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Significant Accounting Policies - Stock Transactions - Stock Option Plans Narrative (Details)
3 Months Ended 6 Months Ended
Jun. 30, 2016
USD ($)
shares
Jun. 30, 2015
USD ($)
shares
Jun. 30, 2016
USD ($)
installment
shares
Jun. 30, 2015
USD ($)
shares
Dec. 31, 2015
USD ($)
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Options, outstanding (in shares) | shares 545,871   545,871   475,396
Number of options exercised | shares 18,525 0 18,525 0  
Defined contribution plan, maximum annual contributions per employee, percent     80.00%    
Defined contribution plan employer discretionary contribution amount $ 90,000 $ 69,000 $ 179,000 $ 145,000  
Deferred fees 4,900 5,400 31,600 26,300  
Interest paid on deferred fees 7,600 6,500 14,900 12,800  
Distributions paid 0 0 $ 0 0  
Description of defined contribution pension and other postretirement plans     Upon separation from service after age 66, the President and CEO will be entitled to an annual benefit in the amount of $156,000 payable in fifteen annual installments subject to annual 2% increases.    
Defined benefit plans future payments 973,000   $ 973,000   $ 923,000
Director          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Deferred compensation arrangement guaranteed award percentage     100.00%    
Executive Management          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Deferred compensation arrangement guaranteed award percentage     100.00%    
Supplemental Employee Retirement Plan | President And Chief Executive Officer          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Pension and other postretirement benefit contributions     $ 156,000    
Number of installment payments | installment     15    
Rate of compensation increase     2.00%    
Defined benefit plans future payments $ 2,700,000   $ 2,700,000    
Discount rate used to calculate the present value of the benefit obligation 3.84%   3.84%    
Vesting percentage     3.00%    
Award vesting rights, percentage     100.00%    
Other Postretirement Benefit Plan | Executive Management          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Deferred compensation arrangement guaranteed award percentage     7.50%    
Award vesting rights, percentage     100.00%    
Accrued expense under the plan $ 30,000   $ 30,000    
Life insurance plan with a post retirement death benefit 250,000   250,000    
Life insurance plan aggregate expenses $ 1,000 $ 1,000 $ 2,000 $ 2,000  
Other Postretirement Benefit Plan | Executive Management | Maximum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Deferred compensation arrangement guaranteed award percentage     15.00%    
Stock Options          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting period     3 years    
Options, award expiration period     10 years    
Number of shares authorized | shares 1,920,529   1,920,529    
Options, outstanding (in shares) | shares 545,871   545,871    
Options, exercised forfeited or expired (shares) | shares     1,271,073    
Number of shares available for grant | shares 103,585   103,585    
Compensation cost not yet recognized $ 430,000   $ 430,000    
Compensation cost recognition weighted average period     2 years 2 months 12 days    
Restricted Stock          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting period     4 years    
Number of shares authorized | shares 471,551   471,551    
Number of shares available for grant | shares 146,350   146,350    
Compensation cost recognition weighted average period     2 years 8 months 12 days    
Nonvested awards, compensation not yet recognized, awards other than options $ 716,000   $ 716,000