Fair Value Measurements and Fair Value of Financial Instruments, Carrying Amount and Estimated Fair Value (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Jun. 30, 2023
Carrying Amounts and Estimated Fair Value of Financial Instruments [Abstract]
Securities available-for-sale	$ 308,716	$ 281,133
Equity securities	299	306
Carrying Amount [Member]
Carrying Amounts and Estimated Fair Value of Financial Instruments [Abstract]
Cash and cash equivalents	130,253	196,445
Long term certificates of deposit	4,070	4,576
Securities available-for-sale	308,716	281,133
Securities held-to-maturity	711,716	726,363
Equity securities	299	306
Federal Home Loan Bank stock	1,979	1,682
Net loans receivable	1,428,091	1,387,654
Accrued interest receivable	13,761	12,249
Interest rate swaps asset	71
Deposits	2,420,481	2,437,161
Borrowings	4,374
Subordinated notes payable, net	49,542	49,495
Accrued interest payable	531	936
Interest rate swaps liability	71
Fair Value [Member]
Carrying Amounts and Estimated Fair Value of Financial Instruments [Abstract]
Cash and cash equivalents	130,253	196,445
Long term certificates of deposit	3,905	4,383
Securities available-for-sale	308,716	281,133
Securities held-to-maturity	632,163	671,066
Equity securities	299	306
Federal Home Loan Bank stock	1,979	1,682
Net loans receivable	1,314,142	1,272,361
Accrued interest receivable	13,761	12,249
Interest rate swaps asset	71
Deposits	2,419,132	2,437,357
Borrowings	4,142
Subordinated notes payable, net	46,357	47,669
Accrued interest payable	531	936
Interest rate swaps liability	71
Fair Value [Member] | Level 1 [Member]
Carrying Amounts and Estimated Fair Value of Financial Instruments [Abstract]
Cash and cash equivalents	130,253	196,445
Long term certificates of deposit	0	0
Securities available-for-sale	0	0
Securities held-to-maturity	0	0
Equity securities	299	306
Federal Home Loan Bank stock	0	0
Net loans receivable	0	0
Accrued interest receivable	0	0
Interest rate swaps asset	0
Deposits	0	0
Borrowings	0
Subordinated notes payable, net	0	0
Accrued interest payable	0	0
Interest rate swaps liability	0
Fair Value [Member] | Level 2 [Member]
Carrying Amounts and Estimated Fair Value of Financial Instruments [Abstract]
Cash and cash equivalents	0	0
Long term certificates of deposit	3,905	4,383
Securities available-for-sale	308,716	281,133
Securities held-to-maturity	632,163	671,066
Equity securities	0	0
Federal Home Loan Bank stock	1,979	1,682
Net loans receivable	0	0
Accrued interest receivable	13,761	12,249
Interest rate swaps asset	71
Deposits	2,419,132	2,437,357
Borrowings	4,142
Subordinated notes payable, net	46,357	47,669
Accrued interest payable	531	936
Interest rate swaps liability	71
Fair Value [Member] | Level 3 [Member]
Carrying Amounts and Estimated Fair Value of Financial Instruments [Abstract]
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	1,314,142	1,272,361
Accrued interest receivable	0	0
Interest rate swaps asset	0
Deposits	0	0
Borrowings	0
Subordinated notes payable, net	0	0
Accrued interest payable	0	$ 0
Interest rate swaps liability	$ 0