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Investment Securities Summary of Gains and Losses from Equity and Debt Securities, and Losses from Other-than-Temporary Impairment (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017
Gain (Loss) on Investments [Line Items] |  |
Gross Realized Gains | $ 19 | $ 1,106
Equity Securities [Member] |  |
Gain (Loss) on Investments [Line Items] |  |
Gross Realized Gains | 9 | 1,045
Debt Securities [Member] |  |
Gain (Loss) on Investments [Line Items] |  |
Gross Realized Gains | $ 10 | $ 61

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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=82897076&loc=d3e27357-111563 + Details
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