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Fair Value Disclosures - Unobservable Input Reconciliation (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 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 6 Months Ended 12 Months Ended 6 Months Ended 12 Months Ended 6 Months Ended 12 Months Ended 6 Months Ended 12 Months Ended 6 Months Ended 12 Months Ended 6 Months Ended 12 Months Ended 6 Months Ended 12 Months Ended 6 Months Ended 12 Months Ended 6 Months Ended 12 Months Ended 6 Months Ended 12 Months Ended 6 Months Ended 12 Months Ended 6 Months Ended 12 Months Ended 6 Months Ended 12 Months Ended 6 Months Ended 12 Months Ended 6 Months Ended 12 Months Ended 6 Months Ended 12 Months Ended 6 Months Ended 12 Months Ended 6 Months Ended 12 Months Ended 6 Months Ended 12 Months Ended 6 Months Ended 12 Months Ended 6 Months Ended 12 Months Ended 6 Months Ended 12 Months Ended
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
Dec. 31, 2012
Fair Value, Measurements, Recurring [Member]
Level 3
Jun. 30, 2013
Fair Value, Measurements, Recurring [Member]
Level 3
Derivative Financial Instruments, Liabilities [Member]
Jun. 30, 2012
Fair Value, Measurements, Recurring [Member]
Level 3
Derivative Financial Instruments, Liabilities [Member]
Jun. 30, 2013
Fair Value, Measurements, Recurring [Member]
Level 3
Derivative Financial Instruments, Liabilities [Member]
Jun. 30, 2012
Fair Value, Measurements, Recurring [Member]
Level 3
Derivative Financial Instruments, Liabilities [Member]
Jun. 30, 2013
Fair Value, Measurements, Recurring [Member]
Level 3
Available-for-sale Securities [Member]
Jun. 30, 2012
Fair Value, Measurements, Recurring [Member]
Level 3
Available-for-sale Securities [Member]
Jun. 30, 2013
Fair Value, Measurements, Recurring [Member]
Level 3
Available-for-sale Securities [Member]
Jun. 30, 2012
Fair Value, Measurements, Recurring [Member]
Level 3
Available-for-sale Securities [Member]
Jun. 30, 2013
Fair Value, Measurements, Recurring [Member]
Level 3
Trading Account Assets [Member]
Jun. 30, 2012
Fair Value, Measurements, Recurring [Member]
Level 3
Trading Account Assets [Member]
Jun. 30, 2013
Fair Value, Measurements, Recurring [Member]
Level 3
Trading Account Assets [Member]
Jun. 30, 2012
Fair Value, Measurements, Recurring [Member]
Level 3
Trading Account Assets [Member]
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
Investment Securities [Member]
Jun. 30, 2012
Fair Value, Measurements, Recurring [Member]
Level 3
Investment Securities [Member]
Jun. 30, 2013
Fair Value, Measurements, Recurring [Member]
Level 3
Investment Securities [Member]
Jun. 30, 2012
Fair Value, Measurements, Recurring [Member]
Level 3
Investment Securities [Member]
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
Jun. 30, 2013
Farmer Mac Guarantee
Fair Value, Measurements, Recurring [Member]
Level 3
Farmer Mac Guaranteed Securities [Member]
Dec. 31, 2012
Farmer Mac Guarantee
Fair Value, Measurements, Recurring [Member]
Level 3
Farmer Mac Guaranteed Securities [Member]
Jun. 30, 2013
Farmer Mac Guarantee
Fair Value, Measurements, Recurring [Member]
Level 3
Farm & Ranch Guaranteed Securities [Member]
Dec. 31, 2012
Farmer Mac Guarantee
Fair Value, Measurements, Recurring [Member]
Level 3
Farm & Ranch Guaranteed Securities [Member]
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]
Level 3
Farmer Mac Guaranteed Securities - Rural Utilities
Dec. 31, 2012
Farmer Mac Guarantee
Fair Value, Measurements, Recurring [Member]
Level 3
Farmer Mac Guaranteed Securities - Rural Utilities
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
Dec. 31, 2012
Fair Value, Measurements, Recurring [Member]
Level 3
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]
Level 3
Floating Interest Rate [Member]
Jun. 30, 2012
Auction-rate certificates backed by Government guaranteed student loans
Fair Value, Measurements, Recurring [Member]
Level 3
Floating Interest Rate [Member]
Jun. 30, 2013
Auction-rate certificates backed by Government guaranteed student loans
Fair Value, Measurements, Recurring [Member]
Level 3
Floating Interest Rate [Member]
Jun. 30, 2012
Auction-rate certificates backed by Government guaranteed student loans
Fair Value, Measurements, Recurring [Member]
Level 3
Floating Interest Rate [Member]
Dec. 31, 2012
Auction-rate certificates backed by Government guaranteed student loans
Fair Value, Measurements, Recurring [Member]
Level 3
Floating Interest Rate [Member]
Jun. 30, 2013
Asset-backed Securities [Member]
Floating Interest Rate [Member]
Dec. 31, 2012
Asset-backed Securities [Member]
Floating Interest Rate [Member]
Jun. 30, 2013
Asset-backed Securities [Member]
Fair Value, Measurements, Recurring [Member]
Level 3
Floating Interest Rate [Member]
Dec. 31, 2012
Asset-backed Securities [Member]
Fair Value, Measurements, Recurring [Member]
Level 3
Floating Interest Rate [Member]
Jun. 30, 2013
Asset-backed Securities [Member]
Fair Value, Measurements, Recurring [Member]
Level 3
Trading Account Assets [Member]
Floating Interest Rate [Member]
Jun. 30, 2012
Asset-backed Securities [Member]
Fair Value, Measurements, Recurring [Member]
Level 3
Trading Account Assets [Member]
Floating Interest Rate [Member]
Jun. 30, 2013
Asset-backed Securities [Member]
Fair Value, Measurements, Recurring [Member]
Level 3
Trading Account Assets [Member]
Floating Interest Rate [Member]
Jun. 30, 2012
Asset-backed Securities [Member]
Fair Value, Measurements, Recurring [Member]
Level 3
Trading Account Assets [Member]
Floating Interest Rate [Member]
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
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
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
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
Jun. 30, 2013
Indicative Bid Approach Valuation Technique [Member]
Fair Value, Measurements, Recurring [Member]
Auction-rate certificates backed by Government guaranteed student loans
Floating Interest Rate [Member]
Dec. 31, 2012
Indicative Bid Approach Valuation Technique [Member]
Fair Value, Measurements, Recurring [Member]
Auction-rate certificates backed by Government guaranteed student loans
Floating Interest Rate [Member]
Jun. 30, 2013
Discounted Cash Flows Approach Valuation Technique
Fair Value, Measurements, Recurring [Member]
Collateralized Mortgage Backed Securities [Member]
Floating Interest Rate [Member]
Jun. 30, 2013
Discounted Cash Flows Approach Valuation Technique
Fair Value, Measurements, Recurring [Member]
Level 3
Asset-backed Securities [Member]
Floating Interest Rate [Member]
Dec. 31, 2012
Discounted Cash Flows Approach Valuation Technique
Fair Value, Measurements, Recurring [Member]
Level 3
Asset-backed Securities [Member]
Floating Interest Rate [Member]
Jun. 30, 2013
Discounted Cash Flows Approach Valuation Technique
Farmer Mac Guarantee
Fair Value, Measurements, Recurring [Member]
Farm & Ranch Guaranteed Securities [Member]
Dec. 31, 2012
Discounted Cash Flows Approach Valuation Technique
Farmer Mac Guarantee
Fair Value, Measurements, Recurring [Member]
Farm & Ranch Guaranteed Securities [Member]
Jun. 30, 2013
Discounted Cash Flows Approach Valuation Technique
Farmer Mac Guarantee
Fair Value, Measurements, Recurring [Member]
Dec. 31, 2012
Discounted Cash Flows Approach Valuation Technique
Farmer Mac Guarantee
Fair Value, Measurements, Recurring [Member]
Jun. 30, 2013
Discounted Cash Flows Approach Valuation Technique
Farmer Mac Guarantee
Fair Value, Measurements, Recurring [Member]
Farmer Mac Guaranteed Securities - Rural Utilities
Dec. 31, 2012
Discounted Cash Flows Approach Valuation Technique
Farmer Mac Guarantee
Fair Value, Measurements, Recurring [Member]
Farmer Mac Guaranteed Securities - Rural Utilities
Jun. 30, 2013
Minimum [Member]
Indicative Bid Approach Valuation Technique [Member]
Fair Value, Measurements, Recurring [Member]
Level 3
Auction-rate certificates backed by Government guaranteed student loans
Floating Interest Rate [Member]
Dec. 31, 2012
Minimum [Member]
Indicative Bid Approach Valuation Technique [Member]
Fair Value, Measurements, Recurring [Member]
Level 3
Auction-rate certificates backed by Government guaranteed student loans
Floating Interest Rate [Member]
Jun. 30, 2013
Minimum [Member]
Discounted Cash Flows Approach Valuation Technique
Fair Value, Measurements, Recurring [Member]
Level 3
Derivative Financial Instruments, Liabilities [Member]
Dec. 31, 2012
Minimum [Member]
Discounted Cash Flows Approach Valuation Technique
Fair Value, Measurements, Recurring [Member]
Level 3
Derivative Financial Instruments, Liabilities [Member]
Jun. 30, 2013
Minimum [Member]
Discounted Cash Flows Approach Valuation Technique
Fair Value, Measurements, Recurring [Member]
Level 3
Asset-backed Securities [Member]
Floating Interest Rate [Member]
Dec. 31, 2012
Minimum [Member]
Discounted Cash Flows Approach Valuation Technique
Fair Value, Measurements, Recurring [Member]
Level 3
Asset-backed Securities [Member]
Floating Interest Rate [Member]
Jun. 30, 2013
Minimum [Member]
Discounted Cash Flows Approach Valuation Technique
Farmer Mac Guarantee
Fair Value, Measurements, Recurring [Member]
Level 3
Farm & Ranch Guaranteed Securities [Member]
Dec. 31, 2012
Minimum [Member]
Discounted Cash Flows Approach Valuation Technique
Farmer Mac Guarantee
Fair Value, Measurements, Recurring [Member]
Level 3
Farm & Ranch Guaranteed Securities [Member]
Jun. 30, 2013
Minimum [Member]
Discounted Cash Flows Approach Valuation Technique
Farmer Mac Guarantee
Fair Value, Measurements, Recurring [Member]
Level 3
Dec. 31, 2012
Minimum [Member]
Discounted Cash Flows Approach Valuation Technique
Farmer Mac Guarantee
Fair Value, Measurements, Recurring [Member]
Level 3
Jun. 30, 2013
Minimum [Member]
Discounted Cash Flows Approach Valuation Technique
Farmer Mac Guarantee
Fair Value, Measurements, Recurring [Member]
Level 3
Farmer Mac Guaranteed Securities - Rural Utilities
Dec. 31, 2012
Minimum [Member]
Discounted Cash Flows Approach Valuation Technique
Farmer Mac Guarantee
Fair Value, Measurements, Recurring [Member]
Level 3
Farmer Mac Guaranteed Securities - Rural Utilities
Jun. 30, 2013
Minimum [Member]
Discounted Cash Flows Approach Valuation Technique
Fair Value, Measurements, Recurring [Member]
Level 3
Dec. 31, 2012
Minimum [Member]
Discounted Cash Flows Approach Valuation Technique
Fair Value, Measurements, Recurring [Member]
Level 3
Jun. 30, 2013
Maximum [Member]
Indicative Bid Approach Valuation Technique [Member]
Fair Value, Measurements, Recurring [Member]
Level 3
Auction-rate certificates backed by Government guaranteed student loans
Floating Interest Rate [Member]
Dec. 31, 2012
Maximum [Member]
Indicative Bid Approach Valuation Technique [Member]
Fair Value, Measurements, Recurring [Member]
Level 3
Auction-rate certificates backed by Government guaranteed student loans
Floating Interest Rate [Member]
Jun. 30, 2013
Maximum [Member]
Discounted Cash Flows Approach Valuation Technique
Fair Value, Measurements, Recurring [Member]
Level 3
Derivative Financial Instruments, Liabilities [Member]
Dec. 31, 2012
Maximum [Member]
Discounted Cash Flows Approach Valuation Technique
Fair Value, Measurements, Recurring [Member]
Level 3
Derivative Financial Instruments, Liabilities [Member]
Jun. 30, 2013
Maximum [Member]
Discounted Cash Flows Approach Valuation Technique
Fair Value, Measurements, Recurring [Member]
Level 3
Asset-backed Securities [Member]
Floating Interest Rate [Member]
Dec. 31, 2012
Maximum [Member]
Discounted Cash Flows Approach Valuation Technique
Fair Value, Measurements, Recurring [Member]
Level 3
Asset-backed Securities [Member]
Floating Interest Rate [Member]
Jun. 30, 2013
Maximum [Member]
Discounted Cash Flows Approach Valuation Technique
Farmer Mac Guarantee
Fair Value, Measurements, Recurring [Member]
Level 3
Farm & Ranch Guaranteed Securities [Member]
Dec. 31, 2012
Maximum [Member]
Discounted Cash Flows Approach Valuation Technique
Farmer Mac Guarantee
Fair Value, Measurements, Recurring [Member]
Level 3
Farm & Ranch Guaranteed Securities [Member]
Jun. 30, 2013
Maximum [Member]
Discounted Cash Flows Approach Valuation Technique
Farmer Mac Guarantee
Fair Value, Measurements, Recurring [Member]
Level 3
Dec. 31, 2012
Maximum [Member]
Discounted Cash Flows Approach Valuation Technique
Farmer Mac Guarantee
Fair Value, Measurements, Recurring [Member]
Level 3
Jun. 30, 2013
Maximum [Member]
Discounted Cash Flows Approach Valuation Technique
Farmer Mac Guarantee
Fair Value, Measurements, Recurring [Member]
Level 3
Farmer Mac Guaranteed Securities - Rural Utilities
Dec. 31, 2012
Maximum [Member]
Discounted Cash Flows Approach Valuation Technique
Farmer Mac Guarantee
Fair Value, Measurements, Recurring [Member]
Level 3
Farmer Mac Guaranteed Securities - Rural Utilities
Jun. 30, 2013
Maximum [Member]
Discounted Cash Flows Approach Valuation Technique
Fair Value, Measurements, Recurring [Member]
Level 3
Dec. 31, 2012
Maximum [Member]
Discounted Cash Flows Approach Valuation Technique
Fair Value, Measurements, Recurring [Member]
Level 3
Jun. 30, 2013
Weighted Average
Indicative Bid Approach Valuation Technique [Member]
Fair Value, Measurements, Recurring [Member]
Level 3
Auction-rate certificates backed by Government guaranteed student loans
Floating Interest Rate [Member]
Dec. 31, 2012
Weighted Average
Indicative Bid Approach Valuation Technique [Member]
Fair Value, Measurements, Recurring [Member]
Level 3
Auction-rate certificates backed by Government guaranteed student loans
Floating Interest Rate [Member]
Jun. 30, 2013
Weighted Average
Discounted Cash Flows Approach Valuation Technique
Fair Value, Measurements, Recurring [Member]
Level 3
Derivative Financial Instruments, Liabilities [Member]
Dec. 31, 2012
Weighted Average
Discounted Cash Flows Approach Valuation Technique
Fair Value, Measurements, Recurring [Member]
Level 3
Derivative Financial Instruments, Liabilities [Member]
Jun. 30, 2013
Weighted Average
Discounted Cash Flows Approach Valuation Technique
Fair Value, Measurements, Recurring [Member]
Level 3
Asset-backed Securities [Member]
Floating Interest Rate [Member]
Dec. 31, 2012
Weighted Average
Discounted Cash Flows Approach Valuation Technique
Fair Value, Measurements, Recurring [Member]
Level 3
Asset-backed Securities [Member]
Floating Interest Rate [Member]
Jun. 30, 2013
Weighted Average
Discounted Cash Flows Approach Valuation Technique
Farmer Mac Guarantee
Fair Value, Measurements, Recurring [Member]
Level 3
Farm & Ranch Guaranteed Securities [Member]
Dec. 31, 2012
Weighted Average
Discounted Cash Flows Approach Valuation Technique
Farmer Mac Guarantee
Fair Value, Measurements, Recurring [Member]
Level 3
Farm & Ranch Guaranteed Securities [Member]
Jun. 30, 2013
Weighted Average
Discounted Cash Flows Approach Valuation Technique
Farmer Mac Guarantee
Fair Value, Measurements, Recurring [Member]
Level 3
Dec. 31, 2012
Weighted Average
Discounted Cash Flows Approach Valuation Technique
Farmer Mac Guarantee
Fair Value, Measurements, Recurring [Member]
Level 3
Jun. 30, 2013
Weighted Average
Discounted Cash Flows Approach Valuation Technique
Farmer Mac Guarantee
Fair Value, Measurements, Recurring [Member]
Level 3
Farmer Mac Guaranteed Securities - Rural Utilities
Dec. 31, 2012
Weighted Average
Discounted Cash Flows Approach Valuation Technique
Farmer Mac Guarantee
Fair Value, Measurements, Recurring [Member]
Level 3
Farmer Mac Guaranteed Securities - Rural Utilities
Jun. 30, 2013
Weighted Average
Discounted Cash Flows Approach Valuation Technique
Fair Value, Measurements, Recurring [Member]
Level 3
Dec. 31, 2012
Weighted Average
Discounted Cash Flows Approach Valuation Technique
Fair Value, Measurements, Recurring [Member]
Level 3
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                                                                                                                                                                                                                                                                        
Available-for-sale Securities, Fair Value Disclosure $ 65,310   $ 65,310   $ 63,159                                         $ 5,058,853 $ 4,766,258         $ 5,058,853 $ 4,766,258 $ 3,498,474 $ 3,426,489 $ 25,794 $ 26,681 $ 1,534,585 $ 1,313,088         $ 1,543,764   $ 1,543,764   $ 1,486,595 $ 65,088 $ 63,159 $ 65,088   $ 65,088   $ 63,159 $ 158,292 $ 151,044 $ 0 $ 0                                         $ 65,088 $ 63,159 $ 222     $ 3,498,474 $ 3,426,489 $ 25,794 $ 26,681 $ 1,534,585 $ 1,313,088                                                                                    
Fair Value Inputs, Range of Offered Quotes                                                                                                                                                                                     82.00% 82.00%                         92.00% 90.00%                         87.80% 85.00%                        
Trading Securities, Unrealized Gains                                                                                                               0 0                                                                                                                                                      
Trading Securities, Unrealized Holding Loss                                   300 2,400 100 [1] 1,600 [2]                                                                     2,762 3,080                                                                                                                                                      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                                                                                                                                                                                                                                                                        
Beginning Balance, Asset 6,823,086 5,963,474 6,421,447 5,843,186           65,446 58,868 63,159 60,213 1,129 1,646 1,247 1,796         66,575 60,514 64,406 62,009     5,100,080 4,389,861 4,766,258 4,289,272                 87,271 [3] 184,397 [4] 104,188 [1] 212,359 [2] 1,656,431 1,513,099 1,590,783 1,491,905       65,213 58,868 63,159 60,213           1,129 [5] 1,646 [6] 1,247 [7] 1,796 [8] 1,569,160 1,328,702 1,486,595 1,279,546 3,528,520 3,008,223 3,426,489 2,807,627 27,198 36,129 26,681 35,599 1,544,362 1,345,509 1,313,088 1,446,046                                                                                                          
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases 310,897 365,613 858,317 667,338           0 0 233 0 0 0 0 0         0 0 233 0     200,000 205,327 625,000 405,327                 0 [3] 0 [4] 0 [1] 0 [2] 110,897 160,286 233,084 262,011       0 0 0 0           0 [5] 0 [6] 0 [7] 0 [8] 110,897 160,286 233,084 262,011 200,000 200,000 300,000 400,000 0 5,327 0 5,327 0 0 325,000 0                                                                                                          
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales 0 (5,327) 0 (5,327)           0 0 0 0 0 0 0 0         0 0 0 0     0 (5,327) 0 (5,327)                 0 [3] 0 [4] 0 [1] 0 [2] 0 0 0 0       0 0 0 0           0 [5] 0 [6] 0 [7] 0 [8] 0 0 0 0 0 0 0 0 0 (5,327) 0 (5,327) 0 0 0 0                                                                                                          
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements (296,824) (261,271) (461,587) (440,437)           (9) 0 (9) 0 (186) (239) (500) (527)         (195) (239) (509) (527)     (207,034) (156,794) (285,350) (252,731)                 (13,231) [3] (34,463) [4] (30,162) [1] (63,386) [2] (89,595) (104,238) (175,728) (187,179)       0 0 0 0           (186) [5] (239) [6] (500) [7] (527) [8] (76,364) (69,775) (145,566) (123,793) (201,208) (1,007) (201,217) (1,015) (515) (5,787) (898) (6,015) (5,311) (150,000) (83,235) (245,701)                                                                                                          
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings (15,057) (3,086) (17,985) (1,987)           0 0 0 0 121 23 317 161         121 23 317 161     (14,730) 0 (17,868) 0                 (448) [3] (3,109) [4] (434) [1] (2,148) [2] (448) (3,109) (434) (2,148)       0 0 0 0           121 [5] 23 [6] 317 [7] 161 [8] 0 0 0 0 (14,730) 0 (17,868) 0 0 0 0 0 0 0 0 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           (127) 839 1,927 (506) 0 0 0 0         (127) 839 1,927 (506)     (19,463) 11,400 (29,187) 7,926                 0 [3] 0 [4] 0 [1] 0 [2] (59,929) (575) (30,349) 874       (125) 839 1,929 (506)           0 [5] 0 [6] 0 [7] 0 [8] (59,929) (575) (30,349) 874 (14,108) 16,116 (8,930) 16,720 (889) (443) 11 315 (4,466) (4,273) (20,268) (9,109)                                                                                                          
Ending Balance, Asset 6,742,583 6,071,067 6,742,583 6,071,067           65,310 59,707 65,310 59,707 1,064 1,430 1,064 1,430         66,374 61,137 66,374 61,137     5,058,853 4,444,467 5,058,853 4,444,467                 73,592 [1],[3] 146,825 [2],[4] 73,592 [1],[3] 146,825 [2],[4] 1,617,356 1,565,463 1,617,356 1,565,463       65,088 59,707 65,088 59,707           1,064 [5],[7] 1,430 [6],[8] 1,064 [5],[7] 1,430 [6],[8] 1,543,764 1,418,638 1,543,764 1,418,638 3,498,474 3,223,332 3,498,474 3,223,332 25,794 29,899 25,794 29,899 1,534,585 1,191,236 1,534,585 1,191,236                                                                                                          
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                                                                                                                                                                                                                                                                        
Beginning Balance, Liability (532) (1,225) (691) (1,335)   (532) [9] (1,225) [10] (691) [9] (1,335) [10]                                                                                                                                                                                                                                                      
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Purchases 0 0 0 0   0 [9] 0 [10] 0 [9] 0 [10]                                                                                                                                                                                                                                                      
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Sales 0 0 0 0   0 [9] 0 [10] 0 [9] 0 [10]                                                                                                                                                                                                                                                      
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Settlements 0 0 0 0   0 [9] 0 [10] 0 [9] 0 [10]                                                                                                                                                                                                                                                      
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings 142 258 301 368   142 [9] 258 [10] 301 [9] 368 [10]                                                                                                                                                                                                                                                      
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Other Comprehensive Income (Loss) 0 0 0 0   0 [9] 0 [10] 0 [9] 0 [10]                                                                                                                                                                                                                                                      
Ending Balance, Liability $ (390) $ (967) $ (390) $ (967)   $ (390) [9] $ (967) [10] $ (390) [9] $ (967) [10]                                                                                                                                                                                                                                                      
Fair Value Inputs, discount rate                                                                                                                                                                                         0.80% 1.00% 11.80% 12.40% 0.90% 1.10% 0.90% 1.00% 0.80% 0.80% 1.20% 1.40%     2.70% 3.00% 19.90% 19.70% 3.60% 3.40% 3.30% 3.40% 3.20% 2.90% 5.30% 5.30%     1.50% 1.70% 16.00% 16.20% 1.70% 1.60% 2.10% 2.10% 1.60% 1.60% 3.30% 3.40%
Fair Value Inputs, Constant Prepayment Rate                                                                                                                                                                     10.00% 10.00%                 12.00% 11.00%         8.00% 8.00%     0.00% 0.00%     14.00% 19.00%         15.00% 17.00%     25.00% 26.00%     13.00% 16.00%         13.00% 14.00%     7.00% 10.00%
[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 $1.6 million attributable to assets still held as of June 30, 2012 that are recorded in "Losses on trading assets.
[3] 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.
[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, 2012 and are recorded in "Losses on trading assets.
[7] Unrealized gains are attributable to assets still held as of June 30, 2013 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] 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.
[10] 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.