Fair Value Measurements - Schedule of financial instruments (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Mar. 31, 2023	Jun. 30, 2022
Financial assets
Cash and cash equivalents	$ 114,540	$ 86,792
Interest-bearing time deposits	1,251	4,768
Stock in FHLB	7,855	5,893
Stock in Federal Reserve Bank of St. Louis	8,491	5,790
Loans receivable, net	3,434,519	2,686,198
Accrued interest receivable	16,372	11,052
Financial liabilities
Deposits	3,755,193	2,815,075
Advances from FHLB	45,002	37,957
Accrued interest payable	3,721	801
Subordinated debt	23,092	23,055
Unrecognized financial instruments (net of contract amount)
Commitments to originate loans	0
Letters of credit	0
Lines of credit	0
Fair Value, Inputs, Level 1
Financial assets
Cash and cash equivalents	114,540	86,792
Financial liabilities
Deposits	2,801,811	2,176,444
Fair Value, Inputs, Level 2
Financial assets
Interest-bearing time deposits	1,251	4,768
Stock in FHLB	7,855	5,893
Stock in Federal Reserve Bank of St. Louis	8,491	5,790
Accrued interest receivable	16,372	11,052
Financial liabilities
Advances from FHLB	44,088	35,916
Accrued interest payable	3,721	801
Fair Value, Inputs, Level 3
Financial assets
Loans receivable, net	3,272,957	2,655,882
Financial liabilities
Deposits	941,690	637,163
Subordinated debt	$ 20,345	$ 22,070