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Transactions with Related Parties - Schedule of Activities in Related Party Loans (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Related Party Transaction [Line Items]
Balance, beginning of year	$ 994	$ 993	$ 1,088
Additions or renewals	49	204	828
Amounts collected	(910)	(203)	(923)
Balance, end of year	$ 133	$ 994	$ 993

Reflects the amount of new advances made to related parties in the form of loan and lease receivables.

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- Definition

Reflects the amount of collections received from related parties to reduce the carrying amounts of loans and leases receivable due from them.

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- Definition

Receivables to be collected from (obligations owed to) related parties, net as of the balance sheet date where one party can exercise control or significant influence over another party; including affiliates, owners or officers and their immediate families, pension trusts, and so forth.

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