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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, 2017
Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Impaired loans $ 1,798 $ 3,193
Other real estate owned 213 371
Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Impaired loans 1,798 3,193
Other real estate owned $ 213 $ 371