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Loans (Details 4) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Impaired financing receivables with related and not related allowances |  |  |
Allowance average recorded Investment |  |  | $ 12,106
Allowance recorded Interest Income recognized |  |  | 383
Allowance recorded cash basis interest recognized |  |  | 383
Total average recorded investment | 24,964 | 18,392 |
Total cash basis interest recognized | 20 | 26 |
Total Interest Income Recognized | 20 | 26 |
Commercial, industrial, and agricultural [Member] |  |  |
Impaired financing receivables with related and not related allowances |  |  |
Allowance average recorded Investment | 3,083 | 3,711 |
Allowance recorded Interest Income recognized | 4 | 3 |
Allowance recorded cash basis interest recognized | 4 | 3 |
No allowance average recorded investment | 3,217 | 2,050 |
No allowance recorded interest income recognized |  |  |
No allowance recorded cash basis interest recognized |  |  |
Commercial mortgages [Member] |  |  |
Impaired financing receivables with related and not related allowances |  |  |
Allowance average recorded Investment | 5,504 | 6,412 |
Allowance recorded Interest Income recognized | 3 | 19 |
Allowance recorded cash basis interest recognized | 3 | 19 |
No allowance average recorded investment | 12,723 | 6,040 |
No allowance recorded interest income recognized |  |  |
No allowance recorded cash basis interest recognized |  |  |
Residential real estate [Member] |  |  |
Impaired financing receivables with related and not related allowances |  |  |
Allowance average recorded Investment | 334 | 179 |
Allowance recorded Interest Income recognized | 13 | 4 |
Allowance recorded cash basis interest recognized | 13 | 4 |
No allowance average recorded investment | 103 |  |
No allowance recorded interest income recognized |  |  |
No allowance recorded cash basis interest recognized |  |  |

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