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Borrowings - Other short-term borrowings - (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Short-term debt    
Maximum aggregate balance outstanding at any month-end $ 100,000 $ 160,000
Average monthly aggregate balance outstanding $ 21,557 $ 8,703
Weighted average interest rate for the year 0.56% 2.50%
Weighted average interest rate at December 31 0.73% 1.85%