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Note 8 - Loans (Details) - Impaired Loans and Related Allowance for Credit Losses - USD ($) $ in Thousands | Sep. 30, 2015 | Dec. 31, 2014
--- | --- | ---
With no allocated allowance |  |
Loans with no related allowance, unpaid principal balance | $ 140,350 | $ 132,395
Loans with no related allowance, recorded investment | 107,819 | 113,167
With allocated allowance |  |
Loans with related allowance, unpaid principal balance | 58,365 | 78,225
Loans with related allowance, recorded investment | 53,303 | 61,352
Allowance | 14,323 | 11,798
Total impaired loans | 198,715 | 210,620
Total impaired loans | 161,122 | 174,519
Total impaired loans | 14,323 | 11,798
Commercial Portfolio Segment [Member] |  |
With no allocated allowance |  |
Loans with no related allowance, unpaid principal balance | 15,425 | 19,479
Loans with no related allowance, recorded investment | 14,397 | 18,452
With allocated allowance |  |
Loans with related allowance, unpaid principal balance | 16,629 | 7,003
Loans with related allowance, recorded investment | 13,233 | 5,037
Allowance | 7,561 | 1,263
Total impaired loans | 7,561 | 1,263
Real Estate Construction Portfolio Segment [Member] |  |
With no allocated allowance |  |
Loans with no related allowance, unpaid principal balance | 48,495 | 32,924
Loans with no related allowance, recorded investment | 22,292 | 17,025
With allocated allowance |  |
Loans with related allowance, unpaid principal balance |  | 19,006
Loans with related allowance, recorded investment |  | 8,703
Allowance |  | 1,077
Total impaired loans |  | 1,077
Commercial Real Estate Portfolio Segment [Member] |  |
With no allocated allowance |  |
Loans with no related allowance, unpaid principal balance | 73,980 | 77,474
Loans with no related allowance, recorded investment | 68,680 | 75,172
With allocated allowance |  |
Loans with related allowance, unpaid principal balance | 27,526 | 38,197
Loans with related allowance, recorded investment | 26,339 | 34,022
Allowance | 6,389 | 8,993
Total impaired loans | 6,389 | 8,993
Residential Mortgage and Equity Lines Portfolio Segment [Member] |  |
With no allocated allowance |  |
Loans with no related allowance, unpaid principal balance | 2,450 | 2,518
Loans with no related allowance, recorded investment | 2,450 | 2,518
With allocated allowance |  |
Loans with related allowance, unpaid principal balance | 14,210 | 14,019
Loans with related allowance, recorded investment | 13,731 | 13,590
Allowance | 373 | 465
Total impaired loans | $ 373 | $ 465

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