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Short-term Borrowings - Summary of Short-Term Borrowings (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Short-term Debt [Line Items] |  |  |
Ending Balance | $ 1,510,825 | $ 1,105,876 | $ 626,615
Average Balance | $ 1,252,531 | $ 815,393 | $ 478,388
Average Rate | 0.40% | 0.30% | 0.26%
Federal funds purchased |  |  |
Short-term Debt [Line Items] |  |  |
Ending Balance | $ 4,000 | $ 9,000 | $ 16,000
Average Balance | $ 14,832 | $ 11,691 | $ 11,982
Average Rate | 0.36% | 0.36% | 0.36%
Borrowings from FHLB |  |  |
Short-term Debt [Line Items] |  |  |
Ending Balance | $ 1,400,000 | $ 945,000 | $ 478,100
Average Balance | $ 1,117,522 | $ 644,651 | $ 335,449
Average Rate | 0.42% | 0.31% | 0.27%
Securities sold under agreements to repurchase |  |  |
Short-term Debt [Line Items] |  |  |
Ending Balance | $ 106,825 | $ 151,876 | $ 132,515
Average Balance | $ 120,177 | $ 159,051 | $ 130,957
Average Rate | 0.23% | 0.24% | 0.25%
Maximum [Member] |  |  |
Short-term Debt [Line Items] |  |  |
Ending Balance | $ 1,510,825 | $ 1,105,876 | $ 626,615
Weighted Average [Member] |  |  |
Short-term Debt [Line Items] |  |  |
Average Rate | 0.53% | 0.30% | 0.27%

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