STATEMENTS OF COMPREHENSIVE INCOME (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
STATEMENTS OF COMPREHENSIVE INCOME [Abstract]
Net income	$ 2,321	$ 1,738	$ 3,947	$ 4,032
Interest rate swaps:
Changes in designated interest rate swaps	65	0	60	0
Income tax (expense)	(26)	0	(24)	0
Unrealized holding gain on interest rate swaps	39	0	36	0
Amount Included In Net Periodic Benefit Cost
Net actuarial loss	120	135	240	270
Prior service credit	(236)	(19)	(472)	(38)
Transition obligation	0	15	0	30
Adjustment to post-retirement benefit plan	0	(1,034)	0	(1,034)
Income tax expense (benefit)	46	360	92	308
Change in post-retirement benefit plan	(70)	(543)	(140)	(464)
Other comprehensive income (loss)	(31)	(543)	(104)	(464)
Comprehensive Income	$ 2,290	$ 1,195	$ 3,843	$ 3,568