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Note 6 - Loans (Details) - Impaired Loans by Loan Class - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
With no related allowance recorded:    
Recorded investment with no related allowance recorded $ 18,562 $ 21,500
Unpaid principle balance with no related allowance recorded 23,508 32,353
Residential real estate:    
Recorded investment with an allowance recorded 4,343 9,908
Unpaid principle balance with an allowance recorded 4,406 10,635
Related allowance 789 1,556
Subtotal:    
Recorded investment 22,905 31,408
Unpaid principle balance 27,914 42,988
Related allowance 789 1,556
Commercial Portfolio Segment [Member]    
With no related allowance recorded:    
Recorded investment with no related allowance recorded 1,772 4,298
Unpaid principle balance with no related allowance recorded 2,349 8,461
Residential real estate:    
Recorded investment with an allowance recorded 790 2,299
Unpaid principle balance with an allowance recorded 838 2,317
Related allowance 134 314
Subtotal:    
Recorded investment 2,562 6,597
Unpaid principle balance 3,187 10,778
Related allowance 134 314
Commercial Real Estate Portfolio Segment [Member]    
Residential real estate:    
Related allowance 59 432
Subtotal:    
Recorded investment 8,262 11,753
Unpaid principle balance 9,988 16,373
Related allowance 59 432
Commercial Real Estate Portfolio Segment [Member] | Commercial Non-owner Occupied [Member]    
With no related allowance recorded:    
Recorded investment with no related allowance recorded 5,154 6,909
Unpaid principle balance with no related allowance recorded 6,157 10,207
Residential real estate:    
Recorded investment with an allowance recorded 828 2,248
Unpaid principle balance with an allowance recorded 828 2,846
Related allowance 39 411
Subtotal:    
Related allowance 39 411
Commercial Real Estate Portfolio Segment [Member] | Commercial Owner Occupied Loan [Member]    
With no related allowance recorded:    
Recorded investment with no related allowance recorded 1,928 1,378
Unpaid principle balance with no related allowance recorded 2,651 2,102
Residential real estate:    
Recorded investment with an allowance recorded 352 1,218
Unpaid principle balance with an allowance recorded 352 1,218
Related allowance 20 21
Subtotal:    
Related allowance 20 21
Residential Portfolio Segment [Member]    
Residential real estate:    
Related allowance 583 795
Subtotal:    
Recorded investment 12,048 13,023
Unpaid principle balance 14,706 15,802
Related allowance 583 795
Residential Portfolio Segment [Member] | Home Equity Loan [Member]    
With no related allowance recorded:    
Recorded investment with no related allowance recorded 165 201
Unpaid principle balance with no related allowance recorded 167 202
Residential real estate:    
Recorded investment with an allowance recorded 563 579
Unpaid principle balance with an allowance recorded 564 579
Related allowance 282 289
Subtotal:    
Related allowance 282 289
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 7,874 7,106
Unpaid principle balance with no related allowance recorded 9,555 8,803
Residential real estate:    
Recorded investment with an allowance recorded 1,777 3,002
Unpaid principle balance with an allowance recorded 1,791 3,103
Related allowance 301 503
Subtotal:    
Related allowance 301 503
Residential Portfolio Segment [Member] | Mortgage Receivable [Member] | Real Estate Loan [Member]    
With no related allowance recorded:    
Recorded investment with no related allowance recorded   1,608
Unpaid principle balance with no related allowance recorded   2,578
Residential real estate:    
Recorded investment with an allowance recorded 1,669 527
Unpaid principle balance with an allowance recorded 2,629 537
Related allowance   3
Subtotal:    
Related allowance   3
Consumer Portfolio Segment [Member]    
Residential real estate:    
Recorded investment with an allowance recorded 33 35
Unpaid principle balance with an allowance recorded 33 35
Related allowance 13 15
Subtotal:    
Recorded investment 33 35
Unpaid principle balance 33 35
Related allowance $ 13 $ 15