Financial Instruments With Off-Balance-Sheet Risk - Additional Information (Detail) (USD $)					12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013 Standby Letters of Credit [Member]	Dec. 31, 2012 Standby Letters of Credit [Member]	Dec. 31, 2013 Minimum [Member] Standby Letters of Credit [Member]	Dec. 31, 2013 Maximum [Member] Standby Letters of Credit [Member]
Financial Instruments [Line Items]
Line of credit facility, amount outstanding	$ 375,200,000	$ 348,600,000
Line of credit facility outstanding			106,500,000	92,200,000
Line of credit, expiration year					2014	2040
Net unamortized fees			200,000	54,000
Net unamortized cost			$ 300,000	$ 400,000