INVESTMENT SECURITIES (Fair Value to Amortized Cost Basis) (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Debt and Equity Securities, FV-NI [Line Items]
Amortized Cost	$ 523,882	$ 500,478
Gross Unrealized Gains	129	3,390
Gross Unrealized Losses	59,509	6,029
Estimated Fair Value	464,502	497,839
CRA investment fund	4,254	4,772
Other equity securities	207	207
Total Investment Securities, Amortized Cost	528,343	505,457
Total Investment Securities, Gross Unrealized Gains	129	3,390
Total Investment Securities, Gross Unrealized Losses	59,509	6,029
Total Investment Securities, Estimated Fair Value	468,963	502,818
Residential Mortgage Backed Securities ("MBS")
Debt and Equity Securities, FV-NI [Line Items]
Amortized Cost	128,493	121,125
Gross Unrealized Gains	13	1,057
Gross Unrealized Losses	13,770	2,266
Estimated Fair Value	114,736	119,916
Residential Collateralized Mortgage Obligations ("CMOs")
Debt and Equity Securities, FV-NI [Line Items]
Amortized Cost	181,433	198,780
Gross Unrealized Gains	13	710
Gross Unrealized Losses	16,579	2,367
Estimated Fair Value	164,867	197,123
U.S. Agency
Debt and Equity Securities, FV-NI [Line Items]
Amortized Cost	14,601	14,433
Gross Unrealized Gains	0	11
Gross Unrealized Losses	2,375	140
Estimated Fair Value	12,226	14,304
Residential CMOs
Debt and Equity Securities, FV-NI [Line Items]
Amortized Cost	9,363	220
Gross Unrealized Gains	0	5
Gross Unrealized Losses	260	4
Estimated Fair Value	9,103	221
Student Loan Trust ABSs
Debt and Equity Securities, FV-NI [Line Items]
Amortized Cost	50,315	56,422
Gross Unrealized Gains	103	438
Gross Unrealized Losses	1,879	286
Estimated Fair Value	48,539	56,574
Municipal bonds
Debt and Equity Securities, FV-NI [Line Items]
Amortized Cost	99,846	92,556
Gross Unrealized Gains	0	1,169
Gross Unrealized Losses	20,982	884
Estimated Fair Value	78,864	92,841
Corporate bonds
Debt and Equity Securities, FV-NI [Line Items]
Amortized Cost	3,000
Gross Unrealized Gains	0
Gross Unrealized Losses	391
Estimated Fair Value	2,609
U.S. government obligations
Debt and Equity Securities, FV-NI [Line Items]
Amortized Cost	36,831	16,942
Gross Unrealized Gains	0	0
Gross Unrealized Losses	3,273	82
Estimated Fair Value	33,558	16,860
CRA investment fund
Debt and Equity Securities, FV-NI [Line Items]
CRA investment fund	4,254	4,772
Other equity securities
Debt and Equity Securities, FV-NI [Line Items]
Other equity securities	$ 207	$ 207

Debt Securities, Trading, And Equity Securities, Accumulated Gross Unrealized Gain, before Tax

No definition available.

Name:	tcfc_DebtSecuritiesTradingAndEquitySecuritiesAccumulatedGrossUnrealizedGainBeforeTax
Namespace Prefix:	tcfc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Debt Securities, Trading, And Equity Securities, Accumulated Gross Unrealized Loss, before Tax

+ References

No definition available.

+ Details

Name:	tcfc_DebtSecuritiesTradingAndEquitySecuritiesAccumulatedGrossUnrealizedLossBeforeTax
Namespace Prefix:	tcfc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Equity Securities Carried At Fair Value Through Income, Estimated Fair Value

+ References

No definition available.

+ Details

Name:	tcfc_EquitySecuritiesCarriedAtFairValueThroughIncomeEstimatedFairValue
Namespace Prefix:	tcfc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Non-Marketable Equity Securities Held In Other Financial Institutions

+ References

No definition available.

+ Details

Name:	tcfc_NonMarketableEquitySecuritiesHeldInOtherFinancialInstitutions
Namespace Prefix:	tcfc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ 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 https://asc.fasb.org/extlink&oid=126970911&loc=d3e27161-111563

+ Details

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

- Definition

Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ 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 https://asc.fasb.org/extlink&oid=126970911&loc=d3e27161-111563

+ Details

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

- Definition

Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27161-111563

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 30
-Section 45
-Paragraph 1
-URI https://asc.fasb.org/extlink&oid=124258926&loc=SL82898722-210454

+ Details

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

- Definition

Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(6))
-URI https://asc.fasb.org/extlink&oid=126897435&loc=d3e534808-122878

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 30
-Section 45
-Paragraph 1
-URI https://asc.fasb.org/extlink&oid=124258926&loc=SL82898722-210454

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 1
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=124260329&loc=d3e26610-111562

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (aa)
-URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27161-111563

+ Details

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

- Definition

Cost of investment in debt investment in debt security measured at fair value with change in fair value recognized in net income (trading) and investment in equity security with change in fair value recognized in net income (FV-NI). Excludes equity method investment and investment in equity security without readily determinable fair value.

+ References

No definition available.

+ Details

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

- Definition

Amount of investment in debt security measured at fair value with change in fair value recognized in net income (trading) and investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.4)
-URI https://asc.fasb.org/extlink&oid=126897435&loc=d3e534808-122878

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section 45
-Paragraph 1
-Subparagraph (f)
-URI https://asc.fasb.org/extlink&oid=124098289&loc=d3e6676-107765

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(2))
-URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

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

- Details

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

- Details

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

- Details

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

- Details

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

- Details

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

- Details

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

- Details

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

- Details

Name:	us-gaap_FinancialInstrumentAxis=tcfc_U.S.GovernmentObligationsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

- Details

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