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Note 5 - Loans and Allowance for Credit Losses - Allowance for Credit Losses by Portfolio Segment (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Commercial Portfolio Segment [Member]
Balance at beginning of period	$ 11,563	$ 13,222
Loans charged-off	(805)	(998)
Recoveries of loans previously charged-off	72	51
Net loans (charged-off) recoveries	(733)	(947)
Provision for credit losses	2,792	1,502
Ending balance	13,622	13,777
Individually evaluated for impairment	2,922	5,771
Collectively evaluated for impairment	10,700	8,006
Ending balance		13,777
Income Producing Portfolio Segment [Member]
Balance at beginning of period	14,122	11,442
Loans charged-off	(590)	$ (318)
Recoveries of loans previously charged-off	4
Net loans (charged-off) recoveries	(586)	$ (318)
Provision for credit losses	2,258	528
Ending balance	15,794	11,652
Individually evaluated for impairment	868	568
Collectively evaluated for impairment	14,926	11,084
Ending balance		11,652
Owner Occupied Portfolio Segment [Member]
Balance at beginning of period	$ 3,279	$ 2,954
Loans charged-off
Recoveries of loans previously charged-off	$ 1	$ 1
Net loans (charged-off) recoveries	1	1
Provision for credit losses	651	172
Ending balance	3,931	3,127
Individually evaluated for impairment	360	400
Collectively evaluated for impairment	3,571	2,727
Ending balance		3,127
Residential Portfolio Segment [Member]
Balance at beginning of period	$ 1,268	$ 1,259
Loans charged-off
Recoveries of loans previously charged-off	$ 2	$ 2
Net loans (charged-off) recoveries	2	2
Provision for credit losses	(219)	(206)
Ending balance	$ 1,051	$ 1,055
Individually evaluated for impairment
Collectively evaluated for impairment	$ 1,051	$ 1,055
Ending balance		1,055
Construction Portfolio Segment [Member]
Balance at beginning of period	$ 21,088	$ 15,625
Loans charged-off
Recoveries of loans previously charged-off	$ 196	$ 95
Net loans (charged-off) recoveries	196	95
Provision for credit losses	(2,818)	663
Ending balance	18,466	16,383
Individually evaluated for impairment	310	550
Collectively evaluated for impairment	18,156	15,833
Ending balance		16,383
Home Equity Portfolio Segment [Member]
Balance at beginning of period	1,292	1,469
Loans charged-off	(4)	(419)
Recoveries of loans previously charged-off	1	2
Net loans (charged-off) recoveries	(3)	(417)
Provision for credit losses	194	457
Ending balance	1,483	1,509
Individually evaluated for impairment	88	289
Collectively evaluated for impairment	1,395	1,220
Ending balance		1,509
Other Consumer Portfolio Segment [Member]
Balance at beginning of period	75	104
Loans charged-off	(7)	(71)
Recoveries of loans previously charged-off	8	49
Net loans (charged-off) recoveries	1	(22)
Provision for credit losses	185	194
Ending balance	$ 261	276
Individually evaluated for impairment		5
Collectively evaluated for impairment	$ 261	271
Ending balance		276
Balance at beginning of period	52,687	46,075
Loans charged-off	(1,406)	(1,806)
Recoveries of loans previously charged-off	284	200
Net loans (charged-off) recoveries	(1,122)	(1,606)
Provision for credit losses	3,043	3,310
Ending balance	54,608	47,779
Individually evaluated for impairment	4,548	7,583
Collectively evaluated for impairment	50,060	40,196
Ending balance	$ 54,608	$ 47,779

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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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

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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X

- 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
-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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X

- Definition

A valuation allowance for financing receivables that are expected to be uncollectible.

+ 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)(1)
-URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953423-111524

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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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X

- 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
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953423-111524

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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section S99
-Paragraph 4
-Subparagraph (SAB Topic 6.L.1)
-URI http://asc.fasb.org/extlink&oid=27010918&loc=d3e74567-122707

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (b)(1)(ii)
-URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544

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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)
-URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
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-Section 45
-Paragraph 28
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (c)(2)
-URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953423-111524

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