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Note 5 - Loans and Allowance for Credit Losses - Recorded Investment in Loans by Impairment Method (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015	Mar. 31, 2015
Commercial Portfolio Segment [Member]
Recorded investment in loans:
Individually evaluated for impairment	$ 13,161	$ 13,008	$ 16,981
Collectively evaluated for impairment	1,046,886	1,039,249	916,734
Loans, amount	1,060,047	1,052,257	933,715
Income Producing Portfolio Segment [Member]
Recorded investment in loans:
Individually evaluated for impairment	19,905	6,118	4,601
Collectively evaluated for impairment	2,118,186	2,109,360	1,734,882
Loans, amount	2,138,091	2,115,478	1,739,483
Owner Occupied Portfolio Segment [Member]
Recorded investment in loans:
Individually evaluated for impairment	1,724	1,753	6,840
Collectively evaluated for impairment	568,191	496,350	486,163
Loans, amount	569,915	$ 498,103	$ 493,003
Residential Portfolio Segment [Member]
Recorded investment in loans:
Individually evaluated for impairment	257
Collectively evaluated for impairment	148,902	$ 147,365	$ 147,871
Loans, amount	149,159	147,365	147,871
Construction Portfolio Segment [Member]
Recorded investment in loans:
Individually evaluated for impairment	5,422	10,454	14,000
Collectively evaluated for impairment	1,116,591	1,054,922	897,571
Loans, amount	1,122,013	1,065,376	911,571
Home Equity Portfolio Segment [Member]
Recorded investment in loans:
Individually evaluated for impairment	122	161	889
Collectively evaluated for impairment	110,863	112,724	119,654
Loans, amount	$ 110,985	112,885	120,543
Other Consumer Portfolio Segment [Member]
Recorded investment in loans:
Individually evaluated for impairment		22	10
Collectively evaluated for impairment	$ 5,661	6,882	98,697
Loans, amount	5,661	6,904	98,707
Individually evaluated for impairment	40,591	31,516	43,321
Collectively evaluated for impairment	5,115,280	4,966,852	4,401,572
Loans, amount	$ 5,155,871	$ 4,998,368	$ 4,444,893

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- References

No definition available.

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- Definition

The balance of financing receivables 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 (h)
-URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953423-111524

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- Definition

The balance of financing receivables 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 (h)
-URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953423-111524

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- Definition

Amount before allowance and after deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes 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 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=65884687&loc=d3e4428-111522

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=66008989&loc=d3e5074-111524

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