Accounting Standard Updates - ACL from the adoption of ASC 326 (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Jun. 30, 2023
Accounting standard updates ("ASU")
ACL on loans	$ 7,679	$ 5,946
Unfunded loan commitment reserve
Accounting standard updates ("ASU")
Unfunded loan commitment reserve		42
Mortgage loans \| Single-family
Accounting standard updates ("ASU")
ACL on loans	6,875	1,720
Mortgage loans \| Multi Family
Accounting standard updates ("ASU")
ACL on loans	659	3,270
Mortgage loans \| Mortgage loans, Commercial real estate
Accounting standard updates ("ASU")
ACL on loans		868
Mortgage loans \| Construction
Accounting standard updates ("ASU")
ACL on loans	54	15
Mortgage loans \| Other
Accounting standard updates ("ASU")
ACL on loans	4	2
Commercial business loans
Accounting standard updates ("ASU")
ACL on loans	$ 11	67
Consumer loans
Accounting standard updates ("ASU")
ACL on loans		4
ASU 2016-13 \| Allowance for credit losses under ASC 326
Accounting standard updates ("ASU")
ACL on loans		7,143
ASU 2016-13 \| Allowance for credit losses under ASC 326 \| Unfunded loan commitment reserve
Accounting standard updates ("ASU")
Unfunded loan commitment reserve		42
ASU 2016-13 \| Allowance for credit losses under ASC 326 \| Mortgage loans \| Single-family
Accounting standard updates ("ASU")
ACL on loans		6,325
ASU 2016-13 \| Allowance for credit losses under ASC 326 \| Mortgage loans \| Multi Family
Accounting standard updates ("ASU")
ACL on loans		656
ASU 2016-13 \| Allowance for credit losses under ASC 326 \| Mortgage loans \| Mortgage loans, Commercial real estate
Accounting standard updates ("ASU")
ACL on loans		82
ASU 2016-13 \| Allowance for credit losses under ASC 326 \| Mortgage loans \| Construction
Accounting standard updates ("ASU")
ACL on loans		62
ASU 2016-13 \| Allowance for credit losses under ASC 326 \| Mortgage loans \| Other
Accounting standard updates ("ASU")
ACL on loans		5
ASU 2016-13 \| Allowance for credit losses under ASC 326 \| Commercial business loans
Accounting standard updates ("ASU")
ACL on loans		13
ASU 2016-13 \| Impact to allowance after ASC 326 adoption
Accounting standard updates ("ASU")
ACL on loans		1,197
ASU 2016-13 \| Impact to allowance after ASC 326 adoption \| Mortgage loans \| Single-family
Accounting standard updates ("ASU")
ACL on loans		4,605
ASU 2016-13 \| Impact to allowance after ASC 326 adoption \| Mortgage loans \| Multi Family
Accounting standard updates ("ASU")
ACL on loans		(2,614)
ASU 2016-13 \| Impact to allowance after ASC 326 adoption \| Mortgage loans \| Mortgage loans, Commercial real estate
Accounting standard updates ("ASU")
ACL on loans		(786)
ASU 2016-13 \| Impact to allowance after ASC 326 adoption \| Mortgage loans \| Construction
Accounting standard updates ("ASU")
ACL on loans		47
ASU 2016-13 \| Impact to allowance after ASC 326 adoption \| Mortgage loans \| Other
Accounting standard updates ("ASU")
ACL on loans		3
ASU 2016-13 \| Impact to allowance after ASC 326 adoption \| Commercial business loans
Accounting standard updates ("ASU")
ACL on loans		(54)
ASU 2016-13 \| Impact to allowance after ASC 326 adoption \| Consumer loans
Accounting standard updates ("ASU")
ACL on loans		$ (4)