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OTHER BORROWINGS - Components of Other Borrowings (Detail) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Subordinated Borrowing [Line Items]    
Junior subordinated debentures $ 184,150 $ 184,150
Junior Subordinated Debt [Member]    
Subordinated Borrowing [Line Items]    
Junior subordinated debentures 184,150 184,150
Junior Subordinated Debt [Member] | due June 17, 2034 [Member] | Statutory Trust One [Member]    
Subordinated Borrowing [Line Items]    
Junior subordinated debentures 65,593 65,593
Junior Subordinated Debt [Member] | due September 20, 2034 [Member] | Statutory Trust Two [Member]    
Subordinated Borrowing [Line Items]    
Junior subordinated debentures $ 118,557 $ 118,557