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v3.24.1.u1

Investment Securities - Narrative (Details) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2024 USD ($) | Mar. 31, 2023 USD ($) bond | Jun. 30, 2022 USD ($) | Sep. 30, 2021 USD ($) | Dec. 31, 2023 USD ($)
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Debt securities, available-for-sale, transfer to held-to-maturity |  |  | $ 1,990,000,000 | $ 500,800,000 |
Debt securities, held-to-maturity transfer, unrealized loss | $ 121,900,000 |  |  |  |
Available-for-sale, transfer to held-to-maturity, gain (loss) | 0 |  |  |  |
Held to maturity mortgage backed securities | 3,710,472,000 |  |  |  | $ 3,729,502,000
Available for sale mortgage backed securities | 3,394,971,000 |  |  |  | 3,509,709,000
Held-to-maturity, interest receivable | 25,600,000 |  |  |  |
Available-for-sale, interest receivable | 17,400,000 |  |  |  |
Available-for-sale securities | 3,027,558,000 |  |  |  | 3,152,153,000
Securities valued at less than historical cost, amount | $ 2,973,613,000 |  |  |  |
Securities valued at less than historical cost (as percent) | 98.20% |  |  |  |
Provision for credit loss expense | $ 0 | $ 12,800,000 |  |  |
Securities charged-off |  | 7,000,000 |  |  |
Securities pledged as collateral | 2,910,000,000 |  |  |  | 3,320,000,000
Realized gains | 0 | 0 |  |  |
Realized losses | $ 0 | $ 0 |  |  |
Income tax benefit related to security gains (losses) (as percent) | 26.135% | 26.135% |  |  |
Commercial Mortgage Backed Securities |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Held to maturity mortgage backed securities | $ 140,600,000 |  |  |  | 141,600,000
Available for sale mortgage backed securities | 665,100,000 |  |  |  | 710,100,000
Residential Mortgage Backed Securities |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Held to maturity mortgage backed securities | 1,000,000,000 |  |  |  | 1,020,000,000.00
Available for sale mortgage backed securities | $ 1,180,000,000 |  |  |  | $ 1,230,000,000
Bonds |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Number of uncollectible bonds | bond |  | 1 |  |  |

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