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Investment securities - Pledged Securities (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
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 $ 195,104 $ 165,982