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Note 4 - Loans and Allowance for Loan Losses - TDR Loan Modifications (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Troubled Debt Restructuring $ 9,935 $ 16,942
Residential Portfolio Segment [Member] | Interest Only Payments [Member]    
Troubled Debt Restructuring 218 697
Residential Portfolio Segment [Member] | Extended Maturity [Member]    
Troubled Debt Restructuring 488  
Residential Portfolio Segment [Member] | Interest Rate Below Market Reduction [Member]    
Troubled Debt Restructuring 404  
Commercial Real Estate Portfolio Segment [Member] | Interest Only Payments [Member] | Commercial Real Estate Owner Occupied [Member]    
Troubled Debt Restructuring 989 997
Commercial Real Estate Portfolio Segment [Member] | Interest Only Payments [Member] | Commercial Real Estate Nonowner Occupied [Member]    
Troubled Debt Restructuring 948 2,521
Commercial Real Estate Portfolio Segment [Member] | Reduction of Principal and Interest Payments [Member] | Commercial Real Estate Owner Occupied [Member]    
Troubled Debt Restructuring 535 554
Commercial Real Estate Portfolio Segment [Member] | Extended Maturity [Member] | Commercial Real Estate Owner Occupied [Member]    
Troubled Debt Restructuring   1,466
Commercial Real Estate Portfolio Segment [Member] | Interest Rate Below Market Reduction [Member] | Commercial Real Estate Owner Occupied [Member]    
Troubled Debt Restructuring   410
Commercial Real Estate Portfolio Segment [Member] | Interest Rate Below Market Reduction [Member] | Commercial Real Estate Nonowner Occupied [Member]    
Troubled Debt Restructuring 563  
Commercial Real Estate Portfolio Segment [Member] | Contractual Interest Rate Reduction [Member] | Commercial Real Estate Owner Occupied [Member]    
Troubled Debt Restructuring   372
Commercial Real Estate Portfolio Segment [Member] | Contractual Interest Rate Reduction [Member] | Commercial Real Estate Nonowner Occupied [Member]    
Troubled Debt Restructuring 363  
Commercial and Industrial Portfolio Segment [Member] | Interest Only Payments [Member]    
Troubled Debt Restructuring 5,427 9,154
Commercial and Industrial Portfolio Segment [Member] | Interest Rate Below Market Reduction [Member]    
Troubled Debt Restructuring   570
Consumer Portfolio Segment [Member] | Extended Maturity [Member] | Home Equity Loan [Member]    
Troubled Debt Restructuring   201
Performing Financial Instruments [Member]    
Troubled Debt Restructuring 8,987 14,780
Performing Financial Instruments [Member] | Residential Portfolio Segment [Member] | Interest Only Payments [Member]    
Troubled Debt Restructuring 218 697
Performing Financial Instruments [Member] | Residential Portfolio Segment [Member] | Extended Maturity [Member]    
Troubled Debt Restructuring 488  
Performing Financial Instruments [Member] | Residential Portfolio Segment [Member] | Interest Rate Below Market Reduction [Member]    
Troubled Debt Restructuring 404  
Performing Financial Instruments [Member] | Commercial Real Estate Portfolio Segment [Member] | Interest Only Payments [Member] | Commercial Real Estate Owner Occupied [Member]    
Troubled Debt Restructuring 989 997
Performing Financial Instruments [Member] | Commercial Real Estate Portfolio Segment [Member] | Interest Only Payments [Member] | Commercial Real Estate Nonowner Occupied [Member]    
Troubled Debt Restructuring 560
Performing Financial Instruments [Member] | Commercial Real Estate Portfolio Segment [Member] | Reduction of Principal and Interest Payments [Member] | Commercial Real Estate Owner Occupied [Member]    
Troubled Debt Restructuring 535 554
Performing Financial Instruments [Member] | Commercial Real Estate Portfolio Segment [Member] | Extended Maturity [Member] | Commercial Real Estate Owner Occupied [Member]    
Troubled Debt Restructuring   1,466
Performing Financial Instruments [Member] | Commercial Real Estate Portfolio Segment [Member] | Interest Rate Below Market Reduction [Member] | Commercial Real Estate Owner Occupied [Member]    
Troubled Debt Restructuring   410
Performing Financial Instruments [Member] | Commercial Real Estate Portfolio Segment [Member] | Interest Rate Below Market Reduction [Member] | Commercial Real Estate Nonowner Occupied [Member]    
Troubled Debt Restructuring 563  
Performing Financial Instruments [Member] | Commercial Real Estate Portfolio Segment [Member] | Contractual Interest Rate Reduction [Member] | Commercial Real Estate Owner Occupied [Member]    
Troubled Debt Restructuring   372
Performing Financial Instruments [Member] | Commercial Real Estate Portfolio Segment [Member] | Contractual Interest Rate Reduction [Member] | Commercial Real Estate Nonowner Occupied [Member]    
Troubled Debt Restructuring 363  
Performing Financial Instruments [Member] | Commercial and Industrial Portfolio Segment [Member] | Interest Only Payments [Member]    
Troubled Debt Restructuring 5,427 9,154
Performing Financial Instruments [Member] | Commercial and Industrial Portfolio Segment [Member] | Interest Rate Below Market Reduction [Member]    
Troubled Debt Restructuring   570
Performing Financial Instruments [Member] | Consumer Portfolio Segment [Member] | Extended Maturity [Member] | Home Equity Loan [Member]    
Troubled Debt Restructuring  
Nonperforming Financial Instruments [Member]    
Troubled Debt Restructuring 948 2,162
Nonperforming Financial Instruments [Member] | Commercial Real Estate Portfolio Segment [Member] | Interest Only Payments [Member] | Commercial Real Estate Nonowner Occupied [Member]    
Troubled Debt Restructuring $ 948 1,961
Nonperforming Financial Instruments [Member] | Consumer Portfolio Segment [Member] | Extended Maturity [Member] | Home Equity Loan [Member]    
Troubled Debt Restructuring   $ 201