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, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for Credit Loss, Beginning Balance	$ 165,260	$ 158,557	$ 162,742	$ 162,395
Provision for credit losses on loans	20,739	11,861	43,753	26,657
Loans charged off	12,628	11,757	37,946	34,790
Recoveries on Loans	2,300	2,178	7,122	6,577
Net loan charge-offs (recoveries)	10,328	9,579	30,824	28,213
Allowance for Credit Loss, Ending Balance	175,671	160,839	175,671	160,839
Liability for Unfunded Lending Commitments, Beginning Balance	16,005	20,705	18,935	25,246
Provision for credit losses on unfunded lending commitments	(678)	(2,721)	(3,608)	(7,262)
Liability for Unfunded Lending Commitments, Ending Balance	15,327	17,984	15,327	17,984
ALLOWANCE FOR CREDIT LOSSES ON LOANS AND LIABILITY FOR UNFUNDED LENDING COMMITMENTS	190,998	178,823	190,998	178,823
Commercial Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for Credit Loss, Beginning Balance	106,854	107,217	106,769	108,201
Provision for credit losses on loans	6,873	(63)	7,412	(551)
Loans charged off	889	362	2,110	1,528
Recoveries on Loans	86	255	853	925
Net loan charge-offs (recoveries)	803	107	1,257	603
Allowance for Credit Loss, Ending Balance	112,924	107,047	112,924	107,047
Liability for Unfunded Lending Commitments, Beginning Balance	14,771	19,363	17,887	23,909
Provision for credit losses on unfunded lending commitments	(756)	(2,715)	(3,872)	(7,261)
Liability for Unfunded Lending Commitments, Ending Balance	14,015	16,648	14,015	16,648
ALLOWANCE FOR CREDIT LOSSES ON LOANS AND LIABILITY FOR UNFUNDED LENDING COMMITMENTS	126,939	123,695	126,939	123,695
Personal Banking Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for Credit Loss, Beginning Balance	58,406	51,340	55,973	54,194
Provision for credit losses on loans	13,866	11,924	36,341	27,208
Loans charged off	11,739	11,395	35,836	33,262
Recoveries on Loans	2,214	1,923	6,269	5,652
Net loan charge-offs (recoveries)	9,525	9,472	29,567	27,610
Allowance for Credit Loss, Ending Balance	62,747	53,792	62,747	53,792
Liability for Unfunded Lending Commitments, Beginning Balance	1,234	1,342	1,048	1,337
Provision for credit losses on unfunded lending commitments	78	(6)	264	(1)
Liability for Unfunded Lending Commitments, Ending Balance	1,312	1,336	1,312	1,336
ALLOWANCE FOR CREDIT LOSSES ON LOANS AND LIABILITY FOR UNFUNDED LENDING COMMITMENTS	$ 64,059	$ 55,128	$ 64,059	$ 55,128