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Loans and Allowance for Loan Losses - Troubled Debt Restructurings That Are Not Performing (Details) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2021 USD ($) contract loan	Mar. 31, 2020 loan	Dec. 31, 2020 USD ($) contract
Number of contracts | loan	0	0
Nonperforming Financial Instruments [Member]
Number of contracts | contract	1		12
Recorded investment, not performing | $	$ 279		$ 2,201
Taxi Medallion Portfolio Segment [Member] | Nonperforming Financial Instruments [Member]
Number of contracts | contract	0		11
Recorded investment, not performing | $	$ 0		$ 1,922
Commercial Business and Other Portfolio Segment [Member] | Nonperforming Financial Instruments [Member]
Number of contracts | contract	1		1
Recorded investment, not performing | $	$ 279		$ 279

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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