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
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for Credit Loss, Beginning Balance	$ 134,710	$ 200,527	$ 150,044	$ 220,834
Provision for credit losses on loans	7,287	(27,433)	(3,399)	(37,788)
Loans charged off	6,740	8,868	14,202	21,809
Recoveries on Loans	2,782	8,169	5,596	11,158
Net loan charge-offs	3,958	699	8,606	10,651
Allowance for Credit Loss, Ending Balance	138,039	172,395	138,039	172,395
Liability for Unfunded Lending Commitments, Beginning Balance	25,032	42,430	24,204	38,307
Provision for credit losses on unfunded lending commitments	(125)	(18,222)	703	(14,099)
Liability for Unfunded Lending Commitments, Ending Balance	24,907	24,208	24,907	24,208
ALLOWANCE FOR CREDIT LOSSES ON LOANS AND LIABILITY FOR UNFUNDED LENDING COMMITMENTS	162,946	196,603	162,946	196,603
Commercial Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for Credit Loss, Beginning Balance	94,827	119,623	97,776	121,549
Provision for credit losses on loans	4,716	(26,579)	1,837	(28,488)
Loans charged off	207	270	384	502
Recoveries on Loans	189	5,264	296	5,479
Net loan charge-offs	18	(4,994)	88	(4,977)
Allowance for Credit Loss, Ending Balance	99,525	98,038	99,525	98,038
Liability for Unfunded Lending Commitments, Beginning Balance	23,780	41,513	23,271	37,259
Provision for credit losses on unfunded lending commitments	(163)	(18,163)	346	(13,909)
Liability for Unfunded Lending Commitments, Ending Balance	23,617	23,350	23,617	23,350
ALLOWANCE FOR CREDIT LOSSES ON LOANS AND LIABILITY FOR UNFUNDED LENDING COMMITMENTS	123,142	121,388	123,142	121,388
Personal Banking Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for Credit Loss, Beginning Balance	39,883	80,904	52,268	99,285
Provision for credit losses on loans	2,571	(854)	(5,236)	(9,300)
Loans charged off	6,533	8,598	13,818	21,307
Recoveries on Loans	2,593	2,905	5,300	5,679
Net loan charge-offs	3,940	5,693	8,518	15,628
Allowance for Credit Loss, Ending Balance	38,514	74,357	38,514	74,357
Liability for Unfunded Lending Commitments, Beginning Balance	1,252	917	933	1,048
Provision for credit losses on unfunded lending commitments	38	(59)	357	(190)
Liability for Unfunded Lending Commitments, Ending Balance	1,290	858	1,290	858
ALLOWANCE FOR CREDIT LOSSES ON LOANS AND LIABILITY FOR UNFUNDED LENDING COMMITMENTS	$ 39,804	$ 75,215	$ 39,804	$ 75,215