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Covered Loans Acquired in Acquisitions of AmTrust Bank ("Am Trust") and Desert Hills Bank ("Desert Hills") (Detail) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]
Covered loans	$ 1,599,101	$ 1,698,133
Percent of Covered Loans	100.00%
One-to-four family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Covered loans	$ 1,531,872
Percent of Covered Loans	95.80%
Other loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Covered loans	$ 67,229
Percent of Covered Loans	4.20%