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LOAN PORTFOLIO - Breakdown Between Accrual and Nonaccrual Status of TDRs (Detail) - Entity Loan Modification Program [Member] - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Financing Receivable Modifications [Line Items]        
Financing Receivable Modifications Recorded Investment Accrual Status $ 478,928 $ 374,695    
Financing Receivable Modifications Recorded Investment Nonaccrual Status 103,719 212,524    
Financing Receivable, Modifications, Recorded Investment 582,647 587,219 $ 647,048 $ 661,591
Commercial Portfolio Segment [Member] | Commercial And Industrial Sector [Member]        
Financing Receivable Modifications [Line Items]        
Financing Receivable Modifications Recorded Investment Accrual Status 66,603 41,536    
Financing Receivable Modifications Recorded Investment Nonaccrual Status 8,318 52,576    
Financing Receivable, Modifications, Recorded Investment 74,921 94,112    
Commercial Portfolio Segment [Member] | Mortgage Receivable [Member]        
Financing Receivable Modifications [Line Items]        
Financing Receivable Modifications Recorded Investment Accrual Status 116,830 23,329    
Financing Receivable Modifications Recorded Investment Nonaccrual Status 21,119 27,483    
Financing Receivable, Modifications, Recorded Investment 137,949 50,812    
Finance Leases Portfolio Segment [Member] | Consumer Loan [Member]        
Financing Receivable Modifications [Line Items]        
Financing Receivable Modifications Recorded Investment Accrual Status 1,791 1,968    
Financing Receivable Modifications Recorded Investment Nonaccrual Status 144 216    
Financing Receivable, Modifications, Recorded Investment 1,935 2,184    
Other Loans [Member] | Residential Portfolio Segment [Member]        
Financing Receivable Modifications [Line Items]        
Financing Receivable Modifications Recorded Investment Accrual Status 271,766 280,729    
Financing Receivable Modifications Recorded Investment Nonaccrual Status 62,136 83,201    
Financing Receivable, Modifications, Recorded Investment 333,902 363,930    
Other Loans [Member] | Consumer Portfolio Segment [Member]        
Financing Receivable Modifications [Line Items]        
Financing Receivable Modifications Recorded Investment Accrual Status 9,025 10,294    
Financing Receivable Modifications Recorded Investment Nonaccrual Status 1,357 1,489    
Financing Receivable, Modifications, Recorded Investment 10,382 11,783    
Construction loans [Member] | Residential Portfolio Segment [Member]        
Financing Receivable Modifications [Line Items]        
Financing Receivable Modifications Recorded Investment Accrual Status 0 0    
Financing Receivable Modifications Recorded Investment Nonaccrual Status 762 217    
Financing Receivable, Modifications, Recorded Investment 762 217    
Construction loans [Member] | Commercial Portfolio Segment [Member]        
Financing Receivable Modifications [Line Items]        
Financing Receivable Modifications Recorded Investment Accrual Status 0 0    
Financing Receivable Modifications Recorded Investment Nonaccrual Status 0 35,100    
Financing Receivable, Modifications, Recorded Investment 0 35,100    
Construction loans [Member] | Commercial Portfolio Segment [Member] | Land [Member]        
Financing Receivable Modifications [Line Items]        
Financing Receivable Modifications Recorded Investment Accrual Status 1,071 1,291    
Financing Receivable Modifications Recorded Investment Nonaccrual Status 3,694 5,185    
Financing Receivable, Modifications, Recorded Investment 4,765 6,476    
Auto loans [Member] | Consumer Portfolio Segment [Member]        
Financing Receivable Modifications [Line Items]        
Financing Receivable Modifications Recorded Investment Accrual Status 11,842 15,548    
Financing Receivable Modifications Recorded Investment Nonaccrual Status 6,189 7,057    
Financing Receivable, Modifications, Recorded Investment $ 18,031 $ 22,605