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Derivative Financial Instruments - Additional Information (Details) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 USD ($) counterparty | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($)
Derivative [Line Items] |  |  |  |
Notional Amount | $ 6,644,081 | $ 4,980,343 |  |
Net unrealized gain (loss) on interest rate agreements | 1,022 | 3,271 | $ (1,409) |
Stockholders' equity attributable to parent | $ 1,212,287 | 1,149,428 | 1,146,265 | $ 1,265,869
Number of counterparties | counterparty | 3 |  |  |
Net Unrealized Losses on Interest Rate Agreements Accounted for as Cash Flow Hedges |  |  |  |
Derivative [Line Items] |  |  |  |
Stockholders' equity attributable to parent | $ (42,953) | (44,020) | (47,363) |
Derivative Liabilities |  |  |  |
Derivative [Line Items] |  |  |  |
Notional Amount | 3,485,466 | 2,423,362 |  |
Mortgage Banking Activities, Net |  |  |  |
Derivative [Line Items] |  |  |  |
Changes in fair value of assets | 51,844 | 36,445 | 6,482 |
Loan purchase commitments | Mortgage Banking Activities, Net |  |  |  |
Derivative [Line Items] |  |  |  |
Changes in fair value of assets | 37,880 | 25,613 | 50,234 |
Interest Rate Contract |  |  |  |
Derivative [Line Items] |  |  |  |
Notional Amount | 3,210,000 | 2,460,000 |  |
TBAs |  |  |  |
Derivative [Line Items] |  |  |  |
Notional Amount | 1,700,000 | 1,360,000 |  |
TBAs | Derivative Liabilities |  |  |  |
Derivative [Line Items] |  |  |  |
Notional Amount | 1,400,000 | 510,000 |  |
Futures |  |  |  |
Derivative [Line Items] |  |  |  |
Notional Amount | 8,000 | 88,000 |  |
Futures | Derivative Liabilities |  |  |  |
Derivative [Line Items] |  |  |  |
Notional Amount | 0 | 87,500 |  |
Residential and Commercial Loans |  |  |  |
Derivative [Line Items] |  |  |  |
Valuation adjustments on derivatives | (31,000) | 10,000 | $ (65,000) |
Interest rate agreements | Cash Flow Hedging |  |  |  |
Derivative [Line Items] |  |  |  |
Net unrealized gain (loss) on interest rate agreements | 1,000 | 3,000 |  |
Interest rate agreements | Derivative Liabilities |  |  |  |
Derivative [Line Items] |  |  |  |
Notional Amount | 1,248,000 | 1,101,500 |  |
Interest rate agreements | Derivative Liabilities | Cash Flow Hedging |  |  |  |
Derivative [Line Items] |  |  |  |
Notional Amount | $ 139,500 | $ 139,500 |  |

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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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