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FAIR VALUES OF FINANCIAL INSTRUMENTS - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Loans held-for-sale $ 40,247   $ 40,247   $ 105,806
Fair value of held-for-sale MSRs 70   70   29,793
Net gains (losses) attributable to instrument-specific credit risk 0 $ 0 0 $ 0  
Valuation allowance for other real estate owned 0 $ 0 53 $ 9  
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 34,200   $ 34,200   $ 99,700
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 33,234   $ 33,234   $ 98,940
Significant Unobservable Inputs (Level 3) | Recurring          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Loans held-for-sale $ 33,234   $ 33,234   98,940
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