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Note 5 - Loans and Allowance for Credit Losses - Recorded Investment in Loans by Impairment Method (Details) - USD ($) $ in Thousands | Sep. 30, 2016 | Dec. 31, 2015 | Sep. 30, 2015
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Commercial Portfolio Segment [Member] |  |  |
Recorded investment in loans: |  |  |
Loans individually evaluated for impairment | $ 12,448 | $ 13,008 | $ 12,869
Loans collectively evaluated for impairment | 1,117,594 | 1,039,249 | 994,790
Net loans | 1,130,042 | 1,052,257 | 1,007,659
Income Producing Portfolio Segment [Member] |  |  |
Recorded investment in loans: |  |  |
Loans individually evaluated for impairment | 14,648 | 6,118 | 6,877
Loans collectively evaluated for impairment | 2,536,538 | 2,109,360 | 2,016,073
Net loans | 2,551,186 | 2,115,478 | 2,022,950
Owner Occupied Portfolio Segment [Member] |  |  |
Recorded investment in loans: |  |  |
Loans individually evaluated for impairment | 2,517 | 1,753 | 1,790
Loans collectively evaluated for impairment | 587,910 | 496,350 | 487,867
Net loans | 590,427 | 498,103 | 489,657
Residential Portfolio Segment [Member] |  |  |
Recorded investment in loans: |  |  |
Loans individually evaluated for impairment | 244 |  |
Loans collectively evaluated for impairment | 154,195 | 147,365 | 147,720
Net loans | 154,439 | 147,365 | 147,720
Construction Portfolio Segment [Member] |  |  |
Recorded investment in loans: |  |  |
Loans individually evaluated for impairment | 4,878 | 10,454 | 17,644
Loans collectively evaluated for impairment | 937,935 | 1,054,922 | 970,108
Net loans | 942,813 | 1,065,376 | 987,752
Home Equity Portfolio Segment [Member] |  |  |
Recorded investment in loans: |  |  |
Loans individually evaluated for impairment | 113 | 161 | 661
Loans collectively evaluated for impairment | 106,743 | 112,724 | 114,685
Net loans | 106,856 | 112,885 | 115,346
Other Consumer Portfolio Segment [Member] |  |  |
Recorded investment in loans: |  |  |
Loans individually evaluated for impairment |  | 22 | 72
Loans collectively evaluated for impairment | 6,212 | 6,882 | 5,809
Net loans | 6,212 | 6,904 | 5,881
Loans individually evaluated for impairment | 34,848 | 31,516 | 39,913
Loans collectively evaluated for impairment | 5,447,127 | 4,966,852 | 4,737,052
Net loans | $ 5,481,975 | $ 4,998,368 | $ 4,776,965

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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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