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Summary of Significant Accounting Policies Narrative (Details) | 12 Months Ended
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Dec. 31, 2017 USD ($) subsidiarytrusts | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Property, Plant and Equipment [Line Items] |  |  |
Number of banks owned | subsidiarytrusts | 6 |  |
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 | 94.00% | 62.00% |
Impaired loans balances, real estate as collateral | $ 1,000,000 |  |
Threshold of companies current loan to value ratio of original appraisals used | 70.00% |  |
Assets | $ 20,036,905,000 | $ 18,944,247,000 |
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 |  |
Income taxes | $ 62,701,000 | 46,624,000 | 49,921,000
FDIC insurance expense | 11,049,000 | 9,767,000 | 11,470,000
Share-based compensation, excess tax benefit, amount | $ 1,300,000 |  |
Stock Options |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Term of award | P10Y |  |
New Market Tax Credit (NMTC) and Historic Rehabilitation (Tax Credit Investments) |  |  |
Variable Interest Entity [Abstract] |  |  |
Income taxes | $ (2,200,000) | (3,100,000) | (2,600,000)
LIH Low Income Housing |  |  |
Variable Interest Entity [Abstract] |  |  |
Income taxes | 13,400,000 | 11,200,000 | 9,800,000
Income Tax Credits and Adjustments | (41,400,000) | (31,800,000) | $ (26,000,000)
Other Assets |  |  |
Variable Interest Entity [Abstract] |  |  |
Investments in low income housing | 205,800,000 | 186,400,000 |
Other Noncurrent Liabilities |  |  |
Variable Interest Entity [Abstract] |  |  |
Investments, in low income housing, additional commitments | $ 68,800,000 |  |
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 |

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