Fair Value Measurements - Schedule of financial instruments (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2025	Jun. 30, 2024
Financial assets
Cash and cash equivalents	$ 192,859	$ 60,904
Interest-bearing time deposits	246	491
Stock in FHLB	9,361	8,713
Stock in Federal Reserve Bank of St. Louis	9,139	9,089
Loans held for sale	431
Loans receivable, net	4,048,961	3,797,287
Accrued interest receivable	26,018	23,826
Mortgage servicing assets	2,297	2,448
Derivative financial instruments	912	20
Financial liabilities
Deposits	4,281,368	3,943,059
Securities sold under agreements to repurchase	15,000	9,398
Advances from FHLB	104,052	102,050
Accrued interest payable	14,186	12,868
Subordinated debt	23,208	23,156
Derivative financial instruments	877	15
Fair Value, Inputs, Level 1
Financial assets
Cash and cash equivalents	192,859	60,904
Financial liabilities
Deposits	2,632,774	2,607,653
Fair Value, Inputs, Level 2
Financial assets
Interest-bearing time deposits	246	491
Stock in FHLB	9,361	8,713
Stock in Federal Reserve Bank of St. Louis	9,139	9,089
Loans held for sale	431
Accrued interest receivable	26,018	23,826
Derivative financial instruments	912	20
Financial liabilities
Securities sold under agreements to repurchase	15,000	9,398
Advances from FHLB	104,561	100,468
Accrued interest payable	14,186	12,868
Derivative financial instruments	877	15
Fair Value, Inputs, Level 3
Financial assets
Loans receivable, net	3,976,696	3,639,657
Mortgage servicing assets	2,297	2,448
Financial liabilities
Deposits	1,650,046	1,338,215
Subordinated debt	$ 21,722	$ 20,576