Loans And Allowance For Credit Losses (Summary of Activity in the Allowance for Credit Losses) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for Credit Loss, Beginning Balance	$ 150,136	$ 150,044
Provision for credit losses on loans	15,948	(10,686)
Loans charged off	9,048	7,462
Recoveries on Loans	2,281	2,814
Net loan charge-offs (recoveries)	6,767	4,648
Allowance for Credit Loss, Ending Balance	159,317	134,710
Liability for Unfunded Lending Commitments, Beginning Balance	33,120	24,204
Provision for credit losses on unfunded lending commitments	(4,492)	828
Liability for Unfunded Lending Commitments, Ending Balance	28,628	25,032
ALLOWANCE FOR CREDIT LOSSES ON LOANS AND LIABILITY FOR UNFUNDED LENDING COMMITMENTS	187,945	159,742
Commercial Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for Credit Loss, Beginning Balance	103,293	97,776
Provision for credit losses on loans	5,548	(2,879)
Loans charged off	292	177
Recoveries on Loans	66	107
Net loan charge-offs (recoveries)	226	70
Allowance for Credit Loss, Ending Balance	108,615	94,827
Liability for Unfunded Lending Commitments, Beginning Balance	31,743	23,271
Provision for credit losses on unfunded lending commitments	(4,638)	509
Liability for Unfunded Lending Commitments, Ending Balance	27,105	23,780
ALLOWANCE FOR CREDIT LOSSES ON LOANS AND LIABILITY FOR UNFUNDED LENDING COMMITMENTS	135,720	118,607
Personal Banking Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for Credit Loss, Beginning Balance	46,843	52,268
Provision for credit losses on loans	10,400	(7,807)
Loans charged off	8,756	7,285
Recoveries on Loans	2,215	2,707
Net loan charge-offs (recoveries)	6,541	4,578
Allowance for Credit Loss, Ending Balance	50,702	39,883
Liability for Unfunded Lending Commitments, Beginning Balance	1,377	933
Provision for credit losses on unfunded lending commitments	146	319
Liability for Unfunded Lending Commitments, Ending Balance	1,523	1,252
ALLOWANCE FOR CREDIT LOSSES ON LOANS AND LIABILITY FOR UNFUNDED LENDING COMMITMENTS	$ 52,225	$ 41,135