Fair Value - Components of Net Gains on Sales of Loans (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended	6 Months Ended	12 Months Ended
Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Components of Net Gains on Sales of Loans (Detail) [Line Items]
Realized gains on sales of loans	$ 102,517	$ 67,218	$ 189,350	$ 75,526	$ 218,504	$ 537
Change in unrealized gains (losses) on loans held for sale	23,353	(15,897)	19,177	(2,271)	24,771	266
Net fair value gains (losses) on derivatives					144,357	(153)
Capitalized servicing rights	45,554	36,305	98,167	37,595	187,749
Provision for repurchases	(1,838)us-gaap_ProvisionForOtherLosses	(2,010)us-gaap_ProvisionForOtherLosses	(4,024)us-gaap_ProvisionForOtherLosses	(2,181)us-gaap_ProvisionForOtherLosses	(9,067)us-gaap_ProvisionForOtherLosses	(18)us-gaap_ProvisionForOtherLosses
Interest income	8,721	8,473	17,066	9,261	32,625	16
Other		114	0	34	35
Net gains on sales of loans	144,611us-gaap_GainLossOnSaleOfMortgageLoans	235,949us-gaap_GainLossOnSaleOfMortgageLoans	248,645us-gaap_GainLossOnSaleOfMortgageLoans	314,394us-gaap_GainLossOnSaleOfMortgageLoans	598,974us-gaap_GainLossOnSaleOfMortgageLoans	648us-gaap_GainLossOnSaleOfMortgageLoans	0us-gaap_GainLossOnSaleOfMortgageLoans
Interest Rate Lock Commitments [Member]
Components of Net Gains on Sales of Loans (Detail) [Line Items]
Net fair value gains (losses) on derivatives	37,969	(17,217)	36,363	41,404	38,126	949
Forward Sales Commitments [Member]
Components of Net Gains on Sales of Loans (Detail) [Line Items]
Net fair value gains (losses) on derivatives	(63,956)	183,625	(99,812)	179,688	111,830	(1,102)
Loan Purchase Commitments [Member]
Components of Net Gains on Sales of Loans (Detail) [Line Items]
Net fair value gains (losses) on derivatives	$ (7,709)	$ (24,662)	$ (7,642)	$ (24,662)	$ (5,599)

Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments.

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The gains (losses) included in earnings that represent the difference between the sale price and the carrying value of loans made to finance real estate acquisitions. This element refers to the gain (loss) and not to the cash proceeds of the sale. This element is a noncash adjustment to net income when calculating net cash generated by operating activities using the indirect method.

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The increase (decrease) during the reporting period in the value of mortgage loans that are held with the intention to sell or be securitized in the near future.

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The amount of interest and fee income earned from loans held-for-sale, including mortgage loans, and interest earned from direct financing and sales-type leases held-for-sale.

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Amount of expense related to other loss.

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Reflects, by transferred financial asset type, the amount of sales proceeds in excess of or deficient from the sum of the carrying amounts of transferred financial assets plus transaction costs, including those transactions in which the seller/transferor has continuing involvement with the financial assets that have been transferred.

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Gain associated with capitalized servicing rights.

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Other changes in mortgage loans held for sale.

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