Income Taxes - Effective tax rate based upon total income tax provision (benefit) from continuing operations (Details)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Income Taxes
Federal statutory rate	21.00%	21.00%
Permanent non-deductible expenses	2.60%	0.30%
Business credits	(3.00%)	(0.60%)
ESOP dividend	(0.60%)	(0.40%)
Stock compensation	(0.10%)	(0.40%)
Domestic production activities deduction	(0.00%)	(0.40%)
Foreign-derived intangible income deduction	(1.20%)	(1.80%)
State taxes, net of federal benefit	1.30%	0.00%
Other	1.50%	(0.30%)
Effective tax rate	21.50%	17.40%