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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 | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Gain (Loss) on Investments [Line Items] |  |  |  |
Gross Realized Gains | $ 1,530 | $ 1,450 | $ 1,549 | $ 2,556
Gross Realized Losses | (1,526) | (14) | (1,526) | (14)
Net Gains (Losses) | 4 | 1,436 | 23 | 2,542
Equity Securities [Member] |  |  |  |
Gain (Loss) on Investments [Line Items] |  |  |  |
Gross Realized Gains | 0 | 1,305 | 9 | 2,350
Gross Realized Losses | 0 | 0 | 0 | 0
Net Gains (Losses) | 0 | 1,305 | 9 | 2,350
Debt Securities [Member] |  |  |  |
Gain (Loss) on Investments [Line Items] |  |  |  |
Gross Realized Gains | 1,530 | 145 | 1,540 | 206
Gross Realized Losses | (1,526) | (14) | (1,526) | (14)
Net Gains (Losses) | $ 4 | $ 131 | $ 14 | $ 192

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- Definition This item represents the difference between the gross realized gains and losses realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. Additionally, this item would include any losses recognized for other than temporary impairments (OTTI) of the subject investments in debt and equity 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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