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Derivative Financial Instruments - Additional Information (Details) - USD ($) | 3 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2020 | Mar. 31, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Jun. 30, 2020 | Dec. 31, 2019 | Jun. 30, 2019 | Dec. 31, 2018
Derivative [Line Items] |  |  |  |  |  |  |  |  |
Notional amount | $ 2,575,858,000 |  |  | $ 2,575,858,000 |  |  | $ 13,589,356,000 |  |
Accumulated other comprehensive income (loss) | 1,053,464,000 |  | $ 1,785,059,000 | 1,053,464,000 | $ 1,785,059,000 | $ 936,576,000 | 1,827,231,000 | $ 1,564,032,000 | $ 1,348,794,000
Interest Rate Agreements Accounted for as Cash Flow Hedges |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |
Accumulated other comprehensive income (loss) | (81,597,000) |  | (61,175,000) | (81,597,000) | (61,175,000) | $ (82,637,000) | (50,939,000) | $ (49,384,000) | $ (34,045,000)
Interest Expense |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |
Cash flow hedge gain (loss) to be reclassified over the next 12 months |  |  |  | (4,000,000) |  |  |  |  |
Mortgage Banking Activities, Net |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |
Market valuations gains (losses), net | 56,619,000 |  | 6,205,000 | 18,173,000 | 33,625,000 |  |  |  |
Loan purchase commitments and forward sales commitments | Mortgage Banking Activities, Net |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |
Market valuations gains (losses), net | 14,000,000 |  | 14,000,000 | 35,000,000 | 42,000,000 |  |  |  |
Interest rate contract |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |
Notional amount | 335,000,000 |  |  | 335,000,000 |  |  | 4,780,000,000 |  |
TBAs |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |
Notional amount | 245,000,000 |  |  | 245,000,000 |  |  | 6,610,000,000 |  |
Interest rate futures |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |
Notional amount | 40,000,000 |  |  | 40,000,000 |  |  | $ 226,000,000 |  |
Unsecuritized Residential and Commercial Loans |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |
Derivative gain (loss) | 0 |  | (36,000,000) | (98,000,000) | (147,000,000) |  |  |  |
Interest rate swaps | Cash Flow Hedging |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |
Derivative gain (loss) | $ 0 |  | $ (12,000,000) | $ (33,000,000) | $ (27,000,000) |  |  |  |
Derivative, cost of hedge |  | $ 84,000,000 |  |  |  |  |  |  |

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