CREDIT QUALITY ASSESSMENT - Narrative (Detail) - USD ($) $ in Thousands	6 Months Ended	9 Months Ended	12 Months Ended
	Jun. 30, 2021	Sep. 30, 2021	Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Period increase (decrease)	$ 0	$ 0
Other real estate owned		1,105	$ 1,455
Reversal of uncollected accrued interest		100
Non-accrual status
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans placed on non-accrual		7,635	85,286
Restructured Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans restructured during the period		13,500	4,500
Individual reserves		200	1,000
Other real estate owned		$ 1,100	$ 1,500