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Commitments - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2019 USD ($)
Commitments and Contingencies Disclosure [Abstract]
Loan commitments maturities period	1 year
Commitments which present an unusual risk	$ 0
Material losses anticipated	$ 0

X

- Definition

Commitments presenting unusual risk.

+ References

No definition available.

+ Details

Name:	hbcp_CommitmentsPresentingUnusualRisk
Namespace Prefix:	hbcp_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Material losses anticipated as a result of transactions.

+ References

No definition available.

+ Details

Name:	hbcp_MaterialLossesAnticipatedAsResultOfTransactions
Namespace Prefix:	hbcp_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Maximum maturity period of contingent liabilities.

+ References

No definition available.

+ Details

Name:	hbcp_MaximumMaturityPeriodOfContingentLiabilities
Namespace Prefix:	hbcp_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	us-gaap_CommitmentsAndContingenciesDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration