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Loans and Allowance for Credit Losses - Classes of loans information (Details) - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2024 | Dec. 31, 2023 | Jun. 30, 2024
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Total loans (before deferred loan fees, net) | $ 4,027,181,000 |  | $ 4,027,181,000 |  | $ 3,850,035,000
Provision for credit losses | 932,000 | $ 900,000 | 3,091,000 | $ 1,800,000 |
Allowance for credit losses, loans | 501,000 | 1,922,000 | 2,522,000 | 3,492,000 |
Provision (recovery) for off balance sheet credit exposure | 431,000 | (1,022,000) | $ 569,000 | $ (1,692,000) |
Net charge offs on average loans outstanding (as percentage) |  |  | 0.02% | 0.07% |
Commercial and industrial |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Amortization period of loans |  |  | 5 years |  |
Total loans (before deferred loan fees, net) | 484,799,000 |  | $ 484,799,000 |  | 450,147,000
Allowance for credit losses, loans | 1,943,000 | 894,000 | 1,858,000 | $ 794,000 |
Provision (recovery) for off balance sheet credit exposure | 230,000 | (39,000) | 250,000 | (2,000) |
Agriculture production |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Total loans (before deferred loan fees, net) | 188,284,000 |  | 188,284,000 |  | 175,968,000
Allowance for credit losses, loans | 276,000 | (127,000) | 225,000 | (212,000) |
Provision (recovery) for off balance sheet credit exposure | 93,000 | 134,000 | 90,000 | 50,000 |
Consumer |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Total loans (before deferred loan fees, net) | 56,017,000 |  | 56,017,000 |  | 59,671,000
Allowance for credit losses, loans | 202,000 | 103,000 | 215,000 | 141,000 |
Provision (recovery) for off balance sheet credit exposure | (6,000) | (3,000) | $ (6,000) | (2,000) |
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) | 3,628,000 |  | $ 3,628,000 |  | 3,981,000
Allowance for credit losses, loans | 10,000 | 1,000 | 7,000 | (4,000) |
Provision (recovery) for off balance sheet credit exposure |  | (7,000) |  | (10,000) |
Secured by real estate |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Total loans (before deferred loan fees, net) | 3,294,453,000 |  | $ 3,294,453,000 |  | 3,160,268,000
Allowance for credit losses, loans | 1,983,000 | 209,000 |  |  |
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) | 967,196,000 |  | $ 967,196,000 |  | 925,397,000
Allowance for credit losses, loans |  |  | 2,140,000 | 108,000 |
Provision (recovery) for off balance sheet credit exposure | 59,000 | 5,000 | $ 89,000 | 10,000 |
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 | 1-4 residential real estate | Non-owner occupied |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Allowance for credit losses, loans | (7,068,000) |  |  |  |
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) | 882,484,000 |  | $ 882,484,000 |  | 899,770,000
Term of variable interest applicability on loans |  |  | 7 years |  |
Allowance for credit losses, loans |  | 591,000 | $ (5,395,000) | 3,232,000 |
Provision (recovery) for off balance sheet credit exposure | 10,000 | (3,000) | $ 32,000 | (3,000) |
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) | 435,392,000 |  | $ 435,392,000 |  | 427,476,000
Allowance for credit losses, loans | 1,015,000 | (65,000) | 1,014,000 | (354,000) |
Provision (recovery) for off balance sheet credit exposure | 47,000 | (5,000) | $ 33,000 | (7,000) |
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) | 376,081,000 |  | $ 376,081,000 |  | 384,564,000
Allowance for credit losses, loans | 607,000 | 91,000 | 231,000 | (521,000) |
Provision (recovery) for off balance sheet credit exposure | 31,000 | (6,000) | $ 34,000 | (7,000) |
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) | 393,388,000 |  | $ 393,388,000 |  | 290,541,000
Allowance for credit losses, loans | 1,043,000 | 272,000 | 1,817,000 | 496,000 |
Provision (recovery) for off balance sheet credit exposure | (35,000) | (1,106,000) | $ 53,000 | (1,718,000) |
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) | 239,912,000 |  | $ 239,912,000 |  | $ 232,520,000
Agricultural real estate terms if 75% loan-to-value ratio |  |  | 30 years |  |
Allowance for credit losses, loans | 490,000 | (47,000) | $ 410,000 | (188,000) |
Provision (recovery) for off balance sheet credit exposure | $ 2,000 | $ 8,000 | $ (6,000) | $ (3,000) |
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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