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Borrowings - Long-term debt advances (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Debt Instrument    
Long-term debt $ 32,250 $ 32,733
Long-term 1.74% fixed rate debt due June 2020    
Debt Instrument    
Long-term debt $ 5,000 5,000
Fixed interest rate (as a percent) 1.74%  
Long-term 2.22% fixed rate debt due June 2020    
Debt Instrument    
Long-term debt $ 6,000 6,000
Fixed interest rate (as a percent) 2.22%  
Long-term 1.84% fixed rate debt due December 2020    
Debt Instrument    
Long-term debt $ 5,000 5,000
Fixed interest rate (as a percent) 1.84%  
Long-term 1.99% fixed rate debt due June 2021    
Debt Instrument    
Long-term debt $ 10,000 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 $ 6,250 $ 6,733
Fixed interest rate (as a percent) 4.69%