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Investment securities - Pledged Securities (Details) - USD ($) $ in Millions | Mar. 31, 2024 | Dec. 31, 2023
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Available-for-sale and Held-to-maturity securities |  |
Carrying value of securities pledged | Assets pledged as collateral | Assets pledged as collateral
Collateral Pledged |  |
Available-for-sale and Held-to-maturity securities |  |
Carrying value of securities pledged | $ 318.8 | $ 322.4
U.S. government-sponsored enterprises |  |
Available-for-sale and Held-to-maturity securities |  |
Maximum percentage of stockholders' equity exceeded for securities of any individual issuer | 10.00% |

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