Commitments and Contingencies (Details) $ in Millions	12 Months Ended
Dec. 31, 2025 USD ($) community item	Dec. 31, 2024 USD ($)
Commitments and Contingencies
Contractual commitments \| $	$ 27.0	$ 17.6
Residential communities \| community	2
Number of investment units under construction \| item	358
Remaining estimated project costs \| $	$ 113.6
Parkside at Summers Corner
Commitments and Contingencies
Number of units acquired \| item	100
Number of remaining units acquired \| item	88
Aggregate purchase price \| $	$ 22.6

The number of consolidated units under construction.

No definition available.

Name:	bhm_NumberOfConsolidatedUnitsUnderConstruction
Namespace Prefix:	bhm_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

The number of residential communities under construction.

+ References

No definition available.

+ Details

Name:	bhm_NumberOfResidentialCommunitiesUnderConstruction
Namespace Prefix:	bhm_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

It represent the operating properties number of units to be acquired.

+ References

No definition available.

+ Details

Name:	bhm_OperatingPropertiesNumberOfUnitsToBeAcquired
Namespace Prefix:	bhm_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

It represents the remaining operating properties number of units to be acquired.

+ References

No definition available.

+ Details

Name:	bhm_OperatingPropertiesRemainingNumberOfUnitsToBeAcquired
Namespace Prefix:	bhm_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of remaining estimated cost of the project.

+ References

No definition available.

+ Details

Name:	bhm_RemainingEstimatedProjectCosts
Namespace Prefix:	bhm_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Purchase price of expected asset acquisition prior to consideration being transferred. Excludes business acquisition.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 805
-SubTopic 50
-Name Accounting Standards Codification
-Section 15
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480123/805-50-15-3

+ Details

Name:	us-gaap_AssetAcquisitionPriceOfAcquisitionExpected
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of contractual obligation, including, but not limited to, long-term debt, lease obligation, purchase obligation, and other commitments.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 942
-SubTopic 235
-Name Accounting Standards Codification
-Section S99
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477314/942-235-S99-2

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S50
-Paragraph 4
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480738/235-10-S50-4

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 3
-Subparagraph (SX 210.12-04(a))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480678/235-10-S99-3

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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

- Details

Name:	us-gaap_AssetAcquisitionAxis=bhm_ParksideAtSummersCornerMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: