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Note 5 - Loans (Details) - Impaired Loans and Related Allowance for Credit Losses - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
With no allocated allowance |  |
Loans with no related allowance, unpaid principal balance | $ 129,970 | $ 132,395
Loans with no related allowance, recorded investment | 86,374 | 113,167
With allocated allowance |  |
Loans with related allowance, unpaid principal balance | 50,398 | 78,225
Loans with related allowance, recorded investment | 47,436 | 61,352
Allowance | 7,749 | 11,798
Total impaired loans | 180,368 | 210,620
Total impaired loans | 133,810 | 174,519
Total impaired loans | 7,749 | 11,798
Commercial Portfolio Segment [Member] |  |
With no allocated allowance |  |
Loans with no related allowance, unpaid principal balance | 15,493 | 19,479
Loans with no related allowance, recorded investment | 6,721 | 18,452
With allocated allowance |  |
Loans with related allowance, unpaid principal balance | 7,757 | 7,003
Loans with related allowance, recorded investment | 6,847 | 5,037
Allowance | 530 | 1,263
Total impaired loans | 530 | 1,263
Real Estate Construction Portfolio Segment [Member] |  |
With no allocated allowance |  |
Loans with no related allowance, unpaid principal balance | 51,290 | 32,924
Loans with no related allowance, recorded investment | 22,002 | 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 | 59,954 | 77,474
Loans with no related allowance, recorded investment | 54,625 | 75,172
With allocated allowance |  |
Loans with related allowance, unpaid principal balance | 28,258 | 38,197
Loans with related allowance, recorded investment | 27,152 | 34,022
Allowance | 6,792 | 8,993
Total impaired loans | 6,792 | 8,993
Residential Mortgage and Equity Lines Portfolio Segment [Member] |  |
With no allocated allowance |  |
Loans with no related allowance, unpaid principal balance | 3,233 | 2,518
Loans with no related allowance, recorded investment | 3,026 | 2,518
With allocated allowance |  |
Loans with related allowance, unpaid principal balance | 14,383 | 14,019
Loans with related allowance, recorded investment | 13,437 | 13,590
Allowance | 427 | 465
Total impaired loans | $ 427 | $ 465

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