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Covered Loans Thirty to Eighty Nine Days, Ninety Days or More Past Due (Detail) - Covered Loans - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Loans 90 Days Or More Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due $ 138,735 $ 137,182
Loans 90 Days Or More Past Due | One-to-four family    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 131,876 130,626
Loans 90 Days Or More Past Due | Other loans    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 6,859 6,556
Financing Receivable, 30-89 Days Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 28,007 32,824
Financing Receivable, 30-89 Days Past Due | One-to-four family    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 26,849 30,455
Financing Receivable, 30-89 Days Past Due | Other loans    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due $ 1,158 $ 2,369