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LOAN PORTFOLIO - Loan Portfolio Held for Investment (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Financial Information [Line Items]    
Loans and leases receivable gross carrying value $ 8,886,873 $ 9,112,382
Less: allowance for loan and lease losses (205,603) (240,710)
Loans held for investment, net 8,681,270 8,871,672
Residential Mortgage [Member]    
Financial Information [Line Items]    
Loans and leases receivable gross carrying value 3,296,031 3,344,719
Commercial Real Estate Portfolio Segment [Member]    
Financial Information [Line Items]    
Loans and leases receivable gross carrying value 1,568,808 1,537,806
Commercial And Industrial Sector [Member]    
Financial Information [Line Items]    
Loans and leases receivable gross carrying value [1] 2,180,455 2,246,513
Commercial Portfolio Segment [Member]    
Financial Information [Line Items]    
Loans and leases receivable gross carrying value 3,874,214 3,940,514
Finance Leases [Member]    
Financial Information [Line Items]    
Loans and leases receivable gross carrying value 233,335 229,165
Other Consumer Loans [Member]    
Financial Information [Line Items]    
Loans and leases receivable gross carrying value 1,483,293 1,597,984
Construction Loans [Member]    
Financial Information [Line Items]    
Loans and leases receivable gross carrying value $ 124,951 $ 156,195
[1]
As of December 31, 2016 and 2015, includes $853.9 million and $973.2 million, respectively, of commercial loans that are secured by real estate but are not dependent upon the real estate for repayment.