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REVENUE FROM CONTACTS WITH CUSTOMERS - Additional Information (Detail) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Jun. 30, 2021
Dec. 31, 2020
Jun. 30, 2020
Dec. 31, 2019
Revenue from External Customer [Line Items]                
Contract liability $ 1,556,000 $ 2,233,000 $ 1,556,000 $ 2,233,000 $ 1,989,000 $ 2,151,000 $ 2,314,000 $ 2,476,000
Total Revenue 214,689,000 178,630,000 636,577,000 503,581,000        
Decrease in Contract with Customer, Liability (400,000) (100,000) (600,000) (300,000)        
Noninterest Income, Other Operating Income 12,840,000 10,132,000 35,455,000 29,263,000        
Insurance commissions [Member]                
Revenue from External Customer [Line Items]                
Total Revenue $ 0 $ 0 $ 3,300,000          
Hurricane [Member]                
Revenue from External Customer [Line Items]                
Noninterest Income, Other Operating Income       $ 5,000,000.0