Deposits - Summary of deposits (Details) - USD ($) $ in Thousands	Jun. 30, 2026	Jun. 30, 2025
Deposits
Checking deposits - noninterest-bearing	$ 86,859	$ 83,566
Checking deposits - interest-bearing	226,695	240,597
Savings deposits	223,136	230,610
Money market deposits	20,450	21,703
Total deposits	$ 910,383	$ 888,772
Weighted average interest rate on deposits	1.43%	1.34%
Uninsured deposits	$ 178,600	$ 158,700
Deposit collateral issued	61,200	53,800
$250 and under
Deposits
Time deposits	249,279	221,475
Brokered certificates of deposit	161,400	131,000
Over $250
Deposits
Time deposits	$ 103,964	$ 90,821
Minimum
Deposits
Checking deposits - interest-bearing, Interest Rate	0.00%	0.00%
Savings deposits, Interest Rate	0.00%	0.00%
Money market deposits, Interest Rate	0.00%	0.00%
Minimum \| $250 and under
Deposits
Time deposits, Interest Rate	0.00%	0.00%
Minimum \| Over $250
Deposits
Time deposits, Interest Rate	0.10%	0.12%
Maximum
Deposits
Checking deposits - interest-bearing, Interest Rate	0.20%	0.20%
Savings deposits, Interest Rate	4.24%	4.64%
Money market deposits, Interest Rate	3.68%	2.96%
Maximum \| $250 and under
Deposits
Time deposits, Interest Rate	4.20%	5.15%
Maximum \| Over $250
Deposits
Time deposits, Interest Rate	4.20%	4.83%

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- Definition

Interest Rate, Domestic Deposit, Checking

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Interest Rate, Domestic Deposit, Money Market

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Interest Rate, Domestic Deposit, Time Deposit

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- Definition

Amount of securities, mortgage loans, or other financial instruments pledged as collateral for deposits.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 942
-SubTopic 405
-Section 50
-Paragraph 1
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478353/942-405-50-1

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- Definition

Amount of uninsured deposit liability.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name Regulation S-K (SK)
-Number 229
-Section 1406
-Paragraph e
-Publisher SEC

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The aggregate of all deposit liabilities held by the entity, including foreign and domestic, interest and noninterest bearing; may include demand deposits, saving deposits, Negotiable Order of Withdrawal (NOW) and time deposits among others.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 942
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(12))
-Publisher FASB
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Amount of interest-bearing domestic certificate of deposit liabilities.

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Amount of interest-bearing domestic checking deposit liabilities.

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Amount of interest-bearing domestic money market demand account deposit liabilities.

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Amount of interest-bearing domestic savings deposit liabilities. Saving deposits bear interest and have no stated maturity.

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Amount of interest-bearing domestic time deposits. Time deposits bear interest for a fixed, stated period of time and include certificate of deposits and individual retirement accounts.

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Amount of noninterest-bearing domestic checking deposit liabilities.

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Weighted average interest rate calculated at point in time for domestic deposit liability.

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