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Summary of Significant Accounting Policies (Details Textual) (USD $) In Thousands, except Share data, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Summary of Significant Accounting Policies (Textual) [Abstract] |  |  |
Shares of common stock | $ 20.97 |  |
Summary of Significant Accounting Policies (Additional Textual) [Abstract] |  |  |
Acquisition costs amortization in years for individual life contracts term one | 10 years |  |
Acquisition costs amortization in years for individual life contracts term two | 15 years |  |
Acquisition costs amortization in years for individual life contracts term three | 20 years |  |
Acquisition costs amortization in years for individual life contracts term four | 30 years |  |
Property and Casualty policy, acquisition cost amortized term one | 6 months |  |
Property and Casualty policy, acquisition cost amortized term two | 12 months |  |
Financial market performance assumption | 10.00% |  |
Deferred policy acquisition costs deemed unrecoverable | $ 0 | $ 0 | $ 0
Goodwill impairment charges | 0 |  |
Compensation cost for share-based compensation plans based on the fair value | 1,419 | 2,476 | 1,451
Number of options not included in diluted earnings per share computation | 243,727 |  |
Weighted average fair value of nonvested options outstanding | $ 19.41 | $ 15.93 |
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Gain (Loss), before Tax | 22,245 |  |
Federal Home Loan Bank Advances Branch Of FHLB Bank Borrowings Description | Any borrowing from the FHLB requires the purchase of FHLB activity-based common stock in an amount equal to 5.0% of the borrowing, or a lower percentage -- such as 2.0% based on the Reduced Capitalization Advance Program. |  |
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Amount of Advances | 250,000 |  |
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Interest Rate | 0.24% |  |
Financial market performance corridor assumption with basis point | 200 |  |
Deferred Policy Acquisition Costs | 245,355 | 196,885 |
Other Tax Expense (Benefit) | 7,786 |  |
Maturing On December 28, 2015 [Member] |  |  |
Summary of Significant Accounting Policies (Additional Textual) [Abstract] |  |  |
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Amount of Advances | 125,000 |  |
Maturing On December 15, 2023 [Member] |  |  |
Summary of Significant Accounting Policies (Additional Textual) [Abstract] |  |  |
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Amount of Advances | 125,000 |  |
Nonvested [Member] |  |  |
Summary of Significant Accounting Policies (Textual) [Abstract] |  |  |
Nonvested options outstanding | 2,448 |  |
Summary of Significant Accounting Policies (Additional Textual) [Abstract] |  |  |
Weighted average fair value of nonvested options outstanding | $ 6.88 |  |
Interest Sensitive Life Contracts [Member] |  |  |
Summary of Significant Accounting Policies (Textual) [Abstract] |  |  |
Capitalized acquisition costs amortization period for interest-sensitive life contracts | 20 years |  |
Summary of Significant Accounting Policies (Additional Textual) [Abstract] |  |  |
Deferred Policy Acquisition Costs | $ 24,997 | $ 58,808 |
Investment Contracts [Member] |  |  |
Summary of Significant Accounting Policies (Textual) [Abstract] |  |  |
Acquisition costs, amortization period | 20 years |  |
Maximum [Member] |  |  |
Summary of Significant Accounting Policies (Textual) [Abstract] |  |  |
Reserve investment yield assumptions on certain life insurance policies | 8.00% |  |
Shares of common stock | $ 30.24 |  |
Option expiration date | 2017 |  |
Summary of Significant Accounting Policies (Additional Textual) [Abstract] |  |  |
Guarantee Of Premium Annual Rate Percentage | 5.00% |  |
Minimum [Member] |  |  |
Summary of Significant Accounting Policies (Textual) [Abstract] |  |  |
Reserve investment yield assumptions on certain life insurance policies | 4.00% |  |
Shares of common stock | $ 20.60 |  |
Option expiration date | 2014 |  |
Summary of Significant Accounting Policies (Additional Textual) [Abstract] |  |  |
Guarantee Of Premium Annual Rate Percentage | 3.00% |  |
Leasehold improvements and other property and equipment [Member] | Maximum [Member] |  |  |
Summary of Significant Accounting Policies (Textual) [Abstract] |  |  |
Estimated useful lives of property and equipment | 10 years |  |
Leasehold improvements and other property and equipment [Member] | Minimum [Member] |  |  |
Summary of Significant Accounting Policies (Textual) [Abstract] |  |  |
Estimated useful lives of property and equipment | 2 years |  |
Real Estate Property [Member] | Maximum [Member] |  |  |
Summary of Significant Accounting Policies (Textual) [Abstract] |  |  |
Estimated useful lives of property and equipment | 45 years |  |
Real Estate Property [Member] | Minimum [Member] |  |  |
Summary of Significant Accounting Policies (Textual) [Abstract] |  |  |
Estimated useful lives of property and equipment | 20 years |  |

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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