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Investment Securities - Textual (Details) - USD ($) | 3 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Jun. 30, 2021 | Dec. 31, 2020 | Jun. 30, 2020 | Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |  |
Debt securities, available-for-sale, transfer to held-to-maturity | $ 500,800,000 |  |  |  |  |  |  |
Amortization of securities transferred from available for sale to held to maturity | 1,106,000 | $ 0 | $ 1,106,000 | $ 0 |  |  |  |
Available-for-sale, transfer to held-to-maturity, gain (loss) | 0 |  |  |  |  |  |  |
Held to maturity mortgage backed securities | 1,518,076,000 |  | 1,518,076,000 |  |  | $ 335,946,000 |  |
Available for sale mortgage backed securities | 6,838,743,000 |  | 6,838,743,000 |  |  | 3,397,043,000 |  |
Held-to-maturity, interest receivable | 8,300,000 |  | 8,300,000 |  |  |  |  |
Available-for-sale, interest receivable | 20,900,000 |  | 20,900,000 |  |  |  |  |
Available-for-sale securities | 6,822,203,000 |  | 6,822,203,000 |  |  | 3,473,598,000 |  |
Securities valued at less than historical cost, amount | $ 3,840,900,000 |  | $ 3,840,900,000 |  |  |  |  |
Securities valued at less than historical cost (as percent) | 56.30% |  | 56.30% |  |  |  |  |
Decrease in available-for-sale provision for credit losses | $ 0 | 602,000 | $ (312,000) | 836,000 |  |  |  |
Provision for credit losses |  | 599,000 |  | 835,000 |  |  |  |
Allowance for credit losses on HTM | 1,279,000 | 373,000 | 1,279,000 | 373,000 | $ 1,132,000 | 2,915,000 | $ 307,000 | $ 0
Securities pledged as collateral | 3,690,000,000 |  | 3,690,000,000 |  |  | 2,010,000,000.00 |  |
Realized gains | 5,300,000 | 22,300,000 | 15,900,000 | 54,800,000 |  |  |  |
Realized losses | (24,500) | (1,700) | (63,600) | $ 4,400 |  |  |  |
Investments sold, amount |  | 1,700,000,000 | $ 342,600,000 |  |  |  |  |
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 | 5,400,000 |  | $ 5,400,000 |  |  | 7,700,000 |  |
Available for sale mortgage backed securities | 1,560,000,000 |  | 1,560,000,000 |  |  | 406,100,000 |  |
Residential Mortgage Backed Securities |  |  |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |  |
Held to maturity mortgage backed securities | 52,500,000 |  | 52,500,000 |  |  | 14,700,000 |  |
Available for sale mortgage backed securities | 2,860,000,000 |  | 2,860,000,000 |  |  | 988,800,000 |  |
State and political subdivisions |  |  |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |  |
Held to maturity mortgage backed securities | 1,210,287,000 |  | 1,210,287,000 |  |  | 312,416,000 |  |
Available for sale mortgage backed securities | 1,574,674,000 |  | 1,574,674,000 |  |  | 1,416,136,000 |  |
Available-for-sale securities | 1,575,208,000 |  | 1,575,208,000 |  |  | 1,470,723,000 |  |
Securities valued at less than historical cost, amount | 992,492,000 |  | 992,492,000 |  |  |  |  |
Allowance for credit losses on HTM | 1,196,000 | $ 73,000 | 1,196,000 | $ 73,000 | $ 871,000 | $ 2,307,000 | $ 95,000 | $ 0
State and political subdivisions | Other Credit Enhancement or Insurance |  |  |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |  |
Held to maturity mortgage backed securities | 531,863,000 |  | 531,863,000 |  |  |  |  |
Allowance for credit losses on HTM | $ 0 |  | $ 0 |  |  |  |  |

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- Definition This item represents the aggregate fair value of investments in debt and equity securities in an unrealized loss position which are categorized as held-to-maturity or available-for-sale as a percentage of the total held-to-maturity and available-for-sale investment portfolio. + References No definition available. + Details
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