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Share-based Compensation (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Aug. 01, 2018
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2015
Dec. 31, 2017
Feb. 03, 2015
Share-based Compensation                
Number of shares held in treasury   325,272   325,272     500,638  
Shares authorized for repurchase under stock repurchase plan               666,667
Purchase of treasury stock           333,333    
Number of shares that may yet be purchased   333,334   333,334        
Stock option awards                
Shares                
Outstanding at beginning of year (in shares)       213,428        
Exercised (in shares)       (85,518)        
Forfeited (in shares)       (14,035)        
Expired (in shares)       (2,762)        
Outstanding at end of year (in shares)   111,113   111,113        
Exercisable at end of year (in shares)   73,469   73,469        
Weighted-Average Exercise Price                
Outstanding at beginning of year (in dollars per share)       $ 16.97        
Exercised (in dollars per share)       13.90        
Forfeited (in dollars per share)       21.81        
Expired (in dollars per share)       16.15        
Outstanding at end of year (in dollars per share)   $ 18.75   18.75        
Exercisable at end of year (in dollars per share)   $ 16.30   $ 16.30        
Weighted-Average Remaining Contractual Term                
Outstanding at end of period       4 years 7 months 28 days        
Exercisable at end of period       2 years 10 months 13 days        
Additional disclosures                
Compensation expense recognized   $ 0.1 $ 0.1 $ 0.2 $ 0.1      
Unrecognized stock option expense   $ 0.2   $ 0.2        
Period over which cost will be recognized       1 year 1 month 6 days        
RSU                
Share-based Compensation                
Number of shares of common stock per award       1        
Shares                
Non-vested at beginning of year (in shares)       587,763        
Reclass DSU to RSU       23,977        
Granted (in shares)       172,571        
Dividend equivalents earned (in shares)       11,870        
Vested (in shares)       (104,512)        
Forfeited (in shares)       (6,183)        
Non-vested at end of year (in shares)   685,486   685,486        
Outstanding at end of year (in shares)   685,486   685,486        
Weighted-Average Grant Date Fair Value                
Non-vested at beginning of year (in dollars per share)       $ 22.68        
Reclass DSU to RSU (in dollars per share)       25.47        
Granted (in dollars per share)       31.70        
Dividend equivalents earned (in dollars per share)       31.05        
Vested (in dollars per share)       16.40        
Forfeited (in dollars per share)       24.84        
Non-vested at end of year (in dollars per share)   $ 26.13   26.13        
Outstanding at end of year (in dollars per share)   $ 26.13   $ 26.13        
RSU | Minimum                
Share-based Compensation                
Requisite service periods       1 year        
RSU | Maximum                
Share-based Compensation                
Requisite service periods       5 years        
RSU | Members of management                
Weighted-Average Grant Date Fair Value                
Granted (in dollars per share) $ 31.70              
Additional disclosures                
Amount of compensation cost to be recognized $ 5.2              
Vesting percentage (as a percent) 100.00%              
RSU | Members of management | Minimum                
Additional disclosures                
Period over which cost will be recognized 4 years              
RSU | Members of management | Maximum                
Additional disclosures                
Period over which cost will be recognized 5 years              
RSU | Chairman                
Weighted-Average Grant Date Fair Value                
Granted (in dollars per share) $ 31.70              
Additional disclosures                
Period over which cost will be recognized 5 years              
Vesting percentage (as a percent) 100.00%              
DSUs                
Shares                
Non-vested at beginning of year (in shares)       42,411        
Reclass DSU to RSU       23,977        
Granted (in shares)       20,500        
Dividend equivalents earned (in shares)       1,669        
Vested (in shares)       (20,103)        
Non-vested at end of year (in shares)   20,500   20,500        
Outstanding at end of year (in shares)   86,270   86,270        
Weighted-Average Grant Date Fair Value                
Non-vested at beginning of year (in dollars per share)       $ 25.47        
Reclass DSU to RSU (in dollars per share)       25.47        
Granted (in dollars per share)       31.70        
Dividend equivalents earned (in dollars per share)       30.98        
Vested (in dollars per share)       29.74        
Non-vested at end of year (in dollars per share)   $ 27.97   27.97        
Outstanding at end of year (in dollars per share)   $ 22.41   $ 22.41        
DSUs | Board of directors and advisory directors                
Share-based Compensation                
Number of shares of common stock per award       1        
Settlement period       30 days        
DSUs and Advisory DSUs | Directors and Advisory Directors                
Share-based Compensation                
Requisite service periods 1 year              
Weighted-Average Grant Date Fair Value                
Granted (in dollars per share) $ 31.70              
Additional disclosures                
Amount of compensation cost to be recognized $ 0.6              
RSUs and DSUs                
Additional disclosures                
Compensation expense recognized   $ 0.9 $ 0.7 $ 2.5 $ 1.9      
Amount of compensation cost to be recognized   $ 12.0   $ 12.0        
Period over which cost will be recognized       3 years 9 months 18 days        
Employee stock purchase plan                
Additional disclosures                
Remaining shares available for issuance   75,674   75,674        
First Community 2016 Equity Incentive Plan                
Additional disclosures                
Remaining shares available for issuance   305,781   305,781        
First Community 2016 Equity Incentive Plan | RSU | Members of management                
Shares                
Granted (in shares) 12,545              
First Community 2016 Equity Incentive Plan | DSUs | Directors                
Shares                
Granted (in shares) 1,500              
2010 Equity Incentive Plan                
Additional disclosures                
Remaining shares available for issuance   740,943   740,943        
2010 Equity Incentive Plan | RSU | Members of management                
Shares                
Granted (in shares) 152,926              
2010 Equity Incentive Plan | RSU | Chairman                
Shares                
Granted (in shares) 7,100              
Additional disclosures                
Amount of compensation cost to be recognized $ 0.2              
2010 Equity Incentive Plan | DSUs | Directors                
Shares                
Granted (in shares) 17,500              
2010 Equity Incentive Plan | Advisory DSUs | Advisory Directors                
Shares                
Granted (in shares) 1,500