Activity for Residential First-Lien Mortgage Servicing Rights (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2014		Jun. 30, 2013		Jun. 30, 2014		Jun. 30, 2013
Servicing Assets at Fair Value [Line Items]
Balance at beginning of period					$ 64,824
Additions					11,976		28,614
Balance at End of Period	71,225				71,225
Mortgage Servicing Rights
Servicing Assets at Fair Value [Line Items]
Balance at beginning of period	64,971		18,123		64,824		5,315
Additions	11,807		16,148		14,666		28,614
Changes in assumptions	(3,553)	[1]	9,506	[1]	(4,678)	[1]	10,312	[1]
Other changes	(2,000)	[2]	(679)	[2]	(3,587)	[2]	(1,143)	[2]
Balance at End of Period	$ 71,225		$ 43,098		$ 71,225		$ 43,098

[1] Primarily reflects changes in prepayment assumptions due to changes in interest rates and discount rates.

[2] Represents changes due to realization of expected cash flows.