Capital Requirements - General Information (Details)		9 Months Ended	12 Months Ended
	Mar. 27, 2020	Sep. 30, 2021	Dec. 31, 2020
Capital Requirements
Period to delay the estimated impact of the adoption of the CECL Standard to regulatory capital as the company elected the option	2 years
Addition period for transition	3 years
Capital conservation buffer (as a percent)		2.50%	2.50%
HBC (Wholly-owned Subsidiary)
Capital Requirements
Capital conservation buffer (as a percent)		2.50%	2.50%