Earnings Per Common Share - Summary of Securities Excluded from Computation of Earnings per Share (Details) - shares shares in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Stock options
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive shares excluded from computing diluted earnings per share (in shares)	31	84	31	84
Restricted stock
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive shares excluded from computing diluted earnings per share (in shares)	0	0	0	0
Shares subject to the outstanding warrant issued in connection with the CPP transaction
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive shares excluded from computing diluted earnings per share (in shares)	104	104	104	104
Convertible preferred stock
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive shares excluded from computing diluted earnings per share (in shares)	500	505	500	505