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Share-based Compensation (Details) - USD ($)
12 Months Ended
Dec. 31, 2019
Feb. 05, 2020
May 22, 2019
Dec. 31, 2018
Dec. 31, 2017
Feb. 03, 2015
Share-based Compensation            
Period from effective date after which no awards may be granted 10 years          
Number of shares held in treasury 1,121,961     310,745    
Shares authorized for repurchase under stock repurchase plan   2,000,000 1,000,000     666,667
Number of shares that may yet be purchased 389,938          
Restricted stock unit            
Share-based Compensation            
Number of shares of common stock per award 1          
Minimum | Restricted stock unit            
Share-based Compensation            
Requisite service periods 1 year          
Minimum | Deferred stock units            
Share-based Compensation            
Vesting period 12 months          
Maximum | Restricted stock unit            
Share-based Compensation            
Requisite service periods 5 years          
Directors | Deferred stock units            
Share-based Compensation            
Number of shares of common stock per award 1          
Settlement period 30 days          
2010 Equity Incentive Plan            
Share-based Compensation            
Maximum number of shares that may be delivered to participants 1,333,333          
2010 Equity Incentive Plan | Maximum | Options and SARs            
Share-based Compensation            
Shares available for grant during any calendar year 133,333          
2010 Equity Incentive Plan | Maximum | Stock awards            
Share-based Compensation            
Shares available for grant during any calendar year 66,667          
2010 Equity Incentive Plan | Maximum | Cash incentive awards and cash-settled stock awards            
Share-based Compensation            
Amount of award payable with respect to any calendar year $ 1,000,000          
First Community 2016 Equity Incentive Plan            
Share-based Compensation            
Maximum number of shares that may be delivered to participants         443,619