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Investment in Securities (Schedule of the Fair Values of Securities with Unrealized Losses) (Details) (USD $) In Thousands, unless otherwise specified | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2013 | Dec. 31, 2012
Investment [Line Items] |  |
Estimated fair value, less than 12 months | $ 68,468 | $ 19,758
Estimated fair value, 12 months or more |  |
Estimated fair value, total | 68,468 | 19,758
Unrealized losses, 12 months or more |  |
Unrealized losses, less than 12 months | 2,304 | 112
Unrealized losses, total | 2,304 | 112
State and Political Subdivisions [Member] |  |
Investment [Line Items] |  |
Estimated fair value, less than 12 months | 68,468 | 19,758
Estimated fair value, 12 months or more |  |
Estimated fair value, total | 68,468 | 19,758
Unrealized losses, 12 months or more |  |
Unrealized losses, less than 12 months | 2,304 | 112
Unrealized losses, total | 2,304 | 112
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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- Definition This item represents the aggregate fair value of investments in debt and equity securities in an unrealized loss position which are categorized neither as held-to-maturity nor trading securities. + 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)(1) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 + Details
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- Definition Amount of unrealized loss on investments in available-for-sale securities that have been in a loss position for less than twelve months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27337-111563 Reference 2: 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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