Allowance For Loan Losses And Credit Quality (Schedule Of Investment In Impaired Loan) (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2012		Jun. 30, 2011		Jun. 30, 2012		Jun. 30, 2011		Dec. 31, 2011
Commercial Loans [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	$ 33,053				$ 33,053				$ 40,140
Unpaid Principal Balance	34,561				34,561				42,193
Related Allowance	(1,508)				(1,508)				(2,053)
Average Recorded Investment	37,209		63,269		39,717		55,714
Interest Income Recognized	25	[1]	148	[1]	76	[1]	577	[1]
Commercial Loans [Member] | With No Related Allowance Recorded [Member] | Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	28,530				28,530				32,267
Unpaid Principal Balance	28,530				28,530				32,267
Average Recorded Investment	30,999		34,152		31,888		32,104
Interest Income Recognized	20	[1]	62	[1]	58	[1]	134	[1]
Commercial Loans [Member] | With No Related Allowance Recorded [Member] | Business [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	2,607				2,607				6,403
Unpaid Principal Balance	2,607				2,607				6,403
Average Recorded Investment	2,693		11,875		3,951		6,294
Interest Income Recognized			58	[1]	2	[1]	251	[1]
Commercial Loans [Member] | With An Allowance Recorded [Member] | Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	1,876				1,876				1,430
Unpaid Principal Balance	3,183				3,183				3,304
Related Allowance	(1,307)				(1,307)				(1,874)
Average Recorded Investment	3,275		17,195		3,634		17,269
Interest Income Recognized	5	[1]	28	[1]	15	[1]	192	[1]
Commercial Loans [Member] | With An Allowance Recorded [Member] | Business [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	40				40				40
Unpaid Principal Balance	241				241				219
Related Allowance	(201)				(201)				(179)
Average Recorded Investment	242		47		244		47
Interest Income Recognized					1	[1]
Mortgage Loans [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	7,334				7,334				4,763
Unpaid Principal Balance	7,539				7,539				4,910
Related Allowance	(205)				(205)				(147)
Average Recorded Investment	6,458		6,159		6,535		6,219
Interest Income Recognized			3	[1]	16	[1]	23	[1]
Mortgage Loans [Member] | With An Allowance Recorded [Member] | Mortgage - Prime [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	7,334				7,334				4,763
Unpaid Principal Balance	7,539				7,539				4,910
Related Allowance	(205)				(205)				(147)
Average Recorded Investment	6,458		6,159		6,535		6,219
Interest Income Recognized			3	[1]	16	[1]	23	[1]
Consumer And Other Loans [Member] | With An Allowance Recorded [Member] | Indirect Automobile [Member]
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	1,026		1,062		1,134		1,162
Interest Income Recognized			3	[1]	3	[1]	10	[1]
Consumer And Other Loans [Member] | With An Allowance Recorded [Member] | Credit Card [Member]
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	374		436		399		393
Consumer And Other Loans [Member] | With An Allowance Recorded [Member] | Home Equity [Member]
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	7,094		6,248		7,315		6,120
Interest Income Recognized			10	[1]	11	[1]	40	[1]
Consumer And Other Loans [Member] | With An Allowance Recorded [Member] | Consumer - Other [Member]
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	661		1,771		731		1,684
Interest Income Recognized			3	[1]	2	[1]	11	[1]
Consumer Loans [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	8,177				8,177				6,812
Unpaid Principal Balance	8,257				8,257				6,889
Related Allowance	(80)				(80)				(77)
Average Recorded Investment	9,155		9,517		9,579		9,359
Interest Income Recognized			18	[1]	16	[1]	61	[1]
Consumer Loans [Member] | With An Allowance Recorded [Member] | Indirect Automobile [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	862				862				987
Unpaid Principal Balance	867				867				994
Related Allowance	(5)				(5)				(7)
Consumer Loans [Member] | With An Allowance Recorded [Member] | Credit Card [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	361				361				391
Unpaid Principal Balance	372				372				403
Related Allowance	(11)				(11)				(12)
Consumer Loans [Member] | With An Allowance Recorded [Member] | Home Equity [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	6,406				6,406				4,826
Unpaid Principal Balance	6,462				6,462				4,873
Related Allowance	(56)				(56)				(47)
Consumer Loans [Member] | With An Allowance Recorded [Member] | Consumer - Other [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	548				548				608
Unpaid Principal Balance	556				556				619
Related Allowance	$ (8)				$ (8)				$ (11)

[1] Interest income recognized on impaired loans represents income recognized before loans were placed on nonaccrual status.