SUBORDINATED NOTES PAYABLE (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Debt Instrument [Line Items]
Subordinated note issued	$ 113,649		$ 113,612
Interest rate	7.00%
Subordinated Debt [Member]
Debt Instrument [Line Items]
Subordinated note issued			$ 115,000
Subordinated debt, Due date	Jun. 30, 2027
Subordinated debt, Maturity date	Jun. 15, 2027
Interest rate			4.50%
Interest expense	$ 1,330	$ 0
Subordinated Debt [Member] | LIBOR [Member]
Debt Instrument [Line Items]
Variable rate basis			three-month LIBOR
Basis Spread on Variable Rate			2.66%