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Loans - Troubled Debt Restructurings That Are Not Performing (Details)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2021 USD ($) loan	Sep. 30, 2020 USD ($) loan	Sep. 30, 2021 USD ($) contract loan	Sep. 30, 2020 USD ($) loan	Dec. 31, 2020 USD ($) contract
Number of contracts		1	2	1
Number of contracts | loan	0	0		0
TDR subsequent recoveries	$ 1,500,000		$ 1,500,000
Nonperforming Financial Instruments [Member]
Number of contracts | contract					12
Amortized Cost					$ 2,201,000
One-To-Four Family - Mixed Used Property [Member]
Number of contracts		1		1
Taxi Medallion Portfolio Segment [Member] | Nonperforming Financial Instruments [Member]
Number of contracts | contract			0		11
Amortized Cost	$ 0		$ 0		$ 1,922,000
Commercial Business and Other Portfolio Segment [Member]
Number of contracts | loan			1
Recorded investment, subsequent default			$ 300,000
Commercial Business and Other Portfolio Segment [Member] | Nonperforming Financial Instruments [Member]
Number of contracts | contract					1
Amortized Cost					$ 279,000

X

- Definition

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

+ References

No definition available.

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- Definition

The amount of subsequent recovery of financing receivable modified as troubled debt restructuring that was previously charged-off.

+ References

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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=121611835&loc=SL6953676-111524

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- Definition

Number of financing receivable contracts modified as troubled debt restructuring within previous 12 months, with subsequent payment default.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 34
-URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953682-111524

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- Definition

Amount of financing receivable modified as troubled debt restructuring within previous 12 months, with subsequent payment default.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 34
-Subparagraph (a)(2)
-URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953682-111524

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