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Accounting Policies - Changes in Accumulated Other Comprehensive Income, Net of Tax (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, before Tax |  | $ 8,433 | $ (9,270) | $ 59,887
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
AOCI Beginning Balance |  | (11,019) | 15,533 | (16,202)
Other comprehensive income/(loss) before reclassifications |  | 55,062 | (7,181) | 53,065
Amounts reclassified from AOCI |  | (10,285) | (19,371) | (21,330)
Net other comprehensive income/(loss) |  | 44,777 | (26,552) | 31,735
AOCI Ending Balance |  | 33,758 | (11,019) | 15,533
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Tax |  | 2,952 | (3,244) | 20,960
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Net of Tax |  | 5,481 | (6,026) | 38,927
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax |  | 2,000 | 1,200 | 200
Other Comprehensive Income (Loss), before Tax |  | 68,889 | (40,850) | 48,823
Other Comprehensive Income (Loss), Tax |  | 24,112 | (14,298) | 17,088
Accumulated Net Investment Gain (Loss) Including Portion Attributable to Noncontrolling Interest [Member] | Available-for-sale Securities [Member] |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
AOCI Beginning Balance |  | (10,035) | 9,716 | (16,272)
Other comprehensive income/(loss) before reclassifications |  | 5,481 | (6,026) | 38,927
Amounts reclassified from AOCI |  | (9,833) | (13,725) | (12,939)
Net other comprehensive income/(loss) |  | (4,352) | (19,751) | 25,988
AOCI Ending Balance |  | (14,387) | (10,035) | 9,716
Other Comprehensive Income (Loss), before Tax |  | (6,694) | (30,387) | 39,980
Other Comprehensive Income (Loss), Tax |  | (2,342) | (10,636) | 13,992
Accumulated Net Investment Gain (Loss) Including Portion Attributable to Noncontrolling Interest [Member] | Held-to-maturity Securities [Member] |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
AOCI Beginning Balance |  | (476) | 5,973 | 0
Other comprehensive income/(loss) before reclassifications | [1] | 47,993 | 0 | 14,502
Amounts reclassified from AOCI |  | (1,765) | (6,449) | (8,529)
Net other comprehensive income/(loss) |  | 46,228 | (6,449) | 5,973
AOCI Ending Balance |  | 45,752 | (476) | 5,973
Other Comprehensive Income (Loss), before Tax |  | 71,120 | (9,922) | 9,190
Other Comprehensive Income (Loss), Tax |  | 24,892 | (3,473) | 3,217
Other Comprehensive Income (Loss), before Reclassifications, before Tax | [1] | 73,835 | 0 | 22,311
Other Comprehensive Income (Loss) before Reclassifications, Tax | [1] | 25,842 | 0 | 7,809
Accumulated Net Gain (Loss) from Cash Flow Hedges Including Portion Attributable to Noncontrolling Interest [Member] |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
AOCI Beginning Balance |  | (508) | (156) | 70
Other comprehensive income/(loss) before reclassifications |  | 1,588 | (1,155) | (364)
Amounts reclassified from AOCI |  | 1,313 | 803 | 138
Net other comprehensive income/(loss) |  | 2,901 | (352) | (226)
AOCI Ending Balance |  | 2,393 | (508) | (156)
Other Comprehensive Income (Loss), before Tax |  | 4,463 | (541) | (347)
Other Comprehensive Income (Loss), Tax |  | 1,562 | (189) | (121)
Other Comprehensive Income (Loss), before Reclassifications, before Tax |  | 2,443 | (1,776) | (559)
Other Comprehensive Income (Loss) before Reclassifications, Tax |  | 855 | (621) | (195)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Gain (Loss) on Derivative Instruments [Member] | Accumulated Net Investment Gain (Loss) Including Portion Attributable to Noncontrolling Interest [Member] | Available-for-sale Securities [Member] |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Amounts reclassified from AOCI | [2] | (9,994) | (13,081) | (12,488)
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax |  | (15,375) | (20,125) | (19,213)
Reclassification from AOCI, Current Period, Tax |  | (5,381) | (7,044) | (6,725)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Other Income [Member] | Accumulated Net Investment Gain (Loss) Including Portion Attributable to Noncontrolling Interest [Member] | Available-for-sale Securities [Member] |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Amounts reclassified from AOCI | [3] | 155 | (638) | (606)
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax |  | 239 | (982) | (933)
Reclassification from AOCI, Current Period, Tax |  | 84 | (344) | (327)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Interest Income [Member] | Accumulated Net Investment Gain (Loss) Including Portion Attributable to Noncontrolling Interest [Member] | Held-to-maturity Securities [Member] |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Amounts reclassified from AOCI | [4] | (1,765) | (6,449) | (8,529)
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax |  | (2,715) | (9,922) | (13,121)
Reclassification from AOCI, Current Period, Tax |  | (950) | (3,473) | (4,592)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Interest Expense [Member] | Accumulated Net Gain (Loss) from Cash Flow Hedges Including Portion Attributable to Noncontrolling Interest [Member] |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Amounts reclassified from AOCI | [5] | 1,313 | 803 | 138
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax | [5] | 2,020 | 1,235 | 212
Reclassification from AOCI, Current Period, Tax | [5] | $ 707 | $ 432 | $ 74
[1] | Represents the accumulated unrealized gain on the USDA Securities and the Farmer Mac Guaranteed Securities transferred from available-for-sale to held-to-maturity.
[2] | (1) Relates to the amortization of unrealized gains on hedged items prior to the application of fair value hedge accounting.
[3] | Represents amortization of deferred gains related to certain available-for-sale USDA Securities and Farmer Mac Guaranteed USDA Securities.
[4] | 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.
[5] | Relates to the recognition of unrealized gains and losses on cash flow hedges recorded in AOCI.

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- Definition Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=66004124&loc=d3e637-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=66004124&loc=d3e681-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=66004124&loc=SL7669686-108580 + Details
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