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Securities Securities - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Mar. 31, 2022 | Mar. 31, 2020 | Sep. 30, 2018 | Jun. 30, 2024 | Jun. 30, 2023 | Dec. 31, 2023
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |  |
Available-for-sale securities transferred to Held-to-Maturity |  |  | $ 1,100,000 | $ 873,600 | $ 179,800 |  |  |
Unrealized after tax gain (loss) on available for sale securities transferred to the held to maturity portfolio |  |  | $ 1,500 | $ 69,000 | $ (2,200) |  |  |
Secured borrowing under agreement to repurchase | $ 220,900 |  |  |  |  | $ 220,900 |  |
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 213,796 |  |  |  |  | 213,796 |  | $ 258,224
Debt Securities, Available-for-sale, Unrealized Loss Position | 3,851,579 |  |  |  |  | 3,851,579 |  | $ 3,265,473
Sales |  |  |  |  |  | 822,741 | $ 173,477 |
Debt Securities, Available-for-Sale, Realized Gain | 86 | $ 13 |  |  |  |  |  |
Debt Securities, Available-for-sale, Realized Loss |  |  |  |  |  | 72,200 | $ 10,000 |
Securities pledged as collateral |  |  |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |  |
Financial Instruments, Owned, at Fair Value | 2,500,000 |  |  |  |  | 2,500,000 |  |
Securities pledged as collateral |  |  |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |  |
Secured borrowing under agreement to repurchase | $ 220,900 |  |  |  |  | $ 220,900 |  |

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- Definition The amount of available-for-sale securities transferred to the held-to-maturity portfolio during the period, a non-cash item. + References No definition available. + Details
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- Definition Amount of realized gain on 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 -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 9 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-9 + Details
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