SUBORDINATED DEBENTURES AND SUBORDINATED NOTES - Summary of Subordinated Debentures Outstanding (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Subordinated Borrowing [Line Items]
Trust Preferred Securities Outstanding	$ 47,737	$ 47,492
Subordinated Debt Owed to Trusts	$ 22,200
Callable period	5 years
Patriot Bancshares Capital Trust I
Subordinated Borrowing [Line Items]
Trust Preferred Securities Outstanding	$ 5,000
Subordinated Debt Owed to Trusts	5,155
Patriot Bancshares Capital Trust II
Subordinated Borrowing [Line Items]
Trust Preferred Securities Outstanding	16,500
Subordinated Debt Owed to Trusts	$ 17,011
LIBOR
Subordinated Borrowing [Line Items]
Interest rate spread on variable rate	1.69428%
LIBOR | Minimum | Patriot Bancshares Capital Trust I
Subordinated Borrowing [Line Items]
Interest rate spread on variable rate	1.85%
LIBOR | Minimum | Patriot Bancshares Capital Trust II
Subordinated Borrowing [Line Items]
Interest rate spread on variable rate	1.80%
LIBOR | Maximum | Patriot Bancshares Capital Trust I
Subordinated Borrowing [Line Items]
Interest rate spread on variable rate	11.90%
LIBOR | Maximum | Patriot Bancshares Capital Trust II
Subordinated Borrowing [Line Items]
Interest rate spread on variable rate	11.90%