Regulatory Capital (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Regulatory Assets
Goodwill	$ (10,835)	$ (10,835)
Core deposit intangible (net of deferred tax liability)	(1,339)	(1,534)
AOCI (gains) losses	(4,517)	(1,504)
Common Equity Tier 1 Capital	172,751	167,621
TRUPs	12,000	12,000
Tier 1 Capital	184,751	179,621
Allowable reserve for credit losses and other Tier 2 adjustments	16,370	10,993
Subordinated notes	0	23,000
Tier 2 Capital	201,121	213,614
Risk-Weighted Assets ("RWA")	1,553,884	1,508,352
Average Assets ("AA")	$ 1,892,097	$ 1,782,834
Common Tier 1 capital to RWA, 2019 Regulatory Min. Ratio + CCB	7.00%
Tier 1 capital to RWA, 2019 Regulatory Min. Ratio + CCB	8.50%
Tier 2 capital to RWA, 2019 Regulatory Min. Ratio + CCB	10.50%
Common Tier 1 Capital to RWA	11.12%	11.11%
Tier 1 Capital to RWA	11.89%	11.91%
Tier 2 Capital to RWA	12.94%	14.16%
Tier 1 Capital to AA (Leverage)	9.76%	10.08%
PCA well capitalized, percent	5.00%
Common Stock
Regulatory Assets
Common equity	$ 189,442	$ 181,494
Bank
Regulatory Assets
Goodwill	(10,835)	(10,835)
Core deposit intangible (net of deferred tax liability)	(1,339)	(1,534)
AOCI (gains) losses	(4,517)	(1,504)
Common Equity Tier 1 Capital	181,409	188,731
Tier 1 Capital	181,409	188,731
Allowable reserve for credit losses and other Tier 2 adjustments	16,370	10,993
Tier 2 Capital	197,779	199,724
Risk-Weighted Assets ("RWA")	1,551,903	1,506,766
Average Assets ("AA")	$ 1,890,542	$ 1,781,415
Common Tier 1 Capital to RWA	11.69%	12.53%
Tier 1 Capital to RWA	11.69%	12.53%
Tier 2 Capital to RWA	12.74%	13.26%
Tier 1 Capital to AA (Leverage)	9.60%	10.59%
Bank \| Common Stock
Regulatory Assets
Common equity	$ 198,100	$ 202,604

Allowable reserve for credit losses, other, including unrealized gains on AFS securities includible in Tier 2 Capital

No definition available.

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

- Definition

Common Equity Tier 1 Capital

+ References

No definition available.

+ Details

Name:	tcfc_CommonEquityTier1Capital
Namespace Prefix:	tcfc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Common Tier 1 Capital to Risk Weighted Assets

+ References

No definition available.

+ Details

Name:	tcfc_CommonTier1CapitalToRiskWeightedAssets
Namespace Prefix:	tcfc_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Common Tier1 Capital To Risk Weighted Assets 2019 Regulatory Minimum Ration Plus Capital Conservation Buffer

+ References

No definition available.

+ Details

Name:	tcfc_CommonTier1CapitalToRiskWeightedAssets2019RegulatoryMinimumRationPlusCapitalConservationBuffer
Namespace Prefix:	tcfc_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Core Deposit Intangible, Net Of Deferred Tax Liability

+ References

No definition available.

+ Details

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

- Definition

Stockholders Equity Excluding Preferred Stock

+ References

No definition available.

+ Details

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

- Definition

Tier 2 Capital to Risk Weighted Assets

+ References

No definition available.

+ Details

Name:	tcfc_Tier2CapitalToRiskWeightedAssets
Namespace Prefix:	tcfc_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Tier One Risk Based Capital To Risk Weighted Assets 2019 Regulatory Minimum Ration Plus Capital Conservation Buffer

+ References

No definition available.

+ Details

Name:	tcfc_TierOneRiskBasedCapitalToRiskWeightedAssets2019RegulatoryMinimumRationPlusCapitalConservationBuffer
Namespace Prefix:	tcfc_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Tier Two Risk Based Capital To Risk Weighted Assets 2019 Regulatory Minimum Ration Plus Capital Conservation Buffer

+ References

No definition available.

+ Details

Name:	tcfc_TierTwoRiskBasedCapitalToRiskWeightedAssets2019RegulatoryMinimumRationPlusCapitalConservationBuffer
Namespace Prefix:	tcfc_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=118930883&loc=d3e637-108580

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 14A
-URI http://asc.fasb.org/extlink&oid=118930883&loc=SL7669686-108580

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 14
-URI http://asc.fasb.org/extlink&oid=118930883&loc=d3e681-108580

+ Details

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

- Definition

The amount of total capital as defined in the regulations.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 948
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=6490092&loc=d3e47304-110998

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 505
-Section 50
-Paragraph 1H
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=117337116&loc=d3e65071-112826

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 948
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=6490092&loc=d3e47080-110998

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 505
-Section 50
-Paragraph 1H
-Subparagraph (c)(2)
-URI http://asc.fasb.org/extlink&oid=117337116&loc=d3e65071-112826

+ Details

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

- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13770-109266

+ Details

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

- Definition

Including the current and noncurrent portions, carrying value as of the balance sheet date of long-term debt (with maturities initially due after one year or beyond the operating cycle if longer) identified as Junior Subordinated Notes, which have a lower priority than senior instruments.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(16)(a))
-URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 3: 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(16))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

+ Details

Name:	us-gaap_JuniorSubordinatedNotes
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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_RegulatoryAssetLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of risk-weighted assets as calculated in accordance with U.S. Federal regulatory capital standards.

+ References

No definition available.

+ Details

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

- Definition

Including the current and noncurrent portions, carrying value as of the balance sheet date of subordinated debt (with initial maturities beyond one year or beyond the operating cycle if longer). Subordinated debt places a lender in a lien position behind debt having a higher priority of repayment in liquidation of the entity's assets.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(19))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: 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(16))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(16))
-URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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

- Definition

The amount of Tier 1 Leverage Capital required to be categorized as well capitalized divided by average assets as defined in the regulatory framework for prompt corrective action.

+ References

+ Details

Name:	us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalizedToAverageAssets
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Tier 1 Leverage Capital divided by average assets as defined in the regulations.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 505
-Section 50
-Paragraph 1
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=117337116&loc=SL5958568-112826

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 505
-Section 50
-Paragraph 1H
-Subparagraph (c)(2)
-URI http://asc.fasb.org/extlink&oid=117337116&loc=d3e65071-112826

+ Details

Name:	us-gaap_TierOneLeverageCapitalToAverageAssets
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Tier 1 Risk Based Capital as defined in the regulations.

+ References

+ Details

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

- Definition

Tier 1 capital divided by risk weighted assets as defined by regulations.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 505
-Section 50
-Paragraph 1H
-Subparagraph (c)(2)
-URI http://asc.fasb.org/extlink&oid=117337116&loc=d3e65071-112826

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 505
-Section 50
-Paragraph 1
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=117337116&loc=SL5958568-112826

+ Details

Name:	us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Tier 2 risk-based capital as defined in the regulations.

+ References

No definition available.

+ Details

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

- Details

Name:	us-gaap_StatementEquityComponentsAxis=us-gaap_CommonStockMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_ConsolidatedEntitiesAxis=tcfc_BankMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: