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Note 4 - Credit Quality - Recorded Investment and Interest Income Recognized on Impaired Loans Excluding Purchased Credit Impaired Loans (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Impaired loans with no related allowance, recorded investment |  | $ 27,240 | $ 25,728
Impaired loans with no related allowance, unpaid principal balance |  | 31,703 | 34,246
Impaired loans with a related allowance, recorded investment |  | 6,760 | 7,573
Impaired loans with a related allowance, unpaid principal balance |  | 6,815 | 7,632
Impaired loans, related allowance | [1] | 1,714 | 2,558
Total impaired loans, recorded investment | [1] | 34,000 | 33,301
Total impaired loans, unpaid principal balance | [1] | 38,518 | 41,878
Commercial Portfolio Segment [Member] | Construction, Development and Other Land [Member] |  |  |
Impaired loans with no related allowance, recorded investment |  | 903 | 727
Impaired loans with no related allowance, unpaid principal balance |  | 918 | 988
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member] |  |  |
Impaired loans with no related allowance, recorded investment |  | 300 | 315
Impaired loans with no related allowance, unpaid principal balance |  | 321 | 1,142
Impaired loans with a related allowance, recorded investment |  |  | 343
Impaired loans with a related allowance, unpaid principal balance |  |  | 343
Impaired loans, related allowance |  |  | 270
Commercial Portfolio Segment [Member] | Multi-family Residential [Member] |  |  |
Impaired loans with no related allowance, recorded investment |  | 1,380 | 499
Impaired loans with no related allowance, unpaid principal balance |  | 1,445 | 1,010
Impaired loans with a related allowance, recorded investment |  | 536 |
Impaired loans with a related allowance, unpaid principal balance |  | 536 |
Impaired loans, related allowance |  | 235 |
Commercial Portfolio Segment [Member] | Single Family Non-owner Occupied [Member] |  |  |
Impaired loans with no related allowance, recorded investment |  | 2,448 | 2,042
Impaired loans with no related allowance, unpaid principal balance |  | 2,782 | 3,521
Impaired loans with a related allowance, recorded investment |  | 842 | 446
Impaired loans with a related allowance, unpaid principal balance |  | 842 | 446
Impaired loans, related allowance |  | 238 | 62
Commercial Portfolio Segment [Member] | Non-farm, Non-residential [Member] |  |  |
Impaired loans with no related allowance, recorded investment |  | 3,859 | 3,022
Impaired loans with no related allowance, unpaid principal balance |  | 4,759 | 5,955
Impaired loans with a related allowance, recorded investment |  |  | 262
Impaired loans with a related allowance, unpaid principal balance |  |  | 263
Impaired loans, related allowance |  |  | 15
Commercial Portfolio Segment [Member] | Agricultural [Member] |  |  |
Impaired loans with no related allowance, recorded investment |  | 102 | 102
Impaired loans with no related allowance, unpaid principal balance |  | 107 | 107
Commercial Portfolio Segment [Member] | Farmland [Member] |  |  |
Impaired loans with no related allowance, recorded investment |  | 1,404 | 395
Impaired loans with no related allowance, unpaid principal balance |  | 1,478 | 414
Impaired loans with a related allowance, recorded investment |  | 410 | 936
Impaired loans with a related allowance, unpaid principal balance |  | 418 | 974
Impaired loans, related allowance |  | 158 | 233
Consumer Real Estate Portfolio Segment [Member] | Home Equity Lines [Member] |  |  |
Impaired loans with no related allowance, recorded investment |  | 1,451 | 1,621
Impaired loans with no related allowance, unpaid principal balance |  | 1,589 | 1,770
Impaired loans with a related allowance, recorded investment |  | 65 |
Impaired loans with a related allowance, unpaid principal balance |  | 68 |
Impaired loans, related allowance |  | 66 |
Consumer Real Estate Portfolio Segment [Member] | Single Family Owner Occupied [Member] |  |  |
Impaired loans with no related allowance, recorded investment |  | 14,963 | 16,633
Impaired loans with no related allowance, unpaid principal balance |  | 17,868 | 18,964
Impaired loans with a related allowance, recorded investment |  | 4,907 | 5,586
Impaired loans with a related allowance, unpaid principal balance |  | 4,951 | 5,606
Impaired loans, related allowance |  | 1,017 | 1,978
Consumer Real Estate Portfolio Segment [Member] | Owner Occupied Construction [Member] |  |  |
Impaired loans with no related allowance, recorded investment |  | 227 | 231
Impaired loans with no related allowance, unpaid principal balance |  | 227 | 231
Consumer and Other Portfolio Segment [Member] | Consumer Loans [Member] |  |  |
Impaired loans with no related allowance, recorded investment |  | 203 | 141
Impaired loans with no related allowance, unpaid principal balance |  | $ 209 | $ 144
[1] | Total impaired loans include loans totaling $25.42 million as of September 30, 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. 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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