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Note 3 - Loans and Allowance for Loan Losses - Loans Modified and Classified as TDR (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
Financing Receivable, Modifications, Number of Contracts	10	15	1
Financing Receivable, Modifications, Balance	$ 6,741	$ 10,351	$ 41
Taxi Medallion Portfolio Segment [Member] | Interest Rate Below Market Reduction [Member]
Financing Receivable, Modifications, Number of Contracts	10	12
Financing Receivable, Modifications, Balance	$ 6,741	$ 9,764
One-To-Four Family - Mixed-Use Property Portfolio Segment [Member] | Interest Rate Below Market Reduction [Member]
Financing Receivable, Modifications, Number of Contracts		2
Financing Receivable, Modifications, Balance		$ 263
Small Business Administration Portfolio Segment [Member] | Interest Rate Below Market Reduction [Member]
Financing Receivable, Modifications, Number of Contracts			1
Financing Receivable, Modifications, Balance			$ 41
Commercial Business and Other Portfolio Segment [Member] | Interest Rate Below Market Reduction [Member]
Financing Receivable, Modifications, Number of Contracts		1
Financing Receivable, Modifications, Balance		$ 324

X

- Definition

Number of financing receivables that have been modified by troubled debt restructurings.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953676-111524

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- Definition

Post-modification amount of investment in financing receivables modified by troubled debt restructurings.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953676-111524

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