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