Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Consolidated Statements of Comprehensive Income [Abstract]
Net income	$ 3,986	$ 4,074
Other comprehensive income (loss):
Change in net actuarial gain	35	28
Tax effect on change in net actuarial gain	(12)	(10)
Unrealized holding gains (losses) arising during the period	5,246	1,371
Tax effect on unrealized holding gains (losses) arising during the period	(1,836)	(480)
Reclassification adjustment for gains included in net income	(2,501)	(74)
Tax effect on reclassification adjustment for gains included in net income	875	26
Other comprehensive income (loss), net of tax	1,807	861
Comprehensive income	$ 5,793	$ 4,935