Intangible Assets - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Finite-Lived Intangible Assets And Liabilities [Line Items]
Goodwill	$ 2,436,131	$ 2,436,131
Amortization of core deposit intangibles	15,784	19,644	26,066
Mortgaged servicing rights	241,018	144,713
Core deposit intangibles
Finite-Lived Intangible Assets And Liabilities [Line Items]
Amortization of core deposit intangibles	$ 16,240
Core deposit intangibles | Maximum
Finite-Lived Intangible Assets And Liabilities [Line Items]
Amortization period for core deposit intangibles (in years)	10 years