Loans and Allowance for Credit Losses Summary Of Gross Loans (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans before unearned income	$ 16,192,439	$ 15,795,918
Unearned income	(26,639)	(27,671)
Loans, net of unearned income	16,165,800	15,768,247
Loans and leases receivable, related parties	116,400	113,600
Proceeds from related party debt	54,600
Repayments of related party debt	51,800
Loans serviced by unrelated third party	4,800,000	4,600,000
Real estate – commercial mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans before unearned income	6,434,285	6,364,804
Loans, net of unearned income	6,434,285	6,364,804
Commercial – industrial, financial and agricultural
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans before unearned income	4,404,548	4,300,297
Loans, net of unearned income	4,404,548	4,300,297
Real estate – home equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans before unearned income	1,452,137	1,559,719
Loans, net of unearned income	1,452,137	1,559,719
Real estate – residential mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans before unearned income	2,251,044	1,954,711
Loans, net of unearned income	2,251,044	1,954,711
Real estate – construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans before unearned income	916,599	1,006,935
Loans, net of unearned income	916,599	1,006,935
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans before unearned income	419,186	313,783
Loans, net of unearned income	419,186	313,783
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans before unearned income	311,866	291,556
Overdrafts
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans before unearned income	$ 2,774	$ 4,113

Mortgage loans serviced by the Corporation for unrelated third parties

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Amount of deferred interest and fee income, unamortized costs incurred to originate loans and leases, unamortized loan commitments and loan syndication fees, and premiums over or discounts from face amounts of acquired loans. Excludes amounts for loans and leases covered under loss sharing agreements.

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