EARNINGS PER SHARE DATA (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Basic [Abstract]
Weighted average shares outstanding (in shares)	14,392,000	14,327,000	14,360,000	14,303,000
Net income	$ 12,177,000	$ 7,610,000	$ 23,823,000	$ 13,953,000
Convertible preferred stock dividend	(22,000)	(22,000)	(45,000)	(45,000)
Net income attributable to common shareholders	12,155,000	7,588,000	23,778,000	13,908,000
Per share amount (in dollars per share)	$ 0.84	$ 0.53	$ 1.66	$ 0.97
Diluted [Abstract]
Weighted average shares outstanding (in shares)	14,392,000	14,327,000	14,360,000	14,303,000
Assumed conversion of convertible preferred stock (in shares)	840,000	840,000	840,000	840,000
Total (in shares)	15,232,000	15,167,000	15,200,000	15,143,000
Net income attributable to common shareholders	12,155,000	7,588,000	23,778,000	13,908,000
Convertible preferred stock dividend	22,000	22,000	45,000	45,000
Net income for diluted earnings per share	$ 12,177,000	$ 7,610,000	$ 23,823,000	$ 13,953,000
Per share amount (in dollars per share)	$ 0.80	$ 0.50	$ 1.57	$ 0.92