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Loans and Allowance for Credit Losses - Risk characteristics applicable to each class of the loan portfolio (Details) - USD ($) $ in Thousands |  | 12 Months Ended
--- | --- | ---
Jan. 20, 2023 | Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total loans (before deferred loan fees, net) |  | $ 4,100,768 | $ 3,850,035 |
Allowance for credit losses, loans |  | 5,847 | 6,625 | $ 14,131
Provision (recovery) for off balance sheet credit exposure |  | 676 | (3,025) | 2,930
Allowance for credit loss of individually evaluated loans |  | 8,200 | 10,900 |
Allowance for credit loss of Non-individually evaluated loans |  | $ 43,400 | 41,600 |
Citizens Bancshares Company |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for credit losses for purchased credit deteriorated (PCD) | $ 1,121 |  |  |
Commercial and industrial |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Amortization period of loans |  | 5 years |  |
Total loans (before deferred loan fees, net) |  | $ 510,259 | 450,147 |
Allowance for credit losses, loans |  | 2,160 | 1,356 | 1,492
Provision (recovery) for off balance sheet credit exposure |  | 292 | 52 | 310
Agriculture production |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total loans (before deferred loan fees, net) |  | 206,128 | 175,968 |
Allowance for credit losses, loans |  | 3,589 | 53 | (11)
Provision (recovery) for off balance sheet credit exposure |  | (37) | (70) | (111)
Consumer |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total loans (before deferred loan fees, net) |  | 55,387 | 59,671 |
Allowance for credit losses, loans |  | 698 | 400 | 302
Provision (recovery) for off balance sheet credit exposure |  | $ (12) | (4) | 14
Consumer | Automobile loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Maximum percentage of appraised value or purchase price that loans cannot exceed |  | 100.00% |  |
Amortization period of loans |  | 66 months |  |
Consumer | Maximum |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Amortization period of loans |  | 66 months |  |
All other loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total loans (before deferred loan fees, net) |  | $ 5,102 | 3,981 |
Allowance for credit losses, loans |  | (13) | (4) | 7
Provision (recovery) for off balance sheet credit exposure |  | 8 | (10) | 10
Secured by real estate |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total loans (before deferred loan fees, net) |  | $ 3,323,892 | 3,160,268 |
Secured by real estate | 1-4 residential real estate |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Maximum percentage of appraised value or purchase price that loans cannot exceed |  | 90.00% |  |
Total loans (before deferred loan fees, net) |  | $ 992,445 | 925,397 |
Allowance for credit losses, loans |  | (211) | 1,067 | 2,044
Provision (recovery) for off balance sheet credit exposure |  | $ 62 | 14 | 19
Secured by real estate | 1-4 residential real estate | Home Equity Loan |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Percentage of appraised value or estimated value of property |  | 90.00% |  |
Term of loan |  | 10 years |  |
Secured by real estate | 1-4 residential real estate | Maximum |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Fixed-rate and adjustable-rate mortgage (ARM) loans amortization period (in years) |  | 30 years |  |
Secured by real estate | Commercial Real Estate | Non-owner occupied |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Maximum percentage of appraised value or purchase price that loans cannot exceed |  | 80.00% |  |
Total loans (before deferred loan fees, net) |  | $ 888,317 | 899,770 |
Term of variable interest applicability on loans |  | 7 years |  |
Allowance for credit losses, loans |  | $ (3,014) | 5,688 | 2,718
Provision (recovery) for off balance sheet credit exposure |  | $ (19) | (1) | (48)
Secured by real estate | Commercial Real Estate | Non-owner occupied | Maximum |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Amortization period of loans |  | 25 years |  |
Term of fixed interest applicability on loans |  | 10 years |  |
Secured by real estate | Commercial Real Estate | Owner occupied |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total loans (before deferred loan fees, net) |  | $ 442,984 | 427,476 |
Allowance for credit losses, loans |  | (172) | (353) | 2,274
Provision (recovery) for off balance sheet credit exposure |  | $ 25 | (46) | 104
Secured by real estate | Multi-family real estate |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Maximum percentage of appraised value or purchase price that loans cannot exceed |  | 85.00% |  |
Total loans (before deferred loan fees, net) |  | $ 422,758 | 384,564 |
Allowance for credit losses, loans |  | (1,165) | (880) | 4,749
Provision (recovery) for off balance sheet credit exposure |  | $ (31) | 15 | 1
Secured by real estate | Multi-family real estate | Maximum |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Amortization period of loans |  | 25 years |  |
Amortization term of ballon maturity |  | 10 years |  |
Secured by real estate | Construction and land development |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Amortization period of loans |  | 25 years |  |
Total loans (before deferred loan fees, net) |  | $ 332,405 | 290,541 |
Incremental period that the loan maturity can be extended to |  | 3 months |  |
Allowance for credit losses, loans |  | $ 1,888 | (242) | 134
Provision (recovery) for off balance sheet credit exposure |  | $ 367 | (2,985) | 2,654
Secured by real estate | Construction and land development | Minimum |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Maturities of single-family residential construction loans |  | 6 months |  |
Maturities of multifamily or commercial construction loans |  | 12 months |  |
Secured by real estate | Construction and land development | Maximum |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Amortization period of loans |  | 30 years |  |
Maturities of single-family residential construction loans |  | 12 months |  |
Maturities of multifamily or commercial construction loans |  | 36 months |  |
Secured by real estate | Agriculture real estate |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Amortization period of loans |  | 1 year |  |
Total loans (before deferred loan fees, net) |  | $ 244,983 | 232,520 |
Agricultural real estate terms if 75% loan-to-value ratio |  | 30 years |  |
Allowance for credit losses, loans |  | $ 2,087 | (460) | 422
Provision (recovery) for off balance sheet credit exposure |  | $ 21 | $ 10 | $ (23)
Secured by real estate | Agriculture real estate | Scenario one |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loan to value percentage |  | 80.00% |  |
Secured by real estate | Agriculture real estate | Scenario two |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loan to value percentage |  | 75.00% |  |
Secured by real estate | Agriculture real estate | Maximum |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Agricultural real estate terms if 80% loan-to-value ratio |  | 25 years |  |

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