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Note 5 - Credit Quality (Details Textual) $ in Thousands | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2020 USD ($) | Jun. 30, 2020 USD ($) | Dec. 31, 2019 USD ($) | Mar. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Financing Receivable, Collectively Evaluated for Impairment |  | $ 2,138,921 |  | $ 1,672,634 |  |
Loans Deemed to be Impaired, Threshold |  |  |  |  | $ 500 | $ 250
Impaired Financing Receivable, Recorded Investment, Total | [1] | 39,225 |  | 31,172 |  |
Restructured Loans, Reserves |  | $ 500 |  |  |  |
Performing Status Returned Period (Month) |  | 6 months |  |  |  |
Financing Receivable, Troubled Debt Restructuring |  | $ 12,062 |  | 8,917 |  |
Financing Receivable, Number of Payment Deferrals |  | 3,625 |  |  |  |
Financing Receivable, Deferred Payments |  | $ 458,170 | $ 436,110 |  |  |
Commercial Portfolio Segment [Member] |  |  |  |  |  |
Financing Receivable, Collectively Evaluated for Impairment |  | 1,252,765 |  | 969,838 |  |
Financing Receivable, Deferred Payments |  | 26,540 |  |  |  |
Consumer Portfolio Segment [Member] |  |  |  |  |  |
Financing Receivable, Deferred Payments |  | 5,720 |  |  |  |
Financial Asset Acquired with Credit Deterioration [Member] |  |  |  |  |  |
Impaired Financing Receivable, Recorded Investment, Total |  | 0 |  | 0 |  |
Impaired Loans [Member] |  |  |  |  |  |
Financing Receivable, Collectively Evaluated for Impairment |  | 31,180 |  | 24,640 |  |
Non-covered Loans [Member] |  |  |  |  |  |
Financing Receivable, 90 Days or More Past Due, Still Accruing |  | 295 |  | 144 |  |
Covered Loans [Member] |  |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring |  | $ 0 |  | $ 0 |  |
[1] | Total impaired loans include loans totaling $31.18 million as of December 31, 2020, and $24.64 million as of December 31, 2019, that do not meet the Company's evaluation threshold for individual impairment and are therefore collectively evaluated for impairment. During the first quarter of 2018, the Company changed the threshold for quarterly reviews of individual loans that are deemed to be impaired from $250 thousand to $500 thousand or greater.

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