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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, 2019
Dec. 31, 2018
Dec. 31, 2017
Profit Sharing plan      
Company contribution $ 1,047 $ 1,047 $ 923
Safe harbor contribution 627 578 509
Discretionary contributions $ 512 $ 469 $ 414