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Note D - Loans and Allowance for Loan Losses - TDR Loan Modifications (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Troubled Debt Restructuring $ 16,043 $ 16,053
Interest Only Payments [Member] | Commercial Real Estate Owner Occupied [Member]    
Troubled Debt Restructuring 284  
Interest Only Payments [Member] | Commercial Real Estate Nonowner Occupied [Member]    
Troubled Debt Restructuring 2,810  
Contractual Interest Rate Reduction [Member] | Commercial Real Estate Owner Occupied [Member]    
Troubled Debt Restructuring 232  
Contractual Interest Rate Reduction [Member] | Commercial Real Estate Nonowner Occupied [Member]    
Troubled Debt Restructuring 384  
Reduction of Principal and Interest Payments [Member] | Commercial Real Estate Owner Occupied [Member]    
Troubled Debt Restructuring 579  
Extended Maturity [Member] | Commercial Real Estate Owner Occupied [Member]    
Troubled Debt Restructuring 1,582  
Interest Rate Below Market Reduction [Member] | Commercial Real Estate Owner Occupied [Member]    
Troubled Debt Restructuring 574  
Interest Rate Below Market Reduction [Member] | Commercial Real Estate Nonowner Occupied [Member]    
Troubled Debt Restructuring 391  
Residential Portfolio Segment [Member] | Interest Only Payments [Member]    
Troubled Debt Restructuring 717 1,001
Commercial Real Estate Portfolio Segment [Member] | Interest Only Payments [Member] | Commercial Real Estate Owner Occupied [Member]    
Troubled Debt Restructuring   433
Commercial Real Estate Portfolio Segment [Member] | Interest Only Payments [Member] | Commercial Real Estate Nonowner Occupied [Member]    
Troubled Debt Restructuring   2,773
Commercial Real Estate Portfolio Segment [Member] | Contractual Interest Rate Reduction [Member] | Commercial Real Estate Owner Occupied [Member]    
Troubled Debt Restructuring   232
Commercial Real Estate Portfolio Segment [Member] | Contractual Interest Rate Reduction [Member] | Commercial Real Estate Nonowner Occupied [Member]    
Troubled Debt Restructuring   396
Commercial Real Estate Portfolio Segment [Member] | Reduction of Principal and Interest Payments [Member] | Commercial Real Estate Owner Occupied [Member]    
Troubled Debt Restructuring   604
Commercial Real Estate Portfolio Segment [Member] | Extended Maturity [Member] | Commercial Real Estate Owner Occupied [Member]    
Troubled Debt Restructuring   1,996
Commercial Real Estate Portfolio Segment [Member] | Interest Rate Below Market Reduction [Member] | Commercial Real Estate Owner Occupied [Member]    
Troubled Debt Restructuring   204
Commercial and Industrial Portfolio Segment [Member] | Interest Only Payments [Member]    
Troubled Debt Restructuring   7,579
Commercial and Industrial Portfolio Segment [Member] | Interest Only Payments [Member] | Commercial Real Estate Nonowner Occupied [Member]    
Troubled Debt Restructuring 8,074  
Commercial and Industrial Portfolio Segment [Member] | Interest Rate Below Market Reduction [Member]    
Troubled Debt Restructuring   617
Commercial and Industrial Portfolio Segment [Member] | Interest Rate Below Market Reduction [Member] | Commercial Real Estate Nonowner Occupied [Member]    
Troubled Debt Restructuring 203  
Consumer Portfolio Segment [Member] | Extended Maturity [Member] | Home Equity Loan [Member]    
Troubled Debt Restructuring 213 218
Performing Financial Instruments [Member]    
Troubled Debt Restructuring 13,210 12,957
Performing Financial Instruments [Member] | Interest Only Payments [Member] | Commercial Real Estate Owner Occupied [Member]    
Troubled Debt Restructuring 284  
Performing Financial Instruments [Member] | Interest Only Payments [Member] | Commercial Real Estate Nonowner Occupied [Member]    
Troubled Debt Restructuring 600  
Performing Financial Instruments [Member] | Contractual Interest Rate Reduction [Member] | Commercial Real Estate Nonowner Occupied [Member]    
Troubled Debt Restructuring 384  
Performing Financial Instruments [Member] | Reduction of Principal and Interest Payments [Member] | Commercial Real Estate Owner Occupied [Member]    
Troubled Debt Restructuring 579  
Performing Financial Instruments [Member] | Extended Maturity [Member] | Commercial Real Estate Owner Occupied [Member]    
Troubled Debt Restructuring 1,582  
Performing Financial Instruments [Member] | Interest Rate Below Market Reduction [Member] | Commercial Real Estate Owner Occupied [Member]    
Troubled Debt Restructuring 574  
Performing Financial Instruments [Member] | Interest Rate Below Market Reduction [Member] | Commercial Real Estate Nonowner Occupied [Member]    
Troubled Debt Restructuring  
Performing Financial Instruments [Member] | Residential Portfolio Segment [Member] | Interest Only Payments [Member]    
Troubled Debt Restructuring 717 1,001
Performing Financial Instruments [Member] | Commercial Real Estate Portfolio Segment [Member] | Interest Only Payments [Member] | Commercial Real Estate Owner Occupied [Member]    
Troubled Debt Restructuring   433
Performing Financial Instruments [Member] | Commercial Real Estate Portfolio Segment [Member] | Interest Only Payments [Member] | Commercial Real Estate Nonowner Occupied [Member]    
Troubled Debt Restructuring   300
Performing Financial Instruments [Member] | Commercial Real Estate Portfolio Segment [Member] | Contractual Interest Rate Reduction [Member] | Commercial Real Estate Nonowner Occupied [Member]    
Troubled Debt Restructuring   396
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   604
Performing Financial Instruments [Member] | Commercial Real Estate Portfolio Segment [Member] | Extended Maturity [Member] | Commercial Real Estate Owner Occupied [Member]    
Troubled Debt Restructuring   1,996
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   204
Performing Financial Instruments [Member] | Commercial and Industrial Portfolio Segment [Member] | Interest Only Payments [Member]    
Troubled Debt Restructuring   7,579
Performing Financial Instruments [Member] | Commercial and Industrial Portfolio Segment [Member] | Interest Only Payments [Member] | Commercial Real Estate Nonowner Occupied [Member]    
Troubled Debt Restructuring 8,074  
Performing Financial Instruments [Member] | Commercial and Industrial Portfolio Segment [Member] | Interest Rate Below Market Reduction [Member]    
Troubled Debt Restructuring   226
Performing Financial Instruments [Member] | Commercial and Industrial Portfolio Segment [Member] | Interest Rate Below Market Reduction [Member] | Commercial Real Estate Nonowner Occupied [Member]    
Troubled Debt Restructuring 203  
Performing Financial Instruments [Member] | Consumer Portfolio Segment [Member] | Extended Maturity [Member] | Home Equity Loan [Member]    
Troubled Debt Restructuring 213 218
Nonperforming Financial Instruments [Member]    
Troubled Debt Restructuring 2,833 3,096
Nonperforming Financial Instruments [Member] | Interest Only Payments [Member] | Commercial Real Estate Nonowner Occupied [Member]    
Troubled Debt Restructuring 2,210  
Nonperforming Financial Instruments [Member] | Contractual Interest Rate Reduction [Member] | Commercial Real Estate Owner Occupied [Member]    
Troubled Debt Restructuring 232  
Nonperforming Financial Instruments [Member] | Interest Rate Below Market Reduction [Member] | Commercial Real Estate Nonowner Occupied [Member]    
Troubled Debt Restructuring 391  
Nonperforming Financial Instruments [Member] | Commercial Real Estate Portfolio Segment [Member] | Interest Only Payments [Member] | Commercial Real Estate Nonowner Occupied [Member]    
Troubled Debt Restructuring   2,473
Nonperforming Financial Instruments [Member] | Commercial Real Estate Portfolio Segment [Member] | Contractual Interest Rate Reduction [Member] | Commercial Real Estate Owner Occupied [Member]    
Troubled Debt Restructuring   232
Nonperforming Financial Instruments [Member] | Commercial and Industrial Portfolio Segment [Member] | Interest Rate Below Market Reduction [Member]    
Troubled Debt Restructuring   $ 391
Nonperforming Financial Instruments [Member] | Commercial and Industrial Portfolio Segment [Member] | Interest Rate Below Market Reduction [Member] | Commercial Real Estate Nonowner Occupied [Member]    
Troubled Debt Restructuring