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Borrowings - Summary of Bancorp's Short-term Borrowings (Detail) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2023 | Dec. 31, 2022
Federal Reserve Bank Advances |  |
Short-term Debt [Line Items] |  |
Maximum outstanding at any month end | $ 0 | $ 0
Average balance during the period | $ 160,571 | $ 0
Weighted-average interest rate during the period | 5.23% | 0.00%
FHLB advances |  |
Short-term Debt [Line Items] |  |
Maximum outstanding at any month end | $ 0 | $ 775,000
Average balance during the period | $ 116,862 | $ 144,918
Weighted-average interest rate during the period | 5.16% | 1.07%
Federal Funds Purchased |  |
Short-term Debt [Line Items] |  |
Maximum outstanding at any month end | $ 0 | $ 895,000
Average balance during the period | $ 5,055 | $ 349,581
Weighted-average interest rate during the period | 4.97% | 1.66%

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