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Derivative Financial Instruments - Additional Information (Details) $ in Thousands | 3 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2017 USD ($) counterparty | Sep. 30, 2016 USD ($) | Sep. 30, 2017 USD ($) counterparty | Sep. 30, 2016 USD ($) | Jun. 30, 2017 USD ($) | Dec. 31, 2016 USD ($) | Jun. 30, 2016 USD ($) | Dec. 31, 2015 USD ($)
Derivative [Line Items] |  |  |  |  |  |  |  |
Notional amount | $ 6,244,759 |  | $ 6,244,759 |  |  | $ 4,980,343 |  |
Accumulated other comprehensive income | $ 1,208,640 | $ 1,130,130 | $ 1,208,640 | $ 1,130,130 |  | 1,149,428 |  | $ 1,146,265
Number of counterparties (in counterparties) | counterparty | 3 |  | 3 |  |  |  |  |
Net Unrealized Losses on Interest Rate Agreements Accounted for as Cash Flow Hedges |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Accumulated other comprehensive income | $ (44,353) | (69,853) | $ (44,353) | (69,853) | $ (44,688) | (44,020) | $ (70,518) | $ (47,363)
Mortgage Banking Activities, Net |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Market valuations gains and losses, net | 21,058 | 9,384 | 49,335 | 24,063 |  |  |  |
Loan purchase commitments | Mortgage Banking Activities, Net |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Market valuations gains and losses, net | 13,276 | 12,021 | 33,947 | 35,508 |  |  |  |
Interest rate contract |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Notional amount | 2,650,000 |  | 2,650,000 |  |  | 2,460,000 |  |
TBAs |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Notional amount | 1,940,000 |  | 1,940,000 |  |  | 1,360,000 |  |
Futures |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Notional amount | 37,000 |  | 37,000 |  |  | $ 88,000 |  |
Unsecuritized Residential and Commercial Loans |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Derivative gain (loss) | (9,000) | (5,000) | (36,000) | (11,000) |  |  |  |
Interest rate swaps | Cash Flow Hedging |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Derivative gain (loss) | $ 300 | $ 1,000 | $ (400) | $ (23,000) |  |  |  |

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