CREDIT QUALITY ASSESSMENT - Narrative (Detail) - USD ($)	3 Months Ended	9 Months Ended	12 Months Ended
	Mar. 31, 2020	Sep. 30, 2020	Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans placed on non-accrual		$ 30,500,000
Reversal of uncollected accrued interest		300,000
Period increase (decrease)	$ 0
Other real estate owned		1,389,000	$ 1,482,000
Consumer mortgage loan		100,000
Restructured Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans restructured during the period		2,800,000	2,400,000
Individual reserves		900,000	400,000
Other real estate owned		$ 1,400,000	$ 1,500,000