LOANS (Allowance for Credit Losses "ACL" on Financing Receivables) (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Allowance for credit losses:
Beginning Balance	$ 21,404	$ 18,464	$ 18,417	$ 19,424
Charge-offs	(92)	(491)	(539)	(2,037)
Recoveries	21	554	84	606
Provisions	694	0	1,569	534
Ending Balance	22,027	18,527	22,027	18,527
Cumulative Effect, Period of Adoption, Adjustment
Allowance for credit losses:
Beginning Balance			2,496
Commercial real estate
Allowance for credit losses:
Beginning Balance	16,833	13,918	13,095	13,744
Charge-offs	0	(491)	(280)	(1,739)
Recoveries	0	4	0	6
Provisions	203	(12)	487	1,408
Ending Balance	17,036	13,419	17,036	13,419
Commercial real estate \| Cumulative Effect, Period of Adoption, Adjustment
Allowance for credit losses:
Beginning Balance			3,734
Residential first mortgages
Allowance for credit losses:
Beginning Balance	255	847	1,002	1,305
Charge-offs	0	0	(111)	(142)
Recoveries	14	0	14	0
Provisions	(32)	65	11	(251)
Ending Balance	237	912	237	912
Residential first mortgages \| Cumulative Effect, Period of Adoption, Adjustment
Allowance for credit losses:
Beginning Balance			(679)
Residential rentals
Allowance for credit losses:
Beginning Balance	1,660	1,186	2,175	1,413
Charge-offs	0	0	0	(46)
Recoveries	0	0	0	0
Provisions	885	614	956	433
Ending Balance	2,545	1,800	2,545	1,800
Residential rentals \| Cumulative Effect, Period of Adoption, Adjustment
Allowance for credit losses:
Beginning Balance			(586)
Construction and land development
Allowance for credit losses:
Beginning Balance	166	332	260	401
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Provisions	31	36	19	(33)
Ending Balance	197	368	197	368
Construction and land development \| Cumulative Effect, Period of Adoption, Adjustment
Allowance for credit losses:
Beginning Balance			(82)
Home equity and second mortgages
Allowance for credit losses:
Beginning Balance	143	242	274	261
Charge-offs	0	0	0	0
Recoveries	0	1	1	4
Provisions	(1)	6	(47)	(16)
Ending Balance	142	249	142	249
Home equity and second mortgages \| Cumulative Effect, Period of Adoption, Adjustment
Allowance for credit losses:
Beginning Balance			(86)
Commercial loans
Allowance for credit losses:
Beginning Balance	238	1,113	582	1,222
Charge-offs	(49)	0	(99)	(76)
Recoveries	1	529	2	539
Provisions	64	(733)	59	(776)
Ending Balance	254	909	254	909
Commercial loans \| Cumulative Effect, Period of Adoption, Adjustment
Allowance for credit losses:
Beginning Balance			(290)
Consumer loans
Allowance for credit losses:
Beginning Balance	132	28	58	20
Charge-offs	(14)	0	(20)	0
Recoveries	0	0	0	0
Provisions	24	14	102	22
Ending Balance	142	42	142	42
Consumer loans \| Cumulative Effect, Period of Adoption, Adjustment
Allowance for credit losses:
Beginning Balance			2
Commercial equipment
Allowance for credit losses:
Beginning Balance	1,977	798	971	1,058
Charge-offs	(29)	0	(29)	(34)
Recoveries	6	20	67	57
Provisions	(480)	10	(18)	(253)
Ending Balance	$ 1,474	828	1,474	828
Commercial equipment \| Cumulative Effect, Period of Adoption, Adjustment
Allowance for credit losses:
Beginning Balance			$ 483
Purchased credit impaired
Allowance for credit losses:
Beginning Balance		52		0
Charge-offs		0		0
Recoveries		0		0
Provisions		0		52
Ending Balance		$ 52		$ 52

Amount excluding accrued interest, of allowance for credit loss on financing receivable. Excludes net investment in lease.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 45
-Paragraph 1
-URI https://asc.fasb.org/extlink&oid=124255206&loc=SL82895884-210446

+ Details

Name:	us-gaap_FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest
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 https://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 https://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 https://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 https://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 https://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 https://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

- References

No definition available.

+ Details

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

- Definition

Amount of expense related loan transactions, lease transactions, credit loss from transactions other than loan and lease transactions, and other loss based on assessment of uncollectability from the counterparty to reduce the account to their net realizable value.

+ 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 (c)(2)
-URI https://asc.fasb.org/extlink&oid=123577603&loc=SL6953423-111524

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 https://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 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3602-108585

+ Details

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

- Details

Name:	srt_CumulativeEffectPeriodOfAdoptionAxis=srt_CumulativeEffectPeriodOfAdoptionAdjustmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

- Details

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

- Details

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

- Details

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

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=tcfc_HomeEquityAndSecondMortgageLoansMember
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:

- Details

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

- Details

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