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GOODWILL AND OTHER INTANGIBLE ASSETS, NET - Additional Information (Detail) - USD ($) |  | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | ---
Aug. 31, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Mar. 31, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017 | Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |
Goodwill |  | $ 37,144,000 |  |  | $ 37,144,000 |  | $ 37,144,000 |
Goodwill write-off | $ 0 |  |  |  |  |  |  |
Aggregate amortization expense |  | $ 693,000 | $ 916,000 |  | $ 2,363,000 | $ 3,062,000 |  |
Trade name intangibles |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |
Intangible asset write-off |  |  |  | $ 90,000 |  |  |  |
Core deposit intangibles |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |
Weighted average amortization period |  |  |  |  | 5 years 6 months 7 days |  |  |
Core deposit intangibles | Minimum |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |
Amortization period of other intangible assets |  |  |  |  | 4 years |  |  |
Core deposit intangibles | Maximum |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |
Amortization period of other intangible assets |  |  |  |  | 10 years |  |  |
Customer relationship intangible |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |
Intangible asset write-off |  |  |  | 246,000 |  |  |  |
Commercial Banking |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |  | $ 37,100,000
Mortgage Banking |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |  | $ 2,100,000
Goodwill write-off |  |  |  | $ 2,100,000 |  |  |  |

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