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Financial Derivatives - Schedule of Net Income/(Expense) Recognized (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Interest Income Farmer Mac Guaranteed Securities and USDA Securities | $ 81,649 | $ 76,870 | $ 252,629 | $ 213,479
Interest Income Loans | 56,992 | 50,622 | 167,792 | 145,671
Total Interest Expense | (121,384) | (97,557) | (358,374) | (265,611)
Gains/(losses) on financial derivatives | (7,360) | 628 | 1,193 | (688)
Total | 9,897 | 30,563 | 63,240 | 92,851
Fair Value Hedging [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Recognized on hedged items | 116,623 | (15,090) | 316,799 | (39,602)
(Losses)/gains on fair value hedging relationships | (4,490) | 1,051 | (8,617) | 5,751
Cash Flow Hedging [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Discount amortization recognized on hedged items | (1) | (2) | (3) | (5)
Interest settlements reclassified from AOCI into net income on derivatives | 317 | 189 | 1,260 | (21)
Recognized on hedged items | (2,726) | (2,501) | (8,142) | (6,611)
Expense recognized on cash flow hedges | (2,410) | (2,314) | (6,885) | (6,637)
Designated as Hedging Instrument [Member] | Fair Value Hedging [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Recognized on hedged items | 27,978 | 8,608 | 72,233 | 22,275
Discount amortization recognized on hedged items | (146) | (177) | (460) | (534)
Not Designated as Hedging Instrument [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Gains/(losses) on financial derivatives | (7,360) | 628 | 1,193 | (688)
Interest Income [Member] | Fair Value Hedging [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Recognized on hedged items | 84,164 | (13,432) | 258,155 | (43,229)
(Losses)/gains on fair value hedging relationships | (3,331) | (12) | (4,731) | 3,125
Interest Income [Member] | Cash Flow Hedging [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Discount amortization recognized on hedged items | 0 | 0 | 0 | 0
Interest settlements reclassified from AOCI into net income on derivatives | 0 | 0 | 0 | 0
Recognized on hedged items | 0 | 0 | 0 | 0
Expense recognized on cash flow hedges | 0 | 0 | 0 | 0
Interest Income [Member] | Designated as Hedging Instrument [Member] | Fair Value Hedging [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Recognized on hedged items | 31,435 | 16,769 | 86,628 | 46,289
Discount amortization recognized on hedged items | 0 | 0 | 0 | 0
Interest Income [Member] | Not Designated as Hedging Instrument [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Gains/(losses) on financial derivatives | 0 | 0 | 0 | 0
Loans and Finance Receivables [Member] | Fair Value Hedging [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Recognized on hedged items | 33,493 | (4,062) | 83,524 | (13,106)
(Losses)/gains on fair value hedging relationships | (2,104) | (153) | (6,107) | (542)
Loans and Finance Receivables [Member] | Cash Flow Hedging [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Discount amortization recognized on hedged items | 0 | 0 | 0 | 0
Interest settlements reclassified from AOCI into net income on derivatives | 0 | 0 | 0 | 0
Recognized on hedged items | 0 | 0 | 0 | 0
Expense recognized on cash flow hedges | 0 | 0 | 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 | 7,321 | 1,660 | 18,199 | 4,619
Discount amortization recognized on hedged items | 0 | 0 | 0 | 0
Loans and Finance Receivables [Member] | Not Designated as Hedging Instrument [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Gains/(losses) on financial derivatives | 0 | 0 | 0 | 0
Interest Expense [Member] | Fair Value Hedging [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Recognized on hedged items | (1,034) | 2,404 | (24,880) | 16,733
(Losses)/gains on fair value hedging relationships | 945 | 1,216 | 2,221 | 3,168
Interest Expense [Member] | Cash Flow Hedging [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Discount amortization recognized on hedged items | (1) | (2) | (3) | (5)
Interest settlements reclassified from AOCI into net income on derivatives | 317 | 189 | 1,260 | (21)
Recognized on hedged items | (2,726) | (2,501) | (8,142) | (6,611)
Expense recognized on cash flow hedges | (2,410) | (2,314) | (6,885) | (6,637)
Interest Expense [Member] | Designated as Hedging Instrument [Member] | Fair Value Hedging [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Recognized on hedged items | (10,778) | (9,821) | (32,594) | (28,633)
Discount amortization recognized on hedged items | (146) | (177) | (460) | (534)
Interest Expense [Member] | Not Designated as Hedging Instrument [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Gains/(losses) on financial derivatives | 0 | 0 | 0 | 0
Gain (Loss) on Derivative Instruments [Member] | Fair Value Hedging [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Recognized on hedged items | 0 | 0 | 0 | 0
(Losses)/gains on fair value hedging relationships | 0 | 0 | 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 | 0 | 0
Interest settlements reclassified from AOCI into net income on derivatives | 0 | 0 | 0 | 0
Recognized on hedged items | 0 | 0 | 0 | 0
Expense recognized on cash flow hedges | 0 | 0 | 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 | 0 | 0
Discount amortization recognized on hedged items | 0 | 0 | 0 | 0
Gain (Loss) on Derivative Instruments [Member] | Not Designated as Hedging Instrument [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Gains/(losses) on financial derivatives | (7,360) | 628 | 1,193 | (688)
Interest Rate Swap [Member] | Fair Value Hedging [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Recognized on derivatives | (2,596) | (1,528) | (5,894) | (5,410)
Income/(expense) related to interest settlements on fair value hedging relationships | 25,236 | 6,903 | 65,879 | 16,331
Recognized on derivatives | (121,113) | 16,141 | (325,416) | 45,353
Interest Rate Swap [Member] | Not Designated as Hedging Instrument [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Total Interest Expense | 127 | (3,048) | (3,321) | (8,903)
Gains/(losses) on financial derivatives | (7,402) | 3,267 | 5,920 | 7,443
Interest Rate Swap [Member] | Interest Income [Member] | Fair Value Hedging [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Recognized on derivatives | (1,051) | 1,272 | 1,665 | 465
Income/(expense) related to interest settlements on fair value hedging relationships | 30,384 | 18,041 | 88,293 | 46,754
Recognized on derivatives | (87,495) | 13,420 | (262,886) | 46,354
Interest Rate Swap [Member] | Interest Income [Member] | Not Designated as Hedging Instrument [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Total Interest Expense | 0 | 0 | 0 | 0
Gains/(losses) on financial derivatives | 0 | 0 | 0 | 0
Interest Rate Swap [Member] | Loans and Finance Receivables [Member] | Fair Value Hedging [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Recognized on derivatives | (584) | (98) | (808) | (560)
Income/(expense) related to interest settlements on fair value hedging relationships | 6,737 | 1,562 | 17,391 | 4,059
Recognized on derivatives | (35,597) | 3,909 | (89,631) | 12,564
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 | 0 | 0
Gains/(losses) on financial derivatives | 0 | 0 | 0 | 0
Interest Rate Swap [Member] | Interest Expense [Member] | Fair Value Hedging [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Recognized on derivatives | (961) | (2,702) | (6,751) | (5,315)
Income/(expense) related to interest settlements on fair value hedging relationships | (11,885) | (12,700) | (39,805) | (34,482)
Recognized on derivatives | 1,979 | (1,188) | 27,101 | (13,565)
Interest Rate Swap [Member] | Interest Expense [Member] | Not Designated as Hedging Instrument [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Total Interest Expense | 0 | 0 | 0 | 0
Gains/(losses) on financial derivatives | 0 | 0 | 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 | 0 | 0
Income/(expense) related to interest settlements on fair value hedging relationships | 0 | 0 | 0 | 0
Recognized on derivatives | 0 | 0 | 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 | 127 | (3,048) | (3,321) | (8,903)
Gains/(losses) on financial derivatives | (7,402) | 3,267 | 5,920 | 7,443
Future [Member] | Not Designated as Hedging Instrument [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Gains/(losses) on financial derivatives | (85) | 409 | (1,406) | 772
Future [Member] | Interest Income [Member] | Not Designated as Hedging Instrument [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Gains/(losses) on financial derivatives | 0 | 0 | 0 | 0
Future [Member] | Loans and Finance Receivables [Member] | Not Designated as Hedging Instrument [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Gains/(losses) on financial derivatives | 0 | 0 | 0 | 0
Future [Member] | Interest Expense [Member] | Not Designated as Hedging Instrument [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Gains/(losses) on financial derivatives | 0 | 0 | 0 | 0
Future [Member] | Gain (Loss) on Derivative Instruments [Member] | Not Designated as Hedging Instrument [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Gains/(losses) on financial derivatives | $ (85) | $ 409 | $ (1,406) | $ 772

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