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INCOME TAXES - Additional Information (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Income tax expense (benefit)	$ (5,600,000)	$ 3,600,000	$ 1,400,000	$ (102,000)
Effective tax rate (percent)	28.40%	24.30%	12.90%	(0.30%)
Tax credit	$ 900,000	$ 412,000	$ 2,600,000	$ 9,600,000
Valuation allowance	0		0		$ 0
Net deferred tax asset	46,000,000.0		46,000,000.0		49,400,000
Valuation Allowance [Line Items]
Unrecognized tax benefits	1,300,000		1,300,000		1,200,000
Unrecognized tax benefits that would impact the effective tax rate	1,100,000		1,100,000
Accrued interest or penalties	$ 0		0		$ 0
Year-to-date temporary book-tax differences
Valuation Allowance [Line Items]
Increase (decrease) in deferred tax asset			(2,000,000.0)
Unrealized gain on securities available-for-sale
Valuation Allowance [Line Items]
Increase (decrease) in deferred tax asset			(6,100,000)
Reclassification of tax credit to deferred tax assets
Valuation Allowance [Line Items]
Increase (decrease) in deferred tax asset			$ 4,600,000

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Amount, after allocation of valuation allowances and deferred tax liability, of deferred tax asset attributable to deductible differences and carryforwards, without jurisdictional netting.

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The amount of estimated penalties and interest accrued as of the balance sheet date arising from income tax examinations.

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