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Basis of Presentation and Significant Accounting Policies - Summary of Supplemental Cash Flow Information (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Cash payments:      
Interest $ 70,043 $ 127,713 $ 91,813
Income taxes (net of refunds) 24,436 5,494 (2,505)
Noncash Investing and Financing Activities:      
Securities transferred from held-to-maturity to available-for-sale 0 381,992 447,026
Securities transferred from available-for-sale to held-to-maturity 0 0 323,990
Transfer of premises and equipment to assets held for sale 16,661 2,689 9,634
Operating lease right-of-use assets obtained in exchange for lease obligations (116)    
Operating lease right-of-use assets obtained in exchange for lease obligations   113,498 0
Finance lease right-of-use assets obtained in exchange for lease obligations $ 5,225 $ 7,871 $ 0