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Derivative Financial Instruments Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2017 | Dec. 31, 2016
Derivative [Line Items] |  |  |  |
Assets | $ 19,948,941 |  | $ 20,036,905 |
Foreign currency open position | 500 |  |  |
Mortgage Loans Held For Sale [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Gain (loss) in fair values of mortgage loans held for sale | $ (197) | $ 539 |  |
Fulton Bank Subsidiary [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Assets |  |  |  | $ 10,000,000

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