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FAIR VALUES OF FINANCIAL INSTRUMENTS - Additional Information (Detail) - USD ($) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Loans held-for-sale | $ 29,672,000 |  | $ 29,672,000 |  | $ 105,806,000
Fair value of held-for-sale MSRs | 66,000 |  | 66,000 |  | 29,793,000
Net gains (losses) attributable to instrument-specific credit risk | 0 | $ 0 | 0 | $ 0 |
Valuation allowance for other real estate owned | 0 | $ 134,000 | 53,000 | $ 143,000 |
Discontinued Operations |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Loans held-for-sale that were 90 days or more past due and still accruing | 0 |  | 0 |  | 0
U.S. government agency and U.S. government sponsored enterprise residential mortgage-backed securities |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Aggregated unpaid principal balance | 26,200,000 |  | $ 26,200,000 |  | $ 99,700,000
Insured |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Expected loss rate |  |  | 1.55% |  | 1.55%
Uninsured |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Expected loss rate |  |  | 20.00% |  | 20.00%
Significant Unobservable Inputs (Level 3) |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Loans held-for-sale | 25,756,000 |  | $ 25,756,000 |  | $ 98,940,000
Fair value of held-for-sale MSRs | 66,000 |  | 66,000 |  | 29,800,000
Significant Unobservable Inputs (Level 3) | Recurring |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Loans held-for-sale | 25,756,000 |  | 25,756,000 |  | 98,940,000
Mortgage servicing rights at fair value | 2,029,000 |  | 2,029,000 |  | 31,852,000
Significant Unobservable Inputs (Level 3) | Recurring | U.S. government agency and U.S. government sponsored enterprise residential mortgage-backed securities |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Loans held-for-sale |  |  |  |  | 66,000,000
Mortgages | Significant Unobservable Inputs (Level 3) |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Mortgage servicing rights at fair value | $ 2,000,000 |  | $ 2,000,000 |  | $ 2,100,000

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