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Loans and Allowance for Credit Losses - Classes of loans information (Details) | 12 Months Ended
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Jun. 30, 2022 USD ($) loan | Jun. 30, 2021 USD ($) loan | Jun. 30, 2020 USD ($)
Provision for credit losses, credit (charges) | $ 1,500,000 | $ 1,000,000.0 | $ 6,000,000.0
PCD, increase in ALLL | 120,000 |  |
PCD loans receivable, net of ACL | 14,935,000 |  |
ACL required for non-PCD loans acquired | 1,900,000 |  |
Credit exposure | 120,000 |  |
Negative PCL | 533,000 |  |
ACL | 33,200,000 |  |
Secured by properties located outside lending area |  |  |
Loans Receivable | $ 459,900,000 |  |
Residential Real Estate. |  |  |
Fixed-rate and adjustable-rate mortgage (ARM) loans amortization period (in years) | 30 years |  |
Residential Real Estate. | Single Family |  |  |
Maximum percentage of appraised value or purchase price that loans cannot exceed | 90.00% |  |
Residential Real Estate. | Multifamily |  |  |
Maximum percentage of appraised value or purchase price that loans cannot exceed | 85.00% |  |
Amortization period of loans | 25 years |  |
Amortization period of multi-family residential loans if balloon maturities | 10 years |  |
Commercial |  |  |
Amortization period of loans | 25 years |  |
Term of fixed interest applicability on loans | 10 years |  |
Term of variable interest applicability on loans | 7 years |  |
Agricultural real estate terms if 80% loan-to-value ratio | 25 years |  |
Agricultural real estate terms if 75% loan-to-value ratio | 30 years |  |
Loans Receivable | $ 1,100,000,000 |  |
Residential Real Estate |  |  |
Amortization period of loans | 30 years |  |
Residential Real Estate | Minimum |  |  |
Maturities of single-family residential construction loans | 6 months |  |
Residential Real Estate | Maximum |  |  |
Maturities of single-family residential construction loans | 12 months |  |
Commercial Real Estate |  |  |
Amortization period of loans | 25 years |  |
Construction Real Estate |  |  |
Average term of construction loans | 12 months |  |
Construction Real Estate | Minimum |  |  |
Maturities of multifamily or commercial construction loans | 12 months |  |
Construction Real Estate | Maximum |  |  |
Maturities of multifamily or commercial construction loans | 36 months |  |
Consumer loans |  |  |
Amortization period of loans | 66 months |  |
Consumer loans | Home Equity Loan |  |  |
Maximum percentage of appraised value or purchase price that loans cannot exceed | 100.00% |  |
Amortization period of loans | 10 years |  |
Consumer loans | Automobile loans |  |  |
Maximum percentage of appraised value or purchase price that loans cannot exceed | 100.00% |  |
Amortization period of loans | 66 months |  |
Commercial loans |  |  |
Amortization period of loans | 5 years |  |
Amortization period of multi-family residential loans if balloon maturities | 1 year |  |
Modifications for the purpose of extending the maturity date | Construction Real Estate |  |  |
Incremental period that the loan maturity can be extended to | 3 months |  |
Number of construction loans outstanding, for which a modification had been agreed to | loan | 57 | 48 |
Construction loans outstanding, for which a modification had been agreed to | $ 13,800,000 | $ 28,500,000 |

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