Comprehensive Income Reclassification out of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
INCOME BEFORE PROVISION FOR INCOME TAXES		$ 9,594	$ 9,155	$ 19,061	$ 17,685
Provision for Income Taxes		2,947	2,850	5,865	5,525
Net Income		(12)	(99)	(111)	(153)
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		144	16	144	106
INCOME BEFORE PROVISION FOR INCOME TAXES		144	16	144	106
Provision for Income Taxes		(56)	(6)	(56)	(41)
Net Income		88	10	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]	4	15	7	28
Amortization of Net Retirement Plan Actuarial Loss, Before-Tax Amount	[1],[2]	(168)	(194)	(334)	(387)
INCOME BEFORE PROVISION FOR INCOME TAXES		(164)	(179)	(327)	(359)
Provision for Income Taxes		64	70	128	141
Net Income		$ (100)	$ (109)	$ (199)	$ (218)

[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.