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Fair Value Disclosures - Unobservable Input Reconciliation (Details) - Fair Value, Inputs, Level 3 [Member] - Fair Value, Measurements, Recurring [Member] - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning Balance $ 6,115,339 $ 5,472,078
Purchases 1,014,505 304,101
Sales (30,454) 0
Settlements (599,792) (129,726)
Realized and Unrealized Gains/(Losses) included in Income 24,661 9,239
Unrealized Gains/(Losses) included in Other Comprehen-sive Income (5,759) 59,971
Ending Balance 6,518,500 5,715,663
Investment Securities [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning Balance 45,415 41,265
Purchases 0 0
Sales (26,806) 0
Settlements (206) (247)
Realized and Unrealized Gains/(Losses) included in Income 104 196
Unrealized Gains/(Losses) included in Other Comprehen-sive Income (394) (197)
Ending Balance 18,113 41,017
USDA Securities [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Trading Securities, Unrealized Gains 200 200
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning Balance 1,917,319 1,771,532
Purchases 98,974 89,186
Sales (3,648) 0
Settlements (86,558) (67,074)
Realized and Unrealized Gains/(Losses) included in Income 259 166
Unrealized Gains/(Losses) included in Other Comprehen-sive Income 8,537 38,627
Ending Balance 1,934,883 1,832,437
Available-for-sale Securities [Member] | Investment Securities [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning Balance 44,924 40,576
Purchases 0 0
Sales (26,806) 0
Settlements 0 0
Realized and Unrealized Gains/(Losses) included in Income 6 0
Unrealized Gains/(Losses) included in Other Comprehen-sive Income (394) (197)
Ending Balance 17,730 40,379
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 4,152,605 3,659,281
Purchases 915,531 214,915
Sales 0 0
Settlements (513,028) (62,405)
Realized and Unrealized Gains/(Losses) included in Income 24,298 8,877
Unrealized Gains/(Losses) included in Other Comprehen-sive Income (13,902) 21,541
Ending Balance 4,565,504 3,842,209
Available-for-sale Securities [Member] | USDA Securities [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning Balance 1,888,344 1,731,222
Purchases 98,974 89,186
Sales (3,648) 0
Settlements (84,193) (64,191)
Realized and Unrealized Gains/(Losses) included in Income 0 0
Unrealized Gains/(Losses) included in Other Comprehen-sive Income 8,537 38,627
Ending Balance 1,908,014 1,794,844
Trading Securities [Member] | Investment Securities [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning Balance 491 689
Purchases 0 0
Sales 0 0
Settlements (206) (247)
Realized and Unrealized Gains/(Losses) included in Income 98 196
Unrealized Gains/(Losses) included in Other Comprehen-sive Income 0 0
Ending Balance 383 638
Trading Securities [Member] | USDA Securities [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning Balance 28,975 40,310
Purchases 0 0
Sales 0 0
Settlements (2,365) (2,883)
Realized and Unrealized Gains/(Losses) included in Income 259 166
Unrealized Gains/(Losses) included in Other Comprehen-sive Income 0 0
Ending Balance 26,869 [1] 37,593 [2]
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 4,121,244 3,631,662
Purchases 915,531 214,915
Sales 0 0
Settlements (512,530) (57,753)
Realized and Unrealized Gains/(Losses) included in Income 24,298 8,877
Unrealized Gains/(Losses) included in Other Comprehen-sive Income (13,733) 21,003
Ending Balance 4,534,810 [1] 3,818,704
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 31,361 27,619
Purchases 0 0
Sales 0 0
Settlements (498) (4,652)
Realized and Unrealized Gains/(Losses) included in Income 0 0
Unrealized Gains/(Losses) included in Other Comprehen-sive Income (169) 538
Ending Balance 30,694 23,505
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 44,924 40,576
Purchases 0 0
Sales (26,806) 0
Settlements 0 0
Realized and Unrealized Gains/(Losses) included in Income 6 0
Unrealized Gains/(Losses) included in Other Comprehen-sive Income (394) (197)
Ending Balance 17,730 40,379
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 491 689 [3]
Purchases 0 0 [3]
Sales 0 0 [3]
Settlements (206) (247) [3]
Realized and Unrealized Gains/(Losses) included in Income 98 196 [3]
Unrealized Gains/(Losses) included in Other Comprehen-sive Income 0 0 [3]
Ending Balance [3] $ 383 $ 638
[1] Includes unrealized gains of $0.2 million attributable to assets still held as of March 31, 2016 that are recorded in "Gains on trading securities."
[2] Includes unrealized gains of $0.2 million attributable to assets still held as of March 31, 2015 that are recorded in "Gains on trading securities."
[3] Unrealized gains are attributable to assets still held as of March 31, 2016 and are recorded in "Gains on trading securities."