SUBORDINATED DEBENTURES AND SUBORDINATED NOTES (Details) - USD ($)	6 Months Ended
	Jun. 30, 2018	Dec. 31, 2017	May 19, 2017	Dec. 08, 2016
Subordinated Borrowing [Line Items]
Subordinated notes	$ 33,782,000	$ 33,709,000		$ 33,900,000
Proceeds utilized	32,800,000
Unamortized debt issuance costs	(1,218,000)	(1,291,000)
Outstanding subordinated debentures	22,200,000
Purchase discount on subordinated debt	$ 7,900,000
Period of callable debentures	5 years
Subordinated Notes, Fixed to Floating 8.50%
Subordinated Borrowing [Line Items]
Subordinated notes	$ 35,000,000	$ 35,000,000	$ 34,000,000	$ 35,000,000.0
Interest rate			8.50%	8.50%
Subordinated Notes, Fixed to Floating 8.50% | After December 15, 2021 | LIBOR
Subordinated Borrowing [Line Items]
Interest rate spread on variable rate	6.685%
Subordinated Unregistered Notes, Fixed to Floating 8.50%
Subordinated Borrowing [Line Items]
Subordinated notes			$ 1,000,000
Trust Preferred Securities Subject to Mandatory Redemption [Member] | LIBOR
Subordinated Borrowing [Line Items]
Interest rate spread on variable rate	2.33575%
Patriot Bancshares Capital Trust I
Subordinated Borrowing [Line Items]
Outstanding subordinated debentures	$ 5,155,000
Trust preferred securities outstanding	$ 5,000,000
Patriot Bancshares Capital Trust I | Minimum
Subordinated Borrowing [Line Items]
Interest rate spread on variable rate	1.85%
Patriot Bancshares Capital Trust I | Maximum
Subordinated Borrowing [Line Items]
Interest rate spread on variable rate	11.90%
Patriot Bancshares Capital Trust II
Subordinated Borrowing [Line Items]
Outstanding subordinated debentures	$ 17,011,000
Trust preferred securities outstanding	$ 16,500,000
Patriot Bancshares Capital Trust II | Minimum
Subordinated Borrowing [Line Items]
Interest rate spread on variable rate	1.80%
Patriot Bancshares Capital Trust II | Maximum
Subordinated Borrowing [Line Items]
Interest rate spread on variable rate	11.90%