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Note 5 - Allowance for Loan Losses - Allowance for Loan Losses and Recorded Investment in Loans, Evaluated for Impairment Excluding PCI Loans, by Loan Class (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Loans individually evaluated for impairment $ 11,121 $ 13,170
Allowance for loans individually evaluated 2,894 2,558
Loans collectively evaluated for impairment 1,764,457 1,785,574
Allowance for loans collectively evaluated 16,606 16,718
Commercial Portfolio Segment [Member]    
Loans individually evaluated for impairment 4,131 3,699
Allowance for loans individually evaluated 756 580
Loans collectively evaluated for impairment 1,046,033 1,058,468
Allowance for loans collectively evaluated 11,022 11,092
Commercial Portfolio Segment [Member] | Construction, Development and Other Land [Member]    
Loans individually evaluated for impairment
Allowance for loans individually evaluated
Loans collectively evaluated for impairment 51,658 59,386
Allowance for loans collectively evaluated 723 830
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member]    
Loans individually evaluated for impairment 343
Allowance for loans individually evaluated 270
Loans collectively evaluated for impairment 90,353 91,845
Allowance for loans collectively evaluated 491 492
Commercial Portfolio Segment [Member] | Multi-family Residential [Member]    
Loans individually evaluated for impairment
Allowance for loans individually evaluated
Loans collectively evaluated for impairment 120,656 125,202
Allowance for loans collectively evaluated 1,057 1,094
Commercial Portfolio Segment [Member] | Single Family Non-owner Occupied [Member]    
Loans individually evaluated for impairment 444 770
Allowance for loans individually evaluated 60 62
Loans collectively evaluated for impairment 139,683 139,093
Allowance for loans collectively evaluated 1,934 1,914
Commercial Portfolio Segment [Member] | Non-farm, Non-residential [Member]    
Loans individually evaluated for impairment 2,756 1,367
Allowance for loans individually evaluated 591 15
Loans collectively evaluated for impairment 611,697 611,477
Allowance for loans collectively evaluated 6,629 6,582
Commercial Portfolio Segment [Member] | Agricultural [Member]    
Loans individually evaluated for impairment
Allowance for loans individually evaluated
Loans collectively evaluated for impairment 9,350 7,035
Allowance for loans collectively evaluated 63 51
Commercial Portfolio Segment [Member] | Farmland [Member]    
Loans individually evaluated for impairment 931 1,219
Allowance for loans individually evaluated 105 233
Loans collectively evaluated for impairment 22,636 24,430
Allowance for loans collectively evaluated 125 129
Consumer Real Estate Portfolio Segment [Member]    
Loans individually evaluated for impairment 6,990 9,471
Allowance for loans individually evaluated 2,138 1,978
Loans collectively evaluated for impairment 645,380 651,333
Allowance for loans collectively evaluated 4,825 4,832
Consumer Real Estate Portfolio Segment [Member] | Home Equity Lines [Member]    
Loans individually evaluated for impairment 73
Allowance for loans individually evaluated 73
Loans collectively evaluated for impairment 113,435 115,807
Allowance for loans collectively evaluated 790 803
Consumer Real Estate Portfolio Segment [Member] | Single Family Owner Occupied [Member]    
Loans individually evaluated for impairment 6,917 9,471
Allowance for loans individually evaluated 2,065 1,978
Loans collectively evaluated for impairment 502,427 496,348
Allowance for loans collectively evaluated 3,811 3,732
Consumer Real Estate Portfolio Segment [Member] | Owner Occupied Construction [Member]    
Loans individually evaluated for impairment
Allowance for loans individually evaluated
Loans collectively evaluated for impairment 29,518 39,178
Allowance for loans collectively evaluated 224 297
Consumer and Other Portfolio Segment [Member]    
Loans individually evaluated for impairment
Allowance for loans individually evaluated
Loans collectively evaluated for impairment 73,044 75,773
Allowance for loans collectively evaluated 759 794
Consumer and Other Portfolio Segment [Member] | Consumer Loans [Member]    
Loans individually evaluated for impairment
Allowance for loans individually evaluated
Loans collectively evaluated for impairment 68,534 70,772
Allowance for loans collectively evaluated 759 794
Consumer and Other Portfolio Segment [Member] | Other Loan [Member]    
Loans individually evaluated for impairment
Allowance for loans individually evaluated
Loans collectively evaluated for impairment 4,510 5,001
Allowance for loans collectively evaluated