Borrowings - Other short-term borrowings - (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Short-term Debt [Line Items]
Maximum aggregate balance outstanding at any month-end	$ 65,000	$ 375,000
Average monthly aggregate balance outstanding	$ 27,302	$ 99,083
Weighted average interest rate for the year	4.80%	3.46%
Weighted average interest rate at December 31	5.60%	4.47%