Accumulated Other Comprehensive Income ("AOCI") (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance		$ 201,380	$ 197,835	$ 173,780
Net unrealized gains (losses) on securities available for sale, net of tax		23	(3,729)	(1,159)
Tax effect		12	(2,007)	(626)
Reclassification adjustment for realized gains on securities, net of tax		(528)	(543)	(564)
Change in unfunded pension liability, net of tax		(152)	108	349
Tax effect		(284)	(293)	(303)
Reclass stranded tax effects from tax rate change		(545)
Tax effect		82	(58)	(189)
Ending Balance		208,717	201,380	197,835
Net Unrealized Gains (Losses) on Securities
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance		(150)	4,122	5,845
Net unrealized gains (losses) on securities available for sale, net of tax		23	(3,729)	(1,159)
Reclassification adjustment for realized gains on securities, net of tax		(528)	(543)	(564)
Reclass stranded tax effects from tax rate change		(141)
Ending Balance		(796)	(150)	4,122
Adjustments Related to Pension Benefits
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance		(1,724)	(1,832)	(2,181)
Change in unfunded pension liability, net of tax		(152)	108	349
Reclass stranded tax effects from tax rate change		(404)
Ending Balance		(2,280)	(1,724)	(1,832)
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance		(1,874)	2,290	3,664
Reclass stranded tax effects from tax rate change	[1]	(545)
Ending Balance		$ (3,076)	$ (1,874)	$ 2,290

[1] See Note 1 for Adoption of New Accounting Standards