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Changes in Fair Value of Loans Held for Sale (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
 [2]
Jun. 30, 2017
Jun. 30, 2016
 [2]
Fair Value, Option, Quantitative Disclosures [Line Items]        
Mortgage Banking Income [1] $ (6,963) $ (30,055) $ (9,753) $ (64,279)
Loans held for sale        
Fair Value, Option, Quantitative Disclosures [Line Items]        
Mortgage Banking Income [1] 658 933 595 3,802
Mortgage servicing rights | Covered loans held for sale        
Fair Value, Option, Quantitative Disclosures [Line Items]        
Mortgage Banking Income [1] $ (7,621) $ (30,988) $ (10,348) $ (68,081)
[1] Does not include the effect of economic hedging activities, which is included in "Other non-interest income."
[2] The presentation of the amounts for the three and six months ended June 30, 2016 has been modified to conform to the presentation for the three and six months ended June 30, 2017.