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Borrowings - Summary of Bancorps Short Term Borrowings (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
FHLB Advances |  |  |
Short-term Debt [Line Items] |  |  |
Maximum outstanding at any month end | $ 910,000 | $ 1,190,150 | $ 2,622,165
Average balance during the year | $ 809,788 | $ 793,304 | $ 1,526,180
Weighted-average interest rate during the year | 2.31% | 2.66% | 2.05%
Federal Funds Purchased |  |  |
Short-term Debt [Line Items] |  |  |
Maximum outstanding at any month end | $ 842,000 | $ 600,000 | $ 195,000
Average balance during the year | $ 239,481 | $ 271,400 | $ 156,652
Weighted-average interest rate during the year | 0.19% | 2.28% | 1.92%

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