Stock Compensation Plans - Stock option activity (Details) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2020 USD ($) $ / shares shares
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Options outstanding, January 1, 2020 | shares	17,700
Option Outstanding, Exchanged | shares	39,983
Options outstanding, March 31, 2020 | shares	57,683
Vested or expected to vest at March 31, 2020 | shares	57,683
Exercisable at March 31, 2020 | shares	55,783
Weighted Average Exercise Price, Options outstanding, January 1, 2020 | $ / shares	$ 17.60
Weighted Average Exercise Price, Exchanged | $ / shares	16.00
Weighted Average Exercise Price, Options outstanding, March 31, 2020 | $ / shares	16.49
Weighted Average Exercise Price, Vested or expected to vest at March 31, 2020 | $ / shares	16.49
Weighted Average Exercise Price, Exercisable at March 31, 2020 | $ / shares	$ 16.41
Weighted Average Remaining Contractual Term (In years), outstanding, March 31, 2020	5 years 21 days
Weighted Average Remaining Contractual Terms (In years), Vested or expected to vest at March 31, 2020	5 years 21 days
Weighted Average Remaining Contractual Terms (In years), Exercisable at March 31, 2020	5 years 14 days
Aggregate Intrinsic Value, outstanding, March 31, 2020 | $	$ 152
Aggregate Intrinsic Value, Vested or expected to vest at March 31, 2020 | $	152
Aggregate Intrinsic Value, Exercisable at March 31, 2020 | $	$ 152