Loans And Allowance For Credit Losses (Summary of Activity in the Allowance for Credit Losses) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for Credit Loss, Beginning Balance	$ 138,039	$ 172,395	$ 150,044	$ 220,834
Provision for credit losses on loans	10,150	(5,961)	6,751	(43,749)
Loans charged off	7,230	6,577	21,432	28,386
Recoveries on Loans	2,418	2,918	8,014	14,076
Net loan charge-offs (recoveries)	4,812	3,659	13,418	14,310
Allowance for Credit Loss, Ending Balance	143,377	162,775	143,377	162,775
Liability for Unfunded Lending Commitments, Beginning Balance	24,907	24,208	24,204	38,307
Provision for credit losses on unfunded lending commitments	5,140	(1,424)	5,843	(15,523)
Liability for Unfunded Lending Commitments, Ending Balance	30,047	22,784	30,047	22,784
ALLOWANCE FOR CREDIT LOSSES ON LOANS AND LIABILITY FOR UNFUNDED LENDING COMMITMENTS	173,424	185,559	173,424	185,559
Commercial Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for Credit Loss, Beginning Balance	99,525	98,038	97,776	121,549
Provision for credit losses on loans	4,014	186	5,851	(28,302)
Loans charged off	509	190	893	692
Recoveries on Loans	56	130	352	5,609
Net loan charge-offs (recoveries)	453	60	541	(4,917)
Allowance for Credit Loss, Ending Balance	103,086	98,164	103,086	98,164
Liability for Unfunded Lending Commitments, Beginning Balance	23,617	23,350	23,271	37,259
Provision for credit losses on unfunded lending commitments	5,182	(1,564)	5,528	(15,473)
Liability for Unfunded Lending Commitments, Ending Balance	28,799	21,786	28,799	21,786
ALLOWANCE FOR CREDIT LOSSES ON LOANS AND LIABILITY FOR UNFUNDED LENDING COMMITMENTS	131,885	119,950	131,885	119,950
Personal Banking Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for Credit Loss, Beginning Balance	38,514	74,357	52,268	99,285
Provision for credit losses on loans	6,136	(6,147)	900	(15,447)
Loans charged off	6,721	6,387	20,539	27,694
Recoveries on Loans	2,362	2,788	7,662	8,467
Net loan charge-offs (recoveries)	4,359	3,599	12,877	19,227
Allowance for Credit Loss, Ending Balance	40,291	64,611	40,291	64,611
Liability for Unfunded Lending Commitments, Beginning Balance	1,290	858	933	1,048
Provision for credit losses on unfunded lending commitments	(42)	140	315	(50)
Liability for Unfunded Lending Commitments, Ending Balance	1,248	998	1,248	998
ALLOWANCE FOR CREDIT LOSSES ON LOANS AND LIABILITY FOR UNFUNDED LENDING COMMITMENTS	$ 41,539	$ 65,609	$ 41,539	$ 65,609