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INCOME TAXES - Additional Information (Detail) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Mar. 31, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Income Tax Disclosure [Abstract] |  |  |  |  |  |
Income tax expense (benefit) | $ 3,301,000 |  | $ (3,939,000) | $ (1,273,000) | $ (23,163,000) |
Effective tax rate | 24.00% |  | (27.80%) | (4.20%) | (119.00%) |
Tax credit | $ 412,000 |  | $ 8,800,000 | $ 9,600,000 | $ 33,300,000 |
Valuation allowance | 0 |  |  | 0 |  | $ 0
Net deferred tax asset | 47,900,000 |  |  | 47,900,000 |  | 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 | 980,000 |  |  | 980,000 |  |
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 |  |  |  | 6,100,000 |  |
Unrealized gain on securities available-for-sale |  |  |  |  |  |
Valuation Allowance [Line Items] |  |  |  |  |  |
Increase (decrease) in deferred tax asset |  |  |  | $ 11,500,000 |  |

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- Definition Tax Cuts And Jobs Act Of 2017, Reclassification From AOCI To Retained Earnings, Tax Effect + References No definition available. + Details
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- Definition Amount, after allocation of valuation allowances and deferred tax liability, of deferred tax asset attributable to deductible differences and carryforwards, without jurisdictional netting. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
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