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Short-term borrowings (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Assets Sold Under Agreements To Repurchase [Line Items] |  |
Total repurchase agreements | $ 31,001 | $ 244,759
Repurchase agreement |  |
Assets Sold Under Agreements To Repurchase [Line Items] |  |
Total repurchase agreements | 4,899 | 4,409
Repurchase agreement | U.S. Treasury and U.S. government sponsored entities |  |
Assets Sold Under Agreements To Repurchase [Line Items] |  |
Total repurchase agreements | 220 | 332
Repurchase agreement | State and political subdivisions |  |
Assets Sold Under Agreements To Repurchase [Line Items] |  |
Total repurchase agreements | 1,758 | 664
Repurchase agreement | Mortgage-backed securities - residential |  |
Assets Sold Under Agreements To Repurchase [Line Items] |  |
Total repurchase agreements | 2,577 | 3,094
Repurchase agreement | Collateralized mortgage obligations |  |
Assets Sold Under Agreements To Repurchase [Line Items] |  |
Total repurchase agreements | $ 344 | $ 319

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