Significant Unobservable Inputs used in Fair Value Measurement (Detail) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2014		Dec. 31, 2013	Jun. 30, 2013	Dec. 31, 2012
Mortgage servicing rights
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair value	$ 228,815		$ 241,018	$ 214,959	$ 144,520
Valuation Technique	Discounted Cash Flow
Weighted Average Constant Prepayment Rate	8.70%	[1]
Weighted Average Discount Rate	10.00%
Interest rate lock commitments
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair value	$ 3,892		$ 258	$ (6,653)	$ 21,446
Valuation Technique	Pricing Model
Weighted Average Closing Ratio	74.31%

[1] Represents annualized loan repayment rate assumptions.