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Covered Loans Thirty to Eighty Nine Days, Ninety Days or More Past Due (Detail) - Covered Loans - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Loans 90 Days Or More Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due $ 137,182 $ 157,889
Loans 90 Days Or More Past Due | One-to-four family    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 130,626 148,967
Loans 90 Days Or More Past Due | Other loans    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 6,556 8,922
Financing Receivable, 30-89 Days Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 32,824 41,696
Financing Receivable, 30-89 Days Past Due | One-to-four family    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 30,455 37,680
Financing Receivable, 30-89 Days Past Due | Other loans    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due $ 2,369 $ 4,016