STATEMENTS OF COMPREHENSIVE INCOME (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
STATEMENTS OF COMPREHENSIVE INCOME [Abstract]
Net Income (Loss)	$ 1,809	$ 2,694	$ 4,131	$ 4,836
Interest rate swaps:
Changes in designated interest rate swaps	(117)	(574)	(164)	(235)
Income tax (expense) benefit	46	229	65	94
Unrealized holding gains (loss) on interest rate swaps	(71)	(345)	(99)	(141)
Amount Included In Net Periodic Benefit Cost [Abstract]
Net actuarial loss	135	107	270	214
Prior service credit	(19)	(14)	(38)	(28)
Transition asset	15	15	30	30
Adjustment to post-retirement benefit plan	(1,034)	0	(1,034)	0
Income tax expense	360	(43)	308	(86)
Change in post-retirement benefit plan	(543)	65	(464)	130
Other comprehensive income (loss)	(614)	(280)	(563)	(11)
Comprehensive Income	$ 1,195	$ 2,414	$ 3,568	$ 4,825