Loans and Allowance for Credit Losses Summary Of Gross Loans (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	$ 19,011,521	$ 18,923,921
Unearned income	(20,535)	(23,101)
Net Loans	18,990,986	18,900,820
Real estate - commercial mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	7,142,137	7,105,092
Net Loans	7,142,137	7,105,092
Commercial and industrial (1)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	5,675,714	5,670,828
Net Loans	5,675,714	5,670,828
Commercial and industrial (1) \| PPP Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	1,700,000	1,600,000
Real estate - residential mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	3,254,058	3,141,915
Net Loans	3,254,058	3,141,915
Real-estate - home equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	1,149,958	1,202,913
Net Loans	1,149,958	1,202,913
Real-estate - construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	1,083,494	1,047,218
Net Loans	1,083,494	1,047,218
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	451,857	466,772
Net Loans	451,857	466,772
Equipment lease financing and other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	252,930	284,377
Overdrafts
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	$ 1,373	$ 4,806

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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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