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Covered Loans Acquired in AmTrust and Desert Hills Acquisitions (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]
Covered loans	$ 1,698,133	$ 2,060,089
Percent of Covered Loans	100.00%
One-to-four family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Covered loans	$ 1,609,635
Percent of Covered Loans	94.80%
Other loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Covered loans	$ 88,498
Percent of Covered Loans	5.20%