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Summary of Significant Accounting Policies (Additional Cash Flow Information) (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Accounting Policies [Abstract] |  |  |
Cash paid for interest | $ 124,781 | $ 89,270 | $ 24,371
Cash paid for income tax | 45,352 | 5,112 | 56,359
Transfer of investment securities to held to maturity from available for sale | 377,812 | 0 | 0
Unsettled purchases/sales of securities | 0 | 330 | 37,481
Loans foreclosed and transferred to other real estate owned and foreclosed assets | 1,348 | 2,899 | 279
Loans to facilitate the sale of other real estate owned | 847 | 0 | 0
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability | $ 319,286 | $ 0 | $ 0

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