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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, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Balance at beginning of year |  |  |  | $ 118,966 |  |  |  | $ 138,963 | $ 118,966 | $ 138,963 | $ 161,420
Provision/(reversal) for loan losses |  |  |  | (2,500) |  |  | $ (5,150) | (10,500) | (2,500) | (15,650) | (11,400)
Charge-offs |  |  |  |  |  |  |  |  | (4,173) | (18,903) | (20,427)
Recoveries |  |  |  |  |  |  |  |  | 10,986 | 14,556 | 9,370
Net (Charge-offs)/Recoveries |  |  |  |  |  |  |  |  | 6,813 | (4,347) |
Balance at end of year | 123,279 |  |  |  | 118,966 |  |  |  | 123,279 | 118,966 | 138,963
Reserve for impaired loans | 2,134 |  |  |  | 2,796 |  |  |  | 2,134 | 2,796 |
Reserve for non-impaired loans | 121,145 |  |  |  | 116,170 |  |  |  | 121,145 | 116,170 |
Reserve for off-balance sheet credit commitments | 4,588 |  |  |  | 3,224 |  |  |  | 4,588 | 3,224 |
Commercial Portfolio Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of year |  |  |  | 49,203 |  |  |  | 56,199 | 49,203 | 56,199 |
Provision/(reversal) for loan losses |  |  |  |  |  |  |  |  | 117 | 1,815 |
Charge-offs |  |  |  |  |  |  |  |  | (3,313) | (12,955) |
Recoveries |  |  |  |  |  |  |  |  | 3,402 | 4,144 |
Net (Charge-offs)/Recoveries |  |  |  |  |  |  |  |  | 89 | (8,811) |
Balance at end of year | 49,796 |  |  |  | 49,203 |  |  |  | 49,796 | 49,203 | 56,199
Reserve for impaired loans | 43 |  |  |  | 1,827 |  |  |  | 43 | 1,827 |
Reserve for non-impaired loans | 49,753 |  |  |  | 47,376 |  |  |  | 49,753 | 47,376 |
Reserve for off-balance sheet credit commitments | 2,919 |  |  |  | 2,091 |  |  |  | 2,919 | 2,091 |
Real Estate Construction Portfolio Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of year |  |  |  | 23,268 |  |  |  | 22,170 | 23,268 | 22,170 |
Provision/(reversal) for loan losses |  |  |  |  |  |  |  |  | 955 | (6,819) |
Charge-offs |  |  |  |  |  |  |  |  |  |  |
Recoveries |  |  |  |  |  |  |  |  | 229 | 7,917 |
Net (Charge-offs)/Recoveries |  |  |  |  |  |  |  |  | 229 | 7,917 |
Balance at end of year | 24,838 |  |  |  | 23,268 |  |  |  | 24,838 | 23,268 | 22,170
Reserve for impaired loans |  |  |  |  |  |  |  |  |  |  |
Reserve for non-impaired loans | 24,838 |  |  |  | 23,268 |  |  |  | 24,838 | 23,268 |
Reserve for off-balance sheet credit commitments | 1,360 |  |  |  | 940 |  |  |  | 1,360 | 940 |
Commercial Real Estate Portfolio Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of year |  |  |  | 34,864 |  |  |  | 49,440 | 34,864 | 49,440 |
Provision/(reversal) for loan losses |  |  |  |  |  |  |  |  | (2,778) | (11,123) |
Charge-offs |  |  |  |  |  |  |  |  | (860) | (5,948) |
Recoveries |  |  |  |  |  |  |  |  | 7,329 | 2,495 |
Net (Charge-offs)/Recoveries |  |  |  |  |  |  |  |  | 6,469 | (3,453) |
Balance at end of year | 37,610 |  |  |  | 34,864 |  |  |  | 37,610 | 34,864 | 49,440
Reserve for impaired loans | 1,738 |  |  |  | 573 |  |  |  | 1,738 | 573 |
Reserve for non-impaired loans | 35,872 |  |  |  | 34,291 |  |  |  | 35,872 | 34,291 |
Reserve for off-balance sheet credit commitments | 114 |  |  |  | 41 |  |  |  | 114 | 41 |
Residential Mortgage and Equity Lines Portfolio Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of year |  |  |  | 11,620 |  |  |  | 11,145 | 11,620 | 11,145 |
Provision/(reversal) for loan losses |  |  |  |  |  |  |  |  | (798) | 475 |
Charge-offs |  |  |  |  |  |  |  |  |  |  |
Recoveries |  |  |  |  |  |  |  |  | 19 |  |
Net (Charge-offs)/Recoveries |  |  |  |  |  |  |  |  | 19 |  |
Balance at end of year | 11,013 |  |  |  | 11,620 |  |  |  | 11,013 | 11,620 | 11,145
Reserve for impaired loans | 353 |  |  |  | 396 |  |  |  | 353 | 396 |
Reserve for non-impaired loans | 10,660 |  |  |  | 11,224 |  |  |  | 10,660 | 11,224 |
Reserve for off-balance sheet credit commitments | 190 |  |  |  | 146 |  |  |  | 190 | 146 |
Installment and Other Loans [Member ] |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of year |  |  |  | $ 11 |  |  |  | $ 9 | 11 | 9 |
Provision/(reversal) for loan losses |  |  |  |  |  |  |  |  | 4 | 2 |
Charge-offs |  |  |  |  |  |  |  |  |  |  |
Recoveries |  |  |  |  |  |  |  |  | 7 |  |
Net (Charge-offs)/Recoveries |  |  |  |  |  |  |  |  | 7 |  |
Balance at end of year | 22 |  |  |  | 11 |  |  |  | 22 | 11 | $ 9
Reserve for impaired loans |  |  |  |  |  |  |  |  |  |  |
Reserve for non-impaired loans | 22 |  |  |  | 11 |  |  |  | 22 | 11 |
Reserve for off-balance sheet credit commitments | $ 5 |  |  |  | $ 6 |  |  |  | $ 5 | $ 6 |

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- Definition A valuation allowance for financing receivables that are expected to be uncollectible. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
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- Definition Amount of recovery of financing receivables doubtful of collection that were previously charged off. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(4) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
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- Definition Amount of expense related loan transactions, lease transactions, credit loss from transactions other than loan and lease transactions, and other loss based on assessment of uncollectability from the counterparty to reduce the account to their net realizable value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.11) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
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