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Borrowings - Summary of Bancorps Short Term Borrowings (Detail) - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2021 | Dec. 31, 2020
FHLB Advances |  |
Short-term Debt [Line Items] |  |
Maximum outstanding at any month end | $ 850,000 | $ 910,000
Average balance during the period | $ 500,273 | $ 809,788
Weighted-average interest rate during the period | 2.48% | 2.31%
Federal Funds Purchased |  |
Short-term Debt [Line Items] |  |
Maximum outstanding at any month end | $ 365,000 | $ 842,000
Average balance during the period | $ 44,171 | $ 239,481
Weighted-average interest rate during the period | 0.07% | 0.19%

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