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GOODWILL AND OTHER INTANGIBLES - Gross Amount and Accumulated Amortization of Other Intangible Assets (Detail) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2022
Dec. 31, 2021
Finite Lived Intangible Assets [Line Items]    
Net carrying amount $ 23,245 $ 29,934
Core Deposits [Member]    
Finite Lived Intangible Assets [Line Items]    
Gross amount 87,544 87,544
Accumulated amortization (64,726) (58,973)
Net carrying amount $ 22,818 $ 28,571
Remaining amortization period (in years) 7 years 3 months 18 days 8 years
Customer Relationships [Member] | Credit Card [Member]    
Finite Lived Intangible Assets [Line Items]    
Gross amount $ 3,800 $ 3,800
Accumulated amortization (3,424) (2,602)
Net carrying amount $ 376 $ 1,198
Remaining amortization period (in years) 10 months 24 days 1 year 8 months 12 days
Customer Relationships [Member] | Insurance Customer Intangible [Member]    
Finite Lived Intangible Assets [Line Items]    
Gross amount $ 1,067 $ 1,067
Accumulated amortization (1,016) (902)
Net carrying amount $ 51 $ 165
Remaining amortization period (in years) 3 months 18 days 1 year 1 month 6 days