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, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for Credit Loss, Beginning Balance	$ 158,685	$ 138,039	$ 150,136	$ 150,044
Provision for credit losses on loans	13,343	10,150	35,155	6,751
Loans charged off	11,926	7,230	29,812	21,432
Recoveries on Loans	2,142	2,418	6,765	8,014
Net loan charge-offs (recoveries)	9,784	4,812	23,047	13,418
Allowance for Credit Loss, Ending Balance	162,244	143,377	162,244	143,377
Liability for Unfunded Lending Commitments, Beginning Balance	29,235	24,907	33,120	24,204
Provision for credit losses on unfunded lending commitments	(1,698)	5,140	(5,583)	5,843
Liability for Unfunded Lending Commitments, Ending Balance	27,537	30,047	27,537	30,047
ALLOWANCE FOR CREDIT LOSSES ON LOANS AND LIABILITY FOR UNFUNDED LENDING COMMITMENTS	189,781	173,424	189,781	173,424
Commercial Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for Credit Loss, Beginning Balance	108,024	99,525	103,293	97,776
Provision for credit losses on loans	5,201	4,014	10,203	5,851
Loans charged off	2,664	509	3,263	893
Recoveries on Loans	66	56	394	352
Net loan charge-offs (recoveries)	2,598	453	2,869	541
Allowance for Credit Loss, Ending Balance	110,627	103,086	110,627	103,086
Liability for Unfunded Lending Commitments, Beginning Balance	27,842	23,617	31,743	23,271
Provision for credit losses on unfunded lending commitments	(1,724)	5,182	(5,625)	5,528
Liability for Unfunded Lending Commitments, Ending Balance	26,118	28,799	26,118	28,799
ALLOWANCE FOR CREDIT LOSSES ON LOANS AND LIABILITY FOR UNFUNDED LENDING COMMITMENTS	136,745	131,885	136,745	131,885
Personal Banking Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for Credit Loss, Beginning Balance	50,661	38,514	46,843	52,268
Provision for credit losses on loans	8,142	6,136	24,952	900
Loans charged off	9,262	6,721	26,549	20,539
Recoveries on Loans	2,076	2,362	6,371	7,662
Net loan charge-offs (recoveries)	7,186	4,359	20,178	12,877
Allowance for Credit Loss, Ending Balance	51,617	40,291	51,617	40,291
Liability for Unfunded Lending Commitments, Beginning Balance	1,393	1,290	1,377	933
Provision for credit losses on unfunded lending commitments	26	(42)	42	315
Liability for Unfunded Lending Commitments, Ending Balance	1,419	1,248	1,419	1,248
ALLOWANCE FOR CREDIT LOSSES ON LOANS AND LIABILITY FOR UNFUNDED LENDING COMMITMENTS	$ 53,036	$ 41,539	$ 53,036	$ 41,539