Nature of Operations and Summary of Significant Accounting Policies (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2025 USD ($) facility	Dec. 31, 2024 USD ($)	Oct. 17, 2023 USD ($)
Nature of Operations and Summary of Significant Accounting Policies
Deferred stock issuance costs			$ 1,600
Number of facilities | facility	2
Cash accounts in excess of federally insured limits	$ 3,760	$ 4,270
Accrued interest receivable on available-for-sale debt securities	355	378
Accrued interest receivable on held-to-maturity debt securities	$ 28	31
Forecast period	2 years
Loans outstanding	$ 99,576	96,274
Accrued interest on loans	329	324
Retained earnings	25,986	25,701
Deferred compensation liability	$ 400	$ 400
PFS Bancorp | Public Shareholders
Nature of Operations and Summary of Significant Accounting Policies
Ownership percentage			100.00%
Peru Federal Savings Bank
Nature of Operations and Summary of Significant Accounting Policies
Ownership percentage			100.00%
Buildings and improvements | Minimum
Nature of Operations and Summary of Significant Accounting Policies
Premises and equipment useful lives	5 years
Buildings and improvements | Maximum
Nature of Operations and Summary of Significant Accounting Policies
Premises and equipment useful lives	50 years
Equipment | Minimum
Nature of Operations and Summary of Significant Accounting Policies
Premises and equipment useful lives	3 years
Equipment | Maximum
Nature of Operations and Summary of Significant Accounting Policies
Premises and equipment useful lives	7 years