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Loans and Allowance for Loan Losses - Troubled Debt Restructurings That Are Performing (Details)	9 Months Ended		12 Months Ended
	Sep. 30, 2020 USD ($) contract	Sep. 30, 2019 loan	Dec. 31, 2019 USD ($) contract
Number	1	3
Performing Financial Instruments [Member]
Number | contract	19		24
Amortized Cost	$ 5,182,000
Recorded investment			$ 6,494,000
Multi-Family Residential [Member] | Performing Financial Instruments [Member]
Number | contract	7		7
Amortized Cost	$ 1,876,000
Recorded investment			$ 1,873,000
One-To-Four Family - Mixed Used Property [Member]
Number	1
One-To-Four Family - Mixed Used Property [Member] | Performing Financial Instruments [Member]
Number | contract	5		4
Amortized Cost	$ 1,744,000
Recorded investment			$ 1,481,000
One-To-Four Family - Residential [Member] | Performing Financial Instruments [Member]
Number | contract	3		3
Amortized Cost	$ 513,000
Recorded investment			$ 531,000
Taxi Medallion Portfolio Segment [Member] | Performing Financial Instruments [Member]
Number | contract	1		7
Amortized Cost	$ 99,000
Recorded investment			$ 1,668,000
Commercial Business and Other [Member]
Number | loan		3
Commercial Business and Other [Member] | Performing Financial Instruments [Member]
Number | contract	3		3
Amortized Cost	$ 950,000
Recorded investment			$ 941,000

X

- Definition

The amount of amortized cost of financing receivables modified as troubled debt restructuring.

+ References

No definition available.

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- Definition

Number of financing receivables that have been modified by troubled debt restructurings.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953676-111524

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- Definition

Amount of financing receivable modified as troubled debt restructuring.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953676-111524

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 40
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=118939409&loc=d3e18845-111554

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