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Loans and Allowance for Loan Losses - Loans Modified and Classified as TDR (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Number	3	1	10
Balance	$ 951	$ 1,620	$ 6,741
Commercial Business and Other [Member] | Extended Maturity [Member]
Number	3	1
Balance	$ 951	$ 1,620
Taxi Medallion Portfolio Segment [Member] | Interest Rate Below Market Reduction [Member]
Number			10
Balance			$ 6,741

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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Namespace Prefix:	us-gaap_
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X

- Definition

Amount, after troubled debt restructuring, of modified financing receivable.

+ 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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