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v3.23.1

Investment Securities - Narrative (Details) - USD ($) | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2023 | Jun. 30, 2022 | Mar. 31, 2022 | Sep. 30, 2021 | Dec. 31, 2022 | Dec. 31, 2021
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 | $ 141,000,000 |  |  |  |  |
Available-for-sale, transfer to held-to-maturity, gain (loss) | 0 |  |  |  |  |
Held to maturity mortgage backed securities | 3,767,371,000 |  |  |  | $ 3,761,094,000 |
Available for sale mortgage backed securities | 4,186,431,000 |  |  |  | 4,331,413,000 |
Held-to-maturity, interest receivable | 17,400,000 |  |  |  |  |
Available-for-sale, interest receivable | 16,700,000 |  |  |  |  |
Available-for-sale securities | 3,755,956,000 |  |  |  | 3,852,854,000 |
Securities valued at less than historical cost, amount | $ 3,682,848,000 |  |  |  |  |
Securities valued at less than historical cost (as percent) | 98.10% |  |  |  |  |
Securities - AFS | $ 12,800,000 |  | $ 0 |  |  |
Held-to-maturity, allowance for credit losses | 1,888,000 |  | 1,377,000 |  | 1,388,000 | $ 1,279,000
Securities pledged as collateral | 3,820,000,000 |  |  |  | 3,960,000,000 |
Realized gains | 0 |  | 37,000 |  |  |
Realized losses | $ 0 |  | $ 91,000 |  |  |
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 | $ 146,500,000 |  |  |  | 149,200,000 |
Available for sale mortgage backed securities | 985,700,000 |  |  |  | 1,070,000,000.00 |
Residential Mortgage Backed Securities |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Held to maturity mortgage backed securities | 1,050,000,000.00 |  |  |  | 1,040,000,000.00 |
Available for sale mortgage backed securities | 1,450,000,000 |  |  |  | 1,470,000,000 |
State and political subdivisions |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Held to maturity mortgage backed securities | 1,860,332,000 |  |  |  | 1,861,102,000 |
Available for sale mortgage backed securities | 1,060,198,000 |  |  |  | 1,056,124,000 |
Available-for-sale securities | 895,896,000 |  |  |  | 871,074,000 |
Securities valued at less than historical cost, amount | 861,619,000 |  |  |  |  |
Held-to-maturity, allowance for credit losses | 362,000 |  | $ 1,285,000 |  | $ 110,000 | $ 1,197,000
State and political subdivisions | Other Credit Enhancement or Insurance |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Held to maturity mortgage backed securities | 987,246,000 |  |  |  |  |
Held-to-maturity, allowance for credit losses | $ 0 |  |  |  |  |

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