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Derivative Financial Instruments Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017 | Dec. 31, 2016
Derivative [Line Items] |  |  |  |  |  |
Assets | $ 20,172,539 |  | $ 20,172,539 |  | $ 20,036,905 |
Foreign currency open position | 500 |  | 500 |  |  |
Mortgage Loans Held For Sale [Member] |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Gain (loss) in fair values of mortgage loans held for sale | $ 324 | $ 26 | $ 127 | $ 565 |  |
Fulton Bank Subsidiary [Member] |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Assets |  |  |  |  |  | $ 10,000,000

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