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Stock-Based Compensation (Stock Options Narrative) (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock options outstanding (in shares) 458,000 929,000 2,262,000 1,763,000
Grants in period (in shares)     1,222,000  
Weighted average fair value of options granted (in usd per share)     $ 11.78  
Adjustments to additional paid-in capital for fair value of options granted     $ 565  
Value of stock issued during period resulting from exercise of stock options $ 945      
Fair value of options exercisable $ 851      
Weighted average contractual life of outstanding options (in years) 1 year 1 month      
Weighted average contractual life of exercisable options (in years)   2 years 3 months    
Parkway Key Executives        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Grants in period (in shares)     672,375  
Weighted average fair value of options granted (in usd per share)     $ 0.84  
Stock Options        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock options outstanding (in shares) 458,154      
Term life of stock options (years) 10 years      
Vesting period 4 years      
Number of stock issued during period (in shares) 47,309      
Stock Options | Parkway Key Executives        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period     10 years