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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% |

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