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Summary of Significant Accounting Policies (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, before Tax $ 11,667 $ 10,943 $ 22,245
Other Tax Expense (Benefit) 4,083 3,830 7,786
Quantifying Misstatement in Current Year Financial Statements, Amount $ 3,012    
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    
Amortization Period Of Acquisition Costs Related To Property And Casualty Policy Term One 6 months    
Amortization Period Of Acquisition Costs Related To Property And Casualty Policy Term Two 12 months    
Percentage Of Reversion To Mean Approach Utilized To Amortize Policy Acquisition Costs 10.00%    
Federal Home Loan Bank Advances Branch Off hlb 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, Interest Rate 0.30%    
Allocated Share-based Compensation Expense $ 1,285 1,270 1,419
Weighted Average Fair Value Of Nonvested Options Outstanding $ 9.35    
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 166,036    
Earnings Per Share, Potentially Dilutive Securities $28.91 to $33.41    
Federal Home Loan Bank Advances Branch Of FHLB Bank Additional Amount Of Advances By Branch $ 75,000    
Un Allocated Share Based Compensation Expense 6,900    
Quantifying Misstatement In Current Year Financial Statements Amount Pretax $ 4,634    
Acquisition Costs Amortization In Years For Indexed Universal Life Contracts 30 years    
Acquisition Costs Amortization In Years For Annuity Contracts 20 years    
Nonvested [Member]      
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Total $ 2,300    
Restricted Stock Units (RSUs) [Member]      
Allocated Share-based Compensation Expense 892 6,132 $ 6,954
Maturing On December 15, 2023 [Member]      
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Amount of Advances 125,000    
Maturing On September 13, 2019 [Member]      
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Amount of Advances 250,000    
Maturing On January 16, 2026 [Member]      
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Amount of Advances $ 200,000    
Maximum [Member]      
Reserve Investment Yield Assumption Life 8.00%    
Minimum [Member]      
Reserve Investment Yield Assumption Life 3.50%    
Lease hold Improvements And Other Property And Equipment [Member] | Maximum [Member]      
Property, Plant and Equipment, Useful Life 10 years    
Lease hold Improvements And Other Property And Equipment [Member] | Minimum [Member]      
Property, Plant and Equipment, Useful Life 2 years    
Real Estate Property [Member] | Maximum [Member]      
Property, Plant and Equipment, Useful Life 45 years    
Real Estate Property [Member] | Minimum [Member]      
Property, Plant and Equipment, Useful Life 20 years    
Investment Contracts [Member]      
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Amount of Advances $ 575,000    
Interest Sensitive Life Contracts [Member]      
Deferred Policy Acquisition Cost Ending Impact Of Unrealized Investment Gains Losses $ 38,819 $ 67,932  
Amortization Period Of Acquisition Costs Related To Interest Sensitive Life Contracts 20 years    
Property and casualty [Member]      
Quantifying Misstatement in Current Year Financial Statements, Amount $ 2,056    
Annuity [Member]      
Quantifying Misstatement in Current Year Financial Statements, Amount 519    
Life [Member]      
Quantifying Misstatement in Current Year Financial Statements, Amount $ 437