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Borrowings - Summary of Bancorps Short Term Borrowings (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
FHLB Advances |  |  |
Short-term Debt [Line Items] |  |  |
Maximum outstanding at any month end | $ 2,283,250 | $ 1,697,800 | $ 1,365,300
Average balance during the year | $ 1,415,755 | $ 965,293 | $ 844,835
Weighted-average interest rate during the year | 1.44% | 0.95% | 0.60%
Federal Funds Purchased |  |  |
Short-term Debt [Line Items] |  |  |
Maximum outstanding at any month end | $ 238,000 | $ 137,000 | $ 85,000
Average balance during the year | $ 163,466 | $ 84,514 | $ 41,397
Weighted-average interest rate during the year | 1.19% | 0.58% | 0.35%

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