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Note 5 - Loans (Details) - Impaired Loans by Loan Class - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
With no related allowance recorded:    
Recorded investment with no related allowance recorded $ 16,821 $ 21,500
Unpaid principal balance with no related allowance recorded 21,118 32,353
With an allowance recorded:    
Recorded investment with a related allowance recorded 4,569 9,908
Unpaid principal balance with a related allowance recorded 4,673 10,635
Related allowance 832 1,556
Subtotal:    
Recorded investment 21,390 31,408
Unpaid principle balance 25,791 42,988
Related allowance 832 1,556
Commercial Portfolio Segment [Member]    
With no related allowance recorded:    
Recorded investment with no related allowance recorded 1,282 4,298
Unpaid principal balance with no related allowance recorded 1,519 8,461
With an allowance recorded:    
Recorded investment with a related allowance recorded 761 2,299
Unpaid principal balance with a related allowance recorded 820 2,317
Related allowance 122 314
Subtotal:    
Recorded investment 2,043 6,597
Unpaid principle balance 2,339 10,778
Related allowance 122 314
Commercial Real Estate Portfolio Segment [Member]    
With an allowance recorded:    
Related allowance 97 432
Subtotal:    
Recorded investment 7,733 11,753
Unpaid principle balance 9,194 16,373
Related allowance 97 432
Commercial Real Estate Portfolio Segment [Member] | Commercial Non-owner Occupied [Member]    
With no related allowance recorded:    
Recorded investment with no related allowance recorded 5,488 6,909
Unpaid principal balance with no related allowance recorded 6,226 10,207
With an allowance recorded:    
Recorded investment with a related allowance recorded 824 2,248
Unpaid principal balance with a related allowance recorded 824 2,846
Related allowance 35 411
Subtotal:    
Related allowance 35 411
Commercial Real Estate Portfolio Segment [Member] | Commercial Owner Occupied Loan [Member]    
With no related allowance recorded:    
Recorded investment with no related allowance recorded 1,071 1,378
Unpaid principal balance with no related allowance recorded 1,794 2,102
With an allowance recorded:    
Recorded investment with a related allowance recorded 350 1,218
Unpaid principal balance with a related allowance recorded 350 1,218
Related allowance 62 21
Subtotal:    
Related allowance 62 21
Residential Portfolio Segment [Member]    
With an allowance recorded:    
Related allowance 600 795
Subtotal:    
Recorded investment 11,582 13,023
Unpaid principle balance 14,226 15,802
Related allowance 600 795
Residential Portfolio Segment [Member] | Home Equity Loan [Member]    
With no related allowance recorded:    
Recorded investment with no related allowance recorded 142 201
Unpaid principal balance with no related allowance recorded 142 202
With an allowance recorded:    
Recorded investment with a related allowance recorded 558 579
Unpaid principal balance with a related allowance recorded 558 579
Related allowance 279 289
Subtotal:    
Related allowance 279 289
Residential Portfolio Segment [Member] | Individual Tax Identification Number Loan [Member] | Real Estate Loan [Member]    
With no related allowance recorded:    
Recorded investment with no related allowance recorded 7,063 7,106
Unpaid principal balance with no related allowance recorded 8,662 8,803
With an allowance recorded:    
Recorded investment with a related allowance recorded 2,044 3,002
Unpaid principal balance with a related allowance recorded 2,089 3,103
Related allowance 321 503
Subtotal:    
Related allowance 321 503
Residential Portfolio Segment [Member] | Mortgage Receivable [Member] | Real Estate Loan [Member]    
With no related allowance recorded:    
Recorded investment with no related allowance recorded 1,775 1,608
Unpaid principal balance with no related allowance recorded 2,775 2,578
With an allowance recorded:    
Recorded investment with a related allowance recorded   527
Unpaid principal balance with a related allowance recorded   537
Related allowance   3
Subtotal:    
Related allowance   3
Consumer Portfolio Segment [Member]    
With an allowance recorded:    
Recorded investment with a related allowance recorded 32 35
Unpaid principal balance with a related allowance recorded 32 35
Related allowance 13 15
Subtotal:    
Recorded investment 32 35
Unpaid principle balance 32 35
Related allowance $ 13 $ 15