Fair Value Measurements and Fair Value of Financial Instruments - Fair Value Measurements and Fair Value of Financial Instruments, Carrying Amount and Estimated Fair Value (Details) - USD ($) $ in Thousands	Dec. 31, 2025	Mar. 31, 2025	Jun. 30, 2024
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities available-for-sale	$ 355,432	$ 355,432	$ 350,001
Equity securities		400	328
Carrying Amount [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents		155,483	190,395
Long-term certificates of deposit		1,640	2,831
Securities available-for-sale		355,432	350,001
Securities held-to-maturity		781,338	690,354
Equity securities		400	328
Federal Home Loan Bank stock		3,834	7,296
Net loans receivable		1,598,182	1,480,229
Accrued interest receivable		18,433	14,269
Interest rate swaps asset		2,865	585
Deposits		2,654,717	2,389,222
Borrowings		44,195	149,456
Subordinated notes payable, net		49,820	49,681
Accrued interest payable		612	1,551
Interest rate swaps liability		2,865	585
Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents		155,483	190,395
Long-term certificates of deposit		1,631	2,760
Securities available-for-sale		355,432	350,001
Securities held-to-maturity		735,692	630,241
Equity securities		400	328
Federal Home Loan Bank stock		3,834	7,296
Net loans receivable		1,523,665	1,387,325
Accrued interest receivable		18,433	14,269
Interest rate swaps asset		2,865	585
Deposits		2,653,936	2,388,305
Borrowings		44,263	149,438
Subordinated notes payable, net		46,697	46,114
Accrued interest payable		612	1,551
Interest rate swaps liability		2,865	585
Fair Value [Member] | Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents		155,483	190,395
Long-term certificates of deposit		0	0
Securities available-for-sale		0	0
Securities held-to-maturity		0	0
Equity securities		400	328
Federal Home Loan Bank stock		0	0
Net loans receivable		0	0
Accrued interest receivable		0	0
Interest rate swaps asset		0	0
Deposits		0	0
Borrowings		0	0
Subordinated notes payable, net		0	0
Accrued interest payable		0	0
Interest rate swaps liability		0	0
Fair Value [Member] | Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents		0	0
Long-term certificates of deposit		1,631	2,760
Securities available-for-sale		355,432	350,001
Securities held-to-maturity		735,692	630,241
Equity securities		0	0
Federal Home Loan Bank stock		3,834	7,296
Net loans receivable		0	0
Accrued interest receivable		18,433	14,269
Interest rate swaps asset		2,865	585
Deposits		2,653,936	2,388,305
Borrowings		44,263	149,438
Subordinated notes payable, net		46,697	46,114
Accrued interest payable		612	1,551
Interest rate swaps liability		2,865	585
Fair Value [Member] | Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents		0	0
Long-term certificates of deposit		0	0
Securities available-for-sale		0	0
Securities held-to-maturity		0	0
Equity securities		0	0
Federal Home Loan Bank stock		0	0
Net loans receivable		1,523,665	1,387,325
Accrued interest receivable		0	0
Interest rate swaps asset		0	0
Deposits		0	0
Borrowings		0	0
Subordinated notes payable, net		0	0
Accrued interest payable		0	0
Interest rate swaps liability		$ 0	$ 0