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UPDATE ON IMPACTS OF NATURAL DISASTERS- Additional information (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Liability For Catastrophe Claims [Line Items]        
Proceeds from the settlement of insurance claims   $ 7,614 $ 0  
Insurance proceeds in excess of losses incurred   478 0  
Hurricane [Member]        
Liability For Catastrophe Claims [Line Items]        
Financing Receivable Allowance For Credit Losses $ 24,900 24,900 $ 66,500 $ 55,600
Net Loan Loss Reserve Release 2,800 11,200    
Increase Decrease In Deposits Excluding Brokered Certificates Of Deposits   $ 602,400    
Percentage Of Non Interest Bearing Demand Deposits   27.00%    
Insurance Settlements Receivable 4,200 $ 4,200    
Insurance proceeds in excess of losses incurred   500    
Increase Decrease In Non Interest Bearing Demand Deposits   $ 487,400    
Hurricane [Member] | Consumer Portfolio Segment [Member]        
Liability For Catastrophe Claims [Line Items]        
Financing Receivable Allowance For Credit Losses Write Offs 10,900      
Hurricane [Member] | Wholly Owned Properties [Member]        
Liability For Catastrophe Claims [Line Items]        
Proceeds from the settlement of insurance claims 6,800      
Loans Receivable [Member] | Hurricane [Member]        
Liability For Catastrophe Claims [Line Items]        
Proceeds from the settlement of insurance claims $ 800