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Short-term borrowings (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Assets Sold Under Agreements To Repurchase [Line Items] |  |
Total repurchase agreements | $ 19,998 | $ 77,050
Repurchase agreement |  |
Assets Sold Under Agreements To Repurchase [Line Items] |  |
Total repurchase agreements | 4,648 | 1,700
Repurchase agreement | U.S. Treasury and U.S. government sponsored entities |  |
Assets Sold Under Agreements To Repurchase [Line Items] |  |
Total repurchase agreements | 119 | 55
Repurchase agreement | State and political subdivisions |  |
Assets Sold Under Agreements To Repurchase [Line Items] |  |
Total repurchase agreements | 2,060 | 627
Repurchase agreement | Mortgage-backed securities - residential |  |
Assets Sold Under Agreements To Repurchase [Line Items] |  |
Total repurchase agreements | 1,974 | 948
Repurchase agreement | Collateralized mortgage obligations |  |
Assets Sold Under Agreements To Repurchase [Line Items] |  |
Total repurchase agreements | $ 495 | $ 70

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