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LOANS AND ALLOWANCE FOR LOAN LOSSES - Narrative (Detail)
 12 Months Ended
Dec. 31, 2017
USD ($)
note
Dec. 31, 2016
USD ($)
note
Dec. 31, 2015
USD ($)
Receivables [Abstract]      
Maximum percentage of loan-to-value ratio upon loan origination (no more than) 80.00%    
Maximum percentage of loan-to-value ratios of the value of the real estate taken as collateral (no greater than) 90.00%    
Amount of loan on which reviews have been made annually $ 500,000    
Amount of loan on which reviews require approval $ 250,000    
Period past due when loans are deemed impaired 90 days    
Number of notes split | note 2    
Appraisals, required period interval 18 months    
Minimum amount on which annual updated appraisals for criticized loans are required $ 250,000    
Percentage of strong loan-to-value (or lower) 70.00%    
Number of notes sold | note   1  
Note carrying amount   $ 5,946,000  
Proceeds from sale of note $ 2,195,000 5,100,000 $ 0
Net charge-off to the ALL   $ 846,000