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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 | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning Balance | $ 7,064,077 | $ 6,015,564 | $ 6,003,211 | $ 5,508,576
Cumulative Effect from Change in Hedge Accounting |  |  |  | 487
Purchases | 349,654 | 713,702 | 1,788,097 | 1,751,973
Sales | (9,506) | (26,321) | (57,853) | (105,628)
Settlements | (254,900) | (689,721) | (726,116) | (1,134,113)
Realized and Unrealized Gains included in Income | 84,213 | (13,435) | 258,309 | (45,298)
Unrealized Losses included in Other Comprehensive Income | (22,846) | (13,287) | (54,956) | 10,505
Ending Balance | 7,210,692 | 5,986,502 | 7,210,692 | 5,986,502
USDA Securities [Member] |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning Balance | 9,201 | 10,748 | 9,999 | 13,515
Cumulative Effect from Change in Hedge Accounting |  |  |  | 0
Purchases | 9,506 | 26,321 | 57,853 | 105,628
Sales | (9,506) | (26,321) | (57,853) | (105,628)
Settlements | (307) | (508) | (1,210) | (3,302)
Realized and Unrealized Gains included in Income | 49 | (3) | 154 | 24
Unrealized Losses included in Other Comprehensive Income | 0 | 0 | 0 | 0
Ending Balance | 8,943 | 10,237 | 8,943 | 10,237
Debt Securities, Trading, Unrealized Loss |  | 9 |  | 100
Available-for-sale Securities [Member] | Investment Securities [Member] |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning Balance | 19,208 | 19,010 | 18,715 | 23,147
Cumulative Effect from Change in Hedge Accounting |  |  |  | 0
Purchases | 0 | 0 | 0 | 0
Sales | 0 | 0 | 0 | 0
Settlements | 0 | 0 | 0 | (2,137)
Realized and Unrealized Gains included in Income | 0 | 0 | 0 | (2,092)
Unrealized Losses included in Other Comprehensive Income | 0 | (49) | 493 | 43
Ending Balance | 19,208 | 18,961 | 19,208 | 18,961
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 | 7,035,668 | 5,985,806 | 5,974,497 | 5,471,914
Cumulative Effect from Change in Hedge Accounting |  |  |  | 487
Purchases | 340,148 | 687,381 | 1,730,244 | 1,646,345
Sales | 0 | 0 | 0 | 0
Settlements | (254,593) | (689,213) | (724,906) | (1,128,674)
Realized and Unrealized Gains included in Income | 84,164 | (13,432) | 258,155 | (43,230)
Unrealized Losses included in Other Comprehensive Income | (22,846) | (13,238) | (55,449) | 10,462
Ending Balance | 7,182,541 | 5,957,304 | 7,182,541 | 5,957,304
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 | 0 | 0
Cumulative Effect from Change in Hedge Accounting |  |  |  | 0
Purchases | 9,506 | 26,321 | 57,853 | 105,628
Sales | (9,506) | (26,321) | (57,853) | (105,628)
Settlements | 0 | 0 | 0 | 0
Realized and Unrealized Gains included in Income | 0 | 0 | 0 | 0
Unrealized Losses included in Other Comprehensive Income | 0 | 0 | 0 | 0
Ending Balance | 0 | 0 | 0 | 0
Trading Securities [Member] | USDA Securities [Member] |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning Balance | 9,201 | 10,748 | 9,999 | 13,515
Cumulative Effect from Change in Hedge Accounting |  |  |  | 0
Purchases | 0 | 0 | 0 | 0
Sales | 0 | 0 | 0 | 0
Settlements | (307) | (508) | (1,210) | (3,302)
Realized and Unrealized Gains included in Income | 49 | (3) | 154 | 24
Unrealized Losses included in Other Comprehensive Income | 0 | 0 | 0 | 0
Ending Balance | 8,943 | 10,237 | 8,943 | 10,237
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 | 7,035,668 | 5,985,806 | 5,974,497 | 5,471,914
Cumulative Effect from Change in Hedge Accounting |  |  |  | 487
Purchases | 340,148 | 687,381 | 1,730,244 | 1,646,345
Sales | 0 | 0 | 0 | 0
Settlements | (254,593) | (689,213) | (724,906) | (1,128,674)
Realized and Unrealized Gains included in Income | 84,164 | (13,432) | 258,155 | (43,230)
Unrealized Losses included in Other Comprehensive Income | (22,846) | (13,238) | (55,449) | 10,462
Ending Balance | 7,182,541 | 5,957,304 | 7,182,541 | 5,957,304
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 | 19,208 | 19,010 | 18,715 | 18,814
Cumulative Effect from Change in Hedge Accounting |  |  |  | 0
Purchases | 0 | 0 | 0 | 0
Sales | 0 | 0 | 0 | 0
Settlements | 0 | 0 | 0 | 0
Realized and Unrealized Gains included in Income | 0 | 0 | 0 | 0
Unrealized Losses included in Other Comprehensive Income | 0 | (49) | 493 | 147
Ending Balance | $ 19,208 | 18,961 | $ 19,208 | 18,961
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 |  |  |  | (2,137)
Realized and Unrealized Gains included in Income |  |  |  | (2,092)
Unrealized Losses included in Other Comprehensive Income |  |  |  | (104)
Ending Balance |  | $ 0 |  | $ 0

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