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GOODWILL AND OTHER INTANGIBLES - Gross Amount and Accumulated Amortization of Other Intangible Assets (Detail) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2019
Dec. 31, 2018
Jun. 30, 2012
Finite Lived Intangible Assets [Line Items]      
Net carrying amount $ 3,900 $ 4,300  
Core Deposits [Member]      
Finite Lived Intangible Assets [Line Items]      
Gross amount 51,664 51,664  
Accumulated amortization (47,761) (47,329)  
Net carrying amount $ 3,903 $ 4,335  
Remaining amortization period 5 years 7 months 6 days 6 years  
Customer Relationships [Member] | Credit Card [Member]      
Finite Lived Intangible Assets [Line Items]      
Gross amount $ 24,465 $ 24,465 $ 24,500
Accumulated amortization (19,806) (18,763)  
Net carrying amount $ 4,659 $ 5,702  
Remaining amortization period 2 years 4 months 24 days 2 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 (521) (445)  
Net carrying amount $ 546 $ 622  
Remaining amortization period 3 years 6 months 4 years