Retirement Plans - Summary of Shares Allocations are Accounted For Fair Value on The Date of Allocations (Detail) - USD ($)	Sep. 30, 2019	Dec. 31, 2018
Compensation And Retirement Disclosure [Abstract]
Number of ESOP shares allocated	66,308	33,832
Number of ESOP shares committed to be released	28,586	35,474
Total number of ESOP allocated and committed-to-be-released	94,894	69,306
Number of non committed, unearned ESOP shares	584,594	613,194
Total number of ESOP shares	679,488	682,500
Fair value of ESOP allocated shares	$ 443,601	$ 189,798
Fair value of ESOP Committed-to-be released shares	191,242	199,007
Total fair value of ESOP allocated and committed-to-be-released	634,843	388,805
Fair value of ESOP unallocated shares	3,910,932	3,440,020
Total fair value of ESOP shares	$ 4,545,775	$ 3,828,825

Employee stock ownership plan ESOP allocated shares and committed to be released fair value.

No definition available.

Name:	soho_EmployeeStockOwnershipPlanESOPAllocatedSharesAndCommittedToBeReleasedFairValue
Namespace Prefix:	soho_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Employee stock ownership plan esop allocated shares fair value.

+ References

No definition available.

+ Details

Name:	soho_EmployeeStockOwnershipPlanESOPAllocatedSharesFairValue
Namespace Prefix:	soho_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Employee stock ownership plan esop number of allocated shares and committed to be released shares.

+ References

No definition available.

+ Details

Name:	soho_EmployeeStockOwnershipPlanESOPNumberOfAllocatedSharesAndCommittedToBeReleasedShares
Namespace Prefix:	soho_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

Employee stock ownership plan ESOP shares committed to be released fair value

+ References

No definition available.

+ Details

Name:	soho_EmployeeStockOwnershipPlanESOPSharesCommittedToBeReleasedFairValue
Namespace Prefix:	soho_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Employee stock ownership plan ESOP shares fair value.

+ References

No definition available.

+ Details

Name:	soho_EmployeeStockOwnershipPlanESOPSharesFairValue
Namespace Prefix:	soho_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- References

No definition available.

+ Details

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

- Definition

Fair value of unearned shares held by the employee stock ownership plan (ESOP).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 40
-Section 50
-Paragraph 1
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=109244661&loc=d3e17540-113929

+ Details

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

- Definition

The shares or units in an ESOP trust that have been assigned to individual participant accounts based on a known formula. IRS rules require allocations to be nondiscriminatory generally based on compensation, length of service, or a combination of both. For any particular participant such shares or units may be vested, unvested, or partially vested.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 40
-Section 50
-Paragraph 1
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=109244661&loc=d3e17540-113929

+ Details

Name:	us-gaap_EmployeeStockOwnershipPlanESOPNumberOfAllocatedShares
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

The shares that, although not legally released, will be released by a future scheduled and committed debt service payment and will be allocated to employees for service rendered in the current accounting period. The ESOP documents typically define the period of service to which the shares relate. ESOP shares are released to compensate employees directly, to settle employer liabilities for other employee benefits, and to replace dividends on allocated shares that are used for debt service.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 40
-Section 50
-Paragraph 1
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=109244661&loc=d3e17540-113929

+ Details

Name:	us-gaap_EmployeeStockOwnershipPlanESOPNumberOfCommittedToBeReleasedShares
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

Shares contributed to the ESOP that have not yet been released, committed to be released, or allocated to participant accounts. Suspense shares generally collateralize ESOP debt.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 40
-Section 50
-Paragraph 1
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=109244661&loc=d3e17540-113929

+ Details

Name:	us-gaap_EmployeeStockOwnershipPlanESOPNumberOfSuspenseShares
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

Sum of the allocated, committed-to-be-released and suspense shares of the entity held by the plan.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 40
-Section 50
-Paragraph 1
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=109244661&loc=d3e17540-113929

+ Details

Name:	us-gaap_EmployeeStockOwnershipPlanESOPSharesInESOP
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant