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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
Sep. 30, 2018
Dec. 31, 2017
Jun. 30, 2012
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract]      
Finite Lived Intangible Assets Amortization Expense Remainder Of Fiscal Year $ 860    
Finite Lived Intangible Assets Amortization Expense Year Two 3,088    
Finite Lived Intangible Assets Amortization Expense Year Three 2,851    
Finite Lived Intangible Assets Amortization Expense Year Four 2,658    
Finite Lived Intangible Assets Amortization Expense Year Five 915    
Finite Lived Intangible Assets Amortization Expense After Year Five 1,150    
Core Deposits [Member]      
Finite Lived Intangible Assets [Line Items]      
Gross amount 51,664 $ 51,664  
Accumulated amortization (47,079) (46,186)  
Net carrying amount $ 4,585 $ 5,478  
Remaining amortization period 6 years 3 months 18 days 7 years  
Customer Relationships [Member] | Credit Card [Member]      
Finite Lived Intangible Assets [Line Items]      
Gross amount $ 24,465 $ 24,465 $ 24,500
Accumulated amortization (18,189) (16,465)  
Net carrying amount $ 6,276 $ 8,000  
Remaining amortization period 3 years 1 month 6 days 3 years 10 months 24 days  
Customer Relationships [Member] | Insurance Customer Intangible [Member]      
Finite Lived Intangible Assets [Line Items]      
Gross amount $ 1,067 $ 1,067  
Accumulated amortization (406) (292)  
Net carrying amount $ 661 $ 775  
Remaining amortization period 4 years 3 months 18 days 5 years