BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended	3 Months Ended		0 Months Ended	3 Months Ended
	Jun. 30, 2013 segment item	Dec. 31, 2012 First Commercial Bank ("FCB")	Sep. 30, 2012 First Commercial Bank ("FCB")	Sep. 07, 2012 First Commercial Bank ("FCB") First Quarter 2013 Recast Adjustments	Mar. 31, 2013 First Commercial Bank ("FCB") First Quarter 2013 Recast Adjustments
BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
Number of operating segments	3
Number of banking centers	44
Adjustments to the FCB acquired assets
Bargain purchase gain	$ 1,324	$ 712	$ 27,100	$ 1,324	$ 1,300