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Earnings Per Share - Schedule of Shares not Considered in Computing Diluted Earnings per Common Share (Details) - shares
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Stock Options      
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]      
Antidilutive shares 51,952 57,926  
Performance Stock Units      
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]      
Antidilutive shares 59,658    
Series A Preferred Dividends      
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]      
Antidilutive shares     315,773
Series B Preferred Dividends      
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]      
Antidilutive shares     360,578