Loans (Average Recorded Investment And Interest Income Recognized On Impaired Loans) (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
Loans [Line Items]
Average Recorded Investment	$ 346,699	[1]	$ 463,822	[1]	$ 357,076	[1]	$ 467,121	[1]
Interest Income Recognized	2,496	[1]	1,437	[1]	4,011	[1]	2,515	[1]
Commercial Loan [Member]
Loans [Line Items]
Average Recorded Investment	137,872	[1]	101,875	[1]	127,625	[1]	93,836	[1]
Interest Income Recognized	2,069	[1]	574	[1]	2,824	[1]	669	[1]
Commercial Real Estate [Member]
Loans [Line Items]
Average Recorded Investment	162,404	[1]	253,823	[1]	176,949	[1]	269,082	[1]
Interest Income Recognized	389	[1]	682	[1]	987	[1]	1,497	[1]
Construction Loans [Member]
Loans [Line Items]
Average Recorded Investment	2,175	[1]	46,046	[1]	3,461	[1]	40,027	[1]
Interest Income Recognized			46	[1]			74	[1]
Residential Real Estate [Member]
Loans [Line Items]
Average Recorded Investment	13,667	[1]	17,799	[1]	15,644	[1]	18,061	[1]
Interest Income Recognized	14	[1]	9	[1]	34	[1]	19	[1]
Home Equity Line of Credit [Member]
Loans [Line Items]
Average Recorded Investment	12,762	[1]	12,414	[1]	12,301	[1]	11,352	[1]
Interest Income Recognized	24	[1]	2	[1]	47	[1]	3	[1]
Consumer Loan [Member]
Loans [Line Items]
Average Recorded Investment	17,819	[1]	31,865	[1]	21,096	[1]	34,763	[1]
Interest Income Recognized			$ 124	[1]	$ 119	[1]	$ 253	[1]

[1] Represents amounts while classified as impaired for the periods presented.