2012 FDIC-ASSISTED ACQUISITIONS (Details 6) (USD $)	3 Months Ended	12 Months Ended	0 Months Ended																									12 Months Ended
	Sep. 30, 2012	Dec. 31, 2012 Tennessee Commerce Bank ("TCB")	Jan. 27, 2012 Tennessee Commerce Bank ("TCB") RB&T	Jan. 27, 2012 Tennessee Commerce Bank ("TCB") Demand	Jan. 27, 2012 Tennessee Commerce Bank ("TCB") Demand Contractual Amount	Jan. 27, 2012 Tennessee Commerce Bank ("TCB") Money market accounts	Jan. 27, 2012 Tennessee Commerce Bank ("TCB") Money market accounts Contractual Amount	Jan. 27, 2012 Tennessee Commerce Bank ("TCB") Savings	Jan. 27, 2012 Tennessee Commerce Bank ("TCB") Savings Contractual Amount	Jan. 27, 2012 Tennessee Commerce Bank ("TCB") Individual retirement accounts	Jan. 27, 2012 Tennessee Commerce Bank ("TCB") Individual retirement accounts Contractual Amount	Jan. 27, 2012 Tennessee Commerce Bank ("TCB") Time deposits, $100,000 and over	Jan. 27, 2012 Tennessee Commerce Bank ("TCB") Time deposits, $100,000 and over Contractual Amount	Jan. 27, 2012 Tennessee Commerce Bank ("TCB") Other certificates of deposit	Jan. 27, 2012 Tennessee Commerce Bank ("TCB") Other certificates of deposit Contractual Amount	Jan. 27, 2012 Tennessee Commerce Bank ("TCB") Other certificates of deposit Fair Value Adjustments	Jan. 27, 2012 Tennessee Commerce Bank ("TCB") Brokered certificates of deposit	Jan. 27, 2012 Tennessee Commerce Bank ("TCB") Brokered certificates of deposit Contractual Amount	Jan. 27, 2012 Tennessee Commerce Bank ("TCB") Brokered certificates of deposit Fair Value Adjustments	Jan. 27, 2012 Tennessee Commerce Bank ("TCB") Total interest-bearing deposits	Jan. 27, 2012 Tennessee Commerce Bank ("TCB") Total interest-bearing deposits Contractual Amount	Jan. 27, 2012 Tennessee Commerce Bank ("TCB") Total interest-bearing deposits Fair Value Adjustments	Jan. 27, 2012 Tennessee Commerce Bank ("TCB") Total non interest-bearing deposits	Jan. 27, 2012 Tennessee Commerce Bank ("TCB") Total non interest-bearing deposits Contractual Amount	Jan. 27, 2012 Tennessee Commerce Bank ("TCB") Total deposits	Jan. 27, 2012 Tennessee Commerce Bank ("TCB") Total deposits Contractual Amount	Jan. 27, 2012 Tennessee Commerce Bank ("TCB") Total deposits Fair Value Adjustments	Dec. 31, 2012 First Commercial Bank ("FCB")	Sep. 07, 2012 First Commercial Bank ("FCB") Demand	Sep. 07, 2012 First Commercial Bank ("FCB") Demand Contractual Amount	Sep. 07, 2012 First Commercial Bank ("FCB") Money market accounts	Sep. 07, 2012 First Commercial Bank ("FCB") Money market accounts Contractual Amount	Sep. 07, 2012 First Commercial Bank ("FCB") Individual retirement accounts	Sep. 07, 2012 First Commercial Bank ("FCB") Individual retirement accounts Contractual Amount	Sep. 07, 2012 First Commercial Bank ("FCB") Time deposits, $100,000 and over	Sep. 07, 2012 First Commercial Bank ("FCB") Time deposits, $100,000 and over Contractual Amount	Sep. 07, 2012 First Commercial Bank ("FCB") Other certificates of deposit	Sep. 07, 2012 First Commercial Bank ("FCB") Other certificates of deposit Contractual Amount	Sep. 07, 2012 First Commercial Bank ("FCB") Brokered certificates of deposit	Sep. 07, 2012 First Commercial Bank ("FCB") Brokered certificates of deposit Contractual Amount	Sep. 07, 2012 First Commercial Bank ("FCB") Brokered certificates of deposit Fair Value Adjustments	Sep. 07, 2012 First Commercial Bank ("FCB") Total interest-bearing deposits	Sep. 07, 2012 First Commercial Bank ("FCB") Total interest-bearing deposits Contractual Amount	Sep. 07, 2012 First Commercial Bank ("FCB") Total interest-bearing deposits Fair Value Adjustments	Sep. 07, 2012 First Commercial Bank ("FCB") Total non interest-bearing deposits	Sep. 07, 2012 First Commercial Bank ("FCB") Total non interest-bearing deposits Contractual Amount	Sep. 07, 2012 First Commercial Bank ("FCB") Total deposits	Sep. 07, 2012 First Commercial Bank ("FCB") Total deposits Contractual Amount	Sep. 07, 2012 First Commercial Bank ("FCB") Total deposits Fair Value Adjustments
Fdic - assisted acquisitions of failed banks
Period from acquisition date for option to disclose repricing of acquired deposits portfolio			7 days
Composition of deposits assumed
Deposits assumed				$ 3,190,000	$ 3,190,000	$ 11,338,000	$ 11,338,000	$ 91,859,000	$ 91,859,000	$ 15,486,000	$ 15,486,000	$ 278,825,000	$ 278,825,000	$ 108,017,000	$ 108,003,000	$ 14,000	$ 418,980,000	$ 418,940,000	$ 40,000	$ 927,695,000	$ 927,641,000	$ 54,000	$ 19,754,000	$ 19,754,000	$ 947,449,000	$ 947,395,000	$ 54,000		$ 4,003,000	$ 4,003,000	$ 38,187,000	$ 38,187,000	$ 16,780,000	$ 16,780,000	$ 14,740,000	$ 14,740,000	$ 62,033,000	$ 62,033,000	$ 53,311,000	$ 53,314,000	$ (3,000)	$ 189,054,000	$ 189,057,000	$ (3,000)	$ 7,197,000	$ 7,197,000	$ 196,251,000	$ 196,254,000	$ (3,000)
Additional loss in excess of fair value adjustment related to payment of Federal Home Loan Bank (FHLB) advances	0
Acquisition and integration costs		1,800,000																										1,300,000
Estimated short-term retention bonuses for certain former FCB employees and short-term incentive bonuses for existing RB&T employees		724,000																										380,000
Estimated professional and consulting fees		642,000																										710,000
Amount for a long-term incentive program		$ 471,000																										$ 199,000
Profitability target period		2 years																										2 years