Fair Value Measurements - Schedule of financial instruments (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Financial assets
Cash and cash equivalents	$ 86,792	$ 123,592
Interest-bearing time deposits	4,768	979
Stock in FHLB	5,893	5,873
Stock in Federal Reserve Bank of St. Louis	5,790	5,031
Loans receivable, net	2,686,198	2,200,244
Accrued interest receivable	11,052	10,079
Financial liabilities
Deposits	2,815,075	2,330,803
Advances from FHLB	37,957	57,529
Accrued interest payable	801	779
Subordinated debt	23,055	15,243
Fair Value, Inputs, Level 1
Financial assets
Cash and cash equivalents	86,792	123,592
Financial liabilities
Deposits	2,176,444	1,768,217
Fair Value, Inputs, Level 2
Financial assets
Interest-bearing time deposits	4,768	979
Stock in FHLB	5,893	5,873
Stock in Federal Reserve Bank of St. Louis	5,790	5,031
Accrued interest receivable	11,052	10,079
Financial liabilities
Advances from FHLB	35,916	58,587
Accrued interest payable	801	779
Fair Value, Inputs, Level 3
Financial assets
Loans receivable, net	2,655,882	2,218,762
Financial liabilities
Deposits	637,163	565,123
Subordinated debt	$ 22,070	$ 15,468