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v3.23.3

Investment Securities - Narrative (Details) | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2023 USD ($) | Sep. 30, 2022 USD ($) | Jun. 30, 2022 USD ($) | Sep. 30, 2021 USD ($) | Sep. 30, 2023 USD ($) bond | Sep. 30, 2022 USD ($) | Jun. 30, 2023 USD ($) | Dec. 31, 2022 USD ($)
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 |  |  |  |  | $ 131,200,000 |  |  |
Available-for-sale, transfer to held-to-maturity, gain (loss) |  |  |  |  | 0 |  |  |
Held to maturity mortgage backed securities | $ 3,745,506,000 |  |  |  | 3,745,506,000 |  |  | $ 3,761,094,000
Available for sale mortgage backed securities | 3,890,910,000 |  |  |  | 3,890,910,000 |  |  | 4,331,413,000
Held-to-maturity, interest receivable | 17,500,000 |  |  |  | 17,500,000 |  |  |
Available-for-sale, interest receivable | 18,600,000 |  |  |  | 18,600,000 |  |  |
Available-for-sale securities | 3,358,421,000 |  |  |  | 3,358,421,000 |  |  | 3,852,854,000
Securities valued at less than historical cost, amount | $ 3,328,182,000 |  |  |  | $ 3,328,182,000 |  |  |
Securities valued at less than historical cost (as percent) | 99.10% |  |  |  | 99.10% |  |  |
Securities - AFS, expense |  |  |  |  | $ 10,300,000 |  |  |
Securities - AFS, reversal | $ 1,200,000 |  |  |  |  |  |  |
Securities charged-off |  |  |  |  | $ 7,000,000 |  |  |
Number of uncollectible bonds | bond |  |  |  |  | 1 |  |  |
Available-for-sale, net of allowance for credit losses | 1,196,000 |  |  |  | $ 1,196,000 |  | $ 2,396,000 | 0
Number of nonperforming bonds | bond |  |  |  |  | 2 |  |  |
Securities pledged as collateral | 3,380,000,000 |  |  |  | $ 3,380,000,000 |  |  | 3,960,000,000
Realized gains | 0 | $ 8,000 |  |  | 0 | $ 45,000 |  |
Realized losses | 0 | $ 30,000 |  |  | $ 391,000 | $ 271,000 |  |
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 | 143,100,000 |  |  |  | $ 143,100,000 |  |  | 149,200,000
Available for sale mortgage backed securities | 859,900,000 |  |  |  | 859,900,000 |  |  | 1,070,000,000.00
Residential Mortgage Backed Securities |  |  |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |  |
Held to maturity mortgage backed securities | 1,040,000,000.00 |  |  |  | 1,040,000,000.00 |  |  | 1,040,000,000.00
Available for sale mortgage backed securities | $ 1,300,000,000 |  |  |  | $ 1,300,000,000 |  |  | $ 1,470,000,000

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