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Share-based Compensation - Award Status (Details)
12 Months Ended
Jul. 02, 2017
$ / shares
Jun. 30, 2017
$ / shares
Dec. 31, 2019
$ / shares
shares
Additional disclosures      
Per share cash consideration entitled (in dollars per share) $ 1.35    
First Community      
Additional disclosures      
Share consideration conversion ratio   0.396  
Per share cash consideration entitled (in dollars per share)   $ 1.35  
Stock option awards      
Shares      
Outstanding at beginning of year (in shares) | shares     87,600
Exercised (in shares) | shares     (25,351)
Forfeited (in shares) | shares     (3,297)
Expired (in shares) | shares     (5,767)
Outstanding at end of year (in shares) | shares     53,185
Exercisable at end of year (in shares) | shares     53,185
Weighted-Average Exercise Price      
Outstanding at beginning of year (in dollars per share)     $ 20.58
Exercised (in dollars per share)     17.94
Forfeited (in dollars per share)     23.53
Expired (in dollars per share)     17.38
Outstanding at end of year (in dollars per share)     22.00
Exercisable at end of year (in dollars per share)     $ 22.00