Deposits - Brokered deposits (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Deposits
Brokered certificates of deposit	$ 551,809	$ 29,164
Brokered savings deposits	357,840	324,408
Brokered deposit on demand accounts	1,250,141	820,165
Total brokered deposits	$ 2,159,790	$ 1,173,737