LOANS - Impaired Loans (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
With no related allowance recorded:
Recorded Investment	$ 15,322	$ 9,096	$ 7,718
Unpaid Principal Balance	15,029		7,718
Average Recorded Investment	15,152	8,231	8,179
Interest Income Recognized	417	409
With an allowance recorded:
Recorded Investment	2,445	11,539	6,380
Unpaid Principal Balance	2,516		6,451
Related Allowance	676		2,066
Average Recorded Investment	2,484	12,007	6,731
Interest Income Recognized	44	173
Total impaired loans
Recorded Investment	17,767	20,635	14,098
Unpaid Principal Balance	17,545		14,169
Average Recorded Investment	17,636	20,238	14,910
Interest Income Recognized	461	582
Real estate mortgages \| Construction and development
With no related allowance recorded:
Recorded Investment	5,049	1,490	977
Unpaid Principal Balance	5,049		977
Average Recorded Investment	5,063	1,506	970
Interest Income Recognized	113	78
With an allowance recorded:
Recorded Investment	1,376	1,234	644
Unpaid Principal Balance	1,376		644
Related Allowance	131		106
Average Recorded Investment	1,382	1,258	668
Interest Income Recognized	14	37
Real estate mortgages \| Residential
With no related allowance recorded:
Recorded Investment	1,236	2,345	1,537
Unpaid Principal Balance	1,236		1,537
Average Recorded Investment	1,694	1,759	1,669
Interest Income Recognized	59	95
With an allowance recorded:
Recorded Investment	478	552	1,557
Unpaid Principal Balance	549		1,628
Related Allowance	125		628
Average Recorded Investment	490	560	1,636
Interest Income Recognized	12	20
Real estate mortgages \| Commercial
With no related allowance recorded:
Recorded Investment	8,987	4,915	5,117
Unpaid Principal Balance	8,694		5,117
Average Recorded Investment	8,328	4,619	5,425
Interest Income Recognized	242	202
With an allowance recorded:
Recorded Investment	279	9,283	3,373
Unpaid Principal Balance	279		3,373
Related Allowance	109		847
Average Recorded Investment	280	9,706	3,526
Interest Income Recognized	7	100
Commercial and industrial
With no related allowance recorded:
Recorded Investment	32	340	65
Unpaid Principal Balance	32		65
Average Recorded Investment	45	340	91
Interest Income Recognized	2	34
With an allowance recorded:
Recorded Investment	300	470	791
Unpaid Principal Balance	300		791
Related Allowance	307		478
Average Recorded Investment	319	483	886
Interest Income Recognized	11	16
Consumer and other
With no related allowance recorded:
Recorded Investment	18	6	22
Unpaid Principal Balance	18		22
Average Recorded Investment	22	7	24
Interest Income Recognized	1	0
With an allowance recorded:
Recorded Investment	12	0	15
Unpaid Principal Balance	12		15
Related Allowance	4		7
Average Recorded Investment	13	0	$ 15
Interest Income Recognized	$ 0	$ 0

Impaired Financing Receivable

No definition available.

Name:	ssbk_ImpairedFinancingReceivableAbstract
Namespace Prefix:	ssbk_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Impaired Financing Receivable, Interest Income, Cash Basis and Accrual Method

+ References

No definition available.

+ Details

Name:	ssbk_ImpairedFinancingReceivableInterestIncomeCashBasisAndAccrualMethod
Namespace Prefix:	ssbk_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Impaired Financing Receivable, With No Related Allowance

+ References

No definition available.

+ Details

Name:	ssbk_ImpairedFinancingReceivableWithNoRelatedAllowanceAbstract
Namespace Prefix:	ssbk_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis and Accrual Method

+ References

No definition available.

+ Details

Name:	ssbk_ImpairedFinancingReceivableWithNoRelatedAllowanceInterestIncomeCashBasisAndAccrualMethod
Namespace Prefix:	ssbk_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Impaired Financing Receivable, With Related Allowance

+ References

No definition available.

+ Details

Name:	ssbk_ImpairedFinancingReceivableWithRelatedAllowanceAbstract
Namespace Prefix:	ssbk_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis and Accrual Method

+ References

No definition available.

+ Details

Name:	ssbk_ImpairedFinancingReceivableWithRelatedAllowanceInterestIncomeCashBasisAndAccrualMethod
Namespace Prefix:	ssbk_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Average amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=123577603&loc=d3e5212-111524

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 17
-URI http://asc.fasb.org/extlink&oid=123577603&loc=d3e5258-111524

+ Details

Name:	us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 14A
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=123577603&loc=SL6953550-111524

+ Details

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

- Definition

Amount of allowance for credit losses related to recorded investment.

+ References

+ Details

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

- Definition

Amount of unpaid principal balance of impaired financing receivables with related allowance for credit losses and without related allowance for credit losses.

+ References

+ Details

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

- Definition

Amount of average investment of impaired financing receivables for which there is no related allowance for credit losses.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 17
-URI http://asc.fasb.org/extlink&oid=123577603&loc=d3e5258-111524

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=123577603&loc=d3e5212-111524

+ Details

Name:	us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceAverageRecordedInvestment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of investment in impaired financing receivables for which there is no related allowance for credit losses.

+ References

+ Details

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

- Definition

Amount of unpaid principal balance of impaired financing receivables for which there is no related allowance for credit losses.

+ References

+ Details

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

- Definition

Amount of average investment of impaired financing receivables for which there is a related allowance for credit losses.

+ References

+ Details

Name:	us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceAverageRecordedInvestment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of investment in impaired financing receivables for which there is a related allowance for credit losses.

+ References

+ Details

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

- Definition

Unpaid principal balance of impaired financing receivables for which there is a related allowance for credit losses.

+ References

+ Details

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

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=ssbk_RealEstatePortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_ConstructionLoansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_ResidentialMortgageMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_CommercialLoanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_CommercialPortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_ConsumerPortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: