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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, 2019
Dec. 31, 2018
Jun. 30, 2018
Financing Receivable, Impaired [Line Items]      
Impaired loans with an allowance for loan loss required $ 60,122 $ 60,219 $ 39,956
Impaired loans with no allowance for loan loss required 77,165 67,050 80,346
Total impaired loans 137,287 127,269 120,302
Allowance for loan losses related to impaired loans 15,200 11,437 8,541
Financing Receivable      
Financing Receivable, Impaired [Line Items]      
Allowance for loan losses related to impaired loans 3,800    
TDRs $ 76,001 $ 66,102 $ 65,310