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Short-term borrowings (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Assets Sold Under Agreements To Repurchase [Line Items] |  |
Total repurchase agreements | $ 5,210 | $ 2,521
Repurchase agreement |  |
Assets Sold Under Agreements To Repurchase [Line Items] |  |
Total repurchase agreements | 4,860 | 2,171
Repurchase agreement | U.S. Treasury and U.S. government sponsored entities |  |
Assets Sold Under Agreements To Repurchase [Line Items] |  |
Total repurchase agreements | 148 | 42
Repurchase agreement | State and political subdivisions |  |
Assets Sold Under Agreements To Repurchase [Line Items] |  |
Total repurchase agreements | 2,441 | 1,407
Repurchase agreement | Mortgage-backed securities - residential |  |
Assets Sold Under Agreements To Repurchase [Line Items] |  |
Total repurchase agreements | 2,104 | 568
Repurchase agreement | Collateralized mortgage obligations |  |
Assets Sold Under Agreements To Repurchase [Line Items] |  |
Total repurchase agreements | $ 167 | $ 154

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