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Loans and Allowance for Credit Losses - Classes of loans information (Details) - USD ($) |  |  | 3 Months Ended |
--- | --- | --- | --- | ---
Jan. 20, 2023 | Feb. 25, 2022 | Sep. 30, 2024 | Sep. 30, 2023 | Jun. 30, 2024
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Total loans (before deferred loan fees, net) |  |  | $ 3,966,736,000 |  | $ 3,850,035,000
Provision for credit losses |  |  | 2,159,000 | $ 900,000 |
Allowance for credit losses, loans |  |  | 2,021,000 | 1,570,000 |
Provision (recovery) for off balance sheet credit exposure |  |  | $ 138,000 | $ (670,000) |
Net charge offs on average loans outstanding (as percentage) |  |  | 0.01% | 0.03% |
Citizens Bancshares Company |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Allowance for credit losses for purchased credit deteriorated (PCD) | $ 1,121,000 |  |  |  |
Fortune |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Allowance for credit losses for purchased credit deteriorated (PCD) |  | $ 120,000 |  |  |
Commercial and industrial |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Amortization period of loans |  |  | 5 years |  |
Total loans (before deferred loan fees, net) |  |  | $ 457,018,000 |  | 450,147,000
Allowance for credit losses, loans |  |  | (85,000) | $ (100,000) |
Provision (recovery) for off balance sheet credit exposure |  |  | 20,000 | 37,000 |
Agriculture production |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Total loans (before deferred loan fees, net) |  |  | 200,215,000 |  | 175,968,000
Allowance for credit losses, loans |  |  | (51,000) | (85,000) |
Provision (recovery) for off balance sheet credit exposure |  |  | (3,000) | (84,000) |
Consumer |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Total loans (before deferred loan fees, net) |  |  | 58,735,000 |  | 59,671,000
Allowance for credit losses, loans |  |  | $ 13,000 | 38,000 |
Provision (recovery) for off balance sheet credit exposure |  |  |  | 1,000 |
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 |  |
Consumer | Maximum | Home Equity Loan |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Amortization period of loans |  |  | 10 years |  |
All other loans |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Total loans (before deferred loan fees, net) |  |  | $ 3,699,000 |  | 3,981,000
Allowance for credit losses, loans |  |  | (3,000) | (5,000) |
Provision (recovery) for off balance sheet credit exposure |  |  |  | (3,000) |
Secured by real estate |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Total loans (before deferred loan fees, net) |  |  | $ 3,247,069,000 |  | 3,160,268,000
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) |  |  | $ 942,916,000 |  | 925,397,000
Allowance for credit losses, loans |  |  | 157,000 | (101,000) |
Provision (recovery) for off balance sheet credit exposure |  |  | $ 30,000 | 5,000 |
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 |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Total loans (before deferred loan fees, net) |  |  | $ 1,600,000,000 |  |
Secured by real estate | Commercial Real Estate | Secured by properties located outside lending area |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Total loans (before deferred loan fees, net) |  |  | $ 626,300,000 |  |
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) |  |  | $ 903,678,000 |  | 899,770,000
Term of variable interest applicability on loans |  |  | 7 years |  |
Allowance for credit losses, loans |  |  | $ 1,673,000 | 2,641,000 |
Provision (recovery) for off balance sheet credit exposure |  |  | $ 22,000 |  |
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) |  |  | $ 438,030,000 |  | 427,476,000
Allowance for credit losses, loans |  |  | (1,000) | (289,000) |
Provision (recovery) for off balance sheet credit exposure |  |  | $ (14,000) | (2,000) |
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) |  |  | $ 371,177,000 |  | 384,564,000
Allowance for credit losses, loans |  |  | (376,000) | (612,000) |
Provision (recovery) for off balance sheet credit exposure |  |  | $ 3,000 | (1,000) |
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) |  |  | $ 351,481,000 |  | 290,541,000
Allowance for credit losses, loans |  |  | 774,000 | 224,000 |
Provision (recovery) for off balance sheet credit exposure |  |  | $ 88,000 | (612,000) |
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) |  |  | $ 239,787,000 |  | $ 232,520,000
Agricultural real estate terms if 75% loan-to-value ratio |  |  | 30 years |  |
Allowance for credit losses, loans |  |  | $ (80,000) | (141,000) |
Provision (recovery) for off balance sheet credit exposure |  |  | $ (8,000) | $ (11,000) |
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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