CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Statement of Comprehensive Income [Abstract]
Net income	$ 12,972	$ 12,482	$ 11,474
Other comprehensive income (loss):
Net unrealized gain (loss) on available-for-sale securities (net of tax expense (benefit) of $285, $(1,242), and $(169) for 2017, 2016, and 2015, respectively)	585	(2,390)	(329)
Reclassification adjustment for net realized gain on sale of available-for-sale securities included in net income (net of tax expense of $81, $370, and $168 for 2017, 2016 and 2015, respectively)	(152)	(712)	(327)
Change in nonqualified pension plan unrecognized net gain (loss) and unrecognized prior service cost (net of tax expense (benefit) of $(53), $128, and $55 for 2017, 2016, and 2015, respectively)	(158)	249	107
Other comprehensive income (loss)	275	(2,853)	(549)
TOTAL COMPREHENSIVE INCOME	13,247	9,629	10,925
COMPONENTS OF ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX, AS OF YEAR-END:
Net unrealized gain (loss) on securities available-for-sale	(2,200)	(2,633)	469
Net unfunded liability for nonqualified pension plan	(142)	16	(233)
Balance at year-end	$ (2,342)	$ (2,617)	$ 236