FAIR VALUE MEASURES (Details 4) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Financial assets:
Cash and due from banks	$ 127,164	$ 118,518
Federal funds sold and interest-bearing accounts	0	5,500
Loans, net	5,212,153	3,971,974
FDIC loss-share receivable	0	6,301
Accrued interest receivable	22,278	21,274
Financial liabilities:
Deposits	5,575,163	4,879,290
Securities sold under agreements to repurchase	53,505	63,585
Other borrowings	492,321	39,000
FDIC loss-share payable	6,313	0
Accrued interest payable	1,501	1,054
Subordinated deferrable interest debentures	84,228	69,874
Fair Value [Member]
Financial assets:
Cash and due from banks	127,164	118,518
Federal funds sold and interest-bearing accounts	71,221	272,045
Loans, net	5,236,034	3,982,606
FDIC loss-share receivable		(944)
Accrued interest receivable	22,278	21,274
Financial liabilities:
Deposits	5,575,288	4,880,294
Securities sold under agreements to repurchase	53,505	63,585
Other borrowings	492,321	39,000
FDIC loss-share payable	8,243
Accrued interest payable	1,501	1,054
Subordinated deferrable interest debentures	67,321	52,785
Fair Value [Member] | Fair Value, Inputs, Level 1 [Member]
Financial assets:
Cash and due from banks	127,164	118,518
Federal funds sold and interest-bearing accounts	71,221	272,045
Loans, net	0	0
FDIC loss-share receivable		0
Accrued interest receivable	22,278	21,274
Financial liabilities:
Deposits	0	0
Securities sold under agreements to repurchase	53,505	63,585
Other borrowings	0	0
FDIC loss-share payable	0
Accrued interest payable	1,501	1,054
Subordinated deferrable interest debentures	0	0
Fair Value [Member] | Fair Value, Inputs, Level 2 [Member]
Financial assets:
Cash and due from banks	0	0
Federal funds sold and interest-bearing accounts	0	0
Loans, net	0	0
FDIC loss-share receivable		0
Accrued interest receivable	0	0
Financial liabilities:
Deposits	5,575,288	4,880,294
Securities sold under agreements to repurchase	0	0
Other borrowings	492,321	39,000
FDIC loss-share payable	0
Accrued interest payable	0	0
Subordinated deferrable interest debentures	67,321	52,785
Fair Value [Member] | Fair Value, Inputs, Level 3 [Member]
Financial assets:
Cash and due from banks	0	0
Federal funds sold and interest-bearing accounts	0	0
Loans, net	5,236,034	3,982,606
FDIC loss-share receivable		(944)
Accrued interest receivable	0	0
Financial liabilities:
Deposits	0	0
Securities sold under agreements to repurchase	0	0
Other borrowings	0	0
FDIC loss-share payable	8,243
Accrued interest payable	0	0
Subordinated deferrable interest debentures	$ 0	$ 0