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Organization - Narrative (Details)	12 Months Ended
Organization - Narrative (Details)	Dec. 31, 2023 subsidiary
Organization
Number of inactive subsidiaries	1

X

- Definition

Represents the number of inactive subsidiaries.

+ References

No definition available.

+ Details

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Namespace Prefix:	tbnk_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

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