COMMON STOCK (Details) (USD $) In Millions, except Share data	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Common Stock [Abstract]
Beginning balance (in shares)			29,872,825
New issues during period [Abstract]
Dividend reinvestment plan (in shares)			105,524
Stock-based compensation plan (in shares)			81,491
Ending balance (in shares)	30,059,840		30,059,840
Par value of common stock (in dollars per share)	$ 1.25		$ 1.25
Net excess over par value recorded in premium on common stock			$ 7.1
Incremental shares included in diluted earnings per share	76,257	127,064	84,072	105,056