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Accounting Policies - Accounting Policies (Tables) | 6 Months Ended
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Jun. 30, 2018
Accounting Policies [Abstract] |
Schedule of Variable Interest Entities [Table Text Block] | The following tables present, by line of business, details about the consolidation of VIEs: Table 1.1
| Consolidation of Variable Interest Entities
| As of June 30, 2018
| Farm & Ranch |  | USDA Guarantees |  | Rural Utilities |  | Institutional Credit |  | Corporate |  | Total
| (in thousands)
On-Balance Sheet: |  |  |  |  |  |  |  |  |  |  |
Consolidated VIEs: |  |  |  |  |  |  |  |  |  |  |
Loans held for investment in consolidated trusts, at amortized cost | $ | 1,443,246 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 1,443,246 |
Debt securities of consolidated trusts held by third parties (1) | 1,449,888 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 1,449,888 |
Unconsolidated VIEs: |  |  |  |  |  |  |  |  |  |  |
Farmer Mac Guaranteed Securities: |  |  |  |  |  |  |  |  |  |  |
Carrying value (2) | — |  |  | 29,206 |  |  | — |  |  | — |  |  | — |  |  | 29,206 |
Maximum exposure to loss (3) | — |  |  | 28,938 |  |  | — |  |  | — |  |  | — |  |  | 28,938 |
Investment securities: |  |  |  |  |  |  |  |  |  |  |
Carrying value (4) | — |  |  | — |  |  | — |  |  | — |  |  | 917,479 |  |  | 917,479 |
Maximum exposure to loss (3) (4) | — |  |  | — |  |  | — |  |  | — |  |  | 917,260 |  |  | 917,260 |
Off-Balance Sheet: |  |  |  |  |  |  |  |  |  |  |
Unconsolidated VIEs: |  |  |  |  |  |  |  |  |  |  |
Farmer Mac Guaranteed Securities: |  |  |  |  |  |  |  |  |  |  |
Maximum exposure to loss (3) (5) | 297,833 |  |  | 325,652 |  |  | — |  |  | — |  |  | — |  |  | 623,485 |
(1) | Includes borrower remittances of $6.6 million. The borrower remittances had not been passed through to third party investors as of June 30, 2018.
(2) | Includes $0.3 million of unamortized premiums and discounts and fair value adjustments related to the USDA Guarantees line of business.
(3) | Farmer Mac uses unpaid principal balance and outstanding face amount of investment securities to represent maximum exposure to loss.
(4) | Includes auction-rate certificates, asset-backed securities, and government-sponsored enterprise ("GSE")-guaranteed mortgage-backed securities.
(5) | The amount under the Farm & Ranch line of business relates to unconsolidated trusts where Farmer Mac determined it was not the primary beneficiary due to shared power with an unrelated party.
| Consolidation of Variable Interest Entities
| As of December 31, 2017
| Farm & Ranch |  | USDA Guarantees |  | Rural Utilities |  | Institutional Credit |  | Corporate |  | Total
| (in thousands)
On-Balance Sheet: |  |  |  |  |  |  |  |  |  |  |
Consolidated VIEs: |  |  |  |  |  |  |  |  |  |  |
Loans held for investment in consolidated trusts, at amortized cost | $ | 1,399,827 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 1,399,827 |
Debt securities of consolidated trusts held by third parties (1) | 1,404,945 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 1,404,945 |
Unconsolidated VIEs: |  |  |  |  |  |  |  |  |  |  |
Farmer Mac Guaranteed Securities: |  |  |  |  |  |  |  |  |  |  |
Carrying value (2) | — |  |  | 30,300 |  |  | — |  |  | — |  |  | — |  |  | 30,300 |
Maximum exposure to loss (3) | — |  |  | 29,980 |  |  | — |  |  | — |  |  | — |  |  | 29,980 |
Investment securities: |  |  |  |  |  |  |  |  |  |  |
Carrying value (4) | — |  |  | — |  |  | — |  |  | — |  |  | 783,964 |  |  | 783,964 |
Maximum exposure to loss (3) (4) | — |  |  | — |  |  | — |  |  | — |  |  | 783,916 |  |  | 783,916 |
Off-Balance Sheet: |  |  |  |  |  |  |  |  |  |  |
Unconsolidated VIEs: |  |  |  |  |  |  |  |  |  |  |
Farmer Mac Guaranteed Securities: |  |  |  |  |  |  |  |  |  |  |
Maximum exposure to loss (3) (5) | 333,511 |  |  | 254,217 |  |  | — |  |  | — |  |  | — |  |  | 587,728 |
(1) | Includes borrower remittances of $5.1 million, which have not been passed through to third party investors as of December 31, 2017.
(2) | Includes $0.3 million of unamortized premiums and discounts and fair value adjustments related to the USDA Guarantees line of business.
(3) | Farmer Mac uses unpaid principal balance and the outstanding face amount of investment securities to represent maximum exposure to loss.
(4) | Includes auction-rate certificates, asset-backed securities, and GSE-guaranteed mortgage-backed securities.
(5) | The amount under the Farm & Ranch line of business relates to unconsolidated trusts where Farmer Mac determined it was not the primary beneficiary due to shared power with an unrelated party.
Schedule of Cash Flow, Supplemental Disclosures | The following table sets forth information regarding certain cash and non-cash transactions for the six months ended June 30, 2018 and 2017: Table 1.2
| For the Six Months Ended
| June 30, 2018 |  | June 30, 2017
| (in thousands)
Non-cash activity: |  |  |
Real estate owned acquired through loan liquidation | — |  |  | 5,261 |
Loans acquired and securitized as Farmer Mac Guaranteed Securities | 196,290 |  |  | 247,975 |
Consolidation of Farm & Ranch Guaranteed Securities from off-balance sheet to loans held for investment in consolidated trusts and to debt securities of consolidated trusts held by third parties | 116,983 |  |  | 161,880 |
Purchases of securities - traded not yet settled | 48,600 |  |  | 50,000 |
Earnings Per Common Share | The following schedule reconciles basic and diluted EPS for the three and six months ended June 30, 2018 and 2017: Table 1.3
| For the Three Months Ended
| June 30, 2018 |  | June 30, 2017
| Net Income |  | Weighted-Average Shares |  | $ per Share |  | Net Income |  | Weighted-Average Shares |  | $ per Share
| (in thousands, except per share amounts)
Basic EPS |  |  |  |  |  |  |  |  |  |  |
Net income attributable to common stockholders | $ | 26,340 |  |  | 10,658 |  |  | $ | 2.47 |  |  | $ | 17,488 |  |  | 10,600 |  |  | $ | 1.65 |
Effect of dilutive securities(1) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock options, SARs and restricted stock | — |  |  | 84 |  |  | (0.02 | ) |  | — |  |  | 183 |  |  | (0.03 | )
Diluted EPS | $ | 26,340 |  |  | 10,742 |  |  | $ | 2.45 |  |  | $ | 17,488 |  |  | 10,783 |  |  | $ | 1.62 |
(1) | For the three months ended June 30, 2018, no SARs were outstanding but not included in the computation of diluted earnings per share of common stock because they were anti-dilutive, compared to 24,907 stock options and SARs for the three months ended June 30, 2017. For the three months ended June 30, 2018 and 2017, contingent shares of non-vested restricted stock of 13,138 and 32,892, respectively, were outstanding but not included in the computation of diluted earnings per share of common stock because performance conditions had not yet been met.
| For the Six Months Ended
| June 30, 2018 |  | June 30, 2017
| Net Income |  | Weighted-Average Shares |  | $ per Share |  | Net Income |  | Weighted-Average Shares |  | $ per Share
| (in thousands, except per share amounts)
Basic EPS |  |  |  |  |  |  |  |  |  |  |
Net income attributable to common stockholders | $ | 48,864 |  |  | 10,640 |  |  | $ | 4.59 |  |  | $ | 36,103 |  |  | 10,576 |  |  | $ | 3.41 |
Effect of dilutive securities(1) |  |  |  |  |  |  |  |  |  |  |  |  |
Stock options, SARs and restricted stock | — |  |  | 102 |  |  | (0.04 | ) |  | — |  |  | 207 |  |  | (0.06 | )
Diluted EPS | $ | 48,864 |  |  | 10,742 |  |  | $ | 4.55 |  |  | $ | 36,103 |  |  | 10,783 |  |  | $ | 3.35 |
(1) | For the six months ended June 30, 2018, 25,062 SARs were outstanding but not included in the computation of diluted earnings per share of common stock because they were anti-dilutive, compared to 37,832 stock options and SARs for the six months ended June 30, 2017. For the six months ended June 30, 2018 and 2017, contingent shares of non-vested restricted stock of 13,138 and 32,892, respectively, were outstanding but not included in the computation of diluted earnings per share of common stock because performance conditions had not yet been met.
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] | Table 1.4
| As of June 30, 2018 |  | As of June 30, 2017
| Available-for-Sale Securities |  | Held-to-Maturity Securities |  | Cash Flow Hedges |  | Total |  | Available-for-Sale Securities |  | Held-to-Maturity Securities |  | Cash Flow Hedges |  | Total
| (in thousands)
For the Three Months Ended: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning Balance | $ | 15,094 |  |  | $ | 47,201 |  |  | $ | 9,816 |  |  | $ | 72,111 |  |  | $ | (4,742 | ) |  | $ | 43,485 |  |  | $ | 2,801 |  |  | $ | 41,544 |
Other comprehensive income/(loss) before reclassifications | 2,209 |  |  | — |  |  | 1,778 |  |  | 3,987 |  |  | 6,191 |  |  | — |  |  | (1,500 | ) |  | 4,691 |
Amounts reclassified from AOCI | (1,421 | ) |  | (1,222 | ) |  | (45 | ) |  | (2,688 | ) |  | (2,725 | ) |  | (1,381 | ) |  | 299 |  |  | (3,807 | )
Net comprehensive income/(loss) | 788 |  |  | (1,222 | ) |  | 1,733 |  |  | 1,299 |  |  | 3,466 |  |  | (1,381 | ) |  | (1,201 | ) |  | 884 |
Ending Balance | $ | 15,882 |  |  | $ | 45,979 |  |  | $ | 11,549 |  |  | $ | 73,410 |  |  | $ | (1,276 | ) |  | $ | 42,104 |  |  | $ | 1,600 |  |  | $ | 42,428 |
For the Six Months Ended: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning Balance | $ | (1,676 | ) |  | $ | 48,236 |  |  | $ | 4,525 |  |  | $ | 51,085 |  |  | $ | (14,387 | ) |  | $ | 45,752 |  |  | $ | 2,393 |  |  | $ | 33,758 |
Cumulative effect from change in hedge accounting | — |  |  | — |  |  | 27 |  |  | 27 |  |  | — |  |  | — |  |  | — |  |  | — |
Adjusted Beginning Balance | (1,676 | ) |  | 48,236 |  |  | 4,552 |  |  | 51,112 |  |  | (14,387 | ) |  | 45,752 |  |  | 2,393 |  |  | 33,758 |
Other comprehensive income/(loss) before reclassifications | 20,396 |  |  | — |  |  | 6,831 |  |  | 27,227 |  |  | 18,413 |  |  | — |  |  | (1,426 | ) |  | 16,987 |
Amounts reclassified from AOCI | (2,838 | ) |  | (2,257 | ) |  | 166 |  |  | (4,929 | ) |  | (5,302 | ) |  | (3,648 | ) |  | 633 |  |  | (8,317 | )
Net comprehensive income/(loss) | 17,558 |  |  | (2,257 | ) |  | 6,997 |  |  | 22,298 |  |  | 13,111 |  |  | (3,648 | ) |  | (793 | ) |  | 8,670 |
Ending Balance | $ | 15,882 |  |  | $ | 45,979 |  |  | $ | 11,549 |  |  | $ | 73,410 |  |  | $ | (1,276 | ) |  | $ | 42,104 |  |  | $ | 1,600 |  |  | $ | 42,428 |
Reclassification out of Accumulated Other Comprehensive Income [Table Text Block] | The following table presents other comprehensive income activity, the impact on net income of amounts reclassified from each component of AOCI, and the related tax impact for the three and six months ended June 30, 2018 and 2017: Table 1.5
| For the Three Months Ended
| June 30, 2018 |  | June 30, 2017
| Before Tax |  | Provision (Benefit) |  | After Tax |  | Before Tax |  | Provision (Benefit) |  | After Tax
| (in thousands)
Other comprehensive income: |  |  |  |  |  |  |  |  |  |  |
Available-for-sale-securities: |  |  |  |  |  |  |  |  |  |  |
Unrealized holding gains on available-for-sale-securities | $ | 2,795 |  |  | $ | 586 |  |  | $ | 2,209 |  |  | $ | 9,525 |  |  | $ | 3,334 |  |  | $ | 6,191 |
Less reclassification adjustments included in: |  |  |  |  |  |  |  |  |  |  |
Net Interest Income(1) | (1,791 | ) |  | (376 | ) |  | (1,415 | ) |  | — |  |  | — |  |  | — |
Gains/(losses) on financial derivatives and hedging activities(1) | — |  |  | — |  |  | — |  |  | (4,186 | ) |  | (1,465 | ) |  | (2,721 | )
Other income(2) | (8 | ) |  | (2 | ) |  | (6 | ) |  | (6 | ) |  | (2 | ) |  | (4 | )
Total | $ | 996 |  |  | $ | 208 |  |  | $ | 788 |  |  | $ | 5,333 |  |  | $ | 1,867 |  |  | $ | 3,466 |
Held-to-maturity securities: |  |  |  |  |  |  |  |  |  |  |
Less reclassification adjustments included in: |  |  |  |  |  |  |  |  |  |  |
Net interest income(3) | (1,546 | ) |  | (324 | ) |  | (1,222 | ) |  | (2,125 | ) |  | (744 | ) |  | (1,381 | )
Total | $ | (1,546 | ) |  | $ | (324 | ) |  | $ | (1,222 | ) |  | $ | (2,125 | ) |  | $ | (744 | ) |  | $ | (1,381 | )
Cash flow hedges |  |  |  |  |  |  |  |  |  |  |
Unrealized gains/(losses) on cash flow hedges | $ | 2,251 |  |  | $ | 473 |  |  | $ | 1,778 |  |  | $ | (2,309 | ) |  | $ | (809 | ) |  | $ | (1,500 | )
Less reclassification adjustments included in: |  |  |  |  |  |  |  |  |  |  |
Net interest income(4) | (57 | ) |  | (12 | ) |  | (45 | ) |  | 461 |  |  | 162 |  |  | 299 |
Total | $ | 2,194 |  |  | $ | 461 |  |  | $ | 1,733 |  |  | $ | (1,848 | ) |  | $ | (647 | ) |  | $ | (1,201 | )
Other comprehensive income | $ | 1,644 |  |  | $ | 345 |  |  | $ | 1,299 |  |  | $ | 1,360 |  |  | $ | 476 |  |  | $ | 884 |
(1) | Relates to the amortization of unrealized gains on hedged items prior to the application of fair value hedge accounting.
(2) | Represents amortization of deferred gains related to certain available-for-sale USDA Securities and Farmer Mac Guaranteed USDA Securities.
(3) | Relates to the amortization of unrealized gains or losses prior to the reclassification of these securities from available-for-sale to held-to-maturity. The amortization of unrealized gains or losses reported in AOCI for held-to-maturity securities will be offset by the amortization of the premium or discount created from the transfer into held-to-maturity securities, which occurred at fair value. These unrealized gains or losses will be recorded over the remaining life of the security with no impact on future net income.
(4) | Relates to the recognition of unrealized gains and losses on cash flow hedges recorded in AOCI.
| For the Six Months Ended
| June 30, 2018 |  | June 30, 2017
| Before Tax |  | Provision (Benefit) |  | After Tax |  | Before Tax |  | Provision (Benefit) |  | After Tax
| (in thousands)
Other comprehensive income: |  |  |  |  |  |  |  |  |  |  |
Available-for-sale-securities: |  |  |  |  |  |  |  |  |  |  |
Unrealized holding gains on available-for-sale-securities | $ | 25,817 |  |  | $ | 5,421 |  |  | $ | 20,396 |  |  | $ | 28,328 |  |  | $ | 9,915 |  |  | $ | 18,413 |
Less reclassification adjustments included in: |  |  |  |  |  |  |  |  |  |  |
Net Interest Income(1) | (3,578 | ) |  | (752 | ) |  | (2,826 | ) |  | — |  |  | — |  |  | — |
Gains/(losses) on financial derivatives and hedging activities(1) | — |  |  | — |  |  | — |  |  | (8,145 | ) |  | (2,851 | ) |  | (5,294 | )
Other income(2) | (15 | ) |  | (3 | ) |  | (12 | ) |  | (13 | ) |  | (5 | ) |  | (8 | )
Total | $ | 22,224 |  |  | $ | 4,666 |  |  | $ | 17,558 |  |  | $ | 20,170 |  |  | $ | 7,059 |  |  | $ | 13,111 |
Held-to-maturity securities: |  |  |  |  |  |  |  |  |  |  |
Less reclassification adjustments included in: |  |  |  |  |  |  |  |  |  |  |
Net interest income(3) | (2,856 | ) |  | (599 | ) |  | (2,257 | ) |  | (5,612 | ) |  | (1,964 | ) |  | (3,648 | )
Total | $ | (2,856 | ) |  | $ | (599 | ) |  | $ | (2,257 | ) |  | $ | (5,612 | ) |  | $ | (1,964 | ) |  | $ | (3,648 | )
Cash flow hedges |  |  |  |  |  |  |  |  |  |  |
Unrealized gains/(losses) on cash flow hedges | $ | 8,647 |  |  | $ | 1,816 |  |  | $ | 6,831 |  |  | $ | (2,192 | ) |  | $ | (766 | ) |  | $ | (1,426 | )
Less reclassification adjustments included in: |  |  |  |  |  |  |  |  |  |  |
Net interest income(4) | 210 |  |  | 44 |  |  | 166 |  |  | 973 |  |  | 340 |  |  | 633 |
Total | $ | 8,857 |  |  | $ | 1,860 |  |  | $ | 6,997 |  |  | $ | (1,219 | ) |  | $ | (426 | ) |  | $ | (793 | )
Other comprehensive income | $ | 28,225 |  |  | $ | 5,927 |  |  | $ | 22,298 |  |  | $ | 13,339 |  |  | $ | 4,669 |  |  | $ | 8,670 |
(1) | Relates to the amortization of unrealized gains on hedged items prior to the application of fair value hedge accounting.
(2) | Represents amortization of deferred gains related to certain available-for-sale USDA Securities and Farmer Mac Guaranteed USDA Securities.
(3) | Relates to the amortization of unrealized gains or losses prior to the reclassification of these securities from available-for-sale to held-to-maturity. The amortization of unrealized gains or losses reported in AOCI for held-to-maturity securities will be offset by the amortization of the premium or discount created from the transfer into held-to-maturity securities, which occurred at fair value. These unrealized gains or losses will be recorded over the remaining life of the security with no impact on future net income.
(4) | Relates to the recognition of unrealized gains and losses on cash flow hedges recorded in AOCI.

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- Definition Tabular disclosure of the significant judgments and assumptions made in determining whether a variable interest (as defined) held by the entity requires the variable interest entity (VIE) (as defined) to be consolidated and (or) disclose information about its involvement with the VIE, individually or in aggregate (as applicable); the nature of restrictions, if any, on the consolidated VIE's assets and on the settlement of its liabilities reported by an entity in its statement of financial position, including the carrying amounts of such assets and liabilities; the nature of, and changes in, the risks associated with involvement in the VIE; how involvement with the VIE affects the entity's financial position, financial performance, and cash flows; the lack of recourse if creditors (or beneficial interest holders) of the consolidated VIE have no recourse to the general credit of the primary beneficiary (if applicable); the terms of arrangements, giving consideration to both explicit arrangements and implicit variable interests, if any, that could require the entity to provide financial support to the VIE, including events or circumstances that could expose the entity to a loss; the methodology used by the entity for determining whether or not it is the primary beneficiary of the variable interest entity; the significant factors considered and judgments made in determining that the power to direct the activities of a VIE that most significantly impact the VIE's economic performance are shared (as defined); the carrying amounts and classification of assets and liabilities of the VIE included in the statement of financial position; the entity's maximum exposure to loss, if any, as a result of its involvement with the VIE, including how the maximum exposure is determined and significant sources of the entity's exposure to the VIE; a comparison of the carrying amounts of the assets and liabilities and the entity's maximum exposure to loss; information about any liquidity arrangements, guarantees, and (or) other commitments by third parties that may affect the fair value or risk of the entity's variable interest in the VIE; whether or not the entity has provided financial support or other support (explicitly or implicitly) to the VIE that it was not previously contractually required to provide or whether the entity intends to provide that support, including the type and amount of the support and the primary reasons for providing the support; and supplemental information the entity determines necessary to provide. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=77990344&loc=d3e5747-111685 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=77990344&loc=SL6228884-111685 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=77990344&loc=d3e5728-111685 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 5A -URI http://asc.fasb.org/extlink&oid=77990344&loc=SL6759159-111685 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=77990344&loc=d3e5710-111685 + Details
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