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Note 5 - Loans and Allowance for Credit Losses - Recorded Investment in Loans by Impairment Method (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
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Recorded investment in loans: |  |
Loans individually evaluated for impairment | $ 34,471 | $ 31,516
Loans collectively evaluated for impairment | 5,643,422 | 4,966,852
Net loans | 5,677,893 | 4,998,368
Commercial Portfolio Segment [Member] |  |
Recorded investment in loans: |  |
Loans individually evaluated for impairment | 10,437 | 13,008
Loans collectively evaluated for impairment | 1,190,291 | 1,039,249
Net loans | 1,200,728 | 1,052,257
Income Producing Portfolio Segment [Member] |  |
Recorded investment in loans: |  |
Loans individually evaluated for impairment | 15,057 | 6,118
Loans collectively evaluated for impairment | 2,494,460 | 2,109,360
Net loans | 2,509,517 | 2,115,478
Owner Occupied Portfolio Segment [Member] |  |
Recorded investment in loans: |  |
Loans individually evaluated for impairment | 2,093 | 1,753
Loans collectively evaluated for impairment | 638,777 | 496,350
Net loans | 640,870 | 498,103
Residential Portfolio Segment [Member] |  |
Recorded investment in loans: |  |
Loans individually evaluated for impairment | 241 |
Loans collectively evaluated for impairment | 152,507 | 147,365
Net loans | 152,748 | 147,365
Construction Portfolio Segment [Member] |  |
Recorded investment in loans: |  |
Loans individually evaluated for impairment | 6,517 | 10,454
Loans collectively evaluated for impairment | 1,052,052 | 1,054,922
Net loans | 1,058,569 | 1,065,376
Home Equity Portfolio Segment [Member] |  |
Recorded investment in loans: |  |
Loans individually evaluated for impairment |  | 161
Loans collectively evaluated for impairment | 105,096 | 112,724
Net loans | 105,096 | 112,885
Other Consumer Portfolio Segment [Member] |  |
Recorded investment in loans: |  |
Loans individually evaluated for impairment | 126 | 22
Loans collectively evaluated for impairment | 10,239 | 6,882
Net loans | $ 10,365 | $ 6,904

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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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