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LOAN PORTFOLIO - Breakdown Between Accrual and Nonaccrual Status of TDRs (Detail) - TDR [Member] - USD ($)
$ in Thousands
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Financing Receivable Modifications [Line Items]            
Financing Receivable Modifications Recorded Investment Accrual Status $ 482,046   $ 478,928      
Financing Receivable Modifications Recorded Investment Nonaccrual 100,343   103,719      
Financing Receivable Modifications Recorded Investment 582,389 $ 589,795 582,647 $ 557,196 $ 572,376 $ 587,219
Residential Portfolio Segment [Member] | Other Loans Member [Member]            
Financing Receivable Modifications [Line Items]            
Financing Receivable Modifications Recorded Investment Accrual Status 271,067   271,766      
Financing Receivable Modifications Recorded Investment Nonaccrual 55,636   62,136      
Financing Receivable Modifications Recorded Investment 326,703   333,902      
Commercial Portfolio Segment [Member] | Commercial And Industrial Sector [Member]            
Financing Receivable Modifications [Line Items]            
Financing Receivable Modifications Recorded Investment Accrual Status 63,216   66,603      
Financing Receivable Modifications Recorded Investment Nonaccrual 7,294   8,318      
Financing Receivable Modifications Recorded Investment 70,510   74,921      
Commercial Portfolio Segment [Member] | Construction Loans [Member]            
Financing Receivable Modifications [Line Items]            
Financing Receivable Modifications Recorded Investment 5,000          
Commercial Portfolio Segment [Member] | Construction Loans [Member] | Residential Mortgage [Member]            
Financing Receivable Modifications [Line Items]            
Financing Receivable Modifications Recorded Investment Accrual Status 523   0      
Financing Receivable Modifications Recorded Investment Nonaccrual 0   762      
Financing Receivable Modifications Recorded Investment 523   762      
Commercial Portfolio Segment [Member] | Construction Loans [Member] | Commercial Loan [Member]            
Financing Receivable Modifications [Line Items]            
Financing Receivable Modifications Recorded Investment Accrual Status 0   0      
Financing Receivable Modifications Recorded Investment Nonaccrual 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 980   1,071      
Financing Receivable Modifications Recorded Investment Nonaccrual 3,460   3,694      
Financing Receivable Modifications Recorded Investment 4,440   4,765      
Commercial Portfolio Segment [Member] | Mortgage Receivable [Member]            
Financing Receivable Modifications [Line Items]            
Financing Receivable Modifications Recorded Investment Accrual Status 125,793   116,830      
Financing Receivable Modifications Recorded Investment Nonaccrual 27,573   21,119      
Financing Receivable Modifications Recorded Investment 153,366   137,949      
Consumer Portfolio Segment [Member]            
Financing Receivable Modifications [Line Items]            
Financing Receivable Modifications Recorded Investment 26,800          
Consumer Portfolio Segment [Member] | Other Loans Member [Member]            
Financing Receivable Modifications [Line Items]            
Financing Receivable Modifications Recorded Investment Accrual Status 8,485   9,025      
Financing Receivable Modifications Recorded Investment Nonaccrual 616   1,357      
Financing Receivable Modifications Recorded Investment 9,101   10,382      
Consumer Portfolio Segment [Member] | Consumer Auto Loans [Member]            
Financing Receivable Modifications [Line Items]            
Financing Receivable Modifications Recorded Investment Accrual Status 10,385   11,842      
Financing Receivable Modifications Recorded Investment Nonaccrual 5,739   6,189      
Financing Receivable Modifications Recorded Investment 16,124   18,031      
Consumer Portfolio Segment [Member] | Finance Lease [Member]            
Financing Receivable Modifications [Line Items]            
Financing Receivable Modifications Recorded Investment Accrual Status 1,597   1,791      
Financing Receivable Modifications Recorded Investment Nonaccrual 25   144      
Financing Receivable Modifications Recorded Investment $ 1,622   $ 1,935