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Investment securities - Pledged Securities (Details) - USD ($)
$ in Millions
Sep. 30, 2022
Jun. 30, 2022
Dec. 31, 2021
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 $ 165.1   $ 203.6
U.S. Government-sponsored enterprises state and municipals      
Available-for-sale and Held-to-maturity securities      
Maximum percentage of stockholders' equity exceeded for securities of any individual issuer 10.00%   10.00%