Stock-Based Compensation Plans and Arrangements - Stock Option Activity (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Number of Options
Beginning balance (in shares)	1,391,819
Granted (in shares)	0
Exercised (in shares)	(593,806)
Canceled (in shares)	(8,167)
Ending balance (in shares)	789,846	1,391,819
Exercisable (in shares)	789,846
Weighted Average Exercise Price per Share
Beginning balance (in dollars per share)	$ 10.44
Granted (in dollars per share)	0
Exercised (in dollars per share)	3.63
Canceled (in dollars per share)	3.94
Ending balance (in dollars per share)	4.75	$ 10.44
Exercisable (in dollars per share)	$ 4.75
Weighted Average Remaining Contractual Term
Weighted Average Remaining Contractual Term, Outstanding, ending balance	8 months 12 days
Weighted Average Remaining Contractual Term, Exercisable, ending balance	8 months 12 days
Aggregate Intrinsic Value
Aggregate Intrinsic Value, Outstanding, ending balance	$ 3,284
Aggregate Intrinsic Value, Exercisable, ending balance	3,284
Total intrinsic value of options exercised	4,000	$ 17,000	$ 16,000
Cash received from option exercises	0
Tax benefit from exercise of stock options	$ 1,000