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Securities Sold Under Repurchase Agreements - Summary of Securities Sold Under Repurchase Agreements (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Securities Financing Transaction [Line Items]
Average daily balance during the year	$ 73,310	$ 83,516
Average interest rate during the year	0.35%	0.54%	0.58%
Weighted average interest rate at year-end	0.31%us-gaap_DebtWeightedAverageInterestRate	0.57%us-gaap_DebtWeightedAverageInterestRate	0.44%us-gaap_DebtWeightedAverageInterestRate
Average Daily Balance [Member]
Securities Financing Transaction [Line Items]
Average daily balance during the year	47,136	26,908	26,563
Maximum [Member]
Securities Financing Transaction [Line Items]
Average daily balance during the year	$ 73,310	$ 83,516	50,120

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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