SUBSEQUENT EVENTS - Additional Information (Detail) (Subsequent Event)	6 Months Ended
	Jun. 30, 2012	Jul. 17, 2012 Location
Subsequent Event [Line Items]
Number of branch branch banking locations to be acquired		15
Agreement entry Date to sell a branch in Rockland, Main	Jul. 01, 2012
Augusta And Bangor Markets
Subsequent Event [Line Items]
Number of branch branch banking locations to be acquired		3