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Loans held for sale - Delinquent and Non-performing Loans Sold During the Period Indicated (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025 USD ($) loan	Sep. 30, 2024 USD ($) loan	Sep. 30, 2025 USD ($) loan	Sep. 30, 2024 USD ($) loan
Performing loans
Loans held for sale
Loans sold | loan	2	2	21	2
Proceeds	$ 1,820	$ 8,321	$ 45,489	$ 8,321
Net gain	$ 270		$ 802
Performing loans | Multi-family residential
Loans held for sale
Loans sold | loan		1	12	1
Proceeds		$ 2,446	$ 33,721	$ 2,446
Performing loans | Commercial
Loans held for sale
Loans sold | loan		1	1	1
Proceeds		$ 5,875	$ 3,120	$ 5,875
Performing loans | Small Business Administration
Loans held for sale
Loans sold | loan	2		8
Proceeds	$ 1,820		$ 8,648
Net gain	$ 270		$ 802
Delinquent and non-performing loans
Loans held for sale
Loans sold | loan	8	4	15	15
Proceeds	$ 4,796	$ 5,939	$ 23,475	$ 10,439
Net Charge-offs	(20)		(1,701)
Net gain	$ 48	$ 137	$ 507	$ 273
Delinquent and non-performing loans | Multi-family residential
Loans held for sale
Loans sold | loan	5	1	10	5
Proceeds	$ 3,425	$ 989	$ 16,869	$ 2,973
Net Charge-offs			(1,681)
Net gain	$ 48		$ 250	$ 55
Delinquent and non-performing loans | Commercial
Loans held for sale
Loans sold | loan		1	1	3
Proceeds		$ 2,827	$ 5,098	$ 3,797
Net gain			$ 238
Delinquent and non-performing loans | One-to-four family - mixed- use property
Loans held for sale
Loans sold | loan	3	1	4	6
Proceeds	$ 1,371	$ 900	$ 1,508	$ 2,446
Net Charge-offs	$ (20)		(20)
Net gain		$ 113	$ 19	$ 194
Delinquent and non-performing loans | One-to-four family - residential
Loans held for sale
Loans sold | loan		1		1
Proceeds		$ 1,223		$ 1,223
Net gain		$ 24		$ 24

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