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GOODWILL AND OTHER INTANGIBLES - Gross Amount and Accumulated Amortization of Other Intangible Assets (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2012
Jun. 30, 2012
Finite Lived Intangible Assets [Line Items]          
Gross amount         $ 24,500
Core Deposits [Member]          
Finite Lived Intangible Assets [Line Items]          
Gross amount   $ 51,664 $ 51,664    
Accumulated amortization [1]   (46,186) (44,466)    
Finite Lived Intangible Assets Net   $ 5,478 $ 7,198    
Remaining amortization period   7 years 8 years 1 month 6 days    
Purchased Credit Card Relationship Intangible [Member]          
Finite Lived Intangible Assets [Line Items]          
Gross amount   $ 24,465 $ 24,465    
Finite lived Intangible Assets Acquired 1       $ 24,500  
Accumulated amortization [2]   (16,465) (13,934)    
Finite Lived Intangible Assets Net   $ 8,000 $ 10,531    
Remaining amortization period   3 years 10 months 24 days 5 years    
Customer Related Intangible Assets Member          
Finite Lived Intangible Assets [Line Items]          
Gross amount   $ 1,067 $ 1,067    
Finite lived Intangible Assets Acquired 1 $ 1,100        
Accumulated amortization [3]   (292) (140)    
Finite Lived Intangible Assets Net   $ 775 $ 927    
Remaining amortization period   5 years 6 years 1 month 6 days    
[1]
(1) For the years ended December 31, 2017 and 2016, the amortization expense of core deposit intangibles amounted to $1.7 million and $2.0 million, respectively.
[2]
(2) For the years ended December 31, 2017 and 2016, the amortization expense of the purchased credit card relationship intangible amounted to $2.5 million and $2.8 million, respectively.
[3]
(3) For the years ended December 31, 2017 and 2016, the amortization expense of the insurance customer relationship intangible amounted to $0.2 million and $0.1 million, respectively.