Organization and Summary of Significant Accounting Policies - ACL from the adoption of ASC 326 (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Jul. 01, 2023	Jun. 30, 2023	Jun. 30, 2022
Accounting standard updates ("ASU")
ACL on loans	$ 7,065		$ 5,946	$ 5,564
ACL on loans			5,946	5,564
Unfunded loan commitment reserve
Accounting standard updates ("ASU")
Unfunded loan commitment reserve			42
Mortgage loans | Single-family
Accounting standard updates ("ASU")
ACL on loans	6,295		1,720
ACL on loans			1,720	1,383
Mortgage loans | Multi Family
Accounting standard updates ("ASU")
ACL on loans	595		3,270
ACL on loans			3,270	3,282
Mortgage loans | Commercial real estate
Accounting standard updates ("ASU")
ACL on loans			868
Mortgage loans | Construction
Accounting standard updates ("ASU")
ACL on loans	97		15
ACL on loans			15	23
Mortgage loans | Other
Accounting standard updates ("ASU")
ACL on loans	1		2
ACL on loans			2	3
Commercial business loans
Accounting standard updates ("ASU")
ACL on loans	$ 11		67
ACL on loans			67	52
Consumer loans
Accounting standard updates ("ASU")
ACL on loans			4
ACL on loans			4	$ 5
ASC 326 | Allowance for credit losses under ASC 326
Accounting standard updates ("ASU")
ACL on loans		$ 7,143
ASC 326 | Allowance for credit losses under ASC 326 | Unfunded loan commitment reserve
Accounting standard updates ("ASU")
Unfunded loan commitment reserve		42
ASC 326 | Allowance for credit losses under ASC 326 | Mortgage loans | Single-family
Accounting standard updates ("ASU")
ACL on loans		6,325
ASC 326 | Allowance for credit losses under ASC 326 | Mortgage loans | Multi Family
Accounting standard updates ("ASU")
ACL on loans		656
ASC 326 | Allowance for credit losses under ASC 326 | Mortgage loans | Commercial real estate
Accounting standard updates ("ASU")
ACL on loans		82
ASC 326 | Allowance for credit losses under ASC 326 | Mortgage loans | Construction
Accounting standard updates ("ASU")
ACL on loans		62
ASC 326 | Allowance for credit losses under ASC 326 | Mortgage loans | Other
Accounting standard updates ("ASU")
ACL on loans		5
ASC 326 | Allowance for credit losses under ASC 326 | Commercial business loans
Accounting standard updates ("ASU")
ACL on loans		13
ASC 326 | Impact of ASU adoption
Accounting standard updates ("ASU")
ACL on loans		1,197	1,197
ASC 326 | Impact of ASU adoption | Mortgage loans | Single-family
Accounting standard updates ("ASU")
ACL on loans		4,605	4,605
ASC 326 | Impact of ASU adoption | Mortgage loans | Multi Family
Accounting standard updates ("ASU")
ACL on loans		(2,614)	(2,614)
ASC 326 | Impact of ASU adoption | Mortgage loans | Commercial real estate
Accounting standard updates ("ASU")
ACL on loans		(786)
ASC 326 | Impact of ASU adoption | Mortgage loans | Construction
Accounting standard updates ("ASU")
ACL on loans		47	47
ASC 326 | Impact of ASU adoption | Mortgage loans | Other
Accounting standard updates ("ASU")
ACL on loans		3	3
ASC 326 | Impact of ASU adoption | Commercial business loans
Accounting standard updates ("ASU")
ACL on loans		(54)	(54)
ASC 326 | Impact of ASU adoption | Consumer loans
Accounting standard updates ("ASU")
ACL on loans		$ (4)	$ (4)