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Securities Securities - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Mar. 31, 2022 | Mar. 31, 2020 | Sep. 30, 2018 | 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 | $ 201,400 |  |  |  |  |
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 262,762 |  |  |  |  | $ 258,224
Debt Securities, Available-for-sale, Unrealized Loss Position | 3,246,667 |  |  |  |  | $ 3,265,473
Sales | 0 | $ 0 |  |  |  |
Securities pledged as collateral |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Financial Instruments, Owned, at Fair Value | 2,000,000 |  |  |  |  |
Securities pledged as collateral |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Secured borrowing under agreement to repurchase | $ 201,400 |  |  |  |  |

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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in unrealized loss position without allowance for credit loss. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 55 -Paragraph 8 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479081/326-30-55-8 Reference 2: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (a)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-6 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (a)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479106/326-30-50-4 + Details
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