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Loans and Allowance for Loan Losses - Troubled Debt Restructurings That Are Performing (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017
Number	3	1	10
Performing Financial Instruments [Member]
Number	24	31
Recorded investment	$ 6,494	$ 8,365
Multi-Family Residential [Member] | Performing Financial Instruments [Member]
Number	7	7
Recorded investment	$ 1,873	$ 1,916
One-To-Four Family - Mixed Used Property [Member] | Performing Financial Instruments [Member]
Number	4	5
Recorded investment	$ 1,481	$ 1,692
One-To-Four Family - Residential [Member] | Performing Financial Instruments [Member]
Number	3	3
Recorded investment	$ 531	$ 552
Taxi Medallion Portfolio Segment [Member] | Performing Financial Instruments [Member]
Number	7	15
Recorded investment	$ 1,668	$ 3,926
Commercial Business and Other [Member] | Performing Financial Instruments [Member]
Number	3	1
Recorded investment	$ 941	$ 279

X

- 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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