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Derivative Financial Instruments - Additional Information (Details) - USD ($) | 3 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Mar. 31, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Mar. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Derivative [Line Items] |  |  |  |  |  |  |  |
Notional amount | $ 6,499,482,000 |  |  | $ 6,499,482,000 |  |  | $ 11,346,407,000 |
Accumulated other comprehensive income (loss) | 1,295,142,000 | $ 936,576,000 | $ 725,202,000 | 1,295,142,000 | $ 936,576,000 | $ 1,215,575,000 | 1,110,899,000 | $ 1,827,231,000
Interest Rate Agreements Accounted for as Cash Flow Hedges |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Accumulated other comprehensive income (loss) | (78,511,000) | (82,637,000) | (83,666,000) | (78,511,000) | (82,637,000) | $ (79,539,000) | (80,557,000) | $ (50,939,000)
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 | 45,759,000 | (1,443,000) |  | 121,321,000 | (38,446,000) |  |  |
Loan purchase commitments and forward sales commitments | Mortgage Banking Activities, Net |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Market valuations gains (losses), net | 53,000,000 | 1,000,000 |  | 300,000 | 22,000,000 |  |  |
Interest rate contract |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Notional amount | 2,320,000,000 |  |  | 2,320,000,000 |  |  | 1,630,000,000 |
TBAs |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Notional amount | 1,460,000,000 |  |  | 1,460,000,000 |  |  | $ 6,630,000,000 |
Interest rate futures |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Notional amount | 222,000,000 |  |  | 222,000,000 |  |  |  |
Unsecuritized Residential and Commercial Loans |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Derivative gain (loss) | (58,000,000) | 0 |  | 35,000,000 | (98,000,000) |  |  |
Interest rate swaps | Cash Flow Hedging |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Derivative gain (loss) | $ 0 | $ 0 |  | $ 0 | $ (33,000,000) |  |  |
Derivative, cost of hedge |  |  | $ 84,000,000 |  |  |  |  |

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