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Note 5 - Loans (Details) - Activity in the Allowance for Credit Losses - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Allowance for Loan Losses |  |  |  |  |  |  |  |  |  |
Balance, beginning |  |  |  | $ 161,420 |  |  |  | $ 161,420 | $ 173,889 |
(Reversal)/provision for possible loan losses | $ (3,000) | $ (1,250) | $ (2,150) | (5,000) | $ (2,000) | $ (5,100) | $ (3,700) | (11,400) | (11,172) | $ (3,000)
Transfers to reserve for off-balance sheet credit commitments |  |  |  |  |  |  |  |  | (372) |
Loans charged off |  |  |  |  |  |  |  | (20,427) | (22,235) | (20,442)
Recoveries of charged off loans |  |  |  |  |  |  |  | 9,370 | 20,938 | 14,009
Balance, ending | 138,963 |  |  |  | 161,420 |  |  | 138,963 | 161,420 | 173,889
Beginning of Period [Member] |  |  |  |  |  |  |  |  |  |
Allowance for Loan Losses |  |  |  |  |  |  |  |  |  |
Balance, beginning |  |  |  | 161,420 |  |  |  | 161,420 | 173,889 | 183,322
Balance, ending |  |  |  |  | 161,420 |  |  |  | 161,420 | 173,889
End of Period [Member] |  |  |  |  |  |  |  |  |  |
Allowance for Loan Losses |  |  |  |  |  |  |  |  |  |
Balance, beginning |  |  |  | 161,420 |  |  |  | 161,420 | 173,889 |
Balance, ending | 138,963 |  |  |  | 161,420 |  |  | 138,963 | 161,420 | 173,889
Reserve for Off-Balance Sheet Credit Commitments [Member] |  |  |  |  |  |  |  |  |  |
Allowance for Loan Losses |  |  |  |  |  |  |  |  |  |
(Reversal)/provision for possible loan losses |  |  |  |  |  |  |  | (455) | 586 |
Reserve for Off-Balance Sheet Credit Commitments [Member] | Beginning of Period [Member] |  |  |  |  |  |  |  |  |  |
Allowance for Loan Losses |  |  |  |  |  |  |  |  |  |
Balance, beginning |  |  |  | 1,949 |  |  |  | 1,949 | 1,363 | 1,363
Balance, ending |  |  |  |  | 1,949 |  |  |  | 1,949 | 1,363
Reserve for Off-Balance Sheet Credit Commitments [Member] | End of Period [Member] |  |  |  |  |  |  |  |  |  |
Allowance for Loan Losses |  |  |  |  |  |  |  |  |  |
Balance, beginning |  |  |  | $ 1,949 |  |  |  | 1,949 | 1,363 |
Balance, ending | $ 1,494 |  |  |  | $ 1,949 |  |  | $ 1,494 | $ 1,949 | $ 1,363

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- References No definition available. + Details
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X
- Definition Amount of provision (reversal) related to loan transactions based on the assessment of uncollectability from the counterparty to reduce the account to their net realizable value. + References No definition available. + Details
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- Definition Transfers from/to reserve for off-balance sheet credit commitments. + References No definition available. + Details
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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=49124121&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=49124121&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=49124121&loc=SL6953423-111524 + Details
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