Loans Held for Sale - Delinquent and Non-performing Loans Sold During the Period Indicated (Details) - Nonperforming Financial Instruments [Member] $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021 USD ($) loan	Sep. 30, 2020 loan	Sep. 30, 2021 USD ($) loan	Sep. 30, 2020 USD ($) loan
Loans sold | loan	6	0	27	2
Proceeds	$ 6,383		$ 24,967	$ 580
Net Recoveries (Charge-offs)			(121)
Net gain	$ 131		$ 289
Net gain (loss)				$ 42
Multi-family Residential Portfolio Segment [Member]
Loans sold | loan	2		10	1
Proceeds	$ 1,316		$ 12,069	$ 284
Net Recoveries (Charge-offs)			(43)
Net gain	$ 15		$ 78
Net gain (loss)				$ 42
Commercial Real Estate
Loans sold | loan	1		4
Proceeds	$ 4,344		$ 7,380
Net Recoveries (Charge-offs)			(64)
Net gain	$ 87		$ 104
One-To-Four Family - Mixed-Use Property Portfolio Segment [Member]
Loans sold | loan	3		13	1
Proceeds	$ 723		$ 5,518	$ 296
Net Recoveries (Charge-offs)			(14)
Net gain	$ 29		$ 107