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Note 5 - Loans and Allowance for Credit Losses - Impaired Loans (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Unpaid Contractual Principal Balance $ 24,925 $ 44,735 $ 28,468
Recorded Investment With No Allowance 8,779 11,896 11,361
Recorded Investment With Allowance 13,477 28,695 14,438
Total Recorded Investment 22,256 40,591 25,799
Related Allowance 5,268 4,548 5,599
Quarter to Date [Member]      
Average Recorded Investment 24,030 36,055 37,052
Interest Income Recognized 90 74 135
Year to Date [Member]      
Average Recorded Investment 24,030 36,055 37,938
Interest Income Recognized 90 74 406
Commercial Portfolio Segment [Member]      
Unpaid Contractual Principal Balance 8,249 17,305 8,296
Recorded Investment With No Allowance 2,843 1,165 2,532
Recorded Investment With Allowance 2,737 11,996 3,095
Total Recorded Investment 5,580 13,161 5,627
Related Allowance 3,030 2,922 2,671
Commercial Portfolio Segment [Member] | Quarter to Date [Member]      
Average Recorded Investment 5,604 12,920 12,620
Interest Income Recognized 42 16 79
Commercial Portfolio Segment [Member] | Year to Date [Member]      
Average Recorded Investment 5,604 12,920 12,755
Interest Income Recognized 42 16 191
Income Producing Portfolio Segment [Member]      
Unpaid Contractual Principal Balance 10,019 19,905 14,936
Recorded Investment With No Allowance 702 5,143 5,048
Recorded Investment With Allowance 9,317 14,762 9,888
Total Recorded Investment 10,019 19,905 14,936
Related Allowance 1,488 868 1,943
Income Producing Portfolio Segment [Member] | Quarter to Date [Member]      
Average Recorded Investment 12,478 13,012 16,742
Interest Income Recognized 48 58 54
Income Producing Portfolio Segment [Member] | Year to Date [Member]      
Average Recorded Investment 12,478 13,012 17,533
Interest Income Recognized 48 58 198
Owner Occupied Portfolio Segment [Member]      
Unpaid Contractual Principal Balance 2,998 1,724 2,483
Recorded Investment With No Allowance 2,207 461 1,691
Recorded Investment With Allowance 791 1,263 792
Total Recorded Investment 2,998 1,724 2,483
Related Allowance 350 360 350
Owner Occupied Portfolio Segment [Member] | Quarter to Date [Member]      
Average Recorded Investment 2,741 1,739 2,233
Interest Income Recognized
Owner Occupied Portfolio Segment [Member] | Year to Date [Member]      
Average Recorded Investment 2,741 1,739 2,106
Interest Income Recognized 13
Residential Portfolio Segment [Member]      
Unpaid Contractual Principal Balance 310 257 555
Recorded Investment With No Allowance 310 257 555
Recorded Investment With Allowance
Total Recorded Investment 310 257 555
Related Allowance
Residential Portfolio Segment [Member] | Quarter to Date [Member]      
Average Recorded Investment 433 293 246
Interest Income Recognized
Residential Portfolio Segment [Member] | Year to Date [Member]      
Average Recorded Investment 433 293 249
Interest Income Recognized
Construction Portfolio Segment [Member]      
Unpaid Contractual Principal Balance 3,255 5,422 2,072
Recorded Investment With No Allowance 2,717 4,870 1,535
Recorded Investment With Allowance 538 552 537
Total Recorded Investment 3,255 5,422 2,072
Related Allowance 350 310 522
Construction Portfolio Segment [Member] | Quarter to Date [Member]      
Average Recorded Investment 2,664 7,938 5,091
Interest Income Recognized
Construction Portfolio Segment [Member] | Year to Date [Member]      
Average Recorded Investment 2,664 7,938 5,174
Interest Income Recognized
Home Equity Portfolio Segment [Member]      
Unpaid Contractual Principal Balance 122
Recorded Investment With No Allowance
Recorded Investment With Allowance 122
Total Recorded Investment 122
Related Allowance 88
Home Equity Portfolio Segment [Member] | Quarter to Date [Member]      
Average Recorded Investment 142 78
Interest Income Recognized
Home Equity Portfolio Segment [Member] | Year to Date [Member]      
Average Recorded Investment 142 89
Interest Income Recognized
Other Consumer Portfolio Segment [Member]      
Unpaid Contractual Principal Balance 94 126
Recorded Investment With No Allowance
Recorded Investment With Allowance 94 126
Total Recorded Investment 94 126
Related Allowance 50 113
Other Consumer Portfolio Segment [Member] | Quarter to Date [Member]      
Average Recorded Investment 110 11 42
Interest Income Recognized 2
Other Consumer Portfolio Segment [Member] | Year to Date [Member]      
Average Recorded Investment 110 11 32
Interest Income Recognized $ 4