Fair Value Measurements - Schedule of financial instruments (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2024	Jun. 30, 2023
Financial assets
Cash and cash equivalents	$ 60,904	$ 53,979
Interest-bearing time deposits	491	1,242
Stock in FHLB	8,713	11,540
Stock in Federal Reserve Bank of St. Louis	9,089	9,061
Loans receivable, net	3,797,287	3,571,078
Accrued interest receivable	23,826	18,871
Mortgage Servicing Assets, Fair Value Disclosure	2,448
Derivative financial instruments	20
Financial liabilities
Deposits	3,952,457	3,725,540
Advances from FHLB	102,050	133,514
Accrued interest payable	12,868	4,723
Subordinated debt	23,156	23,105
Derivative financial instruments	15
Fair Value, Inputs, Level 1
Financial assets
Cash and cash equivalents	60,904	53,979
Financial liabilities
Deposits	2,607,653	2,661,479
Fair Value, Inputs, Level 2
Financial assets
Interest-bearing time deposits	491	1,242
Stock in FHLB	8,713	11,540
Stock in Federal Reserve Bank of St. Louis	9,089	9,061
Accrued interest receivable	23,826	18,871
Derivative financial instruments	20
Financial liabilities
Advances from FHLB	100,468	131,821
Accrued interest payable	12,868	4,723
Derivative financial instruments	15
Fair Value, Inputs, Level 3
Financial assets
Loans receivable, net	3,639,657	3,393,791
Mortgage Servicing Assets, Fair Value Disclosure	2,448
Financial liabilities
Deposits	1,338,215	1,053,650
Subordinated debt	$ 20,576	$ 20,318