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LOAN PORTFOLIO - Loan Restructuring and Effect on Allowance for Loan and Lease Losses (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Jun. 30, 2018
Dec. 31, 2017
Jun. 30, 2017
Dec. 31, 2016
Financing Receivable Allowance For Credit Losses [Line Items]                
Financing Receivable, Modifications, Recorded Investment $ 625,720 $ 585,795 $ 625,720 $ 585,795 $ 557,196 $ 587,219 $ 568,543 $ 647,048
Amount charged-off 36,312 19,369 93,368 107,751        
Provision 11,524 75,013 51,604 118,551        
Loans and Leases Receivable, Allowance 200,563 230,870 200,563 230,870 $ 222,035 231,843 $ 173,485 $ 205,603
Loans Split [Member]                
Financing Receivable Allowance For Credit Losses [Line Items]                
Financing Receivable, Modifications, Recorded Investment 65,706 35,603 65,706 35,603        
Amount charged-off     1,137 0        
Provision     1,407 (1,080)        
Loans and Leases Receivable, Allowance 4,116 $ 4,061 4,116 $ 4,061        
Accrual [Member]                
Financing Receivable Allowance For Credit Losses [Line Items]                
Financing Receivable, Modifications, Recorded Investment $ 510,846   $ 510,846     $ 374,695