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Securities Sold Under Agreements To Repurchase - Securities Sold Under Agreements to Repurchase (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Debt Disclosure [Abstract]
Outstanding balance at year-end	$ 69,305,000	$ 64,765,000
Weighted average interest rate at year-end	0.12%	0.13%
Average daily balance during the year	65,939,000	61,930,000
Weighted average interest rate during the year	0.12%	0.25%
Maximum daily balance during the year	$ 78,960,000	$ 81,980,000

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The average effective interest rate during the reporting period.

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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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For the form of debt having an initial term of less than one year or less than the normal operating cycle, if longer, average borrowings during the period.

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For the form of debt having an initial term of less than one year or less than the normal operating cycle, if longer, the maximum amount borrowed at any time during the period.

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Weighted average interest rate of short-term debt outstanding.

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