Investment Securities (Details) $ in Thousands	3 Months Ended
Sep. 30, 2022 USD ($) item security	Sep. 30, 2021 USD ($)	Jun. 30, 2022 USD ($) item
Variable Interest Entity [Line Items]
Gross realized gains		$ 62
Proceeds from sale of securities	$ 0	5,008
Number of securities temporarily impaired \| item	122		115
Number of equity securities \| security	1
Equity securities	$ 1,985		$ 2,258
Unrealized (loss) gain on equity securities	$ (273)	$ 105
Financial Instrument, Owned, Pledged Status	Asset Pledged as Collateral without Right [Member]		Asset Pledged as Collateral without Right [Member]
Asset Pledged as Collateral
Variable Interest Entity [Line Items]
Pledged investment securities	$ 1,800		$ 2,000
Asset Pledged as Collateral without Right [Member]
Variable Interest Entity [Line Items]
Financial Instrument, Owned, Pledging Purpose	wmpn:MunicipalDeposits		wmpn:MunicipalDeposits

Number of investments in debt securities measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for 12 months or longer, without an allowance for credit loss. Includes beneficial interest in securitized financial asset.

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