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Investment Securities (Narrative) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended |
--- | --- | ---
Mar. 31, 2013 | Mar. 31, 2012 | Dec. 31, 2012
Investment [Line Items] |  |  |
Gain (Loss) on Sale of Securities, Gross | $ 71 |  |
Investment Securities: |  |  |
Consolidated investment securities portfolio modified, years | 2 years 1 month 24 days |  |
Proceeds from sales of investment securities - available for sale | 1,218 |  |
Book value of securities available for sale and held to maturity | $ 89,123 |  | $ 94,206
Positions considered temporarily impaired | 18 |  |
Standard & Poor's, AAA Rating [Member] |  |  |
Investment [Line Items] |  |  |
Portfolio rated | 91.10% |  | 92.20%
Standard & Poor's, A Rating [Member] |  |  |
Investment [Line Items] |  |  |
Portfolio rated | 1.30% |  |

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- Definition The net gain (loss) realized from the sale, exchange, redemption, or retirement of securities, not separately or otherwise categorized as trading, available-for-sale, or held-to-maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 3 -Article 7 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.13(h)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.3) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 13 -Subparagraph h -Article 9 + Details
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