Loans and Allowance for Credit Losses Summary Of Gross Loans (Details) - USD ($)	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans before unearned income	$ 15,795,918,000	$ 14,718,662,000
Unearned income	(27,671,000)	(19,390,000)
Loans, net of unearned income	15,768,247,000	14,699,272,000
Loans and leases receivable, related parties	113,600,000	154,400,000
Proceeds from related party debt	4,916,000
Repayments of related party debt	45,800,000
Loans serviced by unrelated third party	4,600,000,000	4,700,000,000
Real estate – commercial mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans before unearned income	6,364,804,000	6,018,582,000
Loans, net of unearned income	6,364,804,000	6,018,582,000
Commercial – industrial, financial and agricultural
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans before unearned income	4,300,297,000	4,087,486,000
Loans, net of unearned income	4,300,297,000	4,087,486,000
Real estate – home equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans before unearned income	1,559,719,000	1,625,115,000
Loans, net of unearned income	1,559,719,000	1,625,115,000
Real estate – residential mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans before unearned income	1,954,711,000	1,601,994,000
Loans, net of unearned income	1,954,711,000	1,601,994,000
Real estate – construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans before unearned income	1,006,935,000	843,649,000
Loans, net of unearned income	1,006,935,000	843,649,000
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans before unearned income	313,783,000	291,470,000
Loans, net of unearned income	313,783,000	291,470,000
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans before unearned income	291,556,000	246,704,000
Overdrafts
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans before unearned income	$ 4,113,000	$ 3,662,000

Mortgage loans serviced by the Corporation for unrelated third parties

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Amount of deferred revenue as of balance sheet date. Deferred revenue represents collections of cash or other assets related to a revenue producing activity for which revenue has not yet been recognized. Generally, an entity records deferred revenue when it receives consideration from a customer before achieving certain criteria that must be met for revenue to be recognized in conformity with GAAP.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.

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Amount before allowance and after deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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For an unclassified balance sheet, reflects the carrying amount of unpaid loan amounts due from related parties at the balance sheet date.

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Amount of cash inflow from related parties which reduce the amount of loans and leases receivable due from related parties.

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