Stock Compensation Plans - Unvested Stock Options and Activity (Details) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2019 USD ($) $ / shares shares
Number of Stock Options
Outstanding at the beginning of the period (in shares)	210,178
Add: Options granted (in shares)	1,272
Less: Options vested (in shares)	111,615
Less: Options forfeited/cancelled (in shares)	1,316
Outstanding at the end of the period (in shares)	98,519
Weighted-Average Grant Date Fair Value
Outstanding at the beginning of the period (in dollars per share) | $ / shares	$ 14.21
Add: Options granted (in dollars per share) | $ / shares	10.32
Less: Options vested (in dollars per share) | $ / shares	14.04
Less: options forfeited (in dollars per share) | $ / shares	13.73
Outstanding at the end of the period (in dollars per share) | $ / shares	$ 14.41
Stock options.
Additional disclosures
Shares outstanding that vested and would have been exercisable had the participants reached retirement age (in shares)	61,000
Aggregate grant date fair value of options subject to accelerated vesting | $	$ 0.9
Aggregate grant date fair value of options vested, including options subject to accelerated vesting | $	1.6
Maximum | Stock options.
Additional disclosures
Accelerated compensation expense (in dollars) | $	$ 0.1