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Stock-Based Compensation - Summarizes of Activity of Nonvested Restricted Stock (Details) - Restricted Stock
3 Months Ended
Mar. 31, 2019
shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Nonvested beginning balance 20,908
Number of Shares Outstanding, Vested (15,681)
Nonvested ending balance 5,227