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Employee Benefit and Deferred Compensation Plans - Summary of the Changes in Stock Options (Details) - $ / shares
6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Shares    
Options outstanding at beginning of period (shares) 29,250  
Granted (shares) 0 0
Exercised (shares) 0  
Forfeited (shares) 0  
Options outstanding at end of period (shares) 29,250  
Weighted Average Exercise Price    
Options outstanding at beginning of period (usd per share) $ 15.86  
Granted (usd per share) 0  
Exercised (usd per share) 0  
Forfeited (usd per share) 0  
Options outstanding at end of period (usd per share) $ 15.86