Consolidated Statements of Income (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Income Statement [Abstract]
Accumulated other comprehensive income reclassification for change in fair value of interest rate swap agreements	$ 95	$ 96	$ 284	$ 287
Accumulated other comprehensive income reclassifications for net realized gains on available-for-sale securities	73	41	564	245
Income tax expense from reclassification	$ (7)	$ (20)	$ 98	$ (14)