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Derivative Financial Instruments - Additional Information (Details) $ in Thousands | 3 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2018 USD ($) counterparty | Sep. 30, 2017 USD ($) | Sep. 30, 2018 USD ($) counterparty | Sep. 30, 2017 USD ($) | Jun. 30, 2018 USD ($) | Dec. 31, 2017 USD ($) | Jun. 30, 2017 USD ($) | Dec. 31, 2016 USD ($)
Derivative [Line Items] |  |  |  |  |  |  |  |
Notional amount | $ 6,645,489 |  | $ 6,645,489 |  |  | $ 6,644,081 |  |
Net unrealized gain (loss) on interest rate agreements | 4,801 | $ 321 | 16,649 | $ (375) |  |  |  |
Accumulated other comprehensive income | $ 1,361,327 | 1,208,640 | $ 1,361,327 | 1,208,640 |  | 1,212,287 |  | $ 1,149,428
Number of counterparties | counterparty | 2 |  | 2 |  |  |  |  |
Net Unrealized Losses on Interest Rate Agreements Accounted for as Cash Flow Hedges |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Accumulated other comprehensive income | $ (26,304) | (44,353) | $ (26,304) | (44,353) | $ (31,105) | (42,953) | $ (44,688) | $ (44,020)
Derivative Liabilities |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Notional amount | 1,656,136 |  | 1,656,136 |  |  | 3,485,466 |  |
Mortgage Banking Activities, Net |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Market valuations gains and losses, net | 10,911 | 21,058 | 46,663 | 49,335 |  |  |  |
Loan purchase commitments | Mortgage Banking Activities, Net |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Market valuations gains and losses, net | 1,610 | 13,276 | (8,116) | 33,947 |  |  |  |
Interest rate contract |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Notional amount | 3,700,000 |  | 3,700,000 |  |  | 3,210,000 |  |
TBAs |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Notional amount | 1,980,000 |  | 1,980,000 |  |  | 1,700,000 |  |
TBAs | Derivative Liabilities |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Notional amount | 500,000 |  | 500,000 |  |  | 1,400,000 |  |
Futures |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Notional amount | 15,000 |  | 15,000 |  |  | 8,000 |  |
Unsecuritized Residential and Commercial Loans |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Derivative gain (loss) | 25,000 | (9,000) | 114,000 | (36,000) |  |  |  |
Interest rate swaps | Cash Flow Hedging |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Derivative gain (loss) | 5,000 | $ 300 |  |  |  |  |  |
Net unrealized gain (loss) on interest rate agreements |  |  | 17,000 | $ (400) |  |  |  |
Interest rate swaps | Derivative Liabilities |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Notional amount | 565,500 |  | 565,500 |  |  | 1,248,000 |  |
Interest rate swaps | Derivative Liabilities | Cash Flow Hedging |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Notional amount | $ 139,500 |  | $ 139,500 |  |  | $ 139,500 |  |

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