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Derivative Financial Instruments - Additional Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022 | Mar. 31, 2023 | Dec. 31, 2022 | Mar. 31, 2022 | Dec. 31, 2021
Derivative [Line Items] |  |  |  |  |  |  |  |
Notional amount | $ 1,674,369 |  | $ 1,674,369 |  |  | $ 1,772,298 |  |
Accumulated other comprehensive income (loss) | 1,124,138 | $ 1,258,091 | 1,124,138 | $ 1,258,091 | $ 1,137,680 | 1,083,985 | $ 1,445,266 | $ 1,386,087
Interest Rate Agreements Accounted for as Cash Flow Hedges |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Accumulated other comprehensive income (loss) | (70,256) | (74,383) | (70,256) | (74,383) | $ (71,285) | (72,303) | $ (75,412) | $ (76,430)
Cash Flow Hedging | Interest Rate Agreements Accounted for as Cash Flow Hedges |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Accumulated other comprehensive income (loss) | (70,000) |  | (70,000) |  |  | (72,000) |  |
Interest Expense | Cash Flow Hedging |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Expected amortization of realized losses related to terminated cash flow hedges |  |  | 4,000 |  |  |  |  |
Mortgage Banking Activities, Net |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Market valuations gains (losses), net | 9,849 | (46,590) | 21,956 | (45,297) |  |  |  |
Loan purchase commitments and forward sales commitments | Mortgage Banking Activities, Net |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Market valuations gains (losses), net | 2,000 | (9,000) | 2,000 | (51,000) |  |  |  |
Interest Rate Swap And Swaptions |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Notional amount | 190,000 |  | 190,000 |  |  |  |  |
TBAs |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Notional amount | 940,000 |  | 940,000 |  |  | 1,070,000 |  |
Interest rate futures |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Notional amount | 193,000 |  | 193,000 |  |  | 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) | (2,000) | (1,000) | (2,000) |  |  |  |
Unsecuritized Residential and Commercial Loans |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Derivative gain (loss) | $ 13,000 | $ 30,000 | $ (4,000) | $ 122,000 |  |  |  |

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