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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