Significant Unobservable Inputs used in Fair Value Measurement (Detail) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2013		Dec. 31, 2012	Jun. 30, 2012	Dec. 31, 2011
Capital trust notes
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair value	$ 19,893
Valuation Technique	Discounted Cash Flow
Weighted Average Discount Rate	5.01%	[1]
Mortgage servicing rights
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair value	214,959		144,520	136,176	116,416
Valuation Technique	Discounted Cash Flow
Weighted Average Constant Prepayment Rate	9.60%	[2]
Weighted Average Discount Rate	10.50%
Interest rate lock commitments
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair value	$ (6,653)		$ 21,446	$ 29,597	$ 15,633
Valuation Technique	Pricing Model
Weighted Average Closing Ratio	88.04%

[1] Derived from multiple interest rate scenarios that incorporate a spread to the London Interbank Offered Rate swap curve and market volatility.

[2] Represents annualized loan repayment rate assumptions.