5. INVESTMENT SECURITIES (Detail) (USD $)	3 Months Ended		12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Investments, Debt and Equity Securities [Abstract]
Available-for-sale Securities, Change in Net Unrealized Holding Gain (Loss), Net of Tax	$ 4,026,000		$ 4,285,000
Other Comprehensive Income (Loss), Available-for-sale Securities, Tax	2,684,000		2,857,000
Proceeds From Sales And Calls Of Available For Sale Securities		4,908,000
Available-for-sale Securities, Gross Realized Gains		$ 64,000
Continuous Loss Position, Additional Information	the Company held 206 securities of which 16 were in a loss position for less than twelve months and none were in a loss position for twelve months or more. Of the 16 securities in a loss position, all are mortgage-backed securities. At December 31, 2012, the Company held 196 securities of which 16 were in a loss position for less than twelve months and none were in a loss position for twelve months or more. All 16 securities in a loss position were mortgage-backed securities