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Note 5 - Loans - Allowance for Loan Losses by Portfolio Segment (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Balance at beginning of year |  |  |  | $ 123,279 |  |  |  | $ 118,966 | $ 123,279 | $ 118,966 | $ 138,963
Provision/(reversal) for loan losses |  | $ (1,500) |  | (3,000) |  |  |  | (2,500) | (4,500) | (2,500) | (15,650)
Charge-offs |  |  |  |  |  |  |  |  | (3,206) | (4,173) | (18,903)
Recoveries |  |  |  |  |  |  |  |  | 6,818 | 10,986 | 14,556
Net Recoveries |  |  |  |  |  |  |  |  | 3,612 | 6,813 |
Balance at end of year | 122,391 |  |  |  | 123,279 |  |  |  | 122,391 | 123,279 | 118,966
Reserve for impaired loans | 3,802 |  |  |  | 2,134 |  |  |  | 3,802 | 2,134 |
Reserve for non-impaired loans | 118,589 |  |  |  | 121,145 |  |  |  | 118,589 | 121,145 |
Reserve for off-balance sheet credit commitments | 2,250 |  |  |  | 4,588 |  |  |  | 2,250 | 4,588 |
Commercial Portfolio Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of year |  |  |  | 49,796 |  |  |  | 49,203 | 49,796 | 49,203 |
Provision/(reversal) for loan losses |  |  |  |  |  |  |  |  | 3,936 | 504 |
Charge-offs |  |  |  |  |  |  |  |  | (629) | (3,313) |
Recoveries |  |  |  |  |  |  |  |  | 1,875 | 3,402 |
Net Recoveries |  |  |  |  |  |  |  |  | 1,246 | 89 |
Balance at end of year | 54,978 |  |  |  | 49,796 |  |  |  | 54,978 | 49,796 | 49,203
Reserve for impaired loans | 1,837 |  |  |  | 43 |  |  |  | 1,837 | 43 |
Reserve for non-impaired loans | 53,141 |  |  |  | 49,753 |  |  |  | 53,141 | 49,753 |
Reserve for off-balance sheet credit commitments | 1,161 |  |  |  | 2,919 |  |  |  | 1,161 | 2,919 |
Real Estate Construction Portfolio Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of year |  |  |  | 24,838 |  |  |  | 23,268 | 24,838 | 23,268 |
Provision/(reversal) for loan losses |  |  |  |  |  |  |  |  | (5,389) | 1,341 |
Charge-offs |  |  |  |  |  |  |  |  |  |  |
Recoveries |  |  |  |  |  |  |  |  | 177 | 229 |
Net Recoveries |  |  |  |  |  |  |  |  | 177 | 229 |
Balance at end of year | 19,626 |  |  |  | 24,838 |  |  |  | 19,626 | 24,838 | 23,268
Reserve for impaired loans |  |  |  |  |  |  |  |  |  |  |
Reserve for non-impaired loans | 19,626 |  |  |  | 24,838 |  |  |  | 19,626 | 24,838 |
Reserve for off-balance sheet credit commitments | 745 |  |  |  | 1,360 |  |  |  | 745 | 1,360 |
Commercial Real Estate Portfolio Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of year |  |  |  | 37,610 |  |  |  | 34,864 | 37,610 | 34,864 |
Provision/(reversal) for loan losses |  |  |  |  |  |  |  |  | (6,289) | (3,723) |
Charge-offs |  |  |  |  |  |  |  |  | (2,348) | (860) |
Recoveries |  |  |  |  |  |  |  |  | 4,514 | 7,329 |
Net Recoveries |  |  |  |  |  |  |  |  | 2,166 | 6,469 |
Balance at end of year | 33,487 |  |  |  | 37,610 |  |  |  | 33,487 | 37,610 | 34,864
Reserve for impaired loans | 877 |  |  |  | 1,738 |  |  |  | 877 | 1,738 |
Reserve for non-impaired loans | 32,610 |  |  |  | 35,872 |  |  |  | 32,610 | 35,872 |
Reserve for off-balance sheet credit commitments | 95 |  |  |  | 114 |  |  |  | 95 | 114 |
Residential Mortgage and Equity Lines Portfolio Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of year |  |  |  | 11,013 |  |  |  | 11,620 | 11,013 | 11,620 |
Provision/(reversal) for loan losses |  |  |  |  |  |  |  |  | 3,246 | (626) |
Charge-offs |  |  |  |  |  |  |  |  | (229) |  |
Recoveries |  |  |  |  |  |  |  |  | 252 | 19 |
Net Recoveries |  |  |  |  |  |  |  |  | 23 | 19 |
Balance at end of year | 14,282 |  |  |  | 11,013 |  |  |  | 14,282 | 11,013 | 11,620
Reserve for impaired loans | 1,088 |  |  |  | 353 |  |  |  | 1,088 | 353 |
Reserve for non-impaired loans | 13,194 |  |  |  | 10,660 |  |  |  | 13,194 | 10,660 |
Reserve for off-balance sheet credit commitments | 246 |  |  |  | 190 |  |  |  | 246 | 190 |
Installment and Other Loans [Member ] |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of year |  |  |  | $ 22 |  |  |  | $ 11 | 22 | 11 |
Provision/(reversal) for loan losses |  |  |  |  |  |  |  |  | (4) | 4 |
Charge-offs |  |  |  |  |  |  |  |  |  |  |
Recoveries |  |  |  |  |  |  |  |  |  | 7 |
Net Recoveries |  |  |  |  |  |  |  |  |  | 7 |
Balance at end of year | 18 |  |  |  | 22 |  |  |  | 18 | 22 | $ 11
Reserve for impaired loans |  |  |  |  |  |  |  |  |  |  |
Reserve for non-impaired loans | 18 |  |  |  | 22 |  |  |  | 18 | 22 |
Reserve for off-balance sheet credit commitments | $ 3 |  |  |  | $ 5 |  |  |  | $ 3 | $ 5 |

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