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Short-Term Borrowings (Short-Term Borrowings) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Short-term Debt [Line Items] |  |
Amount outstanding at period end | $ 1,667,513 | $ 2,714,872
Federal Funds Purchased [Member] |  |
Short-term Debt [Line Items] |  |
Amount outstanding at period end | 300 | 195,450
Average amount outstanding during period | 9,708 | 49,297
Maximum amount at any month end during period | $ 330,330 | $ 202,933
Weighted-average interest at period end | 0.15% | 1.60%
Weighted-average interest rate during period | 1.15% | 2.30%
Securities Sold Under Agreements to Repurchase [Member] |  |
Short-term Debt [Line Items] |  |
Amount outstanding at period end | $ 567,213 | $ 484,422
Average amount outstanding during period | 600,167 | 493,344
Maximum amount at any month end during period | $ 806,645 | $ 518,042
Weighted-average interest at period end | 0.14% | 0.54%
Weighted-average interest rate during period | 0.24% | 0.52%
FHLB Borrowings [Member] |  |
Short-term Debt [Line Items] |  |
Amount outstanding at period end | $ 1,100,000 | $ 2,035,000
Average amount outstanding during period | 1,368,320 | 1,399,503
Maximum amount at any month end during period | $ 2,110,000 | $ 1,941,774
Weighted-average interest at period end | 0.49% | 1.17%
Weighted-average interest rate during period | 0.62% | 1.96%

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