Fair Value Measurements - Schedule of financial instruments (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Mar. 31, 2022	Jun. 30, 2021
Financial assets
Cash and cash equivalents	$ 248,584	$ 123,592
Interest-bearing time deposits	4,828	979
Stock in FHLB	6,081	5,873
Stock in Federal Reserve Bank of St. Louis	5,035	5,031
Loans receivable, net	2,579,106	2,200,244
Accrued interest receivable	10,409	10,079
Financial liabilities
Deposits	2,854,906	2,330,803
Advances from FHLB	42,941	57,529
Accrued interest payable	869	779
Subordinated debt	23,043	15,243
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	248,584	123,592
Financial liabilities
Deposits	2,206,626	1,768,217
Fair Value, Inputs, Level 2
Financial assets
Interest-bearing time deposits	4,828	979
Stock in FHLB	6,081	5,873
Stock in Federal Reserve Bank of St. Louis	5,035	5,031
Accrued interest receivable	10,409	10,079
Financial liabilities
Advances from FHLB	42,181	58,587
Accrued interest payable	869	779
Fair Value, Inputs, Level 3
Financial assets
Loans receivable, net	2,575,889	2,218,762
Financial liabilities
Deposits	649,093	565,123
Subordinated debt	$ 23,352	$ 15,468