GOODWILL AND OTHER INTANGIBLE ASSETS - Additional Information (Detail) - USD ($)		12 Months Ended
	Oct. 31, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 01, 2017	Jul. 01, 2017
Business Acquisition [Line Items]
Goodwill and other intangible assets, net		$ 19,787,000	$ 19,926,000
Accumulated impairment losses		0
Trademark intangible, carrying value		100,000	100,000
Goodwill and trademark intangible asset impairment charges	$ 0	0
Other Operating Expenses
Business Acquisition [Line Items]
Amortization expense		$ 500,000	200,000	$ 41,000
Core Deposits
Business Acquisition [Line Items]
Weighted average amortization period remaining		8 years 8 months
Minimum | Core Deposits
Business Acquisition [Line Items]
Estimated useful life of core deposit intangibles		10 years
Maximum | Core Deposits
Business Acquisition [Line Items]
Estimated useful life of core deposit intangibles		15 years
Citizens Bancshares, Inc.
Business Acquisition [Line Items]
Goodwill		$ 9,100,000				$ 9,053,000
Core deposit intangible			1,500,000			$ 1,462,000
BOJ Bancshares, Inc.
Business Acquisition [Line Items]
Goodwill		$ 5,700,000			$ 5,687,000
Core deposit intangible			$ 1,000,000		$ 1,018,000