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Employee Benefit Plans - Narrative (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2020
USD ($)
payment
shares
Mar. 31, 2019
USD ($)
Dec. 31, 2019
USD ($)
shares
Dec. 31, 2018
USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Options, outstanding (in shares) | shares 709,811   614,311  
Defined contribution plan, maximum annual contributions per employee, percent 80.00%      
Defined contribution plan employer discretionary contribution amount $ 185 $ 146    
Deferred fees 491 312    
Interest paid on deferred fees 28 23    
Distributions paid $ 2 3    
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 $ 3,639 2,823 $ 3,571 $ 2,747
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%      
Payment term after separation 36 months      
Retirement benefit payable as percent of average Executive's base salary for 36 months preceding separation from service, adjustment thereafter 2.00%      
Number of annual payments after separation | payment 15      
Expected future benefit payment $ 6,600      
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 $ 24      
Life insurance plan with a post retirement death benefit 250      
Life insurance plan aggregate expenses $ 1 $ 1    
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 10 years      
Options, award expiration period 3 years      
Number of shares authorized | shares 327,100      
Options, outstanding (in shares) | shares 500,000      
Options, exercised forfeited or expired (shares) | shares 142,000      
Number of shares available for grant | shares 30,900      
Compensation cost not yet recognized $ 1,500      
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]        
Compensation cost recognition weighted average period 2 years 8 months 12 days      
Nonvested awards, compensation not yet recognized, awards other than options $ 1,600