Mergers And Acquisitions (Details) (USD $) In Thousands, except Share data, unless otherwise specified				3 Months Ended
	Mar. 31, 2012	Dec. 31, 2010	Dec. 31, 2010 Comm Bancorp, Inc. [Member]	Mar. 31, 2012 Parkvale [Member]
Business Acquisition [Line Items]
Assets acquired as a result of merger	$ 1,845,965		$ 625,570	$ 1,815,663
Loans acquired as a result of merger	922,056		445,271	937,350
Deposits acquired as a result of merger	1,525,253		561,775	1,505,671
Value of acquisition	136,818		75,547	136,818
Cash paid for acquisition of CBI			17,203
Common stock issued for exchange in merger	12,159,312	5,941,287	1,719,978	5,582,846
Value of preferred stock repaid				31,762
Warrants converted to purchase of common stock	819,640			819,640
Warrant, expiration date				Dec. 23, 2018
Warrants, exercise price				$ 5.81
Goodwill recorded as a result of merger			40,256	101,543
Core deposit intangible recorded as a result of merger			4,785	14,984
Merger and integration charges				$ 6,994