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Investment Holding Level 4 Concentration of Credit Risk (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015
Concentration Risk [Line Items] |  |
Fair Value, Concentration of Risk, Investments | $ 0 | $ 0
Concentration Risk, Benchmark Description | greater than 10% of the Company's stockholders' equity | greater than 10% of the Company's stockholders' equity
CALIFORNIA | US States and Political Subdivisions Debt Securities [Member] |  |
Concentration Risk [Line Items] |  |
Largest Exposure by Issuer, Percent of Invested Assets | 1.00% | 1.00%
CALIFORNIA | US States and Political Subdivisions Debt Securities [Member] |  |
Concentration Risk [Line Items] |  |
Largest Exposure by Issuer, Percent of Invested Assets | 1.00% |
Morgan Stanley [Member] | US States and Political Subdivisions Debt Securities [Member] |  |
Concentration Risk [Line Items] |  |
Largest Exposure by Issuer, Percent of Invested Assets |  | 1.00%
Morgan Stanley [Member] | Corporate Debt Securities [Member] |  |
Concentration Risk [Line Items] |  |
Largest Exposure by Issuer, Percent of Invested Assets | 1.00% |
J.P. Morgan Chase [Member] | Corporate Debt Securities [Member] |  |
Concentration Risk [Line Items] |  |
Largest Exposure by Issuer, Percent of Invested Assets |  | 1.00%
Financial Services [Member] | US States and Political Subdivisions Debt Securities [Member] |  |
Concentration Risk [Line Items] |  |
Largest Exposure by Sector, Percent of Invested Assets | 8.00% |
Financial Services [Member] | Corporate Debt Securities [Member] |  |
Concentration Risk [Line Items] |  |
Largest Exposure by Sector, Percent of Invested Assets |  | 9.00%
Municipal Bonds [Member] | US States and Political Subdivisions Debt Securities [Member] |  |
Concentration Risk [Line Items] |  |
Largest Exposure by Sector, Percent of Invested Assets | 16.00% | 17.00%
Public Utility, Bonds [Member] | Corporate Debt Securities [Member] |  |
Concentration Risk [Line Items] |  |
Largest Exposure by Sector, Percent of Invested Assets | 8.00% |
Commercial Mortgage Backed Securities [Member] | Corporate Debt Securities [Member] |  |
Concentration Risk [Line Items] |  |
Largest Exposure by Sector, Percent of Invested Assets |  | 6.00%

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- Definition Identifies or describes the benchmark that serves as the denominator in the calculation of the percentage of concentration risk. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13537-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=64851502&loc=d3e6351-108592 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=64851502&loc=d3e6404-108592 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13531-108611 + Details
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