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Note 3 - Loans and Allowance for Loan Losses - Summary of PCI Loans (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Carrying amount of PCI $ 556 $ 630
Residential Mortgage Segment [Member] | Residential Loan [Member]    
Carrying amount of PCI 383 390
Residential Mortgage Segment [Member] | Commercial Real Estate Loan [Member]    
Carrying amount of PCI $ 173 $ 240