Loans Held for Sale - Delinquent and Non-performing Loans Sold During the Period Indicated (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020 loan	Jun. 30, 2019 USD ($) loan	Jun. 30, 2020 USD ($) loan	Jun. 30, 2019 USD ($) loan
Nonperforming Financial Instruments [Member]
Loans sold | loan			2	3
Proceeds			$ 580	$ 1,170
Net (charge-offs) recoveries			0	(1)
Net gain (loss)			$ 42	$ 63
Nonperforming Financial Instruments [Member] | Multi-family Residential Portfolio Segment [Member]
Loans sold | loan			1	2
Proceeds			$ 284	$ 765
Net (charge-offs) recoveries			0	0
Net gain (loss)			$ 42	$ 63
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
Performing Financial Instruments [Member]
Loans sold | loan	0	3		3
Proceeds		$ 2,069		$ 2,069
Net (charge-offs) recoveries				0
Net gain (loss)		$ 114		$ 114
Performing Financial Instruments [Member] | Small Business Administration Portfolio Segment [Member]
Loans sold | loan		3		3
Proceeds		$ 2,069		$ 2,069
Net (charge-offs) recoveries				0
Net gain (loss)		$ 114		$ 114