v3.26.1
Investment securities - Pledged Securities (Details) - USD ($)
$ in Millions
Mar. 31, 2026
Dec. 31, 2025
Collateral Pledged    
Available-for-sale and Held-to-maturity securities    
Carrying value of securities pledged $ 370.6 $ 381.8
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%