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Securities Securities - Premium Amortization and Discount Accretion Included in Income on Securities (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015
Investments, Debt and Equity Securities [Abstract] |  |  |  |
Premium amortization | $ (22,219) | $ (20,832) | $ (44,559) | $ (40,838)
Discount accretion | 3,138 | 2,629 | 5,753 | 5,327
Net (premium amortization) discount accretion | $ (19,081) | $ (18,203) | $ (38,806) | $ (35,511)

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