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Investments (Schedule of Revenue Bonds by Type) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
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

X

- 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

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X

- 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

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