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Note 5 - Loans and Allowance for Credit Losses - Impaired Loans (Details) - USD ($)	3 Months Ended		6 Months Ended	12 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Dec. 31, 2015
Commercial Portfolio Segment [Member] | Quarter to Date [Member]
Average Recorded Investment Quarter To Date	$ 12,782,000	$ 10,606,000		$ 9,340,000
Impaired Financing Receivable, Interest Income, Accrual Method	42,000	9,000		21,000
Commercial Portfolio Segment [Member] | Year to Date [Member]
Average Recorded Investment Quarter To Date	12,747,000	11,396,000		9,973,000
Impaired Financing Receivable, Interest Income, Accrual Method	58,000	9,000		69,000
Commercial Portfolio Segment [Member]
Unpaid Contractual Principal Balance	17,471,000	20,959,000	$ 17,471,000	16,123,000
Recorded Investment With No Allowance	150,000	9,569,000	150,000	2,396,000
Recorded Investment With Allowance	12,252,000	8,397,000	12,252,000	10,283,000
Total Recorded Investment	12,402,000	17,966,000	12,402,000	12,679,000
Related Allowance	2,634,000	4,066,000	2,634,000	3,478,000
Income Producing Portfolio Segment [Member] | Quarter to Date [Member]
Average Recorded Investment Quarter To Date	19,842,000	9,914,000		10,675,000
Impaired Financing Receivable, Interest Income, Accrual Method	58,000	36,000		95,000
Income Producing Portfolio Segment [Member] | Year to Date [Member]
Average Recorded Investment Quarter To Date	15,267,000	10,107,000		10,294,000
Impaired Financing Receivable, Interest Income, Accrual Method	116,000	71,000		354,000
Income Producing Portfolio Segment [Member]
Unpaid Contractual Principal Balance	19,778,000	3,064,000	19,778,000	6,811,000
Recorded Investment With No Allowance		1,231,000		1,190,000
Recorded Investment With Allowance	19,778,000	1,140,000	19,778,000	4,928,000
Total Recorded Investment	19,778,000	2,371,000	19,778,000	6,118,000
Related Allowance	1,697,000	491,000	1,697,000	1,033,000
Owner Occupied Portfolio Segment [Member] | Quarter to Date [Member]
Average Recorded Investment Quarter To Date	1,712,000	1,849,000		1,772,000
Impaired Financing Receivable, Interest Income, Accrual Method
Owner Occupied Portfolio Segment [Member] | Year to Date [Member]
Average Recorded Investment Quarter To Date	1,725,000	1,862,000		1,810,000
Impaired Financing Receivable, Interest Income, Accrual Method
Owner Occupied Portfolio Segment [Member]
Unpaid Contractual Principal Balance	1,699,000	1,827,000	1,699,000	1,753,000
Recorded Investment With No Allowance		998,000		946,000
Recorded Investment With Allowance	1,699,000	829,000	1,699,000	807,000
Total Recorded Investment	1,699,000	1,827,000	1,699,000	1,753,000
Related Allowance	450,000	386,000	450,000	400,000
Residential Portfolio Segment [Member] | Quarter to Date [Member]
Average Recorded Investment Quarter To Date	256,000	7,496,000		331,000
Impaired Financing Receivable, Interest Income, Accrual Method		99,000
Residential Portfolio Segment [Member] | Year to Date [Member]
Average Recorded Investment Quarter To Date	280,000	8,041,000		336,000
Impaired Financing Receivable, Interest Income, Accrual Method		198,000
Residential Portfolio Segment [Member]
Unpaid Contractual Principal Balance	254,000	17,891,000	254,000	329,000
Recorded Investment With No Allowance	254,000	12,250,000	254,000	329,000
Recorded Investment With Allowance		5,641,000
Total Recorded Investment	254,000	17,891,000	254,000	329,000
Related Allowance		803,000
Construction Portfolio Segment [Member] | Quarter to Date [Member]
Average Recorded Investment Quarter To Date	5,418,000			8,031,000
Impaired Financing Receivable, Interest Income, Accrual Method				(93,000)
Construction Portfolio Segment [Member] | Year to Date [Member]
Average Recorded Investment Quarter To Date	7,096,000			7,594,000
Impaired Financing Receivable, Interest Income, Accrual Method				205,000
Construction Portfolio Segment [Member]
Unpaid Contractual Principal Balance	5,413,000		5,413,000	10,454,000
Recorded Investment With No Allowance	4,871,000		4,871,000	4,877,000
Recorded Investment With Allowance	542,000		542,000	5,577,000
Total Recorded Investment	5,413,000		5,413,000	10,454,000
Related Allowance	350,000		350,000	950,000
Home Equity Portfolio Segment [Member] | Quarter to Date [Member]
Average Recorded Investment Quarter To Date	122,000	888,000		411,000
Impaired Financing Receivable, Interest Income, Accrual Method
Home Equity Portfolio Segment [Member] | Year to Date [Member]
Average Recorded Investment Quarter To Date	135,000	1,058,000		650,000
Impaired Financing Receivable, Interest Income, Accrual Method
Home Equity Portfolio Segment [Member]
Unpaid Contractual Principal Balance	121,000	887,000	121,000	161,000
Recorded Investment With No Allowance		117,000		116,000
Recorded Investment With Allowance	121,000	770,000	121,000	45,000
Total Recorded Investment	121,000	887,000	121,000	161,000
Related Allowance	88,000	293,000	88,000	38,000
Other Consumer Portfolio Segment [Member] | Quarter to Date [Member]
Average Recorded Investment Quarter To Date		14,000		47,000
Impaired Financing Receivable, Interest Income, Accrual Method		1,000		(1,000)
Other Consumer Portfolio Segment [Member] | Year to Date [Member]
Average Recorded Investment Quarter To Date	7,000	29,000		31,000
Impaired Financing Receivable, Interest Income, Accrual Method		1,000		1,000
Other Consumer Portfolio Segment [Member]
Unpaid Contractual Principal Balance		18,000		22,000
Recorded Investment With No Allowance		18,000		19,000
Recorded Investment With Allowance				3,000
Total Recorded Investment		18,000		22,000
Related Allowance				3,000
Quarter to Date [Member]
Average Recorded Investment Quarter To Date	40,132,000	30,767,000		30,607,000
Impaired Financing Receivable, Interest Income, Accrual Method	100,000	145,000		22,000
Year to Date [Member]
Average Recorded Investment Quarter To Date	37,257,000	32,493,000		30,688,000
Impaired Financing Receivable, Interest Income, Accrual Method	174,000	279,000		629,000
Unpaid Contractual Principal Balance	44,736,000	44,646,000	44,736,000	35,653,000
Recorded Investment With No Allowance	5,275,000	24,183,000	5,275,000	9,873,000
Recorded Investment With Allowance	34,392,000	16,777,000	34,392,000	21,643,000
Total Recorded Investment	39,667,000	40,960,000	39,667,000	31,516,000
Related Allowance	$ 5,219,000	$ 6,039,000	5,219,000	$ 5,902,000
Impaired Financing Receivable, Interest Income, Accrual Method			$ 174,000

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=66008989&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=66008989&loc=d3e5258-111524

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
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+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
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-Section 50
-Paragraph 14A
-Subparagraph (b)
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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Recorded Investment
-URI http://asc.fasb.org/extlink&oid=65880944

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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-Topic 310
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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
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