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Employee benefit plans - Salaries and Employee Benefits Expense - Profit Sharing (Details) - Retirement Profit Sharing Plan - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Profit Sharing plan      
Company contribution $ 1.3 $ 1.2 $ 1.2
Safe harbor contribution 0.7 0.7 0.7
Discretionary contributions $ 0.6 $ 0.6 $ 0.6