FAIR VALUE MEASUREMENTS - Additional Information (Detail) - USD ($)	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Fair Value Measurements Disclosure [Line Items]
Transfer of assets and liabilities between the hierarchy levels	$ 0	$ 0
Allocated allowance for loan losses	5,700,000
Provision for fair value measurements included in allowance for loan losses	2,800,000
Carrying amount of OREO	8,600,000
Written down of OREO	7,800,000
Loss from OREO included in earnings	800,000
Fair Value, Nonrecurring [Member]
Fair Value Measurements Disclosure [Line Items]
Impaired loans, carrying amount	7,600,000
Allocated allowance for loan losses			$ 5,000,000
Mortgage Servicing Rights [Member] | Fair Value, Nonrecurring [Member]
Fair Value Measurements Disclosure [Line Items]
Servicing asset, gross	42,600,000
Valuation allowance for impairment of recognized servicing assets, additions for expenses	(7,700,000)
Servicing asset	$ 33,400,000