Investment Securities (Details) $ in Thousands	12 Months Ended
	Jun. 30, 2023 USD ($) security	Jun. 30, 2022 USD ($) security
Variable Interest Entity [Line Items]
Gross realized gains		$ 62
Proceeds from sale of securities	$ 0	$ 5,008
Number of securities temporarily impaired | security	126	115
Number of equity securities | security	1	1
Equity securities	$ 1,629	$ 2,258
Unrealized loss on equity securities	$ 629	$ 242
Financial Instrument, Owned, Pledged Status	Asset Pledged as Collateral without Right [Member]	Asset Pledged as Collateral without Right [Member]
Asset Pledged as Collateral without Right [Member]
Variable Interest Entity [Line Items]
Pledged investment securities	$ 2,500	$ 2,000
Financial Instrument, Owned, Pledging Purpose	wmpn:MunicipalDeposits	wmpn:MunicipalDeposits