Supplemental disclosure on the consolidated statments of cash flows - Cash and due from banks, and restricted cash (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023	Sep. 30, 2023	Dec. 31, 2022
Supplemental Cash Flow Information
Cash and due from banks	$ 418,168		$ 509,538
Restricted cash and due from banks	9,426		25,797
Restricted cash in money market investments	8,072		5,903
Total cash and due from banks, and restricted cash	$ 435,666	$ 427,575	$ 541,238	$ 476,159