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Short-term Borrowings - Summary of Short-Term Borrowings (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Short-term Debt [Line Items] |  |  |
Ending Balance | $ 867,943 | $ 1,510,825 | $ 1,105,876
Average Balance | $ 1,387,737 | $ 1,252,531 | $ 815,393
Average Rate | 0.58% | 0.40% | 0.30%
Federal funds purchased |  |  |
Short-term Debt [Line Items] |  |  |
Ending Balance | $ 0 | $ 4,000 | $ 9,000
Average Balance | $ 6,887 | $ 14,832 | $ 11,691
Average Rate | 0.60% | 0.36% | 0.36%
Borrowings from FHLB |  |  |
Short-term Debt [Line Items] |  |  |
Ending Balance | $ 748,000 | $ 1,400,000 | $ 945,000
Average Balance | $ 1,265,932 | $ 1,117,522 | $ 644,651
Average Rate | 0.61% | 0.42% | 0.31%
Securities sold under agreements to repurchase |  |  |
Short-term Debt [Line Items] |  |  |
Ending Balance | $ 119,943 | $ 106,825 | $ 151,876
Average Balance | $ 114,918 | $ 120,177 | $ 159,051
Average Rate | 0.23% | 0.23% | 0.24%
Maximum [Member] |  |  |
Short-term Debt [Line Items] |  |  |
Ending Balance | $ 1,530,678 | $ 1,510,825 | $ 1,105,876
Weighted Average [Member] |  |  |
Short-term Debt [Line Items] |  |  |
Average Rate | 0.63% | 0.53% | 0.30%

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