Capital Requirements - General Information (Details)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Capital Requirements
Phase-in period (in years)		4 years
Capital conservation buffer (as a percent)		1.875%	1.25%	0.625%
Forecast
Capital Requirements
Capital conservation buffer (as a percent)	2.50%
HBC (Wholly-owned Subsidiary)
Capital Requirements
Capital conservation buffer (as a percent)		1.875%	1.25%