Securities - Additional Information (Detail) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2014 Bond	Jun. 30, 2013	Jun. 30, 2014 Bond	Jun. 30, 2013	Dec. 31, 2013 Bond
Schedule of Available-for-sale Securities [Line Items]
Average yields on securities	2.36%	2.27%	2.37%	2.22%
Market value of securities	$ 13,300,000		$ 13,300,000		$ 12,900,000
Municipal bonds with unrealized loss position	41		41		50
Federal agencies bonds with unrealized loss position	15		15		15
Company's investment in Federal Home Loan Bank stock	1,421,400		1,421,400		1,079,800
Company's investment in Federal Reserve Bank stock	$ 382,000		$ 382,000		$ 382,000