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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
Sep. 30, 2018
Dec. 31, 2017
Allowance for loans individually evaluated $ 1,714 $ 2,558
Loans collectively evaluated for impairment 1,768,659 1,785,574
Allowance for loans collectively evaluated 16,542 16,718
Loans individually evaluated for impairment 8,577 13,170
Commercial Portfolio Segment [Member]    
Allowance for loans individually evaluated 631 580
Loans collectively evaluated for impairment 1,050,762 1,058,468
Allowance for loans collectively evaluated 9,858 11,092
Loans individually evaluated for impairment 2,885 3,699
Commercial Portfolio Segment [Member] | Construction, Development and Other Land [Member]    
Allowance for loans individually evaluated
Loans collectively evaluated for impairment 62,053 59,386
Allowance for loans collectively evaluated 394 830
Loans individually evaluated for impairment  
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member]    
Allowance for loans individually evaluated 270
Loans collectively evaluated for impairment 105,597 91,845
Allowance for loans collectively evaluated 587 492
Loans individually evaluated for impairment 343
Commercial Portfolio Segment [Member] | Multi-family Residential [Member]    
Allowance for loans individually evaluated 235
Loans collectively evaluated for impairment 112,174 125,202
Allowance for loans collectively evaluated 987 1,094
Loans individually evaluated for impairment 536
Commercial Portfolio Segment [Member] | Single Family Non-owner Occupied [Member]    
Allowance for loans individually evaluated 238 62
Loans collectively evaluated for impairment 139,958 139,093
Allowance for loans collectively evaluated 6,296 1,914
Loans individually evaluated for impairment 842 770
Commercial Portfolio Segment [Member] | Non-farm, Non-residential [Member]    
Allowance for loans individually evaluated 15
Loans collectively evaluated for impairment 602,017 611,477
Allowance for loans collectively evaluated 1,363 6,582
Loans individually evaluated for impairment 582 1,367
Commercial Portfolio Segment [Member] | Agricultural [Member]    
Allowance for loans individually evaluated
Loans collectively evaluated for impairment 9,016 7,035
Allowance for loans collectively evaluated 89 51
Loans individually evaluated for impairment
Commercial Portfolio Segment [Member] | Farmland [Member]    
Allowance for loans individually evaluated 158 233
Loans collectively evaluated for impairment 19,947 24,430
Allowance for loans collectively evaluated 142 129
Loans individually evaluated for impairment 925 1,219
Consumer Real Estate Portfolio Segment [Member]    
Allowance for loans individually evaluated 1,083 1,978
Loans collectively evaluated for impairment 642,791 651,333
Allowance for loans collectively evaluated 5,749 4,832
Loans individually evaluated for impairment 5,692 9,471
Consumer Real Estate Portfolio Segment [Member] | Home Equity Lines [Member]    
Allowance for loans individually evaluated 66
Loans collectively evaluated for impairment 107,452 115,807
Allowance for loans collectively evaluated 687 803
Loans individually evaluated for impairment 65
Consumer Real Estate Portfolio Segment [Member] | Single Family Owner Occupied [Member]    
Allowance for loans individually evaluated 1,017 1,978
Loans collectively evaluated for impairment 517,450 496,348
Allowance for loans collectively evaluated 4,938 3,732
Loans individually evaluated for impairment 5,627 9,471
Consumer Real Estate Portfolio Segment [Member] | Owner Occupied Construction [Member]    
Allowance for loans individually evaluated
Loans collectively evaluated for impairment 17,889 39,178
Allowance for loans collectively evaluated 124 297
Loans individually evaluated for impairment
Consumer and Other Portfolio Segment [Member]    
Allowance for loans individually evaluated
Loans collectively evaluated for impairment 75,106 75,773
Allowance for loans collectively evaluated 935 794
Loans individually evaluated for impairment
Consumer and Other Portfolio Segment [Member] | Consumer Loans [Member]    
Allowance for loans individually evaluated
Loans collectively evaluated for impairment 69,974 70,772
Allowance for loans collectively evaluated 935 794
Loans individually evaluated for impairment
Consumer and Other Portfolio Segment [Member] | Other Loan [Member]    
Allowance for loans individually evaluated
Loans collectively evaluated for impairment 5,132 5,001
Allowance for loans collectively evaluated
Loans individually evaluated for impairment