Stock-Based Compensation Plans and Arrangements - Stock Option Activity (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Number of Options
Beginning balance (in shares)	789,846
Granted (in shares)	0
Exercised (in shares)	(545,971)
Canceled (in shares)	(2,200)
Ending balance (in shares)	241,675	789,846
Exercisable (in shares)	241,675
Weighted Average Exercise Price per Share
Beginning balance (in dollars per share)	$ 4.75
Granted (in dollars per share)	0
Exercised (in dollars per share)	4.51
Canceled (in dollars per share)	3.70
Ending balance (in dollars per share)	5.24	$ 4.75
Exercisable (in dollars per share)	$ 5.24
Weighted Average Remaining Contractual Term
Weighted Average Remaining Contractual Term, Outstanding, ending balance	1 month 6 days
Weighted Average Remaining Contractual Term, Exercisable, ending balance	1 month 6 days
Aggregate Intrinsic Value
Aggregate Intrinsic Value, Outstanding, ending balance	$ 1,727,000
Aggregate Intrinsic Value, Exercisable, ending balance	1,727,000
Total intrinsic value of options exercised	3,000,000	$ 4,000,000	$ 17,000,000
Cash received from option exercises	0
Tax benefit from exercise of stock options	$ 1,000,000