Consolidated Statements of Income (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Income Statement [Abstract]
Accumulated other comprehensive income reclassification for change in fair value of interest rate swap agreements	$ 94	$ 94	$ 189	$ 191
Accumulated other comprehensive income reclassifications for net realized gains on available-for-sale securities	472	138	491	204
Income tax expense from reclassification	$ (132)	$ (15)	$ (106)	$ (5)