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Deposits - Summary of interest expense on deposits (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Deposits.      
Checking and savings accounts $ 28,579 $ 5,968 $ 4,023
Certificate accounts 29,796 8,788 8,150
Brokered deposits 30,719 6,162 989
Early withdrawal penalties (337) (242) (60)
Total interest expense on deposits $ 88,757 $ 20,676 $ 13,102