Consolidated Statements of Income and Comprehensive Income (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Statement [Abstract]
Accumulated other comprehensive income reclassification for change in fair value of interest rate swap agreements	$ 378	$ 384	$ 400
Accumulated other comprehensive income reclassifications for net realized gains on available-for-sale securities	666	429	355
Income tax expense from reclassification	$ 101	$ 16	$ (16)