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v3.22.1

Investment Securities - Textual (Details) - USD ($) | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2022 | Mar. 31, 2021 | Dec. 31, 2021 | Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Debt securities, available-for-sale, transfer to held-to-maturity | $ 500,800,000 |  |  |
Net unrealized gains on securities transferred from available-for-sale to held-to-maturity during the period | 918,000 |  |  |
Available-for-sale, transfer to held-to-maturity, gain (loss) | 0 |  |  |
Held to maturity mortgage backed securities | 1,558,202,000 |  | $ 1,530,500,000 |
Available for sale mortgage backed securities | 7,070,582,000 |  | 7,130,861,000 |
Held-to-maturity, interest receivable | 7,900,000 |  |  |
Available-for-sale, interest receivable | 23,100,000 |  |  |
Available-for-sale securities | 6,640,069,000 |  | 7,113,545,000 |
Securities valued at less than historical cost, amount | $ 5,690,610,000 |  |  |
Securities valued at less than historical cost (as percent) | 85.70% |  |  |
Decrease in available-for-sale provision for credit losses | $ 0 | $ 2,142,000 |  |
Allowance for credit losses on HTM | 1,377,000 | 1,618,000 | 1,279,000 | $ 2,915,000
Securities pledged as collateral | 3,660,000,000 |  | 3,880,000,000 |
Realized gains | 37,000 | 5,500,000 |  |
Realized losses | $ (91,000) | $ 13,000 |  |
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 | $ 4,400,000 |  | 4,900,000 |
Available for sale mortgage backed securities | 1,460,000,000 |  | 1,530,000,000 |
Residential Mortgage Backed Securities |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Held to maturity mortgage backed securities | 108,100,000 |  | 65,500,000 |
Available for sale mortgage backed securities | 2,700,000,000 |  | 2,920,000,000 |
State and political subdivisions |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Held to maturity mortgage backed securities | 1,195,744,000 |  | 1,210,248,000 |
Available for sale mortgage backed securities | 1,812,534,000 |  | 1,791,097,000 |
Available-for-sale securities | 1,653,694,000 |  | 1,819,658,000 |
Securities valued at less than historical cost, amount | 1,489,958,000 |  |  |
Allowance for credit losses on HTM | 1,285,000 | $ 1,042,000 | $ 1,197,000 | $ 2,307,000
State and political subdivisions | Other Credit Enhancement or Insurance |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Held to maturity mortgage backed securities | 538,760,000 |  |  |
Allowance for credit losses on HTM | $ 0 |  |  |

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