Regulatory Matters and Shareholders' Equity - Additional Information (Detail) - USD ($)	6 Months Ended	12 Months Ended
	Jun. 30, 2016	Dec. 31, 2015	Dec. 31, 2014
Banking and Thrift [Abstract]
Undistributed earnings of the Bank	$ 1,256,000
Small bank holding company asset threshold limit		$ 1,000,000,000	$ 500,000,000