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Financial Derivatives - Schedule of Net Income/(Expense) Recognized (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Derivative Instruments, Gain (Loss) [Line Items] |  |
Interest Income Farmer Mac Guaranteed Securities and USDA Securities | $ 85,411 | $ 62,430
Interest Income Loans | 51,397 | 45,653
Total Interest Expense | (114,916) | (76,317)
Losses on financial derivatives | (360) | (3,850)
Total | 21,532 | 27,916
Fair Value Hedging [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Recognized on hedged items | 67,392 | (14,383)
Gains/(losses) on fair value hedging relationships | (2,699) | 2,838
Cash Flow Hedging [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Discount amortization recognized on hedged items | (1) | (2)
Interest settlements reclassified from AOCI into net income on derivatives | 481 | (267)
Recognized on hedged items | (2,688) | (1,780)
Expense recognized on cash flow hedges | (2,208) | (2,049)
Designated as Hedging Instrument [Member] | Fair Value Hedging [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Recognized on hedged items | 19,198 | 7,096
Discount amortization recognized on hedged items | (149) | (155)
Not Designated as Hedging Instrument [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Losses on financial derivatives | (360) | (3,850)
Interest Income [Member] | Fair Value Hedging [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Recognized on hedged items | 59,352 | (18,948)
Gains/(losses) on fair value hedging relationships | 365 | 1,501
Interest Income [Member] | Cash Flow Hedging [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Discount amortization recognized on hedged items | 0 | 0
Interest settlements reclassified from AOCI into net income on derivatives | 0 | 0
Recognized on hedged items | 0 | 0
Expense recognized on cash flow hedges | 0 | 0
Interest Income [Member] | Designated as Hedging Instrument [Member] | Fair Value Hedging [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Recognized on hedged items | 24,565 | 13,597
Discount amortization recognized on hedged items | 0 | 0
Interest Income [Member] | Not Designated as Hedging Instrument [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Losses on financial derivatives | 0 | 0
Loans and Finance Receivables [Member] | Fair Value Hedging [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Recognized on hedged items | 16,237 | (6,572)
Gains/(losses) on fair value hedging relationships | (3,845) | (153)
Loans and Finance Receivables [Member] | Cash Flow Hedging [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Discount amortization recognized on hedged items | 0 | 0
Interest settlements reclassified from AOCI into net income on derivatives | 0 | 0
Recognized on hedged items | 0 | 0
Expense recognized on cash flow hedges | 0 | 0
Loans and Finance Receivables [Member] | Designated as Hedging Instrument [Member] | Fair Value Hedging [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Recognized on hedged items | 4,555 | 1,414
Discount amortization recognized on hedged items | 0 | 0
Loans and Finance Receivables [Member] | Not Designated as Hedging Instrument [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Losses on financial derivatives | 0 | 0
Interest Expense [Member] | Fair Value Hedging [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Recognized on hedged items | (8,197) | 11,137
Gains/(losses) on fair value hedging relationships | 781 | 1,490
Interest Expense [Member] | Cash Flow Hedging [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Discount amortization recognized on hedged items | (1) | (2)
Interest settlements reclassified from AOCI into net income on derivatives | 481 | (267)
Recognized on hedged items | (2,688) | (1,780)
Expense recognized on cash flow hedges | (2,208) | (2,049)
Interest Expense [Member] | Designated as Hedging Instrument [Member] | Fair Value Hedging [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Recognized on hedged items | (9,922) | (7,915)
Discount amortization recognized on hedged items | (149) | (155)
Interest Expense [Member] | Not Designated as Hedging Instrument [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Losses on financial derivatives | 0 | 0
Gain (Loss) on Derivative Instruments [Member] | Fair Value Hedging [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Recognized on hedged items | 0 | 0
Gains/(losses) on fair value hedging relationships | 0 | 0
Gain (Loss) on Derivative Instruments [Member] | Cash Flow Hedging [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Discount amortization recognized on hedged items | 0 | 0
Interest settlements reclassified from AOCI into net income on derivatives | 0 | 0
Recognized on hedged items | 0 | 0
Expense recognized on cash flow hedges | 0 | 0
Gain (Loss) on Derivative Instruments [Member] | Designated as Hedging Instrument [Member] | Fair Value Hedging [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Recognized on hedged items | 0 | 0
Discount amortization recognized on hedged items | 0 | 0
Gain (Loss) on Derivative Instruments [Member] | Not Designated as Hedging Instrument [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Losses on financial derivatives | (360) | (3,850)
Interest Rate Swap [Member] | Fair Value Hedging [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Recognized on derivatives | (1,690) | (1,491)
Income/(expense) related to interest settlements on fair value hedging relationships | 17,359 | 5,450
Recognized on derivatives | (70,091) | 17,221
Interest Rate Swap [Member] | Not Designated as Hedging Instrument [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Total Interest Expense | (2,300) | (1,987)
Losses on financial derivatives | 2,168 | (2,088)
Interest Rate Swap [Member] | Interest Income [Member] | Fair Value Hedging [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Recognized on derivatives | 1,550 | (1,488)
Income/(expense) related to interest settlements on fair value hedging relationships | 26,115 | 12,109
Recognized on derivatives | (58,987) | 20,449
Interest Rate Swap [Member] | Interest Income [Member] | Not Designated as Hedging Instrument [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Total Interest Expense | 0 | 0
Losses on financial derivatives | 0 | 0
Interest Rate Swap [Member] | Loans and Finance Receivables [Member] | Fair Value Hedging [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Recognized on derivatives | (22) | (297)
Income/(expense) related to interest settlements on fair value hedging relationships | 4,533 | 1,117
Recognized on derivatives | (20,082) | 6,419
Interest Rate Swap [Member] | Loans and Finance Receivables [Member] | Not Designated as Hedging Instrument [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Total Interest Expense | 0 | 0
Losses on financial derivatives | 0 | 0
Interest Rate Swap [Member] | Interest Expense [Member] | Fair Value Hedging [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Recognized on derivatives | (3,218) | 294
Income/(expense) related to interest settlements on fair value hedging relationships | (13,289) | (7,776)
Recognized on derivatives | 8,978 | (9,647)
Interest Rate Swap [Member] | Interest Expense [Member] | Not Designated as Hedging Instrument [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Total Interest Expense | 0 | 0
Losses on financial derivatives | 0 | 0
Interest Rate Swap [Member] | Gain (Loss) on Derivative Instruments [Member] | Fair Value Hedging [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Recognized on derivatives | 0 | 0
Income/(expense) related to interest settlements on fair value hedging relationships | 0 | 0
Recognized on derivatives | 0 | 0
Interest Rate Swap [Member] | Gain (Loss) on Derivative Instruments [Member] | Not Designated as Hedging Instrument [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Total Interest Expense | (2,300) | (1,987)
Losses on financial derivatives | 2,168 | (2,088)
Future [Member] | Not Designated as Hedging Instrument [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Losses on financial derivatives | (228) | 225
Future [Member] | Interest Income [Member] | Not Designated as Hedging Instrument [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Losses on financial derivatives | 0 | 0
Future [Member] | Loans and Finance Receivables [Member] | Not Designated as Hedging Instrument [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Losses on financial derivatives | 0 | 0
Future [Member] | Interest Expense [Member] | Not Designated as Hedging Instrument [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Losses on financial derivatives | 0 | 0
Future [Member] | Gain (Loss) on Derivative Instruments [Member] | Not Designated as Hedging Instrument [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Losses on financial derivatives | $ (228) | $ 225

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