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Fair value of financial instruments - Schedule of Assets and Liabilities Measured at Fair Value on Nonrecurring Basis (Details) - Nonrecurring Fair Value Measurements [Member] - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans	$ 4,944	$ 4,414
Other real estate owned	878	218
Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans	4,944	4,414
Other real estate owned	$ 878	$ 218

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Fair value disclosure of impaired loans at the end of the period.

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Fair value disclosure of other real estate owned at the end of the period.

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