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Note 5 - Credit Quality - Recorded Investment and Interest Income Recognized on Impaired Loans Excluding Purchased Credit Impaired Loans (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Impaired loans with no related allowance, recorded investment $ 25,728 $ 22,074
Impaired loans with no related allowance, unpaid principal balance 34,246 24,133
Impaired loans with a related allowance, recorded investment 7,573 4,899
Impaired loans with a related allowance, unpaid principal balance 7,632 4,955
Impaired loans, related allowance [1] 2,558 819
Total impaired loans, recorded investment [1] 33,301 26,973
Total impaired loans, unpaid principal balance [1] 41,878 29,088
Commercial Portfolio Segment [Member] | Construction, Development and Other Land [Member]    
Impaired loans with no related allowance, recorded investment 727 33
Impaired loans with no related allowance, unpaid principal balance 988 35
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member]    
Impaired loans with no related allowance, recorded investment 315 346
Impaired loans with no related allowance, unpaid principal balance 1,142 383
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 499 294
Impaired loans with no related allowance, unpaid principal balance 1,010 369
Commercial Portfolio Segment [Member] | Single Family Non-owner Occupied [Member]    
Impaired loans with no related allowance, recorded investment 2,042 3,084
Impaired loans with no related allowance, unpaid principal balance 3,521 3,334
Impaired loans with a related allowance, recorded investment 446 351
Impaired loans with a related allowance, unpaid principal balance 446 351
Impaired loans, related allowance 62 31
Commercial Portfolio Segment [Member] | Non-farm, Non-residential [Member]    
Impaired loans with no related allowance, recorded investment 3,022 3,829
Impaired loans with no related allowance, unpaid principal balance 5,955 4,534
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
Impaired loans with no related allowance, unpaid principal balance 107
Commercial Portfolio Segment [Member] | Farmland [Member]    
Impaired loans with no related allowance, recorded investment 395 1,161
Impaired loans with no related allowance, unpaid principal balance 414 1,188
Impaired loans with a related allowance, recorded investment 936 430
Impaired loans with a related allowance, unpaid principal balance 974 430
Impaired loans, related allowance 233 18
Consumer Real Estate Portfolio Segment [Member] | Home Equity Lines [Member]    
Impaired loans with no related allowance, recorded investment 1,621 913
Impaired loans with no related allowance, unpaid principal balance 1,770 968
Consumer Real Estate Portfolio Segment [Member] | Single Family Owner Occupied [Member]    
Impaired loans with no related allowance, recorded investment 16,633 11,779
Impaired loans with no related allowance, unpaid principal balance 18,964 12,630
Impaired loans with a related allowance, recorded investment 5,586 4,118
Impaired loans with a related allowance, unpaid principal balance 5,606 4,174
Impaired loans, related allowance 1,978 770
Consumer Real Estate Portfolio Segment [Member] | Owner Occupied Construction [Member]    
Impaired loans with no related allowance, recorded investment 231 573
Impaired loans with no related allowance, unpaid principal balance 231 589
Consumer and Other Portfolio Segment [Member] | Consumer Loans [Member]    
Impaired loans with no related allowance, recorded investment 141 62
Impaired loans with no related allowance, unpaid principal balance $ 144 $ 103
[1] Includes loans totaling $20.13 million as of December 31, 2017, and $16.89 million as of December 31, 2016, that do not meet the Company's evaluation threshold for individual impairment and are therefore collectively evaluated for impairment