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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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- 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 + Details
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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 + Details
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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 + Details
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