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Note 5 - Loans and Allowance for Loan Losses - Troubled Debt Restructurings That Are Performing According to Their Restructured Terms (Details) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2018 USD ($)	Mar. 31, 2017	Dec. 31, 2017 USD ($)
Financing Receivable, Modifications, Number of Contracts	0	0
Performing Financial Instruments [Member]
Financing Receivable, Modifications, Number of Contracts	38		41
Recorded investment	$ 10,929		$ 13,207
Multi-Family Residential [Member] | Performing Financial Instruments [Member]
Financing Receivable, Modifications, Number of Contracts	9		9
Recorded investment	$ 2,503		$ 2,518
Commercial Real Estate Loans [Member] | Performing Financial Instruments [Member]
Financing Receivable, Modifications, Number of Contracts			2
Recorded investment			$ 1,986
One-To-Four Family - Mixed Used Property [Member] | Performing Financial Instruments [Member]
Financing Receivable, Modifications, Number of Contracts	5		5
Recorded investment	$ 1,740		$ 1,753
One-To-Four Family - Residential [Member] | Performing Financial Instruments [Member]
Financing Receivable, Modifications, Number of Contracts	3		3
Recorded investment	$ 567		$ 572
Taxi Medallion Portfolio Segment [Member] | Performing Financial Instruments [Member]
Financing Receivable, Modifications, Number of Contracts	19		20
Recorded investment	$ 5,712		$ 5,916
Commercial Business and Other [Member] | Performing Financial Instruments [Member]
Financing Receivable, Modifications, Number of Contracts	2		2
Recorded investment	$ 407		$ 462

X

- Definition

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-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

The amount of the outstanding recorded investment related to financing receivables that have been modified by troubled debt restructurings.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 40
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=82895541&loc=d3e18845-111554

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