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Investment Securities (Narrative) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2013 | Sep. 30, 2013 | Sep. 30, 2012 | Dec. 31, 2012
Investment [Line Items] |  |  |  |
Gross investment gains | $ 66 | $ 137 | $ 59 |
Gross investment losses |  |  | 47 |
Investment Securities: |  |  |  |
Consolidated investment securities portfolio modified, years |  | 3 years 3 months 18 days |  |
Proceeds from sales of investment securities - available for sale | 1,100 | 2,298 | 4,221 |
Book value of securities available for sale and held to maturity | $ 112,085 | $ 112,085 |  | $ 94,206
Positions considered temporarily impaired | 54 | 54 |  |
Standard & Poor's, AAA Rating [Member] |  |  |  |
Investment [Line Items] |  |  |  |
Portfolio rated | 89.70% | 89.70% |  | 92.20%
Standard & Poor's, A Rating [Member] |  |  |  |
Investment [Line Items] |  |  |  |
Portfolio rated | 1.20% | 1.20% |  |

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