Investment Securities (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
Mar. 31, 2021	Dec. 31, 2020
Marketable Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	$ 399,360	$ 345,580
Available-for-sale Securities, Gross Unrealized Gain	10,193	14,554
Available-for-sale Securities, Gross Unrealized Loss	3,705	268
Available-for-sale Securities	405,848	359,866
US Treasury Securities [Member]
Marketable Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	15,715	1,501
Available-for-sale Securities, Gross Unrealized Gain		1
Available-for-sale Securities, Gross Unrealized Loss	704	0
Available-for-sale Securities	15,011	1,502
US Government-sponsored Enterprises Debt Securities [Member]
Marketable Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	999	996
Available-for-sale Securities, Gross Unrealized Gain	3	10
Available-for-sale Securities, Gross Unrealized Loss	0	0
Available-for-sale Securities	1,002	1,006
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Marketable Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	257,874	222,739
Available-for-sale Securities, Gross Unrealized Gain	4,899	7,375
Available-for-sale Securities, Gross Unrealized Loss	1,867	185
Available-for-sale Securities	260,906	229,929
Small Business Administration pools [Member]
Marketable Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	37,115	34,577
Available-for-sale Securities, Gross Unrealized Gain	685	928
Available-for-sale Securities, Gross Unrealized Loss	18	7
Available-for-sale Securities	37,782	35,498
US States and Political Subdivisions Debt Securities [Member]
Marketable Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	84,383	82,495
Available-for-sale Securities, Gross Unrealized Gain	4,554	6,184
Available-for-sale Securities, Gross Unrealized Loss	1,116	76
Available-for-sale Securities	87,821	88,603
Corporate and other securities [Member]
Marketable Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	3,274	3,272
Available-for-sale Securities, Gross Unrealized Gain	52	56
Available-for-sale Securities, Gross Unrealized Loss	0	0
Available-for-sale Securities	$ 3,326	$ 3,328

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

No definition available.

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

- Definition

This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

+ References

No definition available.

+ Details

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

- Definition

Amount of unrealized gain before deducting unrealized loss on investments in debt and equity securities classified as available-for-sale securities.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27161-111563

+ Details

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

- Definition

Amount of unrealized loss before deducting unrealized gain on investments in available-for-sale securities.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27161-111563

+ Details

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

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

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_USTreasurySecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancialInstrumentAxis=fcco_SmallBusinessAdministrationSecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_USStatesAndPoliticalSubdivisionsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancialInstrumentAxis=fcco_CorporateAndOtherDebtSecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: