Fair Value (Additional Information) (Detail) - USD ($)	Jun. 30, 2015	Dec. 31, 2014
Fair Value Disclosures [Abstract]
Impaired loans	$ 28,694,000	$ 29,419,000
Impaired loans fair value	25,800,000	26,500,000
Specific loan loss reserves	$ 2,900,000	$ 2,900,000