Accumulated Comprehensive Income (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance				$ 119,760
Other comprehensive income (loss) before reclassifications (net of tax)		$ (692)	$ 722	1,609	$ 258
Amounts reclassified from accumulated other comprehensive income (loss) (net of tax)		40	(51)	17	(183)
Other comprehensive income (loss), net of tax		(652)	671	1,626	75
Ending Balance		125,550		125,550
Accumulated Other Comprehensive Income [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance		2,042	171	(236)	767
Ending Balance		1,390	842	1,390	842
Unrealized Gains (Loss) on Available for Sale Securities [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	[1]	4,403	2,430	2,204	3,093
Other comprehensive income (loss) before reclassifications (net of tax)	[1]	(692)	722	1,609	258
Amounts reclassified from accumulated other comprehensive income (loss) (net of tax)	[1]	0	(85)	(102)	(284)
Other comprehensive income (loss), net of tax	[1]	(692)	637	1,507	(26)
Ending Balance	[1]	3,711	3,067	3,711	3,067
Defined Benefit Pension Items [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	[1]	(2,361)	(2,259)	(2,440)	(2,326)
Other comprehensive income (loss) before reclassifications (net of tax)	[1]	0	0	0	0
Amounts reclassified from accumulated other comprehensive income (loss) (net of tax)	[1]	40	34	119	101
Other comprehensive income (loss), net of tax	[1]	40	34	119	101
Ending Balance	[1]	$ (2,321)	$ (2,225)	$ (2,321)	$ (2,225)

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