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Loans and Leases - Collateral (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Loans and leases held for investment, net of deferred loan fees and costs | $ 84,619 | $ 69,001
Other |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Loans and leases held for investment, net of deferred loan fees and costs | 27,911 | 14,528
Mortgage Loans |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Loans and leases held for investment, net of deferred loan fees and costs | 56,708 | 54,473
Mortgage Loans | Multi-family |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Loans and leases held for investment, net of deferred loan fees and costs | 37,265 | 38,130
Mortgage Loans | Commercial real estate |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Loans and leases held for investment, net of deferred loan fees and costs | 10,470 | 8,526
Mortgage Loans | One-to-four family first mortgage |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Loans and leases held for investment, net of deferred loan fees and costs | 6,061 | 5,821
Other Loans: |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Loans and leases held for investment, net of deferred loan fees and costs | 27,911 | 14,528
Other Loans: | Commercial and industrial |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Loans and leases held for investment, net of deferred loan fees and costs | 22,065 | 10,597
Other Loans: | Other |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Loans and leases held for investment, net of deferred loan fees and costs | 2,657 | $ 2,252
Real Property | Asset pledged as collateral |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Loans and leases held for investment, net of deferred loan fees and costs | 614 |
Real Property | Mortgage Loans | Multi-family | Asset pledged as collateral |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Loans and leases held for investment, net of deferred loan fees and costs | 253 |
Real Property | Mortgage Loans | Commercial real estate | Asset pledged as collateral |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Loans and leases held for investment, net of deferred loan fees and costs | 256 |
Real Property | Mortgage Loans | One-to-four family first mortgage | Asset pledged as collateral |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Loans and leases held for investment, net of deferred loan fees and costs | 105 |
Real Property | Other Loans: | Commercial and industrial | Asset pledged as collateral |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Loans and leases held for investment, net of deferred loan fees and costs | 0 |
Other | Asset pledged as collateral |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Loans and leases held for investment, net of deferred loan fees and costs | 120 |
Other | Mortgage Loans | Multi-family | Asset pledged as collateral |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Loans and leases held for investment, net of deferred loan fees and costs | 0 |
Other | Mortgage Loans | Commercial real estate | Asset pledged as collateral |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Loans and leases held for investment, net of deferred loan fees and costs | 0 |
Other | Mortgage Loans | One-to-four family first mortgage | Asset pledged as collateral |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Loans and leases held for investment, net of deferred loan fees and costs | 0 |
Other | Other Loans: | Commercial and industrial | Asset pledged as collateral |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Loans and leases held for investment, net of deferred loan fees and costs | $ 120 |

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