Deposits - Brokered deposits (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Deposits.
Brokered certificates of deposit	$ 2,796,547	$ 4,465,825
Brokered savings deposits	1,352	589
Brokered deposit on demand accounts		1,504,230
Total brokered deposits	$ 2,797,899	$ 5,970,644