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Short-term borrowings (Details 2) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Assets Sold Under Agreements To Repurchase [Line Items] |  |
Total borrowings | $ 289,565 | $ 198,460
Repurchase agreement |  |
Assets Sold Under Agreements To Repurchase [Line Items] |  |
Total borrowings | 74,215 | 78,110
Repurchase agreement | U.S. Treasury and U.S. government sponsored entities |  |
Assets Sold Under Agreements To Repurchase [Line Items] |  |
Total borrowings | 4,811 | 6,555
Repurchase agreement | State and political subdivisions |  |
Assets Sold Under Agreements To Repurchase [Line Items] |  |
Total borrowings | 20,696 | 12,304
Repurchase agreement | Mortgage-backed securities - residential |  |
Assets Sold Under Agreements To Repurchase [Line Items] |  |
Total borrowings | 43,936 | 52,628
Repurchase agreement | Collateralized mortgage obligations |  |
Assets Sold Under Agreements To Repurchase [Line Items] |  |
Total borrowings | $ 4,772 | $ 6,623

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