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LOAN PORTFOLIO - Loan Portfolio Held for Investment (Detail) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Mar. 31, 2017
Financial Information [Line Items]      
Loans held for investment $ 8,695,890 [1] $ 8,850,476 $ 8,822,349
Less: allowance for loan and lease losses (225,856) (231,843)  
Loans held for investment, net 8,470,034 8,618,633  
Construction Loans [Member]      
Financial Information [Line Items]      
Loans held for investment 79,150 [2] 111,397  
Residential Mortgage [Member]      
Financial Information [Line Items]      
Loans held for investment 3,267,868 3,290,957  
Commercial Real Estate Portfolio Segment [Member]      
Financial Information [Line Items]      
Loans held for investment 1,552,503 [2] 1,614,972  
Commercial Portfolio Segment [Member]      
Financial Information [Line Items]      
Loans held for investment 3,693,426 3,809,622  
Commercial And Industrial Sector [Member]      
Financial Information [Line Items]      
Loans held for investment 2,061,773 [1] 2,083,253  
Other Consumer Loans [Member]      
Financial Information [Line Items]      
Loans held for investment 1,471,733 1,492,435  
Finance Leases [Member]      
Financial Information [Line Items]      
Loans held for investment $ 262,863 $ 257,462  
[1]
As of March 31, 2018 and December 31, 2017, includes $823.2 million and $833.5 million, respectively, of commercial loans that are secured by real estate but are not dependent upon the real estate for repayment.
[2]
During the first quarter of 2018, the Corporation transferred $57.2 million (net of fair value write-downs of $9.7 million) in non-performing loans to held for sale. Loans transferred to held for sale consisted of a $30.0 million non-performing construction loan (net of a $5.1 million fair value write-down) and two non-performing commercial mortgage loans totaling $27.2 million (net of fair value write-downs of $4.6 million).