Capital Requirements - General Information (Details) - USD ($)	3 Months Ended	9 Months Ended	12 Months Ended
	Jun. 30, 2017	Sep. 30, 2017	Dec. 31, 2016
Capital Requirements
Capital conservation buffer (as a percent)		1.25%	0.625%
Subordinated debt, net of issuance costs		$ 39,137,000
Downstream of proceeds from subordinated debt to HBC		20,000,000
HCC (Parent)
Capital Requirements
Dividends paid to parent company	$ 4,000,000	$ 12,000,000
HBC (Wholly-owned Subsidiary)
Capital Requirements
Capital conservation buffer (as a percent)		1.25%	0.625%