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Note 5 - Loans - Average Balance and Interest Income Recognized Related to Impaired Loans (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Average Recorded Investment | $ 131,019 | $ 162,945 | $ 190,226
Contractual interest due | 3,462 | 3,997 | 5,339
Commercial Portfolio Segment [Member] |  |  |
Average Recorded Investment | 21,199 | 23,960 | 26,128
Contractual interest due | 767 | 546 | 878
Real Estate Construction Portfolio Segment [Member] |  |  |
Average Recorded Investment | 10,362 | 22,066 | 32,439
Contractual interest due |  | 261 | 264
Commercial Real Estate Portfolio Segment [Member] |  |  |
Average Recorded Investment | 81,905 | 100,118 | 114,248
Contractual interest due | 2,214 | 2,708 | 3,735
Residential Mortgage and Equity Lines Portfolio Segment [Member] |  |  |
Average Recorded Investment | 17,553 | 16,801 | 17,411
Contractual interest due | $ 481 | $ 482 | $ 462

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- Definition Average amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=66008989&loc=d3e5212-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=66008989&loc=d3e5258-111524 + Details
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- Definition Amount of interest income recognized that the financing receivables (with related allowance for credit losses and without a related allowance for credit losses) were impaired. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=66008989&loc=d3e5212-111524 + Details
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