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Securities Securities - (Premium Amortization and Discount Accretion Included in Income on Securities) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Investments, Debt and Equity Securities [Abstract] |  |  |
Premium amortization | $ (97,841) | $ (90,782) | $ (84,467)
Discount accretion | 7,908 | 11,077 | 10,682
Net (premium amortization) discount accretion | $ (89,933) | $ (79,705) | $ (73,785)

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