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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, 2012
Security
Dec. 31, 2011
Dec. 31, 2010
Summary of Significant Accounting Policies (Textual) [Abstract]      
Shares of common stock $ 17.34    
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%    
Financial market performance corridor assumption with basis point 2.00%    
Deferred policy acquisition costs deemed unrecoverable $ 0 $ 0 $ 0
Additional DAC amortization 137 115 115
Goodwill impairment charges 0    
Accumulated amortization of intangible assets 185,276 185,276  
Compensation cost for share-based compensation plans based on the fair value 2,476 1,451 2,163
Number of options not included in diluted earnings per share computation 221,771    
Value of acquired insurance in force 0    
Weighted average fair value of nonvested options outstanding $ 5.60    
Security containing an embedded credit derivative feature 1    
Accumulated other comprehensive income, cumulative effect of adoption of fair value option to account, net 1,338    
Retained earnings, cumulative effect of adoption of fair value option to account, net 1,338    
Realized investment gain, effect of adoption of fair value option to account, pretax 1,088    
Nonvested [Member]
     
Summary of Significant Accounting Policies (Textual) [Abstract]      
Nonvested options outstanding $ 2,266    
Interest Sensitive Life Contracts [Member]
     
Summary of Significant Accounting Policies (Textual) [Abstract]      
Capitalized acquisition costs amortization period for interest-sensitive life contracts 20 years    
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 $ 20.23    
Option expiration date 2019    
Minimum [Member]
     
Summary of Significant Accounting Policies (Textual) [Abstract]      
Reserve investment yield assumptions on certain life insurance policies 4.00%    
Shares of common stock $ 17.71    
Option expiration date 2013    
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