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Benefit Plans - Post-retirement (Details)
 12 Months Ended 24 Months Ended
Jun. 30, 2023
USD ($)
Office
Jun. 30, 2022
USD ($)
Jun. 30, 2023
USD ($)
Office
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block      
Cash surrender value of bank owned life insurance $ 8,400,000 $ 8,200,000 $ 8,400,000
Bank owned life insurance, non-taxable income $ 186,000 188,000  
Executive Officer [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block      
Number of executive officers | Office 1   1
Post-retirement compensation liability $ 5,700,000 6,800,000 $ 5,700,000
Post-retirement compensation expense   217,000  
Post-retirement recovery (1,100,000)    
401(k) defined contribution plan [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block      
Employer matching contributions (percent)     3.00%
Employee contributions, immediate vesting (percent)     100.00%
Vesting term for employer matching contributions     6 years
401(k) defined contribution expense $ 306,000 $ 297,000