Comprehensive Income Reclassification out of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
INCOME BEFORE PROVISION FOR INCOME TAXES		$ 9,429	$ 8,328	$ 28,490	$ 26,013
Provision for Income Taxes		2,691	2,395	8,556	7,920
Net Income		(110)	(108)	(221)	(262)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Unrealized Gains and Losses on Available for Sale Securities [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Reclassification Adjustment for Securities Gains Included in Net Income, Before-Tax Amount		0	0	144	106
INCOME BEFORE PROVISION FOR INCOME TAXES		0	0	144	106
Provision for Income Taxes		0	0	(56)	(41)
Net Income		0	0	88	65
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Defined Benefit Plans Adjustment [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Amortization of Defined Benefit Pension Items, Prior-Service Costs, Before Tax	[1],[2]	3	13	7	41
Amortization of Net Retirement Plan Actuarial Loss, Before-Tax Amount	[1],[2]	(181)	(192)	(503)	(579)
INCOME BEFORE PROVISION FOR INCOME TAXES		(178)	(179)	(496)	(538)
Provision for Income Taxes		68	71	187	211
Net Income		$ (110)	$ (108)	$ (309)	$ (327)

[1] Amounts in parentheses indicate debits to profit/loss.

[2] These accumulated other comprehensive income components are included in the computation of net periodic pension cost.