Deposits - Brokered deposits (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Deposits
Brokered certificates of deposit	$ 3,679,084	$ 2,681,198
Brokered savings deposits	51,076	81,532
Brokered deposit on demand accounts		13
Total brokered deposits	$ 3,730,160	$ 2,762,743