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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, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Investments, Debt and Equity Securities [Abstract] |  |  |  |
Premium amortization | $ (30,988) | $ (29,408) | $ (63,333) | $ (59,287)
Discount accretion | 571 | 1,378 | 1,156 | 2,561
Net (premium amortization) discount accretion | $ (30,417) | $ (28,030) | $ (62,177) | $ (56,726)

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