FAIR VALUE OF FINANCIAL INSTRUMENTS (Details 4) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015	Mar. 31, 2015	Dec. 31, 2014
Financial assets:
Cash and due from banks	$ 146,863	$ 118,518	$ 80,142
Federal funds sold and interest-bearing accounts	107,373	272,045	126,157
FDIC loss-share receivable	1,197	6,301	23,312	$ 31,351
Financial liabilities:
Other borrowings	110,531	39,000	43,851
Subordinated deferrable interest debentures	83,237	69,874	65,567
Carrying Value [Member]
Financial assets:
Cash and due from banks	146,863	118,518	80,142
Federal funds sold and interest-bearing accounts	107,373	272,045	126,157
Loans, net	4,495,066	3,971,974	2,837,538
FDIC loss-share receivable	1,197	6,301	23,312
Accrued interest receivable	20,940	21,274	15,332
Financial liabilities:
Deposits	5,230,787	4,879,290	3,480,231
Securities sold under agreements to repurchase	43,741	63,585	55,520
Other borrowings	110,531	39,000	43,851
Accrued interest payable	1,119	1,054	1,177
Subordinated deferrable interest debentures	83,237	69,874	65,567
Fair Value [Member]
Financial assets:
Cash and due from banks	146,863	118,518	80,142
Federal funds sold and interest-bearing accounts	107,373	272,045	126,157
Loans, net	4,518,521	3,982,606	2,885,524
FDIC loss-share receivable	(5,114)	(944)	9,990
Accrued interest receivable	20,940	21,274	15,332
Financial liabilities:
Deposits	5,231,556	4,880,294	3,481,470
Securities sold under agreements to repurchase	43,741	63,585	55,520
Other borrowings	110,531	39,000	43,851
Accrued interest payable	1,119	1,054	1,177
Subordinated deferrable interest debentures	66,783	52,785	47,055
Fair Value [Member] | Fair Value, Inputs, Level 1 [Member]
Financial assets:
Cash and due from banks	146,863	118,518	80,142
Federal funds sold and interest-bearing accounts	107,373	272,045	126,157
Loans, net	0	0	0
FDIC loss-share receivable	0	0	0
Accrued interest receivable	20,940	21,274	15,332
Financial liabilities:
Deposits	0	0	0
Securities sold under agreements to repurchase	43,741	63,585	55,520
Other borrowings	0	0	0
Accrued interest payable	1,119	1,054	1,177
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	5,231,556	4,880,294	3,481,470
Securities sold under agreements to repurchase	0	0	0
Other borrowings	110,531	39,000	43,851
Accrued interest payable	0	0	0
Subordinated deferrable interest debentures	66,783	52,785	47,055
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	4,518,521	3,982,606	2,885,524
FDIC loss-share receivable	(5,114)	(944)	9,990
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