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Note 5 - Loans and Allowance for Credit Losses (Details) - Recorded Investment in Loans by Impairment Method - USD ($) $ in Thousands | Sep. 30, 2015 | Dec. 31, 2014 | Sep. 30, 2014
--- | --- | --- | ---
Recorded investment in loans: |  |  |
Individually evaluated for impairment | $ 39,913 | $ 45,310 | $ 43,773
Collectively evaluated for impairment | 4,737,052 | 4,267,089 | 3,388,775
Ending balance | 4,776,965 | 4,312,399 | 3,432,548
Commercial Portfolio Segment [Member] |  |  |
Recorded investment in loans: |  |  |
Individually evaluated for impairment | 12,869 | 17,612 | 17,785
Collectively evaluated for impairment | 994,790 | 898,614 | 780,704
Ending balance | 1,007,659 | 916,226 | 798,489
Income Producing Portfolio Segment [Member] |  |  |
Recorded investment in loans: |  |  |
Individually evaluated for impairment | 6,877 | 5,109 | 2,710
Collectively evaluated for impairment | 2,016,073 | 1,698,063 | 1,380,129
Ending balance | 2,022,950 | 1,703,172 | 1,382,839
Owner Occupied Portfolio Segment [Member] |  |  |
Recorded investment in loans: |  |  |
Individually evaluated for impairment | 1,790 | 6,891 | 5,054
Collectively evaluated for impairment | 487,867 | 454,690 | 332,368
Ending balance | 489,657 | 461,581 | 337,422
Residential Portfolio Segment [Member] |  |  |
Recorded investment in loans: |  |  |
Collectively evaluated for impairment | 147,720 | 148,018 | 126,263
Ending balance | 147,720 | 148,018 | 126,263
Construction Portfolio Segment [Member] |  |  |
Recorded investment in loans: |  |  |
Individually evaluated for impairment | 17,644 | 14,241 | 17,479
Collectively evaluated for impairment | 970,108 | 837,223 | 659,103
Ending balance | 987,752 | 851,464 | 676,582
Home Equity Portfolio Segment [Member] |  |  |
Recorded investment in loans: |  |  |
Individually evaluated for impairment | 661 | 1,398 | 745
Collectively evaluated for impairment | 114,685 | 121,138 | 106,546
Ending balance | 115,346 | 122,536 | 107,291
Other Consumer Portfolio Segment [Member] |  |  |
Recorded investment in loans: |  |  |
Individually evaluated for impairment | 72 | 59 |
Collectively evaluated for impairment | 5,809 | 109,343 | 3,662
Ending balance | $ 5,881 | $ 109,402 | $ 3,662

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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=49124121&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=49124121&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=28367877&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=49124121&loc=d3e5074-111524 + Details
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