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Loans and Allowance for Loan Losses - Troubled Debt Restructurings That Are Not Performing (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Number of contracts	0
Nonperforming Financial Instruments [Member]
Number of contracts	5	2
Recorded investment, not performing	$ 1,344	$ 1,785
Multi-family Residential Portfolio Segment [Member] | Nonperforming Financial Instruments [Member]
Number of contracts	0	1
Recorded investment, not performing	$ 0	$ 388
Taxi Medallion Portfolio Segment [Member] | Nonperforming Financial Instruments [Member]
Number of contracts	4	0
Recorded investment, not performing	$ 1,065	$ 0
Commercial Business and Other Portfolio Segment [Member] | Nonperforming Financial Instruments [Member]
Number of contracts	1	1
Recorded investment, not performing	$ 279	$ 1,397

X

- 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=118936363&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=118936363&loc=SL6953682-111524

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