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Loans and Allowance for Credit Losses - Classes of loans information (Details) - USD ($) |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jan. 20, 2023 | Feb. 25, 2022 | Jun. 30, 2024 | Mar. 31, 2024 | Dec. 31, 2023 | Sep. 30, 2023 | Jun. 30, 2023 | Mar. 31, 2023 | Dec. 31, 2022 | Sep. 30, 2022 | Jun. 30, 2022 | Mar. 31, 2022 | Sep. 30, 2021 | Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2022
Provision for credit losses |  |  | $ 900,000 | $ 900,000 | $ 900,000 | $ 900,000 | $ 795,000 | $ 10,072,000 | $ 1,138,000 | $ 5,056,000 | $ 240,000 | $ 1,552,000 | $ (305,000) | $ 3,600,000 | $ 17,061,000 | $ 1,487,000
Allowance for credit losses, loans |  |  |  |  |  |  |  |  |  |  |  |  |  | 6,625,000 | 14,131,000 | (66,000)
Provision (recovery) for off balance sheet credit exposure |  |  |  |  |  |  |  |  |  |  |  |  |  | (3,025,000) | 2,930,000 | 1,553,000
Allowance for credit losses for purchased credit deteriorated (PCD) |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,600,000 | $ 17,100,000 | 1,500,000
Impact of acquisition on provision on credit losses (PCL) |  |  |  |  |  |  |  |  |  |  |  |  |  | 10,100,000 |  |
Impact of acquisition on allowance for credit losses (ACL) |  |  |  |  |  |  |  |  |  |  |  |  |  | 8,900,000 |  |
Impact of acquisition on off-balance sheet credit exposure |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,200,000 |  |
Net charge offs on average loans outstanding (as percentage) |  |  |  |  |  |  |  |  |  |  |  |  |  | 5.00% | 2.00% |
Citizens Bancshares Company |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Allowance for credit losses, loans |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 5,200,000 |  |
Allowance for credit losses for purchased credit deteriorated (PCD) | $ 1,121,000 |  |  |  |  |  |  |  |  |  |  |  |  | 1,100,000 |  |
Fortune |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Allowance for credit losses for purchased credit deteriorated (PCD) |  | $ 120,000 |  |  |  |  |  |  |  |  |  |  |  |  | $ 120,000 |
ACL required for non-PCD loans acquired |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,900,000 |  |
Credit exposure |  |  |  |  |  |  |  |  |  |  |  |  |  | 120,000 |  |
Negative PCL |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 533,000 |
Secured by properties located outside lending area |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loans Receivable |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 626,300,000 |  |
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 real estate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,600,000,000 |  |
Residential Real Estate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization period of loans |  |  |  |  |  |  |  |  |  |  |  |  |  | 30 years |  |
Allowance for credit losses, loans |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 713,000 | 6,655,000 | (2,238,000)
Provision (recovery) for off balance sheet credit exposure |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 16,000 | 13,000 | 21,000
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 |  |
Allowance for credit losses, loans |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 4,100,000 | 5,605,000 | 2,251,000
Provision (recovery) for off balance sheet credit exposure |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (105,000) | 54,000 | 233,000
Construction Real Estate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Average term of construction loans |  |  |  |  |  |  |  |  |  |  |  |  |  | 12 months |  |
Allowance for credit losses, loans |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (174,000) | 432,000 | 46,000
Provision (recovery) for off balance sheet credit exposure |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (2,917,000) | 2,631,000 | 1,676,000
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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization period of loans |  |  |  |  |  |  |  |  |  |  |  |  |  | 66 months |  |
Allowance for credit losses, loans |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 482,000 | 334,000 | (205,000)
Provision (recovery) for off balance sheet credit exposure |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 3,000 | 12,000 | (157,000)
Consumer | Home Equity Loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum percentage of appraised value or purchase price that loans cannot exceed |  |  |  |  |  |  |  |  |  |  |  |  |  | 90.00% |  |
Amortization period of loans |  |  |  |  |  |  |  |  |  |  |  |  |  | 10 years |  |
Consumer | Automobile Loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum percentage of appraised value or purchase price that loans cannot exceed |  |  |  |  |  |  |  |  |  |  |  |  |  | 100.00% |  |
Amortization period of loans |  |  |  |  |  |  |  |  |  |  |  |  |  | 66 months |  |
Commercial |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization period of loans |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 years |  |
Amortization period of multi-family residential loans if balloon maturities |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 year |  |
Allowance for credit losses, loans |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,504,000 | 1,105,000 | 80,000
Provision (recovery) for off balance sheet credit exposure |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (22,000) | $ 220,000 | $ (220,000)
Term Extension Modifications | Construction Real Estate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Incremental period that the loan maturity can be extended to |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 months |  |

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