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LOAN PORTFOLIO - Loan Portfolio Held for Investment (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Financial Information [Line Items]    
Loans and leases receivable gross carrying value $ 8,850,476 $ 8,886,873
Less: allowance for loan and lease losses (231,843) (205,603)
Loans held for investment, net 8,618,633 8,681,270
Residential Mortgage [Member]    
Financial Information [Line Items]    
Loans and leases receivable gross carrying value 3,290,957 3,296,031
Commercial Real Estate Portfolio Segment [Member]    
Financial Information [Line Items]    
Loans and leases receivable gross carrying value 1,614,972 1,568,808
Commercial And Industrial Sector [Member]    
Financial Information [Line Items]    
Loans and leases receivable gross carrying value [1] 2,083,253 2,180,455
Commercial Portfolio Segment [Member]    
Financial Information [Line Items]    
Loans and leases receivable gross carrying value 3,809,622 3,874,214
Finance Leases [Member]    
Financial Information [Line Items]    
Loans and leases receivable gross carrying value 257,462 233,335
Other Consumer Loans [Member]    
Financial Information [Line Items]    
Loans and leases receivable gross carrying value 1,492,435 1,483,293
Construction Loans [Member]    
Financial Information [Line Items]    
Loans and leases receivable gross carrying value 111,397 124,951
Consumer Loan [Member]    
Financial Information [Line Items]    
Loans and leases receivable gross carrying value $ 648,104 $ 635,335
[1]
As of December 31, 2017 and 2016, includes $833.5 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.