Mortgages Payable (Details) - USD ($) $ in Thousands	Jun. 30, 2026	Dec. 31, 2025
Mortgages Payable
Deferred financing costs, net	$ (9,707)	$ (10,316)
Total mortgages payable	421,919	428,392
Mortgages
Mortgages Payable
Total	433,481	440,783
Fair value adjustments	(1,855)	(2,075)
Mortgages \| Fixed Rate
Mortgages Payable
Outstanding Principal	306,600	326,027
Mortgages \| Floating Rate
Mortgages Payable
Outstanding Principal	126,881	114,756
Allure at Southpark \| Mortgages \| Fixed Rate
Mortgages Payable
Outstanding Principal	$ 55,166	55,166
Interest rate on outstanding borrowings (as a percent)	5.58%
Amira at Westly \| Mortgages \| Fixed Rate
Mortgages Payable
Outstanding Principal	$ 56,650	56,650
Interest rate on outstanding borrowings (as a percent)	4.81%
Avenue at Timberlin Park \| Mortgages \| Fixed Rate
Mortgages Payable
Outstanding Principal	$ 23,660	23,660
Interest rate on outstanding borrowings (as a percent)	5.47%
District at Parkview \| Mortgages \| Fixed Rate
Mortgages Payable
Outstanding Principal	$ 38,625	38,625
Interest rate on outstanding borrowings (as a percent)	5.18%
ILE \| Mortgages \| Fixed Rate
Mortgages Payable
Outstanding Principal	$ 17,652	23,096
Interest rate on outstanding borrowings (as a percent)	4.31%
ILE \| Mortgages \| Floating Rate
Mortgages Payable
Outstanding Principal	$ 19,711	21,782
Interest rate on outstanding borrowings (as a percent)	6.50%
Parkside at Summers Corner \| Mortgages \| Floating Rate
Mortgages Payable
Outstanding Principal	$ 4,646
Interest rate on outstanding borrowings (as a percent)	5.86%
Skytop Apartments \| Mortgages \| Fixed Rate
Mortgages Payable
Outstanding Principal	$ 57,525	57,525
Interest rate on outstanding borrowings (as a percent)	4.98%
Southern Pines Reserve \| Mortgages \| Fixed Rate
Mortgages Payable
Outstanding Principal	$ 30,739	30,739
Interest rate on outstanding borrowings (as a percent)	5.13%
Villas at Huffmeister \| Mortgages \| Fixed Rate
Mortgages Payable
Outstanding Principal	$ 26,583	26,846
Interest rate on outstanding borrowings (as a percent)	3.56%
Yauger Park Villas \| Mortgages \| Fixed Rate
Mortgages Payable
Outstanding Principal		13,720
Yauger Park Villas \| Mortgages \| Floating Rate
Mortgages Payable
Outstanding Principal	$ 14,550
Interest rate on outstanding borrowings (as a percent)	5.45%
DB Loan \| Mortgages \| Floating Rate
Mortgages Payable
Outstanding Principal	$ 55,000	60,000
Interest rate on outstanding borrowings (as a percent)	5.45%
Harmony at Clear Creek \| Mortgages \| Floating Rate
Mortgages Payable
Outstanding Principal	$ 1	1
Interest rate on outstanding borrowings (as a percent)	6.78%
Wayford at Concord \| Mortgages \| Floating Rate
Mortgages Payable
Outstanding Principal	$ 32,973	$ 32,973
Interest rate on outstanding borrowings (as a percent)	4.73%

Carrying value as of the balance sheet date of total mortgages payable.

No definition available.

Name:	bhm_MortgagesPayable
Namespace Prefix:	bhm_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Carrying value as of the balance sheet date of mortgages payable, excluding payables held for sale.

+ References

No definition available.

+ Details

Name:	bhm_MortgagesPayableExcludingPayablesHeldForSale
Namespace Prefix:	bhm_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

+ Details

Name:	us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount, after accumulated amortization, of debt discount (premium).

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 835
-SubTopic 30
-Name Accounting Standards Codification
-Section 45
-Paragraph 1A
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482925/835-30-45-1A

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 835
-SubTopic 30
-Name Accounting Standards Codification
-Section 45
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482925/835-30-45-2

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 835
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482900/835-30-50-1

Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1D
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481139/470-20-50-1D

+ Details

Name:	us-gaap_DebtInstrumentUnamortizedDiscountPremiumNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

+ References

+ Details

Name:	us-gaap_DeferredFinanceCostsNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 942
-SubTopic 210
-Name Accounting Standards Codification
-Section S45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477657/942-210-S45-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 942
-SubTopic 210
-Name Accounting Standards Codification
-Section S50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478478/942-210-S50-1

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 942
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(13)(3)(a))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S50
-Paragraph 8
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480657/210-10-S50-8

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(19)(b))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

Reference 6: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480738/235-10-S50-1

Reference 7: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(f))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480678/235-10-S99-1

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 6
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481544/470-10-50-6

Reference 9: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 470
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 6
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481544/470-10-50-6

+ Details

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

- Definition

Carrying value as of the balance sheet date, including the current and noncurrent portions, of collateralized debt obligations (with maturities initially due after one year or beyond the operating cycle, if longer). Such obligations include mortgage loans, chattel loans, and any other borrowings secured by assets of the borrower.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 942
-SubTopic 210
-Name Accounting Standards Codification
-Section S45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477657/942-210-S45-1

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 942
-SubTopic 210
-Name Accounting Standards Codification
-Section S50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478478/942-210-S50-1

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 942
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1

Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S50
-Paragraph 9
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480657/210-10-S50-9

Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

Reference 6: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 944
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(16)(a)(2))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1

+ Details

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