Commitments and Credit Risk - Standby Letters of Credit: Letters of Credit (Details) - USD ($) $ in Millions	Jun. 30, 2020	Jun. 30, 2019
Commitments and Credit Risk
Letters of Credit Outstanding, Amount	$ 3.2	$ 2.6

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

No definition available.

Name:	us-gaap_LettersOfCreditOutstandingAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant