Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Net income	$ 9,066	$ 6,418	$ 17,934	$ 12,620
Other comprehensive income, before tax
Change in net unrealized (losses) gains on debt securities without other-than-temporary impairment	(296)	1,645	(2,443)	2,296
Reclassification adjustment for net losses recognized in net income		657		657
Net unrealized (losses) gains on available-for-sale debt securities	(296)	2,302	(2,443)	2,953
Net actuarial gain	93	1	92	134
Reclassification adjustment for amortization of prior service cost and net actuarial loss recognized in net income	71	65	142	129
Net unrealized gains on employee benefit plans	164	66	234	263
Other comprehensive (loss) income, before tax	(132)	2,368	(2,209)	3,216
Income tax (benefit) expense	(28)	888	(464)	1,206
Other comprehensive income (loss), net	(104)	1,480	(1,745)	2,010
Total comprehensive income	$ 8,962	$ 7,898	$ 16,189	$ 14,630