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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, 2019 | Mar. 31, 2018
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Beginning Balance | $ 6,003,211 | $ 5,508,576
Cumulative Effect from Change in Hedge Accounting |  | 487
Purchases | 795,260 | 689,740
Sales | (18,928) | (34,293)
Settlements | (372,289) | (292,350)
Realized and Unrealized Gains included in Income | 59,396 | (18,932)
Unrealized Gains included in Other Comprehensive Income | 3,373 | 20,847
Ending Balance | 6,470,023 | 5,874,075
USDA Securities [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Beginning Balance | 9,999 | 13,515
Cumulative Effect from Change in Hedge Accounting |  | 0
Purchases | 18,928 | 34,293
Sales | (18,928) | (34,293)
Settlements | (556) | (1,973)
Realized and Unrealized Gains included in Income | 44 | 16
Unrealized Gains included in Other Comprehensive Income | 0 | 0
Ending Balance | 9,487 | 11,558
Unrealized Gains |  | 100
Available-for-sale Securities [Member] | Investment Securities [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Beginning Balance | 18,715 | 23,147
Cumulative Effect from Change in Hedge Accounting |  | 0
Purchases | 0 | 0
Sales | 0 | 0
Settlements | 0 | (109)
Realized and Unrealized Gains included in Income | 0 | 0
Unrealized Gains included in Other Comprehensive Income | 197 | 92
Ending Balance | 18,912 | 23,130
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 | 5,974,497 | 5,471,914
Cumulative Effect from Change in Hedge Accounting |  | 487
Purchases | 776,332 | 655,447
Sales | 0 | 0
Settlements | (371,733) | (290,268)
Realized and Unrealized Gains included in Income | 59,352 | (18,948)
Unrealized Gains included in Other Comprehensive Income | 3,176 | 20,755
Ending Balance | 6,441,624 | 5,839,387
Available-for-sale Securities [Member] | USDA Securities [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Beginning Balance | 0 | 0
Cumulative Effect from Change in Hedge Accounting |  | 0
Purchases | 18,928 | 34,293
Sales | (18,928) | (34,293)
Settlements | 0 | 0
Realized and Unrealized Gains included in Income | 0 | 0
Unrealized Gains included in Other Comprehensive Income | 0 | 0
Ending Balance | 0 | 0
Trading Securities [Member] | USDA Securities [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Beginning Balance | 9,999 | 13,515
Cumulative Effect from Change in Hedge Accounting |  | 0
Purchases | 0 | 0
Sales | 0 | 0
Settlements | (556) | (1,973)
Realized and Unrealized Gains included in Income | 44 | 16
Unrealized Gains included in Other Comprehensive Income | 0 | 0
Ending Balance | 9,487 | 11,558
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 | 5,974,497 | 5,471,914
Cumulative Effect from Change in Hedge Accounting |  | 487
Purchases | 776,332 | 655,447
Sales | 0 | 0
Settlements | (371,733) | (290,268)
Realized and Unrealized Gains included in Income | 59,352 | (18,948)
Unrealized Gains included in Other Comprehensive Income | 3,176 | 20,755
Ending Balance | 6,441,624 | 5,839,387
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 | 18,715 | 18,814
Cumulative Effect from Change in Hedge Accounting |  | 0
Purchases | 0 | 0
Sales | 0 | 0
Settlements | 0 | 0
Realized and Unrealized Gains included in Income | 0 | 0
Unrealized Gains included in Other Comprehensive Income | 197 | 196
Ending Balance | $ 18,912 | 19,010
Fixed Interest Rate [Member] | Available-for-sale Securities [Member] | Collateralized Mortgage Backed Securities [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Beginning Balance |  | 4,333
Cumulative Effect from Change in Hedge Accounting |  | 0
Purchases |  | 0
Sales |  | 0
Settlements |  | (109)
Realized and Unrealized Gains included in Income |  | 0
Unrealized Gains included in Other Comprehensive Income |  | (104)
Ending Balance |  | $ 4,120

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