OTHER BORROWINGS (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Other Borrowings [Line Items]
Other borrowings	$ 679,591	$ 492,321
Fixed Rate Advance [Member]
Other Borrowings [Line Items]
Advance from correspondent bank	350,000	0
Fixed Rate Advance One [Member]
Other Borrowings [Line Items]
Advance from correspondent bank	0	5,006
Daily Rate Credit From Federal Home Loan Bank [Member]
Other Borrowings [Line Items]
Advance from correspondent bank	254,000	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	73,730	0
Correspondent Bank Advances [Member]
Other Borrowings [Line Items]
Other borrowings	63	77
Correspondent Bank Advances One [Member]
Other Borrowings [Line Items]
Other borrowings	1,798	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