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Derivative Financial Instruments - Additional Information (Detail) (USD $) |  |  | 3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended |  | 3 Months Ended | 9 Months Ended |  | 3 Months Ended
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Sep. 30, 2014 | Dec. 31, 2013 | Sep. 30, 2014 Cash Flow Hedging Interest Rate Swaps | Sep. 30, 2013 Cash Flow Hedging Interest Rate Swaps | Sep. 30, 2014 Cash Flow Hedging Interest Rate Swaps | Sep. 30, 2013 Cash Flow Hedging Interest Rate Swaps | Sep. 30, 2014 Loan Purchase and Forward Sales Commitments | Sep. 30, 2014 Loan Purchase and Forward Sales Commitments | Sep. 30, 2014 Unsecuritized Residential and Commercial Loans | Sep. 30, 2014 Unsecuritized Residential and Commercial Loans | Sep. 30, 2013 Unsecuritized Residential and Commercial Loans | Sep. 30, 2014 Unsecuritized Residential and Commercial Loans Interest Rate Contract | Sep. 30, 2014 Unsecuritized Residential and Commercial Loans Futures | Sep. 30, 2014 Unsecuritized Residential and Commercial Loans TBAs | Sep. 30, 2014 Unsecuritized Residential and Commercial Loans Credit Default Index Swaps | Sep. 30, 2014 Maximum | Sep. 30, 2013 Maximum | Sep. 30, 2014 Maximum | Sep. 30, 2013 Maximum | Sep. 30, 2014 Maximum Interest Rate Swaps | Sep. 30, 2013 Maximum Unsecuritized Residential and Commercial Loans
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional Amount | $ 3,555,452,000 | $ 1,488,922,000 | $ 140,000,000 |  | $ 140,000,000 |  |  |  |  |  |  | $ 635,000,000 | $ 108,000,000 | $ 1,900,000,000 | $ 75,000,000 |  |  |  |  |  |
Valuation adjustments on derivatives |  |  | (3,000,000) | 4,000,000 | (17,000,000) | 25,000,000 | 2,000,000 | 6,000,000 | (4,000,000) | (29,000,000) | 51,000,000 |  |  |  |  |  |  |  |  |  | 1,000,000
Net unrealized losses on interest rate agreements accounted for as cash flow hedges | 33,000,000 | 16,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Hedges decreased in value recorded as a component of interest expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100,000 | 100,000 | 131,000 | 219,000 |  |
Accumulated other comprehensive loss that will be amortized into interest expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (1,000,000) |

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, That Will Be Amortized into Interest Expense + References No definition available. + Details
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- Definition Accumulated change, net of tax, in accumulated gains and losses from derivative instruments designated and qualifying as the effective portion of cash flow hedges. Includes an entity's share of an equity investee's Increase or Decrease in deferred hedging gains or losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e637-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e681-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669686-108580 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669646-108580 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=35736893&loc=d3e80784-113994 + Details
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- Definition Amount of increase (decrease) in the fair value of derivatives recognized in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5618551-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (a),(c),(d),(e) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624171-113959 + Details
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- Definition The effective portion of loss reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624171-113959 + Details
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