CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Condensed Consolidated Statements of Comprehensive Income [Abstract]
Unrealized holding (losses) gains arising during period, tax	$ 5,233,000	$ 535,000	$ 6,368,000	$ 890,000
Reclassification adjustment for losses included in net income, tax	$ 19,000	$ 4,000	$ 15,000	$ 2,000