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LOAN PORTFOLIO - Loans Held for Investment on Which Accrual of Interest Income had been Discontinued (Parenthetical) (Detail) - USD ($)
$ in Thousands
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Accounts Notes And Loans Receivable [Line Items]            
Loans held for sale $ 33,630   $ 43,186      
Loans and Leases Receivable, Gross 9,113,955   8,858,123 $ 8,640,291    
Entity Loan Modification Program [Member]            
Accounts Notes And Loans Receivable [Line Items]            
Financing Receivable Modifications Recorded Investment Accrual Status 482,046   478,928      
PCI loans            
Accounts Notes And Loans Receivable [Line Items]            
Loans and Leases Receivable, Gross 141,706 $ 144,443 146,640 $ 152,242 $ 155,281 $ 158,174
Nonperforming Financing Receivable [Member]            
Accounts Notes And Loans Receivable [Line Items]            
Loans held for sale $ 7,100   $ 16,100