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Borrowings, Short-term Debt (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017
Short-term Debt [Abstract] |  |
Repurchase agreements | $ 232,712 | $ 243,814
Federal funds purchased | 1,180 | 7,312
Total short-term debt | $ 233,892 | $ 251,126
Federal Funds Purchased [Member] |  |
Short-term Debt [Abstract] |  |
Average interest rate | 2.18% |
Repurchase Agreements [Member] |  |
Short-term Debt [Abstract] |  |
Average interest rate | 2.01% |
Maximum balance for repurchase agreements at any month-end | $ 253,200 |
Average balance of repurchase agreements | $ 239,900 |

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