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Derivative Financial Instruments - Additional Information (Details) $ in Thousands | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2018 USD ($) counterparty | Mar. 31, 2017 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Derivative [Line Items] |  |  |  |
Notional amount | $ 7,639,175 |  | $ 6,644,081 |
Accumulated other comprehensive income | $ 1,219,983 | $ 1,165,771 | 1,212,287 | $ 1,149,428
Number of counterparties (in counterparties) | counterparty | 2 |  |  |
Net Unrealized Losses on Interest Rate Agreements Accounted for as Cash Flow Hedges |  |  |  |
Derivative [Line Items] |  |  |  |
Accumulated other comprehensive income | $ (34,522) | (42,273) | (42,953) | $ (44,020)
Mortgage Banking Activities, Net |  |  |  |
Derivative [Line Items] |  |  |  |
Market valuations gains and losses, net | 26,238 | 17,397 |  |
Derivative Liabilities |  |  |  |
Derivative [Line Items] |  |  |  |
Notional amount | 2,684,123 |  | 3,485,466 |
Loan purchase commitments | Mortgage Banking Activities, Net |  |  |  |
Derivative [Line Items] |  |  |  |
Market valuations gains and losses, net | (6,968) | 10,265 |  |
Interest rate contract |  |  |  |
Derivative [Line Items] |  |  |  |
Notional amount | 3,320,000 |  | 3,210,000 |
TBAs |  |  |  |
Derivative [Line Items] |  |  |  |
Notional amount | 2,630,000 |  | 1,700,000 |
TBAs | Derivative Liabilities |  |  |  |
Derivative [Line Items] |  |  |  |
Notional amount | 1,110,000 |  | 1,400,000 |
Futures |  |  |  |
Derivative [Line Items] |  |  |  |
Notional amount | 15,000 |  | 8,000 |
Futures | Derivative Liabilities |  |  |  |
Derivative [Line Items] |  |  |  |
Notional amount | 15,000 |  | 0 |
Unsecuritized Residential and Commercial Loans |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative gain (loss) | 67,000 | (7,000) |  |
Interest rate swaps | Cash Flow Hedging |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative gain (loss) | 8,000 | $ 2,000 |  |
Interest rate swaps | Derivative Liabilities |  |  |  |
Derivative [Line Items] |  |  |  |
Notional amount | 451,500 |  | 1,248,000 |
Interest rate swaps | 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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