Loans and Allowance for Loan Losses - Summary of Troubled Debt Restructuring (Details)	6 Months Ended	12 Months Ended
Jun. 30, 2022 USD ($) Loan	Dec. 31, 2021 USD ($) Loan
Accounts Notes And Loans Receivable [Line Items]
Number of loans \| Loan	4	5
Pre- restructuring recorded investment	$ 1,636	$ 1,685
Post- restructuring recorded investment	1,636	1,685
Payment deferral	$ 1,636	$ 1,685
Real Estate \| Non-Farm Non-Residential Owner Occupied
Accounts Notes And Loans Receivable [Line Items]
Number of loans \| Loan	3	3
Pre- restructuring recorded investment	$ 851,000	$ 927
Post- restructuring recorded investment	851,000	927
Payment deferral	$ 851,000	$ 927
Commercial & Industrial
Accounts Notes And Loans Receivable [Line Items]
Number of loans \| Loan	1	2
Pre- restructuring recorded investment	$ 785,000	$ 758
Post- restructuring recorded investment	785,000	758
Payment deferral	$ 785,000	$ 758

Financing receivable modifications deferral payment.

No definition available.

Name:	tcbx_FinancingReceivableModificationsDeferralPayment
Namespace Prefix:	tcbx_
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_AccountsNotesAndLoansReceivableLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Number of financing receivables that have been modified by troubled debt restructurings.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=123577603&loc=SL6953676-111524

+ Details

Name:	us-gaap_FinancingReceivableModificationsNumberOfContracts2
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount, after troubled debt restructuring, of modified financing receivable.

+ References

+ Details

Name:	us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount, before troubled debt restructuring, of financing receivable to be modified.

+ References

+ Details

Name:	us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Details

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

- Details

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

- Details

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