STATEMENT OF COMPREHENSIVE INCOME (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
STATEMENT OF COMPREHENSIVE INCOME [Abstract]
Net income	$ 2,294	$ 2,346
Amounts included in net periodic benefit cost:
Net actuarial loss	135	107
Prior service credit	(19)	(14)
Transition asset	15	15
Income tax expense	(52)	(43)
Change in post-retirement benefit plan	79	65
Other comprehensive income (loss)	79	65
Comprehensive Income	$ 2,373	$ 2,411