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Fair Value Disclosures - Unobservable Input Reconciliation (Details) - Fair Value, Inputs, Level 3 [Member] - Fair Value, Measurements, Recurring [Member] - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning Balance $ 5,284,591,000 $ 6,518,500,000 $ 4,891,803,000 $ 6,115,339,000
Transfers In 0   7,041,000  
Purchases 247,794,000 297,590,000 819,910,000 1,312,089,000
Sales (53,506,000) (19,014,000) (86,095,000) (49,468,000)
Settlements (167,665,000) (118,819,000) (331,388,000) (718,605,000)
Realized and Unrealized Gains/(Losses) included in Income 9,550,000 13,532,000 6,253,000 38,193,000
Unrealized Gains/(Losses) included in Other Comprehen-sive Income 1,261,000 49,799,000 14,501,000 44,040,000
Ending Balance 5,322,025,000 6,741,588,000 5,322,025,000 6,741,588,000
Investment Securities [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning Balance   18,113,000   45,415,000
Purchases   0   0
Sales   0   (26,806,000)
Settlements   (120,000)   (326,000)
Realized and Unrealized Gains/(Losses) included in Income   18,000   122,000
Unrealized Gains/(Losses) included in Other Comprehen-sive Income   0   (394,000)
Ending Balance   18,011,000   18,011,000
USDA Securities [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Trading Securities, Unrealized Gains 100,000 300,000 7,000 600,000
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning Balance 18,602,000 1,934,883,000 20,388,000 1,917,319,000
Transfers In 0   0  
Purchases 53,506,000 129,645,000 86,095,000 228,613,000
Sales (53,506,000) (19,014,000) (86,095,000) (22,662,000)
Settlements (2,306,000) (99,762,000) (4,010,000) (186,314,000)
Realized and Unrealized Gains/(Losses) included in Income (2,000) 377,000 (84,000) 636,000
Unrealized Gains/(Losses) included in Other Comprehen-sive Income 0 46,417,000 0 54,954,000
Ending Balance 16,294,000 1,992,546,000 16,294,000 1,992,546,000
Available-for-sale Securities [Member] | Investment Securities [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning Balance 22,943,000 17,730,000 17,730,000 44,924,000
Transfers In 0   7,041,000  
Purchases 0 0 0 0
Sales 0 0 0 (26,806,000)
Settlements (111,000) 0 (223,000) 0
Realized and Unrealized Gains/(Losses) included in Income 0 0 0 6,000
Unrealized Gains/(Losses) included in Other Comprehen-sive Income 337,000 0 (1,379,000) (394,000)
Ending Balance 23,169,000 17,730,000 23,169,000 17,730,000
Available-for-sale Securities [Member] | Farmer Mac Guaranteed Securities [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning Balance 5,243,046,000 4,565,504,000 4,853,685,000 4,152,605,000
Transfers In 0   0  
Purchases 194,288,000 167,945,000 733,815,000 1,083,476,000
Sales 0 0 0 0
Settlements (165,248,000) (18,937,000) (327,155,000) (531,965,000)
Realized and Unrealized Gains/(Losses) included in Income 9,552,000 13,137,000 6,337,000 37,435,000
Unrealized Gains/(Losses) included in Other Comprehen-sive Income 924,000 3,382,000 15,880,000 (10,520,000)
Ending Balance 5,282,562,000 4,731,031,000 5,282,562,000 4,731,031,000
Available-for-sale Securities [Member] | USDA Securities [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning Balance 0 1,908,014,000 0 1,888,344,000
Transfers In 0   0  
Purchases 53,506,000 129,645,000 86,095,000 228,613,000
Sales (53,506,000) (19,014,000) (86,095,000) (22,662,000)
Settlements 0 (97,303,000) 0 (181,490,000)
Realized and Unrealized Gains/(Losses) included in Income 0 0 0 0
Unrealized Gains/(Losses) included in Other Comprehen-sive Income 0 46,417,000 0 54,954,000
Ending Balance 0 1,967,759,000 0 1,967,759,000
Trading Securities [Member] | Investment Securities [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning Balance   383,000   491,000
Purchases   0   0
Sales   0   0
Settlements   (120,000)   (326,000)
Realized and Unrealized Gains/(Losses) included in Income   18,000   116,000
Unrealized Gains/(Losses) included in Other Comprehen-sive Income   0   0
Ending Balance   281,000   281,000
Trading Securities [Member] | USDA Securities [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning Balance 18,602,000 26,869,000 20,388,000 [1] 28,975,000
Transfers In 0   0  
Purchases 0 0 0 0
Sales 0 0 0 0
Settlements (2,306,000) (2,459,000) (4,010,000) (4,824,000)
Realized and Unrealized Gains/(Losses) included in Income (2,000) [1] 377,000 [2] (84,000) [1] 636,000 [2]
Unrealized Gains/(Losses) included in Other Comprehen-sive Income 0 0 0 0
Ending Balance 16,294,000 [1] 24,787,000 16,294,000 [1] 24,787,000
Institutional Credit [Member] | Available-for-sale Securities [Member] | Farmer Mac Guaranteed Securities [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning Balance 5,243,046,000 4,534,810,000 4,853,685,000 [1] 4,121,244,000
Transfers In 0   0  
Purchases 194,288,000 163,845,000 733,815,000 1,079,376,000
Sales 0 0 0 0
Settlements (165,248,000) (16,699,000) (327,155,000) (529,229,000)
Realized and Unrealized Gains/(Losses) included in Income 9,552,000 13,137,000 6,337,000 37,435,000
Unrealized Gains/(Losses) included in Other Comprehen-sive Income 924,000 2,491,000 15,880,000 (11,242,000)
Ending Balance 5,282,562,000 [1] 4,697,584,000 5,282,562,000 [1] 4,697,584,000
USDA Guarantees [Member] | Available-for-sale Securities [Member] | Farmer Mac Guaranteed Securities [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning Balance   30,694,000   31,361,000
Purchases   4,100,000   4,100,000
Sales   0   0
Settlements   (2,238,000)   (2,736,000)
Realized and Unrealized Gains/(Losses) included in Income   0   0
Unrealized Gains/(Losses) included in Other Comprehen-sive Income   891,000   722,000
Ending Balance   33,447,000   33,447,000
Floating Interest Rate [Member] | Available-for-sale Securities [Member] | Floating rate auction-rate certificates backed by Government guaranteed student loans        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning Balance 18,124,000 17,730,000 17,730,000 44,924,000
Transfers In 0   0  
Purchases 0 0 0 0
Sales 0 0 0 (26,806,000)
Settlements 0 0 0 0
Realized and Unrealized Gains/(Losses) included in Income 0 0 0 6,000
Unrealized Gains/(Losses) included in Other Comprehen-sive Income 394,000 0 788,000 (394,000)
Ending Balance 18,518,000 17,730,000 18,518,000 17,730,000
Floating Interest Rate [Member] | Trading Securities [Member] | Asset-backed Securities [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning Balance   383,000   491,000
Purchases   0   0
Sales   0   0
Settlements [3]   (120,000)   (326,000)
Realized and Unrealized Gains/(Losses) included in Income   18,000   116,000
Unrealized Gains/(Losses) included in Other Comprehen-sive Income   0   0
Ending Balance   $ 281,000   $ 281,000
Fixed Interest Rate [Member] | Available-for-sale Securities [Member] | Government/GSE Guaranteed Mortgage Backed Securities [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning Balance 4,819,000   0  
Transfers In 0   7,041,000  
Purchases 0   0  
Sales 0   0  
Settlements (111,000)   (223,000)  
Realized and Unrealized Gains/(Losses) included in Income 0   0  
Unrealized Gains/(Losses) included in Other Comprehen-sive Income (57,000)   (2,167,000)  
Ending Balance $ 4,651,000   $ 4,651,000  
[1] Includes unrealized gains of $0.1 million attributable to assets still held as of June 30, 2017 that are recorded in "(Losses)/gains on trading securities."
[2] Includes unrealized gains of $0.3 million attributable to assets still held as of June 30, 2016 that are recorded in "(Losses)/gains on trading securities."
[3] Unrealized gains are attributable to assets still held as of June 30, 2016 and are recorded in "(Losses)/gains on trading securities."