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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, 2020 loan	Sep. 30, 2019 USD ($) loan	Sep. 30, 2020 USD ($) loan	Sep. 30, 2019 USD ($) loan
Nonperforming Financial Instruments [Member]
Loans sold | loan		2	2	5
Proceeds		$ 3,948	$ 580	$ 5,118
Net (charge-offs) recoveries			0	(1)
Net gain (loss)		$ 204	$ 42	$ 267
Nonperforming Financial Instruments [Member] | Multi-family Residential Portfolio Segment [Member]
Loans sold | loan		1	1	3
Proceeds		$ 700	$ 284	$ 1,465
Net (charge-offs) recoveries			0	0
Net gain (loss)		$ 204	$ 42	$ 267
Nonperforming Financial Instruments [Member] | Commercial Real Estate Portfolio Segment [Member]
Loans sold | loan				1
Proceeds				$ 3,248
Net (charge-offs) recoveries				0
Net gain (loss)				$ 0
Nonperforming Financial Instruments [Member] | One-To-Four Family - Mixed-Use Property Portfolio Segment [Member]
Loans sold | loan			1	1
Proceeds			$ 296	$ 405
Net (charge-offs) recoveries			0	(1)
Net gain (loss)			$ 0	$ 0
Nonperforming Financial Instruments [Member] | Small Business Administration Portfolio Segment [Member]
Loans sold | loan		1
Proceeds		$ 3,248
Performing Financial Instruments [Member]
Loans sold | loan	0			3
Proceeds				$ 2,069
Net (charge-offs) recoveries				0
Net gain (loss)				$ 114
Performing Financial Instruments [Member] | Small Business Administration Portfolio Segment [Member]
Loans sold | loan				3
Proceeds				$ 2,069
Net (charge-offs) recoveries				0
Net gain (loss)				$ 114

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Amount of net recoveries (charge-offs) during the period on delinquent and non-performing loans during the period.

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