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Earnings per Share - Repurchase Program (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Mar. 31, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Jun. 30, 2021
Dec. 31, 2019
Earnings Per Share              
Stock repurchased     $ 97 $ 2,148 $ 906    
Repurchase Program              
Earnings Per Share              
Value of shares authorized for repurchase           $ 5,000 $ 5,000
Total number of common stock repurchased 0            
Stock repurchased (in shares)   117,632          
Stock repurchased (in dollars per share)   $ 18.26          
Stock repurchased   $ 2,100          
Remaining available for repurchase of shares $ 5,000     $ 5,000