Changes in Fair Value of Loans Held for Sale (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Fair Value, Option, Quantitative Disclosures [Line Items]
Mortgage Banking Income	$ 5,439	[1]	$ 14,339	[1]	$ 11,372	[1]
Loans held for sale
Fair Value, Option, Quantitative Disclosures [Line Items]
Mortgage Banking Income	(10,260)	[1]	102,642	[1]	83,202	[1]
Mortgage servicing rights
Fair Value, Option, Quantitative Disclosures [Line Items]
Mortgage Banking Income	$ 15,699	[1]	$ (88,303)	[1]	$ (71,830)	[1]

[1] Does not include the effect of hedging activities.