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Derivative Financial Instruments - Additional Information (Details) - USD ($) | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2022 | Mar. 31, 2021 | Dec. 31, 2021 | Dec. 31, 2020
Derivative [Line Items] |  |  |  |
Notional amount | $ 9,842,443,000 |  | $ 6,861,921,000 |
Accumulated other comprehensive income (loss) | 1,445,266,000 | $ 1,215,575,000 | 1,386,087,000 | $ 1,110,899,000
Interest Rate Agreements Accounted for as Cash Flow Hedges |  |  |  |
Derivative [Line Items] |  |  |  |
Accumulated other comprehensive income (loss) | (75,412,000) | (79,539,000) | (76,430,000) | $ (80,557,000)
Cash Flow Hedging | Interest Rate Agreements Accounted for as Cash Flow Hedges |  |  |  |
Derivative [Line Items] |  |  |  |
Accumulated other comprehensive income (loss) | (75,000,000) |  | (76,000,000) |
Interest Expense | Cash Flow Hedging |  |  |  |
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 | 1,293,000 | 75,562,000 |  |
Loan purchase commitments and forward sales commitments | Mortgage Banking Activities, Net |  |  |  |
Derivative [Line Items] |  |  |  |
Market valuations gains (losses), net | (42,000,000) | (52,000,000) |  |
Interest Rate Swap And Swaptions |  |  |  |
Derivative [Line Items] |  |  |  |
Notional amount | 526,000,000 |  |  |
TBAs |  |  |  |
Derivative [Line Items] |  |  |  |
Notional amount | 7,940,000,000 |  | 3,310,000,000 |
Interest rate futures |  |  |  |
Derivative [Line Items] |  |  |  |
Notional amount | 281,000,000 |  | 72,000,000 |
Interest rate contract |  |  |  |
Derivative [Line Items] |  |  |  |
Notional amount | 381,000,000 |  | $ 2,100,000,000 |
Unsecuritized Residential and Commercial Loans |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative gain (loss) | $ 92,000,000 | $ 93,000,000 |  |

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