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Quality of Non-Covered Loans (Excluding PCI Loans) (Parenthetical) (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Non-Covered Loans    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due $ 91,471 $ 66,852
Non-Covered Loans | Commercial and Industrial    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due [2] 50,479 [1] 23,685 [3]
Financing Receivable, 30-89 Days Past Due | Non-Covered Loans    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due [2] 17,789 10,383
Financing Receivable, 30-89 Days Past Due | Non-Covered Loans | Purchased Credit-Impaired Loans    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due   6
Financing Receivable, 30-89 Days Past Due | Non-Covered Loans | Commercial and Industrial    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due [2] 2,711 [1] 7,263 [3]
Financing Receivable, 30-89 Days Past Due | Taxi Medallion Loans | Commercial and Industrial    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 2,700 6,800
Loans 90 Days Or More Past Due | Non-Covered Loans | Purchased Credit-Impaired Loans    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due   869
Loans 90 Days Or More Past Due | Taxi Medallion Loans | Commercial and Industrial    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due $ 46,700 $ 15,200
[1] (1) Includes $2.7 million and $46.7 million of taxi medallion-related loans that were 30 to 89 days past due and 90 days or more past due, respectively.
[2] (2) Includes lease financing receivables, all of which were current.
[3] (1) Excludes $6 thousand and $869 thousand of non-covered PCI loans that were 30 to 89 days past due and 90 days or more past due, resp