XML 42 R31.htm IDEA: XBRL DOCUMENT v3.7.0.1
Significant Accounting Policies - Narrative (Details) - USD ($)
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Sep. 30, 2016
Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock dividend, percentage       10.00%  
Options, outstanding (in shares) 582,188   552,759    
Defined contribution plan, maximum annual contributions per employee, percent 80.00%        
Defined contribution plan employer discretionary contribution amount $ 119,000 $ 89,000      
Deferred fees 120,000 102,000      
Interest paid on deferred fees 10,000 8,000      
Distributions paid $ 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 $ 1,049,000 948,000 $ 1,023,000   $ 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]          
Retirement benefit payable as percent of average Executive's base salary for 36 months preceding separation from service 40.00%        
Retirement benefit payable as percent of average Executive's base salary for 36 months preceding separation from service, adjustment thereafter 2.00%        
Defined benefit plans future payments $ 3,400,000        
Discount rate used to calculate the present value of the benefit obligation 4.00%        
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 $ 23,000        
Life insurance plan with a post retirement death benefit 250,000        
Life insurance plan aggregate expenses $ 1,000 $ 1,000      
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 2,112,585        
Options, outstanding (in shares) 582,188        
Options, exercised forfeited or expired (shares) 1,498,025        
Number of shares available for grant 32,372        
Compensation cost not yet recognized $ 571,000        
Compensation cost recognition weighted average period 2 years 3 months 18 days        
Restricted Stock          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting period 4 years        
Number of shares authorized 518,157        
Number of shares available for grant 111,404        
Compensation cost recognition weighted average period 3 years 2 months 12 days        
Nonvested awards, compensation not yet recognized, awards other than options $ 1,200,000