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Investments in Real Estate - Preferred Equity Investments (Details) | 12 Months Ended
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Dec. 31, 2025 item
Investments in Real Estate |
Total Development Units | 939
Total Operating Units | 210
Total Units | 1,149
Archer at RiverBlue |
Investments in Real Estate |
Location / Market | Asheville, NC
Total Development Units | 245
Canvas at Wildwood |
Investments in Real Estate |
Location / Market | Wildwood, FL
Total Development Units | 224
River Ford |
Investments in Real Estate |
Location / Market | Brunswick, GA
Total Development Units | 170
Sanford Marketplace |
Investments in Real Estate |
Location / Market | Sanford, NC
Total Development Units | 300
Wayford at Innovation Park |
Investments in Real Estate |
Location / Market | Charlotte, NC
Total Operating Units | 210

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- Definition It represents the total number of unit included lease-up, development and operating investments. + References No definition available. + Details
Name: | bhm_NumberOfTotalUnits
Namespace Prefix: | bhm_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition It represent the operating properties number of units. + References No definition available. + Details
Name: | bhm_OperatingPropertiesNumberOfUnits
Namespace Prefix: | bhm_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition It represent the Preferred Equity and Loan Investments, Development Units. + References No definition available. + Details
Name: | bhm_PreferredEquityAndLoanInvestmentsDevelopmentUnits
Namespace Prefix: | bhm_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Line items represent financial concepts included in a tables. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the tables. + References No definition available. + Details
Name: | bhm_RealEstateAssetsHeldForDevelopmentAndSaleLineItems
Namespace Prefix: | bhm_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition It represents the real estate property location. + References No definition available. + Details
Name: | bhm_RealEstatePropertyLocation
Namespace Prefix: | bhm_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=bhm_ArcherAtRiverblueMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=bhm_CanvasAtWildwoodMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=bhm_RiverFordMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=bhm_SanfordMarketplaceMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=bhm_WayfordAtInnovationParkMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |