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Significant Accounting Policies - Narrative (Details)
3 Months Ended 9 Months Ended
Aug. 26, 2016
Sep. 30, 2016
USD ($)
shares
Sep. 30, 2015
USD ($)
shares
Sep. 30, 2016
USD ($)
installment
shares
Sep. 30, 2015
USD ($)
shares
Dec. 31, 2015
USD ($)
shares
Dec. 31, 2014
USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Stock dividend, percentage 10.00%     10.00%      
Options, outstanding (in shares) | shares   589,132   589,132   522,338  
Number of options exercised | shares   4,620 578 24,998 578    
Defined contribution plan, maximum annual contributions per employee, percent       80.00%      
Defined contribution plan employer discretionary contribution amount   $ 110,000 $ 87,000 $ 289,000 $ 232,000    
Deferred fees   5,900 5,800 37,500 32,100    
Interest paid on deferred fees   8,700 6,600 25,000 19,400    
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   997,000 900,000 $ 997,000 900,000 $ 923,000 $ 0
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 $ 4,000 $ 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   2,112,585   2,112,585      
Options, outstanding (in shares) | shares   589,132   589,132      
Options, exercised forfeited or expired (shares) | shares       1,402,804      
Number of shares available for grant | shares   120,649   120,649      
Compensation cost not yet recognized   $ 370,000   $ 370,000      
Compensation cost recognition weighted average period       2 years      
Restricted Stock              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Award vesting period       4 years      
Number of shares authorized | shares   518,157   518,157      
Number of shares available for grant | shares   159,604   159,604      
Compensation cost recognition weighted average period       2 years 7 months 6 days      
Nonvested awards, compensation not yet recognized, awards other than options   $ 629,000   $ 629,000