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Employee Benefit Plans - Stock option activity and option plans (Details) - $ / shares
6 Months Ended 12 Months Ended
Jul. 02, 2018
Dec. 31, 2019
Dec. 31, 2018
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Beginning of Period [Abstract]      
Stock options grants to senior management and directors 20,000 0  
2017 Equity Incentive Plan      
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Beginning of Period [Abstract]      
Outstanding at beginning of year   172,080 152,080
Stock options grants to senior management and directors   0 20,000
Exercised   0 0
Outstanding at year end   172,080 172,080
Exercisable at year end   64,832 30,416
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, End of Period [Abstract]      
Outstanding at beginning of year   $ 16.82 $ 16.72
Grants   0.00 17.58
Exercised   0.00  
Outstanding at year end   16.82 16.82
Exercisable at year end   16.77 16.72
2017 Equity Incentive Plan | Maximum | Exercise Price Range From 16.69 To 16.72 [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Exercise Price Range Upper Range Limit     16.72
2017 Equity Incentive Plan | Maximum | Exercise Price Range From 17.52 To 17.75 [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Exercise Price Range Upper Range Limit     17.75
2017 Equity Incentive Plan | Maximum | Exercise Price Range From 16.69 To 17.75 [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Exercise Price Range Upper Range Limit   17.75 17.75
2017 Equity Incentive Plan | Minimum | Exercise Price Range From 16.69 To 16.72 [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Exercise Price Range Lower Range Limit     16.69
2017 Equity Incentive Plan | Minimum | Exercise Price Range From 17.52 To 17.75 [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Exercise Price Range Lower Range Limit     17.52
2017 Equity Incentive Plan | Minimum | Exercise Price Range From 16.69 To 17.75 [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Exercise Price Range Lower Range Limit   $ 16.69 $ 16.69