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Note 4 - Credit Quality (Details Textual) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 USD ($) | Mar. 31, 2017 USD ($) | Dec. 31, 2017 USD ($)
Percentage of Loan Loss Covered by FDIC |  | 80.00% |  |
Financing Receivable, Collectively Evaluated for Impairment |  | $ 1,764,457 |  | $ 1,785,574
Impaired Financing Receivable, Recorded Investment, Total | [1] | 36,182 |  | 33,301
Restructured Loans, Reserves |  | $ 250 |  |
Performing Status Returned Period |  | 180 days |  |
Financing Receivable, Modifications, Recorded Investment |  | $ 9,303 |  | 9,663
Financing Receivable, Modifications, Number of Contracts |  | 0 | 0 |
Financing Receivable, Modifications, Subsequent Default, Recorded Investment |  | $ 0 | $ 0 |
Financial Asset Acquired with Credit Deterioration [Member] |  |  |  |
Impaired Financing Receivable, Recorded Investment, Total |  | 0 |  | 0
Impaired Loans [Member] |  |  |  |
Financing Receivable, Collectively Evaluated for Impairment |  | 25,060 |  | 20,130
Non-covered Loans [Member] |  |  |  |
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing |  | 27 |  | 1
Covered Loans [Member] |  |  |  |
Financing Receivable, Modifications, Recorded Investment |  | $ 0 |  | $ 0
[1] | Includes loans totaling $20.18 million as of March 31, 2018, and $20.13 million as of December 31, 2017, that do not meet the Company's evaluation threshold for individual impairment and are therefore collectively evaluated for impairment

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