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Short-term Borrowings - Summary of Short-Term Borrowings (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Federal Funds Purchased |  |  |
Short-term Debt [Line Items] |  |  |
Average balance | $ 405,110 | $ 447,137 | $ 589,223
Year-end balance | 256,567 | 399,820 | 414,207
Maximum month-end outstanding | $ 503,138 | $ 568,490 | $ 695,083
Average rate for the year | 1.89% | 1.06% | 0.52%
Average rate at year-end | 2.50% | 1.48% | 0.73%
Securities Sold Under Agreements to Repurchase |  |  |
Short-term Debt [Line Items] |  |  |
Average balance | $ 713,841 | $ 578,666 | $ 425,452
Year-end balance | 762,592 | 656,602 | 453,053
Maximum month-end outstanding | $ 891,425 | $ 743,684 | $ 528,024
Average rate for the year | 1.40% | 0.72% | 0.08%
Average rate at year-end | 1.66% | 0.64% | 0.08%
Trading Liabilities |  |  |
Short-term Debt [Line Items] |  |  |
Average balance | $ 682,943 | $ 685,891 | $ 771,039
Year-end balance | 335,380 | 638,515 | 561,848
Maximum month-end outstanding | $ 890,717 | $ 896,943 | $ 874,076
Average rate for the year | 2.83% | 2.26% | 1.95%
Average rate at year-end | 3.21% | 2.22% | 2.46%
Other Short-term Borrowings |  |  |
Short-term Debt [Line Items] |  |  |
Average balance | $ 1,046,585 | $ 554,502 | $ 198,440
Year-end balance | 114,764 | 2,626,213 | 83,177
Maximum month-end outstanding | $ 2,229,155 | $ 2,626,213 | $ 792,736
Average rate for the year | 1.82% | 1.28% | 0.67%
Average rate at year-end | 2.48% | 1.44% | 0.96%

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