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings             (15,057) (3,086) (17,985) (1,987)                                 (14,730) 0 (17,868) 0         0 0 0 0         121 23 317 161         121 23 317 161                                                                                                                         (448) [2] (3,109) [4] (434) [1] (2,148) [3]                 (448) (3,109) (434) (2,148)                         0 0 0 0                                           0 0 0 0                 121 [6] 23 [8] 317 [5] 161 [7]                                                                     0 0                                                                                                                                                               0 0 0 0         0 0 0 0         (14,730) 0 (17,868) 0        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss)             (79,519) 11,664 (57,609) 8,294                                 (19,463) 11,400 (29,187) 7,926         (127) 839 1,927 (506)         0 0 0 0         (127) 839 1,927 (506)                                                                                                                         0 [2] 0 [4] 0 [1] 0 [3]                 (59,929) (575) (30,349) 874                         (125) 839 1,929 (506)                                           (59,929) (575) (30,349) 874                 0 [6] 0 [8] 0 [5] 0 [7]                                                                     (2) (2)                                                                                                                                                               (889) (443) 11 315         (4,466) (4,273) (20,268) (9,109)         (14,108) 16,116 (8,930) 16,720        
Trading Securities, Unrealized Holding Loss                                                                                                                                                                                                                             $ 300 $ 2,400 $ 100 [1] $ 1,600 [3]                                                                             $ 2,762 $ 3,080                                                                                                                                                                                                                                                                                                                                                
[1] Includes unrealized losses of $0.1 million attributable to assets still held as of June 30, 2013 that are recorded in "Losses on trading assets.
[2] Includes unrealized losses of $2.4 million attributable to assets still held as of June 30, 2012 that are recorded in "Losses on trading assets.
[3] Includes unrealized losses of $1.6 million attributable to assets still held as of June 30, 2012 that are recorded in "Losses on trading assets.
[4] Includes unrealized losses of $0.3 million attributable to assets still held as of June 30, 2013 that are recorded in "Losses on trading assets.
[5] Unrealized gains are attributable to assets still held as of June 30, 2013 and are recorded in "Losses on trading assets
[6] Unrealized gains are attributable to assets still held as of June 30, 2013 and are recorded in "Losses on trading assets.
[7] Unrealized gains are attributable to assets still held as of June 30, 2012 and are recorded in "Losses on trading assets
[8] Unrealized gains are attributable to assets still held as of June 30, 2012 and are recorded in "Losses on trading assets.
[9] Fair value includes $4.3 million of an interest-only security with a notional amount of $152.4 million.
[10] Unrealized gains are attributable to liabilities still held as of June 30, 2013 and are recorded in "Gains/(losses) on financial derivatives and hedging activities.
[11] Unrealized gains are attributable to liabilities still held as of June 30, 2012 and are recorded in "Gains/(losses) on financial derivatives and hedging activities.