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Securities Securities - Premium Amortization and Discount Accretion Included in Income on Securities (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015
Investments, Debt and Equity Securities [Abstract] |  |  |  |
Premium amortization | $ (22,762) | $ (21,354) | $ (67,321) | $ (62,192)
Discount accretion | 2,497 | 2,519 | 8,250 | 7,846
Net (premium amortization) discount accretion | $ (20,265) | $ (18,835) | $ (59,071) | $ (54,346)

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- Definition Amount of accretion of purchase discount on nonoperating securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.8) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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