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Investment securities - Pledged Securities (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Available-for-sale and Held-to-maturity securities    
Carrying value of securities pledged us-gaap:AssetPledgedAsCollateralMember us-gaap:AssetPledgedAsCollateralMember
Collateral Pledged    
Available-for-sale and Held-to-maturity securities    
Carrying value of securities pledged $ 157,047 $ 161,647