Loans and Allowance for Credit Losses Summary Of Gross Loans (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019	Jun. 30, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	$ 18,728,480	$ 16,864,336
Unearned income	(23,758)	(26,810)
Net Loans	18,704,722	16,837,526	$ 16,368,458
Real estate - commercial mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	6,934,936	6,700,776
Net Loans	6,934,936	6,700,776	6,497,973
Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	5,971,201	4,446,701
Net Loans	5,971,201	4,446,701	4,365,248
Real estate - residential mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	2,862,226	2,641,465
Net Loans	2,862,226	2,641,465	2,451,966
Real-estate - home equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	1,251,455	1,314,944
Net Loans	1,251,455	1,314,944	1,386,974
Real-estate - construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	972,909	971,079
Net Loans	972,909	971,079	922,547
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	465,610	463,164
Net Loans	465,610	463,164	$ 452,874
Equipment lease financing and other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	266,521	322,625
Overdrafts
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	$ 3,622	$ 3,582

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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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