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Note 5 - Loans - Activity in the Allowance for Credit Losses (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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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
Reversal for credit losses |  |  |  | (2,500) |  |  | $ (5,150) | (10,500) | (2,500) | (15,650) | (11,400)
Loans charged off |  |  |  |  |  |  |  |  | (4,173) | (18,903) | (20,427)
Recoveries of charged off loans |  |  |  |  |  |  |  |  | 10,986 | 14,556 | 9,370
Balance at end of year | 123,279 |  |  |  | 118,966 |  |  |  | 123,279 | 118,966 | 138,963
Provision/(reversal) for credit losses and transfers |  |  |  | (2,500) |  |  | $ (5,150) | (10,500) | (2,500) | (15,650) | (11,400)
Reserve for off Balance Sheet Credit Commitments [Member] |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of year |  |  |  | $ 3,224 |  |  |  | $ 1,494 | 3,224 | 1,494 | 1,949
Reversal for credit losses |  |  |  |  |  |  |  |  | 1,364 | 1,730 | (455)
Balance at end of year | $ 4,588 |  |  |  | $ 3,224 |  |  |  | 4,588 | 3,224 | 1,494
Provision/(reversal) for credit losses and transfers |  |  |  |  |  |  |  |  | $ 1,364 | $ 1,730 | $ (455)

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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 direct write-downs of financing receivables charged against the allowance. + 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)(3) -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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- Details
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