Government Assistance (Details) - TIF - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Government assistance
TIF receivable	$ 214	$ 214
Government Assistance, Asset, Statement of Financial Position [Extensible Enumeration]	Other Assets	Other Assets

Amount of asset from government assistance.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 832
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483507/832-10-50-3

+ Details

Name:	us-gaap_GovernmentAssistanceAmountCumulative
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

+ Details

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

- Definition

Indicates line item in statement of financial position that includes asset from government assistance.

+ References

+ Details

Name:	us-gaap_GovernmentAssistanceStatementOfFinancialPositionExtensibleEnumeration
Namespace Prefix:	us-gaap_
Data Type:	enum2:enumerationSetItemType
Balance Type:	na
Period Type:	instant

- Details

Name:	us-gaap_GovernmentAssistanceTypeAxis=pfsb_TaxIncrementalFinancingDistrictCityOfLasalleMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: