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Note 12 - Fair Value - Quantitative Information for Assets Measured at Fair Value on Nonrecurring Basis (Details) - Fair Value, Measurements, Nonrecurring [Member] | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2017 | Dec. 31, 2016
Impaired Loans [Member] | Non-covered Loans [Member] |  |  |
Valuation technique | [1] | Discounted appraisals(1) |
Unobservable input | [2] | Appraisal adjustments(2) |
Impaired Loans [Member] | Non-covered Loans [Member] | Minimum [Member] |  |  |
Discount range |  | 2.00% | 3.00%
Impaired Loans [Member] | Non-covered Loans [Member] | Maximum [Member] |  |  |
Discount range |  | 63.00% | 39.00%
Impaired Loans [Member] | Non-covered Loans [Member] | Weighted Average [Member] |  |  |
Discount range |  | 18.00% | 17.00%
OREO [Member] | Non-covered Loans [Member] |  |  |
Valuation technique | [1] | Discounted appraisals(1) |
Unobservable input | [2] | Appraisal adjustments(2) |
OREO [Member] | Non-covered Loans [Member] | Minimum [Member] |  |  |
Discount range |  | 10.00% | 0.00%
OREO [Member] | Non-covered Loans [Member] | Maximum [Member] |  |  |
Discount range |  | 62.00% | 88.00%
OREO [Member] | Non-covered Loans [Member] | Weighted Average [Member] |  |  |
Discount range |  | 28.00% | 30.00%
OREO [Member] | Covered Loans [Member] |  |  |
Valuation technique | [1] | Discounted appraisals(1) |
Unobservable input | [2] | Appraisal adjustments(2) |
OREO [Member] | Covered Loans [Member] | Minimum [Member] |  |  |
Discount range |  | 0.00% | 0.00%
OREO [Member] | Covered Loans [Member] | Maximum [Member] |  |  |
Discount range |  | 65.00% | 44.00%
OREO [Member] | Covered Loans [Member] | Weighted Average [Member] |  |  |
Discount range |  | 56.00% | 40.00%
[1] | Fair value is generally based on appraisals of the underlying collateral.
[2] | Appraisals may be adjusted by management for customized discounting criteria, estimated sales costs, and proprietary qualitative adjustments.

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- Definition Description of unobservable input used to measure fair value. + References No definition available. + Details
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- Definition Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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- Definition Description of the inputs and valuation technique(s) used to measure fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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