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Income Taxes (Details)
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Reconciliation of effective tax rate and statutory federal income tax rate    
Federal statutory income tax rate 35.00% 35.00%
State income taxes, net of federal tax benefit 6.80% 6.30%
Tax-exempt interest on municipal obligations (0.20%) (0.60%)
Increase in cash value of insurance policies (1.00%) (2.50%)
Other 0.10% 0.30%
Effective Tax Rate 40.70% 38.50%