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Treasury Stock (Details) - $ / shares
3 Months Ended 6 Months Ended
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2019
Mar. 31, 2019
Jun. 30, 2020
Jun. 30, 2019
Equity, Class of Treasury Stock [Line Items]            
Shares of common stock repurchased at average cost 40,600 26,900 43,900 7,300 67,500 51,200
Repurchased shares of common stock average cost per share $ 12.61   $ 15.32   $ 13.16 $ 15.30
Remaining number of shares authorized to be repurchased under stock repurchase program 29,539   16,990   29,539 16,990
Treasury stock transferred to fund awards granted         20,830 5,186
Treasury stock transferred, average cost per share         $ 9.39 $ 9.39
2012 Equity Incentive Plan [Member]            
Equity, Class of Treasury Stock [Line Items]            
Treasury stock transferred, average cost per share         $ 9.39 $ 9.88
2012 Equity Incentive Plan [Member] | Stock Forfeitures [Member]            
Equity, Class of Treasury Stock [Line Items]            
Treasury stock transferred to fund awards granted         332 760