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Securities Sold Under Agreements to Repurchase - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Banking And Thrift [Abstract]
Sold security maturity period	1 day
Securities sold under agreements to repurchase averaged	$ 0	$ 13,095,000
Maximum amount outstanding at any month end	$ 15,600,000	$ 16,300,000

Amount, after the effects of master netting arrangements, of funds outstanding borrowed in the form of a security resale agreement between the entity and another party for the purchase and resale of identical or substantially the same securities at a date certain for a specified price. Includes liabilities not subject to a master netting arrangement.

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