Loans And Allowance For Credit Losses (Summary of Activity in the Allowance for Credit Losses) (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Dec. 31, 2024
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for Credit Loss, Beginning Balance		$ 162,395	$ 162,395
Provision for credit losses on loans	$ 15,095	6,947
Loans charged off	13,293	11,165
Recoveries on Loans	2,487	2,288
Net loan charge-offs (recoveries)	10,806	8,877
Allowance for Credit Loss, Ending Balance		160,465
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest	167,031		162,742
Liability for Unfunded Lending Commitments, Beginning Balance	18,935	25,246	25,246
Provision for credit losses on unfunded lending commitments	(608)	(2,160)
Liability for Unfunded Lending Commitments, Ending Balance	18,327	23,086	18,935
ALLOWANCE FOR CREDIT LOSSES ON LOANS AND LIABILITY FOR UNFUNDED LENDING COMMITMENTS	185,358	183,551
Commercial Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for Credit Loss, Beginning Balance	106,769	108,201	108,201
Provision for credit losses on loans	354	(2,855)
Loans charged off	726	316	2,035
Recoveries on Loans	303	434
Net loan charge-offs (recoveries)	423	(118)
Allowance for Credit Loss, Ending Balance	106,700	105,464	106,769
Liability for Unfunded Lending Commitments, Beginning Balance	17,887	23,909	23,909
Provision for credit losses on unfunded lending commitments	(840)	(2,273)
Liability for Unfunded Lending Commitments, Ending Balance	17,047	21,636	17,887
ALLOWANCE FOR CREDIT LOSSES ON LOANS AND LIABILITY FOR UNFUNDED LENDING COMMITMENTS	123,747	127,100
Personal Banking Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for Credit Loss, Beginning Balance	55,973	54,194	54,194
Provision for credit losses on loans	14,741	9,802
Loans charged off	12,567	10,849	45,236
Recoveries on Loans	2,184	1,854
Net loan charge-offs (recoveries)	10,383	8,995
Allowance for Credit Loss, Ending Balance	60,331	55,001	55,973
Liability for Unfunded Lending Commitments, Beginning Balance	1,048	1,337	1,337
Provision for credit losses on unfunded lending commitments	232	113
Liability for Unfunded Lending Commitments, Ending Balance	1,280	1,450	$ 1,048
ALLOWANCE FOR CREDIT LOSSES ON LOANS AND LIABILITY FOR UNFUNDED LENDING COMMITMENTS	$ 61,611	$ 56,451