BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Textuals) (Details) (USD $)	12 Months Ended				12 Months Ended
	Dec. 31, 2012 plan subsidiary	Dec. 31, 2011	Dec. 31, 2012 F&M Bank [Member]	Dec. 31, 2007 F&M Bank [Member]	Dec. 31, 2012 Core Deposit Intangibles [Member]	Dec. 31, 2012 Subsidiary, Banner Bank [Member] office	Dec. 31, 2012 Subsidiary, Islanders Bank [Member] location
Basis of Presentation and Summary of Significant Accounting Policies [Abstract]
Number of wholly-owned subsidiaries	2
Number of offices						85
Number of production offices						7
Number of locations							3
Federal home loan bank stock	$ 36,705,000	$ 37,371,000
Federal home loan bank stock, par value per share	$ 100.00
Proceeds from sale of FHLB stock	665,900
Intangible asset, useful life					8 years
Cash surrender value of insurance policies	59,900,000	58,600,000
Notional amount of interest rate swaps	$ 95,000,000		$ 16,000,000	$ 23,000,000
ESOP, employee loan, percentage of employer's initial public offering	8.00%
Number of stock option plans	3