Securities - Additional Information (Detail) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Schedule Of Trading Securities And Other Trading Assets [Line Items]
Held to maturity securities, Carrying Value	$ 4,775,000		$ 4,775,000		$ 0
Securities pledged for public funds	109,500,000		109,500,000		36,200,000
Securities pledged for borrowings	64,300,000		64,300,000		82,200,000
Proceeds from the sale of securities available for sale	0	$ 5,000,000	5,153,000	$ 5,042,000
Gross gains on sales of securities available for sale	0	$ 31,000	11,000	$ 34,000
Ohio Linked Deposit Program [Member]
Schedule Of Trading Securities And Other Trading Assets [Line Items]
Securities pledged for investment in Ohio Linked Deposit Program	$ 0		$ 0		$ 501,000