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Note 7 - Loans and Related Allowance for Loan and Lease Losses (Details) - Troubled Debt Restructurings Subsequently Defaulted
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
USD ($)
Sep. 30, 2014
Sep. 30, 2015
USD ($)
Sep. 30, 2014
Financing Receivable, Modifications [Line Items]        
Number of contracts   0   0
Commercial and Industrial [Member]        
Financing Receivable, Modifications [Line Items]        
Number of contracts 1   3  
Recorded investment $ 8   $ 55  
Consumer Portfolio Segment [Member]        
Financing Receivable, Modifications [Line Items]        
Number of contracts 1   1  
Recorded investment $ 8   $ 8  
Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member]        
Financing Receivable, Modifications [Line Items]        
Number of contracts     1  
Recorded investment     $ 152