Loans (Details 2) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended	12 Months Ended
Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Financing Receivable, Past Due [Line Items]
Beginning balance December 31, 2019	$ 10,563	$ 7,694	$ 10,389	$ 6,627	$ 6,627
Charge-offs	(121)	(25)	(146)	(48)	(110)
Recoveries	28	17	50	32	209
Provisions	168	1,250	345	2,325	3,663
Ending balance December 31, 2020	10,638	8,936	10,638	8,936	10,389
Individually evaluated for impairment	2	4	2	4	2
Collectively evaluated for impairment	10,636	8,932	10,636	8,932	10,387
Loans held-for-investment	878,318	817,372	878,318	817,372	844,157
Individually evaluated for impairment	5,494	3,419	5,494	3,419	6,113
Collectively evaluated for impairment	872,824	813,953	872,824	813,953	838,044
Commercial, Financial And Agricultural Loan [Member]
Financing Receivable, Past Due [Line Items]
Beginning balance December 31, 2019	758	489	778	427	427
Charge-offs
Recoveries	2	3	3	3	130
Provisions	134	277	113	339	221
Ending balance December 31, 2020	894	769	894	769	778
Individually evaluated for impairment
Collectively evaluated for impairment	894	769	894	769	778
Loans held-for-investment	111,449	107,184	111,449	107,184	96,688
Individually evaluated for impairment
Collectively evaluated for impairment	111,449	107,184	111,449	107,184	96,688
Construction Loans [Member]
Financing Receivable, Past Due [Line Items]
Beginning balance December 31, 2019	134	148	145	111	111
Charge-offs					(2)
Recoveries					2
Provisions	(9)	17	(20)	54	34
Ending balance December 31, 2020	125	165	125	165	145
Individually evaluated for impairment
Collectively evaluated for impairment	125	165	125	165	145
Loans held-for-investment	95,865	82,584	95,865	82,584	95,282
Individually evaluated for impairment
Collectively evaluated for impairment	95,865	82,584	95,865	82,584	95,282
Residential Mortgage [Member]
Financing Receivable, Past Due [Line Items]
Beginning balance December 31, 2019	480	440	541	367	367
Charge-offs
Recoveries
Provisions	62	57	1	130	174
Ending balance December 31, 2020	542	497	542	497	541
Individually evaluated for impairment
Collectively evaluated for impairment	542	497	542	497	541
Loans held-for-investment	44,594	45,424	44,594	45,424	43,928
Individually evaluated for impairment	310	333	310	333	440
Collectively evaluated for impairment	44,284	45,091	44,284	45,091	43,488
Commercial Real Estate [Member]
Financing Receivable, Past Due [Line Items]
Beginning balance December 31, 2019	8,137	5,531	7,855	4,602	4,602
Charge-offs	(110)		(110)		(1)
Recoveries	7	3	11	9	23
Provisions	(8)	935	270	1,858	3,231
Ending balance December 31, 2020	8,026	6,469	8,026	6,469	7,855
Individually evaluated for impairment	2	4	2	4	2
Collectively evaluated for impairment	8,024	6,465	8,024	6,465	7,853
Loans held-for-investment	592,099	544,670	592,099	544,670	573,258
Individually evaluated for impairment	5,163	3,020	5,163	3,020	5,631
Collectively evaluated for impairment	586,936	541,650	586,936	541,650	567,627
Home Equity Line of Credit [Member]
Financing Receivable, Past Due [Line Items]
Beginning balance December 31, 2019	309	277	324	240	240
Charge-offs
Recoveries	5		6	1	2
Provisions	8	16	(8)	52	82
Ending balance December 31, 2020	322	293	322	293	324
Individually evaluated for impairment
Collectively evaluated for impairment	322	293	322	293	324
Loans held-for-investment	26,662	27,156	26,662	27,156	26,442
Individually evaluated for impairment	21	66	21	66	42
Collectively evaluated for impairment	26,641	27,090	26,641	27,090	26,400
Consumer Portfolio Segment [Member]
Financing Receivable, Past Due [Line Items]
Beginning balance December 31, 2019	124	112	125	97	97
Charge-offs	(11)	(25)	(36)	(48)	(107)
Recoveries	14	11	30	19	52
Provisions	(16)	34	(8)	64	83
Ending balance December 31, 2020	111	132	111	132	125
Individually evaluated for impairment
Collectively evaluated for impairment	111	132	111	132	125
Loans held-for-investment	7,649	10,354	7,649	10,354	8,559
Individually evaluated for impairment
Collectively evaluated for impairment	7,649	10,354	7,649	10,354	8,559
Unallocated Financing Receivables [Member]
Financing Receivable, Past Due [Line Items]
Beginning balance December 31, 2019	621	697	621	783	783
Charge-offs
Recoveries
Provisions	(3)	(86)	(3)	(172)	(162)
Ending balance December 31, 2020	618	611	618	611	621
Individually evaluated for impairment
Collectively evaluated for impairment	618	611	618	611	621
Loans held-for-investment
Individually evaluated for impairment
Collectively evaluated for impairment

The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=123577603&loc=SL6953423-111524

+ Details

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

- Definition

Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment.

+ References

+ Details

Name:	us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of increase in allowance for credit loss on financing receivable from recovery.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 55
-Paragraph 79
-URI http://asc.fasb.org/extlink&oid=124267575&loc=SL82922352-210448

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 13
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (c)(4)
-URI http://asc.fasb.org/extlink&oid=123577603&loc=SL6953423-111524

+ Details

Name:	us-gaap_FinancingReceivableAllowanceForCreditLossesRecovery
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of writeoff of financing receivable, charged against allowance for credit loss.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 13
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (c)(3)
-URI http://asc.fasb.org/extlink&oid=123577603&loc=SL6953423-111524

Reference 3: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 55
-Paragraph 79
-URI http://asc.fasb.org/extlink&oid=124267575&loc=SL82922352-210448

+ Details

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

- Definition

The balance of financing receivables that were collectively evaluated for impairment.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (h)
-URI http://asc.fasb.org/extlink&oid=123577603&loc=SL6953423-111524

+ Details

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

- Definition

The balance of financing receivables that were individually evaluated for impairment.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (h)
-URI http://asc.fasb.org/extlink&oid=123577603&loc=SL6953423-111524

+ Details

Name:	us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment
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

No definition available.

+ Details

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

- Definition

Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section S99
-Paragraph 4
-Subparagraph (SAB Topic 6.L.1)
-URI http://asc.fasb.org/extlink&oid=122038336&loc=d3e74567-122707

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=123577603&loc=SL6953423-111524

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (b)(1)(ii)
-URI http://asc.fasb.org/extlink&oid=121614798&loc=d3e15032-111544

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=123577603&loc=SL6953423-111524

+ Details

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

- Definition

Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=124259787&loc=d3e4428-111522

+ Details

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

- Definition

Amount of expense related to estimated loss from loan and lease transactions.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 220
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04.11)
-URI http://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (c)(2)
-URI http://asc.fasb.org/extlink&oid=123577603&loc=SL6953423-111524

+ Details

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

- Details

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

- Details

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

- Details

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

- Details

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