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Changes in Fair Value of Loans Held for Sale (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
 [2]
Fair Value, Option, Quantitative Disclosures [Line Items]    
Mortgage Banking Income [1] $ (2,789) $ (34,224)
Loans held for sale    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Mortgage Banking Income [1] (63) 2,869
Mortgage servicing rights    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Mortgage Banking Income [1] $ (2,726) $ (37,093)
[1] Does not include the effect of hedging activities, which is included in "Other non-interest income."
[2] The presentation of the amounts for the three months ended March 31, 2016 has been modified to conform to the presentation for the three months ended March 31, 2017.