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INCOME TAXES - Narrative (Detail) - USD ($)
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Tax Disclosure [Abstract]      
Income tax expense related to net security gains $ 405,000 $ 483,000 $ 673,000
Statutory federal tax rate 34.00% 34.00% 35.00%
Increase in income tax expense due to application of new rate   $ 185,000  
Tax Cuts And Jobs Act Of 2017,change in tax rate, deferred tax asset, provisional deferred income tax expense $ 2,635,000    
Reclass to other assets from deferred tax assets 5,343,000    
Income tax penalties or interest 0 0 $ 0
Accrued penalties $ 0 $ 0