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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
Jun. 30, 2018
Dec. 31, 2017
Loans individually evaluated for impairment $ 9,417 $ 13,170
Allowance for loans individually evaluated 3,079 2,558
Loans collectively evaluated for impairment 1,773,433 1,785,574
Allowance for loans collectively evaluated 16,504 16,718
Commercial Portfolio Segment [Member]    
Loans individually evaluated for impairment 2,307 3,699
Allowance for loans individually evaluated 578 580
Loans collectively evaluated for impairment 1,052,831 1,058,468
Allowance for loans collectively evaluated 10,324 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 57,375 59,386
Allowance for loans collectively evaluated 369 830
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 96,602 91,845
Allowance for loans collectively evaluated 538 492
Commercial Portfolio Segment [Member] | Multi-family Residential [Member]    
Loans individually evaluated for impairment
Allowance for loans individually evaluated
Loans collectively evaluated for impairment 110,067 125,202
Allowance for loans collectively evaluated 997 1,094
Commercial Portfolio Segment [Member] | Single Family Non-owner Occupied [Member]    
Loans individually evaluated for impairment 770
Allowance for loans individually evaluated 62
Loans collectively evaluated for impairment 139,813 139,093
Allowance for loans collectively evaluated 1,416 1,914
Commercial Portfolio Segment [Member] | Non-farm, Non-residential [Member]    
Loans individually evaluated for impairment 1,378 1,367
Allowance for loans individually evaluated 473 15
Loans collectively evaluated for impairment 618,953 611,477
Allowance for loans collectively evaluated 6,783 6,582
Commercial Portfolio Segment [Member] | Agricultural [Member]    
Loans individually evaluated for impairment
Allowance for loans individually evaluated
Loans collectively evaluated for impairment 8,895 7,035
Allowance for loans collectively evaluated 100 51
Commercial Portfolio Segment [Member] | Farmland [Member]    
Loans individually evaluated for impairment 929 1,219
Allowance for loans individually evaluated 105 233
Loans collectively evaluated for impairment 21,126 24,430
Allowance for loans collectively evaluated 121 129
Consumer Real Estate Portfolio Segment [Member]    
Loans individually evaluated for impairment 7,110 9,471
Allowance for loans individually evaluated 2,501 1,978
Loans collectively evaluated for impairment 647,081 651,333
Allowance for loans collectively evaluated 5,366 4,832
Consumer Real Estate Portfolio Segment [Member] | Home Equity Lines [Member]    
Loans individually evaluated for impairment 67
Allowance for loans individually evaluated 67
Loans collectively evaluated for impairment 111,616 115,807
Allowance for loans collectively evaluated 680 803
Consumer Real Estate Portfolio Segment [Member] | Single Family Owner Occupied [Member]    
Loans individually evaluated for impairment 7,043 9,471
Allowance for loans individually evaluated 2,434 1,978
Loans collectively evaluated for impairment 512,818 496,348
Allowance for loans collectively evaluated 4,525 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 22,647 39,178
Allowance for loans collectively evaluated 161 297
Consumer and Other Portfolio Segment [Member]    
Loans individually evaluated for impairment
Allowance for loans individually evaluated
Loans collectively evaluated for impairment 73,521 75,773
Allowance for loans collectively evaluated 814 794
Consumer and Other Portfolio Segment [Member] | Consumer Loans [Member]    
Loans individually evaluated for impairment
Allowance for loans individually evaluated
Loans collectively evaluated for impairment 68,885 70,772
Allowance for loans collectively evaluated 814 794
Consumer and Other Portfolio Segment [Member] | Other Loan [Member]    
Loans individually evaluated for impairment
Allowance for loans individually evaluated
Loans collectively evaluated for impairment 4,636 5,001
Allowance for loans collectively evaluated