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Note 3 - Loans (Details) - Loans Individually Evaluated for Impairment - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2015
Dec. 31, 2014
Loans with no related allowance recorded    
Loans with no related allowance recorded, recorded investment $ 3,918 $ 3,725
Loans with no related allowance recorded, unpaid principal balance 7,437 6,987
Loans with no related allowance recorded, average recorded investment 3,470 9,629
Loans with an allowance recorded    
Loans with an allowance recorded, recorded investment 6,735 7,826
Loans with an allowance recorded, unpaid principal balance 8,306 9,397
Related allowance 1,603 1,376
Loans with an allowance recorded, average recorded investment 7,436 9,068
Total    
Recorded investment 10,653 11,551
Unpaid principal balance 15,743 16,384
Related allowance 1,603 1,376
Average recorded investment 10,906 18,697
Commercial and Industrial Portfolio Segment [Member]    
Loans with no related allowance recorded    
Loans with no related allowance recorded, recorded investment 1,545 896
Loans with no related allowance recorded, unpaid principal balance 4,245 3,596
Loans with no related allowance recorded, average recorded investment 988 996
Loans with an allowance recorded    
Loans with an allowance recorded, recorded investment 5,233 6,343
Loans with an allowance recorded, unpaid principal balance 6,804 7,914
Related allowance 1,217 1,029
Loans with an allowance recorded, average recorded investment 5,387 6,797
Total    
Recorded investment 6,778 7,239
Unpaid principal balance 11,049 11,510
Related allowance 1,217 1,029
Average recorded investment 6,375 7,793
Construction and Development Excluding Undeveloped Land Portfolio Segment [Member]    
Loans with no related allowance recorded    
Loans with no related allowance recorded, recorded investment 26 26
Loans with no related allowance recorded, unpaid principal balance 151 151
Loans with no related allowance recorded, average recorded investment 26 26
Loans with an allowance recorded    
Loans with an allowance recorded, recorded investment 0 490
Loans with an allowance recorded, unpaid principal balance 0 490
Related allowance 0 15
Loans with an allowance recorded, average recorded investment 368 196
Total    
Recorded investment 26 516
Unpaid principal balance 151 641
Related allowance 0 15
Average recorded investment 394 222
Undevelopment Land Portfolio Segment [Member]    
Loans with no related allowance recorded    
Loans with no related allowance recorded, recorded investment 0 0
Loans with no related allowance recorded, unpaid principal balance 0 0
Loans with no related allowance recorded, average recorded investment 0 5,608
Loans with an allowance recorded    
Loans with an allowance recorded, recorded investment 0 0
Loans with an allowance recorded, unpaid principal balance 0 0
Related allowance 0 0
Loans with an allowance recorded, average recorded investment 0 0
Total    
Recorded investment 0 0
Unpaid principal balance 0 0
Related allowance 0 0
Average recorded investment 0 5,608
Real Estate Mortgage Portfolio Segment [Member]    
Loans with no related allowance recorded    
Loans with no related allowance recorded, recorded investment 2,332 2,803
Loans with no related allowance recorded, unpaid principal balance 3,026 3,240
Loans with no related allowance recorded, average recorded investment 2,452 2,999
Loans with an allowance recorded    
Loans with an allowance recorded, recorded investment 1,432 917
Loans with an allowance recorded, unpaid principal balance 1,432 917
Related allowance 316 256
Loans with an allowance recorded, average recorded investment 1,608 1,995
Total    
Recorded investment 3,764 3,720
Unpaid principal balance 4,458 4,157
Related allowance 316 256
Average recorded investment 4,060 4,994
Real Estate Mortgage Portfolio Segment [Member] | Commercial Investment [Member]    
Loans with no related allowance recorded    
Loans with no related allowance recorded, recorded investment 285 113
Loans with no related allowance recorded, unpaid principal balance 542 113
Loans with no related allowance recorded, average recorded investment 154 198
Loans with an allowance recorded    
Loans with an allowance recorded, recorded investment 0 122
Loans with an allowance recorded, unpaid principal balance 0 122
Related allowance 0 0
Loans with an allowance recorded, average recorded investment 92 640
Total    
Recorded investment 285 235
Unpaid principal balance 542 235
Related allowance 0 0
Average recorded investment 246 838
Real Estate Mortgage Portfolio Segment [Member] | Owner Occupied Commercial [Member]    
Loans with no related allowance recorded    
Loans with no related allowance recorded, recorded investment 1,603 1,784
Loans with no related allowance recorded, unpaid principal balance 2,040 2,221
Loans with no related allowance recorded, average recorded investment 1,591 1,939
Loans with an allowance recorded    
Loans with an allowance recorded, recorded investment 1,432 716
Loans with an allowance recorded, unpaid principal balance 1,432 716
Related allowance 316 112
Loans with an allowance recorded, average recorded investment 1,328 704
Total    
Recorded investment 3,035 2,500
Unpaid principal balance 3,472 2,937
Related allowance 316 112
Average recorded investment 2,919 2,643
Real Estate Mortgage Portfolio Segment [Member] | One to Four Family Residential [Member]    
Loans with no related allowance recorded    
Loans with no related allowance recorded, recorded investment 316 870
Loans with no related allowance recorded, unpaid principal balance 316 870
Loans with no related allowance recorded, average recorded investment 600 782
Loans with an allowance recorded    
Loans with an allowance recorded, recorded investment 0 79
Loans with an allowance recorded, unpaid principal balance 0 79
Related allowance 0 144
Loans with an allowance recorded, average recorded investment 188 651
Total    
Recorded investment 316 949
Unpaid principal balance 316 949
Related allowance 0 144
Average recorded investment 788 1,433
Real Estate Mortgage Portfolio Segment [Member] | Home Equity First Lien [Member]    
Loans with no related allowance recorded    
Loans with no related allowance recorded, recorded investment 91 0
Loans with no related allowance recorded, unpaid principal balance 91 0
Loans with no related allowance recorded, average recorded investment 43 11
Loans with an allowance recorded    
Loans with an allowance recorded, recorded investment 0 0
Loans with an allowance recorded, unpaid principal balance 0 0
Related allowance 0 0
Loans with an allowance recorded, average recorded investment 0 0
Total    
Recorded investment 91 0
Unpaid principal balance 91 0
Related allowance 0 0
Average recorded investment 43 11
Real Estate Mortgage Portfolio Segment [Member] | Home Equity Junior Lien [Member]    
Loans with no related allowance recorded    
Loans with no related allowance recorded, recorded investment 37 36
Loans with no related allowance recorded, unpaid principal balance 37 36
Loans with no related allowance recorded, average recorded investment 64 69
Loans with an allowance recorded    
Loans with an allowance recorded, recorded investment 0 0
Loans with an allowance recorded, unpaid principal balance 0 0
Related allowance 0 0
Loans with an allowance recorded, average recorded investment 0 0
Total    
Recorded investment 37 36
Unpaid principal balance 37 36
Related allowance 0 0
Average recorded investment 64 69
Consumer Portfolio Segment [Member]    
Loans with no related allowance recorded    
Loans with no related allowance recorded, recorded investment 15 0
Loans with no related allowance recorded, unpaid principal balance 15 0
Loans with no related allowance recorded, average recorded investment 4 0
Loans with an allowance recorded    
Loans with an allowance recorded, recorded investment 70 76
Loans with an allowance recorded, unpaid principal balance 70 76
Related allowance 70 76
Loans with an allowance recorded, average recorded investment 73 80
Total    
Recorded investment 85 76
Unpaid principal balance 85 76
Related allowance 70 76
Average recorded investment $ 77 $ 80