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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 | 9 Months Ended
--- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015
Gain (Loss) on Investments [Line Items] |  |  |  |
Gross Realized Gains | $ 2 | $ 1,730 | $ 1,061 | $ 8,290
Gross Realized Losses | 0 | 0 | (36) | 0
Net Gains (Losses) | 2 | 1,730 | 1,025 | 8,290
Equity Securities [Member] |  |  |  |
Gain (Loss) on Investments [Line Items] |  |  |  |
Gross Realized Gains | 2 | 1,730 | 739 | 5,990
Gross Realized Losses | 0 | 0 | (10) | 0
Net Gains (Losses) | 2 | 1,730 | 729 | 5,990
Debt Securities [Member] |  |  |  |
Gain (Loss) on Investments [Line Items] |  |  |  |
Gross Realized Gains | 0 | 0 | 322 | 2,300
Gross Realized Losses | 0 | 0 | (26) | 0
Net Gains (Losses) | $ 0 | $ 0 | $ 296 | $ 2,300

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