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Investment Securities (Narrative) (Details) - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014 | Dec. 31, 2014
Investment [Line Items] |  |  |  |  |
Gross investment gains | $ 28,000 | $ 120,000 | $ 28,000 | $ 182,000 |
Gross investment losses |  |  |  | 5,000 |
Investment Securities: |  |  |  |  |
Consolidated investment securities portfolio modified, years |  |  | 2 years 9 months 18 days |  |
Proceeds from sales of investment securities - available for sale | 519,000 | $ 2,500,000 | $ 519,000 | $ 5,242,000 |
Book value of securities available for sale and held to maturity | $ 98,457,000 |  | $ 98,457,000 |  | $ 104,780,000
Positions considered temporarily impaired | 51 |  | 51 |  |
Standard & Poor's, AAA Rating [Member] |  |  |  |  |
Investment [Line Items] |  |  |  |  |
Portfolio rated | 81.90% |  | 81.90% |  | 84.10%
Standard & Poor's, A Rating [Member] |  |  |  |  |
Investment [Line Items] |  |  |  |  |
Portfolio rated | 3.90% |  | 3.90% |  |

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