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LOAN PORTFOLIO - Breakdown Between Accrual and Nonaccrual Status of TDRs (Detail) - Entity Loan Modification Program [Member] - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Mar. 31, 2018
Dec. 31, 2017
Financing Receivable Modifications [Line Items]        
Financing Receivable Modifications Recorded Investment Accrual Status $ 485,940 $ 478,928    
Financing Receivable Modifications Recorded Investment Nonaccrual Status 103,855 103,719    
Financing Receivable Modifications Recorded Investment 589,795 582,647 $ 572,376 $ 587,219
Residential Portfolio Segment [Member] | Other Loans [Member]        
Financing Receivable Modifications [Line Items]        
Financing Receivable Modifications Recorded Investment Accrual Status 272,661 271,766    
Financing Receivable Modifications Recorded Investment Nonaccrual Status 56,084 62,136    
Financing Receivable Modifications Recorded Investment 328,745 333,902    
Commercial Portfolio Segment [Member] | Commercial And Industrial Sector [Member]        
Financing Receivable Modifications [Line Items]        
Financing Receivable Modifications Recorded Investment Accrual Status 64,386 66,603    
Financing Receivable Modifications Recorded Investment Nonaccrual Status 7,962 8,318    
Financing Receivable Modifications Recorded Investment 72,348 74,921    
Commercial Portfolio Segment [Member] | Construction Loans [Member]        
Financing Receivable Modifications [Line Items]        
Financing Receivable Modifications Recorded Investment 5,100      
Commercial Portfolio Segment [Member] | Construction Loans [Member] | Residential [Member]        
Financing Receivable Modifications [Line Items]        
Financing Receivable Modifications Recorded Investment Accrual Status 0 0    
Financing Receivable Modifications Recorded Investment Nonaccrual Status 532 762    
Financing Receivable Modifications Recorded Investment 532 762    
Commercial Portfolio Segment [Member] | Construction Loans [Member] | Commercial [Member]        
Financing Receivable Modifications [Line Items]        
Financing Receivable Modifications Recorded Investment Accrual Status 0 0    
Financing Receivable Modifications Recorded Investment Nonaccrual Status 0 0    
Financing Receivable Modifications Recorded Investment 0 0    
Commercial Portfolio Segment [Member] | Construction Loans [Member] | Land [Member]        
Financing Receivable Modifications [Line Items]        
Financing Receivable Modifications Recorded Investment Accrual Status 989 1,071    
Financing Receivable Modifications Recorded Investment Nonaccrual Status 3,593 3,694    
Financing Receivable Modifications Recorded Investment 4,582 4,765    
Commercial Portfolio Segment [Member] | Mortgage Receivable [Member]        
Financing Receivable Modifications [Line Items]        
Financing Receivable Modifications Recorded Investment Accrual Status 126,151 116,830    
Financing Receivable Modifications Recorded Investment Nonaccrual Status 29,182 21,119    
Financing Receivable Modifications Recorded Investment 155,333 137,949    
Consumer Portfolio Segment [Member]        
Financing Receivable Modifications [Line Items]        
Financing Receivable Modifications Recorded Investment 28,300      
Consumer Portfolio Segment [Member] | Other Loans [Member]        
Financing Receivable Modifications [Line Items]        
Financing Receivable Modifications Recorded Investment Accrual Status 9,048 9,025    
Financing Receivable Modifications Recorded Investment Nonaccrual Status 675 1,357    
Financing Receivable Modifications Recorded Investment 9,723 10,382    
Consumer Portfolio Segment [Member] | Auto loans [Member]        
Financing Receivable Modifications [Line Items]        
Financing Receivable Modifications Recorded Investment Accrual Status 11,176 11,842    
Financing Receivable Modifications Recorded Investment Nonaccrual Status 5,784 6,189    
Financing Receivable Modifications Recorded Investment 16,960 18,031    
Consumer Portfolio Segment [Member] | Finance leases loans [Member]        
Financing Receivable Modifications [Line Items]        
Financing Receivable Modifications Recorded Investment Accrual Status 1,529 1,791    
Financing Receivable Modifications Recorded Investment Nonaccrual Status 43 144    
Financing Receivable Modifications Recorded Investment $ 1,572 $ 1,935