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Investment Securities - Textual (Details) - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Held to maturity mortgage backed securities | $ 932,484,000 |  | $ 932,484,000 |  | $ 335,946,000
Available for sale mortgage backed securities | 6,543,022,000 |  | 6,543,022,000 |  | 3,397,043,000
Held-to-maturity, interest receivable | 4,200,000 |  | 4,200,000 |  |
Available-for-sale, interest receivable | 21,800,000 |  | 21,800,000 |  |
Available-for-sale securities | 6,556,581,000 |  | 6,556,581,000 |  | 3,473,598,000
Securities valued at less than historical cost, amount | $ 3,183,965,000 |  | $ 3,183,965,000 |  |
Securities valued at less than historical cost (as percent) | 48.60% |  | 48.60% |  |
Decrease in available-for-sale provision for credit losses | $ (2,454,000) | $ 340,000 | $ (312,000) | $ 236,000 |
Securities pledged as collateral | 3,890,000,000 |  | 3,890,000,000 |  | 2,010,000,000.00
Realized gains | 5,200,000 | 391,000 | 10,600,000 | 32,500,000 |
Realized losses | 26,000 | (1,000) | 39,000 | $ (2,600) |
Investments sold, amount |  | $ 1,200,000,000 | $ 249,500,000 |  |
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 | 6,100,000 |  | $ 6,100,000 |  | 7,700,000
Available for sale mortgage backed securities | 1,340,000,000 |  | 1,340,000,000 |  | 406,100,000
Residential Mortgage Backed Securities |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Held to maturity mortgage backed securities | 54,500,000 |  | 54,500,000 |  | 14,700,000
Available for sale mortgage backed securities | $ 2,650,000,000 |  | $ 2,650,000,000 |  | $ 988,800,000

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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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- Definition Amortized cost excluding accrued interest, before allowance for credit loss, of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=124258926&loc=SL82898722-210454 + Details
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