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Investments in Real Estate - Additional Information (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2025 | Dec. 31, 2024
Investments in Real Estate |  |
Investments in real estate of depreciation expense | $ 24.7 | $ 17.4
Security Deposit Liability | $ 2.9 | $ 2.4

X
- Definition It represents amount of depreciation expense of real estate investment. + References No definition available. + Details
Name: | bhm_InvestmentsInRealEstateOfDepreciationExpense
Namespace Prefix: | bhm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_RealEstateAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition This element represents money paid in advance to protect the provider of a product or service, such as a lessor, against damage or nonpayment by the buyer or tenant (lessee) during the term of the agreement. Such damages may include physical damage to the property, theft of property, and other contractual breaches. Security deposits held may be interest or noninterest bearing. + References No definition available. + Details
Name: | us-gaap_SecurityDepositLiability
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant