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Derivative Financial Instruments - Additional Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | Jun. 30, 2023 | Dec. 31, 2022 | Jun. 30, 2022 | Dec. 31, 2021
Derivative [Line Items] |  |  |  |  |  |  |  |
Notional amount | $ 3,273,707 |  | $ 3,273,707 |  |  | $ 1,772,298 |  |
Accumulated other comprehensive loss | 1,105,799 | $ 1,154,242 | 1,105,799 | $ 1,154,242 | $ 1,124,138 | 1,083,985 | $ 1,258,091 | $ 1,386,087
Interest Rate Agreements Accounted for as Cash Flow Hedges |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Accumulated other comprehensive loss | (69,216) | (73,343) | (69,216) | (73,343) | $ (70,256) | (72,303) | $ (74,383) | $ (76,430)
Cash Flow Hedging | Interest Rate Agreements Accounted for as Cash Flow Hedges |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Accumulated other comprehensive loss | (69,000) |  | (69,000) |  |  | (72,000) |  |
Interest Expense | Cash Flow Hedging |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Expected amortization of realized losses related to terminated cash flow hedges |  |  | 4,000 |  |  |  |  |
Loan purchase commitments and forward sales commitments |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Market valuations gains (losses), net | 6,000 | (3,000) | 8,000 | (54,000) |  |  |  |
Interest Rate Swap And Swaptions |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Notional amount | 190,000 |  | 190,000 |  |  |  |  |
TBAs |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Notional amount | 2,000,000 |  | 2,000,000 |  |  | 1,070,000 |  |
Interest rate futures |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Notional amount | 204,000 |  | 204,000 |  |  | 411,000 |  |
Interest rate contract |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Notional amount |  |  |  |  |  | $ 285,000 |  |
Interest rate contract | Cash Flow Hedging |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Realized net losses from accumulated comprehensive loss into Interest expense | (1,000) | (3,000) | (1,000) | (3,000) |  |  |  |
Unsecuritized Residential and Commercial Loans |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Derivative gains | $ 23,000 | $ 76,000 | $ 18,000 | $ 198,000 |  |  |  |

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