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Note 5 - Loans Receivable and Allowance for Loan Losses - Non-accrual Loans (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Business Activities Loans [Member]
Non-accruing loans	$ 6,479	$ 3,778
Commercial Real Estate Portfolio Segment [Member] | Business Activities Loans [Member]
Non-accruing loans	2,073
Residential Portfolio Segment [Member] | Business Activities Loans [Member]
Non-accruing loans	3,223	3,028
Commercial Portfolio Segment [Member] | Business Activities Loans [Member]
Non-accruing loans	1,084	748
Consumer Portfolio Segment [Member] | Business Activities Loans [Member]
Non-accruing loans	99	2
Substandard [Member] | Business Activities Loans [Member]
Non-accruing loans	6,479
Substandard [Member] | Acquired Loans [Member]
Non-accruing loans		3,778
Substandard [Member] | Commercial Real Estate Portfolio Segment [Member] | Business Activities Loans [Member]
Non-accruing loans	2,073
Substandard [Member] | Commercial Real Estate Portfolio Segment [Member] | Acquired Loans [Member]
Non-accruing loans		3,028
Substandard [Member] | Residential Portfolio Segment [Member] | Business Activities Loans [Member]
Non-accruing loans	3,223	3,028
Substandard [Member] | Commercial Portfolio Segment [Member] | Business Activities Loans [Member]
Non-accruing loans	1,084	748
Substandard [Member] | Commercial Portfolio Segment [Member] | Acquired Loans [Member]
Non-accruing loans		748
Substandard [Member] | Consumer Portfolio Segment [Member] | Business Activities Loans [Member]
Non-accruing loans	99	2
Substandard [Member] | Consumer Portfolio Segment [Member] | Acquired Loans [Member]
Non-accruing loans		2
Substandard [Member] | Non-Accrual Loans [Member] | Business Activities Loans [Member]
Performing (accruing) loans, past due	6,479
Performing (accruing) loans, current	0
Substandard [Member] | Non-Accrual Loans [Member] | Acquired Loans [Member]
Performing (accruing) loans, past due		3,778
Performing (accruing) loans, current		0
Substandard [Member] | Non-Accrual Loans [Member] | Commercial Real Estate Portfolio Segment [Member] | Business Activities Loans [Member]
Performing (accruing) loans, past due	2,073
Performing (accruing) loans, current	0
Substandard [Member] | Non-Accrual Loans [Member] | Commercial Real Estate Portfolio Segment [Member] | Acquired Loans [Member]
Performing (accruing) loans, past due		3,028
Performing (accruing) loans, current		0
Substandard [Member] | Non-Accrual Loans [Member] | Residential Portfolio Segment [Member] | Business Activities Loans [Member]
Performing (accruing) loans, past due	3,223
Performing (accruing) loans, current	0
Substandard [Member] | Non-Accrual Loans [Member] | Commercial Portfolio Segment [Member] | Business Activities Loans [Member]
Performing (accruing) loans, past due	1,084
Performing (accruing) loans, current	0
Substandard [Member] | Non-Accrual Loans [Member] | Commercial Portfolio Segment [Member] | Acquired Loans [Member]
Performing (accruing) loans, past due		748
Performing (accruing) loans, current		0
Substandard [Member] | Non-Accrual Loans [Member] | Consumer Portfolio Segment [Member] | Business Activities Loans [Member]
Performing (accruing) loans, past due	99
Performing (accruing) loans, current	0
Substandard [Member] | Non-Accrual Loans [Member] | Consumer Portfolio Segment [Member] | Acquired Loans [Member]
Performing (accruing) loans, past due		2
Performing (accruing) loans, current		0
Financing Receivables, 30 to 59 Days Past Due [Member] | Substandard [Member] | Non-Accrual Loans [Member] | Business Activities Loans [Member]
Performing (accruing) loans, past due	0
Financing Receivables, 30 to 59 Days Past Due [Member] | Substandard [Member] | Non-Accrual Loans [Member] | Acquired Loans [Member]
Performing (accruing) loans, past due		0
Financing Receivables, 30 to 59 Days Past Due [Member] | Substandard [Member] | Non-Accrual Loans [Member] | Commercial Real Estate Portfolio Segment [Member] | Business Activities Loans [Member]
Performing (accruing) loans, past due	0
Financing Receivables, 30 to 59 Days Past Due [Member] | Substandard [Member] | Non-Accrual Loans [Member] | Commercial Real Estate Portfolio Segment [Member] | Acquired Loans [Member]
Performing (accruing) loans, past due		0
Financing Receivables, 30 to 59 Days Past Due [Member] | Substandard [Member] | Non-Accrual Loans [Member] | Residential Portfolio Segment [Member] | Business Activities Loans [Member]
Performing (accruing) loans, past due	0
Financing Receivables, 30 to 59 Days Past Due [Member] | Substandard [Member] | Non-Accrual Loans [Member] | Commercial Portfolio Segment [Member] | Business Activities Loans [Member]
Performing (accruing) loans, past due	0
Financing Receivables, 30 to 59 Days Past Due [Member] | Substandard [Member] | Non-Accrual Loans [Member] | Commercial Portfolio Segment [Member] | Acquired Loans [Member]
Performing (accruing) loans, past due		0
Financing Receivables, 30 to 59 Days Past Due [Member] | Substandard [Member] | Non-Accrual Loans [Member] | Consumer Portfolio Segment [Member] | Business Activities Loans [Member]
Performing (accruing) loans, past due	0
Financing Receivables, 30 to 59 Days Past Due [Member] | Substandard [Member] | Non-Accrual Loans [Member] | Consumer Portfolio Segment [Member] | Acquired Loans [Member]
Performing (accruing) loans, past due		0
Financing Receivables, 60 to 89 Days Past Due [Member] | Substandard [Member] | Non-Accrual Loans [Member] | Business Activities Loans [Member]
Performing (accruing) loans, past due
Financing Receivables, 60 to 89 Days Past Due [Member] | Substandard [Member] | Non-Accrual Loans [Member] | Acquired Loans [Member]
Performing (accruing) loans, past due
Financing Receivables, 60 to 89 Days Past Due [Member] | Substandard [Member] | Non-Accrual Loans [Member] | Commercial Real Estate Portfolio Segment [Member] | Business Activities Loans [Member]
Performing (accruing) loans, past due	0
Financing Receivables, 60 to 89 Days Past Due [Member] | Substandard [Member] | Non-Accrual Loans [Member] | Commercial Real Estate Portfolio Segment [Member] | Acquired Loans [Member]
Performing (accruing) loans, past due		0
Financing Receivables, 60 to 89 Days Past Due [Member] | Substandard [Member] | Non-Accrual Loans [Member] | Residential Portfolio Segment [Member] | Business Activities Loans [Member]
Performing (accruing) loans, past due	0
Financing Receivables, 60 to 89 Days Past Due [Member] | Substandard [Member] | Non-Accrual Loans [Member] | Commercial Portfolio Segment [Member] | Business Activities Loans [Member]
Performing (accruing) loans, past due
Financing Receivables, 60 to 89 Days Past Due [Member] | Substandard [Member] | Non-Accrual Loans [Member] | Commercial Portfolio Segment [Member] | Acquired Loans [Member]
Performing (accruing) loans, past due		0
Financing Receivables, 60 to 89 Days Past Due [Member] | Substandard [Member] | Non-Accrual Loans [Member] | Consumer Portfolio Segment [Member] | Business Activities Loans [Member]
Performing (accruing) loans, past due
Financing Receivables, 60 to 89 Days Past Due [Member] | Substandard [Member] | Non-Accrual Loans [Member] | Consumer Portfolio Segment [Member] | Acquired Loans [Member]
Performing (accruing) loans, past due
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Substandard [Member] | Non-Accrual Loans [Member] | Business Activities Loans [Member]
Performing (accruing) loans, past due	6,479
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Substandard [Member] | Non-Accrual Loans [Member] | Acquired Loans [Member]
Performing (accruing) loans, past due		3,778
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Substandard [Member] | Non-Accrual Loans [Member] | Commercial Real Estate Portfolio Segment [Member] | Business Activities Loans [Member]
Performing (accruing) loans, past due	2,073
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Substandard [Member] | Non-Accrual Loans [Member] | Commercial Real Estate Portfolio Segment [Member] | Acquired Loans [Member]
Performing (accruing) loans, past due		3,028
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Substandard [Member] | Non-Accrual Loans [Member] | Residential Portfolio Segment [Member] | Business Activities Loans [Member]
Performing (accruing) loans, past due	3,223
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Substandard [Member] | Non-Accrual Loans [Member] | Commercial Portfolio Segment [Member] | Business Activities Loans [Member]
Performing (accruing) loans, past due	1,084
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Substandard [Member] | Non-Accrual Loans [Member] | Commercial Portfolio Segment [Member] | Acquired Loans [Member]
Performing (accruing) loans, past due		748
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Substandard [Member] | Non-Accrual Loans [Member] | Consumer Portfolio Segment [Member] | Business Activities Loans [Member]
Performing (accruing) loans, past due	$ 99
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Substandard [Member] | Non-Accrual Loans [Member] | Consumer Portfolio Segment [Member] | Acquired Loans [Member]
Performing (accruing) loans, past due		$ 2

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- Definition

Financing receivables that are current.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Topic 310
-SubTopic 10
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-Paragraph 7A
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