Loans and Allowance for Credit Losses Summary Of Gross Loans (Details) - USD ($)	12 Months Ended
Dec. 31, 2016	Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans before unearned income	$ 14,718,662,000	$ 13,854,118,000
Unearned income	(19,390,000)	(15,516,000)
Loans, net of unearned income	14,699,272,000	13,838,602,000
Loans and leases receivable, related parties	154,400,000	191,600,000
Proceeds from related party debt	26,600,000
Repayments of related party debt	63,800,000
Loans serviced by unrelated third party	4,700,000,000	4,800,000,000
Real estate – commercial mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans before unearned income	6,018,582,000	5,462,330,000
Loans, net of unearned income	6,018,582,000	5,462,330,000
Commercial – industrial, financial and agricultural
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans before unearned income	4,087,486,000	4,088,962,000
Loans, net of unearned income	4,087,486,000	4,088,962,000
Real estate – home equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans before unearned income	1,625,115,000	1,684,439,000
Loans, net of unearned income	1,625,115,000	1,684,439,000
Real estate – residential mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans before unearned income	1,601,994,000	1,376,160,000
Loans, net of unearned income	1,601,994,000	1,376,160,000
Real estate – construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans before unearned income	843,649,000	799,988,000
Loans, net of unearned income	843,649,000	799,988,000
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans before unearned income	291,470,000	268,588,000
Loans, net of unearned income	291,470,000	268,588,000
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans before unearned income	246,704,000	170,914,000
Overdrafts
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans before unearned income	$ 3,662,000	$ 2,737,000

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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-Name Accounting Standards Codification
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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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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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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