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Intangible Assets (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
--- | --- | --- | --- | ---
Summary of amortizable intangible assets |  |  |  |
Net Amount | $ 135 | $ 543 |  |
Core deposit [Member] |  |  |  |
Summary of amortizable intangible assets |  |  |  |
Gross Carrying Amount | 4,795 | 4,795 |  |
Accumulated Amortization | (4,660) | (4,252) |  |
Net Amount | $ 135 | $ 543 | $ 978 | $ 1,504

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