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LOAN PORTFOLIO - Loan Portfolio Held for Investment (Detail) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Mar. 31, 2015
Financial Information [Line Items]      
Residential mortgage loans, mainly secured by first mortgages $ 3,330,945 $ 3,344,719  
Commercial loans:      
Construction loans 146,129 156,195  
Commercial mortgage loans 1,524,491 1,537,806  
Commercial and Industrial loans [1] 2,343,416 2,407,996  
Loans to local financial institutions collateralized by real estate mortgages 0 0  
Commercial loans 4,014,036 4,101,997  
Finance leases 230,801 229,165  
Consumer loans 1,555,560 1,597,984  
Loans held for investment 9,131,342 9,273,865 $ 9,485,372
Less: allowance for loan and lease losses (238,125) (240,710)  
Loans held for investment, net 8,893,217 9,033,155  
Commercial And Industrial [Member]      
Commercial loans:      
Loans held for investment $ 2,343,416 $ 2,407,996  
[1] As of March 31, 2016 and December 31, 2015, includes $1.0 billion of commercial loans that are secured by real estate but are not dependent upon the real estate for repayment.