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Changes in Accumulated Other Comprehensive Income by Component - Additional Information (Details) (Details) - USD ($) $ in Thousands | 9 Months Ended
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Sep. 30, 2016 | Sep. 30, 2015
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] |  |
Realized gains from the sale of available for sale securities | $ 226 | $ 5

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- Definition This item represents the gross profit realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27357-111563 + Details
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