Fair Value Measurements - Schedule of financial instruments (Details) - USD ($) $ in Thousands	12 Months Ended
Jun. 30, 2025	Jun. 30, 2026
Financial assets
Cash and cash equivalents	$ 192,859	$ 90,966
Interest-bearing time deposits	246
Stock in FHLB	9,361	10,930
Stock in Federal Reserve Bank of St. Louis	9,139	9,181
Loans held for sale	431	1,787
Loans receivable, net	4,048,961	4,336,896
Accrued interest receivable	26,018	26,868
Mortgage servicing rights	2,297
Derivative financial instruments	912
Financial liabilities
Deposits	4,281,368	4,407,846
Securities sold under agreements to repurchase	15,000	20,000
Advances from FHLB	104,052	130,424
Accrued interest payable	14,186	11,782
Subordinated debt	23,208	15,766
Derivative financial instruments	877
Fair Value, Inputs, Level 1
Financial assets
Cash and cash equivalents	192,859	90,966
Financial liabilities
Deposits	2,632,774	2,669,144
Fair Value, Inputs, Level 2
Financial assets
Interest-bearing time deposits	246
Stock in FHLB	9,361	10,930
Stock in Federal Reserve Bank of St. Louis	9,139	9,181
Loans held for sale		1,787
Accrued interest receivable	26,018	26,868
Derivative financial instruments	912
Financial liabilities
Securities sold under agreements to repurchase	15,000	20,000
Advances from FHLB	104,561	130,428
Accrued interest payable	14,186	11,782
Derivative financial instruments	877
Fair Value, Inputs, Level 3
Financial assets
Loans receivable, net	3,976,696	4,275,156
Mortgage servicing rights	2,297
Financial liabilities
Deposits	1,650,046	1,736,455
Subordinated debt	$ 21,722	$ 15,358

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