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Derivative Financial Instruments Offsetting of Derivative Assets (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Offsetting Assets [Line Items]    
Gross Amounts of Recognized Assets $ 185 $ 146
Gross Amounts Offset in the Consolidated Balance Sheets 0 0
Net Amounts of Assets Presented in the Consolidated Balance Sheets 185 146
Derivative Financial Instruments Not Offset in Consolidated Balance Sheets (156) (135)
Cash Collateral Received Not Offset in Consolidated Balance Sheets 0 0
Net Amount $ 29 $ 11