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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 (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Loans individually evaluated for impairment $ 15,517 $ 10,082
Allowance for loans individually evaluated 1,460 819
Loans collectively evaluated for impairment 1,801,111 1,814,437
Allowance for loans collectively evaluated 17,746 17,117
Commercial Portfolio Segment [Member]    
Loans individually evaluated for impairment 7,258 4,626
Allowance for loans individually evaluated 706 49
Loans collectively evaluated for impairment 1,065,794 1,065,126
Allowance for loans collectively evaluated 11,898 11,641
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 72,293 60,281
Allowance for loans collectively evaluated 1,099 889
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member]    
Loans individually evaluated for impairment 2,400
Allowance for loans individually evaluated 262
Loans collectively evaluated for impairment 87,782 93,099
Allowance for loans collectively evaluated 478 495
Commercial Portfolio Segment [Member] | Multi-family Residential [Member]    
Loans individually evaluated for impairment 254 281
Allowance for loans individually evaluated
Loans collectively evaluated for impairment 125,743 133,947
Allowance for loans collectively evaluated 1,133 1,157
Commercial Portfolio Segment [Member] | Single Family Non-owner Occupied [Member]    
Loans individually evaluated for impairment 1,103 1,910
Allowance for loans individually evaluated 69 31
Loans collectively evaluated for impairment 140,150 139,711
Allowance for loans collectively evaluated 2,308 2,721
Commercial Portfolio Segment [Member] | Non-farm, Non-residential [Member]    
Loans individually evaluated for impairment 2,561 1,454
Allowance for loans individually evaluated 325
Loans collectively evaluated for impairment 606,773 600,915
Allowance for loans collectively evaluated 6,706 6,185
Commercial Portfolio Segment [Member] | Agricultural [Member]    
Loans individually evaluated for impairment
Allowance for loans individually evaluated
Loans collectively evaluated for impairment 6,096 6,028
Allowance for loans collectively evaluated 44 43
Commercial Portfolio Segment [Member] | Farmland [Member]    
Loans individually evaluated for impairment 940 981
Allowance for loans individually evaluated 50 18
Loans collectively evaluated for impairment 26,957 31,145
Allowance for loans collectively evaluated 130 151
Consumer Real Estate Portfolio Segment [Member]    
Loans individually evaluated for impairment 8,259 5,456
Allowance for loans individually evaluated 754 770
Loans collectively evaluated for impairment 659,766 667,816
Allowance for loans collectively evaluated 5,053 4,717
Consumer Real Estate Portfolio Segment [Member] | Home Equity Lines [Member]    
Loans individually evaluated for impairment
Allowance for loans individually evaluated
Loans collectively evaluated for impairment 116,468 122,000
Allowance for loans collectively evaluated 825 895
Consumer Real Estate Portfolio Segment [Member] | Single Family Owner Occupied [Member]    
Loans individually evaluated for impairment 8,259 5,120
Allowance for loans individually evaluated 754 770
Loans collectively evaluated for impairment 496,264 501,617
Allowance for loans collectively evaluated 3,852 3,594
Consumer Real Estate Portfolio Segment [Member] | Owner Occupied Construction [Member]    
Loans individually evaluated for impairment 336
Allowance for loans individually evaluated
Loans collectively evaluated for impairment 47,034 44,199
Allowance for loans collectively evaluated 376 228
Consumer and Other Portfolio Segment [Member]    
Loans individually evaluated for impairment
Allowance for loans individually evaluated
Loans collectively evaluated for impairment 75,551 81,495
Allowance for loans collectively evaluated 795 759
Consumer and Other Portfolio Segment [Member] | Consumer Loan [Member]    
Loans individually evaluated for impairment
Allowance for loans individually evaluated
Loans collectively evaluated for impairment 70,695 77,524
Allowance for loans collectively evaluated 795 759
Consumer and Other Portfolio Segment [Member] | Other Loan [Member]    
Loans individually evaluated for impairment
Allowance for loans individually evaluated
Loans collectively evaluated for impairment 4,856 3,971
Allowance for loans collectively evaluated