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Fair Value Measurements - Notional Amounts and Fair Values of Derivatives by Product (Details) - USD ($) $ in Thousands | Sep. 30, 2015 | Dec. 31, 2014
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |
Derivatives asset, Notional | $ 323,207 | $ 440,884
Derivatives asset, Fair Value | 11,152 | 12,111
Derivative liability, notional | 2,867,046 | 5,011,304
Derivative liability, Fair Value | 8,700 | 3,505
Other Contracts [Member] | Interest Rate Lock Commitments [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivatives asset, Notional | 265,717 | 147,521
Derivatives asset, Fair Value | 10,808 | 7,576
Derivative liability, notional | 4,714 | 22,269
Derivative liability, Fair Value | 187 | 1,222
Other Contracts [Member] | Foreign Exchange Forward [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative liability, notional | 600 | 400,000
Other Contracts [Member] | To Be Announced Security [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivatives asset, Notional | 57,490 | 105,185
Derivatives asset, Fair Value | 344 | 1,026
Derivative liability, notional | 54,140 | 105,186
Derivative liability, Fair Value | 321 | 1,018
Other Contracts [Member] | Forward Start Repurchase Agreement [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative liability, notional |  | 636,000
Derivative liability, Fair Value |  | 0
Other Contracts [Member] | Tba Sale Agreements [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivatives asset, Notional |  | 188,178
Derivatives asset, Fair Value |  | 3,509
Derivative liability, notional | 301,991 |
Derivative liability, Fair Value | 6,840 |
Other Contracts [Member] | Foreign Exchange Forward [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative liability, Fair Value | 5 | 10
Other Contracts [Member] | Auction Rate Securities Purchase Commitment [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative liability, notional | 9,601 | 12,249
Derivative liability, Fair Value | 477 | 902
Commodity Contracts [Member] | Future [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative liability, notional | 2,496,000 | 3,835,600
Derivative liability, Fair Value | $ 870 | $ 353

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