Accumulated Comprehensive Income (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2017	Mar. 31, 2016
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance		$ 123,268
Other comprehensive income (loss) before reclassifications (net of tax)		46	$ 1,117
Amounts reclassified from accumulated other comprehensive income (loss) (net of tax)		(75)	22
Other comprehensive income (loss), net of tax		(29)	1,139
Ending Balance		124,956
Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance		(1,392)	(236)
Ending Balance		(1,421)	903
Unrealized Gain (Loss) on Available for Sale Securities [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	[1]	1,306	2,204
Other comprehensive income (loss) before reclassifications (net of tax)	[1]	46	1,117
Amounts reclassified from accumulated other comprehensive income (loss) (net of tax)	[1]	(114)	(18)
Other comprehensive income (loss), net of tax	[1]	(68)	1,099
Ending Balance	[1]	1,238	3,303
Defined Benefit Pension Items [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	[1]	(2,698)	(2,440)
Other comprehensive income (loss) before reclassifications (net of tax)	[1]	0	0
Amounts reclassified from accumulated other comprehensive income (loss) (net of tax)	[1]	39	40
Other comprehensive income (loss), net of tax	[1]	39	40
Ending Balance	[1]	$ (2,659)	$ (2,400)

[1] Amounts in parentheses indicate debits to the Consolidated Balance Sheet