Loans held for sale - Delinquent and Non-performing Loans Sold During the Period Indicated (Details) - Nonperforming Financial Instruments [Member] $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024 USD ($) loan	Jun. 30, 2023 USD ($) loan	Jun. 30, 2024 USD ($) loan	Jun. 30, 2023 USD ($) loan
Loans sold | loan	2	5	11	13
Proceeds	$ 690	$ 4,466	$ 4,500	$ 7,042
Net Charge-offs				(8)
Net gain	$ 26	$ 54	$ 136	$ 108
Multi-family Residential Portfolio Segment [Member]
Loans sold | loan	1	2	4	7
Proceeds	$ 432	$ 2,074	$ 1,984	$ 3,622
Net gain		$ 14	$ 55	$ 69
Commercial Real Estate [Member]
Loans sold | loan		1	2	3
Proceeds		$ 1,026	$ 970	$ 1,867
Net Charge-offs				$ (8)
One-To-Four Family - Mixed-Use Property Portfolio Segment [Member]
Loans sold | loan	1	2	5	3
Proceeds	$ 258	$ 1,366	$ 1,546	$ 1,553
Net gain	$ 26	$ 40	$ 81	$ 39