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Equity Incentive Plan (Narrative) (Details) (USD $)
 12 Months Ended 0 Months Ended 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2013
Stock Options [Member]
Dec. 31, 2013
Restricted Stock [Member]
Jul. 26, 2013
2008 Equity Incentive Plan [Member]
Jan. 30, 2010
2008 Equity Incentive Plan [Member]
May 29, 2009
2008 Equity Incentive Plan [Member]
Jan. 30, 2009
2008 Equity Incentive Plan [Member]
Dec. 31, 2013
2008 Equity Incentive Plan [Member]
Dec. 31, 2013
2008 Equity Incentive Plan [Member]
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Shares authorized under equity incentive plan                   4,311,796  
Shares available for issuance under equity incentive plan                   211,530  
Vesting period                   5 years  
Expiration period                     10 years
Method used to estimate fair value           Black-Scholes option pricing model Black-Scholes option pricing model Black-Scholes option pricing model Black-Scholes option pricing model    
Expected life           6 years 6 months 6 years 6 months 6 years 6 months 6 years 6 months    
Risk free return           1.39% 2.90% 2.88% 2.17%    
Volatility           35.33% 38.29% 38.39% 35.33%    
Dividend rate           1.98% 1.81% 1.50% 1.61%    
Allocated stock-based compensation expense $ 3,200,000 $ 3,000,000 $ 3,000,000                
Expected future stock-based compensation expense       $ 170,000 $ 294,000            
Average period of expected future stock option expense       1 year 8 months 12 days 2 years 4 months 24 days