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Investment in Securities (Schedule of the Fair Values of Securities with Unrealized Losses) (Details) - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2015 | Dec. 31, 2014
Investment [Line Items] |  |
Estimated fair value, less than 12 months | $ 103,552 | $ 8,700
Estimated fair value, 12 months or more | 1,195 | 13,833
Estimated fair value, total | 104,747 | 22,533
Unrealized losses, 12 months or more | 1,164 | 15
Unrealized losses, less than 12 months | 38 | 183
Unrealized losses, total | 1,202 | 198
State and Political Subdivisions [Member] |  |
Investment [Line Items] |  |
Estimated fair value, less than 12 months | 103,552 | 8,700
Estimated fair value, 12 months or more | 1,195 | 13,833
Estimated fair value, total | 104,747 | 22,533
Unrealized losses, 12 months or more | 1,164 | 15
Unrealized losses, less than 12 months | 38 | 183
Unrealized losses, total | $ 1,202 | $ 198
Certificates Of deposit [Member] |  |
Investment [Line Items] |  |
Estimated fair value, less than 12 months |  |
Estimated fair value, 12 months or more |  |
Estimated fair value, total |  |
Unrealized losses, 12 months or more |  |
Unrealized losses, less than 12 months |  |
Unrealized losses, total |  |

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- Definition Amount of unrealized loss on securities classified as available-for-sale that have been in a loss position for twelve months or longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 + Details
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- Definition Amount of unrealized loss on securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 + Details
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