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Note 4 - Loans and Allowance for Loan Losses - Summary of PCI Loans (Details) - Purchased Credit Impaired Loans [Member] - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Residential Portfolio Segment [Member]    
Residential real estate $ 377 $ 884
Commercial Portfolio Segment [Member]    
Residential real estate 249 466
Residential real estate 626 1,350
Allowance for loan losses
Carrying amount, net of allowance $ 626 $ 1,350