Covered Loans - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Jun. 30, 2015
Receivables [Abstract]
Cash received from the FDIC as final payment		$ 8,700
Pre-tax gain	$ 200
Covered loans			$ 95,400	$ 107,587	$ 135,407
Percentage of prospective yield adjustments offset	80.00%	80.00%