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LOAN PORTFOLIO - Loan Portfolio Held for Investment (Detail) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Sep. 30, 2016
Financial Information [Line Items]      
Loans held for investment $ 8,877,214 $ 8,886,873 $ 8,863,654
Less: allowance for loan and lease losses (230,870) (205,603)  
Loans held for investment, net 8,646,344 8,681,270  
Construction Loans [Member]      
Financial Information [Line Items]      
Loans held for investment 129,460 124,951  
Residential Mortgage [Member]      
Financial Information [Line Items]      
Loans held for investment 3,274,340 3,296,031  
Commercial Real Estate Portfolio Segment [Member]      
Financial Information [Line Items]      
Loans held for investment 1,601,638 1,568,808  
Commercial Portfolio Segment [Member]      
Financial Information [Line Items]      
Loans held for investment 3,875,334 3,874,214  
Commercial And Industrial Sector [Member]      
Financial Information [Line Items]      
Loans held for investment [1] 2,144,236 2,180,455  
Other Consumer Loans [Member]      
Financial Information [Line Items]      
Loans held for investment 1,481,456 1,483,293  
Finance Leases [Member]      
Financial Information [Line Items]      
Loans held for investment $ 246,084 $ 233,335  
[1]
(1) As of September 30, 2017 and December 31, 2016, includes $884.0 million and $853.9 million, respectively, of commercial loans that are secured by real estate but are not dependent upon the real estate for repayment.