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Note 3 - Loans Receivable and Allowance for Loan Losses - Impaired Loans (Additional Information) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Impaired loans with no related allowance recorded, average recorded investment	$ 8,687	$ 12,358
Impaired loans with no allowance recorded, interest income recognized	81	127
Impaired loans with a related allowance recorded, average recorded investment	231	2,979
Impaired loans with a related allowance recorded, interest income recognized
Impaired loans, average recorded investment	8,918	15,337
Impaired loans, interest income recognized	81	127
Commercial Real Estate Portfolio Segment [Member]
Impaired loans with no related allowance recorded, average recorded investment	6,236	7,270
Impaired loans with no allowance recorded, interest income recognized	73	91
Impaired loans with a related allowance recorded, average recorded investment
Impaired loans with a related allowance recorded, interest income recognized
Impaired loans, average recorded investment	6,236	7,270
Impaired loans, interest income recognized	73	91
Residential Portfolio Segment [Member]
Impaired loans with no related allowance recorded, average recorded investment	1,910	4,542
Impaired loans with no allowance recorded, interest income recognized	3	31
Impaired loans with a related allowance recorded, average recorded investment
Impaired loans with a related allowance recorded, interest income recognized
Impaired loans, average recorded investment	1,910	4,542
Impaired loans, interest income recognized	3	31
Commercial Portfolio Segment [Member]
Impaired loans with no related allowance recorded, average recorded investment
Impaired loans with no allowance recorded, interest income recognized
Impaired loans with a related allowance recorded, average recorded investment	231	2,977
Impaired loans with a related allowance recorded, interest income recognized
Impaired loans, average recorded investment	231	2,977
Impaired loans, interest income recognized
Consumer Portfolio Segment [Member]
Impaired loans with no related allowance recorded, average recorded investment	541	546
Impaired loans with no allowance recorded, interest income recognized	5	5
Impaired loans with a related allowance recorded, average recorded investment		2
Impaired loans with a related allowance recorded, interest income recognized
Impaired loans, average recorded investment	541	548
Impaired loans, interest income recognized	$ 5	$ 5

X

- Definition

Average amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5212-111524

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 17
-URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5258-111524

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X

- Definition

Amount of interest income recognized that the financing receivables (with related allowance for credit losses and without a related allowance for credit losses) were impaired.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (c)(2)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5212-111524

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X

- Definition

Amount of average investment of impaired financing receivables for which there is no related allowance for credit losses.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 17
-URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5258-111524

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5212-111524

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- Definition

Amount of interest income, recognized on accrual basis, on financing receivables that are recognized as impaired, for which there is no related allowance for credit losses.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (c)(2)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5212-111524

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- Definition

Amount of average investment of impaired financing receivables for which there is a related allowance for credit losses.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5212-111524

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 17
-URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5258-111524

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- Definition

Amount of interest income, recognized on accrual basis, on financing receivables, for which there is a related allowance for credit losses and are recognized as impaired.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (c)(2)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5212-111524

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