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Covered Loans Acquired in Acquisitions of AmTrust Bank ("Am Trust") and Desert Hills Bank ("Desert Hills") (Detail) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]
Covered loans	$ 1,500,000	$ 1,698,133
Covered loans held for sale
Accounts, Notes, Loans and Financing Receivable [Line Items]
Covered loans	$ 1,480,733
Percent of Covered Loans	100.00%
One-to-four family \| Covered loans held for sale
Accounts, Notes, Loans and Financing Receivable [Line Items]
Covered loans	$ 1,433,324
Percent of Covered Loans	96.80%
Other loans \| Covered loans held for sale
Accounts, Notes, Loans and Financing Receivable [Line Items]
Covered loans	$ 47,409
Percent of Covered Loans	3.20%