LOANS - Additional Information (Detail) - USD ($)	3 Months Ended	9 Months Ended	12 Months Ended
	Sep. 30, 2017	Sep. 30, 2017	Dec. 31, 2016
Financing Receivable, Recorded Investment [Line Items]
Percentage of loan portfolio to earning assets		74.10%	73.80%
Troubled debt restructurings, balance	$ 7,300,000	$ 7,300,000	$ 4,100,000
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	67,225,000	67,225,000	$ 2,200,000
Foreclosed Real Estate Expense		1,000,000
Mortgage Loans on Real Estate, Commercial and Consumer, Net, Total	200,000	200,000
Financing Receivable, Modifications, Reserve	200,000	200,000
Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Non- Accrual	$ 90,000	$ 243,000