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Note 5 - Loans and Allowance for Credit Losses - Impaired Loans (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Unpaid Contractual Principal Balance $ 28,468 $ 29,212 $ 28,468 $ 29,212
Recorded Investment With No Allowance 11,361 4,997 11,361 4,997
Recorded Investment With Allowance 14,438 20,078 14,438 20,078
Total Recorded Investment 25,799 25,075 25,799 25,075
Related Allowance 5,599 5,902 5,599 5,902
Quarter to Date [Member]        
Average Recorded Investment 37,052 30,607    
Interest Income Recognized     135 22
Year to Date [Member]        
Average Recorded Investment 37,938 30,688    
Interest Income Recognized     406 629
Commercial Portfolio Segment [Member]        
Unpaid Contractual Principal Balance 8,296 9,555 8,296 9,555
Recorded Investment With No Allowance 2,532 2,396 2,532 2,396
Recorded Investment With Allowance 3,095 3,715 3,095 3,715
Total Recorded Investment 5,627 6,111 5,627 6,111
Related Allowance 2,671 3,478 2,671 3,478
Commercial Portfolio Segment [Member] | Quarter to Date [Member]        
Average Recorded Investment 12,620 9,671    
Interest Income Recognized     79 21
Commercial Portfolio Segment [Member] | Year to Date [Member]        
Average Recorded Investment 12,755 10,309    
Interest Income Recognized     191 69
Income Producing Portfolio Segment [Member]        
Unpaid Contractual Principal Balance 14,936 11,814 14,936 11,814
Recorded Investment With No Allowance 5,048 1,190 5,048 1,190
Recorded Investment With Allowance 9,888 9,931 9,888 9,931
Total Recorded Investment 14,936 11,121 14,936 11,121
Related Allowance 1,943 1,033 1,943 1,033
Income Producing Portfolio Segment [Member] | Quarter to Date [Member]        
Average Recorded Investment 16,742 10,675    
Interest Income Recognized     54 95
Income Producing Portfolio Segment [Member] | Year to Date [Member]        
Average Recorded Investment 17,533 10,294    
Interest Income Recognized     198 354
Owner Occupied Portfolio Segment [Member]        
Unpaid Contractual Principal Balance 2,483 1,753 2,483 1,753
Recorded Investment With No Allowance 1,691 946 1,691 946
Recorded Investment With Allowance 792 807 792 807
Total Recorded Investment 2,483 1,753 2,483 1,753
Related Allowance 350 400 350 400
Owner Occupied Portfolio Segment [Member] | Quarter to Date [Member]        
Average Recorded Investment 2,233 1,772    
Interest Income Recognized    
Owner Occupied Portfolio Segment [Member] | Year to Date [Member]        
Average Recorded Investment 2,106 1,810    
Interest Income Recognized     13
Residential Portfolio Segment [Member]        
Unpaid Contractual Principal Balance 555 329 555 329
Recorded Investment With No Allowance 555 329 555 329
Recorded Investment With Allowance
Total Recorded Investment 555 329 555 329
Related Allowance
Average Recorded Investment      
Interest Income Recognized      
Residential Portfolio Segment [Member] | Quarter to Date [Member]        
Average Recorded Investment 246      
Interest Income Recognized      
Residential Portfolio Segment [Member] | Year to Date [Member]        
Average Recorded Investment 249      
Interest Income Recognized      
Construction Portfolio Segment [Member]        
Unpaid Contractual Principal Balance 2,072 5,577 2,072 5,577
Recorded Investment With No Allowance 1,535 1,535
Recorded Investment With Allowance 537 5,577 537 5,577
Total Recorded Investment 2,072 5,577 2,072 5,577
Related Allowance 522 950 522 950
Construction Portfolio Segment [Member] | Quarter to Date [Member]        
Average Recorded Investment 5,091 8,031    
Interest Income Recognized     (93)
Construction Portfolio Segment [Member] | Year to Date [Member]        
Average Recorded Investment 5,174 7,594    
Interest Income Recognized     205
Home Equity Portfolio Segment [Member]        
Unpaid Contractual Principal Balance 161 161
Recorded Investment With No Allowance 116 116
Recorded Investment With Allowance 45 45
Total Recorded Investment 161 161
Related Allowance 38 38
Home Equity Portfolio Segment [Member] | Quarter to Date [Member]        
Average Recorded Investment 78 411    
Interest Income Recognized    
Home Equity Portfolio Segment [Member] | Year to Date [Member]        
Average Recorded Investment 89 650    
Interest Income Recognized    
Other Consumer Portfolio Segment [Member]        
Unpaid Contractual Principal Balance 126 23 126 23
Recorded Investment With No Allowance 20 20
Recorded Investment With Allowance 126 3 126 3
Total Recorded Investment 126 23 126 23
Related Allowance 113 3 113 3
Other Consumer Portfolio Segment [Member] | Quarter to Date [Member]        
Average Recorded Investment 42 47    
Interest Income Recognized     2 (1)
Other Consumer Portfolio Segment [Member] | Year to Date [Member]        
Average Recorded Investment $ 32 $ 31    
Interest Income Recognized     $ 4 $ 1