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Significant Accounting Policies - Additional Cash Flow Information (Detail) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Accounting Policies [Abstract]    
Cash paid for interest $ 100,041 $ 59,764
Cash paid for income taxes 42,352 5,112
Unsettled purchases/sales of securities 82,064 74,191
Loans foreclosed and transferred to other real estate owned and foreclosed assets 1,302 2,898
Loans to facilitate the sale of other real estate owned 847 0
Right-of-use lease assets obtained in exchange for lessee operating lease liabilities $ 315,542 $ 0