SUBORDINATED DEBENTURES AND SUBORDINATED NOTES - Additional Information (Details) - USD ($)		12 Months Ended
	Dec. 08, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	May 19, 2017
Subordinated Borrowing [Line Items]
Subordinated debentures and subordinated notes		$ 47,737,000	$ 47,492,000
Proceeds from issuance of subordinated notes, net	$ 33,900,000	0	33,876,000	$ 0
Utilized loan proceeds	32,800,000
Outstanding subordinated debentures		22,200,000
Purchase discount on subordinated debt		8,100,000
Notes
Subordinated Borrowing [Line Items]
Subordinated debentures and subordinated notes	$ 35,000,000	$ 35,000,000	35,000,000		$ 34,000,000
Interest rate	8.50%	8.50%			8.50%
Redemption price percentage	100.00%
Proceeds from issuance of subordinated notes, net		$ 33,709,000	33,885,000
Unamortized debt issuance costs		$ (1,291,000)	$ (1,115,000)
Repurchased face amount					$ 34,000,000
Unregistered Notes
Subordinated Borrowing [Line Items]
Subordinated debentures and subordinated notes					$ 1,000,000
LIBOR
Subordinated Borrowing [Line Items]
Interest rate spread on variable rate		1.69428%
LIBOR | Notes
Subordinated Borrowing [Line Items]
Interest rate spread on variable rate	6.685%