Benefit Plans - Post-retirement (Details)	12 Months Ended
Jun. 30, 2021 USD ($) Office	Jun. 30, 2020 USD ($) Office
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block
Cash surrender value of bank owned life insurance	$ 8,000,000.0	$ 7,800,000
Bank owned life insurance, non-taxable income	$ 191,000	$ 189,000
Executive Officer [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block
Number of executive officers \| Office	2	2
Post-retirement compensation liability	$ 6,600,000	$ 6,100,000
Post-retirement compensation expense	$ 563,000	$ 427,000
401(k) defined contribution plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block
Employer matching contributions (percent)	3.00%	3.00%
Employee contributions, immediate vesting (percent)	100.00%	100.00%
Vesting term for employer matching contributions	6 years	6 years
401(k) defined contribution expense	$ 297,000	$ 327,000

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Earnings on or other increases in the value of the cash surrender value of bank owned life insurance policies.

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-Name Accounting Standards Codification
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Carrying amount as of the balance sheet date of amounts which could be received based on the terms of the insurance contract upon surrendering life policies owned by the entity.

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The compensation expense recognized during the period pertaining to the deferred compensation arrangement.

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The carrying amount of the liability as of the balance sheet date to an individual under a deferred compensation arrangement. This amount may be the result of periodic accruals made over the period of active employment, or reflect termination benefits resulting contractual terms or a death benefit.

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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.

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Amount of cost for defined contribution plan.

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Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan.

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