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Note 4 - Credit Quality (Details Textual) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Mar. 31, 2019 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018
Percentage of Loan Loss Covered by FDIC |  | 80.00% |  |
Financing Receivable, Collectively Evaluated for Impairment |  | $ 1,700,232 |  | $ 1,755,339
Restructured Loans, Reserves |  | 250 |  |
Performing Status Returned Period | 180 days |  |  |
Financing Receivable, Troubled Debt Restructuring, Subsequent Default |  | 0 | $ 0 |
Impaired Loans [Member] |  |  |  |
Financing Receivable, Collectively Evaluated for Impairment |  | 21,520 |  | 25,270
Non-covered Loans [Member] |  |  |  |
Financing Receivable, 90 Days or More Past Due, Still Accruing |  | $ 37 |  | 58
Covered Loans [Member] |  |  |  |
Financing Receivable, 90 Days or More Past Due, Still Accruing | $ 0 |  |  | $ 0

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