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Quality of Non-Covered Loans (Excluding PCI Loans) (Parenthetical) (Detail) - Non-Covered Loans - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due $ 66,852 $ 53,430
Financing Receivable, 30-89 Days Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 10,383 [1] 6,605
Financing Receivable, 30-89 Days Past Due | Purchased Credit-Impaired Loans    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 6,000  
Loans 90 Days Or More Past Due | Purchased Credit-Impaired Loans    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due $ 869,000 $ 969,000
[1] Excludes $6,000 and $869,000 of non-covered PCI loans that were 30 to 89 days past due and 90 days or more past due, respectively.