Deposits - Brokered deposits (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Deposits
Brokered certificates of deposit	$ 4,619,798	$ 2,681,198
Brokered savings deposits	6,243	81,532
Brokered deposit on demand accounts	125,108	13
Total brokered deposits	$ 4,751,149	$ 2,762,743