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Note 5 - Loans and Allowance for Credit Losses - Allowance for Credit Losses by Portfolio Segment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2016	Dec. 31, 2015
Balance	$ 52,687	$ 46,075
Loans charged-off	(6,340)	(8,598)
Recoveries of loans previously charged-off	1,396	572
Net loans (charged-off) recoveries	(4,944)	(8,026)
Provision for credit losses	11,331	14,638
Balance	59,074	52,687
Individually evaluated for impairment			$ 5,599	$ 5,902
Collectively evaluated for impairment			53,475	46,785
Balance	59,074	52,687	59,074	52,687
Commercial Portfolio Segment [Member]
Balance	11,563	13,222
Loans charged-off	(3,745)	(4,693)
Recoveries of loans previously charged-off	220	195
Net loans (charged-off) recoveries	(3,525)	(4,498)
Provision for credit losses	6,662	2,839
Balance	14,700	11,563
Individually evaluated for impairment			2,671	3,478
Collectively evaluated for impairment			12,029	8,085
Balance	11,563	11,563	14,700	11,563
Income Producing Portfolio Segment [Member]
Balance	14,122	11,442
Loans charged-off	(2,341)	(651)
Recoveries of loans previously charged-off	908	26
Net loans (charged-off) recoveries	(1,433)	(625)
Provision for credit losses	8,416	3,305
Balance	21,105	14,122
Individually evaluated for impairment			1,943	1,033
Collectively evaluated for impairment			19,162	13,089
Balance	14,122	14,122	21,105	14,122
Owner Occupied Portfolio Segment [Member]
Balance	3,279	2,954
Loans charged-off
Recoveries of loans previously charged-off	3	3
Net loans (charged-off) recoveries	3	3
Provision for credit losses	728	322
Balance	4,010	3,279
Individually evaluated for impairment			350	400
Collectively evaluated for impairment			3,660	2,879
Balance	3,279	3,279	4,010	3,279
Residential Portfolio Segment [Member]
Balance	1,268	1,259
Loans charged-off
Recoveries of loans previously charged-off	7	7
Net loans (charged-off) recoveries	7	7
Provision for credit losses	9	2
Balance	1,284	1,268
Individually evaluated for impairment
Collectively evaluated for impairment			1,284	1,268
Balance	1,268	1,268	1,284	1,268
Construction Portfolio Segment [Member]
Balance	21,088	15,625
Loans charged-off		(1,884)
Recoveries of loans previously charged-off	215	206
Net loans (charged-off) recoveries	215	(1,678)
Provision for credit losses	(4,816)	7,141
Balance	16,487	21,088
Individually evaluated for impairment			522	950
Collectively evaluated for impairment			15,965	20,138
Balance	21,088	21,088	16,487	21,088
Home Equity Portfolio Segment [Member]
Balance	1,292	1,469
Loans charged-off	(217)	(1,142)
Recoveries of loans previously charged-off	12	25
Net loans (charged-off) recoveries	(205)	(1,117)
Provision for credit losses	241	940
Balance	1,328	1,292
Individually evaluated for impairment				38
Collectively evaluated for impairment			1,328	1,254
Balance	1,292	1,292	1,328	1,292
Other Consumer Portfolio Segment [Member]
Balance	75	104
Loans charged-off	(37)	(228)
Recoveries of loans previously charged-off	31	110
Net loans (charged-off) recoveries	(6)	(118)
Provision for credit losses	91	89
Balance	160	75
Individually evaluated for impairment			113	3
Collectively evaluated for impairment			47	72
Balance	$ 75	$ 75	$ 160	$ 75

X

- Definition

Amount of recovery of loans and lease receivables which had previously been fully or partially written-off as bad debts.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (c)(4)
-URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953423-111524

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X

- Definition

Amount of other addition (reduction) in allowance reserve for credit loss.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
-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 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.7(d))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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- Definition

Amount of loans and leases that have been written off from both loan receivables and allowance reserve for credit loss.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (c)(3)
-URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953423-111524

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
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X

- Definition

The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953423-111524

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- Definition

Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953423-111524

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X

- Definition

Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953423-111524

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.7(d))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 4: http://www.xbrl.org/2003/role/presentationRef
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-Section S99
-Paragraph 4
-Subparagraph (SAB Topic 6.L.1)
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
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X

- Definition

Amount of expense related to estimated loss from loan and lease transactions.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 225
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04.11)
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