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Employee benefit plans - Salaries and Employee Benefits Expense - ESOP (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Peoples Security Bank and Trust ESOP      
Peoples Security Bank and Trust ESOP      
Contribution to ESOP $ 0.2 $ 0.3 $ 0.4