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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, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Short-term Debt [Line Items] |  |  |
Ending Balance | $ 707,466 | $ 867,943 | $ 1,510,825
Average Balance | $ 867,391 | $ 1,387,737 | $ 1,252,531
Average Rate | 1.01% | 0.58% | 0.40%
Federal funds purchased |  |  |
Short-term Debt [Line Items] |  |  |
Ending Balance | $ 0 | $ 0 | $ 4,000
Average Balance | $ 6,225 | $ 6,887 | $ 14,832
Average Rate | 1.24% | 0.60% | 0.36%
Borrowings from FHLB |  |  |
Short-term Debt [Line Items] |  |  |
Ending Balance | $ 567,500 | $ 748,000 | $ 1,400,000
Average Balance | $ 710,932 | $ 1,265,932 | $ 1,117,522
Average Rate | 1.18% | 0.61% | 0.42%
Securities sold under agreements to repurchase |  |  |
Short-term Debt [Line Items] |  |  |
Ending Balance | $ 139,966 | $ 119,943 | $ 106,825
Average Balance | $ 150,234 | $ 114,918 | $ 120,177
Average Rate | 0.24% | 0.23% | 0.23%
Maximum [Member] |  |  |
Short-term Debt [Line Items] |  |  |
Ending Balance | $ 967,259 | $ 1,530,678 | $ 1,510,825
Weighted Average [Member] |  |  |
Short-term Debt [Line Items] |  |  |
Average Rate | 1.27% | 0.63% | 0.53%

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