Covered Loans Thirty to Eighty Nine Days, Ninety Days or More Past Due (Detail) (Covered Loans, USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans 90 days or more past due	$ 267,821	$ 312,573
Loans 30-89 Days Past Due	65,391	81,186
One-to-four family
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans 90 days or more past due	255,260	297,265
Loans 30-89 Days Past Due	61,213	75,129
Other loan
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans 90 days or more past due	12,561	15,308
Loans 30-89 Days Past Due	$ 4,178	$ 6,057