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Covered Loans Thirty to Eighty Nine Days, Ninety Days or More Past Due (Detail) - Covered Loans - Covered loans held for sale
$ in Thousands
Dec. 31, 2016
USD ($)
Loans 90 Days Or More Past Due  
Financing Receivable, Recorded Investment, Past Due [Line Items]  
Total Past Due $ 131,465
Loans 90 Days Or More Past Due | One-to-four family  
Financing Receivable, Recorded Investment, Past Due [Line Items]  
Total Past Due 124,820
Loans 90 Days Or More Past Due | Other loans  
Financing Receivable, Recorded Investment, Past Due [Line Items]  
Total Past Due 6,645
Financing Receivable, 30-89 Days Past Due  
Financing Receivable, Recorded Investment, Past Due [Line Items]  
Total Past Due 22,648
Financing Receivable, 30-89 Days Past Due | One-to-four family  
Financing Receivable, Recorded Investment, Past Due [Line Items]  
Total Past Due 21,112
Financing Receivable, 30-89 Days Past Due | Other loans  
Financing Receivable, Recorded Investment, Past Due [Line Items]  
Total Past Due $ 1,536