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Borrowings - Long-term debt advances (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Debt Instrument    
Long-term debt $ 3,752 $ 14,769
Long-term 1.99% fixed rate debt due June 2021    
Debt Instrument    
Long-term debt   10,000
Fixed interest rate (as a percent) 1.99%  
Long-term 4.69% fixed rate debt due March 2023    
Debt Instrument    
Long-term debt $ 3,752 $ 4,769
Fixed interest rate (as a percent) 4.69%