CONSOLIDATED STATEMENTS OF INCOME (unaudited) (Parenthetical) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Income Statement [Abstract]
Net gains reclassified from accumulated other comprehensive income	$ 238	$ 107	$ 527	$ 497
Income tax expense from reclassification items	$ 84	$ 40	$ 204	$ 190