CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Other comprehensive income (loss):
Net unrealized gain (loss) on available-for-sale securities (net of taxes of $169, $1,476, and $2,940 for 2015, 2014, and 2013, respectively)	$ 169	$ 1,476	$ 2,940
Change in nonqualified pension plan unrecognized net gain (loss) and unrecognized prior service cost (net of taxes of $55, $133, and $38 for 2015, 2014, and 2013, respectively)	55	133	38
Net realized gain on sale of available-for-sale securities included in net income (net of taxes of $168, $51, and $418 for 2015, 2014 and 2013, respectively)	$ 168	$ 51	$ 418