STATEMENTS OF COMPREHENSIVE INCOME (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
STATEMENTS OF COMPREHENSIVE INCOME [Abstract]
Net income	$ 2,073	$ 1,626
Designated interest rate swaps:
Changes in fair value	(21)	(5)
Income tax benefit	8	2
Unrealized holding loss on designated interest rate swaps	(13)	(3)
Amounts Included In Net Periodic Benefit Cost
Amortization of net actuarial loss	98	120
Amortization of prior service credit	(236)	(236)
Income tax benefit	55	46
Change in post-retirement benefit plan	(83)	(70)
Other comprehensive loss	(96)	(73)
Comprehensive income	$ 1,977	$ 1,553