Loans And Allowance For Credit Losses (Summary of Activity in the Allowance for Credit Losses) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for Credit Loss, Beginning Balance	$ 179,468	$ 162,742
Financing Receivable at acquisition on purchased credit deteriorated loans, Excluding Accrued Interest, after Allowance for Credit Loss	2,957
Financing Receivable at acquisition on purchased seasoned loans, Excluding Accrued Interest, after Allowance for Credit Loss	19,871
Provision for credit losses on loans	11,283	15,095
Loans charged off	17,217	13,293
Recoveries on Loans	2,243	2,487
Net loan charge-offs (recoveries)	14,974	10,806
Allowance for Credit Loss, Ending Balance	198,605	167,031
Liability for Unfunded Lending Commitments, Beginning Balance	17,660	18,935
Off-Balance-Sheet, Credit Loss at Acquisition, Liability	362
Provision for credit losses on unfunded lending commitments	(323)	(608)
Liability for Unfunded Lending Commitments, Ending Balance	17,699	18,327
ALLOWANCE FOR CREDIT LOSSES ON LOANS AND LIABILITY FOR UNFUNDED LENDING COMMITMENTS	216,304	185,358
Commercial Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for Credit Loss, Beginning Balance	116,865	106,769
Financing Receivable at acquisition on purchased credit deteriorated loans, Excluding Accrued Interest, after Allowance for Credit Loss	1,533
Financing Receivable at acquisition on purchased seasoned loans, Excluding Accrued Interest, after Allowance for Credit Loss	7,722
Provision for credit losses on loans	4,763	354
Loans charged off	5,799	726
Recoveries on Loans	153	303
Net loan charge-offs (recoveries)	5,646	423
Allowance for Credit Loss, Ending Balance	125,237	106,700
Liability for Unfunded Lending Commitments, Beginning Balance	16,539	17,887
Off-Balance-Sheet, Credit Loss at Acquisition, Liability	362
Provision for credit losses on unfunded lending commitments	(335)	(840)
Liability for Unfunded Lending Commitments, Ending Balance	16,566	17,047
ALLOWANCE FOR CREDIT LOSSES ON LOANS AND LIABILITY FOR UNFUNDED LENDING COMMITMENTS	141,803	123,747
Personal Banking Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for Credit Loss, Beginning Balance	62,603	55,973
Financing Receivable at acquisition on purchased credit deteriorated loans, Excluding Accrued Interest, after Allowance for Credit Loss	1,424
Financing Receivable at acquisition on purchased seasoned loans, Excluding Accrued Interest, after Allowance for Credit Loss	12,149
Provision for credit losses on loans	6,520	14,741
Loans charged off	11,418	12,567
Recoveries on Loans	2,090	2,184
Net loan charge-offs (recoveries)	9,328	10,383
Allowance for Credit Loss, Ending Balance	73,368	60,331
Liability for Unfunded Lending Commitments, Beginning Balance	1,121	1,048
Off-Balance-Sheet, Credit Loss at Acquisition, Liability	0
Provision for credit losses on unfunded lending commitments	12	232
Liability for Unfunded Lending Commitments, Ending Balance	1,133	1,280
ALLOWANCE FOR CREDIT LOSSES ON LOANS AND LIABILITY FOR UNFUNDED LENDING COMMITMENTS	$ 74,501	$ 61,611