Loans And Allowance For Credit Losses (Summary of Activity in the Allowance for Credit Losses) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for Credit Loss, Beginning Balance	$ 160,465	$ 159,317	$ 162,395	$ 150,136	$ 150,136
Provision for credit losses on loans	7,849	5,864	14,796	21,812
Loans charged off	11,868	8,838	23,033	17,886
Recoveries on Loans	2,111	2,342	4,399	4,623
Net loan charge-offs (recoveries)	9,757	6,496	18,634	13,263
Allowance for Credit Loss, Ending Balance	158,557	158,685	158,557	158,685	162,395
Liability for Unfunded Lending Commitments, Beginning Balance	23,086	28,628	25,246	33,120	33,120
Provision for credit losses on unfunded lending commitments	(2,381)	607	(4,541)	(3,885)
Liability for Unfunded Lending Commitments, Ending Balance	20,705	29,235	20,705	29,235	25,246
ALLOWANCE FOR CREDIT LOSSES ON LOANS AND LIABILITY FOR UNFUNDED LENDING COMMITMENTS	179,262	187,920	179,262	187,920
Commercial Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for Credit Loss, Beginning Balance	105,464	108,615	108,201	103,293	103,293
Provision for credit losses on loans	2,367	(546)	(488)	5,002
Loans charged off	850	307	1,166	599	3,885
Recoveries on Loans	236	262	670	328
Net loan charge-offs (recoveries)	614	45	496	271
Allowance for Credit Loss, Ending Balance	107,217	108,024	107,217	108,024	108,201
Liability for Unfunded Lending Commitments, Beginning Balance	21,636	27,105	23,909	31,743	31,743
Provision for credit losses on unfunded lending commitments	(2,273)	737	(4,546)	(3,901)
Liability for Unfunded Lending Commitments, Ending Balance	19,363	27,842	19,363	27,842	23,909
ALLOWANCE FOR CREDIT LOSSES ON LOANS AND LIABILITY FOR UNFUNDED LENDING COMMITMENTS	126,580	135,866	126,580	135,866
Personal Banking Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for Credit Loss, Beginning Balance	55,001	50,702	54,194	46,843	46,843
Provision for credit losses on loans	5,482	6,410	15,284	16,810
Loans charged off	11,018	8,531	21,867	17,287	36,283
Recoveries on Loans	1,875	2,080	3,729	4,295
Net loan charge-offs (recoveries)	9,143	6,451	18,138	12,992
Allowance for Credit Loss, Ending Balance	51,340	50,661	51,340	50,661	54,194
Liability for Unfunded Lending Commitments, Beginning Balance	1,450	1,523	1,337	1,377	1,377
Provision for credit losses on unfunded lending commitments	(108)	(130)	5	16
Liability for Unfunded Lending Commitments, Ending Balance	1,342	1,393	1,342	1,393	$ 1,337
ALLOWANCE FOR CREDIT LOSSES ON LOANS AND LIABILITY FOR UNFUNDED LENDING COMMITMENTS	$ 52,682	$ 52,054	$ 52,682	$ 52,054