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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, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Investments, Debt and Equity Securities [Abstract] |  |  |  |
Premium amortization | $ (29,511) | $ (27,381) | $ (88,798) | $ (80,104)
Discount accretion | 1,274 | 2,569 | 3,835 | 6,356
Net (premium amortization) discount accretion | $ (28,237) | $ (24,812) | $ (84,963) | $ (73,748)

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