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Short-Term Borrowings (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Short-term borrowings [Abstract] |  |  |
Balance at year-end | $ 655,275 | $ 871,696 |
FHLB, unused lines of credit available for short-term financing | 2,400,000 | 1,900,000 |
Federal Funds Purchased [Member] |  |  |
Short-term borrowings [Abstract] |  |  |
Balance at year-end | 65,000 | 80,000 | $ 60,000
Average during the year | 47,137 | 66,839 | 54,162
Maximum month end balance | $ 80,000 | $ 80,000 | $ 80,000
Weighted average rate during the year | 3.90% | 3.43% | 2.16%
Weighted average rate at year-end | 2.84% | 4.25% | 2.41%
Securities Sold Under Repurchase Agreements [Member] |  |  |
Short-term borrowings [Abstract] |  |  |
Balance at year-end | $ 143,775 | $ 160,696 | $ 182,123
Average during the year | 123,337 | 146,135 | 175,539
Maximum month end balance | $ 146,410 | $ 170,350 | $ 190,326
Weighted average rate during the year | 0.33% | 0.16% | 0.07%
Weighted average rate at year-end | 0.40% | 0.38% | 0.07%
Other Short-Term Borrowings [Member] |  |  |
Short-term borrowings [Abstract] |  |  |
Balance at year-end | $ 446,500 | $ 631,000 | $ 477,000
Average during the year | 403,453 | 514,662 | 460,334
Maximum month end balance | $ 576,000 | $ 653,000 | $ 591,000
Weighted average rate during the year | 1.85% | 1.56% | 1.02%
Weighted average rate at year-end | 1.73% | 1.82% | 1.18%

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