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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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- 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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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + 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 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
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- Definition The amount of estimated penalties and interest accrued as of the balance sheet date arising from income tax examinations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32718-109319 + Details
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