Consolidated Statements of Income (Parenthetical) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Income Statement [Abstract]
Accumulated other comprehensive income reclassification for change in fair value of interest rate swap agreements	$ 102	$ 98	$ 304	$ 290
Accumulated other comprehensive income reclassifications for net realized gains on available-for-sale securities		103	328	1,400
Income tax expense from reclassification	$ (36)	$ 2	$ 8	$ 389