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Derivative Instruments and Hedging Activities - Notional amounts and fair values of derivatives designated as hedging instruments (Detail) (Designated as Hedging Instrument [Member], USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Derivative Notional Amount And Fair Value By Balance Sheet Designated As Hedging Instrument [Line Items]
Notional Amount		$ 20,000
Derivative Assets, Fair Value
Derivative Liabilities, Fair Value		1,909
Interest rate swap [Member] \| Cash flow hedge [Member]
Derivative Notional Amount And Fair Value By Balance Sheet Designated As Hedging Instrument [Line Items]
Notional Amount		20,000
Derivative Assets, Fair Value
Interest rate swap [Member] \| Cash flow hedge [Member] \| Other Liabilities [Member]
Derivative Notional Amount And Fair Value By Balance Sheet Designated As Hedging Instrument [Line Items]
Derivative Liabilities, Fair Value		$ 1,909

Fair value of financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, elected not to be offset against an obligation to return collateral under a master netting arrangement.

+ References+ Details

- Definition

Fair value of financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, elected not to be offset against a right to receive collateral under a master netting arrangement.

+ References+ Details