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Accounting Policies - Changes in Accumulated Other Comprehensive Income, Net of Tax (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2017 | Mar. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, before Tax |  | $ 18,804 | $ (2,722)
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |
AOCI Beginning Balance |  | 33,758 | (11,019)
Other comprehensive income/(loss) before reclassifications |  | 12,299 | (5,164)
Amounts reclassified from AOCI |  | (4,513) | (2,734)
Net other comprehensive income/(loss) |  | 7,786 | (7,898)
AOCI Ending Balance |  | 41,544 | (18,917)
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Tax |  | 6,581 | (953)
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Net of Tax |  | 12,223 | (1,769)
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax |  | 500 |
Other Comprehensive Income (Loss), before Tax |  | 11,980 | (12,151)
Other Comprehensive Income (Loss), Tax |  | 4,194 | (4,253)
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 |  | (14,387) | (10,035)
Other comprehensive income/(loss) before reclassifications |  | 12,223 | (1,769)
Amounts reclassified from AOCI |  | (2,578) | (2,376)
Net other comprehensive income/(loss) |  | 9,645 | (4,145)
AOCI Ending Balance |  | (4,742) | (14,180)
Other Comprehensive Income (Loss), before Tax |  | 14,838 | (6,377)
Other Comprehensive Income (Loss), Tax |  | 5,193 | (2,232)
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 |  | 45,752 | (476)
Other comprehensive income/(loss) before reclassifications |  | 0 | 0
Amounts reclassified from AOCI |  | (2,267) | (657)
Net other comprehensive income/(loss) |  | (2,267) | (657)
AOCI Ending Balance |  | 43,485 | (1,133)
Other Comprehensive Income (Loss), before Tax |  | (3,487) | (1,011)
Other Comprehensive Income (Loss), Tax |  | (1,220) | (354)
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 |  | 2,393 | (508)
Other comprehensive income/(loss) before reclassifications |  | 76 | (3,395)
Amounts reclassified from AOCI |  | 332 | 299
Net other comprehensive income/(loss) |  | 408 | (3,096)
AOCI Ending Balance |  | 2,801 | (3,604)
Other Comprehensive Income (Loss), before Tax |  | 629 | (4,763)
Other Comprehensive Income (Loss), Tax |  | 221 | (1,667)
Other Comprehensive Income (Loss), before Reclassifications, before Tax |  | 117 | (5,222)
Other Comprehensive Income (Loss) before Reclassifications, Tax |  | 41 | (1,827)
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 | [1] | (2,573) | (2,550)
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax |  | (3,959) | (3,923)
Reclassification from AOCI, Current Period, Tax |  | (1,386) | (1,373)
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 | [2] | (5) | 168
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax |  | (7) | 259
Reclassification from AOCI, Current Period, Tax |  | (2) | 91
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 | [3] | (2,267) | (657)
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax |  | (3,487) | (1,011)
Reclassification from AOCI, Current Period, Tax |  | (1,220) | (354)
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 |  | 332 | 299
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax |  | 512 | 459
Reclassification from AOCI, Current Period, Tax |  | $ 180 | $ 160
[1] | (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 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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