NATURE OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Goodwill and other intangible assets (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Finite Lived Intangible Assets [Line Items]
Net intangible assets	$ 29,934,000	$ 40,893,000	$ 7,573,000
Goodwill impairment	0	0
Core Deposits [Member]
Finite Lived Intangible Assets [Line Items]
Net intangible assets	$ 28,571,000	$ 35,842,000	$ 3,488,000