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Equity Plans Restricted Stock and Deferred Restricted Stock Activity (Details) (USD $)
12 Months Ended
Dec. 31, 2013
Restricted Stock and Deferred Restricted Stock [Member]
 
Restricted and Deferred Restricted Stock Awards Outstanding [Roll Forward]  
Outstanding as of January 1, 2012, units 229,022
Issued, units 38,370
Exercised, units (38,480)
Forfeited or expired (8,548)
Outstanding as of December 31, 2012, units 220,364
Shares vested as of December 31, 2012, shares 142,978
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Weighted Average Grant Date Fair Value [Roll Forward] [Roll Forward]  
Outstanding as of January 1, 2012, wtd avg grant date fair value $ 16.65
Issued, wtd avg grant date fair value $ 25.60
Exercised, wtd avg grant date fair value $ 23.64
Forfeited or expired, wtd avg grant date fair value $ 23.47
Outstanding as od December 31, 2012, wtd avg grant date fair value $ 17.67
Shares vested as of December 31, 2012, wtd avg grant date fair value $ 18.30
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]  
Nonvested as of January 1, 2012, units 76,213
Granted, units 38,370
Vested, units (28,649)
Forfeited, units (8,548)
Nonvested as of December 31, 2012, units 77,386
Restricted and Deferred Restricted Stock Awards, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]  
Nonvested as of January 1, 2012, wtd avg grant date fair value $ 15.45
Granted, wtd avg grant date fair value $ 25.60
Vested, wtd avg grant date fair value $ 23.82
Forfeited, wtd avg grant date fair value $ 23.47
Nonvested as of December 31, 2012, wtd avg grant date fair value $ 16.49
Unrecognized compensation cost $ 618,000
Period for recognition of compensation cost 1 year 2 months 19 days
Formulaic Equity Award Program [Member] | Restricted Stock [Member]
 
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Fair market value division amount $ 35