Employee Benefits - Retirement plan contribution (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Employee Benefits
Retirement plan contributions	$ 4,537	$ 5,080	$ 5,137
Total ESOP shares outstanding	1,152,017	1,111,424	1,207,952
Salary Reduction Plan
Employee Benefits
Retirement plan contributions	$ 2,933	$ 3,148	$ 3,123
ESOP
Employee Benefits
Retirement plan contributions	$ 1,604	$ 1,932	$ 2,014