Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2018	Mar. 31, 2017
Statement Of Income And Comprehensive Income [Abstract]
Net income		$ 1,004	$ 1,994
Other comprehensive (loss) income:
Unrealized (losses) gains arising during the period on available-for-sale securities, net of income tax impact of ($475) and $195, respectively		(1,788)	379
Reclassification adjustment for net gain on sales of available-for-sale securities included in net income, net of income tax impact of $20 and $3, respectively	[1]	(78)	(5)
Change in defined benefit plans, net of income tax impact of $0 and ($1), respectively	[2]	(1)	(3)
Total other comprehensive (loss) income		(1,867)	371
Total comprehensive (loss) income		$ (863)	$ 2,365

[1] Amounts are included in net gain on sales of investment securities on the Consolidated Statements of Income as a separate element within total noninterest income.

[2] Amounts are included in the computation of net periodic benefit cost and are included in salaries and employee benefits on the Consolidated Statements of Income as a separate element within total noninterest expense.