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Borrowings - Other short-term borrowings - (Details) - USD ($) $ in Thousands | 12 Months Ended
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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%

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- Definition For the form of debt having an initial term of less than one year or less than the normal operating cycle, if longer, average borrowings during the period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1402 -Paragraph (a) Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1402 -Paragraph (b) -Subparagraph (1) + Details
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