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Share-Based Compensation (Details 2) (USD $)
12 Months Ended
Dec. 31, 2012
Summary of the status of Horizons non-vested, restricted shares  
Non-vested beginning of year, shares 29,250
Non-vested beginning of year, weighted average grant date fair value $ 12.88
Vested   
Vested, Weighted Average Grant Date Fair Value   
Granted 46,753
Granted, Weighted Average Grant Date Fair Value $ 13.70
Forfeited   
Forfeited, Weighted Average Grant Date Fair Value   
Non-vested, end of year, shares 76,003
Non-vested end of year, weighted average grant date fair value $ 13.38