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v3.23.2

Investment Securities - Narrative (Details) | 3 Months Ended | 6 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2023 USD ($) | Jun. 30, 2022 USD ($) | Sep. 30, 2021 USD ($) | Jun. 30, 2023 USD ($) bond | Jun. 30, 2022 USD ($) | Mar. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Mar. 31, 2022 USD ($) | Dec. 31, 2021 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 |  |  |  | $ 136,000,000 |  |  |  |  |
Available-for-sale, transfer to held-to-maturity, gain (loss) |  |  |  | 0 |  |  |  |  |
Held to maturity mortgage backed securities | $ 3,759,968,000 |  |  | 3,759,968,000 |  |  | $ 3,761,094,000 |  |
Available for sale mortgage backed securities | 4,012,265,000 |  |  | 4,012,265,000 |  |  | 4,331,413,000 |  |
Held-to-maturity, interest receivable | 20,700,000 |  |  | 20,700,000 |  |  |  |  |
Available-for-sale, interest receivable | 16,600,000 |  |  | 16,600,000 |  |  |  |  |
Available-for-sale securities | 3,579,758,000 |  |  | 3,579,758,000 |  |  | 3,852,854,000 |  |
Securities valued at less than historical cost, amount | $ 3,532,270,000 |  |  | $ 3,532,270,000 |  |  |  |  |
Securities valued at less than historical cost (as percent) | 98.70% |  |  | 98.70% |  |  |  |  |
Securities - AFS, expense (reversal) | $ (1,326,000) | 0 |  | $ 11,474,000 | $ 0 |  |  |  |
Securities charged-off | 0 |  |  | $ 7,000,000 |  |  |  |  |
Number of uncollectible bonds | bond |  |  |  | 1 |  |  |  |  |
Available-for-sale, net of allowance for credit losses | 2,396,000 |  |  | $ 2,396,000 |  | $ 5,800,000 | 0 |  |
Number of nonperforming bonds | bond |  |  |  | 2 |  |  |  |  |
Held-to-maturity, allowance for credit losses | 3,214,000 | 1,381,000 |  | $ 3,214,000 | 1,381,000 | 1,888,000 | 1,388,000 | $ 1,377,000 | $ 1,279,000
Securities pledged as collateral | 3,750,000,000 |  |  | 3,750,000,000 |  |  | 3,960,000,000 |  |
Realized gains | 0 | 0 |  | 0 | 37,000 |  |  |  |
Realized losses | 391,000 | 150,000 |  | $ 391,000 | $ 240,000 |  |  |  |
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 | 144,900,000 |  |  | $ 144,900,000 |  |  | 149,200,000 |  |
Available for sale mortgage backed securities | 898,200,000 |  |  | 898,200,000 |  |  | 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 |  |  | 1,050,000,000.00 |  |  | 1,040,000,000.00 |  |
Available for sale mortgage backed securities | 1,380,000,000 |  |  | 1,380,000,000 |  |  | 1,470,000,000 |  |
State and political subdivisions |  |  |  |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |  |  |
Held to maturity mortgage backed securities | 1,859,956,000 |  |  | 1,859,956,000 |  |  | 1,861,102,000 |  |
Available for sale mortgage backed securities | 1,029,164,000 |  |  | 1,029,164,000 |  |  | 1,056,124,000 |  |
Available-for-sale securities | 885,505,000 |  |  | 885,505,000 |  |  | 871,074,000 |  |
Securities valued at less than historical cost, amount | 863,343,000 |  |  | 863,343,000 |  |  |  |  |
Securities charged-off | 0 |  |  | 0 |  |  |  |  |
Available-for-sale, net of allowance for credit losses | 0 |  |  | 0 |  | 0 | 0 |  |
Held-to-maturity, allowance for credit losses | 934,000 | $ 103,000 |  | 934,000 | $ 103,000 | $ 362,000 | $ 110,000 | $ 1,285,000 | $ 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 | $ 987,971,000 |  |  | $ 987,971,000 |  |  |  |  |

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