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OTHER EQUITY SECURITIES - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Schedule Of Other Assets [Line Items]      
Capital stock par value $ 100    
Book value of investment in FHLB stock $ 40,900 $ 40,800  
Dividend income from FHLB stock 2,100 1,500 $ 1,100
Carrying value of other equity security 2,200 2,200  
Gain Loss On Sale Of Securities Net $ 371 $ 6,104 $ 0