FAIR VALUE OF FINANCIAL INSTRUMENTS (Details 4) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014	Sep. 30, 2014	Dec. 31, 2013
Financial assets:
Cash and due from banks	$ 114,396	$ 78,036	$ 69,421	$ 62,955
Federal funds sold and interest-bearing accounts	120,925	92,323	40,165
FDIC loss-share receivable	4,506	31,351	38,233	$ 65,441
Financial liabilities:
Other borrowings	39,000	78,881	147,409
Subordinated deferrable interest debentures	69,600	65,325	65,084
Carrying Value [Member]
Financial assets:
Cash and due from banks	114,396	78,026	69,421
Federal funds sold and interest-bearing accounts	120,925	92,323	40,165
Loans, net	3,720,713	2,783,763	2,778,026
FDIC loss-share receivable	4,506	31,351	38,233
Accrued interest receivable	20,062	17,023	17,171
Financial liabilities:
Deposits	4,530,523	3,431,149	3,373,119
Securities sold under agreements to repurchase	51,506	73,310	32,351
Other borrowings	39,000	78,881	147,409
Accrued interest payable	1,149	1,382	1,444
Subordinated deferrable interest debentures	69,600	65,325	65,084
Fair Value [Member]
Financial assets:
Cash and due from banks	114,396	78,026	69,421
Federal funds sold and interest-bearing accounts	120,925	92,323	40,165
Loans, net	3,711,522	2,785,627	2,773,291
FDIC loss-share receivable	(4,042)	18,764	21,397
Accrued interest receivable	20,062	17,023	17,171
Financial liabilities:
Deposits	4,531,851	3,432,059	3,374,055
Securities sold under agreements to repurchase	51,506	73,310	32,351
Other borrowings	39,000	78,881	147,409
Accrued interest payable	1,149	1,382	1,444
Subordinated deferrable interest debentures	51,617	46,564	46,214
Fair Value [Member] | Fair Value, Inputs, Level 1 [Member]
Financial assets:
Cash and due from banks	114,396	78,026	69,421
Federal funds sold and interest-bearing accounts	120,925	92,323	40,165
Loans, net	0	0	0
FDIC loss-share receivable	0	0	0
Accrued interest receivable	20,062	17,023	17,171
Financial liabilities:
Deposits	0	0	0
Securities sold under agreements to repurchase	51,506	73,310	32,351
Other borrowings	0	0	0
Accrued interest payable	1,149	1,382	1,444
Subordinated deferrable interest debentures	0	0	0
Fair Value [Member] | Fair Value, Inputs, Level 2 [Member]
Financial assets:
Cash and due from banks	0	0	0
Federal funds sold and interest-bearing accounts	0	0	0
Loans, net	0	0	0
FDIC loss-share receivable	0	0	0
Accrued interest receivable	0	0	0
Financial liabilities:
Deposits	4,531,851	3,432,059	3,374,055
Securities sold under agreements to repurchase	0	0	0
Other borrowings	39,000	78,881	147,409
Accrued interest payable	0	0	0
Subordinated deferrable interest debentures	51,617	46,564	46,214
Fair Value [Member] | Fair Value, Inputs, Level 3 [Member]
Financial assets:
Cash and due from banks	0	0	0
Federal funds sold and interest-bearing accounts	0	0	0
Loans, net	3,711,522	2,785,627	2,773,291
FDIC loss-share receivable	(4,042)	18,764	21,397
Accrued interest receivable	0	0	0
Financial liabilities:
Deposits	0	0	0
Securities sold under agreements to repurchase	0	0	0
Other borrowings	0	0	0
Accrued interest payable	0	0	0
Subordinated deferrable interest debentures	$ 0	$ 0	$ 0