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INCOME TAXES - Additional Information (Detail) - USD ($)	3 Months Ended			6 Months Ended
	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Income tax expense (benefit)	$ 1,779,000		$ (12,753,000)	$ (4,574,000)	$ (19,224,000)
Effective tax rate	11.40%		(534.70%)	(28.00%)	(363.40%)
Tax credit	$ 1,900,000		$ 15,700,000	$ 9,200,000	$ 24,500,000
Valuation allowance	0			0		$ 0
Net deferred tax asset	42,300,000			42,300,000		31,100,000
Valuation Allowance [Line Items]
Unrecognized tax benefits	1,100,000			1,100,000		1,000,000
Unrecognized tax benefits that would impact the effective tax rate	940,000			940,000
Accrued interest or penalties	$ 0			0		$ 0
ASU 2018-02 | Accumulated Other Comprehensive Income (Loss)
Valuation Allowance [Line Items]
Stranded tax effects		$ 496,000		496,000
ASU 2018-02 | Retained Earnings
Valuation Allowance [Line Items]
Stranded tax effects		$ (496,000)		(496,000)
Sale of mortgage servicing rights
Valuation Allowance [Line Items]
Increase (decrease) in deferred tax asset				3,000,000
Unrealized gain on securities available-for-sale
Valuation Allowance [Line Items]
Increase (decrease) in deferred tax asset				$ 10,400,000

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Tax Cuts And Jobs Act Of 2017, Reclassification From AOCI To Retained Earnings, Tax Effect

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