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Investment Securities - Narrative (Details) - USD ($) |  | 12 Months Ended |
--- | --- | --- | ---
Jun. 01, 2022 | Dec. 31, 2024 | Dec. 31, 2023
Investments, Debt and Equity Securities [Abstract] |  |  |
FRB and FHLB stock, at cost |  | $ 147,773,000 | $ 126,346,000
OCI, Debt Securities, Available-for-Sale, Transfer from Held-to-Maturity, Gain (Loss), before Adjustment and Tax | $ 218,300,000 | (157,900,000) |
Net Investment Income [Line Items] |  |  |
OCI, Debt Securities, Available-for-Sale, Transfer from Held-to-Maturity, Gain (Loss), before Adjustment and Tax | (218,300,000) | 157,900,000 |
FRB and FHLB stock, at cost |  | 147,773,000 | 126,346,000
Debt Securities, Available-for-Sale, Allowance for Credit Loss |  | 0 | 199,000
Corporate Debt Securities [Member] |  |  |
Net Investment Income [Line Items] |  |  |
Debt Securities, Available-for-Sale, Allowance for Credit Loss |  | 0 | $ 199,000
Available-for-sale Securities |  |  |
Investments, Debt and Equity Securities [Abstract] |  |  |
Available For Sale Securities Pledged As Collateral Amortized Cost |  | 4,200,000 |
Net Investment Income [Line Items] |  |  |
Available For Sale Securities Pledged As Collateral Amortized Cost |  | 4,200,000 |
Held-to-maturity Securities |  |  |
Net Investment Income [Line Items] |  |  |
Transfer to Investments | $ 2,300,000,000 |  |
Debt Securities, Held-to-Maturity, Restricted |  | 2,200,000,000 |
Asset Pledged as Collateral |  |  |
Net Investment Income [Line Items] |  |  |
Debt Securities, Held-to-Maturity, Restricted |  | $ 2,100,000,000 |

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