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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
Mar. 31, 2018
Dec. 31, 2017
Impaired loans with no related allowance, recorded investment $ 28,334 $ 25,728
Impaired loans with no related allowance, unpaid principal balance 36,287 34,246
Impaired loans with a related allowance, recorded investment 7,848 7,573
Impaired loans with a related allowance, unpaid principal balance 7,856 7,632
Impaired loans, related allowance [1] 2,894 2,558
Total impaired loans, recorded investment [1] 36,182 33,301
Total impaired loans, unpaid principal balance [1] 44,143 41,878
Commercial Portfolio Segment [Member] | Construction, Development and Other Land [Member]    
Impaired loans with no related allowance, recorded investment 976 727
Impaired loans with no related allowance, unpaid principal balance 1,160 988
Impaired loans with a related allowance, recorded investment
Impaired loans with a related allowance, unpaid principal balance
Impaired loans, related allowance
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member]    
Impaired loans with no related allowance, recorded investment 152 315
Impaired loans with no related allowance, unpaid principal balance 930 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 663 499
Impaired loans with no related allowance, unpaid principal balance 1,172 1,010
Commercial Portfolio Segment [Member] | Single Family Non-owner Occupied [Member]    
Impaired loans with no related allowance, recorded investment 2,406 2,042
Impaired loans with no related allowance, unpaid principal balance 3,642 3,521
Impaired loans with a related allowance, recorded investment 444 446
Impaired loans with a related allowance, unpaid principal balance 444 446
Impaired loans, related allowance 60 62
Commercial Portfolio Segment [Member] | Non-farm, Non-residential [Member]    
Impaired loans with no related allowance, recorded investment 5,714 3,022
Impaired loans with no related allowance, unpaid principal balance 8,338 5,955
Impaired loans with a related allowance, recorded investment 1,378 262
Impaired loans with a related allowance, unpaid principal balance 1,378 263
Impaired loans, related allowance 591 15
Commercial Portfolio Segment [Member] | Agricultural [Member]    
Impaired loans with no related allowance, recorded investment 287 102
Impaired loans with no related allowance, unpaid principal balance 293 107
Commercial Portfolio Segment [Member] | Farmland [Member]    
Impaired loans with no related allowance, recorded investment 897 395
Impaired loans with no related allowance, unpaid principal balance 959 414
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 105 233
Consumer Real Estate Portfolio Segment [Member] | Home Equity Lines [Member]    
Impaired loans with no related allowance, recorded investment 1,743 1,621
Impaired loans with no related allowance, unpaid principal balance 1,928 1,770
Impaired loans with a related allowance, recorded investment 73
Impaired loans with a related allowance, unpaid principal balance 73
Impaired loans, related allowance 73
Consumer Real Estate Portfolio Segment [Member] | Single Family Owner Occupied [Member]    
Impaired loans with no related allowance, recorded investment 15,191 16,633
Impaired loans with no related allowance, unpaid principal balance 17,558 18,964
Impaired loans with a related allowance, recorded investment 5,543 5,586
Impaired loans with a related allowance, unpaid principal balance 5,543 5,606
Impaired loans, related allowance 2,065 1,978
Consumer Real Estate Portfolio Segment [Member] | Owner Occupied Construction [Member]    
Impaired loans with no related allowance, recorded investment 230 231
Impaired loans with no related allowance, unpaid principal balance 230 231
Consumer and Other Portfolio Segment [Member] | Consumer Loans [Member]    
Impaired loans with no related allowance, recorded investment 75 141
Impaired loans with no related allowance, unpaid principal balance $ 77 $ 144
[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