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Note 6 - Loans (Details) - Impaired Loans by Loan Class - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
With no related allowance recorded:    
Recorded investment with no related allowance recorded $ 19,136 $ 21,500
Unpaid principle balance with no related allowance recorded 24,052 32,353
With an allowance recorded:    
Recorded investment with an allowance recorded 5,864 9,908
Unpaid principle balance with an allowance recorded 6,691 10,635
Related allowance 1,275 1,556
Subtotal:    
Recorded investment 25,000 31,408
Unpaid principle balance 30,743 42,988
Related allowance 1,275 1,556
Commercial Portfolio Segment [Member]    
With no related allowance recorded:    
Recorded investment with no related allowance recorded 2,410 4,298
Unpaid principle balance with no related allowance recorded 2,944 8,461
With an allowance recorded:    
Recorded investment with an allowance recorded 771 2,299
Unpaid principle balance with an allowance recorded 809 2,317
Related allowance 149 314
Subtotal:    
Recorded investment 3,181 6,597
Unpaid principle balance 3,753 10,778
Related allowance 149 314
Commercial Real Estate Portfolio Segment [Member]    
With an allowance recorded:    
Related allowance 526 432
Subtotal:    
Recorded investment 9,645 11,753
Unpaid principle balance 12,057 16,373
Related allowance 526 432
Commercial Real Estate Portfolio Segment [Member] | Other Loan [Member]    
With no related allowance recorded:    
Recorded investment with no related allowance recorded 7,126 8,287
Unpaid principle balance with no related allowance recorded 8,855 12,309
With an allowance recorded:    
Recorded investment with an allowance recorded 2,519 3,466
Unpaid principle balance with an allowance recorded 3,202 4,064
Related allowance 526 432
Subtotal:    
Related allowance 526 432
Residential Portfolio Segment [Member]    
With an allowance recorded:    
Related allowance 586 795
Subtotal:    
Recorded investment 12,140 13,023
Unpaid principle balance 14,899 15,802
Related allowance 586 795
Residential Portfolio Segment [Member] | Real Estate Loan [Member]    
With no related allowance recorded:    
Recorded investment with no related allowance recorded 9,400 8,714
Unpaid principle balance with no related allowance recorded 12,052 11,381
With an allowance recorded:    
Recorded investment with an allowance recorded 1,971 3,529
Unpaid principle balance with an allowance recorded 2,077 3,640
Related allowance 302 506
Subtotal:    
Related allowance 302 506
Residential Portfolio Segment [Member] | Home Equity Loan [Member]    
With no related allowance recorded:    
Recorded investment with no related allowance recorded 200 201
Unpaid principle balance with no related allowance recorded 201 202
With an allowance recorded:    
Recorded investment with an allowance recorded 569 579
Unpaid principle balance with an allowance recorded 569 579
Related allowance 284 289
Subtotal:    
Related allowance 284 289
Consumer Portfolio Segment [Member]    
With an allowance recorded:    
Recorded investment with an allowance recorded 34 35
Unpaid principle balance with an allowance recorded 34 35
Related allowance 14 15
Subtotal:    
Recorded investment 34 35
Unpaid principle balance 34 35
Related allowance $ 14 $ 15