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Benefit Plans (Narrative) (Details) - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2016
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Defined benefit pension plan requisite service period, in years   1 year    
Age of eligibility for noncontributory defined benefit pension plan   21 years    
Highest consecutive years of average-compensation (years)   5 years    
Defined benefit pension plan, years of service   10 years    
Exercise of stock options, shares   14,800 99,086  
Asset allocation, percent   100.00% 100.00%  
Estimated employer contribution to the plan in 2017   $ 211,000    
Benefit Obligation, Remaining Liability   6,695,000 $ 6,583,000 $ 6,783,000
Benefits paid   $ 285,000 $ 281,000  
Restricted shares issued   26,240 26,595  
Unvested stock amortization   $ 940,000 $ 342,000  
Bonds And Cash [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Asset allocation, percent   47.00%    
Equity Securities [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Asset allocation, percent   53.00% 55.10%  
Maximum [Member] | Bonds And Cash [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Target asset, percent   60%    
Maximum [Member] | Equity Securities [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Target asset, percent   50%    
Minimum [Member] | Bonds And Cash [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Target asset, percent   50%    
Minimum [Member] | Equity Securities [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Target asset, percent   40%    
Profit Sharing Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Compensation expense   $ 304,000 $ 262,000  
Percent of eligible participant's W-2 wages   3.00%    
The Replacement Plan [Member] | Chief Executive Officer [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Age of eligibility for noncontributory defined benefit pension plan   65 years    
Projected annual after-tax payments   $ 35,000    
Projected death benefit payments   750,000    
Monthly benefit paid   3,658    
Benefit Obligation, Remaining Liability   739,000 739,000  
Benefits paid   $ 56,000 $ 54,000  
Supplemental Employee Retirement Plan [Member] | Chairman And CEO [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Age of eligibility for noncontributory defined benefit pension plan   70 years    
Supplemental Employee Retirement Plan [Member] | Chairman And CEO [Member] | First Quarter of 2016 [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Benefit Obligation, Remaining Liability   $ 1,300,000    
United States Postretirement Benefit Plan of US Entity [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Defined benefit pension plan requisite service period, in years   40 years    
Age of eligibility for noncontributory defined benefit pension plan   65 years    
Percent of pension for eligible retired employees   1.50%    
Incentive Equity And Deferred Compensation Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Maximum number of shares   243,101    
Shares available for future grants   64,929    
Restrictions on resale of shares   1 year    
Share based compensation cost not yet recognized   $ 1,000,000    
Share based compensation cost not yet recognized, period for recognition   2 years 2 months 27 days    
Incentive Equity And Deferred Compensation Plan [Member] | Maximum [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period   4 years    
Incentive Equity And Deferred Compensation Plan [Member] | Minimum [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period   3 years    
Prior Pension Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Defined benefit pension plan requisite service period, in years   1 year    
Age of eligibility for noncontributory defined benefit pension plan   25 years    
Employee Stock Option [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Increase (decrease) in shares outstanding   5,824    
Maximum number of shares   793,368    
Shares available for future grants   354,090 354,090  
Cash equivalent shares used to pay taxes   8,976    
Share based compensation expenses   $ 0 $ 0  
Employee Stock Option [Member] | Maximum [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Option granted exercise period   10 years    
Restricted Stock [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation fair value assumption discount rate   9.10%    
Share-based compensation fair value assumption expected term   5 years    
Share-based compensation fair value assumption volatility rate   19.37%    
Share-based compensation fair value assumption bond equivalent yield   1.742%    
Share-based compensation fair value assumption dividend yield   1.01%    
Restricted shares issued 3,000      
Restricted Stock [Member] | Officers and Directors [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period   3 years    
Restricted shares issued   23,240    
Unvested stock amortization   $ 940,000 $ 342,000  
Restricted Stock [Member] | Incentive Equity And Deferred Compensation Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares vested   47,720    
Shares awarded from cashless exercises that increased shares outstanding   26,952    
Cash equivalent of shares used to pay all applicable taxes   20,768