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LOAN PORTFOLIO - Loan Restructuring and Effect on Allowance for Loan and Lease Losses (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Financing Receivable Allowance For Credit Losses [Line Items]        
Financing Receivable, Modifications, Recorded Investment $ 587,219 $ 647,048 $ 661,591 $ 694,453
Provision for loan and lease losses 144,254 86,733 172,045  
Allowance for loan losses at end of year 231,843 205,603    
Loans Split [Member]        
Financing Receivable Allowance For Credit Losses [Line Items]        
Financing Receivable, Modifications, Recorded Investment 35,577 36,971 39,329  
Amount charged-off 0 0 0  
Provision for loan and lease losses (1,294) 4,279 131  
Allowance for loan losses at end of year $ 3,846 $ 5,141 $ 862