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Stock Incentive Plan Summary of Unvested Stock and Stock Units (Details) - USD ($)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Other than Options, Nonvested, Number 32,338 30,169 26,897 24,799
Other than Options, Nonvested, Weighted Average Grant Date Fair Value $ 22.64 $ 20.87 $ 22.95 $ 24.16
RSA/RSU, Grants in Period, Gross 13,912 18,002 19,377  
Other than Options, Grants in Period, Weighted Average Grant Date Fair Value $ 26.09 $ 20.14 $ 22.00  
Other than Options, Vested in Period (11,743) (14,730) (14,499)  
Other than Options, Vested in Period, Weighted Average Grant Date Fair Value $ 22.18 $ 23.77 $ 23.72  
Other than Options, Forfeited in Period 0 0 (2,780)  
Other than Options, Forfeitures, Weighted Average Grant Date Fair Value $ 0.00 $ 0.00 $ 23.12  
Other than Options, Vested in Period, Total Fair Value $ 260,483 $ 350,075 $ 343,910  
Nonvested Awards, Total Compensation Cost Not yet Recognized, Share-based Awards Other than Options $ 344,000 $ 386,000 $ 435,000  
Discounted Cash Flow [Member] | Weighted Average [Member] | Significant Unobservable Inputs (Level 3) | Trust preferred securities        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Loss severity