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Employee benefit plans - Salaries and Employee Benefits Expense - Profit Sharing (Details) - Retirement Profit Sharing Plan - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Profit Sharing plan      
Company contribution $ 1,245 $ 1,207 $ 1,139
Safe harbor contribution 678 655 627
Discretionary contributions $ 567 $ 552 $ 512