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Note 5 - Loans and Allowance for Credit Losses (Details) - Recorded Investment in Loans by Impairment Method - USD ($) $ in Thousands | Jun. 30, 2015 | Dec. 31, 2014 | Jun. 30, 2014
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Recorded investment in loans: |  |  |
Individually evaluated for impairment | $ 40,960 | $ 45,310 | $ 36,991
Collectively evaluated for impairment | 4,509,937 | 4,267,089 | 3,242,438
Commercial Portfolio Segment [Member] |  |  |
Recorded investment in loans: |  |  |
Individually evaluated for impairment | 17,966 | 17,612 | 17,405
Collectively evaluated for impairment | 942,540 | 898,614 | 709,206
Income Producing Portfolio Segment [Member] |  |  |
Recorded investment in loans: |  |  |
Individually evaluated for impairment | 2,371 | 5,109 | 2,913
Collectively evaluated for impairment | 1,861,212 | 1,698,063 | 1,299,566
Owner Occupied Portfolio Segment [Member] |  |  |
Recorded investment in loans: |  |  |
Individually evaluated for impairment | 1,827 | 6,891 | 3,230
Collectively evaluated for impairment | 496,007 | 454,690 | 326,843
Residential Portfolio Segment [Member] |  |  |
Recorded investment in loans: |  |  |
Collectively evaluated for impairment | 149,842 | 148,018 | 123,587
Construction Portfolio Segment [Member] |  |  |
Recorded investment in loans: |  |  |
Individually evaluated for impairment | 17,891 | 14,241 | 12,882
Collectively evaluated for impairment | 937,860 | 837,223 | 667,750
Home Equity Portfolio Segment [Member] |  |  |
Recorded investment in loans: |  |  |
Individually evaluated for impairment | 887 | 1,398 | 561
Collectively evaluated for impairment | 117,657 | 121,138 | 108,370
Other Consumer Portfolio Segment [Member] |  |  |
Recorded investment in loans: |  |  |
Individually evaluated for impairment | 18 | 59 |
Collectively evaluated for impairment | $ 4,819 | $ 109,343 | $ 7,116

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