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Investment Securities - Narrative (Details) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2024 USD ($) | Sep. 30, 2023 USD ($) | Jun. 30, 2022 USD ($) | Sep. 30, 2021 USD ($) | Sep. 30, 2024 USD ($) | Sep. 30, 2023 USD ($) bond | 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 |  |  |  |  | $ 112,700,000 |  |
Available-for-sale, transfer to held-to-maturity, gain (loss) |  |  |  |  | 0 |  |
Held to maturity mortgage backed securities | $ 3,661,914,000 |  |  |  | 3,661,914,000 |  | $ 3,729,502,000
Available for sale mortgage backed securities | 2,976,811,000 |  |  |  | 2,976,811,000 |  | 3,509,709,000
Held-to-maturity, interest receivable | 17,300,000 |  |  |  | 17,300,000 |  |
Available-for-sale, interest receivable | 24,600,000 |  |  |  | 24,600,000 |  |
Available-for-sale securities | 2,691,094,000 |  |  |  | 2,691,094,000 |  | 3,152,153,000
Securities valued at less than historical cost, amount | $ 2,613,507,000 |  |  |  | $ 2,613,507,000 |  |
Securities valued at less than historical cost (as percent) | 97.10% |  |  |  | 97.10% |  |
Provision for credit losses, AFS securities | $ 0 |  |  |  | $ 0 |  |
Net decrease in allowance on previously impaired securities |  | $ 1,200,000 |  |  |  | $ 2,526,000 |
Securities charged-off |  |  |  |  |  | 7,000,000 |
Securities pledged as collateral | 2,490,000,000 |  |  |  | 2,490,000,000 |  | 3,320,000,000
Realized gains | 0 | 0 |  |  | 0 | 0 |
Realized losses | 28,400,000 | 0 |  |  | $ 28,400,000 | $ 391,000 |
Investments sold, amount | 251,500,000 |  |  |  |  |  |
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 | 137,200,000 |  |  |  | $ 137,200,000 |  | 141,600,000
Available for sale mortgage backed securities | 571,900,000 |  |  |  | 571,900,000 |  | 710,100,000
Residential Mortgage Backed Securities |  |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |
Held to maturity mortgage backed securities | 955,900,000 |  |  |  | 955,900,000 |  | 1,020,000,000.00
Available for sale mortgage backed securities | 938,500,000 |  |  |  | 938,500,000 |  | 1,230,000,000
Bonds |  |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |
Number of uncollectible bonds | bond |  |  |  |  |  | 1 |
Other securities |  |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |
Held to maturity mortgage backed securities | 256,155,000 |  |  |  | 256,155,000 |  | 256,007,000
Available for sale mortgage backed securities | 239,053,000 |  |  |  | 239,053,000 |  | 259,165,000
Available-for-sale securities | 222,827,000 |  |  |  | 222,827,000 |  | $ 234,297,000
Securities valued at less than historical cost, amount | $ 175,596,000 |  |  |  | $ 175,596,000 |  |
Net decrease in allowance on previously impaired securities |  | $ 1,200,000 |  |  |  | $ 2,526,000 |
Securities charged-off |  |  |  |  |  | $ 7,000,000 |

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