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Investment securities - Pledged Securities (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Investment securities    
Carrying value of securities pledged $ 161,647 $ 163,936
Carrying value of securities pledged us-gaap:AssetPledgedAsCollateralMember us-gaap:AssetPledgedAsCollateralMember