Comprehensive Income Reclassification out of Accumulated Other Comprehensive Income (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2013		Sep. 30, 2012		Sep. 30, 2013		Sep. 30, 2012
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
INCOME BEFORE PROVISION FOR INCOME TAXES	$ 7,933		$ 8,288		$ 22,636		$ 23,998
Provision for Income Taxes	2,310		2,540		6,625		7,368
Net Income	5,623		5,748		16,011		16,630
Total Reclassifications for the period, net of tax	(236)	[1]	(185)	[1]	(382)	[1]	(244)	[1]
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	[1]	64	[1]	540	[1]	709	[1]
INCOME BEFORE PROVISION FOR INCOME TAXES	0	[1]	64	[1]	540	[1]	709	[1]
Provision for Income Taxes	0	[1]	(25)	[1]	(214)	[1]	(281)	[1]
Net Income	0	[1]	39	[1]	326	[1]	428	[1]
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)	[1],[2]	7	[1],[2]	(1)	[1],[2]	22	[1],[2]
Amortization of Net Retirement Plan Actuarial Loss, Before-Tax Amount	(390)	[1],[2]	(377)	[1],[2]	(1,173)	[1],[2]	(1,134)	[1],[2]
INCOME BEFORE PROVISION FOR INCOME TAXES	(391)	[1]	(370)	[1]	(1,174)	[1]	(1,112)	[1]
Provision for Income Taxes	155	[1]	146	[1]	466	[1]	440	[1]
Net Income	$ (236)	[1]	$ (224)	[1]	$ (708)	[1]	$ (672)	[1]

[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 (see pension footnote for additional details.).