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Note 3 - Loans and Allowance for Loan Losses - Troubled Debt Restructurings That Are Not Performing According to Their Restructured Terms (Details) - Nonperforming Financial Instruments [Member] $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Number of contracts	2	1
Recorded investment	$ 1,785	$ 383
Multi-family Residential Portfolio Segment [Member]
Number of contracts	1	1
Recorded investment	$ 388	$ 383
Commercial Business and Other Portfolio Segment [Member]
Number of contracts	1
Recorded investment	$ 1,397

X

- Definition

Number of financing receivables that have been modified by troubled debt restructurings within the previous 12 months and for which there was a payment default.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 34
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953682-111524

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X

- Definition

Amount of investment related to financing receivables modified by troubled debt restructurings within the previous 12 months, for which there was a payment default.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 34
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953682-111524

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Period Type:	duration

X

- Details

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X

- Details

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X

- Details

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