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Investments (Schedule of Revenue Bonds by Type) (Details) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2014 | Dec. 31, 2013
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Investment Holdings, Other than Securities [Line Items] |  |
Amortized Cost | $ 461,990 | $ 424,315
Estimated Fair Value | 467,688 | 425,044
States and political subdivisions [Member] |  |
Investment Holdings, Other than Securities [Line Items] |  |
Amortized Cost | 96,199 | 97,361
Estimated Fair Value | 98,623 | 96,563
Revenue Bonds [Member] | States and political subdivisions [Member] |  |
Investment Holdings, Other than Securities [Line Items] |  |
Amortized Cost | 19,581 | 18,233
Estimated Fair Value | 19,895 | 17,931
Revenue Bonds [Member] | Water [Member] | States and political subdivisions [Member] |  |
Investment Holdings, Other than Securities [Line Items] |  |
Amortized Cost | 8,010 | 7,409
Estimated Fair Value | 8,010 | 7,144
Revenue Bonds [Member] | College And University [Member] | States and political subdivisions [Member] |  |
Investment Holdings, Other than Securities [Line Items] |  |
Amortized Cost | 2,731 | 2,203
Estimated Fair Value | 2,840 | 2,187
Revenue Bonds [Member] | Electric And Power [Member] | States and political subdivisions [Member] |  |
Investment Holdings, Other than Securities [Line Items] |  |
Amortized Cost | 1,882 | 1,888
Estimated Fair Value | 1,921 | 1,895
Revenue Bonds [Member] | Sales Tax [Member] | States and political subdivisions [Member] |  |
Investment Holdings, Other than Securities [Line Items] |  |
Amortized Cost | 1,672 | 1,673
Estimated Fair Value | 1,715 | 1,688
Revenue Bonds [Member] | Lease [Member] | States and political subdivisions [Member] |  |
Investment Holdings, Other than Securities [Line Items] |  |
Amortized Cost | 1,356 | 1,155
Estimated Fair Value | 1,344 | 1,063
Revenue Bonds [Member] | Other Sources [Member] | States and political subdivisions [Member] |  |
Investment Holdings, Other than Securities [Line Items] |  |
Amortized Cost | 3,930 | 3,905
Estimated Fair Value | $ 4,065 | $ 3,954

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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 + Details
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- Definition This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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