ACQUISITIONS AND FDIC INDEMNIFICATION ASSET: (Details Textual) (USD $)	12 Months Ended				12 Months Ended	54 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Aug. 16, 2013 Bank of America branch drive-up_facility	Dec. 31, 2013 First National Bank Of Danville	Dec. 31, 2013 First National Bank Of Danville
Business Acquisition [Line Items]
Number of bank branches acquired				7
Number of drive-up facilities acquired				2
Cash and equivalents				$ 177,700,000
Loans				1,900,000
Property, plant, and equipment				5,900,000
Customer related core deposit intangible assets				2,200,000
Deposits				189,300,000
Other liabilities				300,000
Goodwill	39,489,000	37,612,000		1,900,000
Goodwill recorded, which is expected to be tax deductable				1,900
Losses on assets, threshold under loss-sharing agreement (up to $29 million)					29,000,000
Percentage of losses to be reimbursed by the FDIC, on losses up to the threshold amount (percent)					80.00%
Percentage of losses to be reimbursed by the FDIC, on losses exceeding the threshold amount (percent)					95.00%
Reimbursements from the FDIC	(352,000)	(2,174,000)				(18,400,000)
Outstanding balance for reimbursement of losses	1,055,000	2,632,000	2,384,000
Net changes in losses and expenses added	(1,225,000)	2,422,000			470,000
Percentage of loans, acquired and subject to the loss-sharing agreement with the FDIC, which were included in the estimate of future potential losses (percent)					80.00%
Covered loans	$ 18,500,000	$ 23,500,000