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Derivative Financial Instruments - Additional Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021 | Mar. 31, 2022 | Dec. 31, 2021 | Mar. 31, 2021 | Dec. 31, 2020
Derivative [Line Items] |  |  |  |  |  |  |  |
Notional amount | $ 3,025,270 |  | $ 3,025,270 |  |  | $ 6,861,921 |  |
Accumulated other comprehensive income (loss) | 1,258,091 | $ 1,295,142 | 1,258,091 | $ 1,295,142 | $ 1,445,266 | 1,386,087 | $ 1,215,575 | $ 1,110,899
Interest Rate Agreements Accounted for as Cash Flow Hedges |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Accumulated other comprehensive income (loss) | (74,383) | (78,511) | (74,383) | (78,511) | $ (75,412) | (76,430) | $ (79,539) | $ (80,557)
Cash Flow Hedging | Interest Rate Agreements Accounted for as Cash Flow Hedges |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Accumulated other comprehensive income (loss) | (74,000) |  | (74,000) |  |  | (76,000) |  |
Interest Expense | Cash Flow Hedging |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Cash flow hedge loss to be reclassified over the next 12 months |  |  | 4,000 |  |  |  |  |
Mortgage Banking Activities, Net |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Market valuations gains (losses), net | (46,590) | 45,759 | (45,297) | 121,321 |  |  |  |
Loan purchase commitments and forward sales commitments | Mortgage Banking Activities, Net |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Market valuations gains (losses), net | (9,000) |  | (51,000) |  |  |  |  |
Interest Rate Swap And Swaptions |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Notional amount | 1,490,000 |  | 1,490,000 |  |  |  |  |
TBAs |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Notional amount | 860,000 |  | 860,000 |  |  | 3,310,000 |  |
Interest rate futures |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Notional amount | 389,000 |  | 389,000 |  |  | 72,000 |  |
Interest rate contract |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Notional amount | 468,000 |  | 468,000 |  |  | $ 2,100,000 |  |
Unsecuritized Residential and Commercial Loans |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Derivative gain (loss) | $ 30,000 | $ (58,000) | $ 122,000 | $ 35,000 |  |  |  |

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