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Note 12 - Fair Value Measurements - Financial Assets and Liabilities Measured on a Non-recurring Basis (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017 | Dec. 31, 2016
Assets, fair value disclosure | $ 1,325,569 |  |  |  | $ 1,325,569 |  |  |  | $ 1,340,767 |  |  |
Total Losses | 62 |  | $ 417 |  | 326 |  | $ 1,044 |  | 874 |  | $ 1,307 |
Fair Value, Measurements, Nonrecurring [Member] |  |  |  |  |  |  |  |  |  |  |  |
Assets, fair value disclosure | 47,587 |  |  |  | 47,587 |  |  |  | 73,493 |  |  |
Fair Value, Inputs, Level 1 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Assets, fair value disclosure | 222,896 |  |  |  | 222,896 |  |  |  | 277,622 |  |  |
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Nonrecurring [Member] |  |  |  |  |  |  |  |  |  |  |  |
Assets, fair value disclosure |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Inputs, Level 2 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Assets, fair value disclosure | 1,102,505 |  |  |  | 1,102,505 |  |  |  | 1,063,054 |  |  |
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Nonrecurring [Member] |  |  |  |  |  |  |  |  |  |  |  |
Assets, fair value disclosure | 4,918 |  |  |  | 4,918 |  |  |  | 5,677 |  |  |
Fair Value, Inputs, Level 3 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Assets, fair value disclosure | 168 |  |  |  | 168 |  |  |  | 91 |  |  |
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member] |  |  |  |  |  |  |  |  |  |  |  |
Assets, fair value disclosure | 42,669 |  |  |  | 42,669 |  |  |  | 67,816 |  |  |
Impaired Loans [Member] |  |  |  |  |  |  |  |  |  |  |  |
Total Losses |  |  |  |  |  |  | 25 |  | 25 |  | 322 |
Impaired Loans [Member] | Fair Value, Measurements, Nonrecurring [Member] |  |  |  |  |  |  |  |  |  |  |  |
Assets, fair value disclosure | 36,138 |  |  |  | 36,138 |  |  |  | 60,911 |  |  |
Impaired Loans [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Nonrecurring [Member] |  |  |  |  |  |  |  |  |  |  |  |
Assets, fair value disclosure |  |  |  |  |  |  |  |  |  |  |  |
Impaired Loans [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Nonrecurring [Member] |  |  |  |  |  |  |  |  |  |  |  |
Assets, fair value disclosure |  |  |  |  |  |  |  |  |  |  |  |
Impaired Loans [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member] |  |  |  |  |  |  |  |  |  |  |  |
Assets, fair value disclosure | 36,138 |  |  |  | 36,138 |  |  |  | 60,911 |  |  |
Impaired Loans [Member] | Commercial Portfolio Segment [Member] |  |  |  |  |  |  |  |  |  |  |  |
Total Losses |  |  |  |  |  |  | 25 |  | 25 |  | 322 |
Impaired Loans [Member] | Commercial Portfolio Segment [Member] | Fair Value, Measurements, Nonrecurring [Member] |  |  |  |  |  |  |  |  |  |  |  |
Assets, fair value disclosure | 3,209 |  |  |  | 3,209 |  |  |  | 18,097 |  |  |
Impaired Loans [Member] | Commercial Portfolio Segment [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Nonrecurring [Member] |  |  |  |  |  |  |  |  |  |  |  |
Assets, fair value disclosure |  |  |  |  |  |  |  |  |  |  |  |
Impaired Loans [Member] | Commercial Portfolio Segment [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Nonrecurring [Member] |  |  |  |  |  |  |  |  |  |  |  |
Assets, fair value disclosure |  |  |  |  |  |  |  |  |  |  |  |
Impaired Loans [Member] | Commercial Portfolio Segment [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member] |  |  |  |  |  |  |  |  |  |  |  |
Assets, fair value disclosure | 3,209 |  |  |  | 3,209 |  |  |  | 18,097 |  |  |
Impaired Loans [Member] | Commercial Real Estate Portfolio Segment [Member] |  |  |  |  |  |  |  |  |  |  |  |
Total Losses |  |  |  |  |  |  |  |  |  |  |  |
Impaired Loans [Member] | Commercial Real Estate Portfolio Segment [Member] | Fair Value, Measurements, Nonrecurring [Member] |  |  |  |  |  |  |  |  |  |  |  |
Assets, fair value disclosure | 26,606 |  |  |  | 26,606 |  |  |  | 31,459 |  |  |
Impaired Loans [Member] | Commercial Real Estate Portfolio Segment [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Nonrecurring [Member] |  |  |  |  |  |  |  |  |  |  |  |
Assets, fair value disclosure |  |  |  |  |  |  |  |  |  |  |  |
Impaired Loans [Member] | Commercial Real Estate Portfolio Segment [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Nonrecurring [Member] |  |  |  |  |  |  |  |  |  |  |  |
Assets, fair value disclosure |  |  |  |  |  |  |  |  |  |  |  |
Impaired Loans [Member] | Commercial Real Estate Portfolio Segment [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member] |  |  |  |  |  |  |  |  |  |  |  |
Assets, fair value disclosure | 26,606 |  |  |  | 26,606 |  |  |  | 31,459 |  |  |
Impaired Loans [Member] | Residential Mortgage and Equity Lines Portfolio Segment [Member] |  |  |  |  |  |  |  |  |  |  |  |
Total Losses |  |  |  |  |  |  |  |  |  |  |  |
Impaired Loans [Member] | Residential Mortgage and Equity Lines Portfolio Segment [Member] | Fair Value, Measurements, Nonrecurring [Member] |  |  |  |  |  |  |  |  |  |  |  |
Assets, fair value disclosure | 6,323 |  |  |  | 6,323 |  |  |  | 11,355 |  |  |
Impaired Loans [Member] | Residential Mortgage and Equity Lines Portfolio Segment [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Nonrecurring [Member] |  |  |  |  |  |  |  |  |  |  |  |
Assets, fair value disclosure |  |  |  |  |  |  |  |  |  |  |  |
Impaired Loans [Member] | Residential Mortgage and Equity Lines Portfolio Segment [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Nonrecurring [Member] |  |  |  |  |  |  |  |  |  |  |  |
Assets, fair value disclosure |  |  |  |  |  |  |  |  |  |  |  |
Impaired Loans [Member] | Residential Mortgage and Equity Lines Portfolio Segment [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member] |  |  |  |  |  |  |  |  |  |  |  |
Assets, fair value disclosure | 6,323 |  |  |  | 6,323 |  |  |  | 11,355 |  |  |
Other Real Estate Owned [Member] |  |  |  |  |  |  |  |  |  |  |  |
Total Losses |  | [1] | 405 | [1] |  | [1] | 654 | [1] | 457 | [2] | 9 | [2]
Other Real Estate Owned [Member] | Fair Value, Measurements, Nonrecurring [Member] |  |  |  |  |  |  |  |  |  |  |  |
Assets, fair value disclosure | 9,261 | [1] |  |  | 9,261 | [1] |  |  | 9,999 | [2] |  |
Other Real Estate Owned [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Nonrecurring [Member] |  |  |  |  |  |  |  |  |  |  |  |
Assets, fair value disclosure |  | [1] |  |  |  | [1] |  |  |  | [2] |  |
Other Real Estate Owned [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Nonrecurring [Member] |  |  |  |  |  |  |  |  |  |  |  |
Assets, fair value disclosure | 4,918 | [1] |  |  | 4,918 | [1] |  |  | 5,677 | [2] |  |
Other Real Estate Owned [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member] |  |  |  |  |  |  |  |  |  |  |  |
Assets, fair value disclosure | 4,343 | [1] |  |  | 4,343 | [1] |  |  | 4,322 | [2] |  |
Equity Investments [Member] |  |  |  |  |  |  |  |  |  |  |  |
Total Losses | 62 |  | $ 12 |  | 326 |  | $ 365 |  | 392 |  | $ 976 |
Equity Investments [Member] | Fair Value, Measurements, Nonrecurring [Member] |  |  |  |  |  |  |  |  |  |  |  |
Assets, fair value disclosure | 2,188 |  |  |  | 2,188 |  |  |  | 2,583 |  |  |
Equity Investments [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Nonrecurring [Member] |  |  |  |  |  |  |  |  |  |  |  |
Assets, fair value disclosure |  |  |  |  |  |  |  |  |  |  |  |
Equity Investments [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Nonrecurring [Member] |  |  |  |  |  |  |  |  |  |  |  |
Assets, fair value disclosure |  |  |  |  |  |  |  |  |  |  |  |
Equity Investments [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member] |  |  |  |  |  |  |  |  |  |  |  |
Assets, fair value disclosure | $ 2,188 |  |  |  | $ 2,188 |  |  |  | $ 2,583 |  |  |
[1] | Other real estate owned balance of $8.7 million in the condensed consolidated balance sheet is net of estimated disposal costs.
[2] | Other real estate owned balance of $9.4 million in the Consolidated Balance Sheets is net of estimated disposal costs.

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