LEASES - Narrative (Details) $ in Millions	3 Months Ended
	Mar. 31, 2020 USD ($)	Feb. 21, 2020 branch_location	Mar. 01, 2019 branch_location
Lessee, Lease, Description [Line Items]
ROU assets | $	$ 4.2
Lease liabilities | $	$ 4.3
Minimum
Lessee, Lease, Description [Line Items]
Remaining terms	4 years
Maximum
Lessee, Lease, Description [Line Items]
Remaining terms	12 years
Mainland
Lessee, Lease, Description [Line Items]
Number of branches leased			2
Number of branch locations acquired			3
Plains Capital Bank
Lessee, Lease, Description [Line Items]
Number of branch locations acquired		2