Loans And Allowance For Credit Losses (Summary of Activity in the Allowance for Credit Losses) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for Credit Loss, Beginning Balance	$ 150,044	$ 220,834
Provision for credit losses on loans	(10,686)	(10,355)
Loans charged off	7,462	12,941
Recoveries on Loans	2,814	2,989
Net loan charge-offs	4,648	9,952
Allowance for Credit Loss, Ending Balance	134,710	200,527
Liability for Unfunded Lending Commitments, Beginning Balance	24,204	38,307
Provision for credit losses on unfunded lending commitments	828	4,123
Liability for Unfunded Lending Commitments, Ending Balance	25,032	42,430
ALLOWANCE FOR CREDIT LOSSES ON LOANS AND LIABILITY FOR UNFUNDED LENDING COMMITMENTS	159,742	242,957
Commercial Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for Credit Loss, Beginning Balance	97,776	121,549
Provision for credit losses on loans	(2,879)	(1,909)
Loans charged off	177	232
Recoveries on Loans	107	215
Net loan charge-offs	70	17
Allowance for Credit Loss, Ending Balance	94,827	119,623
Liability for Unfunded Lending Commitments, Beginning Balance	23,271	37,259
Provision for credit losses on unfunded lending commitments	509	4,254
Liability for Unfunded Lending Commitments, Ending Balance	23,780	41,513
ALLOWANCE FOR CREDIT LOSSES ON LOANS AND LIABILITY FOR UNFUNDED LENDING COMMITMENTS	118,607	161,136
Personal Banking Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for Credit Loss, Beginning Balance	52,268	99,285
Provision for credit losses on loans	(7,807)	(8,446)
Loans charged off	7,285	12,709
Recoveries on Loans	2,707	2,774
Net loan charge-offs	4,578	9,935
Allowance for Credit Loss, Ending Balance	39,883	80,904
Liability for Unfunded Lending Commitments, Beginning Balance	933	1,048
Provision for credit losses on unfunded lending commitments	319	(131)
Liability for Unfunded Lending Commitments, Ending Balance	1,252	917
ALLOWANCE FOR CREDIT LOSSES ON LOANS AND LIABILITY FOR UNFUNDED LENDING COMMITMENTS	$ 41,135	$ 81,821