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Borrowings - Other short-term borrowings - (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Short-term debt    
Maximum aggregate balance outstanding at any month-end $ 75,000 $ 100,000
Average monthly aggregate balance outstanding $ 343 $ 21,557
Weighted average interest rate for the year 0.35% 0.56%
Weighted average interest rate at December 31 0.35% 0.73%