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Short-term borrowings (Details) - Repurchase agreement - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Assets Sold Under Agreements To Repurchase [Line Items] |  |
Total repurchase agreements | $ 85,738 | $ 78,110
U.S. Treasury and U.S. government sponsored entities |  |
Assets Sold Under Agreements To Repurchase [Line Items] |  |
Total repurchase agreements | 5,367 | 6,555
State and political subdivisions |  |
Assets Sold Under Agreements To Repurchase [Line Items] |  |
Total repurchase agreements | 25,172 | 12,304
Mortgage-backed securities - residential |  |
Assets Sold Under Agreements To Repurchase [Line Items] |  |
Total repurchase agreements | 49,864 | 52,628
Collateralized mortgage obligations - residential |  |
Assets Sold Under Agreements To Repurchase [Line Items] |  |
Total repurchase agreements | $ 5,335 | $ 6,623

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