Other Real Estate Owned and Other Repossessed Assets - Real Estate Owned and Other Repossessed Assets (Detail) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015	Mar. 31, 2015	Dec. 31, 2014
Other Real Estate And Foreclosed Assets [Abstract]
Real estate owned and other repossessed assets	$ 2,970	$ 3,956
Valuation allowance	(1,124)	(1,229)	$ (1,244)	$ (1,423)
End of period	$ 1,846	$ 2,727