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Summary of Significant Accounting Policies (Additional Cash Flow Information) (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Accounting Policies [Abstract]      
Cash paid for interest $ 89,270 $ 24,371 $ 11,886
Cash paid for income tax 5,112 56,359 50,427
Deferred gain on sale of building and parking garage 0 0 7,099
Unsettled purchases/sales of securities 330 37,481 0
Loans foreclosed and transferred to other real estate owned and foreclosed assets 2,899 279 0
Loans to facilitate the sale of other real estate owned $ 0 $ 0 $ 753