Accrued Interest Receivable and Other Assets - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Interest Receivable And Other Assets [Abstract]
Federal Reserve Bank stock	$ 3,300,000	$ 3,300,000
FHLB Stock	3,200,000	4,100,000
Other-than-temporary impairment of investment		$ 13,000	$ 16,000