Summary of Significant Accounting Policies Narrative (Details)		12 Months Ended
	Jan. 01, 2018 USD ($)	Dec. 31, 2018 USD ($) subsidiarytrusts	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Jan. 01, 2019 USD ($)
Property, Plant and Equipment [Line Items]
Number of banks owned | subsidiarytrusts		4
Days past due for nonaccrual status		90 days
Period for which change in loans are evaluated individually for impairment quarterly		12 months
Individual impairment, outstanding commitment threshold		$ 1,000,000.0
Financing Receivable, Obtaining Certified Thrid-party Appraisal For Impaired Loans, Period		12 months
Collective impairment review, outstanding commitment threshold (less than $1.0 million)		$ 1,000,000.0
Impaired loans with principal balances		89.00%	94.00%
Impaired loans balances, real estate as collateral		$ 1,000,000
Assets		20,682,152,000	$ 20,036,905,000
Foreign currency open position		$ 500,000
Award vesting period		3 years
Goodwill, impairment		$ 0	0	$ 0
Variable Interest Entity [Abstract]
Subsidiary trusts owned by parent | subsidiarytrusts		3
Amortization period of LIH investments		10 years
Reclassification of stranded tax effects		$ (7,101,000)
Decrease in retained earnings (less than)		(946,032,000)	(821,619,000)
Increase (Decrease) In Tax Credit Investments		$ 56,733,000	28,932,000	$ 40,663,000
Stock Options
Property, Plant and Equipment [Line Items]
Term of award		P10Y
Building and Building Improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life		50 years
Furniture and Fixtures
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life		8 years
Equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life		5 years
Consumer Loan
Property, Plant and Equipment [Line Items]
Number of days closed end consumer loans are charged off when they become past due		120 days
Number of days open end consumer loans are charged off when they become past due		180 days
Fulton Bank Subsidiary
Property, Plant and Equipment [Line Items]
Assets			$ 10,000,000,000
Accounting Standards Update 2018-02
Variable Interest Entity [Abstract]
Reclassification of stranded tax effects	$ 7,100,000
Forecast | Subsequent Event | Minimum | Accounting Standards Update 2016-02
Variable Interest Entity [Abstract]
Operating lease, right-of-use asset					$ 105,000,000
Operating lease, liability					105,000,000
Forecast | Subsequent Event | Maximum | Accounting Standards Update 2016-02
Variable Interest Entity [Abstract]
Operating lease, right-of-use asset					115,000,000
Operating lease, liability					$ 115,000,000