FAIR VALUE MEASURES (Details 4) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015	Sep. 30, 2015
Financial assets:
Cash and due from banks	$ 123,270	$ 118,518	$ 114,396
Federal funds sold and interest-bearing accounts	90,801	272,045	120,925
Loans, net	4,922,395	3,971,974	3,720,713
FDIC loss-share receivable	0	6,301	4,506
Accrued interest receivable	21,775	21,274	20,062
Financial liabilities:
Deposits	5,306,098	4,879,290	4,530,523
Securities sold under agreements to repurchase	42,647	63,585	51,506
FDIC loss-share payable	7,775	0	0
Other borrowings	373,461	39,000	39,000
Accrued interest payable	1,282	1,054	1,149
Subordinated deferrable interest debentures	83,898	69,874	69,600
Fair Value [Member]
Financial assets:
Cash and due from banks	123,270	118,518	114,396
Federal funds sold and interest-bearing accounts	90,801	272,045	120,925
Loans, net	4,918,360	3,982,606	3,711,522
FDIC loss-share receivable		(944)	(4,042)
Accrued interest receivable	21,775	21,274	20,062
Financial liabilities:
Deposits	5,305,463	4,880,294	4,531,851
Securities sold under agreements to repurchase	42,647	63,585	51,506
FDIC loss-share payable	10,141
Other borrowings	373,461	39,000	39,000
Accrued interest payable	1,282	1,054	1,149
Subordinated deferrable interest debentures	66,252	52,785	51,617
Fair Value [Member] | Fair Value, Inputs, Level 1 [Member]
Financial assets:
Cash and due from banks	123,270	118,518	114,396
Federal funds sold and interest-bearing accounts	90,801	272,045	120,925
Loans, net	0	0	0
FDIC loss-share receivable		0	0
Accrued interest receivable	21,775	21,274	20,062
Financial liabilities:
Deposits	0	0	0
Securities sold under agreements to repurchase	42,647	63,585	51,506
FDIC loss-share payable	0
Other borrowings	0	0	0
Accrued interest payable	1,282	1,054	1,149
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
Accrued interest receivable	0	0	0
Financial liabilities:
Deposits	5,305,463	4,880,294	4,531,851
Securities sold under agreements to repurchase	0	0	0
FDIC loss-share payable	0
Other borrowings	373,461	39,000	39,000
Accrued interest payable	0	0	0
Subordinated deferrable interest debentures	66,252	52,785	51,617
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	4,918,360	3,982,606	3,711,522
FDIC loss-share receivable		(944)	(4,042)
Accrued interest receivable	0	0	0
Financial liabilities:
Deposits	0	0	0
Securities sold under agreements to repurchase	0	0	0
FDIC loss-share payable	10,141
Other borrowings	0	0	0
Accrued interest payable	0	0	0
Subordinated deferrable interest debentures	$ 0	$ 0	$ 0