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Premises and Equipment (Narrative) (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Property, Plant and Equipment [Abstract]      
Depreciation and amortization of premises and equipment, year to date $ 36,300 $ 36,000 $ 28,500
Gain on sale and lease-back of property plant equipment   10,300  
Net deferred gain on sale of property 4,200    
Gross deferred gain on sale of property 0 $ 7,099 $ 0
Current period amortization of deferred gain $ 2,900