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Investment securities - Pledged Securities (Details) - USD ($) $ in Millions | Jun. 30, 2025 | Dec. 31, 2024
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Collateral Pledged |  |
Available-for-sale and Held-to-maturity securities |  |
Carrying value of securities pledged | $ 410.2 | $ 441.5
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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