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Note 5 - Loans (Details) - Average Balance and Interest Income Recognized Related to Impaired Loans - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Financing Receivable, Impaired [Line Items] |  |  |
Loans, average recorded investment | $ 162,945 | $ 190,226 | $ 221,152
Loans, interest income recognized | 3,997 | 5,339 | 5,599
Commercial Portfolio Segment [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Loans, average recorded investment | 23,960 | 26,128 | 27,123
Loans, interest income recognized | 546 | 878 | 770
Real Estate Construction Portfolio Segment [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Loans, average recorded investment | 22,066 | 32,439 | 37,875
Loans, interest income recognized | 261 | 264 | 284
Commercial Real Estate Portfolio Segment [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Loans, average recorded investment | 100,118 | 114,248 | 138,121
Loans, interest income recognized | 2,708 | 3,735 | 4,256
Residential Mortgage and Equity Lines Portfolio Segment [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Loans, average recorded investment | 16,801 | 17,411 | 18,033
Loans, interest income recognized | $ 482 | $ 462 | $ 289

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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=49124121&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=49124121&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=49124121&loc=d3e5212-111524 + Details
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