Principles Of Consolidation And Presentation (Narrative) (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Jan. 01, 2020	Dec. 31, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Financing Receivable, Allowance for Credit Loss	$ 171,653	$ 139,643
Off-Balance Sheet, Credit Loss, Liability	32,250	17,165	$ 1,075
Commercial Portfolio Segment [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Financing Receivable, Allowance for Credit Loss	83,551	62,049
Off-Balance Sheet, Credit Loss, Liability	31,061	16,456
Personal Banking Portfolio Segment [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Financing Receivable, Allowance for Credit Loss	88,102	77,594
Off-Balance Sheet, Credit Loss, Liability	$ 1,189	709
Retained Earnings [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative Effect of New Accounting Principle in Period of Adoption		3,800
Accounting Standards Update 2016-13
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative Effect of New Accounting Principle in Period of Adoption			3,766
Financing Receivable, Allowance for Credit Loss		(21,039)
Off-Balance Sheet, Credit Loss, Liability		16,090
Deferred Income Tax Assets, Net		(1,200)
Accounting Standards Update 2016-13 | Commercial Portfolio Segment [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Financing Receivable, Allowance for Credit Loss		(29,711)
Accounting Standards Update 2016-13 | Personal Banking Portfolio Segment [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Financing Receivable, Allowance for Credit Loss		$ 8,672
Accounting Standards Update 2016-13 | Retained Earnings [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative Effect of New Accounting Principle in Period of Adoption			$ 3,766