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Note 4 - Summary of PCI Loans (Details) - Purchased Credit Impaired Loans [Member] - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Residential Portfolio Segment [Member]    
Residential real estate $ 510 $ 884
Commercial Portfolio Segment [Member]    
Residential real estate 397 466
Residential real estate 907 $ 1,350
Allowance for loan losses (6)
Carrying amount, net of allowance $ 901 $ 1,350