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GOODWILL AND OTHER INTANGIBLES - Additional Information (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Jun. 30, 2012
Finite Lived Intangible Assets [Line Items]        
Goodwill $ 28,100 $ 28,100    
Purchase credit card relationship intangible amount       $ 24,500
Amortization expense 4,403 4,896 $ 5,143  
Business Combination Finite Lived Intangible Assets Net 3,700 4,400    
Purchased Credit Card Relationship Intangible [Member]        
Finite Lived Intangible Assets [Line Items]        
Purchase credit card relationship intangible amount $ 24,465 $ 24,465    
Amortization period of purchased credit card relationship intangible 3 years 10 months 24 days 5 years    
Amortization expense $ 2,500 $ 2,800    
Core Deposits [Member]        
Finite Lived Intangible Assets [Line Items]        
Purchase credit card relationship intangible amount $ 51,664 $ 51,664    
Amortization period of purchased credit card relationship intangible 7 years 8 years 1 month 6 days    
Amortization expense $ 1,700 $ 2,000    
Customer Related Intangible Assets Member        
Finite Lived Intangible Assets [Line Items]        
Purchase credit card relationship intangible amount $ 1,067 $ 1,067    
Amortization period of purchased credit card relationship intangible 5 years 6 years 1 month 6 days    
Amortization expense $ 200 $ 100