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Allowance for Loan Losses, Allowance for Losses on Lending-Related Commitments and Impaired Loans (Summary of Impaired Loans, Including Restructured Loans) (Detail) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Jun. 30, 2016
Financing Receivable, Impaired [Line Items]      
Impaired loans with an allowance for loan loss required $ 29,037 $ 33,146 $ 42,968
Impaired loans with no allowance for loan loss required 50,281 57,370 53,008
Total impaired loans 79,318 90,516 95,976
Allowance for loan losses related to impaired loans 5,633 6,377 6,611
Financing Receivable      
Financing Receivable, Impaired [Line Items]      
Allowance for loan losses related to impaired loans 953    
TDRs $ 33,091 $ 41,708 $ 49,635