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Deferred Compensation Plans - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Officer
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Number of years where certain employee will be provided specific amounts of income following normal retirement	Fifteen years
Number of years of service beginning the effective date of the agreement to become fully vested	Four years
Deferred compensation expense	$ 13,000	$ 17,000
Director
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Number of years where certain employee will be provided specific amounts of income following normal retirement	Fifteen years
Deferred compensation expense	$ 18,000	$ 18,000

The compensation expense recognized during the period pertaining to the deferred compensation arrangement.

The maximum term of the deferred compensation arrangement.

The minimum period that the individual is required to perform services in order to be fully vested under the deferred compensation arrangement.