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Fair value estimates - Schedule of Assets and Liabilities Measured at Fair Value on Nonrecurring Basis (Details) - Nonrecurring Basis - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Impaired loans $ 5,801 $ 4,944
Other real estate owned 1,256 878
Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Impaired loans 5,801 4,944
Other real estate owned $ 1,256 $ 878