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Covered Loans Acquired in AmTrust and Desert Hills Acquisitions (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Covered loans $ 2,060,089 $ 2,428,622
Percent of Covered Loans 100.00%  
One-to-four family    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Covered loans $ 1,916,509  
Percent of Covered Loans 93.00%  
Other loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Covered loans $ 143,580  
Percent of Covered Loans 7.00%