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Share-based Compensation - Restricted and Deferred Stock Units (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Additional disclosures    
Stock Issued During Period Shares Equity Instruments Other than Options Vested and Related Tax Benefit 9,070  
RSU    
Shares    
Non-vested at beginning of year (in shares) 690,495  
Dividend equivalents earned (in shares) 5,729  
Non-vested at end of year (in shares) 696,224  
Outstanding at end of year (in shares) 696,224  
Weighted-Average Grant Date Fair Value    
Non-vested at beginning of year (in dollars per share) $ 26.14  
Dividend equivalents earned (in dollars per share) 25.31  
Non-vested at end of year (in dollars per share) 26.13  
Outstanding at end of year (in dollars per share) $ 26.13  
DSUs    
Shares    
Non-vested at beginning of year (in shares) 20,449  
Dividend equivalents earned (in shares) 157  
Vested (in shares) (1,512)  
Forfeited (in shares) (1,523)  
Non-vested at end of year (in shares) 17,571  
Outstanding at end of year (in shares) 76,750  
Weighted-Average Grant Date Fair Value    
Non-vested at beginning of year (in dollars per share) $ 27.93  
Dividend equivalents earned (in dollars per share) 25.31  
Vested (in dollars per share) 31.67  
Forfeited (in dollars per share) 31.62  
Non-vested at end of year (in dollars per share) 27.26  
Outstanding at end of year (in dollars per share) $ 27.57  
RSUs and DSUs    
Additional disclosures    
Compensation expense recognized $ 1.0 $ 0.8
Amount of compensation cost to be recognized $ 9.9  
Period over which cost will be recognized 3 years 6 months  
Employee stock purchase plan    
Additional disclosures    
Remaining shares available for issuance 59,329  
Stock option awards    
Additional disclosures    
Compensation expense recognized   $ 0.1
Unrecognized stock option expense $ 0.1  
First Community 2016 Equity Incentive Plan    
Additional disclosures    
Remaining shares available for issuance 308,617  
2010 Equity Incentive Plan    
Additional disclosures    
Remaining shares available for issuance 731,118