Acquisition - Additional Information (Detail) (USD $)	0 Months Ended	12 Months Ended
	May 31, 2013	Dec. 31, 2014	Dec. 31, 2013
Business Acquisition [Line Items]
Payment for all outstanding shares of acquired entity in cash	$ 39,200,000
Payment for all outstanding shares of acquired entity by shares	840,000
Date of acquisition agreement		Feb. 09, 2013
Fair value of purchased credit impaired loans		20,194,000	27,926,000
Contractual amounts		3,275,000	3,970,000
Orange Savings Bank [Member]
Business Acquisition [Line Items]
Payment for all outstanding shares of acquired entity in cash	39,200,000
Fair value of total loans		293,288,000
Total loans of contractual amounts		299,252,000
Fair value of purchased credit impaired loans		4,475,000
Contractual amounts		$ 5,878,000