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Borrowings, Short-term Debt (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019
Short-term Debt [Abstract] |  |
Repurchase agreements | $ 355,862 | $ 226,917
Federal funds purchased | 500 | 7,906
Total short-term debt | $ 356,362 | $ 234,823
Federal Funds Purchased [Member] |  |
Short-term Debt [Abstract] |  |
Average interest rate | 0.00% |
Repurchase Agreements [Member] |  |
Short-term Debt [Abstract] |  |
Average interest rate | 0.34% |
Maximum balance for repurchase agreements at any month-end | $ 373,400 |
Average balance of repurchase agreements | $ 290,500 |

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