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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 - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Loans 90 Days Or More Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due $ 129,093 $ 131,465
Loans 90 Days Or More Past Due | One-to-four family    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 120,815 124,820
Loans 90 Days Or More Past Due | Other loans    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 8,278 6,645
Financing Receivable, 30-89 Days Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 22,852 22,648
Financing Receivable, 30-89 Days Past Due | One-to-four family    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 17,718 21,112
Financing Receivable, 30-89 Days Past Due | Other loans    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due $ 5,134 $ 1,536