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Loans Held for Sale - Delinquent and Non-performing Loans Sold During the Period Indicated (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Nonperforming Financial Instruments [Member]
Loans sold	11	12	17
Proceeds	$ 13,048	$ 8,739	$ 6,216
Net (charge-offs) recoveries	(1)	68	(37)
Net gain (loss)	$ 756	$ (225)	$ 415
Nonperforming Financial Instruments [Member] | Multi-family Residential Portfolio Segment [Member]
Loans sold	5	4	3
Proceeds	$ 2,115	$ 1,559	$ 872
Net (charge-offs) recoveries	0	0	0
Net gain (loss)	$ 367	$ 0	$ 38
Nonperforming Financial Instruments [Member] | Commercial Real Estate Portfolio Segment [Member]
Loans sold	2	4	5
Proceeds	$ 6,800	$ 6,065	$ 1,821
Net (charge-offs) recoveries	0	0	(4)
Net gain (loss)	$ 383	$ (235)	$ 34
Nonperforming Financial Instruments [Member] | One-To-Four Family - Mixed-Use Property Portfolio Segment [Member]
Loans sold	3	2	9
Proceeds	$ 885	$ 725	$ 3,523
Net (charge-offs) recoveries	(1)	(4)	(33)
Net gain (loss)	$ 6	$ 0	$ 343
Nonperforming Financial Instruments [Member] | One-To-Four Family - Residential Portfolio Segment [Member]
Loans sold	1	2
Proceeds	$ 3,248	$ 390
Net (charge-offs) recoveries	0	72
Net gain (loss)	$ 0	$ 10
Performing Financial Instruments [Member]
Loans sold	3	9	27
Proceeds	$ 2,069	$ 5,671	$ 50,128
Net (charge-offs) recoveries	0	0	0
Net gain (loss)	$ 114	$ 393	$ 188
Performing Financial Instruments [Member] | Multi-family Residential Portfolio Segment [Member]
Loans sold			12
Proceeds			$ 18,784
Net (charge-offs) recoveries			0
Net gain (loss)			$ (36)
Performing Financial Instruments [Member] | Commercial Real Estate Portfolio Segment [Member]
Loans sold			7
Proceeds			$ 26,283
Net (charge-offs) recoveries			0
Net gain (loss)			$ (28)
Performing Financial Instruments [Member] | Small Business Administration Portfolio Segment [Member]
Loans sold	3	9	8
Proceeds	$ 2,069	$ 5,671	$ 5,061
Net (charge-offs) recoveries	0	0	0
Net gain (loss)	$ 114	$ 393	$ 252

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