Changes in MSRs measured using the fair value method (Detail) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2014		Sep. 30, 2013
Servicing Assets at Fair Value [Line Items]
Fair value at beginning of period	$ 161,099		$ 154,430
Purchases	0		45
Servicing Asset At Fair Value Securitizations Or Asset Transfers	9,611		15,062
Servicing Asset At Fair Value Payments On Loans	(12,670)	[1]	(17,351)	[1]
Reduction Due To Loan Repurchases	(2,440)		(2,866)
Servicing Asset At Fair Value Changes In Fair Value Resulting From Changes In Valuation Inputs Or Changes In Assumptions	(3,314)		13,355
Servicing Asset At Fair Value Other Changes That Affect Balance	(4)		(1,230)
Fair value at end of period	$ 152,282		$ 161,445

[1] Represents changes due to collection / realization of expected cash flows over time.