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Short-Term Borrowings - Additional Information (Detail) - USD ($)	9 Months Ended
	Sep. 30, 2015	Dec. 31, 2014
Short-term Debt [Line Items]
Federal funds purchased	$ 0	$ 0
Securities sold under repurchase agreements	1,200,000	400,000
Available fund lines from correspondent banks	$ 18,800,000	$ 18,800,000
Minimum [Member]
Short-term Debt [Line Items]
Maturity period of federal funds	1 day
Maximum [Member]
Short-term Debt [Line Items]
Maturity period of federal funds	4 days

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

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