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Derivative Financial Instruments Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Derivative [Line Items]          
Assets $ 20,062,860   $ 20,062,860   $ 18,944,247
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 $ (120) $ (360) $ 445 $ 504  
Fulton Bank Subsidiary [Member]          
Derivative [Line Items]          
Assets         $ 10,000,000