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Securities Sold Under Repurchase Agreements - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Securities Sold Under Agreements To Repurchase [Abstract]
Securities sold under repurchase , period	1 day
Securities sold under repurchase agreements	$ 13,034,000	$ 10,166,000
Repurchase agreement secured by investment securities, fair value	$ 18,400,000	$ 13,300,000
Repurchase agreement, weighted average interest rate	0.15%	0.15%

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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