OTHER BORROWINGS (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Other Borrowings [Line Items]
Other borrowings	$ 525,669	$ 492,321
Fixed Rate Advance [Member]
Other Borrowings [Line Items]
Advance from correspondent bank	445,000	0
Fixed Rate Advance One [Member]
Other Borrowings [Line Items]
Advance from correspondent bank	5,002	5,006
Daily Rate Credit From Federal Home Loan Bank [Member]
Other Borrowings [Line Items]
Advance from correspondent bank	0	150,000
Fixed Rate Advance Two [Member]
Other Borrowings [Line Items]
Advance from correspondent bank	0	292,500
Fixed Rate Advance Three [Member]
Other Borrowings [Line Items]
Advance from correspondent bank	0	4,002
Subordinated Debt One [Member]
Other Borrowings [Line Items]
Subordinated debt issued	73,755	0
Correspondent Bank Advances [Member]
Other Borrowings [Line Items]
Other borrowings	70	77
Correspondent Bank Advances One [Member]
Other Borrowings [Line Items]
Other borrowings	1,842	1,886
Revolving Credit Facility [Member]
Other Borrowings [Line Items]
Long-term Line of Credit	0	38,000
Correspondent Bank Advances Two [Member]
Other Borrowings [Line Items]
Long-term Line of Credit	$ 0	$ 850