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Borrowings - Summary of Bancorps Short Term Borrowings (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
FHLB Advances |  |  |
Short-term Debt [Line Items] |  |  |
Maximum outstanding at any month end | $ 2,622,165 | $ 2,283,250 | $ 1,697,800
Average balance during the year | $ 1,526,180 | $ 1,415,755 | $ 965,293
Weighted-average interest rate during the year | 2.05% | 1.44% | 0.95%
Federal Funds Purchased |  |  |
Short-term Debt [Line Items] |  |  |
Maximum outstanding at any month end | $ 195,000 | $ 238,000 | $ 137,000
Average balance during the year | $ 156,652 | $ 163,466 | $ 84,514
Weighted-average interest rate during the year | 1.92% | 1.19% | 0.58%

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