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Borrowings, Short-Term Borrowings (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Borrowings [Abstract] |  |  |
FHLB, unused lines of credit available for short-term financing | $ 3,400,000 | $ 3,100,000 |
Short-term borrowings [Abstract] |  |  |
Balance at year-end | 97,795 | 168,386 |
Federal Funds Purchased [Member] |  |  |
Short-term borrowings [Abstract] |  |  |
Balance at year-end | 0 | 0 | $ 65,000
Average during the year | 17 | 14,727 | 47,137
Maximum month end balance | $ 0 | $ 40,000 | $ 80,000
Weighted average rate during the year | 0.11% | 2.05% | 3.90%
Weighted average rate at year-end | 0.00% | 0.00% | 2.84%
Securities Sold Under Repurchase Agreements [Member] |  |  |
Short-term borrowings [Abstract] |  |  |
Balance at year-end | $ 97,795 | $ 143,386 | $ 143,775
Average during the year | 100,519 | 154,383 | 123,337
Maximum month end balance | $ 135,623 | $ 176,840 | $ 146,410
Weighted average rate during the year | 0.13% | 0.17% | 0.33%
Weighted average rate at year-end | 0.11% | 0.20% | 0.40%
Other Short-Term Borrowings [Member] |  |  |
Short-term borrowings [Abstract] |  |  |
Balance at year-end | $ 0 | $ 25,000 | $ 446,500
Average during the year | 1,302 | 183,699 | 403,453
Maximum month end balance | $ 0 | $ 366,500 | $ 576,000
Weighted average rate during the year | 2.02% | 1.55% | 1.85%
Weighted average rate at year-end | 0.00% | 1.99% | 1.73%

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