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Intangible Assets (Details) (Core Deposit Intangible Asset, USD $) In Thousands, unless otherwise specified | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2011
--- | --- | --- | --- | --- | --- | ---
Core Deposit Intangible Asset |  |  |  |  |  |
Intangible assets |  |  |  |  |  |
Gross Carrying Amount | $ 4,795 |  | $ 4,795 |  |  |
Accumulated Amortization | (4,795) |  | (4,660) |  |  |
Net Amount | $ 0 | $ 34 | $ 135 | $ 337 | $ 439 | $ 543

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