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Summary of Significant Accounting Policies (Additional Cash Flow Information) (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Accounting Policies [Abstract] |  |  |
Cash paid for interest | $ 49,300 | $ 124,781 | $ 89,270
Cash paid for income tax | 44,140 | 45,352 | 5,112
Transfer of securities from available for sale to held to maturity | 0 | 377,812 | 0
Unsettled securities transactions | 57,783 | 0 | 330
Loans foreclosed and transferred to other real estate owned and foreclosed assets | 140 | 1,348 | 2,899
Loans to facilitate the sale of other real estate owned | 0 | 847 | 0
Right-of-use lease assets obtained in exchange for lessee operating lease liabilities | 18,284 | 319,286 | 0
Treasury stock issued to 401(k) stock purchase plan | $ 10,307 | $ 0 | $ 0

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