LOANS AND ALLOWANCE FOR LOAN LOSSES (Details 2) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Disclosures on loans acquired
Total carrying value of loans	$ 2,618,029	$ 2,650,197
Tennessee Commerce Bank ("TCB")
Disclosures on loans acquired
Contractually-required principal	33,980	41,677
Non-accretable difference	(6,127)	(10,394)
Accretable difference	(605)	(319)
Total carrying value of loans	27,248	30,964
First Commercial Bank ("FCB")
Disclosures on loans acquired
Contractually-required principal	109,116	139,156
Non-accretable difference	(23,354)	(28,870)
Accretable difference	(1,381)	(2,634)
Total carrying value of loans	84,381	107,652
TCB and FCB acquisitions
Disclosures on loans acquired
Contractually-required principal	143,096	180,833
Non-accretable difference	(29,481)	(39,264)
Accretable difference	(1,986)	(2,953)
Total carrying value of loans	$ 111,629	$ 138,616