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LOAN PORTFOLIO - Loan Portfolio Held for Investment (Parenthetical) (Detail) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Jun. 30, 2018
Loans and Leases Receivable Disclosure [Line Items]      
Loans and Leases Receivable, Gross $ 9,113,955 $ 8,858,123 $ 8,640,291
Commercial Portfolio Segment [Member]      
Loans and Leases Receivable Disclosure [Line Items]      
Loans and Leases Receivable, Gross 3,930,293 3,750,202  
Commercial Portfolio Segment [Member] | Commercial And Industrial Sector [Member]      
Loans and Leases Receivable Disclosure [Line Items]      
Loans and Leases Receivable, Gross 2,279,685 2,148,111 $ 2,009,049
Commercial Portfolio Segment [Member] | Commercial And Industrial Sector [Member] | Commercial loans secured by real estate      
Loans and Leases Receivable Disclosure [Line Items]      
Loans and Leases Receivable, Gross $ 735,800 $ 796,800