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INCOME TAXES - Additional Information (Detail) - USD ($)	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Income tax expense (benefit)	$ (6,400,000)	$ (6,500,000)
Effective tax rate	(881.10%)	(222.80%)
Tax credit	$ 7,300,000	$ 8,800,000
Valuation allowance	0		$ 0
Net deferred tax asset	43,200,000		31,100,000
Valuation Allowance [Line Items]
Unrecognized tax benefits	1,100,000		1,000,000
Unrecognized tax benefits that would impact the effective tax rate	901,000
Accrued interest or penalties	0		$ 0
ASU 2018-02 | Accumulated Other Comprehensive Income (Loss)
Valuation Allowance [Line Items]
Stranded tax effects	496,000
ASU 2018-02 | Retained Earnings
Valuation Allowance [Line Items]
Stranded tax effects	(496,000)
Sale of mortgage servicing rights
Valuation Allowance [Line Items]
Increase (decrease) in deferred tax asset	7,900,000
Unrealized gain on securities available-for-sale
Valuation Allowance [Line Items]
Increase (decrease) in deferred tax asset	$ 7,200,000

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