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Employee Benefit Plans - Narrative (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
USD ($)
shares
Sep. 30, 2017
USD ($)
Sep. 30, 2018
USD ($)
installment
shares
Sep. 30, 2017
USD ($)
Dec. 31, 2017
USD ($)
shares
Dec. 31, 2016
USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Options, outstanding (in shares) | shares 510,667   510,667   504,573  
Defined contribution plan employer discretionary contribution amount $ 146 $ 119 $ 458 $ 376    
Deferred fees 22 8 282 134    
Interest paid on deferred fees 18 11 49 32    
Distributions paid 2 3 9 3    
Defined benefit plans future payments $ 2,393 1,141 $ 2,393 1,141 $ 1,187 $ 1,023
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 60.00%   60.00%      
Retirement benefit payable as percent of average Executive's base salary for 36 months preceding separation from service, adjustment thereafter 2.00%   2.00%      
Number of annual payments after separation | installment     15      
Discount rate used to calculate the present value of the benefit obligation 4.00%   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 $ 66   $ 66      
Life insurance plan with a post retirement death benefit 250   250      
Life insurance plan aggregate expenses $ 8 $ 1 $ 10 $ 4    
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 2,462,585   2,462,585      
Options, outstanding (in shares) | shares 510,667   510,667      
Options, exercised forfeited or expired (shares) | shares     1,676,613      
Number of shares available for grant | shares 275,305   275,305      
Compensation cost not yet recognized $ 702   $ 702      
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 74,728   74,728      
Compensation cost recognition weighted average period     2 years 8 months 12 days      
Nonvested awards, compensation not yet recognized, awards other than options $ 1,200   $ 1,200